Assembly tool and assembly equipment for piston assembly

Abstract

The invention relates to an assembly tool and assembly equipment for a piston assembly. The assembly tool for the piston assembly comprises a base, a barrel and a limiting sleeve. The cylinder body is installed on the base, an installation cavity is formed in the cylinder body, an opening used for pressing a piston is formed in the upper end of the installation cavity, the limiting sleeve is used for being arranged on the outer side of a lead screw and a threaded sleeve in a sleeving mode, and the limiting sleeve is installed at the position, close to the opening, of the installation cavity and can slide relative to the installation cavity in the vertical direction. According to the assembly tool for the piston assembly, radial position deviation existing during press fitting of the threaded sleeve and the piston can be reduced, and the problem that the piston assembly is unstable in the press fitting process is solved.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to an assembly tool and an assembly device for a piston assembly. Background Art

[0002] The braking performance of a car directly affects the driving safety of the car. With the continuous improvement of vehicle performance and the continuous increase in vehicle speed, people have higher and higher requirements for safety and reliability. As an important component of the automobile braking system, the assembly quality of the caliper needs to be strictly controlled.

[0003] In the related art, the piston assembly of the caliper includes a lead screw, a threaded sleeve and a piston, wherein the threaded sleeve sliding sleeve is arranged on the lead screw, and the threaded sleeve and the piston are press-fitted together so that the lead screw can drive the piston to reciprocate through the threaded sleeve. However, when the threaded sleeve and the piston are assembled, due to the radial clearance between the threaded sleeve and the lead screw, radial shaking will be generated during the press-fitting process of the threaded sleeve and the lead screw, resulting in radial position deviation when the threaded sleeve and the piston are press-fitted, and the press-fitting process is unstable. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an embodiment of the present invention provides an assembly tool for a piston assembly, which can reduce the radial position deviation between the threaded sleeve and the piston during press-fitting, and avoid the instability problem during the press-fitting process of the piston assembly.

[0006] An embodiment of the present invention further provides an assembly device.

[0007] The assembly tooling of the piston assembly of an embodiment of the present invention includes: a base; a cylinder, which is installed on the base, and a mounting cavity is provided in the cylinder, and the upper end of the mounting cavity has an opening for press-fitting the piston; a limit sleeve, which is used to be sleeved on the outside of the lead screw and the threaded sleeve, and the limit sleeve is installed in the mounting cavity at a position adjacent to the opening and can slide relative to the mounting cavity in the up and down directions.

[0008] According to the assembly tool of the piston assembly of the embodiment of the present invention, since the limiting sleeve is arranged on the outside of the lead screw and the screw sleeve, the coaxiality of the lead screw and the screw sleeve can be ensured to avoid the problem of radial misalignment of the lead screw and the screw sleeve, and the limiting sleeve can slide relative to the installation cavity in the up and down directions, so that the limiting sleeve can be pressed down together with the lead screw and the screw sleeve, so that the screw sleeve can be aligned and pressed into the piston, thereby completing the assembly of the piston assembly. Therefore, the assembly tool of the piston assembly of the embodiment of the present invention can reduce the radial position deviation existing when the screw sleeve and the piston are pressed, and avoid the problem of instability during the press-fitting process of the piston assembly.

[0009] In some embodiments, the limiting sleeve includes a top plate and a limiting body, the top plate is sealed on the upper end of the limiting body, the lower end surface of the top plate is suitable for abutting against the upper end surface of the lead screw, and the limiting body is sleeved on the outside of the lead screw and the screw sleeve.

[0010] In some embodiments, a gap value between an outer circumferential wall of the limiting sleeve and an inner circumferential wall of the installation cavity is greater than 0 and less than or equal to 0.3 mm.

[0011] In some embodiments, the inner wall of the limiting sleeve is provided with a step portion, the step portion is arranged around the circumference of the limiting sleeve, and the step portion is suitable for matching with the step groove at the upper end of the lead screw.

[0012] In some embodiments, the limit sleeve has a first position before press-fitting and a second position after press-fitting, and the limit sleeve can be moved downward from the first position to the second position under the action of external force; in the second position, the upper end of the limit sleeve protrudes from the installation cavity, and the lower end of the limit sleeve is suitable for being spaced apart from the piston.

[0013] In some embodiments, the cylinder has a supporting portion, which is disposed at the lower end of the mounting cavity for supporting the piston, and the supporting portion has a through hole, which is communicated with the mounting cavity.

