Power system for an electrically assisted bicycle and electrically assisted bicycle

Abstract

The application belongs to the technical field of bicycles and discloses a power system for an electrically assisted bicycle and the electrically assisted bicycle. The power system comprises a central shaft, a total output wheel, an electric speed regulating device and an electric assisting device. The electric speed regulating device comprises a speed regulating motor, a speed regulating planetary gear mechanism and a speed regulating transmission assembly. The central shaft is fixedly connected with a crank of the bicycle. The total output wheel is coaxially arranged with the central shaft and is in transmission connection with a rear wheel of the bicycle, that is, the central shaft is equivalent to a combination of an input shaft and an output shaft. The electric assisting device cooperates with the electric speed regulating device and transmits power to the total output wheel to realize stepless speed change function and assisting function. Meanwhile, the speed regulating motor and the speed regulating planetary gear mechanism are independently arranged outside the central shaft. The speed regulating transmission assembly is connected with the speed regulating planetary gear mechanism and the central shaft, the number of parts connected with the central shaft is reduced, the power system is applicable to external components such as a frame of a common bicycle, and a new external component does not need to be developed and designed, thereby reducing product cost.

Description

Technical Field

[0001] This application relates to the field of bicycle technology, specifically to a power system for an electric-assisted bicycle and an electric-assisted bicycle. Background Technology

[0002] Electric-assist bicycles not only offer the lightness and convenience of bicycles, but also effectively reduce the burden of riding a bicycle uphill, against the wind, or when carrying loads, thus significantly improving the rider's experience. The power system of an electric-assist bicycle typically includes sensors and an electric drive unit. Its working principle involves using sensors to detect the force applied by the rider's pedals, then determining the rider's riding intention based on the magnitude of that force, and finally controlling the electric drive unit to provide the corresponding driving force.

[0003] In related technologies, the power system of electric-assist bicycles uses a dual-motor drive to achieve power assistance and speed adjustment functions, improving the rider's riding experience. Regarding the dual-motor power system in this technology, there are two main situations: First, the power system has two output shafts (chainring connection shafts). One output shaft is coaxial with the power system's input shaft (pedal connection shaft), while the other output shaft is not coaxial with the input shaft. Alternatively, the power system has one output shaft, and the input shaft and output shaft are not coaxial. This makes it difficult for the power system to be compatible with existing bicycle frames and other external components, requiring the development of frames and other external components suitable for dual-motor power systems. This increases the overall cost of the product. Moreover, because the input and output shafts are not coaxial, the appearance of the electric-assist bicycle differs significantly from that of a regular bicycle, making it difficult for consumers to accept. Second, the power system has one output shaft, with the input and output shafts coaxial. However, the speed adjustment and shifting mechanism is also coaxial with the input shaft, resulting in a large number of components connected to the input shaft. Similarly, this makes it difficult for the input shaft and related components to be compatible with regular bicycle frames, again requiring the development of frames suitable for dual-motor power systems, thus increasing the overall cost of the product.

[0004] This section provides background information related to this application, which is not necessarily prior art. Utility Model Content

[0005] The purpose of this application is to solve or at least alleviate some or all of the aforementioned problems. Therefore, the purpose of this application is to provide a power system for an electric-assisted bicycle and an electric-assisted bicycle, wherein the input shaft and output shaft are coaxially arranged, making the appearance of the electric-assisted bicycle more similar to that of a traditional bicycle, which is more acceptable to consumers. Furthermore, the structure of the power system can be adapted to existing external components such as frames, eliminating the need to redevelop frames and related external components, thus reducing product costs.

[0006] To achieve the above objectives, this application adopts the following technical solution:

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

[0008] The bicycle includes a bottom bracket and a main output wheel. The bottom bracket is used for fixed connection with the crank of the bicycle, and the main output wheel is coaxially arranged with the bottom bracket and used for connection with the rear wheel drive of the bicycle.

[0009] An electric speed control device includes a speed-regulating motor, a speed-regulating planetary gear mechanism, and a speed-regulating transmission assembly. The speed-regulating motor and the speed-regulating planetary gear mechanism are independently external to the central shaft. The speed-regulating planetary gear mechanism includes a speed-regulating sun gear, speed-regulating planetary gears, and a speed-regulating ring gear. The speed-regulating motor and the speed-regulating sun gear are coaxially connected for transmission. The speed-regulating planetary gears are connected to the total output gear through the speed-regulating transmission assembly.

[0010] An electric power assist device includes a power assist motor, which is connected to the speed regulating gear ring drive.

[0011] As an optional solution for the power system of the electric-assist bicycle, a human-powered transmission component is also included. The human-powered transmission component includes a human-powered drive wheel and a human-powered driven wheel, which are connected in a driving connection. The human-powered drive wheel is coaxially connected to the bottom bracket via a first clutch, and the human-powered driven wheel is coaxially connected to the speed-regulating gear ring.

[0012] As an optional solution for the power system of the electric-assist bicycle, the speed-regulating transmission assembly includes a speed-regulating drive wheel and a speed-regulating driven wheel, wherein the speed-regulating drive wheel and the speed-regulating driven wheel are connected in a driving connection; the speed-regulating drive wheel is coaxially connected to the speed-regulating planetary gear, and the speed-regulating driven wheel is coaxially connected to the main output wheel.

[0013] The speed-regulating driven wheel is coaxially connected to the central shaft via a second clutch; or

[0014] The speed-regulating driven wheel is rotatably connected to the bottom bracket. The electric-assist bicycle power system also includes a housing. The speed-regulating sun gear is rotatably mounted on the housing, and a third clutch is provided between the speed-regulating sun gear and the housing. When the third clutch is engaged, the speed-regulating sun gear is relatively fixed to the housing. When the third clutch is disengaged, the speed-regulating sun gear can rotate relative to the housing.

[0015] The speed-regulating driven wheel and the manual drive wheel are coaxially connected via a fourth clutch; or

[0016] The planetary gear carrier of the speed-regulating planetary gear is connected to the speed-regulating ring gear via a fifth clutch.

[0017] As an optional embodiment of the power system for the electric-assisted bicycle, the power system for the electric-assisted bicycle further includes a housing, the speed-regulating sun gear is rotatably mounted on the housing, and a third clutch is provided between the speed-regulating sun gear and the housing; when the third clutch is engaged, the speed-regulating sun gear is relatively fixed to the housing; when the third clutch is disengaged, the speed-regulating sun gear can rotate relative to the housing.

[0018] As an optional solution for the power system of the electric-assisted bicycle, the electric assist device further includes an assist transmission assembly, which includes an assist drive wheel and an assist driven wheel. The assist drive wheel and the assist driven wheel are connected in a driving connection. The assist motor is coaxially connected to the assist drive wheel, and the assist driven wheel is connected in a driving connection to the speed-regulating gear ring.

[0019] As an optional solution for the power system of the electric-assist bicycle, the electric assist device further includes an assist planetary gear mechanism, which includes an assist sun gear, assist planetary gears, and an assist ring gear. The power system of the electric-assist bicycle also includes a housing, the assist ring gear being fixed to the housing, the assist motor being coaxially connected to the assist sun gear, and the assist planetary gears being coaxially connected to the assist drive wheel.

