Shock absorber piston and shock absorber

Abstract

The utility model relates to the technical field of vehicle shock absorbers, in particular to a shock absorber piston and a shock absorber. The shock absorber piston comprises a piston body, a plurality of damping holes penetrating through the piston body in the axial direction are formed in the piston body, and a plurality of concave parts are arranged on the inner walls of the damping holes. When damping oil liquid of the damper passes through the damping hole, the structure of the concave part can break a boundary layer between the oil liquid and the surface of the damping hole, so that the oil flow forms tiny turbulent flow at the concave part, and the overall flow resistance is reduced. Due to the concave part in the damping hole, oil liquid is easier to desorb when passing through the damping hole instead of being tightly attached to the surface of the damping hole, so that the oil liquid is more agile during high-frequency response, the reaction speed of the shock absorber is increased, and the lag feeling of the shock absorber is reduced. Particularly on a continuously fluctuating road surface or a high-speed cross-country process, the oil response speed of the shock absorber is high, the driving stability and controllability are improved, and the driving comfort is improved.

Description

Technical Field

[0001] This utility model relates to the field of vehicle shock absorber technology, specifically to a shock absorber piston and a shock absorber. Background Technology

[0002] A vehicle shock absorber consists of a piston rod inserted into a cylinder filled with damping oil. The piston has damping holes that allow the oil in the two compartments separated by the piston to replenish each other. The shock absorber works by the piston moving up and down, causing the oil in the shock absorber chambers to repeatedly flow from one chamber through the damping holes to the other. The friction between the hole walls and the oil, as well as the internal friction between oil molecules, creates a damping force, converting the energy of the vehicle's vibrations into heat energy in the oil, which is then absorbed and dissipated into the atmosphere. To increase comfort and safety, shock absorbers are now installed on motorcycles, electric bikes, and bicycles to absorb vibrations when encountering uneven terrain.

[0003] While existing shock absorbers effectively reduce vibrations and improve driving comfort, they also present some problems during use. In existing shock absorbers, the inner wall of the piston's damping orifice is flat. Because the damping oil inside the shock absorber is a viscous fluid, when the oil passes through the piston's damping orifice, the oil molecules near the orifice wall form a nearly static boundary layer due to viscous resistance. This results in strong adhesion between the oil and the damping orifice, leading to a slow response when the oil changes direction or speed during compression and rebound. This is especially noticeable on undulating roads or at high speeds, where the shock absorber tends to exhibit significant lag, reducing driving comfort. Utility Model Content

[0004] To address the aforementioned deficiencies, the present invention aims to provide a shock absorber piston and a shock absorber, wherein the piston can reduce the adhesion resistance of the oil through the damping orifice of the piston, thereby improving the response speed of the oil and reducing the hysteresis of the shock absorber.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0006] In a first aspect, a shock absorber piston is provided, including a piston body, wherein a plurality of damping holes are provided on the piston body and the inner wall of the damping holes is provided with a plurality of recesses.

[0007] By adopting the above solution, the presence of several recesses within the damping orifice allows the damping oil to break the boundary layer between the oil and the orifice surface as it passes through, creating micro-turbulence and reducing overall flow resistance. The recesses also facilitate oil detachment from the orifice surface, resulting in a more agile high-frequency response, improved shock absorber responsiveness, and reduced hysteresis. This is particularly beneficial on undulating surfaces or during high-speed off-road driving, enhancing driving stability, controllability, and comfort.

[0008] Preferably, a plurality of the recesses are evenly distributed on the inner wall of the corresponding damping holes.

[0009] Preferably, the inner wall of the recess is spherical. A spherical inner wall facilitates the formation of minute turbulence when oil passes through the recess.

[0010] Preferably, the edges of the recess are chamfered.

[0011] Preferably, the damping holes are evenly distributed on the piston body along the circumferential direction.

[0012] Preferably, a notch is provided at one end of the damping orifice, the notch being located at the edge of the outer circumference of the piston body, and the notches of adjacent damping orifices are staggered at the upper and lower ends of the piston body. The notch facilitates the formation of an oil passage for fluid supply in the shock absorber.

[0013] Preferably, the damping orifice has six holes.

[0014] Preferably, the piston body has a mounting hole in the middle.

[0015] Preferably, the piston body has a mounting groove along its outer circumference. This mounting groove allows for easy installation of the piston's wear ring.

[0016] Secondly, a shock absorber is provided, including the aforementioned shock absorber piston.

[0017] In summary, the shock absorber piston provided by this utility model has at least the following beneficial effects:

[0018] 1. Improved the oil response speed of the shock absorber and reduced the hysteresis of the shock absorber.

[0019] 2. Improved driving comfort. Attached image description:

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without any novel effort.

[0021] Figure 1 This is a three-dimensional structural diagram of Embodiment 1 of this utility model from a top view.

[0022] Figure 2 This is a three-dimensional structural diagram of Embodiment 1 of this utility model from a downward viewing angle;

[0023] Figure 3 This is a front view of Embodiment 1 of this utility model;

[0024] Figure 4 This is a schematic diagram of the structure of Embodiment 1 of this utility model in use.

[0025] The reference numerals in the attached drawings include: piston body 1, damping hole 2, recess 3, notch 4, mounting hole 5, mounting groove 6, valve seat 7, elastic element 8, valve plate 9, wear ring 10, upper chamber 11, and lower chamber 12. Detailed Implementation

[0026] To enable those skilled in the art to better understand the technical solution of this utility model, the following description is provided in conjunction with the appendix. Figure 1-4 The present invention will be further described in detail below with reference to specific embodiments.

