Shock absorber with a stable structure

Abstract

The utility model discloses a structure stable shock absorber, including sleeve assembly and piston rod, sleeve assembly includes inner tube and outer tube, and the oil storage cavity is formed between inner tube and outer tube, and the one end of piston rod is connected with piston subassembly and is inserted into inner tube, is equipped with support step on piston rod, and the outer periphery of piston rod is connected with the locking ring for the piston subassembly pressure tightly on support step through multiple locking assemblies, and locking assembly includes adjusting screw, locking marble and reset spring, and the plurality of screw holes are equipped with in locking ring circumferential side, and the locking recess is equipped with in piston rod side part, and locking marble sets up in screw hole, and adjusting screw is cooperated with screw hole thread, when the tightening adjusting screw, adjusting screw acts on locking marble and makes its inner end insert into locking recess, when the loosening adjusting screw, reset spring acts on locking marble and makes its inner end separate from locking recess. The utility model piston subassembly mounting structure is stable and reliable, and also will not be loose after long -term use, can guarantee shock absorber reliable damping performance.

Description

Technical Field

[0001] This utility model relates to the field of vibration damper technology, and more specifically to a vibration damper with stable structure. Background Technology

[0002] Shock absorbers—as the name suggests—are devices that reduce vibrations. Their main function is to absorb irregular vibrations from the road surface onto the vehicle body. Through the damping effect of the internal hydraulic fluid, mechanical energy is converted into heat energy, which is then dissipated into the atmosphere through the oil reservoir shell, resulting in good ride comfort and smooth driving. Since their introduction in the early 1930s, using a hydraulic cylinder structure, their basic principle has remained largely unchanged. The technical requirements for shock absorbers are driven by the ever-increasing demands for ride comfort, reliability, and lifespan in vehicles.

[0003] Chinese utility model patent application number CN201620713845.X discloses a multi-stage vibration damper, which includes a sleeve assembly and a piston rod. The sleeve assembly includes an inner tube and an outer tube, with an oil reservoir formed between them. One end of the piston rod extends into the inner tube, opposite the bottom of the inner tube. A piston sub-assembly is installed on the extended end of the piston rod and fixedly connected by a positioning nut. An outer limiting sleeve is connected to the other end of the piston rod. A guide and an oil seal are provided on the end of the piston rod near the outer limiting sleeve. A bottom valve assembly and a bottom cover are installed at the bottom of the inner tube. In this structure, the piston sub-assembly is fixedly connected to the piston rod by the positioning nut. After long-term use, under the combined action of vibration and hydraulic pressure, the positioning nut is at risk of loosening, which may cause the valve plate on the piston sub-assembly to fail to effectively close the flow hole, thus leading to the failure of the vibration damper.

[0004] Therefore, it is necessary to improve the fixing method of the piston sub-assembly in the existing shock absorber. Utility Model Content

[0005] The purpose of this invention is to provide a shock absorber with a stable structure. The piston sub-assembly of this invention has a stable and reliable installation structure and will not loosen after long-term use, thus ensuring the reliable damping performance of the shock absorber.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a structurally stable vibration damper, comprising a sleeve assembly and a piston rod. The sleeve assembly includes an inner tube and an outer tube, with an oil reservoir formed between the inner and outer tubes. One end of the piston rod extends into the inner tube, opposite the bottom of the inner tube. A piston sub-assembly is installed at the extended end of the piston rod. A guide assembly and a bottom valve sub-assembly are respectively provided between the inner and outer tubes at both ends. A support step is provided on the piston rod, and the outer periphery of the piston rod is connected by multiple sets of locking assemblies for securing the piston sub-assembly. A locking ring is pressed against the support step. The locking assembly includes an adjusting screw, a locking pin, and a return spring. The locking ring has a plurality of screw holes on its circumference, the number of which is equal to the number of the locking assembly. The piston rod has a locking recess on its side. The locking pin is movably disposed in the corresponding screw hole. The adjusting screw is threaded into the screw hole. When the adjusting screw is tightened, it acts on the locking pin, causing its inner end to insert into the locking recess. When the adjusting screw is loosened, the return spring acts on the locking pin, causing its inner end to disengage from the locking recess.