[0020] As an optional solution for the power system of the electric-assist bicycle, the electric-assist device further includes an assist transmission assembly, which includes an assist drive wheel, an assist first driven wheel, and an assist second driven wheel. The assist drive wheel is drivenly connected to the assist first driven wheel, the assist first driven wheel is drivenly connected to the assist second driven wheel, the assist first driven wheel is coaxially rotatably coupled with the bottom bracket, and the assist second driven wheel is coaxially drivenly connected with the speed regulating gear ring.

[0021] As an optional solution for the power system of the electric-assisted bicycle, the first driven wheel for power assistance includes a large wheel and a small wheel coaxially connected to the large wheel. The large wheel is drivenly connected to the driving wheel for power assistance, and the small wheel is drivenly connected to the second driven wheel for power assistance.

[0022] As an optional solution for the power system of the electric-assist bicycle, when there are two or more speed-regulating planetary gear mechanisms, each speed-regulating planetary gear mechanism is arranged sequentially along the extension direction of the output end of the speed-regulating motor, and the speed-regulating sun gear of the first speed-regulating planetary gear mechanism is driven to the output end 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 closer to the speed-regulating motor is coaxially driven 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 driven 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 driven to the output end of the power-assist motor through the power-assist transmission assembly.

[0023] As an optional power system for the electric-assisted bicycle, the speed regulating gear rings of all the speed regulating planetary gear mechanisms are coaxially and fixedly connected.

[0024] As an optional solution for the power system of the electric-assist bicycle, the speed-regulating planetary gear includes a planetary gear carrier and a planetary gear set. The planetary gear carrier is coaxially connected to the speed-regulating drive wheel. The number of planetary gear sets is one set, and the planetary gear set meshes with the speed-regulating sun gear and the speed-regulating ring gear simultaneously.

[0025] As an optional solution for the power system of the electric-assist bicycle, the speed-regulating planetary gear includes a planetary gear carrier, a planetary gear set, and a connecting shaft. The planetary gear carrier is coaxially connected to the speed-regulating drive wheel. There are two sets of planetary gear sets, each of which includes planetary gears. The number of planetary gears in each planetary gear set is the same as the number of connecting shafts. The corresponding planetary gears in the two sets of planetary gear sets are respectively connected to the two ends of the connecting shaft. One set of planetary gear sets meshes with the speed-regulating sun gear, and the other set of planetary gear sets meshes with the speed-regulating ring gear.

[0026] Secondly, this application provides an electric-assisted bicycle, including a frame and a power system for an electric-assisted bicycle as described in any of the preceding claims, wherein the power system for an electric-assisted bicycle is mounted on the frame.

[0027] The beneficial effects of this application are as follows:

[0028] The electric-assist bicycle power system provided in this application includes a bottom bracket, a main output wheel, an electric speed control device, and an electric assist device. The electric speed control device includes a speed-regulating motor, a speed-regulating planetary gear mechanism, and a speed-regulating transmission assembly. The bottom bracket is fixedly connected to the bicycle crank, and the main output wheel is coaxially connected to the bottom bracket for transmission. The main output wheel is also used for transmission connection to the bicycle's rear wheel, meaning the bottom bracket is equivalent to a combination of the input and output shafts. The electric assist device works with the electric speed control device to transmit power to the main output wheel, achieving continuously variable transmission and assist functions. Simultaneously, by independently and externally mounting the speed-regulating motor and the speed-regulating planetary gear mechanism relative to the bottom bracket, and connecting the speed-regulating planetary gear mechanism and the bottom bracket through the speed-regulating transmission assembly, the number of parts connected to the bottom bracket can be reduced. This allows the bottom bracket and its related components to be compatible with ordinary bicycle frames and other external components without the need for redesigning new frames or other external components, thus reducing product costs.

[0029] In addition, when the speed-regulating planetary gear mechanism adopts two or more sets of schemes in this power system, the overall maximum transmission ratio of the system can be further improved, avoiding slippage caused by excessive pedaling force from the rider.

[0030] In addition, in this power system, the first driven wheel of the power assist transmission component adopts a coaxial design with a large wheel and a small wheel. The large wheel meshes with the power assist drive wheel, and the small wheel meshes with the second driven wheel of the power assist. This can achieve the effect of reducing speed and increasing torque, providing greater assistance force, thereby improving the climbing power of the electric-assist bicycle, enabling the electric-assist bicycle to adapt to more complex road conditions, and improving the rider's riding experience.

[0031] Furthermore, in this power system, the speed-regulating driven wheel is connected to the bottom bracket via a second clutch, while the manual drive wheel is connected to the bottom bracket via a first clutch. In the absence of power assist, the second clutch engages, transmitting power via the bottom bracket to the speed-regulating driven wheel, then to the main output wheel, and finally to the rear wheel, achieving a riding experience comparable to a traditional bicycle. The first clutch allows the rider to easily reverse pedal the bottom bracket at the start of a ride to adjust the pedal position. Alternatively, the speed-regulating driven wheel and bottom bracket rotate in coordination, while the speed-regulating sun gear is connected to the housing via a third clutch. In the absence of power assist, the third clutch engages, the first clutch engages, and power is transmitted via the manual drive wheel and the manual driven wheel to the speed-regulating ring gear. Since the speed-regulating sun gear is fixed, the speed of the speed-regulating planetary gears is determined, and then the power is transmitted via the speed-regulating drive wheel to the speed-regulating driven wheel, then to the main output wheel, and finally to the rear wheel, preventing the speed-regulating motor from reversing in the absence of power assist mode. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this application and these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the structure of the electric-assisted bicycle provided in the embodiments of this application.

[0034] Figure 2 This is a schematic diagram of the power system of the first example provided in the embodiments of this application.

[0035] Figure 3 This is a schematic diagram showing the layout of the rotation axis of the central shaft, the rotation axis of the speed regulating motor, and the rotation axis of the assist motor provided in the embodiments of this application.

[0036] Figure 4 This is a schematic diagram illustrating the relationship between cadence and vehicle speed under different conditions, provided in an embodiment of this application.

[0037] Figure 5 This is a schematic diagram of the power system of the second example provided in the embodiments of this application.

[0038] Figure 6 This is a schematic diagram of the power system of the third example provided in the embodiments of this application.

[0039] Figure 7 This is a schematic diagram of the power system of the fourth example provided in the embodiments of this application.

[0040] Figure 8 This is a schematic diagram of the power system of the fifth example provided in the embodiments of this application.

[0041] Figure 9 This is a schematic diagram of the power system of the sixth example provided in the embodiments of this application.

[0042] Figure 10 yes Figure 9 A schematic diagram of the medium-speed planetary gear mechanism.

[0043] Figure 11 This is a schematic diagram of the power system of the seventh example provided in the embodiments of this application.

[0044] Figure 12 This is a schematic diagram of the power system of the eighth example provided in the embodiments of this application.

