An electromechanical brake with a venting device

Abstract

This invention discloses an electromechanical brake with a venting device, comprising an actuator assembly, which includes a motor reduction housing, an ECU housing, and an ECU cover. The front end of the ECU housing is sealed to the ECU cover with adhesive, and the back end of the ECU housing is fixedly connected to the motor reduction housing, with a sealed connection between the back end of the ECU housing and one end of the motor reduction housing. The other end of the motor reduction housing is fixedly connected to one end of the clamp body, and the other end of the motor reduction housing is sealed to one end of a piston cylinder on the clamp body at its output end. A dustproof sealing element is provided at the other end of the piston cylinder. A venting device is installed on the back of the ECU housing, located in the gap between the ECU housing and the motor reduction housing. This venting device ensures the balance of internal and external air pressure in the electromechanical brake, thereby preventing excessive air pressure in the internal cavity of the electromechanical brake from damaging its sealing structure.

Description

Technical Field

[0001] This invention belongs to the field of braking system technology, and specifically relates to an electromechanical brake with a venting device. Background Technology

[0002] With the deepening of the automotive electrification transformation, brake-by-wire systems have gradually become an important development direction in the industry. Electro-Mechanical Braking (EMB) systems, as a typical implementation of brake-by-wire systems, have received widespread attention. This system uses a wheel-end motor for direct drive, converting the motor's torque and rotational motion into linear motion of a translational component through a motion conversion mechanism. This, in turn, pushes the brake pads to clamp the brake disc, generating braking force. Compared to traditional hydraulic or pneumatic braking systems, electro-mechanical braking systems eliminate complex hydraulic lines and actuators, offering advantages such as simple structural layout, fast response speed, and high transmission efficiency.

[0003] As a highly integrated new type of braking system, the electromechanical braking system integrates the control unit onto the traditional wheel-end caliper, thus forming a highly integrated electromechanical brake. Because the control unit is directly located at the wheel end, its operating environment is relatively harsh, placing more stringent requirements on the control unit's vibration resistance, high and low temperature resistance, and waterproof and dustproof performance. At the same time, under prolonged or frequent braking conditions, the power devices in the control unit will generate a large amount of heat. Due to the relatively enclosed internal space of the electromechanical brake, the heat accumulation will cause a sharp increase in the internal air pressure.

[0004] In existing technologies, electromechanical brakes typically focus only on their braking function and structural strength, without fully considering the impact of internal air pressure changes. Specifically, current electromechanical brakes lack a design to balance internal and external air pressure. When the internal air pressure increases significantly due to prolonged braking, the brake's seals will be subjected to the expansion force of the gas. Over time, this can easily lead to seal failure or even structural damage, thus affecting the reliability, durability, and safety of the electromechanical brake.

[0005] Therefore, how to effectively solve the risk of seal failure caused by increased internal air pressure while ensuring the advantages of integrated electromechanical brakes is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0006] In view of the above-mentioned defects of the prior art, the present invention provides an electromechanical brake with a venting device. By setting the venting device, the internal and external air pressure balance of the electromechanical brake can be ensured, thereby avoiding excessive air pressure in the internal cavity of the electromechanical brake and damage to the sealing structure of the electromechanical brake.

[0007] The technical solution adopted by this invention to solve its technical problem is:

[0008] An electromechanical brake with a venting device includes a mounting bracket, a clamp body, and an actuator assembly. The actuator assembly includes a motor reduction gear and an electronic control device. The motor reduction gear includes a motor reduction housing, and the electronic control device includes an ECU housing and an ECU cover.

[0009] The front end of the ECU housing is sealed and fixedly connected to the ECU housing cover with adhesive. The back end of the ECU housing is fixedly connected to the motor reduction housing, and the back end of the ECU housing is sealed to one end of the motor reduction housing. The other end of the motor reduction housing is fixedly connected to one end of the clamp body, and the other end of the motor reduction housing is sealed to one end of the piston cylinder on the clamp body on the output end side. A sealing dustproof component is provided at the other end of the piston cylinder to seal between the piston cylinder and the piston disposed in the piston cylinder. A venting device is installed on the back of the ECU housing, and the venting device is located in the gap between the ECU housing and the motor reduction housing.

