Brake chambers and commercial vehicles

Abstract

The present invention relates to the field of brake devices, specifically brake chambers and commercial vehicles; the brake chamber includes a service brake chamber constructed by a middle shell and a front end cover, the service brake chamber forms a high-pressure chamber and a normal-pressure chamber through a diaphragm, a rigid isolation cylinder and a sealing assembly, an isolation chamber is formed in the isolation cylinder, and the high-pressure chamber, the normal-pressure chamber and the isolation chamber are not connected to each other; the isolation cylinder is provided with a push rod, the two ends of the push rod are respectively a receiving end and an output end, the receiving end is confined in the isolation chamber, the output end is located outside the isolation chamber, and the output end passes through the brake through hole and is located outside the front end cover. By providing the isolation cylinder and the sealing assembly, the support sleeve in the prior art is replaced. Since the isolation cylinder is a rigid component, the pressure of the water pushed by the push disc cannot cause the isolation cylinder to rupture or deform; and under the condition that the sealing assembly seals the gap between the isolation cylinder and the brake through hole of the front end cover, the water in the normal-pressure chamber cannot flow into the brake through the movable path of the push rod.

Description

Technical Field

[0001] The present invention relates to the field of brake devices, in particular to brake chambers and commercial vehicles. Background Art

[0002] The prior art provides a patent document entitled "Dual-Piston Brake Chamber and Brake Chamber Kit" with application number 202422376356.7. This prior art proposes a dual-piston brake chamber having a driving chamber, a push rod, a first spring, a piston disc, and a support sleeve. When compressed gas is injected into the driving chamber, the piston disc pushes the first spring, the push rod, and the support sleeve, compressing the first spring and the support sleeve, respectively, and causing the push rod to move outward (outside the front cylinder head). When the pressure of the compressed gas in the driving chamber decreases, causing the elastic force of the first spring to exceed the pressure of the compressed gas, the first spring pushes the piston disc, causing the first spring and the support sleeve to relax, and causing the push rod to move inward (inside the front cylinder head).

[0003] In the above-mentioned prior art, if water enters the chamber between the front cylinder head and the piston disc, and when compressed air is injected into the driving chamber, the piston disc moves, causing the piston disc to squeeze the water located "between the front cylinder head and the piston disc". Since the water cannot be discharged from the front cylinder head in time, the water squeezes the support sleeve, causing the support sleeve to rupture; further, the water located "between the front cylinder head and the piston disc" reaches the brake located outside the front cylinder head through the movable path of the push rod, causing the internal mechanism of the brake to rust or even cause the brake to fail.

[0004] Therefore, how to prevent water from entering the brake through the active path of the push rod becomes a technical problem to be solved. Summary of the Invention

[0005] In order to solve the technical problem of how to prevent water from entering the brake through the active path of the push rod, the present invention provides a brake air chamber and a commercial vehicle.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] According to one aspect of the present invention, a brake air chamber is provided, comprising a service brake chamber constructed by a middle housing and a front end cover, wherein the service brake chamber is formed into a high-pressure chamber and a normal-pressure chamber by a diaphragm, a rigid isolation cylinder, and a sealing assembly, wherein an isolation chamber is formed within the isolation cylinder, wherein the high-pressure chamber, the normal-pressure chamber, and the isolation chamber are not interconnected, wherein the high-pressure chamber is located between the middle housing and the diaphragm, and the normal-pressure chamber is located between the diaphragm, the front end cover, the isolation cylinder, and the sealing assembly;

[0008] The isolation cylinder is connected to the diaphragm via a push plate, and the isolation cylinder is coaxially connected to the push plate;

[0009] The front end cover is provided with a braking through hole. Along the axial direction of the isolation cylinder, the contour of the isolation cavity intersects with the contour of the braking through hole. The isolation cavity is connected to the atmosphere. Along the radial direction of the isolation cylinder, the gap between the isolation cylinder and the braking through hole is sealed by the sealing assembly. The sealing assembly is connected to the front end cover, and the isolation cylinder and the sealing assembly form a sliding pair.

[0010] The isolation cylinder is provided with a push rod, and the two ends of the push rod are respectively a receiving end and an output end. The receiving end is confined in the isolation cavity, and the output end is located outside the isolation cavity, and the output end passes through the brake through hole and is located outside the front end cover.

[0011] Furthermore, the isolation cavity is limited to a blind hole structure;

[0012] The two ends of the isolation cylinder are respectively a head end and a tail end, the tail end is connected to the push plate, and the isolation cavity is limited to be recessed in the isolation cylinder along the direction from the head end to the tail end.

[0013] Furthermore, the sealing assembly includes a sealing seat, a first sealing ring, a second sealing ring, an oil seal, and a guide ring;

[0014] The sealing seat is connected to the front end cover, the outline of the sealing seat covers the brake through hole, and the sealing seat is provided with a brake channel, which is coaxial with and intersects with the brake through hole;

[0015] The isolation cylinder is inserted into the brake channel, and the gap between the isolation cylinder and the sealing seat is sealed by the first sealing ring;

[0016] The two ends of the brake channel are respectively a head end and a tail end, the head end is located at the brake through hole, the tail end is located in the normal pressure cavity, and the oil seal is provided at the tail end;

[0017] The oil seal comprises a mounting portion confined between the sealing seat and the isolation cylinder, and a lip portion confined outside the sealing seat and the isolation cylinder, wherein the mounting portion and the lip portion are integrally formed, and along the circumferential direction of the isolation cylinder, the lip portion is in an annular shape and contacts the isolation cylinder;

[0018] The second sealing ring is located outside the front end cover and is coaxially connected to the sealing seat along the direction from the head end to the tail end;

[0019] The inner surface of the sealing seat is recessed with a fourth positioning groove, and the guide ring is arranged in the fourth positioning groove, wherein the guide ring has an outer circumferential surface facing the sealing seat and an inner circumferential surface facing the isolation cylinder, the outer circumferential surface contacts the sealing seat, and the inner circumferential surface contacts the isolation cylinder.

[0020] Furthermore, the receiving end is configured to be in the shape of a ball head;

[0021] A first ball socket and a card slot are machined in the isolation cylinder. The first ball socket and the inner surface of the isolation cylinder form a first positioning opening. The opening direction of the first positioning opening is limited to the direction of the axis of the isolation cylinder. The card slot is recessed in the inner surface of the isolation cylinder. The outline of the card slot is perpendicular to the axis of the isolation cylinder. The card slot is located outside the first ball socket, and an installation space is formed between the outline of the card slot and the outline of the first ball socket.

