Novel Y-shaped sealing ring piston type brake chamber

Abstract

The utility model relates to the field of brake chambers, in particular to a novel Y-shaped sealing ring piston type brake chamber which comprises a service brake chamber and a parking brake chamber, the parking brake chamber is provided with a piston and a piston rod, the piston is arranged in the parking brake chamber in a sliding mode, the piston rod is connected to the left side of the piston, and the Y-shaped sealing ring is arranged on the right side of the piston. A first groove is annularly formed in the outer portion of the right side of the piston, a Y-shaped sealing ring is arranged in the first groove, a sealing lip of the Y-shaped sealing ring is arranged in the mode that the outside is low and the inside is high, a second groove located at the right end of the first groove is annularly formed in the piston, and a sealing ring is arranged in the second groove. According to the design that the lips of the Y-shaped sealing ring on the outer side of the piston of the parking braking air chamber are low outside and high inside, stress distribution is changed, the lips on the inner side are tightly attached to the wall of the air chamber under pressure, inward turning deformation caused by uneven stress is reduced, and the service life of the sealing ring is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of brake chambers, and specifically to a novel Y-type sealing ring piston brake chamber. Background Technology

[0002] Piston-type brake chambers are widely used in vehicle braking systems, and their core structure includes service brake chambers and parking brake chambers. In the parking brake chamber, a Y-type sealing ring is usually fitted on the outside of the piston to achieve a seal and prevent gas leakage. The sealing lip of the traditional Y-type sealing ring is designed with an "outer high, inner low" (i.e., the outer height of the lip is greater than the inner height). During the reciprocating motion of the piston, under the influence of gas pressure and friction, the inner lip of the sealing ring is prone to inward deformation due to stress concentration, leading to seal failure. At the same time, the lip transition area and surface structure design of the traditional sealing ring are unreasonable, which easily leads to wear and fatigue, thereby shortening its service life and affecting the reliability of the braking system. Utility Model Content

[0003] To address the problems of the prior art, this utility model provides a novel Y-type sealing ring piston-type brake chamber.

[0004] The objective of this utility model can be achieved through the following technical solution: A novel Y-type sealing ring piston brake chamber includes a service brake chamber and a parking brake chamber. The parking brake chamber is provided with a piston and a piston rod. The piston is slidably disposed inside the parking brake chamber. The piston rod is connected to the left side of the piston. The outer ring on the right side of the piston is provided with a groove 1. A Y-type sealing ring is provided in the groove 1. The sealing lip of the Y-type sealing ring is set with the outer side lower than the inner side. The upper ring of the piston is provided with a groove 2 located at the right end of the groove 1. A sealing ring is provided in the groove 2.

[0005] In a further improvement, the sealing lip of the Y-shaped sealing ring includes an outer lip and an inner lip. The distance between the upper end face of the inner lip and the upper end face of the outer lip is a, and the range of a is 0.5mm to 1mm. The roots of the outer lip and the inner lip are connected by a curved transition. The outer side of the outer lip is provided with an arc-shaped groove one, and the inner side of the inner lip is provided with an arc-shaped groove two.

[0006] In a further improvement, the service brake chamber is provided with a diaphragm, which divides the service brake chamber into a push rod chamber and a service chamber. The push rod chamber is provided with a push rod, a return spring, and a push rod disc. The push rod extends to the outside of the left end of the service brake chamber. The push rod disc is connected to the right end of the push rod. The return spring is sleeved on the push rod. The internal cavity of the piston rod is provided with a parking brake release screw. The left end of the parking brake release screw is provided with a nut, which is located inside the internal cavity of the piston rod. The parking brake release screw extends to the outside of the right end of the parking brake chamber and is provided with a nut. The left end of the piston rod extends into the service chamber. The left end of the piston rod is provided with a balance valve assembly.

[0007] In a further improvement, a parking spring is fitted inside the right side of the piston, and the parking spring is located inside the parking brake chamber.

[0008] Compared with the prior art, the beneficial effects of this utility model's novel Y-type sealing ring piston-type brake chamber are as follows:

[0009] The "low outer, high inner" design of the Y-shaped seal ring on the outside of the parking brake chamber piston alters the stress distribution. Under pressure, the inner lip adheres tightly to the chamber wall, reducing inward deformation caused by uneven stress and extending the seal's lifespan. The low height design of the outer lip reduces friction, making the piston's reciprocating motion more flexible, reducing energy consumption and component wear. The double-groove structure (groove one for installing the Y-shaped seal ring and groove two for installing the sealing ring) forms a double sealing barrier, reducing the risk of gas leakage and improving the sealing performance of the parking brake chamber. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of the present invention.

