Modular electric power assisting system for bicycle

Abstract

The modularized electric power assisting system comprises a transmission unit module, the transmission unit module comprises a mounting part and a transmission part, the mounting part of the transmission unit module is used for detachably mounting the transmission unit module at a bottom bracket of a bicycle frame, the transmission part comprises a BB shaft and a chain wheel, the BB shaft penetrates through the bottom bracket of the bicycle frame, and the chain wheel is connected with the BB shaft. The chain wheel is mounted on one side of the frame bottom bracket in a transmission manner and is in transmission connection with the BB shaft; the driving unit module is detachably installed on the transmission unit module, and the driving unit module is in transmission connection with the transmission part of the transmission unit module. By means of the transmission unit module which is detachably connected and the driving unit module which can be detachably connected with the transmission unit module, an electric power assisting system can be installed on a conventional bicycle, electric refitting of bicycles on the market is achieved, a special frame structure is not needed, the applicability is high, and the cost is low. The transmission unit modules and the driving unit modules of different models are combined, operation is convenient, cost is low, and use flexibility is high.

Description

Technical Field

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

[0002] Currently, the electric assisted bicycles on the market are mainly divided into hub motor models or mid-mounted motor models. Structurally speaking, the mid-mounted motor model has large torque, good riding experience, and better market prospects. Currently, due to price issues, it has only gradually developed in the domestic market in recent years.

[0003] Due to different market demands, manufacturers are often required to launch different products, which leads to a wide variety of product specifications on the market. For example, different power, different voltage input, different working conditions, different models, etc. Different products require different targeted design solutions. Conventional mid-mounted motor models often require special frame designs and are generally sold at higher prices.

[0004] The existing Chinese patent application document with publication number CN117325974B discloses a high-stability mid-motor electric-assisted mountain bicycle, including a frame, axles, wheels, a cover, a mid-motor, a middle shaft and pedals; the frame is rotatably connected to a plurality of axles; each axle is fixedly connected to a wheel; the frame is fixedly connected to the cover; the cover is equipped with the mid-motor; the output shaft of the mid-motor is fixedly connected to the middle shaft, and the middle shaft passes through the mid-motor and is rotatably connected to the cover; and a plurality of pedals are rotatably connected to the middle shaft.

[0005] The electric power-assisted bicycles in the prior art integrate a mid-mounted motor on the frame, which requires a special frame structure. However, ordinary bicycles are still the most common on the market. The electric power-assisted solutions in the prior art cannot be flexibly used on ordinary bicycle frames, and there is room for improvement. Summary of the invention

[0006] In view of the defects in the prior art, an object of the present invention is to provide a modular electric power-assist system for a bicycle.

[0007] A modular electric power-assist system for a bicycle provided in accordance with the present invention comprises a transmission unit module and a drive unit module, wherein the transmission unit module comprises a mounting portion and a transmission portion, wherein the mounting portion of the transmission unit module is used to detachably mount the transmission unit module on the five-way bracket of a frame, wherein the transmission portion comprises a BB shaft and a chainring, wherein the BB shaft passes through the five-way bracket of the frame, wherein the chainring is transmission-mounted on one side of the five-way bracket of the frame, and wherein the chainring is transmission-connected to the BB shaft; wherein the drive unit module is detachably mounted on the transmission unit module, and wherein the drive unit module is transmission-connected to the transmission portion of the transmission unit module.

[0008] Preferably, the mounting portion of the transmission unit module comprises a transmission unit housing, the transmission unit housing comprises a main body and a mounting shaft, the main body is located at one end of the mounting shaft, one end of the mounting shaft away from the main body penetrates from one end of the frame five-way bracket, and the other end penetrates out; an auxiliary bracket is connected to the end of the mounting shaft away from the main body, the auxiliary bracket extends to the main body and is detachably connected to the main body through a fastener, the end of the mounting shaft away from the main body is threadedly matched with a locking nut, and the locking nut cooperates with the auxiliary bracket to detachably connect the transmission unit housing to the frame five-way bracket.

[0009] Preferably, the transmission part also includes a concave claw-type gear shaft, a transmission gear set and a clutch assembly, and the concave claw-type gear shaft, the transmission gear set and the clutch assembly are all assembled on the mounting part of the transmission unit module; the concave claw-type gear shaft is detachably connected to the output shaft of the drive unit module, the concave claw-type gear shaft is connected to the chainring through the transmission gear set and the clutch assembly, and the BB shaft is connected to the chainring through the clutch assembly.

