A height adjustable shock absorber

Abstract

The present invention relates to the field of shock absorbers, and in particular to a height-adjustable shock absorber, comprising a housing, a piston is fittedly installed inside the housing, a rod is coaxially fixedly installed on the upper end of the piston, the rod slides through the upper end of the housing, two oil holes are symmetrically penetrated through the upper end surface of the piston, a spring body is installed on the outer side of the housing and the outer side of the rod, an adjustment column is fittedly installed inside the rod, the two ends of the adjustment column penetrate from the upper and lower ends of the rod, the lower end of the adjustment column extends into the interior of the piston and is elastically connected to the inner bottom surface of the piston, two sealing ears are symmetrically penetrated and installed inside the piston, and the sealing ears extend into the interior of the oil hole. The present invention can reasonably adjust the hardness of the shock absorber, effectively meet the use requirements, and is convenient to use.

Description

Technical Field

[0001] The invention relates to the field of shock absorbers, and in particular to a height-adjustable shock absorber. Background Art

[0002] When the shock absorber is subjected to force, the spring will deform, and the piston in the shock absorber will also reciprocate in the cylinder. Then the oil in the shock absorber housing will repeatedly flow from one inner cavity through the pores on the piston into another inner cavity. At this time, the friction between the hole wall and the oil and the friction within the liquid molecules will form a damping force on the vibration to accelerate the attenuation of the vibration of the frame and the body, so as to improve the driving smoothness of the car. However, the size of the oil hole on the piston in the existing shock absorber is constant and cannot be adjusted, resulting in the inability to reasonably adjust the hardness of the shock absorber according to the required use, which limits its use and makes it difficult to meet the required use. Summary of the invention

[0003] The purpose of the present invention is to solve the shortcomings of the background technology and to propose a height-adjustable shock absorber.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is: a height-adjustable shock absorber, comprising a shell, a piston is fittedly installed inside the shell, a rod is coaxially fixedly installed on the upper end of the piston, the rod slides through the upper end of the shell, and two oil holes are symmetrically penetrated through the upper end surface of the piston, a spring body is installed on the outer side of the shell and the outer side of the rod, an adjusting column is fittedly installed inside the rod, two ends of the adjusting column penetrate from the upper and lower ends of the rod, the lower end of the adjusting column extends into the interior of the piston and is elastically connected to the inner bottom surface of the piston, two sealing ears are symmetrically installed inside the piston, the sealing ears extend into the interior of the oil hole, an H-shaped push rack is connected between the sealing ears and the adjusting column, a pushing member is installed on the upper end of the rod, and the pushing member fits with the top of the adjusting column.

[0005] Preferably, a groove is coaxially opened at the lower end of the adjusting column, a sliding hole is coaxially opened at the inner top surface of the groove, a limiting column is fixedly installed at the center position of the inner bottom surface of the piston, the limiting column passes through the interior of the groove, and the upper end of the limiting column is fitted into the interior of the sliding hole.

[0006] Preferably, a return spring is wound around the outer side of the limiting column, the lower end of the return spring is fixed to the inner bottom surface of the piston, the upper end of the return spring is fixed to the inner top surface of the groove, the upper end of the H-shaped push frame is penetrated and inlaid with a No. 2 connecting shaft, a No. 2 lug is rotatably installed in the middle of the outer surface of the No. 2 connecting shaft, and the end of the No. 2 lug is fixed to the adjusting column.

[0007] Preferably, a No. 1 connecting shaft is embedded through the lower end of the H-shaped push frame, a No. 1 lug is rotatably installed on the middle of the outer surface of the No. 1 connecting shaft, the end of the No. 1 lug is fixed to the sealing ear, and two guide grooves are symmetrically penetrated through the interior of the piston, the guide grooves extend to the inner wall of the oil hole, and the sealing ear is tightly attached to the inside of the guide grooves.

[0008] Preferably, a lower cap is fixedly mounted on the lower end of the spring body, and the lower cap is embedded in the outer surface of the device shell. A lower ear extends from the lower end of the device shell, and an upper cap is fixedly mounted on the upper end of the spring body, and the upper cap fits the outer surface of the device rod.

