Power system for electric power-assisted bicycle and electric power-assisted bicycle

Abstract

The invention belongs to the technical field of bicycles, and discloses a power system for an electric power-assisted bicycle and the electric power-assisted bicycle, the power system comprises a pedal shaft, a manpower transmission wheel, a total output wheel, an electric speed regulation device and an electric power assisting device, the manpower transmission wheel is in coaxial transmission connection with the pedal shaft, and the total output wheel is in transmission connection with a rear wheel of the bicycle; the electric speed regulation device and the electric power assisting device are used for providing a transmission ratio and electric assisting power matched with the electric speed regulation device and the electric power assisting device on the basis of pedaling force and pedaling frequency of a rider so as to realize stepless speed change and electric power assisting riding; the power-assisted second transmission wheel is coaxially and fixedly connected with the speed regulation gear ring, the power-assisted first transmission wheel is in transmission connection with an output shaft of the power-assisted motor, and the power-assisted first transmission wheel is meshed with the power-assisted second transmission wheel and the manpower transmission wheel at the same time, so that the power of a rider and the power of the power-assisted motor share one power-assisted second transmission wheel, and the power of the rider is saved. Power is transmitted to the speed regulation gear ring, the gear transmission structure is simplified, the manufacturability of products is improved, and the machining cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of bicycles, and in particular to a power system for an electric-assisted bicycle and an electric-assisted bicycle. Background Art

[0002] Existing electric-assisted bicycles provide riding assistance to riders through the power system, but the transmission system still uses the mechanical transmission of traditional bicycles, which means that riders still need to frequently manually shift gears to adapt to different riding conditions during riding, and the gear shift shock caused by mechanical transmission always exists.

[0003] In related technologies, for power systems that utilize dual motors to achieve continuously variable speeds and power assistance, the rider's pedaling force is input through the pedal shaft. The speed regulating motor and the power assist motor match different transmission ratios and power assist based on the rider's pedaling force and pedaling frequency, ultimately transmitting power to the chainring, which in turn transmits it to the bicycle's rear wheel. During this power transmission process, the pedaling force and the output shaft of the power assist motor each require transmission assemblies. This results in a complex power transmission design, high processing costs, and poor manufacturability.

[0004] This section provides background information related to the present application which is not necessarily prior art. Summary of the Invention

[0005] The purpose of this application is to solve or at least alleviate some or all of the above-mentioned problems. To this end, the purpose of this application is to provide a power system for an electric power-assisted bicycle and an electric power-assisted bicycle, which, through a reasonable layout, can transmit the power of the pedaling force and the power-assisted motor through a common gear, thereby simplifying the gear transmission structure, improving the manufacturability of the product, and reducing processing costs.

[0006] In order to achieve the above objectives, this application adopts the following technical solutions:

[0007] In a first aspect, the present application provides a power system for an electric-assisted bicycle, comprising:

[0008] pedal shaft;

[0009] A human-powered transmission wheel, coaxially connected to the pedal shaft;

[0010] An electric speed regulating device, comprising a speed regulating motor and a speed regulating planetary gear mechanism, wherein the speed regulating planetary gear mechanism comprises a speed regulating sun gear, a speed regulating planetary gear and a speed regulating ring gear, and the speed regulating motor is coaxially connected to the speed regulating sun gear;

[0011] The electric power-assist device comprises a power-assist motor, a first power-assist transmission wheel, and a second power-assist transmission wheel, wherein the second power-assist transmission wheel is coaxially fixedly connected to the speed regulating ring gear, the power-assist motor is in transmission connection with the first power-assist transmission wheel, and the first power-assist transmission wheel is simultaneously meshed with the second power-assist transmission wheel and the human power transmission wheel;

[0012] The total output wheel is used for driving connection with the rear wheel of the bicycle, and the speed regulating planetary wheel is drivingly connected with the total output wheel.

[0013] As an optional solution for the power system of the electric assisted bicycle, the electric speed control device also includes a speed control transmission assembly, which includes a speed control driving wheel and a speed control driven wheel, and the speed control driving wheel is connected to the speed control driven wheel through transmission; the speed control driving wheel is coaxially connected to the speed control planetary wheel, and the speed control driven wheel is coaxially connected to the total output wheel through transmission.

[0014] As an optional solution for the power system of the electric assisted bicycle, when the number of the speed regulating planetary gear mechanisms is two or more, each of the speed regulating planetary gear mechanisms is arranged in sequence along the extension direction of the output shaft of the speed regulating motor, and the speed regulating sun gear of the first speed regulating planetary gear mechanism is transmission connected to the output shaft of the speed regulating motor; in two adjacent speed regulating planetary gear mechanisms, the speed regulating planet carrier of the speed regulating planetary gear mechanism close to the speed regulating motor is coaxially transmission connected to the speed regulating sun gear of the other speed regulating planetary gear mechanism; the speed regulating planet gear of the last speed regulating planetary gear mechanism is transmission connected to the total output wheel through the speed regulating transmission assembly, and the speed regulating ring gear of the last speed regulating planetary gear mechanism is transmission connected to the output shaft of the power assist motor.

[0015] As an optional solution for the power system of the electric-assisted bicycle, the human-powered transmission wheel and the pedal shaft are coaxially connected via a first clutch, and the speed-adjusting driven wheel and the human-powered transmission wheel are coaxially connected via a second clutch; or

[0016] The human-powered transmission wheel and the pedal shaft are coaxially connected via a first clutch, and the speed-adjusting driven wheel and the pedal shaft are coaxially connected via a third clutch; or

[0017] The human-powered transmission wheel and the pedal shaft are coaxially connected via a first clutch, the speed-regulating driven wheel is rotationally coupled with the pedal shaft, the power system for the electric-assisted bicycle further comprises a housing, the speed-regulating sun wheel is rotatably mounted on the housing, and a fourth clutch is provided between the speed-regulating sun wheel and the housing; or

[0018] The human-powered transmission wheel and the pedal shaft are coaxially connected via a first clutch, and the planetary wheel carrier of the speed-regulating planetary wheel and the speed-regulating ring gear are connected via a fifth clutch.

[0019] As an optional solution for the power system of the electric-assisted bicycle, the total output wheel is coaxially arranged with the pedal shaft.

[0020] As an optional solution for the power system of the electric power-assisted bicycle, the power-assisted first transmission wheel is coaxially and directly connected to the output shaft of the power-assisted motor.

[0021] As an optional solution for the power system of the electric assisted bicycle, the electric assisted device also includes a power assisted planetary gear mechanism, which includes a power assisted sun gear, a power assisted planetary gear and a power assisted ring gear. The power system of the electric assisted bicycle also includes a housing, the power assisted ring gear is fixed to the housing, the power assisted motor is coaxially connected to the power assisted sun gear, and the power assisted planetary gear is coaxially connected to the power assisted first transmission wheel.

