Brake cylinder

Abstract

The utility model relates to the technical field of vehicle parts, and provides a brake cylinder which comprises an air cylinder barrel, a supporting ring, a piston body, a piston rod and a guiding device, the air cylinder barrel comprises a cylinder body and a cover body, and the cover body is arranged at an opening of the cylinder body in a covering mode; the piston is installed in the cylinder body, one end of the piston rod is connected with the piston body, and the other end of the piston rod penetrates through the cover body; the supporting ring and the guiding device are arranged at the two ends, in the axial direction of the piston rod, of the piston body respectively, the supporting ring is connected with the piston body, and at least part of the guiding device is connected with the end face, away from the supporting ring, of the piston body. The overall rigidity of the piston body can be effectively improved through the supporting ring and the guiding device, so that the piston body and the piston rod penetrating through the cover body can do directional reciprocating motion in the axial direction of the piston rod, and then normal work of the brake cylinder is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle parts, in particular to a brake cylinder. Background Art

[0002] The vehicle's brake cylinder is a component that transfers the air pressure acting on its piston to the brake shoe through the basic braking device, so that the brake shoe holds the wheel tightly to produce a braking effect, and at the same time converts the air pressure into mechanical thrust.

[0003] In the relevant technology, the brake cylinder mainly includes a cylinder body, a cover body, a piston body, a piston rod and a support ring. The piston body is installed in the cylinder body, the piston rod is connected to the piston body, the support ring is sleeved outside the piston body to support the piston body, the cover body is sealed and connected to the cylinder body, and the two are combined to form a cylinder barrel, which has a rod cavity. The piston rod can perform linear reciprocating motion under the action of air pressure in the rod cavity.

[0004] However, due to the low rigidity of the support ring, when compressed gas is filled in the rod cavity, the internal air pressure rises rapidly, which may cause deformation due to insufficient external support of the piston body, resulting in serpentine motion of the piston body in the cylinder barrel, causing the piston rod to tilt and get stuck, thereby affecting the normal operation of the brake cylinder. Utility Model Content

[0005] The problem solved by the utility model is how to ensure that the piston body and the piston rod of the brake cylinder can reciprocate in a directional manner along the axial direction of the piston rod.

[0006] In order to solve the above-mentioned problems, the utility model provides a brake cylinder, comprising a cylinder barrel, a support ring, a piston body, a piston rod and a guide device, the cylinder barrel comprising a cylinder body and a cover body, the cover body is arranged on the opening of the cylinder body; the piston body, the guide device and the support ring are installed in the cylinder body, one end of the piston rod is connected to the piston body, and the other end of the piston rod is passed through the cover body; the support ring and the guide device are respectively arranged on both ends of the piston body along the axial direction of the piston rod, the support ring is connected to the piston body, and at least part of the guide device is connected to the end of the piston body away from the support ring.

[0007] Optionally, the guiding device comprises an annular supporting portion, and the annular supporting portion is arranged in close contact with the end of the piston body away from the supporting ring.

[0008] Optionally, the guide device includes an annular guide portion, the annular guide portion is connected to the circumferential edge of the annular support portion, and the annular guide portion abuts against the circumferential inner wall of the cylinder body.

[0009] Optionally, the support ring is coaxially arranged with the piston body, and the support ring is clamped with the piston body, the piston rod is connected to the end of the piston body away from the support ring, and the circumferential edge of the support ring is abutted against the inner wall of the cylinder body.

[0010] Optionally, the brake cylinder also includes a piston diaphragm, which is located between the end of the cylinder body away from the cover body and the piston body, and is connected to the end of the piston body facing the support ring, and the end of the piston diaphragm facing the piston body abuts against the support ring.

[0011] Optionally, the piston diaphragm includes a diaphragm body, a first abutment portion and a second abutment portion, the diaphragm body is a disc structure, the diaphragm body is tightly arranged against the piston body, the diaphragm body is bent toward the circumferential side wall of the cylinder body to form the first abutment portion, the first abutment portion abuts against the end of the support ring away from the piston rod, the first abutment portion is bent toward an end of the cylinder body away from the cover body to form the second abutment portion, and the second abutment portion abuts against the circumferential inner wall of the cylinder body.

