Piston assembly, brake chamber and vehicle

Abstract

The utility model relates to the field of brake systems of vehicles, in particular to a piston assembly, a brake chamber and a vehicle. Wherein the piston assembly comprises a piston, a guide sleeve and a Y-shaped ring which are manufactured by adopting a stamping process; the guide sleeve and the Y-shaped ring are respectively sleeved on the piston, the Y-shaped ring is in positioning connection with the piston through the guide sleeve along the axial direction of the piston, and the Y-shaped ring is in clamping connection with the guide sleeve. The Y-shaped ring and the guide sleeve are connected in the clamping mode, the Y-shaped ring and the piston are connected in the positioning mode through the guide sleeve, when the piston assembly is arranged in the cylinder body of the brake chamber, the Y-shaped ring is limited by the gap between the guide sleeve and the cylinder body, so that the Y-shaped ring and the guide sleeve cannot fall off from each other, and under the condition that the guide sleeve and the piston cannot fall off from each other, the Y-shaped ring and the piston can not fall off from each other. The effect that the Y-shaped ring and the piston cannot fall off from each other is achieved; therefore, according to the piston assembly provided by the embodiment, the technical problem of how to prevent the Y-shaped ring and the piston from mutually falling off on the basis of the piston manufactured by adopting a stamping process is solved.

Description

Technical Field

[0001] The utility model relates to the field of vehicle braking systems, in particular to a piston assembly, a braking air chamber and a vehicle. Background Art

[0002] In the prior art, there is provided a patent document entitled Piston spring brake air chamber with exhaust groove Y-ring, application number 201721597795.4; the patent document specifically adopts the method of clamping the Y-ring on the piston to prevent the Y-ring and the piston from falling off during the reciprocating motion of the piston relative to the cylinder body 4.

[0003] In the above-mentioned prior art, a protrusion needs to be provided on the piston, such as a convex ring or a boss, so that the Y-ring can be engaged with the piston, wherein the protrusion on the piston is inserted into the clamping groove of the Y-ring along the radial direction of the piston, and when the piston moves along its axial direction, the convex protrusion is used to contact and push the Y-ring to move, and since the Y-ring is restricted between the cylinder body and the piston, the Y-ring cannot be separated from the protrusion from the gap between the cylinder body and the piston;

[0004] In the process of modifying the above-mentioned prior art, the inventor of this case found that it is very difficult to set a protrusion on the piston manufactured by stamping process when the piston is modified into a piston manufactured by stamping process; on the one hand, for a piston manufactured by stamping of thin-walled metal material (for example, a thin-walled metal cylinder), a protrusion needs to be processed on its outer surface by a lathe, and the lathe cuts off two adjacent parts of the metal on the surface of the piston, so that a protrusion is naturally formed between two adjacent cut positions; however, if in order to meet the radial height requirements of the protrusion and avoid the axial detachment of the Y-ring and the protrusion along the piston manufactured by stamping of thin-walled metal material, then the cutting amount of the piston is increased, resulting in a significant reduction in the thickness of the thin-walled metal material at the cut position, which will inevitably lead to a reduction in the strength of the piston manufactured by stamping of thin-walled metal material; if in order to meet the strength requirements of the piston manufactured by stamping of thin-walled metal material, then the cutting amount of the piston is reduced, resulting in the radial size of the protrusion failing to meet the requirements, thereby causing the Y-ring and the piston to fall off from each other.

[0005] Therefore, on the basis of the piston made by the stamping process, how to prevent the Y-ring and the piston from falling off from each other becomes a technical problem to be solved. Utility Model Content

[0006] In order to solve the technical problem of how to prevent a Y-shaped ring and a piston from falling off from each other on the basis of a piston manufactured by a stamping process, the utility model provides a piston assembly, a brake air chamber and a vehicle.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0008] According to one aspect of the utility model, there is provided a piston assembly, comprising a piston, a guide sleeve and a Y-ring made by a stamping process;

[0009] The guide sleeve and the Y-shaped ring are respectively sleeved on the piston, and along the axial direction of the piston, the Y-shaped ring forms a positioning connection with the piston through the guide sleeve, wherein the Y-shaped ring and the guide sleeve are snap-fitted and connected.

