Brake cylinder and brake system

Abstract

The present invention belongs to the technical field of vehicle brake systems, and discloses a brake cylinder and a brake system, wherein the brake cylinder comprises a cylinder body and a piston, wherein the piston is slidably disposed in a receiving chamber of the cylinder body, and the cylinder body comprises a first opening and a sealing assembly for sealing the first opening; the sealing assembly comprises a sealing member and a biasing member, and the sealing member is sealed and connected to the first opening; the biasing member is disposed in the receiving chamber, and one end of the biasing member is pressed against the piston, and the other end is pressed against the sealing member, so that the sealing member seals and covers the first opening. In the brake cylinder, the biasing member presses the sealing member against the inner wall of the cylinder body in the axial direction and radial direction of the cylinder body, respectively, and the piston pushes the brake fluid in the receiving chamber to squeeze the sealing member in the axial direction and radial direction of the cylinder body, respectively, so that the sealing member presses against the inner wall of the cylinder body, thereby effectively preventing the brake fluid in the receiving chamber from leaking along the inner wall of the seal and the cylinder body, and the seal is not affected by temperature, and has a good sealing effect.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle brake systems, and in particular to a brake cylinder and a brake system. Background Art

[0002] At present, electrification and intelligence are the inevitable trends in the development of the automotive field. In the field of automobile chassis, the integrated braking system has become an indispensable system for the development of intelligent automobiles. The integrated braking system is a system involving mechanical, electronic, and hydraulic fields, integrating many hydraulic cylinders and oil circuits. Among them, the master cylinder of the integrated braking system is connected to the brake pedal. When the driver steps on the brake pedal to brake, the corresponding braking pressure will be established in the master cylinder, so the master cylinder must remain sealed to prevent brake fluid leakage.

[0003] The existing master cylinder has a sealing ring and a threaded fixed connection structure at the rear of the master cylinder to seal the master cylinder. This sealing structure is easily affected by temperature and has the hidden danger of leaking brake fluid, resulting in poor sealing performance of the master cylinder. Summary of the invention

[0004] The object of the present invention is to provide a brake cylinder and a brake system, which can avoid the influence of temperature on the sealing structure of the master cylinder and can effectively prevent the brake fluid in the master cylinder from leaking.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A brake cylinder comprises a cylinder body and a piston, wherein the piston is slidably disposed in an accommodating cavity of the cylinder body, and the cylinder body comprises a first opening and a sealing assembly for sealing the first opening;

[0007] The sealing assembly comprises:

[0008] a sealing member, the sealing member being sealingly connected to the first opening;

[0009] A biasing member is disposed in the accommodating cavity, one end of the biasing member is pressed against the piston, and the other end is pressed against the sealing member, so that the sealing member seals and covers the first opening.

[0010] Specifically, the seal includes a first sealing portion and a second sealing portion connected to the first sealing portion, wherein the second opening is formed at one axial end of the second sealing portion, and the first sealing portion is provided at the other end, wherein the radial dimension of the first sealing portion is smaller than the radial dimension of the second opening, and an axial end of the biasing member is pressed against the first sealing portion so that the seal seals and covers the first opening.

[0011] Specifically, the accommodating cavity includes a tapered cavity, and the second sealing portion is abutted against a tapered inner wall of the tapered cavity by the biasing force member.

[0012] Specifically, the sealing member further includes a connecting portion, the connecting portion is connected to the second opening of the second sealing portion, and the connecting portion is interference connected with the inner wall of the cylinder body.

[0013] Specifically, the sealing assembly further includes an open ring, which is embedded in the cylinder body and is used to axially fix the sealing member.

[0014] Specifically, the first sealing portion, the second sealing portion and the connecting portion of the sealing member are integrally formed.

[0015] Specifically, the biasing force member includes a first elastic portion and a second elastic portion connected to each other, the first elastic portion extends in a columnar spiral, the second elastic portion extends in a conical spiral, the first elastic portion presses against the piston, and the second elastic portion presses against the sealing member.

