Piston of automobile shock absorber

Abstract

The utility model provides an automobile shock absorber piston which comprises a piston body, and a sealing ring is formed on the peripheral wall of the piston body in a wrapping mode through a rubber coating technology. A plurality of annular convex edges which are distributed at intervals in the axial direction of the piston body are arranged on the peripheral wall of the piston body, and the annular convex edges are fixedly embedded into annular grooves formed in the inner wall of the sealing ring; a plurality of embedding holes which are distributed at intervals in the circumferential direction of the piston body are formed in the outer wall, between every two adjacent annular convex edges, of the piston body, each embedding hole is a blind hole and extends inwards in the radial direction of the piston body, and first embedding blocks which are embedded into the embedding holes are arranged on the inner wall of the sealing ring; the sealing ring can be effectively prevented from axially displacing relative to the piston body and even being separated from the piston body, so that the sealing effect of the sealing ring on a gap between the piston body and a working cylinder barrel can be ensured.

Description

Technical Field

[0001] This utility model relates to the technical field of automotive shock absorber accessories, and more specifically, to an automotive shock absorber piston. Background Technology

[0002] The piston in an automotive shock absorber is a crucial component. During operation, the piston is installed inside the working cylinder within the shock absorber, and the piston and working cylinder are slidably connected. Furthermore, a sealing ring is fitted onto the outer wall of the piston to seal the gap between the piston and the working cylinder. However, in this structure, because the sealing ring relies solely on contractile force to adhere to the outer wall of the piston, when the piston slides relative to the working cylinder, the friction between the outer wall of the sealing ring and the inner wall of the working cylinder can easily cause axial displacement of the sealing ring relative to the piston, or even cause it to detach from the piston. This affects the sealing effect of the sealing ring on the gap between the piston and the working cylinder. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide an automotive shock absorber piston that can effectively prevent the sealing ring from axially displacing relative to the piston body or even detaching from the piston body, thereby ensuring the sealing effect of the sealing ring on the gap between the piston body and the working cylinder.

[0004] This utility model provides a piston for an automotive shock absorber, including a piston body. A sealing ring is formed on the outer peripheral wall of the piston body by an overmolding process. Several annular protrusions are provided on the outer peripheral wall of the piston body, which are spaced apart along the axial direction of the piston body. The annular protrusions are embedded in annular grooves formed on the inner wall of the sealing ring. Several holes are provided on the outer wall of the piston body between each two adjacent annular protrusions, which are spaced apart along the circumferential direction of the piston body. Each hole is a blind hole and extends inward along the radial direction of the piston body. A first insert is provided on the inner wall of the sealing ring to fit into each hole.

[0005] By adopting the above-mentioned structure, this utility model, under the locking action of the annular convex edge and the annular groove, and under the locking action of the first insert and the insert hole, can effectively prevent the sealing ring from axially displacing relative to the piston body or even detaching from the piston body when the piston body slides relative to the working cylinder, thereby ensuring the sealing effect of the sealing ring on the gap between the piston body and the working cylinder.

[0006] In one possible implementation, an annular conical surface is provided on the inner wall of the outer end of each insert; by adopting this structure, during the process of wrapping the sealing ring onto the outer peripheral wall of the piston body through the overmolding process, the raw material used to make the sealing ring can more smoothly penetrate into the insert and solidify to form the first insert under the action of the annular conical surface.

[0007] In one possible implementation, a plurality of reinforcing blocks are provided on the outer wall of the piston body between each pair of adjacent annular protrusions, spaced apart in the circumferential direction around the piston body. A groove is formed between each pair of adjacent reinforcing blocks, and a second insert is provided on the inner wall of the sealing ring for engaging with each groove. By adopting this structure, the connection strength between the two adjacent annular protrusions and the piston body can be improved under the action of the reinforcing blocks, and the connection strength between the sealing ring and the piston body can be further improved after each second insert engages with the groove at the corresponding position.

[0008] In one possible implementation, the upper and lower ends of each reinforcing block are integrally connected to the adjacent annular protrusions; by adopting this structure, each reinforcing block can achieve a tightening effect on the two adjacent annular protrusions, thereby further improving the connection strength between the annular protrusions and the piston body.

[0009] In one possible implementation, a plurality of oil discharge holes are provided at the center of the piston body in the radial direction, and are spaced apart in the circumferential direction around the piston body. Each oil discharge hole axially penetrates the piston body, and a plurality of reinforcing ribs are provided on the inner side of each oil discharge hole, which are spaced apart in the circumferential direction around the piston body. Each reinforcing rib is integrally connected to the piston body located on the side wall of the oil discharge hole. By adopting this structure, the structural strength of the piston body located at each oil discharge hole can be improved. Attached Figure Description

[0010] Figure 1 This is a cross-sectional view of the assembled sealing ring and piston body.

[0011] Figure 2 This is a schematic diagram of the first three-dimensional structure of the piston body.

