Air cut-off brake

Abstract

The utility model relates to an air cut-off brake, and belongs to the technical field of air cut-off brakes. Comprising a parking / stopping brake chamber, a service brake chamber and a hydraulic brake cylinder, an oil can is arranged above the hydraulic brake cylinder, an air chamber piston and a plunger push rod which are connected are arranged in the parking / stopping brake chamber, an air chamber rubber leather film and a push rod disc body are arranged on the right side of the plunger push rod, and a hollow plunger is arranged on the right side of the push rod disc body. A spring is arranged on the outer side of the hollow plunger, a positioning end socket is arranged at the right end of the hollow plunger, and double O-shaped sealing rings, a Y-shaped sealing ring and a nylon guide supporting ring are sequentially arranged between the inner wall of the hydraulic brake cylinder and the hollow plunger. A traditional solid push rod type structure is changed into the hollow plunger, the self weight of equipment is reduced, the manufacturing cost is reduced, the heat conductivity is reduced through the hollow plunger structure, and the working temperature in a hydraulic brake cavity is reduced; the supporting and guiding points extending from the nylon supporting and guiding ring support the eccentric jacking force of the hollow plunger during operation, the eccentric wear of the O-shaped sealing ring and the Y-shaped sealing ring is reduced, and the service life is prolonged.

Description

Technical Field

[0001] This utility model relates to an air brake, belonging to the technical field of air brakes. Background Technology

[0002] Air brakes are a type of handbrake system used in medium and large-sized vehicles. Although widely used in heavy vehicles, their short seal life is a significant drawback. This short seal life leads to a series of problems, such as decreased braking reliability (seal failure causes air pressure leakage, resulting in delayed braking response or even sudden brake failure); increased maintenance costs (frequent seal replacement increases labor and spare parts costs, and vehicle downtime causes economic losses); and safety hazards (seal failure can trigger sudden brake failure, posing a particularly high risk on inclines or at high speeds). The short seal life is due to the high temperatures generated during pneumatic system operation (such as frequent braking causing compressed air to heat up), the hardening and failure of seals in low winter temperatures, and the aging of the same sealing material under long-term oxidation or oil corrosion. Therefore, designing an air brake system is crucial. Utility Model Content

[0003] This utility model addresses the shortcomings of the existing technology by providing an air-stop brake.

[0004] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0005] An air brake includes a parking / stop brake chamber, a service brake chamber, and a hydraulic brake cylinder. An oil reservoir is located above the hydraulic brake cylinder. The parking / stop brake chamber contains a connected chamber piston and a plunger push rod. A chamber rubber diaphragm and a push rod disc are located on the right side of the plunger push rod. A hollow plunger is located on the right side of the push rod disc. A spring is located on the outer side of the hollow plunger, and a positioning end cap is located at its right end. A double O-ring seal, a Y-ring seal, and a nylon guide ring are sequentially arranged between the inner wall of the hydraulic brake cylinder and the hollow plunger.

[0006] Furthermore, a nylon guide collar is provided on the side of the air chamber piston that contacts the parking / stop braking air chamber.

[0007] Furthermore, an air chamber sealing ring is provided on the outer side of the nylon guide collar, and the air chamber sealing ring is located on the contact side between the air chamber piston and the parking / stop braking air chamber.

[0008] Furthermore, a breather is provided on the outside of the service brake chamber.

[0009] Furthermore, the axial centerlines of the conversion lever, plunger push rod, hollow plunger, and hydraulic brake cylinder are the same.

[0010] Furthermore, the oil reservoir is equipped with an oil circuit control valve.

[0011] Furthermore, the right end of the plunger push rod is provided with a double sealing ring.

[0012] Further, the hydraulic brake cylinder right end is equipped with an oil outlet joint.

[0013] Further, the plunger push rod is internally equipped with a conversion pull rod.

