CN107575512B - Friction plate return mechanism and air pressure disc brake with same - Google Patents
Friction plate return mechanism and air pressure disc brake with same Download PDFInfo
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- CN107575512B CN107575512B CN201710679799.5A CN201710679799A CN107575512B CN 107575512 B CN107575512 B CN 107575512B CN 201710679799 A CN201710679799 A CN 201710679799A CN 107575512 B CN107575512 B CN 107575512B
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- 238000009423 ventilation Methods 0.000 claims abstract description 22
- 239000002912 waste gas Substances 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 description 7
- 210000003437 trachea Anatomy 0.000 description 5
- 238000005299 abrasion Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 238000002054 transplantation Methods 0.000 description 1
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Abstract
The invention aims to provide a friction plate return mechanism which is simple in structure and does not influence the braking driving force of a friction plate and an air disc brake with the return mechanism. The friction plate return mechanism comprises an air pipe, two friction plates which are oppositely arranged and can relatively move and a brake disc positioned between the two friction plates; the friction plate is provided with a ventilation pipeline, one side of the ventilation pipeline, which is back to the brake disc, is an air inlet section extending along the motion direction of the friction plate, and one side of the ventilation pipeline, which faces the brake disc, is an air outlet section; the air pipe extends into the air inlet section of the ventilation pipeline from the outer side of the friction plate. The air storage tank in the air disc brake is connected with the air inlet of the brake distribution valve, the air outlet of the brake distribution valve is connected with the brake air chamber, the brake distribution valve is controlled by the brake pedal, and the caliper is driven by compressed air, so that friction plates are driven to move relatively, and braking is realized; the key point is that the air inlet end of the air pipe of the friction plate return mechanism is connected with the waste gas outlet of the brake distribution valve.
Description
Technical Field
The invention belongs to the technical field of automobile chassis brake application, and particularly relates to an automobile brake system.
Background
With the development of technology, air disc brakes are increasingly used on large commercial vehicles to replace conventional drum brakes. Compared with a drum brake, the air pressure disc brake has better stability and heat fading performance. The only disadvantage is that the friction plate of the air disc brake adopts natural return, the friction plate is driven back by the rotation of the brake disc, and the structure of active return is not adopted, so that the following problems are caused: drag and abrasion always exist between the friction plate and the brake disc, which causes a series of problems of friction plate abrasion, noise, oil consumption increase and the like.
In order to solve the above problems, technicians add a return mechanism for a friction plate on an air disc brake, mainly using a spring to control the return of the friction plate, such as "the air disc brake and an active return method for the friction plate" disclosed in patent No. 201510437414.5, and "an automatic return device for the air disc brake" disclosed in patent No. 201420665802.X, but this way increases the air pressure of a brake air chamber required during braking (because the elastic force of the return spring needs to be overcome), and makes the assembly of the air disc brake more complicated, so that the air disc brake is difficult to popularize and use.
Disclosure of Invention
The first purpose of the invention is to provide a friction plate return mechanism which has a simple structure and does not influence the braking driving force of the friction plate.
The friction plate return mechanism comprises an air pipe, two friction plates which are oppositely arranged and can relatively move and a brake disc positioned between the two friction plates; the friction plate is provided with a ventilation pipeline, one side of the ventilation pipeline, which is back to the brake disc, is an air inlet section extending along the motion direction of the friction plate, and one side of the ventilation pipeline, which faces the brake disc, is an air outlet section; the air pipe extends into the air inlet section of the ventilation pipeline from the outer side of the friction plate.
The return principle of the friction plate return mechanism is as follows:
be connected trachea and air supply, when the air supply air feed, gaseous from the trachea blowin vent line to finally blow to the brake disc along vent line, the air current can only flow along the clearance between brake disc and the friction disc, because the brake disc is immovable, the reaction force of consequently air current can promote the friction disc and remove to the direction of keeping away from the brake disc, realizes the function of friction disc return. In addition, because the air inlet section extends along the movement direction of the friction plate, the air pipe does not influence the movement of the friction plate. The air pipe in the friction plate return mechanism is not in direct contact with the friction plate, so that the safety is not influenced, and the work of the brake system is not influenced even if the return system fails.
