Electromechanical brake and shell assembly thereof

Abstract

The shell assembly comprises a shell, a transmission assembly and a driving assembly, the shell is provided with an inner cavity, a liquid inlet hole and an air outlet hole, and the inner cavity penetrates through the first end and the second end of the shell in the axial direction parallel to the axis of the shell. The liquid inlet hole and the air outlet hole are higher than the inner cavity in the vertical direction and are respectively communicated with the inner cavity, and the air outlet hole is provided with a deflation valve; the transmission assembly and the driving assembly are connected with each other and are hermetically arranged in the inner cavity, the transmission assembly seals the inner cavity from the first end, the driving assembly seals the inner cavity from the second end, the transmission assembly is provided with a cavity, and the cavity is communicated with the inner cavity; the inner cavity and the cavity are filled with brake fluid through the liquid inlet hole, and after gas in the inner cavity and the cavity is completely exhausted through the gas outlet hole, a deflation valve is inserted into the gas outlet hole to block the gas outlet hole. According to the technical scheme, hydraulic backup is set for the electronic mechanical brake, intervention can be achieved when a mechanical structure loses efficacy, hydraulic pressure is used for meeting the requirement for service braking, and the safety degree of an automobile is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile brakes, in particular to an electronic mechanical brake and a housing assembly thereof. Background Art

[0002] The Electric Mechanical Brake (EMB) is a vehicle component that uses a mechanical structure for driving and parking brakes, and the Electric Parking Brake (EPB) is a vehicle component that uses a hydraulic structure for driving brakes and a mechanical structure for parking brakes. Compared to EPB, EMBs usually do not have a hydraulic structure, which is cost-effective. However, the EMB lacks a hydraulic structure, and its transmission mechanism cannot output a large braking force, which is less safe than EPB.

[0003] The current EMB products are large in size and cannot be placed in a vehicle body environment with a small space. In addition, the EMB is driven by an electric motor, has a large axial distance, and the clamping force provided is not large enough. In the application environment of the whole vehicle project with a full load greater than or equal to 3 tons and a small axial distance, the EMB cannot meet the actual needs. In addition, the lead screw in the EMB adopts a solid design with a small diameter, and the output clamping force is insufficient. When the EMB is working, the piston needs to be pulled back by the deformation of the rubber ring, and the piston return force is small and the return is not timely. Utility Model Content

[0004] One of the purposes of the utility model is to overcome the deficiencies in the prior art and to provide an electronic mechanical brake and a housing assembly thereof in view of the above-mentioned problems existing in the prior art.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] In a first aspect, the utility model provides a housing assembly of an electronic mechanical brake, comprising a housing, a transmission assembly and a drive assembly;

[0007] The shell has an inner cavity, a liquid inlet and an air outlet, the inner cavity passes through the first end and the second end of the shell along an axial direction parallel to the axis of the shell, the liquid inlet and the air outlet are arranged higher than the inner cavity in the vertical direction and are respectively communicated with the inner cavity, and the air outlet is provided with an air release valve;

[0008] The transmission assembly and the drive assembly are connected to each other and are sealed in the inner cavity. The transmission assembly seals the inner cavity from the first end, and the drive assembly seals the inner cavity from the second end. The transmission assembly has a cavity, and the cavity is communicated with the inner cavity.

[0009] The inner cavity and the cavity are filled with brake fluid through the liquid inlet hole, the gas in the inner cavity and the cavity is exhausted through the air outlet hole, and then the air release valve is inserted into the air outlet hole to block the air outlet hole.

[0010] In a preferred embodiment of the present application, the shell further comprises a liquid inlet storage tank and an air outlet storage tank, wherein the liquid inlet storage tank is connected between the liquid inlet hole and the inner cavity, and the air outlet storage tank is connected between the air outlet hole and the inner cavity.

[0011] In a preferred embodiment of the present application, in the vertical direction, the air outlet storage tank is higher than the inner cavity and at least higher than the liquid inlet storage tank.