[0022] As an optional solution for the power system of the electric power-assisted bicycle, the power-assisted planetary gear includes a planetary wheel carrier and a planetary wheel set, the planetary wheel carrier is coaxially connected to the power-assisted first transmission wheel; the number of the planetary wheel set is one group, and the planetary wheel set is simultaneously engaged with the power-assisted sun gear and the power-assisted ring gear; or

[0023] The power-boosting planetary gear includes a planetary gear carrier, a planetary gear set and a connecting shaft, and the planetary gear carrier is coaxially connected to the power-boosting first transmission wheel; there are two planetary gear sets, and both sets of planetary gear sets include planetary gears, and the number of planetary gears in each planetary gear set is the same as the number of the connecting shafts, and the corresponding planetary gears in the two sets of planetary gear sets are respectively connected to the two ends of the connecting shaft, wherein one set of planetary gear sets is engaged with the power-boosting sun gear, and the other set of planetary gear sets is engaged with the power-boosting ring gear.

[0024] As an optional solution for the power system of the electric power-assisted bicycle, the first power-assisted transmission wheel is not coaxial with the output shaft of the power-assisted motor, and the electric power-assisted device further includes a third power-assisted transmission wheel, which is coaxially connected to the output shaft of the power-assisted motor and meshes with the first power-assisted transmission wheel; or

[0025] The first power-assisting transmission wheel is not coaxial with the output shaft of the power-assisting motor, and the electric power-assisting device also includes a third power-assisting transmission wheel and a fourth power-assisting transmission wheel. The third power-assisting transmission wheel is coaxially connected to the output shaft of the power-assisting motor and meshes with the fourth power-assisting transmission wheel. The fourth power-assisting transmission wheel is coaxially and fixedly connected to the first power-assisting transmission wheel.

[0026] In a second aspect, the present application provides an electric-assisted bicycle, comprising a frame and a power system for an electric-assisted bicycle as described in any one of the above items, wherein the power system for an electric-assisted bicycle is installed on the frame.

[0027] The beneficial effects of this application are:

[0028] The power system provided in the present application includes a pedal shaft, a human-powered transmission wheel, a total output wheel, an electric speed control device and an electric power-assisting device, wherein the power-assisting second transmission wheel is coaxially fixedly connected to the speed-regulating ring gear, the power-assisting first transmission wheel is transmission-connected to the output shaft of the power-assisting motor, and the power-assisting first transmission wheel is simultaneously engaged with the power-assisting second transmission wheel and the human-powered transmission wheel, thereby achieving the goal of allowing the rider's power and the power of the power-assisting motor to share the same power-assisting second transmission wheel, transmitting the power to the speed-regulating ring gear, simplifying the gear transmission structure, improving the manufacturability of the product, and reducing processing costs.

[0029] In addition, the electric speed control device uses one, two, or more speed-regulating planetary gear mechanisms, each comprising a speed-regulating sun gear, a speed-regulating planetary gear, and a speed-regulating ring gear. The speed-regulating motor is coaxially connected to the speed-regulating sun gear, and the speed of the speed-regulating ring gear is determined by the rider's pedaling frequency. When the speeds of the speed-regulating sun gear and the speed-regulating ring gear are determined, the speed of the speed-regulating planetary gear is also determined. The speed-regulating planetary gear is connected to the main output wheel, thereby transmitting power to the main output wheel. In this case, as the rider's pedaling frequency increases, the speed of the rear wheel can be changed by changing the speed of the speed-regulating motor output, thereby achieving stepless speed change. Compared to mechanical gear shifting, this can avoid the shift shock caused by the shifting process. When two or more speed-regulating planetary gear mechanisms are used, the maximum transmission ratio of the entire system can be further increased, avoiding the phenomenon of slipping caused by excessive pedaling force.

[0030] In addition, the electric power-assisted device can use a power-assisted planetary gear mechanism, which includes a power-assisted sun gear, power-assisted planetary gears, and a power-assisted ring gear. The power system for the electric power-assisted bicycle also includes a housing, the power-assisted ring gear is fixed to the housing, the power-assisted motor is coaxially connected to the power-assisted sun gear, and the power-assisted planetary gear is coaxially connected to the power-assisted first transmission wheel. This arrangement can reduce the speed of the power-assisted motor and increase the torque, improving the power-assisted effect, making the electric power-assisted bicycle suitable for use in complex road conditions such as mountainous terrain.

[0031] In addition, a four-axis transmission scheme can be adopted in the electric power assist device, in which the first power assist transmission wheel is not coaxial with the output shaft of the power assist motor. The electric power assist device also includes a third power assist transmission wheel and / or a fourth power assist transmission wheel. The third power assist transmission wheel is coaxially connected to the output shaft of the power assist motor, and is connected to the first power assist transmission wheel through the fourth power assist transmission wheel.

[0032] In addition, the total output wheel and the pedal shaft can be coaxially arranged, and the components of the electric power assist device and the electric speed control device are independently arranged on the pedal shaft, which can reduce the number of components connected to the pedal shaft, so that the pedal shaft and its related components can be used for the frame and other external components of an ordinary electric power assist bicycle without the need to redevelop and design new frames and other external components, thereby reducing product costs.

[0033] The electric power-assisted bicycle provided in the present application, by applying the above-mentioned power system, can transmit the pedaling force and the power of the power-assisted motor through a common gear, thereby simplifying the gear transmission structure, improving the manufacturability of the product, and reducing processing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present application and these drawings without any creative work.

[0035] Figure 1 It is a schematic structural diagram of the electric-assisted bicycle provided in an embodiment of the present application.

[0036] Figure 2 It is a structural diagram of the power system of the first example provided in the embodiment of the present application.

[0037] Figure 3 This is a schematic diagram of the relationship between cadence and vehicle speed under different circumstances provided by an embodiment of the present application.

[0038] Figure 4 This is a schematic diagram of the spatial layout of the power-assisted first transmission wheel, the power-assisted second transmission wheel and the human-powered transmission wheel provided in an embodiment of the present application.

[0039] Figure 5 It is a structural diagram of the power system of the second example provided in an embodiment of the present application.

[0040] Figure 6 It is a structural diagram of the power system of the third example provided in the embodiment of the present application.

[0041] Figure 7 It is a structural diagram of the power system of the fourth example provided in an embodiment of the present application.

[0042] Figure 8 It is a structural diagram of the power system of the fifth example provided in the embodiment of the present application.

[0043] Figure 9 It is a structural diagram of the sixth example power system provided in an embodiment of the present application.

[0044] Figure 10 It is a structural diagram of the power system of the seventh example provided in the embodiment of the present application.

[0045] Figure 11 It is a structural diagram of the power system of the eighth example provided in the embodiment of the present application.

[0046] Figure 12 It is a structural diagram of the ninth example power system provided in the embodiment of the present application.

[0047] Reference numerals:

[0048] 100, frame; 200, front wheel; 300, rear wheel; 400, crank; 500, pedal; 600, housing;

[0049] 1. Pedal shaft;

[0050] 2. Human-powered transmission wheel;

[0051] 31. Speed ​​regulating motor;

[0052] 32. Speed ​​regulating planetary gear mechanism; 321. Speed ​​regulating sun gear; 322. Speed ​​regulating planetary gear; 323. Speed ​​regulating ring gear;

[0053] 33. Speed ​​regulating transmission assembly; 331. Speed ​​regulating driving wheel; 332. Speed ​​regulating driven wheel;

[0054] 41. Power-assisted motor;

[0055] 42. Assist the first transmission wheel;

[0056] 43. Assist the second transmission wheel;

[0057] 44. Power-assisted planetary gear mechanism; 441. Power-assisted sun gear; 442. Power-assisted planetary gear; 4421. Planetary gear carrier; 4422. Planetary gear set; 4422a. First planetary gear set; 4422b. Second planetary gear set; 4423. Connecting shaft; 443. Power-assisted ring gear;

[0058] 451, assisting the third transmission wheel; 452, assisting the fourth transmission wheel;

[0059] 5. Main output wheel;

[0060] 61. First clutch;

[0061] 62. Second clutch;

[0062] 63. Third clutch;

[0063] 64. Fourth clutch;

[0064] 65. Fifth clutch. DETAILED DESCRIPTION

[0065] Before any embodiments of the present application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the foregoing drawings.