[0007] By adopting the above solution, a locking ring is used to press the piston sub-assembly. The locking ring, through multiple radially screwed-in adjusting screws, presses the locking tumbler into the locking recess on the side of the piston rod, achieving a locking connection between the locking ring and the piston rod. When the damper is working, the adjusting screws are almost unaffected by axial force and will not loosen. Therefore, the locking ring will not loosen either, ensuring a stable and reliable piston sub-assembly installation structure that will not loosen even after long-term use, guaranteeing the damper's reliable vibration damping performance. When the locking ring needs to be removed, simply loosen the adjusting screws; the locking tumbler will automatically disengage from the locking recess under the action of the return spring, releasing the locking ring and allowing it to be removed. The operation is very convenient.

[0008] The present invention is further configured such that when the inner end of the locking pin is located outside the locking recess, the central axis of the locking pin is located below the center plane of the locking recess, and a guide slope is provided at one edge of the opening of the locking recess away from the supporting step for guiding the locking pin into the locking recess.

[0009] By adopting the above scheme, the locking tumbler is inserted into the locking recess under the guidance of the guide slope, which can provide a reverse force to the locking ring, so that the locking ring applies a preload force to the piston sub-assembly, pressing the piston sub-assembly tightly onto the support step, making the installation structure more robust and reliable.

[0010] The present invention is further configured such that the locking recess is an annular groove shape.

[0011] By adopting the above solution, circumferential positioning is not required, and the locking pin on the locking ring and the locking recess on the piston rod can be aligned at any angle, making the installation of the locking ring very convenient.

[0012] The present invention is further configured such that the inner circular surface of the screw hole is provided with a first limiting flange, the outer end of the locking tumbler is provided with a second limiting flange, and the two ends of the reset spring are respectively abutted against the first limiting flange and the second limiting flange.

[0013] By adopting the above scheme, when the locking tumbler moves inward, that is, when the first limiting flange moves toward the direction of the second limiting flange, the return spring is compressed and stores energy. When the adjusting screw moves outward, the return spring releases energy to restore its original state and pushes the locking tumbler to move outward, thereby realizing the inward and outward movement of the locking tumbler.

[0014] The present invention is further provided that the upper end face of the locking ring is provided with a plurality of concentrically arranged O-shaped grooves, and a rubber ring for abutting against the lower end of the piston sub-assembly is embedded in the O-shaped grooves.

[0015] By adopting the above scheme, the locking ring and the piston sub-assembly use a hard contact + soft contact fit, which makes the fit tighter, reduces the likelihood of circumferential relative rotation, and improves structural stability.

[0016] The present invention is further configured such that the piston sub-assembly comprises, from top to bottom, an upper gasket, an upper valve plate, an upper piston body, a lower piston body, a lower valve plate, and a lower gasket. The upper piston body is provided with a first upper hole and a second upper hole, and the lower piston body is provided with a first lower hole and a second lower hole. The first upper hole and the first lower hole are joined together to form a first flow hole, and the second upper hole and the second lower hole are joined together to form a second flow hole. The upper valve plate abuts against the upper end of the first flow hole, and the lower valve plate abuts against the lower end of the second flow hole.

[0017] By adopting the above scheme, which is the specific structure of the piston sub-assembly, when the piston rod drives the piston sub-assembly upward, the lower valve plate deforms and opens the second flow hole, and the oil in the upper chamber enters the lower chamber through the second flow hole, while at this time the first valve plate blocks the first flow hole; when the piston rod drives the piston sub-assembly downward, the upper valve plate deforms and opens the first flow hole, and the oil in the lower chamber enters the upper chamber through the first flow hole, while at this time the second valve plate blocks the second flow hole, thereby realizing bidirectional throttling control during the movement of the piston sub-assembly.

[0018] The present invention is further configured such that: a first annular groove is formed at the upper end of the upper piston body; a first guide ring is interference-fitted in the first annular groove; a first upper annular recess is formed at the upper end of the first guide ring; a first lower annular recess is formed at the lower end of the first guide ring and communicates with a first upper hole; the first upper annular recess and the first lower annular recess are connected by a plurality of first through holes; a second annular groove is formed at the lower end of the lower piston body; a second guide ring is interference-fitted in the second annular groove; a second lower annular recess is formed at the lower end of the second guide ring; a second upper annular recess is formed at the upper end of the second guide ring and communicates with a second lower hole; the second upper annular recess and the second lower annular recess are connected by a plurality of second through holes.