[0010] Preferably, the clutch assembly includes a gear clutch, a clutch body and a clutch lining, the clutch lining is fixedly connected to the BB shaft, the clutch body is sleeved on the outer circle of the clutch lining, the gear clutch is sleeved on the clutch body, and the toothed plate is fixedly connected to the outer circle of the gear clutch.

[0011] Preferably, the transmission gear set comprises a transmission gear shaft and a transmission gear, the transmission gear shaft and the transmission gear are fixedly connected, the concave claw-type gear shaft is meshed with the transmission gear, and the transmission gear shaft is meshed with the tooth portion of the gear clutch.

[0012] Preferably, the BB shaft coaxially passes through the gear clutch, and the BB shaft is rotationally matched with the gear clutch through a bearing.

[0013] Preferably, the installation portion of the transmission unit module is provided with a drive unit module installation site, and the drive unit module is detachably connected to the installation site of the transmission unit module installation portion through a fastener;

[0014] The output shaft of the drive unit module is a claw-type external spline motor shaft, and the claw-type external spline motor shaft is male-female matched with a concave claw-type gear shaft.

[0015] Preferably, the drive unit module mounting site on the mounting portion of the transmission unit module is located in the middle or lower portion of the five-way bracket of the frame.

[0016] Preferably, the output voltage of the drive unit module includes 24V, 36V or 48V.

[0017] Preferably, a control system is integrated in the drive unit module, or the drive unit module is electrically connected to an external control system.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention realizes the installation of an electric power assist system on a conventional bicycle through a transmission unit module detachably connected to the five-way connection of the frame and a drive unit module detachably connected to the transmission unit module, and realizes the electric modification of bicycles on the market without requiring a special frame structure, and has strong applicability. Moreover, the transmission unit module and the drive unit module of different models can be combined, which is convenient to operate, low in cost, and highly flexible in use.

[0020] 2. The present invention realizes the installation of the transmission unit module at the five-way joint of the frame through an auxiliary bracket and a locking nut. When a modular motor is used, there is no need to disassemble the transmission unit module related to the frame. Only a drive unit module adapted thereto needs to be replaced. The drive unit solutions have greater power, high torque at low speed, uniform speed and energy saving, and a variety of configuration options, which can reduce travel costs without the need to replace the entire machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0022] Figure 1 It is an exploded schematic diagram of a modular electric power assist system mainly embodied in the present invention;

[0023] Figure 2 This is an exploded schematic diagram of the transmission unit module installation structure mainly embodied in the present invention;

[0024] Figure 3 This is an exploded view of the installation structure of the transmission unit module on the five-way bracket of the frame, which mainly embodies the present invention;

[0025] Figure 4 This is a schematic diagram of the overall structure of the transmission unit module mainly embodied in the present invention;

[0026] Figure 5 This is a schematic diagram of the structure of the transmission unit module installation part mainly embodied in the present invention;

[0027] Figure 6 This is a schematic diagram of the transmission unit module transmission structure of the present invention;

[0028] Figure 7 This is a schematic diagram of the overall structure of the drive unit module mainly embodied in the present invention;

[0029] Figure 8This is an exploded view of the overall structure of the drive unit module mainly embodied in the present invention.

[0030] As shown in the figure:

[0031] Transmission unit module 1 Clutch body 13

[0032] Drive unit module 2 Clutch lining 14

[0033] Frame 3 BB axle 15

[0034] Concave claw gear shaft 5 Transmission gear shaft 16

[0035] Auxiliary bracket 6 Transmission gear 17

[0036] Lock nut 7 Claw type external spline motor shaft 18

[0037] Mounting screw 8 Drive unit stator 19

[0038] Transmission unit housing 9 Drive unit screw 20

[0039] Transmission unit cover 10 Drive unit cover 21

[0040] Chainring 11 Drive unit rotor 22

[0041] Gear clutch 12 Drive unit housing 23 DETAILED DESCRIPTION

[0042] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0043] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 as well as Figure 8As shown, a modular electric power assist system for a bicycle provided by the present invention includes a transmission unit module 1 and a drive unit module 2. The transmission unit module 1 includes a mounting portion and a transmission portion. The mounting portion of the transmission unit module 1 is used to detachably mount the transmission unit module 1 at the five-way of the frame 3. The transmission portion includes a BB shaft 15 and a chainring 11. The BB shaft 15 passes through the five-way of the frame 3. The chainring 11 is transmission-mounted on one side of the five-way of the frame 3, and the chainring 11 is transmission-connected to the BB shaft 15. The drive unit module 2 is detachably mounted on the transmission unit module 1, and the drive unit module 2 is transmission-connected to the transmission portion of the transmission unit module 1.

