Press fitting equipment for piston rod

Abstract

The utility model discloses press-fitting equipment for a piston rod, the press-fitting equipment comprises a base, a back plate, a first press-fitting part and a second press-fitting part, the base is provided with a bottom support for supporting the piston rod; the back plate is connected with the base; the first press-fitting part is movably arranged on the back plate, and the first press-fitting part is suitable for driving the check ring to move; the second press-fitting part is movably arranged on the back plate and is suitable for driving the limiting ring to move. According to the press-fitting device, the limiting ring and the check ring are sequentially installed through the second press-fitting part and the first press-fitting part, the assembling precision and efficiency are improved, uncertainty and damage possibly caused by manual operation are avoided, and the quality and performance of products are guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of vehicles, in particular to a press-fitting device for a piston rod. Background Art

[0002] In the manufacturing process of shock absorbers and similar mechanical devices, the matching assembly of the piston rod and the retaining ring is a crucial link. In the traditional assembly process, as described in patent CN103089897A, a groove is provided on the piston rod, and a limit ring is installed inside the groove, and then the retaining ring is assembled with the piston rod in a limit manner.

[0003] However, the assembly process in the related art is very easy to be scratched due to manual operation. The surface of the piston rod is usually covered with a coating to improve wear resistance and corrosion resistance. During the assembly process, if the surface of the piston rod is scratched, the coating will be damaged. As time goes by and the vehicle is used, it may cause oil leakage from the piston rod, which not only affects the performance of the shock absorber, but also may threaten the safety of the vehicle. Due to the uncertainty and instability of manual operation, it is difficult to ensure the consistency and qualification rate of the product, which not only increases the production cost but also reduces the production efficiency. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a press-fitting device for a piston rod. According to the press-fitting device of the utility model, the limit ring and the retaining ring are sequentially installed through the second press-fitting part and the first press-fitting part, thereby improving the precision and efficiency of assembly, avoiding the uncertainty and damage that may be caused by manual operation, and ensuring the quality and performance of the product.

[0005] According to the utility model, the press-fitting equipment is used for the piston rod, and the press-fitting equipment includes: a base, on which a bottom support for supporting the piston rod is arranged; a back plate, which is connected to the base; a first press-fitting part, which is movably arranged on the back plate, and is suitable for driving the retaining ring to move; a second press-fitting part, which is movably arranged on the back plate, and is suitable for driving the limit ring to move.

[0006] According to the press-fitting equipment of the utility model, a base is provided, which is the basic part of the press-fitting equipment and is used to provide stable support for the piston rod and other components. By providing a base support on the base, the base support can cooperate with the piston rod to position and support the piston rod, so that the piston rod maintains a stable posture during the assembly process. By providing a back plate, the back plate is connected to the base, providing support for installation and movement for the first press-fitting part and the second press-fitting part. After the piston rod cooperates with the base support, the piston rod can lean on the back plate to sequentially install the limit ring and the retaining ring through the second press-fitting part and the first press-fitting part respectively, thereby improving the accuracy and efficiency of assembly, avoiding the uncertainty and damage that may be caused by manual operation, and ensuring the quality and performance of the product.

[0007] Specifically, the assembly process begins when the piston rod is placed on the base and leans against the back plate. First, the second press-fitting part starts working, and the second press-fitting part drives the limit ring to move to the groove position on the piston rod and accurately installs the limit ring into the groove. Then, the first press-fitting part starts working. The first press-fitting part drives the retaining ring to move until the retaining ring wraps the limit ring to accurately place the retaining ring on the piston rod. During the assembly process, the stable support of the back plate and the base provides a solid foundation for the precise operation of the first press-fitting part and the second press-fitting part. At the same time, the mechanized operation of the press-fitting equipment ensures that each step of the operation remains accurate and consistent, thereby improving the accuracy and efficiency of the assembly.

