CN220910324U - Floating piston for shock absorber, suspension system and vehicle - Google Patents

Abstract

Embodiments of the present application provide a floating piston for a shock absorber, a suspension system, and a vehicle. The floating piston includes: the piston comprises a piston body, wherein an annular groove is formed in the side face of the piston body, a first groove bottom and a second groove bottom are formed in the annular groove, the second groove bottom is positioned in the first groove bottom, and the depth of the second groove bottom is larger than that of the first groove bottom along the radial direction of the piston body so that a step surface is formed between the second groove bottom and the first groove bottom; the elastic sealing ring is embedded in a groove formed by the step surface and the second groove bottom; the piston ring is sleeved in the annular groove, and the inner surface of the piston ring is in interference fit with the first groove bottom and the elastic sealing ring.

Description

Floating piston for shock absorber, suspension system and vehicle

Technical Field

The utility model relates to the technical field of automobiles, in particular to a floating piston for a shock absorber, the shock absorber, a suspension system and a vehicle.

Background

Shock absorbers are suspension system instruments for vehicles that provide protection and shock absorption for the vehicle. In the shock absorber, a piston member is required to buffer the impact and convert kinetic energy into internal energy of a piston and a cylinder.

With the gradual increase of the requirements of the market on the damping performance of the vehicle, the performance reliability of the damping device is also required to be improved and improved correspondingly. In some shock absorbers it is necessary to use sealing pistons to completely separate the cylinders on both sides of the piston, while in operation it is also necessary to ensure good performance of the movement in the cylinders, which gives good sensitivity to movements.

At present, the sealing reliability between the sealing piston and the cylinder body is limited, the sealing piston cannot bear higher pressure impact, and the condition that the cylinder bodies on two sides of the sealing piston are conducted intermittently possibly occurs. This phenomenon can affect the performance of the shock absorber. On the other hand, the structural reliability of such pistons also needs to be improved to ensure their performance stability over long-term use.

Accordingly, there is a need for improvements over existing shock absorbers.

Disclosure of utility model

It is an object of the present utility model to provide a new solution for a floating piston of a shock absorber.

According to a first aspect of the present utility model there is provided a floating piston comprising:

The piston comprises a piston body, wherein an annular groove is formed in the side face of the piston body, a first groove bottom and a second groove bottom are formed in the annular groove, the second groove bottom is positioned in the first groove bottom, and the depth of the second groove bottom is larger than that of the first groove bottom along the radial direction of the piston body so that a step surface is formed between the second groove bottom and the first groove bottom;

The elastic sealing ring is embedded in a groove formed by the step surface and the second groove bottom;

the piston ring is sleeved in the annular groove, and the inner surface of the piston ring is in interference fit with the first groove bottom and the elastic sealing ring.

Optionally, the thickness of the elastic sealing ring is greater than the height of the step surface between the second groove bottom and the first groove bottom.

Optionally, along the radial direction of the piston body, the outer surface of the piston ring protrudes out of the annular groove.

Optionally, an annular clamping groove is formed at the edge of at least one side of the first groove bottom along the axial direction of the piston body;

The piston ring is provided with a skirt edge corresponding to the annular clamping groove, and the skirt edge is embedded in the annular clamping groove.

Optionally, annular clamping grooves are formed on two side edges of the first groove bottom.

Optionally, the annular clamping groove is provided with an inclined wall surface, and the skirt edge is provided with an inclined surface corresponding to the inclined wall surface.

Optionally, the piston ring is made of polytetrafluoroethylene.

Optionally, the width of the elastic sealing ring is smaller than or equal to the width of the second groove bottom along the axial direction of the piston body.

Optionally, the thickness of the elastic sealing ring is 105% to 120% of the height of the step surface.

Optionally, the outer surface of the piston ring protrudes outwardly with respect to the side of the piston body by a dimension in the range of 0.05mm to 0.25mm.

The technical scheme also provides a shock absorber, which comprises a shock absorber cylinder body and the floating piston;

The floating piston is arranged in the shock absorber cylinder body, the piston body and the shock absorber cylinder body are in coaxial relative positions, and the outer surface of the piston ring is in interference fit with the inner wall of the shock absorber cylinder body.

