Highly reliable integrated electric brake device

Abstract

The application provides a high-reliability integrated electric brake device, and belongs to the technical field of brake equipment. The device comprises a mounting bracket, a push plate and a main electric actuator. The main electric actuator is connected to the mounting bracket, and the top pushing end of the main electric actuator is connected to the push plate. The electric brake device further comprises a brake release driving mechanism, which is arranged on the mounting bracket. The driving end of the brake release driving mechanism is connected to the push plate. After the main electric actuator pushes the push plate, the driving end of the brake release driving mechanism slides outward along with the push plate. After the main electric actuator fails, the brake release driving mechanism can pull the push plate in the reverse direction to reset the top pushing end of the push plate and the main electric actuator. When the main electric actuator fails and cannot release the brake, the driving end of the brake release mechanism can pull the push plate in the reverse direction to reset the push plate and realize the brake release process. The above arrangement can improve the reliability of the electric brake device.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of braking equipment, and particularly relates to a high-reliability integrated electric brake device. BACKGROUND

[0002] With the increasing requirement of civil aviation passenger aircraft and medium-large unmanned aerial vehicles on brake performance, the electric brake has advantages of good maintainability, high brake sensitivity, rapid safety and the like compared with the traditional hydraulic brake, and therefore the electric brake can replace the traditional hydraulic brake.

[0003] The electric brake device in the prior art comprises an electric actuator, a mounting bracket and a brake push plate; during braking, the electric actuator is controlled by an electric brake system, an electromagnetic force is converted into torque by a servo motor, the torque is then amplified by a reduction gear, and the amplified torque is then converted into a straight-line force output of the brake push plate by a ball screw, so as to press a brake disc and provide power for braking.

[0004] Since the required output force of an aircraft brake is large, a multi-link transmission chain reduction mechanism is designed for the electric actuator of the traditional electric brake device to improve the rotation speed of the servo motor and then improve the power density of the electric actuator; a thrust sensor is arranged at the end of the reduction mechanism to detect the load thrust and realize force closed-loop control; however, the thrust sensor has a high failure rate and is complex to install, and the multi-link transmission chain reduction mechanism and the arrangement of the thrust sensor result in a complex shape of the electric actuator, a large required installation space, compression of the use space of components such as a wheel heat sink and a shell, and then limitation of the brake performance and service life of the brake device.

[0005] In addition, after a failure occurs during braking of the electric brake device in the prior art, the brake push plate cannot be returned, and then the brake cannot be released, which exists a safety hazard. SUMMARY

[0006] The embodiment of the application provides a high-reliability integrated electric brake device, and aims to solve the technical problem that the electric brake device in the prior art cannot release the brake after a failure occurs during braking.

[0007] To achieve the above-mentioned purpose, the technical scheme adopted by the application is as follows:

[0008] The application provides a high-reliability integrated electric brake device, which comprises a mounting bracket, a push plate and a main electric actuator, the main electric actuator is connected to the mounting bracket, the top pushing end of the main electric actuator is connected to the push plate, and the electric brake device further comprises:

[0009] A brake release driving mechanism is arranged on the mounting bracket, and the driving end of the brake release driving mechanism is connected to the push plate.

[0010] Wherein, after the main electric actuator pushes the push plate, the driving end of the loose brake driving mechanism slides outwards following the push plate; when braking, after the main electric actuator fails, the driving end of the loose brake driving mechanism can pull the push plate reversely to reset the push plate and the pushing end of the main electric actuator.

[0011] In a possible implementation, the loose brake driving mechanism comprises at least one auxiliary electric actuator, the auxiliary electric actuator is connected to the mounting bracket, and the driving end of the auxiliary electric actuator is connected to the push plate; wherein, the main electric actuator and the auxiliary electric actuator are arranged along the circumference of the mounting bracket.

[0012] In a possible implementation, the auxiliary electric actuator comprises:

[0013] A reverse planetary roller screw comprises a nut, a screw rod and rollers; one end of the screw rod is connected to the push plate;

[0014] A first housing is connected to the mounting bracket; the nut of the reverse planetary roller screw is rotatably arranged in the first housing;

[0015] A stator is connected to the inner circumferential wall of the first housing;

[0016] A rotor is rotatably arranged in the first housing and connected to the nut of the reverse planetary roller screw.

