Power assist unit and vehicle

Abstract

A power assist unit (100) and a vehicle using the power assist unit (100). The power assist unit comprises a power output shaft (12), a power input shaft (14), a speed regulation power device (16) and a power assist power device (18). The power output shaft (12) is used for outputting power. The power input shaft (14) is used for receiving a power input of a power input device (26) and transmitting the power to the power output shaft (12). The speed regulation power device (16) is connected to the power output shaft (12) by means of a first transmission mechanism (20), and is used for regulating the rotation speed of the power output shaft (12). The power assist power device (18) is connected to the first transmission mechanism (20) by means of a second transmission mechanism (22), and is used for providing assistance for the power output shaft (12). When relevant information of power to be outputted by the speed regulation power device (16) exceeds a preset limit value, the power assist power device (18) can drive, by means of a compensation transmission mechanism (24), the speed regulation power device (16) to rotate.

Description

Assist unit and vehicle Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to a power assist unit and a vehicle. Background Technology

[0002] In related technologies, for electric-assist bicycles, when the user pedals hard, causing the assist unit to output a large torque, the speed-regulating power device needs to generate a large torque. At this time, because the motor output of the speed-regulating power device is saturated, it cannot output a larger torque, which will cause the user's pedal feel to become soft and the experience to be poor. Summary of the Invention

[0003] In a first aspect, embodiments of this application provide an assisting unit, the assisting unit comprising:

[0004] The power take-off shaft is used to output power.

[0005] A power input shaft is used to receive power input from a power input device and transmit power to the power output shaft.

[0006] A speed-regulating power device, connected to the power output shaft via a first transmission mechanism, is used to adjust the rotational speed of the power output shaft; and

[0007] The power assist device, connected to the first transmission mechanism via a second transmission mechanism, is used to provide assistance to the power output shaft.

[0008] The power assist device is connected to the speed regulating device via a compensation transmission mechanism.

[0009] When the relevant information of the power to be output by the speed regulating power device exceeds a preset limit, the assist power device can drive the speed regulating power device to rotate through the compensation transmission mechanism.

[0010] In the aforementioned power assist unit, the power assist device can drive the speed regulating power device to rotate through the compensation transmission mechanism, thereby compensating for the insufficient output of the speed regulating power device and improving or eliminating the problem of soft pedal feel.

[0011] In some embodiments, the relevant information of the power to be output by the speed regulating power device includes at least one of the following: the magnitude of the torque to be output by the speed regulating power device, the magnitude of the power to be output by the speed regulating power device, and the magnitude of the energy to be supplied by the speed regulating power device.

[0012] In some embodiments, the amount of energy to be supplied by the speed-regulating power device includes at least one of the following: the amount of current to be supplied by the speed-regulating power device.

[0013] In some embodiments, the information related to the output power of the speed regulating power device exceeding a preset limit includes at least one of the following:

[0014] The output torque of the speed regulating power device is greater than the preset torque limit.

[0015] The output power of the speed regulating power device is greater than the preset power limit.

[0016] The current to be supplied to the speed regulating power device is greater than the preset current limit.

[0017] In some embodiments, the operating modes of the power assist unit include a shifting mode and a fixed-gear mode. When the power assist device drives the speed regulating device to rotate through the compensation transmission mechanism, the power assist unit is in the fixed-gear mode; when the transmission connection between the power assist device and the speed regulating device is disconnected, the power assist unit is in the shifting mode.

[0018] In some implementations, in response to the assist unit meeting preset conditions, the assist unit switches from the fixed gear mode to the variable gear mode.

[0019] In some embodiments, the response to the assist unit satisfying a preset condition includes: the response to the operating state of the speed regulating power device satisfying a preset condition.

[0020] In some embodiments, the response to the operating state of the speed regulating power device satisfying a preset condition includes at least one of the following: the output torque of the speed regulating power device is less than or equal to a preset torque value, and the rotational speed of the speed regulating power device is greater than or equal to a preset speed value.

[0021] In some embodiments, the assist unit further includes a switching device for connecting or disconnecting the transmission connection between the assist power device and the speed regulating power device via the compensation transmission mechanism.

[0022] In some embodiments, the switching device includes a clutch that automatically disconnects the transmission connection between the power assist unit and the speed regulating power unit via the compensation transmission mechanism in response to the power assist unit meeting a preset condition.

[0023] In some implementations, the clutch includes a one-way bearing.

[0024] In some embodiments, the one-way bearing is connected to the output shaft of the speed regulating power device, and the compensation transmission mechanism is connected to the power input shaft through the one-way bearing.

[0025] In some embodiments, when the power assist unit is in the fixed gear mode, the transmission ratio of the power input to the power output of the power assist unit is a constant value.

[0026] In some embodiments, when the power assist unit is in the shifting mode, the transmission ratio of the power input to the power output of the power assist unit changes with the rotational speed of the speed regulating power device.

[0027] In some embodiments, when the power assist unit is in the gear shifting mode, the gear of the power assist unit increases as the rotational speed of the speed regulating power device increases.

[0028] In some embodiments, the compensation transmission mechanism includes at least one of the following: a mechanical transmission mechanism, a hydraulic transmission mechanism, a magnetic transmission mechanism, a fluid transmission mechanism, and an electromagnetic transmission mechanism.

[0029] In some embodiments, the mechanical transmission mechanism includes at least one of the following: a gear transmission mechanism, a wheel transmission mechanism, and a worm gear transmission mechanism.

[0030] In some embodiments, the wheel drive mechanism includes two drive wheels and a connecting member, one of the drive wheels being connected to the output shaft of the speed regulating power device, and the other drive wheel being connected to the output shaft of the power assist device. The connecting member is connected to both drive wheels to drive the two drive wheels to rotate together.

[0031] In some embodiments, the drive wheel includes at least one of the following: a pulley, a sprocket;

[0032] The connector includes at least one of the following: a belt, a chain.

[0033] In some embodiments, the first transmission mechanism includes a gear transmission mechanism, the gear transmission mechanism includes a plurality of gear components, the output shaft of the speed regulating power device is connected to one of the gear components, and the power output shaft is connected to another gear component.

[0034] In some embodiments, the gear transmission mechanism includes a planetary gear transmission mechanism, which includes a sun gear, a ring gear, a planetary gear set, and a planet carrier. The sun gear is disposed within the ring gear, and the planetary gear set is disposed between the inner ring of the ring gear and the outer ring of the sun gear. The planetary gear set meshes with both the ring gear and the sun gear. The planet carrier is connected to the middle of the planetary gears in the planetary gear set, and the rotation of the planetary gears can drive the planet carrier to rotate.

[0035] In some embodiments, the planetary gear set includes multiple sets of planetary gears, one set of which meshes with the sun gear, and another set of which meshes with the ring gear.

[0036] In some embodiments, the number of teeth in one set of planetary gears may be the same as or different from the number of teeth in another set of planetary gears.

[0037] In some embodiments, the output shaft of the speed-regulating power unit is connected to the sun gear or the planet carrier.

[0038] In some embodiments, the power output shaft is connected to the planet carrier or the sun gear.

[0039] In some embodiments, the gear ring is connected to the power input shaft via a third transmission mechanism.

[0040] In some embodiments, one of the sun gear or the planetary carrier is connected to the output shaft of the speed-regulating power unit, and the other is connected to the power output shaft.

[0041] In some embodiments, the gear ring is connected to the second transmission mechanism via a fourth transmission mechanism.

[0042] In some embodiments, the second transmission mechanism includes a gear transmission mechanism comprising a plurality of gear components, the output shaft of the power assist device being connected to one of the gear components, and the first transmission mechanism being connected to the other gear component.

[0043] In some embodiments, the gear transmission mechanism includes a planetary gear transmission mechanism, which includes a sun gear, a ring gear, a planetary gear set, and a planet carrier. The sun gear is disposed within the ring gear, and the planetary gear set is disposed between the inner ring of the ring gear and the outer ring of the sun gear. The planetary gear set meshes with both the ring gear and the sun gear. The planet carrier is connected to the middle of the planetary gears in the planetary gear set, and the rotation of the planetary gears can drive the planet carrier to rotate.

[0044] In some embodiments, the planetary gear set includes multiple sets of planetary gears, one set of which meshes with the sun gear, and another set of which meshes with the ring gear.

[0045] In some embodiments, the number of teeth in one set of planetary gears may be the same as or different from the number of teeth in another set of planetary gears.

[0046] In some embodiments, the output shaft of the power assist device is connected to the sun gear or the planet carrier.

[0047] In some embodiments, the first transmission mechanism is connected to the planet carrier or the sun gear.

[0048] In some embodiments, the gear ring is fixed and does not rotate.

[0049] In some embodiments, one of the sun gear or the planetary carrier is connected to the output shaft of the power assist device, and the other is connected to the first transmission mechanism.

[0050] In some embodiments, the power assist unit further includes a third transmission mechanism, through which the power input shaft drives a component of the first transmission mechanism to rotate.

[0051] In some embodiments, the third transmission mechanism includes at least one of the following: a mechanical transmission mechanism, a hydraulic transmission mechanism, a magnetic transmission mechanism, a fluid transmission mechanism, and an electromagnetic transmission mechanism.

[0052] In some embodiments, the mechanical transmission mechanism includes at least one of the following: a gear transmission mechanism, a wheel transmission mechanism, and a worm gear transmission mechanism.

[0053] In some embodiments, the wheel transmission mechanism includes two transmission wheels and a transmission member, one of the transmission wheels being connected to the power input shaft, the other transmission wheel being connected to the first transmission mechanism, and the transmission member being connected to both transmission wheels to drive the two transmission wheels to rotate together.

[0054] In some embodiments, the drive wheel includes at least one of the following: a pulley, a sprocket;

[0055] The transmission component includes at least one of the following: a belt, a chain.

[0056] In some embodiments, the assist unit further includes a fourth transmission mechanism, through which the second transmission mechanism drives a component of the first transmission mechanism to rotate.

[0057] In some embodiments, the fourth transmission mechanism includes at least one of the following: a mechanical transmission mechanism, a hydraulic transmission mechanism, a magnetic transmission mechanism, a fluid transmission mechanism, and an electromagnetic transmission mechanism.

[0058] In some embodiments, the mechanical transmission mechanism includes at least one of the following: a gear transmission mechanism, a wheel transmission mechanism, and a worm gear transmission mechanism.

[0059] In some embodiments, the wheel transmission mechanism includes two transmission wheels and a transmission member, wherein one of the transmission wheels is connected to the second transmission mechanism, the other transmission wheel is connected to the first transmission mechanism, and the transmission member is connected to both transmission wheels to drive the two transmission wheels to rotate together.

[0060] In some embodiments, the drive wheel includes at least one of the following: a pulley, a sprocket;

[0061] The transmission component includes at least one of the following: a belt, a chain.

[0062] In some embodiments, the power input shaft further includes a clutch, wherein the power input shaft drives a component of the first transmission mechanism to rotate via a third transmission mechanism, and the clutch is used to disconnect or connect the transmission connection in which the power input shaft drives a component of the first transmission mechanism to rotate via the third transmission mechanism.

[0063] In some implementations, the clutch includes a one-way bearing.

[0064] In some embodiments, the one-way bearing is connected to the power input shaft, and the third transmission mechanism is connected to the power input shaft via the one-way bearing.

[0065] In some embodiments, when the speed of the third transmission mechanism is greater than the speed of the power input shaft, the one-way bearing disconnects the transmission connection through which the power input shaft drives a component of the first transmission mechanism to rotate.

[0066] In some embodiments, the output shaft of the power assist device is a hollow shaft, and the power input shaft passes through the output shaft of the power assist device.

[0067] In some embodiments, the output shaft of the power assist device is rotatable relative to the power input shaft.

[0068] In some embodiments, a bearing is provided between the output shaft of the power assist device and the power input shaft.

[0069] In some embodiments, the power assist device and at least some components of the second transmission mechanism are arranged along the extension direction of the power input shaft.

[0070] In some embodiments, at least some components of the second transmission mechanism are mounted on the power input shaft.

[0071] In some embodiments, the power assist device is mounted on the power input shaft.

[0072] In some embodiments, the output shaft of the power assist device is coaxially arranged with the power input shaft.

[0073] In some embodiments, the speed-regulating power unit and at least some of the components of the first transmission mechanism are arranged along the extension direction of the power output shaft.

[0074] In some embodiments, at least some components of the first transmission mechanism are fitted onto the extension of the power output shaft.

[0075] In some embodiments, the output shaft of the speed regulating power device is coaxially arranged with the power output shaft.

[0076] In some embodiments, the rotational speed of the power output shaft increases as the rotational speed of the speed regulating power device and / or the rotational speed of the power input shaft increases.

[0077] In some embodiments, the rotational speed of the speed regulating power device is adjusted according to the rotational speed of the power input shaft.

[0078] In some embodiments, the torque of the power output shaft increases as the torque of the power assist device and the torque of the power input shaft increase.

[0079] In some embodiments, the torque of the power assist device is adjusted according to the torque of the power input shaft.

[0080] In some embodiments, the power input shaft and the power output shaft are arranged at intervals in a direction perpendicular to the power output shaft.

[0081] In some embodiments, the extension direction of the power input shaft is substantially parallel to the extension direction of the power output shaft.

[0082] In some embodiments, the assist unit further includes a power input device coaxially connected to the power input shaft.

[0083] In some embodiments, the power input device includes at least one of the following: an electric motor, an engine, and a pedal crank mechanism.

[0084] In some embodiments, the power input device is fixedly connected to the power input shaft.

[0085] In some embodiments, the speed-regulating power device includes at least one of the following: an electric motor, an engine.

[0086] In some embodiments, the power assist device includes at least one of the following: an electric motor, an engine.

[0087] In some implementations, the assist unit is used on an electric-assist bicycle, an electric motorcycle, or an electric car.

[0088] Secondly, this application provides a vehicle comprising:

[0089] Power input device; and

[0090] In any of the above embodiments, the assist unit is connected to the power input device and is used to adjust the power input by the power input device.

[0091] In the aforementioned vehicles, the power assist device can drive the speed regulating power device to rotate through the compensation transmission mechanism, thereby compensating for the insufficient output of the speed regulating power device and improving or eliminating the problem of soft pedal feel.

[0092] Additional aspects and advantages of embodiments of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of embodiments of this application. Attached Figure Description

[0093] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, wherein:

[0094] Figure 1 is a schematic diagram of the assist unit according to an embodiment of this application;

[0095] Figure 2 is a schematic diagram of the architecture of the assist unit in an embodiment of this application;

[0096] Figure 3 is an exploded view of the assist unit according to an embodiment of this application;

[0097] Figure 4 is a schematic diagram of the structure of the assist unit according to an embodiment of this application;

[0098] Figure 5 is another exploded view of the assisting unit according to an embodiment of this application;

[0099] Figure 6 is a cross-sectional schematic diagram of the assist unit according to an embodiment of this application;

[0100] Figure 7 is a schematic diagram of the vehicle module according to an embodiment of this application.

[0101] Explanation of reference numerals for main components: Assist unit 100, power output shaft 12, power input shaft 14, speed regulating power device 16, assist power device 18, first transmission mechanism 20, second transmission mechanism 22, compensation transmission mechanism 24, switching device 28, one-way bearing 30, transmission wheel 32, transmission component 34, first sun gear 36, first ring gear 38, first planetary gear set 40, first planetary carrier 42, third transmission mechanism 44, fourth transmission mechanism 46, second sun gear 48, second ring gear 50, second planetary gear set 52, second planetary carrier 54, clutch 56, vehicle 10, power input device 200, driving device 300. Detailed Implementation

[0102] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0103] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0104] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a mechanical connection or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium, and they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0105] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0106] The foregoing disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described above. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0107] In a first aspect, referring to Figures 1 to 6, embodiments of this application provide an assist unit 100. The assist unit 100 includes a power output shaft 12, a power input shaft 14, a speed regulating power device 16, and an assist power device 18. The power output shaft 12 is used to output power. The power input shaft 14 is used to receive power input from the power input device 200 and transmit the power to the power output shaft 12. The speed regulating power device 16 is connected to the power output shaft 12 via a first transmission mechanism 20 and is used to regulate the rotational speed of the power output shaft 12. The assist power device 18 is connected to the first transmission mechanism 20 via a second transmission mechanism 22 and is used to provide assistance to the power output shaft 12.

[0108] The power assist device 18 is connected to the speed regulating device 16 via a compensation transmission mechanism 24. When the relevant information of the power to be output by the speed regulating device 16 exceeds a preset limit, the power assist device 18 can drive the speed regulating device 16 to rotate via the compensation transmission mechanism 24.

[0109] In the aforementioned power assist unit 100, the power assist device 18 can drive the speed regulating power device 16 to rotate through the compensation transmission mechanism 24, thereby compensating for the insufficient output of the speed regulating power device 16 and improving or eliminating the problem of soft pedal feel.

[0110] Furthermore, the power assist device 18 transmits torque to the speed regulating power device 16 through the compensation transmission mechanism 24, which can further reduce the size of the speed regulating power device 16, making the power assist unit 100 more compact and lighter.

[0111] Specifically, the power assist unit 100 is responsible for providing additional power assistance. The power output shaft 12 is used to output power, and the power output shaft 12 can be connected to the wheels so that the power drives the wheels to rotate, thereby driving the vehicle.

[0112] The power input shaft 14 is used to receive power input from the power input device 200. In some embodiments, the power input device 200 may include at least one of the following: a motor, an engine, and a pedal crank mechanism. In some embodiments, the vehicle may be an electric vehicle, including pure electric vehicles, hybrid electric vehicles, range-extended electric vehicles, etc. The electric vehicle includes a motor, and the output shaft of the motor may be connected to the power input shaft 14. When the motor is operating, it can drive the power input shaft 14 to rotate through the output shaft, thereby the power input shaft 14 receives the power input from the motor and transmits the power to the power output shaft 12, thereby driving the vehicle.