[0019] By adopting the above scheme, the oil at the outlet of the first flow hole and the second flow hole is guided circumferentially by the first guide ring and the second guide ring respectively, so that the hydraulic pressure is evenly applied to all circumferential parts of the upper valve plate and all circumferential parts of the lower valve plate, the upper valve plate and the lower valve plate are subjected to more uniform force, and the service life is longer. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the connection structure between the piston rod and the piston sub-assembly of this utility model; Figure 3 for Figure 2 Enlarged structural diagram of section A in the middle; Figure 4 for Figure 3 A schematic diagram of the structure after the locking tumbler leaves the locking recess.

[0021] In the diagram: 1. Sleeve assembly; 2. Piston rod; 3. Inner tube; 4. Outer tube; 5. Oil reservoir; 6. Piston sub-assembly; 7. Guide assembly; 8. Bottom valve sub-assembly; 9. Support step; 10. Locking assembly; 11. Locking ring; 12. Adjusting screw; 13. Locking tumbler; 14. Return spring; 15. Screw hole; 16. Locking recess; 17. Guide slope; 18. First limiting flange; 19. Second limiting flange; 20. O-ring; 21. Rubber ring; 22. Upper gasket; 23. Upper valve plate; 24. 25. Upper piston body; 26. Lower piston body; 27. Lower valve plate; 28. Lower gasket; 29. ​​First upper hole; 20. Second upper hole; 31. First lower hole; 32. Second lower hole; 33. First flow hole; 34. Second flow hole; 35. First guide ring; 36. First upper annular recess; 37. First lower annular recess; 38. First through hole; 39. Second annular groove; 40. Second guide ring; 41. Second lower annular recess; 42. Second upper annular recess; 43. Second through hole. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Example: As attached Figures 1-4 The illustrated stable vibration damper includes a sleeve assembly 1 and a piston rod 2. The sleeve assembly 1 includes an inner tube 3 and an outer tube 4, with an oil reservoir 5 formed between the inner tube 3 and the outer tube 4. One end of the piston rod 2 extends into the inner tube 3, opposite to the bottom of the inner tube 3. A piston sub-assembly 6 is installed at the end of the piston rod 2. A guide assembly 7 and a bottom valve sub-assembly 8 are respectively provided between the inner tube 3 and the outer tube 4 at both ends. A support step 9 is provided on the piston rod 2. A locking ring 11 for pressing the piston sub-assembly 6 onto the support step 9 is connected to the outer periphery of the piston rod 2 by multiple sets of locking assemblies 10. In this embodiment, the locking assembly 1... The locking components are arranged in four groups, evenly distributed in a circular array. The locking assembly 10 includes an adjusting screw 12, a locking pin, and a return spring 14. The locking ring 11 has multiple screw holes 15 around its periphery, with a number corresponding to the locking assembly 10. The piston rod 2 has a locking recess 16 on its side. The locking pin is movably disposed in the corresponding screw hole 15. The adjusting screw 12 is threaded into the screw hole 15. When the adjusting screw 12 is tightened, it acts on the locking pin, causing its inner end to insert into the locking recess 16. When the adjusting screw 12 is loosened, the return spring 14 acts on the locking pin, causing its inner end to disengage from the locking recess 16. A locking ring 11 is used to press the piston subassembly 6. The locking ring 11, through multiple radially screwed adjusting screws 12, presses the locking ball into the locking recess 16 on the side of the piston rod 2, achieving a locking connection between the locking ring 11 and the piston rod 2. When the damper is working, the adjusting screws 12 are almost unaffected by axial force and will not loosen. Therefore, the locking ring 11 will also not loosen, making the piston subassembly 6 installation structure stable and reliable. Even after long-term use, it will not loosen, ensuring reliable vibration damping performance of the damper. When it is necessary to remove the locking ring 11, simply loosen the adjusting screws 12. The locking ball will automatically disengage from the locking recess 16 under the action of the return spring 14, releasing the locking ring 11 and allowing it to be removed. The operation is very convenient.