[0045] Figure label:

[0046] 100. Frame; 200. Front wheel; 300. Rear wheel; 400. Crank; 500. Pedals;

[0047] 1. Central axis;

[0048] 2. Main output wheel;

[0049] 31. Speed-regulating motor;

[0050] 32. Speed-regulating planetary gear mechanism; 321. Speed-regulating sun gear; 322. Speed-regulating planetary gears; 3221. Planetary gear carrier; 3222. Planetary gear set; 3222a. First planetary gear set; 3222b. Second planetary gear set; 3223. Connecting shaft; 323. Speed-regulating gear ring;

[0051] 33. Speed ​​regulating transmission assembly; 331. Speed ​​regulating drive wheel; 332. Speed ​​regulating driven wheel;

[0052] 41. Power assist motor;

[0053] 42. Power steering assembly; 421. Power steering drive wheel; 422. First power steering driven wheel; 4221. Large wheel; 4222. Small wheel; 423. Second power steering driven wheel; 424. Power steering driven wheel;

[0054] 43. Power-assisted planetary gear mechanism; 431. Power-assisted sun gear; 432. Power-assisted planetary gears; 433. Power-assisted ring gear;

[0055] 5. Manual transmission components; 51. Manual drive wheel; 52. Manual driven wheel;

[0056] 61. First clutch; 62. Second clutch;

[0057] 63. Third clutch;

[0058] 64. Fourth clutch; 65. Fifth clutch. Detailed Implementation

[0059] Before explaining any implementation of this application in detail, it should be understood that this application is not limited to its application to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0060] In this application, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0061] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this application generally indicates that the preceding and following related objects have an "and / or" relationship.

[0062] In this application, the terms "connection," "combination," "coupling," and "installation" can 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 the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary. Furthermore, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0063] In this application, those skilled in the art will understand that relative terms (e.g., “about,” “approximately,” “basically,” etc.) used in conjunction with quantities or conditions are to include the values ​​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 a particular value, tolerances associated with the particular value due to manufacturing, assembly, use, etc. Such terms should also be considered as disclosing a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​not using relative terms should also be disclosed as specific values ​​with tolerances. Furthermore, “basically” when expressing relative angular relationships (e.g., substantially parallel, substantially perpendicular) may refer to a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) added to or subtracted from the indicated angle.

[0064] In this application, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0065] In this application, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when an element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent positive orientation but can also be understood as lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.

[0066] like Figure 1 As shown, this application provides an electric-assisted bicycle, including a frame 100, a front wheel 200, a rear wheel 300, a crank 400, pedals 500, and a power system. The front wheel 200 and rear wheel 300 are rotatably mounted on the frame 100, and the power system is mounted on the frame 100. One end of the crank 400 is connected to the power system, and the other end of the crank 400 is connected to the pedals 500. When the rider pedals 500, the power system provides corresponding auxiliary power in accordance with the rider's pedaling force, so as to work together with human power to drive the rear wheel 300 to rotate, thereby propelling the electric-assisted bicycle forward.

[0067] In related technologies, the power system of electric-assist bicycles uses dual-motor drive to achieve power assistance and speed adjustment functions, improving the rider's riding experience. Regarding the dual-motor power system in these technologies, there are two main situations: First, the power system has two output shafts (chainring connection shafts), one of which is coaxial with the input shaft (pedal connection shaft), and the other is not coaxial with the input shaft; or the power system has one output shaft, and the input shaft and this output shaft are not coaxial. This makes it difficult for the power system to be compatible with existing bicycle frames and other external components, requiring the development of new frames and other external components suitable for dual-motor power systems. This results in higher overall product costs. Moreover, because the input and output shafts are not coaxial, the appearance of the electric-assist bicycle differs significantly from that of a regular bicycle, making it difficult for consumers to accept. Secondly, the power system has an output shaft, and the input shaft of the power system is coaxially set with the output shaft. However, the speed regulation and transmission mechanism of the power system is arranged coaxially with the input shaft, which results in a large number of parts connected to the input shaft. Similarly, it is difficult for the input shaft and related parts to be compatible with the frame 100 of a regular bicycle. It is also necessary to redevelop the frame 100 suitable for the dual-motor power system, which makes the overall cost of the product higher.

[0068] To solve or mitigate the above problems, this application provides a power system for electric-assisted bicycles, such as... Figures 2 to 11As shown, the input shaft (pedal connection shaft) and output shaft (chainring connection shaft) are coaxially arranged, making the appearance of the electric-assist bicycle more similar to that of a traditional bicycle, which is more acceptable to consumers. Moreover, the structure of the power system can be used with existing external components such as the frame 100, without the need to redevelop the frame 100 and related external components, thus reducing product costs.

[0069] like Figure 2 As shown, the power system includes a bottom bracket 1, a main output wheel 2, an electric speed control device, and an electric assist device. The electric speed control device includes a speed control motor 31, a speed control planetary gear mechanism 32, and a speed control transmission assembly 33. The bottom bracket 1 is fixedly connected to the bicycle crank 400. The main output wheel 2 is coaxially connected to the bottom bracket 1 and is also connected to the bicycle rear wheel 300. In other words, the bottom bracket 1 is equivalent to a combination of the input shaft and the output shaft. The electric assist device works with the electric speed control device to transmit power to the main output wheel 2 to achieve continuously variable transmission and power assist functions. At the same time, the speed control motor 31 and the speed control planetary gear mechanism 32 are independently external to the bottom bracket 1. The speed control planetary gear mechanism 32 and the bottom bracket 1 are connected by the speed control transmission assembly 33, which reduces the number of parts connected to the bottom bracket 1. This allows the bottom bracket 1 and its related parts to be compatible with external components such as the frame 100 of a common bicycle, without the need to redesign and develop new external components such as the frame 100, thus reducing product costs.

[0070] In one embodiment, the power system further includes sensors, including a torque sensor and a cadence magnetic ring, wherein 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.

[0071] It should be noted that the main output wheel 2 and the rear wheel 300 are connected by a chain or synchronous belt drive. For example, the main output wheel 2 can be a sprocket, such as a chainring, in which case the main output wheel 2 and the rear wheel 300 are connected by a chain drive; or, for another example, the main output wheel 2 can be a pulley, in which case the main output wheel 2 and the rear wheel 300 are connected by a synchronous belt drive.

[0072] Figure 3 The view shown is a side view of an electric-assist bicycle placed on the ground. Figure 3 A schematic diagram showing the layout of the rotation axis of the central shaft 1, the rotation axis of the speed regulating motor 31, and the rotation axis of the assist motor 41 is shown, as follows. Figure 3As shown, the rotation axis of the output end of the speed-regulating motor 31 is parallel and spaced apart from the rotation axis of the central shaft 1, and the rotation axis of the output end of the power assist motor 41 is parallel and spaced apart from the rotation axis of the central shaft 1. The rotation axes of the central shaft 1, the speed-regulating motor 31, and the power assist motor 41 form a spatial triangle, and the power assist motor 41 and the speed-regulating motor 31 are located on both sides of the central shaft 1. On the one hand, this allows for a balanced arrangement of components on both sides of the central shaft 1; on the other hand, it reduces the size of the power system in the horizontal length direction compared to the three-axis flat layout, making the power system structure more compact and more suitable for the frame structure of ordinary electric-assist bicycles.

[0073] In one embodiment, such as Figure 2 As shown, there is one speed-regulating planetary gear mechanism 32, which includes a speed-regulating sun gear 321, speed-regulating planetary gears 322, and a speed-regulating ring gear 323. The speed-regulating motor 31 is coaxially connected to the speed-regulating sun gear 321, and the power assist motor 41 is connected to the speed-regulating ring gear 323. The speed-regulating planetary gear 322 is connected to the main output wheel 2 via the speed-regulating transmission assembly 33. When the output speed of the speed-regulating motor 31 is determined, the speed of the speed-regulating sun gear 321 can be determined. When the rider's cadence is determined, the speed of the speed-regulating ring gear 323 can be determined. When the speeds of the speed-regulating sun gear 321 and the speed-regulating ring gear 323 are determined, the output speed of the speed-regulating planetary gear 322 can be determined, and thus the speed transmitted to the main output wheel 2 via the speed-regulating transmission assembly 33 can also be determined, ultimately determining the speed output to the rear wheel 300. Therefore, it can be seen that during the rider's riding process, the assist motor 41 will provide a certain assistance based on the pedaling torque collected by the torque sensor and the cadence data read by the cadence magnetic ring. At this time, as the rider's cadence continues to increase, the speed output of the speed regulating motor 31 can be changed to change the speed of the rear wheel 300, thus achieving stepless speed change. Compared with mechanical gear shifting, it can avoid the shifting shock generated during the shifting process.