[0017] In a possible implementation, the main electric actuator comprises:

[0018] A reverse planetary roller screw comprises a nut, a screw rod and rollers; one end of the screw rod is connected to the push plate;

[0019] A first housing is connected to the mounting bracket; the nut of the reverse planetary roller screw is rotatably arranged in the first housing;

[0020] A stator is connected to the inner circumferential wall of the first housing;

[0021] A rotor is rotatably arranged in the first housing and connected to the nut of the reverse planetary roller screw.

[0022] In a possible implementation, a position sensor is connected in the first housing, and the position sensor is used to detect the running position of the rotor.

[0023] In a possible implementation, the loose brake driving mechanism comprises:

[0024] A second housing is connected to the mounting bracket; the second housing has a sliding space inside;

[0025] A sliding part is slidably arranged in the sliding space at one end thereof, and the other end of the sliding part is located outside the second shell, and the outer end of the sliding part is connected with the push plate.

[0026] The sliding space is provided with an elastic part, and the two ends of the elastic part are connected with the second shell and the sliding part respectively.

[0027] In a possible implementation, the outer peripheral wall of the inner end of the sliding part is provided with external threads, and a nut is threadedly connected with the sliding part, and the nut is in sliding connection with the second shell.

[0028] The nut is in abutting connection with the elastic part.

[0029] In a possible implementation, the push plate is provided with a protruding part connected with the sliding part.

[0030] In a possible implementation, the first shell is integrally arranged with the mounting bracket.

[0031] In a possible implementation, the sliding part comprises:

[0032] A slide rod is slidably arranged in the sliding space at one end thereof in the movement direction of the push plate, and the other end of the slide rod is located outside the second shell.

[0033] A limiting disc is connected with the outer end of the slide rod, and the limiting disc is connected with the push plate.

[0034] A limiting block is connected with the inner end of the slide rod.

[0035] The two ends of the elastic part are connected with the second shell and the limiting block respectively.

[0036] When the push plate moves towards the carbon disc of the aircraft wheel to brake, the slide rod moves along with the push plate, and the elastic part is compressed to generate a pre-tightening force; when the push plate moves away from the carbon disc of the aircraft wheel to release the brake, the slide rod moves along with the push plate, and the elastic part returns to the original shape.

[0037] Compared with the prior art, the high-reliability integrated electric brake device provided by the application can drive the push plate to extend by the top pushing end of the main electric actuator when the device is in normal operation, so that the push plate is pressed against the carbon disc of the aircraft wheel to achieve the braking of the aircraft; when the main electric actuator fails to release the brake after the braking is completed, the driving end of the brake release mechanism can pull the push plate in the reverse direction to reset the push plate and release the brake; the above arrangement can improve the reliability of the electric brake device. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 A schematic view of a high-reliability integrated electric brake device provided by an embodiment of the present application;

[0039] Figure 2 A top view of a high-reliability integrated electric brake device provided by an embodiment of the present application;

[0040] Figure 3 A schematic view of Figure 2 A schematic view of a cross section of A-A;

[0041] Figure 4 A schematic view of Figure 2 A schematic view of a cross section of B-B;

[0042] Figure 5 A schematic view of a rotor part of a high-reliability integrated electric brake device provided by an embodiment of the present application;

[0043] Figure 6 A schematic view of Figure 5 A schematic view of a cross section of C-C;

[0044] Figure 7 A schematic view of a push plate part of a high-reliability integrated electric brake device provided by an embodiment of the present application.

[0045] Legend: 1, mounting bracket; 2, push plate; 21, protruding part; 3, main electric actuator; 4, auxiliary electric actuator; 41, first housing; 42, stator; 43, rotor; 44, reverse planetary roller screw; 45, position sensor; 5, second housing; 6, sliding part; 61, sliding rod; 62, limit disc; 7, elastic part; 8, nut. DETAILED DESCRIPTION

[0046] In order to make the technical problems, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0047] Please refer to Figures 1 to 7The application provides a high-reliability integrated electric brake device, which comprises a mounting bracket 1, a push plate 2 and a main electric actuator 3, the main electric actuator 3 is connected to the mounting bracket 1, the top pushing end of the main electric actuator 3 is connected to the push plate 2, the electric brake device further comprises a brake release driving mechanism, the brake release driving mechanism is arranged on the mounting bracket 1, the driving end of the brake release driving mechanism is connected to the push plate 2, wherein after the main electric actuator 3 pushes the push plate 2, the driving end of the brake release driving mechanism slides outward along with the push plate 2, it is to be noted that the driving end of the brake release driving mechanism has an extension process and a retraction process, and the outward sliding herein refers to the extension process of the driving end, after the main electric actuator 3 fails, the driving end of the brake release driving mechanism can reversely pull the push plate 2, so that the push plate 2 and the top pushing end of the main electric actuator 3 are reset.