[0011] Figure 2 This is a partially enlarged structural schematic diagram of the present invention.

[0012] Figure 3 This is a schematic diagram of the cross-section of the Y-shaped sealing ring in this utility model.

[0013] Figure 4 A schematic diagram of the cross-section of a Y-type sealing ring in the prior art.

[0014] In the diagram, 1-service brake chamber, 11-push rod, 12-return spring, 13-push rod disc, 14-diaphragm, 15-push rod cavity, 16-service chamber, 2-parking brake chamber, 21-piston, 211-groove one, 212-Y-type sealing ring, 2121-outer lip, 2122-inner lip, 2123-curved surface, 2124-arc groove one, 2125-arc groove two, 213-groove two, 214-sealing ring, 22-piston rod, 23-parking brake release screw, 231-nut one, 232-nut two, 24-balance valve assembly, 25-parking spring. Detailed Implementation

[0015] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model; unless otherwise expressly specified and limited, the terms "installed," "connected," and "joined" should be interpreted broadly, for example, they can refer to fixed connections or detachable connections, etc. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0016] The following is a description of the embodiments and appendices. Figures 1-4 The technical solution of this utility model will be further described below.

[0017] Example 1

[0018] A novel Y-type sealing ring piston brake chamber includes a service brake chamber 1 and a parking brake chamber 2. The parking brake chamber 2 is provided with a piston 21 and a piston rod 22. The piston 21 is slidably disposed inside the parking brake chamber 2. The piston rod 22 is connected to the left side of the piston 21. The outer ring of the right side of the piston 21 is provided with a first groove 211. A Y-type sealing ring 212 is provided in the first groove 211. The sealing lip of the Y-type sealing ring 212 is set with the outer side lower than the inner side. The piston 21 is provided with a second groove 213 located at the right end of the first groove 211. A sealing ring 214 is provided in the second groove 212.

[0019] As shown in the figure, the working principle of this utility model is as follows:

[0020] In the novel Y-type sealing ring piston brake chamber of Example 1, a groove is provided on the outer ring of the piston of the parking brake chamber, and a Y-type sealing ring is installed inside. The sealing lip is designed as "lower on the outside and higher on the inside" (i.e., the outer side of the lip is lower than the inner side). This design utilizes the characteristics of gas pressure distribution: when the parking brake chamber is filled with air, the gas pressure acts on the right side of the piston, pushing the piston to the left. At this time, the inner lip of the Y-type sealing ring, due to its higher height, has a larger contact area with the inner wall of the chamber, forming the main sealing surface; the outer lip, being lower, adheres tightly to the bottom and side wall of the groove under pressure, helping to restrict the radial movement of the sealing ring. Compared with the traditional "higher on the outside and lower on the inside" structure, the "lower on the outside and higher on the inside" lip ensures that the inner lip adheres tightly to the chamber wall under pressure when subjected to force, reducing the risk of inward flipping. At the same time, the lower height design of the outer lip reduces the frictional resistance with the inner wall of the chamber, making the piston movement smoother.

[0021] In addition, a sealing ring is installed in the second groove on the right side of the piston, which can further help fix the position of the Y-shaped sealing ring, prevent it from shifting axially under high pressure, and enhance sealing stability.

[0022] As a further preferred embodiment, the sealing lip of the Y-shaped sealing ring 212 includes an outer lip 2121 and an inner lip 2122. The distance between the upper end face of the inner lip 2122 and the upper end face of the outer lip 2121 is a, and the range of a is 0.5mm to 1mm. The roots of the outer lip 2121 and the inner lip 2122 are connected by a curved surface 2123. The outer side of the outer lip 2121 is provided with an arc-shaped groove 2124, and the inner side of the inner lip 2122 is provided with an arc-shaped groove 2125.

[0023] The sealing lip of the Y-type sealing ring is divided into an outer lip and an inner lip. The distance between the upper surfaces of the two (a = 0.5~1mm) forms an elastic pre-tightening space, which allows the lip to maintain slight contact with the air chamber wall when there is no pressure, providing an initial seal. The roots of the outer lip and the inner lip are connected by a curved transition, eliminating right-angle stress concentration points and improving the fatigue resistance of the sealing ring. The arc-shaped grooves on the outer side of the outer lip and the inner side of the inner lip (arc-shaped groove one and two) increase the flexibility of the lip, allowing it to adapt to deformation when the pressure changes, and maintain the sealing surface fit.