The technical scheme also provides a suspension system which comprises the shock absorber.

The technical scheme also provides a vehicle which comprises the suspension system.

The utility model has the technical effects that the piston ring and the elastic sealing ring are combined to be in interference fit, so that the sealing performance of the piston ring is obviously improved, and the floating piston can better form a sealing fit relation with the piston cylinder body when in use.

Other features of the present utility model and its advantages will become apparent from the following detailed description of exemplary embodiments of the utility model, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description, serve to explain the principles of the utility model.

FIG. 1 is a schematic side cross-sectional view of a floating piston provided in an embodiment of the present utility model;

FIG. 2 is an enlarged partial cross-sectional schematic view of a floating piston in a shock absorber cylinder provided in accordance with an embodiment of the present utility model;

FIG. 3 is a schematic view of a piston ring of a floating piston according to an embodiment of the present utility model;

Fig. 4 is a schematic structural view of a piston body of a floating piston according to an embodiment of the present utility model;

FIG. 5 is a schematic cross-sectional view of a floating piston in a shock absorber cylinder provided in an embodiment of the present utility model.

Reference numerals illustrate:

1031. A floating piston; 1033. a piston body; 1034. piston rings; 10341. a skirt edge; 1035. an elastic sealing ring; 1036. a second groove bottom; 1037. a first groove bottom; 1038. a step surface; 1039. an annular clamping groove; 3. a shock absorber cylinder.

Detailed Description

Various exemplary embodiments of the present utility model will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present utility model unless it is specifically stated otherwise.

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

The features of the application "first", "second" and the like in the description and in the claims may be used for the explicit or implicit inclusion of one or more such features. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

As shown in fig. 1 and 2, the present technical solution provides a floating piston, which can form a tight fitting seal with the inner wall of the cylinder in the shock absorber cylinder, and can float up and down along the cylinder at the same time, so as to realize the piston performance.

The floating piston includes a piston body 1033, an elastomeric seal 1035, and piston rings 1034. The piston body 1033 has a flat cylindrical structure as a whole, and the side surface of the piston body 1033 refers to a cylindrical surface of the outer periphery thereof. An annular groove is formed on a side surface of the piston body 1033, and is recessed toward the center in a radial direction of the piston body 1033. The annular groove is mainly used for providing a space for positioning and fixedly accommodating an elastic sealing ring 1035 and a piston ring 1034 which are sleeved around the piston body 1033. As shown in fig. 1 and 2, the annular groove has a first groove bottom 1037 and a second groove bottom 1036, wherein the second groove bottom 1036 is located in the first groove bottom 1037. Moreover, along the radial direction of the piston body 1033, the overall depth of the second groove bottom 1036 is greater than the overall depth of the first groove bottom 1037. That is, as shown in fig. 1, the second groove bottom 1036 is located inside the first groove bottom 1037, and the second groove bottom 1036 is recessed more toward the central axis direction of the piston body than the first groove bottom 1037, and the second groove bottom 1036 is recessed more deeply.

Alternatively, in other embodiments, the piston body may also be in the form of an elliptic cylinder, a polygonal cylinder, or the like, and the side wall thereof represents a cylindrical surface, which is not limited by the present application.

Thus, a step surface 1038 can be formed between the first groove bottom 1037 and the second groove bottom 1036, and two-layered receiving grooves can be formed. The receiving groove formed by the step surface 1038 and the second groove bottom 1036 is used for receiving the elastic sealing ring 1035, and the first groove bottom 1037 is used for bearing the piston ring 1034 sleeved on the first groove bottom 1037.

The elastic sealing ring 1035 is embedded in a groove formed by the step surface 1038 and the second groove bottom 1036. The elastic sealing ring 1035 has a certain elastic deformation property. Preferably, the elastic sealing ring 1035 may be tightened to be fastened to the second groove bottom 1036, thereby increasing the assembling reliability thereof.

The piston ring 1034 is then fitted in the annular groove, as shown in fig. 1 and 2, the piston ring 1034 covering the elastic sealing ring 1035 from the radial direction. Further, the inner surface of the piston ring 1034 substantially conforms to the first groove bottom 1037. In particular, an interference fit is formed between the inner surface of the piston ring 1034 and the first groove bottom 1037 and the elastic sealing ring 1035, and the inner surface of the piston ring 1034 can be abutted against the first groove bottom 1037 and the elastic sealing ring 1035.