[0048] Compared with the prior art, the high-reliability integrated electric brake device provided by the application can drive the push plate 2 to extend through the top pushing end of the main electric actuator 3 when working normally, so that the push plate 2 is pressed against the carbon disc of the aircraft wheel, and the aircraft is braked; when the main electric actuator 3 fails and cannot release the brake after the braking is completed, the driving end of the brake release mechanism can reversely pull the push plate 2, so that the push plate 2 is reset, and the brake release process is realized; through the above arrangement, the reliability of the electric brake device can be improved.

[0049] In some embodiments, as shown in Figures 1 to 7 the brake release driving mechanism at least comprises one auxiliary electric actuator 4, the auxiliary electric actuator 4 is connected to the mounting bracket 1, the driving end of the auxiliary electric actuator 4 is connected to the push plate 2, wherein the main electric actuator 3 and the auxiliary electric actuator 4 are arranged along the circumference of the mounting bracket 1; after the main electric actuator 3 fails, the auxiliary electric actuator 4 can drive the push plate 2 to reset, so that the brake release purpose is realized.

[0050] For example, the main electric actuator 3 and the auxiliary electric actuator 4 have the same structure, and the auxiliary electric actuator 4 is taken as an example for description; the auxiliary electric actuator 4 comprises a reverse planetary roller screw 44, a first housing 41, a stator 42 and a rotor 43; the reverse planetary roller screw 44 comprises a nut, a screw rod and a roller; one end of the screw rod is connected to the push plate 2; the first housing 41 is connected to the mounting bracket 1, and the nut of the reverse planetary roller screw 44 is rotationally arranged in the first housing 41; the stator 42 is connected to the inner circumferential wall of the first housing 41; the rotor 43 is rotationally arranged in the first housing 41, specifically, the rotor 43 is rotationally mounted in the stator 42 and connected to the nut of the reverse planetary roller screw 44. The specific operation process is as follows: the motor stator coil is electrified, the motor rotor rotates and synchronously drives the nut of the reverse planetary roller screw to rotate, the roller of the reverse planetary roller screw rotates around the screw rod of the reverse planetary roller screw, and the screw rod of the reverse planetary roller screw outputs linearly to drive the push plate to move.

[0051] Exemplarily, the first shell 41 is integrally arranged with the mounting bracket 1, which not only bears the functions of mounting the electric brake device and the aircraft wheel, but also serves as the support shell of the electric actuator. The separate parts of the brake device mounting bracket are reduced, and the compactness and the mounting stiffness of the brake device are improved. The stator 42 and the rotor 43 are mounted in the first shell 41 to form a permanent magnet synchronous servo motor, which can save the space of the motor shell and improve the compactness of the whole device.

[0052] Exemplarily, the rotor 43 can be connected to the outer peripheral wall of the nut of the reverse planetary roller screw 44, and the rotor 43 can also serve as the nut of the reverse planetary roller screw 44. When the rotor 43 serves as the nut of the reverse planetary roller screw 44, a threaded hole is arranged on the rotor 43, and the roller of the reverse planetary roller screw 44 is threadedly connected with the threaded hole of the rotor 43. During the rotation of the rotor 43, the extension or retraction of the screw rod can be realized.

[0053] Through the above arrangement, the adapter parts between the servo motor rotor 43 and the nut of the reverse planetary roller screw 44 are reduced, and the compactness of the transmission connection between the permanent magnet synchronous servo motor and the reverse planetary roller screw 44 is improved.

[0054] In the electric brake device, unlike the conventional electric brake device, the electric actuator shell and the permanent magnet synchronous servo motor shell are designed as one part, and the permanent magnet synchronous motor stator of the electric actuator is assembled into the electric actuator shell, i.e., the first shell 41, which reduces the shell of the permanent magnet synchronous servo motor and improves the compactness of the permanent magnet synchronous servo motor structure.