[0027] Example 1

[0028] Please see Figure 1-4 This embodiment provides a shock absorber piston, including a piston body 1. The piston body 1 has several damping holes 2 that axially penetrate the piston body 1. The damping holes 2 are evenly distributed circumferentially on the piston body 1; in this embodiment, six damping holes 2 are preferably provided. A mounting hole 5 is provided in the middle of the piston body 1 for mounting a piston rod. A mounting groove 6 is provided circumferentially on the outer circumference of the piston body 1 for mounting a wear-resistant ring 10.

[0029] A notch 4 is provided at one end of the damping orifice 2. The notch 4 is located at the edge of the outer circumference of the piston body 1, and the notches 4 of adjacent damping orifices 2 are staggered at the upper and lower ends of the piston body 1. Specifically, notches 4 are provided at the upper ends of three damping orifices 2, and notches 4 are provided at the lower ends of the other three damping orifices 2. The damping orifices 2 with notches 4 at the upper and lower ends are arranged alternately.

[0030] The inner wall of the damping orifice 2 is provided with a plurality of recesses 3, which are evenly distributed on the inner wall of the corresponding damping orifice 2. In this embodiment, preferably, the inner wall of the recesses 3 is a spherical surface, and the edges of the recesses 3 are chamfered, that is, the junction of the recesses 3 and the damping orifice 2 is chamfered, so that a smooth transition is formed between the damping orifice 2 and the recesses 3, which facilitates the flow of oil into the recesses 3. The damping orifice 2 is an arc-shaped orifice, and the cross-section of the damping orifice 2 is arc-shaped and strip-shaped.

[0031] By adopting the above scheme, during use, because the damping orifice 2 is provided with several recesses 3, when the damping oil of the shock absorber passes through the damping orifice 2, the structure of the recesses 3 can break the boundary layer between the oil and the surface of the damping orifice 2, so that the oil flow forms micro-turbulence within the recesses 3, thereby reducing the overall flow resistance. The recesses 3 within the damping orifice 2 make it easier for the oil to detach when passing through the damping orifice 2, rather than sticking tightly to the surface of the damping orifice 2, thus making the oil more agile at high frequencies, improving the shock absorber's response speed, and reducing the shock absorber's hysteresis. Especially on continuously undulating roads or during high-speed off-road driving, the shock absorber's oil response speed is fast, improving driving stability and controllability, and improving driving comfort. In addition, the micro-turbulence formed by the oil in the recesses 3 helps to increase the heat exchange surface area of ​​the oil, which is beneficial for heat dissipation.

[0032] Example 2

[0033] Based on the same inventive concept, this embodiment provides a shock absorber, including the shock absorber piston described above. Please refer to... Figure 4 During operation, the piston body 1 separates the upper chamber 11 and the lower chamber 12 within the shock absorber. The piston is mounted on a valve seat 7, the upper section of which is provided with a valve plate 9 and an elastic element 8. The valve plate 9 is held against the upper end of the piston body 1 by the elastic element 8, which can be an elastic element such as an elastic sheet or spring as in the prior art. The valve plate 9 blocks three damping holes 2 located at the upper end of the piston body 1 that do not have notches 4. When the piston body 1 moves axially toward the upper chamber 11, the valve plate 9 at the upper end of the piston body 1 blocks the damping holes 2 without notches 4, and the oil in the upper chamber 11 enters the damping holes 2 through the three damping holes 2 with notches 4 at the upper end, thereby entering the lower chamber 12. As the piston body 1 moves axially toward the lower chamber 12, the valve plate 9 at the upper end of the piston body 1 moves away from the piston body 1 under the pressure of the oil in the lower chamber 12. This opens the three damping holes 2 that were blocked by the valve plate 9 at the upper end of the piston body 1, allowing oil to pass through all six damping holes 2. The opening and closing of the damping holes 2 by the valve plate 9 forms a one-way valve structure.

[0034] It should be noted that words indicating direction in this article, such as "up" and "down," are all in the format of "upper" and "lower." Figure 1The direction setting is for ease of description only and has no other specific meaning.

[0035] It should also be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or apparatus comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or apparatus that includes the aforementioned element.

[0036] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A shock absorber piston characterized by, The piston body (1) is provided with a plurality of damping holes (2) penetrating the piston body (1) in the axial direction, and the inner wall of the damping hole (2) is provided with a plurality of recesses (3).

2. A shock absorber piston according to claim 1, wherein The plurality of recesses (3) are uniformly distributed on the inner wall of the corresponding damping hole (2).

3. A shock absorver piston according to claim 1 wherein, The inner wall of the recess (3) is a spherical surface.

4. A shock absorber piston according to claim 3, wherein The edge of the recess (3) is provided with a chamfer.

5. A shock absorver piston according to claim 1 wherein, The damping holes (2) are uniformly distributed on the piston body (1) in the circumferential direction.

6. A shock absorber piston according to any one of claims 1-5, characterized in that The orifice of one end of the damping hole (2) is provided with a notch (4), the notch (4) is provided at the edge of the outer circumference of the piston body (1), and the notches (4) of adjacent damping holes (2) are arranged staggered at the upper and lower ends of the piston body (1).

7. A shock absorber piston according to claim 6, wherein The damping hole (2) is provided with six.

8. A shock absorver piston according to claim 1 wherein, The middle part of the piston body (1) is provided with a mounting hole (5).

9. A shock absorver piston according to claim 1 wherein, The outer circumference of the piston body (1) is provided with a mounting groove (6) in the circumferential direction.

10. A shock absorber characterized by The shock absorber piston comprises the shock absorber piston according to any one of claims 1-9.

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