[0012] In a preferred embodiment of the present application, the shell has an inner wall surrounding the inner cavity, the inner wall of the shell has a first wall segment and a second wall segment, the first wall segment is connected to the first end, the second wall segment is connected to the second end, the first wall segment and the transmission component are in close contact and sliding cooperation with each other, there is a gap between the second wall segment and the transmission component, the gap is connected to the inner cavity, the liquid inlet storage tank and the air outlet storage tank pass through the second wall segment and are connected to the gap.

[0013] In a preferred embodiment of the present application, the liquid inlet storage tank and the gas outlet storage tank also penetrate the first wall section.

[0014] In a preferred embodiment of the present application, the first wall segment is connected to the second wall segment via a third wall segment, and the third wall segment is arranged at an angle to the first wall segment and the second wall segment respectively.

[0015] In a preferred embodiment of the present application, the transmission assembly includes a nut and a screw, the nut is sealed and sleeved in the housing, the screw is sleeved in the nut, the cavity is formed in the screw, the nut seals the cavity from the first end, and the drive assembly extends into the cavity and is connected to the screw through the connecting assembly.

[0016] In a preferred embodiment of the present application, the transmission assembly further comprises an end cover, the nut has a sealing hole, the sealing hole is communicated with the cavity, and the end cover is sealingly connected in the sealing hole.

[0017] In a preferred embodiment of the present application, the end cover is threadedly connected to the sealing hole.

[0018] In a preferred embodiment of the present application, the end cover and the sealing hole are sealed by a first sealing member.

[0019] In a preferred embodiment of the present application, the nut has a hollow mother body and an end wall, the hollow mother body is sleeved on the hollow rod body, the end wall closes the hollow mother body from the first end, and the sealing hole is opened on the end wall.

[0020] In a preferred embodiment of the present application, the lead screw has a hollow rod body and a connecting piece, the hollow rod body surrounds the cavity, the connecting piece is arranged in the cavity and fixed on the hollow rod body, and the drive assembly is connected to the connecting piece.

[0021] In a preferred embodiment of the present application, the connecting member is a partition that separates the cavity, and the partition is provided with at least one through hole, and the through hole is connected to the cavity.

[0022] In a preferred embodiment of the present application, the transmission assembly and the housing are sealed by a second sealing member.

[0023] In a preferred embodiment of the present application, the drive assembly includes a housing and an output shaft, the housing is fixed at the second end, the output shaft extends from the housing and into the cavity to be connected to the transmission assembly, and the output shaft and the housing are sealed by a third seal.

[0024] In a preferred embodiment of the present application, the box body and the shell are sealed by a fourth sealing member.

[0025] In the second aspect, the utility model provides an electronic mechanical brake, comprising a bracket assembly, an actuator and a housing assembly as described in the first aspect, wherein the bracket assembly and the housing assembly are mounted at a first end of the housing, the actuator and the housing assembly are mounted at a second end of the housing, an inner friction plate and an outer friction plate are arranged on the bracket assembly, the inner friction plate is connected to a transmission assembly, the actuator has a motor shaft, and the motor shaft is connected to a drive assembly.

[0026] The electronic mechanical brake and its housing assembly disclosed by the utility model provide a hydraulic backup for the electronic mechanical brake, which can intervene when the mechanical structure of the electronic mechanical brake fails, and use the hydraulic system to meet the requirements of driving braking, thereby improving the safety of the car. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The utility model is described with the help of the following drawings:

[0028] Figure 1 It is a structural stereoscopic schematic diagram of an electronic mechanical brake in an embodiment of the utility model;

[0029] Figure 2It is a structural exploded view of the electronic mechanical brake in the embodiment of the utility model;

[0030] Figure 3 is a cross-sectional schematic diagram of an electronic mechanical brake in an embodiment of the utility model;