[0074] To better understand the differences between continuously variable transmissions (CVTs), mechanical shift transmissions, and transmissions without a gear shift function, see [link to relevant documentation]. Figure 4The diagram illustrates the relationship between cadence and speed under different conditions. For the no-gear configuration, to continuously increase speed, the rider needs to continuously increase cadence; that is, cadence and speed have a linear relationship without gears. However, the rider's cadence is limited, thus preventing the bicycle's speed from increasing indefinitely. For mechanical gear shifting, the rider can change the relationship between cadence and speed by shifting gears, achieving increased speed while decreasing or maintaining the same cadence. However, mechanical gear shifting has a noticeable jolt, resulting in a poor riding experience. For continuously variable transmission (CVT), as the speed increases, the speed-regulating motor 31 drives the speed-regulating planetary gear mechanism 32 to change the system's transmission ratio, making the rider's cadence more stable and achieving stepless shifting without shift shock, resulting in a superior riding experience.

[0075] It is understandable that the number of speed-regulating planetary gear mechanisms 32 can be one, two, three, four, or more. The more speed-regulating planetary gear mechanisms 32 there are, the higher the speed regulation capability of the power system.

[0076] In another embodiment, such as Figure 5 As shown, when there are two speed-regulating planetary gear mechanisms 32, the two speed-regulating planetary gear mechanisms 32 are arranged sequentially along the extension direction of the output end of the speed-regulating motor 31, and the speed-regulating sun gear 321 of the first speed-regulating planetary gear mechanism 32 is driven to the output end of the speed-regulating motor 31; among the 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 driven 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 driven to the total output gear 2 through the speed-regulating transmission assembly 33, and the speed-regulating ring gear 323 of the second speed-regulating planetary gear mechanism 32 is driven to the output end of the power-assisting motor 41 through the power-assisting transmission assembly 42.

[0077] It is understandable 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 end of the speed-regulating motor 31, and the speed-regulating sun gear 321 of the first speed-regulating planetary gear mechanism 32 is driven to the output end 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 driven 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 driven to the total output gear 2 through the speed-regulating transmission assembly 33, and the speed-regulating ring gear 323 of the last speed-regulating planetary gear mechanism 32 is driven to the output end of the power-assisting motor 41 through the power-assisting transmission assembly 42.

[0078] It should be noted that, in Figure 5In the example shown, the speed regulating ring gears 323 of the two speed regulating planetary gear mechanisms 32 are coaxially and fixedly connected, meaning that the power input of the speed regulating ring gears 323 of the two speed regulating planetary gear mechanisms 32 is the same, both coming from the power input from the power-assisted driven wheel 424 and the power input from the manual driven wheel 52. 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 and 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 set independently. In this case, the speed regulating ring gear 323 of the last speed regulating planetary gear mechanism 32 is connected to the power-assisted driven wheel 424 and the manual driven wheel 52, receiving power from the power-assisted driving wheel 421 and the manual driving wheel 51, respectively.

[0079] The speed regulating transmission assembly 33 includes a speed regulating drive wheel 331 and a speed regulating driven wheel 332. The speed regulating drive wheel 331 and the speed regulating driven wheel 332 are connected in a driving connection. The speed regulating drive wheel 331 is coaxially connected in a driving connection with the speed regulating planetary gear 322. The speed regulating driven wheel 332 is coaxially connected in a driving connection with the main output wheel 2. The speed regulating driven wheel 332 is coaxially connected in a driving connection with the central shaft 1 through the second clutch 62. With the second clutch 62 engaged, when riding in assist mode, the second clutch 62 is disengaged. At this time, the rider's riding power is not transmitted to the speed-adjusting driven wheel 332 through the central shaft 1. Instead, the speed of the speed-adjusting planetary gear 322 is transmitted to the speed-adjusting driven wheel 332 through the speed-adjusting driving wheel 331, then to the main output wheel 2, and finally to the rear wheel 300, thus achieving power transmission in assist mode. When riding in non-assist mode, the second clutch 62 is engaged. At this time, the rider's riding power can be transmitted to the speed-adjusting driven wheel 332 through the central shaft 1, then to the main output wheel 2, and finally to the rear wheel 300, thus achieving power transmission in non-assist mode.

[0080] In this embodiment, the speed-regulating drive wheel 331 and the speed-regulating driven wheel 332 are directly meshed and connected for transmission. In another embodiment, the speed-regulating drive wheel 331 and the speed-regulating driven wheel 332 can be connected by a chain, a synchronous belt, or an idler pulley. For example, when both the speed-regulating drive wheel 331 and the speed-regulating driven wheel 332 are sprockets, they are connected by a chain; when both the speed-regulating drive wheel 331 and the speed-regulating driven wheel 332 are pulleys, they are connected by a synchronous belt; when both the speed-regulating drive wheel 331 and the speed-regulating driven wheel 332 are gears, they are connected by an idler pulley. Specific designs can be implemented as needed, and will not be elaborated further here.

[0081] The power system also includes a manual transmission component 5, which comprises a manual drive wheel 51 and a manual driven wheel 52, with the drive wheel 51 and driven wheel 52 being connected in a transmission manner. A sensor is installed on the drive wheel 51, which is coaxially connected to the central shaft 1 via a first clutch 61. The driven wheel 52 is coaxially connected to the speed-regulating ring gear 323. With the first clutch 61 engaged, in assisted riding mode, the first clutch 61 is engaged, and the second clutch 62 is disengaged. At this time, the rider's riding power is transmitted through the central shaft 1 to the drive wheel 51, then to the driven wheel 52, and finally to the speed-regulating ring gear 323. This means the rider's riding power participates in assisted riding mode, allowing the sensor to accurately obtain the rider's cadence and pedaling force, thus obtaining cadence and pedaling force that better match the rider's actual riding state. This facilitates the electric assist device providing electric assist that better matches the pedaling force, and also allows the electric speed regulator to provide a gear ratio that better matches the cadence, improving the rider's riding experience. When riding in unassisted mode, the second clutch 62 is engaged. At this time, the rider's riding power can be transmitted through the bottom shaft 1 to the speed-adjusting driven wheel 332, then to the main output wheel 2, and finally to the rear wheel 300, thus realizing power transmission in unassisted mode.

[0082] In one embodiment, the first clutch 61 is a friction clutch. When the electric-assist bicycle is in unassisted mode, the first clutch 61 is in a wedged state, and the speed-regulating planetary gear mechanism 32 and the power assist transmission component 42 idle under manual operation. In another embodiment, the first clutch 61 may be an electromagnetic powder clutch. In this case, when the electric-assist bicycle is in unassisted mode, the first clutch 61 can be disengaged by electromagnetic control. At this time, manual operation will not drive the speed-regulating planetary gear mechanism 32 and the power assist transmission component 42.