[0024] As a further preferred embodiment, the service brake chamber 1 is provided with a diaphragm 14, which divides the service brake chamber 1 into a push rod chamber 15 and a service chamber 16. The push rod chamber 15 is provided with a push rod 11, a return spring 12, and a push rod disc 13. The push rod 11 extends to the outside of the left end of the service brake chamber 1. The push rod disc 13 is connected to the right end of the push rod 11. The return spring 12 is sleeved on the push rod 11. The internal cavity of the piston rod 22 is provided with a parking brake release screw 23. The left end of the parking brake release screw 23 is provided with a nut 231, and the nut 231 is located in the internal cavity of the piston rod 22. The parking brake release screw 23 extends to the outside of the right end of the parking brake chamber 2 and is provided with a nut 232 at its end. The left end of the piston rod 22 extends into the service chamber 16. The left end of the piston rod 22 is provided with a balance valve assembly 24.

[0025] The diaphragm within the service brake chamber divides the cavity into a push rod chamber and a service chamber. The push rod chamber houses a push rod, a return spring, and a push rod disc, while the service chamber connects to the piston rod of the parking brake chamber. When the service brake is applied, compressed air enters the service chamber, pushing the diaphragm and push rod disc to the left, extending the push rod to achieve braking. The return spring pushes the push rod back to its original position after the brake is released. The parking brake release screw inside the piston rod passes through the piston, with a nut at the left end fixed to the piston rod cavity and a nut at the right end exposed. When the parking brake needs to be released (e.g., manually), rotating nut two moves the screw to the left, compressing the parking spring and achieving mechanical release. The balance valve assembly at the left end of the piston rod balances the pressure between the service chamber and the parking brake chamber, preventing mutual interference and ensuring accurate braking response.

[0026] As a further preferred embodiment, a parking spring 25 is sleeved inside the right side of the piston 21, and the parking spring 23 is located inside the parking brake air chamber 2.

[0027] The parking spring, internally fitted on the right side of the piston, is located in the parking brake air chamber. Initially compressed, it provides parking braking force. When the parking brake is inflated, the gas pressure overcomes the spring force, pushing the piston to the left to release the parking brake. When the gas is released, the spring force pushes the piston to the right, reactivating the parking brake. The spring's placement inside the piston shortens the axial dimension of the air chamber and guides the spring within the piston structure, preventing it from deflecting during compression.

[0028] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A novel Y-type sealing ring piston-type brake chamber, characterized in that, It includes a service brake chamber and a parking brake chamber. The parking brake chamber is equipped with a piston and a piston rod. The piston is slidably disposed inside the parking brake chamber. The piston rod is connected to the left side of the piston. The outer ring on the right side of the piston is provided with a groove 1. A Y-shaped sealing ring is provided in the groove 1. The sealing lip of the Y-shaped sealing ring is set with the outer side lower than the inner side. The upper ring of the piston is provided with a groove 2 located at the right end of the groove 1. A sealing ring is provided in the groove 2.

2. The novel Y-type sealing ring piston brake chamber according to claim 1, characterized in that, The sealing lip of the Y-shaped sealing ring includes an outer lip and an inner lip. The distance between the upper end face of the inner lip and the upper end face of the outer lip is a, and the range of a is 0.5mm to 1mm. The roots of the outer lip and the inner lip are connected by a curved transition. The outer side of the outer lip is provided with an arc-shaped groove one, and the inner side of the inner lip is provided with an arc-shaped groove two.

3. The novel Y-type sealing ring piston brake chamber according to claim 1, characterized in that, The service brake chamber is equipped with a diaphragm, which divides the service brake chamber into a push rod chamber and a service chamber. The push rod chamber is equipped with a push rod, a return spring, and a push rod disc. The push rod extends to the outside of the left end of the service brake chamber. The push rod disc is connected to the right end of the push rod. The return spring is sleeved on the push rod. The internal cavity of the piston rod is equipped with a parking brake release screw. The left end of the parking brake release screw is equipped with a nut, which is located inside the internal cavity of the piston rod. The parking brake release screw extends to the outside of the right end of the parking brake chamber and is equipped with a nut. The left end of the piston rod extends into the service chamber. The left end of the piston rod is equipped with a balance valve assembly.

4. A novel Y-type sealing ring piston-type brake chamber according to claim 1, characterized in that, A parking spring is fitted inside the right side of the piston, and the parking spring is located inside the parking brake chamber.

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