Brake chamber

Abstract

The present invention discloses a brake chamber, comprising: a cylinder body having a partition body for dividing the space into a front chamber and a rear chamber therein; the push rod hermetically penetrates through the front end of the cavity and can axially move front and back, the rear end of the push rod is connected with a push disc, and the push rod is provided with a front cavity elastic reset piece used for driving the push rod to move backwards and reset; the piston assembly is arranged in the rear cavity in a front-back moving mode and provided with a pushing part which penetrates through the separation body in a sealing mode and pushes the pushing disc forwards in the parking state. The barrel is arranged in the front cavity, and the outer wall of the barrel and the inner wall of the cylinder body are sealed and in sliding fit; the inner surrounding edge and the outer surrounding edge of the elastic membrane are connected with the edge of the push disc and the rear end of the barrel in a sealed mode respectively, and the elastic membrane, the barrel and the push disc divide the front cavity into a front matching cavity located on the front side and a traveling cavity located on the rear side. The invention has the beneficial effects that the elastic component can be prevented from being easily aged and damaged, and the service life is prolonged.

Description

Technical Field

[0001] This invention relates to a brake chamber, mainly focusing on the optimized design of elastic components in the brake chamber that are prone to aging and damage. Background Technology

[0002] The brake chamber, also known as the brake caliper, is the core actuator of an automotive air brake system. Its main function is to convert compressed air pressure into mechanical thrust, thereby driving the brakes to decelerate or stop the vehicle. In a traditional brake chamber structure, it typically includes a cylinder, pushrod, push disc, return spring, and diaphragm. Its basic working principle involves two modes: service braking and parking braking. During service braking, compressed air is filled into the service chamber of the brake chamber. The high-pressure gas acts on one side of the diaphragm, forcing it to undergo significant elastic deformation. This tensions and pushes the connected push disc and pushrod forward, outputting braking force. During parking braking, the compressed air in the parking chamber is released, causing the piston assembly under spring force to move forward. The pusher at the piston's front end directly presses against the diaphragm, thereby pushing the push disc and pushrod to achieve parking lock.

[0003] However, this traditional structure has the following technical drawbacks: The diaphragm, as the core transmission and sealing element, is constantly subjected to direct compression by high-pressure gas during service braking, requiring significant deformation to drive the push plate. During parking braking, the diaphragm not only needs to deform again, but its localized areas (especially the central area) are also subjected to large, concentrated clamping forces from the pushing components and the push plate, subsequently being forcibly tensioned as the push plate moves. This causes the diaphragm to repeatedly endure extreme mechanical stress and deformation in both main operating modes. Especially under parking conditions, the superimposed clamping and tensioning effects greatly exacerbate the fatigue, aging, localized wear, and even tearing of the diaphragm material, severely affecting the service life and reliability of the brake chamber, increasing vehicle maintenance costs and safety hazards. Summary of the Invention

[0004] The purpose of this invention is to provide a brake chamber that can prevent elastic components from aging and being easily damaged, thus extending their service life.

[0005] The present invention is achieved through the following technical solution.

[0006] A brake chamber, comprising:

[0007] The cylinder block has an internal partition that divides the space into a front chamber and a rear chamber;

[0008] The push rod passes through the front end of the front cavity in a sealed manner and can move axially back and forth. Its rear end is connected to a push plate. The push rod is equipped with a front cavity elastic reset element, which is used to drive the push rod to move backward and reset.

[0009] The piston assembly is movable back and forth in the rear chamber and has a pusher that seals through the partition and pushes the push plate forward in the parked state.

[0010] The cylinder body is located in the front cavity, and its outer wall and the inner wall of the cylinder body are sealed and slidingly fitted.

[0011] The elastic diaphragm has its inner and outer edges sealed to the edge of the push plate and the rear end of the cylinder, respectively. Together with the cylinder and the push plate, it divides the front cavity into a front mating cavity on the front side and a traveling cavity on the rear side. The elastic diaphragm is used to deform under pressure when high-pressure gas is injected into the traveling cavity, and pulls the push plate forward to widen the gap between it and the separator.

