The double-sided piston valve body of the shock absorber, the piston assembly containing it, and the shock absorber.

Abstract

This invention provides a double-sided piston valve body for a vibration damper, as well as a piston assembly and a vibration damper comprising the valve body. The upper end face of the double-sided piston valve body has an upper outer valve line and an upper inner valve line; the lower end face has a lower outer valve line and a lower inner valve line; the interior of the double-sided piston valve body is provided with a set of return stroke oil channels and compression stroke oil channels penetrating both end faces; the return stroke oil channel consists of a streamlined first inlet bend and a gradually widening first outlet channel; the compression stroke oil channel consists of a streamlined second inlet bend and a gradually widening second outlet channel. By employing a specific structure, the double-sided piston valve body of this invention exhibits low adhesion between the valve plate and the valve body, which improves the low-temperature characteristics of the vibration damper, lowers the valve opening threshold, enhances comfort, and eliminates abnormal noise. Furthermore, the specific oil channel structure prevents the oil from generating eddies, further suppressing abnormal noise.

Description

Technical Field

[0001] This utility model relates to shock absorbers and their components, and more particularly to a double-sided piston valve body of a shock absorber, a piston assembly including the valve body, and an automotive shock absorber. Background Technology

[0002] With the rapid development of China's automotive industry and the increasing sophistication of people's understanding of automobiles, users have higher and higher requirements for vehicle performance and quality. Chassis performance is an important indicator for evaluating the quality of a vehicle, and shock absorbers, as a crucial component of the chassis system, directly affect the vehicle's handling stability and ride comfort.

[0003] In automotive shock absorbers, the piston valve is a crucial component determining their performance; the structure of the piston valve system largely dictates the shock absorber's capabilities. In existing technologies, due to limitations in the valve body structure, the contact area between the valve plate and the valve cable is relatively large, resulting in significant adhesion between the valve plate and the valve body. This leads to the following adverse effects (particularly noticeable under low-temperature conditions): 1) Collision noise caused by sluggish valve plate movement: When the adhesion between the valve plate and the valve body is too strong, the valve plate cannot respond to the movement command in time under oil pressure changes, resulting in delayed or stuck opening and closing action. This sluggish movement will cause the valve plate to collide abnormally with adjacent components (such as the valve body or limiting structure), producing a metallic impact sound (similar to a "ticking" sound).

[0004] 2) The "stick-slip effect" induces high-frequency frictional noise; strong adhesion easily causes the "stick-slip effect" on the contact surface between the valve plate and the valve body: the valve plate repeatedly sticks and suddenly slides at the microscale, generating high-frequency vibration. This vibration is transmitted to the vehicle body through the piston rod, forming a sharp "squeaking" sound.

[0005] 3) Causes turbulent noise; excessive adhesion force will interfere with the formation of the oil film between the valve plate and the valve body, resulting in sudden changes in local oil flow rate. When high-speed oil flows through irregular gaps, turbulent vortices and cavitation bubbles will be generated (especially under low temperature or high load conditions), causing a "hissing" sound. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a double-sided piston valve body for a shock absorber, as well as a piston assembly and a shock absorber containing the valve body. The double-sided piston valve body of this invention, through a specific structure, exhibits low adhesion between the valve plate and the valve body, which improves the low-temperature characteristics of the shock absorber, lowers the valve opening threshold, enhances comfort, and eliminates abnormal noise. Furthermore, the specific oil passage structure prevents the oil from generating eddies, further suppressing abnormal noise.

[0007] To achieve the above objectives, this utility model provides the following technical solution: The shock absorber has a double-sided piston valve body. The upper end face of the double-sided piston valve body has an upper outer valve line and an upper inner valve line. A recovery stroke oil inlet groove is provided between the upper outer valve line and the upper inner valve line. A compression stroke oil outlet groove is provided on the inner side of the upper inner valve line. The lower end face of the double-sided piston valve body has a lower outer valve line and a lower inner valve line. A compression stroke oil inlet groove is provided between the lower outer valve line and the lower inner valve line. A recovery stroke oil outlet groove is provided on the inner side of the lower inner valve line. The double-sided piston valve body internally has a set of recovery stroke oil channels and compression stroke oil channels penetrating both end faces. The recovery stroke oil channel and the compression stroke oil channel are offset in the circumferential direction of the valve body; the inlet of the recovery stroke oil channel is located in the recovery stroke oil inlet groove, and its outlet is located in the recovery stroke oil outlet groove; the inlet of the compression stroke oil channel is located in the compression stroke oil inlet groove, and its outlet is located in the compression stroke oil outlet groove; the recovery stroke oil channel consists of a streamlined first inlet bend and a gradually expanding first outlet channel; the compression stroke oil channel consists of a streamlined second inlet bend and a gradually expanding second outlet channel.