[0016] Specifically, the first elastic part is a straight spring; the second elastic part is a conical spring, or the second elastic part is a conical piece made of rubber material.

[0017] Specifically, a support end cover detachably connected to the cylinder body is further provided on the outer side of the first opening, and a support surface is provided on a side of the support end cover facing the first opening, and the support surface is used to support the sealing member.

[0018] A braking system comprises a brake pedal, a pedal simulator and a brake cylinder, wherein the brake pedal is transmission-connected to the input end of the pedal simulator, and the output end of the pedal simulator is transmission-connected to the piston of the brake cylinder, wherein the brake cylinder is the above-mentioned brake cylinder.

[0019] Beneficial effects of the present invention:

[0020] The object of the present invention is to provide a brake cylinder and a brake system, wherein the brake cylinder has a seal fixedly connected at the rear end of the cylinder body, the seal fits against the inner wall of the rear end of the cylinder body to seal the first opening, a biasing member is arranged in the cylinder body, the biasing member is always in a compressed state, one end of the biasing member along the axial direction is pressed against the piston, and the other end is pressed against the seal, so that the biasing member presses the seal against the inner wall of the cylinder body. It can be understood that the seal can undergo a certain elastic deformation, so that the axial force of the biasing member on the seal makes the seal fit closely against the inner wall of the cylinder body, so that the seal seals and covers the first opening of the cylinder body. The cover prevents the brake fluid in the accommodating chamber from leaking along the seal and the inner wall of the cylinder body; in particular, when the piston approaches the seal along the axial direction of the cylinder body, the piston applies an axial force to the biasing member, and at the same time, the piston pushes the brake fluid in the accommodating chamber to squeeze the seal along the axial and radial directions of the cylinder body respectively. The force acting on the biasing member and the brake fluid act on the seal at the same time, further pressing the seal to the inner wall of the cylinder body, thereby further preventing the brake fluid in the accommodating chamber from leaking between the seal and the inner wall of the cylinder body. At the same time, the seal of the brake cylinder is not affected by temperature and has a good effect of preventing brake fluid leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a structural schematic diagram of a brake cylinder provided by a specific embodiment of the present invention;

[0022] Figure 2 is a schematic structural diagram of a seal of a brake cylinder provided by a specific embodiment of the present invention;

[0023] Figure 3 It is a structural schematic diagram of a cylinder body of a brake cylinder provided in a specific embodiment of the present invention.

[0024] In the figure:

[0025] 1. Cylinder body; 11. Accommodating chamber; 111. Conical chamber; 112. First groove; 113. Second groove;

[0026] 2. Piston;

[0027] 3. Sealing member; 31. First sealing portion; 32. Second sealing portion; 33. Connecting portion; 331. Flanging;

[0028] 4. biasing member; 41. first elastic portion; 42. second elastic portion;

[0029] 5. Support end cap; 51. Support surface;

[0030] 6. Open ring. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0032] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0035] The master cylinder of the integrated brake system is connected to the brake pedal. When the driver steps on the brake pedal to brake, the corresponding brake pressure will be built up in the master cylinder. Therefore, the master cylinder must remain sealed to prevent brake fluid leakage. At present, the tail of the existing master cylinder is sealed by a sealing ring and a threaded fixed connection structure. This sealing structure is easily affected by temperature and has the risk of leaking brake fluid, resulting in poor sealing performance of the master cylinder.

[0036] The present invention provides a brake cylinder, such as Figure 1As shown, the brake cylinder includes a cylinder body 1 and a piston 2, the piston 2 is slidably arranged in the accommodating chamber 11 of the cylinder body 1, the cylinder body 1 includes a first opening and a sealing assembly for sealing the first opening; the sealing assembly includes a sealing member 3 and a biasing member 4, the sealing member 3 is sealingly connected to the first opening; the biasing member 4 is arranged in the accommodating chamber 11, one end of the biasing member 4 is pressed against the piston 2, and the other end is pressed against the sealing member 3, so that the sealing member 3 seals and covers the first opening.