In practice, the diameter of the inner surface of the piston ring 1034 may be designed to be slightly smaller than the diameter of the first groove bottom 1037, such that the piston ring 1034 forms a press-fit with the first groove bottom 1037. Further, the outer surface of the elastic sealing ring 1035 may have a diameter slightly larger than the diameter of the first groove bottom 1037, and/or a portion of the inner surface of the piston ring 1034 may be configured to be embedded in the area of the second groove bottom 1036, i.e., extend into the step surface 1038. In both forms, the outer surface of the elastomeric seal 1035 may form a squeeze-type interference fit with the inner surface of the piston ring 1034.

By adopting the design of the technical scheme, the piston ring 1034 and the elastic sealing ring 1035 are of a two-layer nested structure, and the elastic sealing ring 1035 of the inner layer is used for providing elastic and compacting acting force and providing the piston ring 1034 with the function of outwards stretching along the radial direction. The outer piston ring 1034 is then used to form a compression seal with the inner surface of the damper cylinder and to effect relative sliding movement. The double nested structure can provide a more stable sealing effect. Further, the annular groove of this scheme has designed two-layer groove structure, corresponds to elastic seal 1035 and piston ring 1034 respectively, cooperation interference fit, and this kind of relation can provide good location, fixed action for elastic seal 1035 and piston ring 1034, avoids piston ring 1034 to produce risk situations such as fatigue, dislocation, droing when carrying out sliding fit for a long time with shock absorber cylinder body 3.

Optionally, the thickness of the elastic sealing ring 1035 along the radial direction is preferably greater than the height of the step surface 1038 between the second groove bottom 1036 and the first groove bottom 1037. That is, the elastic sealing ring 1035 protrudes a little radially outward with respect to the surface of the second groove bottom 1036. In this way, the piston ring 1034 can form an extrusion contact with the elastic sealing ring 1035 without making a special-shaped structure on the inner surface, so as to form an interference fit relationship. Moreover, this design allows a better outward pushing action on the piston ring 1034 from the inner elastic sealing ring 1035, providing a better sealing compression for the piston ring 1034 between the damper cylinders 3.

Optionally, the outer surface of the piston ring 1034 protrudes outwardly a small distance relative to the side wall of the piston body 1033 along the radial direction of the piston body 1033. That is, the outer surface of the piston ring 1034 protrudes outward of the annular groove by a segment. The dimensions of the protrusions are related to the ability to better bring the piston ring 1034 into pressing contact with the damper cylinder 3 shown in fig. 2, into sealing engagement. Moreover, the outward protrusion of the piston ring 1034 can protect the piston body 1033, and reduce direct rigid friction and contact between the side wall of the piston body 1033 and the inner wall of the shock absorber cylinder 3, thereby improving the structural reliability and service life of the piston body 1033.

In particular, as shown in fig. 1 to 4, the piston body 1033 may further have an annular clamping groove 1039 formed thereon. The annular catching grooves 1039 may be formed at both sides of the first groove bottom 1037 along the axial direction of the piston body 1033. Among them, an annular groove 1039 is preferably formed at least on one side of the first groove bottom 1037. That is, as shown in fig. 2 and 3, the annular clamping groove 1039 may be formed at an upper side and/or a lower side of the first groove bottom 1037.

The annular groove 1039 is used to provide further securement and positioning for the piston ring 1034 to prevent axial misalignment relative to the piston body 1033 during piston movement. The piston ring may further have a protruding skirt 10341 formed thereon, and the position of the skirt 10341 corresponds to the position of the annular clamping groove 1039. If an annular locking groove 1039 is formed on only one side of the first groove bottom 1037, a skirt 10341 is formed on only the corresponding side of the piston ring 1034. Further, in the embodiment in which the annular locking grooves 1039 are formed at both sides of the first groove bottom 1037, as shown in fig. 1 to 4, two skirts 10341 may be formed on the piston ring 1034.

