Shock absorber piston and shock absorber

Abstract

The utility model provides a shock absorber piston and a shock absorber, and particularly relates to the field of shock absorbers. The shock absorber piston comprises a piston rod, a piston valve system, a first nut and a second nut, a stopping part is arranged on the piston rod, and external threads are arranged at the end, away from the stopping part, of the piston rod. The piston valve system is sleeved on the piston rod; the first nut is arranged on the side, away from the stop part, of the piston valve system and connected with the external thread so that the piston valve system can be fixed to the piston rod in the axial direction. The second nut is arranged on the side, away from the piston valve system, of the first nut and connected with the outer threads. An eccentric action part is arranged between the first nut and the second nut, and in the process that the second nut is screwed to abut against the first nut, the first nut and the second nut extrude each other in the radial direction through the eccentric action part, so that radial anti-loosening pre-tightening force is generated between the first nut and the external thread as well as between the second nut and the external thread, and the locking function with the piston rod is enhanced; the nut is prevented from loosening, and the reliability and stability of the shock absorber piston are improved.

Description

Technical Field

[0001] The utility model relates to the field of shock absorbers, in particular to a shock absorber piston and a shock absorber. Background Art

[0002] In order to quickly attenuate the vibration of the frame and body and improve the smoothness and comfort of the car's driving, shock absorbers are generally installed on the car's suspension system. The shock absorber is mainly used to suppress the shock when the spring rebounds after absorbing the shock and the impact from the road surface. In this process, the shock absorber realizes energy conversion through the reciprocating motion of the oil in the piston. In the prior art, the shock absorber piston is locked by a nut. With the development of electric vehicles, the weight of cars is getting heavier. The single nut locking process is prone to the nut loosening due to excessive load during use. Utility Model Content

[0003] In view of the above shortcomings of the prior art, the utility model provides a shock absorber piston and a shock absorber to enhance the locking strength of the shock absorber piston and reduce the risk of the nut loosening.

[0004] In order to achieve the above-mentioned purpose and other related purposes, the utility model provides a shock absorber piston, which includes a piston rod, a piston valve system, a first nut and a second nut. A stopper is provided on the piston rod, and an external thread is provided on the end of the piston rod away from the stopper; the piston valve system is sleeved on the piston rod; the first nut is provided on the side of the piston valve system away from the stopper, and is connected to the external thread to fix the piston valve system on the piston rod in the axial direction; the second nut is provided on the side of the first nut away from the piston valve system, and is connected to the external thread; wherein an eccentric action portion is provided between the first nut and the second nut, and in the process of the second nut being screwed to abut against the first nut, the first nut and the second nut are radially squeezed against each other through the eccentric action portion.

[0005] In one example of the utility model, the eccentric action portion includes a rotating groove and a rotating boss which abut against each other in the circumferential direction, the rotating groove is arranged on one of the first nut and the second nut, and the rotating boss is arranged on the other of the first nut and the second nut; at least one of the rotating boss and the rotating groove is eccentrically arranged with respect to the external thread so that the rotating boss and the rotating groove are radially squeezed against each other during the process of the second nut being screwed against the first nut.

[0006] In an example of the present invention, the revolving boss is conical, and the revolving groove matches the shape of the revolving boss.

[0007] In one example of the utility model, the rotary groove is arranged on the first nut, the rotary boss is arranged on the second nut, the thickness h1 of the first nut is 5 to 7 mm, the thickness h2 of the threaded portion of the first nut is 2 to 4 mm; the thickness h3 of the second nut is 5 to 7 mm.

[0008] In one example of the utility model, the piston valve system includes a first valve plate group, a piston body and a second valve plate group. The first valve plate group, the piston body and the second valve plate group are sequentially mounted on the side of the stop portion facing the external thread along the axial direction of the piston rod.

[0009] In an example of the present invention, the piston valve system further includes a first gasket and a second gasket, the first gasket is arranged between the stopper and the first valve plate group, and the second gasket is arranged between the second valve plate group and the first nut.

[0010] In one example of the utility model, the piston body is an integral piston, and the piston body includes a first shell and a second shell that are arranged opposite to each other. The first shell is arranged on a side close to the first valve plate group, and the second shell is arranged on a side close to the second valve plate group. The first shell is fixedly connected to the second shell.

[0011] In an example of the present invention, the first gasket, the first valve plate group and the first housing constitute a compression valve system, and the compression valve system is provided with a first damping channel.