[0037] like Figure 1 As shown, the brake cylinder is connected by fixing a seal 3 at the tail of the cylinder body 1, the seal 3 is fitted with the inner wall of the cylinder body 1 to seal the first opening, and a biasing member 4 is arranged in the cylinder body 1, the biasing member 4 is always in a compressed state, one end of the biasing member 4 along the axial direction is pressed against the piston 2, and the other end is pressed against the seal 3, so that the biasing member 4 presses the seal 3 against the inner wall of the cylinder body 1. It can be understood that the seal 3 can undergo a certain elastic deformation, so that the axial force of the biasing member 4 acting on the seal 3 makes the seal 3 fit closely with the inner wall of the cylinder body 1, so that the seal 3 seals and covers the first opening of the cylinder body 1, avoiding the accommodating chamber 11. The brake fluid leaks along the gap between the seal 3 and the inner wall of the cylinder body 1; in particular, when the piston 2 approaches the seal 3 along the axial direction of the cylinder body 1, the piston 2 applies a force to the biasing member 4 along the axial direction, and at the same time, the piston 2 also pushes the brake fluid in the accommodating chamber 11 to squeeze the seal 3 along the axial and radial directions of the cylinder body 1 respectively. The force acting on the biasing member 4 and the brake fluid act on the seal 3 at the same time, further pressing the seal 3 to the inner wall of the cylinder body 1, thereby further preventing the brake fluid in the accommodating chamber 11 from leaking from between the seal 3 and the inner wall of the cylinder body 1. At the same time, the seal 3 of the brake cylinder is not affected by the temperature and has a good effect of preventing brake fluid leakage.

[0038] Among them, Figure 1-3As shown, the seal 3 includes a first sealing portion 31 and a second sealing portion 32 connected to the first sealing portion 31, a second opening is formed at one axial end of the second sealing portion 32, and the first sealing portion 31 is provided at the other end, a radial dimension of the first sealing portion 31 is smaller than a radial dimension of the second opening, and an axial end of the biasing member 4 is pressed against the first sealing portion 31 so that the seal 3 is sealed and covers the first opening. A second opening is formed by setting an axial end of the second sealing portion 32, and a first sealing portion 31 is provided at the other end. Specifically, in the present embodiment, the second sealing portion 32 is tapered, thereby increasing the contact area between the biasing member 4 and the sealing member 3. At the same time, the brake fluid in the accommodating chamber 11 flows into the second sealing portion 32 from the second opening of the second sealing portion 32, increasing the flow rate of the brake fluid in the accommodating chamber 11 into the second sealing portion 32, so that the brake fluid in the accommodating chamber 11 quickly flows into the second sealing portion 32; wherein, when the biasing member 4 passes through the second opening and presses against the first sealing portion 31 of the sealing member 3, the biasing member 4 also presses the second sealing portion 32 of the sealing member 3 against the inner wall of the cylinder body 1 along the axial direction and radial direction of the cylinder body 1 respectively, and by setting the radial dimension of the first sealing portion 31 to be smaller than the radial dimension of the second opening, as shown in FIG. Figure 1 As shown, the second sealing portion 32 is fitted with the inner wall of the cylinder body 1 and is partially located outside the accommodating chamber 11 of the cylinder head 1, and the first sealing portion 31 is also located outside the accommodating chamber of the cylinder body 1, so that when the piston 2 approaches the sealing member 3 along the axial direction of the cylinder body 1, the force applied by the piston 2 to the biasing member 4 along the axial direction is transmitted to the sealing member 3, so that the first sealing portion 31 can undergo a certain elastic deformation along the axial direction of the cylinder body 1, thereby further pressing the second sealing portion 32 of the sealing member 3 against the inner wall of the cylinder body 1 along the axial direction and radial direction of the cylinder body 1, further strengthening the fitting effect of the second sealing portion 32 and the inner wall of the cylinder body 1, further improving the sealing performance of the sealing member 3, avoiding the leakage of the brake fluid in the accommodating chamber 11 along the inner wall of the seal 3 and the cylinder body 1, and improving the sealing performance of the brake cylinder. As an alternative, one end of the biasing member 4 along the axial direction is only pressed against the second sealing portion 32. It is also possible to press the second sealing portion 32 of the sealing member 3 against the inner wall of the cylinder body 1 along the axial direction and radial direction respectively.