[0010] Furthermore, the back plate of the ECU housing has a venting device mounting hole, and the venting device is installed at the venting device mounting hole.

[0011] Furthermore, the ventilation device is a ventilation valve, which is inserted into the ventilation device mounting hole, and the ventilation valve is sealed to the ventilation device mounting hole.

[0012] Furthermore, the mounting hole of the venting device is conical.

[0013] Furthermore, the breathable device is a breathable membrane.

[0014] Furthermore, on the back plate of the ECU housing, a protective wall for the venting device is fixed around the edge of the venting device mounting hole, extending and protruding towards one side of the motor reduction housing, and the venting device is located within the space enclosed by the protective wall for the venting device.

[0015] Furthermore, the protective wall of the venting device is integrally connected to the back plate of the ECU housing, and the protective wall of the venting device is cylindrical.

[0016] Furthermore, a sealing detection hole is provided on the outer wall of the piston cylinder. The sealing detection hole is used to fill the inner cavity of the electromechanical brake with detection gas. When the electromechanical brake is in a sealing detection condition, the free end of the protective wall of the venting device is used for sealing.

[0017] Furthermore, the sealing detection hole is a threaded hole, and when the electromechanical brake is in braking condition, a bolt is screwed into the threaded hole.

[0018] Furthermore, the back end of the ECU housing is sealed to one end of the motor reduction housing by a sealing ring, and the other end of the motor reduction housing is sealed to one end of the piston cylinder on the clamp body by a sealing ring on the output end side.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] The electromechanical brake with a venting device in this invention has a venting device installed on the back of the ECU housing. This venting device allows the gas inside the electromechanical brake to expand due to heat and be discharged outwards through the venting device during prolonged or frequent braking operations, thus ensuring a balance of internal and external air pressure. This prevents excessive air pressure inside the electromechanical brake from damaging its sealing structure. Since the venting device is located in the gap between the ECU housing and the motor reduction housing, it is well protected in the narrow gap after the ECU housing and motor reduction housing are fixedly connected. The venting device cannot be removed without disassembling the motor reduction housing. Therefore, by installing the venting device on the back of the ECU housing and placing it in the gap between the ECU housing and the motor reduction housing, damage to the venting device due to external forces or intentional disassembly can be prevented.

[0021] In this invention, the venting device is a vent valve, which is inserted into the venting device mounting hole, and the vent valve and the venting device mounting hole are sealed together. A protective wall for the venting device, extending towards one side of the motor reduction housing, is fixed to the back plate of the ECU housing around the edge of the venting device mounting hole. The venting device is located within the space enclosed by the protective wall. This protective wall provides protection for the vent valve operating at the wheel end of the vehicle, preventing it from being weakened or rendered ineffective by rain, snow, mud, etc. Furthermore, in the vehicle's orientation, the axis of the vent valve is nearly parallel to the ground. Water accumulated at the vent valve will be discharged outwards along the protective wall due to its own weight, preventing water from accumulating at the vent valve and thus ensuring that the venting function of the vent valve remains unaffected.

[0022] In this invention, a sealing detection hole is provided on the outer wall of the piston cylinder. This hole is used to fill the inner cavity of the electromechanical brake with detection gas. When the electromechanical brake is in sealing detection mode, the free end of the protective wall of the venting device is used for sealing. Thus, when the electromechanical brake is in sealing detection mode, by sealing the free end of the protective wall of the venting device and filling the inner cavity of the electromechanical brake with detection gas through the sealing detection hole, the sealing performance of all sealing areas in the electromechanical brake, except for the location of the venting device, can be detected. Specifically, the sealing performance between the front end of the ECU housing and the ECU cover can be detected, as can the sealing performance between the back end of the ECU housing and one end of the motor reduction housing, the sealing performance between the other end of the motor reduction housing on the output side and one end of the piston cylinder on the clamp body, and the sealing performance of the dustproof sealing component at the other end of the piston cylinder can be detected. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of the electromechanical brake with a venting device in this invention;

[0024] Figure 2 for Figure 1 A schematic diagram of the three-dimensional structure from another direction;

[0025] Figure 3 This is an exploded view of the electromechanical brake with a venting device in this invention;

[0026] Figure 4 An exploded view of the actuator assembly;

[0027] Figure 5 This is a three-dimensional structural diagram of the ECU housing.

