Electric disc brake with parking function

Abstract

The utility model provides a kind of electric disc brake with parking function belongs to brake technical field.It solves the problems such as insufficient reliability of existing brake.The electric disc brake with parking function, including caliper body, brake pad, brake motor and circuit board, brake motor includes motor shell, stator and rotor, motor shell is fixedly connected on the rear end of caliper body, brake transmission mechanism is arranged between rotor and brake pad, motor shell has the connecting wall that is cylindrical in it, motor shell also has the mounting wall located at the peripheral side of connecting wall, stator is fixedly connected in connecting wall, intermediate seat is fixedly connected on connecting wall and located at the rear of stator, end cover is fixedly connected on mounting wall and located at the rear of intermediate seat, circuit board is fixedly connected on mounting wall and located between intermediate seat and end cover, and circuit board is spaced apart from intermediate seat.This brake can reduce the influence of brake motor heat on circuit board, avoid circuit board overheating, and improve the reliability of brake.

Description

Technical Field

[0001] This utility model belongs to the field of brake technology and relates to an electric disc brake with parking function. Background Technology

[0002] A braking system is a system that forcibly reduces the speed of a moving device. In vehicles, braking is typically achieved through brakes, including disc brakes and drum brakes. Brakes can be classified according to their power source as pneumatic, hydraulic, and electronic. Electronic brakes are generally driven by an electric motor.

[0003] For example, an electromechanical brake for vehicle braking disclosed in Chinese patent literature [Application No.: CN202310501997.8, Publication No.: CN116480707A] includes a motor assembly and a caliper assembly. The caliper assembly is mounted on the motor assembly. The motor assembly includes a motor cover assembly, a motor housing, a circuit board, a stator, a planetary reduction mechanism, a rotor, and a parking mechanism. The parking mechanism is located inside the motor housing and is splinedly connected to the motor cover assembly. The stator is fixed to the inner wall of the motor housing. The circuit board is located at one end of the stator and is electrically connected to the motor cover assembly. The rotor is located inside the stator and has a first bearing inside. The rotor and the parking mechanism are rotatably connected through the first bearing. The planetary reduction mechanism is located inside the motor housing, and the rotor and the planetary reduction mechanism are geared. The caliper assembly is driven by the output shaft of the planetary reduction mechanism.

[0004] In the aforementioned brake, the circuit board is directly mounted on the stator of the motor. When the motor is powered on, the stator often generates heat, which can easily cause the components on the circuit board to overheat, leading to a decrease in the performance of the components and thus affecting the reliability of the brake. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing an electric disc brake with a parking function, and to solve the technical problem of how to improve the reliability of the brake.

[0006] The objective of this utility model can be achieved through the following technical solutions: An electric disc brake with parking function includes a caliper body, brake pads, a brake motor, and a circuit board. The brake motor includes a motor housing, a stator, and a rotor passing through the stator. The motor housing is fixedly connected to the rear end of the caliper body. A brake transmission mechanism is provided between the rotor and the brake pads. The motor housing has a cylindrical connecting wall inside and a mounting wall located on the outer periphery of the connecting wall. The stator is fixedly connected to the connecting wall. An intermediate seat located behind the stator is fixedly connected to the connecting wall. An end cap located behind the intermediate seat is fixedly connected to the mounting wall. The circuit board is fixedly connected to the mounting wall and located between the intermediate seat and the end cap, with the circuit board spaced apart from the intermediate seat.

[0007] During braking, the brake motor is energized and rotates. The rotor of the brake motor drives the brake pads through the brake transmission mechanism to achieve braking. When the brake is released, the brake motor is energized and rotates in the opposite direction. The heat generated by the energized brake motor stator is conducted to the motor housing through the connecting wall, and dissipated by the outer surface of the motor housing. The mounting wall is located on the outer periphery of the connecting wall. Compared to the connecting wall, the mounting wall is farther from the stator and has contact with the external space. Therefore, it dissipates heat faster than the connecting wall, and is less affected by the heat from the stator. The circuit board is fixedly connected to the mounting wall, which helps to prevent the circuit board from overheating. At the same time, the intermediate seat separates the circuit board from the stator, and the intermediate seat and the circuit board are spaced apart, further blocking the heat conduction through the intermediate seat, which can reduce the impact of the brake motor heat on the circuit board and also help to prevent the circuit board from overheating. In addition, the end cover and the mounting wall protect the circuit board, avoiding interference from the external environment and helping to ensure the normal operation of the circuit board. Therefore, this brake can reduce the impact of the brake motor heat on the circuit board, prevent the circuit board from overheating, and improve the reliability of the brake.

