CN217918284U

CN217918284U - Power device of moped and moped

Info

Publication number: CN217918284U
Application number: CN202222447144.4U
Authority: CN
Inventors: 鲜跃于
Original assignee: Weizman Power Suzhou Co ltd
Current assignee: Weizman Power Suzhou Co ltd
Priority date: 2022-09-15
Filing date: 2022-09-15
Publication date: 2022-11-29
Anticipated expiration: 2032-09-15

Abstract

The utility model discloses a power device of a power-assisted bicycle and the power-assisted bicycle, wherein the power device comprises a motor body part, a speed reduction part and an output unit; the speed reduction part is a planetary speed reduction mechanism which is provided with a plurality of planet wheels, and each planet wheel is arranged on a planet carrier through a connecting unit; the relative rotation center between the planet wheel and the connecting unit and the relative rotation center between the connecting unit and the planet carrier are both parallel. The utility model discloses a power assisting bicycle's power device and power assisting bicycle is through installing planet wheel eccentric centre on the planet carrier for power device during operation, but the position of joint unit self-adaptation rotation regulation planet wheel, in order to reduce the influence that machining error and assembly error brought to a certain extent, avoid the obvious inequality of pressure that the planet wheel bore, realize the comparatively even reposition of redundant personnel of transmission power, promote power device's life-span.

Description

Power device of moped and moped

Technical Field

The utility model relates to a power bicycle technical field especially relates to a power bicycle's power device and moped.

Background

The bicycle is a common tool for daily travel replacement, has the characteristics of convenience and quickness, has no trouble of traffic jam, and is suitable for short-distance travel. Along with the technical progress, the electric power-assisted bicycle is also more and more popular, and the power device of the electric power-assisted bicycle relates to a motor and a speed reducer, wherein the speed reducer is generally a planetary gear speed reducer which has the characteristics of small volume and large speed reduction ratio. Current planetary gear speed reducer, its form is comparatively fixed, generally include a plurality of planet wheels, every planet wheel meshes with sun gear and outer ring gear simultaneously, the planet wheel rotates and installs on the planet carrier, because the machining error of planet carrier and the assembly error between planet wheel and the planet carrier, the meshing situation between different planet wheels and sun gear and the outer ring gear is different, this kind of condition can lead to driven power can not average shunt for each planet wheel, the transmission pressure of individual planet wheel can show and be greater than other planet wheels, can wear and tear sooner, can cause the abnormal sound scheduling problem for a long time, also can reduce the life-span of speed reducer. In order to solve the problem, the current main means is to improve the machining precision and the assembling precision, which inevitably causes the great increase of the cost.

Disclosure of Invention

The purpose of the invention is as follows: in order to overcome the deficiencies in the prior art, the utility model provides a can avoid planetary wheel load inequality, and with low costs power device and moped of moped.

The technical scheme is as follows: in order to achieve the above object, the power device of the power-assisted bicycle of the present invention comprises a motor body portion, a speed reduction portion and an output unit; the speed reduction part is arranged between the motor body part and the output unit; the speed reduction part comprises a sun gear, a planet carrier and an outer gear ring, the sun gear is driven by the motor body part to rotate, and the planet carrier is in driving connection with the output unit; the number of the planet wheels is multiple, and each planet wheel is meshed with the sun wheel and the outer gear ring simultaneously;

each planet wheel is arranged on the planet carrier through a connecting unit; the relative rotation center between the planet wheel and the connecting unit and the relative rotation center between the connecting unit and the planet carrier are parallel.

Further, the connecting unit comprises a middle part and two shaft ends which are arranged at two sides of the middle part, namely a first shaft end and a second shaft end; the first and second axial ends are concentrically disposed, and the intermediate portion is eccentrically disposed with respect to the two axial ends; the planet wheel is rotatably arranged on the middle part; the first shaft end is rotationally connected with the planet carrier; the second shaft end is rotatably connected with the retainer.

Further, both of the shaft ends are thinner than the intermediate portion.

Further, a needle bearing is arranged between the planet wheel and the middle part.

Further, the planet carrier is disc-shaped.

Further, the motor body part and the speed reduction part are installed in the same housing.

Furthermore, the power device is a middle motor arranged in the middle of the power-assisted bicycle; the output unit is used for being connected with a pedal crank of the power-assisted bicycle.

Further, the power device is an in-wheel motor.

A power-assisted bicycle comprises the power device.

Has the advantages that: the utility model discloses a moped's power device and moped, through with planet wheel eccentric mounting on the planet carrier for when power device operates, but the position of joint unit self-adaptation rotation regulation planet wheel, with reduce the influence that machining error and assembly error brought to a certain extent, avoid the obvious inequality of pressure that the planet wheel bore, realize the comparatively even reposition of redundant personnel of transmission power, promote power device's life-span.

Drawings

FIG. 1 is a block diagram of a power unit of a power-assisted bicycle in an embodiment;

FIG. 2 is a structural view of a decelerating portion;

fig. 3 is an exploded view of the deceleration section;

FIG. 4 is a structural view of a connection unit;

fig. 5 is a structural view of a power unit of a power-assisted bicycle in another embodiment.