[0055] It should be noted that in the device, the efficiency of the reverse planetary roller screw 44 in driving linear motion from rotary motion is 87%, and the efficiency of linear motion in driving rotary motion is 85%, so the forward efficiency and the reverse efficiency of the reverse planetary roller screw 44 in the device are comparable. The main electric actuator 3 and the auxiliary electric actuator 4 are uniformly arranged along the circumference of the mounting bracket 1 to make the driving force more balanced.

[0056] The auxiliary electric actuator 4 can realize one-time redundant brake release. When the main electric actuator 3 fails or the controller of the main electric actuator 3 fails, the stator 42 of the auxiliary electric actuator 4 drives the rotor 43 to rotate in the reverse direction, and then the reverse planetary roller screw 44 of the auxiliary electric actuator 4 is retracted, thereby driving the push plate 2 to retract and realizing the process of releasing the brake. During the retraction of the push plate 2, the push plate 2 can provide a thrust force to the reverse planetary screw of the main electric actuator 3, so that the reverse planetary screw is retracted into the first shell 41 of the main electric actuator 3.

[0057] In some embodiments, as Figures 1 to 7As shown, the first housing 41 is connected with a position sensor 45 for detecting the operating position of the rotor 43; the position sensor 45 is located at one end of the first housing 41 away from the reverse planetary roller screw 44, by arranging the position sensor 45 in the first housing 41, the rotating position of the rotor 43 can be obtained, that is, the rotating coordinates of the rotor 43 can be obtained; the device removes the thrust sensor, and uses a three-loop control mode of current loop, speed loop and phase current equivalent force negative feedback force loop in control: the current is equivalent force feedback, that is, the phase current signal of the permanent magnet synchronous servo motor is obtained through static coordinate transformation and synchronous rotating coordinate transformation to obtain high-frequency cross-axis current, the low-frequency cross-axis current is obtained after the high-frequency cross-axis current is filtered through a 100Hz low-pass filter, and the low-frequency cross-axis current is multiplied by the torque coefficient of the permanent magnet synchronous servo motor and the screw reduction ratio to obtain the equivalent thrust. Through the above control mode of the present application, it is not necessary to install the force sensor with high failure rate, and the complex installation structure is also avoided, so that the reliability of the device can be improved. Through the above control mode of the present application, the pressure of the push plate 2 can be controlled, and the torque of the wheel brake can be adjusted.

[0058] In some embodiments, as Figures 1 to 7 As shown, the loose brake driving mechanism comprises a second housing 5 and a sliding component 6; the second housing 5 is connected to the mounting bracket 1; the inside of the second housing 5 has a sliding space; one end of the sliding component 6 is slidingly arranged in the sliding space; the other end of the sliding component 6 is located outside the second housing 5, and the outer end of the sliding component 6 is connected with the push plate 2; the outer end of the sliding component 6 is the driving end; wherein the sliding space is provided with an elastic component 7, and the two ends of the elastic component 7 are connected with the second housing 5 and the sliding component 6 respectively; when the outer end of the sliding component 6 slides outward, the elastic component 7 is in a compressed state.

[0059] For example, the sliding component 6 comprises a sliding rod 61, a limiting disc 62 and a limiting block; one end of the sliding rod 61 is slidingly arranged in the sliding space along the movement direction of the push plate 2, and the other end is located outside the second housing 5; the limiting disc 62 is connected to the outer end of the sliding rod 61; the limiting disc 62 is connected with the push plate 2; the limiting block is connected to the inner end of the sliding rod 61; wherein the two ends of the elastic component 7 are connected with the second housing 5 and the limiting block respectively; when the push plate 2 moves to brake the carbon disc of the wheel, the sliding rod 61 moves with the push plate 2, and the elastic component 7 is compressed to generate a pre-tightening force; when the push plate 2 moves away from the carbon disc of the wheel, the sliding rod 61 moves with the push plate 2, and the elastic component 7 returns to its original shape.