[0113] In some embodiments, the vehicle may be a gasoline-powered vehicle, including pure gasoline vehicles, hybrid vehicles, etc. The gasoline-powered vehicle includes an engine, and the engine's output shaft can be connected to the power input shaft 14. When the engine is running, the output shaft can drive the power input shaft 14 to rotate, thereby the power input shaft 14 receives the power input from the engine and transmits the power to the power output shaft 12, thus driving the vehicle.

[0114] In some embodiments, the vehicle may be an electric-assisted bicycle, which includes a pedal-crank mechanism. The pedal-crank mechanism may include a crankshaft and pedals, with the pedals connected to a power input shaft 14 via the crankshaft. When the rider pedals, the crankshaft rotates, thereby rotating the power input shaft 14. The power input shaft 14 receives the power input from the pedal-crank mechanism and transmits the power to the power output shaft 12, thus driving the vehicle.

[0115] The speed-regulating power device 16 is connected to the power output shaft 12 via the first transmission mechanism 20 and is used to regulate the rotational speed of the power output shaft 12. Specifically, when the speed-regulating power device 16 is working, it can drive the first transmission mechanism 20 to move, thereby driving the power output shaft 12 to rotate, thus regulating the rotational speed of the power output shaft 12. The transmission ratio of the first transmission mechanism 20 can be fixed or variable. In some embodiments, the speed-regulating power device 16 may include a speed-regulating motor, the speed of which is adjustable to regulate the rotational speed of the power output shaft 12. The speed-regulating power device 16 can change the speed of the power output shaft 12 through the first transmission mechanism 20.

[0116] The power assist device 18 is connected to the first transmission mechanism 20 via the second transmission mechanism 22, and is used to provide assistance to the power output shaft 12. Thus, the power assist device 18 and the power input device 200 can work together to provide greater power to the power output shaft 12, or reduce the output burden of the power input device 200 while providing a constant power to the power output shaft 12. In some embodiments, the power assist device 18 may include a power assist motor with adjustable speed to adapt to different power demands. The power assist motor can be used to compensate for insufficient power in the power input shaft 14, ensuring that the power input device 200 (e.g., manually operated) is always at a comfortable output torque. In some embodiments, the power assist device 18 can achieve deceleration via the second transmission mechanism 22.

[0117] The power assist device 18 is connected to the speed regulating device 16 via a compensation transmission mechanism 24. When the relevant information of the output power of the speed regulating device 16 exceeds a preset limit, the power assist device 18 can drive the speed regulating device 16 to rotate via the compensation transmission mechanism 24. Specifically, the compensation transmission mechanism 24 can output power from the power assist device 18 to the speed regulating device 16, thereby driving the speed regulating device 16 to rotate when the relevant information of the output power of the speed regulating device 16 exceeds the preset limit, thus compensating for the insufficient power of the speed regulating device 16. This can, to a certain extent, improve the problem of insufficient power output from the speed regulating device 16 leading to a soft pedal feel. At the same time, it also allows the speed regulating device 16 to be made smaller, enabling a compact power assist unit 100, which is beneficial for the miniaturization design of the power assist unit 100.

[0118] In related technologies, when a rider pedals an electric bicycle hard, the speed-regulating motor requires a large torque. If the speed-regulating motor's output is saturated and unable to output more torque, the internal mechanical structure may become soft, resulting in a soft pedal feel. In this embodiment, the power assist device 18 can drive the speed-regulating power device 16 to rotate via the compensation transmission mechanism 24, thereby compensating for the insufficient output of the speed-regulating power device 16 and improving or eliminating the problem of a soft pedal feel.

[0119] Optionally, in some embodiments, the preset limit may include, but is not limited to, the limit of the speed regulating power device 16 in the rated power operating state, the limit preset by the manufacturer of the assist unit 100, the limit set by the user, etc.

[0120] In some embodiments, the relevant information of the power to be output by the speed regulating power device 16 includes at least one of the following: the magnitude of the torque to be output by the speed regulating power device 16, the magnitude of the power to be output by the speed regulating power device 16, and the magnitude of the energy to be supplied by the speed regulating power device 16.

[0121] Therefore, the speed-regulating power unit 16 can be adapted to more application scenarios.

[0122] Specifically, in some embodiments, the relevant information of the power to be output by the speed regulating power device 16 includes the magnitude of the torque to be output by the speed regulating power device 16, the magnitude of the power to be output by the speed regulating power device 16, or the magnitude of the energy to be supplied by the speed regulating power device 16.

[0123] For example, when the output torque of the speed-regulating power unit 16 exceeds a preset torque limit, the assist power unit 18 can drive the speed-regulating power unit 16 to rotate via the compensation transmission mechanism 24. When the output power of the speed-regulating power unit 16 exceeds a preset power limit, the assist power unit 18 can drive the speed-regulating power unit 16 to rotate via the compensation transmission mechanism 24. When the energy to be supplied to the speed-regulating power unit 16 exceeds a preset energy supply limit, the assist power unit 18 can drive the speed-regulating power unit 16 to rotate via the compensation transmission mechanism 24.

[0124] In some embodiments, the relevant information of the power to be output by the speed regulating power device 16 includes any one or any two of the following: the magnitude of the torque to be output by the speed regulating power device 16, the magnitude of the power to be output by the speed regulating power device 16, and the magnitude of the energy to be supplied by the speed regulating power device 16.

[0125] In some embodiments, the amount of power to be supplied to the speed regulating power device 16 includes the amount of current to be supplied to the speed regulating power device 16.

[0126] Therefore, when the current exceeds the preset limit, the power assist device 18 can drive the speed regulating power device 16 to rotate through the compensation transmission mechanism 24.

[0127] Specifically, the current to be supplied can be determined based on the torque required to be output by the speed regulating power unit 16. When the current to be supplied exceeds the preset limit, it indicates that the speed regulating power unit 16 cannot meet the required torque output. Therefore, the power assist unit 18 can drive the speed regulating power unit 16 to rotate through the compensation transmission mechanism 24 to compensate for the speed regulating power unit 16's inability to output greater torque due to power saturation, thus improving the problem of soft pedal feel.

[0128] Furthermore, the power assist device 18 transmits torque to the speed regulating power device 16 through the compensation transmission mechanism 24, which can further reduce the size of the speed regulating power device 16, making the power assist unit 100 more compact and lighter.

[0129] In some embodiments, the information related to the output power of the speed regulating power unit 16 exceeding a preset limit includes at least one of the following:

[0130] The output torque of the speed regulating power device 16 is greater than the preset torque limit.

[0131] The output power of the speed regulating power device 16 is greater than the preset power limit;

[0132] The current to be supplied to the speed regulating power unit 16 is greater than the preset current limit.

[0133] Therefore, it can be determined that the power assist device 18 drives the speed regulating device 16 to rotate through the compensation transmission mechanism 24.

[0134] Specifically, in some embodiments, the information related to the power to be output by the speed regulating power device 16 exceeding the preset limit includes: the torque to be output by the speed regulating power device 16 being greater than the preset torque limit; the power to be output by the speed regulating power device 16 being greater than the preset power limit; and the current to be supplied by the speed regulating power device 16 being greater than the preset current limit.

[0135] The preset torque limit, preset power limit, and preset current limit can be preset and stored in the power assist unit 100 or the vehicle, and can be specifically determined through methods including but not limited to simulation, testing, and empirical values. The torque to be output can be the torque determined based on the torque required to be output by the speed regulating power unit 16. The power to be output can be the power determined based on the torque required to be output by the speed regulating power unit 16. The current to be supplied can be the current determined based on the torque required to be output by the speed regulating power unit 16.

[0136] During the operation of the power assist unit 100, when any one of the following occurs: the output torque of the speed regulating power device 16 is greater than the preset torque limit, the output power of the speed regulating power device 16 is greater than the preset power limit, or the current supplied by the speed regulating power device 16 is greater than the preset current limit, the power assist device 18 can drive the speed regulating power device 16 to rotate through the compensation transmission mechanism 24, so that the power assist unit 100 can meet the torque requirements of the power input shaft 14, thereby improving the problem of soft pedal feel.

[0137] Furthermore, the power assist device 18 transmits torque to the speed regulating power device 16 through the compensation transmission mechanism 24, which can further reduce the size of the speed regulating power device 16, making the power assist unit 100 more compact and lighter.

[0138] In some embodiments, the information related to the power to be output by the speed regulating power device 16 exceeding the preset limit includes any one or any two of the following: the torque to be output by the speed regulating power device 16 is greater than the preset torque limit; the power to be output by the speed regulating power device 16 is greater than the preset power limit; the current to be supplied by the speed regulating power device 16 is greater than the preset current limit.

[0139] The preset torque limit, preset power limit, and preset current limit can be determined specifically based on requirements, performance, and other factors, and this application does not impose any restrictions on them.

[0140] In some embodiments, the power assist unit 100 operates in a shifting mode and / or a fixed-gear mode. When the power assist device 18 drives the speed regulating device 16 to rotate via the compensating transmission mechanism 24, the power assist unit 100 is in a fixed-gear mode. When the transmission connection between the power assist device 18 and the speed regulating device 16 via the compensating transmission mechanism 24 is disconnected, the power assist unit 100 is in a shifting mode.

[0141] This eliminates the feeling of softness and jerking caused by sudden gear shifts during mode switching.

[0142] Furthermore, the power assist device 18 transmits torque to the speed regulating power device 16 through the compensation transmission mechanism 24, which can further reduce the size of the speed regulating power device 16, making the power assist unit 100 more compact and lighter.

[0143] Specifically, in some embodiments, the speed-regulating power device 16 may include a speed-regulating motor, and the assist power device 18 may include an assist motor, wherein the maximum torque requirements of the speed-regulating motor and the assist motor occur at off-peak times.

[0144] In some implementations, the fixed-gear mode can be a mode where the transmission ratio of the power assist unit 100 is fixed, for example, a mode where the input-to-output speed ratio is fixed. Optionally, in the fixed-gear mode, the torque of the speed-regulating motor is the rated torque or the maximum torque. The torque is related to the speed of the speed-regulating motor; that is, in the fixed-gear mode, the speed of the speed-regulating motor is constant. When the output torque of the speed-regulating motor exceeds the preset torque limit, for example, when the output of the speed-regulating motor is insufficient, it indicates that the speed-regulating motor cannot meet the torque requirement of the power output shaft 12. The power assist device 18 can drive the speed-regulating motor to rotate through the compensation transmission mechanism 24, thereby transmitting the torque of the power assist motor to the speed-regulating motor through the compensation transmission mechanism 24, and to a certain extent eliminating the soft feeling caused by the sudden change in gear during mode switching.

[0145] In some implementations, the shifting mode can be a mode in which the transmission ratio of the power assist unit 100 is variable, for example, a mode in which the input-to-output speed ratio is variable. Optionally, in the shifting mode, the torque of the speed-regulating motor can be continuously variable. The torque is related to the speed of the speed-regulating motor, that is, in the shifting mode, the speed of the speed-regulating motor is continuously variable to achieve stepless speed change, which can eliminate the jerking sensation caused by sudden gear changes during mode switching to a certain extent. When the transmission connection between the power assist device 18 and the speed-regulating motor via the compensation transmission mechanism 24 is disconnected, the power assist unit 100 can be in the shifting mode, and the speed of the speed-regulating motor can adapt to the torque requirements of the power output shaft 12, without the need for the power assist device 18 to drive the speed-regulating motor via the compensation transmission mechanism 24.

[0146] The power assist unit 100 of this embodiment integrates a gear shifting function, forming an ECVT (Electrically Controlled Continuously Variable Transmission), eliminating the jerky feeling of stepped gear shifts. It also eliminates the need for a rear derailleur and multi-stage freewheel, saving weight and cost, and increasing compactness. Furthermore, the power assist device 18 can transmit torque to the speed regulating device 16 through the compensation transmission mechanism 24, allowing for further reduction in the size of the speed regulating device 16, making the power assist unit 100 more compact and lighter.

[0147] In some implementations, in response to the assist unit 100 meeting preset conditions, the assist unit 100 switches from a fixed gear mode to a variable gear mode.

[0148] This allows the power assist unit 100 to switch from fixed gear mode to variable gear mode.

[0149] Specifically, in the illustrated embodiment, when the power assist device 18 drives the speed regulating device 16 to rotate via the compensation transmission mechanism 24, the power assist unit 100 is in a fixed gear mode. In the fixed gear mode, the power assist device 18 can drive the speed regulating device 16 to rotate via the compensation transmission mechanism 24 to compensate for insufficient output of the speed regulating device 16.

[0150] In response to the power assist unit 100 meeting preset conditions, the transmission connection between the power assist device 18 and the speed regulating power device 16 via the compensation transmission mechanism 24 is disconnected, so that the power assist unit 100 switches from fixed gear mode to variable gear mode. In variable gear mode, the torque of the speed regulating power device 16 can be continuously changed to adapt to the torque requirements of the power assist unit 100.

[0151] In some implementations, responding to the assist unit 100 meeting preset conditions includes responding to the operating state of the speed regulating power device 16 meeting preset conditions.

[0152] Therefore, when the working state of the speed regulating power device 16 meets the preset conditions, the power assist unit 100 can switch from the fixed gear mode to the gear shift mode.

[0153] Specifically, in some embodiments, when the relevant information of the power to be output by the speed regulating power device 16 exceeds a preset limit, such as when the output of the speed regulating power device 16 is insufficient, the working mode of the assist unit 100 is a fixed gear mode, and the assist power device 18 can drive the speed regulating power device 16 to rotate through the compensation transmission mechanism 24.

[0154] When the relevant information of the output power of the speed regulating power unit 16 does not exceed the preset limit, it can be determined that the working state of the speed regulating power unit 16 meets the preset conditions. In response to the working state of the speed regulating power unit 16 meeting the preset conditions, the assist unit 100 switches from fixed gear mode to variable gear mode.

[0155] In some embodiments, the response to the operating state of the speed regulating power device 16 satisfying preset conditions includes at least one of the following: the output torque of the speed regulating power device 16 is less than or equal to a preset torque value, and the rotational speed of the speed regulating power device 16 is greater than or equal to a preset speed value.

[0156] Therefore, the working state of the speed regulating power device 16 can be determined according to the output torque and speed of the speed regulating power device 16, thereby realizing the switching between the fixed gear mode and the gear changing mode of the power assist unit 100.

[0157] Specifically, in some embodiments, the speed regulating power device 16 includes a speed regulating motor, the output torque of the speed regulating power device 16 can be the output torque of the speed regulating motor, and the rotational speed of the speed regulating power device 16 can be the rotational speed of the speed regulating motor.

[0158] In some embodiments, the response to the operating state of the speed regulating power unit 16 satisfying preset conditions includes: the output torque of the speed regulating power unit 16 being less than or equal to a preset torque value, and the rotational speed of the speed regulating power unit 16 being greater than or equal to a preset speed value. When the operating state of the speed regulating power unit 16 satisfies either of the above two conditions, it can be determined that the operating state of the speed regulating power unit 16 satisfies the preset conditions. In response to the operating state of the speed regulating power unit 16 satisfying the preset conditions, the power assist unit 100 switches from a fixed-gear mode to a shift-gear mode.

[0159] In some embodiments, the response to the operating state of the speed regulating power device 16 satisfying preset conditions includes: the output torque of the speed regulating power device 16 being less than or equal to a preset torque value, or the rotational speed of the speed regulating power device 16 being greater than or equal to a preset speed value.

[0160] The preset torque value and preset speed value can be specifically defined according to requirements, but this application does not impose such limitations.

[0161] In some embodiments, the assist unit 100 further includes a switching device 28, which is used to connect or disconnect the transmission connection between the assist power unit 18 and the speed regulating power unit 16 via the compensation transmission mechanism 24.

[0162] Therefore, the transmission between the power assist device 18 and the speed regulating device 16 can be disconnected and connected by the switching device 28.

[0163] Specifically, in the embodiments shown in Figures 2 to 6, the speed regulating power unit 16 can be connected to the compensating transmission mechanism 24 via the switching device 28. In some embodiments, the power assist unit 18 can be connected to the compensating transmission mechanism 24 via the switching device 28.

[0164] When the relevant information of the output power of the speed-regulating power unit 16 exceeds the preset limit, the switching device 28 can activate the transmission connection between the power assist unit 18 and the speed-regulating power unit 16 via the compensation transmission mechanism 24, allowing the power assist unit 100 to be in a fixed gear mode. The power assist unit 18 can drive the speed-regulating power unit 16 to rotate via the compensation transmission mechanism 24, thus eliminating the feeling of soft pedaling to a certain extent.

[0165] When the relevant information of the output power of the speed regulating power unit 16 does not exceed the preset limit, the switching device 28 can disconnect the transmission connection between the power assist unit 18 and the speed regulating power unit 16 via the compensation transmission mechanism 24, and the power assist unit 100 can be in shift mode. The power assist unit 18 cannot drive the speed regulating power unit 16 to rotate via the compensation transmission mechanism 24.

[0166] In some embodiments, the switching device 28 includes a clutch that automatically disconnects the transmission connection between the power assist unit 18 and the speed regulating power unit 16 via the compensation transmission mechanism 24 in response to the power assist unit 100 meeting preset conditions.

[0167] Therefore, the switching device 28 has a simple structure and low cost.