[0009] Preferably, the pushing member includes a fixing ring coaxially embedded at the edge of the outer surface of the rod, and two connecting frames are symmetrically fixedly installed on the upper end of the fixing ring, and bearing caps are fixedly installed on the upper ends of the two connecting frames. A No. 2 adjustment seat is slidably installed between the two connecting frames, and the lower end of the No. 2 adjustment seat is stepped, and the lower end of the No. 2 adjustment seat is attached to the top of the adjustment column.

[0010] Preferably, the front and rear ends of the No. 2 adjusting seat are both provided with a No. 3 slide groove, and the opposite surfaces of the two connecting frames are extended with a No. 2 slider, and the No. 2 slider fits inside the No. 3 slide groove, and the upper end of the upper top cap is symmetrically fixed with two top columns, and the opposite ends of the two connecting frames are slidably installed with the No. 1 adjusting seat, the lower end of the No. 1 adjusting seat is stepped, and the lower end of the No. 1 adjusting seat fits with the top of the top column, and the top of the top column and the top of the adjusting column are both spherical, and a fixing frame is fixedly installed between the side of the No. 2 adjusting seat and the side of the No. 1 adjusting seat, and the step of the No. 2 adjusting seat is smaller than the step of the No. 1 adjusting seat.

[0011] Preferably, a protruding ear is extended on one side of the two connecting frames, a driving shaft is rotatably installed between the two protruding ears, a gear is coaxially inlaid on the outer surface of the driving shaft, a toothed plate is fixedly installed on the upper end of the No. 2 adjustment seat, the toothed plate is meshed with the gear, a No. 1 slider is extended from the opposite ends of the two connecting frames, a No. 1 slide groove is provided on the opposite surfaces of the two No. 1 adjustment seats, the No. 1 slider fits inside the No. 1 slide groove, an upper connecting ear is extended from the upper end of the bearing cap, a No. 2 slide groove is provided on the other side of the connecting frame, a guide frame is fixedly installed on the upper end of the upper cap, and the end of the guide frame fits inside the No. 2 slide groove.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. By moving the No. 2 adjustment seat, the step at the lower end of the No. 2 adjustment seat can be used to press down the adjustment column, so that the adjustment column can slide downward in the device rod, thereby driving the H-shaped push frame to move, so as to push the sealing ear, so that the sealing ear can slide in the guide groove to extend into the oil hole, so as to change the size of the oil hole, that is, change the resistance of the oil flow process, so that the contraction height of the shock absorber when subjected to force is changed, thereby changing the damping size of the shock absorber, so as to achieve the soft and hard adjustment of the shock absorber to meet its use requirements.

[0014] 2. When the No. 2 adjustment seat is moving, the No. 1 adjustment seat will move synchronously with the No. 2 adjustment seat, so as to use the step at the lower end of the No. 1 adjustment seat to press down the top column, so that the upper cap can slide down on the surface of the rod to compress the spring body, causing the spring body to shrink and deform, thereby changing the deformation distance of the spring body when subjected to force, so as to further realize the hardness and softness adjustment of the shock absorber, and this scheme can simultaneously adjust the size of the oil hole and the deformation distance of the spring body, which effectively facilitates use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a height-adjustable shock absorber of the present invention;

[0016] Figure 2 An internal view of a housing of a height-adjustable shock absorber according to the present invention;

[0017] Figure 3 An internal view of a piston of a height-adjustable shock absorber according to the present invention;

[0018] Figure 4 It is a schematic diagram of a No. 1 adjustment seat of a height adjustable shock absorber of the present invention;

[0019] Figure 5 It is a schematic diagram of another viewing angle of a No. 1 adjustment seat of a height adjustable shock absorber of the present invention;

[0020] Figure 6 The figure is a schematic diagram of a second adjustment seat of a height-adjustable shock absorber of the present invention.