[0014] Compared with the prior art, the utility model has the beneficial effects that:

[0015] The hollow plunger is changed from the traditional solid core push rod type structure, the self weight of the equipment is reduced, the manufacturing cost is reduced, the hollow plunger outer diameter is thicker than the original solid structure outer diameter, the stability in the working movement of the hollow plunger is greatly increased, the structure of the hollow plunger reduces the heat conductivity, the working temperature in the hydraulic brake cavity is reduced, the hydraulic brake cylinder is internally equipped with the sealing structure of double O type sealing rings, Y type sealing rings and nylon guide rings, different sealing structure forms jointly undertake the working operation of the hollow plunger, the drawbacks of the same structure, same material and same service life of the sealing part are avoided, the guide point of the nylon guide ring extension supports the eccentric force in the working operation of the hollow plunger, the eccentric wear of the O type sealing ring and the Y type sealing ring is reduced, the service life is prolonged, the precise cooperation of the oil way control valve and the positioning head controls the oil demand of the hydraulic brake cylinder, the sealing structure is strict, the pressure generation is guaranteed, and the risk of leakage is eliminated, through the setting of the breather, the air circulation of the service brake chamber is guaranteed, the entry of dust and dirty gas is greatly reduced, and the service life is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 It is a structural schematic view of the utility model.

[0017] Fig. 2 It is a structural schematic view of the utility model.

[0018] In the drawing, 1, parking brake air chamber;11, air chamber piston;12, air chamber sealing rubber ring;13, nylon guide sleeve ring;2, conversion pull rod;3, plunger push rod;31, sealing rubber ring;4, push rod disc body;41, air chamber rubber film;5, hollow plunger;51, O type sealing ring;52, Y type sealing ring;53, nylon guide ring;54, positioning head;55, breather;6, oil can;7, hydraulic brake cylinder;8, service brake chamber. DETAILED DESCRIPTION

[0019] The principles and characteristics of the utility model are described below in combination with the drawings, and the examples are only used to explain the utility model and not used to limit the scope of the utility model.

[0020] As Figs. 1-2The air brake of the embodiment includes a parking / stop air chamber 1, a service brake chamber 8, and a hydraulic brake cylinder 7. The hydraulic brake cylinder 7 is provided with an oil can 6 above. The parking / stop air chamber 1 is provided with an air chamber piston 11 and a plunger push rod 3 connected with each other. The plunger push rod 3 is provided with an air chamber rubber film 41 and a push rod disc body 4 on the right side. The push rod disc body 4 is provided with a hollow plunger 5 on the right side. The hollow plunger 5 is provided with a spring outside and a positioning head 54 on the right end. The inner wall of the hydraulic brake cylinder 7 and the hollow plunger 5 are sequentially provided with a double O-shaped sealing ring 51, a Y-shaped sealing ring 52, and a nylon guide ring 53.

[0021] The air chamber piston 11 is provided with a nylon guide sleeve ring 13 on the contact side with the parking / stop air chamber 1.

[0022] The nylon guide sleeve ring 13 is provided with an air chamber sealing rubber ring 12 outside. The air chamber sealing rubber ring 12 is located on the contact side of the air chamber piston 11 with the parking / stop air chamber 1.

[0023] The service brake chamber 8 is provided with a breather 55 outside.

[0024] The axial center lines of the conversion pull rod 2, the plunger push rod 3, the hollow plunger 5, and the hydraulic brake cylinder 7 are the same.

[0025] The oil can 6 is provided with an oil path control valve inside.

[0026] The plunger push rod 3 is provided with a double sealing rubber ring 31 on the right end.

[0027] The hydraulic brake cylinder 7 is provided with an oil outlet joint on the right end.

[0028] The plunger push rod 3 is provided with a conversion pull rod 2 inside.

[0029] When the vehicle is running, the compressed air enters the parking / stop air chamber 1 through the air pipe by the accessory hand control valve, the compression of the air chamber spring and the air chamber piston 11 drives the plunger push rod 3 to move backward and into the air chamber, the service brake chamber brake push rod disc body 4 is moved, under the action of the brake chamber return spring, the hollow plunger 5 for brake is in a non-working state. At the same time, the positioning head 54 at the top end of the hollow plunger 5 piston pulls off the valve rod at the control valve assembly, and the brake oil in the oil can 6 is injected into the hydraulic brake cylinder 7 by high pressure difference flow.