[0168] Specifically, in some embodiments, the clutch may include a first part and a second part. In the embodiments shown in Figures 2 to 6, the compensating transmission mechanism 24 is connected to the speed regulating power device 16 via a switching device 28, the first part may be connected to the speed regulating power device 16, and the second part may be connected to the compensating transmission mechanism 24. In some embodiments, the compensating transmission mechanism 24 is connected to the power assist device 18 via the switching device 28, the first part may be connected to the power assist device 18, and the second part may be connected to the compensating transmission mechanism 24.

[0169] The first part can be combined with and separated from the second part. When the first part is combined with the second part, the switching device 28 can conduct the transmission connection that enables the power assist device 18 to drive the speed regulating device 16 to rotate through the compensation transmission mechanism 24. When the first part is separated from the second part, the switching device 28 can disconnect the transmission connection that enables the power assist device 18 to drive the speed regulating device 16 to rotate through the compensation transmission mechanism 24.

[0170] The clutch technology is mature and the structure is simple, which can effectively reduce the cost of the switching device 28.

[0171] In some embodiments, referring to Figures 3, 5 and 6, the clutch includes a one-way bearing 30.

[0172] Therefore, the transmission connection can be disconnected and connected via the one-way bearing 30. When the power assist device 18 transmits torque to the speed regulating device 16 through the compensation transmission mechanism 24, the transmission ratio of the power assist unit 100 is fixed, and the system operates in fixed gear mode. When the vehicle speed needs to be increased, the speed regulating device 16 accelerates, the one-way bearing 30 disengages, the system enters ECVT mode, and gear shifting begins. During the switching between the two modes, the torque of the speed regulating device 16 changes continuously, and the gears change continuously, thereby eliminating the feeling of soft pedal feel and jerking.

[0173] Specifically, the one-way bearing 30 allows the shaft to rotate freely in one direction while locking or generating significant resistance in the other.

[0174] In the embodiments shown in Figures 2 to 6, the compensation transmission mechanism 24 is connected to the speed regulating power device 16 via a switching device 28. The speed regulating power device 16 includes a speed regulating motor, and the compensation transmission mechanism 24 can be connected to the output shaft of the speed regulating motor via a one-way bearing 30.

[0175] When the speed regulating power unit 16 is at a low speed, the assist power unit 18 can drive the speed regulating power unit 16 to rotate. When the speed of the speed regulating motor increases, the one-way bearing 30 can disconnect the transmission connection between the assist power unit 18 and the speed regulating power unit 16 via the compensation transmission mechanism 24, thereby causing the speed of the speed regulating power unit 16 to exceed the speed of the assist power unit 18.

[0176] In applications requiring high pedaling torque and high output torque, this typically occurs at low speeds of the speed-regulating power unit 16, such as during start-up. In this situation, the power assist unit 18 can unidirectionally output torque to the speed-regulating power unit 16 via the one-way bearing 30, but not vice versa. In some implementations, the power assist unit 18 itself does not require reverse torque compensation from the speed-regulating power unit 16, as its size and parameters are sufficient to meet the assistance requirements.

[0177] In some embodiments, the one-way bearing 30 is connected to the output shaft of the speed regulating power device 16, and the compensation transmission mechanism 24 is connected to the speed regulating power device 16 via the one-way bearing 30. Specifically, the one-way bearing 30 includes an inner ring structure and an outer ring structure that mates with the inner ring structure. The compensation transmission mechanism 24 is fixedly connected to one of the inner ring structure and the outer ring structure, and the output shaft of the speed regulating power device 16 is fixedly connected to the other of the inner ring structure and the outer ring structure. When the output shaft of the speed regulating power device 16 is connected to the inner ring structure of the one-way bearing 30, the output shaft of the speed regulating power device 16 can pass through the inner ring structure of the one-way bearing 30.

[0178] Therefore, the installation of the one-way bearing 30 is simple and efficient.

[0179] Specifically, in some embodiments, the speed-regulating power device 16 may include a speed-regulating motor, which includes an output shaft, which can be the rotating shaft for power output of the speed-regulating motor. The rotor of the speed-regulating motor is connected to the output shaft, the one-way bearing 30 is connected to the output shaft of the speed-regulating motor, and the compensation transmission mechanism 24 is connected to the speed-regulating motor through the one-way bearing 30. The one-way bearing 30 can disconnect and connect the transmission connection that enables the power-assisting device 18 to drive the speed-regulating motor to rotate through the compensation transmission mechanism 24.

[0180] In some implementations, when the power assist unit 100 is in a fixed gear mode, the transmission ratio of the power input to the power output of the power assist unit 100 is a constant value.

[0181] Therefore, it can be ensured that in fixed gear mode, the power assist unit 100 can transmit power from the input to the output at a constant value.

[0182] Specifically, the magnitude of the transmission ratio in the fixed gear mode can be determined based on factors such as the application scenario and performance requirements of the power assist unit 100. After the magnitude of the transmission ratio is determined, the parameters and structure of the transmission components of the power assist unit 100 in the power transmission process can be designed so that the magnitude of the transmission ratio between the power input and the power output of the power assist unit 100 in the fixed gear mode is a designed constant value.

[0183] In some embodiments, when the power assist unit 100 is in shift mode, the transmission ratio of the power input to the power output of the power assist unit 100 changes with the speed of the speed regulating power device 16.

[0184] Therefore, in shift mode, the transmission ratio of the power assist unit 100 can be changed by changing the speed of the speed regulating power device 16, thereby realizing the shift operation of the power assist unit 100.

[0185] Specifically, in shift mode, the mapping relationship between different speeds of the speed regulating power unit 16 and the transmission ratio of the power assist unit 100 can be pre-calibrated and stored through simulation, testing, and other methods. Each mapping relationship can correspond to a gear of the power assist unit 100 in shift mode. The power assist unit 100 can adjust the speed of the speed regulating power unit 16 according to the gear required by the vehicle, thereby obtaining the corresponding transmission ratio and realizing the transmission of power in the corresponding gear, which can effectively eliminate the jerkiness during gear shifting.

[0186] In some embodiments, when the power assist unit 100 is in shift mode, the gear of the power assist unit 100 increases as the rotational speed of the speed regulating power device 16 increases.

[0187] This can improve the user experience.

[0188] Specifically, in shift mode, the gear of the power assist unit 100 increases as the speed of the speed regulating power device 16 increases; that is, the gear of the power assist unit 100 is positively correlated with the speed of the speed regulating power device 16. When the user desires a higher gear, according to the above relationship, the power assist unit 100 controls the speed of the speed regulating power device 16 to increase, thereby obtaining the desired higher gear. When the user desires a lower gear, according to the above relationship, the power assist unit 100 controls the speed of the speed regulating power device 16 to decrease, thereby obtaining the desired lower gear. Thus, the power assist unit 100 can achieve corresponding control in a positive direction according to the user's expectations, thereby improving the user experience.

[0189] The mapping relationship between different speeds of the speed regulating power unit 16 and the transmission ratio of the assist unit 100 can be calibrated and stored through simulation, testing, etc. Each mapping relationship can correspond to a gear of the assist unit 100 in shift mode, so the assist unit 100 can obtain the target speed of the speed regulating power unit 16 according to the required gear and the above mapping relationship, and control the speed regulating power unit 16 to run at the target speed.

[0190] In some embodiments, the compensation transmission mechanism 24 includes at least one of the following: a mechanical transmission mechanism, a hydraulic transmission mechanism, a magnetic transmission mechanism, a fluid transmission mechanism, or an electromagnetic transmission mechanism.

[0191] Therefore, the structure of the compensation transmission mechanism 24 can be flexibly configured.

[0192] Specifically, in some embodiments, the compensation transmission mechanism 24 includes a mechanical transmission mechanism, a hydraulic transmission mechanism, a magnetic transmission mechanism, a hydraulic transmission mechanism, or an electromagnetic transmission mechanism. In some embodiments, the compensation transmission mechanism 24 includes any one, any two, any three, or any four of the following: a mechanical transmission mechanism, a hydraulic transmission mechanism, a magnetic transmission mechanism, a hydraulic transmission mechanism, and an electromagnetic transmission mechanism.

[0193] Mechanical transmission mechanisms can transmit power through methods including, but not limited to, friction, meshing, connecting rods, ratchet, crank-slider, and eccentric wheels. They typically consist of fewer parts, have a simple structure, and are relatively easy to manufacture and maintain. Under good lubrication and sealing conditions, mechanical transmission mechanisms achieve high transmission efficiency. They are suitable for various speed and torque transmission requirements, meeting the application needs of the power assist unit 100.

[0194] Hydraulic transmission mechanisms can use liquid as a working medium to transmit power. Specifically, a hydraulic transmission mechanism uses liquid as a working medium. A hydraulic pump can convert the power of the power assist device 18 into the pressure energy of the liquid. Then, through pipelines, hydraulic control and adjustment devices, and other means, an actuator (such as a hydraulic cylinder or hydraulic motor) is used to convert the pressure energy of the liquid back into mechanical energy, which is then output to the speed regulating power device 16, thereby driving the speed regulating power device 16 to rotate.

[0195] Magnetic transmission mechanisms utilize the principle of magnetic field interaction to achieve contactless power transmission. Specifically, magnetic transmission mechanisms use the principle of magnetic field interaction between magnets to transmit torque through the coupled field formed by magnetic lines of force. When the driving magnet (or driving magnet) rotates, the magnetic field it generates acts on the driven magnet (or driven element), causing the driven magnet to rotate accordingly, thereby achieving power transmission. Because magnetic transmission is contactless, it avoids the friction and wear problems of traditional mechanical transmissions.

[0196] Hydraulic transmission mechanisms can be transmission methods based on fluid mechanics principles, transmitting power and torque through a liquid medium. Specifically, a hydraulic transmission mechanism is a device that uses liquid as the working medium and achieves energy transfer through the kinetic energy of the liquid. When the power assist device 18 drives the input shaft of the hydraulic transmission device to rotate, the liquid in the working chamber interacts with the impellers mounted on the input shaft, output shaft, and housing, transforming the speed and torque input by the power assist device 18, which are then output through the output shaft, thereby driving the speed regulating device 16 to rotate.

[0197] An electromagnetic transmission mechanism is a mechanism that converts electromagnetic energy into mechanical energy through electromagnetic force. Specifically, an electromagnetic transmission mechanism typically includes an electromagnet, and its working principle is based on the interaction of electromagnetic induction and magnetic fields. When an energized coil generates a magnetic field, this magnetic field attracts or repels ferromagnetic materials (such as an iron core or armature), thereby achieving mechanical motion. The current in the energized coil can be determined according to the power output of the power-assisting device 18, thus converting the power of the power-assisting device 18 into the magnitude of the current. The energized coil can then convert the magnitude of the current into the magnitude of the magnetic field, thereby causing the ferromagnetic material to move accordingly and driving the speed-regulating power device 16 to rotate.

[0198] In some embodiments, the mechanical transmission mechanism includes at least one of the following: a gear transmission mechanism, a wheel transmission mechanism, and a worm gear transmission mechanism.

[0199] Therefore, mechanical transmission mechanisms have a simple structure and low cost.

[0200] Specifically, in some embodiments, the mechanical transmission mechanism includes a gear transmission mechanism, a wheel transmission mechanism, or a worm gear transmission mechanism. In some embodiments, the mechanical transmission mechanism includes any one or any two of the following: a gear transmission mechanism, a wheel transmission mechanism, and a worm gear transmission mechanism.

[0201] Gear transmission mechanisms transmit power through the meshing of two or more gears. Specifically, the working principle of a gear transmission mechanism is based on the gear ratio and module. In some embodiments, the gear transmission mechanism may include a driving gear and a driven gear. The driving gear may be connected to an assist power device 18, and the driven gear may be connected to a speed regulating power device 16. When the driving gear (also called the drive gear) rotates, its teeth mesh with the teeth of the driven gear (also called the passive gear), thereby driving the driven gear to rotate. By adjusting the gear ratio, different transmission ratios can be achieved, such as acceleration transmission, deceleration transmission, or constant speed transmission. Furthermore, the gear module determines the gear size and load-bearing capacity, thus affecting the efficiency and stability of the transmission.

[0202] Gear transmission mechanisms include, but are not limited to, spur gear transmission, helical gear transmission, herringbone gear transmission, and bevel gear transmission.

[0203] A wheel drive mechanism is a mechanism that transmits power through flexible or elastic elements (such as belts or chains). Specifically, a wheel drive mechanism may include a pulley drive mechanism, which transmits power through one or more flexible belts (such as rubber belts, belts, chains, etc.) wrapped around pulleys (also called sheaves). A pulley drive mechanism may include a driving pulley and a driven pulley. The driving pulley may be connected to an assist power device 18, and the driven pulley may be connected to a speed regulating power device 16. When the driving pulley rotates, it drives the flexible belt to move along the pulley surface, thereby driving the driven pulley and the speed regulating power device 16 to rotate.

[0204] The working principle of the worm gear transmission mechanism is based on the meshing of the helical shape of the worm with the tooth surface of the worm wheel. The worm wheel can be connected to the power assist device 18, and the worm can be connected to the speed regulating power assist device. When the worm rotates, its helical shape meshes with the tooth surface of the worm wheel, thereby producing a transmission effect. Due to the helical shape of the worm wheel tooth surface, the worm wheel can only drive the worm to rotate, thereby driving the speed regulating power device 16 to rotate, and cannot achieve reverse transmission. Therefore, the worm gear transmission mechanism has the characteristic of unidirectional transmission.

[0205] In some embodiments, the wheel drive mechanism includes two drive wheels 32 and a drive member 34. One drive wheel 32 is connected to the output shaft of the speed regulating power device 16, and the other drive wheel 32 is connected to the output shaft of the power assist device 18. The drive member 34 is connected to the two drive wheels 32 to drive the two drive wheels 32 to rotate together.

[0206] Thus, the power assist device 18 can drive the speed regulating power device 16 to rotate through the compensation transmission mechanism 24.

[0207] Specifically, of the two transmission wheels 32, one can be a driving transmission wheel 32 and the other a driven transmission wheel 32. The driving transmission wheel 32 can be connected to the output shaft of the power assist device 18, and the driven transmission wheel 32 can be connected to the output shaft of the speed regulating device 16. The transmission component 34 is connected to both the driving and driven transmission wheels 32. When the relevant information of the power to be output by the speed regulating device 16 exceeds a preset limit, the output shaft of the power assist device 18 rotates, driving the driving transmission wheel 32 to rotate. When the driving transmission wheel 32 rotates, it drives the transmission component 34 to rotate the driven transmission wheel 32. When the driven transmission wheel 32 rotates, it drives the output shaft of the speed regulating device 16 to rotate, thereby enabling the power assist device 18 to drive the speed regulating device 16 to rotate through the compensation transmission mechanism 24.

[0208] In some embodiments, the drive wheel 32 includes at least one of the following: a pulley, a sprocket;

[0209] The transmission component 34 includes at least one of the following: a belt, a chain.

[0210] Therefore, the wheel transmission mechanism has a simple structure and is easy to assemble.

[0211] Specifically, in some embodiments, the drive wheel 32 includes a pulley, and the drive member 34 includes a belt connected to two pulleys to drive the two pulleys to rotate together. In some embodiments, the drive wheel 32 includes a sprocket, and the drive member 34 includes a chain connected to two sprockets to drive the two sprockets to rotate together. In some embodiments, the drive wheel 32 includes both a pulley and a sprocket, and the drive member 34 includes both a belt and a chain. The belt is connected to the two pulleys to drive them to rotate together, and the chain is connected to the two sprockets to drive them to rotate together.

[0212] During assembly, wrap the belt around the outer circumference of the pulley and tighten it to prevent slippage. Alternatively, wrap the chain around the outer circumference of the sprocket and tighten it to prevent slippage, thus improving assembly efficiency.

[0213] In some embodiments, the first transmission mechanism 20 includes a gear transmission mechanism, which includes multiple gear components. The output shaft of the speed regulating power device 16 is connected to one of the gear components, and the power output shaft 12 is connected to another gear component.

[0214] Therefore, the power assist unit 100 can be connected to the speed regulating power device 16 and the power output shaft 12 through the gear transmission mechanism, which has high transmission efficiency and can bear a large rotational torque.

[0215] Specifically, the toothed component may include, but is not limited to, gears, gear rings, and other toothed components. The teeth of two toothed components mesh with each other, so that when one toothed component rotates, it can drive the other toothed component to rotate, thereby realizing power transmission.

[0216] Of the two gear components, one can be a driving gear component and the other a driven gear component. The driving gear component can be connected to the output shaft of the speed regulating power device 16, and the driven gear component can be connected to the power output shaft 12. When the speed regulating power device 16 drives the driving gear component to rotate, the driving gear component can drive the driven gear component to rotate, thereby driving the power output shaft 12 to rotate, thus realizing the transmission of power.

[0217] In some embodiments, the gear transmission mechanism includes a planetary gear transmission mechanism. The planetary gear transmission mechanism includes a sun gear, a ring gear, a planetary gear set, and a planet carrier. The sun gear is located within the ring gear. The planetary gear set is located between the inner ring of the ring gear and the outer ring of the sun gear, and meshes with both the ring gear and the sun gear. The planet carrier is connected to the middle of the planetary gears in the planetary gear set. Rotation of the planetary gears drives the planet carrier to rotate.

[0218] Therefore, the power of the speed regulating power device 16 can be transmitted to the power output shaft 12 through the planetary gear transmission mechanism, which has high transmission efficiency and can bear a large torque.

[0219] Specifically, for ease of explanation, please refer to Figures 2 to 6. The sun gear, ring gear, planetary gear set, and planetary carrier of the first transmission mechanism 20 are respectively the first sun gear 36, the first ring gear 38, the first planetary gear set 40, and the first planetary carrier 42. In some embodiments, the speed-regulating power device 16 includes a speed-regulating motor. In the embodiments shown in Figures 2 to 6, the first sun gear 36 is connected to the output shaft of the speed-regulating motor, and the first planetary carrier 42 is connected to the power output shaft 12.

