A dual valve automotive shock absorber with variable damping

Abstract

A variable damping dual-valve automotive shock absorber includes an oil reservoir. A working cylinder assembly is disposed in the oil reservoir cavity of the oil reservoir. The working cylinder assembly includes a working cylinder. A recovery cylinder is disposed between the front end of the outer circumference of the working cylinder and the inner wall of the oil reservoir. A recovery solenoid valve is connected to the recovery cylinder. A compression cylinder is disposed between the rear end of the outer circumference of the working cylinder and the inner wall of the oil reservoir. A compression solenoid valve is connected to the compression cylinder. The bottom end of the working cylinder is connected and fixed to a bottom valve assembly. The outer side of the lower end of the working cylinder is connected and fixed to both the recovery solenoid valve and the compression solenoid valve. The lower end of the recovery solenoid valve is connected to the recovery cylinder through a one-way valve assembly. The lower end of the one-way valve assembly extends into the recovery cylinder. The one-way valve assembly and the outer wall of the recovery cylinder are sealed by a first sealing ring. The lower end of the compression solenoid valve is connected to the compression cylinder through a connecting sealing post. The lower end of the connecting sealing post extends into the compression cylinder. The connecting sealing post and the outer wall of the compression cylinder are sealed by a second sealing ring.

Description

Technical Field

[0001] This invention relates to the field of automotive shock absorbers, and more specifically to a dual-valve automotive shock absorber with variable damping. Background Technology

[0002] Currently, dual-valve shock absorbers consist of components such as piston rod assemblies, oil reservoir assemblies, working cylinder assemblies, one-way valve assemblies, and solenoid valve assemblies. Although they allow for separate and independent adjustment of the restoring and compression damping forces, their internal structure is complex, and the internal shock absorber space design is limited. Furthermore, the excessively high axial installation height from the solenoid valve end face to the center line of the oil reservoir results in high space requirements for installing the shock absorber in the vehicle body. Additionally, the flanged hole structure of the restoring and compression cylinders, with the included angle between the two cylinders ranging from 0° to 180°, necessitates a requirement for the inner diameter of the oil reservoir when installing the working cylinder assembly; otherwise, proper assembly is impossible, thus increasing the diameter of the oil reservoir. The one-way valve assembly is mounted on the plane of the solenoid valve seat for limiting movement. This structure leads to complex valve seat and solenoid valve seat structures, increasing component costs and manufacturing difficulty, while also increasing the axial installation height of the solenoid valve assembly. This makes it difficult to promote the use of dual-valve shock absorbers in projects with limited vehicle body installation space. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a dual-valve automotive shock absorber with variable damping.

[0004] The objective of this invention is achieved through the following solution: a dual-valve automotive shock absorber with variable damping, comprising an oil reservoir, a working cylinder assembly disposed within the oil reservoir cavity of the oil reservoir, the working cylinder assembly comprising a working cylinder, a piston rod assembly disposed within the working cylinder, a recovery cylinder disposed between the outer circumferential front end of the working cylinder and the inner wall of the oil reservoir, a recovery solenoid valve communicating with the recovery cylinder, a through hole provided at the front end of the working cylinder communicating with the recovery cylinder, a compression cylinder disposed between the outer circumferential rear end of the working cylinder and the inner wall of the oil reservoir, a compression solenoid valve communicating with the compression cylinder, and a through hole provided at the rear circumference of the working cylinder. The hole is connected to the compression cylinder. The bottom end of the working cylinder is connected and fixed to the bottom valve assembly. The outer side of the lower end of the working cylinder is connected and fixed to the recovery solenoid valve and the compression solenoid valve respectively. The lower end of the recovery solenoid valve is connected to the recovery cylinder through the one-way valve assembly. The lower end of the one-way valve assembly extends into the recovery cylinder. The one-way valve assembly and the outer wall of the recovery cylinder are sealed by the first sealing ring. The lower end of the compression solenoid valve is connected to the compression cylinder through the connecting sealing column. The lower end of the connecting sealing column extends into the compression cylinder. The connecting sealing column and the outer wall of the compression cylinder are sealed by the second sealing ring.