[0039] In other embodiments, the seal 3 may also be in a cylindrical barrel shape. The brake fluid in the accommodating chamber 111 presses the seal 3 against the inner wall of the cylinder 1 along the axial direction and radial direction of the cylinder 1, and the biasing member 4 presses the seal 3 against the inner wall of the cylinder 1 along the axial direction of the cylinder 1.

[0040] Specifically, the accommodating chamber 11 includes a tapered chamber 111, and the second sealing portion 32 abuts against the tapered inner wall of the tapered chamber 111 under the action of the biasing member 4. In this embodiment, the second sealing portion 32 is tapered, and the second sealing portion 32 is adapted to the tapered chamber 111. When the biasing member 4 passes through the second opening and abuts against the first sealing portion 31 of the seal 3, the biasing member 4 also presses the second sealing portion 32 of the seal 3 against the tapered inner wall of the tapered chamber 111 along the axial direction and radial direction of the cylinder body 1, respectively, so that the second sealing portion 32 is closely fitted with the tapered inner wall of the tapered chamber 111, thereby preventing the brake fluid in the accommodating chamber 11 from leaking along the tapered inner wall between the seal 3 and the tapered chamber 111, and improving the sealing performance of the brake cylinder.

[0041] Among them, Figure 1-3 As shown, the seal 3 further includes a connecting portion 33, which is connected to the second opening of the second sealing portion 32, and the connecting portion 33 is in interference connection with the inner wall of the cylinder body 1. It can be understood that connecting the connecting portion 33 to the second opening of the second sealing portion 32, that is, connecting the connecting portion 33 to the large end of the second sealing portion 32, increases the flow rate of the brake fluid in the accommodating chamber 11 into the second sealing portion 32, so that the brake fluid in the accommodating chamber 11 quickly flows into the tapered chamber 111; by interferingly connecting the connecting portion 33 of the seal 3 with the inner wall of the cylinder body 1, the seal 3 can be assembled to the cylinder body 1 while preventing the brake fluid in the cylinder body 1 from leaking from the connection between the connecting portion 33 and the cylinder body 1. Specifically, in the present embodiment, the connecting portion 33 is provided with a flange 331, and the inner wall of the cylinder body 1 is provided with a first groove 112, and the flange 331 is interference-fitted into the first groove 112, so that when the seal 3 is assembled to the cylinder body 1, the brake fluid in the accommodating chamber 11 is prevented from leaking from the connection between the flange 331 and the first groove 112 on the inner wall of the cylinder body 1; at the same time, the biasing force member 4 presses the second sealing portion 32 against the conical inner wall of the conical cavity 111. It can be understood that even if the brake fluid in the accommodating chamber 11 leaks from the connection between the flange 331 and the first groove 112 of the cylinder body 1, the biasing force member 4 presses the second sealing portion 32 of the seal 3 against the conical inner wall of the conical cavity 111, which can effectively prevent the brake fluid from leaking from between the seal 3 and the conical inner wall of the conical cavity 111.

