Electromechanical brake actuator assembly, electromechanical brake and vehicle

Abstract

The present invention discloses an execution assembly of an electronic mechanical brake, an electronic mechanical brake and a vehicle, comprising a housing and a bracket, wherein the bracket is connected to the first end of the housing, and an inner friction plate and an outer friction plate are installed on the bracket; a driving mechanism, a transmission mechanism and an execution mechanism are arranged in the housing, wherein the driving mechanism is arranged side by side on the side of the execution mechanism, and the transmission mechanism is connected between the driving mechanism and the execution mechanism and transmits the output of the driving mechanism to the execution mechanism; the execution mechanism comprises a rotating assembly and an execution assembly, wherein the rotating assembly is rotationally connected outside the execution assembly and connected to the transmission mechanism, the execution assembly is connected to the inner friction plate, and the rotating assembly rotates around a first axis under the drive of the transmission mechanism and drives the execution assembly to move along the first axis. The technical solution of the present invention has the advantages of shorter axial space, greater clamping force on the brake disc, the screw rod can be timely retreated to achieve zero drag when clamping and releasing, more compact overall structure, low installation cost and assembly difficulty, etc.

Description

Technical Field

[0001] The present invention relates to the technical field of brakes, and in particular to an actuating assembly of an electromechanical brake, an electromechanical brake and a vehicle. Background Art

[0002] 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 put forward for the electrification of vehicle braking systems.

[0003] The traditional vehicle braking system is a hydraulic braking system. During the braking process, the driver needs to use the brake pedal and pressurize the braking system to achieve the braking function. This traditional braking system is not very conducive to the realization of functions such as vehicle automatic driving. Electromechanical brakes can realize the electronic control of the braking system. The vehicle braking is transmitted to the brake system controller in the form of electrical signals, and the vehicle braking function is achieved through the electronically controlled motor-driven braking system. At the same time, the application of electromechanical brakes also makes the braking structure of the entire vehicle relatively simple.

[0004] However, there are some problems in the application of existing electronic mechanical brakes. For example, the output wheel is connected to the screw rod by spline connection or gear meshing, which increases the difficulty of connection and leads to a large number of parts. The output wheel must be connected to the screw rod at the end of the screw rod away from the friction plate, resulting in a large axial space. Moreover, the output wheel is connected to the screw rod at the end of the screw rod away from the friction plate, resulting in a large force transmission distance, insufficient clamping force, and dragging during the clamping and release process of the friction plate. In addition, the prior art has the disadvantages of a large number of parts, high installation cost, and difficulty in assembly, and the internal structure of the brake is not compact enough, which are technical problems that technical personnel in the field need to solve. Summary of the invention

[0005] One of the purposes of the present invention is to overcome the deficiencies in the prior art and to provide an electromechanical brake actuator assembly, an electromechanical brake and a vehicle in view of the above-mentioned problems existing in the vehicle brake system in the prior art.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] In a first aspect, the present invention provides an actuator assembly of an electronic mechanical brake, comprising a housing and a bracket, wherein the bracket is connected to a first end of the housing, and an inner friction plate disposed close to the housing and an outer friction plate disposed away from the housing are mounted on the bracket;

[0008] A driving mechanism, a transmission mechanism and an actuator are arranged in the housing, the driving mechanism is arranged side by side on the side of the actuator, the transmission mechanism is connected between the driving mechanism and the actuator and transmits the output of the driving mechanism to the actuator;

[0009] The actuator comprises a rotating assembly and an actuator assembly, wherein the rotating assembly is rotatably connected to the outside of the actuator assembly and connected to the transmission mechanism, the actuator 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 actuator assembly to move along the first axis;

[0010] The actuator assembly includes a screw rod and a baffle, wherein the baffle is fixedly connected to the screw rod and is located between the screw rod and the inner friction plate;

[0011] The rotating assembly includes a nut, which is sleeved outside the screw rod and rotatably connected to the screw rod; the nut includes a proximal end close to the inner friction plate and a distal end away from the inner friction plate;

[0012] The transmission mechanism comprises an output wheel, which is sleeved on the proximal end of the nut and fixedly connected to the nut. The nut is driven to rotate around the first axis by the output wheel, and the nut drives the screw rod to move along the first axis.