[0083] In this embodiment, the manual drive wheel 51 and the manual driven wheel 52 are directly meshed and connected for transmission. In another embodiment, the manual drive wheel 51 and the manual driven wheel 52 can be connected by a chain, a timing belt, or an idler pulley. For example, when both the manual drive wheel 51 and the manual driven wheel 52 are sprockets, they are connected by a chain; when both the manual drive wheel 51 and the manual driven wheel 52 are pulleys, they are connected by a timing belt; when both the manual drive wheel 51 and the manual driven wheel 52 are gears, they are connected by an idler pulley. Specific designs can be implemented as needed, and will not be elaborated further here.

[0084] In other embodiments, such as Figure 6 As shown, the Figure 6 The example shown is the same as Figure 2The difference in the examples shown lies in the connection method between the speed-regulating driven wheel 332 and the central shaft 1, and the connection method between the speed-regulating sun gear 331 and the housing. The specific solution is as follows: the speed-regulating driven wheel 332 is rotatably mounted on the central shaft 1, and there is no clutch between the speed-regulating driven wheel 332 and the central shaft 1. In this case, the power system also includes a housing, and the speed-regulating sun gear 321 is rotatably mounted on the housing. The speed-regulating sun gear 321 is connected to the housing via a third clutch 63. Specifically, the housing has mounting holes to fix the outer ring of the bushing to the housing, and the inner ring of the bushing is fixed to the shaft portion of the speed-regulating sun gear 321. A third clutch 63 is provided between the inner ring of the bushing and the shaft portion of the speed-regulating sun gear 321. The third clutch 63 enables the speed-regulating sun gear 321 to be fixedly connected to the housing or to rotate independently relative to the housing. When the third clutch 63 is engaged, the speed-regulating sun gear 321 is relatively fixed to the housing; when the third clutch 63 is disengaged, the speed-regulating sun gear 321 can rotate relative to the housing.

[0085] In this situation, when riding in assist mode, the first clutch 61 is engaged and the third clutch 63 is disengaged. At this time, the rider's riding power is transmitted through the bottom shaft 1 to the human-driven wheel 51 and the human-driven wheel 52, and then to the speed-regulating ring gear 323. That is, the rider's riding power participates in riding in assist mode, so that the sensor can accurately obtain the rider's cadence and pedaling force, and obtain a cadence and pedaling force that are more in line with the rider's actual riding state. This makes it easier for the electric assist device to provide electric assistance that is more matched with the pedaling force, and at the same time, it makes it easier for the electric speed regulating device to provide a gear ratio that is more matched with the cadence, thus improving the rider's riding experience.

[0086] When riding in power-free mode, the first clutch 61 and the third clutch 63 are engaged. At this time, the rider's power is transmitted through the central shaft 1 to the manual drive wheel 51, and then through the manual driven wheel 52 to the speed-regulating ring gear 323. Since the speed-regulating sun gear 321 is fixed to the housing via the third clutch 63, the rotational speed of the speed-regulating planetary gear 322 is determined. The speed-regulating planetary gear 322 then transmits power to the main output wheel 2 via the speed-regulating drive wheel 331 and the speed-regulating driven wheel 332, and finally to the rear wheel 300, thus achieving power transmission in power-free mode. This design effectively prevents the speed-regulating motor 31 from reversing during power-free riding.

[0087] In another embodiment, such as Figure 7 As shown, the Figure 7 The example shown is the same as Figure 2 The difference in the examples shown lies in the connection method between the human-powered drive wheel 51 and the speed-regulating driven wheel 332. Specifically, as follows: Figure 7In the example shown, the manual drive wheel 51 is connected to the central shaft 1 via the first clutch 61, and the speed-regulating driven wheel 332 is coaxially and fixedly connected to the manual drive wheel 51 via the fourth clutch 64.

[0088] In the no-assist mode, both the first clutch 61 and the fourth clutch 64 are engaged. The rider's power is transmitted to the human drive wheel 51 through the first clutch 61. The human drive wheel 51 then drives the speed-adjusting driven wheel 332 to rotate synchronously. Finally, the speed-adjusting driven wheel 332 transmits the power to the main output wheel 2, thereby achieving power output in the no-assist mode.

[0089] In power-assisted mode, the first clutch 61 is engaged, the fourth clutch 64 is disengaged, and both the power-assisted motor 41 and the speed-regulating motor 31 are working. Power is transmitted to the speed-regulating driving wheel 331 and the speed-regulating driven wheel 332 via the speed-regulating planetary gear 322, and finally to the total output wheel 2, thereby realizing power output in power-assisted mode.

[0090] In addition, Figure 7 In the example shown, when the power system adopts Figure 7 In the illustrated scheme, the power system also has a fixed speed ratio mode. In this mode, the first clutch 61 and the fourth clutch 64 are engaged, the speed-regulating motor 31 is not activated, and the assist motor 41 is activated. Specifically, during normal riding, the rider's power is transmitted to the human-driven wheel 51 via the central shaft 1, then to the speed-regulating driven wheel 332 via the fourth clutch 64, and finally to the rear wheel 300. On the other hand, the power of the assist motor 41 is transmitted to the second assist driven wheel 423 via the assist drive wheel 421, the large wheel 4221, and the small wheel 4222, then to the human-driven driven wheel 52 via the speed-regulating gear ring 323, and finally to the human-driven drive wheel 51 via the human-driven driven wheel 52 to assist human riding. This mode is equivalent to the riding method of an electric-assist bicycle without continuously variable transmission (CVT). The fixed speed ratio mode has the following advantages: due to the direct drive of the assist motor 41, the power response is faster than that of the continuously variable transmission (CVT) mode. Ideally, the motor in this scheme can adopt a combination of fixed speed ratio and CVT. In the starting phase, the fixed speed ratio mode is used, that is, the assist motor 41 is directly driven. At this time, the motor's assist response is faster, which can quickly increase the rider's speed. After a certain speed is achieved, the motor enters the CVT mode, driven by the speed-regulating planetary gear mechanism 32, so that the cadence and speed change slowly.

[0091] It should be noted that, Figure 7 In the fixed speed ratio mode of the example shown, for the power transmission at the manual drive wheel 51 and the manual driven wheel 52, the power is transmitted from the manual driven wheel 52 to the drive wheel 51, and then through the fourth clutch 64 to the main output wheel 2. This transmission path is similar to... Figure 7The example shown differs from other patterns and also from other examples in its transmission path. Furthermore, this... Figure 7 The example shown is the same as Figure 2 The same part of the example shown can be found in the section on Figure 2 The description will not be repeated here.

[0092] In another embodiment, such as Figure 8 As shown, the Figure 8 The example shown is the same as Figure 2 The differences in the examples shown are: the connection method between the speed-regulating driven gear 332 and the central shaft 1 is different, and the engagement method between the speed-regulating planetary gear 322 and the speed-regulating ring gear 323 is different. Specifically, as follows: Figure 8 As shown, in Figure 8 In the example shown, the speed-regulating driven wheel 332 is rotatably connected to the central shaft 1, the manual drive wheel 51 is connected to the central shaft 1 via the first clutch 61, and the planetary gear carrier 3221 of the speed-regulating planetary gear 322 is connected to the speed-regulating ring gear 323 via the fifth clutch 65.