[0012] Figure 3 for Figure 1 A magnified structural diagram of point A in the middle;

[0013] Figure 4 for Figure 2 A magnified structural diagram of point B in the middle;

[0014] Figure 5 This is a second three-dimensional structural diagram of the piston body. Detailed Implementation

[0015] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0016] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0017] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0018] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] See Figure 1-5 As shown in the figure, this application discloses an automotive shock absorber piston, including a piston body 1. A sealing ring 2 is formed on the outer peripheral wall of the piston body 1 by a rubber coating process. A plurality of annular protrusions 11 are provided on the outer peripheral wall of the piston body 1, which are spaced apart along the axial direction of the piston body 1. The annular protrusions 11 are fixedly embedded in the annular grooves 21 formed on the inner wall of the sealing ring 2. A plurality of embedded holes 12 are provided on the outer wall of the piston body 1 between each two adjacent annular protrusions 11, which are spaced apart around the circumferential direction of the piston body 1. Each embedded hole 12 is a blind hole, and each embedded hole 12 extends inward along the radial direction of the piston body 1. A first insert 22 is provided on the inner wall of the sealing ring 2, which is fitted with each embedded hole 12.

[0020] An annular conical surface 121 is provided on the inner wall of the outer end of each recess 12. With this structure, during the process of wrapping the sealing ring onto the outer peripheral wall of the piston body through the rubber coating process, the raw material used to make the sealing ring can penetrate into the recess more smoothly under the action of the annular conical surface and solidify to form the first insert.

[0021] On the outer wall of the piston body 1 between each pair of adjacent annular protrusions 11, there are several reinforcing blocks 13 spaced apart in the circumferential direction around the piston body 1. A groove 14 is formed between each pair of adjacent reinforcing blocks 13. The inner wall of the sealing ring 2 is provided with a second insert 23 for engaging with each groove 14. By adopting this structure, under the action of the reinforcing blocks, the connection strength between the two adjacent annular protrusions and the piston body can be improved. Furthermore, after each second insert engages with the groove at the corresponding position, the connection strength between the sealing ring and the piston body can be further improved.

[0022] The upper and lower ends of each reinforcing block 13 are connected to the adjacent annular protrusion 11. With this structure, each reinforcing block can tighten the two adjacent annular protrusions, thereby further improving the connection strength between the annular protrusions and the piston body.

[0023] A plurality of oil discharge holes 15 are provided at the center of the piston body 1 in the radial direction and are spaced apart in the circumferential direction around the piston body 1. Each oil discharge hole 15 penetrates the piston body 1 axially. A plurality of reinforcing ribs 16 are provided on the inner side of each oil discharge hole 15 and are spaced apart in the circumferential direction around the piston body 1. Each reinforcing rib 16 is integrally connected to the piston body 1 located on the side wall of the oil discharge hole 15. By adopting this structure, the structural strength of the piston body located at each oil discharge hole can be improved.

[0024] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A piston for an automotive shock absorber, comprising a piston body (1), wherein a sealing ring (2) is formed on the outer peripheral wall of the piston body (1) by an overmolding process; characterized in that: The outer peripheral wall of the piston body (1) is provided with a plurality of annular protrusions (11) spaced apart along the axial direction of the piston body (1). The annular protrusions (11) are fitted into the annular grooves (21) formed on the inner wall of the sealing ring (2). The outer wall of the piston body (1) between each two adjacent annular protrusions (11) is provided with a plurality of interlocking holes (12) spaced apart around the circumferential direction of the piston body (1). Each interlocking hole (12) is a blind hole. Each interlocking hole (12) extends inward along the radial direction of the piston body (1). The inner wall of the sealing ring (2) is provided with a first insert (22) that fits into each interlocking hole (12).

2. The automotive shock absorber piston according to claim 1, characterized in that: An annular conical surface (121) is provided on the inner wall of the outer end of each of the aforementioned holes (12).

3. The automotive shock absorber piston according to claim 1 or 2, characterized in that: On the outer wall of the piston body (1) between each two adjacent annular protrusions (11), there are a number of reinforcing blocks (13) spaced apart in the circumferential direction around the piston body (1), and a groove (14) is formed between each two adjacent reinforcing blocks (13). On the inner wall of the sealing ring (2), there is a second insert (23) for fitting into each of the grooves (14).

4. The automotive shock absorber piston according to claim 3, characterized in that: The upper and lower ends of each of the reinforcing blocks (13) are connected to the adjacent annular protrusions (11) in one piece.

5. The automotive shock absorber piston according to claim 1, characterized in that: The piston body (1) has a plurality of oil discharge holes (15) arranged at intervals in the radial direction at the center. Each oil discharge hole (15) penetrates the piston body (1) axially. Each oil discharge hole (15) has a plurality of reinforcing ribs (16) arranged at intervals in the circumferential direction around the piston body (1) on its inner side. Each reinforcing rib (16) is connected to the piston body (1) located on the side wall of the oil discharge hole (15).

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