[0012] Optionally, the piston body comprises a first connecting portion and a piston portion, the piston portion is arranged around the first connecting portion, the first connecting portion is connected to the piston rod, and the piston portion abuts against the circumferential inner wall of the cylinder body;

[0013] A middle portion of the annular support portion is provided with an escape opening for the first connection portion to pass through, and the annular support portion covers at least a portion of the first connection portion.

[0014] Optionally, the brake cylinder also includes a dust cover, and the piston diaphragm and the dust cover are respectively arranged on both sides of the piston rod along its own axial direction; the dust cover includes a cover body and a second connecting part, the cover body is extended along the axial direction of the piston rod, and the cover body extends along the axial direction of the piston rod to form the second connecting part, the second connecting part is connected to the cover body, and the cover body is sleeved outside the piston rod.

[0015] Optionally, the cylinder barrel further includes a dust filter, the cover body is provided with a breathing port, and the dust filter is installed at the breathing port.

[0016] Optionally, the dust filter is formed by sintering powder metallurgy materials.

[0017] Compared with the prior art, the cylinder barrel in the utility model mainly includes a cylinder body and a cover body, and an opening may be provided at one end of the cylinder body facing the cover body, wherein the support ring, the piston body, the piston rod and the guide device may be installed in the cylinder body from the opening, and connected with the opening of the cylinder body through the cover body to assemble and form a cylinder barrel with a sealed structure. Since the support ring and the guide device are respectively installed on the two end surfaces of the piston body along the axial direction of the piston rod, the overall rigidity of the piston body can be effectively increased through the support ring and the guide device, so as to prevent the piston body from being deformed due to the excessive increase of air pressure when the cylinder barrel is inflated, and to avoid the piston body from generating serpentine motion in the cylinder barrel, so that the piston body and the piston rod passing through the cover body can reciprocate along the axial direction of the piston rod, thereby ensuring the normal operation of the brake cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is one of the cross-sectional structural schematic diagrams of the brake cylinder in the embodiment of the utility model;

[0019] Figure 2 This is a schematic cross-sectional structure diagram of a guide device in an embodiment of the utility model;

[0020] Figure 3 This is a schematic diagram of the explosion structure of the guide device in the embodiment of the utility model;

[0021] Figure 4 This is the second schematic cross-sectional structure diagram of the brake cylinder in the embodiment of the utility model;

[0022] Figure 5 This is the third schematic diagram of the cross-sectional structure of the brake cylinder in the embodiment of the utility model;

[0023] Figure 6 It is a schematic diagram of the structure of a dust filter in the prior art;

[0024] Figure 7 It is a schematic diagram of the structure of the dust filter in the embodiment of the utility model.

[0025] Description of reference numerals:

[0026] 1-cylinder barrel; 11-cylinder body; 12-cover body; 13-dust filter; 2-support ring; 3-piston body; 31-first connecting part; 32-piston part; 4-piston rod; 5-guide device; 51-annular supporting part; 52-annular guiding part; 6-piston diaphragm; 61-diaphragm body; 62-first abutting part; 63-second abutting part; 7-dust cover; 8-relief spring. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0028] It should be noted that in the coordinate system XZ provided herein, the positive direction of the X axis represents the right, the reverse direction of the X axis represents the left, the positive direction of the Z axis represents the top, and the reverse direction of the Z axis represents the bottom. At the same time, it should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described herein can be implemented in an order other than those illustrated or described herein.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the description of this specification, the description with reference to the terms "embodiment", "one embodiment" and "one implementation" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or implementation are included in at least one embodiment or implementation of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or implementation. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or implementations in a suitable manner.