[0005] The one-way valve assembly includes a valve cover and a valve seat. A wave spring and a valve plate are disposed between the valve cover and the valve seat. The valve cover has a valve cover through hole in the center axially. A valve cover groove is disposed on the outer side of the upper end of the valve cover through hole. An upward valve cover protrusion is disposed on the outer circumference of the valve cover groove. The valve cover protrusion seals the one-way valve assembly and the recovery solenoid valve. A downward valve cover protrusion is disposed on the outer side of the lower end of the valve cover through hole. The wave spring is disposed between the valve cover protrusion and the inner wall of the valve cover. The lower end of the valve seat is a small diameter section, and the upper end of the valve seat is a large diameter section. A valve seat through hole is disposed in the center axially. Multiple annular grooves for oil inlet are disposed on the outer side of the large diameter section of the valve seat. A flange extends outward from the lower circumference of the large diameter section of the valve seat. The outer side of the large diameter section of the valve seat is press-fitted with the inner wall of the valve cover. A sealing ring mounting groove is disposed on the lower end face of the small diameter section of the valve seat. A first sealing ring is installed in the sealing ring mounting groove. A connecting protrusion extends downward from the lower end of the small diameter section of the valve seat and extends into the recovery cylinder.

[0006] The connecting sealing column has a central axial through hole, and the lower end of the connecting sealing column has a stepped surface that fits against the outer wall of the compression cylinder. The end face of the stepped surface has a second sealing ring mounting groove, and the second sealing ring is installed in the second sealing ring mounting groove. The lower end of the connecting sealing column has a downward connecting boss that extends into the compression cylinder. The upper outer side of the sealing column through hole has a sealing column groove, and the outer circumference of the sealing column groove has an upward sealing column protrusion.

[0007] The lower outer circumference of the oil reservoir is provided with a restoration solenoid valve seat and a compression solenoid valve seat. The lower end of the restoration solenoid valve is threadedly connected to the inner wall of the restoration solenoid valve seat, and the compression solenoid valve is threadedly connected to the inner wall of the compression solenoid valve seat.

[0008] The bottom end of the working cylinder is interference-fitted with the bottom valve assembly, and the arc surface of the bottom valve assembly is in contact with the bottom valve seat.

[0009] The front circumference of the working cylinder has four through holes that connect to the recovery cylinder, and the rear circumference of the working cylinder has four through holes that connect to the compression cylinder.

[0010] The advantages of this invention are: 1. The flange holes are eliminated in the recovery cylinder and the compression cylinder, and the inner diameter of the oil tank required for the working cylinder assembly to enter the oil storage tank is reduced, thereby reducing the diameter of the oil storage tank; 2. The flange holes of the recovery and compression cylinders are eliminated, and the one-way valve and sealing column structures are optimized. At the same time, the structure of the recovery / compression solenoid valve seat is optimized, thereby reducing the axial installation height of the recovery / compression solenoid valve, which is conducive to the promotion and application of dual-valve shock absorbers in main engine projects with limited vehicle body space. 3. The piston divides the working cylinder into an upper chamber and a lower chamber, with separate recovery / compression oil circuit control. A one-way valve replenishes oil to the upper working chamber, realizing the decoupling of recovery / compression damping and enabling independent regulation of damping force by dual valves, thus contributing to the vehicle's superior driving and handling performance. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is an enlarged schematic diagram of the connection structure between two solenoid valves. Figure 3 This is a schematic diagram of a one-way valve structure; Figure 4 This is a schematic diagram of the valve cover and valve seat structure; Figure 5 This is a schematic diagram of the connecting sealing column structure; Figure 6 This is a bottom view of the valve seat. Detailed Implementation