Further, vent line's the section of giving vent to anger is horn mouth column structure, and this horn mouth column structure can utilize vent line tip's chamfer to form, and horn mouth column structure can make and form a cavity between friction disc and the brake disc, and when needs friction disc return, tracheal air current can flow into this cavity relatively fast in, exerts great reaction force to the lateral wall of cavity (the medial surface of friction disc) in the air current diffusion process, promotes the friction disc return.
Furthermore, the air outlet sections of the ventilation pipelines on the two friction plates are opposite in position, so that the two friction plates are consistent in return action.
Furthermore, the diameter of the air pipe is slightly smaller than that of the air inlet section of the vent pipeline, so that the amount of gas flowing to the outer side of the friction plate from the gap between the air pipe and the vent pipeline is reduced, and the acting force of pushing the friction plate to return by the gas is improved.
Further, the vent line is of a straight tubular structure, the diameter of the air pipe is larger than that of the air outlet section of the vent line, so that the flow speed of air flow at the air outlet section of the vent line can be increased, the return acting force of air acting on the friction plate is increased, in addition, when the friction plate returns to a preset position, the air outlet section of the vent line is abutted against the air pipe, and the air pipe can also play a role in limiting the friction plate.
The second purpose of the invention is to provide an air disc brake with the friction plate return mechanism.
The air pressure disc type brake of the invention has the following structure: the air storage tank in the air pressure disc brake is connected with the air inlet of a brake distribution valve, the air outlet of the brake distribution valve is connected with a brake air chamber, the brake distribution valve is controlled by a brake pedal, and the caliper is driven by compressed air, so that friction plates are driven to move relatively, and braking is realized; the key point is that the air inlet end of the air pipe of the friction plate return mechanism is connected with the waste gas outlet of the brake distribution valve.
The working principle of the air pressure disc brake is as follows:
and (3) braking process: when a driver steps on a brake pedal, an A-B channel in the brake distribution valve is opened, compressed gas stored in the gas storage tank enters a brake chamber through a pipeline, and two friction plates are pushed by a brake caliper to be attached to a brake disc, so that braking is realized.
A return process: when braking is finished and a driver releases a pedal, a B-C channel of the brake distribution valve is opened, compressed air in the brake air chamber flows to an exhaust gas outlet through the brake distribution valve through a pipeline, then the air is blown to the brake disc through an air pipe and an air vent pipeline in the friction plate, because the brake disc is fixed and the friction plate is floating, the friction plate moves towards the direction far away from the brake disc under the action of the reaction force of air flow, and active return is realized. In the return process, the airflow also has a cooling effect on the friction plate.
The air pressure disc brake utilizes the characteristic that residual air (namely high-pressure air in a brake air chamber) needs to be released after the air pressure brake system brakes, the residual air is introduced between a friction plate and a brake disc through a pipeline, air flow directly blows to the brake disc, the friction plate is pushed back by utilizing the reaction force of the action of the air flow, and the return is realized, so that the active return of the friction plate can be realized once after the braking is finished each time.
Furthermore, air pipes corresponding to the two friction plates are connected with a main air pipe through a three-way valve, the main air pipe is connected with a waste gas outlet of the brake distribution valve, and therefore the two friction plates are stressed simultaneously, and return is performed synchronously, so that the situation that return cannot be performed due to the fact that a single friction plate is fast to return and the other friction plate cannot be supplied with sufficient air flow is avoided.
The friction plate return mechanism has the advantages of simple structure, low cost and high safety, is suitable for all air pressure disc brakes, can realize quick transplantation in new products, and can also reform the existing products; the air disc brake adopting the friction plate return mechanism realizes the automatic return function on the premise of not increasing additional equipment and influencing the braking driving force of the friction plate, thereby solving the problem of drag grinding between the friction plate and the brake disc and prolonging the service life of the friction plate.
Drawings
Fig. 1 is a schematic structural diagram of a friction plate return mechanism of the present invention.
Fig. 2 is a cross-sectional view of the friction plate return mechanism of the present invention (arrows in the figure indicate the air flow direction).
