Wheel-side electric drive system

Abstract

The utility model belongs to vehicle drive system technical field, more specific say to a kind of wheel edge electric drive system, including motor casing and speed reducer casing, disc-shaped motor stator, disc-shaped motor rotor and motor main shaft are set in the motor casing, the motor main shaft is connected with motor rotor, fixed gear ring is provided on the inner wall of the speed reducer casing, output shaft is rotatably connected on the speed reducer casing, planetary support is provided on the output shaft, planetary gear is rotatably connected on the planetary support, the planetary gear is engaged with fixed gear ring, the output end of motor main shaft is inserted into speed reducer casing, and the sun gear provided on output end, the planetary gear is engaged with sun gear, hub is provided on the output shaft, sprocket is provided on the output shaft, this drive system mechanism is compact, power transmission path is shorter, and efficiency is better.

Description

Technical Field

[0001] This utility model belongs to the technical field of vehicle drive systems, and more specifically relates to a wheel-side electric drive system. Background Technology

[0002] In the field of motorcycle electric drive, commonly used structural forms include hub motors, wheel-side motors, and mid-drive motors. While hub motors are simple in structure, they are heavy, have high rotational inertia, and low efficiency, affecting overall vehicle handling and increasing material costs. Mid-drive motors have longer transmission paths and occupy limited battery space, reducing the vehicle's range. Traditional wheel-side motors with reducers suffer from large axial dimensions and weight, impacting overall vehicle performance. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides a wheel-side electric drive system that integrates an axial flux motor and a planetary reducer. This drive system has a compact structure, a shorter power transmission path, and better efficiency.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a wheel-side electric drive system, comprising a motor housing and a reducer housing. The motor housing contains a disc-shaped motor stator, a disc-shaped motor rotor, and a motor main shaft. The motor main shaft is connected to the motor rotor. A fixed gear ring is provided on the inner wall of the reducer housing. An output shaft is rotatably connected to the reducer housing. A planetary support is provided on the output shaft. Planetary gears are rotatably connected to the planetary support. The planetary gears mesh with the fixed gear ring. The output end of the motor main shaft extends into the reducer housing, and a central gear is provided on the output end. The planetary gears mesh with the central gear. A hub and a sprocket are provided on the output shaft.

[0005] Furthermore, a control cavity is provided at the end of the motor housing, and a sensor stator and a sensor rotor are provided in the control cavity. The sensor rotor is connected to the end of the motor main shaft. When the sensor rotor rotates, the sensor stator senses and collects the rotation angle signal of the sensor rotor.

[0006] Furthermore, a number of first bearings are provided between the motor spindle and the motor housing.

[0007] Furthermore, a front cover for the motor is provided between the motor housing and the reducer housing, the output end of the motor spindle passes through the front cover for the motor, and a first oil seal is provided between the motor spindle and the front cover for the motor.

[0008] Furthermore, a second bearing is provided between the output shaft and the reducer housing.

[0009] Furthermore, the output shaft is threadedly connected to the hub, and bushings are provided on the output shaft at both ends of the hub. One of the bushings is located between the reducer housing and the output shaft, and a second oil seal is provided between the bushing and the reducer housing.

[0010] Furthermore, the reducer housing is connected to the vehicle bracket.

[0011] Compared with the prior art, the beneficial effects of this utility model are: by adopting a planetary reducer structure, the output end of the motor main shaft is not subjected to radial force, and the rotor of the disc motor is subjected to unidirectional magnetic pull from the stator of the disc motor, which greatly reduces the axial dimension. This power assembly is more compact, has a shorter power transmission path, and is more efficient. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the wheel-side electric drive system of this utility model.

[0013] Reference numerals: 1. Motor housing; 2. Reducer housing; 3. Motor stator; 4. Motor rotor; 5. Motor main shaft; 6. Fixed gear ring; 7. Output shaft; 8. Planetary support; 9. Planetary gear; 10. Central gear; 11. Hub; 12. Control cavity; 13. Sensor stator; 14. Sensor rotor; 15. Motor front cover; 16. First oil seal; 17. Bushing; 18. Second oil seal; 19. First bearing; 20. Second bearing. Detailed Implementation

[0014] In the description of this utility model, it should be noted that the directional terms such as "center", "horizontal (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this utility model.

[0015] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature. In the description of this utility model, "several" or "a number" means two or more, unless otherwise explicitly specified.

[0016] Reference Figure 1 The present invention will be further described below.

