Brake capable of automatically compensating clearance
By introducing a return mechanism and an interference fit slip sleeve into the brake, the brake pad wear is automatically compensated, which solves the problem of brake failure caused by brake pad wear, and achieves rapid disengagement and wear compensation, which improves the safety and economy of the brake.
Patent Information
- Application Number
- CN202422735003.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-11
- Publication Date
- 2025-08-01
- Estimated Expiration
- 2034-11-11
AI Technical Summary
After the brake pads are worn to a certain extent, the existing brakes cannot maintain close fit with the brake disc, resulting in brake failure, posing safety hazards, and frequent replacement of brake pads increases the cost of use.
A brake that automatically compensates for gaps is designed, and the piston is connected by a return mechanism and an interference-coordinated sliding sleeve. The return spring is used to quickly return to position, so as to achieve rapid separation of the brake pad and the brake disc, and to compensate for wear thickness through the movement of the sliding sleeve to ensure the braking effect.
The brake pads and brake discs are quickly separated, avoid excessive wear and high temperatures, extend the service life of the brake pads, reduce the replacement frequency, and ensure safety and economy.
Smart Images
Figure CN223178030U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of brakes, and particularly relates to a brake with automatic clearance compensation. Background Technique
[0002] A brake is a commonly used braking device in common engineering machinery and automobiles. Its principle is that when the brake works, a frictional force is generated between the friction plate and the friction disc on the brake, so that the rotational kinetic energy can be effectively converted into heat energy, thereby achieving the braking effect. A wet brake is one of many types of brakes. The wet brake uses hydraulic transmission to achieve the braking effect. Inside the wet brake, a certain amount of hydraulic oil is filled. When the brake needs to be braked, a pressure oil pump injects hydraulic oil into the brake to form a certain hydraulic pressure. This hydraulic pressure causes the friction plate and the friction disc inside the brake to come into close contact, thereby achieving the braking effect.
[0003] With the increase in the use time and frequency of the brake, the thickness of the brake pad gradually becomes thinner. In order to achieve a good frictional braking effect, it is necessary to increase the amplitude of stepping on the brake pedal to ensure the tightness between the brake pad and the brake disc, thereby ensuring its braking effect. However, when the wear of the brake pad exceeds a certain limit, even if the brake pedal is depressed to the maximum extent, it is impossible to keep the brake pad and the brake disc in close contact. At this time, the brake cannot provide sufficient braking force, that is, the brake fails, which is extremely likely to cause serious traffic safety accidents. Therefore, it is necessary to design a brake that can compensate for the wear thickness of the friction plate, which can not only ensure the normal braking effect but also avoid frequent replacement of the brake pad and save the use cost. Content of the Utility Model
[0004] The purpose of the utility model is to provide a brake in which the brake pad and the brake disc can be quickly separated after braking to solve the problems raised in the above background technique.
[0005] To achieve the above technical purpose, the technical solution of the utility model is as follows:
[0006] A brake with automatic clearance compensation includes a housing and a piston slidably connected to the housing. A hydraulic chamber for accommodating hydraulic oil is provided between the housing and the piston. An installation hole is provided on the end face of the housing, and a return mechanism is installed in the installation hole. The return mechanism includes a guide post, a sliding sleeve is sleeved outside the guide post, the sliding sleeve is in interference connection with the inner side wall of the installation hole, one end of the guide post is threadedly connected to the piston, the other end of the guide post is fixedly connected with a first spring seat, a second spring seat and a return spring are sleeved outside the guide post, one end of the second spring seat abuts against the sliding sleeve, the other end of the second spring seat abuts against the return spring, the second spring seat is slidably matched with the guide post, and the other end of the return spring abuts against the first spring seat.
[0007] As a further improvement, a boss is provided on the outer circumferential surface of the guide post. One end face of the boss abuts against the piston, and the other end face of the boss is in separable contact with the sliding sleeve.
[0008] As a further improvement, an opening is provided on the side surface of the sliding sleeve. The opening extends along the axial direction of the sliding sleeve and penetrates through both end faces of the sliding sleeve.
[0009] As a further improvement, an oil inlet is provided in the hydraulic chamber. The oil inlet is communicated with the brake oil pump of the vehicle.
[0010] As a further improvement, a sealing ring is installed on the side surface of the housing that is in sliding contact with the piston.
[0011] As a further improvement, a brake pad is installed on the outer end face of the piston connected to the guide post.