[0010] Furthermore, the guide sleeve is provided with a first convex ring, a second convex ring and a mounting ring, the first convex ring and the second convex ring are respectively surrounded on the mounting ring, and a spacing is left between the first convex ring and the second convex ring along the axial direction of the piston;

[0011] The diameter of the first convex ring is greater than the diameter of the second convex ring, and the diameter of the second convex ring is greater than the diameter of the mounting ring;

[0012] The Y-shaped ring has an inner surface facing the guide sleeve and an outer surface facing away from the guide sleeve, wherein the Y-shaped ring is provided with a clamping groove, which is annularly recessed in the inner surface and is located between the two ends of the Y-shaped ring;

[0013] The second convex ring is engaged in the clamping groove.

[0014] Further, a receiving groove is formed between the first convex ring, the second convex ring and the mounting ring;

[0015] A portion of the Y-shaped ring is arranged in the receiving groove.

[0016] Furthermore, a positioning groove is processed on the piston, and the positioning groove is recessed in the outer circumferential surface of the piston in a surrounding shape;

[0017] The mounting ring is arranged in the positioning groove, and the mounting ring is in close contact with the groove bottom of the positioning groove.

[0018] Further, the thermal expansion coefficient of the guide sleeve is smaller than the thermal expansion coefficient of the piston.

[0019] According to one aspect of the utility model, a brake air chamber is provided, comprising the piston assembly as described above.

[0020] According to one aspect of the utility model, a vehicle is provided, comprising the brake air chamber as described above.

[0021] The above technical solution has the following advantages or beneficial effects:

[0022] The piston assembly provided by the present utility model, by engaging and connecting the Y-ring and the guide sleeve, and positioning the Y-ring to the piston through the guide sleeve, when the piston assembly is disposed in the cylinder body of the brake chamber, the Y-ring is restricted by the gap between the guide sleeve and the cylinder body, so that the Y-ring and the guide sleeve cannot fall off from each other, and in the case where the guide sleeve and the piston cannot fall off from each other, the effect that the Y-ring and the piston cannot fall off from each other is formed; therefore, the piston assembly provided by this embodiment solves the technical problem of how to avoid the mutual detachment of the Y-ring and the piston on the basis of a piston made by a stamping process. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a cross-sectional view of the piston assembly provided by an embodiment of the present utility model;

[0024] Figure 2 is a cross-sectional view of the guide sleeve provided by an embodiment of the present utility model;

[0025] Figure 3 is a cross-sectional view of the guide sleeve provided by an embodiment of the present utility model;

[0026] Figure 4 is a cross-sectional view of the Y-ring provided by an embodiment of the present utility model;

[0027] Figure 5 is a cross-sectional view of the Y-ring provided by an embodiment of the present utility model;

[0028] Figure 6 is a cross-sectional view of the piston provided by an embodiment of the present utility model;

[0029] Figure 7 is a cross-sectional view of the piston provided by an embodiment of the present utility model;

[0030] Figure 8 is a cross-sectional view of the brake chamber provided by an embodiment of the present utility model;

[0031] Figure 9 is a cross-sectional view of the brake chamber provided by an embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] Embodiment 1:

[0033] In this embodiment, a piston assembly is provided to solve the technical problem of how to avoid the mutual detachment of the Y-ring and the piston on the basis of a piston made by a stamping process.

[0034] Specifically, referring to Figure 1 , the piston assembly of this embodiment includes a piston 1 made by a stamping process, a guide sleeve 2, and a Y-ring 3;

[0035] The guide sleeve 2 and the Y-ring 3 are respectively sleeved on the piston 1. Along the axial direction of the piston 1, the Y-ring 3 forms a positioning connection with the piston 1 through the guide sleeve 2, wherein the Y-ring 3 and the guide sleeve 2 are snap-connected.

[0036] In this embodiment, the piston 1 made by stamping process uses thin-walled metal material as its raw material;

[0037] The guide sleeve 2 is respectively sleeved on the piston 1. The inner ring surface of the guide sleeve 2 contacts the circumferential outer surface of the piston 1 and forms a positioning connection. The positioning connection enables the guide sleeve 2 and the piston 1 to be positioned along the axial direction of the piston 1, avoiding the negative phenomenon of the change in position between the guide sleeve 2 and the piston 1;