[0220] When the speed-regulating motor is working, it can drive the first sun gear 36 to rotate, which in turn drives the first planetary gear set 40 and the first planetary carrier 42 to rotate, thereby driving the power output shaft 12 to rotate. This enables the power of the speed-regulating motor to be transmitted to the power output shaft 12, thus performing stepless speed regulation on the power output shaft 12.

[0221] Since the first sun gear 36 and the first planetary gear set 40 are connected by meshing teeth, efficient power transmission and high torque transmission can be achieved.

[0222] The first planetary gear set 40 may include at least one planetary gear. In the embodiments shown in Figures 2 to 6, the first planetary gear set 40 may include multiple planetary gears, such as two, three, or more than three.

[0223] In some embodiments, the planetary gear set includes multiple sets of planetary gears, one set of which meshes with the sun gear and another set of which meshes with the ring gear.

[0224] Therefore, power can be transmitted through multiple sets of planetary gears.

[0225] Specifically, in some embodiments, the planetary gear set includes two sets of planetary gears that mesh with each other. One set of planetary gears meshes with the first sun gear 36, and the other set meshes with the first ring gear 38. Both sets of planetary gears can be connected to the first planetary carrier 42. When the speed-regulating motor is working, it can drive the first sun gear 36 to rotate, which in turn drives the meshed planetary gear set to rotate. This planetary gear set then drives the other planetary gear set and the first planetary carrier 42 to rotate, thereby driving the power output shaft 12 to rotate, thus transmitting power from the speed-regulating motor to the power output shaft 12.

[0226] In some embodiments, the planetary gear set includes two or more sets of planetary gears, which mesh in pairs. One planetary gear set meshes with the first sun gear 36, another planetary gear set meshes with the first ring gear 38, and other planetary gear sets mesh with either the first sun gear 36 or the first ring gear 38, serving as intermediate transmission components. The planetary gear set meshing with the first ring gear 38 can be connected to the first planet carrier 42. When the speed-regulating motor is operating, it drives the first sun gear 36 to rotate, which in turn drives one of its meshing planetary gear sets to rotate. The remaining planetary gear sets and the first planet carrier 42 then rotate, thereby driving the power output shaft 12 to rotate, thus transmitting power from the speed-regulating motor to the power output shaft 12.

[0227] In some implementations, the number of teeth in one set of planetary gears may be the same as or different from the number of teeth in another set of planetary gears.

[0228] Therefore, the number of teeth in the planetary gear set can be configured according to different application scenarios.

[0229] Specifically, in some implementations, one set of planetary gears has the same number of teeth as the other set, achieving a 1:1 transmission ratio. This allows the two sets of planetary gears to change only their rotational direction, without altering their speed or torque.

[0230] In some implementations, the number of teeth on one set of planetary gears differs from that on the other, achieving a transmission ratio other than 1:1. Specifically, the transmission ratio is equal to the inverse ratio of the number of teeth on the two sets of planetary gears. For example, if the planetary gears on the power input side have 8 teeth and the planetary gears on the power output side have 24 teeth, then their transmission ratio is 3:1, meaning the speed on the power output side is 1 / 3 of the speed on the power input side, and the torque on the power output side is 3 times the torque on the power input side. Conversely, if the planetary gears on the power input side have 24 teeth and the planetary gears on the power output side have 8 teeth, then their transmission ratio is 1:3, the speed on the power output side is 3 times the speed on the power input side, and the torque on the power output side is 1 / 3 of the torque on the power input side.

[0231] When a reduction in rotational speed is needed, a planetary gear with more teeth can be selected as the output gear, and a planetary gear with fewer teeth as the input gear. Conversely, when an increase in rotational speed is needed, a planetary gear with fewer teeth can be selected as the output gear, and a planetary gear with more teeth as the input gear. In addition to changes in rotational speed, torque will also change accordingly. During deceleration, torque will increase; during acceleration, torque will decrease.

[0232] In some embodiments, the output shaft of the speed regulating power unit 16 is connected to the sun gear or planetary carrier.

[0233] Thus, the power output from the speed regulating power unit 16 can be input to the planetary gear transmission mechanism through the sun gear or planet carrier.

[0234] Specifically, in some embodiments, the speed-regulating power unit 16 includes a speed-regulating motor. In the embodiments shown in Figures 2 to 6, the output shaft of the speed-regulating motor is connected to a first sun gear 36, thereby allowing the power output from the speed-regulating motor to be input into the planetary gear transmission mechanism via the first sun gear 36. The first planet carrier 42 can be connected to the power output shaft 12.

[0235] When the speed-regulating motor is working, it can drive the first sun gear 36 to rotate, which in turn drives the first planetary gear set 40 and the first planetary carrier 42 to rotate, thereby driving the power output shaft 12 to rotate, thus realizing the power transmission of the speed-regulating motor to the power output shaft 12.

[0236] In some embodiments, the output shaft of the speed-regulating motor is connected to the first planetary carrier 42, thereby allowing the power output from the speed-regulating motor to be input into the planetary gear transmission mechanism via the first planetary carrier 42. The first sun gear 36 may be connected to the power output shaft 12.

[0237] When the speed-regulating motor is working, it can drive the first planetary carrier 42 to rotate, which in turn drives the first planetary gear set 40 and the first sun gear 36 to rotate, thereby driving the power output shaft 12 to rotate, thus realizing the power transmission of the speed-regulating motor to the power output shaft 12.

[0238] In some implementations, the power take-off shaft 12 is connected to a planetary carrier or a sun gear.

[0239] Thus, the power transmitted by the planetary gear transmission mechanism can be transmitted to the power output shaft 12 via the planet carrier or the sun gear.

[0240] Specifically, the speed-regulating power unit 16 includes a speed-regulating motor. In the embodiments shown in Figures 2 to 6, the power output shaft 12 is connected to the first planetary carrier 42, so that the power transmitted by the planetary gear transmission mechanism can be output to the power output shaft 12 through the first planetary carrier 42. The output shaft of the speed-regulating motor can be connected to the first sun gear 36.

[0241] When the speed-regulating motor is working, it can drive the first sun gear 36 to rotate, which in turn drives the first planetary gear set 40 and the first planetary carrier 42 to rotate, thereby driving the power output shaft 12 to rotate, thus realizing the power transmission of the speed-regulating motor to the power output shaft 12.

[0242] In some embodiments, the power output shaft 12 is connected to the first sun gear 36, thereby allowing the power transmitted by the planetary gear transmission mechanism to be output to the power output shaft 12 via the first sun gear 36. The output shaft of the speed-regulating motor may be connected to the first planetary carrier 42.

[0243] When the speed-regulating motor is working, it can drive the first planetary carrier 42 to rotate, which in turn drives the first planetary gear set 40 and the first sun gear 36 to rotate, thereby driving the power output shaft 12 to rotate, thus realizing the power transmission of the speed-regulating motor to the power output shaft 12.

[0244] In some embodiments, the gear ring is connected to the power input shaft 14 via a third transmission mechanism 44.

[0245] Therefore, when the power assist device 18 is working, the power input shaft 14 and the power assist device 18 can jointly drive the power output shaft 12 to rotate. When the power assist device 18 is not working, the power input shaft 14 can drive the power output shaft 12 to rotate independently.

[0246] Specifically, the power assist device 18 can be connected to the power output shaft 12 via the second transmission mechanism 22 and the first transmission mechanism 20, and to the power input shaft 14 via the second transmission mechanism 22, the first transmission mechanism 20, and the third transmission mechanism 44. The first gear ring 38 is connected to the power input shaft 14 via the third transmission mechanism 44. When the power input shaft 14 receives power input from the power input device 200, the power input shaft 14 can transmit power to the first gear ring 38 via the third transmission mechanism 44, thereby driving the first gear ring 38 to rotate.

[0247] The first gear ring 38 can be connected to the first planetary carrier 42 via the first planetary gear set 40. The first planetary carrier 42 is connected to the power output shaft 12, so that the first gear ring 38 can drive the power output shaft 12 to rotate, and the power input from the power input shaft 14 is transmitted to the power output shaft 12 via the third transmission mechanism 44 and the first transmission mechanism 20.

[0248] In the embodiments shown in Figures 2 to 6, the power assist device 18 is connected to the first gear ring 38 through the second transmission mechanism 22. When the power assist device 18 is working, it can drive the first gear ring 38 to rotate through the second transmission mechanism 22. Thus, the power input by the power input device 200 and the assistance provided by the power assist device 18 can jointly drive the first gear ring 38 to rotate, thereby jointly driving the power output shaft 12 to rotate.

[0249] In some embodiments, one of the first sun gear 36 or the first planetary carrier 42 is connected to the output shaft of the speed regulating power unit 16, and the other is connected to the power output shaft 12.

[0250] Therefore, the speed regulating power device 16 can input the speed regulating power into the first transmission mechanism 20 through the first sun gear 36 or the first planetary carrier 42, and the first transmission mechanism 20 can output the power of the speed regulating power device 16 to the power output shaft 12 through the planetary carrier or the sun gear.

[0251] Specifically, in the embodiments shown in Figures 2 to 6, the speed-regulating power device 16 includes a speed-regulating motor. The output shaft of the speed-regulating power device 16 can be connected to the rotor of the speed-regulating motor. The output shaft of the speed-regulating power device 16 is connected to the first sun gear 36, and the first planetary carrier 42 is connected to the power output shaft 12. When the speed-regulating motor is working, it can drive the first sun gear 36 to rotate, and the first sun gear 36 drives the first planetary gear set 40 to rotate, thereby driving the first planetary carrier 42 and the power output shaft 12 to rotate, so as to realize the speed regulation of the power output shaft 12 by the speed-regulating power device 16.

[0252] In some embodiments, the output shaft of the speed-regulating power device 16 is connected to the first planetary carrier 42, and the first sun gear 36 is connected to the power output shaft 12. When the speed-regulating motor is working, it can drive the first planetary carrier 42 to rotate, and the first planetary carrier 42 drives the first planetary gear set 40 to rotate, thereby driving the first sun gear 36 and the power output shaft 12 to rotate, so that the speed-regulating power device 16 can adjust the speed of the power output shaft 12.

[0253] In some embodiments, the first gear ring 38 is connected to the second transmission mechanism 22 via the fourth transmission mechanism 46.

[0254] Therefore, the power assist device 18 can sequentially provide power to the first gear ring 38 of the first transmission mechanism 20 through the second transmission mechanism 22 and the fourth transmission mechanism 46, thereby providing assistance to the power output shaft 12.

[0255] Specifically, in the embodiments shown in Figures 2 to 6, the first planetary carrier 42 is connected to the power output shaft 12. The power assist device 18 includes a power assist motor. When the power assist motor is working, it can drive the second transmission mechanism 22 to move, thereby driving the components of the fourth transmission mechanism 46 and the first gear ring 38 to rotate. When the first gear ring 38 rotates, it can drive the first planetary gear set 40 to rotate, thereby driving the first planetary carrier 42 and the power output shaft 12 to rotate, so that the power assist device 18 provides assistance to the power output shaft 12.

[0256] In some embodiments, the second transmission mechanism 22 includes a gear transmission mechanism, which includes multiple gear components. The output shaft of the power assist device 18 is connected to one of the gear components, and the first transmission mechanism 20 is connected to the other gear component.

[0257] Therefore, the power assist unit 100 can be connected to the power assist device 18 and the first transmission mechanism 20 through a gear transmission mechanism, which has high transmission efficiency and can bear a large rotational torque.

[0258] Specifically, the toothed component may include, but is not limited to, gears, gear rings, and other toothed components. The teeth of two toothed components mesh with each other, so that when one toothed component rotates, it can drive the other toothed component to rotate, thereby realizing power transmission.

[0259] Of the two gear components, one can be a driving gear component and the other a driven gear component. The driving gear component can be connected to the output shaft of the power assist device 18, and the driven gear component can be connected to the first transmission mechanism 20. When the power assist device 18 drives the driving gear component to rotate, the driving gear component can drive the driven gear component to rotate, thereby driving the components of the first transmission mechanism 20 (such as the first gear ring 38, etc.) to rotate, thus realizing the transmission of power.

[0260] In some embodiments, the gear transmission mechanism includes a planetary gear transmission mechanism, which includes a sun gear, a ring gear, a planetary gear set, and a planet carrier. The sun gear is located inside the ring gear, and the planetary gear set is located between the inner ring of the ring gear and the outer ring of the sun gear. The planetary gear set meshes with both the ring gear and the sun gear. The planet carrier is connected to the middle of the planetary gears in the planetary gear set, and the planetary gears can drive the planet carrier to rotate when they rotate.

[0261] Therefore, the power of the power assist device 18 can be transmitted to the power output shaft 12 through the planetary gear transmission mechanism, which has high transmission efficiency and can bear a large torque.

[0262] Specifically, for ease of explanation, please refer to Figures 2 to 6. The sun gear, ring gear, planetary gear set, and planet carrier of the second transmission mechanism 22 are respectively the second sun gear 48, the second ring gear 50, the second planetary gear set 52, and the second planet carrier 54. In some embodiments, the power assist device 18 includes a power assist motor. In the embodiments shown in Figures 2 to 6, the second sun gear 48 is connected to the output shaft of the power assist motor, and the second planet carrier 54 is connected to the components of the first transmission mechanism 20 (such as the first ring gear 38, etc.).

[0263] When the power assist motor is working, it can drive the second sun gear 48 to rotate, which in turn drives the second planetary gear set 52 and the second planetary carrier 54 to rotate, thereby driving the components of the first transmission mechanism 20 (such as the first gear ring 38) to rotate. This enables the power of the power assist motor to be transmitted to the power output shaft 12 through the first transmission mechanism 20, thus providing power assistance to the power output shaft 12.

[0264] Since the second sun gear 48 and the second planetary gear set 52 are connected by meshing teeth, efficient power transmission and high torque transmission can be achieved.

[0265] The second planetary gear set 52 may include at least one planetary gear. In the embodiments shown in Figures 2 to 6, the second planetary gear set 52 includes multiple planetary gears (e.g., two or more).

[0266] In some embodiments, the planetary gear set includes multiple sets of planetary gears, one set of which meshes with the sun gear and another set of which meshes with the ring gear.

[0267] Therefore, power can be transmitted through multiple sets of planetary gears.

[0268] Specifically, in some embodiments, as shown in Figures 2 to 6, the planetary gear set includes two sets of planetary gears meshing with each other. One set of planetary gears meshes with the second sun gear 48, and the other set meshes with the second ring gear 50. Both sets of planetary gears are connected to the second planetary carrier 54. When the power assist motor is working, it can drive the second sun gear 48 to rotate, which in turn drives the meshed planetary gear set to rotate. This planetary gear set then drives the other planetary gear set and the second planetary carrier 54 to rotate, thereby driving the components of the first transmission mechanism 20 (such as the first ring gear 38) to rotate. This enables the power of the power assist motor to be transmitted to the power output shaft 12, providing power assistance to the power output shaft 12.

[0269] In some embodiments, the planetary gear set includes two or more sets of planetary gears, which mesh with each other in pairs. One planetary gear set meshes with the second sun gear 48, another planetary gear set meshes with the second ring gear 50, and other planetary gear sets mesh with either the first sun gear 48 or the first ring gear 50, serving as intermediate transmission components. One set of planetary gears can be connected to the second planetary carrier 54. When the power assist motor is working, it drives the second sun gear 48 to rotate, which in turn drives one of its meshing planetary gear sets to rotate. This planetary gear set then drives the remaining planetary gear sets and the second planetary carrier 54 to rotate, transmitting power to components of the first transmission mechanism 20 (such as the first ring gear 38), thus enabling the power assist motor to provide power to the power output shaft 12.

[0270] In some implementations, the number of teeth in one set of planetary gears may be the same as or different from the number of teeth in another set of planetary gears.

[0271] Therefore, the number of teeth in the planetary gear set can be configured according to the application scenario.

[0272] Specifically, in some implementations, one set of planetary gears has the same number of teeth as the other set, achieving a 1:1 transmission ratio. This allows the two sets of planetary gears to change only their rotational direction, without altering their speed or torque.

[0273] In some implementations, the number of teeth on one set of planetary gears differs from that on the other, achieving a transmission ratio other than 1:1. Specifically, the transmission ratio is equal to the inverse ratio of the number of teeth on the two sets of planetary gears. For example, if the planetary gears on the power input side have 8 teeth and the planetary gears on the power output side have 24 teeth, then their transmission ratio is 3:1, meaning the speed on the power output side is 1 / 3 of the speed on the power input side, and the torque on the power output side is 3 times the torque on the power input side. Conversely, if the planetary gears on the power input side have 24 teeth and the planetary gears on the power output side have 8 teeth, then their transmission ratio is 1:3, the speed on the power output side is 3 times the speed on the power input side, and the torque on the power output side is 1 / 3 of the torque on the power input side.

[0274] When a reduction in rotational speed is needed, a planetary gear with more teeth can be selected as the output gear, and a planetary gear with fewer teeth as the input gear. Conversely, when an increase in rotational speed is needed, a planetary gear with fewer teeth can be selected as the output gear, and a planetary gear with more teeth as the input gear. In addition to changes in rotational speed, torque will also change accordingly. During deceleration, torque will increase; during acceleration, torque will decrease.

[0275] In some embodiments, the output shaft of the power assist device 18 is connected to the sun gear or planetary carrier.

[0276] Thus, the power output from the power assist device 18 can be input to the planetary gear transmission mechanism via the sun gear or planet carrier.