[0021] In the figure: 1, housing; 2, rod; 3, bearing cap; 4, upper ear; 5, spring body; 6, lower top cap; 7, lower ear; 8, No. 1 adjustment seat; 9, piston; 10, oil hole; 11, adjustment column; 12, top column; 13, fixing ring; 14, connecting frame; 15, No. 2 adjustment seat; 16, No. 1 slide; 17, No. 1 slider; 18, No. 2 slide; 19, guide frame; 20, upper Top cap; 21. Extending ear; 22. Gear; 23. Driving shaft; 24. Tooth plate; 25. Slide slot No. 3; 26. Sliding block No. 2; 27. Fixed frame; 28. Sliding hole; 29. ​​Limiting column; 30. Groove; 31. Return spring; 32. Guide groove; 33. Sealing ear; 34. Lug No. 1; 35. Lug No. 2; 36. Connecting shaft No. 1; 37. Connecting shaft No. 2; 38. H-shaped push frame. DETAILED DESCRIPTION

[0022] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0023] like Figure 1-Figure 6 The height-adjustable shock absorber shown in the figure comprises a shell 1, a piston 9 is fitted inside the shell 1, a rod 2 is coaxially fixedly mounted on the upper end of the piston 9, the rod 2 serves to connect the piston 9, the rod 2 slides through the upper end of the shell 1, and two oil holes 10 are symmetrically penetrated through the upper end surface of the piston 9, the oil holes 10 serve to allow oil to repeatedly flow from one inner cavity to another, a spring body 5 is installed on the outer side of the shell 1 and the outer side of the rod 2, an adjusting column 11 is fitted inside the rod 2, and the adjusting column 11 serves to drive the H-shaped push frame 38 to move. The two ends of the adjusting column 11 extend from the upper and lower ends of the rod 2, the lower end of the adjusting column 11 extends into the interior of the piston 9 and is elastically connected to the inner bottom surface of the piston 9, and two sealing ears 33 are symmetrically installed inside the piston 9, and the sealing ears 33 extend into the interior of the oil through hole 10. The sealing ears 33 play a role in adjusting the size of the oil through hole 10. An H-shaped push rack 38 is connected between the sealing ears 33 and the adjusting column 11, and a pushing member is installed on the upper end of the rod 2. The pushing member fits with the top of the adjusting column 11, and the H-shaped push rack 38 drives the sealing ears 33 to move.

[0024] A groove 30 is coaxially opened at the lower end of the adjusting column 11, and a sliding hole 28 is coaxially opened at the inner top surface of the groove 30. The groove 30 serves to accommodate the reset spring 31. A limiting column 29 is fixedly installed at the center position of the inner bottom surface of the piston 9. The sliding hole 28 can allow the limiting column 29 to slide to avoid obstruction when the adjusting column 11 moves downward. The limiting column 29 runs through the interior of the groove 30, and the upper end of the limiting column 29 fits into the interior of the sliding hole 28.

[0025] A return spring 31 is wound around the outer side of the limiting column 29, and the lower end of the return spring 31 is fixed to the inner bottom surface of the piston 9. The return spring 31 can support the adjusting column 11 so that the adjusting column 11 and the No. 2 adjusting seat 15 can always be in contact. The upper end of the return spring 31 is fixed to the inner top surface of the groove 30, and the upper end of the H-shaped push frame 38 is penetrated and inlaid with a No. 2 connecting shaft 37, and a No. 2 lug 35 is rotatably installed in the middle of the outer surface of the No. 2 connecting shaft 37. The No. 2 connecting shaft 37 and the No. 2 lug 35 serve to facilitate the connection between the H-shaped push frame 38 and the adjusting column 11, and the end of the No. 2 lug 35 is fixed to the adjusting column 11.

[0026] The lower end of the H-shaped push frame 38 is penetrated and inlaid with a No. 1 connecting shaft 36, and the middle part of the outer surface of the No. 1 connecting shaft 36 is rotatably installed with a No. 1 lug 34. The No. 1 connecting shaft 36 and the No. 1 lug 34 serve to facilitate the fixation of the H-shaped push frame 38 and the sealing lug 33. The end of the No. 1 lug 34 is fixed to the sealing lug 33. Two guide grooves 32 are symmetrically penetrated inside the piston 9. The guide grooves 32 extend to the inner wall of the oil through hole 10. The guide grooves 32 serve to allow the sealing lug 33 to pass through and guide the sealing lug 33. The sealing lug 33 is tightly attached to the inside of the guide grooves 32.