[0012] As a further improvement of the present invention, the rear end of the cylinder is formed with a radially inward portion that matches the shape of the front wall of the separator. A rear sealing ring is arranged around the outer wall of the cylinder. The rear end of the rear sealing ring has a bifurcated outer lip that seals against the inner wall of the cylinder and an inner lip that seals against the outer wall of the cylinder. The outer lip and inner lip of the rear sealing ring are adapted to increase the force of the seal against the inner wall of the cylinder and the outer wall of the cylinder respectively when high-pressure gas is injected into the travel chamber, so as to increase the forward movement resistance of the cylinder.

[0013] As a further improvement of the present invention, the piston assembly includes a piston body and a rear chamber elastic reset member disposed in the piston body. The outer wall of the piston body and the inner wall of the cylinder are sealed and slidably fitted. The rear chamber is divided into a parking chamber located on the front side and a rear mating chamber located on the rear side. A pushing member is connected to the front end of the piston body. The rear chamber elastic reset member is used to drive the piston body forward. The parking chamber is used to release high-pressure gas in the parking state and cause the piston body to move forward.

[0014] As a further improvement of the present invention, it also includes a venting tube, the two ends of which are respectively connected to the front mating chamber and the rear mating chamber.

[0015] As a further improvement of the present invention, a front sealing ring is provided around the outer wall of the cylinder, located in front of the rear sealing ring. The front end of the front sealing ring has a bifurcated outer lip that seals against the inner wall of the cylinder and an inner lip that seals against the outer wall of the cylinder. The outer lip and inner lip of the front sealing ring are adapted to increase the force of the seal against the inner wall of the cylinder and the outer wall of the cylinder respectively when high-pressure gas is injected into the traveling cavity to increase the air pressure in the front mating cavity, thereby increasing the forward movement resistance of the cylinder.

[0016] As a further improvement of the present invention, a guide ring is provided around the outer wall of the cylinder, and the outer edge of the guide ring slides in conjunction with the inner wall of the cylinder.

[0017] As a further improvement of the present invention, the guide ring is located between the front sealing ring and the rear sealing ring.

[0018] As a further improvement of the present invention, the portion of the elastic diaphragm corresponding to its outer edge is held by the cylinder and the clamping ring, and the three are fixedly connected by a plurality of circumferentially spaced fasteners.

[0019] As a further improvement of the present invention, the portion of the elastic diaphragm corresponding to its inner perimeter is held by a pusher and a clamping ring, and the three are fixedly connected by a plurality of circumferentially spaced fasteners.

[0020] The beneficial effects of this invention are:

[0021] By introducing a cylinder and redesigning the connection and stress distribution of the elastic diaphragm, the diaphragm, after being compressed and deformed during the initial stage of driving braking to widen the gap between the push plate and the separator, shares the gas pressure with the push plate, rather than bearing high-pressure compression alone throughout the entire process. This significantly reduces the deformation and damage to the elastic diaphragm during driving. During parking braking, the pushing component acts directly on the push plate, and the elastic diaphragm is only slightly deformed by the push plate, completely avoiding the severe mechanical damage caused by being pressed by the pushing component or being tensioned after being clamped by the push plate. This solution significantly reduces the stress burden and deformation range of the elastic diaphragm from the root causes of the two main operating conditions: driving and parking, thereby greatly extending its service life. Attached Figure Description

[0022] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings to aid in understanding the objectives and advantages of the present invention, wherein:

[0023] Figure 1 This is a cross-sectional schematic diagram of the brake chamber;

[0024] Figure 2 for Figure 1 A magnified view of part A in the diagram. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0026] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the construction shown in the accompanying drawings. The terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively. These are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive.