[0012] like Figures 1 to 6As shown, a dual-valve automotive shock absorber with variable damping includes an oil reservoir 2. A working cylinder assembly is disposed in the oil reservoir cavity of the oil reservoir 2. The working cylinder assembly includes a working cylinder 3 and a piston rod assembly 1 disposed in the working cylinder 3. A recovery cylinder 4 is disposed between the front end of the outer circumference of the working cylinder 3 and the inner wall of the oil reservoir 2. A recovery solenoid valve 6 is connected to the recovery cylinder 4. The front end of the working cylinder 3 is provided with four through holes connected to the recovery cylinder 4. A compression cylinder 16 is disposed between the rear end of the outer circumference of the working cylinder 3 and the inner wall of the oil reservoir 2. A compression solenoid valve 13 is connected to the compression cylinder 16. The rear end of the working cylinder 3 is provided with four through holes connected to the compression cylinder 16. The bottom end of the working cylinder 3 is connected and fixed to a bottom valve assembly. The bottom end of the working cylinder 3 and the bottom valve assembly are interference-fitted. The arc surface of the bottom valve assembly and the bottom valve seat are mutually fitted. The lower outer side of the working cylinder 3 is respectively connected and fixed to the recovery solenoid valve 6 and the compression solenoid valve 13. The lower outer circumference of the oil reservoir 2 is provided with a recovery solenoid valve seat 5 and a compression solenoid valve seat 12. The lower end of the recovery solenoid valve 6 is threadedly connected to the inner wall of the recovery solenoid valve seat 5, and the compression solenoid valve 13 is threadedly connected to the inner wall of the compression solenoid valve seat 12. The lower end of the recovery solenoid valve 6 is connected to the recovery cylinder 4 through a one-way valve assembly. The lower end of the one-way valve assembly extends into the recovery cylinder 4. The one-way valve assembly and the outer wall of the recovery cylinder 4 are sealed by a first sealing ring 7. The one-way valve assembly includes a valve cover 11 and a valve seat 8. The valve cover 11 and the valve seat 8 are made of powder metallurgy or metal material. A wave spring 10 and a valve plate 9 are provided between the valve cover 11 and the valve seat 8. A valve cover through hole 11-2 is provided axially in the center of the valve cover 11. A valve cover groove is provided on the upper outer side of valve cover 1-2. An upward-facing valve cover protrusion 11-1 is provided on the outer circumference of the valve cover groove. The valve cover protrusion 11-1 seals the one-way valve assembly and the reset solenoid valve 6. A downward-facing lower valve cover protrusion 11-3 is provided on the lower outer side of valve cover through hole 11-2. Wave spring 10 is disposed between the lower valve cover protrusion 11-3 and the inner wall of valve cover. The lower end of valve seat 8 is a small-diameter section, and the upper end of valve seat 8 is a large-diameter section. A valve seat through hole 8-3 is provided axially in the center of valve seat 8. The valve seat 8 has multiple annular grooves 8-5 for oil inlet axially arranged on the outer side of its large-diameter section. A flange extends outward from the lower circumference of the large-diameter section of the valve seat 8. The outer side of the large-diameter section of the valve seat 8 is press-fitted with the inner wall of the valve cover 11. A sealing ring mounting groove 8-2 is provided on the lower end face of the small-diameter section of the valve seat 8. The first sealing ring 7 is installed in the sealing ring mounting groove 8-2. The lower end face of the small-diameter section of the valve seat 8 is in contact with the outer wall of the recovery cylinder 4. A connecting protrusion 8-4 extends downward from the lower end of the small-diameter section of the valve seat 8, extending into the recovery cylinder 4. The outer wall of the recovery cylinder 4 and the recovery solenoid valve 6 axially limit the one-way valve assembly. The valve cover through hole 11-2 and the valve seat through hole 8-3 communicate with the oil inlet of the recovery solenoid valve 6 and the inner cavity of the recovery cylinder 4. When the recovery solenoid valve 6 is installed, the one-way valve assembly is squeezed, and the valve cover protrusion 11-1 and the first sealing ring 7 deform to achieve a seal.The lower end of the compression solenoid valve 13 is connected to the compression cylinder 16 through the connecting sealing column 14. The lower end of the connecting sealing column 14 extends into the compression cylinder 16, and the connecting sealing column 14 and the outer wall of the compression cylinder 16 are sealed by the second sealing ring 15. The connecting sealing column 14 has a central axially arranged sealing column through hole 14-2. The lower end of the connecting sealing column 14 has a stepped surface 14-4 that fits against the outer wall of the compression cylinder 16. The end face of the stepped surface 14-4 has a second sealing ring mounting groove 14-3. The second sealing ring 15 is installed in the second sealing ring mounting groove 14-3. The lower end of the connecting sealing column 14 has a centrally arranged downward connecting boss 14-5 that extends into the compression cylinder 16. The outer wall of the compression cylinder 16 and the compression solenoid valve 13 axially limit the connecting sealing column 14. The upper outer side of the sealing column through hole 14-2 has a sealing column groove. The outer circumference of the sealing column groove has an upwardly arranged sealing column protrusion 14-1. The sealing column through hole 14-2 connects the compression solenoid valve 13 and the compression cylinder 16. When the compression solenoid valve 13 is installed, it squeezes the connecting sealing column 14. The sealing column protrusion 14-1 and the second sealing ring 15 deform to achieve a seal.

