Small-size middle-arranged power-assisted motor and bicycle

Abstract

The utility model discloses a small-size middle-arranged power-assisted motor and a bicycle. The motor comprises a motor body, a speed reduction structure and a clutch structure. The speed reduction structure comprises at least two planetary gear assemblies and a synchronous gear set, and the planetary gear assemblies are located between the motor body and the synchronous gear set. The clutch structure is connected between the planetary gear assembly and the synchronous gear set. The sun gear of the planetary gear assembly closest to the motor body is fixedly connected with a rotor or a rotating shaft of the motor body; in two adjacent groups of planetary gear assemblies, the planet carrier of the planetary gear assembly closer to the motor body is coaxially and fixedly connected with the sun gear of the planetary gear assembly closer to the synchronous gear set; the clutch structure is connected between the planet carrier of the planet gear assembly closest to the synchronous gear set and one synchronous gear of the synchronous gear set. The power-assisted motor has the advantages of being small in size and small in occupied space.

Description

Technical Field

[0001] This utility model relates to power assist motors, specifically to a small, mid-mounted power assist motor and a bicycle. Background Technology

[0002] In recent years, mountain bikes have seen rapid growth in the consumer market. These bikes primarily use a drive motor for propulsion, and existing models typically require the addition of a motor to the frame, rear wheel, or bottom bracket. Because existing motors are relatively large, installation usually necessitates modifications to the frame or the use of a specialized frame, increasing installation complexity and production costs.

[0003] For example, the utility model patent with authorization announcement number CN 221293990U discloses a centrally located external power transmission mechanism for a power-assisted bicycle. This mechanism ensures that when the motor has no power supply, the rider's pedaling will not drive the driven gear or the motor's output shaft, shortening the transmission chain and making riding more effortless compared to an electric bicycle. Furthermore, in conjunction with its… Figure 1 -4. In order to obtain the desired reduction ratio, the diameter of the driven gear 3-2 is set to be relatively large. This will result in a larger overall motor size, a bulky structure, and a large space occupation, which needs to be optimized. Utility Model Content

[0004] The purpose of this invention is to overcome the above-mentioned problems and provide a small-sized, mid-mounted assist motor, which has the advantages of small size and small space occupation.

[0005] Another objective of this invention is to provide a bicycle.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] A small, mid-mounted power assist motor includes a motor body, a reduction gear structure, and a clutch structure;

[0008] The reduction structure includes a planetary gear assembly and a synchronous gear set, wherein the planetary gear assembly has at least two sets and is located between the motor body and the synchronous gear set;

[0009] The clutch mechanism connects the planetary gear assembly and the synchronous gear set.

[0010] In a preferred embodiment of this utility model, the sun gear of the planetary gear assembly closest to the motor body is fixedly connected to the rotor or shaft of the motor body; in two adjacent planetary gear assemblies, the planet carrier of the planetary gear assembly closer to the motor body is coaxially and fixedly connected to the sun gear of the planetary gear assembly closer to the synchronous gear set.

[0011] The clutch mechanism is connected between the planet carrier of the planetary gear assembly closest to the synchronizing gear set and one of the synchronizing gears of the synchronizing gear set.

[0012] In a preferred embodiment of this utility model, the motor body includes a stator and a rotor, both of which are housed within an integrated housing.

[0013] Furthermore, the rotor is fixedly connected to the motor shaft, which is integrally formed with the sun gear of the planetary gear assembly closest to the motor body.

[0014] Furthermore, a mounting base is provided inside the integrated housing, which is fixed within the housing; the motor shaft is rotatably connected to the inner cavity of the mounting base via several first rotary bearings. This provides stable support, making the structure more robust, preventing excessive vibration during rotation, increasing durability, and reducing labor requirements.

[0015] In a preferred embodiment of the present invention, the planetary gear assembly is provided in two sets, and the two sets of planetary gear assemblies are arranged in a direction parallel to the axis of the motor body.

[0016] In a preferred embodiment of this utility model, each planetary gear assembly includes a ring gear, a sun gear, planet gears, and a planet carrier.

[0017] In a preferred embodiment of this utility model, the synchronous gear set includes a first synchronous gear and a second synchronous gear. The clutch structure is provided between the first synchronous gear and the planet carrier of the planetary gear assembly closest to the synchronous gear set. The first synchronous gear is coaxial with the motor body, and the second synchronous gear is coaxial with the gear sprocket.