[0066] In this application, the terms "comprises," "includes," "has," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0067] In this application, the term "and / or" describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Additionally, the character " / " in this application generally indicates that the related objects are in an "and / or" relationship.

[0068] In this application, the terms "connect," "combine," "couple," and "install" may refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without an intermediary, and an indirect connection refers to two parts or components being connected to at least one intermediary, with the two parts or components being connected via the intermediary. Furthermore, "connect" and "couple" are not limited to physical or mechanical connections or couplings and may include electrical connections or couplings.

[0069] In this application, it will be understood by those skilled in the art that relative terms (e.g., "about," "approximately," "substantially," etc.) used in conjunction with quantities or conditions are inclusive of the stated value and have the meaning indicated by the context. For example, such relative terms include at least the degree of error associated with the measurement of the specified value, tolerances associated with the specified value caused by manufacturing, assembly, and use, etc. In addition, "substantially" when expressing a relative angular position relationship (e.g., substantially parallel, substantially perpendicular) may refer to plus or minus a certain number of degrees (e.g., 1 degree, 5 degrees, 10 degrees, or more) based on the indicated angle.

[0070] In this application, it will be understood by those skilled in the art that the function performed by an assembly can be performed by one assembly, multiple assemblies, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one assembly, or a combination of multiple parts.

[0071] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to the other element "upper" or "lower", but also be indirectly connected to the other element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, below can include directly below, lower left, lower right, lower front and lower back, etc.

[0072] like Figure 1 As shown, the present application provides an electric-assisted bicycle, comprising a frame 100, a front wheel 200, a rear wheel 300, a crank 400, a pedal 500, and a power system. The front wheel 200 and the rear wheel 300 are rotatably mounted on the frame 100, respectively. The power system is mounted on the frame 100, and one end of the crank 400 is connected to the power system, while the other end of the crank 400 is connected to the pedal 500. When a rider steps on the pedal 500, the power system provides corresponding auxiliary power in accordance with the rider's pedaling force, thereby cooperating with human power to drive the rear wheel 300 to rotate, thereby driving the power-assisted bicycle forward.

[0073] In the related art, a dual-motor system is used to realize a power system with continuously variable speed. However, due to the unreasonable internal design of the power system and the scattered distribution of parts, it is often necessary to make the input shaft (pedal 500 connecting shaft 4423) and the output shaft (chainwheel connecting shaft) of the power system not coaxial, or to set two output shafts in order to realize the continuously variable speed function. This not only causes the power system to occupy a large space and have a low power density; but also the above two designs are too different from the existing electric power-assisted bicycle structure in appearance and structure, making it difficult to be compatible with the existing electric power-assisted bicycle frame 100, chainwheel and other external components, resulting in the need to redevelop matching external components, which is costly and difficult for consumers to accept. In addition, in this power system, the pedaling force and the output of the power-assisted motor 41 need to be set up with transmission components for power transmission, which makes the power transmission design more complicated, the processing cost is high, and the manufacturability is poor.

[0074] In order to solve or alleviate the above problems, Figures 2 to 12As shown, the present application also provides a power system that can achieve stepless speed change and avoid gear shifting shock; by coaxially arranging the input shaft and the output shaft, it can be adapted to the external components of existing electric power-assisted bicycles without the need to redevelop external components that match them; by optimizing the power transmission structure of the pedaling force and the power-assisted motor 41, the power transmission of the pedaling force and the power-assisted motor 41 can share a gear transmission, simplifying the gear transmission structure, improving the manufacturability of the product, and reducing processing costs.

[0075] like Figure 2 As shown, the power system provided by the present application includes a pedal shaft 1, a human-powered transmission wheel 2, a total output wheel 5, an electric speed regulating device and an electric power assist device, wherein the pedal shaft 1 is the input shaft of the power system, the total output wheel 5 is used for transmission connection with the rear wheel 300 of the bicycle, and the human-powered transmission wheel 2 is coaxially connected to the pedal shaft 1 for power transmission to the rider; the electric speed regulating device is used to provide a transmission ratio that matches the rider's pedaling force and pedaling frequency to achieve stepless speed change; the electric power assist device is used to provide an electric power assist that matches the rider's pedaling force and pedaling frequency to reduce the rider's fatigue, and at the same time expand the use scenarios of electric power assist bicycles, such as mountain riding.

[0076] In addition, the power system also includes sensors, including a torque sensor and a cadence magnetic ring. The torque sensor is used to collect the rider's pedaling torque, and the cadence magnetic ring is used to detect the rider's cadence data.

[0077] It should be noted that the main output wheel 5 is connected to the rear wheel 300 via a chain or synchronous belt transmission. For example, the main output wheel 5 can be a sprocket, such as a crankset, in which case the main output wheel 5 and the rear wheel 300 are connected via a chain transmission. For another example, the main output wheel 5 can be a pulley, in which case the main output wheel 5 and the rear wheel 300 are connected via a synchronous belt transmission.

[0078] To achieve continuously variable speeds, the electric speed control device includes a speed regulating motor 31 and a speed regulating planetary gear mechanism 32. The speed regulating planetary gear mechanism 32 includes a speed regulating sun gear 321, a speed regulating planetary gear 322, and a speed regulating ring gear 323. The speed regulating motor 31 is coaxially connected to the speed regulating sun gear 321. The speed of the speed regulating ring gear 323 is determined by the rider's pedaling frequency. When the speeds of the speed regulating sun gear 321 and the speed regulating ring gear 323 are determined, the speed of the speed regulating planetary gear 322 is also determined. The speed regulating planetary gear 322 is in a driving connection with the main output wheel 5, thereby transmitting power to the main output wheel 5. In this case, as the rider's pedaling frequency increases, the speed of the rear wheel 300 can be changed by changing the speed of the speed regulating motor 31, thereby achieving continuously variable speeds. Compared to mechanical gear shifting, this can avoid the shift shock caused during the shifting process.

[0079] To better understand the differences between continuously variable transmission, mechanical gearshift, and no gearshift function, see Figure 3 The diagram shows the relationship between cadence and vehicle speed under different circumstances. In the case of no speed change, in order to continuously increase the vehicle speed, the rider needs to continuously increase the cadence, that is, the cadence and vehicle speed are in a linear relationship without the speed change function, and the rider's cadence is limited, so that the speed of the bicycle cannot be increased indefinitely. In the case of mechanical gear shifting, the rider can change the relationship between cadence and vehicle speed by shifting gears, so as to increase the vehicle speed while reducing or keeping the cadence unchanged. However, the impact of mechanical gear shifting is more obvious, and the riding experience is not good. In the case of stepless speed change, when the vehicle speed becomes faster and faster, the speed regulating planetary gear mechanism 32 is driven by the speed regulating motor 31 to change the transmission ratio of the system, so that the rider's cadence is more stable, and stepless speed change can be achieved, without gear shifting impact, and the riding experience is good.