[0060] Specifically, the limiting block can be a nut 8, an outer peripheral wall on an inner side end of the slide rod 61 is provided with an external thread, the nut 8 is threadedly matched with the inner side end of the slide rod 61; the nut 8 can slide in a sliding space of the second shell 5; the nut 8 is abuttingly matched with the elastic component 7; the second shell 5 is integrally arranged with the mounting bracket 1, the elastic component 7 can be a disc spring, the disc spring is sleeved on the sliding component 6, the disc spring is sleeved on the slide rod 61, the nut 8 abuts against the disc spring; the second shell 5 can be multiple and is uniformly arranged along a circumference of the mounting bracket 1. By arranging the nut 8 on the sliding component 6, installation is facilitated; when the nut 8 moves along with the sliding component 6, the nut 8 will compress the disc spring, so that the disc spring generates a pre-tightening force.

[0061] For example, a diameter of the limiting disc 62 is greater than a diameter of the slide rod 61, the push plate 2 is provided with a slot for placing the limiting disc 62, a slot bottom of the slot is provided with a through hole for the slide rod 61 to pass through; a thickness of the limiting disc 62 is less than or equal to a depth of the slot. Through the above arrangement, the slide rod 61 can pass through the push plate 2 and be located in the second shell 5; by inserting the limiting disc 62 into the slot, the installation position of the slide rod 61 can be limited. Under the action of the disc spring elastic force, the limiting disc 62 can always abut against the slot bottom.

[0062] Specifically, when the push plate 2 slides towards the aircraft wheel carbon disc, the push plate 2 can drive the limiting disc 62 to slide, and then make the slide rod 61 extend out of the second shell 5; when the slide rod 61 extends out of the second shell 5, the nut 8 at the inner side end of the slide rod 61 compresses the disc spring, and the elastic force of the disc spring will increase.

[0063] By arranging the second shell 5, the sliding component 6 and the elastic component 7, two-degree redundancy brake release can be realized, and the working principle is as follows: after the main electric actuator 3 and the auxiliary electric actuator 4 both fail, the push plate 2 loses the driving force, at this time, the push plate 2 is reset under the action of the disc spring elastic force, so that the purpose of releasing the brake is achieved; in the process of resetting the push plate 2, the push plate 2 can push the reverse planetary roller screw 44 of the main electric actuator 3 and the reverse planetary roller screw 44 of the auxiliary electric actuator 4 back into the respective first shell 41. Through the above arrangement of the present application, the reliability of the device can be further improved.

[0064] In some embodiments, as Figures 1 to 7As shown, the push plate 2 has a protruding part 21 connected with the sliding part 6; the setting mode of the protruding part 21 on the push plate 2 is obtained through finite element analysis, which can improve the rigidity of the push plate 2, and when the reverse planetary roller screw 44 of the auxiliary electric actuator 4 is actively retracted, the main electric actuator 3 can be quickly corresponded, so that the reverse planetary roller screw 44 of the main electric actuator 3 is synchronously retracted. By setting the protruding part 21 on the push plate 2, a counterbore can be arranged at the bottom of the push plate 2, and then the push plate 2 and the sliding part 6 can be connected together through screws. When the protruding part 21 is multiple, the driving end of the reverse planetary roller screw 44 is connected between the adjacent protruding parts 21 on the adjacent push plates.

[0065] In some embodiments, as shown in the drawings, Figures 1 to 7 As shown, the electric brake device of the application includes three integrated designs:

[0066] 1. The first housing 41 of the main electric actuator 3 and the first housing 41 of the auxiliary electric actuator 4 are integrally arranged with the mounting bracket 1, which not only bears the function of mounting the electric brake device and the aircraft wheel, but also serves as the support housing of the electric actuator; the separate parts of the brake device mounting bracket 1 are reduced, and the compactness and rigidity of the brake device installation are improved.

[0067] 2. The connection mode of the main electric actuator 3 and the reverse planetary roller screw 44 is the same as that of the auxiliary electric actuator 4 and the reverse planetary roller screw 44, and the auxiliary electric actuator 4 is taken as an example for description; the first housing 41 of the auxiliary electric actuator 4 is integrally arranged with the housing of the permanent magnet synchronous servo motor, which reduces the housing of the permanent magnet synchronous servo motor and improves the compactness of the structure of the permanent magnet synchronous servo motor.

[0068] 3. The rotor 43 of the permanent magnet synchronous servo motor is integrally arranged with the nut of the reverse planetary roller screw 44, which reduces the adapter parts between the rotor 43 of the servo motor and the nut of the reverse planetary roller screw 44 and improves the compactness of the transmission connection between the permanent magnet synchronous servo motor and the reverse planetary roller screw 44.