[0013] In a preferred embodiment of the present application, the shell body has an actuator inner shell, the actuator inner shell is cylindrical along the first axis, the actuator inner shell surrounds a first chamber, the outside of the actuator inner shell is a second chamber, the first chamber and the second chamber are connected at the first end, the actuator mechanism is arranged in the first chamber and extends to the first end, and the drive mechanism and the transmission mechanism are arranged in the second chamber.

[0014] In a preferred embodiment of the present application, the nut has a stop protrusion, the inner wall of the actuator inner shell has a stop boss, and on the first axis the stop protrusion is located between the stop boss and the output wheel, and there is a gap between the stop protrusion and the stop boss.

[0015] In a preferred embodiment of the present application, the nut is provided with a fixing ring, and the output wheel is fixedly connected to the nut via the fixing ring.

[0016] In a preferred embodiment of the present application, an anti-wear component is provided between the nut and the actuator inner shell, and the anti-wear component extends along the first axis.

[0017] In a preferred embodiment of the present application, the screw rod and the baffle are fixed by screws, and the screws pass through the baffle plate from the first end along the first axis and extend into and are fixed in the screw rod.

[0018] In a preferred embodiment of the present application, the diameter of the baffle is larger than the diameter of the screw rod and smaller than the minimum outer diameter of the inner friction plate relative to the first axis.

[0019] In a preferred embodiment of the present application, the driving mechanism includes a driving motor and a motor gear, the motor gear is arranged on the driving motor, the motor gear has a second axis, the second axis is parallel to the first axis, the rotating assembly includes a nut, and the transmission mechanism includes a planetary gear assembly, an intermediate wheel 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 wheel assembly is connected between the planetary gear assembly and the output wheel, and the output wheel is sleeved outside the nut and fixedly connected to the nut.

[0020] In a preferred embodiment of the present application, the planetary gear assembly includes a planet carrier, a planet carrier shaft, a ring gear and a plurality of planetary wheels, the planet carrier is fixed between the drive motor and the housing on the second axis through the planet carrier shaft, the ring gear and the plurality of planetary wheels are rotatably fixed in the planet carrier, the plurality of planetary wheels are meshed with the ring gear through tooth surfaces, the plurality of planetary wheels are connected to the motor gear through tooth surface meshing, the plurality of planetary wheels are arranged around the motor gear, and the outer surface of the planet carrier is a tooth surface.

[0021] In a preferred embodiment of the present application, 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 and the intermediate wheel, as well as the intermediate wheel and the output wheel are connected via tooth meshing.

[0022] In a preferred embodiment of the present application, the motor gear extends from the drive motor toward the first end.

[0023] In a preferred embodiment of the present application, a buffer is further provided between the housing and the rotating assembly, and the buffer is fixedly connected to the inner wall of the housing.

[0024] In a preferred embodiment of the present application, the buffer member and the housing are connected via a rotation-stop assembly.

[0025] In a preferred embodiment of the present application, the anti-rotation assembly includes an anti-rotation protrusion and an anti-rotation groove, the anti-rotation groove extends axially, one of the anti-rotation protrusion and the anti-rotation groove is arranged on the buffer member, and the other is arranged on the shell.

[0026] In a preferred embodiment of the present application, the buffer member has an anti-rotation structure, which extends into the actuator component. The actuator component can move relative to the buffer member through the anti-rotation structure to prevent the actuator component from rotating around the first axis with the rotating component.

[0027] In a preferred embodiment of the present application, an elastic gasket is further provided between the buffer component and the rotating assembly, and the elastic gasket is clamped by the buffer component and the rotating assembly on the first axis.

[0028] In a second aspect, the present invention provides an electronic mechanical brake, comprising the actuator assembly as described in the first aspect.

[0029] In a third aspect, the present invention provides a vehicle comprising the electromechanical brake as described in the second aspect.