Fig. 3 is a diagrammatic view of the air disc brake system of the present invention.
The figures are numbered: 1. an air tube; 2. a friction plate; 3. a brake disc; 4. a vent line; 5. a gas storage tank; 6. a brake distribution valve; 7. a brake chamber; 8. a brake pedal; 9. a caliper; 10. a three-way valve; 11. a main air pipe.
Detailed Description
The following describes embodiments of the present invention, such as shapes and structures of respective members, mutual positions and connection relationships between respective portions, and actions and operation principles of the respective portions, in further detail, with reference to the accompanying drawings.
Example 1:
as shown in fig. 1 and 2, the friction plate returning mechanism of the present embodiment is composed of an air pipe 1, two friction plates 2 which are oppositely arranged and can relatively move, and a brake disc 3 which is positioned between the two friction plates 2; a straight cylindrical ventilation pipeline 4 penetrates through each friction plate 2, and the ventilation pipelines 4 on the two friction plates 2 are opposite in position; the ventilation pipeline 4 extends along the movement direction of the friction plate 2, the diameter of the air pipe 1 is slightly smaller than that of the ventilation pipeline 4, the air pipe 1 extends into the ventilation pipeline 4 from the outer side of the friction plate 2, and one side, facing the brake disc 3, of the ventilation pipeline 4 is of a horn-mouth-shaped structure. In this embodiment, the air pipes 1 corresponding to the two friction plates are connected to the main air pipe 11 through the three-way valve 10.
The return principle of the return mechanism of the friction plate 2 is as follows:
be connected trachea 1 and air supply, when the air supply air feed, gaseous from trachea 1 insufflate vent pipe way 4 to finally blow to brake disc 3 along vent pipe way 4, the air current can only flow along the clearance between brake disc 3 and the friction disc 2, because brake disc 3 is immovable, the reaction force of consequently air current can promote friction disc 2 and remove to the direction of keeping away from brake disc 3, realizes the function of 2 resets of friction disc. In addition, because the air inlet section extends along the movement direction of the friction plate 2, the air pipe 1 does not influence the movement of the friction plate 2. The air pipe 1 in the return mechanism of the friction plate 2 is not in direct contact with the friction plate 2, so that the safety is not influenced, and the work of the brake system is not influenced even if the return system fails.
The section of giving vent to anger of air pipe 4 adopts horn mouth column structure, can make and form a cavity between friction disc 2 and the brake disc 3, and when needs friction disc 2 return, the air current of trachea 1 can flow into in this cavity relatively fast, exerts great reaction force to the lateral wall of cavity (the medial surface of friction disc 2) in the air current diffusion process, promotes friction disc 2 return.
The pneumatic disc brake of the present embodiment is structured as follows: an air storage tank 5 in the air disc brake is connected with an air inlet (port A) of a brake distribution valve 6, an air outlet (port B) of the brake distribution valve 6 is connected with a brake air chamber 7, the brake distribution valve 6 is controlled by a brake pedal 8, and calipers 9 are driven by compressed air, so that friction plates 2 are driven to move relatively to realize braking; the air pipes 1 corresponding to the two friction plates 2 are connected with a main air pipe 11 through a three-way valve 10, and the main air pipe 11 is connected with an exhaust gas outlet (opening C) of the brake distribution valve 6. The connection relationship among the air storage tank 5, the brake distribution valve 6, the brake air chamber 7, the brake pedal 8, the caliper 9 and the friction plate 2 is the same as that of the traditional air disc brake, and the description is omitted here.
The working principle of the air pressure disc brake is as follows:
and (3) braking process: when a driver steps on a brake pedal 8 and opens an A-B channel in a brake distribution valve 6, compressed gas stored in a gas storage tank 5 enters a brake chamber 7 through a pipeline, and two friction plates 2 are pushed by a brake caliper 9, so that the friction plates 2 are attached to a brake disc 3, and braking is realized.