[0038] The Y-ring 3 is sleeved on the piston 1, and a part of the Y-ring 3 is sleeved on the guide sleeve 2; specifically, the Y-ring 3 has a lip and a mounting part. The axial cross-section of the Y-ring 3 is in the shape of the letter Y, and the shape of the letter Y can be regarded as a combination of a V-shaped part and an I-shaped part. The lip is the V-shaped part of the letter Y, and the mounting part is the I-shaped part of the letter Y; the lip of the Y-ring 3 contacts the circumferential outer surface of the piston 1, while the mounting part contacts the guide sleeve 2; in other words, the lip of the Y-ring 3 is in direct contact with the piston 1 in the radial direction, and the mounting part of the Y-ring 3 is separated from the piston 1 by the guide sleeve 2 in the radial direction;

[0039] See Figure 8 or Figure 9 , when the piston assembly is arranged in the cylinder block 4 of the brake chamber, along the radial direction of the piston 1, the lip of the Y-ring 3 contacts the inner wall of the cylinder block 4, so that the gap between the piston 1 and the cylinder block 4 is sealed by the Y-ring 3; during the reciprocating movement of the piston assembly relative to the cylinder block 4, the Y-ring 3 forms a sliding friction with the cylinder block 4. The frictional force formed by the Y-ring 3 and the cylinder block 4 forces the Y-ring 3 to have a tendency to move away from the piston 1. However, since the Y-ring 3 and the guide sleeve 2 are snap-connected, and the guide sleeve 2 and the piston 1 form a positioning connection, thus, the guide sleeve 2 and the piston 1 cannot fall off, and the Y-ring 3 and the guide sleeve 2 cannot fall off, and further the Y-ring 3 cannot perform the movement action of moving away from the piston 1. The Y-ring 3 can only move together with the piston 1 and the guide sleeve 2 in the same direction;

[0040] In other words, when the Y-ring 3 is forced to have a tendency to move away from the piston 1, since the 'frictional force or resistance between the guide sleeve 2 and the piston 1' is greater than the 'frictional force between the Y-ring 3 and the cylinder block 4', and since the 'frictional force or resistance between the guide sleeve 2 and the Y-ring 3' is greater than the 'frictional force between the Y-ring 3 and the cylinder block 4', thus the Y-ring 3 cannot perform the movement action of moving away from the piston 1. The Y-ring 3 can only move together with the piston 1 and the guide sleeve 2 in the same direction.

[0041] It should be understood that the gap between the installation part of the Y-ring 3 and the cylinder block 4 is very small, and the gap between the guide sleeve 2 and the cylinder block 4 is very small, which is common general knowledge known to those skilled in the art;

[0042] It should be understood that in the structure where the Y-ring 3 and the guide sleeve 2 respectively form very small gaps with the cylinder block 4 and the Y-ring 3 and the guide sleeve 2 form a partially overlapping structure, the installation part of the Y-ring 3 cannot be separated from the guide sleeve 2 through its own deformation. Specifically, at the engagement connection between the Y-ring 3 and the guide sleeve 2, the deformation amount of the installation part of the Y-ring 3 is restricted by the gap between the guide sleeve 2 and the cylinder block 4. Thus, after the deformation of the installation part of the Y-ring 3, the thickness of its installation part is still greater than the gap between the guide sleeve 2 and the cylinder block 4, so the Y-ring 3 cannot be separated from the guide sleeve 2.

[0043] In this embodiment, the guide sleeve 2 and the Y-ring 3 are engaged and connected, which should be regarded as the protruding part of the guide sleeve 2 being inserted into the contour of the Y-ring 3; the specific engagement connection structure between the guide sleeve 2 and the Y-ring 3 will be presented later and will not be mentioned for the time being.

[0044] Comparative Example 1: A first comparative piston made of a thin-walled metal material as the raw material and manufactured by a stamping process. After stamping, a protruding part is machined on the outer circumferential surface of the first comparative piston by a lathe. When the radial height requirement of the protruding part is met, the thickness of the thin-walled metal material on both sides of the protruding part after being cut is significantly reduced, thereby reducing the strength of the first comparative piston.

[0045] The piston assembly of this embodiment changes the position of the protruding part compared with Comparative Example 1; specifically, in Comparative Example 1, the protruding part is located on the piston, while in this embodiment, the protruding part is located on the guide sleeve 2, thus avoiding the situation in Comparative Example 1 where the thickness of the thin-walled metal material after being cut is significantly reduced, resulting in a reduction in the strength of the piston.