[0044] The technical solution of the present application utilizes a transmission unit module 1 that can be detachably connected to the five-way bracket of the frame 3 and a drive unit module 2 that can be detachably connected to the transmission unit module 1, so as to realize the installation of an electric power assist system on a conventional bicycle, realize the electric modification of bicycles on the market, and does not require a special frame 3 structure, and has strong applicability. Moreover, the transmission unit module 1 and the drive unit module 2 of different models can be combined, which is convenient to operate, low in cost, and highly flexible in use.

[0045] Specifically, the mounting portion of the transmission unit module 1 includes a transmission unit housing 9, and the transmission unit housing 9 includes a main body and a mounting shaft. The main body is located at one end of the mounting shaft, and the end of the mounting shaft away from the main body penetrates from one end of the five-way bracket of the frame 3, and the other end penetrates. The end of the mounting shaft away from the main body is connected to an auxiliary bracket 6, which extends to the main body and is detachably connected to the main body through a fastener. The end of the mounting shaft away from the main body is threadedly matched with a locking nut 7, and the locking nut 7 cooperates with the auxiliary bracket 6 to detachably connect the transmission unit housing 9 to the five-way bracket of the frame 3. Further, in a feasible embodiment: the auxiliary bracket 6 includes an integrally formed annular portion, an intermediate connecting portion, and a terminal mounting portion, the annular portion is located at one end of the intermediate connecting portion, and the terminal mounting portion is located at the other end of the intermediate connecting portion, the annular portion is sleeved on the end of the mounting shaft away from the main body, the intermediate connecting portion extends along the axial direction of the five-way bracket of the frame 3 outside the five-way bracket of the frame 3, and the terminal mounting portion is fixedly connected to the main body of the transmission unit housing 9 by mounting screws 8. The end of the mounting shaft away from the main body is provided with a thread, the locking nut 7 is threadedly connected to the end of the mounting shaft away from the main body, and the locking nut 7 presses the annular portion of the auxiliary bracket 6 onto the end surface of the five-way of the frame 3. The detachable connection of the transmission unit module 1 on the frame 3 is realized.

[0046] More specifically, the transmission part also includes a concave claw gear shaft 5, a transmission gear 17 group and a clutch assembly, and the concave claw gear shaft 5, the transmission gear 17 group and the clutch assembly are all assembled on the mounting portion of the transmission unit module 1. The concave claw gear shaft 5 is detachably connected to the output shaft of the drive unit module 2, the concave claw gear shaft 5 is connected to the chainring 11 through the transmission gear 17 group and the clutch assembly, and the BB shaft 15 is connected to the chainring 11 through the clutch assembly. The user can drive the BB shaft 15 to rotate by pedaling, and then drive the chainring 11 to rotate through the clutch assembly to ride. The motor drives the chainring 11 to rotate through the transmission gear 17 group and the clutch assembly to assist riding.

[0047] Specifically, in a preferred embodiment, the clutch assembly includes a gear clutch 12, a clutch body 13 and a clutch lining 14, the clutch lining 14 is fixedly connected to the BB shaft 15, the clutch body 13 is sleeved on the outer circle of the clutch lining 14, the gear clutch 12 is sleeved on the clutch body 13, and the toothed disc 11 is fixedly connected to the outer circle of the gear clutch 12. The clutch lining 14 and the clutch body 13 form a wedge clutch, and the wedge clutch cooperates with the gear clutch 12 to form a dual clutch system, ensuring that the BB shaft 15 will not be stuck when rotating forward or reverse. The transmission gear 17 group includes a transmission gear shaft 16 and a transmission gear 17, the transmission gear shaft 16 and the transmission gear 17 are coaxially fixedly connected, the concave claw gear shaft 5 is meshed with the transmission gear 17, and the transmission gear shaft 16 is meshed with the teeth of the gear clutch 12. The BB shaft 15 coaxially passes through the gear clutch 12, and the BB shaft 15 is rotated with the gear clutch 12 through a bearing.

[0048] It should be noted that the concave claw-type gear shaft 5, the transmission gear 17 group and the clutch assembly are all arranged in the main body of the transmission unit housing 9, the tooth plate 11 is located on the side of the main body of the transmission unit housing 9 away from the mounting shaft, and there is a matching gap between the tooth plate 11 and the main body of the transmission unit housing 9 to ensure the stability of the rotation of the tooth plate 11. The BB shaft 15 is rotatably connected to the inner cavity of the gear clutch 12 through a bearing, and the BB shaft 15 is also rotatably connected to the inner cavity of the mounting shaft of the transmission unit housing 9 through a bearing, so that the BB shaft 15 is stably installed.

