Dustproof plug for double-diaphragm brake chamber

Abstract

The dustproof plug for the double-diaphragm brake chamber comprises a dustproof plug body installed on the brake chamber, the brake chamber comprises a lower barrel, an exhaust hole is formed in the center of the bottom of the lower barrel, the dustproof plug body is installed at the exhaust hole, and a roundabout air channel used for balancing internal air pressure and external air pressure is arranged in the dustproof plug body. The problem that in the prior art, a parking cavity is directly communicated with the outside atmosphere is solved, a round air hole in a lower cylinder in the prior art is omitted, an exhaust hole and a dustproof plug matched with the exhaust hole are designed, a roundabout air channel is arranged in the dustproof plug, and dust, soil, silt and other impurity particles on the road surface can be effectively blocked through the roundabout air channel; safety and reliability of a vehicle brake system are guaranteed, and the service life of the double-diaphragm brake chamber is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of brake chamber technology, specifically to a dust plug for a dual-diaphragm brake chamber. Background Technology

[0002] The brake chamber is part of a car's braking system. Its function is to convert the pressure of compressed air into the mechanical force that applies the brakes. Figure 1 As shown, the existing dual-diaphragm brake chamber has four circular air holes 1 on its lower cylinder. The interior of the lower cylinder is the parking chamber, in which a parking spring and a diaphragm are installed. When the parking spring is compressed, the gas in the parking chamber is discharged through the circular air holes 1 to release the parking brake. When gas enters through the circular air holes 1, the parking spring returns to its original position to apply the parking brake. In the existing technology, in the harsh environment of the trailer, particles such as mud, sand, and gravel may enter the parking chamber through the circular air holes 1. Over time, moisture and impurities will continuously enter the parking chamber, corroding the parking spring. In particular, mud, sand, and gravel will affect the normal use of the diaphragm. Damage to the diaphragm will cause air leakage into the brake chamber, resulting in product scrap. Summary of the Invention

[0003] The purpose of this invention is to provide a dust plug for a dual-diaphragm brake chamber to solve the problems mentioned in the background art. It eliminates the four circular air holes on the lower cylinder and replaces them with a single exhaust hole combined with a dust plug. In particular, the dust plug has a meandering air passage inside, which can prevent particles such as mud, sand and gravel from entering the parking chamber and increase the service life of the brake chamber.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a dust plug for a dual-diaphragm brake chamber, comprising a dust plug installed on the brake chamber, the brake chamber comprising a lower cylinder, wherein an exhaust hole is opened at the center of the bottom of the lower cylinder, the dust plug is installed at the exhaust hole, and a meandering air passage for balancing the internal and external air pressure is provided inside the dust plug.

[0005] Preferably, the dust plug includes a vent valve body and a vent cap. The vent valve body includes a gas collecting section that communicates with the inner cavity of the lower cylinder. One end of the gas collecting section is provided with a gas distributing section that communicates with its air passage. The upper end face of the gas distributing section abuts against the inner wall of the vent cap. The gas collecting section and the gas distributing section form a chamber A. The upper end face of the gas distributing section is evenly provided with four notches. The airflow from the gas collecting section to the notches is the first section of a meandering air passage.

[0006] Preferably, the vent valve body is further provided with a base, which is located between the air distribution section and the air collection section and is designed radially along the air distribution section and the air collection section. Four insertion holes are evenly distributed on the base, and the insertion holes cooperate with the insertion pins corresponding to the end face of the vent cap. After the insertion holes and insertion pins are engaged, the end face of the vent cap and the surface of the base are closed without gaps, and a chamber B is formed between the air distribution section and the vent cap. Four vents are also evenly provided on the end face of the vent cap, and the airflow from the notch to the vent is the second section of the detour airway.

[0007] Preferably, the outer wall of the vent cap is provided with an arched protrusion corresponding to the vent, and the outer edge of the base is provided with a raised bottom plate corresponding to the arched protrusion. The raised bottom plate and the arched protrusion cooperate to form a vent, and the port surface of the vent is set at an angle.

[0008] Furthermore, the gas collecting part, the gas distributing part, and the base are integrally molded, the gas collecting part and the gas distributing part are cylindrical, and the cross-section of the vent cap is an isosceles trapezoidal structure.