[0046] Comparative Example 2: A second comparative piston made of a thin-walled metal material as the raw material and manufactured by a stamping process. After stamping, a protruding part is machined on the circumferential surface of the second comparative piston by a lathe, but the radial height of the protruding part does not meet the requirement, and the thickness of the thin-walled metal material on both sides of the protruding part after being cut is still relatively thick. Thus, the strength of the second comparative piston is relatively high, but the radial dimension of the protruding part on the second comparative piston is relatively small.

[0047] The piston assembly of this embodiment has changed the position of the protrusion compared to Comparative Example 2. Specifically, in Comparative Example 2, the protrusion is located on the piston, while in this embodiment, the protrusion is located on the guide sleeve 2, thus avoiding the situation in Comparative Example 2 where the piston has relatively high strength but the radial dimension of the protrusion on the piston is relatively small, and further avoiding the situation where the Y-ring and the piston fall off each other.

[0048] The piston assembly provided in this embodiment, by engaging and connecting the Y-ring 3 and the guide sleeve 2, and the Y-ring 3 forms a positioning connection with the piston 1 through the guide sleeve 2. When the piston assembly is arranged in the cylinder block 4 of the brake air chamber, the Y-ring 3 is restricted by the gap between the guide sleeve 2 and the cylinder block 4, so that the Y-ring 3 and the guide sleeve 2 cannot fall off each other, and in the case where the guide sleeve 2 and the piston 1 cannot fall off each other, the effect that the Y-ring 3 and the piston 1 cannot fall off each other is formed. Therefore, the piston assembly provided in this embodiment solves the technical problem of how to avoid the Y-ring and the piston from falling off each other on the basis of a piston made by a stamping process.

[0049] Further, in the foregoing solution, how the Y-ring 3 and the guide sleeve 2 form an engaging connection is preferably achieved by the following solution.

[0050] See Figures 2 to 4 , in the piston assembly of this embodiment, the guide sleeve 2 is provided with a first convex ring 201, a second convex ring 202 and a mounting ring 203. The first convex ring 201 and the second convex ring 202 respectively surround the mounting ring 203, and along the axial direction of the piston 1, there is a gap between the first convex ring 201 and the second convex ring 202;

[0051] The diameter of the first convex ring 201 is larger than the diameter of the second convex ring 202, and the diameter of the second convex ring 202 is larger than the diameter of the mounting ring 203;

[0052] The Y-ring 3 has an inner surface facing the guide sleeve 2 and an outer surface facing away from the guide sleeve 2. Among them, the Y-ring 3 is provided with a card slot 301, and the card slot 301 is recessed in the inner surface in a circular ring shape, and the card slot 301 is located between the two ends of the Y-ring 3;

[0053] The second convex ring 202 is engaged in the card slot 301.

[0054] Among them, the structure of the guide sleeve 2 can adopt the following various structures:

[0055] The axial cross-section of the mounting ring 203 is rectangular or trapezoidal (a trapezoid with a narrower upper part and a wider lower part), etc. The mounting ring 203 has an outer circumferential surface and an inner circumferential surface. A first convex ring 201 and a second convex ring 202 are provided on the outer circumferential surface. Among them, the first convex ring 201 and the second convex ring 202 are respectively circular rings, and the first convex ring 201 and the second convex ring 202 are respectively coaxial with the mounting ring 203. The position of the first convex ring 201 can be set at one end of the mounting ring 203, or the position of the first convex ring 201 can be set between the two ends of the mounting ring 203. Similarly, the position of the second convex ring 202 can be set at the other end of the mounting ring 203, or the position of the second convex ring 202 can be set between the two ends of the mounting ring 203. In addition, there is a gap between the first convex ring 201 and the second convex ring 202.

[0056] The specific structure of the Y-ring 3 is prior art. Please refer to the Y-ring in 'Piston-type spring brake air chamber with exhaust groove Y-ring, application number 201721597795.4', and it will not be elaborated here.

[0057] When the Y-ring 3 is connected to the guide sleeve 2, the operator makes the diameter of the Y-ring 3 larger by expanding the Y-ring 3 along the radial direction, and then the Y-ring 3 can be sleeved and passed over the second convex ring 202 on the guide sleeve 2. At this time, the second convex ring 202 is engaged in the card slot 301.

[0058] See Figure 2 、 Figure 3 or Figure 9 ,, From the perspective of the guide sleeve 2, a receiving groove is formed between the first convex ring 201, the second convex ring 202 and the mounting ring 203.

[0059] A part of the Y-ring 3 is arranged in the receiving groove.