[0093] In the no-assist mode, the first clutch 61 and the fifth clutch 65 are engaged. The rider's power is transmitted to the drive wheel 51 through the first clutch 61. The drive wheel 51 then transmits power to the driven wheel 52. The driven wheel 52 transmits 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 drive wheel 331 and the speed-regulating driven wheel 332 to rotate synchronously. Finally, the speed-regulating driven wheel 332 transmits power to the main output wheel 2, thus achieving power output in the no-assist mode.

[0094] 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 working. Power is transmitted to the speed-regulating driving wheel 331 and the speed-regulating driven wheel 332 via the speed-regulating planetary gear 322, and finally to the total output wheel 2, thereby realizing the power output in power-assisted mode.

[0095] In addition, Figure 8 The example shown is the same as Figure 7The example shown also has a fixed speed ratio mode. In the fixed speed ratio mode, the first clutch 61 is engaged, the fifth clutch 65 is engaged, the power assist motor 41 is working, and the speed regulating motor 31 is not working. On the one hand, the rider's power is transmitted to the power drive wheel 51, the power driven wheel 52, and the speed regulating gear ring 323 through the first clutch 61; on the other hand, the power of the power assist motor 41 is transmitted to the speed regulating gear ring 323 through the power assist transmission assembly 42. Finally, the speed regulating gear ring 323 drives the speed regulating planetary gear 322 to rotate through the fifth clutch 65, which in turn drives the speed regulating driven wheel 332 to rotate synchronously. Finally, the speed regulating driven wheel 332 transmits the power to the main output wheel 2, thereby realizing the power output in the fixed speed ratio mode. The fixed speed ratio mode also has the following advantages: due to the direct drive of the assist motor 41, the power response is faster than that of the continuously variable transmission mode. Ideally, the motor in this scheme can adopt a combination of fixed speed ratio and continuously variable transmission. In the starting stage, the fixed speed ratio mode is used, that is, the assist motor 41 is directly driven. At this time, the motor's assist response is faster, which can quickly increase the rider's speed. After a certain speed is achieved, the motor enters the continuously variable transmission mode, driven by the speed-adjusting planetary gear mechanism 32, so that the cadence and speed change slowly.

[0096] It should be noted that... Figure 8 The example shown is the same as Figure 2 The same part of the example shown can be found in the section on Figure 2 The description will not be repeated here.

[0097] In another embodiment, such as Figure 9 As shown, the Figure 9 The example shown is the same as Figure 2 The main difference in the examples shown lies in the structure of the speed-regulating planetary gear mechanism 32. Specifically, as follows: Figure 9 Combination Figure 10 As shown, there is one 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 power assist motor 41 is connected to the speed-regulating ring gear 323, and the speed-regulating planetary gear 322 is connected to the main output gear 2 through the speed-regulating transmission assembly 33.

[0098] Furthermore, the speed-regulating planetary gear 322 includes a planetary gear carrier 3221, planetary gear sets 3222, and connecting shafts 3223. There are two sets of planetary gear sets 3222, designated as the first planetary gear set 3222a and the second planetary gear set 3222b. The planetary gear carrier 3221 is coaxially connected to the speed-regulating drive gear 331, for example, by a fixed coaxial connection or a coaxial keyway connection. Both the first planetary gear set 3222a and the second planetary gear set 3222b include at least three planetary gears, evenly spaced around the rotation center of the speed-regulating sun gear 321 along the same circumference. The number of connecting shafts 3223 is the same as the number of planetary gears in each set of planetary gear sets 3222. Furthermore, corresponding planetary gears in the first planetary gear set 3222a and the second planetary gear set 3222b are connected to their respective connecting shafts.

[0099] At both ends of 3223, the first planetary gear set 3222a meshes with the speed-regulating sun gear 321, and the second planetary gear set 3222b meshes with the speed-regulating ring gear 323. With this configuration, the speed regulation capability of the speed-regulating planetary gear mechanism 32 can be further improved by rationally designing the size and number of teeth of the planetary gears in the two planetary gear sets 3222.

[0100] It should be noted that... Figure 9 The example shown is the same as Figure 2 The same part of the example shown can be found in the section on Figure 2 The description will not be repeated here.

[0101] To facilitate the transmission of power from the power-assist motor 41 to the speed-regulating gear ring 323, the electric power-assist device also includes a power-assist transmission assembly 42. The power-assist transmission assembly 42 includes a power-assist drive wheel 421 and a power-assist driven wheel 424. The power-assist drive wheel 421 and the power-assist driven wheel 424 are connected in a transmission connection. The power-assist motor 41 is coaxially connected to the power-assist drive wheel 421, and the power-assist driven wheel 424 is connected in a transmission connection to the speed-regulating gear ring 323.

[0102] exist Figure 2 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 In the example shown, the power-assisted driven wheel 424 also includes a power-assisted first driven wheel 422 and a power-assisted second driven wheel 423. The power-assisted first driven wheel 422 and the power-assisted second driven wheel 423 are connected in a transmission manner. The power-assisted first driven wheel 422 is coaxially rotated with the central shaft 1, and the power-assisted second driven wheel 423 is coaxially connected in a transmission manner with the speed-regulating gear ring 323. By setting the power-assisted first driven wheel 422 and the power-assisted second driven wheel 423, the speed reduction and torque increase effect of the power-assisted motor 41 can be achieved.

[0103] Furthermore, the first driven wheel 422 includes a large wheel 4221 and a small wheel 4222 coaxially connected to the large wheel 4221. The large wheel 4221 is driven by the driving wheel 421, and the small wheel 4222 is driven by the second driven wheel 423. This configuration can further enhance the speed reduction and torque increase effect of the driven wheel 424, improve the overall assist effect of the electric power assist device, reduce the riding difficulty for the rider, and alleviate the rider's riding fatigue.

[0104] In this embodiment, the drive wheel 421 and the large wheel 4221 are directly meshed and connected for transmission. In another embodiment, the drive wheel 421 and the large wheel 4221 are connected for transmission via a chain, synchronous belt, or idler pulley. For example, when both the drive wheel 421 and the large wheel 4221 are sprockets, they are connected for transmission via a chain; when both the drive wheel 421 and the large wheel 4221 are pulleys, they are connected for transmission via a synchronous belt; when both the drive wheel 421 and the large wheel 4221 are gears, they are connected for transmission via an idler pulley. Specific designs can be implemented as needed, and will not be elaborated further here.

[0105] In another embodiment, such as Figure 11 As shown, the Figure 11 The example shown is the same as Figure 2 The difference between the examples shown lies in the structure and layout of the electric assist device. Specifically, as follows: Figure 11 As shown, the electric power assist device also includes a power assist planetary gear mechanism 43, which includes a power assist sun gear 431, power assist planetary gears 432, and a power assist ring gear 433. The power assist ring gear 433 is fixedly connected to the housing, and the output end of the power assist motor 41 is drivenly connected to the power assist sun gear 431. The power assist sun gear 431 meshes with the power assist planetary gears 432, and the power assist planetary gears 432 mesh with the power assist ring gear 433. Therefore, the power assist planetary gears 432, as the output end of the power assist planetary gear mechanism 43, are coaxially drivenly connected to the power assist drive gear 421. The power assist drive gear 421 meshes with the power assist driven gear 424, and the power assist driven gear 424 is coaxially fixedly connected to the speed regulating ring gear 323, thereby realizing the transmission of power from the power assist motor 41 to the speed regulating ring gear 323.