[0012] Due to the adoption of the above technical solutions, the beneficial effects of the present utility model are as follows:
[0013] The brake with automatic clearance compensation provided by the present utility model, by setting a return mechanism, when the braking ends, the return spring can quickly return the piston to its original position and quickly separate the brake pad from the brake disc, avoiding excessive wear of the brake pad and high temperature caused by friction when there is relative rotation due to incomplete separation between the two; due to the connection relationship of slight interference fit between the sliding sleeve and the housing, the return spring can push the sliding sleeve to move, thereby compensating for the worn thickness of the brake pad. Description of the Drawings
[0014] Figure 1 is the schematic structural diagram of the whole of the present utility model;
[0015] Figure 2 is the sectional view of the present utility model;
[0016] Figure 3 is the partial sectional view of the present utility model;
[0017] Figure 4 is the schematic structural diagram of the housing of the present utility model;
[0018] Figure 5 is the sectional view of the return mechanism of the present utility model;
[0019] Figure 6 is the schematic structural diagram of the sliding sleeve of the present utility model.
[0020] Wherein: 1 - housing, 2 - piston, 3 - hydraulic chamber, 4 - return mechanism, 401 - guide post, 4011 - boss, 402 - sliding sleeve, 403 - first spring seat, 404 - second spring seat, 405 - return spring, 5 - oil inlet, 6 - sealing ring, 7 - brake pad. Detailed implementation manners
[0021] To make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below in conjunction with the detailed implementation manners and with reference to the accompanying drawings. Among them, the accompanying drawings are only for illustrative purposes, showing only schematic diagrams rather than physical diagrams, and should not be construed as a limitation to this application; in order to better illustrate the embodiments of the present utility model, some components in the accompanying drawings will be omitted, enlarged or reduced, and do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted.
[0022] In the accompanying drawings of the embodiments of the present utility model, the same or similar reference numerals correspond to the same or similar components; in the description of the present utility model, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the accompanying drawings are only for illustrative purposes and should not be construed as a limitation to this application. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.
[0023] As Figure 1-6 shown, a brake with automatic clearance compensation includes a housing 1 and a piston 2 slidably connected to the housing 1. A hydraulic chamber 3 for containing hydraulic oil is provided between the housing 1 and the piston 2. An installation hole is provided on the end face of the housing 1, and a return mechanism 4 is installed in the installation hole. The return mechanism \alpha includes a guide post 401. A sliding sleeve 402 is sleeved outside the guide post 401. The sliding sleeve 402 is in interference connection with the inner side wall of the installation hole. One end of the guide post 40\alpha is threadedly connected to the piston 2. The other end of the guide post 401 is fixedly connected with a first spring seat 403. A second spring seat 404 and a return spring 405 are sleeved outside the guide post 401. The second spring seat 40\alpha is slidably matched with the guide post 401. One end of the second spring seat 404 abuts against the sliding sleeve 402. The other end of the second spring seat 404 abuts against the return spring 405. The other end of the return spring 405 abuts against the first spring seat 403.
[0024] When the vehicle brakes, the hydraulic pressure in the hydraulic chamber 3 increases. The hydraulic oil pushes the piston 2 to move towards the brake disc. The piston 2 drives the guide post 401 to move. The first spring seat 403 compresses the return spring 405 until the brake pad 7 is in close contact with the brake disc, and the vehicle speed gradually decreases. After the vehicle braking is completed, the hydraulic pressure in the hydraulic chamber 3 decreases. The return spring 405 extends and reversely pushes the first spring seat 403 to drive the guide post 401 and the piston 2 to move away from the brake disc, and separates the brake pad 7 from the brake disc quickly. When the return spring 405 is compressed, the return spring 405 generates an axial thrust on the sliding sleeve 402. When the axial thrust does not exceed the friction force between the sliding sleeve 402 and the inner wall of the mounting hole, the sliding sleeve 402 will not move. When the axial thrust exceeds the friction force between the sliding sleeve 402 and the inner wall of the mounting hole, the sliding sleeve 402 moves outwards along the axis of the mounting hole.
[0025] In this embodiment, a boss 4011 is provided on the outer circumferential surface of the guide post 401. One end face of the boss 4011 abuts against the piston 2, and the other end face of the boss 4011 is in separable contact with the sliding sleeve 402. The boss 4011 serves as a mounting and positioning reference. Specifically, when the guide post 401 and the piston 2 are assembled, after the boss 4011 abuts against the piston 2, it indicates that the guide post 401 has been installed in place.