[0013] During the shock absorber's recovery stroke, the volume of the upper chamber of the working cylinder decreases, and some oil enters the recovery middle cylinder cavity through the four through holes at the upper end of the working cylinder. It then flows through the through hole of the one-way valve assembly and enters the recovery solenoid valve. The recovery solenoid valve adjusts the recovery damping force according to the input current. A portion of the oil in the upper chamber enters the lower chamber of the working cylinder through the throttle valve plate on the piston assembly. The volume of the lower chamber of the working cylinder increases, and the oil in the oil storage chamber enters the lower chamber of the working cylinder through the bottom valve assembly channel. A portion of the oil enters the compression middle cylinder cavity through the four through holes at the lower end of the working cylinder, flows through the through hole of the connecting sealing column, and enters the compression solenoid valve. The compression solenoid valve adjusts the compression damping force according to the input current. During the compression stroke of the shock absorber, the volume of the upper chamber of the working cylinder increases, and some oil enters the recovery cylinder chamber through the four through holes at the upper end of the working cylinder. It then flows through the through hole of the one-way valve assembly into the recovery solenoid valve, which adjusts the recovery damping force according to the input current. When the one-way valve assembly opens, oil from the reservoir chamber enters the upper chamber of the working cylinder through the one-way valve assembly. Conversely, the volume of the lower chamber of the working cylinder decreases, and some oil enters the reservoir chamber through the bottom valve assembly channel, while some oil enters the compression cylinder chamber through the four through holes at the lower end of the working cylinder. It then flows through the through hole of the connecting sealing column into the compression solenoid valve, which adjusts the compression damping force according to the input current. This type of shock absorber achieves decoupling of recovery and compression damping, enabling independent control of damping force by dual valves, contributing to the vehicle's superior ride and handling performance.

[0014] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications made to the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope of the present invention.

Claims

1. A dual-valve automotive shock absorber with variable damping, comprising an oil reservoir (2), a working cylinder assembly being disposed in the oil reservoir cavity of the oil reservoir (2), the working cylinder assembly comprising a working cylinder (3), a piston rod assembly (1) disposed in the working cylinder (3), a recovery cylinder (4) being disposed between the outer circumferential front end of the working cylinder (3) and the inner wall of the oil reservoir (2), a recovery solenoid valve (6) being connected to the recovery cylinder (4), a through hole being disposed at the front end of the working cylinder (3) being connected to the recovery cylinder (4), a compression cylinder (16) being disposed between the outer circumferential rear end of the working cylinder (3) and the inner wall of the oil reservoir (2), a compression solenoid valve (13) being connected to the compression cylinder (16), a through hole being disposed at the rear circumferential end of the working cylinder (3) being connected to the compression cylinder (16), and the bottom end of the working cylinder (3) being connected and fixed to a bottom valve assembly, characterized in that: The lower outer side of the working cylinder (3) is connected and fixed to the recovery solenoid valve (6) and the compression solenoid valve (13) respectively. The lower end of the recovery solenoid valve (6) is connected to the recovery cylinder (4) through a one-way valve assembly. The lower end of the one-way valve assembly extends into the recovery cylinder (4). The one-way valve assembly and the outer wall of the recovery cylinder (4) are sealed by the first sealing ring (7). The lower end of the compression solenoid valve (13) is connected to the compression cylinder (16) through a connecting sealing column (14). The lower end of the connecting sealing column (14) extends into the compression cylinder (16). The connecting sealing column (14) and the outer wall of the compression cylinder (16) are sealed by the second sealing ring (15).