[0012] In an example of the present invention, the second housing, the second valve plate group and the second gasket form a restoring valve system, and the restoring valve system is provided with a second damping channel.

[0013] The utility model also provides a shock absorber, comprising a cylinder body and the shock absorber piston, wherein the shock absorber piston is slidably connected to the cylinder body, and the shock absorber piston reciprocates in the cylinder body along the axial direction of the cylinder body.

[0014] The utility model provides a shock absorber piston, a piston rod is provided with a stop portion, and an end of the piston rod away from the stop portion is provided with an external thread, the piston valve system is sleeved on the piston rod, the first nut and the second nut are sequentially arranged on the side of the piston valve system away from the stop portion and are threadedly connected with the external thread, an eccentric action portion is provided between the first nut and the second nut, and in the process of the second nut being screwed to abut against the first nut, the first nut and the second nut are radially squeezed against each other through the eccentric action portion, so that a radial anti-loosening pre-tightening force is generated between the first nut and the second nut and the external thread, thereby enhancing the locking function with the piston rod, preventing the nut from loosening, and improving the reliability and stability of the shock absorber piston. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 Structural schematic diagram of the shock absorber piston of the present invention in an embodiment;

[0017] Figure 2 Exploded structural schematic diagram of the shock absorber piston of the present invention in an embodiment;

[0018] Figure 3 Structural schematic diagram of the first nut of the shock absorber piston of the present invention in an embodiment;

[0019] Figure 4 Top view of the first nut of the shock absorber piston of the present invention in an embodiment;

[0020] Figure 5 For Figure 4 Cross-sectional structural schematic diagram of the first nut after being cut along the A-A cutting line;

[0021] Figure 6 Structural schematic diagram of the second nut of the shock absorber piston of the present invention in an embodiment;

[0022] Figure 7 Top view of the second nut of the shock absorber piston of the present invention in an embodiment;

[0023] Figure 8 For Figure 7 Cross-sectional structural schematic diagram of the second nut after being cut along the B-B cutting line.

[0024] Element reference numeral description

[0025] 100, piston rod; 110, stop portion; 200, piston valve system; 210, first valve plate group; 220, piston body; 221, first housing; 222, second housing; 230, second valve plate group; 240, first washer; 250, second washer; 300, first nut; 310, rotary groove; 400, second nut; 410, rotary boss. Detailed implementation manners

[0026] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand the other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other. It should also be understood that the terms used in the embodiments of the present invention are for describing specific implementation manners and are not intended to limit the protection scope of the present invention. The test methods without specific conditions noted in the following embodiments are generally carried out under conventional conditions or according to the conditions recommended by each manufacturer.

[0027] It should be noted that the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of clear narration and are not intended to limit the scope of implementation of the present invention. The change or adjustment of their relative relationship, without substantial change in the technical content, should also be regarded as the scope of implementation of the present invention.

[0028] Please refer to Figures 1 to 8 , the present invention provides a shock absorber piston, which includes a piston rod 100, a piston valve system 200, a first nut 300 and a second nut 400. A stop portion 110 is provided on the piston rod 100, and an external thread is provided at one end of the piston rod 100 away from the stop portion 110; the piston valve system 200 is sleeved on the piston rod 100; the first nut 300 is arranged on the side of the piston valve system 200 away from the stop portion 110 and is connected to the external thread to axially fix the piston valve system 200 on the piston rod 100; the second nut 400 is arranged on the side of the first nut 300 away from the piston valve system 200 and is connected to the external thread. There is an eccentric action portion between the first nut 300 and the second nut 400. During the process of screwing the second nut 400 until it abuts against the first nut 300, the first nut 300 and the second nut 400 are radially squeezed against each other through the eccentric action portion, so as to generate a radial anti-loosening pre-tightening force between the first nut 300 and the second nut 400 and the external thread, thereby enhancing the locking function with the piston rod 100, preventing the nut from loosening, and improving the reliability and stability of the shock absorber piston.

[0029] Please refer to Figures 3 to 8, in one embodiment, the eccentric acting portion includes a rotary groove 310 and a rotary boss 410 that abut against each other circumferentially. The rotary groove 310 is provided on one of the first nut 300 and the second nut 400, and the rotary boss 410 is provided on the other of the first nut 300 and the second nut 400; at least one of the rotary boss 410 and the rotary groove 310 is eccentrically arranged with respect to the external thread, so that the rotary boss 410 and the rotary groove 310 are radially pressed against each other during the process of screwing the second nut 400 against the first nut 300. In this embodiment, the rotary groove 310 is provided on the first nut 300, the rotary protrusion is provided on the second nut 400, the rotary boss 410 is eccentrically arranged with respect to the external thread, and the rotary groove 310 is coaxially arranged with the external thread.