[0022] A plug snap ring and a retaining ring are provided in the isolation cylinder. The plug snap ring is provided in the installation space. The retaining ring is clamped into the clamping groove. The plug snap ring is confined between the first ball socket and the plug snap ring. The inner ring diameter of the plug snap ring is smaller than the diameter of the first positioning opening.

[0023] The position of the receiving end is restricted by the head retaining ring to the position of the first ball socket.

[0024] Furthermore, the isolation cavity and the end face located at the head end form a working opening, the diameter of the working opening is larger than the maximum diameter of the push rod, wherein the working opening is at least used to limit the swing angle of the push rod relative to the isolation cylinder.

[0025] Furthermore, a return spring is provided in the normal pressure chamber, and the return spring is sleeved on the isolation cylinder and the sealing assembly, one end of the return spring contacts the front end cover, and the other end of the return spring contacts the push plate.

[0026] Furthermore, it also includes a parking brake chamber constructed by the middle housing and the energy storage cylinder, the parking brake chamber forms a first chamber and a second chamber through a piston, wherein the first chamber is located between the energy storage cylinder, the piston and the middle housing, and the second chamber is located between the energy storage cylinder and the piston;

[0027] An energy storage spring is provided in the second chamber, one end of the energy storage spring contacts the energy storage cylinder, and the other end of the energy storage spring contacts the piston;

[0028] A piston shaft is provided in the first chamber, and the two ends of the piston shaft are respectively an active end and a driven end. The middle shell is provided with a connecting through hole for being penetrated by the piston shaft, and the driven end is inserted into the connecting through hole. The piston is provided with a mounting groove, and the active end is inserted into the mounting groove, and the active end contacts the diaphragm.

[0029] According to one aspect of the present invention, there is provided a commercial vehicle comprising a brake and a brake chamber as described above;

[0030] The brake is provided with a thrust arm, the thrust arm is provided with a second ball socket, and the output end of the push rod is inserted into the second ball socket.

[0031] The above technical solution has the following advantages or beneficial effects:

[0032] The brake chamber provided by the present invention replaces the support sleeve in the prior art by providing an isolation cylinder and a sealing assembly. The isolation structure composed of the front end cover, the isolation cylinder and the sealing assembly has the air-tightness function of the support sleeve in the prior art. Since the isolation cylinder is a rigid component, the pressure of the water pushed by the push plate cannot cause the isolation cylinder to rupture or deform; since the isolation cylinder cannot rupture or deform, and under the condition that the sealing assembly seals the gap between the isolation cylinder and the brake through hole of the front end cover, the water in the normal pressure chamber cannot reach the active path of the push rod, so that the water is confined in the normal pressure chamber, and the water in the normal pressure chamber cannot flow into the brake through the active path of the push rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A cross-sectional view of a brake chamber provided in Example 1 of the present invention;

[0034] Figure 2 A schematic structural diagram of a brake air chamber provided in Example 1 of the present invention;

[0035] Figure 3 A cross-sectional view of an isolation cylinder provided in Example 1 of the present invention;

[0036] Figure 4 A cross-sectional view of a sealing assembly provided in Example 1 of the present invention;

[0037] Figure 5 A schematic structural diagram of a push rod provided in Example 1 of the present invention;

[0038] Figure 6 A cross-sectional view of a plug retaining ring and a retaining ring provided in Example 1 of the present invention;

[0039] Figure 7 A cross-sectional view of the front end cover provided in Example 1 of the present invention;

[0040] Figure 8A cross-sectional view of a portion of a brake air chamber provided in embodiment 1 of the present invention.

[0041] Reference numerals: 1, middle housing; 2, front end cover; 3, diaphragm; 4, isolation cylinder; 5, sealing assembly; 6, push plate; 7, push rod; 8, return spring; 9, energy storage cylinder; 10, piston; 11, piston shaft; 12, energy storage spring; 13, active end; 14, driven end;

[0042] 20. Brake through hole; 21. Air outlet; 22. Gap; 40. Isolation cavity; 41. Head end; 42. End end; 43. First ball socket; 44. Retaining groove; 45. First positioning opening; 46. Installation space; 47. Head retaining ring; 48. Retaining ring; 49. Working opening; 50. Brake channel; 51. Sealing seat; 52. First sealing ring; 53. Second sealing ring; 54. Oil seal; 55. Guide ring; 71. Receiving end; 72. Output end

[0043] 100, service brake chamber; 110, high-pressure chamber; 120, normal-pressure chamber; 130, P11 port; 140, P12 port; 200, parking brake chamber; 210, first chamber; 220, second chamber. DETAILED DESCRIPTION

[0044] Example 1:

[0045] In this embodiment, a brake air chamber is provided to solve the technical problem of how to prevent water from entering the brake through the movable path of the push rod.

[0046] For details, see Figure 1 The brake air chamber of this embodiment includes a service brake chamber 100 constructed by a middle housing 1 and a front end cover 2. The service brake chamber 100 forms a high-pressure chamber 110 and a normal-pressure chamber 120 through a diaphragm 3, a rigid isolation cylinder 4, and a sealing assembly 5. An isolation chamber 40 is formed within the isolation cylinder 4. The high-pressure chamber 110, the normal-pressure chamber 120, and the isolation chamber 40 are not connected to each other. The high-pressure chamber 110 is located between the middle housing 1 and the diaphragm 3, and the normal-pressure chamber 120 is located between the diaphragm 3, the front end cover 2, the isolation cylinder 4, and the sealing assembly 5.

[0047] The isolation cylinder 4 is connected to the diaphragm 3 through the push plate 6, and the isolation cylinder 4 is coaxially connected to the push plate 6;

[0048] The front end cover 2 is provided with a brake through hole 20 (see Figure 7 ), along the axial direction of the isolation cylinder 4, the outline of the isolation cavity 40 intersects with the outline of the brake through hole 20, and the isolation cavity 40 is connected to the atmosphere. Along the radial direction of the isolation cylinder 4, the gap between the isolation cylinder 4 and the brake through hole 20 is sealed by the sealing assembly 5, wherein the sealing assembly 5 is connected to the front end cover 2, and the isolation cylinder 4 and the sealing assembly 5 form a sliding pair;

[0049] The isolation cylinder 4 is provided with a push rod 7, the two ends of the push rod 7 are a receiving end 71 and an output end 72 (see Figure 5 ), the receiving end 71 is confined in the isolation cavity 40, the output end 72 is located outside the isolation cavity 40, and the output end 72 passes through the brake through hole 20 and is located outside the front end cover 2.