[0106] Furthermore, Figure 11 The structure of the power steering assembly 42 shown in the example is similar to... Figure 2 The structure of the power steering assembly 42 shown in the example is different. Figure 11 In the example shown, the power steering assembly 42 includes a power steering drive wheel 421 and a power steering driven wheel 424, wherein the power steering drive wheel 421 is coaxially and fixedly connected to the wheel carrier of the power steering planetary gear 432, and the power steering driven wheel 424 is coaxially and fixedly connected to the speed regulating gear ring 323; while Figure 2In the example shown, the power assist transmission assembly 42 includes a power assist drive wheel 421 and a power assist driven wheel 424. The power assist driven wheel 424 includes a first power assist driven wheel 422 and a second power assist driven wheel 423. The power assist drive wheel 421 is coaxially connected to the output end of the power assist motor 41. The large wheel 4221 of the first power assist driven wheel 422 meshes with the power assist drive wheel 421. The small wheel of the first power assist driven wheel 422 meshes with the second power assist driven wheel 423. The second power assist driven wheel 423 is coaxially fixedly connected to the speed regulating gear ring 323.

[0107] It should be noted that... Figure 11 The example shown is the same as Figure 2 The same part of the example shown can be found in the section on Figure 2 The description will not be repeated here.

[0108] In another embodiment, such as Figure 12 As shown, the Figure 12 The example shown is the same as Figure 11 The difference in the examples shown is that the layout of the assist motor 41 is different. The housing includes a left housing and a right housing. Figure 12 In the example shown, the assist motor 41 is located on the right housing, and the speed regulating motor 31 is located on the left housing. "Left" and "right" are references. Figure 11 The left and right orientation shown could also be adapted for the actual situation of electric-assisted bicycles, with the assist motor 41 located on the left shell and the speed control motor 31 located on the right shell. In short, the assist motor 41 and the speed control motor 31 are located on two different shells. Figure 11 In the example shown, both the power assist motor 41 and the speed control motor 31 are arranged on a single housing. Figure 12 The example shown is compared to Figure 11 The example shown allows the components to be distributed on the two shells of the housing. On the one hand, this makes the housing evenly stressed. On the other hand, it facilitates the balanced layout of the components, makes full use of the space inside the housing, and improves the space utilization rate of the housing. Furthermore, it can also improve the manufacturability of the housing and the whole machine, while facilitating heat dissipation.

[0109] It should be noted that... Figure 12 The example shown is the same as Figure 11 The same part of the example shown can be found in the section on Figure 11 The description will not be repeated here. Figure 12 The example shown is the same as Figure 2 The same part of the example shown can be found in the section on Figure 2 The description will not be repeated here.

[0110] In summary, this application provides three solutions for the speed-regulating planetary gear mechanism 32, such as the solution for the speed-regulating planetary gear mechanism 32. Figure 2 , Figure 6 , Figure 7 , Figure 8 , Figure 11 and Figure 12 The speed-regulating planetary gear mechanism 32 shown in the examples has the same scheme, which is Scheme 1. Figure 5 The example shown is Scheme 2 for the speed-regulating planetary gear mechanism 32; Figure 9 The example shown is Scheme 3 for the speed-regulating planetary gear mechanism 32.

[0111] This application provides two solutions for the power steering assembly 42. Regarding the solution for the power steering assembly 42, Figure 2 , Figure 5 , Figure 6 , Figure 7 , Figure 9 The example shown has the same design for the power steering assembly 42, and is design one. Figure 11 and Figure 12 The example shown has the same design for the power steering assembly 42, and it is design two. Furthermore, Figure 11 and Figure 12 The electric power assist device also includes a power assist planetary gear mechanism 43, which, in conjunction with the corresponding power assist transmission component 42, transmits power to the speed regulating gear ring 323.

[0112] This application provides four clutch solutions, such as Figure 2 The first clutch 61 and the second clutch 62 shown are scheme one. Figure 6 The configuration of the first clutch 61 and the third clutch 63 shown is configuration two. Figure 7 The scheme shown for the first clutch 61 and the fourth clutch 64 is scheme three. Figure 8 The first clutch 61 and the fifth clutch 65 shown are scheme four. These four clutch schemes are not only applicable to their corresponding illustrated examples, but can also be applied to other illustrated examples, which will not be illustrated one by one here.

[0113] It is understood that any combination of different schemes for different speed-regulating planetary gear mechanisms 32, different schemes for the power transmission component 42, different schemes for adding a power planetary gear mechanism 43, and the four clutch schemes based on the schemes disclosed in this application is within the protection scope of this application, and will not be described in detail here.

[0114] This application also provides an electric-assisted bicycle using the above-mentioned power system, which can have an assisted riding mode, an unassisted riding mode, and a fixed speed ratio mode. Specific details will not be elaborated here.

[0115] Next, combine Figure 2The examples shown illustrate the operating status of each component of the power system in both assisted riding mode and unassisted riding mode.

[0116] 1) In assisted riding mode: the second clutch 62 remains disengaged, the first clutch 61 is engaged, the assist motor 41 and the speed control motor 31 are both started, and the total output wheel 2, as the output component of the power system, transmits power to the rear wheel 300.

[0117] During the cyclist's ride, on the one hand, the cyclist's riding power is transmitted through the bottom bracket 1 to the human-driven wheel 51, then to the human-driven wheel 52, and finally to the speed-regulating ring gear 323. That is, the cyclist's riding power participates in the riding in the power-assisted mode, so that the sensor can accurately obtain the cyclist's cadence and pedaling force, and obtain a cadence and pedaling force that are more in line with the cyclist's actual riding state. This makes it easier for the electric power-assisted device to provide electric assistance that is more matched with the pedaling force, and at the same time, it makes it easier for the electric speed-regulating device to provide a gear ratio that is more matched with the cadence, thereby improving the cyclist's riding experience.

[0118] On the other hand, the power assist motor 41 outputs appropriate power based on the data detected by the sensor. This power is transmitted to the speed regulating gear ring 323 via the power assist transmission component 42, which can achieve the effect of speed reduction and torque increase, providing assistance to the rider, reducing the difficulty of riding, and alleviating the rider's fatigue.

[0119] On the other hand, the speed-regulating motor 31 outputs appropriate power to the speed-regulating sun gear 321 based on the data detected by the sensor, thereby determining the output speed of the speed-regulating sun gear 321. When the speed of the speed-regulating ring gear 323 is determined under the rider's cadence, stepless adjustment of the riding speed can be achieved by changing the output speed of the speed-regulating motor 31. Compared with traditional gear shifting, this can also reduce the impact and sudden speed changes caused by shifting gears mechanically, thus improving the rider's riding experience.

[0120] Understandably, regarding Figure 4 As shown in the example, the maximum transmission ratio of the system can be increased by two sets of speed-adjusting planetary gear mechanisms 32 to avoid slippage caused by excessive pedaling force from the rider.

[0121] 2) In the no-assist mode: the second clutch 62 remains wedged, the assist motor 41 and the speed regulating motor 31 are not started, and the total output wheel 2, as the output component of the power system, transmits power to the rear wheel 300.

[0122] During the ride, the rider pedals 500, which causes the bottom bracket 1 to rotate via the crank 400. The bottom bracket 1 then drives the speed-adjusting driven wheel 332 to rotate via the second clutch 62, which in turn drives the main output wheel 2 to rotate. Finally, the power is transmitted to the rear wheel 300, achieving a riding experience comparable to that of a traditional bicycle.