[0024] As attached Figure 3 and attached Figure 4As shown, when the inner end of the locking pin is outside the locking recess 16, the central axis of the locking pin is below the center plane of the locking recess 16. An edge of the opening of the locking recess 16 away from the supporting step 9 is provided with a guide slope 17 for guiding the locking pin into the locking recess 16. Guided by the guide slope 17, the locking pin is inserted into the locking recess 16, providing a counterforce to the locking ring 11. This causes the locking ring 11 to apply a preload force to the piston subassembly 6, pressing the piston subassembly 6 firmly onto the supporting step 9, resulting in a more robust and reliable installation structure.

[0025] The locking recess 16 is an annular groove. No circumferential positioning is required; the locking pin on the locking ring 11 can be engaged with the locking recess 16 on the piston rod 2 at any angle, making the installation of the locking ring 11 very convenient.

[0026] As attached Figure 3 As shown, the inner surface of the screw hole 15 is provided with a first limiting flange 18, and the outer end of the locking tumbler is provided with a second limiting flange 19. The two ends of the return spring 14 are respectively abutted against the first limiting flange 18 and the second limiting flange 19. When the locking tumbler moves inward, that is, when the first limiting flange 18 moves toward the direction close to the second limiting flange 19, the return spring 14 is compressed and stores energy. When the adjusting screw 12 moves outward, the return spring 14 releases energy and returns to its original state, pushing the locking tumbler to move outward, thereby realizing the inward and outward movement of the locking tumbler.

[0027] As attached Figure 3 As shown, the upper surface of the locking ring 11 has multiple concentrically arranged O-shaped grooves 20, and rubber rings 21 are embedded in the O-shaped grooves 20 for abutting against the lower end of the piston sub-assembly 6. The locking ring 11 and the piston sub-assembly 6 adopt a hard contact + soft contact engagement method, which makes the fit tighter, reduces the likelihood of circumferential relative rotation, and improves structural stability.

[0028] As attached Figure 2As shown, the piston assembly 6, from top to bottom, includes an upper gasket 22, an upper valve plate 23, an upper piston body 24, a lower piston body 25, a lower valve plate 26, and a lower gasket 27. A sealing ring is provided on the outer periphery of the upper piston body 24 or the lower piston body 25 to form a sealing fit with the inner wall of the inner tube 3. The upper piston body 24 is provided with a first upper hole 28 and a second upper hole 29. The lower piston body 25 is provided with a first lower hole 30 and a second lower hole 31. The first upper hole 28 and the first lower hole 30 are joined to form a first flow hole 32. The second upper hole 29 and the second lower hole 31 are joined to form a second flow hole 33. The upper valve plate 23 abuts against the upper end of the first flow hole 32, and the lower valve plate 26 abuts against the lower end of the second flow hole 33. The specific structure of the piston subassembly 6 is as follows: when the piston rod 2 drives the piston subassembly 6 upward, the lower valve plate 26 deforms and opens the second flow hole 33, and the oil in the upper chamber enters the lower chamber through the second flow hole 33. At this time, the first valve plate blocks the first flow hole 32. When the piston rod 2 drives the piston subassembly 6 downward, the upper valve plate 23 deforms and opens the first flow hole 32, and the oil in the lower chamber enters the upper chamber through the first flow hole 32. At this time, the second valve plate blocks the second flow hole 33, thereby realizing bidirectional throttling control when the piston subassembly 6 moves.

[0029] As attached Figure 2 As shown, the upper piston body 24 has a first annular groove 34 at its upper end, in which a first guide ring 35 is interference-fitted. The upper end of the first guide ring 35 has a first upper annular recess 36, and the lower end of the first guide ring 35 has a first lower annular recess 37 that communicates with the first upper hole 28. The first upper annular recess 36 and the first lower annular recess 37 are connected by a plurality of first through holes 38. The lower piston body 25 has a second annular groove 39 at its lower end, in which a second guide ring 40 is interference-fitted. The lower end of the second guide ring 40 has a second lower annular recess 41, and the upper end of the second guide ring 40 has a second upper annular recess 42 that communicates with the second lower hole 31. The second upper annular recess 42 and the second lower annular recess 41 are connected by a plurality of second through holes 43. The first guide ring 35 and the second guide ring 40 respectively guide the oil at the outlet of the first flow hole 32 and the second flow hole 33 in a circumferential manner, so that the hydraulic pressure is evenly applied to all parts of the upper valve plate 23 and the lower valve plate 26 in a circumferential manner, and the upper valve plate 23 and the lower valve plate 26 are subjected to more uniform force and have a longer service life.