[0050] In this embodiment, the high pressure chamber 110 is used to be injected with compressed air, so that the pressure of the compressed air can push the push plate 6 to move along the axis of the isolation cylinder 4 or along the axis of the brake through hole 20; see Figure 2 The middle housing 1 is provided with a P11 port 130 for compressed air circulation. The P11 port 130 communicates with the high-pressure chamber 110. Compressed air is injected into the high-pressure chamber 110 from the P11 port 130. Furthermore, the compressed air in the high-pressure chamber 110 is discharged from the P11 port 130 to the outside of the high-pressure chamber 110 or to the outside of the service brake chamber 100.

[0051] In this embodiment, the normal pressure chamber 120 and the isolation chamber 40 cannot be injected with compressed air;

[0052] Among them, see Figure 1 or Figure 2 The normal pressure chamber 120 is confined between the front end cover 2 and the diaphragm 3. The front end cover 2 is provided with an air port 21 communicating with the atmosphere (see Figure 2 ), so that when compressed air is injected into the aforementioned high-pressure chamber 110, as the push plate 6 moves, some of the air in the normal-pressure chamber 120 is discharged into the atmosphere through the air outlet 21, thereby achieving the effect of reducing the air pressure in the normal-pressure chamber 120; when the pressure of the compressed air in the aforementioned high-pressure chamber 110 decreases and the elastic force of the return spring mentioned later is greater than the pressure of the compressed air in the high-pressure chamber 110, as the push plate 6 is pushed by the return spring, external air is injected into the normal-pressure chamber 120 through the air outlet 21, thereby achieving the purpose of increasing the air pressure in the normal-pressure chamber 120;

[0053] Also, see Figure 1 The isolation cylinder 4, the sealing assembly 5 and the front end cover 2 form an isolation structure, so that the normal pressure chamber 120 and the isolation chamber 40 are not connected to each other; at the same time, the structure of the isolation cylinder 4 itself is a rigid structure, resulting in the pressure of the water pushed by the push rod 7 cannot destroy the isolation cylinder 4, that is, the isolation cylinder 4 cannot break or deform; this isolation structure is for the brake air chamber as a whole. On the one hand, if there is water inside the normal pressure chamber 120, then the water cannot enter the isolation chamber 40. On the other hand, the push rod 7 needs to receive the driving force from the push plate 6, so the push rod 7 can only be accommodated in the isolation chamber 40.

[0054] In this embodiment, the isolation cylinder 4 is constructed as a cylindrical rigid structure as a whole, and the isolation cylinder 4 is coaxially connected to the push plate 6, so that the push plate 6 can drive the isolation cylinder 4 to move relative to the front end cover 2; specifically, the push plate 6 and the isolation cylinder 4 are connected by welding, which is safe and reliable, has fewer processing steps and low economic cost.

[0055] It should be understood that in other embodiments, the isolation cylinder 4 and the push plate 6 can be made into one piece, or the isolation cylinder 4 and the push plate 6 can adopt a detachable connection method, including threaded connection, snap connection, positioning line connection, etc. However, these integrally made or detachable connection methods require a large number of processing steps, which leads to increased costs.

[0056] In this embodiment, see Figure 8 A gap 22 is formed between the isolation cylinder 4 and the brake through hole 20 of the front end cover 2. The sealing assembly 5 is used to seal the gap 22 to prevent the normal pressure chamber 120 from communicating with the atmosphere through the gap 22. From a practical application perspective, if there is water in the normal pressure chamber 120, the water cannot flow into the brake through the gap 22 between the isolation cylinder 4 and the brake through hole 20.

[0057] In this embodiment, the structure of the diaphragm 3 is the structure of the diaphragm in the prior art, and the connection method between the diaphragm 3 and the push plate 6 is the connection method between the diaphragm and the push plate in the prior art; for example: the structure of the piston plate in the prior art (double-piston brake air chamber and brake air chamber kit, application number: 202422376356.7) is equivalent to the connection structure of the diaphragm 3 and the push plate 6 in this embodiment.

[0058] In this embodiment, see Figure 7 or Figure 8 The front end cover 2 is provided with a brake through hole 20, which is used to be penetrated by the isolation cylinder 4 and the push rod 7, so that the isolation cylinder 4 and the push rod 7 can respectively move from the inside to the outside of the front end cover 2 and from the outside to the inside through the brake through hole 20;

[0059] The front cylinder head in the above-mentioned prior art is also provided with a hole for being penetrated by the push rod, so that the push rod can move from the inside to the outside of the front cylinder head and from the outside to the inside through the hole.

[0060] In this embodiment, see Figure 1 or Figure 7 The sealing assembly 5 is fixedly arranged on the front end cover 2 at the position of the brake through hole 20. The outline of the sealing assembly 5 covers the outline of the brake through hole 20. The brake channel 50 (see Figure 4) coincides with the brake through hole 20, but the diameter of the brake channel 50 of the sealing assembly 5 for being inserted into the isolation cylinder 4 is smaller than the diameter of the brake through hole 20;

[0061] The position of the isolation cylinder 4 relative to the brake through hole 20 can be changed, and the position of the sealing assembly 5 relative to the brake through hole 20 cannot be changed. Therefore, when the isolation cylinder 4 is inserted into the brake channel 50 of the sealing assembly 5, the isolation cylinder 4 and the sealing assembly 5 must form a sliding pair so that the position of the isolation cylinder 4 relative to the sealing assembly 5 can be changed.

[0062] After the brake chamber of this embodiment is actually connected to the brake, the output end 72 of the push rod 7 (see Figure 1 or Figure 5 ) is arranged in the ball socket of the thrust arm of the brake; in the process of the push rod 7 applying braking force to the brake, since the axis line of the push rod 7 and the axis line of the isolation cylinder 4 are collinear, and the push rod 7 and the isolation cylinder 4 are respectively driven in the same direction by the push plate 6, the moving path of the push rod 7 and the moving path of the isolation cylinder 4 are coincident, which results in that the water in the normal pressure chamber 120 is blocked by the "isolation structure composed of the isolation cylinder 4, the sealing assembly 5 and the front end cover 2", so that the water cannot flow along the moving path of the isolation cylinder 4 or the push rod 7, and thus the water cannot enter the brake along the moving path of the isolation cylinder 4 or the push rod 7.

