EP-4737235-A1 - SIDE-MOUNTED ELECTROMECHANICAL BRAKING DEVICE AND VEHICLE

EP4737235A1EP 4737235 A1EP4737235 A1EP 4737235A1EP-4737235-A1

Abstract

This application provides a side-mounted electro-mechanical braking apparatus and a vehicle. The electro-mechanical braking system includes a brake motor, a reducer, and a control circuit board. The control circuit board is configured to fasten a control circuit of the brake motor. The control circuit of the brake motor is configured to output an alternating current to drive the brake motor. The brake motor is configured to be in transmission connection to a brake by using the reducer. The brake is configured to brake wheels of the vehicle. The reducer includes an input shaft and an output shaft that are arranged in parallel. The input shaft is configured to be in transmission connection to a motor shaft of the brake motor. The output shaft is configured to drive the brake. In an axial direction of the brake motor, the input shaft is arranged between the motor shaft of the brake motor and the control circuit board, and the input shaft and the output shaft are arranged on a side that is of the control circuit board and that faces the brake motor. A thickness direction of the control circuit board is parallel to an axial direction of the input shaft, and a length direction of the control circuit board is parallel to an arrangement direction of the input shaft and the output shaft. The electro-mechanical braking apparatus in this application is characterized by a small volume and high transmission efficiency.

Inventors

MAO, Yan
ZHU, Lingfeng
SUN, YI
YAN, Keyu

Assignees

Huawei Digital Power Technologies Co., Ltd.

Dates

Publication Date: 20260506
Application Date: 20230713

Claims (15)