[0008] According to some embodiments of the utility model, the pressing equipment also includes: a clamping device, which is movably arranged on the back plate and is suitable for contacting and driving the retaining ring to be pressed against the periphery of the piston rod after the retaining ring is sleeved on the outer periphery of the limiting ring.

[0009] According to some embodiments of the utility model, the first press-fitting part includes: a press-fitting plate, which is movably arranged on the back plate and is formed with a mounting hole suitable for the piston rod to pass through, and a recessed groove surrounding the outer periphery of the mounting hole is formed on one side of the press-fitting plate in the thickness direction, and the recessed groove is suitable for accommodating the retaining ring.

[0010] According to some embodiments of the present invention, the pressing device is movably disposed on the pressing plate and moves synchronously with the pressing plate.

[0011] According to some embodiments of the utility model, the clamping device includes: a first clamping seat and a second clamping seat, the first clamping seat and the second clamping seat are respectively arranged on the pressing plate and located on both sides of the mounting hole in a radial direction; wherein the first clamping seat and the second clamping seat are respectively provided with a first clamping claw and a second clamping claw, and at least one of the first clamping claw and the second clamping claw can be selectively moved toward each other to clamp the retaining ring.

[0012] According to some embodiments of the present invention, surfaces of the first pressing claw and the second pressing claw facing each other are respectively formed with pressing notches, and the pressing notches are configured as arc-shaped grooves.

[0013] According to some embodiments of the present invention, a track extending in the height direction is formed on the back plate, and the first press-fitting portion and the second press-fitting portion respectively cooperate with the track to move in the extension direction of the track.

[0014] According to some embodiments of the present utility model, a supporting portion for supporting the piston rod is provided on the back plate and is located between the track and the base.

[0015] According to some embodiments of the utility model, a support groove is formed on the support portion, the support groove is configured to be open in a direction away from the back plate and to have a gradually increasing cross-sectional area, and an inner wall of the support groove is suitable for abutting against the piston rod.

[0016] According to some embodiments of the present invention, the support portion is detachably disposed on the back plate.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 is a side view of a press-fitting device according to an embodiment of the utility model;

[0020] Figure 2 is a front view of a press-fitting device according to an embodiment of the utility model;

[0021] Figure 3 is a top view of a press-fitting device according to an embodiment of the utility model;

[0022] Figure 4 is a cross-sectional view from a side view of a press-fitting device according to an embodiment of the utility model;

[0023] Figure 5 It is a structural schematic diagram of a press-fitting device according to an embodiment of the utility model;

[0024] Figure 6 is an exploded view of a press-fitting device and a piston rod according to an embodiment of the utility model;

[0025] Figure 7It is a front view of a press-fitting device and a piston rod according to an embodiment of the utility model;

[0026] Figure 8 It is a cross-sectional view of a press-fitting device and a piston rod according to an embodiment of the utility model from a side perspective.

[0027] Reference numerals:

[0028] Pressing equipment 1;

[0029] Base 11, bottom support 111;

[0030] Back plate 12, rail 121;

[0031] A first press-fitting portion 13, a press-fitting plate 131, a mounting hole 132, and a sink 133;

[0032] A second press-fitting portion 14;

[0033] The clamping device 15, the first clamping portion 151, the first clamping claw 151a, the second clamping portion 152, the second clamping claw 152a;

[0034] Support portion 16. DETAILED DESCRIPTION

[0035] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0036] In the description of the present invention, it should 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" and the like indicate positions or positional relationships based on the positions or positional relationships described in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or 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.

[0038] In the assembly process of the related art, the piston rod surface is easily scratched due to manual operation. The piston rod surface is usually covered with a coating to improve wear resistance and corrosion resistance. During the assembly process, if the piston rod surface is scratched, the coating will be damaged. As time goes by and the vehicle is used, it may cause oil leakage from the piston rod, which not only affects the performance of the shock absorber, but also may threaten the safety of the vehicle. Due to the uncertainty and instability of manual operation, it is difficult to ensure the consistency and qualification rate of the product, which not only increases the production cost but also reduces the production efficiency.