[0042] The sealing assembly further includes an open ring 6, which is embedded in the cylinder body 1 and used to axially fix the seal 3. With such an arrangement, the open ring 6 can limit the assembly position of the seal 3 in the axial direction, thereby preventing the seal 3 from axially moving along the cylinder body 1, and further ensuring the sealing performance of the seal 3. Specifically, in the embodiment, the cylinder wall at the rear of the cylinder body 1 is provided with a second groove 113 connected to the first groove 112, the open ring 6 is embedded in the second groove 113, and the open ring 6 is respectively pressed against the side wall and the connecting portion 33 of the second groove 113 in the axial direction of the cylinder body 1. In this way, the open ring 6 presses the connecting portion 33 of the seal 3 against the side wall of the first groove 112, thereby limiting the assembly position of the seal 3, preventing the seal 3 from axially moving along the cylinder body 1, and further ensuring the sealing performance of the seal 3.

[0043] Specifically, the open ring 6 is made of metal material. Preferably, the open ring 6 is made of steel. The open ring 6 made of steel has good structural strength and a certain elastic deformation ability.

[0044] More specifically, a sealing ring is provided in the second groove 113, and the sealing ring and the open ring 6 are arranged at intervals, and the sealing ring is close to the central axis of the cylinder body 1 along the radial direction of the cylinder body 1. In this way, the sealing ring can prevent the brake fluid in the accommodating chamber 11 from flowing from the second groove 113 into the connection between the first groove 112 and the flange 331, thereby further enhancing the sealing effect of the seal 3.

[0045] The first sealing part 31, the second sealing part 32 and the connecting part 33 of the sealing member 3 are integrally formed. The structural strength of the sealing member 3 can be enhanced, and cracks or breaks of the sealing member 3 at the connection between the first sealing part 31 and the second sealing part 32, and at the connection between the second sealing part 32 and the connecting part 33 under the action of the biasing member 4 and the brake fluid can be avoided, thereby further improving the working performance of the sealing member 3. As an alternative, the large end of the second sealing part 32 of the sealing member 3 can also be welded to the connecting part 33, and the small end of the second sealing part 32 can be welded to the first sealing part 31.

[0046] The seal 3 is made of a metal plate. It is understood that the metal plate is a thin plate with good structural strength and can ensure that the seal 3 has a certain elastic deformation. In other embodiments, the seal 3 can also be made of non-metallic materials.

[0047] Among them, Figure 1 and Figure 3As shown, the biasing member 4 includes a first elastic part 41 and a second elastic part 42 connected to each other, the first elastic part 41 extends in a cylindrical spiral, the second elastic part 42 extends in a conical spiral, the first elastic part 41 is pressed against the piston 2, and the second elastic part 42 is pressed against the first sealing part 31. By setting the first elastic part 41 to extend in a cylindrical spiral, the second elastic part 42 to extend in a conical spiral, the first elastic part 41 is pressed against the piston 2 in the axial direction, and the end of the second elastic part 42 in the axial direction is pressed against the first sealing part 31, the shapes of the second elastic part 42 and the second sealing part 32 are adapted, so that the second elastic part 42 is also pressed against the inner side wall of the second sealing part 32, the contact area between the second elastic part 42 and the second sealing part 32 is increased, the sealing performance of the sealing member 3 is improved, and the second sealing part 32 of the sealing member 3 is evenly stressed, thereby increasing the service life of the sealing member 3; at the same time, the second elastic part 42 is adapted to the structure of the conical cavity 111, so as to improve the space utilization rate of the brake cylinder, and also increase the elastic force range of the biasing member 4.

[0048] Specifically, the first elastic part 41 is a straight spring; the second elastic part 42 is a conical spring, or the second elastic part 42 is a conical part made of rubber material. In this embodiment, the first elastic part 41 is a straight spring, the second elastic part 42 is a conical spring, the first elastic part 41 abuts against the piston 2 in the axial direction, the end of the second elastic part 42 in the axial direction abuts against the first sealing part 31, and the second elastic part 42 abuts against the second sealing part 32 in the axial direction and radial direction respectively, so that the second sealing part 32 is uniformly stressed in the axial direction and radial direction, so that the outer wall of the second sealing part 32 is uniformly pressed against the conical inner wall of the conical cavity 111.