[0030] As long as it can be screwed and can generate a radial pressing force, the settings of the rotary boss 410 and the rotary groove 310 can also be in various forms. For example, the rotary groove 310 is provided on the first nut 300, the rotary boss 410 is provided on the second nut 400, the rotary groove 310 is eccentrically arranged with respect to the external thread, and the rotary boss 410 is coaxially arranged with the external thread; or, the rotary groove 310 is provided on the second nut 400, the rotary boss 410 is provided on the first nut 300, the rotary groove 310 is eccentrically arranged with respect to the external thread, and the rotary boss 410 is coaxially arranged with the external thread; or, the rotary groove 310 is provided on the second nut 400, the rotary boss 410 is provided on the first nut 300, the rotary boss 410 is eccentrically arranged with respect to the external thread, and the rotary groove 310 is coaxially arranged with the external thread; or, the rotary groove 310 is provided on the first nut 300, the rotary boss 410 is provided on the second nut 400, and both the rotary groove 310 and the rotary boss 410 are eccentrically arranged with respect to the external thread; or, the rotary groove 310 is provided on the second nut 400, the rotary boss 410 is provided on the first nut 300, and both the rotary groove 310 and the rotary boss 410 are eccentrically arranged with respect to the external thread.

[0031] Please refer to Figures 3 to 8 , in one embodiment, the rotary boss 410 is conical, the small end face of the rotary boss 410 faces the first nut 300, and the rotary groove 310 on the first nut 300 is an inverted conical shape corresponding to the rotary boss 410. During the tightening process of the second nut 400, a wedge-shaped extrusion is formed between the rotary boss 410 and the rotary groove 310. The wedge-shaped extrusion can provide better self-locking characteristics and stress distribution, and has the effects of high load-bearing capacity and preventing loosening. In this application, the thickness h1 of the first nut 300 is 5 - 7 mm, such as 5 mm, 6 mm or 7 mm; the thickness h2 of the threaded portion of the first nut 300 is 2 - 4 mm, such as 2 mm, 3 mm or 4 mm; the thickness h3 of the second nut 400 is 5 - 7 mm, such as 5 mm, 6 mm or 7 mm, and the threaded length of the second nut 400 is a through thread.

[0032] Please refer to Figure 1 and Figure 2 In one embodiment, the piston valve system 200 includes a first valve plate group 210, a piston body 220, and a second valve plate group 230. The first valve plate group 210, the piston body 220, and the second valve plate group 230 are sequentially sleeved on the side of the stop portion 110 facing the external thread along the axial direction of the piston rod 100. Further, the piston valve system 200 further includes a first washer 240 and a second washer 250. The first washer 240 is disposed between the stop portion 110 and the first valve plate group 210, and the second washer 250 is disposed between the second valve plate group 230 and the first nut 300. The first washer 240 can provide buffering for the first valve plate group 210, reducing the impact of the stop portion 110 of the piston rod 100 on the first valve plate group 210. The second washer 250 can provide buffering for the second valve plate group 230, reducing the impact of the first nut 300 on the second valve plate group 230. The first washer 240 and the second washer 250 can also evenly distribute the load, reduce stress concentration, isolate vibration, enhance structural stability, and improve the service life of the piston.

[0033] Please refer to Figure 1 and Figure 2 In one embodiment, the piston body 220 is an integral piston. The piston body 220 includes a first housing 221 and a second housing 222 that are oppositely arranged. The first housing 221 is disposed on the side close to the first valve plate group 210, and the second housing 222 is disposed on the side close to the second valve plate group 230. The first housing 221 and the second housing 222 are fixedly connected. Exemplarily, the first housing 221 and the second housing 222 are fixedly connected by press-fitting.