[0063] In the prior art (dual-piston brake chamber and brake chamber kit, application number: 202422376356.7), the support sleeve has the function of ensuring airtightness, preventing external impurities from entering the chamber between the front cylinder head and the piston disc through the movable path of the push rod, or preventing impurities in the chamber between the front cylinder head and the piston disc from entering the brake through the movable path of the push rod; if there is water in the chamber between the front cylinder head and the piston disc, then as the push plate is driven by the compressed air in the driving chamber, the push plate squeezes the water, and the water cannot be discharged from the "chamber between the front cylinder head and the piston disc" in time, so the water pressure is applied to the support sleeve, causing the support sleeve to be damaged;

[0064] In this embodiment, an isolation tube 4 and a sealing assembly 5 are provided to replace the support sleeve in the above-mentioned prior art. The isolation structure composed of the front end cover 2, the isolation tube 4 and the sealing assembly 5 has the airtightness function of the support sleeve in the above-mentioned prior art. Since the isolation tube 4 is a rigid component, the pressure of the water pushed by the push plate 6 cannot cause the isolation tube 4 to rupture or deform.

[0065] In the above-mentioned prior art, if water exists in the chamber between the front cylinder head and the piston disc, and the support sleeve is damaged by the pressure of the water and ruptures, the water flows through the crack of the ruptured support sleeve into the movable path of the push rod, and then the water flows along the movable path of the push rod into the brake;

[0066] In this embodiment, since the isolation cylinder 4 cannot break or deform, and under the condition that the sealing assembly 5 seals the gap between the isolation cylinder 4 and the brake through hole 20 of the front end cover 2, the water in the normal pressure chamber 120 cannot reach the moving path of the push rod 7, so that the water is restricted in the normal pressure chamber 120, and the water in the normal pressure chamber 120 cannot flow into the brake through the moving path of the push rod 7.

[0067] Therefore, the brake air chamber of this embodiment solves the technical problem of how to prevent water from entering the brake through the movable path of the push rod.

[0068] It should be understood that in the foregoing and subsequent contents, the active path of the push rod 7 refers to the active space of the push rod 7; for the above-mentioned prior art, the active space of the push rod includes the space formed by the support sleeve located in the driving cavity, and the space occupied by the push rod extending out of the front cylinder cover and inserted into the interior of the brake; similarly, for this embodiment, the active space of the push rod 7 includes the space of the isolation cavity 40, and the space occupied by the push rod 7 extended to the outside of the front end cover 2 and inserted into the interior of the brake.

[0069] It should be understood that in the foregoing and subsequent contents, the high-pressure chamber 110 and the normal-pressure chamber 120 merely refer to the names of the chambers and do not have the function of limiting the specific pressure values; in this embodiment, the chamber of the service brake chamber 100 into which compressed air is injected is defined as the high-pressure chamber 110, and the chamber of the service brake chamber 100 into which compressed air is not injected is defined as the normal-pressure chamber 120.

[0070] Furthermore, based on the above solution, how to prevent the water in the normal pressure chamber 120 from entering the isolation chamber 40 through the gap between the push plate 6 and the isolation cylinder 4 is preferably achieved by adopting the following technical solution.

[0071] In this embodiment, see Figure 3 , the isolation cavity 40 is limited to a blind hole structure;

[0072] The two ends of the isolation cylinder 4 are respectively a head end 41 and a tail end 42, and the tail end 42 is connected to the push plate 6 (see Figure 1 ), the isolation cavity 40 is limited to being recessed in the isolation cylinder 4 along the direction from the head end 41 to the tail end 42.

[0073] In this embodiment, the isolation chamber 40 forms an opening at the head end 41 of the isolation cylinder 4, while the isolation chamber 40 does not form an opening at the end 42 of the isolation cylinder 4, so that the isolation chamber 40 is connected to the atmosphere only through the opening at the head end 41 of the isolation cylinder 4, and the isolation chamber 40 is blocked by the isolation cylinder 4 itself at the end 42 of the isolation cylinder 4, resulting in the isolation chamber 40 located at the end 42 being unable to communicate with the normal pressure chamber 120; this prevents the water in the normal pressure chamber 120 from entering the isolation chamber 40 from the gap between the push plate 6 and the isolation cylinder 4.

[0074] Furthermore, based on the above-mentioned solution, this embodiment provides a specific structure of a sealing assembly 5 to facilitate understanding of this embodiment by those skilled in the art.

[0075] Specifically, in this embodiment, see Figure 1 or Figure 4 The sealing assembly 5 includes a sealing seat 51, a first sealing ring 52, a second sealing ring 53, an oil seal 54, and a guide ring 55;

[0076] The sealing seat 51 is connected to the front end cover 2 (see Figure 1 ), the outline of the sealing seat 51 covers the brake through hole 20, and the sealing seat 51 is provided with a brake channel 50, which is coaxial with and intersects the brake through hole 20;

[0077] The isolation cylinder 4 is inserted into the brake channel 50, and the gap between the isolation cylinder 4 and the sealing seat 51 is sealed by the first sealing ring 52;

[0078] The brake channel 50 has a head end and a tail end, respectively. The head end is located at the brake through hole 20 and the tail end is located in the normal pressure cavity 120. The oil seal 54 is provided at the tail end.

[0079] The oil seal 54 includes a mounting portion constrained between the sealing seat 51 and the isolation cylinder 4, and a lip portion constrained outside the sealing seat 51 and the isolation cylinder 4. The mounting portion and the lip portion are integrally formed, and the lip portion is annularly contacts the isolation cylinder 4 along the circumference of the isolation cylinder 4.

[0080] The second sealing ring 53 is located outside the front end cover 2 and is coaxially connected to the sealing seat 51 along the direction from the head end 41 to the tail end 42;

[0081] The inner surface of the sealing seat 51 is recessed with a fourth positioning groove, and the guide ring 55 is arranged in the fourth positioning groove, wherein the guide ring 55 has an outer circumferential surface facing the sealing seat 51 and an inner circumferential surface facing the isolation tube 4, the outer circumferential surface contacts the sealing seat 51, and the inner circumferential surface contacts the isolation tube 4.

[0082] Among them, the sealing seat 51 is a rigid structure, and a part of the sealing seat 51 is constructed as a cylinder with openings at both ends. The outline of the sealing seat 51 covers the braking through hole 20, and the sealing seat 51 is fixedly connected to the front end cover 2; in this embodiment, the sealing seat 51 and the front end cover 2 are welded together, and its welding structure is simple and reliable, and the economic cost is low.

[0083] It should be understood that in other embodiments, the sealing seat 51 can be made integrally with the front end cover 2, or the sealing seat 51 and the front end cover 2 can be connected by clamping or snapping. However, the connection method or manufacturing method of the sealing seat 51 and the front end cover 2 in other embodiments will add more processing steps and lead to increased economic costs.

