EP-4737237-A1 - ELECTROMECHANICAL BRAKE APPARATUS COMPRISING IN-SHAFT LOCKING MECHANISM, SYSTEM, AND VEHICLE

EP4737237A1EP 4737237 A1EP4737237 A1EP 4737237A1EP-4737237-A1

Abstract

This application provides an electro-mechanical braking apparatus with an in-shaft locking mechanism, an electro-mechanical braking system, and a vehicle. The electro-mechanical braking apparatus includes a brake motor, a gearbox, a brake, and the locking mechanism. The brake motor is in transmission connection to the brake via the gearbox and drives the brake to brake the vehicle. The gearbox includes a gear shaft for implementing a transmission function. The locking mechanism is located on a side of the gearbox in an axial direction of the gear shaft. The locking mechanism includes a clutch, an axial moving part, and a locking motor. The clutch is accommodated in an inner hole of the gear shaft. The axial moving part is configured to move relative to the clutch in the axial direction of the gear shaft and control the clutch to lock or release the gear shaft. The locking motor is configured to drive the axial moving part to move away from or toward the clutch. The locking mechanism of the electro-mechanical braking apparatus in this application is disposed inside the gear shaft of the gearbox, and the electro-mechanical braking apparatus is small in volume and reliable in parking.

Inventors

MAO, Yan
YAN, Keyu
WU, Xiaopeng

Assignees

Huawei Digital Power Technologies Co., Ltd.

Dates

Publication Date: 20260506
Application Date: 20240520

Claims (15)