During actual assembly, the skirt 10341 may be inserted into the annular recess 1039 to provide further relative positioning of the piston ring 1034 and the piston body 1033. Preferably, the first groove bottom is formed with annular grooves 1039 on both sides, which on one hand can better provide positioning for the piston ring 1034, and on the other hand, can also help to form an interference fit between the piston ring 1034 and the elastic sealing ring 1035. The two annular clamping grooves 1039 can make the inner surface of the piston ring 1034 better contact and cling to the outer surface of the elastic sealing ring 1035 under the extrusion action from two sides.

Alternatively, as shown in fig. 1, 2 and 5, the annular clamping groove 1039 may have an inclined wall surface therein. The skirt 10341 has a slope corresponding to the inclined wall surface. The inclined wall surface facilitates assembly of the piston ring 1034, and enables the piston ring 1034 to be more conveniently attached to the first groove bottom 1037 and the elastic sealing ring 1035. Avoiding the occurrence of a step of, during assembly, the skirt 10341 is in a counterbalancing relationship with the first groove bottom 1037, resulting in assembly difficulties.

On the other hand, as shown in fig. 2, the inclined wall surface extends upward and downward in the axial direction, and the skirt 10341 is bonded thereto. This design mode is more favorable to forming the supporting effect to the upper and lower both sides to piston ring 1034, especially when the surface of piston ring 1034 receives the extrusion effect of shock absorber cylinder body 3, the shirt rim 10341 of both sides produces the effort and the slight deformation of valgus to upper and lower both sides for elastic sealing washer 1035 forms close contact with the internal surface of piston ring 1034 better, guarantees sealed effect.

Optionally, the piston ring is made of polytetrafluoroethylene, and the polytetrafluoroethylene is used as an industrial material, has good lubricating performance and can form a sliding fit relationship with the metal surface better. The piston ring is made of the industrial material, so that sliding fit with the shock absorber cylinder body is facilitated, the tightness is ensured, and medium exchange between two cavities separated by the floating piston 1031 in the shock absorber cylinder body is avoided.

Alternatively, as shown in fig. 1 and 2, the width of the elastic sealing ring 1035 may be slightly smaller than the width of the second groove bottom 1036 along the axial direction of the piston body 1031. That is, a small gap is left between both sides of the elastic seal 1035. This design allows room for elastic deformation of the elastic sealing ring 1035. In practical application, the piston ring 1034 forms an extrusion fit with the elastic sealing ring 1035, and the elastic sealing ring 1035 can deform toward the space gap defined by the second groove bottom 1036 and the step surface 1039, so as to avoid elastic fatigue caused by the continuous high-pressure extrusion state. Moreover, the design of such a gap may provide some self-elastic action adjustment space when floating piston 1031 is subjected to varying degrees of pressure, which may help to improve the overall piston athletic performance of floating piston 1031.

Alternatively, the thickness of the elastic sealing ring 1035 may be 105% to 120% of the height of the step surface 1038 along the radial direction. As described above, the thickness of the elastic sealing ring 1035 is slightly greater than the height of the step surface 1038, and the design is preferably in a range of numerical proportions, so that the elastic sealing ring can exhibit better elastic sealing effect. If the thickness of the elastic sealing ring 1035 is less than 105% of the height of the step surface 1038, the elastic force output to the piston ring 1034 is limited, and the elastic sealing effect is not optimal. On the other hand, the thickness difference is not too high. If the thickness of the elastic sealing ring 1035 is more than 120% of the height of the step surface 1038, this may cause the elastic sealing ring 1035 to continuously receive a large pressing force. This, in turn, may cause the edges of the piston ring 1034 to not nest well in the annular groove, rather reducing seal reliability. Moreover, long-term exposure to large compressive forces may result in fatigue aging of the elastomeric seal 1035 and a compromised service life. Therefore, the thickness difference between the two is preferably between 105% and 120%.