[0008] In the aforementioned electric disc brake with parking function, a rotating shaft is inserted and fixedly connected to the rotor. The front end of the rotating shaft is connected to the brake transmission mechanism. A positioning disc, a friction disc, a coupling disc, and a disk disc are sequentially mounted on the rotating shaft from front to back. The positioning disc, friction disc, coupling disc, and disk disc are all installed inside the rotor. An electromagnetic coil assembly is provided on the disk disc. The disk disc is fixedly connected to the intermediate seat. The positioning disc is fixedly connected to the disk disc. A spring connects the coupling disc to the disk disc. The friction disc is circumferentially fixed to the rotating shaft. When the electromagnetic coil assembly is energized, the coupling disc can overcome the elastic force of the spring and be attracted and fixed on the disk disc. When the electromagnetic coil assembly is de-energized, the spring acts on the coupling disc, causing the coupling disc to move toward the positioning disc and pressing the friction disc between the positioning disc and the coupling disc.

[0009] When parking brake is needed, the electromagnetic coil assembly is energized, the coupling plate is attracted and fixed to the disk, and the friction plate is not pressed between the positioning plate and the coupling plate. The shaft can rotate, the brake motor is energized and rotates, and the shaft drives the brake pads through the brake transmission mechanism to achieve braking. Then, the electromagnetic coil assembly is de-energized, the spring acts on the coupling plate, causing the coupling plate to move towards the positioning plate and press the friction plate between the positioning plate and the coupling plate. The shaft is locked, and parking brake is achieved. When parking brake needs to be released, the electromagnetic coil assembly is energized, the coupling plate is re-attracted and fixed to the disk, the friction plate is released, and then the brake motor rotates in the opposite direction to release the parking brake. The positioning plate, friction plate, coupling plate, and disk are all installed inside the rotor, making the brake structure compact, reducing the overall size of the brake, and making the brake easy to install on the vehicle.

[0010] In the aforementioned electric disc brake with parking function, the inner circumferential surface of the mounting wall has several protruding protrusions. The circuit board abuts against these protrusions and is fixedly connected by fixing screws. The protrusions reduce the contact between the circuit board and the mounting wall, minimizing the impact of heat conduction on the circuit board and helping to prevent overheating. Furthermore, the multiple protrusions provide relatively stable support for the circuit board, ensuring its stable fixation and improving the reliability of the brake.

[0011] In the aforementioned electric disc brake with parking function, thermally conductive silicone grease is applied between the components of the circuit board and the end cap. This grease improves thermal conductivity, allowing heat generated by the circuit board components to be quickly transferred to the end cap and dissipated rapidly through it. This helps prevent overheating of the circuit board and improves the reliability of the brake.

[0012] In the aforementioned electric disc brake with parking function, a rear bearing is provided between the rotating shaft and the intermediate seat, and a front bearing is provided between the front end of the rotor and the motor housing.

[0013] The rotor and shaft are supported by front and rear bearings, ensuring stable rotation of both. The intermediate seat not only isolates the stator and circuit board, reducing the impact of stator heat on the circuit board, but also supports the shaft, ensuring stable operation, making the brake structure compact, and improving the brake's reliability.

[0014] In the above-mentioned electric disc brake with parking function, a connecting screw connects the disk and the positioning disk. The connecting screw passes through the positioning disk and the coupling disk and is threaded to the disk. A positioning sleeve is fitted on the connecting screw, and the two ends of the positioning sleeve abut against the disk and the positioning disk, respectively.

[0015] The positioning plate is fixedly connected to the disk by connecting screws and positioning sleeves. At the same time, the positioning sleeve can limit the axial distance between the positioning plate and the disk, and circumferentially limit the coupling plate, so that the friction plate and the coupling plate move accurately and stably.

[0016] In the aforementioned electric disc brake with parking function, the rear end of the rotating shaft passes through the intermediate seat, circuit board, and end cover, and an oil seal is provided between the rear end of the rotating shaft and the end cover. When it is necessary to manually adjust the brake clearance of the brake disc, the rear end of the rotating shaft can be manually rotated.

[0017] In the aforementioned electric disc brake with parking function, the rear end of the rotating shaft is covered with a shaft cap located behind the oil seal, and the shaft cap is fixedly connected to the end cover. The shaft cap protects the oil seal.

[0018] In the aforementioned electric disc brake with parking function, a vent valve is fixedly connected to the end cover. The vent valve is used to balance the internal and external air pressure, ensuring stable brake operation.