[0031] In order to solve the above technical problems, an embodiment of the utility model provides a brake cylinder, including a cylinder barrel 1, a support ring 2, a piston body 3, a piston rod 4 and a guide device 5, the cylinder barrel 1 includes a cylinder body 11 and a cover body 12, the cover body 12 is covered at the opening of the cylinder body 11; the piston body 3, the guide device 5 and the support ring 2 are installed in the cylinder body 11, one end of the piston rod 4 is connected to the piston body 3, and the other end of the piston rod 4 is passed through the cover body 12; the support ring 2 and the guide device 5 are respectively arranged at both ends of the piston body 3 along the axial direction of the piston rod 4, the support ring 2 is connected to the piston body 3, and at least a part of the guide device 5 is connected to the end of the piston body 3 away from the support ring 2.

[0032] It should be noted that the cylinder barrel 1 is equivalent to the outer shell of the brake cylinder, and the support ring 2, the piston body 3, the piston rod 4 and the guide device 5 are installed in the cylinder barrel 1, a part of the piston rod 4 is in the cylinder body 11 of the cylinder barrel 1, and the other part of the piston rod 4 extends out of the cover body 12. There is a rod chamber in the cylinder barrel 1. When compressed gas is filled into the rod chamber, the compressed gas pushes the piston body 3 and the piston rod 4 to move in an axial direction of the piston rod 4. Since the support ring 2 and the guide device 5 are respectively installed at the two axial ends of the piston body 3 along the piston rod 4, the rigidity of the piston body 3 is enhanced from the opposite sides by the support ring 2 and the guide device 5, respectively, to ensure that the piston body 3 will not produce a serpentine motion during the axial movement in the rod chamber, and accordingly the piston rod 4 will also reciprocate in its own axial direction.

[0033] Among them, the axial direction of the piston rod 4 is Figure 1 The X-axis is parallel to the coordinate system.

[0034] Among them, at least a part of the guide device 5 is connected to the end of the piston body 3 away from the support ring 2, which means that the entire guide device 5 is connected and fixed to the end of the piston body 3; or, a part of the structure of the guide device 5 is connected and fixed to the end face of the piston body 3, and another part of the structure of the guide device 5 abuts against the circumferential side wall of the cylinder body 11.

[0035] The cylinder barrel 1 in this embodiment mainly includes a cylinder body 11 and a cover body 12. An opening may be provided at one end of the cylinder body 11 facing the cover body 12, wherein the support ring 2, the piston body 3, the piston rod 4 and the guide device 5 may be installed in the cylinder body 11 from the opening, and connected to the opening of the cylinder body 11 through the cover body 12 to assemble and form a cylinder barrel 1 with a sealed structure. Since the support ring 2 and the guide device 5 are respectively installed on the two end surfaces of the piston body 3 along the axial direction of the piston rod 4, the overall rigidity of the piston body 3 can be effectively increased through the support ring 2 and the guide device 5, so as to prevent the piston body 3 from being deformed due to the excessive increase of air pressure when the cylinder barrel 1 is inflated, and to prevent the piston body 3 from generating a serpentine motion in the cylinder barrel 1, so that the piston body 3 and the piston rod 4 penetrating the cover body 12 can reciprocate along the axial direction of the piston rod 4, thereby ensuring the normal operation of the brake cylinder.

[0036] In one embodiment of the present invention, Figure 2 , Figure 3 and Figure 5 As shown, the guide device 5 comprises an annular support portion 51 , and the annular support portion 51 is arranged in close contact with the end of the piston body 3 away from the support ring 2 .

[0037] It should be noted that the support ring 2 can be arranged on the side of the piston body 3 away from the piston rod 4, and the annular support portion 51 of the guide device 5 can be arranged on the side of the piston body 3 away from the support ring 2, that is, the annular support portion 51 in the guide device 5 and the piston rod 4 are on the same side of the piston body 3; since the support ring 2 is connected to the piston body 3, for example, the left end face, the rigidity of the left end face of the piston body 3 can be improved by the support ring 2, and the annular support portion 51 is tightly arranged to the end face of the piston body 3 away from the support ring 2, for example, the right end face, so that the rigidity of the right end face of the piston body 3 can be effectively improved by the annular support portion 51. In other words, the support ring 2 and the annular support portion 51 cooperate with each other to effectively improve the overall rigidity of the piston body 3 and reduce the possibility of deformation of the piston body 3 to prevent the piston body 3 from generating serpentine motion when moving in the cylinder barrel 1.

