Automobile shock absorber piston mounting assembly

Abstract

The utility model provides a kind of automobile shock absorber piston mounting assembly, including piston main body and self-centering fixture, self-centering fixture is used to install piston main body.The front end of piston main body is equipped with several process holes, process hole is equi-proportional circumferential array distribution on the front end surface of piston main body, and the latch corresponding with process hole is equipped on self-centering fixture.When assembling piston, the latch is aligned and inserted into process hole, and the clamping of piston is completed by the interference fit between fixture and piston.The utility model completes the assembly of piston main body by self-centering fixture, and the over positioning system is formed by multiple-point contact between self-centering fixture and piston main body, automatically compensates processing error, and the problem of poor clamping stability is avoided by grommet extrusion clamping to avoid the attenuation of fixture clamping force caused by metal creep.

Description

Technical Field

[0001] This utility model relates to the field of automotive suspension system manufacturing technology, and in particular to an automotive shock absorber piston mounting assembly. Background Technology

[0002] In a car's suspension system, the shock absorber is a key component balancing vehicle comfort and handling. It works by using the principle of a piston reciprocating within a cylinder to control fluid flow and generate damping force, thus attenuating body vibrations and suppressing wheel bounce. The shock absorber piston, as the core actuator, directly determines the accuracy and stability of the damping force and the shock absorber's lifespan. It controls fluid flow characteristics through the layout of oil holes and valve design, while relying on a sealing structure to prevent fluid leakage. It is the core carrier for achieving both "road impact filtering" and "vehicle attitude control."

[0003] Traditional pistons are assembled by spin forming by clamping the outer circumference of the piston with a ring clamp. This assembly method has several problems. First, the ring clamp lacks a positioning system, which can easily cause concentricity deviations during the assembly process. Second, metal creep can cause the clamping force of the ring clamp to decrease, resulting in poor clamping stability. Summary of the Invention

[0004] To address the aforementioned problems, this utility model provides an automotive shock absorber piston mounting assembly.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A piston mounting assembly for an automotive shock absorber includes a piston body and a self-centering clamp for mounting the piston body. The piston body is cylindrical, with a piston rod mating groove at its rear end for engaging with a piston rod. A rubber-coated groove is provided on the outer surface of the piston body, and an internal thread is provided on its inner surface. A step is provided at the front end of the piston body, with several process holes arranged in a proportional circular array on the front surface of the piston body. Several oil holes are also provided on the step, arranged in a proportional circular array on the front surface of the piston body, penetrating the front surface of the piston body. The self-centering clamp includes a clamp body, pins, and washers. The clamp body is a cylindrical, single-sided open cap-like body. A clamping groove for holding the piston body is provided at the front end of the clamp body, and several pins are fixedly connected to the bottom of the clamping groove.

[0006] Furthermore, the shape and size of the clamping groove opening are adapted to the shape and size of the front end surface of the piston body.

[0007] Furthermore, the pin is a cylinder, and the pins are distributed in a proportional circumferential array on the bottom surface of the clamping groove. The shape, size, length, and position of the pin are adapted to the shape, size, depth, and position of the process hole on the piston body.

[0008] Furthermore, the process hole does not penetrate the front end surface of the piston body.

[0009] Furthermore, the process holes are located at the edge of the front end surface of the piston body, and the oil holes are located at the center of the front end surface of the piston body.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: The piston mounting assembly of the automobile shock absorber of this utility model completes the assembly of the piston body by means of a self-centering fixture. The self-centering fixture and the piston body form an over-positioning system through multi-point contact between the pin and the process hole, which automatically compensates for processing errors and avoids the problem of concentricity deviation during installation. At the same time, the piston body is clamped by the gasket between the piston body and the gasket through interference fit, which also avoids the problem of poor clamping stability caused by metal creep due to the decrease of clamping force of the fixture. Attached Figure Description

[0011] Figure 1 This is a three-dimensional schematic diagram of the piston body of the automotive shock absorber piston mounting assembly of this utility model; Figure 2 This is a three-dimensional schematic diagram of the piston body of the automotive shock absorber piston mounting assembly of this utility model, viewed from the rear. Figure 3 This is a front view of the piston body of the automotive shock absorber piston mounting assembly of this utility model; Figure 4 This is a side cross-sectional view of the piston body of the automotive shock absorber piston mounting assembly of this utility model. Figure 5 This is a three-dimensional schematic diagram of the self-centering clamp for the piston mounting assembly of an automotive shock absorber according to this utility model. Figure 6 This is a front view of the self-centering clamp for the automotive shock absorber piston mounting assembly of this utility model.

[0012] In the figure: 1. Piston body; 11. Process hole; 12. Rubber groove; 13. Oil hole; 14. Step; 15. Piston rod mating groove; 16. Internal thread; 2. Self-centering fixture; 21. Fixture body; 22. Pin; 23. Washer; 24. Clamping groove. Detailed Implementation

[0013] To provide a better understanding of the purpose, structure, features, and functions of this utility model, detailed descriptions are provided below with reference to specific embodiments.

[0014] Please refer to the reference. Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6An embodiment of the present invention provides an automotive shock absorber piston mounting assembly, comprising a piston body 1 and a self-centering clamp 2, wherein the self-centering clamp 2 is a tool for mounting the piston body 1.