[0069] In addition, through the one-degree redundant loose brake, the two-degree redundant loose brake, and the three-loop control mode of the current loop, the speed loop, and the phase current equivalent force negative feedback force loop of the application, the force sensor is not required, and the reliability of the electric brake device of the application can be improved.

[0070] Based on the same inventive concept, the application further provides a control method, which includes the following steps:

[0071] After the main electric actuator 3 pushes the push plate 2, the driving end of the loose brake driving mechanism slides outward with the push plate 2; after the main electric actuator 3 fails, the loose brake driving mechanism can reversely pull the push plate 2 to reset the push plate 2 and the pushing end of the main electric actuator 3.

[0072] The above merely provides the preferred embodiment of the present application, and not intended to limit the present application. Accordingly, any modification, equivalent replacement, and improvement made without departing from the spirit and principle of the present application shall fall in the scope of protection of the present application.

Claims

1. A highly reliable integrated electric braking device, characterized in that, The device comprises a mounting bracket, a push plate and a main electric actuator, the main electric actuator is connected to the mounting bracket, and the top pushing end of the main electric actuator is connected to the push plate; The electric brake device further comprises: A loose brake driving mechanism is arranged on the mounting bracket, and the driving end of the loose brake driving mechanism is connected to the push plate; After the push plate is pushed by the main electric actuator, the driving end of the loose brake driving mechanism slides outward along with the push plate; after the main electric actuator fails, the driving end of the loose brake driving mechanism can pull the push plate in the reverse direction to reset the push plate and the top pushing end of the main electric actuator; The loose brake driving mechanism comprises at least one auxiliary electric actuator, the auxiliary electric actuator is connected to the mounting bracket, and the driving end of the auxiliary electric actuator is connected to the push plate; wherein the main electric actuator and the auxiliary electric actuator are arranged along the circumference of the mounting bracket; the structure of the main electric actuator is the same as that of the auxiliary electric actuator; the auxiliary electric actuator comprises: A reverse planetary roller screw comprises a nut, a screw rod and a roller; one end of the screw rod is connected to the push plate; A first housing is connected to the mounting bracket; the nut of the reverse planetary roller screw is rotatably arranged in the first housing; A stator is connected to the inner circumferential wall of the first housing; A rotor is rotatably arranged in the first housing and connected to the nut of the reverse planetary roller screw.

2. A high reliable integrated electric brake as claimed in claim 1, wherein, A position sensor is connected in the first housing, and the position sensor is used to detect the running position of the rotor.

3. A high reliable integrated electric brake as claimed in claim 1, wherein, The loose brake driving mechanism comprises: A second housing is connected to the mounting bracket; the second housing has a sliding space inside; A sliding component is slidably arranged in the sliding space; the other end of the sliding component is located outside the second housing, and the outer end of the sliding component is connected to the push plate; The sliding space is provided with an elastic component, and the two ends of the elastic component are connected to the second housing and the sliding component respectively; when the outer end of the sliding component slides outward, the elastic component is in a compressed state.

4. A high reliable integrated electric brake as claimed in claim 3, wherein the electric brake is characterized by: The outer circumferential wall of the inner end of the sliding component has external threads, a nut is threadedly connected to the sliding component, and the nut is in sliding cooperation with the second housing; The nut is in abutting cooperation with the elastic component.

5. A highly reliable integrated electric braking device as described in claim 3, characterized in that, The push plate has a protruding part connected to the sliding component.

6. A high reliable integrated electric brake as claimed in claim 1, wherein, The first housing is integrally arranged with the mounting bracket.

7. A high reliable integrated electric brake as claimed in claim 3 wherein, the said electric brake is a DC electric brake. The sliding component comprises: A slide rod is slidably arranged in the sliding space along the movement direction of the push plate, and the other end of the slide rod is located outside the second housing; A limiting disc is connected to the outer end of the slide rod; the limiting disc is connected to the push plate; A limiting block is connected to the inner end of the slide rod; The two ends of the elastic component are connected to the second housing and the limiting block respectively; When the push plate moves to brake the carbon disc of the wheel, the slide rod moves along with the push plate, and the elastic component is compressed to generate a pre-tightening force; when the push plate moves away from the carbon disc of the wheel to release the brake, the slide rod moves along with the push plate, and the elastic component returns to its original shape.

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