TWM468598U - Harmonic decelerator for electric bicycle driver - Google Patents

Description

Harmonic reducer for electric bicycle drive

This creation is related to a speed reducer, especially a speed reducer that operates on the principle of harmonics.

In terms of its driving motor, electric bicycles are classified into three categories: high-speed motors, medium-speed motors and low-speed motors. The higher the rated motor speed, the smaller the volume, the lighter the weight, the higher the efficiency, and the higher the cost. Low, but the general electric bicycle is running at low speed. If high-speed motor is used, the speed reducer is needed. The reduction ratio, volume, efficiency and cost of the reducer are one of the decisive factors for the performance and price of the bicycle driver. At present, most electric bicycles are directly driven by low-speed motors, and do not require a mechanical reduction mechanism. The technical content is low, the efficiency is low, the cost is high, the volume is large, and the weight is heavy. In recent years, electric bicycles have adopted a large number of medium-speed motors, and the planetary gears have been decelerated, and the performance has been improved. However, at present, the electric bicycles at home and abroad have not yet adopted high-speed motors, and the large reduction ratio reducers are used as electric bicycle drivers, which limits the development of electric bicycles.

Generally, the electric bicycle driver is a driving motor provided on the bicycle driving shaft. When the driver is placed in the middle, the driving motor drives the bicycle through the sprocket, and the driver can also be front or rear, thereby driving the front wheel or the rear wheel to rotate. Usually the drive motor is decelerated by a harmonic reducer to meet the cycling requirements of the bicycle. The general harmonic reducer mainly includes a harmonic generator, a flexible wheel shaft, a harmonic flexible wheel and a harmonic wheel set in the casing, and the rotor of the driving motor is coaxial with the harmonic generator, the soft wheel shaft, the harmonic soft wheel and the harmonic wheel. Setting, one end of the harmonic generator is connected to the rotor of the driving motor, and the harmonics are soft. One end of the wheel is sleeved to the outer ring of the harmonic generator through the bearing, and the inner ring of one end of the flexible wheel shaft is disposed at the other end of the harmonic generator through the bearing, and the outer ring of the shaft end of the flexible wheel shaft is disposed on the inner ring of the harmonic soft wheel shaft diameter section, the harmonic flexible wheel shaft The diameter section directly drives the bicycle as the output shaft of the reducer. After actual use, after a certain number of kilometers of bicycle riding, the shaft diameter section of the harmonic flex wheel breaks, resulting in the failure of the reducer, reducing the service life of the reducer, and there are certain safety hazards. The reason is mainly due to the stress concentration of the harmonic soft wheel shaft section and the material fatigue. Therefore, the structure of the conventional harmonic reducer has certain defects.

The technical problem to be solved by this creation is the harmonic reducer of the electric bicycle driver. The harmonic reducer overcomes the defects of the conventional harmonic reducer, avoids the breakage of the harmonic soft wheel shaft diameter section, and improves the service life of the reducer. It ensures the safety of cycling.

In order to solve the above technical problems, the present invention provides a harmonic reducer for an electric bicycle driver, comprising a housing, a harmonic generator, a flexible wheel sleeve, a harmonic flexible wheel and a harmonic wheel, the harmonic generator, and the soft The axle sleeve and the harmonic flex wheel are sequentially sleeved and located in the casing, and one end of the harmonic flex wheel is disposed on the outer ring of the harmonic generator through a bearing, and the harmonic wheel is fixedly disposed on the inner ring of the casing And an inner ring of one end of the harmonic wheel, the inner ring of one end of the flexible wheel sleeve is disposed on one outer ring of the harmonic generator through a bearing, and the other end of the flexible wheel sleeve is disposed on the axis of the harmonic flexible wheel The inner ring of the segment, the harmonic reducer further includes a power output shaft, the output shaft sleeve is sleeved on the outer ring of the shaft of the harmonic flexible wheel shaft, and one end end surface is fixedly connected to the end face of the harmonic flexible wheel through a pin shaft and a screw. The outer ring of the force shaft is connected to the inner ring of the casing through a bearing, and the outer ring of the other end of the output shaft is connected to the inner ring of the open end of the casing through a bearing.

Further, the bearing between the output shaft outer ring and the inner ring of the housing is an angular contact ball bearing.

Further, the bearing between the outer end outer ring of the output shaft and the inner ring of the open end of the housing is a deep groove ball bearing.