[0034] In this embodiment, the first washer 240, the first valve plate group 210, and the first housing 221 form a compression valve system, and a first damping channel is provided on the compression valve system; the second housing 222, the second valve plate group 230, and the second washer 250 form a rebound valve system, and a second damping channel is provided on the rebound valve system. The first damping channel can provide a compression damping force for the shock absorber, helping to slow down the compression speed of the shock absorber piston and providing a smooth compression performance. The second damping channel can provide a rebound damping force for the shock absorber, helping to slow down the rebound speed of the shock absorber piston. The piston body 220 is selected as an integral piston, and its first housing 221 and second housing 222 are press-fitted together, which can provide a larger adjustment range of compression damping force for the shock absorber and the force value is stable.

[0035] The present utility model further provides a shock absorber, including a cylinder block and the above-mentioned shock absorber piston. The shock absorber piston is slidably connected to the cylinder block, and the shock absorber piston reciprocates axially in the cylinder block.

[0036] The shock absorber piston provided by the utility model has a stopper portion on the piston rod, and an external thread is provided at one end of the piston rod away from the stopper portion, the piston valve system is sleeved on the piston rod, the first nut and the second nut are sequentially arranged on the side of the piston valve system away from the stopper portion and are threadedly connected with the external thread, an eccentric action portion is provided between the first nut and the second nut, and in the process of the second nut being screwed to abut against the first nut, the first nut and the second nut are radially squeezed against each other through the eccentric action portion, so that a radial anti-loosening pre-tightening force is generated between the first nut and the second nut and the external thread, thereby enhancing the locking function with the piston rod, preventing the nut from loosening, and improving the reliability and stability of the shock absorber piston. Therefore, the utility model effectively overcomes some practical problems in the prior art and has a high utilization value and use significance.

[0037] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A shock absorber piston, characterized in that: include: A piston rod, on which a stopper is provided, and an end of the piston rod facing away from the stopper is provided with an external thread; A piston valve system, mounted on the piston rod; A first nut, disposed on a side of the piston valve system away from the stopper and connected to the external thread to fix the piston valve system on the piston rod in the axial direction; A second nut, disposed on a side of the first nut away from the piston valve system and connected to the external thread; An eccentric action portion is provided between the first nut and the second nut. When the second nut is screwed to abut against the first nut, the first nut and the second nut are radially squeezed against each other by the eccentric action portion.

2. The shock absorber piston according to claim 1, characterized in that: The eccentric action portion includes a rotating groove and a rotating boss which abut against each other in the circumferential direction, the rotating groove is arranged on one of the first nut and the second nut, and the rotating boss is arranged on the other of the first nut and the second nut; at least one of the rotating boss and the rotating groove is eccentrically arranged with respect to the external thread so that the rotating boss and the rotating groove are radially squeezed against each other during the process of the second nut being screwed against the first nut.

3. The shock absorber piston according to claim 2, characterized in that: The revolving boss is conical, and the revolving groove matches the shape of the revolving boss.

4. The shock absorber piston according to claim 2, characterized in that: The revolving groove is arranged on the first nut, and the revolving boss is arranged on the second nut. The thickness h1 of the first nut is 5-7 mm, and the thickness h2 of the threaded portion of the first nut is 2-4 mm; the thickness h3 of the second nut is 5-7 mm.

5. The shock absorber piston according to claim 1, characterized in that: The piston valve system comprises a first valve plate group, a piston body and a second valve plate group. The first valve plate group, the piston body and the second valve plate group are sequentially sleeved on a side of the stopper facing the external thread along the axial direction of the piston rod.

6. The shock absorber piston according to claim 5, characterized in that The piston valve system further includes a first gasket and a second gasket, wherein the first gasket is arranged between the stopper and the first valve plate group, and the second gasket is arranged between the second valve plate group and the first nut.

7. The shock absorber piston according to claim 6, characterized in that The piston body is an integral piston, and includes a first shell and a second shell that are arranged opposite to each other. The first shell is arranged on a side close to the first valve plate group, and the second shell is arranged on a side close to the second valve plate group. The first shell is fixedly connected to the second shell.

8. The shock absorber piston according to claim 7, characterized in that The first gasket, the first valve plate group and the first housing form a compression valve system, and the compression valve system is provided with a first damping channel.

9. The shock absorber piston according to claim 7, characterized in that: The second housing, the second valve plate group and the second gasket form a restoring valve system, and the restoring valve system is provided with a second damping channel.

10. A shock absorber, characterized in that: The invention comprises a cylinder body and the shock absorber piston according to any one of claims 1 to 9, wherein the shock absorber piston is slidably connected to the cylinder body, and the shock absorber piston reciprocates in the cylinder body along the axial direction of the cylinder body.

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