An electro-mechanical braking apparatus with an in-shaft locking mechanism, wherein the electro-mechanical braking apparatus comprises a brake motor, a gearbox, and the locking mechanism, the brake motor drives a brake via the gearbox to brake a vehicle, the gearbox comprises a gear shaft configured to implement a transmission function, the locking mechanism is located on a side of the gearbox in an axial direction of the gear shaft, and the locking mechanism comprises a clutch, an axial moving part, and a locking motor, wherein the clutch is accommodated in an inner hole of the gear shaft; the axial moving part is configured to move relative to the clutch in the axial direction of the gear shaft and control the clutch to lock or release the gear shaft; and the locking motor is configured to drive the axial moving part to move away from or toward the clutch.
The electro-mechanical braking apparatus according to claim 1, wherein the clutch comprises an inner gear and a movable part, wherein the inner gear is coaxially fastened to the gear shaft, an outer circumferential surface of the inner gear is provided with a groove, an opening of the groove faces an inner circumferential surface of the inner hole of the gear shaft, and a groove depth of the groove gradually decreases in a circumferential direction of the gear shaft; and the movable part is configured to move in the groove in the circumferential direction of the gear shaft.
The electro-mechanical braking apparatus according to claim 2, wherein the inner gear comprises at least two grooves, a quantity of movable parts is the same as a quantity of grooves, and each groove is configured to accommodate one movable part, wherein the at least two grooves are equally spaced from each other 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 3, wherein a minimum groove depth of each groove is less than a length of the movable part in a radial direction of the inner gear, and a maximum groove depth of each groove is greater than the length of the movable part in the radial direction of the inner gear.
The electro-mechanical braking apparatus according to claim 2, wherein the clutch comprises an elastic part, and the elastic part is configured to cooperate with the axial moving part to drive the movable part to move back and forth in the circumferential direction of the inner gear, wherein the axial moving part moves toward the clutch and drives the movable part to move clockwise in the circumferential direction of the inner gear, and when the axial moving part moves away from the clutch, the elastic part is configured to drive the movable part to move counterclockwise in the circumferential direction of the inner gear; or the axial moving part moves toward the clutch and drives the movable part to move counterclockwise in the circumferential direction of the inner gear, and when the axial moving part moves away from the clutch, the elastic part is configured to drive the movable part to move clockwise in the circumferential direction of the inner gear.
The electro-mechanical braking apparatus according to any one of claims 2 to 5, wherein the clutch comprises an end cover, wherein the end cover is disposed on a side that is of the inner gear and that is close to the locking motor in the axial direction of the gear shaft, an end face that is of the end cover and that faces the locking motor comprises a fitting opening, the fitting opening communicates with the groove in the axial direction of the gear shaft, and the axial moving part drives the movable part through the fitting opening.
The electro-mechanical braking apparatus according to any one of claims 2 to 5, wherein the axial moving part comprises a transmission portion and a pushing portion, wherein the transmission portion is configured to be in transmission connection to a motor shaft of the locking motor and move in a direction of the motor shaft of the locking motor with rotation of the motor shaft of the locking motor; and the pushing portion is configured to receive a driving force of the transmission portion to move in the direction of the motor shaft of the locking motor and drive the movable part.
The electro-mechanical braking apparatus according to claim 7, wherein an end that is of the pushing portion and that faces the clutch comprises a fitting slope, and a tilt direction of the fitting slope intersects an axial direction of the motor shaft of the locking motor.
The electro-mechanical braking apparatus according to claim 7, wherein the transmission portion comprises a transmission screw and a threaded hole, the threaded hole penetrates the transmission portion in the direction of the motor shaft of the locking motor, the transmission screw is sleeved on the motor shaft of the locking motor and is fastened to the motor shaft of the locking motor, the transmission portion is sleeved on the transmission screw through the threaded hole, and an outer thread of the transmission screw is engaged with an inner thread of the threaded hole.
The electro-mechanical braking apparatus according to any one of claims 1 to 5, wherein in the axial direction of the gear shaft, the axial moving part is located between the clutch and the locking motor, and axes of the locking motor, the axial moving part, the clutch, and the gear shaft coincide.
An electro-mechanical braking system, wherein the electro-mechanical braking system comprises a brake and the electro-mechanical braking apparatus according to any one of claims 1 to 10, and the electro-mechanical braking apparatus is configured to drive the brake to brake a vehicle, wherein in an axial direction of a gear shaft of a gearbox in the electro-mechanical braking apparatus, the brake is arranged opposite to a locking mechanism in the electro-mechanical braking apparatus; and in a direction perpendicular to the gear shaft, the brake is arranged adjacently to a brake motor in the electro-mechanical braking apparatus.
The electro-mechanical braking system according to claim 11, wherein the gearbox comprises a planetary gear train, an axis of the planetary gear train coincides with an axis of the gear shaft, the gear shaft is disposed at an input end of the planetary gear train, and an output end of the planetary gear train is in transmission connection to a reversing mechanism of the brake.
The electro-mechanical braking system according to claim 12, wherein the reversing mechanism of the brake comprises a ball screw, the ball screw comprises a screw rod and a screw sleeve that are engaged with each other, the screw rod is in coaxial transmission with the output end of the planetary gear train, and the screw sleeve of the ball screw is configured to push a friction plate of the brake to move in an axial direction of the reversing mechanism to brake the vehicle.
The electro-mechanical braking system according to claim 12, wherein the gearbox comprises a motor gear and a planetary input gear, the motor gear is coaxially fastened to a motor shaft of the brake motor, the planetary input gear is coaxially fastened to the gear shaft, and in the direction perpendicular to the gear shaft, the motor gear and the planetary input gear are spaced from each other and in transmission connection.
A vehicle, comprising a wheel and the electro-mechanical braking system according to any one of claims 11 to 14, wherein the electro-mechanical braking apparatus is configured to brake the wheel.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to Chinese Patent Application No. 202321852965.4, filed with the China National Intellectual Property Administration on July 13, 2023 and entitled "ELECTRO-MECHANICAL BRAKING APPARATUS WITH IN-SHAFT LOCKING MECHANISM, SYSTEM, AND VEHICLE", which is incorporated herein by reference in its entirety. TECHNICAL FIELD This application relates to the field of vehicle technologies, and in particular, to an electro-mechanical braking apparatus with an in-shaft locking mechanism and a vehicle. BACKGROUND An electro-mechanical braking apparatus (electro-mechanical brake, EMB) uses a motor and a mechanical transmission mechanism together to drive a brake to brake. The electro-mechanical braking apparatus has a simple structure, a sensitive response, stable load transfer, no hydraulic pipe, and high transfer efficiency. The electro-mechanical braking apparatus can improve safety, maneuverability, and comfort of a vehicle. The electro-mechanical braking apparatus is usually further equipped with a locking mechanism to implement a parking function. Limited by internal space of the vehicle, the electro-mechanical braking apparatus needs to properly arrange relative positions of the motor, the mechanical transmission mechanism, the brake, and the locking mechanism, to implement miniaturization while implementing the function, and save the internal space of the vehicle. SUMMARY This application provides an electro-mechanical braking apparatus with an in-shaft locking mechanism and a vehicle. The electro-mechanical braking apparatus has a small volume and implements parking. This application specifically includes the following solutions. According to a first aspect, this application provides an electro-mechanical braking apparatus with an in-shaft locking mechanism. The electro-mechanical braking apparatus includes a brake motor, a gearbox, and the locking mechanism. The brake motor drives a brake via the gearbox to brake a vehicle. The gearbox includes a gear shaft configured to implement a transmission function. The locking mechanism is located on a side of the gearbox in an axial direction of the gear shaft. The locking mechanism includes a clutch, an axial moving part, and a locking motor. The clutch is accommodated in an inner hole of the gear shaft. The axial moving part is configured to move relative to the clutch in the axial direction of the gear shaft and control the clutch to lock or release the gear shaft. The locking motor is configured to drive the axial moving part to move away from or toward the clutch. In this application, the electro-mechanical braking apparatus drives the gearbox via the brake motor to rotate, to drive the brake to brake the vehicle. When the vehicle is parked, the gear shaft of the gearbox can be locked by the locking mechanism, to control the gearbox to stop transmission. In this case, the brake locks a brake disc to implement a parking function. In this application, the electro-mechanical braking apparatus drives the axial moving part via the locking motor to move away from or toward the clutch, to drive the clutch to lock or release the gear shaft. In this application, the clutch of the electro-mechanical braking apparatus is disposed in the inner hole of the gear shaft. This reduces an overall volume of the locking mechanism. Therefore, the electro-mechanical braking apparatus in this application has a small volume while implementing a parking function. In an implementation, the clutch includes an inner gear and a movable part. The inner gear is coaxially fastened to the gear shaft, an outer circumferential surface of the inner gear is provided with a groove, an opening of the groove faces an inner circumferential surface of the inner hole of the gear shaft, and a groove depth of the groove gradually decreases in a circumferential direction of the gear shaft. The movable part is configured to move in the groove in the circumferential direction of the gear shaft. In this implementation, a groove depth of the groove defined by the clutch may be changed. In this case, when the movable part moves in the groove to a position with a large groove depth, the movable part and the inner circumferential surface of the inner hole of the gear shaft are separated or have a small contact force, and the gear shaft can rotate in the gearbox and implement the transmission function of the gearbox. When the movable part moves in the groove to a position with a small groove depth, the contact force between the movable part and the inner circumferential surface of the inner hole of the gear shaft is large, and a friction force between the gear shaft and the movable part increases accordingly, so that the gear shaft cannot rotate in the gearbox, and the transmission function of the gearbox is suspended. In this implementation, the clutch can release or lock rotation of the gear shaft. In an implementation, the inner gear includes at le