[0017] A wheel-side electric drive system includes a motor housing 1 and a reducer housing 2. The motor housing 1 houses a disc-shaped motor stator 3, a disc-shaped motor rotor 4, and a motor main shaft 5. The motor main shaft 5 is connected to the motor rotor 4. A fixed gear ring 6 is provided on the inner wall of the reducer housing 2. An output shaft 7 is rotatably connected to the reducer housing 2. A planetary support 8 is provided on the output shaft 7, and a planetary gear 9 is rotatably connected to the planetary support 8. The planetary gear 9 meshes with the fixed gear ring 6. The output end of the motor main shaft 5 extends into the reducer housing 2, and a central gear 10 is provided on the output end. The planetary gear 9 meshes with the central gear 10. A hub 11 and a sprocket are provided on the output shaft 7.

[0018] like Figure 1 As shown, the above-mentioned electric drive system adopts a planetary reducer structure. The output end of the motor spindle 5 is not subjected to radial force. In addition, the rotor 4 of the disc motor is subjected to the unidirectional magnetic pull of the disc motor stator 3, which greatly reduces the axial dimension.

[0019] like Figure 1 As shown, specifically, the disc-shaped motor stator 3 is fixedly connected to the motor housing 1 by a number of screws.

[0020] like Figure 1 As shown in this example, preferably, the motor housing 1 has a control cavity 12 at its end. The control cavity 12 has a sensor stator 13 and a sensor rotor 14. The sensor rotor 14 is connected to the end of the motor main shaft 5. When the sensor rotor 14 rotates, the sensor stator 13 senses and collects the rotation angle signal of the sensor rotor 14.

[0021] like Figure 1 As shown in this example, preferably, a plurality of first bearings 19 are provided between the motor spindle 5 and the motor housing 1, and the first bearings 19 are all located on the side of the motor rotor 4 facing the end of the motor spindle 5, which further saves the space inside the motor housing 1 and makes the overall drive system more compact.

[0022] like Figure 1 As shown in this example, preferably, a motor front cover 15 is provided between the motor housing 1 and the reducer housing 2, the output end of the motor main shaft 5 passes through the motor front cover 15, and a first oil seal 16 is provided between the motor main shaft 5 and the motor front cover 15 to prevent the lubricating oil in the reducer housing 2 from flowing into the motor housing 1.

[0023] like Figure 1 As shown in this example, preferably, a second bearing 20 is provided between the output shaft 7 and the reducer housing 2.

[0024] like Figure 1As shown, in this preferred embodiment, the output shaft 7 is threadedly connected to the hub 11, and bushings 17 are provided on the output shaft 7 located at both ends of the hub 11. One of the bushings 17 is located between the reducer housing 2 and the output shaft 7. A second oil seal 18 is provided between the bushing 17 and the reducer housing 2 to prevent the lubricating oil in the reducer housing 2 from leaking outward.

[0025] In this example, preferably, the reducer housing 2 is connected to the vehicle bracket.

[0026] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A wheel-side electric drive system, characterized in that: The device includes a motor housing and a reducer housing. The motor housing contains a disc-shaped motor stator, a disc-shaped motor rotor, and a motor spindle. The motor spindle is connected to the motor rotor. A fixed gear ring is mounted on the inner wall of the reducer housing. An output shaft is rotatably connected to the reducer housing. A planetary support is mounted on the output shaft, and planetary gears are rotatably connected to the planetary support. The planetary gears mesh with the fixed gear ring. The output end of the motor spindle extends into the reducer housing and has a central gear mounted on it. The planetary gears mesh with the central gear. A hub and a sprocket are mounted on the output shaft.

2. The wheel-side electric drive system according to claim 1, characterized in that: A control cavity is provided at the end of the motor housing. A sensor stator and a sensor rotor are provided in the control cavity. The sensor rotor is connected to the end of the motor main shaft. When the sensor rotor rotates, the sensor stator senses and collects the rotation angle signal of the sensor rotor.

3. The wheel-side electric drive system according to claim 1, characterized in that: Several first bearings are provided between the motor spindle and the motor housing.

4. The wheel-side electric drive system according to claim 1, characterized in that: A front cover for the motor is provided between the motor housing and the reducer housing. The output end of the motor spindle passes through the front cover for the motor. A first oil seal is provided between the motor spindle and the front cover for the motor.

5. The wheel-side electric drive system according to claim 1, characterized in that: A second bearing is provided between the output shaft and the reducer housing.

6. The wheel-side electric drive system according to claim 1, characterized in that: The output shaft is threadedly connected to the hub, and bushings are provided on the output shaft at both ends of the hub. One of the bushings is located between the reducer housing and the output shaft, and a second oil seal is provided between the bushing and the reducer housing.

7. The wheel-side electric drive system according to claim 1, characterized in that: The reducer housing is connected to the vehicle bracket.

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