A coaxial planetary gear structure bicycle assisting mechanism

Abstract

The utility model relates to a bicycle drive device technical field, specifically disclose a coaxial planetary row structure bicycle power assisting mechanism, including long axle, be equipped with the casing group on long axle, be equipped with motor assembly and planetary row gear mechanism between long axle and casing group, long axle passes through casing group, motor assembly and planetary row gear mechanism, long axle and casing group, motor assembly and planetary row gear mechanism coaxial arrangement, long axle is connected with the sprocket of casing outside, planetary row gear mechanism is located between motor assembly and sprocket, planetary row gear mechanism includes retainer, a plurality of planetary wheel, sun wheel and the inner tooth ring of connecting on casing group, a plurality of planetary wheel and inner tooth ring engage, long axle is equipped with the ratchet mechanism and sensor in the retainer, and the motor shaft in motor assembly is connected through one -way bearing between sun wheel. The power assisting mechanism in scheme can improve space utilization, reduce the weight of car body, shorten axial space.

Description

Technical Field

[0001] This utility model relates to the field of bicycle drive device technology, and specifically provides a coaxial planetary gear structure bicycle power assist mechanism. Background Technology

[0002] Bicycles are a very practical and environmentally friendly means of transportation, and their usage and popularity are becoming increasingly widespread, with more and more enthusiasts. However, in cities in the south with many hills, the terrain with many hills and slopes makes cycling more difficult, and single human-powered bicycles are difficult to meet the needs of efficient cycling. The promotion of single human-powered bicycles has been greatly limited. Therefore, electric bicycles are needed to solve the problem of bicycle use in the hilly and mountainous areas of the south.

[0003] Currently, bicycle power assist mechanisms typically combine a motor with a parallel shaft reducer. While this structure is simple, it suffers from problems such as large axial space, low space utilization, and high weight, increasing costs and hindering overall space utilization of the bicycle frame. Therefore, there is a need to design a bicycle power assist mechanism that can shorten axial space, improve space utilization, and reduce weight. Utility Model Content

[0004] To solve the above problems, this utility model provides a coaxial planetary gear structure bicycle assist mechanism that can meet the assist needs of bicycles in hilly areas, improve space utilization, and reduce the overall weight of the bicycle.

[0005] This utility model provides a coaxial planetary gear structure bicycle assist mechanism, including a long shaft for connecting the pedals on both sides of the bicycle. A housing assembly is mounted on the long shaft. A motor assembly and a planetary gear mechanism are located between the long shaft and the housing assembly. The long shaft passes through the housing assembly, the motor assembly, and the planetary gear mechanism, and is coaxially arranged with these components. A sprocket located outside the housing assembly is connected to the long shaft. The planetary gear mechanism is located between the motor assembly and the sprocket. The planetary gear mechanism includes a cage, planetary gears mounted on the cage, a sun gear meshing with the planetary gears, and an internal gear ring connected to the housing assembly. The planetary gears mesh with the internal gear ring. A ratchet mechanism and a sensor are located within the cage on the long shaft. The cage is connected to the long shaft via the ratchet mechanism, and its outer end extends to the outside of the housing assembly and connects to the sprocket. The motor shaft in the motor assembly extends inside the cage and is located on the side of the ratchet mechanism away from the sprocket. The motor shaft in the motor assembly is connected to the sun gear via a one-way bearing.

[0006] Furthermore, the housing assembly includes a front housing, a rear housing, and a middle housing located between the front housing and the rear housing. The motor assembly is located within the front housing, and the motor shaft of the motor assembly extends into the middle housing and the rear housing. A connecting bearing is included between the middle housing and the motor shaft.

[0007] Furthermore, the cage includes a main frame body located within the rear housing and a rear frame body extending from one end of the main frame body near the sprocket into the sprocket; a ratchet mechanism is located between the rear frame body and the long shaft.

[0008] Furthermore, the sun gear, one-way bearing, planet gears, and internal gear ring are all located inside the rear housing.

[0009] Furthermore, the housing assembly is provided with a front cover and a rear cover at both ends, with the rear cover located between the front cover and the sprocket, and a connecting bearing 2 between the front cover and the long shaft.

[0010] Furthermore, the rear frame extends through the rear housing and into the sprocket, with a connecting bearing 3 between the rear housing and the rear frame.