[0030] The actuator assembly, electronic mechanical brake and vehicle of the electronic mechanical brake disclosed in the present invention have the advantages of shorter axial space, greater clamping force on the brake disc, the screw rod can be timely retreated to achieve zero drag when clamping and releasing, more compact overall structure, low installation cost and assembly difficulty. The actuator assembly, electronic mechanical brake and vehicle of the electronic mechanical brake in the present invention, because the output wheel is sleeved on the nut to drive the nut to rotate, and the nut drives the screw rod to move linearly, therefore, the output wheel can be sleeved on the near end of the nut near the inner friction plate, and such a setting has advantages not found in the prior art: first, when in use, the output wheel is closer to the inner friction plate, the force transmission distance is short, and the output clamping force is greater; second, the output wheel does not need to be connected to the screw rod near the far end of the nut, so the axial size of the present invention is smaller. In the present invention, the output wheel is directly sleeved on the nut, and no other parts are required. Compared with the method of connecting the output wheel with the screw rod, it is easier to implement and has fewer parts. Since there is no need to set a transmission mechanism such as an output wheel at the far end of the nut, the space saved at this end can be used to set up other functional components, such as circuit boards, force sensors, etc., making the product more selective in structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present invention is described with the aid of the following drawings:

[0032] Figure 1 is a schematic diagram of an electronic mechanical brake provided in a vehicle according to an embodiment of the present invention;

[0033] Figure 2is a structural schematic diagram of an execution assembly of an electronic mechanical brake in an embodiment of the present invention;

[0034] Figure 3 yes Figure 2 AA section view;

[0035] Figure 4 yes Figure 2 BB cross-section diagram.

[0036] Reference numerals:

[0037] 1-Electromechanical brake; 2-Wheel;

[0038] 100-housing; 101-first end; 102-second end; 110-executing inner housing; 111-retracting boss; 112-anti-wear member; 120-first chamber; 130-second chamber; 200-bracket; 201-return spring; 300-inner friction plate; 400-outer friction plate; 500-driving mechanism; 510-driving motor; 520-motor gear; 600-transmission mechanism; 610-planetary gear assembly; 611-planet carrier; 612-planet carrier axle; 613 -ring gear; 614-planetary gear; 620-intermediate wheel assembly; 621-intermediate wheel; 622-intermediate wheel shaft; 630-output wheel; 700-actuator; 710-rotation assembly; 711-nut; 712-stop protrusion; 713-fixing ring; 720-actuator assembly; 721-screw rod; 722-baffle; 723-screw; 800-buffer; 901-stop protrusion; 902-stop groove; 903-anti-rotation structure; X1-first axis; X2-second axis. DETAILED DESCRIPTION

[0039] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0040] It should be clear that the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0041] like Figure 1 As shown, an embodiment of the present invention discloses a vehicle, including an electromechanical brake 1 arranged on four wheels 2. The electromechanical brake 1 includes an actuating assembly.

[0042] like Figure 2As shown, the actuator assembly of the electronic mechanical brake 1 of this embodiment includes a housing 100 and a bracket 200, the bracket 200 is connected to the first end 101 of the housing 100, and the bracket 200 is installed with an inner friction plate 300 arranged close to the housing 100 and an outer friction plate 400 arranged away from the housing 100. A driving mechanism 500, a transmission mechanism 600 and an actuator 700 are arranged in the housing 100, the driving mechanism 500 is arranged side by side on the side of the actuator 700, the transmission mechanism 600 is connected between the driving mechanism 500 and the actuator 700 and transmits the output of the driving mechanism 500 to the actuator 700. The actuator 700 includes a rotating assembly 710 and an actuator 720, the rotating assembly 710 is rotatably connected outside the actuator 720 and connected to the transmission mechanism 600, the actuator 720 is connected to the inner friction plate 300, and the rotating assembly 710 rotates around the first axis X1 driven by the transmission mechanism 600 and drives the actuator 720 to move along the first axis X1.