[0038] The left end face of the piston body 3 refers to the left end face of the piston body 3 at Figure 4 The end face opposite to the X axis in the coordinate system, the right end face of the piston body 3 refers to the end face of the piston body 3 in the Figure 4 The end face on the positive direction of the X axis in the coordinate system.

[0039] The shapes of the piston body 3 and the annular support portion 51 match each other to improve the tightness of the connection between the annular support portion 51 and the piston body 3 and prevent the two from loosening. The piston body 3 and the annular support portion 51 can be fixedly connected in a variety of ways, for example, the piston body 3 is fixedly connected to the annular support portion 51 by means of sealant or multiple rivets to improve the firmness of the connection between the two.

[0040] In one embodiment of the present invention, Figure 5 As shown, the guide device 5 includes an annular guide portion 52 , which is connected to the circumferential edge of the annular support portion 51 , and the annular guide portion 52 abuts against the circumferential inner wall of the cylinder body 11 .

[0041] It should be noted that the annular support portion 51 and the annular guide portion 52 can be connected in the following manner, for example, the circumferential edge of the annular support portion 51 is bent and extended toward the cover body 12 to form the annular guide portion 52, and the annular guide portion 52 and the annular support portion 51 can be an integrally formed structure, thereby improving the mechanical rigidity of the guide device 5 and effectively preventing the guide device 5 from being offset and misaligned when it moves axially in the cylinder barrel 1.

[0042] Since the annular guide portion 52 is in abutment against the circumferential inner wall of the cylinder body 11 in the cylinder barrel 1, and the annular support portion 51 is connected to the end face of the piston body 3, when the piston body 3 reciprocates axially along the piston rod 4 in the cylinder body 11 of the cylinder barrel 1, the annular guide portion 52 is always in sealing contact with the circumferential inner wall of the cylinder body 11, and as the piston body 3 reciprocates axially in a straight line along the piston rod 4, the annular guide portion 52 can guide the piston body 3 and the piston rod 4, further preventing the piston body 3 and the piston rod 4 from being misaligned or offset, so as to ensure that the piston body 3 and the piston rod 4 can reciprocate axially in a directed manner in the cylinder barrel 1, so as to correspondingly improve the stability of the reciprocating motion of the piston body 3 and the piston rod 4 in the cylinder barrel 1.

[0043] In one embodiment of the present invention, Figure 1 and Figure 4 As shown, the support ring 2 is coaxially arranged with the piston body 3, and the support ring 2 is clamped with the piston body 3, the piston rod 4 is connected to the end of the piston body 3 away from the support ring 2, and the circumferential edge of the support ring 2 is abutted against the inner wall of the cylinder body 11.

[0044] It should be noted that the support ring 2 is coaxially arranged with the piston body 3, and the support ring 2 can be clamped with the circumferential edge of the piston body 3, which not only makes the supporting force of the piston body 3 uniform at the circumferential edge, but also improves the stiffness of the piston body 3 at its own edge, and the clamping of the two can also improve the convenience and stability of assembly between the two.

[0045] One end of the piston rod 4, for example the left end, can be connected to the end face of the piston body 3 away from the support ring 2, for example the right end face, and the circumferential edge of the support ring 2 abuts against the inner wall of the cylinder body 11, so that when the piston body 3 is pushed by the compressed air in the rod chamber of the cylinder barrel 1 to drive the piston rod 4 to reciprocate along the axial direction of the piston rod 4, the circumferential edge of the support ring 2 can slide left and right on the circumferential inner wall of the cylinder body 11 along the axial direction of the piston rod 4. At this time, the support ring 2 can not only increase the rigidity of the piston body 3, but also play a certain guiding role in the axial movement of the piston body 3.

[0046] In the above embodiment, the support ring 2 can be clamped with the piston body 3 in the following manner. Specifically, the support ring 2 is provided with an annular groove on the side facing the piston body 3, and the piston body 3 is provided with an annular protrusion, which is embedded in the annular groove, thereby realizing the clamping assembly operation of the support ring 2 and the piston body 3.