[0027] A lower top cap 6 is fixedly installed on the lower end of the spring body 5, and the lower top cap 6 is embedded in the outer surface of the device shell 1. The lower top cap 6 supports the lower part of the spring body 5. A lower connecting ear 7 is extended from the lower end of the device shell 1. The lower connecting ear 7 facilitates installation. An upper top cap 20 is fixedly installed on the upper end of the spring body 5. The upper top cap 20 is attached to the outer surface of the device rod 2, and the upper top cap 20 supports the upper part of the spring body 5.

[0028] The pushing member includes a fixing ring 13 coaxially embedded at the edge of the outer surface of the rod 2, and two connecting frames 14 are symmetrically fixedly installed on the upper end of the fixing ring 13. The fixing ring 13 plays a role in supporting the connecting frames 14. The upper ends of the two connecting frames 14 are fixedly installed with bearing caps 3, and the bearing caps 3 play a role in supporting the upper connecting ears 4. A No. 2 adjusting seat 15 is slidably installed between the two connecting frames 14. The lower end of the No. 2 adjusting seat 15 is stepped, and the lower end of the No. 2 adjusting seat 15 is attached to the top of the adjusting column 11. The No. 2 adjusting seat 15 plays a role in pressing down the adjusting column 11.

[0029] The front and rear ends of the No. 2 adjusting seat 15 are both provided with a No. 3 slide groove 25, and the opposite surfaces of the two connecting frames 14 are extended with a No. 2 slider 26. The No. 3 slide groove 25 and the No. 2 slider 26 play a role in guiding the No. 2 adjusting seat 15, and the No. 2 slider 26 fits inside the No. 3 slide groove 25. The upper end of the upper top cap 20 is symmetrically fixed with two top columns 12, and the top column 12 plays a role in being pressed by the No. 1 adjusting seat 8. The No. 1 adjusting seat 8 is slidably installed on the opposite ends of the two connecting frames 14. The lower end of the No. 1 adjusting seat 8 is stepped, and the lower end of the No. 1 adjusting seat 8 fits on the top of the top column 12. The No. 1 adjusting seat 8 moves. At this time, the No. 1 slide groove 16 on the No. 1 adjusting seat 8 slides on the No. 1 slider 17 to assist the No. 1 adjusting seat 8 to move. The step at the lower end of the No. 1 adjusting seat 8 is used to press down the top column 12, so that the upper cap 20 can slide downward on the surface of the device rod 2 to compress the spring body 5, allowing the spring body 5 to shrink and deform, thereby changing the deformation distance of the spring body 5 when subjected to force. The top of the top column 12 and the top of the adjusting column 11 are both spherical, which can be convenient for passing through the step. A fixing frame 27 is fixedly installed between the side of the No. 2 adjusting seat 15 and the side of the No. 1 adjusting seat 8. The fixing frame 27 serves to fix the No. 2 adjusting seat 15 and the No. 1 adjusting seat 8 together. The step of the No. 2 adjusting seat 15 is smaller than the step of the No. 1 adjusting seat 8, which can allow the displacement of the sealing ear 33 to adapt to the size of the oil hole 10 and the displacement of the upper cap 20 to adapt to the deformation distance of the spring body 5.