[0014] In some embodiments, the support portion has a first annular surface and a second annular surface, the second annular surface is arranged above the first annular surface, and in a projection plane orthogonal to the axial direction of the mounting cavity, the first annular surface is located within the second annular surface, and at least one of the first annular surface and the second annular surface supports the piston.

[0015] In some embodiments, there are a plurality of the cylinders and the limiting sleeves, the plurality of cylinders are arranged on the base at intervals, and the plurality of limiting sleeves correspond one-to-one to the plurality of bases.

[0016] In some embodiments, the cylinder is connected to the base via a screw; or, the cylinder is directly placed on the base; or, the cylinder and the base are integrally formed.

[0017] An assembly device according to another embodiment of the present invention comprises: an assembly tool for a piston assembly, wherein the assembly tool for the piston assembly is the assembly tool for the piston assembly described in any one of the embodiments of the present invention; and a stamping device, wherein the stamping device is disposed above the limit sleeve and is movable in the up and down directions to stamp the limit sleeve.

[0018] According to the assembly equipment of the embodiment of the present invention, since the limiting sleeve is arranged on the outside of the lead screw and the screw sleeve, the coaxiality of the lead screw and the screw sleeve can be ensured to avoid the problem of radial misalignment of the lead screw and the screw sleeve, and the limiting sleeve can slide relative to the installation cavity in the up and down directions, so that the limiting sleeve can be pressed down together with the lead screw and the screw sleeve, so that the screw sleeve can be aligned and pressed into the piston, thereby completing the assembly of the piston assembly. Therefore, the assembly equipment of the embodiment of the present invention can reduce the radial position deviation existing when the screw sleeve and the piston are pressed, and avoid the problem of instability during the press-fitting process of the piston assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an exploded view of an assembly tool of a piston assembly and a piston assembly according to an embodiment of the present invention.

[0020] Figure 2 It is an installation top view of an assembly tool of a piston assembly and an installation top view of the piston assembly according to an embodiment of the present invention.

[0021] Figure 3 yes Figure 2 Cross-sectional view of AA.

[0022] Figure 4 It is a cross-sectional view of a limiting sleeve of an assembly tool of a piston assembly according to an embodiment of the present invention along the AA section line.

[0023] Figure 5 It is a cross-sectional view of the cylinder of the assembly tool of the piston assembly according to the embodiment of the present invention along the AA section line.

[0024] Reference numerals:

[0025] 1. Base;

[0026] 2. Cylinder; 21. Mounting cavity; 22. Support portion; 221. First annular surface; 222. Second annular surface; 23. Through hole;

[0027] 3. Limit sleeve; 31. Top plate; 32. Limit body; 33. Step portion;

[0028] 4. Piston assembly; 41. Piston; 42. Lead screw; 421. Step groove; 43. Screw sleeve. DETAILED DESCRIPTION

[0029] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0030] Please refer to the following Figures 1 to 5 An assembly tool and an assembly device for a piston assembly according to an embodiment of the present invention are described.

[0031] like Figures 1 to 5 As shown, the assembly tool of the piston assembly according to the embodiment of the present invention comprises: a base 1, a cylinder 2 and a limiting sleeve 3. The cylinder 2 is mounted on the base 1, and a mounting cavity 21 is provided in the cylinder 2. The upper end of the mounting cavity 21 has an opening for press-fitting the piston 41. The limiting sleeve 3 is used to be sleeved on the outer side of the lead screw 42 and the screw sleeve 43. The limiting sleeve 3 is mounted at a position adjacent to the opening of the mounting cavity 21 and can slide relative to the mounting cavity 21 in the up-down direction.

[0032] According to the assembly tool of the piston assembly of the embodiment of the present invention, since the limit sleeve 3 is sleeved on the outside of the lead screw 42 and the screw sleeve 43, the coaxiality of the lead screw 42 and the screw sleeve 43 can be ensured to avoid the problem of radial misalignment of the lead screw 42 and the screw sleeve 43, and the limit sleeve 3 can slide relative to the installation cavity 21 in the up and down directions, so that the limit sleeve 3 can be pressed down together with the lead screw 42 and the screw sleeve 43, so that the screw sleeve 43 can be aligned and pressed into the piston 41, thereby completing the assembly of the piston assembly 4. Therefore, the assembly tool of the piston assembly of the embodiment of the present invention can reduce the radial position deviation existing when the screw sleeve 43 and the piston 41 are pressed, and avoid the problem of instability during the press-fitting process of the piston assembly 4. In this way, the resistance and noise during the movement of the piston assembly 4 can be reduced, and the product competitiveness of the piston assembly 4 can be improved.