A side-mounted electro-mechanical braking apparatus, wherein the electro-mechanical braking apparatus comprises a brake motor, a reducer, and a control circuit board, the control circuit board is configured to fasten a control circuit of the brake motor, the control circuit of the brake motor is configured to output an alternating current to drive the brake motor, the reducer comprises an input shaft and an output shaft that are arranged in parallel, the input shaft is configured to be in transmission connection to a motor shaft of the brake motor, and the output shaft is configured to drive a brake, wherein in an axial direction of the brake motor, the input shaft is arranged between the motor shaft of the brake motor and the control circuit board, and the input shaft and the output shaft are arranged on a side that is of the control circuit board and that faces the brake motor; and a thickness direction of the control circuit board is parallel to an axial direction of the input shaft, and a length direction of the control circuit board is parallel to an arrangement direction of the input shaft and the output shaft.
The electro-mechanical braking apparatus according to claim 1, wherein the electro-mechanical braking apparatus comprises a position sensor, the position sensor is configured to detect a rotation angle of the brake motor, the position sensor comprises a stator and a rotor, the control circuit board is configured to fasten the stator, and the input shaft is configured to be in coaxial transmission connection to the motor shaft and the rotor.
The electro-mechanical braking apparatus according to claim 1 or 2, wherein a gear set of the reducer comprises a motor gear and an output gear, the motor gear is coaxially fastened to the input shaft, the motor gear is in transmission connection to the output gear , the output gear is configured to drive the output shaft to rotate, and the motor gear and the output gear are arranged on a side that is of the control circuit board and that faces the brake motor.
The electro-mechanical braking apparatus according to claim 3, wherein the gear set of the reducer comprises a planetary input gear wheel, a planetary gear train, and a planetary output gear, the motor gear is configured to be in transmission connection to the planetary input gear , the planetary input gear is in transmission connection to the planetary output gear through the planetary gear train, and the planetary output gear is used as the output gear of the reducer to drive the output shaft to rotate, or is configured to drive the output shaft to rotate, wherein the motor gear and the planetary input gear are spaced apart in the arrangement direction of the input shaft and the output shaft, and the planetary gear train is arranged between the planetary input gear and the planetary output gear in an axial direction of the output shaft.
The electro-mechanical braking apparatus according to any one of claims 1 to 4, wherein the electro-mechanical braking apparatus comprises a housing, the housing comprises a reducer accommodating cavity and a control circuit accommodating cavity, the reducer accommodating cavity is provided to accommodate the gear set of the reducer, the control circuit accommodating cavity is provided to accommodate the control circuit board, the housing comprises a separator plate and a cover plate, the control circuit board is arranged between the separator plate and the cover plate in the axial direction of the brake motor, and the separator plate is configured to separate the reducer accommodating cavity from the control circuit accommodating cavity.
The electro-mechanical braking apparatus according to claim 5, wherein at least one of the separator plate or the cover plate is configured to fasten the control circuit board, and the input shaft is configured to penetrate the separator plate and be in transmission connection to the rotor of the position sensor and the motor shaft of the brake motor.
The electro-mechanical braking apparatus according to any one of claims 1 to 6, wherein the motor shaft of the brake motor and the input shaft of the reducer are of an integrated structure, and the brake motor comprises a proximal shaft bearing and a distal shaft bearing, wherein in the axial direction of the brake motor, the proximal shaft bearing and the distal shaft bearing are arranged on two sides of a motor rotor of the brake motor, and the distal shaft bearing and the control circuit board are arranged on two sides of the proximal shaft bearing.
The electro-mechanical braking apparatus according to any one of claims 1 to 7, wherein the electro-mechanical braking apparatus comprises the brake, the brake is configured to brake wheels of a vehicle, the brake comprises a reversing mechanism and at least one friction lining, the reversing mechanism and the motor shaft of the brake motor are arranged in parallel in the arrangement direction of the input shaft and the output shaft, and the reversing mechanism and the at least one friction lining are arranged on a side that is of the control circuit board and that faces the brake motor, wherein the reversing mechanism is configured to rotate with the output shaft and drive the friction lining to move in the axial direction of the output shaft, and the friction lining is configured to brake the wheels of the vehicle.
The electro-mechanical braking apparatus according to claim 8, wherein the reversing mechanism comprises a leadscrew and a ballscrew jacket, and the leadscrew and the motor shaft of the brake motor are arranged in parallel in the arrangement direction of the input shaft and the output shaft, wherein the leadscrew is configured to be in transmission connection to the output shaft and drive the ballscrew jacket to move in an axial direction of the leadscrew; and the ballscrew jacket is configured to drive the at least one friction lining to move in the axial direction of the brake motor.
The electro-mechanical braking apparatus according to claim 4, wherein the electro-mechanical braking apparatus comprises a lock actuator, the lock actuator is configured to lock or release a rotation action of the output gear , the lock actuator comprises a clutch and a lock motor, the lock motor is configured to control the clutch to perform locking or releasing, the control circuit board is configured to fasten a control circuit of the lock motor, and the control circuit of the lock motor is configured to output an alternating current to drive the lock motor, wherein the lock motor is arranged between the control circuit board and the output gear in an axial direction of the lock motor.
The electro-mechanical braking apparatus according to claim 10, wherein the lock actuator comprises an axial moving member, and the lock motor is configured to drive the axial moving member to move away from or move toward the clutch to control the clutch to perform locking or releasing.
The electro-mechanical braking apparatus according to claim 11, wherein the clutch is configured to lock or release a rotation action of the planetary input gear, the clutch is accommodated in a shaft hole of a gear shaft of the planetary input gear, and the clutch comprises an inner gear and a movable member, wherein the inner gear is coaxially fastened to the shaft hole of the gear shaft of the planetary input gear, a groove is provided on an outer circumferential surface of the inner gear, an opening of the groove faces an inner circumferential surface of the shaft hole of the gear shaft of the planetary input gear , and a groove depth of the groove gradually decreases in a circumferential direction of the shaft hole of the gear shaft of the planetary input gear ; and the movable member is configured to move in the groove in the circumferential direction of the shaft hole of the gear shaft of the planetary input gear.
The electro-mechanical braking apparatus according to claim 12, wherein the inner gear comprises at least two grooves, a quantity of the movable members is the same as a quantity of the grooves, and each groove is provided to accommodate one movable member, wherein the at least two grooves are provided at equal spacings in a circumferential direction of the inner gear, and a minimum groove depth end of one of two adjacent grooves is close to a maximum groove depth end of the other groove in the circumferential direction of the inner gear.
The electro-mechanical braking apparatus according to claim 12, wherein the clutch comprises an elastic member, and the elastic member is configured to cooperate with the axial moving member to drive the movable member to move back and forth in a circumferential direction of the inner gear, wherein the axial moving member moves toward the clutch and drives the movable member to move clockwise in the circumferential direction of the inner gear, and when the axial moving member moves away from the clutch, the elastic member is configured to drive the movable member to move counterclockwise in the circumferential direction of the inner gear; or the axial moving member moves toward the clutch and drives the movable member to move counterclockwise in the circumferential direction of the inner gear, and when the axial moving member moves away from the clutch, the elastic member is configured to drive the movable member to move clockwise in the circumferential direction of the inner gear.
A vehicle, comprising wheels and the electro-mechanical braking apparatus according to any one of claims 1 to 14, wherein the electro-mechanical braking apparatus is configured to brake the wheels, wherein an axial direction of the brake motor, an axial direction of the input shaft, and an axial direction of the output shaft are parallel to axial directions of the wheels, and an arrangement direction of the input shaft and the output shaft is perpendicular to the axial directions of the wheels.

