CN220857821U

CN220857821U - Middle motor and electric bicycle

Info

Publication number: CN220857821U
Application number: CN202322611992.9U
Authority: CN
Inventors: 黄洪岳; 臧曙光; 余传鑫
Original assignee: Aneida Drive Technology Shanghai Co ltd
Current assignee: Aneida Drive Technology Shanghai Co ltd
Priority date: 2023-09-25
Filing date: 2023-09-25
Publication date: 2024-04-26
Anticipated expiration: 2033-09-25

Abstract

The utility model provides a centrally-mounted motor and an electric bicycle, which comprise: the clutch comprises a driving unit, a speed reducer unit, a clutch structure and a mounting shell; the driving unit includes: a stator assembly and a rotor assembly; the rotor assembly is rotatably mounted on the stator assembly; the speed reducer unit includes: gear, worm and worm wheel; the rotor assembly is meshed with the gear, one end of the worm is fixedly connected with the gear, and the other end of the worm is meshed with the worm wheel; the worm gear is connected with the clutch structure, and the driving unit, the speed reducer unit and the clutch structure are installed in the installation shell. The worm, worm wheel, gear and other structural designs of the speed reducer unit are compact, the transmission ratio is larger, high torque output can be realized, the impact load of the design mode is small, the transmission is stable, the noise is low, the noise reduction performance is good, and meanwhile, the space utilization rate is high, so that the size can be smaller, and the installation application range is wide.

Description

Middle motor and electric bicycle

Technical Field

The utility model relates to the field of electric bicycles, in particular to a centrally-mounted motor and an electric bicycle.

Background

The electric bicycle is convenient to travel, is a necessary transportation means for many families, and the central motor is an important part for exerting the power assisting function of the electric bicycle. The use and layout of the transmission mechanism of the middle motor not only determine the use performance of the motor; difficulty in assembly and manufacture; a range of use installation occasions; but also affects the riding effect of the electric bicycle.

At present, the existing centrally-mounted motor has many internal parts, low space utilization rate and low motor reduction ratio in a limited space, and is inconvenient for miniaturization design.

Disclosure of utility model

Aiming at the defects in the prior art, the utility model aims to provide a centrally-mounted motor and an electric bicycle.

The centrally-mounted motor provided by the utility model comprises: the device comprises a driving unit, a speed reducer unit, a worm gear output shaft, a worm gear one-way clutch, a middle shaft clutch, a clutch sleeve and a torque sensor;

The output end of the driving unit is connected with the speed reducer unit, the output end of the speed reducer unit is connected with the worm gear output shaft through the one-way clutch of the worm gear one-way clutch, the one-way clutch connection means that the worm gear can drive the worm gear output shaft to rotate, and the worm gear output shaft can not drive the worm gear to rotate in turn, so that the driving device is in the prior art;

The worm gear output shaft is provided with the center shaft clutch, the torque sensor is connected with the clutch sleeve, the clutch sleeve is connected with the center shaft clutch in a clutch mode, and the clutch connection meets the connection state that the clutch sleeve and the center shaft clutch rotate together and the separation state that the clutch sleeve and the center shaft clutch do not interfere with each other.

Preferably, the decelerator unit includes: gear, worm and worm wheel;

One end of the worm is fixedly connected with the gear, and the other end of the worm is meshed with the worm wheel.

Preferably, the driving unit includes: a stator assembly and a rotor assembly;

The rotor assembly is rotatably mounted on the stator assembly, the rotor assembly being in meshing engagement with the gear.

Preferably, the worm wheel is connected with the worm wheel output shaft through the worm wheel one-way clutch;

and a worm bearing is arranged between the worm wheel and the worm wheel output shaft, and the worm wheel bearing is arranged at two ends of the worm wheel one-way clutch and limited by a clutch clamp spring.

Preferably, a middle shaft supporting bearing is arranged in the shaft hole of the worm gear output shaft, and a middle shaft of the moment sensor is rotatably arranged in the shaft hole of the worm gear output shaft and is matched with the middle shaft supporting bearing.

Preferably, the middle shaft clutch is limited by a clutch clamp spring, and the clutch sleeve is connected with the torque sensor by a spline.

Preferably, the middle shaft support bearing is limited by a bearing snap spring.