[0027] This embodiment illustrates a brake chamber that can effectively extend the service life of an elastic diaphragm, referring to... Figure 1 and Figure 2The brake chamber mainly includes a cylinder body 1, a push rod 21, a piston assembly, a cylinder body 22, and an elastic diaphragm 23. The cylinder body 1 serves as the main structure, and an internal partition 11 divides its interior into a front chamber and a rear chamber. The push rod 21, which outputs mechanical thrust, seals through the front wall of the cylinder body 1 and can move axially back and forth within the cylinder body 1. A push plate 24 is connected to the rear end of the push rod 21 inside the cylinder body 1. To enable the push rod 21 to automatically reset in the non-braking state, a front chamber elastic reset member 25 is configured to continuously apply an elastic force that drives the push rod 21 to move backward and reset. The piston assembly is movable back and forth within the rear chamber and has a pushing component 32 that sealably penetrates the aforementioned partition 11. When the vehicle is in parking brake mode, the piston assembly moves forward, and the pushing component 32 at its front end directly pushes the pusher plate 24 forward. The cylinder 22 is disposed within the front chamber, and its outer wall is sealed to the inner wall of the cylinder 1 through a sealing structure, allowing for relative sliding contact. The elastic diaphragm 23 is a sealing and transmission element made of a flexible elastic material and is annular in shape with a certain radial width. Its inner edge is sealed to the edge of the pusher plate 24, and its outer edge is sealed to the rear end of the cylinder 22. Through this connection, the elastic diaphragm 23, the cylinder 22, and the pusher plate 24 further divide the front chamber into two sub-chambers: one is the front mating chamber r3 located at the foremost side, and the other is the driving chamber r1 located behind the front mating chamber r3.

[0028] When service braking is required, high-pressure gas is injected into the service cavity r1. Under the pressure of the high-pressure gas, the elastic diaphragm 23 undergoes forced deformation, and its deformation pulls the push plate 24 and the cylinder 22 connected to it forward, thereby creating a certain gap between the push plate 24 and the front wall of the partition 11. In the initial state when the push rod 21 is not braking, the push plate 24 and the elastic diaphragm 23 are basically attached to the front wall of the partition 11, and the space of the service cavity r1 enclosed by the elastic diaphragm 23, the cylinder 22 and the push plate 24 is very small. When service braking begins, when high-pressure gas is injected into this narrow service cavity r1, because the elastic diaphragm 23 itself is an elastic material, it will quickly deform forward (i.e. towards the front end of the cylinder 1) under the compression of the high-pressure gas. This initial, rapid indentation deformation process directly pulls the cylinder 22 and the pusher plate 24 forward, creating a gap between the pusher plate 24 and the separator 11. This gap provides space for the high-pressure gas to act on the rear surface of the pusher plate 24. Once the gap is formed, the high-pressure gas can act on the rear side of the elastic diaphragm 23 and the rear surface of the pusher plate 24 simultaneously. Therefore, the elastic diaphragm 23 mainly bears a large force and undergoes significant deformation in the initial stage of high-pressure gas injection to create the gap. Once the gap is formed, the pusher plate 24 begins to mainly bear the gas pressure and drive the pusher rod 21, and the force and subsequent deformation of the elastic diaphragm 23 are relatively reduced. This is fundamentally different from the working mode of the diaphragm in the prior art, which is continuously squeezed by high-pressure gas and undergoes large deformation throughout the entire braking process, thus significantly reducing the fatigue damage of the elastic diaphragm 23 during a single braking process. On the other hand, during parking brake operation, the piston assembly moves forward under control, and its front-end pushing component 32 directly acts on the push plate 24 (instead of acting on the diaphragm first as in existing technologies), pushing the push plate 24 forward. During this process, the elastic diaphragm 23 is merely passively pulled forward by the forward movement of the push plate 24, causing the cylinder 22 to follow suit; its own deformation is minimal. This completely avoids the severe mechanical damage caused by the push component 32 first pressing down on, or even clamping together with the push plate 24, the central area of ​​the air film during parking brake operation, and then forcibly stretching the air film to deform it, as in existing technologies. In summary, this embodiment, by setting the cylinder 22 and reconfiguring the connection and force distribution of the elastic diaphragm 23, allows the elastic diaphragm 23 to assume the "opening" role during the initial stage of service brake operation and then share the pressure with the push plate 24. During parking brake operation, it bears almost no damage from clamping and stretching, significantly reducing the stress burden and deformation range of the elastic diaphragm 23 from the two most important operating conditions, thereby greatly extending its service life.