[0011] Furthermore, the cage includes multiple connecting rods evenly distributed circumferentially along its long axis, each connecting rod having a planetary gear, all of which mesh with the sun gear.

[0012] Furthermore, the outer diameter of the front housing is smaller than that of the rear housing, the outer diameter of the front cover is smaller than that of the rear cover, and the outer diameter of the rear cover is smaller than that of the sprocket.

[0013] Furthermore, the planetary gear set mechanism can be a single-stage planetary gear set mechanism, a two-stage planetary gear set mechanism, or a multi-stage planetary gear set mechanism.

[0014] Compared with the prior art, the present invention can achieve the following beneficial effects:

[0015] 1. This utility model greatly shortens the axial space of the first-stage gear width by combining a motor with a coaxial planetary gear structure, improves space utilization, reduces the difficulty of riding in hilly areas, and has a simple structure that can reduce weight by about 10%.

[0016] 2. This utility model connects a planetary gear set mechanism to a motor structure. The planetary gear set mechanism is not limited to a single stage and can be used in combination with multiple stages to increase the speed ratio. The position of the one-way bearing remains unchanged. The motor shaft and the sun gear are connected through the one-way bearing. The position of the ratchet mechanism remains unchanged. The ratchet mechanism ensures the connection between the cage and the long shaft. When the motor is driven, the speed of the motor shaft is greater than the speed of the sun gear. The one-way bearing plays the role of transmitting torque and speed. When the speed of the sun gear is greater than or equal to the speed of the motor, the one-way bearing rotates freely and does not transmit any speed or torque.

[0017] 3. When there is no power, this invention allows for input via the cage and output via the sun gear. At this time, the one-way bearing between the sun gear and the motor shaft rotates freely, without adding extra load to the pedal drive. When there is power, the motor speed exceeds the sun gear speed, the one-way bearing rotates forward, and the motor torque and speed are transmitted to the sun gear. At this time, the sun gear is the input, the cage is the output, and the torque and speed are transmitted to the sprocket, and then transmitted to the rear wheel sprocket through the chain, driving the bicycle. At this time, no torque is transmitted to the long shaft, which does not affect the pedal input. The rider can pedal normally, and the bicycle moves, making it convenient and effortless for the rider. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the bicycle assist mechanism according to an embodiment of the present utility model;

[0019] Figure 2 This is a top view of the bicycle assist mechanism provided according to an embodiment of the present utility model;

[0020] Figure 3 yes Figure 2 A cross-sectional view along the AA direction;

[0021] Figure 4 yes Figure 3 A magnified view of a section at point B in the middle;

[0022] Figure 5 This is a structural schematic diagram of the planetary gear mechanism in the bicycle power assist mechanism provided according to an embodiment of the present utility model.

[0023] The reference numerals in the accompanying drawings include: long shaft 1, housing assembly 2, sprocket 3, motor assembly 4, cage 5, ratchet mechanism 6, sun gear 7, planetary gear 8, internal gear ring 9, front housing 10, rear housing 11, middle housing 12, connecting bearing one 13, main frame 14, rear frame 15, front end cover 16, rear end cover 17, connecting bearing two 18, connecting bearing three 19, connecting rod 20, one-way bearing 21, and motor shaft 22. Detailed Implementation

[0024] The following is in conjunction with the appendix Figure 1-5 The present invention will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are only for explaining the present invention and do not constitute a limitation thereof.

[0025] A coaxial planetary gear structure bicycle power assist mechanism, such as Figures 1-3As shown, the bicycle includes a long shaft 1 for connecting the pedals on both sides. A housing assembly 2 is mounted on the long shaft 1. A motor assembly 4 and a planetary gear mechanism are located between the long shaft 1 and the housing assembly 2. The long shaft 1 passes through the housing assembly 2, the motor assembly 4, and the planetary gear mechanism, and the long shaft 1 is coaxially arranged with the housing assembly 2, the motor assembly 4, and the planetary gear mechanism. A sprocket 3 located on the outside of the housing assembly 2 is connected to the long shaft 1. The planetary gear mechanism is located between the motor assembly 4 and the sprocket 3. A front cover 16 and a rear cover 17 are respectively provided at both ends of the housing assembly 2. The rear cover 17 is located between the front cover 16 and the sprocket 3. A connecting bearing 18 is provided between the front cover 16 and the long shaft 1.