[0047] In one embodiment of the present invention, Figure 4As shown, the brake cylinder also includes a piston diaphragm 6, which is located between the end of the cylinder body 11 away from the cover body 12 and the piston body 3, and the piston diaphragm 6 is connected to the end of the piston body 3 toward the support ring 2, and the end of the piston diaphragm 6 toward the piston body 3 abuts against the support ring 2.

[0048] It should be noted that the piston diaphragm 6 is located between the end of the cylinder 11 away from the cover body 12 and the piston body 3, and the piston diaphragm 6 is connected to the left end face of the piston body 3, so that when the piston diaphragm 6 returns to the end of the cylinder 11 away from the cover body 12 along with the piston body 3, the piston diaphragm 6 can play a certain buffering role for the piston body 3, thereby preventing the piston body 3 from increasing the degree of deformation due to direct contact with the piston diaphragm 6, thereby correspondingly extending the service life of the piston body 3.

[0049] Since the end edge of the piston diaphragm 6 facing the piston body 3 can abut against the support ring 2, the right end edge of the piston diaphragm 6 can press the support ring 2 onto the piston body 3 to enhance the connection stability between the piston body 3 and the support ring 2.

[0050] In one embodiment of the present invention, Figures 3 to 5 As shown, the piston diaphragm 6 includes a diaphragm body 61, a first abutment portion 62 and a second abutment portion 63. The diaphragm body 61 is a disc structure. The diaphragm body 61 is tightly arranged with the piston body 3. The diaphragm body 61 is bent toward the circumferential side wall of the cylinder body 11 to form the first abutment portion 62. The first abutment portion 62 abuts against the end of the support ring 2 away from the piston rod 4. The first abutment portion 62 is bent toward the end of the cylinder body 11 away from the cover body 12 to form the second abutment portion 63. The second abutment portion 63 abuts against the circumferential inner wall of the cylinder body 11.

[0051] It should be noted that the diaphragm body 61, the first abutting portion 62 and the second abutting portion 63 can be an integrally formed structure, thereby increasing the rigidity of the piston diaphragm 6 and correspondingly extending its service life. Since the piston body 3 is a disc structure, the diaphragm body 61 is also a disc structure, thereby increasing the tightness of the connection between the two.

[0052] Since the diaphragm body 61 of the piston diaphragm 6 is connected to the end face of the piston body 3 toward the support ring 2, and the second abutting portion 63 of the piston diaphragm 6 abuts against the circumferential inner wall of the cylinder body 11, a rod cavity can be formed between the piston diaphragm 6 and the end of the cylinder body 11 away from the cover body 12. When compressed gas is filled into the rod cavity, the compressed gas can exert a force on the piston diaphragm 6 to push the piston body 3 and the piston rod 4 to move rightward along the axial direction of the piston rod 4. Therefore, the piston diaphragm 6 can not only increase the sealing between the piston body 3 and the circumferential inner wall of the cylinder body 11, but also play a buffering role when the piston body 3 returns to the end of the cylinder body 11 away from the cover body 12, so as to reduce the deformation and extrusion degree of the piston body 3, and correspondingly extend the service life of the piston body 3.

[0053] Since the first abutment portion 62 abuts against the end of the support ring 2 away from the piston rod 4, the support ring 2 can be pressed against the piston body 3 through the first abutment portion 62, which not only improves the clamping firmness of the support ring 2 and the piston body 3, but also prevents displacement and misalignment during the axial movement of the piston body 3, thereby ensuring the axial directional reciprocating motion of the piston body 3 and the piston rod 4.

[0054] in, Figure 1 , Figures 3 to 5 , which is a cross-sectional view formed by cutting the brake cylinder along the plane where the coordinate system XZ is located, so as to show the internal structure of the cylinder tube 1.