[0039] Reference below Figure 1-Figure 8 A press-fitting device 1 according to an embodiment of the present invention is described.

[0040] like Figure 1-Figure 8 As shown, according to the utility model, the press-fitting device 1 is used for a piston rod, and the press-fitting device 1 includes a base 11, a back plate 12, a first press-fitting part 13 and a second press-fitting part 14. The base 11 is provided with a bottom support 111 for supporting the piston rod; the back plate 12 is connected to the base 11; the first press-fitting part 13 is movably arranged on the back plate 12, and the first press-fitting part 13 is suitable for driving the retaining ring to move; the second press-fitting part 14 is movably arranged on the back plate 12, and the second press-fitting part 14 is suitable for driving the limit ring to move.

[0041] According to the press-fitting device 1 of the utility model, by setting a base 11, the base 11 is the basic part of the press-fitting device 1, which is used to provide stable support for the piston rod and other components. By setting a base support 111 on the base 11, the base support 111 can cooperate with the piston rod to position and support the piston rod, so that the piston rod maintains a stable posture during the assembly process. By setting a back plate 12, the back plate 12 is connected to the base 11, providing installation and movement support for the first press-fitting part 13 and the second press-fitting part 14. After the piston rod cooperates with the base support 111, the piston rod can lean on the back plate 12 to sequentially install the limit ring and the retaining ring through the second press-fitting part 14 and the first press-fitting part 13 respectively, thereby improving the accuracy and efficiency of assembly, and avoiding the uncertainty and damage that may be caused by manual operation, thereby ensuring the quality and performance of the product.

[0042] Specifically, when the piston rod is placed on the base 111 and leans against the back plate 12, the assembly process begins. First, the second press-fitting part 14 starts to work, and the second press-fitting part 14 drives the limit ring to move to the groove position on the piston rod and accurately installs the limit ring into the groove. Then, the first press-fitting part 13 starts to work. The first press-fitting part 13 drives the retaining ring to move until the retaining ring wraps the limit ring to accurately place the retaining ring on the piston rod. During the assembly process, the stable support of the back plate 12 and the base 111 provides a solid foundation for the precise operation of the first press-fitting part 13 and the second press-fitting part 14. At the same time, the mechanized operation of the press-fitting equipment 1 enables each step of the operation to remain accurate and consistent, thereby improving the accuracy and efficiency of the assembly.

[0043] Therefore, according to the press-fitting equipment 1 of the utility model, the limit ring and the retaining ring are installed in sequence through the second press-fitting part 14 and the first press-fitting part 13, which improves the assembly accuracy and efficiency, avoids the uncertainty and damage that may be caused by manual operation, and ensures the quality and performance of the product.

[0044] According to some embodiments of the present invention, Figure 3 As shown, the base 111 is formed with a positioning groove which is open away from the base 11, and the positioning groove is suitable for accommodating the end of the piston rod. The shape and size of the positioning groove match the end of the piston rod. The positioning groove is open on the base 111 away from the base 11, and the piston rod can be easily placed therein, thereby ensuring the stability and accuracy of the piston rod during the assembly process, and helping to prevent the piston rod from moving or tilting during the assembly process.

[0045] It should be noted that the base 111 can be detachably mounted on the base 11 , so that the size and shape of the positioning groove can be changed to adapt to different types of piston rods.