[0277] Specifically, in some embodiments, the speed-regulating power unit 16 includes a speed-regulating motor. In the embodiments shown in Figures 2 to 6, the output shaft of the speed-regulating motor is connected to the second sun gear 48, thereby allowing the power output from the power-assist motor to be input into the planetary gear transmission mechanism via the second sun gear 48. The second planetary carrier 54 can be connected to components of the first transmission mechanism 20 (such as the first gear ring 38, etc.).

[0278] When the power assist motor is working, it can drive the second sun gear 48 to rotate, which in turn drives the second planetary gear set 52 and the second planetary carrier 54 to rotate, thereby driving the components of the first transmission mechanism 20 (such as the first gear ring 38) to rotate, thus realizing the power transmission of the power assist motor to the power output shaft 12 and providing assistance to the power output shaft 12.

[0279] In some embodiments, the output shaft of the power assist motor is connected to the second planetary carrier 54, thereby allowing the power output from the power assist motor to be input into the planetary gear transmission mechanism via the second planetary carrier 54. The second sun gear 48 may be connected to the first transmission mechanism 20 (such as the first ring gear 38, etc.).

[0280] When the power assist motor is working, it can drive the second planetary carrier 54 to rotate, which in turn drives the second planetary gear set 52 and the second sun gear 48 to rotate, thereby driving the components of the first transmission mechanism 20 (such as the first gear ring 38) to rotate, thus transmitting the power of the power assist motor to the power output shaft 12 and providing power assistance to the power output shaft 12.

[0281] In some embodiments, the first transmission mechanism 20 is connected to the planet carrier or the sun gear.

[0282] Thus, the power transmitted by the planetary gear transmission mechanism can be transmitted to the first transmission mechanism 20 through the planet carrier or the sun gear, thereby providing assistance to the power output shaft 12.

[0283] Specifically, the power assist device 18 includes a power assist motor. In the embodiments shown in Figures 2 to 6, components of the first transmission mechanism 20 (such as the first ring gear 38) are connected to the second planetary carrier 54, thereby allowing the power transmitted by the planetary gear transmission mechanism to be output to the components of the first transmission mechanism 20 (such as the first ring gear 38) via the second planetary carrier 54. The output shaft of the power assist motor can be connected to the second sun gear 48.

[0284] When the power assist motor is working, it can drive the second sun gear 48 to rotate, which in turn drives the second planetary gear set 52 and the second planetary carrier 54 to rotate, thereby driving the components of the first transmission mechanism 20 (such as the first gear ring 38) to rotate, thus realizing the power transmission of the power assist motor to the power output shaft 12 and providing assistance to the power output shaft 12.

[0285] In some embodiments, components of the first transmission mechanism 20 (such as the first gear ring 38) are connected to the second sun gear 48, thereby allowing the power transmitted by the planetary gear transmission mechanism to be output to the components of the first transmission mechanism 20 (such as the first gear ring 38) via the second sun gear 48. The output shaft of the power assist motor may be connected to the second planetary carrier 54.

[0286] When the power assist motor is working, it can drive the second planetary carrier 54 to rotate, which in turn drives the second planetary gear set 52 and the second sun gear 48 to rotate, thereby driving the components of the first transmission mechanism 20 (such as the first gear ring 38) to rotate, thus transmitting the power of the power assist motor to the power output shaft 12 and providing power assistance to the power output shaft 12.

[0287] In some implementations, the gear ring is fixed and does not rotate.

[0288] This can improve the stability of the power assist device 18 during operation.

[0289] Specifically, in the embodiments shown in Figures 2 to 6, the output shaft of the power assist motor is connected to the second sun gear 48, and the second planetary carrier 54 is connected to the components of the first transmission mechanism 20 (such as the first gear ring 38). When the power assist motor is working, it can drive the second sun gear 48 to rotate, which in turn drives the second planetary gear set 52 and the second planetary carrier 54 to rotate, thereby driving the components of the first transmission mechanism 20 (such as the first gear ring 38) to rotate. The second gear ring 50 of the second transmission mechanism 22 is fixed and does not rotate, allowing the planetary gears rotating inside the second gear ring 50 of the second planetary gear set 52 to rotate smoothly. This enables the torque of the power assist motor to be transmitted to the second planetary carrier 54 and the components of the first transmission mechanism 20 (such as the first gear ring 38), providing a larger and smoother torque to the power output shaft 12 from the power assist power device 18.

[0290] In some embodiments, the output shaft of the power assist motor is connected to the second planetary carrier 54, and the second sun gear 48 is connected to components of the first transmission mechanism 20 (such as the first gear ring 38).

[0291] In some embodiments, one of the sun gear or planetary carrier is connected to the output shaft of the power assist device 18, and the other is connected to the first transmission mechanism 20.

[0292] Thus, the power assist device 18 can input the power assist to the second transmission mechanism 22 through the sun gear or planetary carrier, and the second transmission mechanism 22 can output the power assist device 18 to the components of the first transmission mechanism 20 (such as the first gear ring 38, etc.) through the planetary carrier or sun gear.

[0293] Specifically, in the embodiments shown in Figures 2 to 6, the power assist device 18 includes a power assist motor. The output shaft of the power assist device 18 can be connected to the rotor of the power assist motor. The output shaft of the power assist device 18 is connected to the second sun gear 48, and the second planetary carrier 54 is connected to the components of the first transmission mechanism 20 (such as the first gear ring 38). When the power assist motor is working, it can drive the second sun gear 48 to rotate, which in turn drives the second planetary gear set 52 to rotate, thereby driving the second planetary carrier 54 and the components of the first transmission mechanism 20 (such as the first gear ring 38) to rotate, thus enabling the power assist device 18 to provide assistance to the power output shaft 12.

[0294] In some embodiments, the output shaft of the power assist device 18 is connected to the second planetary carrier 54, and the second sun gear 48 is connected to components of the first transmission mechanism 20 (such as the first gear ring 38). When the power assist motor is working, it can drive the second planetary carrier 54 to rotate, which in turn drives the second planetary gear set 52 to rotate, thereby driving the second sun gear 48 and components of the first transmission mechanism 20 (such as the first gear ring 38) to rotate, thus enabling the power assist device 18 to provide assistance to the power output shaft 12.

[0295] In some embodiments, the power input shaft 14 further includes a third transmission mechanism 44, through which the power input shaft 14 drives a component of the first transmission mechanism 20 to rotate.

[0296] Therefore, when the power assist device 18 is working, the power input shaft 14 and the power assist device 18 can jointly drive the power output shaft 12 to rotate. When the power assist device 18 is not working, the power input shaft 14 can drive the power output shaft 12 to rotate independently.

[0297] Specifically, the power assist device 18 can be connected to the power output shaft 12 via the second transmission mechanism 22 and the first transmission mechanism 20. The power output shaft 12 is connected to a component of the first transmission mechanism 20 (such as the first gear ring 38) via the third transmission mechanism 44. When the power input shaft 14 receives power input from the power input device 200, the power input shaft 14 can transmit power to the first gear ring 38 via the third transmission mechanism 44, thereby driving the first gear ring 38 to rotate.

[0298] The first gear ring 38 can be connected to the first planetary carrier 42 via the first planetary gear set 40. The first planetary carrier 42 is connected to the power output shaft 12, so that the first gear ring 38 can drive the power output shaft 12 to rotate, and the power input from the power input shaft 14 is transmitted to the power output shaft 12 via the third transmission mechanism 44 and the first transmission mechanism 20.

[0299] In the embodiments shown in Figures 2 to 6, the power assist device 18 is connected to the first gear ring 38 through the second transmission mechanism 22. When the power assist device 18 is working, it can drive the first gear ring 38 to rotate through the second transmission mechanism 22. Thus, the power input by the power input device 200 and the assistance provided by the power assist device 18 can jointly drive the first gear ring 38 to rotate, thereby jointly driving the power output shaft 12 to rotate.

[0300] In some embodiments, the third transmission mechanism 44 includes at least one of the following: a mechanical transmission mechanism, a hydraulic transmission mechanism, a magnetic transmission mechanism, a fluid transmission mechanism, and an electromagnetic transmission mechanism.

[0301] Therefore, the structure of the third transmission mechanism 44 can be flexibly configured.

[0302] Specifically, in some embodiments, the third transmission mechanism 44 includes a mechanical transmission mechanism, a hydraulic transmission mechanism, a magnetic transmission mechanism, a fluid transmission mechanism, or an electromagnetic transmission mechanism. In some embodiments, the third transmission mechanism 44 includes any two, three, or four of the following: a mechanical transmission mechanism, a hydraulic transmission mechanism, a magnetic transmission mechanism, a fluid transmission mechanism, and an electromagnetic transmission mechanism.

[0303] For detailed descriptions of mechanical transmission mechanisms, hydraulic transmission mechanisms, magnetic transmission mechanisms, fluid transmission mechanisms, and electromagnetic transmission mechanisms, please refer to the descriptions of the above implementation methods; they will not be elaborated upon here.

[0304] In some embodiments, the mechanical transmission mechanism includes at least one of the following: a gear transmission mechanism, a wheel transmission mechanism, and a worm gear transmission mechanism.

[0305] Therefore, mechanical transmission mechanisms have a simple structure and low cost.

[0306] Specifically, in some embodiments, the mechanical transmission mechanism includes a gear transmission mechanism, a wheel transmission mechanism, or a worm gear transmission mechanism. In some embodiments, the mechanical transmission mechanism includes any two of the following: a gear transmission mechanism, a wheel transmission mechanism, and a worm gear transmission mechanism.

[0307] For a detailed description of the gear transmission mechanism, wheel transmission mechanism and worm gear transmission mechanism, please refer to the description of the above implementation method, which will not be elaborated here.

[0308] In some embodiments, the wheel drive mechanism includes two drive wheels 32 and a drive member 34. One drive wheel 32 is connected to the power input shaft 14, and the other drive wheel 32 is connected to the first transmission mechanism 20. The drive member 34 is connected to the two drive wheels 32 to drive the two drive wheels 32 to rotate together.

[0309] Thus, the power input shaft 14 can drive a component of the first transmission mechanism 20 to rotate via the third transmission mechanism 44.

[0310] Specifically, of the two transmission wheels 32, one can be a driving transmission wheel 32 and the other a driven transmission wheel 32. The driving transmission wheel 32 can be connected to the power input shaft 14, and the driven transmission wheel 32 can be connected to a component of the first transmission mechanism 20 (such as the first gear ring 38). The transmission member 34 is connected to both the driving and driven transmission wheels 32. When the power input shaft 14 receives power input from the power input device 200, the power input shaft 14 rotates, driving the driving transmission wheel 32 to rotate. When the driving transmission wheel 32 rotates, it drives the transmission member 34 to drive the driven transmission wheel 32 to rotate. When the driven transmission wheel 32 rotates, it drives a component of the first transmission mechanism 20 (such as the first gear ring 38) to rotate, thereby enabling the power input shaft 14 to drive a component of the first transmission mechanism 20 (such as the first gear ring 38) to rotate via the third transmission mechanism 44.

[0311] In some embodiments, the drive wheel 32 includes at least one of the following: a pulley, a sprocket;

[0312] The transmission component 34 includes at least one of the following: a belt, a chain.

[0313] Therefore, the wheel transmission mechanism has a simple structure and is easy to assemble.

[0314] Specifically, in some embodiments, the drive wheel 32 includes a pulley, and the drive member 34 includes a belt connected to two pulleys to drive the two pulleys to rotate together. In some embodiments, the drive wheel 32 includes a sprocket, and the drive member 34 includes a chain connected to two sprockets to drive the two sprockets to rotate together. In some embodiments, the drive wheel 32 includes both a pulley and a sprocket, and the drive member 34 includes both a belt and a chain. The belt is connected to the two pulleys to drive them to rotate together, and the chain is connected to the two sprockets to drive them to rotate together.

[0315] During assembly, wrap the belt around the outer circumference of the pulley and tighten it to prevent slippage. Alternatively, wrap the chain around the outer circumference of the sprocket and tighten it to prevent slippage, thus improving assembly efficiency.

[0316] In some embodiments, the assist unit 100 further includes a fourth transmission mechanism 46, through which the second transmission mechanism 22 drives a component of the first transmission mechanism 20 to rotate.

[0317] Thus, the power assist device 18 can sequentially provide power to a component of the first transmission mechanism 20 through the second transmission mechanism 22 and the fourth transmission mechanism 46, thereby providing assistance to the power output shaft 12.

[0318] Specifically, in the embodiments shown in Figures 2 to 6, the first planetary carrier 42 is connected to the power output shaft 12. The power assist device 18 includes a power assist motor. When the power assist motor is working, it can drive the second transmission mechanism 22 to move, thereby driving the components of the fourth transmission mechanism 46 and a component of the first transmission mechanism 20 (such as the first gear ring 38) to rotate. When the first gear ring 38 rotates, it can drive the first planetary gear set 40 to rotate, thereby driving the first planetary carrier 42 and the power output shaft 12 to rotate, so that the power assist device 18 provides assistance to the power output shaft 12.

[0319] In some embodiments, the fourth transmission mechanism 46 includes at least one of the following: a mechanical transmission mechanism, a hydraulic transmission mechanism, a magnetic transmission mechanism, a fluid transmission mechanism, or an electromagnetic transmission mechanism.

[0320] Therefore, the structure of the fourth transmission mechanism 46 can be flexibly configured.

[0321] Specifically, in some embodiments, the fourth transmission mechanism 46 includes a mechanical transmission mechanism, a hydraulic transmission mechanism, a magnetic transmission mechanism, a fluid transmission mechanism, or an electromagnetic transmission mechanism. In some embodiments, the fourth transmission mechanism 46 includes any two, three, or four of the following: a mechanical transmission mechanism, a hydraulic transmission mechanism, a magnetic transmission mechanism, a fluid transmission mechanism, and an electromagnetic transmission mechanism.

[0322] For detailed descriptions of mechanical transmission mechanisms, hydraulic transmission mechanisms, magnetic transmission mechanisms, fluid transmission mechanisms, and electromagnetic transmission mechanisms, please refer to the descriptions of the above implementation methods; they will not be elaborated upon here.

[0323] It is understood that the structures of the compensation transmission mechanism 24, the third transmission mechanism 44 and the fourth transmission mechanism 46 may be the same or different, and this application does not limit them.

[0324] In some embodiments, the mechanical transmission mechanism includes at least one of the following: a gear transmission mechanism, a wheel transmission mechanism, and a worm gear transmission mechanism.

[0325] Therefore, mechanical transmission mechanisms have a simple structure and low cost.

[0326] Specifically, in some embodiments, the mechanical transmission mechanism includes: a gear transmission mechanism, a wheel transmission mechanism, and a worm gear transmission mechanism. In some embodiments, the mechanical transmission mechanism includes any one or any two of the following: a gear transmission mechanism, a wheel transmission mechanism, and a worm gear transmission mechanism.

[0327] For a detailed description of the gear transmission mechanism, wheel transmission mechanism and worm gear transmission mechanism, please refer to the description of the above implementation method, which will not be elaborated here.

[0328] In some embodiments, the wheel drive mechanism includes two drive wheels 32 and a drive member 34. One drive wheel 32 is connected to the second drive mechanism 22, and the other drive wheel 32 is connected to the first drive mechanism 20. The drive member 34 is connected to both drive wheels 32 to drive the two drive wheels 32 to rotate together.

[0329] Thus, the power assist device 18 can drive a component of the first transmission mechanism 20 to rotate through the second transmission mechanism 22 and the fourth transmission mechanism 46.

[0330] Specifically, of the two transmission wheels 32, one can be a driving transmission wheel 32 and the other a driven transmission wheel 32. The driving transmission wheel 32 can be connected to a component of the second transmission mechanism 22 (such as the second planetary carrier 54), and the driven transmission wheel 32 can be connected to a component of the first transmission mechanism 20 (such as the first gear ring 38). The transmission member 34 is connected to both the driving and driven transmission wheels 32. When the output shaft of the power assist device 18 drives a component of the second transmission mechanism 22 (such as the second planetary carrier 54) to rotate, the second planetary carrier 54 drives the driving transmission wheel 32 to rotate. When the driving transmission wheel 32 rotates, it drives the transmission member 34 to drive the driven transmission wheel 32 to rotate. When the driven transmission wheel 32 rotates, it drives a component of the first transmission mechanism 20 (such as the first gear ring 38) to rotate. Thus, the power assist device 18 drives a component of the first transmission mechanism 20 (such as the first gear ring 38) to rotate through the second transmission mechanism 22 and the fourth transmission mechanism 46, providing assistance to the power output shaft 12.

[0331] In some embodiments, the drive wheel 32 includes at least one of the following: a belt pulley and a sprocket.

[0332] The transmission component 34 includes at least one of the following: a belt, a chain.

[0333] Therefore, the wheel transmission mechanism has a simple structure and is easy to assemble.

[0334] Specifically, in some embodiments, the drive wheel 32 includes a pulley, and the drive member 34 includes a belt connected to two pulleys to drive the two pulleys to rotate together. In some embodiments, the drive wheel 32 includes a sprocket, and the drive member 34 includes a chain connected to two sprockets to drive the two sprockets to rotate together. In some embodiments, the drive wheel 32 includes both a pulley and a sprocket, and the drive member 34 includes both a belt and a chain. The belt is connected to the two pulleys to drive them to rotate together, and the chain is connected to the two sprockets to drive them to rotate together.

[0335] During assembly, wrap the belt around the outer circumference of the pulley and tighten it to prevent slippage. Alternatively, wrap the chain around the outer circumference of the sprocket and tighten it to prevent slippage, thus improving assembly efficiency.