[0055] The piston body 3 and the piston rod 4 can be connected and fixed by bolt fasteners, and the diaphragm body 61 and the piston body 3 can be fixed by bonding, riveting, etc., which are not specifically limited here; in order to improve the connection stability between the diaphragm body 61 and the piston body 3, the diaphragm body 61 and the piston body 3 can be fixed at multiple different positions.

[0056] Among them, combined Figure 4 and Figure 5 As shown, the brake cylinder further includes a release spring 8, which is sleeved outside the piston rod 4, and two ends of the release spring 8 are respectively in contact with the annular support portion 51 of the guide device 5 and the cover body 12.

[0057] The brake cylinder can be applied to the braking system of an automobile. For example, the brake system is connected to the brake shoe of the vehicle to clamp or loosen the wheel through the brake shoe. It can also be used as a single-acting telescopic reciprocating cylinder in other scenarios requiring linear reciprocating motion.

[0058] The working process of the brake cylinder is as follows: when compressed air enters the cylinder cavity on the left side of the piston diaphragm 6, the air pressure in the cylinder cavity increases due to the compressed air, so as to push the piston body 3 through the piston diaphragm 6 to drive the piston rod 4 and the relief spring 8 to move to the right. In this process, the relief spring 8 is continuously compressed, and the right end of the piston rod 4 continuously extends out of the cover body 12, so as to make the brake shoe of the vehicle hold the wheel tightly through the lever in the piston rod 4 to complete the braking operation. Figure 4 As shown, Figure 4 The arrow in the upper middle portion indicates the moving direction of the piston body 3 .

[0059] When the vehicle enters the release phase, the compressed air in the rod cavity is discharged from the brake cylinder. At this time, the piston body 3 returns to the release position under the extension of the release spring 8. The release phase refers to the process of the vehicle re-accelerating after stopping. The release position can be understood as the piston body 3 and the piston diaphragm 6 being at one end of the cylinder body 11 away from the cover body 12. Figure 5 As shown, Figure 5 The arrow in the upper middle portion indicates the moving direction of the piston body 3 .

[0060] In one embodiment of the present invention, Figure 3 As shown, the piston body 3 includes a first connecting portion 31 and a piston portion 32. The piston portion 32 is arranged around the first connecting portion 31. The first connecting portion 31 is connected to the piston rod 4. The piston portion 32 abuts against the circumferential inner wall of the cylinder body 11.

[0061] A clearance opening for the first connection portion 31 to pass through is provided in the middle of the annular support portion 51 , and the annular support portion 51 covers at least a portion of the first connection portion 31 .

[0062] It should be noted that the first connection portion 31 and the piston portion 32 in the piston body 3 can be an integrally formed structure, thereby improving the rigidity of the piston body 3. The first connection portion 31 of the piston body 3 can be connected to the piston rod 4 by bolt fasteners, and the piston portion 32 of the piston body 3 can be abutted against the circumferential inner wall of the cylinder body 11, so that a rod cavity can be formed between the piston portion 32 and the end of the cylinder body 11 away from the cover body 12, and the piston portion 32 can ensure the sealing of the connection with the circumferential inner wall of the cylinder body 11.

[0063] When the guide device 5 is assembled with the piston body 3, the first connection portion 31 of the piston body 3 can be inserted into the avoidance opening of the annular support portion 51, a part of the structure of the annular support portion 51 is tightly arranged with the piston portion 32 of the piston body 3, and another part of the structure of the annular support portion 51 can cover at least a part of the first connection portion 31, thereby increasing the connection area between the annular support portion 51 and the piston body 3, not only the connection stability between the two is improved, but also the rigidity of the end face of the piston body 3 away from the support ring 2 can be further strengthened.

[0064] The first connecting portion 31 may be a truncated cone structure that gradually becomes smaller from one end of the piston body 3 facing the piston diaphragm 6 to the other end away from the piston diaphragm 6 .

[0065] The annular support portion 51 covers at least a portion of the first connection portion 31 , which means that the annular support portion 51 may cover a portion of the circumferential side wall of the first connection portion 31 , or may cover the entire circumferential side wall of the first connection portion 31 .

