CN215944807U

CN215944807U - Planet wheel hub motor transmission system and electric moped

Info

Publication number: CN215944807U
Application number: CN202122405470.4U
Authority: CN
Inventors: 许源芳
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-09-30
Filing date: 2021-09-30
Publication date: 2022-03-04
Anticipated expiration: 2031-09-30

Abstract

The utility model discloses a planetary wheel hub motor transmission system, which comprises a hub and a main shaft penetrating through the hub; a motor assembly and a planet wheel speed reducing mechanism are arranged in the hub; the planet gear speed reducing mechanism comprises a sun gear, an inner gear ring, a planet carrier and a planet wheel set; the rotor is in driving connection with the sun gear, and the planetary wheel set comprises a first planetary wheel and a second planetary wheel which synchronously rotates with the first planetary wheel; the first planet wheel is meshed with the sun gear, the second planet wheel is meshed with the inner gear ring, and the inner gear ring is fixedly arranged on the inner wall of the hub; the pedal force input assembly is in driving connection with the planet wheel support. The hub motor transmission system combines an outer rotor motor and a planet wheel speed reducing mechanism with a pedal force input assembly, can achieve a higher multiple speed reducing ratio, and the integral peak torque can reach 3 times of that of the traditional hub motor; compared with a harmonic drive speed reducing mechanism, the production and manufacturing difficulty is reduced, the cost is greatly reduced, and the overall market competitiveness is improved.

Description

Planet wheel hub motor transmission system and electric moped

Technical Field

The utility model relates to a hub motor, in particular to a planetary wheel hub motor transmission system and an electric moped.

Background

With the development of the times and the progress of science and technology, the power-assisted bicycle is also developed rapidly, the power-assisted bicycle is convenient for a user to ride by installing a power-assisted system in the bicycle, the power-assisted bicycle can provide corresponding power support according to the pedaling force of a rider, the riding burden of the rider is lightened, the riding comfort level and the riding mileage are greatly increased, and the power-assisted bicycle is gradually popular in the market.

The moped keeps the original bicycle frame body, limits the volume of a hub motor, causes serious heating in a working state and influences the service life of the motor; simultaneously, moped's variable speed mode mainly is mechanical variable speed, and the sense of setback is suddenly interrupted when shifting, and if misoperation can cause the chain to take off the chain scheduling problem, the influence is ridden and is experienced. In order to solve the above technical problems, patent nos.: CN202020694625.3 discloses an internal rotor hub motor transmission system, which uses a harmonic transmission speed reducing mechanism to combine with a pedal force input component, and is controlled by a controller to realize stepless speed change. But the structure is fine, the production cost of harmonic transmission is higher, the market effect is limited, and a larger progress space exists.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model aims to provide a planetary wheel hub motor transmission system and an electric moped, so that the riding experience of a user is improved, and the production cost is reduced.

The utility model is realized by the following technical measures, comprising a hub and a main shaft penetrating through the hub, wherein the hub is rotationally connected with the main shaft; a motor assembly and a planet wheel speed reducing mechanism are arranged in the hub; the motor assembly comprises a rotor and a stator; the planet gear speed reducing mechanism comprises a sun gear, an inner gear ring, a planet carrier and a planet wheel set; the rotor is in driving connection with the sun gear, and the planetary wheel set comprises a first planetary wheel and a second planetary wheel which rotates synchronously with the first planetary wheel; the first planet gear is meshed with the sun gear, the second planet gear is meshed with the inner gear ring, and the inner gear ring is fixedly arranged on the inner wall of the hub; the pedal force input assembly comprises a pedal force input sleeve which is rotatably connected with the main shaft; the planet carrier comprises a first support, the middle of the first support is rotationally connected with the planetary wheel set, and the pedaling force input sleeve is in driving connection with the first support.