Description

TECHNICAL FIELD This application relates to the field of vehicle technologies, and specifically, to a side-mounted electro-mechanical braking apparatus and a vehicle. BACKGROUND An electro-mechanical braking apparatus (electro-mechanical brake, EMB) includes a brake motor, a mechanical transmission mechanism, and a brake. The brake motor drives the brake by using the mechanical transmission mechanism, which is characterized by a simple structure, a sensitive response, stable load transmission, and no need to provide a hydraulic pipeline, thereby improving safety, maneuverability, and comfort of a vehicle. In the existing electro-mechanical braking apparatus, the brake motor, the mechanical transmission mechanism, and the brake are independent components. This results in an excessively large volume of the electro-mechanical braking apparatus, while a wheel of the vehicle has limited space. SUMMARY This application provides a side-mounted electro-mechanical braking apparatus and a vehicle, which is characterized by a small volume and high transmission efficiency. According to a first aspect, the electro-mechanical braking system provided in this application includes a brake motor, a reducer, and a control circuit board. The control circuit board is configured to fasten a control circuit of the brake motor. The control circuit of the brake motor is configured to output an alternating current to drive the brake motor. The brake motor is configured to be in transmission connection to a brake by using the reducer. The brake is configured to brake wheels of the vehicle. The reducer includes an input shaft and an output shaft that are arranged in parallel. The input shaft is configured to be in transmission connection to a motor shaft of the brake motor. The output shaft is configured to drive the brake. In an axial direction of the brake motor, the input shaft is arranged between the motor shaft of the brake motor and the control circuit board, and the input shaft and the output shaft are arranged on a side that is of the control circuit board and that faces the brake motor. A thickness direction of the control circuit board is parallel to an axial direction of the input shaft, and a length direction of the control circuit board is parallel to an arrangement direction of the input shaft and the output shaft. The control circuit board side-mounted in the electro-mechanical braking apparatus provided in this application helps the electro-mechanical braking apparatus utilize side space of the wheel of the vehicle, and can further reduce occupied top space of the wheel of the vehicle. In addition, in the electro-mechanical braking apparatus provided in this application, the brake motor, and the input shaft and the output shaft of the reducer are arranged on a same side of the control circuit board. A braking force transmission path through which the brake motor drives the brake by using the reducer is on the same side of the control circuit board. This can reduce a length of the braking force transmission path, thereby providing high transmission efficiency. Moreover, in the electro-mechanical braking apparatus provided in this application, the control circuit board and the brake motor are respectively arranged on two sides of the reducer. This facilitates control of mutual isolation of a circuit component and a mechanical transmission mechanism, thereby improving reliability of the electro-mechanical braking apparatus. In an implementation, the electro-mechanical braking apparatus includes a position sensor, the position sensor is configured to detect a rotation angle of the brake motor, the position sensor includes a stator and a rotor, the control circuit board is configured to fasten the stator, and the input shaft is configured to be in coaxial transmission connection to the motor shaft of the brake motor and the rotor of the position sensor. In the electro-mechanical braking apparatus provided in this application, the stator of the position sensor and the control circuit of the brake motor are both fastened to the control circuit board. This facilitates an integrated design of circuit components in the electro-mechanical braking apparatus. In addition, the control circuit board and the brake motor are arranged on two sides of the input shaft of the reducer. This facilitates mounting and maintenance of the position sensor or another circuit component in the control circuit board. In an implementation, the reducer includes a motor gear and an output wheel, the motor gear is coaxially fastened to the input shaft, the motor gear is in transmission connection to the output wheel, the output wheel is configured to drive the output shaft to rotate, and the motor gear and the output wheel are arranged on a side that is of the control circuit board and that faces the brake motor. In the electro-mechanical braking apparatus provided in this application, the motor gear and the output wheel that are included in the reducer