[0008] Compared with the prior art, this utility model reduces the contact area between the valve plate and the valve body by slotting between the outer valve line and the inner valve line, as well as on the inner side of the inner valve line. This reduces the adhesion between the valve plate and the valve body, improves the low-temperature characteristics of the shock absorber, lowers the valve opening threshold, improves comfort, and eliminates abnormal noise. In addition, in this utility model, the recovery stroke oil channel consists of a streamlined first inlet bend and a gradually widening first outlet channel; the compression stroke oil channel consists of a streamlined second inlet bend and a gradually widening second outlet channel. The combination of the streamlined inlet bend and the gradually widening outlet channel can reduce the eddy current phenomenon generated by the shock absorber oil in the oil channel, thereby avoiding abnormal noise. Furthermore, the gradually widening outlet channel further reduces the width of the valve line, thereby further reducing the adhesion between the valve plate and the valve body.

[0009] Furthermore, in the aforementioned double-sided piston valve body of the shock absorber, the number of the recovery stroke oil channels can be 4-6, and the number of the compression stroke oil channels is the same as the number of the recovery stroke oil channels.

[0010] Furthermore, in the aforementioned double-sided piston valve body of the shock absorber, the cross-sections of both the first and second inlet bends are fan-shaped, gradually expanding radially. Providing a fan-shaped fluid flow channel on a circular valve body helps reduce the difficulty of mold manufacturing.

[0011] The technical solution of this utility model for the valve system assembly is as follows: The piston assembly of the shock absorber includes a piston rod, and a compression stroke damping valve plate assembly, a valve body, and a return stroke damping valve plate assembly sequentially disposed at the end of the piston rod. The valve body is the double-sided piston valve body of the present invention, with the compression stroke damping valve plate assembly abutting against the upper inner valve line, and the return stroke damping valve plate assembly abutting against the lower inner valve line. In the piston assembly of the present invention, the valve body has a specific structural design, reducing the contact area between the valve plate and the valve body, thereby reducing the adhesion force between the valve plate and the valve line, improving the comfort of the shock absorber during operation, suppressing abnormal noise, and the specific fluid flow channel structure makes it difficult for the oil to generate eddies, thus further suppressing noise.

[0012] The technical solution of this utility model for the vibration damper is as follows: The shock absorber includes the piston assembly of the present invention. The shock absorber of the present invention uses the piston assembly of the present invention, which improves low-temperature characteristics, has a low valve opening threshold, provides good comfort, and is less prone to abnormal noise.

[0013] As a specific form, the aforementioned shock absorber is a single-tube shock absorber, including a cylinder. An oil seal assembly is provided at the top of the cylinder, and a floating piston is provided inside the cylinder. The floating piston divides the internal space of the cylinder into an oil chamber and an air chamber. The oil chamber is located above the floating piston, and the air chamber is located below the floating piston. The piston assembly of this utility model is installed in the oil chamber. The piston rod of the piston assembly extends from the oil seal assembly to the outside.

[0014] As another specific form, the aforementioned shock absorber is a twin-cylinder shock absorber, including an oil reservoir and a working cylinder disposed within the oil reservoir. The bottom of the working cylinder is provided with a bottom valve, and the top of the working cylinder is provided with an oil seal assembly. The working cylinder is equipped with a piston assembly of the utility model. The piston rod of the piston assembly extends from the oil seal assembly to the outside. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the double-sided piston valve body in an embodiment of this utility model (top view). Figure 2 This is a schematic diagram of the structure of the double-sided piston valve body in an embodiment of this utility model (view from below). Figure 3 This is a structural schematic diagram (cross-section) of the piston assembly in an embodiment of this utility model. Figure 4 This is a schematic diagram of the structure of the twin-tube vibration damper of Embodiment 1 of this utility model; Figure 5 This is a structural schematic diagram of the monotube vibration damper of Embodiment 2 of this utility model.

[0016] The markings in the attached diagram are as follows: 1-Double-sided piston valve body; 101-Upper outer valve line; 102-Upper inner valve line; 103-Lower outer valve line; 104-Lower inner valve line; 105-Return stroke oil inlet groove; 106-Compression stroke oil outlet groove; 107-Compression stroke oil inlet groove; 108-Return stroke oil outlet groove; 109-Return stroke oil passage; 109a-First inlet bend; 109b-First outlet flow path; 110-Compression stroke oil passage; 110a-Second inlet bend; 110b-Second outlet flow path; 2-Piston rod; 3-Compression stroke damping valve plate assembly; 4-Return stroke damping valve plate assembly; 5-Cylinder; 6-Guide assembly; 7-Floating piston; 8-Oil reservoir; 9-Working cylinder; 10-Bottom valve. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as the basis for determining the present invention. Contents not described in detail below are common technical knowledge or frequently used technical means in the field.

