CN217778889U - Planetary wheel set middle motor and power-assisted bicycle - Google Patents

Abstract

The utility model discloses a central motor of a planetary wheel set, which comprises a motor assembly, a pedal shaft, a first transmission assembly and a second transmission assembly; the motor assembly includes a motor shaft parallel to the pedal shaft, a stator and a motor shaft. The rotor is driven and connected; one end of the pedaling shaft is drivingly connected to the power input assembly, and the other end is drivingly connected to the power output assembly; the pedaling shaft is connected to the power output assembly through the one-way device assembly; the motor assembly passes through the first transmission assembly and the second transmission assembly Drive connection; the second transmission assembly is a planetary gear train arranged on the pedal shaft, and the motor assembly drives the second transmission assembly through the first transmission assembly to drive and connect with the power output assembly. The central motor uses an outer rotor motor and a planetary gear mechanism combined with a pedal force input component. This structure has a high output torque; it is small in size and relatively easy to manufacture, greatly reducing manufacturing costs and improving market competitiveness.

Description

A planetary wheel set center motor and power-assisted bicycle

technical field

The utility model relates to a power-assisted bicycle, in particular to a motor in the middle of a planetary wheel set and a power-assisted bicycle.

Background technique

Power-assisted bicycles have the advantages of labor-saving, large load, and fast speed. In recent years, they have become an alternative tool for short-distance travel and transportation.

At present, the motors of most power-assisted bicycles in the market can only provide torque power output to reduce the burden on riders, but they do not have the function of intelligent stepless speed change. The speed change method of power-assisted bicycles is mainly multi-stage through the external transmission. This kind of speed change method In the process of shifting gears, switching chainrings due to the chain will cause frustration, and for users who are not familiar with shifting, improper operation will cause problems such as chain detachment, which will affect the riding experience.

In order to solve the above problems, the patent No.: CN202010176572.0 is an off-axis automatic stepless hybrid transmission system and a power-assisted bicycle. The motor is combined with the wheel hub through a harmonic drive reduction mechanism, and the controller is used to control the motor speed according to the wheel hub speed. However, due to the use of harmonic transmission mechanism, the cost is relatively high, and there is still room for improvement in power output.

Utility model content

In order to overcome the shortcomings of the prior art, the purpose of the utility model is to provide a motor in the center of the planetary gear set to solve the problems pointed out in the background art.

The utility model is realized through the following technical measures, including a motor assembly, a pedal shaft, a first transmission assembly and a second transmission assembly; the motor assembly includes a motor shaft parallel to the pedal shaft, a stator and a The rotor is driven and connected; one end of the pedaling shaft is drivingly connected to a power input assembly, and the other end is drivingly connected to a power output assembly; the pedaling shaft is connected to the power output assembly through a one-way device assembly; the motor assembly is connected to the power output assembly through a first A transmission assembly and a second transmission assembly are drivingly connected; the second transmission assembly is a planetary gear set mechanism arranged on the pedal shaft, and the motor assembly passes through the first transmission assembly and the second transmission assembly in sequence with the PTO drive connection.

As a preferred manner, the first transmission assembly includes a belt, a first pulley drivingly connected to the motor shaft, a second pulley rotationally connected to the pedal shaft, and the second pulley is connected to the second transmission Component driven connections.

As a preferred manner, the belt is a toothed belt, and the first pulley and the second pulley are toothed pulleys.

As a preferred manner, the belt is a toothed belt, and the first pulley and the second pulley are toothed pulleys.

As a preferred manner, the first transmission assembly includes a first gear that is drivingly connected to the motor shaft, a third gear that is rotationally connected to the pedal shaft, and meshes with the first gear and the third gear respectively the second gear.

As a preferred manner, the second transmission assembly includes:

a sun gear, rotatably connected to the pedaling shaft, and drivingly connected to the first transmission assembly;

a planet carrier assembly, rotatably connected to the pedal shaft;

The planetary gear is rotatably connected to the planetary carrier assembly through the planetary gear shaft, and the first-stage planetary gear of the planetary gear meshes with the sun gear;

The internal gear is rotatably connected to the pedal shaft and meshes with the second-stage planetary gear of the planetary gear, and the internal gear is drivingly connected with the power output assembly.