In the figure: 1-a motor body part; 11-a stator; 12-a rotor; 2-a deceleration section; 21-sun gear; 22-planets; 23-a planet carrier; 24-an outer gear ring; 25-a linking unit; 251-an intermediate portion; 252-a first shaft end; 253-second axial end; 26-needle bearings; 27-a cage; 28-a bearing; 29-gear set; 3-an output unit; 4-shell.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

The power unit of the bicycle with assist as shown in fig. 1 includes a motor body portion 1, a speed reduction portion 2, and an output unit 3.

The motor body portion 1 includes a stator 11 and a rotor 12.

As shown in fig. 2 to 3, the speed reduction part 2 is interposed between the motor body part 1 and the output unit 3; the speed reduction part 2 comprises a sun gear 21, a planet gear 22, a planet carrier 23 and an external gear ring 24, the sun gear 21 is driven by the motor body part 1 to rotate, and the planet carrier 23 is in driving connection with the output unit 3; the number of the planet gears 22 is multiple, and each planet gear 22 is meshed with the sun gear 21 and the outer gear ring 24 simultaneously; each planet wheel 22 is mounted on the planet carrier 23 through a connecting unit 25; the relative rotation centers between the planetary gear 22 and the connecting unit 25 and the relative rotation centers between the connecting unit 25 and the planetary carrier 23 are both parallel, i.e., the two rotation centers are not coincident.

Specifically, as shown in fig. 4, the connecting unit 25 includes a middle portion 251 and two shaft ends disposed at two sides of the middle portion 251, namely a first shaft end 252 and a second shaft end 253; the first shaft end 252 and the second shaft end 253 are concentrically arranged, and the middle portion 251 is eccentrically arranged relative to the two shaft ends; the planet wheels 22 are rotatably mounted on the intermediate portion 251; the first shaft end 252 is rotationally connected with the planet carrier 23; the second shaft end 253 is rotatably connected to the holder 27.

In order to ensure the smooth rotation of the planet gears 22, needle bearings 26 are provided between the planet gears 22 and the intermediate portion 251.

The motor body part 1 and the speed reduction part 2 may have their own housings and then be assembled together (i.e., a separate mounting structure), but preferably, the motor body part 1 and the speed reduction part 2 are mounted in the same housing 4, so that the overall compactness of the power device can be improved and the volume can be reduced.

In addition, the planet carrier 23 and the retainer 27 are both disc-shaped, and the disc-shaped planet carrier 23 and the retainer 27 have the characteristics of large inertia and smooth running, and are suitable for being used in a power device of a bicycle. Preferably, the planet carrier 23 and the retainer 27 are sleeved with bearings 28, and both are mounted in the housing 4 through the bearings 28.

In one embodiment, as shown in fig. 1, the power device is a central motor installed in the middle of the power-assisted bicycle, and the planet carrier 23 transmits power to the output unit 3 through a gear set 29, and the output unit 3 is used for connecting a pedal crank of the power-assisted bicycle.

In another embodiment, as shown in fig. 5, the power unit is a hub motor, which is mounted in the center of the bicycle drive wheel, or the outer side of the housing 4 of which is formed with a hub and mounted with a tire.

The invention also provides a power-assisted bicycle which comprises the power device.

The above description is only a preferred embodiment of the present invention, and it should be noted that: for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present invention.

Claims

1. A power device of a power-assisted bicycle comprises a motor body part (1), a speed reduction part (2) and an output unit (3); the speed reduction part (2) is arranged between the motor body part (1) and the output unit (3); the speed reduction part (2) comprises a sun gear (21), a planet gear (22), a planet carrier (23) and an outer gear ring (24), the sun gear (21) is driven to rotate by the motor body part (1), and the planet carrier (23) is in driving connection with the output unit (3); the number of the planet wheels (22) is multiple, and each planet wheel (22) is meshed with the sun wheel (21) and the outer gear ring (24) simultaneously; the method is characterized in that:

each planet wheel (22) is mounted on the planet carrier (23) by a connecting unit (25); the relative rotation center between the planet wheel (22) and the connecting unit (25) and the relative rotation center between the connecting unit (25) and the planet carrier (23) are parallel.

2. The power unit of a bicycle with an assist as set forth in claim 1, characterized in that the connecting unit (25) comprises a middle portion (251) and two shaft ends disposed on both sides of the middle portion (251), a first shaft end (252) and a second shaft end (253), respectively; said first axial end (252) and said second axial end (253) being concentrically disposed, said intermediate portion (251) being eccentrically disposed relative to both of said axial ends; the planet wheel (22) is rotatably mounted on the intermediate part (251); the first shaft end (252) is rotationally connected with the planet carrier (23); the second shaft end (253) is rotatably connected with the retainer (27).

3. A power unit for a bicycle according to claim 2, characterized in that both of said axial ends are thinner than said intermediate portion (251).

4. A power unit for a bicycle according to claim 2, characterised in that a needle bearing (26) is arranged between the planet wheel (22) and the intermediate part (251).

5. A power unit for a bicycle with assistance according to claim 1, characterised in that the planet carrier (23) is disc-shaped.

6. The power unit of a power-assisted bicycle according to claim 1, characterized in that the motor body part (1) and the reduction part (2) are mounted in the same housing (4).

7. The power unit of the power-assisted bicycle according to claim 1, wherein the power unit is a centrally-mounted motor mounted in the middle of the power-assisted bicycle; the output unit (3) is used for being connected with a pedal crank of the moped.

8. The power unit of a power-assisted bicycle according to claim 7, wherein the power unit is a hub motor.

9. A power assisted bicycle, characterized in that it comprises a power unit according to any one of claims 1 to 8.