A return process: when braking is finished, after a driver releases a brake pedal 8, a B-C channel of a brake distribution valve 6 is opened, compressed air in a brake air chamber 7 flows to an exhaust gas outlet through the brake distribution valve 6 through a pipeline, then the compressed air is blown to a brake disc 3 through an air pipe 1 and an air vent pipeline 4 in a friction plate 2, the brake disc 3 is fixed, the friction plate 2 is floating, and under the action of the reaction force of air flow, the friction plate 2 moves in the direction far away from the brake disc 3, so that active return is realized. In the return process, the air flow also has a cooling effect on the friction plate 2.
Therefore, the two friction plates are stressed simultaneously, so that the return is also carried out synchronously, and the situation that the return cannot be carried out due to the fact that the single friction plate returns quickly and the other friction plate cannot be supplied with sufficient air flow is avoided.
Claims (5)
1. A friction plate return mechanism is characterized by comprising an air pipe, two friction plates which are oppositely arranged and can relatively move and a brake disc positioned between the two friction plates; the friction plate is provided with a ventilation pipeline with a straight cylindrical structure, one side of the ventilation pipeline, which is back to the brake disc, is an air inlet section extending along the motion direction of the friction plate, and one side of the ventilation pipeline, which faces the brake disc, is an air outlet section; the diameter of the air pipe is slightly smaller than that of the air inlet section of the ventilation pipeline, the air pipe extends into the air inlet section of the ventilation pipeline from the outer side of the friction plate, and the air pipe is not in direct contact with the ventilation pipeline.
2. The friction plate return mechanism of claim 1, wherein the vent passage has a flared outlet section.
3. The friction plate return mechanism of claim 1, wherein the air outlet sections of the ventilation ducts of the two friction plates are located opposite to each other.
4. The air disc brake with the friction plate return mechanism as claimed in claim 1, wherein an air storage tank in the air disc brake is connected with an air inlet of a brake distribution valve, an air outlet of the brake distribution valve is connected with a brake air chamber, the brake distribution valve is controlled by a brake pedal, and calipers are driven by compressed air so as to drive the friction plates to move relatively to realize braking; the brake device is characterized in that the air inlet end of an air pipe of the friction plate return mechanism is connected with a waste gas outlet of the brake distribution valve.
5. The air disc brake of claim 4, wherein the corresponding air pipes of the two friction plates are connected with a main air pipe through a three-way valve, and the main air pipe is connected with an exhaust gas outlet of the brake distribution valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710679799.5A CN107575512B (en) | 2017-08-10 | 2017-08-10 | Friction plate return mechanism and air pressure disc brake with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710679799.5A CN107575512B (en) | 2017-08-10 | 2017-08-10 | Friction plate return mechanism and air pressure disc brake with same |
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| Publication Number | Publication Date |
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| CN107575512A CN107575512A (en) | 2018-01-12 |
| CN107575512B true CN107575512B (en) | 2021-08-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710679799.5A Active CN107575512B (en) | 2017-08-10 | 2017-08-10 | Friction plate return mechanism and air pressure disc brake with same |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109139745A (en) * | 2018-09-30 | 2019-01-04 | 四川德胜集团钒钛有限公司 | A kind of cold shears brake |
| CN113815586B (en) * | 2020-06-18 | 2023-03-24 | 比亚迪股份有限公司 | Brake system and brake system control method |
| CN113819167A (en) * | 2020-06-18 | 2021-12-21 | 比亚迪股份有限公司 | Braking return device |
| CN113815579B (en) * | 2020-06-18 | 2024-02-27 | 比亚迪股份有限公司 | Braking device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB799577A (en) * | 1953-11-28 | 1958-08-13 | Otto Hilger | Improvements in or relating to disk brakes for vehicles, in particular for motor vehicles |
| US3862675A (en) * | 1973-08-15 | 1975-01-28 | Bendix Corp | Fluid injection antiskid brake system |
| KR100521205B1 (en) * | 2003-11-06 | 2005-10-17 | 현대자동차주식회사 | Pad return device of brake system in vehicle |
| CN205136432U (en) * | 2015-12-03 | 2016-04-06 | 泉州市力将机件企业有限公司 | But rapid cooling's dish is stopped |
| CN206125050U (en) * | 2016-08-09 | 2017-04-26 | 山东科技大学 | Vapour -pressure type electrical mining locomotive braking control device |
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