[0029] In this embodiment, to further enhance the protective effect of the brake chamber on the elastic diaphragm 23 during vehicle braking, a rear sealing ring 41 is arranged around the outer wall of the cylinder 22. This rear sealing ring 41 has a bifurcated structure at its rear end (i.e., the side facing the driving chamber r1), forming an outer lip 4a and an inner lip 4b. The outer lip 4a is sealed against the inner wall of the cylinder 1, and the inner lip 4b is sealed against the outer wall of the cylinder 22, thus forming a Y-shaped structure in cross-section. When high-pressure gas is injected into the driving chamber r1 for vehicle braking, the high-pressure gas acts not only on the push plate 24 and the elastic diaphragm 23 but also on the area where the rear end of the rear sealing ring 41 is located. Under the action of gas pressure, the degree of bifurcation between the outer lip 4a and the inner lip 4b of the rear sealing ring 41 increases, meaning that the outer lip 4a and the inner lip 4b are pressed more tightly against the inner wall of the cylinder 1 and the outer wall of the cylinder 22, respectively, under pressure. First, it significantly enhances the dynamic sealing effect of the travel chamber r1 at that location, ensuring that high-pressure gas does not leak from the sliding gap between the cylinder 22 and the cylinder body 1, thus guaranteeing the effective establishment of braking force. Second, and more importantly, the increased contact force between the lip and the contact surface directly leads to an increase in frictional resistance. This increased frictional resistance increases the resistance to the forward movement of the cylinder 22. In the initial stage of service braking, when high-pressure gas is injected, the pusher 24 is hindered by the elastic force of the front cavity elastic reset member 25, and its forward movement itself has a certain resistance. At the same time, in order to adapt to the shape of the front wall of the separator 11 and avoid rigid collision, the rear end of the cylinder 22 forms a radially inward portion 221 that matches the shape of the front wall of the separator 11. The high-pressure gas also acts on this radially inward portion 221, generating a force that attempts to push the cylinder 22 forward. If the cylinder 22 moves forward too easily or too quickly under this force, while the pusher 24 moves forward relatively slowly due to the resistance of the reset component, a large relative displacement difference will occur between the cylinder 22 and the pusher 24. This displacement difference will force the elastic diaphragm 23 connected between the two to undergo excessive and unexpected tension deformation, which will accelerate its aging over time. This embodiment, by setting a rear sealing ring 41 with a special structure, uses the gas pressure itself to increase the frictional resistance of the sealing ring during high-pressure gas injection, thereby effectively suppressing the tendency of the cylinder 22 to move forward too quickly, reducing the forward displacement difference between the two, thereby reducing the degree of excessive stretching and deformation of the elastic diaphragm 23 due to the asynchronous movement of the two, strengthening the protection of the elastic diaphragm 23, and further improving its durability and the working reliability of the entire brake chamber.