[0043] In the actuator assembly of the present embodiment, the housing 100 has an actuator inner shell 110, which is cylindrical along the first axis X1, and the actuator inner shell 110 encloses a first chamber 120, and the second chamber 130 is outside the actuator inner shell 110. The first chamber 120 and the second chamber 130 are connected at the first end 101, and the actuator 700 is arranged in the first chamber 120 and extends toward the first end 101, and the driving mechanism 500 and the transmission mechanism 600 are arranged in the second chamber 130. The actuator inner shell 110 is used to define the position and working space of the actuator 700, so that the rotating assembly 710 can rotate strictly around the first axis X1 without deviation when rotating, and the actuator 720 can strictly follow the first axis X1 when moving without deviation, and the first chamber 120 and the second chamber 130 are separated so that the driving mechanism 500 and the actuator 700 will not interfere with each other when working. Furthermore, in the execution assembly of the present embodiment, components such as the motor fixing housing 100 and the gear transmission retaining frame required for a separate electronic actuator are eliminated, thereby reducing the installation cost and the difficulty of component assembly.

[0044] In the execution assembly of this embodiment, the driving mechanism 500 includes a driving motor 510 and a motor gear 520, and the motor gear 520 is arranged on the driving motor 510. The transmission mechanism 600 includes a planetary gear assembly 610, an intermediate wheel assembly 620 and an output wheel 630, and the intermediate wheel assembly 620 is connected between the planetary gear assembly 610 and the output wheel 630. In the execution mechanism 700, the rotating assembly 710 includes a nut 711, and the execution assembly 720 includes a screw rod 721 and a baffle 722, and the baffle 722 is fixedly connected to the screw rod 721 and is located between the screw rod 721 and the inner friction plate 300.

[0045] In the drive mechanism 500, the drive motor 510 can be a linear motor or a brushless DC motor. The motor gear 520 has a second axis X2, and the second axis X2 is parallel to the first axis X1, which can facilitate the arrangement of the planetary gear assembly 610, the intermediate wheel assembly 620 and the output wheel 630 in the transmission mechanism 600. The motor gear 520 extends from the drive motor 510 to the first end 101.

[0046] In the transmission mechanism 600, the planetary gear assembly 610 is connected to the motor gear 520 by tooth surface meshing, and the planetary gear assembly 610 and the motor gear 520 are coaxially arranged on the second axis X2. The planetary gear assembly 610 includes a planet carrier 611, a planet carrier axle 612, a ring gear 613 and a plurality of planetary gears 614. The planet carrier 611 is fixed between the drive motor 510 and the housing 100 on the second axis X2 through the planet carrier axle 612. The ring gear 613 and the plurality of planetary gears 614 are rotatably fixed in the planet carrier 611. The motor gear 520 is a sun gear of the plurality of planetary gears 614. The plurality of planetary gears 614 are meshed with the ring gear 613 by tooth surfaces. The plurality of planetary gears 614 are connected to the motor gear 520 by tooth surface meshing. The plurality of planetary gears 614 are arranged around the motor gear 520, and the outer surface of the planet carrier 611 is a tooth surface. The intermediate wheel assembly 620 includes an intermediate wheel 621 and an intermediate wheel shaft 622. The intermediate wheel 621 is installed on the housing 100 through the intermediate wheel shaft 622. The intermediate wheel 621 is connected between the planetary gear assembly 610 and the output wheel 630. The planetary gear assembly 610 and the intermediate wheel 621, and the intermediate wheel 621 and the output wheel 630 are all connected by tooth surface meshing. The output wheel 630 is sleeved outside the nut 711 and fixedly connected to the nut 711. The function of the transmission mechanism 600 is to reduce speed and increase torque. The first stage of reduction is to reduce speed and increase torque through the planetary wheel 614 and the ring gear 613, and then the second stage of reduction and increase torque is performed through the tooth surface of the planetary carrier 611, the intermediate wheel 621 and the output wheel 630. The last stage of the output wheel 630 drives the nut 711 to rotate. In the execution assembly of the present embodiment, the output wheel 630 is directly fixedly connected with the nut 711 so as to rotate together, which replaces the spline connection between the electronic actuator 700 and the screw rod 721 in the prior art. This can effectively prevent the problem of spline breakage under high torque and solve the bottleneck of the transmission mechanism 600 when transmitting high torque, thereby realizing a large clamping force design.