[0019] Compared with the prior art, the present invention has the following advantages: This brake reduces the impact of brake motor heat on the circuit board, ensuring stable and reliable circuit board operation and thus improving the brake's reliability. Furthermore, the circuit board is housed within the motor housing, resulting in a compact brake structure, saving installation space and facilitating vehicle installation. The brake consists of a positioning disc, friction disc, coupling disc, and a disk with an electromagnetic coil assembly, ensuring stable parking. The brake's compact design is further enhanced by its placement within the rotor. The brake clearance can also be manually adjusted via the rear end of the shaft. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view of the brake.

[0021] Figure 2 yes Figure 1 A magnified view of a portion of the brake motor.

[0022] Figure 3 yes Figure 2 A magnified view of a portion of point A in the middle.

[0023] In the diagram, 1. Clamp body; 2. Brake pad; 3. Bracket; 4. Brake transmission mechanism; 5. Circuit board; 6. Brake motor; 6a. Motor housing; 6a1. Connecting wall; 6a2. Mounting wall; 6a3. Protrusion; 6b. Stator; 6c. Rotor; 6d. Shaft; 6e. Intermediate seat; 6f. Positioning disc; 6g. Friction disc; 6h. Coupling disc; 6j. Disk; 6k. Electromagnetic coil assembly; 6m. Connecting screw; 6n. Positioning sleeve; 6p. Spring; 6q. Front bearing; 6r. Rear bearing; 7. Fixing screw; 8. End cap; 9. Thermal grease; 10. Oil seal; 11. Shaft cap; 12. Vent valve. Detailed Implementation

[0024] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0025] like Figure 1 As shown, a brake includes a caliper body 1, brake pads 2, a bracket 3, a brake transmission mechanism 4, a brake motor 6, and a circuit board 5. The brake transmission mechanism 4 can drive the brake pads 2 to move, thereby achieving braking. The main structure of the brake is a conventional floating caliper disc brake. There are two brake pads 2, which are separately mounted on the bracket 3. A sliding rod is provided between the bracket 3 and the caliper body 1. The bracket 3 is used to fix it to the vehicle frame, and the sliding rod is fixed on the bracket 3. The sliding rod passes through the caliper body 1, and the caliper body 1 can slide along the sliding rod. The structure of the floating caliper disc brake can be found in patent documents with publication numbers CN1370701A or CN 2818904Y. A brake disc is fixed on the axle, and two brake pads 2 are located on both sides of the brake disc. The two brake pads 2 abut against the brake disc to form braking force. The brake transmission mechanism 4 includes a pusher plate, a ball screw pair, and a planetary gear assembly. The specific structure can be found in patent document with publication number CN116464724A.

[0026] like Figure 1 and Figure 2As shown, the brake motor 6 includes a motor housing 6a, a stator 6b, and a rotor 6c. The motor housing 6a is fixedly connected to the rear end of the clamp body 1. The stator 6b is fixed inside the motor housing 6a. The rotor 6c passes through the stator 6b. A rotating shaft 6d passes through and is fixedly connected to the rotor 6c. The rotating shaft 6d is tightly fitted and fixed to the rotor 6c. The front end of the rotating shaft 6d is connected to the planetary gear assembly of the brake transmission mechanism 4. The motor housing 6a has a cylindrical connecting wall 6a1 inside, and the motor housing 6a also has a mounting wall 6a2 located on the outer periphery of the connecting wall 6a1. The stator 6b is fixedly connected inside the connecting wall 6a1. An intermediate seat 6e located behind the stator 6b is fixedly connected to the connecting wall 6a1. The intermediate seat 6e is disc-shaped, and its outer edge has a protruding ring that is inserted into the connecting wall 6a1. The intermediate seat 6e and the connecting wall 6a1 can be tightly fitted and fixed, or fixed by bolts. An end cap 8 is fixedly connected to the mounting wall 6a2, located behind the intermediate seat 6e. The end cap 8 is fixedly connected to the mounting wall 6a2 by bolts. A circuit board 5 is fixedly connected to the mounting wall 6a2 and located between the intermediate seat 6e and the end cap 8, with the circuit board 5 spaced apart from the intermediate seat 6e. Several protruding protrusions 6a3 are located on the inner circumferential surface of the mounting wall 6a2. The circuit board 5 abuts against the protrusions 6a3 and is fixedly connected by fixing screws 7. The protrusions 6a3 are arranged sequentially along the circumference of the mounting wall 6a2. Several fixing screws 7 are provided, each corresponding to one of the protrusions 6a3. The fixing screws 7 pass through the circuit board 5 and are threaded into the protrusions 6a3. Thermal grease 9 is applied between the components of the circuit board 5 and the end cap 8; typically, thermal grease 9 is applied between the chip on the circuit board 5 and the end cap 8. The rear end of the rotating shaft 6d passes through the intermediate seat 6e, the circuit board 5, and the end cap 8. An oil seal 10 is provided between the rear end of the rotating shaft 6d and the end cap 8. The rear end cap of the rotating shaft 6d has a shaft cap 11 located behind the oil seal 10, which is fixedly connected to the end cover 8. To facilitate the installation and removal of the shaft cap 11, the shaft cap 11 and the end cover 8 can be threaded together, or the shaft cap 11 can be made of plastic or rubber and snap-fitted onto the end cover 8. To prevent the shaft cap 11 from being lost after disassembly, the shaft cap 11 has a connecting strip, one end of which is fixed to the end cover 8. A vent valve 12 is also fixedly connected to the end cover 8.