[0018] Furthermore, a second rotary bearing is provided between the inner side of the first synchronous gear and the end of the integrated housing, and a third rotary bearing is provided between the outer side of the first synchronous gear and the inner wall of the integrated housing.

[0019] In a preferred embodiment of this utility model, a fourth rotary bearing is provided between the outer side of the planet carrier of the planetary gear assembly closest to the synchronous gear set and the inner wall of the integral housing, and a fifth rotary bearing is provided between the inner side of the planet carrier and the central rotating shaft, wherein the central rotating shaft and the sun gear corresponding to the planet carrier are integrally formed.

[0020] With the above structure, several bearings are set on the inner and outer sides of the first synchronous gear and the planetary carrier, which can provide stable support, making the reduction structure more robust, preventing excessive vibration during rotation, making it more durable, and also more labor-saving.

[0021] In a preferred embodiment of this utility model, the clutch structure includes a one-way bearing, which is fixedly disposed between the first synchronous gear and the planet carrier of the planetary gear assembly closest to the synchronous gear set.

[0022] A bicycle including the aforementioned small, mid-mounted power assist motor.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] The small, mid-mounted power assist motor of this invention uses a multi-stage planetary gear assembly for deceleration, optimizing the deceleration structure. The deceleration ratio requirement is met before the clutch mechanism, so there is no need for deceleration through the subsequent synchronous gear set. This allows for a reduction in the diameter of the synchronous gear connected to the crankshaft, thereby reducing the overall size of the motor and the space it occupies. Attached Figure Description

[0025] Figure 1 This is a cross-sectional view of the small-sized, mid-mounted power assist motor, chainring, and crank of this utility model. The thick solid lines in the figure represent the power transmission path.

[0026] Figure 2 This is a three-dimensional structural diagram of the small-sized mid-mounted power assist motor, chainring, and crank of this utility model, with the integrated outer shell hidden in the diagram. Detailed Implementation

[0027] To enable those skilled in the art to fully understand the technical solution of this utility model, the present utility model will be further described below in conjunction with the embodiments and accompanying drawings, but the implementation of this utility model is not limited thereto.

[0028] Combination Figures 1-2 The bicycle of this embodiment includes a small-sized mid-mounted power assist motor, which includes a motor body, a reduction structure and a clutch structure; wherein, the motor body includes a stator 1 and a rotor 2, both of which are housed in an integral housing 3, and the rotor 2 is fixedly connected to a motor shaft 4, which is integrally formed with the sun gear 8 of the planetary gear assembly closest to the motor body.

[0029] Furthermore, the integrated housing 3 is also provided with a mounting base 5, which is fixed inside the integrated housing 3; the motor shaft 4 is rotatably connected to the inner cavity of the mounting base 5 through several first rotating bearings 6. In this way, stable support can be provided, making the structure more robust, preventing excessive vibration during rotation, making it more durable, and also more labor-saving.

[0030] Combination Figures 1-2The reduction structure includes planetary gear assemblies and synchronous gear sets. At least two planetary gear assemblies are provided and located between the motor body and the synchronous gear set. Each planetary gear assembly includes a ring gear 7, a sun gear 8, planet gears 9, and a planet carrier 10. Specifically, there are two sets of planetary gear assemblies, arranged parallel to the axis of the motor body. The sun gear 8 of the planetary gear assembly closest to the motor body is fixedly connected to the rotor 2 or shaft of the motor body. In two adjacent sets of planetary gear assemblies, the planet carrier 10 of the planetary gear assembly closer to the motor body is coaxially and fixedly connected to the sun gear 8 of the planetary gear assembly closer to the synchronous gear set.

[0031] Combination Figures 1-2 The synchronous gear set includes a first synchronous gear 11 and a second synchronous gear 12. The clutch structure is provided between the first synchronous gear 11 and the planet carrier 10 of the planetary gear assembly closest to the synchronous gear set. The first synchronous gear 11 is coaxial with the motor body, and the second synchronous gear 12 is coaxial with the gear sprocket.

[0032] Combination Figures 1-2 The clutch structure includes a one-way bearing 13, which is fixedly disposed between the first synchronous gear 11 and the planet carrier 10 of the planetary gear assembly closest to the synchronous gear set.

[0033] Combination Figures 1-2 A second rotary bearing 14 is provided between the inner side of the first synchronous gear 11 and the end of the integrated housing 3, and a third rotary bearing 15 is provided between the outer side of the first synchronous gear 11 and the inner wall of the integrated housing 3.