[0030] A protruding ear 21 is extended on one side of the two connecting frames 14, and a driving shaft 23 is rotatably installed between the two protruding ears 21. The protruding ear 21 plays a role in bearing the driving shaft 23. The driving shaft 23 can be driven by an external motor, thereby driving the gear 22 to rotate. At the same time, the motor can adopt a servo motor with a brake to ensure that the gear 22 will not self-rotate after adjustment. The outer surface of the driving shaft 23 is coaxially inlaid with a gear 22. A toothed plate 24 is fixedly installed on the upper end of the No. 2 adjustment seat 15. The gear 22 plays a role in driving the toothed plate 24 to move, and the toothed plate 24 is meshed with the gear 22. A No. 1 slider 17 is extended from the opposite ends of the two connecting frames 14. The two No. 1 adjustment seats The opposite surfaces of the mounting plate 8 are provided with a No. 1 slide groove 16, and the No. 1 slider 17 and the No. 1 slide groove 16 serve to guide the No. 1 adjustment seat 8. The shapes of the No. 1 slider 17 and the No. 1 slide groove 16 are the same as the shapes of the No. 3 slide groove 25 and the No. 2 slider 26. The No. 1 slider 17 fits inside the No. 1 slide groove 16. The upper end of the bearing cap 3 extends with an upper ear 4, and the upper ear 4 serves to facilitate installation. The other side of the connecting frame 14 is provided with a No. 2 slide groove 18, and the upper end of the upper cap 20 is fixedly installed with a guide frame 19. The No. 2 slide groove 18 and the guide frame 19 can guide the upper cap 20 so that the upper cap 20 will not rotate, and the end of the guide frame 19 fits inside the No. 2 slide groove 18.

[0031] When in use, the gear 22 rotates to drive the toothed plate 24 meshing with the gear 22 to move, thereby driving the No. 2 adjusting seat 15 to move. At this time, the No. 3 slide groove 25 on the No. 2 adjusting seat 15 slides on the No. 2 slider 26 to guide the No. 2 adjusting seat 15, so as to use the step at the lower end of the No. 2 adjusting seat 15 to press down the adjusting column 11, so that the adjusting column 11 can slide down in the device rod 2. At this time, the limiting column 29 slides in the sliding hole 28, and the return spring 31 shrinks and deforms, so that the adjusting column 11 can move down normally, so as to use the downward moving adjusting column 11 to drive the H-shaped push frame 38 to move, so as to push the sealing ear 33, so that the sealing ear 33 can slide in the guide groove 32 to extend into the oil through hole 10, so as to change The size of the oil hole 10, that is, the size of the resistance to the flow of oil, changes the contraction height of the shock absorber when it is subjected to force, thereby changing the damping size of the shock absorber to achieve the hardness and softness adjustment of the shock absorber. At the same time, the moving No. 2 adjustment seat 15 will also synchronously drive the No. 1 adjustment seat 8 to move. At this time, the No. 1 slide groove 16 on the No. 1 adjustment seat 8 slides on the No. 1 slider 17 to assist the movement of the No. 1 adjustment seat 8, and the step at the lower end of the No. 1 adjustment seat 8 is used to press down the top column 12, so that the upper top cap 20 can slide down on the surface of the device rod 2 to compress the spring body 5, allowing the spring body 5 to shrink and deform, thereby changing the deformation distance of the spring body 5 when subjected to force, so as to further achieve the hardness and softness adjustment of the shock absorber.