[0027] like Figure 2 and Figure 3As shown, the rotating shaft 6d passes through the intermediate seat 6e, and a rear bearing 6r is provided between the rotating shaft 6d and the intermediate seat 6e. A front bearing 6q is provided between the front end of the rotor 6c and the motor housing 6a. From front to back, the rotating shaft 6d is fitted with a positioning disc 6f, a friction disc 6g, a coupling disc 6h, and a disk disc 6j. All four are installed inside the rotor 6c. An electromagnetic coil assembly 6k is provided on the disk disc 6j. The disk disc 6j is fixedly connected to the intermediate seat 6e by bolts. The positioning disc 6f is fixedly connected to the disk disc 6j. A connecting screw 6m connects the disk disc 6j and the positioning disc 6f. The connecting screw 6m passes through the positioning disc 6f and the coupling disc 6h and is threadedly connected to the disk disc 6j. A positioning sleeve 6n is fitted on the connecting screw 6m, and the two ends of the positioning sleeve 6n abut against the disk disc 6j and the positioning disc 6f, respectively. There are several connecting screws 6m, evenly arranged circumferentially. A spring 6p connects the coupling disk 6h and the disk 6j. The disk 6j has a positioning groove, and several springs 6p are installed in the positioning groove, evenly arranged circumferentially. The friction disk 6g is circumferentially fixed to the rotating shaft 6d, and can move axially on the rotating shaft 6d. The friction disk 6g and the rotating shaft 6d are connected by a spline connection or by a hexagonal prism and hexagonal hole. When the electromagnetic coil assembly 6k is energized, the coupling disk 6h overcomes the elastic force of the spring 6p and is attracted and fixed to the disk 6j. When the electromagnetic coil assembly 6k is de-energized, the spring 6p acts on the coupling disk 6h, causing the coupling disk 6h to move towards the positioning disk 6f and pressing the friction disk 6g between the positioning disk 6f and the coupling disk 6h. The positioning disk 6f, friction disk 6g, coupling disk 6h, and disk 6j with the electromagnetic coil assembly 6k constitute a brake. The coil of the brake motor 6, the electromagnetic coil assembly 6k on the disk 6j, and the sensor inside the brake are all electrically connected to the circuit board 5. The circuit board 5 is also provided with wires, which are connected to electrical connectors. The electrical connectors are fixedly connected to the motor housing 6a between the connecting wall 6a1 and the mounting wall 6a2.

[0028] During service braking, the electromagnetic coil assembly 6k remains energized, the brake motor 6 rotates, and the shaft 6d drives the brake pads 2 through the brake transmission mechanism 4 to achieve braking. When the brake is released, the brake motor 6 is energized and rotates in the opposite direction. When parking brake is required, the electromagnetic coil assembly 6k is energized, the coupling disk 6h is attracted and fixed on the disk 6j, the friction disk 6g is released, the brake motor 6 is energized and rotates to apply brakes, then the electromagnetic coil assembly 6k is de-energized, the spring 6p acts on the coupling disk 6h, causing the coupling disk 6h to move towards the positioning disk 6f and pressing the friction disk 6g between the positioning disk 6f and the coupling disk 6h, locking the shaft 6d, thus achieving parking brake. When parking brake needs to be released, the electromagnetic coil assembly 6k is energized, the coupling disk 6h is re-attracted and fixed on the disk 6j, the friction disk 6g is released, and then the drive motor rotates in the opposite direction to release the parking brake.