[0084] In this embodiment, the sealing seat 51 is limited to a rigid structure for the same purpose as the aforementioned isolation tube 4 is limited to a rigid structure, both of which are to prevent the sealing seat 51 from being damaged by water pressure and causing rupture or deformation.

[0085] The sealing seat 51 itself also has the function of providing support or positioning for other structures, specifically:

[0086] The sealing seat 51 has the function of supporting or positioning the first sealing ring 52. Figure 1 or Figure 4 The function of the first sealing ring 52 itself is to seal the gap between the isolation cylinder 4 and the sealing seat 51; a first positioning groove for installing the first sealing ring 52 is provided on the sealing seat 51, and the first positioning groove is located in the brake channel 50 where the sealing seat 51 is inserted by the isolation cylinder 4, and the first positioning groove is recessed in the inner surface of the sealing seat 51; in the process of inserting the first sealing ring 52 from the outside of the sealing seat 51 into the cavity of the sealing seat 51, the first sealing ring 52 is squeezed and slightly deformed, so that the diameter of the first sealing ring 52 is reduced and inserted into the cavity of the sealing seat 51; when the first sealing ring 52 reaches the position of the first positioning groove, the elastic force of the first sealing ring 52 itself causes the first sealing ring 52 to change from the state of reduced diameter to the normal state, so that the first sealing ring 52 is stuck in the first positioning groove; in the process of the isolation cylinder 4 moving relative to the sealing seat 51, the first sealing ring 52 is restricted by the first positioning groove, so that the first sealing ring 52 cannot move relative to the sealing seat 51, and correspondingly, the first sealing ring 52 and the isolation cylinder 4 generate relative movement;

[0087] In this embodiment, the first sealing ring 52 is specifically an O-ring; the structure of the O-ring and the structure of the first positioning groove matching the O-ring are simple, which is conducive to reducing manufacturing costs; it should be understood that those skilled in the art can choose the first sealing ring 52 as other types of sealing rings, as long as the gap between the sealing seat 51 and the isolation tube 4 can be sealed.

[0088] The sealing seat 51 has the function of supporting or positioning the second sealing ring 53. Figure 1 or Figure 4 The function of the second sealing ring 53 itself is to seal the gap between the sealing seat 51 and the brake housing; a positioning surface is provided on the end of the sealing seat 51 exposed to the outside of the front end cover 2, so that the second sealing ring 53 can be set on the positioning surface; it should be understood that the second sealing ring 53 and the sealing seat 51 can be connected by bonding; when the brake air chamber of this embodiment is connected to the brake, the gap between the sealing seat 51 and the brake is sealed by the second sealing ring 53, preventing external water and impurities (outside the brake and outside the brake air chamber) from entering the isolation cavity 40 and the brake.

[0089] It should be understood that, in this embodiment, there is no specific limitation on the specific material of the second sealing ring 53 , as long as the second sealing ring 53 can seal the gap between the sealing seat 51 and the brake housing.

[0090] The sealing seat 51 has the function of supporting or positioning the oil seal 54. Figure 1 or Figure 4 The function of the oil seal 54 itself is to scrape off impurities attached to the isolation tube 4 to prevent impurities from entering the gap between the sealing seat 51 and the isolation tube 4 as the isolation tube 4 moves; the end of the sealing seat 51 that is restricted in the front end cover 2 is processed with a third positioning groove, the third positioning groove is recessed in the inner surface of the sealing seat 51, and forms a mouth with the end of the oil seal 54 that is restricted in the front end cover 2, so that the mounting portion of the oil seal 54 can be set in the third positioning groove along the axial direction of the sealing seat 51; the lip edge portion of the oil seal 54 is located outside the third positioning groove, wherein the lip edge portion is in an annular shape and contacts the isolation tube 4. When the isolation tube 4 is made along the front end cover 2 When the isolation tube 4 moves from the inside to the outside, the friction between the isolation tube 4 and the lip portion forces the lip portion to change from its original state to a state of elastic deformation. After the elastic deformation, the lip portion is still located outside the third positioning groove and will not restrict the movement of the isolation tube 4; the elastically deformed lip portion of the production line scrapes off impurities attached to the isolation tube 4 through friction, preventing impurities from entering the gap between the sealing seat 51 and the isolation tube 4; when the isolation tube 4 moves from the outside to the inside of the front end cover 2, as the friction between the isolation and the lip portion gradually decreases, the elastic deformation of the lip portion gradually decreases until the lip portion returns to its original state.

[0091] The sealing seat 51 has the function of supporting or positioning the guide ring 55. Figure 1 or Figure 4The function of the guide ring 55 itself is to limit the movement direction of the isolation cylinder 4 relative to the front end cover 2 to a straight line direction, and to reduce the friction between the isolation cylinder 4 and the sealing seat 51; the specific structure of the guide ring 55 can adopt the structure of the guide ring 55 in the prior art, which will not be repeated here; the sealing seat 51 is provided with a fourth positioning groove for installing the guide ring 55, and the fourth positioning groove is recessed in the inner surface of the sealing seat 51; the guide ring 55 is arranged in the fourth positioning groove, the outer circumferential surface of the guide ring 55 contacts the sealing seat 51, and the inner circumferential surface of the guide ring 55 contacts the isolation cylinder 4, and the thickness of the guide ring 55 is greater than the gap between the sealing seat 51 and the isolation cylinder 4, so that the contact area between the isolation cylinder 4 and the guide ring 55 is smaller than the contact area between the isolation cylinder 4 and the sealing seat 51, thereby reducing the friction between the isolation cylinder 4 and the guide ring 55.

[0092] Furthermore, based on the above solution, how to reduce the work done by the push rod 7 on the brake becomes a technical problem to be solved;

[0093] The brake air chamber is used to control the brake to generate or release braking force; from the perspective of the brake, the brake has a thrust arm, and the movement path of the thrust arm is a swinging path; if the movement path of the push rod 7 of the brake air chamber is limited to a straight line motion path, then the push rod 7 contacts the ball socket of the thrust arm, and the two swing relative to each other. Under the condition of constant friction, if the length of this relative swinging path is relatively long, the work done by the push rod 7 on the ball socket of the thrust arm is relatively large, which can easily cause the service life of the push rod 7 and / or the ball socket of the thrust arm to be reduced.