[0049] More specifically, the first elastic portion 41 and the second elastic portion 42 of the biasing member 4 are integrally formed to ensure the working performance of the biasing member 4 .

[0050] Specifically, the piston 2 is provided with a limiting groove, and one end of the first elastic part 41 close to the piston 2 is located in the limiting groove. The limiting groove can limit the assembly position of the biasing member 4 along the radial direction of the cylinder body 1, and can effectively prevent the first elastic part 41 from contacting the side wall of the accommodating chamber 11, thereby preventing the first elastic part 41 from scratching the side wall of the accommodating chamber 11, thereby preventing the brake fluid in the accommodating chamber 11 from leaking from between the piston 2 and the side wall of the accommodating chamber 11, and also reducing the maintenance cost of the brake cylinder.

[0051] As an alternative, the first elastic part 41 is a straight spring, and the second elastic part 42 is a conical part made of rubber material. It is understandable that the second elastic part 42 is a solid conical part made of rubber material, and the shape of the conical part is adapted to the shape of the second sealing part 32, and can be completely fitted to the side walls of the first sealing part 31 and the second sealing part 32, so that under the action of the first elastic part 41 of the biasing force member 4, the second elastic part 42 is pressed against the second sealing part 32 in the axial direction and radial direction respectively, so that the second sealing part 32 is evenly stressed in the axial direction and radial direction, so that the side wall of the second sealing part 32 is evenly pressed against the conical inner wall of the conical cavity 111.

[0052] Among them, Figure 1 As shown, a support end cover 5 detachably connected to the cylinder body 1 is provided on the outer side of the first opening, and a support surface 51 is provided on the side of the support end cover 5 facing the first opening, and the support surface 51 is used to support the seal 3. It can be understood that the seal 3 is elastic and can undergo a certain elastic deformation. When the biasing force member 4 and / or the brake fluid exerts a force on the seal 3, the seal 3 has a deformation tendency to approach the support end cover 5 in the axial direction. Therefore, by providing the support end cover 5, the support surface 51 of the support end cover 5 can support the seal 3. It can be understood that there is a gap between the support surface 51 of the support end cover 5 and the first sealing portion 31, which can not only ensure that the seal 3 can undergo a certain deformation in the axial direction, but also limit the deformation amount of the seal 3 in the axial direction, so as to protect the first sealing portion 31 of the seal 3 and the connection between the first seal 31 and the second sealing portion 32 from breaking; at the same time, the cylinder body 1 is detachably connected with the support end cover 5, which can facilitate the assembly, disassembly and replacement of the seal 3, thereby reducing the maintenance cost of the brake cylinder.

[0053] Specifically, the support surface 51 is provided with an elastic cushion layer, and the first sealing portion 31 can abut against the elastic cushion layer. In this way, when the seal 3 approaches the support end cover 5 in the axial direction, the elastic cushion layer contacts the first sealing portion 31, and the elastic cushion layer can be elastically deformed, so that the seal 3 can be effectively buffered to avoid damaging the structure of the seal 3, further reducing the maintenance cost of the brake cylinder.

[0054] Specifically, the support end cover 5 is provided with an internal thread, and the cylinder body 1 is provided with an external thread, and the internal thread and the external thread are threadedly matched. Such a configuration facilitates the assembly and disassembly of the seal 3; at the same time, even if the brake fluid leaks from between the second sealing portion 32 and the tapered inner wall of the tapered cavity 111, the support end cover 5 can further prevent the brake fluid leaked from between the second sealing portion 32 and the tapered inner wall of the tapered cavity 111 from flowing out from the support end cover 5. As an alternative, the support end cover 5 and the cylinder body 1 are screwed in sequence by screws; or the support end cover 5 is clamped to the cylinder body 1.