[0018] Example 1 (see Figure 1-3 ): This embodiment provides a double-sided piston valve body for a shock absorber. The upper end face of the double-sided piston valve body 1 has an upper outer valve line 101 and an upper inner valve line 102. A recovery stroke oil inlet groove 105 is provided between the upper outer valve line 101 and the upper inner valve line 102. A compression stroke oil outlet groove 106 is provided on the inner side of the upper inner valve line 102. The lower end face of the double-sided piston valve body 1 has a lower outer valve line 103 and a lower inner valve line 104. A compression stroke oil inlet groove 107 is provided between the lower outer valve line 103 and the lower inner valve line 104. A recovery stroke oil outlet groove 108 is provided on the inner side of the lower inner valve line 104. The double-sided piston valve body 1 has a set of recovery stroke oil channels 109 and compression stroke channels 109 that penetrate through its two end faces. The compression stroke oil passage 110 is provided with a return stroke oil passage 109 and a compression stroke oil passage 110 offset from each other in the circumferential direction of the valve body. The inlet of the return stroke oil passage 109 is located in the return stroke oil inlet groove 105, and its outlet is located in the return stroke oil outlet groove 108. The inlet of the compression stroke oil passage 110 is located in the compression stroke oil inlet groove 107, and its outlet is located in the compression stroke oil outlet groove 106. The return stroke oil passage 109 is composed of a streamlined first inlet bend 109a and a gradually expanding first outlet flow channel 109b. The compression stroke oil passage 110 is composed of a streamlined second inlet bend 110a and a gradually expanding second outlet flow channel 110b. The arrangement of the recovery stroke oil inlet groove 105, compression stroke oil outlet groove 106, compression stroke oil inlet groove 107, and recovery stroke oil outlet groove 108 reduces the contact area between the valve plate and the valve body, thereby reducing the adhesion between the valve plate and the valve line. In addition, the recovery stroke oil channel 109 consists of a streamlined first inlet bend 109a and a gradually widening first outlet channel 109b; the compression stroke oil channel 110 consists of a streamlined second inlet bend 110a and a gradually widening second outlet channel 110b. The combination of the streamlined inlet bend and the gradually widening outlet channel effectively reduces the eddy current phenomenon generated by the damper oil in the oil channel (abrupt changes in the channel cross-section can cause eddy currents and generate noise).

[0019] In this embodiment, the number of compression stroke oil channels 110 and recovery stroke oil channels 109 is the same, both being 5.

[0020] Both the first inlet bend 109a and the second inlet bend 110a have cross-sections that gradually expand radially in a fan shape. The valve body is made by sintering metallurgical powder, and the fact that both the first inlet bend 109a and the second inlet bend 110a have cross-sections that gradually expand radially in a fan shape makes the molding die easier to manufacture and helps control costs.

[0021] This embodiment also provides a piston assembly for a shock absorber, including a piston rod 2, and a compression stroke damping valve plate group 3, a valve body, and a recovery stroke damping valve plate group 4 sequentially disposed at the end of the piston rod 2; the valve body is the aforementioned double-sided piston valve body 1, the compression stroke damping valve plate group 3 abuts against the upper inner valve line 102, and the recovery stroke damping valve plate group 4 abuts against the lower inner valve line 104.

[0022] In addition, this embodiment also provides a shock absorber, which includes the aforementioned piston assembly.

[0023] In this embodiment, the shock absorber is a single-tube shock absorber, including a cylinder 5. An oil seal assembly 6 is provided on the top of the cylinder 5. A floating piston 7 is provided inside the cylinder 5. The floating piston 7 divides the internal space of the cylinder 5 into an oil chamber and an air chamber. The oil chamber is located on the upper side of the floating piston 7, and the air chamber is located on the lower side of the floating piston 7. A piston assembly is installed in the oil chamber. The piston rod 2 of the piston assembly extends from the oil seal assembly 6 to the outside. Example

[0024] Example 2 also provides a double-sided piston valve body, piston assembly, and a vibration damper.

[0025] Unlike Embodiment 1, in Embodiment 2, the shock absorber is a twin-tube shock absorber, including an oil reservoir 8 and a working cylinder 9 disposed inside the oil reservoir 8. The bottom of the working cylinder 9 is provided with a bottom valve 10, and the top of the working cylinder 9 is provided with an oil seal assembly 6. A piston assembly is installed inside the working cylinder 9. The piston rod 2 of the piston assembly extends from the oil seal assembly 6 to the outside.