[0031] Figure 4 It is a top view schematic diagram of a housing assembly in an electronic mechanical brake in an embodiment of the utility model;

[0032] Figure 5 yes Figure 4 AA section view;

[0033] Figure 6 yes Figure 4 BB cross-section diagram;

[0034] Figure 7 yes Figure 4 CC profile of ;

[0035] Figure 8 yes Figure 5 DD profile diagram;

[0036] Fig. 9 is an end view of the housing assembly of the electronic mechanical brake of the embodiment of the utility model as viewed from the second end;

[0037] Fig.10 yes Fig. 9 EE profile diagram;

[0038] Fig.11 It is a structural schematic diagram of a transmission component in a housing assembly of an electronic mechanical brake in an embodiment of the utility model;

[0039] Fig.12 yes Fig.11 FF cross-section diagram;

[0040] Fig.13 This is a view of the lead screw observed from the first end in the housing assembly of the electronic mechanical brake in the embodiment of the utility model.

[0041] Reference numerals:

[0042] 1-housing assembly; 2-bracket assembly; 3-actuator; 31-motor shaft; 4-inner friction plate; 5-outer friction plate;

[0043] 100-housing; 101-inner cavity; 102-liquid inlet; 103-air outlet; 104-first end; 105-second end; 106-air release valve; 107-liquid inlet reservoir; 108-air outlet reservoir; 110-housing inner wall; 111-first wall section; 112-second wall section; 113-third wall section; 114-spacer; 109-second seal; 200-transmission assembly; 201-cavity; 210-screw; 211-hollow mother body; 212-end wall; 213-sealing hole; 214-first seal; 220-screw; 221-hollow rod body; 222-connecting piece; 223-through hole; 230-end cover; 300-driving assembly; 301-housing; 302-output shaft; 303-third seal; 304-fourth seal. DETAILED DESCRIPTION

[0044] 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.

[0045] 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.

[0046] like Figures 1 to 11 As shown, an embodiment of the utility model discloses an electronic mechanical brake, including a housing assembly 1, a bracket assembly 2, an actuator 3, an inner friction plate 4 and an outer friction plate 5. The housing assembly 1 is installed together with the bracket assembly 2 and the actuator 3, and the inner friction plate 4 and the outer friction plate 5 are arranged on the bracket assembly 2.

[0047] In the electronic mechanical brake of this embodiment, the housing assembly 1 includes a housing 100, a transmission assembly 200 and a drive assembly 300. The housing 100 has an inner cavity 101, a liquid inlet 102 and an air outlet 103, and the housing 100 has a first end 104 and a second end 105 along the axis of the housing 100. The inner cavity 101 penetrates the first end 104 and the second end 105 of the housing 100 along an axial direction parallel to the axis of the housing 100, the liquid inlet 102 and the air outlet 103 are arranged higher than the inner cavity 101 in the vertical direction and are respectively connected to the inner cavity 101, and the air outlet 103 is provided with an air release valve 106. The transmission assembly 200 and the drive assembly 300 are connected to each other and are sealed in the inner cavity 101. The transmission assembly 200 seals the inner cavity 101 from the first end 104, and the drive assembly 300 seals the inner cavity 101 from the second end 105. The transmission assembly 200 has a cavity 201, and the cavity 201 is connected with the inner cavity 101. The brake fluid is filled into the inner cavity 101 and the cavity 201 through the liquid inlet 102, and the gas in the inner cavity 101 and the cavity 201 is completely discharged through the air outlet 103, and then the air release valve 106 is inserted into the air outlet 103 to block the air outlet 103, and the air release valve 106 is threadedly connected to the air outlet 103. The bracket assembly 2 and the housing assembly 1 are mounted at the first end 104 of the housing 100, the actuator 3 and the housing assembly 1 are mounted at the second end 105 of the housing 100, the inner friction plate 4 is connected to the transmission assembly 200, the actuator 3 has a motor shaft 31, and the motor shaft 31 is connected to the drive assembly 300. The motor shaft 31 controls the drive assembly 300 to drive the transmission assembly 200 to push the inner friction plate 4 to move toward the outer friction plate 5 to achieve braking.