[0026] The planetary gear mechanism includes a cage 5, planetary gears 8 mounted on the cage 5, a sun gear 7 meshing with the planetary gears 8, and an internal gear ring 9 connected to the housing assembly 2. The planetary gears 8 mesh with the internal gear ring 9. The cage 5 includes multiple connecting rods 20 evenly distributed circumferentially along the long axis 1, each connecting rod 20 having a planetary gear 8 on it, all of which mesh with the sun gear 7. A ratchet mechanism 6 and a sensor are located within the cage 5 on the long axis 1. The cage 5 is connected to the long axis 1 via the ratchet mechanism 6, and the outer end of the cage 5 extends to the outside of the housing assembly 2 and is connected to a sprocket 3.

[0027] The motor shaft 22 in the motor assembly 4 extends to the inside of the cage 5 and is located on the side of the ratchet mechanism 6 away from the sprocket 3. The motor shaft 22 in the motor assembly 4 is connected to the sun gear 7 through a one-way bearing 21. When the motor assembly 4 is driven, the speed of the motor shaft 22 is greater than the speed of the sun gear 7. At this time, the one-way bearing 21 plays the role of transmitting torque and speed. When the speed of the sun gear 7 is greater than or equal to the speed of the motor assembly 4, the one-way bearing 21 rotates freely and does not transmit any speed or torque.

[0028] The housing assembly 2 includes a front housing 10, a rear housing 11, and a middle housing 12 located between the front housing 10 and the rear housing 11. The outer diameter of the front housing 10 is smaller than the outer diameter of the rear housing 11, the outer diameter of the front cover 16 is smaller than the outer diameter of the rear cover 17, and the outer diameter of the rear cover 17 is smaller than the outer diameter of the sprocket 3. This allows the motor assembly 4 and the planetary gear mechanism to be accommodated while minimizing the space occupied and the volume and weight. The housing assembly 2 can provide protection and fixation.

[0029] The motor assembly 4 is located in the front housing 10. The sun gear 7, one-way bearing 21, planetary gear 8, and internal gear ring 9 are all located in the rear housing 11. The motor shaft 22 of the motor assembly 4 extends into the middle housing 12 and the rear housing 11. A connecting bearing 13 is included between the middle housing 12 and the motor shaft 22. The cage 5 includes a main frame 14 located in the rear housing 11 and a rear frame 15 extending from the end of the main frame 14 near the sprocket 3 into the sprocket 3. The rear frame 15 passes through the rear housing 11 and extends into the sprocket 3. A connecting bearing 3 19 is included between the rear housing 11 and the rear frame 15.

[0030] The planetary gear set mechanism can be a single-stage planetary gear set mechanism, a two-stage planetary gear set mechanism, or a multi-stage planetary gear set mechanism. This embodiment shows a single-stage planetary gear set mechanism, but in actual use, the planetary gear set mechanism is not limited to a single stage. It can be a two-stage or multi-stage planetary gear 8-gear combination mechanism to increase the speed ratio. The specific setting depends on the actual needs.

[0031] A switch is installed on the frame. When the switch is turned on, the motor works; when the switch is not turned on, the motor does not work.

[0032] The implementation method is as follows:

[0033] When there is no motor assistance, the transmission method is as follows: When there is no power, the pedal is pressed and the pedal is connected to the long shaft 1 to start. At this time, the ratchet mechanism 6 rotates forward, transmitting torque to the cage 5, and then to the planetary gears 8 and the sun gear 7. At this time, the cage 5 is the input and the sun gear 7 is the output. The one-way bearing 21 between the sun gear 7 and the motor shaft 22 rotates freely, without adding extra load to the pedal drive. At the same time, the cage 5 also transmits torque and speed to the sprocket 3, and then to the rear wheel sprocket 3 through the chain, driving the rear wheel to work and making the bicycle move.

[0034] When motor assistance is needed, the motor switch is turned on and the foot pedal is pressed. The foot pedal is connected to the long shaft 1 and starts to move. At this time, the ratchet mechanism 6 rotates forward. Simultaneously, the driving information collected by the sensor starts the motor assembly 4. When the speed of the motor assembly 4 exceeds the speed of the sun gear 7, the one-way bearing 21 rotates forward, transmitting the motor torque and speed to the sun gear 7. At this time, the sun gear 7 is the input, and the cage 5 is the output. The cage 5 transmits the torque and speed to the sprocket 3, and then through the chain to the rear wheel sprocket 3, driving the rear wheel to work. At the same time, the ratchet mechanism 6 between the cage 5 and the long shaft 1 rotates in reverse, and no torque is transmitted to the long shaft 1. This does not affect the pedal input, and the person can pedal normally to move the bicycle. When acceleration is needed, the pedal speed can be increased to achieve acceleration.