[0033] It should be noted that if Figure 3 As shown, the screw sleeve 43 is a ball screw sleeve, so there is a certain installation gap between the screw sleeve 43 and the lead screw 42, which causes the screw sleeve 43 and the lead screw 42 to shake radially. When the lead screw 42 is pressed to press the screw sleeve 43 onto the piston 41, since the screw sleeve 43 and the lead screw 42 are not on the same axis, the screw sleeve 43 is prone to radial misalignment with the matching opening of the piston 41. Therefore, it is necessary to sleeve a limit sleeve 3 on the outside of the screw sleeve 43 and the lead screw 42 to ensure the coaxiality of the screw sleeve 43 and the lead screw 42, so that the screw sleeve 43 and the piston 41 can be on the same axis, and the relative movement of the screw sleeve 43 and the lead screw 42 itself can be prevented. The problem of instability during the press-fitting process of the screw sleeve 43 and the piston 41 is prevented.

[0034] Alternatively, if Figure 3As shown, the limiting sleeve 3 includes a top plate 31 and a limiting body 32, the top plate 31 is sealed on the upper end of the limiting body 32, the lower end surface of the top plate 31 is suitable for abutting against the upper end surface of the lead screw 42, and the limiting body 32 is sleeved on the outer side of the lead screw 42 and the screw sleeve 43. It can be understood that the limiting sleeve 3 is a cylindrical structure with an open lower end and a closed upper end. Since the lower end surface of the top plate 31 abuts against the upper end surface of the lead screw 42, pressure can be applied to the limiting sleeve 3 through a stamping device, and the limiting sleeve 3 can drive the lead screw 42 and the screw sleeve 43 to move downward, so that the screw sleeve 43 is embedded in the matching port of the piston 41. It should be noted that the upper end surface of the top plate 31 is flush with the upper end surface of the lead screw 42, so that the uniformity of the force on the limiting sleeve 3 and the lead screw 42 can be ensured.

[0035] Optionally, a clearance value between an outer circumferential wall of the limiting sleeve 3 and an inner circumferential wall of the mounting cavity 21 is greater than 0 and less than or equal to 0.3 mm.

[0036] For example, the clearance between the outer circumferential wall of the limiting sleeve 3 and the inner circumferential wall of the installation cavity 21 is 0.1 mm, 0.2 mm, and 0.3 mm. The inventors of the present application have found through experimental research that when the outer circumferential wall of the limiting sleeve 3 and the inner circumferential wall of the installation cavity 21 are larger than the above-mentioned clearance range, the coaxiality between the limiting sleeve 3 and the installation cavity 21 cannot be guaranteed, and the problem of tilting when the press-fitted part 62 is placed is easy to occur. When the outer circumferential wall of the limiting sleeve 3 and the inner circumferential wall of the installation cavity 21 are smaller than the above-mentioned clearance range, the production and manufacturing costs of the limiting sleeve 3 and the cylinder 2 will increase, and the assembly will be inconvenient.

[0037] When the outer wall of the limit sleeve 3 of the assembly tool of the piston assembly of the embodiment of the present application and the inner wall of the installation cavity 21 adopt the above-mentioned clearance value, the coaxiality of the limit sleeve 3 and the installation cavity 21 can be ensured, the problem of tilting when the screw sleeve 43 is pressed downward can be reduced, and the production difficulty of the limit sleeve 3 and the cylinder body 2 can be reduced, and the subsequent assembly process of the limit sleeve 3 and the cylinder body 2 is convenient.

[0038] Alternatively, if Figure 3 and Figure 4 As shown, the inner wall of the limiting sleeve 3 is provided with a step portion 33, and the step portion 33 is arranged circumferentially around the inner wall of the limiting sleeve 3, and the step portion 33 is suitable for matching with the step groove 421 at the upper end of the lead screw 42. It can be understood that the step portion 33 is located at the connection position between the top plate 31 and the limiting body 32, and is arranged circumferentially around the top plate 31. Since the step groove 421 is the structure of the lead screw 42 itself, the step portion 33 cooperates with the step groove 421 to increase the contact area between the limiting sleeve 3 and the lead screw 42, thereby improving the uniformity of the force on the limiting sleeve 3 and the lead screw 42.

[0039] like Figure 1 and Figure 3As shown, the limiting sleeve 3 has a first position before press-fitting and a second position after press-fitting, and the limiting sleeve 3 can move downward from the first position to the second position under the action of an external force. In the second position, the upper end of the limiting sleeve 3 protrudes from the mounting cavity 21, and the lower end of the limiting sleeve 3 is suitable for being spaced apart from the piston 41. It can be understood that when the limiting sleeve 3 is in the first position, the limiting sleeve 3 is located in the mounting cavity 21, and the upper end of the limiting sleeve 3 protrudes from the mounting cavity 21, and the height of the limiting sleeve 3 when it is in the first position is higher than the height of the limiting sleeve 3 when it is in the second position. When the limiting sleeve 3 is press-fitted, the limiting sleeve 3 moves downward and moves from the first position to the second position.

