WO-2026091381-A1 - ACTUATOR ASSEMBLY OF ELECTROMECHANICAL BRAKE, ELECTROMECHANICAL BRAKE AND VEHICLE

WO2026091381A1WO 2026091381 A1WO2026091381 A1WO 2026091381A1WO-2026091381-A1

Abstract

An actuator assembly of an electromechanical brake, comprising a housing (100) and a support (200), wherein the support is connected to a first end (101) of the housing, and an inner friction plate (300) and an outer friction plate (400) are mounted on the support. A driving mechanism (500), a transmission mechanism (600) and an actuating mechanism (700) are arranged in the housing, wherein the driving mechanism is arranged side by side on a side surface of the actuating mechanism, and the transmission mechanism is connected between the driving mechanism and the actuating mechanism and transmits the output of the driving mechanism to the actuating mechanism. The actuating mechanism comprises a rotating assembly (710) and an actuating assembly (720), wherein the rotating assembly is rotatably connected outside the actuating assembly and is connected to the transmission mechanism, the actuating assembly is connected to the inner friction plate, and the rotating assembly is driven by the transmission mechanism to rotate around a first axis and drive the actuating assembly to move along the first axis. Further disclosed are an electromechanical brake and a vehicle. The actuator assembly has the advantages of a shorter axial space, a greater clamping force on a brake disc, a lead screw being capable of retracting, in a timely manner, to achieve zero drag when clamping is released, the overall structure being more compact, and the installation cost and assembly difficulty being low.

Inventors

SHAO, LIANG

Assignees

上海华申瑞利汽车科技有限公司

Dates

Publication Date: 20260507
Application Date: 20250319
Priority Date: 20241030

Claims (18)

An actuation assembly for an electromechanical brake, characterized in that it includes a housing and a bracket, the bracket being connected to a first end of the housing, and an inner friction plate disposed near the housing and an outer friction plate disposed away from the housing are mounted on the bracket; The housing contains a drive mechanism, a transmission mechanism, and an actuator. The drive mechanism is arranged side by side on the side of the actuator. The transmission mechanism connects the drive mechanism and the actuator and transmits the output of the drive mechanism to the actuator. The actuator includes a rotating component and an actuating component. The rotating component is rotatably connected to the outside of the actuating component and connected to the transmission mechanism. The actuating component is connected to the internal friction plate. The rotating component rotates around a first axis under the drive of the transmission mechanism and drives the actuating component to move along the first axis. The actuating component includes a lead screw and a baffle, the baffle being fixedly connected to the lead screw and located between the lead screw and the internal friction plate; The rotating assembly includes a nut, which is sleeved on the lead screw and rotatably connected to the lead screw; the nut includes a proximal end near the inner friction plate and a distal end away from the inner friction plate; The transmission mechanism includes an output wheel, which is sleeved on the near end of the nut and fixedly connected to the nut. The output wheel drives the nut to rotate around the first axis, and the nut drives the lead screw to move along the first axis.
According to claim 1, the electromechanical brake actuator assembly is characterized in that the housing has an actuator inner shell, the actuator inner shell is cylindrical along the first axis, the actuator inner shell surrounds a first chamber, the actuator inner shell is surrounded by a second chamber, the first chamber and the second chamber are connected at the first end, the actuator is disposed in the first chamber and extends to the first end, and the drive mechanism and the transmission mechanism are disposed in the second chamber.
The actuator assembly of the electromechanical brake according to claim 2 is characterized in that the nut has a backstop protrusion, the inner wall of the actuator housing has a backstop boss, the backstop protrusion is located between the backstop boss and the output wheel on the first axis, and there is a gap between the backstop protrusion and the backstop boss.
The actuator assembly of the electromechanical brake according to claim 3 is characterized in that the nut has a retaining ring, and the output wheel is fixedly connected to the nut through the retaining ring.
The actuation assembly of the electromechanical brake according to claim 3 is characterized in that an anti-wear member is provided between the nut and the actuation inner housing, and the anti-wear member extends along the first axis.
The actuator assembly of the electromechanical brake according to claim 1 is characterized in that the lead screw and the baffle are fixed together by a screw, the screw passing through the baffle from the first end along the first axis and extending into the lead screw for fixing.
The actuation assembly of the electromechanical brake according to claim 1 is characterized in that the diameter of the baffle is greater than the diameter of the lead screw and less than the minimum outer diameter of the inner friction plate relative to the first axis.
The electromechanical brake assembly according to claim 1 is characterized in that the drive mechanism includes a drive motor and a motor gear, the motor gear is disposed on the drive motor, the motor gear has a second axis, the second axis is parallel to the first axis, the rotating component includes a lead screw nut, the transmission mechanism includes a planetary gear assembly, an intermediate gear assembly and an output wheel, the planetary gear assembly is connected to the motor gear by tooth surface meshing, the motor gear and the planetary gear assembly are coaxially arranged on the second axis, the intermediate gear assembly is connected between the planetary gear assembly and the output wheel, and the output wheel is sleeved on the lead screw nut and fixedly connected to the lead screw nut.
The electromechanical brake assembly according to claim 8 is characterized in that the planetary gear assembly includes a planet carrier, a planet carrier shaft, a ring gear, and a plurality of planetary gears. The planet carrier is fixed between the drive motor and the housing on the second axis via the planet carrier shaft. The ring gear and the plurality of planetary gears are rotatably fixed in the planet carrier. The plurality of planetary gears are meshed with the ring gear via tooth surfaces. The plurality of planetary gears are connected to the motor gear via tooth surface meshing. The plurality of planetary gears are arranged around the motor gear. The outer surface of the planet carrier is a tooth surface.
The electromechanical brake assembly according to claim 8 is characterized in that the intermediate wheel assembly includes an intermediate wheel and an intermediate wheel shaft, the intermediate wheel is mounted on the housing via the intermediate wheel shaft, the intermediate wheel is connected between the planetary gear assembly and the output wheel, and the planetary gear assembly is connected to the intermediate wheel and the intermediate wheel, and the intermediate wheel is connected to the output wheel by tooth surface meshing.
The actuator assembly of the electromechanical brake according to claim 8 is characterized in that the motor gear extends from the drive motor toward the first end.
The actuator assembly of the electromechanical brake according to claim 1 is characterized in that a buffer member is further provided between the housing and the rotating assembly, and the buffer member is fixedly connected to the inner wall of the housing.
The actuation assembly of the electromechanical brake according to claim 12 is characterized in that the buffer and the housing are connected by an anti-rotation component.
The electromechanical brake assembly according to claim 13 is characterized in that the anti-rotation component includes an anti-rotation protrusion and an anti-rotation groove, the anti-rotation groove extending axially, one of the anti-rotation protrusion and the anti-rotation groove being disposed on the buffer member, and the other being disposed on the housing.
The actuation assembly of the electromechanical brake according to claim 14 is characterized in that the buffer has an anti-rotation structure that extends into the actuation assembly, and the actuation assembly can move relative to the buffer through the anti-rotation structure to prevent the actuation assembly from rotating around the first axis with the rotating assembly.
The actuation assembly of the electromechanical brake according to claim 14 is characterized in that an elastic pad is further provided between the buffer and the rotating assembly, and the elastic pad is clamped by the buffer and the rotating assembly on the first axis.
An electromechanical brake, characterized in that it includes the actuation assembly as described in any one of claims 1-16.
A vehicle characterized by comprising the electromechanical brake as described in claim 17.