As a preferred method, it includes an output sleeve rotatably connected to the pedal shaft, the internal gear is integrally formed on the output sleeve; the one-way device assembly includes a one-way device lining and a one-way device claw, The lining of the one-way device is arranged on the pedal shaft, and the pawl of the one-way device is fixed on the inner wall of the output sleeve.

As a preferred manner, the power output assembly includes a chain disc.

As a preferred manner, it includes a main casing and a motor casing; the motor assembly is arranged in the motor casing, and the motor casing is connected to the main casing; the first transmission assembly and the second transmission assembly are arranged In the main housing, the pedal shaft is passed through the main housing and protrudes from both ends.

As a preferred manner, it also includes a controller and a detection device; the detection device is electrically connected to the controller, and is used to detect the rotation speed of the pedaling shaft; The rotational speed controls the rotational speed of the motor assembly.

A power-assisted bicycle, which is applied with any one of the above-mentioned planetary gear reduction hub mid-mounted motors.

The utility model provides a planetary wheel set with a central motor and a power-assisted bicycle: the central motor has the function of mixing the speed of the motor speed and the pedaling speed. The actuator assembly drives the output sleeve and the chain plate connected to the end, the chain plate is driven to the hub to rotate, and the controller drives according to the preset speed value (the preset speed value and the pedaling speed maintain a preset ratio) according to the pedaling shaft speed and vehicle speed The motor shaft drives the chain plate to rotate through the first transmission assembly and the planetary gear set mechanism to maintain a dynamic transmission ratio. The ratio is continuous, and the user does not need to shift gears from 0 speed to high speed, and there is no sense of frustration when the mechanical transmission shifts. Achieve a smooth stepless speed change effect and improve the user's riding experience. The central motor uses an outer rotor motor and a planetary gear set mechanism to combine with the pedal force input component. The motor is connected to the sun gear through the toothed pulley set, the pedal crank input is connected to the planet carrier component, and the inner ring gear is connected to the output sleeve or integrally formed. And connected to drive the chain plate, the planetary wheel set combines the speed power of the motor and the speed power of manpower to drive the chain plate to the rear hub. This structure has a high output torque and a fast speed. After mixing with the pedal shaft speed, the maximum can reach 120NTM and 250RPM; A one-way device assembly is set between the shaft and the output sleeve, and the chain disc can be driven smoothly without or with electric auxiliary power; in addition, its small size and relatively easy manufacturing greatly reduce manufacturing costs and improve market competitiveness .

Description of drawings

Fig. 1 is the sectional structure schematic diagram of the utility model embodiment;

Fig. 2 is a schematic structural diagram of the first transmission assembly of the embodiment of the present invention;

Fig. 3 is a schematic structural diagram of a first transmission assembly according to another embodiment of the present invention.

The serial numbers and names marked in the figure: 1. Motor housing 2. Motor housing cover 3. Main housing 4. Main housing cover 5. Rotor 6. Stator 7. Speed magnetic ring 8. Driver 9. First pulley 10. Motor shaft 11. Dust cover 12. First-stage planetary gear 13. Second-stage planetary gear 14. Planetary gear shaft 15. Pillar 16. First bracket 17. Second bracket 18. Retainer 19. Second pulley 20. Sun gear 21. Output Sleeve 22. Internal gear 23. One-way device lining 24. One-way device claw 25. Stepping shaft 26. Chain plate 27. Chain plate nut 28. Belt 29. First bearing 30. Third bearing 31. Fourth Bearing 32. Second bearing 33. Fifth bearing 34. Sixth bearing 35, First gear 36, Second gear 37, Third gear 38. Second gear shaft 39. Crank 100. Motor combination

Detailed ways

Below in conjunction with embodiment and with reference to accompanying drawing, the utility model is described in further detail.

A planetary gear set center motor, with reference to Figure 1, includes a motor assembly, a pedal shaft 25, a first transmission assembly, and a second transmission assembly; the motor assembly includes a motor shaft 10 that is parallel to the pedal shaft 25, and also includes a stator 6 and The rotor 5 drivingly connected with the motor shaft 10; one end of the pedaling shaft 25 is drivingly connected with a power input assembly, and the other end is drivingly connected with a power output assembly; the pedaling shaft 25 is connected with the power output assembly through a one-way device assembly; The transmission assembly is drivingly connected with the second transmission assembly; the second transmission assembly is a planetary gear train arranged on the pedal shaft 25, and the motor assembly drives the second transmission assembly through the first transmission assembly and is drivingly connected with the power output assembly.