[0048] Thus, the oil inlet hole 102, the inner cavity 101, the cavity 201, the air outlet 103 and the air release valve 106 form a hydraulic backup system enclosed in the housing 100. When the mechanical structure of the electronic mechanical brake operates normally, the hydraulic backup system will not start. Once the mechanical structure of the electronic mechanical brake fails, the hydraulic backup system will intervene in the control, and brake fluid is added to the inner cavity 101 through the oil inlet hole 102. The volume of the brake fluid in the cavity 201 increases, so that the transmission component 200 can push the inner friction plate 4 toward the outer friction plate 5 to press the brake disc to achieve braking. The brake fluid flows back from the inner cavity 101 through the oil inlet hole 102, and the volume of the brake fluid in the cavity 201 decreases, so that the transmission component 200 can pull the inner friction plate 4 away from the outer friction plate 5 to release the brake disc to end braking.

[0049] In this embodiment, the housing 100 further has a liquid inlet reservoir 107 and an air outlet reservoir 108, wherein the liquid inlet reservoir 107 is connected between the liquid inlet hole 102 and the inner cavity 101, and the air outlet reservoir 108 is connected between the air outlet hole 103 and the inner cavity 101. When the oil inlet hole 102 and the air outlet hole 103 are machined, burrs usually remain due to the limitation of the machining process, and these burrs are easy to cut the internal parts of the housing 100 after assembly. Therefore, designing the liquid inlet reservoir 107 and the air outlet reservoir 108 at the oil inlet hole 102 and the air outlet hole 103 respectively can avoid direct contact between the burrs and the internal parts, thereby protecting the internal parts.

[0050] In this embodiment, in the vertical direction, the gas outlet reservoir 108 is higher than the inner cavity 101 and at least higher than the liquid inlet reservoir 107. Among them, the relationship between the axial direction and the vertical direction is that they are not parallel to each other, and there is at least a significant angle between the two directions, such as 30°, 60°, etc. Of course, the best implementation of this embodiment is that the axial direction and the vertical direction are perpendicular to each other. The gas outlet reservoir 108 is located at a higher position than the inner cavity 101 and the liquid inlet reservoir 107. In the best implementation of this embodiment, the gas outlet reservoir 108 is located at the highest position of the shell 100, which can keep the gas at the highest position at all times, which is convenient for exhaust.

[0051] In this embodiment, the housing 100 has a housing inner wall 110 , the transmission assembly 200 includes a nut 210 , a lead screw 220 and an end cover 230 , and the drive assembly 300 includes a housing 301 and an output shaft 302 .

[0052] In the housing 100, the housing inner wall 110 surrounds the inner cavity 101, and the housing inner wall 110 has a first wall section 111, a second wall section 112 and a third wall section 113. The first wall section 111 is connected to the first end 104, the second wall section 112 is connected to the second end 105, the first wall section 111 and the second wall section 112 are connected through the third wall section 113, and the third wall section 113 is respectively arranged at an angle with the first wall section 111 and the second wall section 112. The first wall section 111 and the transmission assembly 200 are mutually fitted and slidably matched, and there is a gap 114 between the second wall section 112 and the transmission assembly 200, and the gap 114 is connected to the inner cavity 101, and the liquid inlet storage tank 107 and the gas outlet storage tank 108 pass through the first wall section 111 and the second wall section 112 and are connected to the gap 114. Among them, the liquid inlet reservoir 107 and the air outlet reservoir 108 are designed to penetrate the first wall section 111 and the second wall section 112 because if only the liquid inlet reservoir 107 is arranged in the first wall section 111, the gap between the first wall section 111 and the transmission assembly 200 is particularly small, and the flow of brake fluid will be hindered. When the hydraulic backup system is started to fill the inner cavity 101 with brake fluid to pressurize the cavity 201, timely feedback may not be obtained. Therefore, the liquid inlet reservoir 107 needs to penetrate the second wall section 112; if only the air outlet reservoir 108 is arranged in the first wall section 111, it seems that the air outlet reservoir 108 is located at the highest position of the shell 100, but due to the existence of the third wall section 113, the bubbles in the second wall section 112 will be blocked, resulting in unclean exhaust and affecting the braking effect of the hydraulic backup system. Therefore, the air outlet reservoir 108 needs to penetrate the second wall section 112. Of course, it is also possible to arrange the liquid inlet reservoir 107 and the gas outlet reservoir 108 only in the second wall section 112, but due to the thickness of the inner wall 110 of the housing 100, it is difficult to arrange them in terms of technology, which will increase the assembly cost. The third wall section 113 can be designed as a slope shape, or any other shape that can make the first wall section 111 and the second wall section 112 have an inner diameter difference, such as a step shape, which not only ensures the size matching between the transmission assembly 200 and the inner wall 110 of the housing, but also ensures the fluidity of the brake fluid.