[0094] The brake chamber in this embodiment, see Figure 1 or Figure 3 or Figure 5 or Figure 6 , the receiving end 71 of the push rod 7 is configured to be in the shape of a ball head;

[0095] A first ball socket 43 and a clamping groove 44 are formed in the isolation cylinder 4 (see Figure 3 ), the first ball socket 43 and the inner surface of the isolation tube 4 form a first positioning opening 45, the opening direction of the first positioning opening 45 is limited to the direction of the axis of the isolation tube 4, the clamping groove 44 is recessed in the inner surface of the isolation tube 4, the outline of the clamping groove 44 is perpendicular to the axis of the isolation tube 4, the clamping groove 44 is located outside the first ball socket 43, and the outline of the clamping groove 44 and the outline of the ball socket form an installation space 46;

[0096] A head snap ring 47 and a retaining ring 48 are provided in the spacer cylinder 4 (see Figure 6 ), the plug snap ring 47 is arranged in the installation space 46, the retaining ring 48 is clamped into the clamping groove 44, the plug snap ring 47 is confined between the first ball socket 43 and the plug snap ring 47, and the inner ring diameter of the plug snap ring 47 is smaller than the diameter of the first positioning opening 45;

[0097] The position of the receiving end 71 is restricted to the position of the first ball socket 43 by the plug snap ring 47 .

[0098] See also Figure 1 After the brake chamber and the brake are assembled in this embodiment, the receiving end 71 of the push rod 7 and the first ball socket 43 of the isolation cylinder 4 form a first swing pair, and the output end 72 of the push rod 7 and the ball socket of the thrust arm of the brake form a second swing pair;

[0099] Assuming that, in the comparative example, the motion path of the push rod is restricted to a straight path, then the push rod and the ball socket of the brake's thrust arm form a third swing pair; in this case, if the push rod of the comparative example performs a straight reciprocating motion, then the swing angle of the third swing pair is the same as the swing angle of the brake's thrust arm itself;

[0100] The structure of the brake chamber and the brake after assembly in this embodiment is compared with the structure in the comparative example. In this embodiment, the push rod 7 is a part of each of the two swing pairs. The push rod 7 can swing relative to the isolation cylinder 4 and the ball socket of the brake's thrust arm.

[0101] In terms of the swing angle of the push rod 7, in this embodiment, the isolation cylinder 4 is pushed by the push plate 6, and during the movement of the isolation cylinder 4 from the inside to the outside of the front end cover 2, the push rod 7 in this embodiment swings relative to the isolation cylinder 4 and the ball socket of the thrust arm. This makes the sum of the swing angle of the push rod 7 in this embodiment relative to the isolation cylinder 4 and the swing angle of the push rod 7 relative to the ball socket of the thrust arm equal to the swing angle of the push rod relative to the thrust arm in the above-mentioned comparative example; conversely, the swing angle of the push rod 7 in this embodiment relative to the ball socket of the thrust arm is smaller than the swing angle of the push rod relative to the thrust arm in the above-mentioned comparative example.

[0102] Therefore, the push rod 7 in this embodiment has a receiving end 71 used to form a first swing pair with the isolation tube 4, and an output end 72 used to form a second swing pair with the ball socket of the thrust arm of the brake. The swing angle generated by the push rod 7 through the second swing pair is relatively small, so that the swing distance generated by the push rod 7 and the ball socket of the thrust arm of the brake is relatively small, thereby reducing the work done by the push rod 7 on the ball socket of the thrust arm, and improving the service life of the push rod 7 and / or the ball socket of the thrust arm.

[0103] In this embodiment, the first ball socket 43 and the inner surface of the isolation cylinder 4 form a first positioning opening 45 (see Figure 3), the opening direction of the first positioning opening 45 is the same as the opening direction of the opening (working opening 49) of the isolation chamber 40 formed at the head end 41 of the isolation cylinder 4, and the push rod 7 is arranged in the isolation chamber 40 from the outside to the inside, and is arranged in the first ball socket 43;

[0104] In this embodiment, Figure 1 The first ball socket 43 is provided with a plurality of end portions of the push rod 7 and a plurality of end portions of the push rod 7. The first ball socket 43 is provided with a plurality of end portions of the push rod 7 and a plurality of end portions of the push rod 7 are provided with a plurality of end portions of the push rod 7 and a plurality of end portions of the push rod 7.

[0105] Therefore, the head retaining ring 47, the retaining ring 48 and the installation space 46 between the retaining groove 44 of the isolation cylinder 4 and the first ball socket 43 jointly restrict the receiving end 71 of the push rod 7 from moving relative to the isolation cylinder 4 along the axis of the isolation cylinder 4, thereby preventing the push rod 7 from separating from the isolation cylinder 4 along the axis of the isolation cylinder 4.

[0106] In addition, since the position of the receiving end 71 of the push rod 7 is limited to the position of the first ball socket 43, the receiving end 71 of the push rod 7 cannot move along the radial direction of the isolation cylinder 4, so the push rod 7 cannot separate from the isolation cylinder 4 along the radial direction of the isolation cylinder 4.

[0107] For further information, see Figure 1 or Figure 3 In the brake air chamber of this embodiment, the isolation cavity 40 and the end face at the head end 41 form a working port 49, the diameter of the working port 49 is larger than the maximum diameter of the push rod 7, wherein the working port 49 is at least used to limit the swing angle of the push rod 7 relative to the isolation cylinder 4.

[0108] See also Figure 1 or Figure 5 In this embodiment, the diameter of the receiving end 71 of the push rod 7 is larger than the diameters of the other push rods 7, and the diameter of the working port 49 is larger than the diameter of the receiving end 71, so that the receiving end 71 can be inserted into the isolation cavity 40 and disposed in the first ball socket 43;

[0109] See also Figure 1 After the receiving end 71 of the push rod 7 is set to the first ball socket 43, the aforementioned head snap ring 47 is sleeved on the push rod 7 and inserted into the gap between the push rod 7 and the isolation cylinder 4 through the working port 49; during this, the head snap ring 47 itself does not deform, and the head snap ring 47 is pushed by the cylindrical tool to move in the gap between the push rod 7 and the isolation cylinder 4 until the head snap ring 47 contacts the isolation cylinder 4 located at the position of the first ball socket 43 and stops; the cylindrical tool can be sleeved on the push rod 7 and can produce relative movement relative to the push rod and the isolation cylinder 4.