[0046] According to some embodiments of the present invention, Figure 1 , Figure 4 and Figure 6 As shown, the pressing device 1 also includes a clamping device 15, which is movably arranged on the back plate 12 and is suitable for contacting the retaining ring and driving the retaining ring to be pressed against the periphery of the piston rod after the retaining ring is sleeved on the periphery of the limiting ring. By setting the clamping device 15, the clamping device 15 is used to apply pressure to the retaining ring after the retaining ring is sleeved on the periphery of the limiting ring, so that the retaining ring can be tightly and stably fixed on the periphery of the piston rod. The clamping device 15 can move along the back plate 12, so that the clamping device 15 can be adjusted according to the actual position of the piston rod, the retaining ring and the limiting ring. When the retaining ring is sleeved on the periphery of the limiting ring, the clamping device 15 will move to the position of the retaining ring and contact the retaining ring to apply enough pressure so that the retaining ring fits tightly on the periphery of the piston rod, thereby achieving a tight connection between the retaining ring and the piston rod, so that the retaining ring is not easy to loosen or fall off during subsequent use.

[0047] According to some embodiments of the present invention, Figure 2 , Figure 3 and Figure 5 As shown, the first press-fitting part 13 includes a press-fitting plate 131, which is movably arranged on the back plate 12. The press-fitting plate 131 is formed with a mounting hole 132 suitable for the piston rod to pass through. The press-fitting plate 131 can provide a platform for positioning and supporting the retaining ring, and can be moved along the back plate 12 to adjust the relative position of the retaining ring and the piston rod. There is a mounting hole 132 on the press-fitting plate 131, and the size and shape of the mounting hole 132 match the piston rod, so that the piston rod can pass through the press-fitting plate 131. When the piston rod passes through the mounting hole 132, the press-fitting plate 131 can be accurately positioned on the piston rod, preparing for the subsequent retaining ring installation. A sink groove 133 surrounding the outer periphery of the mounting hole 132 is formed on one side of the press-fitting plate 131 in the thickness direction, and the sink groove 133 is suitable for accommodating the retaining ring. The shape and size of the sink groove 133 are sufficient to accommodate the retaining ring. When the retaining ring is placed in the recess 133 , the retaining ring can surround the outer circumference of the piston rod and can be positioned at a pre-installed position on the piston rod by moving the press plate 131 .

[0048] It should be noted that the first press-fitting portion 13 can be detachably mounted on the back plate 12 , so that the size and shape of the mounting hole 132 can be changed to adapt to different types of piston rods.

[0049] According to some embodiments of the utility model, the clamping device 15 is movably arranged on the pressing plate 131 and moves synchronously with the pressing plate 131. The clamping device 15 can apply pressure to tightly fix the retaining ring on the piston rod. By installing the clamping device 15 on the pressing plate 131, the clamping device 15 can move with the movement of the pressing plate 131, allowing the clamping device 15 to always maintain a relative position with the pressing plate 131 when the pressing plate 131 moves, and also maintain a relative position with the retaining ring on the pressing plate 131, thereby ensuring that during the pressing process, the clamping device 15 can accurately act on the retaining ring to apply sufficient pressure to the retaining ring so that the retaining ring can be tightly fixed on the piston rod. When the clamping device 15 acts on the retaining ring, in order to apply pressure to the retaining ring, the clamping device 15 and the pressing plate 131 are relatively moved.

[0050] According to some embodiments of the present invention, Figure 2As shown, the clamping device 15 includes a first clamping seat 151 and a second clamping seat 152, which are respectively arranged on the press-fitting plate 131 and located on both sides of the mounting hole 132 in the radial direction; wherein the first clamping seat 151 and the second clamping seat 152 are respectively provided with a first clamping claw 151a and a second clamping claw 152a, and at least one of the first clamping claw 151a and the second clamping claw 152a can be selectively moved toward each other to clamp the retaining ring. The first clamping seat 151 and the second clamping seat 152 are respectively arranged on both sides of the press-fitting plate 131, specifically, on both sides in the diameter direction of the mounting hole 132. The first pressing seat 151 and the second pressing seat 152 are respectively installed with the first pressing claw 151a and the second pressing claw 152a, so the first pressing claw 151a and the second pressing claw 152a are also located on both sides of the diameter direction of the mounting hole 132, so that the first pressing claw 151a and the second pressing claw 152a can act on the retaining ring from both sides of the retaining ring to compress the retaining ring. At least one of the first pressing claw 151a and the second pressing claw 152a (any one or both) can selectively move toward each other, so the first pressing claw 151a and the second pressing claw 152a can move closer to or away from each other to adjust the distance between each other, thereby compressing or loosening the retaining ring. When the first pressing claw 151a and the second pressing claw 152a move toward each other, the retaining ring located between the two will be squeezed, and the squeezing force enables the retaining ring to fit tightly on the piston rod, thereby ensuring the stability and reliability of the retaining ring.