[0035] Although embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A coaxial planetary row structure bicycle assisting mechanism, characterized by, The system includes a long shaft (1) for connecting the pedals on both sides of the bicycle. A housing assembly (2) is mounted on the long shaft (1). A motor assembly (4) and a planetary gear mechanism are located between the long shaft (1) and the housing assembly (2). The long shaft (1) passes through the housing assembly (2), the motor assembly (4), and the planetary gear mechanism, and is coaxially arranged with the housing assembly (2), the motor assembly (4), and the planetary gear mechanism. A sprocket (3) located outside the housing assembly (2) is connected to the long shaft (1). The planetary gear mechanism is located between the motor assembly (4) and the sprocket (3). The planetary gear mechanism includes a cage (5), planetary gears (8) mounted on the cage (5), and a... The planetary gear (8) meshes with the sun gear (7) and the internal gear ring (9) connected to the housing assembly (2). The planetary gear (8) meshes with the internal gear ring (9). The long shaft (1) is provided with a ratchet mechanism (6) and a sensor located in the cage (5). The cage (5) is connected to the long shaft (1) through the ratchet mechanism (6). The outer end of the cage (5) extends to the outside of the housing assembly (2) and is connected to the sprocket (3). The motor shaft (22) in the motor assembly (4) extends to the inside of the cage (5) and is located on the side of the ratchet mechanism (6) away from the sprocket (3). The motor shaft (22) in the motor assembly (4) is connected to the sun gear (7) through a one-way bearing (21).

2. A coaxial planetary array structure bicycle assist mechanism according to claim 1, characterized in that, The housing assembly (2) includes a front housing (10), a rear housing (11), and a middle housing (12) located between the front housing (10) and the rear housing (11). The motor assembly (4) is located inside the front housing (10), and the motor shaft (22) of the motor assembly (4) extends into the middle housing (12) and the rear housing (11). A connecting bearing (13) is included between the middle housing (12) and the motor shaft (22).

3. A coaxial planetary array structure bicycle assist mechanism according to claim 2, characterised in that, The retainer (5) includes a main frame (14) located within the rear housing (11) and a rear frame (15) extending from one end of the main frame (14) near the sprocket (3) into the sprocket (3); a ratchet mechanism (6) is located between the rear frame and the long shaft.

4. A coaxial planetary array structure bicycle assist mechanism according to claim 3, characterised in that, The sun gear (7), one-way bearing (21), planetary gear (8), and internal gear ring (9) are all located inside the rear housing (11).

5. A coaxial planetary array structure bicycle assist mechanism according to claim 4, characterised in that, The housing assembly (2) has a front cover (16) and a rear cover (17) at its two ends respectively. The rear cover (17) is located between the front cover (16) and the sprocket (3), and a connecting bearing (18) is provided between the front cover (16) and the long shaft (1).

6. A coaxial planetary array structure bicycle assist mechanism according to claim 5, characterised in that, The rear frame (15) passes through the rear housing (11) and extends into the sprocket (3), with a connecting bearing three (19) between the rear housing (11) and the rear frame (15).

7. The coaxial planetary gear structure bicycle power assist mechanism according to claim 6, characterized in that, The cage (5) includes a plurality of connecting rods (20) evenly distributed circumferentially along the long axis (1), and each connecting rod (20) is provided with a planetary gear (8), which meshes with the sun gear (7).

8. The coaxial planetary gear structure bicycle power assist mechanism according to claim 7, characterized in that, The outer diameter of the front housing (10) is smaller than that of the rear housing (11), the outer diameter of the front cover (16) is smaller than that of the rear cover (17), and the outer diameter of the rear cover (17) is smaller than that of the sprocket (3).

9. The coaxial planetary gear structure bicycle power assist mechanism according to claim 1, characterized in that, The planetary gear set mechanism is a single-stage planetary gear set mechanism, a two-stage planetary gear set mechanism, or a multi-stage planetary gear set mechanism.

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