[0026] In this embodiment, an opening is provided on the side surface of the sliding sleeve 402. The opening extends along the axis of the sliding sleeve 402 and penetrates both end faces of the sliding sleeve 402. Specifically, when implemented, the outer diameter of the sliding sleeve 402 in the natural state is slightly larger than the inner diameter of the mounting hole. Due to the opening provided on the side surface of the sliding sleeve 402, the sliding sleeve 402 can be compressed to a certain extent in the radial direction. After the sliding sleeve 402 is assembled in the mounting hole, it has a tendency to expand outwards in the radial direction and applies a certain force to the inner side wall of the mounting hole, thereby forming an interference fit connection relationship between the two.
[0027] In this embodiment, an oil inlet 5 is provided in the hydraulic chamber 3. The oil inlet 5 is communicated with the brake oil pump of the vehicle.
[0028] In this embodiment, a sealing ring 6 is installed on the inner side surface of the housing 1 that is in sliding contact with the piston 2 to enhance the sealing effect of the hydraulic chamber 3.
[0029] In this embodiment, a brake pad 7 is installed on the outer end surface of the piston 2 connected with the guide post 401. Specifically, the brake pad 7 is made of a wear-resistant material with a high friction coefficient.
[0030] When this embodiment is in use, after stepping on the brake pedal, the hydraulic oil in the brake oil pump enters the hydraulic chamber 3 from the oil inlet 5. The pressure in the hydraulic chamber 3 gradually increases and pushes the piston 2 and the brake pad 7 to move. When the brake pad 7 is in close contact with the vehicle's brake disc, the rotational speed of the wheel gradually decreases under the action of friction. After releasing the brake pedal, the hydraulic oil flows back from the hydraulic chamber 3, the pressure in the hydraulic chamber 3 decreases, and the piston 2 quickly returns to its original position under the action of the return spring 405. The brake pad 7 disengages from the brake disc and the braking ends.
[0031] As the usage time and frequency of the brake increase, the thickness of the brake pad 7 gradually becomes thinner, and the gap between the brake pad 7 and the brake disc becomes larger. To ensure good braking performance, at this time, it is necessary to increase the amplitude of stepping on the brake pedal to increase the moving stroke of the piston 2 so that the brake pad 7 can be in close contact with the brake disc. As the pressure in the hydraulic chamber 3 continuously increases, the distance that the piston 2 is pushed out continuously increases, and the return spring 405 is gradually compressed. The thrust exerted by the return spring 405 on the sliding sleeve 402 through the second spring seat 404 gradually becomes larger. When the thrust of the return spring 405 exceeds the friction force between the sliding sleeve 402 and the inner wall of the mounting hole, the sliding sleeve 402 will generate a certain displacement along the side close to the brake disc. This displacement makes the initial position of the piston 2 after braking ends and returns to its original position closer to the brake disc, thereby compensating for the increased gap between the brake pad 7 and the brake disc.
[0032] The specific implementation manners of the present utility model described above do not constitute a limitation to the protection scope of the present utility model. Any other corresponding changes and deformations made according to the technical concept of the present utility model shall be included in the protection scope of the claims of the present utility model.
Claims
1. An automatic clearance compensating brake, comprising a housing and a piston slidably connected to the housing, wherein a hydraulic chamber for accommodating hydraulic oil is provided between the housing and the piston, and is characterized in that, An installation hole is provided on the end face of the housing, and a return mechanism is installed in the installation hole. The return mechanism includes a guide post, and a sliding sleeve is sleeved outside the guide post. The sliding sleeve is in interference connection with the inner side wall of the installation hole. One end of the guide post is threadedly connected to the piston, and the other end of the guide post is fixedly connected with a first spring seat. A second spring seat and a return spring are sleeved outside the guide post. One end of the second spring seat abuts against the sliding sleeve, and the other end of the second spring seat abuts against the return spring. The second spring seat is in sliding fit with the guide post, and the other end of the return spring abuts against the first spring seat.
2. The automatic clearance compensating brake according to claim 1, wherein A boss is provided on the outer circumferential surface of the guide post. One end face of the boss abuts against the piston, and the other end face of the boss is in separable contact with the sliding sleeve.
3. The automatic clearance compensating brake according to claim 1, wherein An opening is provided on the side surface of the sliding sleeve. The opening extends along the axial direction of the sliding sleeve and penetrates through the two end faces of the sliding sleeve.
4. The automatic clearance compensation brake according to claim 1, characterized in that, An oil inlet is provided in the hydraulic chamber, and the oil inlet is communicated with the brake oil pump of the vehicle.
5. An automatic clearance compensating brake according to claim 1, characterized in that, A sealing ring is installed on the side surface of the housing that is in sliding contact with the piston.
6. The automatic clearance compensating brake according to claim 1, wherein A brake pad is installed on the outer end surface of the guide post connected to the piston.