The utility model provides a hub motor transmission system and an electric moped, which have a pedaling input mode, wherein in the pedaling input mode, a rider pedals a pedaling force input assembly, a hub is driven by a pedaling force input sleeve to rotate, meanwhile, a first support connected with the pedaling force input assembly drives a planetary wheel set to rotate simultaneously, and the hub, the planetary wheel set and the pedaling force input sleeve rotate synchronously in the state, so that the electric moped is in a non-power-assisted mode; the bicycle is also provided with a hybrid driving mode (namely, the motor output and manpower treading hybrid driving), in the working process of the bicycle, a rider treading force input assembly drives the hub to rotate through the treading force input sleeve, the controller controls the rotating speed of the motor assembly according to the rotating speed of the treading force input assembly and a preset value, and the driving rotor drives the sun gear and the planetary wheel set to rotate so as to drive the hub fixedly connected with the inner gear ring to rotate; under different rotating speeds of the pedaling force input assembly, the controller is correspondingly provided with different rotating speed values to control the rotating speed of the motor and maintain a dynamic gear ratio, the ratio has continuity, a user starts from a 0-speed to a high-speed without shifting gears, and the jerking feeling generated when the mechanical transmission changes the speed is avoided, so that the stepless speed change effect is achieved, and the riding experience of the user is improved; the hub motor transmission system combines an outer rotor motor and a planet wheel speed reducing mechanism with a pedaling force input assembly, has higher output torque, is matched with a planet wheel train with high speed reducing ratio, has integral peak torque which can reach 3 times of that of the traditional hub motor, and can still smoothly bear and output even if a rider inputs higher pedaling force; meanwhile, compared with a harmonic drive speed reducing mechanism, the hub motor has the advantages that the production and manufacturing difficulty is reduced, the cost is greatly reduced, and the overall market competitiveness is improved.

Drawings

Fig. 1 and 2 are cross-sectional views of embodiments of the present invention.

Number and name in the figure: 1. the device comprises a main shaft 2, a stator support 3, an end cover 4, a hub 5, a stator 6, a magnet 7, a rotor 8, a multi-stage magnetic grid 9, a sun gear 10, a one-way clutch 11, a flywheel clamping machine 12, a second support 13, a first planet wheel 14, a first support 15, an inner gear ring 16, a fluted disc tower base 17, a second planet wheel 18, a pedal force input sleeve 19, a third bearing 20, a second bearing 21, a first bearing 22, a seventh bearing 23, a fourth bearing 24, a fifth bearing 25, a sixth bearing 26, a support 27, a fixing screw 28, an oil seal sheet

Detailed Description

The present invention will be described in further detail with reference to the following examples and drawings.

Example one

A planetary wheel hub motor transmission system, referring to fig. 1, comprises a hub and a spindle penetrating through the hub, wherein the hub is rotatably connected with the spindle and comprises a shell and an end cover connected to one side of the shell; a motor assembly and a planet wheel speed reducing mechanism are arranged in the hub; the motor assembly comprises a rotor and a stator; the planet gear speed reducing mechanism comprises a sun gear, an inner gear ring, a planet carrier and a planet wheel set; the rotor is in driving connection with the sun gear, and the planetary wheel set comprises a first planetary wheel and a second planetary wheel which synchronously rotates with the first planetary wheel; the first planet wheel is meshed with the sun gear, the second planet wheel is meshed with the inner gear ring, and the inner gear ring is fixedly arranged on the inner wall of the hub through a fixing screw; the pedal force input assembly comprises a pedal force input sleeve which is rotationally connected with the main shaft; the planet carrier comprises a first support, the middle of the first support is rotationally connected with the planetary wheel set, and the pedaling force input sleeve is in driving connection with the first support.

The motor preferably uses an outer rotor and an inner stator, and has higher output torque compared with an inner rotor motor; the inner side of the rotor is provided with a magnet and a multi-pole magnetic grid; the basic principle of the planet wheel speed reducing mechanism is the prior art, and the embodiment is not explained; the middle part of the first bracket is provided with a shaft hole, and one end of the planetary wheel set extends outwards to form a columnar structure which is rotationally connected with the shaft hole; the pedal force input assembly further comprises a flywheel clamping machine and a fluted disc tower base, wherein a first-order or multi-order fluted disc can be connected to the fluted disc tower base, and the ratio of the load to the pedal force can be selected in a wider range.

The hub motor transmission system has a pedaling input mode, in the pedaling input mode, the motor has no output, a rider pedals a pedaling force input assembly, a pedaling force input sleeve drives a hub to rotate through a one-way clutch, a first support connected with the hub drives a planetary wheel set to rotate simultaneously, the hub, the planetary wheel set and the pedaling force input sleeve rotate synchronously at the same speed in the state, the planetary wheel set idles in the hub, an inner gear ring is not driven to rotate, a sun gear is not dragged to rotate, and the hub motor transmission system is in a no-power-driven mode, namely the same as an existing no-power-driven vehicle.