[0080] The electric speed control device also includes a speed control transmission assembly 33, which includes a speed control driving wheel 331 and a speed control driven wheel 332. The speed control driving wheel 331 is connected to the speed control driven wheel 332 through transmission; the speed control driving wheel 331 is coaxially connected to the speed control planetary gear 322 through transmission, and the speed control driven wheel 332 is coaxially connected to the total output wheel 5 through transmission.

[0081] In this embodiment, the speed regulating driving wheel 331 is directly meshed with the speed regulating driven wheel 332 for transmission connection. In another embodiment, the speed regulating driving wheel 331 and the speed regulating driven wheel 332 can be connected via a chain, a synchronous belt, or an idler gear. For example, when both the speed regulating driving wheel 331 and the speed regulating driven wheel 332 are sprockets, the two are connected via a chain; when both the speed regulating driving wheel 331 and the speed regulating driven wheel 332 are pulleys, the two are connected via a synchronous belt; when both the speed regulating driving wheel 331 and the speed regulating driven wheel 332 are gears, the two are connected via an idler gear. Specific designs can be made as needed and are not further described here.

[0082] Continue as Figure 2 As shown, the electric power-assist device includes a power-assist motor 41, a power-assist first transmission wheel 42 and a power-assist second transmission wheel 43, wherein the power-assist second transmission wheel 43 is coaxially fixedly connected to the speed gear ring 323, the power-assist first transmission wheel 42 is transmission-connected to the output shaft of the power-assist motor 41, and the power-assist first transmission wheel 42 is simultaneously engaged with the power-assist second transmission wheel 43 and the human power transmission wheel 2, thereby achieving the goal that the rider's power and the power of the power-assist motor 41 share the power-assist second transmission wheel 43, and transmit the power to the speed gear ring 323, simplifying the gear transmission structure, improving the manufacturability of the product, and reducing processing costs.

[0083] It should be noted that Figure 2The power-assisting motor 41 and the power-assisting first transmission wheel 42 in the dotted line are only used to facilitate understanding that the power-assisting first transmission wheel 42 and the human power transmission wheel 2 are meshed in space, and the power-assisting first transmission wheel 42, the power-assisting second transmission wheel 43 and the human power transmission wheel 2 are similar in space. Figure 4 The triangular layout shown in the figure enables the rider's power and the power of the power-assisted motor 41 to share a power-assisted second transmission wheel 43, which transmits the power to the speed regulating ring gear 323. In addition, Figure 2 、 Figures 5 to 12 In the power system shown, the dotted line between the power-assisted second transmission wheel 43 and the human-powered transmission wheel 2 is used to indicate that there is no direct transmission relationship between the two.

[0084] In addition, it should be noted that Figure 4 The three circles shown in a triangular layout are only used to show a schematic diagram of one gear meshing with the other two gears at the same time in the spatial layout of three gears. The diameters of the three circles do not represent the diameters of the three gears: the first power-assisted transmission wheel 42, the second power-assisted transmission wheel 43 and the human-powered transmission wheel 2. The diameters and the number of teeth of the three gears: the first power-assisted transmission wheel 42, the second power-assisted transmission wheel 43 and the human-powered transmission wheel 2 are designed by those skilled in the art based on specific requirements and are not limited here.

[0085] This application provides four clutch matching schemes, which can be found in Figures 2 to 7 The clutch scheme shown, wherein Figure 2 The first clutch 61 and the second clutch 62 shown are scheme 1. Figure 5 The scheme of the first clutch 61 and the third clutch 63 shown is scheme 2. Figure 6 The scheme of the first clutch 61 and the fourth clutch 64 shown is scheme three. Figure 7 The illustrated scheme of the first clutch 61 and the fifth clutch 65 is scheme four.

[0086] Continue as Figure 2 As shown, the human-powered transmission wheel 2 is coaxially connected to the pedal shaft 1 via a first clutch 61, and the speed-adjusting driven wheel 332 is coaxially connected to the human-powered transmission wheel 2 via a second clutch 62. Based on this clutch solution, the power transmission paths of the power system in non-power-assisted mode, power-assisted mode, and fixed speed ratio mode are as follows.

[0087] In the unassisted mode, the first clutch 61 and the second clutch 62 are both wedged, and the rider's manpower is transmitted to the manpower transmission wheel 2 through the first clutch 61. Then the manpower transmission wheel 2 drives the speed-regulating driven wheel 332 to rotate synchronously, and finally the speed-regulating driven wheel 332 transmits power to the total output wheel 5, thereby realizing power output in the unassisted mode.

[0088] In power-assisted mode, the first clutch 61 is wedged, the second clutch 62 is disengaged, and both the power-assisted motor 41 and the speed-regulating motor 31 are in operation. Regarding the power input to the speed-regulating ring gear 323, on the one hand, the rider's power is transmitted to the human-powered transmission wheel 2 via the pedal shaft 1, then to the power-assisted second transmission wheel 43 via the power-assisted first transmission wheel 42, and finally to the speed-regulating ring gear 323. In other words, the rider's riding power is incorporated into riding in power-assisted mode, allowing the sensor to accurately obtain the rider's pedaling frequency and pedaling force, allowing the power-assisted motor 41 and the speed-regulating motor 31 to provide power that matches them. On the other hand, the power of the power-assisted motor 41 is transmitted to the power-assisted second transmission wheel 43 via the power-assisted first transmission wheel 42, and finally to the speed-regulating ring gear 323. The power-assisted motor 41 is used for electrically assisted riding. Furthermore, the power from the speed regulating motor 31 is transmitted to the speed regulating sun gear 321. The speed of the speed regulating sun gear 321 is determined by the speed of the speed regulating motor 31, while the speed of the speed regulating ring gear 323 is determined by the rider's cadence. Based on the operating principle of the planetary gear transmission mechanism, when the speeds of the speed regulating sun gear 321 and the speed regulating ring gear 323 are determined, the speed of the speed regulating planet gear 322 is also determined. The speed regulating planet gear 322 is then transmission-connected to the main output wheel 5, thereby transmitting power to the main output wheel 5. In this case, as the rider's cadence increases, the speed of the rear wheel 300 can be changed by changing the speed of the speed regulating motor 31, thereby achieving continuously variable speed change.

[0089] In fixed speed ratio mode, the first clutch 61 and the second clutch 62 are wedged, the speed regulating motor 31 is deactivated, and the power-assisting motor 41 is activated. Specifically, during normal riding, the rider's power is transmitted to the human-powered transmission wheel 2 via the pedal shaft 1, then to the speed-regulating driven wheel 332 via the second clutch 62, and finally to the rear wheel 300. Meanwhile, the power of the power-assisting motor 41 is directly transmitted to the human-powered transmission wheel 2 via the power-assisting first transmission wheel 42, then to the speed-regulating driven wheel 332 via the second clutch 62, and finally to the rear wheel 300, assisting human-powered riding. This mode is equivalent to riding an electric-assisted bicycle without a continuously variable transmission function.