[0030] In this embodiment, the piston assembly is the component that realizes the parking brake function. It includes a piston body 31 and a rear chamber elastic return member 33 disposed inside the piston body 31. The piston body 31 is a component that can slide back and forth in the rear chamber, and its outer wall is sealed and slidably engaged with the inner wall of the cylinder 1 through a sealing structure. The piston body 31 further divides the rear chamber into two chambers: a parking chamber r2 located on the front side of the piston body 31, and a rear engagement chamber r4 located on the rear side of the piston body 31. The pushing component 32, i.e., the component mentioned above for directly pushing the push plate 24 when parking, is connected to the front end of the piston body 31. The rear chamber elastic return member 33 is usually a spring installed inside the piston body 31, and its function is to provide an elastic force to drive the piston body 31 forward (i.e., toward the separator 11). When the vehicle is in normal driving condition, the parking chamber r2 is usually filled with high-pressure gas. This gas pressure overcomes the elastic force of the rear chamber elastic reset member 33, pushing the piston body 31 to the rear, so that the pushing member 32 does not push against the push plate 24. When parking brake needs to be applied, the control system releases the high-pressure gas in the parking chamber r2. At this time, the elastic force stored in the rear chamber elastic reset member 33 is released, driving the piston body 31 to move forward as a whole. The forward-moving piston body 31 drives the pushing member 32 at its front end to pass through the partition 11 and directly act on the push plate 24, thereby pushing the push plate 24 and the push rod 21 forward to achieve parking brake.

[0031] In this embodiment, a connecting structure is added to optimize the air pressure balance and response characteristics inside the brake chamber. Specifically, the brake chamber also includes a vent pipe 12, the two ends of which are connected to the front mating chamber r3 and the rear mating chamber r4, respectively. The front mating chamber r3 is located at the front of the front chamber and is surrounded by the cylinder 22, the front end of the cylinder 1, and a part of the elastic diaphragm 23; the rear mating chamber r4 is located at the rear of the rear chamber and is surrounded by the piston body 31 and the rear end of the cylinder 1. Through this vent pipe 12, these two originally physically separated chambers are connected, allowing the gas between them to flow freely. That is, in terms of air path relationship, the front mating chamber r3 and the rear mating chamber r4 actually form a mutually connected "common chamber".

[0032] In this embodiment, in order to apply a more comprehensive and progressive forward resistance to the cylinder 22 during vehicle braking, thereby achieving ultimate protection for the elastic diaphragm 23, a front sealing ring 42 is provided around the outer wall of the cylinder 22, located in front of the aforementioned rear sealing ring 41 (i.e., closer to the front end of the cylinder 1). Similar to the rear sealing ring 41, the front end of the front sealing ring 42 also has a bifurcated design, forming an outer lip 4a that seals against the inner wall of the cylinder 1, and an inner lip 4b that seals against the outer wall of the cylinder 22. Its cross-section is also Y-shaped, but its opening direction is opposite to that of the rear sealing ring 41 (the Y-shaped opening of the front sealing ring 42 faces forward, and the Y-shaped opening of the rear sealing ring 41 faces backward). When the service brake is activated, high-pressure gas is injected into the service cavity r1, pushing the pusher plate 24 forward. This forward movement of the pusher plate 24 compresses and reduces the volume of the front mating cavity r3. Since the front mating cavity r3 is connected to the rear mating cavity r4, and the volume of the rear mating cavity r4 remains constant, the gas pressure within the front mating cavity r3 increases. This increased pressure acts on the front end of the front sealing ring 42, further widening the bifurcation between the outer lip 4a and the inner lip 4b of the front sealing ring 42. Similar to the working principle of the rear sealing ring 41, this increased bifurcation leads to two results: first, the front sealing ring 42 fits more tightly against the inner wall of the cylinder 1 and the outer wall of the cylinder 22, enhancing the airtightness of the front mating cavity r3 at this location and preventing leakage of compressed high-pressure gas; second, it increases the frictional resistance between the outer lip 4a and the inner wall of the cylinder 1, and between the inner lip 4b and the outer wall of the cylinder 22. This newly added frictional resistance, together with the frictional resistance generated by the rear sealing ring 41, forms a combined force acting on the cylinder 22, further increasing the total resistance to the forward movement of the cylinder 22. Thus, in the initial stage of braking, the cylinder 22 is subjected to a forward thrust from the gas pressure of the rear travel chamber r1 (acting on the radially inward portion 221 of the cylinder 22), but simultaneously subjected to rearward frictional resistance from the front sealing ring 42 and the rear sealing ring 41 due to pressure changes. The superposition of these dual resistances further suppresses the forward movement of the cylinder 22. The synchronization of movement between the cylinder 22 and the push plate 24, which moves forward due to the resistance of the front chamber elastic reset member 25, is improved to a higher level, and the difference in their forward displacement is further reduced. As previously stated, the displacement difference between the cylinder 22 and the push plate 24 is the main cause of harmful tensile deformation of the elastic diaphragm 23 connecting them. Therefore, by adding a front sealing ring 42 and actively generating resistance by utilizing the natural physical phenomenon of increased air pressure in the front mating cavity r3, this embodiment can more effectively suppress the tension deformation of the elastic diaphragm 23 during vehicle braking, thereby protecting the elastic diaphragm 23 at a deeper level and minimizing its fatigue damage.