Wherein, the power input assembly includes pedaling shaft 25 and crank, which are driven by the rider's pedaling; the power output assembly includes chain disc 26, which is connected with the wheel drive, and the chain disc 26 is provided with a chain and is connected with the wheel hub of the rear wheel; The motor includes a main housing 3, a motor housing 1, a motor housing cover 2, and a main housing cover 4; the motor assembly is arranged in the motor housing 1, and the motor housing 1 is connected to the main housing 3; the first transmission assembly, the second The transmission assembly is set in the main housing 3, the pedal shaft 25 is penetrated in the main housing 3 and protrudes from both ends, and the motor shaft 10 is penetrated in the motor housing 1 and between the motor housing 1 and the motor housing cover 2 A bearing is provided, one end of which protrudes and is connected to the first transmission assembly, and a bearing is provided between the protruding end and the main housing cover 4; the motor housing and the motor housing 1 have a compact assembly structure and a small volume.

It should be understood that the motor assembly in this embodiment includes the inner rotor 5 and the outer stator 6; the principle is based on the prior art and will not be elaborated.

In this embodiment, referring to FIG. 1, the second transmission assembly specifically includes:

The sun gear 20 is rotationally connected with the pedal shaft 25, and is drivenly connected with the first transmission assembly; wherein, the sun gear 20 is fixed on one side of the pulley through screw locking, and the connection position between the sun gear 20 and the inner wall of the first transmission assembly and the pedal shaft Another first bearing is provided between 25; the stepping shaft 25 is provided with a shaft shoulder at the first bearing.

The planetary carrier assembly is driven and connected to the pedaling shaft 25; the planetary carrier assembly specifically includes a ring-shaped fixer 18 set on the pedaling shaft 25, and a key is provided between the fixer 18 and the pedaling shaft 25; it also includes a ring-shaped The first bracket 16 and the second bracket 17, wherein, the first bracket 16 is fixed on one side of the fixture 18; the second bracket 17 is rotatably connected to the outer wall of the tooth seat of the sun gear 20, and a second bearing is arranged between it and the tooth seat 32;

The planetary gear is connected to the planetary carrier assembly through the rotation of the planetary gear shaft 14, and the first-order planetary gear 12 of the planetary gear meshes with the sun gear 20; specifically, the planetary gear shaft 14 is passed through the middle of the planetary gear, and a Bearing; the two ends of the planetary wheel shaft 14 are respectively connected to the first support 16 and the second support 17, and the side opposite to the planetary wheel shaft 14 between the first support 16 and the second support 17 is provided with a pillar 15 to keep the structure stable;

The internal gear 22 is drivingly connected with the pedal shaft 25, and meshes with the second-order planetary gear 13 of the planetary gear; specifically, the internal gear 22 is integrally formed on the output sleeve 21 in this embodiment (in other embodiments, it can also be connected with the output sleeve cylinder 21 drive connection), the output sleeve 21 is rotatably connected to the pedal shaft 25, and the third bearing 30 and the fourth bearing 31 are respectively arranged between the pedal shaft 25; Five bearings 33; a sixth bearing 34 is arranged between the pedal shaft 25 and the main housing cover 4; a chain disc 26 is arranged at one end of the output sleeve 21, and is locked by a chain disc nut 27

The working principle of the central motor: the pedal shaft 25 is driven by the rider to step on the crank to drive the one-way device assembly; when the motor has no power output, the pedaling force drives the chain plate 26 to rotate through the one-way device assembly; When powered, the output sleeve is driven by the motor shaft 10 through the first transmission assembly, the second transmission assembly and pedaling power to rotate at a mixed speed to the drive chain disc 26 .

Further, it also includes a controller and a detection device; the controller is the motor driver 8, and the detection device is electrically connected to the controller for detecting the rotation speed of the pedal shaft 25; The motor driver 8 sends control signals to control the rotation speed of the motor assembly; wherein, the detection device includes a rotation speed magnetic ring 7 , and the rotation speed magnetic ring 7 is respectively arranged on the pedal shaft 25 and the motor shaft 10 .