[0040] Since the upper end surface of the limiting sleeve 3 is higher than the height of the cylinder 2 when the limiting sleeve 3 moves downward to the extreme position (second position), this height can be set as the target height, and the operator can determine whether the screw sleeve 43 is installed in place according to this target height. In other words, when the limiting sleeve 3 is stamped downward, the operator detects that the height is not the target height (that is, greater than the target height or less than the target height), it means that the screw sleeve 43 and the piston 41 have a problem of poor assembly, so that the operator can detect the assembly of the piston assembly 4. In addition, since the lower end of the limiting sleeve 3 is spaced apart from the piston 41 in the up and down direction, that is, there is a gap between the lower end surface of the limiting sleeve 3 and the upper end surface of the piston 41, so that the problem of interference between the limiting sleeve 3 and the piston 41 when the limiting sleeve 3 is pressed downward can be avoided, thereby improving the reliability of the limiting sleeve 3 pressing downward.

[0041] In some embodiments, Figure 3 and Figure 5 As shown, the lower end of the cylinder 2 has a support portion 22, and the support portion 22 is arranged at the bottom of the installation cavity 21 to support the piston 41. The support portion 22 has a through hole 23, and the through hole 23 is connected to the installation cavity 21. The inventor of the present application found through experimental research that after the screw sleeve 43 and the piston 41 are installed, due to the interference fit between the screw sleeve 43 and the piston 41, the piston 41 will expand and deform, and there may be a problem that the piston 41 is difficult to remove from the cylinder 2. Therefore, it is necessary to set a through hole 23 at the lower end of the cylinder 2 so that the operator can use a tool to pass through the through hole 23 to push the piston assembly 4 out of the installation cavity 21, thereby improving the convenience of disassembling the piston assembly 4.

[0042] Alternatively, if Figure 5As shown, the support portion 22 has a first annular surface 221 and a second annular surface 222. The second annular surface 222 is arranged above the first annular surface 221. In a projection plane orthogonal to the axial direction of the mounting cavity 21, the first annular surface 221 is located inside the second annular surface 222. At least one of the first annular surface 221 and the second annular surface 222 supports the piston 41. It can be understood that the first annular surface 221 and the second annular surface 222 are both arranged coaxially with the through hole 23, and the first annular surface 221 is located below the second annular surface 222. In the embodiment of the present application, the first annular surface 221 and the second annular surface 222 are both planes orthogonal to the axial direction of the installation cavity 21. In other words, the first annular surface 221 and the second annular surface 222 are both arranged perpendicular to the axial direction of the installation cavity 21. It can also be understood that the first annular surface 221 and the second annular surface 222 are parallel to the projection plane orthogonal to the axial direction of the installation cavity 21, the first annular surface 221 is against the piston 41, and the second annular surface 222 can have a certain gap with the piston 41. In other words, the piston 41 can be mainly supported by the first annular surface 221, and the second annular surface 222 can provide auxiliary support to the piston 41, so that the force of the screw sleeve 43 and the piston 41 during press-fitting is more balanced.

[0043] In some embodiments, there are multiple cylinders 2 and stop sleeves 3, multiple cylinders 2 are arranged at intervals on the base 1, and multiple stop sleeves 3 correspond to multiple bases 1 one by one. It can be understood that since there are multiple cylinders 2 and stop sleeves 3, the assembly tool of the piston assembly can assemble multiple piston assemblies 4 at the same time, which is conducive to improving the assembly efficiency of the piston assembly 4.

[0044] Optionally, the cylinder 2 and the base 1 are connected by a screw, so that the cylinder 2 and the base 1 can be prevented from moving relative to each other when the piston assembly 4 is press-fitted, thereby improving the stability of the press-fitting of the piston assembly 4. For another example, the cylinder 2 is directly placed on the base 1, so that it is convenient for the operator to move the position of the cylinder 2 and to disassemble and assemble the assembly tool. For another example, the cylinder 2 and the base 1 are integrally formed to facilitate the processing and manufacturing of the assembly tool.

[0045] The assembly equipment of another embodiment of the present invention includes: a stamping device and an assembly tool for a piston assembly, the assembly tool for the piston assembly is the assembly tool for the piston assembly of the present invention, the stamping device is arranged above the limit sleeve 3, and the stamping device can be moved in the up and down directions to stamp the limit sleeve 3.