[0053] In the transmission assembly 200, the nut 210 is sealed and sleeved in the housing 100, the lead screw 220 is sleeved in the nut 210, a cavity 201 is formed in the lead screw 220, the cavity 201 axially penetrates the lead screw 220, and the nut 210 seals the cavity 201 from the first end 104. The nut 210 has a hollow body 211, an end wall 212 and a sealing hole 213, and the lead screw 220 has a hollow rod body 221 and a connecting piece 222.

[0054] The hollow body 211 is a hollow tubular structure, and the hollow body 211 is sleeved on the outside of the hollow rod body 221 of the lead screw 220. The end wall 212 is a structure extending from the end of the hollow body 211 toward the center of the end of the hollow body 211, and the end wall 212 closes the hollow body 211 from the first end 104. The sealing hole 213 is opened on the end wall 212 and communicates with the cavity 201, and the end cover 230 is sealed in the sealing hole 213. Among them, the end cover 230 is threadedly connected to the sealing hole 213, and the end cover 230 and the sealing hole 213 are sealed by the first sealing member 214. The threaded connection between the end cover 230 and the sealing hole 213 and the first sealing member 214 provide a sealing effect together. After the housing assembly 1 is assembled, the end cover 230 can completely seal the sealing hole 213.

[0055] The hollow bar body 221 is a hollow tubular structure, and the hollow bar body 221 surrounds and forms a cavity 201. The connecting piece 222 is arranged in the cavity 201 and fixed on the hollow bar body 221. The connecting piece 222 is connected to a part of the inner wall of the hollow bar body 221, and the shape can be determined as any desired shape according to actual needs. The driving component 300 is connected to the connecting piece 222. In the driving component 300, only the output shaft 302 can extend into the cavity 201, and the hollow bar body 221 will not be sleeved outside the box body 301, or the output shaft 302 and the box body 301 can extend into the cavity 201 together, and the hollow bar body 221 is sleeved outside the box body 301.

[0056] The connecting member 222 is a partition that separates the cavity 201, and at least one through hole 223 is provided on the partition, and the through hole 223 is connected to the cavity 201. In other words, the connecting member 222 is a partition whose outer contour is the same as the inner contour of the hollow bar body 221, and the partition divides the cavity 201 into two parts. The through hole 223 is provided to ensure the circulation of the brake fluid in the cavity 201. The number of the through holes 223 can be set according to actual needs. In one implementation of this embodiment, the number of the through holes 223 is set to six and evenly arranged.

[0057] The transmission assembly 200 and the housing 100 are sealed by a second seal 109. The second seal 109 is arranged on the first wall section 111 and seals the transmission assembly 200 to prevent the brake fluid in the inner cavity 101 from leaking out and to prevent external liquid from entering the inner cavity 101. At the same time, it provides a damping effect so that the transmission assembly 200 and the inner wall 110 of the housing will not directly collide with each other and generate huge noise.