[0066] In one embodiment of the utility model, the brake cylinder also includes a dust cover 7, and the piston diaphragm 6 and the dust cover 7 are respectively arranged on both sides of the piston rod 4 along its own axial direction; the dust cover 7 includes a cover body and a second connecting part, the cover body is extended along the axial direction of the piston rod 4, and the cover body extends along the axial direction of the piston rod 4 to form the second connecting part, the second connecting part is connected to the cover body 12, and the cover body is sleeved outside the piston rod 4.

[0067] It should be noted that the piston diaphragm 6 can be arranged on the left side of the piston rod 4, and the dust cover 7 can be arranged on the right side of the piston rod 4. The piston diaphragm 6 is connected to the piston body 3, so the left end of the piston rod 4 is connected to the piston body 3, and the right end is passed through the dust cover 7 and the cover body 12, so that the piston body 3 and the dust cover 7 (and the cover body 12) can play an axial guiding role on the piston rod 4 from both sides, thereby further improving the stability of the axial reciprocating motion of the piston rod 4.

[0068] The second connecting portion can be understood as an annular plate structure extending outward from one end of the cover body toward the cover body; the second connecting portion can be connected to the cover body 12 by bolts or rivets to realize fixing the dust cover 7 on the cover body 12. Since the piston rod 4 is passed through the cover body extending along its own axial direction, and the first connecting portion 31 of the cover body is connected to the cover body 12, the dust cover 7 can not only strengthen the sealing of the connection between the cover body 12 and the piston rod 4 to prevent dust from entering through the gap between the two, but also the cover body extending along the axial direction of the piston rod 4 can also provide a certain guiding effect on the axial reciprocating motion of the piston rod 4, further improving the stability of the axial reciprocating motion of the piston rod 4.

[0069] In one embodiment of the present invention, Figures 3 to 5 As shown, the cylinder barrel 1 further includes a dust filter 13, and a breathing port is provided on the cover body 12, and the dust filter 13 is installed at the breathing port.

[0070] It should be noted that the cover 12 is provided with a breathing port connected to the cylinder body 11, and the breathing port is used to balance the difference in air pressure inside and outside the vehicle's brake system. Specifically, the vehicle's brake cylinder will generate heat and steam when working, so that the air pressure inside the cylinder barrel 1 will increase, resulting in the brake being unable to be released normally. Therefore, the breathing port can effectively balance the air pressure inside and outside the brake cylinder of the vehicle's brake system. The dust filter 13 is installed at the breathing port, so the dust and impurities entering the cylinder barrel 1 from the outside air can be effectively filtered out through the dust filter 13 to ensure that relatively clean air enters the cylinder barrel 1.

[0071] In an embodiment of the present invention, the dust filter 13 is sintered from powder metallurgy materials.

[0072] It should be noted that in the related art, Figure 6 As shown, the dust filter net 13 is usually woven into a net with steel wire material. During use, since the mesh density of the dust filter net 13 made of steel wire material is uneven, it cannot prevent fine particles or impurities, which greatly reduces the dust filtering effect. The sand and dust rolled up during the operation of the vehicle invade the dust filter net 13 for a long time under the action of air or wind, resulting in reduced strength and density of the dust filter net 13. A large amount of dust and sand enters the cylinder body 11 through the dust filter net 13, causing leakage, and the grease in the brake cylinder discolors, affecting the safety and life of the brake cylinder.

[0073] Therefore, in this embodiment, see Figure 7 As shown, the dust filter 13 is sintered from powder metallurgy materials so that the mesh density on the dust filter 13 is evenly distributed, and the dust filter 13 made of powder metallurgy materials has the advantages of high filtering accuracy, uniform pore distribution, stable filtering performance, and high mechanical strength, so that it can effectively filter out fine particles or impurities entering the cylinder barrel 1 from the outside, thereby correspondingly extending the service life of the brake cylinder.

[0074] Preferably, the dust filter 13 can be formed by sintering bronze powder metallurgy material.

[0075] Although the utility model is disclosed as above, the protection scope of the utility model is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the utility model, and these changes and modifications will fall within the protection scope of the utility model.