[0336] In some embodiments, referring to Figures 1, 3 to 6, the power input shaft 14 further includes a clutch 56. The power input shaft 14 drives a component of the first transmission mechanism 20 to rotate through the third transmission mechanism 44. The clutch 56 is used to disconnect or connect the transmission connection in which the power input shaft 14 drives a component of the first transmission mechanism 20 to rotate through the third transmission mechanism 44.

[0337] Therefore, the clutch 56 has a simple structure and low cost.

[0338] Optionally, the clutch 56 may include a first part and a second part. The first part may be connected to the power input shaft 14, and the second part may be connected to a component of the third transmission mechanism 44.

[0339] The first part can engage and disengage with the second part. When the first part is engaged with the second part, the clutch 56 enables the power input shaft 14 to drive a component of the first transmission mechanism 20 to rotate via the third transmission mechanism 44. When the first part is disengaged from the second part, the clutch 56 disengages the power input shaft 14 from driving a component of the first transmission mechanism 20 to rotate via the third transmission mechanism 44.

[0340] The clutch 56 is technologically mature and has a simple structure, which can effectively reduce the cost of the power assist unit 100.

[0341] In some implementations, the clutch 56 includes a one-way bearing 30.

[0342] Therefore, the transmission connection can be disconnected and made active through the one-way bearing 30.

[0343] Specifically, the one-way bearing 30 allows the shaft to rotate freely in one direction while locking or generating significant resistance in the other.

[0344] When the rotational speed of the power input shaft 14 is greater than or equal to the rotational speed of the third transmission mechanism 44, the one-way bearing 30 can conduct the transmission connection that allows the power input shaft 14 to drive a component of the first transmission mechanism 20 to rotate through the third transmission mechanism 44. Thus, the power input shaft 14 can drive a component of the first transmission mechanism 20 (the first gear ring 38 as shown in the figure) to rotate through the third transmission mechanism 44, thereby driving the power output shaft 12 to rotate.

[0345] When the rotational speed of the power input shaft 14 is less than the rotational speed of the third transmission mechanism 44, the one-way bearing 30 can disconnect the transmission connection that allows the power input shaft 14 to drive a component of the first transmission mechanism 20 to rotate through the third transmission mechanism 44. At this time, the power input shaft 14 cannot drive a component of the first transmission mechanism 20 to rotate through the third transmission mechanism 44.

[0346] In some embodiments, the one-way bearing 30 is connected to the power input shaft 14, and the third transmission mechanism 44 is connected to the power input shaft 14 via the one-way bearing 30.

[0347] Therefore, the installation of the one-way bearing 30 is simple and efficient.

[0348] Specifically, the one-way bearing 30 can disconnect or connect the transmission connection that drives the power input shaft 14 to rotate a component of the first transmission mechanism 20 through the third transmission mechanism 44, so that the power received by the power input shaft 14 can be transmitted from the third transmission mechanism 44 to the first transmission mechanism 20, and the power cannot be transmitted from the third transmission mechanism 44 to the power input shaft 14.

[0349] In some embodiments, when the speed of the third transmission mechanism 44 is greater than the speed of the power input shaft 14, the one-way bearing 30 disconnects the transmission connection through which the power input shaft 14 drives a component of the first transmission mechanism 20 to rotate.

[0350] Therefore, unidirectional power transmission can be achieved through the one-way bearing 30.

[0351] Specifically, when the speed of the third transmission mechanism 44 is greater than the speed of the power input shaft 14, the one-way bearing 30 disconnects the transmission connection that allows the power input shaft 14 to drive a component of the first transmission mechanism 20 to rotate through the third transmission mechanism 44, so that the power of the third transmission mechanism 44 cannot be transmitted to the power input shaft 14.

[0352] When the speed of the third transmission mechanism 44 is less than or equal to the speed of the power input shaft 14, the one-way bearing 30 conducts a transmission connection through which the power input shaft 14 drives a component of the first transmission mechanism 20 to rotate via the third transmission mechanism 44. This allows the power of the power input shaft 14 to be transmitted to the power output shaft 12 by the third transmission mechanism 44 driving a component of the first transmission mechanism 20 (such as the first gear ring 38).

[0353] In some embodiments, the output shaft of the power assist device 18 is a hollow shaft, and the power input shaft 14 passes through the output shaft of the power assist device 18.

[0354] This allows for a compact and low-cost assist unit 100, which is beneficial for miniaturization design of the assist unit 100.

[0355] Specifically, the power input shaft 14 passes through the output shaft of the power assist device 18, which avoids the space occupied by setting up the power input shaft 14 separately, and also saves the additional transmission mechanism required because the power input shaft 14 is located outside the output shaft of the power assist device 18.

[0356] In some embodiments, the power assist device 18 includes a power assist motor, the rotor of which can be connected to the output shaft of the power assist device 18. When the power assist motor is working, it can drive the output shaft to rotate. The output shaft can drive a component of the first transmission mechanism 20 to rotate via the second transmission mechanism 22, thereby providing power assistance to the power output shaft 12. When the power input shaft 14 rotates, it can drive a component of the first transmission mechanism 20 to rotate via the third transmission mechanism 44, thereby transmitting the power from the power input device 200 to the power output shaft 12.

[0357] In some embodiments, the output shaft of the power assist device 18 is rotatable relative to the power input shaft 14.

[0358] Therefore, the output shaft of the power assist device 18 and the power input shaft 14 can rotate independently of each other.

[0359] Specifically, the power input shaft 14 passes through the hollow output shaft of the power assist device 18, and the output shaft of the power assist device 18 can rotate relative to the power input shaft 14. Therefore, when the power assist motor is working, the power assist motor can drive the output shaft to rotate, and the output shaft can drive a component of the first transmission mechanism 20 to rotate through the second transmission mechanism 22, thereby providing assistance to the power output shaft 12.

[0360] In some embodiments, a bearing is provided between the output shaft of the power assist device 18 and the power input shaft 14.

[0361] Therefore, the rotational connection structure between the output shaft of the power assist device 18 and the power input shaft 14 is simple and low in cost.

[0362] Specifically, the bearing includes an inner ring and an outer ring. The output shaft of the power assist device 18 is a hollow shaft, and the power input shaft 14 passes through the output shaft of the power assist device 18. The bearing can be disposed inside the output shaft of the power assist device 18. The outer ring of the bearing is fixedly connected to the output shaft of the power assist device 18, and the inner ring of the bearing can pass through the power input shaft 14 and be fixedly connected to the inner ring of the bearing. Thus, the output shaft of the power assist device 18 can rotate relative to the power input shaft 14 through the bearing.

[0363] The bearings located in the output shaft of the power assist device 18 can be one or more, and multiple bearings can be evenly spaced in the output shaft of the power assist device 18 to provide more stable support for the power input shaft 14.

[0364] In some embodiments, the power assist device 18 and at least some components of the second transmission mechanism 22 are arranged along the extension direction of the power input shaft 14.

[0365] This allows for a compact assist unit 100, which is beneficial for miniaturization design of the assist unit 100.

[0366] Specifically, the components of the power assist device 18 and at least part of the second transmission mechanism 22 are arranged along the extension direction of the power input shaft 14, which can reduce the space occupied by the components of the power assist unit 100 in the direction perpendicular to the extension direction of the power input shaft 14, and can realize a compact power assist unit 100, which is beneficial to the miniaturization design of the power assist unit 100.

[0367] In the illustrated embodiment, the second transmission mechanism 22 includes a planetary gear transmission mechanism, which includes a second sun gear 48 and a second planet carrier 54. The power input shaft 14 passes through the second sun gear 48 and the second planet carrier 54. The power assist device 18, the second sun gear 48 and the second planet carrier 54 are arranged along the extension direction of the power input shaft 14.

[0368] In other embodiments, other components of the second transmission mechanism 22 and the power assist device 18 may be arranged along the extension direction of the power input shaft 14, or all components of the power assist device 18 and the second transmission mechanism 22 may be arranged along the extension direction of the power input shaft 14.

[0369] In some embodiments, at least some components of the second transmission mechanism 22 are mounted on the power input shaft 14.

[0370] Therefore, the assembly of at least some components of the second transmission mechanism 22 with the power input shaft 14 is simple and conducive to improving assembly efficiency.

[0371] Specifically, in the illustrated embodiment, the second transmission mechanism 22 includes a planetary gear transmission mechanism, which comprises a second sun gear 48 and a second planetary carrier 54, both of which are mounted on the power input shaft 14. The second sun gear 48 and the second planetary carrier 54 are designed to accommodate the power input shaft 14. During assembly, the power input shaft 14 can be directly passed through the second sun gear 48 and the second planetary carrier 54, thus improving assembly efficiency.

[0372] In other embodiments, other components of the second transmission mechanism 22 may be sleeved on the power input shaft 14, or all components of the second transmission mechanism 22 may be sleeved on the power input shaft 14.

[0373] In some embodiments, the power assist device 18 is mounted on the power input shaft 14.

[0374] Therefore, the assembly of the power assist device 18 and the power input shaft 14 is simple and conducive to improving assembly efficiency.

[0375] Specifically, in the illustrated embodiment, the power assist device 18 includes an output shaft, which is a hollow shaft with a reserved space inside for the power input shaft 14 to pass through. During assembly, the power input shaft 14 can be directly inserted into the output shaft of the power assist device 18, so that the power assist device 18 is fitted onto the power input shaft 14, which helps to improve assembly efficiency.

[0376] In some embodiments, the output shaft of the power assist device 18 is coaxially arranged with the power input shaft 14.

[0377] This allows for a compact assist unit 100, which is beneficial for miniaturization design of the assist unit 100.

[0378] Specifically, the output shaft of the power assist device 18 and the power input shaft 14 are coaxially arranged, which can reduce the space occupied in the direction perpendicular to the extension direction of the power input shaft 14 caused by the eccentric arrangement of the output shaft of the power assist device 18 and the power input shaft 14. This can achieve a compact power assist unit 100 and is conducive to the miniaturization design of the power assist unit 100.

[0379] It is also easy to achieve that the output shaft of the power assist device 18 and the power input shaft 14 are coaxial. In some embodiments, a bearing is provided in the output shaft of the power assist device 18, and the power input shaft 14 passes through the bearing, so that the output shaft of the power assist device 18 and the power input shaft 14 are coaxial, and the output shaft of the power assist device 18 can rotate relative to the power input shaft 14.

[0380] In some embodiments, the speed regulating power unit 16 and at least some components of the first transmission mechanism 20 are arranged along the extension direction of the power output shaft 12.

[0381] This allows for a compact assist unit 100, which is beneficial for miniaturization design of the assist unit 100.

[0382] Specifically, the components of the speed regulating power device 16 and at least part of the first transmission mechanism 20 are arranged along the extension direction of the power output shaft 12, which can reduce the space occupied by the components of the assist unit 100 in the direction perpendicular to the extension direction of the power output shaft 12, and can realize a compact assist unit 100, which is beneficial to the miniaturization design of the assist unit 100.

[0383] In the illustrated embodiment, the first transmission mechanism 20 includes a planetary gear transmission mechanism. The planetary gear transmission mechanism includes a first sun gear 36 and a first ring gear 38, and the speed regulating power device 16, the first sun gear 36, and the first ring gear 38 are arranged along the extension direction of the power output shaft 12.

[0384] In other embodiments, other components of the first transmission mechanism 20 and the speed regulating power device 16 may be arranged along the extension direction of the power output shaft 12, or all components of the speed regulating power device 16 and the first transmission mechanism 20 may be arranged along the extension direction of the power output shaft 12.

[0385] In some embodiments, at least some components of the first transmission mechanism 20 are fitted onto the extension of the power output shaft 12.

[0386] Therefore, the assembly of at least some components of the first transmission mechanism 20 with the power input shaft 14 is simple and conducive to improving assembly efficiency.

[0387] Specifically, in the illustrated embodiment, the first transmission mechanism 20 includes a planetary gear transmission mechanism. The planetary gear transmission mechanism includes a first sun gear 36 and a first ring gear 38. The first sun gear 36 and the first ring gear 38 can be fitted onto the extension line of the power output shaft 12. Space can be reserved for assembly of the first sun gear 36 and the first ring gear 38. During assembly, the first sun gear 36 and the first ring gear 38 can be assembled according to the position of the extension line of the power output shaft 12, so that the first sun gear 36 and the first ring gear 38 are fitted onto the extension line of the power output shaft 12, which helps to improve assembly efficiency. The first planetary carrier 42 can pass through the first ring gear 38 to connect with the power output shaft 12.

[0388] In other embodiments, other components of the first transmission mechanism 20 may be sleeved on the extension line of the power output shaft 12, or all components of the first transmission mechanism 20 may be sleeved on the extension line of the power input shaft 14.

[0389] In some embodiments, the output shaft of the speed regulating power unit 16 is coaxially arranged with the power output shaft 12.

[0390] This allows for a compact assist unit 100, which is beneficial for miniaturization design of the assist unit 100.

[0391] Specifically, the output shaft of the speed regulating power device 16 is coaxially arranged with the power output shaft 12, which can reduce the space occupied in the direction perpendicular to the extension direction of the power output shaft 12 caused by the eccentric arrangement of the output shaft of the speed regulating power device 16 and the power output shaft 12. This can realize a compact assist unit 100, which is beneficial to the miniaturization design of the assist unit 100.

[0392] In some embodiments, the rotational speed of the power output shaft 12 increases as the rotational speed of the speed regulating power unit 16 and / or the rotational speed of the power input shaft 14 increases.

[0393] Therefore, the rotational speed of the power output shaft 12 is positively correlated with the rotational speed of the speed regulating power device 16 and / or the rotational speed of the power input shaft 14.

[0394] Specifically, in some embodiments, the rotational speed of the power output shaft 12 increases as the rotational speed of the speed-regulating power device 16 increases. The speed-regulating power device 16 can be connected to the power output shaft 12 via the first transmission mechanism 20. In the illustrated embodiment, the output shaft of the speed-regulating power device 16 is connected to the first sun gear 36, and the first planetary carrier 42 is connected to the power output shaft 12. When the speed-regulating motor of the speed-regulating power device 16 is working, it can drive the output shaft of the speed-regulating power device 16 to rotate, thereby driving the first sun gear 36 to rotate. The first sun gear 36 drives the first planetary gear set 40 to rotate, causing the first planetary carrier 42 and the power output shaft 12 to rotate. The higher the rotational speed of the speed-regulating motor, the more power is transmitted to the power output shaft 12 through the first transmission mechanism 20, resulting in a higher rotational speed of the power output shaft 12.

[0395] In some embodiments, the rotational speed of the power output shaft 12 increases as the rotational speed of the power input shaft 14 increases. In the illustrated embodiment, the power input shaft 14 can be connected to the power output shaft 12 via a third transmission mechanism 44 and a first transmission mechanism 20. Specifically, the power input shaft 14 is connected to a component of the first transmission mechanism 20 (such as a first gear ring 38) via the third transmission mechanism 44. The first gear ring 38 is connected to a first planetary gear set 40, and the first planetary gear set 40 is connected to the power output shaft 12 via a first planetary carrier 42. The power input shaft 14 receives power input from the power input device 200, which can drive the third transmission mechanism 44 to move, thereby driving the first gear ring 38 to rotate. The first gear ring 38 drives the first planetary gear set 40 to rotate, causing the first planetary carrier 42 and the power output shaft 12 to rotate. The higher the rotational speed of the power input shaft 14, the more power is transmitted to the power output shaft 12 through the third transmission mechanism 44 and the first transmission mechanism 20, resulting in a higher rotational speed of the power output shaft 12.

[0396] In some embodiments, the rotational speed of the power output shaft 12 increases with the increase of the rotational speed of the speed regulating power device 16 and the rotational speed of the power input shaft 14. When both the speed regulating power device 16 and the power input shaft 14 are operating, if the rotational speed of the speed regulating power device 16 is greater than the rotational speed of the power input shaft 14, the speed regulating power device 16 can drive the power output shaft 12 to rotate, and the rotational speed of the power output shaft 12 increases with the increase of the rotational speed of the speed regulating power device 16. If the rotational speed of the power input shaft 14 is greater than the rotational speed of the speed regulating power device 16, the power input shaft 14 can drive the power output shaft 12 to rotate, and the rotational speed of the power output shaft 12 increases with the increase of the rotational speed of the power input shaft 14. When the speed regulating power device 16 is not operating but the power input shaft 14 is operating, the power input shaft 14 can drive the power output shaft 12 to rotate, and the rotational speed of the power output shaft 12 increases with the increase of the rotational speed of the power input shaft 14. When the speed regulating power device 16 is working and the power input shaft 14 is not working, the speed regulating power device 16 can drive the power output shaft 12 to rotate, and the speed of the power output shaft 12 increases as the speed of the speed regulating power device 16 increases.

[0397] In some embodiments, the rotational speed of the speed regulating power device 16 is adjusted according to the rotational speed of the power input shaft 14.

[0398] Therefore, the speed regulation power unit 16 can be used to meet the speed requirements of the power output shaft 12.

[0399] Specifically, the power assist unit 100 may include a controller and a speed sensor, and the speed regulating power unit 16 includes a speed regulating motor. The controller is electrically connected to the speed sensor and the speed regulating motor. The speed sensor can be used to detect the rotational speed of the power input shaft 14 (such as the pedal cadence). The controller adjusts the rotational speed of the speed regulating power unit 16 according to the rotational speed of the power input shaft 14 to meet the rotational speed requirements of the power output shaft 12.

[0400] In some embodiments, the planetary gear transmission mechanism of the first transmission mechanism 20 includes a first sun gear 36, a first planet carrier 42, and a first ring gear 38. The planetary gear transmission mechanism of the second transmission mechanism 22 includes a second planet carrier 54.