Since the harmonic reducer of the electric bicycle driver of the present invention adopts the above technical solution, the harmonic reducer includes a housing, a harmonic generator, a flexible wheel sleeve, a harmonic flexible wheel and a harmonic wheel, and harmonic generation occurs. The flexible wheel bushing and the harmonic soft wheel are sequentially sleeved and located in the casing, and one end of the harmonic flexible wheel is disposed on the outer ring of the harmonic generator through the bearing, and the harmonic rigid wheel is fixedly disposed on the inner ring of the casing and located at one end of the harmonic flexible wheel. The outer ring, the inner ring of one end of the flexible wheel bushing is arranged on the outer ring of one end of the harmonic generator through the bearing, and the other end of the flexible wheel bushing is arranged on the inner ring of the harmonic soft wheel shaft diameter section. The harmonic reducer also includes the output shaft and the output shaft sleeve. It is arranged on the outer ring of the harmonic soft wheel shaft diameter section and one end end face is fixedly connected with the end face of the harmonic flexible wheel through the pin shaft and the screw. The outer ring of the output shaft is connected to the inner ring of the casing through the bearing, and the outer ring of the output end of the output shaft is connected to the open end of the casing through the bearing. Inner ring. The harmonic reducer of the present invention utilizes the output shaft sleeve to be disposed on the harmonic flexible wheel shaft diameter section, thereby overcoming the defect of the conventional harmonic reducer, that is, the excessive strain caused by the repeated stress of the harmonic flexible wheel shaft diameter section causes the material to be caused. Fatigue and breakage, through the structural reinforcement of the output shaft, the strain of the harmonic soft wheel shaft diameter can be reduced, thereby delaying or even avoiding material fatigue, thereby avoiding the breakage of the harmonic flexible wheel shaft diameter section and improving the The service life of the reducer ensures the safety of the bicycle.

1‧‧‧shell

2‧‧‧harmonic generator

3‧‧‧Harmonic soft wheel

31‧‧‧ shaft diameter section

4‧‧‧Harmonic wheel

5‧‧‧Flexible bushings

6‧‧‧Output shaft

7‧‧‧First bearing

8‧‧‧second bearing

9‧‧‧ screws

10‧‧‧ pin

11‧‧‧ Third bearing

12‧‧‧fourth bearing

Fig. 1 is a schematic structural view of a harmonic reducer of the electric bicycle driver of the present invention.

As shown in FIG. 1 , the harmonic reducer of the present electric bicycle driver comprises a housing 1 , a harmonic generator 2 , a flex wheel sleeve 5 , a harmonic flex wheel 3 and a harmonic wheel 4 , the harmonic generator 2. The flexible wheel sleeve 5 and the harmonic flexible wheel 3 are sequentially sleeved and located in the housing 1, and the harmonic flexible wheel 3 is disposed on the outer ring of the harmonic generator 2 through the first bearing 7, and the harmonic One end of the flexible wheel 3 is a shaft diameter segment 31, and the harmonic wheel 4 is fixedly disposed on the inner ring of the casing 1, and the harmonic wheel is located on the harmonic flex wheel 3 with respect to the shaft diameter segment. The outer ring of the other end of the 31 meshes, usually in the form of a gear. An inner ring of one end of the flexible wheel sleeve 5 is disposed on one outer ring of the harmonic generator 2 through a second bearing 8, and the other end of the flexible wheel sleeve 5 is disposed on the inner circumference of the shaft diameter section 31 of the harmonic flexible wheel 3 . The harmonic reducer of the present invention further includes a power output shaft 6 which is sleeved on the outer ring of the shaft diameter section 31 of the harmonic flex wheel 3 and has one end end surface fixedly connected to the harmonic through the pin shaft 10 and the screw 9. Further, the output shaft 6 is tightly coupled to the shaft diameter section 31, and the outer ring of the output shaft 6 is connected to the inner ring of the casing 1 through a third bearing 11, and the other end of the output shaft 6 The outer ring is connected to the inner end of the open end of the casing 1 via a fourth bearing 12.

Further, the third bearing 11 between the outer ring of the output shaft 6 and the inner ring of the casing 1 is an angular contact ball bearing.

Further, the fourth bearing 12 between the outer end ring of the output shaft 6 and the inner ring of the open end of the casing 1 is a deep groove ball bearing.

The harmonic reducer overcomes the breakage of the shaft diameter section of the harmonic reducer of the conventional harmonic reducer by increasing the output shaft, avoiding the stress concentration and material fatigue of the harmonic soft wheel shaft diameter section; the driving motor drives the rotating force through the rotor Passed to the harmonic generator, the harmonic generator and the harmonic wheel transmit the rotational force to the harmonic soft wheel and play a deceleration role. The flexible wheel sleeve acts as a support and transition harmonic soft wheel, and the harmonic soft wheel The outer diameter of the shaft diameter section is provided with the output shaft, and the connecting end faces of the two are further fixedly connected by a uniform screw and a pin shaft. Preferably, the two are closely combined to make the harmonic flexible wheel and the output shaft Forming the whole, between the output shaft and the inner ring of the casing and the inner ring of the open end of the casing The bearings are respectively arranged to improve the reliability of the output shaft rotation, and the output shaft drives the bicycle through the sprocket, the front wheel shaft or the rear wheel shaft of the bicycle to achieve the purpose of driving the bicycle. The harmonic reducer of the present invention replaces the harmonic soft wheel shaft diameter segment by the output shaft as the driving shaft of the bicycle, and overcomes the defect that the harmonic soft wheel of the conventional technology is directly driven by the shaft diameter segment and is easy to have stress concentration and material fatigue. It can be seen that the harmonic soft wheel of the creation using the output shaft effectively avoids the breakage of the harmonic soft wheel shaft diameter section, improves the service life of the harmonic reducer, and ensures the safety of riding the electric bicycle.