[0015] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the piston body 1 is a cylinder. A piston rod mating groove 15 is formed at the rear end of the piston body 1 for mates with the piston rod. Internal threads 16 are provided on the inner sidewall of the piston body 1, and a rubber-coating groove 12 is provided on the outer sidewall of the piston body 1. A step 14 is provided at the front end of the piston body 1, and several process holes 11 are provided on the step 14. The process holes 11 are distributed in a proportional circular array on the front end surface of the piston body 1. The process holes 11 do not penetrate the front end surface of the piston body 1. This design prevents oil from leaking out from the process holes 11 and thus affecting the function of the piston body 1. Several oil holes 13 are also provided on the step 14. The oil holes 13 are distributed in a proportional circular array on the front end surface of the piston body 1, and the oil holes 13 penetrate the front end surface of the piston body 1. To avoid affecting the function of the piston body 1, the process holes 11 are located at the edges of the front end surface of the piston body 1, and the oil holes 13 are located at the center of the front end surface of the piston body 1.

[0016] like Figure 5 and Figure 6 As shown, the self-centering fixture 2 includes a fixture body 21, pins 22, and washers 23. The fixture body 21 is a cylindrical, single-sided open cap-shaped body. The front end of the fixture body 21 has a clamping groove 24 for clamping the piston body 1. The shape and size of the opening of the clamping groove 24 are adapted to the shape and size of the front end surface of the piston body 1. Several pins 22 are fixedly connected at the bottom of the clamping groove 24. The pins 22 are cylindrical and are distributed in a proportional circumferential array on the bottom surface of the clamping groove 24. The shape, size, length, and position of the pins 22 are adapted to the shape, size, depth, and position of the process holes 11 on the piston body 1.

[0017] An elastic washer 23 is fixedly connected to the inner wall of the clamping groove 24. The washer 23 is located near the opening of the clamping groove 24. The washer 23 is made of elastic material, such as nitrile rubber or EPDM.

[0018] During installation, align the pin 22 with the process hole 11 and insert it. At this time, the washer 23 on the inner wall of the clamping groove 24 is squeezed by the outer wall of the piston body 1 and shrinks towards the inner wall of the clamping groove 24. The piston body 1 is squeezed and fixed inside the clamping groove 24 by the reaction force of the washer 23. Then, align the piston rod mating groove 15 with the piston rod connection part, hold the self-centering clamp 2, and screw the piston body 1 onto the piston rod by the engagement of the internal thread 16 on the piston body 1 and the external thread on the piston rod. After the assembly is completed, apply external force to pull the self-centering clamp 2 out of the piston body 1.

[0019] As described above, the automotive shock absorber piston mounting assembly of this utility model completes the assembly of the piston body using a self-centering fixture. The self-centering fixture and the piston body form an over-positioning system through multi-point contact between the pin and the process hole, which automatically compensates for machining errors and avoids the problem of concentricity deviation during installation. At the same time, the piston body is clamped between the washer and the piston body through an interference fit, which also avoids the problem of poor clamping stability caused by metal creep leading to a decrease in clamping force.

[0020] This utility model has been described by the above-described embodiments; however, these embodiments are merely examples for implementing this utility model. It must be noted that the disclosed embodiments do not limit the scope of this utility model. Conversely, any modifications and refinements made without departing from the spirit and scope of this utility model are within the scope of patent protection of this utility model.

Claims

1. A piston mounting assembly for an automotive shock absorber, comprising a piston body (1), characterized in that: It also includes a self-centering fixture (2) for mounting the piston body (1); the piston body (1) is a cylinder, with a piston rod mating groove (15) for cooperating with the piston rod at the rear end of the piston body (1), a rubber-coated groove (12) on the outer side of the piston body (1), an internal thread (16) on the inner side of the piston body (1), a step (14) on the front end of the piston body (1), and a plurality of process holes (11) on the step (14). The process holes (11) are distributed in a proportional circular array on the front end surface of the piston body (1). The step (14) is also provided with a number of oil holes (13). The oil holes (13) are distributed in a proportional circular array on the front end surface of the piston body (1). The oil holes (13) penetrate the front end surface of the piston body (1). The self-centering clamp (2) includes a clamp body (21), pins (22) and washers (23). The clamp body (21) is a cylindrical single-sided open cap-shaped body. The front end of the clamp body (21) has a clamping groove (24) for clamping the piston body (1). A number of pins (22) are fixedly connected at the bottom of the clamping groove (24).

2. The automotive shock absorber piston mounting assembly as described in claim 1, characterized in that: The shape and size of the opening of the clamping groove (24) are adapted to the shape and size of the front end surface of the piston body (1).

3. The automotive shock absorber piston mounting assembly as described in claim 1, characterized in that: The pin (22) is a cylinder, and the pins (22) are distributed in a proportional circular array on the bottom surface of the clamping groove (24). The shape, size, length and position of the pin (22) are adapted to the shape, size, hole depth and position of the process hole (11) on the piston body (1).

4. The automotive shock absorber piston mounting assembly as described in claim 1, characterized in that: The process hole (11) does not penetrate the front end surface of the piston body (1).

5. The automotive shock absorber piston mounting assembly as described in claim 1, characterized in that: The process holes (11) are located at the edge of the front end surface of the piston body (1), and the oil holes (13) are located at the center of the front end surface of the piston body (1).

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