[0058] In the drive assembly 300, the housing 301 is fixed at the second end 105, the output shaft 302 extends from the housing 301 and extends into the cavity 201 to connect with the connecting piece 222 of the lead screw 220 in the transmission assembly 200, and the output shaft 302 and the housing 301 are sealed by a third seal 303, and the third seal 303 is used to prevent the brake fluid in the inner cavity 101 from entering the housing 301. The housing 301 and the shell 100 are sealed by a fourth seal 304, and the fourth seal 304 is located at the bottom 130 of the shell to prevent the brake fluid from flowing out of the inner cavity 101, resulting in failure of the hydraulic backup. Among them, the drive assembly 300 can reduce speed and increase torque, the motor shaft 31 of the actuator 3 inputs torque to the drive assembly 300, and the output shaft 302 meshes with the connecting piece 222 of the lead screw 220, and outputs torque to the lead screw 220.

[0059] The liquid inlet hole 102 and the air outlet hole 103 cooperate with the first seal 214, the second seal 109, the third seal 303 and the fourth seal 304 to completely seal the inner cavity 101. The liquid inlet reservoir 107 and the air outlet reservoir 108 are respectively arranged at the liquid inlet hole 102 and the air outlet hole 103 to facilitate the entry of the brake fluid and prevent the burrs generated when machining the liquid inlet hole 102 and the air outlet hole 103 from directly contacting the transmission component 200 and the drive component 300 to cause cutting of the internal parts. The air outlet hole 103 is arranged higher than the liquid inlet hole 102, so that the gas is always at the highest position, which is convenient for exhaust.

[0060] In this embodiment, the transmission assembly 200 is a ball screw structure, which controls the extension and retraction of the nut 210 by converting torque into axial force through the forward and reverse rotation of the motor shaft 31.

[0061] In this embodiment, the first sealing member 214 , the third sealing member 303 and the fourth sealing member 304 are O-rings, and the second sealing member 109 is a rectangular sealing ring.

[0062] In this embodiment, the axes of the motor shaft 31 of the actuator 3, the output shaft 302, the housing 100, the lead screw 220 and the nut 210 of the transmission assembly 200 are arranged in a coaxial structure.

[0063] The electronic mechanical brake and its housing assembly disclosed by the utility model provide a hydraulic backup for the electronic mechanical brake, which can intervene when the mechanical structure of the electronic mechanical brake fails, and use the hydraulic system to meet the requirements of driving braking, thereby improving the safety of the car.

[0064] It should be understood that the above description of the specific embodiments of the utility model is only for illustrating the technical route and features of the utility model, and its purpose is to enable those skilled in the art to understand the content of the utility model and implement it accordingly, but the utility model is not limited to the above specific implementation methods. All changes or modifications made within the scope of the claims of the utility model should be included in the protection scope of the utility model.

Claims

1. A housing assembly for an electronic mechanical brake, characterized in that: It includes a housing, a transmission assembly and a drive assembly; The shell has an inner cavity, a liquid inlet and an air outlet, the inner cavity passes through the first end and the second end of the shell along an axial direction parallel to the axis of the shell, the liquid inlet and the air outlet are arranged higher than the inner cavity in the vertical direction and are respectively communicated with the inner cavity, and the air outlet is provided with an air release valve; The transmission assembly and the drive assembly are connected to each other and are sealed in the inner cavity. The transmission assembly seals the inner cavity from the first end, and the drive assembly seals the inner cavity from the second end. The transmission assembly has a cavity, and the cavity is communicated with the inner cavity. The inner cavity and the cavity are filled with brake fluid through the liquid inlet hole, the gas in the inner cavity and the cavity is exhausted through the air outlet hole, and then the air release valve is inserted into the air outlet hole to block the air outlet hole.