Optionally, as described above, the outer surface of the piston ring 1034 protrudes outwardly a small distance relative to the side of the piston body 1033. The protruding dimension preferably ranges from 0.05mm to 0.25mm. If the size of the piston ring 1034 protruding outwards relative to the piston body 1033 is too large, this may result in a decrease in the stability of the piston movement of the floating piston 1031 as a whole in the shock absorber cylinder 3, which is prone to tilting and dislocation phenomena, affecting the movement performance of the shock absorber or the like to which it is applied. On the other hand, the above-mentioned protruding dimension is not easily too small, otherwise the sealing performance cannot be further improved. On the other hand, the piston body 1033 may be in rigid frictional contact with the inner wall of the damper cylinder 3. Such rigid frictional contact, if occurring over a long period of time, can affect the useful life of floating piston 1031 to some extent.

The present solution also provides a shock absorber comprising a shock absorber cylinder 3 and the floating piston 1031 described above. As shown in fig. 2 and 5, the floating piston 1031 is disposed in the damper cylinder 3, the piston body 1033 is in a coaxial relative position with the damper cylinder 3, and the outer surface of the piston ring 1034 is in interference fit with the inner wall of the damper cylinder 3. The floating piston 1031 can float up and down in the damper cylinder 3 to realize a piston movement function. When the shock absorber receives impact, the floating piston moves up and down to absorb the impact, so that the shock absorbing effect is realized.

According to another embodiment of the present disclosure, there is provided a suspension system including a shock absorber according to an embodiment of the present disclosure.

According to another embodiment of the present disclosure, a vehicle is provided that includes a suspension system according to an embodiment of the present disclosure.

The foregoing embodiments mainly describe differences between the embodiments, and as long as there is no contradiction between different optimization features of the embodiments, the embodiments may be combined to form a better embodiment, and in consideration of brevity of line text, no further description is given here.

While certain specific embodiments of the utility model have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the utility model. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the utility model. The scope of the utility model is defined by the appended claims.

Claims (13)

1. A floating piston for a shock absorber, comprising:

The piston comprises a piston body, wherein an annular groove is formed in the side face of the piston body, a first groove bottom and a second groove bottom are formed in the annular groove, the second groove bottom is positioned in the first groove bottom, and the depth of the second groove bottom is larger than that of the first groove bottom along the radial direction of the piston body so that a step surface is formed between the second groove bottom and the first groove bottom;

The elastic sealing ring is embedded in a groove formed by the step surface and the second groove bottom;

the piston ring is sleeved in the annular groove, and the inner surface of the piston ring is in interference fit with the first groove bottom and the elastic sealing ring.

2. The floating piston of claim 1 wherein the thickness of said elastomeric seal ring is greater than the height of the step surface between said second groove bottom and said first groove bottom.

3. The floating piston of claim 1, wherein an outer surface of said piston ring protrudes out of said annular groove in a radial direction of said piston body.

4. The floating piston of claim 1, wherein an annular clamping groove is formed at least one side edge of the first groove bottom along the axial direction of the piston body;

The piston ring is provided with a skirt edge corresponding to the annular clamping groove, and the skirt edge is embedded in the annular clamping groove.

5. The floating piston of claim 4 wherein the first groove bottom has annular clamping grooves formed on both side edges thereof.

6. A floating piston according to claim 4 or 5, wherein said annular clamping groove has an inclined wall surface, and said skirt has a slope corresponding to said inclined wall surface.

7. A floating piston as claimed in claim 1, wherein the piston ring is made of polytetrafluoroethylene.

8. The floating piston of claim 1, wherein the width of the elastic sealing ring is less than or equal to the width of the second groove bottom along the axial direction of the piston body.

9. A floating piston according to claim 2, wherein the thickness of the elastic sealing ring is 105 to 120% of the height of the step surface.

10. A floating piston according to claim 3, wherein the outer surface of the piston ring protrudes outwardly with respect to the side of the piston body by a dimension in the range of 0.05mm to 0.25mm.

11. A shock absorber comprising a shock absorber cylinder and a floating piston according to any one of claims 1 to 10;

The floating piston is arranged in the shock absorber cylinder body, the piston body and the shock absorber cylinder body are in coaxial relative positions, and the outer surface of the piston ring is in interference fit with the inner wall of the shock absorber cylinder body.

12. A suspension system comprising the shock absorber of claim 11.

13. A vehicle, characterized in that it is fitted with a suspension system according to claim 12.