Based on this, the central motor has a speed mixing function. During its working process, the rider pedals the crank to drive the pedal shaft 25 to rotate when riding without electric power assistance, and the output sleeve 21 drives the chain plate 26 through the one-way device assembly 24 turn;

When the rider is riding with electric power assist, the pedaling crank drives the pedaling shaft 25 to rotate, and the pedaling shaft drives the planet carrier to drive the planetary wheel set to revolve. The rotation speed maintains the preset ratio) to drive the motor shaft 10, drive the sun gear 20 through the first transmission assembly, the sun gear 20 is connected to the planetary gear set and is mixed with the power of the pedal shaft 25 to drive the internal gear 22 and the output sleeve 21 to drive The chain plate 26 rotates to maintain the dynamic transmission ratio. This ratio is continuous. The user does not need to shift gears from 0 speed to high speed, and there is no sense of frustration when the mechanical transmission changes speed. The speed mixed output of the addition of human and human speeds achieves a high-speed and smooth stepless speed change effect, improving the user's riding experience.

In this embodiment, with reference to FIG. 2 , the first transmission assembly includes a belt 28, a first pulley 9 drivingly connected to the motor shaft 10, a second pulley 19 rotatably connected to the pedal shaft 25, and the second pulley 19 is connected to the second transmission Component drive connection; wherein, the belt 28 is preferably a toothed belt 28, and the pulley is preferably a toothed pulley, which has low cost, light weight, small precision requirements, and high transmission efficiency; a first bearing 29;

In other embodiments, referring to FIG. 3 , the first transmission assembly may also include a first gear 35 drivingly connected to the motor shaft 10, a third gear 37 rotatably connected to the pedal shaft 25, and the first gear 35 and the third gear respectively. The second gear 36 meshed with the three gears 37, compared with the belt pulley transmission, uses the gear transmission without dust, and the fatigue life is significantly longer than that of the belt, but the cost is higher, the weight is heavy, the precision requirement is high, and the transmission efficiency is lower than that of the belt.

Based on this, a dustproof cover 11 is provided inside the mid-mounted motor in this embodiment to reduce the influence of dust.

Further, the one-way device assembly includes a one-way device lining 23 and a one-way device claw 24, and the one-way device lining 23 is drivingly connected with the pedal shaft 25, and the one-way device claw 24 is arranged in the output sleeve 21 and the one-way device Between the linings 23, the three are connected in transmission and have a one-way transmission function.

In the non-electric power-assisted mode, the rider pedals the crank to drive the pedal shaft 25, which drives the one-way device lining 23 to rotate and drives the one-way device claw 24 to drive the output sleeve 21 to drive the chain plate 26 and the chain plate nut 27 to rotate synchronously output;

In the speed mixing mode, the output of the motor rotor 5 drives the first pulley to drive the toothed belt 28 to drive the large pulley to rotate, and the sun gear 20 rotates synchronously with the second pulley. At this time, the first-order planetary gear 12, the second-order planetary gear 13, and the sun gear The gear 20 is driven to rotate and mixed with the rotation speed of the planetary wheel frame driven by the pedal shaft. The two speeds are mixed and transmitted to the internal gear 22. The drive output sleeve 21 drives the chain plate 26, the chain plate nut 27, and finally drives the chain. Drive the rear wheel to rotate and travel.

It should be understood that, in the power-assisted power mode, the chain plate 26 is jointly driven to rotate by the motor assembly through each transmission assembly and the rotation speed of the pedal shaft 25. Uncoupling, the output sleeve is not synchronous with the pedal shaft, which is different from the synchronous state without power assistance.

The central motor of this embodiment uses the outer rotor 5 motor and the planetary gear set mechanism to combine with the pedal force input assembly, the motor is connected to the sun gear 20 through the toothed pulley set, the pedal crank input is connected to the planet carrier assembly, the inner ring gear and the output sleeve 21 driving connection or one-piece forming and connecting to drive the chain plate 26, so that the motor speed power and the human speed power are combined to drive the rear hub. The one-way device assembly is arranged between the sleeves 21, and the chain plate 26 can be smoothly driven without electric assistance or with electric auxiliary power; in addition, it is small in size and relatively easy to manufacture, greatly reducing the manufacturing cost and improving market competitiveness.