[0047] In the actuator 700, the nut 711 only performs rotational motion. The nut 711 is sleeved outside the screw rod 721 and is rotationally connected to the screw rod 721. The nut 711 is driven to rotate around the first axis X1 by the output wheel 630, and the nut 711 drives the screw rod 721 to move along the first axis X1. The nut 711 has a stop protrusion 712 and a fixing ring 713, and the inner wall of the actuator inner shell 110 has a stop boss 111. On the first axis X1, the stop protrusion 712 is located between the stop boss 111 and the output wheel 630, and there is a gap between the stop protrusion 712 and the stop boss 111. The output wheel 630 is fixedly connected to the nut 711 through the fixing ring 713. An anti-wear member 112 is provided between the nut 711 and the inner housing 110. The anti-wear member 112 extends along the first axis X1 and may be an oil-containing bearing, which can increase the number of rotation lifespans of the nut 711 and reduce the wear of the nut 711. The screw 721 and the baffle 722 are fixed by screws 723. The screw 723 passes through the baffle 722 from the first end 101 along the first axis X1 and extends into and is fixed in the screw 721. The baffle on the screw 721 extends to drive the inner friction plate 300 forward to achieve clamping. The screw 721 and the baffle 722 retract to drive the inner friction plate 300 to retract to achieve release. The diameter of the baffle 722 is greater than the diameter of the screw 721 and smaller than the minimum outer diameter of the inner friction plate 300 relative to the first axis X1. The baffle plate 722 and the inner friction plate 300 can be connected as a whole or only have a contact relationship. When the baffle plate 722 and the inner friction plate 300 are in contact with each other, the force of the screw rod 721 extending to push the baffle plate 722 and retracting to pull the baffle plate 722 can respond to the inner friction plate 300 immediately, but the retraction stroke of the screw rod 721 will be limited; when the baffle plate 722 abuts against the inner friction plate 300, the inner friction plate 300 is returned to the original position by the return spring 201 set on the bracket 200. Active return is used to achieve release. There may be a certain delay in the force of the screw rod 721 extending to push the baffle 722 and retracting to pull the baffle 722, but the retraction stroke of the screw rod 721 will not be limited. In both cases, since the piston design is eliminated in the actuator 700, the clamping and releasing action is directly achieved by the extension and retraction of the screw rod 721, and the baffle 722 is fixed on the screw rod 721. When the screw rod 721 retracts, it can directly pull the baffle back, thereby achieving zero drag.

[0048] The execution assembly of this embodiment interchanges the working modes of the original nut 711 and the screw rod 721, and adopts the method that the nut 711 sleeved outside the screw rod 721 rotates around the first axis X1 to drive the screw rod 721 located inside to move linearly along the first axis X1, so that the transmission mechanism 600 with the function of reducing speed and increasing torque can be arranged in the length overlap section of the screw rod 721, making excellent use of the axial space of the execution assembly, shortening the axial length between the two ends of the housing 100 on the first axis X1, making the structure inside the housing 100 compact, and can adapt to the situation where the chassis brake has only a very small installation space. In the case where the space available for arrangement at the wheel 2 is very small, it can prevent interference between the electronic mechanical brake 1 and the control arm, positioning arm, shock absorber, steering rod and other components in the extreme space.

[0049] A buffer 800 is also provided between the housing 100 and the rotating assembly 710. The buffer 800 is fixedly connected to the inner wall of the housing 100, which may also be the inner wall of the inner shell 110. The buffer 800 is connected to the housing 100 via a rotation-stop assembly, such as Figure 3 As shown, the anti-rotation assembly includes an anti-rotation protrusion 901 and an anti-rotation groove 902, and the anti-rotation groove 902 extends axially. One of the anti-rotation protrusion 901 and the anti-rotation groove 902 is arranged on the buffer 820, and the other is arranged on the shell 100. In this embodiment, the anti-rotation protrusion 901 is a structure protruding from the outer wall of the buffer 800, and the anti-rotation groove 902 is a depression corresponding to the anti-rotation protrusion 901 opened from the inner wall of the actuator inner shell 110 in the shell 100. An elastic gasket is also arranged between the buffer 800 and the rotating assembly 710, and the elastic gasket is clamped by the buffer 800 and the rotating assembly 710 on the first axis X1. The buffer 800 has an anti-rotation structure 903, and the anti-rotation structure 903 extends into the actuator assembly 720. The actuator assembly 720 can move relative to the buffer 800 through the anti-rotation structure 903. In this embodiment, the anti-rotation structure 903 extends into the screw rod 721, as shown in FIG. Figure 4 As shown, the actuator 720 is prevented from rotating along with the rotating assembly 710 around the first axis X1 . The anti-rotation structure 903 is an elliptical cylinder into which the buffer member 800 is inserted.