Claims

1. A structurally stable vibration damper, comprising a sleeve assembly (1) and a piston rod (2), wherein the sleeve assembly (1) comprises an inner tube (3) and an outer tube (4), an oil reservoir (5) is formed between the inner tube (3) and the outer tube (4), one end of the piston rod (2) extends into the inner tube (3) and is opposite to the bottom of the inner tube (3), a piston sub-assembly (6) is installed at the end of the piston rod (2), and a guide assembly (7) and a bottom valve sub-assembly (8) are respectively provided between the inner tube (3) and the outer tube (4) at both ends; characterized in that: The piston rod (2) is provided with a support step (9). The outer periphery of the piston rod (2) is connected by multiple sets of locking assemblies (10) to a locking ring (11) for pressing the piston sub-assembly (6) onto the support step (9). The locking assembly (10) includes an adjusting screw (12), a locking ball (13), and a return spring (14). The locking ring (11) is provided with multiple screw holes (15) on its periphery, the number of which is equivalent to that of the locking assembly (10). The side of the piston rod (2) A locking recess (16) is provided, and the locking tumbler (13) is movably disposed in the corresponding screw hole (15). The adjusting screw (12) is threadedly engaged with the screw hole (15). When the adjusting screw (12) is tightened, the adjusting screw (12) acts on the locking tumbler (13) so that its inner end is inserted into the locking recess (16). When the adjusting screw (12) is loosened, the return spring (14) acts on the locking tumbler (13) so that its inner end is disengaged from the locking recess (16).

2. The structurally stable vibration damper according to claim 1, characterized in that: When the inner end of the locking pin (13) is outside the locking recess (16), the central axis of the locking pin (13) is below the center plane of the locking recess (16). The opening of the locking recess (16) is provided with a guide slope (17) on one edge away from the support step (9) for guiding the locking pin (13) into the locking recess (16).

3. A structurally stable vibration damper according to claim 1, characterized in that: The locking recess (16) is an annular groove shape.

4. A structurally stable vibration damper according to claim 1, characterized in that: The inner circular surface of the screw hole (15) is provided with a first limiting flange (18), the outer end of the locking tumbler (13) is provided with a second limiting flange (19), and the two ends of the reset spring (14) are respectively abutted against the first limiting flange (18) and the second limiting flange (19).

5. A structurally stable vibration damper according to claim 1, characterized in that: The upper end face of the locking ring (11) is provided with a plurality of concentrically arranged O-shaped grooves (20), and a rubber ring (21) for abutting against the lower end of the piston sub-assembly (6) is embedded in the O-shaped grooves (20).

6. A structurally stable vibration damper according to claim 1, characterized in that: The piston sub-assembly (6) includes, from top to bottom, an upper gasket (22), an upper valve plate (23), an upper piston body (24), a lower piston body (25), a lower valve plate (26), and a lower gasket (27). The upper piston body (24) is provided with a first upper hole (28) and a second upper hole (29). The lower piston body (25) is provided with a first lower hole (30) and a second lower hole (31). The first upper hole (28) and the first lower hole (30) are joined to form a first flow hole (32). The second upper hole (29) and the second lower hole (31) are joined to form a second flow hole (33). The upper valve plate (23) abuts against the upper end of the first flow hole (32), and the lower valve plate (26) abuts against the lower end of the second flow hole (33).

7. A structurally stable vibration damper according to claim 6, characterized in that: The upper piston body (24) has a first annular groove (34) at its upper end. A first guide ring (35) is interference-fitted in the first annular groove (34). A first upper annular recess (36) is provided at the upper end of the first guide ring (35). A first lower annular recess (37) is provided at the lower end of the first guide ring (35) and communicates with the first upper hole (28). The first upper annular recess (36) and the first lower annular recess (37) are connected by a plurality of first through holes (38). The lower piston body (25) has a second annular groove (39) at its lower end. A second guide ring (40) is interference-fitted into the second annular groove (39). A second lower annular recess (41) is provided at the lower end of the second guide ring (40). A second upper annular recess (42) is provided at the upper end of the second guide ring (40) and communicates with the second lower hole (31). The second upper annular recess (42) and the second lower annular recess (41) are connected by a plurality of second through holes (43).

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