[0009] Furthermore, the vent valve body and vent cap are covered with a rubber and plastic sleeve, which is integrally injection molded, leaving air ports for the air collection part and four air ports for the venting part during the injection molding process.

[0010] Preferably, the rubber sleeve is provided with a barbed protrusion at the port position of the gas collecting part. The barbed protrusion cooperates with the exhaust hole of the lower cylinder. After the barbed protrusion enters the exhaust hole of the lower cylinder, the part of the rubber sleeve outside the gas collecting part is close to the exhaust hole.

[0011] Preferably, the rubber and plastic sleeve is further provided with an integrally molded structure of an annular wall and an extension. The annular wall is located outside the air port of the ventilation section and is designed vertically. One end of the extension is located on the outer surface of the annular wall, and the other end is provided with a round hole. An expansion buckle is installed in the round hole. The lower cylinder is provided with a mounting hole near the exhaust port, and the mounting hole cooperates with the expansion buckle.

[0012] Furthermore, both the mounting hole and the vent hole are circular structures, with the diameter of the mounting hole being much smaller than that of the vent hole.

[0013] Compared with the prior art, the beneficial effects of the present invention are: it solves the problem that the parking chamber is directly connected to the outside atmosphere in the prior art, eliminates the circular air hole on the lower cylinder in the prior art, and designs an exhaust hole and a dust plug that works with it. The dust plug has a built-in meandering air passage, which can effectively block dust, mud, sand and other impurities on the road surface, ensuring the safety and reliability of the vehicle braking system, ensuring the service life of the dual diaphragm brake chamber, and the dust plug is also easy to replace. Attached Figure Description

[0014] Figure 1This is a schematic diagram of the brake chamber structure in the prior art;

[0015] Figure 2 This is a schematic diagram of the double diaphragm brake air chamber structure with dust plug of the present invention;

[0016] Figure 3 This is a partial cross-sectional view of the dual-diaphragm brake chamber of the present invention;

[0017] Figure 4 This is a partial cross-sectional view of the double diaphragm brake chamber with dust plug of the present invention;

[0018] Figure 5 This is a schematic diagram of the exploded structure of the dust plug of the present invention;

[0019] Figure 6 This is a schematic diagram of the vent valve body and vent cap of the present invention when closed.

[0020] In the diagram: 1. Circular vent; 2. Dust plug; 3. Lower cylinder; 4. Exhaust port; 5. Parking chamber; 6. Vent valve body; 7. Vent cap; 8. Gas collection section; 9. Gas distribution section; 10. Notch; 11. Base; 12. Parking spring; 13. Insertion hole; 14. Insertion pin; 15. Vent port; 16. Arched protrusion; 17. Protruding base plate; 18. Vent section; 19. Rubber and plastic sleeve; 20. Barbed protrusion; 21. Annular wall; 22. Extension section; 23. Expansion buckle; 24. Mounting hole; A and B are chambers A and B for gas flow, respectively. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figure 1-6 A dust plug for a dual-diaphragm brake chamber includes a dust plug 2 installed on the brake chamber. The brake chamber includes a lower cylinder 3, with an exhaust hole 4 at the center of the bottom of the lower cylinder 3. The dust plug 2 is installed at the exhaust hole 4. The dust plug 2 has a meandering air passage for balancing the internal and external air pressure. The dual-diaphragm brake chamber of this patent eliminates the circular air hole 1. The balance between the parking chamber 5 inside the lower cylinder 3 and the external air pressure is achieved through the dust plug 2. The dust plug 2 adopts a meandering air passage design, which can prevent particles such as mud, sand and gravel from entering the parking chamber 5.

[0023] The dust plug 2 includes a vent valve body 6 and a vent cap 7. The vent valve body 6 includes an air collecting part 8 that connects to the inner cavity of the lower cylinder 3, that is, the inner parking cavity 5 of the lower cylinder 3 connects to the air passage in the air collecting part 8. One end of the air collecting part 8 is provided with an air distribution part 9 that connects to its air passage. The air collecting part 8 and the air distribution part 9 adopt a cylindrical structure. The upper end face of the air distribution part 9 abuts against the inner wall of the vent cap 7. The interior of the air collecting part 8 and the air distribution part 9 forms a chamber A. The upper end face of the air distribution part 9 is evenly provided with four notches 10. Because the upper end face of the air distribution part 9 is in contact with the inner wall of the vent cap 7, the airflow can only flow through the four notches 10. The airflow from the air collecting part 8 to the notches 10 is the first section of the detour air passage.