[0090] The fixed speed ratio mode has the following advantages: due to the direct drive of the power-assisting motor 41, the power response speed is faster than the continuously variable speed mode. Ideally, the motor of this solution can adopt a fixed speed ratio + continuously variable speed combination mode. The fixed speed ratio mode is adopted in the starting stage, that is, the power-assisting motor 41 is directly driven. At this time, the motor's power response is faster and the rider's speed can be increased as soon as possible. After reaching a certain speed, the motor enters the continuously variable speed mode and is driven by the speed-regulating planetary gear mechanism 32, so that the cadence and speed change slowly.

[0091] like Figure 5As shown, the human-powered transmission wheel 2 is coaxially connected to the pedal shaft 1 via a first clutch 61, and the speed-adjusting driven wheel 332 is coaxially connected to the pedal shaft 1 via a third clutch 63. Based on this clutch scheme, the power transmission path of the power system in both unassisted and assisted modes is as follows.

[0092] When riding in the unassisted mode, the third clutch 63 is wedged. At this time, the rider's riding power can be transmitted to the speed-controlled driven wheel 332 through the pedal shaft 1, and then to the total output wheel 5, and finally to the rear wheel 300, realizing power transmission in the unassisted mode.

[0093] It should be noted that when the first clutch 61 is a friction clutch, in the unassisted mode, the first clutch 61 is wedged, causing the first and second power-assisted transmission wheels 42, 43, and the speed-regulating planetary gear mechanism 32 to idle under human power. When the first clutch 61 is an electromagnetic powder clutch, in this case, the first clutch 61 can be electromagnetically disengaged in the unassisted mode, preventing human power from driving the first and second power-assisted transmission wheels 42, 43, and the speed-regulating planetary gear mechanism 32.

[0094] When riding in the power-assisted mode, the first clutch 61 is wedged and the third clutch 63 is disengaged. At this time, the rider's riding power is transmitted to the human transmission wheel 2 through the pedal shaft 1, and then to the power-assisted first transmission wheel 42, and then to the speed regulating ring gear 323 through the power-assisted second transmission wheel 43. That is, the rider's riding power participates in riding in the power-assisted mode; the power of the power-assisted motor 41 is transmitted to the power-assisted second transmission wheel 43 through the power-assisted first transmission wheel 42, and finally to the speed regulating ring gear 323. The power-assisted motor 41 is used for electric power-assisted riding. In addition, the power of the speed regulating motor 31 is transmitted to the speed regulating sun gear 321. The speed of the speed regulating sun gear 321 is determined by the speed of the speed regulating motor 31, while the speed of the speed regulating ring gear 323 is determined by the rider's cadence. Based on the working principle of the planetary gear transmission mechanism, when the speed of the speed regulating ring gear 323 and the speed regulating sun gear 321 is determined, the speed of the speed regulating planetary gear 322 can also be determined. The power is then transmitted via the speed regulating planetary gear 322 to the speed regulating driving wheel 331, the speed regulating driven wheel 332, and finally to the total output wheel 5, thereby achieving power output in the power-assisted mode. In this case, as the rider's cadence increases, the speed of the rear wheel 300 can be changed by changing the speed of the speed regulating motor 31, thereby achieving stepless speed change. Compared with mechanical gear shifting, the gear shift shock generated during the speed change process can be avoided.

[0095] like Figure 6As shown, the human-powered transmission wheel 2 and the pedal shaft 1 are coaxially connected via a first clutch 61, the speed-regulating driven wheel 332 is rotationally coupled to the pedal shaft 1, and there is no clutch between the speed-regulating driven wheel 332 and the pedal shaft 1. The power system for the electric-assisted bicycle further includes a housing 600, the speed-regulating sun gear 321 is rotatably mounted on the housing 600, and a fourth clutch 64 is disposed between the speed-regulating sun gear 321 and the housing 600. Specifically, the housing 600 has mounting holes, the outer ring of the shaft sleeve is fixed to the housing 600, the inner ring of the shaft sleeve is fixed to the shaft of the speed-regulating sun gear 321, and the fourth clutch 64 is disposed between the inner ring of the shaft sleeve and the shaft of the speed-regulating sun gear 321. The fourth clutch 64 enables the speed-regulating sun gear 321 to be fixedly connected relative to the housing 600 or to rotate independently relative to the housing 600. When the fourth clutch 64 is wedged, the speed regulating sun gear 321 is fixed relative to the housing 600; when the fourth clutch 64 is disengaged, the speed regulating sun gear 321 can rotate relative to the housing 600. Based on this clutch solution, the power transmission path of the power system in the non-power-assisted mode and the power-assisted mode is as follows.

[0096] When riding in unassisted mode, the first clutch 61 and the fourth clutch 64 are wedged in. The rider's riding power is then transmitted via the pedal shaft 1 to the human-powered transmission wheel 2, which is then transferred to the speed regulating ring gear 323 via the first and second power-assisted transmission wheels 42 and 43. Since the speed regulating sun gear 321 is fixed relative to the housing 600 via the fourth clutch 64, the speed regulating planetary gear 322 can be determined. The power and speed of the speed regulating planetary gear 322 are then transmitted via the speed regulating driving wheel 331 and the speed regulating driven wheel 332 to the main output wheel 5, and finally to the rear wheel 300, achieving power transmission in unassisted mode. This solution effectively prevents the speed regulating motor 31 from reversing when riding in unassisted mode.

[0097] When riding in the power-assisted mode, the first clutch 61 is wedged and the fourth clutch 64 is disengaged. At this time, the rider's riding power is transmitted to the human-powered transmission wheel 2, the power-assisted first transmission wheel 42 and the power-assisted second transmission wheel 43 through the pedal shaft 1, and then to the speed regulating ring gear 323. That is, the rider's riding power participates in riding in the power-assisted mode; the power of the power-assisted motor 41 is transmitted to the power-assisted second transmission wheel 43 via the power-assisted first transmission wheel 42, and then to the speed regulating ring gear 323. The power-assisted motor 41 is used for electric power-assisted riding. In addition, the power of the speed regulating motor 31 is transmitted to the speed regulating sun gear 321. The speed of the speed regulating sun gear 321 is determined by the speed of the speed regulating motor 31, while the speed of the speed regulating ring gear 323 is determined by the rider's cadence. Based on the working principle of the planetary gear transmission mechanism, when the speed of the speed regulating ring gear 323 and the speed regulating sun gear 321 is determined, the speed of the speed regulating planetary gear 322 can also be determined. The power is then transmitted via the speed regulating planetary gear 322 to the speed regulating driving wheel 331, the speed regulating driven wheel 332, and finally to the total output wheel 5, thereby achieving power output in the power-assisted mode. In this case, as the rider's cadence increases, the speed of the rear wheel 300 can be changed by changing the speed of the speed regulating motor 31, thereby achieving stepless speed change. Compared with mechanical gear shifting, the gear shift shock generated during the speed change process can be avoided.

[0098] like Figure 7 As shown, the human-powered transmission wheel 2 and the pedal shaft 1 are coaxially connected via a first clutch 61, and the planetary wheel carrier 4421 of the speed-regulating planetary gear 322 is connected to the speed-regulating ring gear 323 via a fifth clutch 65. Based on this clutch solution, the power transmission paths of the power system in non-power-assisted mode, power-assisted mode, and fixed speed ratio are as follows.