[0049] The technical solution of the present application uses a dual clutch system, which, on the one hand, prevents the rotation of the BB shaft 15 from interfering with the assistance of the motor, and on the other hand, prevents the BB shaft 15 from getting stuck during forward or reverse rotation.

[0050] Furthermore, the mounting portion of the transmission unit module 1 is provided with a mounting site of the drive unit module 2, and the drive unit module 2 is detachably connected to the mounting site of the mounting portion of the transmission unit module 1 through a fastener. The output shaft of the drive unit module 2 is a claw-type external spline motor shaft 18, and the claw-type external spline motor shaft 18 is male-female matched with the concave claw-type gear shaft 5. With the help of the detachable mounting method of the drive unit module 2 and the transmission unit module 1, the male-female match of the claw-type external spline motor shaft 18 and the concave claw-type gear shaft 5, the transmission unit module 1 can be installed on the frame 3 first during installation, and then different drive unit modules 2 can be installed according to needs. For example: the output voltage of the drive unit module 2 includes 24V, 36V or 48V, and the drive unit module 2 with the corresponding output voltage is selected according to needs. A modular combination design is formed. The transmission unit cover 10 is installed on the side of the transmission unit housing 9 away from the crankset 11.

[0051] In a variation of the embodiment, the transmission unit module 1 and the drive unit module 2 are connected to the coupling via the concave claw gear shaft 5 to achieve the transmission of power from the drive unit to the transmission unit.

[0052] In a feasible implementation manner: the drive unit module 2 includes a drive unit stator 19, a drive unit screw 20, a drive unit cover 21, a drive unit rotor 22, and a drive unit housing 23; the drive unit housing 23 is fixedly connected to the drive unit module 2 mounting site of the mounting portion of the transmission unit module 1 through the drive unit screw 20, the drive unit stator 19 and the drive unit rotor 22 are arranged in the drive unit housing 23, and the drive unit cover 21 is fixedly connected to the drive unit housing 23. The claw-type external spline motor shaft 18 is fixedly connected to the drive unit rotor 22, and the claw-type external spline motor shaft 18 extends from the inside of the drive unit housing 23 as the output shaft of the drive unit module 2.

[0053] In a preferred embodiment, the installation position of the drive unit module 2 on the installation portion of the transmission unit module 1 is located in the middle or lower part of the five-way bracket of the frame 3 .

[0054] During installation, the transmission unit module 1 is first inserted into the five-way position of the bicycle. At this time, the transmission unit and the frame 3 form a fixed structure and can be regarded as a whole. At this time, the deceleration system of the electric assisted bicycle has been assembled. The drive unit module 2 is combined and installed with the transmission unit module 1 by screw fastening to form a complete supporting product. When the demand is adjusted, it can be met by replacing different modules. The transmission unit and the drive unit system are made into different module solutions respectively. According to different needs, partial replacement can be made during installation, which can cope with different scenarios and needs.

[0055] Specifically, the transmission unit module 1 is preliminarily installed on the five-way bracket of the frame 3, and then the auxiliary bracket 6 is installed on the transmission unit module 1, and the auxiliary bracket 6 and the transmission unit module 1 are fastened together with screws, and then the transmission unit module 1 passing through the five-way bracket of the frame 3 is fastened with the locking nut 7. At this time, the transmission unit module 1 has been firmly combined with the frame 3 to form a whole; at this time, the transmission unit module 1 has been assembled.

[0056] Without the drive unit module 2, the bicycle is currently unable to achieve the electric power function, and the drive unit module 2 needs to be installed later according to the needs of the entire system. For example, if the vehicle uses a 24V system (it may also be 36V or 48V, etc.), then the 24V drive unit module 2 is preliminarily matched through the (claw-type external spline motor shaft 18 and the concave claw-type gear shaft 5 (a part of the transmission unit), and then fastened together with the transmission unit module 1 through the drive unit screws 20. At this time, the modular motor has been assembled. Regardless of whether the customer chooses a 36V or 48V system later, the transmission unit module 1 does not need to be disassembled, and only the drive unit module 2 needs to be replaced; the left and right cranks and pedals are subsequently installed to complete the system connection.

[0057] It should be noted that a control system is integrated in the drive unit module 2, or the drive unit module 2 is electrically connected to an external control system.