[0034] Combination Figures 1-2 A fourth rotary bearing 16 is provided between the outer side of the planet carrier 10 closest to the planetary gear assembly and the inner wall of the integral housing 3. A fifth rotary bearing 18 is provided between the inner side of the planet carrier 10 and the central rotating shaft 17. The central rotating shaft 17 is integrally formed with the sun gear 8 corresponding to the planet carrier 10.

[0035] With the above structure, several bearings are set on the inner and outer sides of the first synchronous gear 11 and the planetary carrier 10, which can provide stable support, making the reduction structure more robust, preventing excessive vibration during rotation, making it more durable, and also more labor-saving.

[0036] Combination Figures 1-2 The working principle of the aforementioned small-sized, mid-mounted assist motor is as follows:

[0037] During operation, in electric power assist mode, the motor drives the first-stage sun gear 8, the closest planetary gear assembly to the motor body, to rotate. This sun gear 8 then transmits power to the first-stage planetary gears 9 and 10, and then to the second-stage sun gear 8 via the first-stage planetary carrier 10; this process continues, transmitting power stage by stage while simultaneously achieving deceleration. Finally, the power is transmitted through the clutch mechanism to the first synchronous gear 11, and then to the second synchronous gear 12, which in turn drives the sprocket to rotate. In manual power assist mode, the clutch mechanism is slipping, and the driving force is not transmitted to the deceleration mechanism or the motor body, thus not affecting the motor body.

[0038] The above are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above content. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

Claims

1. A small-sized, mid-mounted assist motor, comprising a motor body, a reduction gear structure, and a clutch structure; characterized in that, The reduction structure includes a planetary gear assembly and a synchronous gear set, wherein the planetary gear assembly has at least two sets and is located between the motor body and the synchronous gear set; The clutch mechanism connects the planetary gear assembly and the synchronous gear set.

2. The small-sized, mid-mounted assist motor according to claim 1, characterized in that, The sun gear of the planetary gear assembly closest to the motor body is fixedly connected to the rotor or shaft of the motor body; in two adjacent planetary gear assemblies, the planet carrier of the planetary gear assembly closer to the motor body is coaxially and fixedly connected to the sun gear of the planetary gear assembly closer to the synchronous gear set. The clutch mechanism is connected between the planet carrier of the planetary gear assembly closest to the synchronizing gear set and one of the synchronizing gears of the synchronizing gear set.

3. The small-sized, mid-mounted assist motor according to claim 1, characterized in that, The motor body includes a stator and a rotor, both of which are housed within an integrated housing; The rotor is fixedly connected to the motor shaft, which is integrally formed with the sun gear of the planetary gear assembly closest to the motor body.

4. The small-sized, mid-mounted assist motor according to claim 3, characterized in that, The integrated housing is further provided with a mounting base, which is fixed inside the integrated housing; the motor shaft is rotatably connected to the inner cavity of the mounting base through a plurality of first rotary bearings.

5. The small-sized, mid-mounted assist motor according to claim 1, characterized in that, The planetary gear assembly has two sets, and the two sets of planetary gear assemblies are arranged in a direction parallel to the axis of the motor body.

6. The small-sized, mid-mounted assist motor according to claim 1, characterized in that, The synchronous gear set includes a first synchronous gear and a second synchronous gear. The clutch structure is provided between the first synchronous gear and the planet carrier of the planetary gear assembly closest to the synchronous gear set. The first synchronous gear is coaxial with the motor body, and the second synchronous gear is coaxial with the gear sprocket.

7. The small-sized, mid-mounted assist motor according to claim 6, characterized in that, A second rotary bearing is provided between the inner side of the first synchronous gear and the end of the integrated housing, and a third rotary bearing is provided between the outer side of the first synchronous gear and the inner wall of the integrated housing.

8. The small-sized, mid-mounted assist motor according to claim 1, characterized in that, A fourth rotary bearing is provided between the outer side of the planet carrier of the planetary gear assembly closest to the synchronous gear set and the inner wall of the integrated housing. A fifth rotary bearing is provided between the inner side of the planet carrier and the central shaft. The central shaft is integrally formed with the sun gear corresponding to the planet carrier.

9. The small-sized, mid-mounted assist motor according to claim 6, characterized in that, The clutch structure includes a one-way bearing, which is fixedly disposed between the first synchronizing gear and the planet carrier of the planetary gear assembly closest to the synchronizing gear set.

10. A bicycle, characterized in that, Including the small-sized, mid-mounted assist motor as described in any one of claims 1-9.

Images