[0051] According to some embodiments of the utility model, the surfaces of the first pressing claw 151a and the second pressing claw 152a facing each other are respectively formed with pressing notches, and the pressing notches are configured as arc-shaped grooves. When the first pressing claw 151a and the second pressing claw 152a move toward each other and press the retaining ring, the first pressing claw 151a and the second pressing claw 152a are respectively in contact with the retaining ring through the pressing notches. The pressing notches are configured as arc-shaped grooves, and the arc-shaped grooves can better fit the edges of the retaining rings, so that the retaining rings are evenly pressed, and the retaining rings can be evenly stressed when subjected to pressure, so that the first pressing claw 151a and the second pressing claw 152a can press the retaining rings in a more effective and stable manner.

[0052] It should be noted that the first clamping claw 151a can be detachably mounted on the first clamping seat 151, and the second clamping claw 152a can be detachably mounted on the second clamping seat 152, so that the size of the mounting hole 132 can be changed to accommodate different types of piston rods.

[0053] According to some embodiments of the present invention, Figure 1 , Figure 2 , Figure 4-Figure 6As shown, a track 121 extending in the height direction is formed on the back plate 12, and the first press-fitting part 13 and the second press-fitting part 14 cooperate with the track 121 respectively to move in the extension direction of the track 121. The track 121 is used to provide a moving path for the first press-fitting part 13 and the second press-fitting part 14, and the first press-fitting part 13 and the second press-fitting part 14 can move in the height direction along the track 121 to perform a press-fitting operation. Specifically, the first press-fitting part 13 can drive the retaining ring to move in the height direction, so the relative position of the retaining ring and the piston rod can be adjusted by the movement of the first press-fitting part 13, so as to install the retaining ring in the pre-installed position; and the second press-fitting part 14 can drive the limit ring to move in the height direction, so the relative position of the limit ring and the piston rod can be adjusted by the movement of the second press-fitting part 14, so as to install the limit ring in the pre-installed position.

[0054] According to some embodiments of the present invention, Figure 1 , Figure 2 , Figure 4-Figure 6 As shown, a support portion 16 for supporting the piston rod is provided on the back plate 12 between the rail 121 and the bottom bracket 111, so that the support portion 16 can provide stable support during the movement or press-fitting of the piston rod. Specifically, the bottom bracket 111 is used on the bottom plate to provide height support for the piston rod, and the support portion 16 is used on the back plate 12 to provide lateral support for the piston rod, which further ensures the accuracy and stability of the press-fitting operation and makes the press-fitting operation smoother.

[0055] According to some embodiments of the present invention, Figure 5 As shown, a support groove is formed on the support portion 16. The support groove is configured to be open in a direction away from the back plate 12 and the cross-sectional area gradually increases. The inner wall of the support groove is suitable for abutting against the piston rod. The piston rod can enter the support groove through the opening of the support groove and obtain stable support in the support groove. Since the cross-sectional area of ​​the support groove gradually increases in a direction away from the back plate 12, the piston rod gradually abuts against the inner wall of the support groove in the process of gradually penetrating into the support groove, providing stable support for the piston rod, thereby ensuring the stability of the piston rod during the press-fitting process.

[0056] According to some embodiments of the present invention, the support portion 16 is detachably disposed on the back plate 12 , so that the size and shape of the support groove can be changed to accommodate piston rods of different sizes.