2. The housing assembly of the electromechanical brake according to claim 1, characterized in that: The shell also has a liquid inlet storage tank and an air outlet storage tank. The liquid inlet storage tank is connected between the liquid inlet hole and the inner cavity, and the air outlet storage tank is connected between the air outlet hole and the inner cavity.

3. The housing assembly of the electromechanical brake according to claim 2, characterized in that: In the vertical direction, the air outlet storage tank is higher than the inner cavity and at least higher than the liquid inlet storage tank.

4. The housing assembly of the electromechanical brake according to claim 2, characterized in that: The shell has an inner wall surrounding the inner cavity, and the inner wall has a first wall section and a second wall section, the first wall section is connected to the first end, and the second wall section is connected to the second end, the first wall section and the transmission component are in close contact and slidable cooperation with each other, there is a gap between the second wall section and the transmission component, the gap is connected to the inner cavity, and the liquid inlet storage tank and the air outlet storage tank pass through the second wall section and are connected to the gap.

5. The housing assembly of the electromechanical brake according to claim 4, characterized in that: The liquid inlet storage tank and the gas outlet storage tank also penetrate the first wall section.

6. The housing assembly of the electromechanical brake according to claim 4, characterized in that: The first wall segment is connected to the second wall segment via a third wall segment, and the third wall segment is arranged at an angle to the first wall segment and the second wall segment respectively.

7. The housing assembly of the electromechanical brake according to claim 1, characterized in that: The transmission assembly includes a nut and a lead screw. The nut is sealed and sleeved in the housing. The lead screw is sleeved in the nut. The cavity is formed in the lead screw. The cavity passes through the lead screw along the axial direction. The nut seals the cavity from the first end.

8. The housing assembly of the electromechanical brake according to claim 7, characterized in that: The transmission assembly further includes an end cover, the nut has a sealing hole, the sealing hole is communicated with the cavity, and the end cover is sealingly connected in the sealing hole.

9. The housing assembly of the electromechanical brake according to claim 8, characterized in that: The end cover is threadedly connected to the sealing hole.

10. The housing assembly of the electromechanical brake according to claim 8, characterized in that: The end cover and the sealing hole are sealed by a first sealing member.

11. The housing assembly of the electromechanical brake according to claim 8, characterized in that: The nut has a hollow body and an end wall. The hollow body is sleeved outside the lead screw. The end wall seals the hollow body from the first end. The sealing hole is opened on the end wall.

12. The housing assembly of the electromechanical brake according to claim 7, characterized in that: The lead screw comprises a hollow rod body and a connecting piece, wherein the hollow rod body surrounds the cavity, the connecting piece is arranged in the cavity and fixed on the hollow rod body, and the driving assembly is connected to the connecting piece.

13. The housing assembly of the electromechanical brake according to claim 12, characterized in that: The connecting member is a partition that separates the cavity. The partition is provided with at least one through hole, and the through hole is connected to the cavity.

14. The housing assembly of the electromechanical brake according to claim 1, characterized in that: The transmission assembly and the housing are sealed by a second sealing member.

15. The housing assembly of the electromechanical brake according to claim 1, characterized in that: The driving assembly includes a housing and an output shaft. The housing is fixed at the second end. The output shaft extends from the housing and into the cavity to be connected with the transmission assembly. The output shaft and the housing are sealed by a third sealing member.

16. The housing assembly of the electromechanical brake according to claim 15, characterized in that: The box body and the shell are sealed by a fourth sealing member.

17. An electromechanical brake, characterized in that: It comprises a bracket assembly, an actuator and a housing assembly as claimed in any one of claims 1 to 16, wherein the bracket assembly and the housing assembly are mounted at a first end of the housing, the actuator and the housing assembly are mounted at a second end of the housing, an inner friction plate and an outer friction plate are arranged on the bracket assembly, the inner friction plate is connected to a transmission assembly, the actuator has a motor shaft, and the motor shaft is connected to a drive assembly.

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