[0029] In this brake, circuit board 5 is integrated inside the brake and is located between the intermediate seat 6e and the end cover 8, with a gap between circuit board 5 and intermediate seat 6e. The brake is installed inside the rotor 6c of the brake motor 6 to achieve parking braking. This brake has the advantages of compact structure, small installation space occupation, convenient installation, high reliability, and stable parking.

[0030] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. An electric disc brake with parking function, comprising a caliper (1), brake pads (2), a brake motor (6), and a circuit board (5), wherein the brake motor (6) comprises a motor housing (6a), a stator (6b), and a rotor (6c) passing through the stator (6b), the motor housing (6a) being fixedly connected to the rear end of the caliper (1), and a brake transmission mechanism (4) being provided between the rotor (6c) and the brake pads (2), characterized in that, The motor housing (6a) has a cylindrical connecting wall (6a1) inside. The motor housing (6a) also has a mounting wall (6a2) located on the outer periphery of the connecting wall (6a1). The stator (6b) is fixedly connected inside the connecting wall (6a1). An intermediate seat (6e) located behind the stator (6b) is fixedly connected to the connecting wall (6a1). An end cover (8) located behind the intermediate seat (6e) is fixedly connected to the mounting wall (6a2). The circuit board (5) is fixedly connected to the mounting wall (6a2) and located between the intermediate seat (6e) and the end cover (8). The circuit board (5) and the intermediate seat (6e) are spaced apart.

2. The electric disc brake with parking function according to claim 1, characterized in that, A rotating shaft (6d) is inserted and fixedly connected to the rotor (6c). The front end of the rotating shaft (6d) is connected to the braking transmission mechanism (4). A positioning disk (6f), a friction disk (6g), a coupling disk (6h), and a disk (6j) are sequentially mounted on the rotating shaft (6d) from front to back. The positioning disk (6f), friction disk (6g), coupling disk (6h), and disk (6j) are all installed inside the rotor (6c). An electromagnetic coil assembly (6k) is provided on the disk (6j). The disk (6j) is fixedly connected to the intermediate seat (6e). The positioning disk (6f) The coupling disk (6h) is fixedly connected to the disk (6j). A spring (6p) is connected between the coupling disk (6h) and the disk (6j). The friction disk (6g) is circumferentially fixed to the rotating shaft (6d). When the electromagnetic coil assembly (6k) is energized, the coupling disk (6h) can overcome the elastic force of the spring (6p) and be attracted and fixed on the disk (6j). When the electromagnetic coil assembly (6k) is de-energized, the spring (6p) acts on the coupling disk (6h) to move the coupling disk (6h) toward the positioning disk (6f) and press the friction disk (6g) between the positioning disk (6f) and the coupling disk (6h).

3. The electric disc brake with parking function according to claim 1 or 2, characterized in that, The inner circumferential surface of the mounting wall (6a2) has several protruding protrusions (6a3), and the circuit board (5) abuts against the protrusions (6a3) and is fixedly connected by fixing screws (7).

4. The electric disc brake with parking function according to claim 1 or 2, characterized in that, Thermal grease (9) is provided between the components of the circuit board (5) and the end cap (8).

5. The electric disc brake with parking function according to claim 2, characterized in that, A rear bearing (6r) is provided between the rotating shaft (6d) and the intermediate seat (6e), and a front bearing (6q) is provided between the front end of the rotor (6c) and the motor housing (6a).

6. The electric disc brake with parking function according to claim 2 or 5, characterized in that, A connecting screw (6m) connects the disk (6j) and the positioning disk (6f). The connecting screw (6m) passes through the positioning disk (6f) and the coupling disk (6h) and is threaded to the disk (6j). A positioning sleeve (6n) is fitted on the connecting screw (6m). The two ends of the positioning sleeve (6n) abut against the disk (6j) and the positioning disk (6f) respectively.

7. The electric disc brake with parking function according to claim 2 or 5, characterized in that, The rear end of the rotating shaft (6d) passes through the intermediate seat (6e), the circuit board (5) and the end cover (8), and an oil seal (10) is provided between the rear end of the rotating shaft (6d) and the end cover (8).

8. The electric disc brake with parking function according to claim 7, characterized in that, The rear end of the rotating shaft (6d) is covered with a shaft cap (11) located behind the oil seal (10), and the shaft cap (11) is fixedly connected to the end cover (8).

9. The electric disc brake with parking function according to claim 1 or 2, characterized in that, A vent valve (12) is fixedly connected to the end cap (8).

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