[0057] According to some embodiments of the utility model, a friction-reducing layer suitable for contacting with the piston rod is provided on the second press-fitting portion 14. During the movement of the second press-fitting portion 14, the friction-reducing layer can effectively reduce the contact friction between the piston rod and the second press-fitting portion 14, thereby reducing energy loss and improving the operating efficiency of the equipment. In addition, the friction-reducing layer can also protect the surface of the piston rod, reduce the risk of wear, and increase the service life of the piston rod.

[0058] According to some embodiments of the present invention, a detection member suitable for detecting the contact pressure with the piston rod is provided on the second press-fitting portion 14. The pressure data obtained by the detection member can be used to evaluate the state of the second press-fitting portion 14, such as whether there is abnormal pressure fluctuation, whether the preset pressure is reached, etc.

[0059] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means 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 utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0060] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A press-fitting device for a piston rod, characterized in that: include: A base (11), wherein a bottom bracket (111) for supporting a piston rod is provided on the base (11); A back plate (12), wherein the back plate (12) is connected to the base (11); A first press-fitting portion (13), the first press-fitting portion (13) being movably disposed on the back plate (12), and the first press-fitting portion (13) being suitable for driving the retaining ring to move; A second press-fitting portion (14), wherein the second press-fitting portion (14) is movably arranged on the back plate (12), and the second press-fitting portion (14) is suitable for driving the limit ring to move.

2. The press-fitting device for a piston rod according to claim 1, characterized in that: Also includes: A clamping device (15) is movably arranged on the back plate (12) and is suitable for contacting the retaining ring and driving the retaining ring to be pressed against the outer periphery of the piston rod after the retaining ring is sleeved on the outer periphery of the limiting ring.

3. The press-fitting device for a piston rod according to claim 2, characterized in that: The first press-fitting portion (13) comprises: A press plate (131), the press plate (131) is movably arranged on the back plate (12); a mounting hole (132) suitable for the piston rod to pass through is formed on the press plate (131); a recessed groove (133) surrounding the outer periphery of the mounting hole (132) is formed on one side of the press plate (131) in the thickness direction; the recessed groove (133) is suitable for accommodating the retaining ring.

4. The press-fitting device for a piston rod according to claim 3, characterized in that: The pressing device (15) is movably arranged on the pressing plate (131) and moves synchronously with the pressing plate (131).

5. The press-fitting device for a piston rod according to claim 4, characterized in that: The pressing device (15) comprises: A first pressing seat (151) and a second pressing seat (152), wherein the first pressing seat (151) and the second pressing seat (152) are respectively arranged on the pressing plate (131) and located on both sides of the mounting hole (132) in a radial direction; The first pressing seat (151) and the second pressing seat (152) are respectively provided with a first pressing claw (151a) and a second pressing claw (152a), and at least one of the first pressing claw (151a) and the second pressing claw (152a) can be selectively moved toward each other to press the retaining ring.

6. The press-fitting device for a piston rod according to claim 5, characterized in that: The surfaces of the first pressing claw (151a) and the second pressing claw (152a) facing each other are respectively formed with pressing notches, and the pressing notches are configured as arc-shaped grooves.

7. The press-fitting device for a piston rod according to claim 1, characterized in that: A track (121) extending in the height direction is formed on the back plate (12), and the first press-fitting portion (13) and the second press-fitting portion (14) respectively cooperate with the track (121) to move in the extension direction of the track (121).

8. The press-fitting device for a piston rod according to claim 7, characterized in that: The back plate (12) is provided with a support portion (16) located between the track (121) and the base (111) and used for supporting the piston rod.

9. The press-fitting device for a piston rod according to claim 8, characterized in that: A support groove is formed on the support portion (16), the support groove is configured to be open in a direction away from the back plate (12) and to have a gradually increasing cross-sectional area, and the inner wall of the support groove is suitable for abutting against the piston rod.

10. The press-fitting device for a piston rod according to claim 8, characterized in that: The support portion (16) is detachably arranged on the back plate (12).

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