[0046] According to the assembly equipment of the embodiment of the present invention, since the limiting sleeve 3 is sleeved on the outside of the lead screw 42 and the screw sleeve 43, the coaxiality of the lead screw 42 and the screw sleeve 43 can be ensured to avoid the problem of radial misalignment of the lead screw 42 and the screw sleeve 43, and the limiting sleeve 3 can slide relative to the installation cavity 21 in the up and down direction, so that the limiting sleeve 3 can be pressed down together with the lead screw 42 and the screw sleeve 43, so that the screw sleeve 43 can be aligned and pressed into the piston 41, thereby completing the assembly of the piston assembly 4. Therefore, the assembly equipment of the embodiment of the present invention can reduce the radial position deviation existing when the screw sleeve 43 and the piston 41 are pressed, and avoid the problem of instability during the press-fitting process of the piston assembly 4.

[0047] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0048] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0049] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; 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, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0051] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0052] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. An assembly tool for a piston assembly, It is characterized in that include: Base (1); A cylinder (2), the cylinder (2) being mounted on the base (1), the cylinder (2) being provided with a mounting cavity (21), the upper end of the mounting cavity (21) having an opening for press-fitting a piston (41); A limiting sleeve (3) is used to be sleeved on the outside of the lead screw (42) and the screw sleeve (43); the limiting sleeve (3) is installed at a position adjacent to the opening of the installation cavity (21) and is slidable relative to the installation cavity (21) in an up-down direction.

2. The assembly tool for the piston assembly according to claim 1, It is characterized in that The limiting sleeve (3) comprises a top plate (31) and a limiting body (32), wherein the top plate (31) is sealed on the upper end of the limiting body (32), the lower end surface of the top plate (31) is suitable for abutting against the upper end surface of the lead screw (42), and the limiting body (32) is sleeved on the outer sides of the lead screw (42) and the screw sleeve (43).

3. The assembly tool for the piston assembly according to claim 1, It is characterized in that The clearance value between the outer peripheral wall of the limiting sleeve (3) and the inner peripheral wall of the installation cavity (21) is greater than 0 and less than or equal to 0.3 mm.

4. The assembly tool for the piston assembly according to claim 1, It is characterized in that The inner wall of the limiting sleeve (3) is provided with a step portion (33), the step portion (33) is arranged around the circumference of the limiting sleeve (3), and the step portion (33) is suitable for matching with the step groove (421) at the upper end of the lead screw (42).

5. The assembly tool for the piston assembly according to claim 1, It is characterized in that The limiting sleeve (3) has a first position before press-fitting and a second position after press-fitting. Under the action of an external force, the limiting sleeve (3) can move downward from the first position to the second position. In the second position, the upper end of the limiting sleeve (3) protrudes from the installation cavity (21), and the lower end of the limiting sleeve (3) is suitable for being spaced apart from the piston (41).

6. The assembly tool for the piston assembly according to claim 1, It is characterized in that The cylinder (2) has a support portion (22), which is arranged at the lower end of the installation cavity (21) for supporting the piston (41), and the support portion (22) has a through hole (23), which is connected to the installation cavity (21).

7. The assembly tool for the piston assembly according to claim 6, It is characterized in that The support portion (22) has a first annular surface (221) and a second annular surface (222), wherein the second annular surface (222) is arranged above the first annular surface (221), and within a projection plane orthogonal to the axial direction of the mounting cavity (21), the first annular surface (221) is located within the second annular surface (222), and at least one of the first annular surface (221) and the second annular surface (222) supports the piston (41).

8. The assembly tool for the piston assembly according to claim 1, It is characterized in that There are a plurality of the cylinder bodies (2) and the limiting sleeves (3); the plurality of cylinder bodies (2) are arranged on the base (1) at intervals; and the plurality of limiting sleeves (3) correspond one to one to the plurality of bases (1).

9. An assembly tool for a piston assembly according to any one of claims 1 to 8, It is characterized in that The cylinder (2) and the base (1) are connected via a threaded member; or, the cylinder (2) is directly placed on the base (1); or, the cylinder (2) and the base (1) are integrally formed.

10. An assembly device, It is characterized in that include: An assembly tool for a piston assembly, wherein the assembly tool for a piston assembly is the assembly tool for a piston assembly according to any one of claims 1 to 9; A punching device is arranged above the limiting sleeve (3), and the punching device is movable in an up-down direction to punch the limiting sleeve (3).

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