[0026] When the shock absorber of this utility model is working, during the compression stroke, the double-sided piston valve body 1 moves downward, and the oil on the lower side of the double-sided piston valve body 1 enters the compression stroke oil passage 110, opening the compression stroke damping valve plate assembly 3, separating it from the upper inner valve line 102 to allow the oil to flow and generate damping force; during the recovery stroke, the double-sided piston valve body 1 moves upward, and the oil on the upper side of the double-sided piston valve body 1 enters the recovery stroke oil passage 109, opening the recovery stroke damping valve plate assembly 4, separating it from the lower inner valve line 104 to allow the oil to flow and generate damping force.

[0027] The foregoing general description of the utility model and its specific embodiments should not be construed as limiting the technical solution of the utility model. Those skilled in the art, based on the disclosure of this application, can add, reduce, or combine the disclosed technical features in the foregoing general description and / or specific embodiments (including examples) without departing from the constituent elements of the utility model, to form other technical solutions within the protection scope of this application.

Claims

1. A twin-sided piston valve body for a shock absorber, characterized by: The upper end face of the double-sided piston valve body (1) has an upper outer valve line (101) and an upper inner valve line (102). A recovery stroke oil inlet groove (105) is provided between the upper outer valve line (101) and the upper inner valve line (102). A compression stroke oil outlet groove (106) is provided on the inner side of the upper inner valve line (102). The lower end face of the double-sided piston valve body (1) has a lower outer valve line (103) and a lower inner valve line (104). A compression stroke oil inlet groove (107) is provided between the lower outer valve line (103) and the lower inner valve line (104). A recovery stroke oil outlet groove (108) is provided on the inner side of the lower inner valve line (104). The double-sided piston valve body (1) has a recovery stroke oil channel (109) and a compression stroke oil channel (108) arranged in groups inside, penetrating both end faces. 10) The recovery stroke oil passage (109) and the compression stroke oil passage (110) are offset in the circumferential direction of the valve body; the inlet of the recovery stroke oil passage (109) is located in the recovery stroke oil inlet groove (105), and its outlet is located in the recovery stroke oil outlet groove (108); the inlet of the compression stroke oil passage (110) is located in the compression stroke oil inlet groove (107), and its outlet is located in the compression stroke oil outlet groove (106); the recovery stroke oil passage (109) is composed of a streamlined first inlet bend (109a) and a gradually expanding first outlet flow channel (109b); the compression stroke oil passage (110) is composed of a streamlined second inlet bend (110a) and a gradually expanding second outlet flow channel (110b).

2. The twin piston valve body of a shock absorber of claim 1, wherein: The number of recovery stroke oil channels (109) is 4-6, and the number of compression stroke oil channels (110) is the same as that of recovery stroke oil channels (109).

3. The twin piston valve body of a shock absorber of claim 1, wherein: The cross-sections of the first entrance bend (109a) and the second entrance bend (110a) are both fan-shaped that gradually expands radially.

4. A piston assembly for a shock absorber, comprising a piston rod (2), and a compression stroke damping valve assembly (3), a valve body, and a recovery stroke damping valve assembly (4) sequentially disposed at the end of the piston rod (2); characterized in that: The valve body is a double-sided piston valve body (1) as described in claim 1, 2 or 3, wherein the compression stroke damping valve plate group (3) abuts against the upper inner valve line (102), and the recovery stroke damping valve plate group (4) abuts against the lower inner valve line (104).

5. A damper characterized by: Includes the piston assembly as described in claim 4.

6. The damper of claim 5, wherein: The shock absorber is a single-tube shock absorber, including a cylinder (5), an oil seal assembly (6) on the top of the cylinder (5), and a floating piston (7) inside the cylinder (5). The floating piston (7) divides the internal space of the cylinder (5) into an oil chamber and an air chamber. The oil chamber is located on the upper side of the floating piston (7), and the air chamber is located on the lower side of the floating piston (7). The piston assembly as described in claim 4 is installed in the oil chamber. The piston rod (2) of the piston assembly extends from the oil seal assembly (6) to the outside.

7. The damper of claim 5, wherein: The shock absorber is a twin-cylinder shock absorber, including an oil reservoir (8) and a working cylinder (9) located inside the oil reservoir (8). The bottom of the working cylinder (9) is provided with a bottom valve (10), and the top of the working cylinder (9) is provided with an oil seal assembly (6). The piston assembly as described in claim 4 is installed inside the working cylinder (9). The piston rod (2) of the piston assembly extends from the oil seal assembly (6) to the outside.

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