[0099] In the unassisted mode, the first clutch 61 is wedged and the fifth clutch 65 is wedged. The rider's manpower is transmitted to the manpower transmission wheel 2 through the first clutch 61. The manpower transmission wheel 2 then transmits the power to the power-assisted first transmission wheel 42 and the power-assisted second transmission wheel 43. The power-assisted second transmission wheel 43 transmits the power to the speed regulating ring gear 323. The speed regulating ring gear 323 drives the speed regulating planetary gear 322 to rotate through the fifth clutch 65. The speed regulating planetary gear 322 then drives the speed regulating driving wheel 331 to rotate synchronously. The speed regulating driving wheel 331 drives the speed regulating driven wheel 332 to rotate synchronously. Finally, the speed regulating driven wheel 332 transmits the power to the total output wheel 5, thereby realizing power output in the unassisted mode.

[0100] In power-assisted mode, the first clutch 61 is engaged, the fifth clutch 65 is disengaged, and both the power-assisted motor 41 and the speed-regulating motor 31 are in operation. Regarding the power input to the speed-regulating ring gear 323, the rider's power is transmitted to the human-powered transmission wheel 2 via the pedal shaft 1, then to the power-assisted second transmission wheel 43 via the power-assisted first transmission wheel 42, and finally to the speed-regulating ring gear 323. Furthermore, the power of the power-assisted motor 41 is transmitted to the power-assisted second transmission wheel 43 via the power-assisted first transmission wheel 42, and finally to the speed-regulating ring gear 323. The power-assisted motor 41 is used for electrically assisted riding. Furthermore, the power from the speed regulating motor 31 is transmitted to the speed regulating sun gear 321. The speed of the speed regulating sun gear 321 is determined by the speed of the speed regulating motor 31, while the speed of the speed regulating ring gear 323 is determined by the rider's cadence. Based on the operating principle of the planetary gear transmission mechanism, when the speeds of the speed regulating sun gear 321 and the speed regulating ring gear 323 are determined, the speed of the speed regulating planet gear 322 is also determined. The speed regulating planet gear 322 is then transmission-connected to the main output wheel 5, thereby transmitting power to the main output wheel 5. In this case, as the rider's cadence increases, the speed of the rear wheel 300 can be changed by changing the speed of the speed regulating motor 31, thereby achieving continuously variable speed change.

[0101] In fixed speed ratio mode, the first clutch 61 is wedged in, the fifth clutch 65 is wedged in, the power-assisted motor 41 is operating, and the speed-regulating motor 31 is deactivated. The rider's manpower is transmitted through the first clutch 61 to the manpower transmission wheel 2, the first power-assisted transmission wheel 42, the second power-assisted transmission wheel 43, and the speed-regulating ring gear 323. Furthermore, the power of the power-assisted motor 41 is transmitted through the first power-assisted transmission wheel 42 and the second power-assisted transmission wheel 43 to the speed-regulating ring gear 323. Finally, the speed-regulating ring gear 323 drives the speed-regulating planetary gear 322 through the fifth clutch 65. The speed-regulating planetary gear 322 then drives the speed-regulating driving wheel 331 and the speed-regulating driven wheel 332 to rotate synchronously. Finally, the speed-regulating driven wheel 332 transmits power to the total output wheel 5, thus achieving power output in fixed speed ratio mode.

[0102] The fixed speed ratio mode also has the following advantages: due to the direct drive of the power-assisting motor 41, the power response speed is faster than that of the continuously variable speed mode. Ideally, the motor of this solution can adopt a fixed speed ratio + continuously variable speed combination mode. The fixed speed ratio mode is adopted in the starting stage, that is, the power-assisting motor 41 is directly driven. At this time, the motor's power response is faster and the rider's speed can be increased as soon as possible. After reaching a certain speed, the motor enters the continuously variable speed mode and is driven by the speed-regulating planetary gear mechanism 32, so that the cadence and speed change slowly.

[0103] like Figure 8 As shown, the number of the speed regulating planetary gear mechanism 32 provided in the present application is not limited to one, and may also be Figure 8 Two, three, or more as shown. Based on Figure 8 In the example shown, when the number of the speed regulating planetary gear mechanisms 32 is two, the two speed regulating planetary gear mechanisms 32 are arranged in sequence along the extension direction of the output shaft of the speed regulating motor 31, and the speed regulating sun gear 321 of the first speed regulating planetary gear mechanism 32 is transmission-connected to the output shaft of the speed regulating motor 31; in the two adjacent speed regulating planetary gear mechanisms 32, the speed regulating planet carrier of the speed regulating planetary gear mechanism 32 close to the speed regulating motor 31 is coaxially transmission-connected to the speed regulating sun gear 321 of the other speed regulating planetary gear mechanism 32; the speed regulating planet gear 322 of the second speed regulating planetary gear mechanism 32 is transmission-connected to the total output wheel 5 through the speed regulating transmission assembly 33, and the speed regulating ring gear 323 of the second speed regulating planetary gear mechanism 32 is transmission-connected to the output shaft of the power-assisting motor 41 through the power-assisting second transmission wheel 43 and the power-assisting first transmission wheel 42.

[0104] It is understood that when there are three or more speed-regulating planetary gear mechanisms 32, each speed-regulating planetary gear mechanism 32 is arranged sequentially along the extension direction of the output shaft of the speed-regulating motor 31, and the speed-regulating sun gear 321 of the first speed-regulating planetary gear mechanism 32 is in transmission connection with the output shaft of the speed-regulating motor 31. In two adjacent speed-regulating planetary gear mechanisms 32, the speed-regulating planet carrier of the speed-regulating planetary gear mechanism 32 closer to the speed-regulating motor 31 is coaxially transmission-connected with the speed-regulating sun gear 321 of the other speed-regulating planetary gear mechanism 32. The speed-regulating planet gear 322 of the last speed-regulating planetary gear mechanism 32 is transmission-connected to the main output gear 5 via the speed-regulating transmission assembly 33, and the speed-regulating ring gear 323 of the last speed-regulating planetary gear mechanism 32 is transmission-connected to the output shaft of the power-assisting motor 41. Furthermore, when two or more speed-regulating planetary gear mechanisms 32 are used, the maximum transmission ratio of the entire system can be further increased, thereby preventing slipping caused by excessive pedaling force.

[0105] It should be noted that in Figure 8 In the illustrated example, the speed regulating ring gears 323 of the two speed regulating planetary gear mechanisms 32 are coaxially fixedly connected, meaning that the power input to the speed regulating ring gears 323 of the two speed regulating planetary gear mechanisms 32 is the same. When there are three or more speed regulating planetary gear mechanisms 32, the speed regulating ring gears 323 of all speed regulating planetary gear mechanisms 32 can be coaxially fixedly connected. Of course, in other cases, when there are three or more speed regulating planetary gear mechanisms 32, the speed regulating ring gears 323 of each speed regulating planetary gear mechanism 32 can also be independently provided, with the speed regulating ring gear 323 of the last speed regulating planetary gear mechanism 32 being coaxially connected to the second power-assisted transmission wheel 43.

[0106] In addition, the Figure 8 The example shown is the same as Figure 2 The same parts of the examples shown can be found in the Figure 2 The description is not repeated here.