[0401] (1) Let n1S1, n1R1, and n1C1 be the rotational speeds of the first sun gear 36, the first ring gear 38, and the first planetary carrier 42, respectively, and α1 be the gear ratio or pitch circle radius ratio between the first ring gear 38 and the first sun gear 36.

[0402] (2) Let TS1, TR1, and TC1 be the torques of the first sun gear 36, the first ring gear 38, and the first planetary carrier 42, respectively, and α1 be the gear ratio or pitch circle radius ratio between the first ring gear 38 and the first sun gear.

[0403] Rotational speed relationship: n1S1+α1×n1R1=(1+α1)×n1C1;

[0404] Torque relationship: TS1:TR1:TC1=1:α1:-(1+α1);

[0405] (a) Since the first gear ring 38 is connected to the power input shaft 14 through the transmission component 34 and the two transmission wheels 32 of the third transmission mechanism 44, therefore, n1R1=V 动力输入 ;

[0406] (b) The first sun gear 36 is connected to the output shaft of the speed regulating power device 16, therefore, n1S1=V 调速电机 ;

[0407] (c) Since the power input shaft 14 and the second planetary carrier 54 of the second transmission mechanism 22 are connected through the fourth transmission mechanism 46 and the third transmission mechanism 44, TR1 = T 动力输入 +TC2, where TC2 is the torque of the second planetary carrier 54;

[0408] (d) Since the first planetary carrier 42 is connected to the power output shaft 12, therefore, V 输出 =n1C1,T 输出 =TC1,T 调速电机 =TS1.

[0409] Therefore, V 调速电机 +α1×V 动力输入 = (1+α1)×V 动力输出 (A);

[0410] TS1:TR1:TC1=T 调速电机 :(TR1=T 动力输入 +TC2):T 输出 =1:α1:-(1+α1) (B).

[0411] When the transmission connection between the power assist unit 18 and the speed regulating power unit 16 via the compensation transmission mechanism 24 is disconnected, the power assist unit 100 is in shift mode. In shift mode, the speed of the speed regulating power unit 16 is adjustable. As shown in formula A, when the required speed V of the power output shaft 12... 动力输出 At a certain time, the rotational speed V of the power input shaft 14 can be used as a reference. 动力输入 Adjust the speed V of the speed regulating power device 16 调速电机 This is to meet the speed requirements of the power output shaft 12.

[0412] It is understood that in other embodiments, when the transmission mechanism adopts other types of structures to achieve power transmission, the mapping relationship between the speed of the speed regulating power device 16, the speed of the power input shaft 14, and the speed of the power output shaft 12 can be established by combining the above analysis process.

[0413] In some embodiments, the torque of the power output shaft 12 increases as the torque of the power assist device 18 and the torque of the power input shaft 14 increase.

[0414] Therefore, the torque of the power output shaft 12 is positively correlated with the torque of the power assist device 18 and the torque of the power input shaft 14.

[0415] Specifically, in the figure, the power assist device 18 can be connected to the power output shaft 12 via the second transmission mechanism 22, the fourth transmission mechanism 46, and the first transmission mechanism 20. In the illustrated embodiment, the output shaft of the power assist device 18 is connected to the second sun gear 48, the second planetary carrier 54 is connected to the first ring gear 38 of the first transmission mechanism 20 via the fourth transmission mechanism 46, the first ring gear 38 is connected to the first planetary gear set 40, and the first planetary gear set 40 is connected to the power output shaft 12 via the first planetary carrier 42. When the power assist motor of the power assist device 18 is working, it can drive the output shaft of the power assist device 18 to rotate, thereby driving the second sun gear 48 to rotate. The second sun gear 48 drives the second planetary gear set 52 to rotate, causing the second planetary carrier 54 and the first ring gear 38 to rotate, thereby driving the power output shaft 12 to rotate. The greater the torque of the power assist motor, the greater the torque of the power output shaft 12 transmitted to the power output shaft 12 through the second transmission mechanism 22, the fourth transmission mechanism 46, and the first transmission mechanism 20.

[0416] In the illustrated embodiment, the power input shaft 14 can be connected to the power output shaft 12 via a third transmission mechanism 44 and a first transmission mechanism 20. Specifically, the power input shaft 14 is connected to the first gear ring 38 of the first transmission mechanism 20 via the third transmission mechanism 44. The first gear ring 38 is connected to the first planetary gear set 40, and the first planetary gear set 40 is connected to the power output shaft 12 via the first planetary carrier 42. The power input shaft 14 receives torque input from the power input device 200, which can drive the third transmission mechanism 44 to move, thereby driving the first gear ring 38 to rotate. The first gear ring 38 drives the first planetary gear set 40 to rotate, causing the first planetary carrier 42 and the power output shaft 12 to rotate. The greater the torque of the power input shaft 14, the greater the torque of the power output shaft 12, as the power is transmitted to the power output shaft 12 through the third transmission mechanism 44 and the first transmission mechanism 20.

[0417] When the torque of the power input shaft 14 is insufficient, the torque of the power output shaft 12 can be assisted by the torque of the power assist device 18.

[0418] In some implementations, the torque of the power assist device 18 is adjusted according to the torque of the power input shaft 14.

[0419] Therefore, the torque requirement of the power output shaft 12 can be met by using the power assist device 18.

[0420] Specifically, the power assist unit 100 may include a controller and a torque sensor, and the power assist device 18 includes a power assist motor. The controller is electrically connected to the torque sensor and the power assist motor. The torque sensor can be used to detect the torque of the power input shaft 14 (such as the torque of the pedal). The controller adjusts the torque of the power assist device 18 according to the torque of the power input shaft 14 to meet the torque requirements of the power output shaft 12.

[0421] In some embodiments, the planetary gear transmission mechanism of the second transmission mechanism 22 includes a second sun gear 48, a second planet carrier 54, and a second ring gear 50. The planetary gear transmission mechanism of the first transmission mechanism 20 includes a first planet carrier 42.

[0422] (1) Let n2S2, n2R2, and n2C2 be the rotational speeds of the second sun gear 48, the second ring gear 50, and the second planetary carrier 54, respectively, and let α be the gear ratio or pitch circle radius ratio between the second ring gear 50 and the second sun gear 48.

[0423] (2) Let TS2, TR2, and TC2 be the torques of the second sun gear 48, the second ring gear 50, and the second planetary carrier 54, respectively, and let α be the gear ratio or pitch circle radius ratio between the second ring gear 50 and the second sun gear 48.

[0424] Rotational speed relationship: n2S2+α2×n2R2=(1+α2)×n2C2;

[0425] Torque relationship: TS2:TR2:TC2=1:α2:-(1+α2);

[0426] Since the second ring gear 50 is fixed, the second sun gear 48 is connected to the output shaft of the power assist device 18, and the second planetary carrier 54 is connected to the first ring gear 38 of the first transmission mechanism 20 through the fourth transmission mechanism 46, therefore: V 助力电机 =n2S2; T 助力电机 =TS2; V 助力电机 =n2S2=(1+α2)×n2C2; T 助力电机 :TC2=1:-(1+α2);

[0427] In conclusion:

[0428] When V 动力输入 >1 / (1+α2)×V 助力电机 At that time, V 调速电机+α1×V 动力输入 = (1+α1)×V 输出 (A); or

[0429] When V 动力输入 <1 / (1+α2)×V 助力电机 At that time, V 调速电机 +α1×(1 / (1+α2)×V 助力电机 )=(1+α1)×V 输出 (B1);

[0430] T 调速电机 :(T 动力输入 +(1+α2)×T 助力电机 ):T 动力输出 =1:α1:-(1+α1) (C)

[0431] When the power assist device 18 drives the speed regulating device 16 to rotate via the compensation transmission mechanism 24, the power assist unit 100 is in a fixed gear mode. In the fixed gear mode, the speed and torque of the speed regulating device 16 remain constant. As can be seen from formula C, when the torque T of the speed regulating device 16... 调速电 机 and the required torque T of the power output shaft 12 动力输出 At a certain time, the torque T of the power input shaft 14 can be used as a reference. 动力输入 Adjusting the torque T of the power assist device 18 助力电机 This is to meet the torque requirements of the power output shaft 12.

[0432] It is understood that in other embodiments, when the transmission mechanism adopts other types of structures to achieve power transmission, the mapping relationship between the torque of the power assist device 18, the torque of the power input shaft 14, and the torque of the power output shaft 12 can be established by combining the above analysis process.

[0433] In some embodiments, when the speed of the power input shaft 14 is greater than or equal to the speed of the power input shaft 14, since the power input shaft 14 and the power input motor are mechanically connected at a fixed speed ratio, the power input shaft 14 is connected to the third transmission mechanism 44 via a clutch 56 (such as a one-way bearing 30). When the power assist device 18 provides assistance, the clutch 56 conducts a transmission connection in which the power input shaft 14 drives a component (such as the first gear ring 38) of the first transmission mechanism 20 to rotate through the third transmission mechanism 44. The speed of the power input shaft 14 after deceleration to the first gear ring 38 is the same in magnitude and direction as the speed of the power input shaft 14 after acceleration to the first gear ring 38. When the power input device 200 suddenly stops inputting power (such as when a person suddenly stops pedaling), the speed of the assist motor cannot immediately become zero. At this time, the clutch 56 disconnects the transmission connection between the power input shaft 14 and the third transmission mechanism 44, which drives a component (such as the first gear ring 38) of the first transmission mechanism 20 to rotate. The speed of the assist motor is higher than the speed of the power input shaft 14 (such as the pedal frequency), ensuring that the assist motor does not drag the foot and cause an unpleasant experience.

[0434] In some implementations, in fixed-gear mode, for example, when the clutch 56 of the switching device 28 engages the transmission connection that drives the speed-regulating power unit 16 via the compensation transmission mechanism 24 at low vehicle speeds, the power assist unit 18 can compensate for torque to the speed-regulating power unit 16 through the compensation transmission mechanism 24, and can also compensate for insufficient torque of the power input shaft 14 at the first gear ring 38 through the fourth transmission mechanism 46. In shift mode, for example, when the clutch 56 of the switching device 28 disengages the transmission connection that drives the speed-regulating power unit 16 via the compensation transmission mechanism 24 at high vehicle speeds, the power assist unit 18 can compensate for insufficient torque of the power input shaft 14 at the first gear ring 38 through the fourth transmission mechanism 46. In this case, the torque of both the speed-regulating power unit 16 and the power assist motor can meet the system requirements.

[0435] In the illustrated embodiment, both the first transmission mechanism 20 and the second transmission mechanism 22 include planetary gear transmission mechanisms. The steering relationships of the components of the power input shaft 14, the power output shaft 12, the first transmission mechanism 20, and the second transmission mechanism 22 are shown in the table below.

[0436] The specific directions of rotation, both forward and reverse, can be determined according to requirements and are not limited here. It is understood that in other embodiments, the above-mentioned steering relationship can be changed by increasing or decreasing the number of constituent components and / or changing the structure, and this application is not limited to the steering relationship shown in the table above.

[0437] In some embodiments, the power input shaft 14 and the power output shaft 12 are arranged at intervals in a direction perpendicular to the power output shaft 12.

[0438] This allows for convenient spatial configuration of the other components of the assist unit 100.

[0439] Specifically, the power output shaft 12 is used to output power, and the power input shaft 14 is used to receive the power input from the power input device 200 and transmit the power to the power output shaft 12. The power input shaft 14 and the power output shaft 12 are arranged at intervals in a direction perpendicular to the power output shaft 12, so that the other components of the assist unit 100 can be spatially configured according to the positions of the power input shaft 14 and the power output shaft 12, which is beneficial to improving assembly efficiency.

[0440] In some embodiments, the speed regulating power device 16 is connected to the power output shaft 12 via the first transmission mechanism 20, and the power assist device 18 is connected to the first transmission mechanism 20 via the second transmission mechanism 22. Thus, the positions of the speed regulating power device 16, the power assist device 18, the first transmission mechanism 20, and the second transmission mechanism 22 can be configured according to the positions of the power output shaft 12 and the power input shaft 14.

[0441] In some embodiments, the extension direction of the power input shaft 14 is substantially parallel to the extension direction of the power output shaft 12.

[0442] This allows for a compact assist unit 100, which is beneficial for miniaturization design of the assist unit 100.

[0443] Specifically, the extension direction of the power input shaft 14 is substantially parallel to the extension direction of the power output shaft 12, which allows the power assist device 18 and the second transmission mechanism 22 to be arranged along the extension direction of the power input shaft 14, and the speed regulating power device 16 and the first transmission mechanism 20 to be arranged along the extension direction of the power output shaft 12.

[0444] Optionally, the power assist device 18 and at least part of the components of the second transmission mechanism 22 are mounted on the power input shaft 14, and the speed regulating power device 16 and the first transmission mechanism 20 are arranged along the extension direction of the power output shaft 12.

[0445] The extension direction of the power input shaft 14 is basically parallel to the extension direction of the power output shaft 12. Other components of the assist unit 100 can be arranged in two parallel positions, making the structural arrangement of the assist unit 100 more regular and enabling a compact assist unit 100, which is beneficial to the miniaturization design of the assist unit 100.

[0446] In some embodiments, the power input device 200 is coaxially connected to the power input shaft 14.

[0447] This allows for a compact assist unit 100, which is beneficial for miniaturization design of the assist unit 100.

[0448] Specifically, the power input device 200 is coaxially connected with the power input shaft 14, which can reduce the space occupied in the direction perpendicular to the extension direction of the power input shaft 14 caused by the eccentric connection between the power input device 200 and the power input shaft 14. This allows for a compact assist unit 100, which is beneficial for the miniaturization design of the assist unit 100.

[0449] The coaxial connection between the power input device 200 and the power input shaft 14 also facilitates the connection between the power input device 200 and the power input shaft 14.

[0450] In some embodiments, the power input device 200 includes at least one of the following: an electric motor, an engine, or a pedal crank mechanism.

[0451] Therefore, the application range of the assist unit 100 is quite wide.

[0452] Specifically, in some embodiments, the power input device 200 includes a motor, an engine, and a pedal crank mechanism. The output shaft of the motor can be connected to the power input shaft 14. The motor can consume electrical energy to rotate its output shaft, thereby driving the power input shaft 14 to rotate, thus realizing power input. The motor can be used in, but is not limited to, electric bicycles, electric motorcycles, and electric vehicles.

[0453] The engine's output shaft can be connected to the power input shaft 14. The engine consumes fuel to rotate its output shaft, which in turn drives the power input shaft 14 to rotate, thereby achieving power input. The engine can be used in, but is not limited to, electric bicycles, electric motorcycles, and electric vehicles.

[0454] The crankshaft of the pedal crank mechanism can be connected to the power input shaft 14. The rider can pedal the pedal connected to the crankshaft to rotate the crankshaft of the pedal crank mechanism, thereby driving the power input shaft 14 to rotate and thus input power. The pedal crank mechanism can be applied to bicycles, tricycles, etc.

[0455] In some embodiments, the power input device 200 includes any one or both of an electric motor, an engine, and a pedal crank mechanism.

[0456] In some embodiments, the power input device 200 is fixedly connected to the power input shaft 14.

[0457] This can improve transmission efficiency, simplify the structure of the power assist unit 100, and facilitate the miniaturization design of the power assist unit 100.

[0458] Specifically, the power input device 200 is fixedly connected to the power input shaft 14, which eliminates the need for a connecting mechanism that allows the power input device 200 and the power input shaft 14 to be movably connected. Typically, a movable connection requires more components than a fixed connection, and the structure of a movable connection is also more complex than that of a fixed connection.

[0459] The power input device 200 is fixedly connected to the power input shaft 14, which can reduce power loss caused by the movable connection between the power input device 200 and the power input shaft 14. Normally, when the connection is movable, the components of the connection mechanism will have relative movement, resulting in frictional loss, and the power will also be further lost due to the tolerances caused by the movable connection of the components of the connection mechanism.

[0460] The power input device 200 is fixedly connected to the power input shaft 14 by means including but not limited to welding, snap-fit, bolt connection, etc.

[0461] In some embodiments, the speed-regulating power unit 16 includes at least one of the following: an electric motor, an engine.

[0462] Therefore, the application range of the assist unit 100 is quite wide.

[0463] Specifically, in some embodiments, the speed-regulating power device 16 includes a motor and an engine. The output shaft of the motor can serve as the output shaft of the speed-regulating power device 16 and is connected to the first transmission mechanism 20. The motor can consume electrical energy to rotate its output shaft, thereby driving the first transmission mechanism 20 to move, which in turn drives the power output shaft 12 to rotate, thus achieving gear shifting.

[0464] The engine's output shaft can serve as the output shaft of the speed regulating power device 16, connected to the first transmission mechanism 20. The engine can consume fuel to rotate the engine's output shaft, thereby driving the first transmission mechanism 20 to move, which in turn drives the power output shaft 12 to rotate, thus achieving gear shifting.

[0465] In other embodiments, the speed-regulating power unit 16 includes an electric motor or an engine.

[0466] In some embodiments, the power assist device 18 includes at least one of the following: an electric motor, an engine.

[0467] Therefore, the application range of the assist unit 100 is quite wide.

[0468] Specifically, in some embodiments, the power assist device 18 includes a motor and an engine. The output shaft of the motor can serve as the output shaft of the power assist device 18, connected to the second transmission mechanism 22 and the compensation transmission mechanism 24. The motor can consume electrical energy to rotate its output shaft, thereby driving the second transmission mechanism 22 and the compensation transmission mechanism 24 to move, thus providing assistance to the power output shaft 12. When the relevant information of the power to be output by the speed regulating device 16 exceeds a preset limit, the motor drives the speed regulating device 16 to rotate through the compensation transmission mechanism 24.