Preferably, the driving unit is installed in a stator bracket, and an end cover is installed on the stator bracket;

The end cover is connected with the box body, the box body is provided with a box body end cover, and the speed reducer unit, the worm gear output shaft, the worm gear one-way clutch, the center shaft clutch, the clutch sleeve and the torque sensor are arranged in a bearing chamber formed by the box body and the box body end cover.

Preferably, worm bearings are arranged at two ends of the worm.

Compared with the prior art, the utility model has the following beneficial effects:

1. The worm, worm wheel, gear and other structural designs of the speed reducer unit are compact, have larger transmission ratio, can realize high torque output, and the design mode has the advantages of small impact load, stable transmission, low noise and good noise reduction performance, and meanwhile, the space utilization rate of the speed reducer unit is high, so that the size can be smaller, and the application range of installation is wide;

2. When a rider stops stepping, the pedal can be prevented from rotating by the foot through the design of the middle shaft clutch, and when the electric bicycle does not start a power assisting function, the force can not be transmitted to the driving unit through the worm wheel one-way clutch, so that the motor driving unit is protected, and meanwhile, the resistance in the riding process is reduced;

3. According to the application, through directly designing both clutches on the worm gear output shaft, the shape precision control during actual production is facilitated.

Drawings

Other features, objects and advantages of the present utility model will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:

FIG. 1 is an exploded view of a center motor;

FIG. 2 is a schematic diagram of the structure of the drive unit and the decelerator unit;

Fig. 3 is a schematic view of the internal structure of the case;

the figure shows:

Detailed Description

The present utility model will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present utility model, but are not intended to limit the utility model in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present utility model.

Example 1

As shown in fig. 1, the present embodiment includes: stator frame 1, stator assembly 2, rotor assembly 3, end cover 4, box end cover 5, box 6, gear 7, worm 8, worm wheel 10, worm wheel output shaft 11, worm wheel one-way clutch 14, worm wheel bearing 15, clutch jump ring 16, middle axis clutch 17, clutch cover 18 and torque sensor 19.

As shown in fig. 3, the rotor assembly 3 is rotatably mounted on the stator assembly 2, the rotor assembly 3 is meshed with the gear 7, one end of the worm 8 is fixedly connected with the gear 7, the other end is meshed with the worm wheel 10, the worm wheel output shaft 11 is connected with the worm wheel 10 through the one-way clutch 14, a worm wheel bearing 15 is arranged between the worm wheel 10 and the worm wheel output shaft 11, and the worm wheel bearing 15 is arranged at two ends of the worm wheel one-way clutch 14 and limited through a clutch clamp spring 16.

The worm gear output shaft 11 is provided with a middle shaft clutch 17, a clutch sleeve 18 is connected with the middle shaft clutch 17 in a clutch mode, and a torque sensor 19 is connected with the clutch sleeve 18. The middle shaft clutch 17 is limited by a clutch clamp spring 16, and a clutch sleeve 18 is connected with a torque sensor 19 by a spline. A middle shaft supporting bearing 12 is arranged in a shaft hole of the worm gear output shaft 11, and the middle shaft supporting bearing 12 is limited by a bearing clamp spring 13. The center shaft of the torque sensor 19 is rotatably installed in the shaft hole of the worm gear output shaft 11 and is matched with the center shaft support bearing 12.

As shown in fig. 2, an end cover 4 is mounted on the stator support 1 and forms a first bearing chamber with the end cover 4, a box 6 is connected with the end cover 4, and a box end cover 5 is mounted on the box 6 and forms a second bearing chamber with the box end cover 5. The stator assembly 2 and the rotor assembly 3 are arranged in the first bearing chamber, one end of the rotor assembly 3 penetrates through the end cover 4 and then extends to the second bearing chamber to be meshed with the gear 7 in the second bearing chamber, the worm 8, the worm wheel 10 and the clutch structure are arranged in the second bearing chamber, worm bearings 9 are arranged at two ends of the worm 8, and the worm bearings 9 play a role of axial limiting.

Working principle: when a rider starts to tread, the middle motor starts to start the power-assisted motor, the motor drives the gear shaft of the rotor assembly 3 to output, the gear shaft of the rotor assembly 3 and the gear 7 are in meshed transmission to drive the coaxial worm 8 to rotate, the worm 8 and the worm wheel 10 are in meshed transmission, the worm wheel 10 drives the worm wheel output shaft 11 to rotate through the worm wheel one-way clutch 14 to finish the output of torque, the clutch sleeve 18 and the middle shaft clutch 17 are in a connection state, and the torque output of the worm wheel output shaft 11 provides power assistance for the rider through the clutch sleeve 18 and the torque sensor 19.