[0024] The vent valve body 6 is also provided with a base 11, which is located between the air distribution section 9 and the air collection section 8 and is designed radially along the air distribution section 9 and the air collection section 8. The air collection section 8, the air distribution section 9 and the base 6 are integrally formed. Four insertion holes 13 are evenly distributed on the base 6. The insertion holes 13 cooperate with the insertion pins 14 on the end face of the corresponding vent cap 7. After the insertion holes 13 and the insertion pins 14 are engaged, the end face of the vent cap 7 is closed with the surface of the base 11 without gaps. The cross-section of the vent cap 7 is an isosceles trapezoidal structure. A chamber B is formed between the air distribution section 9 and the vent cap 7. The chamber B is connected to the chamber A through four notches 10. Four vents 15 are also evenly provided on the end face of the vent cap 7. Because after the end face of the vent cap 7 is closed with the surface of the base 11, the airflow can only flow through the four vents 15. The airflow from the notch 10 to the vent 15 is the second section of the detour airway.

[0025] An arched protrusion 16 is provided on the outer wall of the vent cap 7 corresponding to the vent 15. A raised base plate 17 is provided on the outer edge of the base 11 corresponding to the arched protrusion 16. The raised base plate 17 and the arched protrusion 16 cooperate to form a vent 18. As long as the insertion hole 13 and the insertion pin 14 are engaged, the raised base plate 17 and the arched protrusion 16 will also close to form the vent 18. The vent 18 is connected to the outside atmosphere. That is to say, when the parking chamber 5 is inlet or outlet, the outside atmosphere and the parking chamber 5 must pass through the first and second sections of the detour air passage. This structure not only disperses the airflow, but also the detour air passage design greatly ensures the cleanliness of the parking chamber 5.

[0026] The vent valve body 6 and the vent cap 7 are covered with a rubber and plastic sleeve 19. The rubber and plastic sleeve 19 is integrally injection molded. During the injection molding, the air port of the air collection part 8 and the air ports of the four vent parts 18 are left. The rubber and plastic sleeve 19 is provided with a barbed protrusion 20 corresponding to the port position of the air collection part 8. The barbed protrusion 20 cooperates with the exhaust hole 4 of the lower cylinder 3. After the barbed protrusion 20 enters the exhaust hole 4 of the lower cylinder 3, the part of the rubber and plastic sleeve 19 outside the air collection part 8 is close to the exhaust hole 4.

[0027] The rubber-plastic sleeve 19 also features an integrally molded annular wall 21 and an extension 22. The annular wall 21 is located outside the air inlet of the vent 18. The port face of the vent 18 is inclined, and the annular wall 21 is designed vertically. This design prevents external air from directly entering the vent 18 horizontally, but only through the dust plug 2. One end of the extension 22 is located on the outer surface of the annular wall 21, and the other end has a circular hole. An expansion buckle 23 is installed in the circular hole. The lower cylinder 3 has an installation hole 24 near the exhaust port 4. The installation hole 24 cooperates with the expansion buckle 23. Both the installation hole 24 and the exhaust port 23 are circular structures. The diameter of the installation hole 24 is much smaller than that of the exhaust port 23. The purpose of the installation hole 24 is to cooperate with the expansion buckle 23 to prevent the dust plug 2 from falling off.

[0028] Assembly principle: The dust plug 2 of this patent is installed on the lower cylinder 3. The exhaust hole 4 on the lower cylinder 3 and the barbed protrusion 20 of the gas collecting part 8 cooperate. After the barbed protrusion 20 is inserted into the exhaust hole 4, the inner wall of the lower cylinder 3 will limit the barbed protrusion 20, thus installing the dust plug 2. The dust plug 2 is also provided with an extension part 22. An expansion buckle 23 is provided on one end of the extension part 22. The expansion buckle 23 cooperates with the mounting hole 24 on the lower cylinder 3 to prevent the dust plug 2 from falling off.