[0028] The following are the reference numerals in the diagram: 1. Mounting bracket; 2. Clamp body; 201. Piston cylinder; 202. Bolt; 3. Actuator assembly; 301. Motor reduction housing; 302. ECU housing; 30201. Vent device mounting hole; 303. ECU housing cover; 304. Vent valve; 305. Vent device protective wall; 306. Sealing ring; 307. ECU housing screw; 308. Controller function circuit board; 309. Circuit board screw. Detailed Implementation

[0029] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. These embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0030] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0032] Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0033] like Figures 1-3 As shown, an electromechanical brake with a venting device includes a mounting bracket 1, a clamp body 2, and an actuator assembly 3. The actuator assembly 3 includes a motor reduction device and an electronic control device. The motor reduction device includes a motor reduction housing 301, and the electronic control device includes an ECU housing 302 and an ECU cover 303.

[0034] The front end of the ECU housing 302 is sealed and fixedly connected to the ECU housing cover 303 with adhesive. The back end of the ECU housing 302 is fixedly connected to the motor reduction housing 301, and a sealed connection is made between the back end of the ECU housing 302 and one end of the motor reduction housing 301. The other end of the motor reduction housing 301 is fixedly connected to one end of the clamp body 2, and a sealed connection is made between the other end of the motor reduction housing 301 and one end of the piston cylinder 201 on the clamp body 2 on the output end side. A sealing dustproof component is provided at the other end of the piston cylinder 201 to seal between the piston cylinder 201 and the piston disposed within the piston cylinder 201. Figure 1 , Figure 4 and Figure 5 As shown, a venting device is installed on the back of the ECU housing 302, and the venting device is located in the gap between the ECU housing 302 and the motor reduction housing 301. Figure 1 .

[0035] Because a venting device is installed on the back of the ECU housing 302, when the electromechanical brake is under prolonged or frequent braking conditions, the gas inside the electromechanical brake expands due to heat and is discharged outward through the venting device. This ensures the balance of internal and external air pressure in the electromechanical brake, thus preventing excessive air pressure in the electromechanical brake cavity from damaging the brake's sealing structure. Specifically, it prevents the sealant between the front end of the ECU housing 302 and the ECU cover 303 from being subjected to continuous pressure and malfunctioning, and it prevents the sealing structure, such as the sealing ring, between the back end of the ECU housing 302 and one end of the motor reduction housing 301 from being subjected to continuous pressure and malfunctioning. Furthermore, it prevents the piston on the clamp body 2 at the other end of the motor reduction housing 301 from being subjected to continuous pressure. The sealing structure between one end of cylinder 201, such as the sealing ring, will fail due to continuous pressure, and the sealing dustproof component at the other end of piston cylinder 201 will also fail due to continuous pressure. Since the venting device is located in the gap between ECU housing 302 and motor reduction housing 301, the venting device can be well protected in the narrow gap between ECU housing 302 and motor reduction housing 301 after the ECU housing 302 and motor reduction housing 301 are fixedly connected. The venting device cannot be disassembled without disassembling the motor reduction housing 301. Therefore, by installing the venting device on the back of ECU housing 302 and placing it in the gap between ECU housing 302 and motor reduction housing 301, damage to the venting device due to external forces or human disassembly can be prevented.

[0036] Among them, such as Figure 5 As shown, the ECU housing 302 has a venting device mounting hole 30201 on its back plate, and the venting device is installed at the venting device mounting hole 30201.