[0107] like Figures 8 to 12 As shown, the power-assisted first transmission wheel 42 provided in this application can be coaxially connected to the output shaft of the power-assisted motor 41 (as shown in FIG. Figures 8 to 10 ), or it may be coaxial with the output shaft of the power assist motor 41 (e.g. Figures 11 to 12 ), the specific plan is as follows.

[0108] like Figures 8 to 10 As shown, the power-assisted first transmission wheel 42 provided in this application is coaxially connected to the output shaft of the power-assisted motor 41, wherein: Figure 8 In the example shown, the power-assisted first transmission wheel 42 is coaxially and directly connected to the output shaft of the power-assisted motor 41; Figure 9 and Figure 10 In the example shown, the power-assisted first transmission wheel 42 is coaxially arranged with the output shaft of the power-assisted motor 41 , and the two are connected in transmission via a power-assisted planetary gear mechanism 44 . Figure 8 The exemplary solution has been described in detail above and will not be described again here.

[0109] like Figure 9 and Figure 10 As shown, the electric power-assist device also includes a power-assist planetary gear mechanism 44, which includes a power-assist sun gear 441, power-assist planetary gears 442, and a power-assist ring gear 443. The power system for the electric power-assist bicycle also includes a housing 600, to which the power-assist ring gear 443 is fixed. The power-assist motor 41 is coaxially connected to the power-assist sun gear 441, and the power-assist planetary gear 442 is coaxially connected to the power-assist first transmission wheel 42. This arrangement can reduce the speed of the power-assist motor 41 and increase the torque, improving the power-assist effect, making the electric power-assist bicycle suitable for use in complex road conditions such as mountainous terrain.

[0110] like Figure 9 As shown, the power-assisted planetary gear 442 includes a planetary gear carrier 4421 and a planetary gear set 4422. The planetary gear carrier 4421 is coaxially connected to the power-assisted first transmission wheel 42. The planetary gear set 4422 is in one group, and the planetary gear set 4422 is engaged with the power-assisted sun gear 441 and the power-assisted ring gear 443 at the same time.

[0111] In addition, the Figure 9 The example shown is the same as Figure 2 The same parts of the examples shown can be found in the Figure 2 The description is not repeated here.

[0112] like Figure 10As shown, the power-assisted planetary gear 442 includes a planetary gear carrier 4421, a planetary gear set 4422 and a connecting shaft 4423. The planetary gear carrier 4421 is coaxially connected to the power-assisted first transmission wheel 42. There are two planetary gear sets 4422, which are respectively recorded as the first planetary gear set 4422a and the second planetary gear set 4422b. Both planetary gear sets 4422 include planetary gears, and the number of planetary gears in each planetary gear set 4422 is the same as the number of the connecting shaft 4423. The corresponding planetary gears in the two planetary gear sets 4422 are respectively connected to the two ends of the connecting shaft 4423, wherein the first planetary gear set 4422a is meshed with the power-assisted sun gear 441, and the second planetary gear set 4422b is meshed with the power-assisted ring gear 443. Obviously, compared with Figure 9 The example shown, Figure 10 The example shown can further improve the speed reduction and torque increase effect, enhance the power assist effect, and make the electric power-assisted bicycle suitable for scenes with complex road conditions such as mountainous areas.

[0113] In addition, the Figure 10 The example shown is the same as Figure 2 The same parts of the examples shown can be found in the Figure 2 The description is not repeated here.

[0114] like Figures 11 to 12 As shown, the power-assisted first transmission wheel 42 provided in this application is not coaxial with the output shaft of the power-assisted motor 41. Figure 11 As shown, the power-assisted first transmission wheel 42 is not coaxial with the output shaft of the power-assisted motor 41, and the electric power-assisted device further includes a power-assisted third transmission wheel 451, which is coaxially connected to the output shaft of the power-assisted motor 41 and meshes with the power-assisted first transmission wheel 42. In this case, the power-assisted first transmission wheel 42 is similar to an idler wheel, which only plays a role in power transmission and does not change the transmission ratio. Figure 12 As shown, the first power-assistance transmission wheel 42 is not coaxial with the output shaft of the power-assistance motor 41, and the electric power-assistance device further includes a third power-assistance transmission wheel 451 and a fourth power-assistance transmission wheel 452. The third power-assistance transmission wheel 451 is coaxially connected to the output shaft of the power-assistance motor 41 and meshes with the fourth power-assistance transmission wheel 452. The fourth power-assistance transmission wheel 452 is coaxially fixedly connected to the first power-assistance transmission wheel 42. In this case, by changing the gear ratio between the third power-assistance transmission wheel 451 and the fourth power-assistance transmission wheel 452, and by changing the gear ratio between the fourth power-assistance transmission wheel 452 and the first power-assistance transmission wheel 42, the speed of the power-assistance motor 41 can be reduced and the torque increased, thereby achieving the effect of increasing the power assist.

[0115] In addition, the Figure 11 and Figure 12 The example shown is the same as Figure 2 The same parts of the examples shown can be found in the Figure 2 The description is not repeated here.

[0116] In summary, the present application provides two solutions for the speed regulating planetary gear mechanism 32. For example, for the solution of the speed regulating planetary gear mechanism 32, Figure 2 、 Figure 5 、 Figure 6 、 Figure 7 The schemes of the speed regulating planetary gear mechanism 32 in the examples shown are the same, which is scheme 1; Figure 8 The scheme of the speed regulating planetary gear 322 mechanism shown in the example is scheme 2.

[0117] This application provides five solutions for power-assisted transmission components. Figure 2 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 The scheme of the power-assisted transmission assembly of the example shown is the same, and is scheme one; Figure 9 The scheme of the power-assisted transmission assembly of the example shown is scheme 2; Figure 10 The scheme of the power-assisted transmission assembly of the example shown is scheme three; Figure 11 The scheme of the power-assisted transmission assembly of the example shown is scheme four; Figure 12 The scheme of the power-assisted transmission assembly of the example shown is scheme five.

[0118] This application provides four clutch solutions, such as Figure 2 The first clutch 61 and the second clutch 62 shown are scheme 1. Figure 5 The scheme of the first clutch 61 and the third clutch 63 shown is scheme 2. Figure 6 The scheme of the first clutch 61 and the fourth clutch 64 shown is scheme three. Figure 7 The scheme of the first clutch 61 and the fifth clutch 65 shown is scheme 4. The four clutch schemes are not only applicable to their corresponding illustrated examples, but can also be applied to other illustrated examples, such as Figures 8 to 12 The examples shown are not described one by one here. It is understood that those skilled in the art can, based on the solutions disclosed in this application, make any combination of different speed-regulating planetary gear mechanisms 32, different power transmission solutions, and four clutch solutions, all of which are within the scope of protection of this application, and are not described one by one here.

[0119] The present application also provides an electric power-assisted bicycle using the above power system, which can have an assisted riding mode, a non-assisted riding mode and a fixed speed ratio mode. Figure 5 、 Figure 6 When the clutch scheme is used, the electric power-assisted bicycle has an assisted riding mode and a non-assisted riding mode; when the electric power-assisted bicycle adopts Figure 2 、 Figure 7 When the clutch scheme is used, the electric bicycle has an assisted riding mode, a non-assisted riding mode, and a fixed speed ratio mode. The transmission paths of the different schemes are shown in the clutch scheme section and will not be repeated here.