Description

Electromechanical brake actuator assembly, electromechanical brake and vehicle Technical Field This invention relates to the field of brake technology, and more particularly to an electromechanical brake actuator assembly, an electromechanical brake, and a vehicle. Background Technology Electromechanical brakes are used in vehicle braking systems; with the development of new technologies such as vehicle electrification and autonomous driving, new demands have been placed on the electrification of vehicle braking systems. Traditional vehicle braking systems are hydraulic, requiring the driver to pressurize the system via the brake pedal. This traditional system is not ideal for features like autonomous driving. Electromechanical brakes, on the other hand, allow for electronic control of the braking system. Vehicle braking signals are transmitted to the brake system controller, which then drives the braking system via an electronically controlled motor. Furthermore, the application of electromechanical brakes simplifies the overall vehicle braking structure. However, existing electromechanical brakes have several problems in application. For example, the connection between the output wheel and the lead screw has several drawbacks. First, the connection uses a spline or gear meshing, which increases the connection difficulty and the number of parts. Second, the output wheel must be connected to the lead screw at the end furthest from the friction plate, resulting in a large axial space. Furthermore, this connection leads to an excessive force transmission distance, insufficient clamping force, and lingering during the clamping and releasing of the friction plate. Moreover, existing technologies suffer from numerous parts, high installation costs, difficulty in assembly, and a less compact internal structure, all of which are technical problems that need to be addressed by those skilled in the art. Summary of the Invention One of the objectives of this invention is to overcome the shortcomings of the prior art and, in view of the above-mentioned problems existing in the vehicle braking system of the prior art, to provide an electromechanical brake actuator assembly, an electromechanical brake, and a vehicle. To achieve the above objectives, the present invention is implemented through the following technical solution: In a first aspect, the present invention provides an actuation assembly for an electromechanical brake, comprising a housing and a bracket, the bracket being connected to a first end of the housing, and an inner friction plate disposed near the housing and an outer friction plate disposed away from the housing mounted on the bracket; The housing contains a drive mechanism, a transmission mechanism, and an actuator. The drive mechanism is arranged side by side on the side of the actuator. The transmission mechanism connects the drive mechanism and the actuator and transmits the output of the drive mechanism to the actuator. The actuator includes a rotating component and an actuating component. The rotating component is rotatably connected to the outside of the actuating component and connected to the transmission mechanism. The actuating component is connected to the internal friction plate. The rotating component rotates around a first axis under the drive of the transmission mechanism and drives the actuating component to move along the first axis. The actuating component includes a lead screw and a baffle, the baffle being fixedly connected to the lead screw and located between the lead screw and the internal friction plate; The rotating assembly includes a nut, which is sleeved on the lead screw and rotatably connected to the lead screw; the nut includes a proximal end near the inner friction plate and a distal end away from the inner friction plate; The transmission mechanism includes an output wheel, which is sleeved on the near end of the nut and fixedly connected to the nut. The output wheel drives the nut to rotate around the first axis, and the nut drives the lead screw to move along the first axis. In a preferred embodiment of this application, the housing has an inner execution shell, which is cylindrical along the first axis and forms a first chamber. The inner execution shell is surrounded by a second chamber. The first chamber and the second chamber are connected at the first end. The execution mechanism is disposed in the first chamber and extends out of the first end. The drive mechanism and the transmission mechanism are disposed in the second chamber. In a preferred embodiment of this application, the nut has a backstop protrusion, and the inner wall of the actuator housing has a backstop boss. The backstop protrusion is located between the backstop boss and the output wheel on the first axis, and there is a gap between the backstop protrusion and the backstop boss. In a preferred embodiment of this application, the nut has a retaining ring, and the output wheel is fixedly connec