Embodiment 1 is a harmonic reducer for an electric bicycle driver, comprising: a harmonic generator; a harmonic flexible wheel disposed on the harmonic generator, wherein one end of the harmonic flexible wheel is a shaft diameter segment; a harmonic wheel is sleeved outside the harmonic flex wheel, and the harmonic flex wheel is meshed with the harmonic wheel with respect to the other end of the shaft diameter segment; and a power output shaft is fixed to the shaft diameter segment .

The second embodiment is the harmonic reducer of the first embodiment, wherein a first bearing is further disposed between the harmonic generator and the harmonic flex wheel.

The third embodiment is the harmonic reducer according to the first embodiment, wherein the harmonic flex wheel is pivotally connected to one end of the harmonic generator through a flexible wheel bushing.

The fourth embodiment is the harmonic reducer of the third embodiment, wherein the flexible wheel sleeve and the harmonic flexible wheel are fixed to each other, and the flexible wheel sleeve is transmitted through a second bearing and the end of the harmonic generator Pick up.

The fifth embodiment, the harmonic reducer of the first embodiment, further comprising a casing disposed outside the harmonic flex wheel and the harmonic wheel, and the output shaft is transmitted through a third bearing and a The fourth bearing is pivotally connected to the housing.

The sixth embodiment, the harmonic reducer of embodiment 5, wherein the third bearing It is an angular contact ball bearing.

The seventh embodiment is the harmonic reducer of embodiment 5, wherein the fourth bearing is a deep groove ball bearing.

Embodiment 8 The harmonic reducer of Embodiment 5, wherein the third bearing is disposed between the inner ring of the housing and the outer ring of the output shaft.

The ninth embodiment is the harmonic reducer of embodiment 5, wherein the fourth bearing is disposed between the inner end of the open end of the housing and the output shaft.

Embodiment 10: A harmonic reducer for an electric bicycle driver, comprising a housing, a harmonic generator, a flexible wheel sleeve, a harmonic flexible wheel and a harmonic wheel, the harmonic generator, the flexible wheel sleeve and the harmonic flexible wheel Squeezing and nesting in the casing, one end of the harmonic flex wheel is disposed on the outer ring of the harmonic generator through a bearing, and the harmonic wheel is fixedly disposed on the inner ring of the casing and located at the harmonic An inner ring of one end of the flexible wheel sleeve, an inner ring of one end of the flexible wheel sleeve is disposed on an outer ring of one end of the harmonic generator through a bearing, and the other end of the flexible wheel sleeve is disposed on an inner ring of the shaft of the harmonic flexible wheel shaft, and the characteristic thereof The present invention is characterized in that: the harmonic reducer further includes a power output shaft, the output shaft sleeve is sleeved on the outer ring of the harmonic flexible wheel shaft diameter section, and one end end surface is fixedly connected to the harmonic flexible wheel end surface through a pin shaft and a screw, and the output force is The outer ring of the shaft is connected to the inner ring of the casing through a bearing, and the outer ring of the other end of the output shaft is connected to the inner ring of the open end of the casing through a bearing.

1‧‧‧shell

2‧‧‧harmonic generator

3‧‧‧Harmonic soft wheel

31‧‧‧ shaft diameter section

4‧‧‧Harmonic wheel

5‧‧‧Flexible bushings

6‧‧‧Output shaft

7‧‧‧First bearing

8‧‧‧second bearing

9‧‧‧ screws

10‧‧‧ pin

11‧‧‧ Third bearing

12‧‧‧fourth bearing

Claims (3)

A harmonic reducer for an electric bicycle driver, comprising a casing, a harmonic generator, a flexible wheel sleeve, a harmonic flexible wheel and a harmonic wheel, wherein the harmonic generator, the flexible wheel sleeve and the harmonic flexible wheel are sequentially sleeved and Located in the casing, one end of the harmonic flex wheel is disposed on the outer ring of the harmonic generator through a bearing, and the harmonic wheel is fixedly disposed on the inner ring of the casing and located outside one end of the harmonic flex wheel a ring, an inner ring of one end of the flexible wheel sleeve is disposed on an outer ring of one end of the harmonic generator through a bearing, and the other end of the flexible wheel sleeve is disposed on an inner ring of the shaft of the harmonic flexible wheel, characterized in that: the harmonic The wave reducer further includes a power output shaft, the power output shaft sleeve is sleeved on the outer ring of the harmonic flexible wheel shaft diameter section, and one end end surface is fixedly connected to the harmonic flexible wheel end surface through a pin shaft and a screw, and the output shaft outer ring passes The bearing is connected to the inner ring of the casing, and the outer ring of the other end of the output shaft is connected to the inner ring of the open end of the casing through a bearing. The harmonic reducer for an electric bicycle drive according to claim 1, wherein the bearing between the output shaft outer ring and the inner ring of the housing is an angular contact ball bearing. The harmonic reducer for an electric bicycle driver according to claim 1, wherein the bearing between the outer end of the output shaft and the inner ring of the open end of the housing is a deep groove ball bearing.