[0120] The above shows and describes the basic principles, main features and advantages of this application. Those skilled in the art should understand that the above embodiments do not limit this application in any form, and any technical solutions obtained by equivalent replacement or equivalent transformation fall within the scope of protection of this application.

Claims

1. A power system for an electric power-assisted bicycle, characterized in that: include: Pedal shaft (1); A human-powered transmission wheel (2) is coaxially connected to the pedal shaft (1); An electric speed regulating device comprises a speed regulating motor (31) and a speed regulating planetary gear mechanism (32), wherein the speed regulating planetary gear mechanism (32) comprises a speed regulating sun gear (321), a speed regulating planetary gear (322) and a speed regulating ring gear (323), and the speed regulating motor (31) and the speed regulating sun gear (321) are coaxially connected in a transmission manner; An electric power assist device comprises a power assist motor (41), a power assist first transmission wheel (42) and a power assist second transmission wheel (43), wherein the power assist second transmission wheel (43) is coaxially fixedly connected to the speed regulating gear ring (323), the power assist motor (41) is in transmission connection with the power assist first transmission wheel (42), and the power assist first transmission wheel (42) is simultaneously engaged with the power assist second transmission wheel (43) and the human power transmission wheel (2); The total output wheel (5) is used for transmission connection with the rear wheel (300) of the bicycle, and the speed regulating planetary wheel (322) is transmission connected with the total output wheel (5).

2. The power system for an electric-assisted bicycle according to claim 1, characterized in that: The electric speed regulating device further comprises a speed regulating transmission assembly (33), wherein the speed regulating transmission assembly (33) comprises a speed regulating driving wheel (331) and a speed regulating driven wheel (332), wherein the speed regulating driving wheel (331) is transmission-connected to the speed regulating driven wheel (332); the speed regulating driving wheel (331) is coaxially transmission-connected to the speed regulating planetary wheel (322), and the speed regulating driven wheel (332) is coaxially transmission-connected to the total output wheel (5).

3. The power system for an electric-assisted bicycle according to claim 2, characterized in that: When the number of the speed regulating planetary gear mechanisms (32) is two or more, each of the speed regulating planetary gear mechanisms (32) is sequentially arranged along the extension direction of the output shaft of the speed regulating motor (31), and the speed regulating sun gear (321) of the first speed regulating planetary gear mechanism (32) is transmission-connected to the output shaft of the speed regulating motor (31); in two adjacent speed regulating planetary gear mechanisms (32), the speed regulating planet carrier of the speed regulating planetary gear mechanism (32) close to the speed regulating motor (31) is coaxially transmission-connected to the speed regulating sun gear (321) of the other speed regulating planetary gear mechanism (32); the speed regulating planet gear (322) of the last speed regulating planetary gear mechanism (32) is transmission-connected to the total output gear (5) through the speed regulating transmission assembly (33), and the speed regulating ring gear (323) of the last speed regulating planetary gear mechanism (32) is transmission-connected to the output shaft of the power assist motor (41).

4. The power system for an electric-assisted bicycle according to claim 2, characterized in that: The human-powered transmission wheel (2) and the pedal shaft (1) are coaxially connected via a first clutch (61), and the speed-adjusting driven wheel (332) and the human-powered transmission wheel (2) are coaxially connected via a second clutch (62); or The human-powered transmission wheel (2) and the pedal shaft (1) are coaxially connected via a first clutch (61), and the speed-adjusting driven wheel (332) and the pedal shaft (1) are coaxially connected via a third clutch (63); or The human-powered transmission wheel (2) and the pedal shaft (1) are coaxially connected via a first clutch (61), the speed-adjusting driven wheel (332) is rotationally coupled with the pedal shaft (1), the power system for the electric-assisted bicycle further comprises a housing (600), the speed-adjusting sun wheel (321) is rotatably mounted on the housing (600), and a fourth clutch (64) is provided between the speed-adjusting sun wheel (321) and the housing (600); or The human transmission wheel (2) and the pedal shaft (1) are coaxially connected via a first clutch (61), and the planetary wheel carrier (4421) of the speed regulating planetary wheel (322) and the speed regulating ring gear (323) are connected via a fifth clutch (65).

5. The power system for an electric-assisted bicycle according to claim 1, characterized in that: The total output wheel (5) is coaxially arranged with the pedal shaft (1).

6. The power system for an electric-assisted bicycle according to any one of claims 1 to 5, characterized in that: The power-assisted first transmission wheel (42) is coaxially and directly connected to the output shaft of the power-assisted motor (41).

7. The power system for an electric-assisted bicycle according to any one of claims 1 to 5, characterized in that: The electric power-assist device further comprises a power-assist planetary gear mechanism (44), the power-assist planetary gear mechanism (44) comprising a power-assist sun gear (441), a power-assist planetary gear (442) and a power-assist ring gear (443); the power system for the electric power-assist bicycle further comprises a housing (600), the power-assist ring gear (443) is fixed to the housing (600), the power-assist motor (41) is coaxially connected to the power-assist sun gear (441), and the power-assist planetary gear (442) is coaxially connected to the power-assist first transmission wheel (42).

8. The power system for an electric-assisted bicycle according to claim 7, characterized in that: The power-assisted planetary gear (442) comprises a planetary gear carrier (4421) and a planetary gear set (4422), wherein the planetary gear carrier (4421) is coaxially connected to the power-assisted first transmission wheel (42); the number of the planetary gear set (4422) is one set, and the planetary gear set (4422) is simultaneously engaged with the power-assisted sun gear (441) and the power-assisted ring gear (443); or The power-assisted planetary gear (442) comprises a planetary gear carrier (4421), a planetary gear set (4422) and a connecting shaft (4423); the planetary gear carrier (4421) is coaxially connected to the power-assisted first transmission wheel (42); there are two planetary gear sets (4422), both of which comprise planetary gears, and the number of planetary gears in each planetary gear set (4422) is the same as the number of the connecting shaft (4423); the corresponding planetary gears in the two planetary gear sets (4422) are respectively connected to the two ends of the connecting shaft (4423), wherein one planetary gear set (4422a) is meshed with the power-assisted sun gear (441), and the other planetary gear set (4422b) is meshed with the power-assisted ring gear (443).

9. The power system for an electric-assisted bicycle according to any one of claims 1 to 5, characterized in that: The first power-assisting transmission wheel (42) is not coaxial with the output shaft of the power-assisting motor (41), and the electric power-assisting device further includes a third power-assisting transmission wheel (451), the third power-assisting transmission wheel (451) is coaxially connected to the output shaft of the power-assisting motor (41) and meshes with the first power-assisting transmission wheel (42); or The power-assisting first transmission wheel (42) is not coaxial with the output shaft of the power-assisting motor (41), and the electric power-assisting device further comprises a power-assisting third transmission wheel (451) and a power-assisting fourth transmission wheel (452), wherein the power-assisting third transmission wheel (451) is coaxially connected to the output shaft of the power-assisting motor (41) and meshes with the power-assisting fourth transmission wheel (452), and the power-assisting fourth transmission wheel (452) is coaxially fixedly connected to the power-assisting first transmission wheel (42).

10. An electric power-assisted bicycle, characterized in that: The invention comprises a frame (100) and a power system for an electric-assisted bicycle according to any one of claims 1 to 9, wherein the power system for an electric-assisted bicycle is installed on the frame (100).

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