[0029] Working principle: State 1: When the parking brake is applied, the parking spring 12 returns to its original position, and the parking chamber 5 is filled with air. The outside airflow enters through the four vents 18 and enters the B chamber. The airflow in the B chamber enters the A chamber through the four gaps 10. Finally, the airflow in the A chamber flows to the parking chamber 5, achieving an internal and external air pressure balance.

[0030] State 2: When the parking brake is released, the parking spring 12 is compressed, the parking chamber 5 is vented, and the airflow in the parking chamber enters the A chamber. The airflow in the A chamber flows to the B chamber through the four notches 10. The airflow in the B chamber finally flows to the outside atmosphere through the four vents 18, achieving an internal and external air pressure balance.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A dust plug for a double diaphragm brake chamber comprising a dust plug mounted on a brake chamber, the brake chamber comprising a lower cylinder, characterised in that: The lower cylinder bottom center position is provided with an exhaust hole, and the dustproof plug is installed at the exhaust hole.

2. The dust plug for a double diaphragm brake chamber of claim 1, wherein: The dustproof plug comprises a ventilation valve body and a ventilation cap, the ventilation valve body comprises a gas collecting part communicating with the inner cavity of the lower cylinder, one end of the gas collecting part is provided with a gas distributing part communicating with the gas channel thereof, the upper end face of the gas distributing part abuts against the inner wall of the ventilation cap, the inside of the gas collecting part and the gas distributing part forms an A chamber, and the upper end face of the gas distributing part is uniformly provided with four notches, and the airflow from the gas collecting part to the notches is the first section of the circuitous air channel.

3. The dust plug for a double diaphragm brake chamber of claim 2, wherein: The ventilation valve body is further provided with a base, the base is located between the gas distributing part and the gas collecting part and is designed along the radial direction of the gas distributing part and the gas collecting part, the base is uniformly provided with four insertion holes, the insertion holes are matched with the insertion pins corresponding to the end face of the ventilation cap, after the insertion holes and the insertion pins are buckled, the end face of the ventilation cap is combined with the surface of the base without gap, the B chamber is formed between the gas distributing part and the ventilation cap, and the end face of the ventilation cap is further uniformly provided with four ventilation openings, and the airflow from the notches to the ventilation openings is the second section of the circuitous air channel.

4. The dust plug for a double diaphragm brake chamber of claim 3, wherein: The outer wall of the ventilation cap is provided with an arched protrusion corresponding to the ventilation opening, the outer edge of the base is provided with a protruding bottom plate corresponding to the arched protrusion, and the protruding bottom plate and the arched protrusion cooperatively form a ventilation part, and the end face of the ventilation part is provided as an inclined surface.

5. The dust plug for a dual diaphragm brake chamber of claim 3, wherein: The gas collecting part, the gas distributing part and the base adopt an integral molding structure, the gas collecting part and the gas distributing part adopt a cylindrical structure, and the cross section of the ventilation cap adopts an isosceles trapezoidal structure.

6. A dust plug for a dual diaphragm brake chamber as defined in claim 4, wherein: The ventilation valve body and the ventilation cap are provided with an oplastic sleeve, the oplastic sleeve is integrally injection molded, and the gas port of the gas collecting part and the gas ports of the four ventilation parts are left in the injection molding.

7. A dust plug for a dual diaphragm brake chamber according to claim 6, wherein: The oplastic sleeve is provided with a barb protrusion corresponding to the port position of the gas collecting part, the barb protrusion is matched with the exhaust hole of the lower cylinder, after the barb protrusion enters the exhaust hole of the lower cylinder, the part of the oplastic sleeve outside the gas collecting part is tightly attached to the exhaust hole.

8. The dust plug for a dual diaphragm brake chamber of claim 6, wherein: The oplastic sleeve is further provided with an integral molding structure of a ring wall and an extension, the ring wall is located outside the gas port of the ventilation part and is designed as a vertical type, one end of the extension is provided at the outer surface of the ring wall, the other end is provided with a circular hole, an expansion buckle is installed in the circular hole, and the lower cylinder is provided with a mounting hole near the exhaust hole, and the mounting hole is matched with the expansion buckle.

9. The dust plug for a dual diaphragm brake chamber of claim 8, wherein: The mounting hole and the exhaust hole are circular structures, and the hole diameter of the mounting hole is much smaller than the hole diameter of the exhaust hole.

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