[0037] In one embodiment, such as Figure 1 , Figure 4 and Figure 5 As shown, the ventilation device is a ventilation valve 304, which is inserted into the ventilation device mounting hole 30201 and is sealed to the ventilation device mounting hole 30201. A breathable membrane is provided on the ventilation valve 304, which has waterproof and breathable functions. The ventilation valve 304 and the ventilation device mounting hole 30201 are sealed together by a sealing ring. The ventilation device mounting hole 30201 is conical and adapts to the ventilation valve 304. The ventilation valve 304 can be installed manually by pressing or automatically by the equipment. Alternatively, the ventilation device can be a breathable membrane, which also has waterproof and breathable functions.

[0038] Among them, such as Figure 1 and Figure 5As shown, on the back plate of the ECU housing 302, a venting device protective wall 305 extending and protruding to one side of the motor reduction housing 301 is fixed around the edge of the venting device mounting hole 30201. The venting device is located within the space enclosed by the venting device protective wall 305.

[0039] When the venting device is a vent valve 304, the protective wall 305 of the venting device can provide a certain degree of protection for the vent valve 304, which works at the wheel end of the vehicle. This can prevent the vent valve 304 from being affected by rain, snow, mud, etc., which could weaken or cause it to fail. In addition, in the overall vehicle layout direction, the axis of the vent valve 304 is nearly parallel to the ground. Water accumulated at the vent valve 304 will be discharged outward along the protective wall 305 of the venting device due to its own weight. Water is not easy to accumulate at the vent valve 304, thus ensuring that the venting function of the vent valve 304 is not affected.

[0040] When the ventilation device is a breathable membrane, the protective wall 305 of the ventilation device can provide a certain degree of protection for the breathable membrane working at the wheel end of the car. It can prevent the breathable membrane from being affected by rain, snow, mud, etc., which would weaken or fail the breathability function. In addition, in the overall vehicle layout direction, the center line of the breathable membrane is almost parallel to the ground. Water accumulated at the breathable membrane will be discharged outward along the protective wall 305 of the ventilation device due to its own weight. Water is not easy to accumulate at the breathable membrane, thus ensuring that the breathability function of the breathable membrane is not affected.

[0041] In one preferred embodiment, the venting device protective wall 305 is integrally connected to the back plate of the ECU housing 302, and the venting device protective wall 305 is cylindrical.

[0042] In another preferred embodiment, a sealing detection hole is provided on the outer wall of the piston cylinder 201. The sealing detection hole is used to fill the inner cavity of the electromechanical brake with detection gas. When the electromechanical brake is in the sealing detection condition, the free end of the venting device protective wall 305 is used for sealing.

[0043] In this way, when the electromechanical brake is under sealing test conditions, by sealing the free end of the venting device protective wall 305 and filling the inner cavity of the electromechanical brake with test gas through the sealing test hole, the sealing performance of each sealing area in the electromechanical brake, except for the location of the venting device, can be tested. Specifically, the sealing performance between the front end of the ECU housing 302 and the ECU housing cover 303 can be tested, as can the sealing performance between the back end of the ECU housing 302 and one end of the motor reduction housing 301 can be tested, as can the sealing performance between the other end of the motor reduction housing 301 on the output end side and one end of the piston cylinder 201 on the clamp body 2 can be tested, and the sealing performance of the sealing dustproof component at the other end of the piston cylinder 201 can also be tested.

[0044] More preferably, the sealing detection hole is a threaded hole, and when the electromechanical brake is in braking condition, a bolt 202 is screwed into the threaded hole, see... Figure 2 .

[0045] After the electromechanical brake is tested for sealing, the sealing test hole is sealed by screwing bolt 202 onto the sealing test hole.

[0046] In one embodiment, the back end of the ECU housing 302 and one end of the motor reduction housing 301 are sealed together by a first sealing ring 306. Figure 4 The other end of the motor reduction housing 301 is sealed to one end of the piston cylinder 201 on the clamp body 2 via a second sealing ring on the output end side.