Furthermore, the transmission system of the planet wheel hub motor also comprises a controller and a detection device; the detection device is electrically connected with the controller and is used for detecting the rotating speed of the pedaling force input assembly; the controller is used for controlling the rotating speed of the motor component according to the rotating speed of the pedal force input component fed back by the detection device.

Based on the structure, the hub motor transmission system also has a hybrid driving mode (namely, motor output and manpower treading hybrid driving), in the working process, a rider treading force input assembly drives the hub to rotate through the treading force input sleeve, the controller controls the rotating speed of the motor assembly according to the rotating speed of the treading force input assembly and a preset value, and the driving rotor drives the sun gear and the planetary gear set to rotate so as to drive the hub fixedly connected with the inner gear ring to rotate; under the different rotational speeds of the pedaling force input assembly, the controller is correspondingly provided with different rotational speed values to control the rotational speed of the motor, the dynamic gear ratio is maintained, the ratio has continuity, a user starts from a 0-speed to a high speed without shifting gears, and the stepless speed change effect is achieved without the pause and the frustration generated when the mechanical transmission changes the speed, so that the riding experience of the user is improved.

The hub motor transmission system of the embodiment combines an outer rotor motor and a planet wheel speed reducing mechanism with a pedaling force input assembly, has higher output torque, can achieve 12-16 times of gear reduction ratio, has integral peak torque which can achieve 3 times of that of the traditional hub motor, and can still smoothly bear output even if a rider inputs higher pedaling force; meanwhile, compared with the hub motor with the harmonic drive speed reducing mechanism, the hub motor has the advantages that the production and manufacturing difficulty is reduced, the structure is simple and compact, the size is small, the cost is greatly reduced, and the riding experience and the overall market competitiveness of a user are improved.

Furthermore, a one-way clutch and a seventh bearing are arranged between the pedal force input sleeve and the hub, and the pedal force input sleeve can be normally used in the case of electric drive or no electric drive; it should be noted that, in other embodiments, the position of the one-way clutch may also be changed to be set between the ring gear and the hub and between the main shaft and the sun gear, so that the motor assembly is not dragged to rotate without electric power driving, and the labor load is reduced.

It can be understood that, in the hybrid driving mode, the second planet gear drives the inner gear ring at the rotation speed (rotor rotation speed + gear reduction ratio + pedaling rotation speed), at this time, the rotation speed of the hub is higher than the pedaling speed, and the one-way clutch slides away from the driving connection with the pedaling force input sleeve.

Furthermore, the planet carrier also comprises a second bracket, and the first bracket and the second bracket can limit two ends of the planetary wheel set; the second bracket is rotatably connected to the main shaft or the outer wall of the sun gear, preferably to the outer wall of the sun gear in the embodiment, so that the structure is compact; the second bracket is provided with a planet wheel shaft which is used for being rotationally connected with the planet wheel set; the middle part of the first planet wheel is provided with a shaft hole, and the planet wheel shaft is rotationally connected with the shaft hole, so that the structure is compact.

Specifically, three groups of struts which are uniformly distributed with the planet wheel shaft are arranged on the second bracket, only one group is shown in the figure, and the other two groups of struts are arranged at two ends of the main shaft in the horizontal direction; one end of the strut is connected to the second support, the side wall of the other end of the support is fixedly connected with the pedal force input sleeve, the other end of the support is fixedly connected with the pedal force input sleeve through a connecting piece, and the rotating rigidity and stability of the planetary wheel set are kept through the strut.

In an embodiment, referring to fig. 1, the motor assembly further includes a stator bracket for fixing the inner stator, the stator bracket is fixedly connected with the main shaft through a key, and one end of the sun gear extends into the inner side of the inner stator, so that the structure is compact, and the space in the hub is fully utilized.

In an embodiment, referring to fig. 1, the outer surface of the end cap is provided with heat dissipation fins, which are fin-shaped protrusions integrally formed on the surface of the hub cover, so as to increase the contact area between the hub cover and the air, improve the heat dissipation effect of the hub motor, and improve the service life of the hub motor.

It should be noted that, a cylindrical structure is formed on the surface of the stator support in a protruding manner, the end cover is rotationally connected to the cylindrical structure, the structure is compact, meanwhile, the end cover is matched with the stator support in shape, the inner wall of the end cover is close to the stator support, and heat-conducting grease is arranged between the end cover and the stator support, so that the heat-conducting effect is improved; meanwhile, the stator support is provided with an oil sealing sheet to prevent grease from leaking outwards.