[0030] When braking is needed during driving, the foot brake pedal is stepped on, compressed gas enters the service brake chamber 8 through the air pipe, pushes the rubber diaphragm 41, pushes the brake push rod disc 4, and drives the hollow plunger 5 to move forward; during the movement, the positioning head 54 at the top of the hollow plunger 5 is separated from the oil valve at the control valve assembly, and under the action of the spring above the control valve assembly, the oil valve body at the control valve assembly blocks the oil path between the hydraulic cylinder body and the oil canister 6, and under the condition of gradually increasing pressure, the oil path is tightly sealed, so that the hydraulic brake cylinder 7 forms a sealed pressure cylinder body; with the movement of the hollow plunger 5, the oil outlet connector at the top of the hydraulic brake cylinder 7 is connected with the wheel cylinder, the wheel cylinder is driven to work, and the hydraulic braking force required for braking is generated, so that the braking requirement is met.

[0031] When the vehicle needs to be parked, the compressed gas in the parking storage chamber is released through the accessory hand control valve, so that the spring of the storage chamber pushes the air chamber piston 11 under the action of the spring, drives the plunger push rod 3, pushes the brake push rod disc 4 and the hollow plunger 5 of the service brake chamber 8, and the piston moves forward, so that the brake fluid is compressed and power is transmitted, and the parking brake is realized.

[0032] The hollow plunger 5 is used to replace the traditional solid push rod structure, which reduces the weight of the equipment and the manufacturing cost, the increased diameter of the hollow plunger 5 greatly increases the stability of the hollow plunger 5 during operation, the structure of the hollow plunger 5 reduces heat conduction and the working temperature in the hydraulic brake cavity; the sealing structure of the double O-shaped sealing ring 51, the Y-shaped sealing ring 52 and the nylon guide ring 53 is arranged in the hydraulic brake cylinder 7, different sealing structures jointly bear the operation of the hollow plunger 5, avoid the defects of the same structure, same material and same service life of the sealing part, the extension of the guide point of the nylon guide ring 53 supports the biasing force during the operation of the hollow plunger 5, reduces the biasing of the O-shaped sealing ring 51 and the Y-shaped sealing ring 52, prolongs the service life, the precise cooperation of the oil control valve and the positioning head 54 controls the oil demand of the hydraulic brake cylinder 7, the tight sealing structure ensures the generation of pressure and eliminates the risk of leakage; the breather 55 is arranged to ensure the air circulation of the service brake chamber 8, greatly reduces the entry of dust and dirty gas, and prolongs the service life.

[0033] The above only describes the preferred embodiments of the present application, and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A kind of gas brake, including stop / stop brake chamber (1), service brake chamber (8) and hydraulic brake cylinder (7), oil can (6) is equipped above hydraulic brake cylinder (7), the stop / stop brake chamber (1) is equipped with the chamber piston (11) and plunger push rod (3) being connected, plunger push rod (3) right side is equipped with chamber rubber film (41) and push rod disc body (4), it is characterized by: The push rod disc body (4) is provided with a hollow plunger (5) on the right side, the outer side of the hollow plunger (5) is provided with a spring, the right end is provided with a positioning head (54), and the inner wall of the hydraulic brake cylinder (7) and the hollow plunger (5) are sequentially provided with a double O-shaped sealing ring (51), a Y-shaped sealing ring (52) and a nylon guide ring (53).

2. The gaseous efflux brake according to claim 1, wherein: The gas chamber piston (11) is provided with a nylon guide ring (13) on the contact side of the parking / stop brake gas chamber (1).

3. The gas-discharge brake according to claim 2, characterized in that: The outer side of the nylon guide ring (13) is provided with a gas chamber sealing leather ring (12), and the gas chamber sealing leather ring (12) is located on the contact side of the gas chamber piston (11) and the parking / stop brake gas chamber (1).

4. The squib brake of claim 1, wherein: The outside of the service brake chamber (8) is provided with a breather (55).

5. The gas-discharge brake according to claim 1, characterized in that: The oil can (6) is provided with an oil path control valve.

6. The gas-discharge brake according to claim 1, characterized in that: The right end of the plunger push rod (3) is provided with a double sealing rubber ring (31).

7. The gas-discharge brake according to claim 1, characterized in that: The right end of the hydraulic brake cylinder (7) is provided with an oil outlet joint.

8. The gas-discharge brake of claim 1, wherein: The plunger push rod (3) is internally provided with a conversion pull rod (2).

9. The gas-discharge brake according to claim 8, characterized in that: The axial center lines of the conversion pull rod (2), the plunger push rod (3), the hollow plunger (5) and the hydraulic brake cylinder (7) are the same.

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