2. The variable damping dual-valve automotive shock absorber according to claim 1, characterized in that: The one-way valve assembly includes a valve cover (11) and a valve seat (8). A wave spring (10) and a valve plate (9) are arranged between the valve cover (11) and the valve seat (8). A valve cover through hole (11-2) is axially arranged in the center of the valve cover (11). A valve cover groove is arranged on the outer side of the upper end of the valve cover through hole (11-2). An upward valve cover protrusion (11-1) is arranged on the outer circumference of the valve cover groove. The valve cover protrusion (11-1) seals the one-way valve assembly and the reset solenoid valve (6). A downward valve cover lower protrusion (11-3) is arranged on the outer side of the lower end of the valve cover through hole (11-2). The wave spring (10) is arranged between the valve cover lower protrusion (11-3) and the inner wall of the valve cover. The lower end of the valve seat (8) is a small diameter section, and the upper end of the valve seat (8) is a large diameter section. A valve seat through hole (8-3) is axially arranged in the center of the valve seat (8). The valve seat (8) has multiple annular grooves (8-5) for oil inlet on the outer side of the large diameter section. The valve seat (8) has a flange extending outward from the lower circumference of the large diameter section. The outer side of the large diameter section of the valve seat (8) is press-fitted with the inner wall of the valve cover (11). The valve seat (8) has a sealing ring mounting groove (8-2) on the lower end face of the small diameter section. The first sealing ring (7) is installed in the sealing ring mounting groove (8-2). The lower end of the small diameter section of the valve seat (8) extends downward to connect the protrusion (8-4). The connecting protrusion (8-4) extends into the recovery cylinder (4).

3. The variable damping dual-valve automotive shock absorber according to claim 1, characterized in that: The connecting sealing column (14) has a central axial sealing column through hole (14-2). The lower end of the connecting sealing column (14) has a stepped surface (14-4) that fits against the outer wall of the compression cylinder (16). The end face of the stepped surface (14-4) has a second sealing ring mounting groove (14-3). The second sealing ring (15) is installed in the second sealing ring mounting groove (14-3). The lower end of the connecting sealing column (14) has a central axial downward connecting boss (14-5) that extends into the compression cylinder (16). The upper outer side of the sealing column through hole (14-2) has a sealing column groove. The outer circumference of the sealing column groove has an upward sealing column protrusion (14-1).

4. The variable damping dual-valve automotive shock absorber according to claim 1, characterized in that: The lower outer circumference of the oil reservoir (2) is provided with a restoration solenoid valve seat (5) and a compression solenoid valve seat (12). The lower end of the restoration solenoid valve (6) is threadedly connected to the inner wall of the restoration solenoid valve seat (5), and the compression solenoid valve (13) is threadedly connected to the inner wall of the compression solenoid valve seat (12).

5. The variable damping dual-valve automotive shock absorber according to claim 1, characterized in that: The bottom end of the working cylinder (3) is press-fitted with the bottom valve assembly, and the arc surface of the bottom valve assembly and the bottom valve seat are in mutual cooperation.

6. The variable damping dual-valve automotive shock absorber according to claim 1, characterized in that: The working cylinder (3) has four through holes on its front circumference that are connected to the recovery cylinder (4), and the working cylinder (3) has four through holes on its rear circumference that are connected to the compression cylinder (16).

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