[0060] A part of the Y-ring 3 is received between the first convex ring 201 and the second convex ring 202. The two axial end faces of the second convex ring 202 respectively contact the two axial slot walls of the card slot 301 of the Y-ring 3, and the circumferential surface of the second convex ring 202 contacts the bottom of the card slot 301 of the Y-ring 3.

[0061] It should be understood that in addition to the foregoing connection scheme of the Y-ring 3 and the guide sleeve 2, other connection structures can also be adopted. For example, a positioning blind hole is provided on the Y-ring 3 to replace the foregoing card slot 301 of the Y-ring 3. Correspondingly, a protrusion is provided on the guide sleeve 2 to replace the foregoing second convex ring 202, and the protrusion of the guide sleeve 2 can be snapped into the positioning blind hole of the Y-ring 3.

[0062] Furthermore, in the foregoing scheme, how to achieve the positioning connection between the guide ring and the piston 1 is preferably achieved by the following scheme.

[0063] See Figure 6 、 Figure 7 or Figure 9 , for the piston assembly of this embodiment, a positioning groove 101 is machined on the piston 1, and the positioning groove 101 is a circumferentially concave groove on the outer circumferential surface of the piston 1;

[0064] The mounting ring 203 is arranged in the positioning groove 101, and the mounting ring 203 is in close contact with the bottom of the positioning groove 101.

[0065] Among them, after using a thin-walled metal material as the raw material and manufacturing the piston 1 through a stamping process, the staff processes the piston 1 through a lathe to form the positioning groove 101 on the piston 1;

[0066] It should be understood that in this embodiment, the specific structure of the positioning groove 101 should be understood as a circular ring-shaped groove structure that is concave on the outer circumferential surface of the piston 1. This structure enables the guide sleeve 2 to be directly sleeved on the piston 1, with a simple structure, reliable use, and high assembly efficiency.

[0067] It should be understood that in this embodiment, the groove depth of the positioning groove 101 is relatively shallow. From the perspective of the amount of cut metal, the amount of metal of the piston 1 removed by the lathe is relatively small, so that the positioning groove 101 appears as a shallow groove when observed by the human eye. This setting method does not affect the strength of the piston 1 and can ensure that when the guide sleeve 2 is sleeved on the positioning groove 101, the guide sleeve 2 and the positioning groove 101 cannot fall off axially.

[0068] Since the positioning groove 101 is concave on the outer circumferential surface of the piston 1, the diameter of the bottom of the positioning groove 101 is smaller than the diameter of the outer circumferential surface of the rest of the piston 1 except for the positioning groove 101. From the perspective of assembling the guide sleeve 2 and the piston 1, the guide sleeve 2 (more specifically, the mounting ring 203) needs to be first sleeved on the outer circumferential surface of the piston 1 with a larger diameter, and then can be sleeved on the bottom of the positioning groove 101 with a smaller diameter. Therefore, in order to realize the connection between the positioning groove 101 and the guide sleeve 2, the following two methods are needed for assembly:

[0069] Method 1: Heat the guide sleeve 2, and after the guide sleeve 2 (more specifically, the mounting ring 203) expands due to heat, it can be sleeved on the piston 1 at room temperature; by using the increased inner diameter of the heated guide sleeve 2, the guide sleeve 2 can be sleeved on the outer circumferential surface of the piston 1 and moved to the positioning groove 101. At this time, there is a gap between the inner surface of the guide sleeve 2 at a relatively high temperature and the bottom of the positioning groove 101. When the temperature of the guide sleeve 2 drops to room temperature, the size of the guide sleeve 2 shrinks, so that the inner surface of the guide sleeve 2 is in close contact with the bottom of the positioning groove 101.

[0070] Method 2: After freezing the piston 1 and the piston 1 shrinks due to pre-cooling, the normal-temperature guide sleeve 2 can be sleeved on the low-temperature piston 1; by using the outer diameter clearance of the piston 1 after freezing, the normal-temperature guide sleeve 2 can be sleeved on the circumferential outer surface of the piston 1 and moved to the positioning groove 101. At this time, there is a clearance between the inner surface of the normal-temperature guide sleeve 2 and the bottom of the positioning groove 101 of the low-temperature piston 1. After the temperature of the piston 1 rises to room temperature, the size of the piston 1 expands, so that the inner surface of the guide sleeve 2 tightly contacts the bottom of the positioning groove 101.