[0110] See also Figure 1 After the head retaining ring 47 is set in the isolation chamber 40, the aforementioned retaining ring 48 is set on the push rod 7 and inserted into the gap between the push rod 7 and the isolation cylinder 4 through the working port 49; here, first, the diameter of the retaining ring 48 is reduced by using a circlip pliers, but the retaining ring 48 can still be set on the push rod 7, so that the retaining ring 48 driven by the circlip pliers accumulates energy; then, when the retaining ring 48 is set in the gap between the push rod 7 and the isolation cylinder 4, the circlip pliers are separated from the retaining ring 48, and then the aforementioned cylindrical tool is used to push the retaining ring 48 until the retaining ring 48 reaches the position of the card slot 44, and the retaining ring 48 releases the accumulated energy and automatically snaps into the card slot 44.

[0111] In this embodiment, see Figure 1 or Figure 2 One end of the push rod 7 is exposed outside the isolation chamber 40, and the receiving end 71 of the push rod 7 is arranged in the first ball socket 43. Therefore, when the push rod 7 swings relative to the isolation cylinder 4, the swinging angle of the push rod 7 is limited by the working port 49 of the isolation cylinder 4. When the push rod 7 contacts the working port 49, the swinging movement of the push rod 7 relative to the isolation cylinder 4 is terminated.

[0112] It should be understood that the present embodiment does not impose any specific restriction on the swing angle of the push rod 7 relative to the isolation cylinder 4; those skilled in the art should be aware that the swing angle of the push rod 7 produced by cooperating with the thrust arm will be different depending on the swing angle of the thrust arm of the brake; to put it another way, the swing angle of the push rod 7 of the present embodiment relative to the isolation cylinder 4 can be smaller than the swing angle of the thrust arm, or the swing angle of the push rod 7 relative to the isolation cylinder 4 can be such that it does not interfere with the swing angle of the thrust arm.

[0113] For further information, see Figure 1 In the brake air chamber of this embodiment, a return spring 8 is provided in the normal pressure chamber 120. The return spring 8 is sleeved on the isolation cylinder 4 and the sealing assembly 5. One end of the return spring 8 contacts the front end cover 2, and the other end of the return spring 8 contacts the push plate 6.

[0114] When the vehicle is moving and service braking is being applied, compressed air is injected into the high-pressure chamber 110, and when the pressure of the compressed air is greater than the elastic force of the return spring 8, the compressed air pushes the diaphragm 3 and the push plate 6, causing the push plate 6 to move in a direction from the push plate 6 to the sealing seat 51, and the distance between the push plate 6 and the sealing seat 51 is reduced, wherein the return spring 8 is compressed and accumulates energy, and the isolation cylinder 4 and the push rod 7 respectively move from the inside to the outside of the front end cover 2, causing the push rod 7 to push the thrust arm of the brake to generate service braking action;

[0115] When the compressed air in the high-pressure chamber 110 is discharged and the pressure of the compressed air is lower than the elastic force of the return spring 8, the return spring 8 releases energy, so that the return spring 8 drives the push plate 6 and the diaphragm 3 to move along the direction from the sealing seat 51 to the push plate 6, and the distance between the push plate 6 and the sealing seat 51 increases, wherein the isolation cylinder 4 and the push rod 7 respectively move from the outside to the inside of the front end cover 2, so that the thrust arm of the brake is reset and the service braking action is eliminated.

[0116] For further information, see Figure 1 The brake air chamber of this embodiment further includes a parking brake chamber 200 constructed by the middle housing 1 and the energy storage cylinder 9. The parking brake chamber 200 forms a first chamber 210 and a second chamber 220 through the piston 10, wherein the first chamber 210 is located between the energy storage cylinder 9, the piston 10 and the middle housing 1, and the second chamber 220 is located between the energy storage cylinder 9 and the piston 10;

[0117] An energy storage spring 12 is disposed in the second chamber 220 , one end of the energy storage spring 12 contacts the energy storage cylinder 9 , and the other end of the energy storage spring 12 contacts the piston 10 ;

[0118] A piston shaft 11 is provided in the first chamber 210 , and the two ends of the piston shaft 11 are respectively an active end 13 and a driven end 14 . The middle housing 1 is provided with a connecting through hole for being penetrated by the piston shaft 11 , and the driven end 14 is inserted into the connecting through hole. The piston 10 is provided with a mounting groove, and the active end 13 is inserted into the mounting groove, and the active end 13 contacts the diaphragm 3 .

[0119] When the vehicle stops and the parking brake is generated, the aforementioned high-pressure chamber 110 is not injected with compressed air, and the compressed air in the first chamber 210 of the parking brake is discharged to the outside of the brake air chamber of this embodiment; at this time, the energy storage spring 12 releases energy and the length of the energy storage spring 12 increases; the energy storage spring 12 drives the piston 10, and the piston 10 generates a movement along the direction of the energy storage cylinder 9 to the middle shell 1, so that the piston 10 pushes the piston shaft 11 to move, and the piston shaft 11 pushes the diaphragm 3 and the push plate 6 located in the service brake chamber 100, so that the push plate 6 drives the isolation cylinder 4 and the push rod 7 to make a movement along the inside to the outside of the front end cover 2. At the same time, the aforementioned return spring 8 is squeezed by the push plate 6 and the front end cover 2 to accumulate energy, the length of the return spring 8 is reduced, and the thrust arm of the brake is pushed by the push rod 7 to form a parking brake;

[0120] When the vehicle is in the process of engaging the parking brake, the aforementioned high-pressure chamber 110 is not injected with compressed air. At the same time, compressed air is injected into the first chamber 210, so that the pressure of the compressed air in the first chamber 210 is greater than the elastic force of the energy storage spring 12. At this time, the pressure of the compressed air in the first chamber 210 drives the piston 10, and the piston 10 produces a movement along the direction from the middle shell 1 to the energy storage cylinder 9, so that the energy storage spring 12 is squeezed by the energy storage cylinder 9 and the piston 10 to accumulate energy, and the length of the energy storage spring 12 is reduced. As the piston 10 moves, the piston 10 drives the piston shaft 11 to make a movement along the direction from the middle shell 1 to the energy storage cylinder 9. The movement causes the piston shaft 11 to retract into the first chamber 210; the push plate 6 and the diaphragm 3 in the service brake chamber 100 lose the driving force of the piston shaft 11. At this time, the return spring 8 releases energy, the length of the return spring 8 increases, and the return spring 8 drives the push plate 6 and the diaphragm 3 to move in the direction from the front end cover 2 to the middle shell 1, and the push plate 6 drives the isolation cylinder 4 and the push rod 7 to move in the direction from the outside to the inside of the front end cover 2, so that the isolation cylinder 4 and the push rod 7 retract into the normal pressure chamber 120; correspondingly, as the push rod 7 retracts into the normal pressure chamber 120, the brake thrust arm is reset and the parking brake is released.