[0033] In this embodiment, to ensure the long-term, stable, and smooth axial movement of the cylinder 22 within the cylinder 1, and to prevent it from tilting or jamming, a guide ring 43 is arranged around the outer wall of the cylinder 22. The outer edge of the guide ring 43 directly contacts the inner wall of the cylinder 1 and forms a sliding fit. The guide ring 43 is typically made of engineering plastics or composite materials with low friction coefficient and high wear resistance. Its main function is to provide precise radial guidance and support for the reciprocating motion of the cylinder 22 within the cylinder 1, maintain the coaxiality between the cylinder 22 and the cylinder 1, and prevent the cylinder 22 from tilting, swaying, or experiencing dry metal-to-metal friction with the inner wall of the cylinder 1 due to uneven force during movement. This ensures the alignment of the entire moving component, allowing the moving assembly consisting of the pusher plate 24, the elastic diaphragm 23, and the cylinder 22 to move smoothly along a preset axis, reducing unnecessary mechanical resistance and wear.

[0034] In this embodiment, the guide ring 43 is positioned axially on the outer wall of the cylinder 22 between the front sealing ring 42 and the rear sealing ring 41. Placing the guide ring 43 between the two main sealing rings provides a stable radial support point in the middle of the cylinder 22, which effectively constrains the cylinder 22 and prevents minor swaying at both ends under the frictional force of the sealing rings, ensuring linearity of movement. The guide ring 43 axially separates the front and rear sealing rings 41, allowing the sealing and guiding functions to perform their respective duties while cooperating with each other: the front and rear sealing rings 41 focus on providing dynamic sealing and controllable frictional resistance, while the guide ring 43 focuses on ensuring smooth movement and centering. Together, they constitute an efficient, reliable, and durable cylinder 22 movement support and sealing system.

[0035] In this embodiment, the portion of the elastic diaphragm 23 corresponding to its outer edge is tightly clamped between the rear end of the cylinder 22 and the clamping ring d. During assembly, the outer edge of the elastic diaphragm 23 is laid flat on the radially inwardly tapering portion 221 at the rear end of the cylinder 22. Then, the clamping ring d is pressed onto the elastic diaphragm 23. Finally, multiple fasteners evenly spaced along the circumferential direction are sequentially inserted through the clamping ring d and the outer edge of the elastic diaphragm 23, thereby firmly fixing the three together. This connection method has significant advantages. Through the combined clamping of the clamping ring d and the rear end of the cylinder 22, a large-area, uniform pressure force can be formed on the outer edge of the elastic diaphragm 23, ensuring excellent sealing at this point and effectively preventing high-pressure gas in the travel chamber r1 from leaking from the connection. Furthermore, this detachable connection method greatly facilitates assembly, disassembly, and maintenance. When the elastic diaphragm 23 needs to be replaced, simply loosen the fasteners and remove the clamping ring d for replacement.