[0469] The engine's output shaft can serve as the output shaft of the power assist device 18, connected to the second transmission mechanism 22 and the compensation transmission mechanism 24. The engine can consume fuel to rotate the engine's output shaft, thereby driving the second transmission mechanism 22 and the compensation transmission mechanism 24 to move, thus providing assistance to the power output shaft 12. When the relevant information of the power to be output by the speed regulating device 16 exceeds the preset limit, the engine can drive the speed regulating device 16 to rotate through the compensation transmission mechanism 24.

[0470] In other embodiments, the power assist device 18 includes an electric motor or an engine.

[0471] In some implementations, the vehicle to which the power assist unit 100 is applied is an electric-assisted bicycle, an electric motorcycle, or an electric car.

[0472] Therefore, vehicles have a wide range of applications.

[0473] Specifically, in some embodiments, the vehicle is an electric-assisted bicycle. The assist unit 100 can be mounted on the frame, with the power input shaft 14 connected to the crank and the power output shaft 12 connected to the rear wheel of the electric-assisted bicycle. In fixed-gear mode, the assist power unit 18 can drive the speed-regulating power unit 16 to rotate via the compensation transmission mechanism 24, thereby improving or eliminating the soft pedal feel caused by insufficient power output from the speed-regulating power unit 16. In shifting mode, the speed-regulating power unit 16 can adjust the speed of the power output shaft 12, thereby achieving continuously variable transmission (CVT) to improve or eliminate the jerking sensation during gear shifts.

[0474] In some embodiments, the vehicle is an electric motorcycle. The power assist unit 100 can be mounted on the frame, with the power input shaft 14 connected to the output shaft of the motor and the power output shaft 12 connected to the rear wheel of the electric motorcycle. In fixed-gear mode, the power assist unit 18 can drive the speed regulating power unit 16 to rotate via the compensation transmission mechanism 24, thereby improving or eliminating the soft feeling when pressing the accelerator pedal due to insufficient power output from the speed regulating power unit 16. In shift mode, the speed regulating power unit 16 can adjust the speed of the power output shaft 12, thereby achieving continuously variable transmission (CVT) to improve or eliminate the jerking sensation during gear shifts.

[0475] In some embodiments, the vehicle is an electric vehicle. The power assist unit 100 can be mounted on the vehicle body, with the power input shaft 14 connected to the output shaft of the vehicle's drive motor, and the power output shaft 12 connected to the electric vehicle's drive wheels (such as the rear wheels and / or front wheels). In fixed-gear mode, the power assist unit 18 can drive the speed regulating power unit 16 to rotate via the compensation transmission mechanism 24, thereby improving or eliminating the soft feeling when pressing the accelerator pedal due to insufficient power output from the speed regulating power unit 16. In shift mode, the speed regulating power unit 16 can adjust the speed of the power output shaft 12, thereby achieving continuously variable transmission (CVT) to improve or eliminate the jerking sensation during gear shifts.

[0476] Secondly, this application provides a vehicle.

[0477] Please also refer to Figure 7. The vehicle 10 of this embodiment includes:

[0478] Power input device 200; and

[0479] The assist unit 100 in any of the above embodiments is connected to the power input device 200 and is used to adjust the power input by the power input device 200.

[0480] It should be noted that the vehicle can be a land-based mobile device, such as a car, electric bicycle, or electric motorcycle; a water-based mobile device, such as a motorboat or speedboat; an air-based mobile device, such as an unmanned aerial vehicle or a manned aircraft; or a water-based mobile device, such as an unmanned underwater vehicle.

[0481] In some embodiments, the vehicle 10 further includes a driving device 300, which is connected to the power output shaft 12 of the power assist unit 100. The power output shaft 12 of the power assist unit 100 drives the power actuation component of the driving device 300 to rotate, thereby driving the vehicle to move. For example, the driving device 300 can be a wheel, a propeller, etc.

[0482] It should be noted that the above explanation of the implementation method and beneficial effects of the power assist unit 100 also applies to the vehicle of this embodiment. To avoid redundancy, it will not be elaborated in detail here.

[0483] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0484] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A power assist unit, characterized in that, include: The power take-off shaft is used to output power. A power input shaft is used to receive power input from a power input device and transmit power to the power output shaft. A speed-regulating power device, connected to the power output shaft via a first transmission mechanism, is used to adjust the rotational speed of the power output shaft; and The power assist device, connected to the first transmission mechanism via a second transmission mechanism, is used to provide assistance to the power output shaft. The power assist device is connected to the speed regulating device via a compensation transmission mechanism. When the relevant information of the power to be output by the speed regulating power device exceeds a preset limit, the assist power device can drive the speed regulating power device to rotate through the compensation transmission mechanism.

2. The assist unit according to claim 1, characterized in that, The relevant information of the power to be output by the speed regulating power device includes at least one of the following: the magnitude of the torque to be output by the speed regulating power device, the magnitude of the power to be output by the speed regulating power device, and the magnitude of the energy to be supplied by the speed regulating power device.

3. The assist unit according to claim 2, characterized in that, The amount of energy to be supplied by the speed-regulating power device includes at least one of the following: the amount of current to be supplied by the speed-regulating power device.

4. The assist unit according to claim 1, characterized in that, The information related to the output power of the speed regulating power device exceeding the preset limit includes at least one of the following: The output torque of the speed regulating power device is greater than the preset torque limit. The output power of the speed regulating power device is greater than the preset power limit. The current to be supplied to the speed regulating power device is greater than the preset current limit.

5. The assist unit according to claim 1, characterized in that, The power assist unit has two operating modes: a shift mode and a fixed mode. When the power assist device drives the speed regulating device to rotate through the compensation transmission mechanism, the power assist unit is in the fixed mode. When the transmission connection between the power assist device and the speed regulating device is disconnected, the power assist unit is in the shift mode.

6. The assist unit according to claim 5, characterized in that, In response to the power assist unit meeting preset conditions, the power assist unit switches from the fixed gear mode to the variable gear mode.

7. The assist unit according to claim 6, characterized in that, The response to the assist unit meeting preset conditions includes: the response to the working state of the speed regulating power device meeting preset conditions.

8. The assist unit according to claim 7, characterized in that, The response to the operating state of the speed-regulating power device satisfying the preset conditions includes at least one of the following: the output torque of the speed-regulating power device is less than or equal to a preset torque value, and the rotational speed of the speed-regulating power device is greater than or equal to a preset speed value.

9. The assist unit according to claim 6, characterized in that, The assist unit also includes a switching device, which is used to connect or disconnect the transmission connection between the assist power device and the speed regulating power device through the compensation transmission mechanism.

10. The assist unit according to claim 9, characterized in that, The switching device includes a clutch. In response to the assist unit meeting a preset condition, the clutch automatically disconnects the transmission connection between the assist power device and the speed regulating power device, which is driven to rotate by the compensation transmission mechanism.

11. The assist unit according to claim 10, characterized in that, The clutch includes a one-way bearing.

12. The assist unit according to claim 11, characterized in that, The one-way bearing is connected to the output shaft of the speed regulating power device, and the compensation transmission mechanism is connected to the power input shaft through the one-way bearing.

13. The assist unit according to claim 5, characterized in that, When the power assist unit is in the fixed gear mode, the transmission ratio of the power input to the power output of the power assist unit is a constant value.

14. The assist unit according to claim 5, characterized in that, When the power assist unit is in the gear shifting mode, the transmission ratio of the power input to the power output of the power assist unit changes with the rotational speed of the speed regulating power device.

15. The assist unit according to claim 14, characterized in that, When the power assist unit is in the gear shifting mode, the gear of the power assist unit increases as the rotational speed of the speed regulating power device increases.

16. The assist unit according to claim 1, characterized in that, The compensation transmission mechanism includes at least one of the following: a mechanical transmission mechanism, a hydraulic transmission mechanism, a magnetic transmission mechanism, a fluid transmission mechanism, and an electromagnetic transmission mechanism.

17. The assist unit according to claim 16, characterized in that, The mechanical transmission mechanism includes at least one of the following: a gear transmission mechanism, a wheel transmission mechanism, and a worm gear transmission mechanism.

18. The assist unit according to claim 17, characterized in that, The wheel transmission mechanism includes two transmission wheels and a connecting member. One of the transmission wheels is connected to the output shaft of the speed regulating power device, and the other transmission wheel is connected to the output shaft of the power assist device. The connecting member is connected to both transmission wheels to drive the two transmission wheels to rotate together.

19. The assist unit according to claim 18, characterized in that, The transmission wheel includes at least one of the following: a belt pulley, a sprocket; The connector includes at least one of the following: a belt, a chain.

20. The assist unit according to claim 1, characterized in that, The first transmission mechanism includes a gear transmission mechanism, which includes multiple gear components. The output shaft of the speed regulating power device is connected to one of the gear components, and the power output shaft is connected to another gear component.

21. The assist unit according to claim 20, characterized in that, The gear transmission mechanism includes a planetary gear transmission mechanism, which includes a sun gear, a ring gear, a planetary gear set, and a planet carrier. The sun gear is located inside the ring gear, and the planetary gear set is located between the inner ring of the ring gear and the outer ring of the sun gear. The planetary gear set meshes with both the ring gear and the sun gear. The planet carrier is connected to the middle of the planetary gears in the planetary gear set, and the rotation of the planetary gears can drive the planet carrier to rotate.

22. The assist unit according to claim 21, characterized in that, The planetary gear set includes multiple sets of planetary gears, one set of which meshes with the sun gear, and another set of which meshes with the ring gear.

23. The assist unit according to claim 22, characterized in that, One set of planetary gears may have the same or different number of teeth as another set of planetary gears.

24. The assist unit according to claim 21, characterized in that, The output shaft of the speed-regulating power device is connected to the sun gear or the planetary carrier.

25. The assist unit according to claim 21, characterized in that, The power output shaft is connected to the planet carrier or the sun gear.

26. The assist unit according to claim 21, characterized in that, The gear ring is connected to the power input shaft via a third transmission mechanism.

27. The assist unit according to claim 26, characterized in that, One of the sun gear or the planetary carrier is connected to the output shaft of the speed regulating power device, and the other is connected to the power output shaft.

28. The assist unit according to claim 26, characterized in that, The gear ring is connected to the second transmission mechanism via a fourth transmission mechanism.

29. The assist unit according to claim 1, characterized in that, The second transmission mechanism includes a gear transmission mechanism, which includes multiple gear components. The output shaft of the power assist device is connected to one of the gear components, and the first transmission mechanism is connected to the other gear component.

30. The assist unit according to claim 29, characterized in that, The gear transmission mechanism includes a planetary gear transmission mechanism, which includes a sun gear, a ring gear, a planetary gear set, and a planet carrier. The sun gear is located inside the ring gear, and the planetary gear set is located between the inner ring of the ring gear and the outer ring of the sun gear. The planetary gear set meshes with both the ring gear and the sun gear. The planet carrier is connected to the middle of the planetary gears in the planetary gear set, and the rotation of the planetary gears can drive the planet carrier to rotate.

31. The assist unit according to claim 30, characterized in that, The planetary gear set includes multiple sets of planetary gears, one set of which meshes with the sun gear, and another set of which meshes with the ring gear.

32. The assist unit according to claim 31, characterized in that, One set of planetary gears may have the same or different number of teeth as another set of planetary gears.

33. The assist unit according to claim 30, characterized in that, The output shaft of the power assist device is connected to the sun gear or the planetary carrier.

34. The assist unit according to claim 30, characterized in that, The first transmission mechanism is connected to the planet carrier or the sun gear.

35. The assist unit according to claim 30, characterized in that, The gear ring is fixed and does not rotate.

36. The assist unit according to claim 35, characterized in that, One of the sun gear or the planetary carrier is connected to the output shaft of the power assist device, and the other is connected to the first transmission mechanism.

37. The assist unit according to claim 1, characterized in that, The power assist unit also includes a third transmission mechanism, through which the power input shaft drives a component of the first transmission mechanism to rotate.

38. The assist unit according to claim 37, characterized in that, The third transmission mechanism includes at least one of the following: a mechanical transmission mechanism, a hydraulic transmission mechanism, a magnetic transmission mechanism, a fluid transmission mechanism, and an electromagnetic transmission mechanism.

39. The assist unit according to claim 38, characterized in that, The mechanical transmission mechanism includes at least one of the following: a gear transmission mechanism, a wheel transmission mechanism, and a worm gear transmission mechanism.

40. The assist unit according to claim 39, characterized in that, The wheel transmission mechanism includes two transmission wheels and a transmission component. One of the transmission wheels is connected to the power input shaft, and the other transmission wheel is connected to the first transmission mechanism. The transmission component is connected to both transmission wheels to drive the two transmission wheels to rotate together.

41. The assist unit according to claim 40, characterized in that, The transmission wheel includes at least one of the following: a belt pulley, a sprocket; The transmission component includes at least one of the following: a belt, a chain.

42. The assist unit according to claim 1, characterized in that, The assist unit also includes a fourth transmission mechanism, through which the second transmission mechanism drives a component of the first transmission mechanism to rotate.

43. The assist unit according to claim 42, characterized in that, The fourth transmission mechanism includes at least one of the following: a mechanical transmission mechanism, a hydraulic transmission mechanism, a magnetic transmission mechanism, a fluid transmission mechanism, and an electromagnetic transmission mechanism.

44. The assist unit according to claim 43, characterized in that, The mechanical transmission mechanism includes at least one of the following: a gear transmission mechanism, a wheel transmission mechanism, and a worm gear transmission mechanism.

45. The assist unit according to claim 44, characterized in that, The wheel transmission mechanism includes two transmission wheels and a transmission component. One of the transmission wheels is connected to the second transmission mechanism, and the other transmission wheel is connected to the first transmission mechanism. The transmission component is connected to both transmission wheels to drive the two transmission wheels to rotate together.

46. ​​The assist unit according to claim 45, characterized in that, The transmission wheel includes at least one of the following: a belt pulley, a sprocket; The transmission component includes at least one of the following: a belt, a chain.

47. The assist unit according to claim 1, characterized in that, The power input shaft also includes a clutch. The power input shaft drives a component of the first transmission mechanism to rotate through a third transmission mechanism. The clutch is used to disconnect or connect the transmission connection in which the power input shaft drives a component of the first transmission mechanism to rotate through the third transmission mechanism.

48. The assist unit according to claim 47, characterized in that, The clutch includes a one-way bearing.

49. The assist unit according to claim 48, characterized in that, The one-way bearing is connected to the power input shaft, and the third transmission mechanism is connected to the power input shaft through the one-way bearing.

50. The assist unit according to claim 48, characterized in that, When the speed of the third transmission mechanism is greater than the speed of the power input shaft, the one-way bearing disconnects the transmission connection between the power input shaft and the third transmission mechanism, which drives a component of the first transmission mechanism to rotate.

51. The assist unit according to claim 1, characterized in that, The output shaft of the power assist device is a hollow shaft, and the power input shaft passes through the output shaft of the power assist device.

52. The assist unit according to claim 51, characterized in that, The output shaft of the power assist device can rotate relative to the power input shaft.

53. The assist unit according to claim 52, characterized in that, A bearing is provided between the output shaft of the power assist device and the power input shaft.

54. The assist unit according to claim 1, characterized in that, The power assist device and at least some of the components of the second transmission mechanism are arranged along the extension direction of the power input shaft.

55. The assist unit according to claim 54, characterized in that, At least some of the components of the second transmission mechanism are mounted on the power input shaft.

56. The assist unit according to claim 54, characterized in that, The power assist device is mounted on the power input shaft.

57. The assist unit according to claim 54, characterized in that, The output shaft of the power assist device is coaxially arranged with the power input shaft.

58. The assist unit according to claim 1, characterized in that, The speed-regulating power device and at least some of the components of the first transmission mechanism are arranged along the extension direction of the power output shaft.

59. The assist unit according to claim 58, characterized in that, At least some of the components of the first transmission mechanism are fitted onto the extension of the power output shaft.

60. The assist unit according to claim 58, characterized in that, The output shaft of the speed regulating power device is coaxially arranged with the power output shaft.

61. The assist unit according to claim 1, characterized in that, The rotational speed of the power output shaft increases as the rotational speed of the speed regulating power device and / or the rotational speed of the power input shaft increases.

62. The assist unit according to claim 61, characterized in that, The speed of the speed regulating power device is adjusted according to the speed of the power input shaft.

63. The assist unit according to claim 1, characterized in that, The torque of the power output shaft increases as the torque of the power assist device and the torque of the power input shaft increase.

64. The assist unit according to claim 63, characterized in that, The torque of the power assist device is adjusted according to the torque of the power input shaft.

65. The assist unit according to claim 1, characterized in that, The power input shaft and the power output shaft are arranged at intervals in a direction perpendicular to the power output shaft.

66. The assist unit according to claim 65, characterized in that, The extension direction of the power input shaft is substantially parallel to the extension direction of the power output shaft.

67. The assist unit according to claim 1, characterized in that, The assist unit also includes a power input device, which is coaxially connected to the power input shaft.

68. The assist unit according to claim 67, characterized in that, The power input device includes at least one of the following: an electric motor, an engine, and a foot crank mechanism.

69. The assist unit according to claim 67, characterized in that, The power input device is fixedly connected to the power input shaft.

70. The assist unit according to claim 1, characterized in that, The speed-regulating power device includes at least one of the following: an electric motor, an engine.

71. The assist unit according to claim 1, characterized in that, The power assist device includes at least one of the following: an electric motor, an engine.

72. The assist unit according to claim 1, characterized in that, The vehicle to which the assist unit is applied is an electric-assisted bicycle, an electric motorcycle, or an electric car.

73. A vehicle, characterized in that, include: Power input device; as well as The assist unit according to any one of claims 1-72, wherein the assist unit is connected to the power input device and is used to adjust the power input by the power input device.

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