[0055] Among them, this embodiment also provides a braking system, which includes the above-mentioned brake cylinder.

[0056] The brake system includes a brake pedal, a pedal simulator and a brake cylinder, wherein the brake pedal is connected to the input end of the pedal simulator, and the output end of the pedal simulator is connected to the piston 2 of the brake cylinder, wherein the brake cylinder is the above-mentioned brake cylinder, thereby driving the piston 2 of the brake cylinder to slide along the axial direction of the cylinder body 1 and to be located in the accommodating chamber 11 of the cylinder body 1.

[0057] Among them, the cylinder body 1 can be a separate component in the brake cylinder, or the brake cylinder can be integrated into the valve body of the brake system, that is, a hydraulic cavity is directly set in the valve body, and the cavity wall of the hydraulic cavity of the valve body is used as the inner wall of the cylinder body 1 to make an integrated brake cylinder.

[0058] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A brake cylinder, comprising a cylinder body (1) and a piston (2), wherein the piston (2) is slidably disposed in a receiving cavity (11) of the cylinder body (1), and the cylinder body (1) comprises a first opening and a sealing assembly for sealing the first opening; It is characterized in that The sealing assembly comprises: A sealing member (3), the sealing member (3) being sealingly connected to the first opening; A biasing member (4) is disposed in the accommodating chamber (11), one end of the biasing member (4) being pressed against the piston (2) and the other end being pressed against the sealing member (3) so that the sealing member (3) is sealed and covers the first opening; The sealing member (3) comprises a first sealing portion (31) and a second sealing portion (32) connected to the first sealing portion (31); the second sealing portion (32) is tapered; one axial end of the second sealing portion (32) forms a second opening; the other end is provided with the first sealing portion (31); the radial dimension of the first sealing portion (31) is smaller than the radial dimension of the second opening; one axial end of the biasing member (4) is pressed against the first sealing portion (31) so that the sealing member (3) is sealed and covers the first opening; The accommodating cavity (11) comprises a tapered cavity (111), and the second sealing portion (32) is abutted against the tapered inner wall of the tapered cavity (111) by the action of the biasing member (4); The sealing member (3) further comprises a connecting portion (33), wherein the connecting portion (33) is connected to the second opening of the second sealing portion (32), and the connecting portion (33) is interference-connected with the inner wall of the cylinder body (1).

2. The brake cylinder according to claim 1, characterized in that: The sealing assembly further comprises an open ring (6), wherein the open ring (6) is embedded in the cylinder body (1) and is used to axially fix the sealing element (3).

3. The brake cylinder according to claim 1, characterized in that: The first sealing portion (31), the second sealing portion (32) and the connecting portion (33) of the sealing member (3) are integrally formed.

4. The brake cylinder according to claim 1, characterized in that: The biasing force member (4) comprises a first elastic portion (41) and a second elastic portion (42) connected to each other, wherein the first elastic portion (41) extends in a columnar spiral, and the second elastic portion (42) extends in a conical spiral, the first elastic portion (41) is pressed against the piston (2), and the second elastic portion (42) is pressed against the sealing member (3).

5. The brake cylinder according to claim 4, characterized in that: The first elastic part (41) is a straight spring; the second elastic part (42) is a conical spring, or the second elastic part (42) is a conical part made of rubber material.

6. The brake cylinder according to any one of claims 1 to 5, characterized in that: A support end cover (5) detachably connected to the cylinder body (1) is also provided on the outer side of the first opening, and a support surface (51) is provided on the side of the support end cover (5) facing the first opening, and the support surface (51) is used to support the sealing element (3).

7. A braking system comprising a brake pedal, a pedal simulator and a brake cylinder, wherein the brake pedal is transmission-connected to an input end of the pedal simulator, and an output end of the pedal simulator is transmission-connected to a piston (2) of the brake cylinder, characterized in that: The brake cylinder is the brake cylinder according to any one of claims 1 to 6.

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