[0123] It should be noted that some electric-assist bicycles offer a trolley-assisted riding mode in addition to the aforementioned assisted riding mode (relying on both human power and electric assistance). In trolley-assisted mode, the rider controls the assist motor 41 and speed-regulating motor 31 by turning the handlebars, thus controlling their output and power ratio, without relying on sensor-collected information such as speed, cadence, and pedaling force. Furthermore, when the electric-assist bicycle is in trolley-assisted mode, both the second clutch 62 and the first clutch 61 are disengaged. This disconnects the power transmission from the human drive wheel 51 to the human driven wheel 52, effectively disconnecting the power transmission from human power to the speed-regulating gear ring 323. The rider then controls the output of both motors by turning the handlebars. This trolley-assisted mode is suitable for reversing, pushing on steep slopes, and overcoming obstacles.

[0124] The foregoing has shown and described 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 way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of this application.

Claims

1. A power system for an electric-assisted bicycle, characterized in that, include: A bottom bracket (1) and a main output wheel (2), wherein the bottom bracket (1) is used to be fixedly connected to the crank (400) of the bicycle, the main output wheel (2) is coaxially arranged with the bottom bracket (1), and the main output wheel (2) is used to be driven connected to the rear wheel (300) of the bicycle; The electric speed control device includes a speed control motor (31), a speed control planetary gear mechanism (32), and a speed control transmission assembly (33). The speed control motor (31) and the speed control planetary gear mechanism (32) are independently external relative to the central shaft (1). The speed control planetary gear mechanism (32) includes a speed control sun gear (321), a speed control planetary gear (322), and a speed control ring gear (323). The speed control motor (31) is coaxially connected to the speed control sun gear (321), and the speed control planetary gear (322) is connected to the total output gear (2) through the speed control transmission assembly (33). The electric power assist device includes a power assist motor (41), which is connected to the speed regulating gear ring (323) in a transmission connection.

2. The power system for an electric-assisted bicycle according to claim 1, characterized in that, It also includes a human-powered transmission assembly (5), which includes a human-powered drive wheel (51) and a human-powered driven wheel (52). The human-powered drive wheel (51) and the human-powered driven wheel (52) are connected in a transmission connection. The human-powered drive wheel (51) is coaxially connected to the central shaft (1) through a first clutch (61), and the human-powered driven wheel (52) is coaxially connected to the speed regulating gear ring (323).

3. The power system for an electric-assisted bicycle according to claim 2, characterized in that, The speed regulating transmission assembly (33) includes a speed regulating drive wheel (331) and a speed regulating driven wheel (332). The speed regulating drive wheel (331) is connected to the speed regulating driven wheel (332) in a driving connection. The speed regulating drive wheel (331) is connected to the speed regulating planetary gear (322) in a driving connection. The speed regulating driven wheel (332) is connected to the total output wheel (2) in a driving connection.

4. The power system for an electric-assisted bicycle according to claim 3, characterized in that, The speed-regulating driven wheel (332) is coaxially connected to the central shaft (1) via a second clutch (62); or The speed-regulating driven wheel (332) is rotatably connected to the central shaft (1). The electric-assisted bicycle power system also includes a housing. The speed-regulating sun gear (321) is rotatably mounted on the housing, and a third clutch (63) is provided between the speed-regulating sun gear (321) and the housing. When the third clutch (63) is engaged, the speed-regulating sun gear (321) is relatively fixed to the housing. When the third clutch (63) is disengaged, the speed-regulating sun gear (321) can rotate relative to the housing. The speed-regulating driven wheel (332) and the human-powered driving wheel (51) are coaxially connected via a fourth clutch (64); or The planetary carrier (3221) of the speed-regulating planetary gear (322) is connected to the speed-regulating ring gear (323) via a fifth clutch (65).

5. The power system for an electric-assisted bicycle according to claim 3, characterized in that, The electric power assist device also includes a power assist transmission assembly (42), which includes a power assist drive wheel (421) and a power assist driven wheel (424). The power assist drive wheel (421) and the power assist driven wheel (424) are connected in a transmission connection. The power assist motor (41) is coaxially connected in a transmission connection with the power assist drive wheel (421), and the power assist driven wheel (424) is connected in a transmission connection with the speed regulating gear ring (323).

6. The power system for an electric-assisted bicycle according to claim 5, characterized in that, The electric assist device also includes an assist planetary gear mechanism (43), which includes an assist sun gear (431), assist planetary gears (432) and an assist ring gear (433). The electric assist bicycle power system also includes a housing, the assist ring gear (433) is fixed to the housing, the assist motor (41) is coaxially connected to the assist sun gear (431), and the assist planetary gears (432) are coaxially connected to the assist drive wheel (421).

7. The power system for an electric-assisted bicycle according to claim 3, characterized in that, The electric power assist device also includes a power assist transmission assembly (42), which includes a power assist drive wheel (421), a power assist first driven wheel (422), and a power assist second driven wheel (423). The power assist drive wheel (421) is connected to the power assist first driven wheel (422), the power assist first driven wheel (422) is connected to the power assist second driven wheel (423), the power assist first driven wheel (422) is coaxially rotated with the central shaft (1), and the power assist second driven wheel (423) is coaxially connected with the speed regulating gear ring (323).

8. The power system for an electric-assisted bicycle according to claim 7, characterized in that, The first driven wheel (422) includes a large wheel (4221) and a small wheel (4222) coaxially connected to the large wheel (4221). The large wheel (4221) is driven to the driving wheel (421), and the small wheel (4222) is driven to the second driven wheel (423).

9. The power system for an electric-assisted bicycle according to any one of claims 3-8, characterized in that, When there are two 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 end of the speed-regulating motor (31), and the speed-regulating sun gear (321) of the first speed-regulating planetary gear mechanism (32) is driven to the output end 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 driven 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 driven to the total output gear (2) through the speed-regulating transmission assembly (33), and the speed-regulating ring gear (323) of the last speed-regulating planetary gear mechanism (32) is driven to the output end of the power assist motor (41); or The speed-regulating planetary gear (322) includes a planetary gear carrier (3221) and a planetary gear set (3222). The planetary gear carrier (3221) is coaxially connected to the speed-regulating drive gear (331). The number of planetary gear sets (3222) is one set, and the planetary gear set (3222) meshes with both the speed-regulating sun gear (321) and the speed-regulating ring gear (323). The speed-regulating planetary gear (322) includes a planetary gear carrier (3221), a planetary gear set (3222), and a connecting shaft (3223). The planetary gear carrier (3221) is coaxially connected to the speed-regulating drive gear (331). There are two sets of planetary gear sets (3222), each of which includes planetary gears. The number of planetary gears in each set is the same as the number of connecting shafts (3223). The corresponding planetary gears in the two sets of planetary gear sets (3222) are respectively connected to the two ends of the connecting shaft (3223). One set of planetary gear sets (3222a) meshes with the speed-regulating sun gear (321), and the other set of planetary gear sets (3222b) meshes with the speed-regulating ring gear (323).

10. An electric-assisted bicycle, characterized in that, It includes a frame (100) and a power system for an electric-assisted bicycle as described in any one of claims 1-9, the power system for the electric-assisted bicycle being mounted on the frame (100).

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