[0036] In this embodiment, the portion of the elastic diaphragm 23 corresponding to its inner perimeter is tightly clamped between the edge of the push plate 24 and another clamping ring d. The specific fixing method is similar to that of the outer perimeter connection: the inner perimeter of the elastic diaphragm 23 is placed at the mounting position on the edge of the push plate 24, and then covered by the clamping ring d. Finally, multiple fasteners evenly distributed along the circumferential direction are used to sequentially pass through the clamping ring d and the inner perimeter of the elastic diaphragm 23, and screwed into the threaded holes on the edge of the push plate 24, thereby firmly fixing the push plate 24, the inner perimeter of the elastic diaphragm 23, and the clamping ring d into a single unit.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A brake chamber, characterized in that, include: The cylinder block has an internal partition that divides the space into a front chamber and a rear chamber; A push rod, which is sealed through the front end of the front cavity and can move axially back and forth, has a push plate connected to its rear end. The push rod is equipped with a front cavity elastic reset member for driving the push rod to move backward and reset. A piston assembly, movable back and forth within the rear cavity, has a pusher that seals through the partition and pushes the push plate forward in the parked state; A cylindrical body is disposed within the front cavity, and its outer wall and the inner wall of the cylinder are sealed and slidably fitted together. An elastic diaphragm, with its inner and outer edges sealed to the edge of the pusher plate and the rear end of the cylinder, respectively, divides the front cavity into a front mating cavity on the front side and a traveling cavity on the rear side. The elastic diaphragm is used to deform under pressure when high-pressure gas is injected into the traveling cavity, and pulls the pusher plate forward to widen the gap between it and the separator.

2. The brake chamber according to claim 1, characterized in that, The rear end of the cylinder has a radially inward portion that matches the shape of the front wall of the separator. A rear sealing ring is arranged around the outer wall of the cylinder. The rear end of the rear sealing ring has a bifurcated outer lip that seals against the inner wall of the cylinder and an inner lip that seals against the outer wall of the cylinder. The outer lip and the inner lip of the rear sealing ring are adapted to increase the force of the seal against the inner wall of the cylinder and the outer wall of the cylinder respectively when high-pressure gas is injected into the traveling cavity, so as to increase the forward movement resistance of the cylinder.

3. The brake chamber according to claim 2, characterized in that, The piston assembly includes a piston body and a rear chamber elastic reset member disposed within the piston body. The outer wall of the piston body and the inner wall of the cylinder body are sealed and slidably fitted together, and the rear chamber is divided into a parking chamber located on the front side and a rear mating chamber located on the rear side. The pushing member is connected to the front end of the piston body. The rear chamber elastic reset member is used to drive the piston body forward. The parking chamber is used to release high-pressure gas in the parking state and cause the piston body to move forward.

4. The brake chamber according to claim 3, characterized in that, It also includes a ventilator, the two ends of which are connected to the front mating chamber and the rear mating chamber, respectively.

5. The brake chamber according to claim 4, characterized in that, A front sealing ring is arranged around the outer wall of the cylinder, located in front of the rear sealing ring. The front end of the front sealing ring has a forked outer lip that seals against the inner wall of the cylinder and an inner lip that seals against the outer wall of the cylinder. The outer lip and the inner lip of the front sealing ring are adapted to increase the force of the seal against the inner wall of the cylinder and the outer wall of the cylinder respectively when high-pressure gas is injected into the traveling cavity to increase the air pressure in the front mating cavity, thereby increasing the forward movement resistance of the cylinder.

6. The brake chamber according to claim 5, characterized in that, A guide ring is arranged around the outer wall of the cylinder, and the outer edge of the guide ring slides in conjunction with the inner wall of the cylinder.

7. The brake chamber according to claim 6, characterized in that, The guide ring is located between the front sealing ring and the rear sealing ring.

8. The brake chamber according to any one of claims 1-7, characterized in that, The portion of the elastic diaphragm corresponding to its outer edge is held by the cylinder and the clamping ring, and the three are fixedly connected by a plurality of circumferentially spaced fasteners.

9. The brake chamber according to any one of claims 1-7, characterized in that, The portion of the elastic diaphragm corresponding to its inner perimeter is held by the push plate and the clamping ring, and the three are fixedly connected by a plurality of circumferentially spaced fasteners.

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