Install the central motor on the matching bicycle frame, and you can choose whether to add a mechanical transmission device. Because the planetary gear system mixes the power of the pedaling speed and the motor speed, the speed of the bike is much greater than the pedaling speed under control. Under the intelligent control of the controller, the user can realize the comfort and pleasure of easily driving the continuously variable gears of the bicycle.

The above is a description of a planetary wheel set center motor and power-assisted bicycle of the present invention, which is used to help understand the present invention, but the implementation of the present invention is not limited by the above-mentioned embodiments, and any The changes, modifications, substitutions, combinations, and simplifications made under the principle should all be equivalent replacement methods, and all are included in the protection scope of the present utility model.

Claims (9)

1. A planetary gear set mid-mounted motor, characterized in that it includes a motor assembly, a pedal shaft, a first transmission assembly and a second transmission assembly; the motor assembly includes a motor shaft that is parallel to the pedal shaft, and also includes a stator and The rotor is drivingly connected to the motor shaft; the end of the pedaling shaft is drivingly connected to a power input assembly, and the middle part of the pedaling shaft is drivingly connected to a second transmission assembly; one end of the pedaling shaft is connected to a power output assembly; The pedaling shaft is in driving connection with the power output assembly through a one-way device assembly; the motor assembly is drivingly connected through a first transmission assembly and a second transmission assembly; the second transmission assembly is a planetary gear arranged on the pedaling shaft In a wheel set mechanism, the motor assembly is in drive connection with the power output assembly through the first transmission assembly and the second transmission assembly in sequence. 2. A planetary gear mid-mounted motor according to claim 1, characterized in that the first transmission assembly includes a belt, a first pulley that is drivingly connected to the motor shaft, and is rotationally connected to the pedaling shaft. the second pulley, and the second pulley is drivingly connected with the second transmission assembly. 3. A planetary gear set mid-mounted motor according to claim 2, wherein the belt is a toothed belt, and the first pulley and the second pulley are toothed pulleys. 4. A planetary gear mid-mounted motor according to claim 1, wherein the first transmission assembly includes a first gear that is drivingly connected to the motor shaft, a second gear that is rotatably connected to the pedaling shaft Three gears, and a second gear meshing with the first gear and the third gear respectively. 5. The motor in the center of the planetary gear set according to claim 1, wherein the second transmission assembly comprises: a sun gear, which is rotationally connected with the pedaling shaft, and is drivingly connected with the first transmission assembly ; a planet carrier assembly, drivingly connected to the pedal shaft; The planetary gear is rotatably connected to the planetary carrier assembly through the planetary gear shaft, and the first-stage planetary gear of the planetary gear meshes with the sun gear; The internal gear is rotatably connected to the pedal shaft and meshes with the second-stage planetary gear of the planetary gear, and the internal gear is drivingly connected with the power output assembly. 6. A planetary gear mid-mounted motor according to claim 5, wherein the power output assembly includes a chain disc and an output sleeve rotatably connected to the pedal shaft, and the internal gear is driven to connect or integrally formed at one end of the output sleeve; the other end of the output sleeve is drivingly connected to the chain disc; the one-way device assembly includes a one-way device lining and a one-way device claw, The lining is drivingly connected to the pedal shaft, and the one-way pawl is drivingly connected to the inner wall of the output sleeve. 7. A planetary gear mid-mounted motor according to any one of claims 1-6, characterized in that it includes a main housing and a motor housing; the motor assembly is arranged in the motor housing, and the motor housing It is connected with the main housing; the first transmission assembly and the second transmission assembly are arranged in the main housing, and the pedaling shaft is passed through the main housing and protrudes from both ends. 8. A planetary gear mid-mounted motor according to any one of claims 1-6, further comprising a controller and a detection device; the detection device is electrically connected to the controller for detecting the The rotational speed of the pedaling shaft; the controller is used to control the rotational speed of the motor assembly according to the rotational speed of the pedaling shaft fed back by the detection device. 9. A power-assisted bicycle, characterized in that the motor in the planetary wheel set described in any one of claims 1-8 is applied.

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