[0050] The actuator assembly of the electronic mechanical brake 1 of this embodiment uses a driving motor 510 to drive the reduction transmission mechanism 600 composed of a planetary gear 614, a ring gear 613, an intermediate wheel 621, and an output wheel 630 to transmit torque, and then drives the ball screw pair composed of a nut 711 and a screw rod 721. The rotation of the nut 711 drives the screw rod 721 to extend and retract to achieve the clamping and release of the inner friction plate 300 and the outer friction plate 400 on the brake disc. The first advantage is that the output wheel 630 of the transmission mechanism 600 is directly connected to the screw rod 721, eliminating the spline connection method conventionally used in the prior art, which can effectively avoid the problem of spline breakage caused by insufficient force on the spline. The second advantage is that the clamping and release can be achieved by extending and retracting the screw rod 721, which can easily achieve the requirement of zero drag. The third advantage is that the drive mechanism 500, the transmission mechanism 600 and the actuator 700 are arranged in the housing 100, which can effectively reduce the axial space without increasing the radial size.

[0051] The electronic mechanical brake actuator assembly, electronic mechanical brake and vehicle disclosed in the present invention have the advantages of shorter axial space, greater clamping force on the brake disc, timely retraction of the screw rod to achieve zero drag when clamping and releasing, more compact overall structure, and low installation cost and assembly difficulty.

[0052] It should be understood that the above description of the specific embodiments of the present invention is only for illustrating the technical route and features of the present invention, and its purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, but the present invention is not limited to the above specific implementation methods. Any changes or modifications made within the scope of the claims of the present invention should be included in the protection scope of the present invention.

Claims

1. An actuator assembly of an electromechanical brake, characterized in that: It comprises a shell and a bracket, wherein the bracket is connected to a first end of the shell, and an inner friction plate arranged close to the shell and an outer friction plate arranged far from the shell are mounted on the bracket; A driving mechanism, a transmission mechanism and an actuator are arranged in the housing, the driving mechanism is arranged side by side on the side of the actuator, the transmission mechanism is connected between the driving mechanism and the actuator and transmits the output of the driving mechanism to the actuator; The actuator comprises a rotating assembly and an actuator assembly, wherein the rotating assembly is rotatably connected to the outside of the actuator assembly and connected to the transmission mechanism, the actuator assembly is connected to the inner friction plate, and the rotating assembly rotates around the first axis driven by the transmission mechanism and drives the actuator assembly to move along the first axis; The actuator assembly includes a screw rod and a baffle, wherein the baffle is fixedly connected to the screw rod and is located between the screw rod and the inner friction plate; The rotating assembly includes a nut, which is sleeved outside the screw rod and rotatably connected to the screw rod; the nut includes a proximal end close to the inner friction plate and a distal end away from the inner friction plate; The transmission mechanism comprises an output wheel, which is sleeved on the proximal end of the nut and fixedly connected to the nut, and the nut is driven to rotate around the first axis by the output wheel, and the nut drives the screw rod to move along the first axis; A buffer is also provided between the housing and the rotating assembly, and the buffer is fixedly connected to the inner wall of the housing; The buffer member is connected to the housing via a rotation-stop assembly; The driving mechanism includes a driving motor and a motor gear, wherein the motor gear is arranged on the driving motor, and the motor gear has a second axis, which is parallel to the first axis. The rotating assembly includes a nut, and the transmission mechanism includes a planetary gear assembly, an intermediate wheel assembly and an output wheel. The planetary gear assembly is connected to the motor gear by tooth surface meshing, and the motor gear and the planetary gear assembly are coaxially arranged on the second axis. The intermediate wheel assembly is connected between the planetary gear assembly and the output wheel, and the output wheel is sleeved outside the nut and is directly fixedly connected to the nut.