[0071] Furthermore, during the actual installation of the aforementioned piston assembly in the cylinder block 4 of the brake chamber and the reciprocating movement of the piston assembly relative to the cylinder block 4, it is inevitable that the temperature of the piston assembly rises, which may cause the guide sleeve 2 and the piston 1 to fall off each other.

[0072] In order to avoid the above situation, in this embodiment, the coefficient of thermal expansion of the guide sleeve 2 is smaller than that of the piston 1.

[0073] During the process of simultaneous heating of the guide sleeve 2 and the piston 1, both expand respectively. Since the coefficient of thermal expansion of the guide sleeve 2 is relatively small, the diameter change of the guide sleeve 2 after expansion is relatively small. Correspondingly, since the coefficient of thermal expansion of the piston 1 is relatively high, the diameter change of the piston 1 after expansion is relatively large; overall, both expand simultaneously, and the outer diameter of the expanded piston 1 has a tendency to be larger than the inner diameter of the guide sleeve 2, so that there is no gap between the guide sleeve 2 and the piston 1 during heating, and the guide sleeve 2 still tightly contacts the bottom of the positioning groove 101 of the piston 1. Therefore, the situation where the guide sleeve 2 and the piston 1 fall off each other will not occur.

[0074] It should be understood that in this embodiment, the specific material of the guide sleeve 2 is not limited, and the coefficient of thermal expansion of the guide sleeve 2 being smaller than that of the piston 1 is one of the necessary conditions for selecting the material of the guide sleeve 2.

[0075] Embodiment 2:

[0076] In this embodiment, refer to Figure 8 or Figure 9 , a brake chamber is provided, including the piston assembly in the aforementioned Embodiment 1.

[0077] In this embodiment, the structure of the brake chamber can refer to the structure of the brake chamber in the prior art. For example, for the brake chamber in the prior art with the name of piston type spring brake chamber with exhaust groove and Y-ring, and the application number 201721597795.4, the piston, guide sleeve and Y-ring therein can be replaced with the piston assembly in the aforementioned Embodiment 1.

[0078] The brake chamber of this embodiment, the function of the piston assembly therein is the same as that of the piston assembly of the brake chamber in the prior art, which will not be elaborated here.

[0079] Embodiment 3:

[0080] In this embodiment, a vehicle is provided, including the brake chamber in the aforementioned Embodiment 2.

[0081] For the vehicle of this embodiment, the function of the brake chamber therein is the same as that of the brake chamber of the vehicle in the prior art, which will not be elaborated here.

[0082] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be included in the patent protection scope of the present invention by the same token.

Claims

1. A piston assembly, characterized in that: It includes a piston, a guide sleeve and a Y-ring made by stamping process; The guide sleeve and the Y-shaped ring are respectively sleeved on the piston, and along the axial direction of the piston, the Y-shaped ring forms a positioning connection with the piston through the guide sleeve, wherein the Y-shaped ring and the guide sleeve are snap-fitted and connected.

2. The piston assembly according to claim 1, characterized in that The guide sleeve is provided with a first convex ring, a second convex ring and a mounting ring, the first convex ring and the second convex ring are respectively surrounded on the mounting ring, and a distance is left between the first convex ring and the second convex ring along the axial direction of the piston; The diameter of the first convex ring is greater than the diameter of the second convex ring, and the diameter of the second convex ring is greater than the diameter of the mounting ring; The Y-shaped ring has an inner surface facing the guide sleeve and an outer surface away from the guide sleeve, wherein the Y-shaped ring is provided with a clamping groove, the clamping groove is annularly recessed in the inner surface, and the clamping groove is located between the two ends of the Y-shaped ring; The second convex ring is engaged in the clamping groove.

3. The piston assembly according to claim 2, characterized in that A receiving groove is formed between the first convex ring, the second convex ring and the mounting ring; A portion of the Y-shaped ring is disposed in the receiving groove.

4. The piston assembly according to claim 2, characterized in that: The piston is processed with a positioning groove, and the positioning groove is recessed in the outer circumferential surface of the piston in a surrounding shape; The mounting ring is arranged in the positioning groove, and the mounting ring is in close contact with the groove bottom of the positioning groove.

5. The piston assembly according to claim 4, characterized in that The thermal expansion coefficient of the guide sleeve is smaller than the thermal expansion coefficient of the piston.

6. Brake chamber, characterized in that: Comprising a piston assembly as claimed in any one of claims 1 to 5.

7. A vehicle, characterized in that Comprising the brake air chamber as claimed in claim 6.

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