[0047] In this invention, the controller function circuit board 308 fixed inside the ECU housing 302 is coated with conformal coating to prevent moisture from entering the ECU housing 302 and affecting the function of the controller function circuit board 308. The controller function circuit board 308 is fixed inside the ECU housing 302 by circuit board screws 309, see... Figure 4 .

[0048] In this invention, the motor reduction device also includes a motor and a gear transmission mechanism. The output shaft of the motor is connected to the input end of the gear transmission mechanism, and the output end of the gear transmission mechanism is connected to the piston in the piston cylinder 201 through a motion conversion mechanism.

[0049] In this invention, the back end of the ECU housing 302 is fixedly connected to the motor reduction housing 301 by ECU housing screws 307, see... Figure 4 The other end of the motor reduction housing 301 is fixedly connected to one end of the clamp body 2 by screws.

[0050] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. An electromechanical brake with a venting device, comprising a mounting bracket (1), a clamp body (2), and an actuator assembly (3), wherein the actuator assembly (3) includes a motor reduction gear and an electronic control device, the motor reduction gear includes a motor reduction housing (301), and the electronic control device includes an ECU housing (302) and an ECU cover (303); characterized in that: The front end of the ECU housing (302) is sealed and fixedly connected to the ECU housing cover (303) with adhesive. The back end of the ECU housing (302) is fixedly connected to the motor reduction housing (301), and the back end of the ECU housing (302) is sealed to one end of the motor reduction housing (301). The other end of the motor reduction housing (301) is fixedly connected to one end of the clamp body (2), and the other end of the motor reduction housing (301) is sealed to one end of the piston cylinder (201) on the output end side. A sealing dustproof component is provided at the other end of the piston cylinder (201) for sealing between the piston cylinder (201) and the piston set in the piston cylinder (201). A venting device is installed on the back of the ECU housing (302), and the venting device is located in the gap between the ECU housing (302) and the motor reduction housing (301).

2. The electromechanical brake with a ventilating device according to claim 1, characterized in that: The ECU housing (302) has a ventilation device mounting hole (30201) on its back plate, and the ventilation device is installed at the ventilation device mounting hole (30201).

3. An electromechanical brake with a ventilating device according to claim 2, characterized in that: The ventilation device is a ventilation valve (304), which is inserted into the ventilation device mounting hole (30201) and is sealed to the ventilation device mounting hole (30201).

4. An electromechanical brake with a ventilating device according to claim 3, characterized in that: The mounting hole (30201) of the ventilation device is conical.

5. An electromechanical brake with a ventilating device according to claim 2, characterized in that: The breathable device is a breathable membrane.

6. An electromechanical brake with a ventilating device according to claim 3 or 5, characterized in that: On the back plate of the ECU housing (302), a protective wall (305) for a vent device is fixed around the edge of the vent device mounting hole (30201) and extends to one side of the motor reduction housing (301). The vent device is located within the space enclosed by the protective wall (305).

7. An electromechanical brake with a ventilating device according to claim 6, characterized in that: The protective wall (305) of the ventilator is integrally connected to the back plate of the ECU housing (302), and the protective wall (305) of the ventilator is cylindrical.

8. An electromechanical brake with a ventilating device according to claim 6, characterized in that: A sealing detection hole is provided on the outer wall of the piston cylinder (201). The sealing detection hole is used to fill the inner cavity of the electromechanical brake with detection gas. When the electromechanical brake is in a sealing detection condition, the free end of the protective wall (305) of the venting device is used for sealing.

9. An electromechanical brake with a ventilating device according to claim 8, characterized in that: The sealing detection hole is a threaded hole. When the electromechanical brake is in braking condition, a bolt (202) is screwed into the threaded hole.

10. An electromechanical brake with a ventilating device according to claim 2, characterized in that: The back end of the ECU housing (302) is sealed to one end of the motor reduction housing (301) by a sealing ring, and the other end of the motor reduction housing (301) is sealed to one end of the piston cylinder (201) on the clamp body (2) by a sealing ring on the output end side.

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