2. The electromechanical brake actuator assembly according to claim 1, characterized in that: The shell body has an actuator inner shell, which is cylindrical along the first axis and surrounds a first chamber. The outside of the actuator inner shell is a second chamber. The first chamber and the second chamber are connected at the first end. The actuator is arranged in the first chamber and extends out to the first end. The drive mechanism and the transmission mechanism are arranged in the second chamber.

3. The electromechanical brake actuator assembly according to claim 2, characterized in that: The nut is provided with a stop protrusion, the inner wall of the actuator inner shell is provided with a stop boss, the stop protrusion is located between the stop boss and the output wheel on the first axis, and a gap is provided between the stop protrusion and the stop boss.

4. The electromechanical brake actuator assembly according to claim 3, characterized in that: The nut is provided with a fixing ring, and the output wheel is fixedly connected to the nut through the fixing ring.

5. The electromechanical brake actuator assembly according to claim 3, characterized in that: An anti-wear component is arranged between the nut and the inner actuator shell, and the anti-wear component extends along the first axis.

6. The electromechanical brake actuator assembly according to claim 1, characterized in that: The screw rod and the baffle are fixed by screws, and the screws pass through the baffle plate from the first end along the first axis and extend into and are fixed in the screw rod.

7. The electromechanical brake actuator assembly according to claim 1, characterized in that: The diameter of the baffle is larger than the diameter of the screw rod and smaller than the minimum outer diameter of the inner friction plate relative to the first axis.

8. The electromechanical brake actuator assembly according to claim 1, characterized in that: The planetary gear assembly includes a planet carrier, a planet carrier shaft, a ring gear and a plurality of planetary wheels. The planet carrier is fixed between the drive motor and the housing on the second axis through the planet carrier shaft. The ring gear and the plurality of planetary wheels are rotatably fixed in the planet carrier. The plurality of planetary wheels are meshed with the ring gear through tooth surfaces. The plurality of planetary wheels are connected to the motor gear through tooth surface meshing. The plurality of planetary wheels are arranged around the motor gear, and the outer surface of the planet carrier is a tooth surface.

9. The electromechanical brake actuator assembly according to claim 1, characterized in that: The intermediate wheel assembly includes an intermediate wheel and an intermediate wheel shaft. The intermediate wheel is installed on the housing through the intermediate wheel shaft. The intermediate wheel is connected between the planetary gear assembly and the output wheel. The planetary gear assembly and the intermediate wheel, and the intermediate wheel and the output wheel are all connected by tooth surface meshing.

10. The electromechanical brake actuator assembly according to claim 1, characterized in that: The motor gear extends from the drive motor toward the first end.

11. The electromechanical brake actuator assembly according to claim 1, characterized in that: The anti-rotation assembly includes an anti-rotation protrusion and an anti-rotation groove, wherein the anti-rotation groove extends in the axial direction, and one of the anti-rotation protrusion and the anti-rotation groove is arranged on the buffer component, and the other is arranged on the shell.

12. The electromechanical brake actuator assembly according to claim 11, characterized in that: The buffer has an anti-rotation structure, which extends into the actuator. The actuator can move relative to the buffer through the anti-rotation structure to prevent the actuator from rotating around the first axis along with the rotating assembly.

13. The electromechanical brake actuator assembly according to claim 11, characterized in that: An elastic gasket is further arranged between the buffer component and the rotating assembly, and the elastic gasket is clamped by the buffer component and the rotating assembly on the first axis.

14. An electromechanical brake, characterized in that: Comprising the execution assembly as described in any one of claims 1-13.

15. A vehicle, characterized in that: Comprising the electromechanical brake of claim 14.

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