When the rider stops stepping on, the torque sensor 19 transmits a stepping frequency damping signal to the controller (the controller is in the prior art), the controller adjusts the clutch sleeve 18 and the center shaft clutch 17 to a separated state, and when the rider stops stepping on, the driving unit still works, the clutch sleeve 18 is not output by the torque of the worm gear output shaft 11, and the rider cannot follow the motor.

When the electric bicycle does not have the power assisting function, a rider steps on the pedal-driven bicycle, and the pedal force is transmitted to the worm gear output shaft 11 through the torque sensor 19, the clutch sleeve 18 and the center shaft clutch 17 in sequence so as to drive the bicycle; when the stepping force is transmitted to the worm wheel output shaft 11, the worm wheel output shaft 11 does not transmit the force to the driving unit by the one-way clutch action of the worm wheel one-way clutch 14.

Example 2

Example 2 is a preferred example of example 1.

As shown in fig. 1, the present embodiment includes: stator support 1, stator assembly 2, rotor assembly 3, end cover 4, box end cover 5, box 6, gear 7, worm 8, worm bearing 9, worm wheel 10, worm wheel output shaft 11, axis support bearing 12, bearing jump ring 13, worm wheel one-way clutch 14, worm wheel bearing 15, clutch jump ring 16, axis clutch 17, clutch sleeve 18, torque sensor 19.

As shown in fig. 2, the stator assembly 2 is press-mounted on the stator support 1, the stator core is limited by the processing end face of the stator support 1, the rotor assembly 3 is in running fit with the stator assembly 2, the bearing at one end of the rotor assembly 3 is mounted in the first bearing chamber of the stator support 1, the bearing at the other end of the rotor assembly is matched with the end cover 4, and meanwhile, the stator support 1 and the end cover 4 are connected through screws to form a closed driving unit.

The worm 8 is meshed with the worm wheel 10, a worm bearing 9 is arranged on the worm 8, the gear 7 is pressed on the worm bearing 9 at one end and is connected with the worm 8 into a whole, and then the whole is arranged in the bearing chamber of the box body 6. The gear shaft of the rotor assembly 3 is meshed with the gear 7 pressed on the worm 8, and the end cover 4 is fastened and connected with the box body 6 and the box body end cover 5 by bolts to form a complete middle-set motor.

As shown in fig. 3, the worm wheel 10, the worm wheel one-way clutch 14 and the worm wheel bearing 15 are sequentially pressed into a whole and then sleeved on the worm wheel output shaft 11, and the clutch clamp spring 16 is arranged in a clamp spring groove of the worm wheel output shaft 11 to limit the clamp spring.

The middle shaft clutch 17 is pressed on the worm gear output shaft 11 and limited by the clutch clamp spring 16, and the clutch sleeve 18 is matched with the torque sensor 19 through spline connection; a middle shaft supporting bearing 12 is pressed in the shaft hole of the worm gear output shaft 11, a torque sensor 19 connected with a clutch sleeve 18 is arranged in the shaft hole of the worm gear output shaft 11, and the middle shaft of the torque sensor 19 is in running fit with the worm gear output shaft 11 through the middle shaft supporting bearing 12; a worm gear output shaft 11 and a torque sensor 19 which are connected into a whole and are arranged on the box body 6; after the box body end cover 5 and the worm gear output shaft 11 are matched, the box body 6 and the box body end cover 5 are connected into a whole through bolts.

The central motor is started, the motor driving unit works, torque is transmitted through a speed reducer unit consisting of a gear 7, a worm wheel 10 and a worm 8, and torque is output through a worm wheel output shaft 11.

Specifically, when a rider starts to tread, the middle motor starts to start the power-assisted motor, the motor is driven to be output by the gear shaft of the rotor assembly 3, and the gear shaft of the rotor assembly 3 is meshed with the gear 7 to carry out transmission; the coaxial worm 8 is driven to rotate, and the worm 8 and the worm wheel 10 are meshed for transmission; the worm wheel 10 drives the worm wheel output shaft 11 to rotate through the worm wheel one-way clutch 14, and torque output is completed.