Claims

1. A brake cylinder, It is characterized in that The invention comprises a cylinder barrel (1), a support ring (2), a piston body (3), a piston rod (4) and a guide device (5), wherein the cylinder barrel (1) comprises a cylinder body (11) and a cover body (12), wherein the cover body (12) is arranged to cover the opening of the cylinder body (11); the piston body (3), the guide device (5) and the support ring (2) are installed in the cylinder body (11), one end of the piston rod (4) is connected to the piston body (3), and the other end of the piston rod (4) is passed through the cover body (12); the support ring (2) and the guide device (5) are respectively arranged at two axial ends of the piston rod (4) of the piston body (3), wherein the support ring (2) is connected to the piston body (3), and at least part of the guide device (5) is connected to the end of the piston body (3) away from the support ring (2).

2. The brake cylinder according to claim 1, It is characterized in that The guide device (5) comprises an annular support portion (51), and the annular support portion (51) is arranged in close contact with the end of the piston body (3) away from the support ring (2).

3. The brake cylinder according to claim 2, It is characterized in that The guide device (5) comprises an annular guide portion (52), the annular guide portion (52) is connected to the circumferential edge of the annular support portion (51), and the annular guide portion (52) abuts against the circumferential inner wall of the cylinder body (11).

4. The brake cylinder according to claim 1, It is characterized in that The support ring (2) is coaxially arranged with the piston body (3), and the support ring (2) is clamped with the piston body (3), the piston rod (4) is connected to the end of the piston body (3) away from the support ring (2), and the circumferential edge of the support ring (2) is in contact with the inner wall of the cylinder body (11).

5. The brake cylinder according to claim 4, It is characterized in that It also includes a piston diaphragm (6), which is located between the end of the cylinder body (11) away from the cover body (12) and the piston body (3), and the piston diaphragm (6) is connected to the end of the piston body (3) facing the support ring (2), and the end of the piston diaphragm (6) facing the piston body (3) is in contact with the support ring (2).

6. The brake cylinder according to claim 5, It is characterized in that The piston diaphragm (6) comprises a diaphragm body (61), a first abutment portion (62) and a second abutment portion (63); the diaphragm body (61) is a disc structure; the diaphragm body (61) is tightly arranged with the piston body (3); the diaphragm body (61) is bent toward the circumferential side wall of the cylinder body (11) to form the first abutment portion (62); the first abutment portion (62) abuts against the end of the support ring (2) away from the piston rod (4); the first abutment portion (62) is bent toward one end of the cylinder body (11) away from the cover body (12) to form the second abutment portion (63); the second abutment portion (63) abuts against the circumferential inner wall of the cylinder body (11).

7. The brake cylinder according to claim 2, It is characterized in that The piston body (3) comprises a first connecting portion (31) and a piston portion (32), wherein the piston portion (32) is arranged around the first connecting portion (31), the first connecting portion (31) is connected to the piston rod (4), and the piston portion (32) abuts against the circumferential inner wall of the cylinder body (11); A middle portion of the annular support portion (51) is provided with an escape opening for the first connection portion (31) to pass through, and the annular support portion (51) covers at least a portion of the first connection portion (31).

8. The brake cylinder according to claim 5, It is characterized in that It also includes a dust cover (7), and the piston diaphragm (6) and the dust cover (7) are respectively arranged on both sides of the piston rod (4) along its own axial direction; the dust cover (7) includes a cover body and a second connecting part, the cover body is extended along the axial direction of the piston rod (4), and the cover body is extended along the axial direction of the piston rod (4) to form the second connecting part, the second connecting part is connected to the cover body (12), and the cover body is sleeved outside the piston rod (4).

9. The brake cylinder according to any one of claims 1 to 8, It is characterized in that The cylinder barrel (1) further comprises a dust filter (13); a breathing port is provided on the cover body (12); and the dust filter (13) is installed at the breathing port.

10. The brake cylinder according to claim 9, It is characterized in that The dust filter (13) is made by sintering powder metallurgy materials.

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