[0058] Furthermore, the technical solution of the present application is convenient for consumers to select and reduce costs. If consumers need a mid-mounted motor for long-distance travel, short-distance urban commuting, or certain off-road needs, they do not need to purchase 2 to 3 mid-mounted motors separately to reinstall them, as is the case with the motors in the existing market. With this modular motor, there is no need to disassemble the transmission unit module 1 related to the frame 3. It is only necessary to replace the drive unit module 2 that is compatible with it. The drive unit solutions have greater power, low-speed high torque, uniform speed energy saving, and other drive unit solutions, and the configuration options are diversified. Since the product is generally sold at a high price, the travel cost can be reduced in this regard without the need to replace the entire machine as before. For manufacturers, the product has been reduced in cost from the technical solution. When the product is produced, the transmission unit manufacturing link is not restricted by the drive unit. On the contrary, it is not necessary to have uneven materials and unable to produce like the traditional manufacturing link. The transmission unit and the drive unit are separately stocked and assembled and produced; inventory management greatly improves production efficiency and facilitates after-sales maintenance.

[0059] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0060] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A modular electric power assist system for a bicycle, characterized in that: It comprises a transmission unit module and a drive unit module, wherein the transmission unit module comprises a mounting portion and a transmission portion, wherein the mounting portion of the transmission unit module is used to detachably mount the transmission unit module on the five-way bracket of the frame, wherein the transmission portion comprises a BB shaft and a chainring, wherein the BB shaft passes through the five-way bracket of the frame, wherein the chainring is transmission-mounted on one side of the five-way bracket of the frame, and wherein the chainring is transmission-connected to the BB shaft; The driving unit module is detachably mounted on the transmission unit module, and the driving unit module is transmission-connected to the transmission part of the transmission unit module.

2. The modular electric power assist system for a bicycle according to claim 1, characterized in that: The mounting portion of the transmission unit module comprises a transmission unit housing, the transmission unit housing comprises a main body and a mounting shaft, the main body is located at one end of the mounting shaft, one end of the mounting shaft away from the main body penetrates from one end of the frame five-way and the other end penetrates out; An auxiliary bracket is connected to one end of the mounting shaft away from the main body, and the auxiliary bracket extends to the main body and is detachably connected to the main body through a fastener. The end of the mounting shaft away from the main body is threadedly engaged with a locking nut, and the locking nut and the auxiliary bracket cooperate to detachably connect the transmission unit housing to the five-way bracket of the frame.

3. The modular electric power assist system for a bicycle according to claim 1, characterized in that: The transmission part also includes a concave claw-type gear shaft, a transmission gear set and a clutch assembly, and the concave claw-type gear shaft, the transmission gear set and the clutch assembly are all assembled on the mounting part of the transmission unit module; The concave claw-type gear shaft is detachably connected to the output shaft of the drive unit module, the concave claw-type gear shaft is connected to the chainring through a transmission gear set and a clutch assembly, and the BB shaft is connected to the chainring through a clutch assembly.

4. The modular electric power assist system for a bicycle as claimed in claim 3, characterized in that: The clutch assembly includes a gear clutch, a clutch body and a clutch lining, wherein the clutch lining is fixedly connected to the BB shaft, the clutch body is sleeved on the outer circle of the clutch lining, the gear clutch is sleeved on the clutch body, and the toothed plate is fixedly connected to the outer circle of the gear clutch.

5. The modular electric power assist system for a bicycle according to claim 4, characterized in that: The transmission gear set comprises a transmission gear shaft and a transmission gear, wherein the transmission gear shaft and the transmission gear are fixedly connected, the concave claw-shaped gear shaft is meshed with the transmission gear, and the transmission gear shaft is meshed with the toothed portion of the gear clutch.

6. The modular electric power assist system for a bicycle as claimed in claim 3, characterized in that: The BB shaft coaxially passes through the gear clutch, and the BB shaft is rotationally matched with the gear clutch through a bearing.

7. The modular electric power assist system for a bicycle according to claim 1, characterized in that: The installation portion of the transmission unit module is provided with a drive unit module installation site, and the drive unit module is detachably connected to the installation site of the transmission unit module installation portion through a fastener; The output shaft of the drive unit module is a claw-type external spline motor shaft, and the claw-type external spline motor shaft is male-female matched with a concave claw-type gear shaft.

8. The modular electric power assist system for a bicycle according to claim 7, characterized in that: The drive unit module mounting site on the mounting portion of the transmission unit module is located at the middle or lower portion of the five-way bracket of the frame.

9. The modular electric power assist system for a bicycle according to claim 1, characterized in that: The output voltage of the drive unit module includes 24V, 36V or 48V.

10. The modular electric power assist system for a bicycle according to claim 1, characterized in that: The drive unit module is integrated with a control system, or the drive unit module is electrically connected to an external control system.

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