When the rider stops stepping on, the torque sensor 19 transmits a pedal frequency damping signal to the controller, and the controller adjusts the connection state of the clutch sleeve 18 and the center shaft clutch 17, so that when the rider stops stepping on, the motor still rotates, the foot of the rider is not caused to rotate along with the motor.

When the electric bicycle does not have the power-assisting function, a rider steps on the pedal-driven bicycle, and the pedal force is transmitted to the worm gear output shaft 11 through the torque sensor 19, the clutch sleeve 18 and the middle shaft clutch 17 so as to drive the bicycle; when the stepping force is transmitted to the worm wheel output shaft 11, the worm wheel output shaft 11 does not transmit the force to the rotor assembly 3 due to the one-way clutch function of the worm wheel one-way clutch 14, thereby protecting the motor drive unit and reducing the resistance during riding.

In the description of the present application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.

The foregoing describes specific embodiments of the present utility model. It is to be understood that the utility model is not limited to the particular embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without affecting the spirit of the utility model. The embodiments of the utility model and the features of the embodiments may be combined with each other arbitrarily without conflict.

Claims

1. A center motor, comprising: the clutch comprises a driving unit, a speed reducer unit, a clutch structure and a mounting shell;

The driving unit includes: a stator assembly (2) and a rotor assembly (3);

The rotor assembly (3) is rotatably mounted on the stator assembly (2);

The speed reducer unit includes: a gear (7), a worm (8) and a worm wheel (10);

The rotor assembly (3) is meshed with the gear (7), one end of the worm (8) is fixedly connected with the gear (7), and the other end of the worm is meshed with the worm wheel (10);

the worm wheel (10) is connected with the clutch structure, and the driving unit, the speed reducer unit and the clutch structure are installed in the installation shell.

2. The center motor of claim 1, wherein the clutch structure comprises: a worm gear output shaft (11), a worm gear one-way clutch (14), a center shaft clutch (17), a clutch sleeve (18) and a torque sensor (19);

The worm gear output shaft (11) is connected with the worm gear (10) through the one-way clutch of the worm gear one-way clutch (14), the middle shaft clutch (17) is arranged on the worm gear output shaft (11), the clutch sleeve (18) is connected with the middle shaft clutch (17) in a clutch mode, and the torque sensor (19) is connected with the clutch sleeve (18).

3. The center motor of claim 1, wherein the mounting housing comprises: the stator comprises a stator bracket (1), an end cover (4), a box body end cover (5) and a box body (6);

The stator support (1) is provided with the end cover (4) and surrounds the end cover (4) to form a first bearing chamber, the box body (6) is connected with the end cover (4), and the box body (6) is provided with the box body end cover (5) and surrounds the box body end cover (5) to form a second bearing chamber.

4. A mid-motor as claimed in claim 3, wherein: the stator assembly (2) and the rotor assembly (3) are installed in the first bearing chamber, one end of the rotor assembly (3) penetrates through the end cover (4) and then extends to the second bearing chamber to be meshed with a gear (7) in the second bearing chamber, and the worm (8), the worm wheel (10) and the clutch structure are all arranged in the second bearing chamber.

5. A mid-motor as claimed in claim 2, wherein: a worm bearing (15) is arranged between the worm wheel (10) and the worm wheel output shaft (11), and the worm wheel bearing (15) is arranged at two ends of the worm wheel one-way clutch (14) and limited by a clutch clamp spring (16).

6. A mid-motor as claimed in claim 2, wherein: a middle shaft supporting bearing (12) is arranged in a shaft hole of the worm gear output shaft (11), and a middle shaft of the moment sensor (19) is rotatably arranged in the shaft hole of the worm gear output shaft (11) and matched with the middle shaft supporting bearing (12).

7. A mid-motor as claimed in claim 2, wherein: the middle shaft clutch (17) is limited by a clutch clamp spring (16), and the clutch sleeve (18) is connected with the torque sensor (19) through a spline.

8. The center motor according to claim 6, wherein: the middle shaft supporting bearing (12) is limited through a bearing clamp spring (13).

9. A mid-motor as claimed in claim 2, wherein: two ends of the worm (8) are provided with worm bearings (9).

10. An electric bicycle is characterized in that: use of a mid-motor according to any one of claims 1-9.