[0032] In the present invention, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the description of this specification, if the terms "one embodiment", "some embodiments", "specific embodiments" and the like appear, it 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 present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0034] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A height-adjustable shock absorber, comprising a housing (1), a piston (9) being fittedly mounted inside the housing (1), a rod (2) being coaxially fixedly mounted on the upper end of the piston (9), the rod (2) slidingly passing through the upper end of the housing (1), two oil holes (10) being symmetrically formed through the upper end surface of the piston (9), a spring body (5) being mounted on the outer side of the housing (1) and the outer side of the rod (2), characterized in that: An adjusting column (11) is fitted inside the device rod (2), and the two ends of the adjusting column (11) extend from the upper and lower ends of the device rod (2). The lower end of the adjusting column (11) extends into the interior of the piston (9) and is elastically connected to the inner bottom surface of the piston (9). Two sealing ears (33) are symmetrically installed inside the piston (9), and the sealing ears (33) extend into the interior of the oil hole (10). An H-shaped push frame (38) is connected between the sealing ears (33) and the adjusting column (11). A pushing member is installed at the upper end of the device rod (2), and the pushing member is fitted with the top of the adjusting column (11); A lower cap (6) is fixedly mounted on the lower end of the spring body (5), and the lower cap (6) is embedded in the outer surface of the housing (1). A lower connecting ear (7) extends from the lower end of the housing (1). An upper cap (20) is fixedly mounted on the upper end of the spring body (5), and the upper cap (20) is attached to the outer surface of the rod (2). The pusher comprises a fixing ring (13) coaxially embedded on the edge of the outer surface of the device rod (2), two connecting frames (14) are symmetrically fixedly installed on the upper end of the fixing ring (13), a bearing cap (3) is fixedly installed on the upper ends of the two connecting frames (14), a second adjustment seat (15) is slidably installed between the two connecting frames (14), the lower end of the second adjustment seat (15) is stepped, and the lower end of the second adjustment seat (15) is in contact with the top of the adjustment column (11); The front and rear ends of the No. 2 adjustment seat (15) are both provided with a No. 3 slide groove (25), and the opposite surfaces of the two connecting frames (14) are both extended with a No. 2 slider (26), and the No. 2 slider (26) is fitted inside the No. 3 slide groove (25). The upper end of the upper top cap (20) is symmetrically fixedly installed with two top columns (12), and the opposite ends of the two connecting frames (14) are both slidably installed with a No. 1 adjustment seat (8), the lower end of the No. 1 adjustment seat (8) is stepped, and the lower end of the No. 1 adjustment seat (8) is fitted with the top of the top column (12), and the top of the top column (12) and the top of the adjustment column (11) are both spherical. A fixing frame (27) is fixedly installed between the side surface of the No. 2 adjustment seat (15) and the side surface of the No. 1 adjustment seat (8), and the step of the No. 2 adjustment seat (15) is smaller than the step of the No. 1 adjustment seat (8); A protruding ear (21) is extended from one side of the two connecting frames (14), a driving shaft (23) is rotatably installed between the two protruding ears (21), and a gear (22) is coaxially inlaid on the outer surface of the driving shaft (23). A toothed plate (24) is fixedly installed on the upper end of the No. 2 adjustment seat (15), and the toothed plate (24) is meshed with the gear (22). A No. 1 slider (17) is extended from the opposite ends of the two connecting frames (14), and a No. 1 slide groove (16) is provided on the opposite surfaces of the two No. 1 adjustment seats (8), and the No. 1 slider (17) is fitted inside the No. 1 slide groove (16). An upper connecting ear (4) is extended from the upper end of the bearing cap (3), and a No. 2 slide groove (18) is provided on the other side of the connecting frame (14). A guide frame (19) is fixedly installed on the upper end of the upper cap (20), and the end of the guide frame (19) is fitted inside the No. 2 slide groove (18).

2. A height adjustable shock absorber according to claim 1, characterized in that: The lower end of the adjusting column (11) is coaxially provided with a groove (30), the inner top surface of the groove (30) is coaxially provided with a sliding hole (28), and a limiting column (29) is fixedly installed at the center position of the inner bottom surface of the piston (9), the limiting column (29) passes through the interior of the groove (30), and the upper end of the limiting column (29) is fitted into the interior of the sliding hole (28).

3. A height adjustable shock absorber according to claim 2, characterized in that: A return spring (31) is wound around the outer side of the limiting column (29), the lower end of the return spring (31) is fixed to the inner bottom surface of the piston (9), the upper end of the return spring (31) is fixed to the inner top surface of the groove (30), and a No. 2 connecting shaft (37) is embedded through the upper end of the H-shaped push frame (38), and a No. 2 lug (35) is rotatably mounted in the middle of the outer surface of the No. 2 connecting shaft (37), and the end of the No. 2 lug (35) is fixed to the adjustment column (11).

4. A height adjustable shock absorber according to claim 3, characterized in that: A No. 1 connecting shaft (36) is embedded in the lower end of the H-shaped push frame (38), and a No. 1 lug (34) is rotatably mounted in the middle of the outer surface of the No. 1 connecting shaft (36). The end of the No. 1 lug (34) is fixed to the sealing lug (33). Two guide grooves (32) are symmetrically formed inside the piston (9), and the guide grooves (32) extend to the inner wall of the oil hole (10). The sealing lug (33) is tightly attached to the inside of the guide groove (32).

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