It can be understood that a first bearing is arranged between the end cover and the stator bracket; two second bearings are arranged between the sun gear and the main shaft, and a spacing sleeve is arranged between the two second bearings; a third bearing is arranged between the second support and the sun gear, and a fourth bearing is arranged between the first planet wheel and the planet wheel shaft; a fifth bearing is arranged between the second planet wheel and the shaft hole of the first support; a sixth bearing is arranged between the pedal force input sleeve and the main shaft; in addition, the main shaft is provided with shaft shoulders, and the wheel hub and all parts are provided with limiting structures under the condition of ensuring the installation condition.

Example two

An electric moped applies the planetary wheel hub motor transmission system of the first embodiment, the hub motor transmission system is combined with a pedaling force input assembly by using an outer rotor motor and a planetary wheel speed reducing mechanism, the electric moped has higher output torque and can reach 12-16 times of gear speed reducing ratio, the integral peak torque can reach 3 times of that of a traditional hub motor, and even if a rider inputs higher pedaling force, the hub motor can still smoothly bear output; meanwhile, compared with a harmonic drive speed reducing mechanism, the hub motor has the advantages that the production and manufacturing difficulty is reduced, the cost is greatly reduced, and the overall market competitiveness is improved.

The above description is provided for the planetary wheel hub motor transmission system and the electric bicycle, and is used to help understanding the present invention, but the embodiments of the present invention are not limited by the above embodiments, and any changes, modifications, substitutions, combinations, and simplifications that do not depart from the principle of the present invention should be replaced by equivalents, and all are included in the scope of the present invention.

Claims

1. A planetary wheel hub motor transmission system is characterized by comprising a hub and a main shaft penetrating through the hub, wherein the hub is rotationally connected with the main shaft; a motor assembly and a planet wheel speed reducing mechanism are arranged in the hub; the motor assembly comprises a rotor and a stator; the planet gear speed reducing mechanism comprises a sun gear, an inner gear ring, a planet carrier and a planet wheel set; the rotor is in driving connection with the sun gear, and the planetary wheel set comprises a first planetary wheel and a second planetary wheel which rotates synchronously with the first planetary wheel; the first planet gear is meshed with the sun gear, the second planet gear is meshed with the inner gear ring, and the inner gear ring is fixedly arranged on the inner wall of the hub; the pedal force input assembly comprises a pedal force input sleeve which is rotatably connected with the main shaft; the planet carrier comprises a first support, the middle of the first support is rotationally connected with the planetary wheel set, and the pedaling force input sleeve is in driving connection with the first support.

2. The planetary-wheel-hub motor transmission system of claim 1, wherein a one-way clutch and a bearing are provided between the pedaling force input sleeve and the hub.

3. The planetary wheel hub motor transmission system of claim 1, further comprising a controller and a detection device; the detection device is electrically connected with the controller and is used for detecting the rotating speed of the pedaling force input assembly; the controller is used for controlling the rotating speed of the motor component according to the rotating speed of the pedal force input component fed back by the detection device.

4. The planetary-wheel-hub-motor transmission system according to claim 1, wherein the planet carrier further comprises a second carrier, the second carrier is rotatably connected to the outer wall of the main shaft or the sun gear, and the second carrier is provided with a planetary wheel shaft for rotatably connecting with the planetary wheel set.

5. The planetary wheel hub motor transmission system of claim 4, wherein the second carrier is provided with a pillar disposed opposite to the planetary wheel shaft, one end of the pillar is connected to the second carrier, and the other end of the pillar is fixedly connected to the pedaling force input sleeve.

6. The planetary-wheel-hub-motor transmission system of claim 1, wherein the hub comprises a housing and an end cap attached to one side of the housing.

7. The planetary-wheel-hub motor transmission system as claimed in claim 6, wherein the motor assembly comprises an outer rotor, an inner stator and a stator support for fixing the inner stator, the stator support is fixedly connected with the main shaft, and one end of the sun gear extends into the inner side of the inner stator.

8. The planetary-wheel-hub motor transmission system of claim 6, wherein the outer surface of the end cover is provided with heat dissipating fins.

9. The planetary-wheel-hub motor transmission system of claim 7, wherein the surface of the stator support is protruded to form a cylindrical structure, and the end cover is rotatably connected to the cylindrical structure.

10. An electric bicycle, characterized in that, the planet wheel hub motor transmission system of any claim 1-9 is applied.