[0121] It should be understood that the brake air chamber of this embodiment, in which a P12 port 140 for compressed air circulation is provided on the shell 1; the P12 port 140 is communicated with the first chamber 210, so that compressed air is injected into the first chamber 210 through the P12 port 140, and the compressed air in the first chamber 210 is discharged from the P12 port 140 to the outside of the first chamber 210 or outside the parking brake chamber 200.

[0122] Example 2:

[0123] This embodiment provides a commercial vehicle, comprising a brake and the brake chamber of the aforementioned embodiment 1;

[0124] The brake is provided with a thrust arm, and the thrust arm is provided with a second ball socket, and the output end 72 of the push rod 7 is inserted into the second ball socket.

[0125] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformation made by using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, is also included in the patent protection scope of the present invention.

Claims

1. Brake chamber, characterized in that: The service brake chamber comprises a service brake chamber constructed by a middle housing and a front end cover, wherein the service brake chamber forms a high-pressure chamber and a normal-pressure chamber through a diaphragm, a rigid isolation cylinder and a sealing assembly, wherein an isolation chamber is formed within the isolation cylinder, and the high-pressure chamber, the normal-pressure chamber and the isolation chamber are not interconnected, wherein the high-pressure chamber is located between the middle housing and the diaphragm, and the normal-pressure chamber is located between the diaphragm, the front end cover, the isolation cylinder and the sealing assembly; The isolation cylinder is connected to the diaphragm via a push plate, and the isolation cylinder is coaxially connected to the push plate; The front end cover is provided with a braking through hole. Along the axial direction of the isolation cylinder, the contour of the isolation cavity intersects with the contour of the braking through hole. The isolation cavity is connected to the atmosphere. Along the radial direction of the isolation cylinder, the gap between the isolation cylinder and the braking through hole is sealed by the sealing assembly. The sealing assembly is connected to the front end cover, and the isolation cylinder and the sealing assembly form a sliding pair. The isolation cylinder is provided with a push rod, and the two ends of the push rod are respectively a receiving end and an output end. The receiving end is confined in the isolation cavity, and the output end is located outside the isolation cavity, and the output end passes through the brake through hole and is located outside the front end cover.

2. The brake chamber according to claim 1, characterized in that The isolation cavity is limited to a blind hole structure; The two ends of the isolation cylinder are respectively a head end and a tail end, the tail end is connected to the push plate, and the isolation cavity is limited to be recessed in the isolation cylinder along the direction from the head end to the tail end.

3. The brake chamber according to claim 2, characterized in that: The sealing assembly includes a sealing seat, a first sealing ring, a second sealing ring, an oil seal, and a guide ring; The sealing seat is connected to the front end cover, the outline of the sealing seat covers the brake through hole, and the sealing seat is provided with a brake channel, which is coaxial with and intersects with the brake through hole; The isolation cylinder is inserted into the brake channel, and the gap between the isolation cylinder and the sealing seat is sealed by the first sealing ring; The two ends of the brake channel are respectively a head end and a tail end, the head end is located at the brake through hole, the tail end is located in the normal pressure cavity, and the oil seal is provided at the tail end; The oil seal comprises a mounting portion confined between the sealing seat and the isolation cylinder, and a lip portion confined outside the sealing seat and the isolation cylinder, wherein the mounting portion and the lip portion are integrally formed, and along the circumferential direction of the isolation cylinder, the lip portion is in an annular shape and contacts the isolation cylinder; The second sealing ring is located outside the front end cover and is coaxially connected to the sealing seat along the direction from the head end to the tail end; The inner surface of the sealing seat is recessed with a fourth positioning groove, and the guide ring is arranged in the fourth positioning groove, wherein the guide ring has an outer circumferential surface facing the sealing seat and an inner circumferential surface facing the isolation cylinder, the outer circumferential surface contacts the sealing seat, and the inner circumferential surface contacts the isolation cylinder.

4. The brake chamber according to claim 2, characterized in that: The receiving end is configured as a ball head; A first ball socket and a card slot are machined in the isolation cylinder. The first ball socket and the inner surface of the isolation cylinder form a first positioning opening. The opening direction of the first positioning opening is limited to the direction of the axis of the isolation cylinder. The card slot is recessed in the inner surface of the isolation cylinder. The outline of the card slot is perpendicular to the axis of the isolation cylinder. The card slot is located outside the first ball socket, and an installation space is formed between the outline of the card slot and the outline of the first ball socket. A plug snap ring and a retaining ring are provided in the isolation cylinder. The plug snap ring is provided in the installation space. The retaining ring is clamped into the clamping groove. The plug snap ring is confined between the first ball socket and the plug snap ring. The inner ring diameter of the plug snap ring is smaller than the diameter of the first positioning opening. The position of the receiving end is restricted by the head retaining ring to the position of the first ball socket.

5. The brake chamber according to claim 4, characterized in that: The isolation cavity and the end surface at the head end form a working opening, the diameter of the working opening is larger than the maximum diameter of the push rod, wherein the working opening is at least used to limit the swing angle of the push rod relative to the isolation cylinder.

6. The brake chamber according to claim 1, characterized in that A return spring is provided in the normal pressure chamber. The return spring is sleeved on the isolation cylinder and the sealing assembly. One end of the return spring contacts the front end cover, and the other end of the return spring contacts the push plate.

7. The brake chamber according to claim 1, characterized in that The vehicle further comprises a parking brake chamber constructed by the middle housing and the energy storage cylinder, wherein the parking brake chamber forms a first chamber and a second chamber through a piston, wherein the first chamber is located between the energy storage cylinder, the piston and the middle housing, and the second chamber is located between the energy storage cylinder and the piston; An energy storage spring is provided in the second chamber, one end of the energy storage spring contacts the energy storage cylinder, and the other end of the energy storage spring contacts the piston; A piston shaft is provided in the first chamber, and the two ends of the piston shaft are respectively an active end and a driven end. The middle shell is provided with a connecting through hole for being penetrated by the piston shaft, and the driven end is inserted into the connecting through hole. The piston is provided with a mounting groove, and the active end is inserted into the mounting groove, and the active end contacts the diaphragm.

8. A commercial vehicle comprising a brake, characterized in that Also includes a brake chamber according to any one of claims 1 to 7; The brake is provided with a thrust arm, the thrust arm is provided with a second ball socket, and the output end of the push rod is inserted into the second ball socket.

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