Working cylinder assembly of electronically controlled shock absorber and electronically controlled shock absorber adopting the assembly

Abstract

The application provides a working cylinder assembly of an electric control shock absorber and the electric control shock absorber adopting the working cylinder assembly. In the scheme of the application, the upper end of the working cylinder (1) has a flared structure to form a step surface, and the flow leakage hole (101) is located on the step surface; the upper end of the working cylinder (1) is located in the intermediate cylinder (2) and is fixedly connected with the inner wall of the intermediate cylinder (2) through interference fit; the lower end of the intermediate cylinder (2) has a necked structure, the lower end of the working cylinder (1) protrudes relative to the lower end of the intermediate cylinder (2), and the lower end of the intermediate cylinder (2) is fixedly connected with the outer wall of the working cylinder (1) and is sealed. Compared with the prior art, the working cylinder and the intermediate cylinder adopt specific structural design, and the two form the working cylinder assembly. In the assembly process of the shock absorber, the sealing ring and the piston ring cannot cause scratches, so that the leakage caused by the scratches of the sealing ring and / or the piston ring is effectively avoided; and the working cylinder assembly is easy to manufacture, the parts have strong universality, and the required parts are few.

Description

Technical Field

[0001] This invention relates to vibration dampers, and more specifically to a working cylinder assembly of an electronically controlled vibration damper and an electronically controlled vibration damper using such an assembly. Background Technology

[0002] In recent years, electronically controlled vibration dampers have received widespread attention in the industry, with OEMs and vibration damper companies vying to develop them. External solenoid valves are the mainstream form of electronically controlled vibration dampers, which are divided into single-valve and dual-valve types. Compared to traditional passive vibration dampers, electronically controlled vibration dampers with external solenoid valves have a passage from the working cylinder to the solenoid valve. This involves setting a vent hole on the traditional working cylinder, then fitting an intermediate cylinder onto the working cylinder. The intermediate cylinder has a solenoid valve flow hole. Oil from the working cylinder is led to the solenoid valve through the holes in the working cylinder and the intermediate cylinder, allowing adjustment of the damping force by regulating the solenoid valve opening.

[0003] Based on this, people have tried to come up with some methods to prevent the sealing ring and piston ring from contacting the edge of the drain hole: one is to process chamfers on the inner and outer edges of the hole, but this requires thicker pipe walls and higher processing precision, and is also more expensive, which is not currently supported by domestic processing capabilities; the other is to press indentations on the inner and outer edges of the hole, but this method cannot completely eliminate sharp edges and burrs, and the shape and depth of the indentation have a great impact on the effect. In addition, since it is formed by pressing, when an indentation is pressed on one side, the material will deform in the opposite direction, which greatly affects the anti-scratching effect on the other side, and the effect is minimal. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, this invention provides a working cylinder assembly for an electronically controlled vibration damper and an electronically controlled vibration damper employing this working cylinder assembly. In the technical solution of this application, the working cylinder and intermediate cylinder adopt a specific structural design, which is not only easy to manufacture, but also prevents scratches on the sealing rings and piston rings during damper assembly, thereby effectively avoiding leakage caused by scratches from sharp edges or burrs on the edges of the vent holes on the sealing rings and / or piston rings. Furthermore, using the solution of this invention, within a certain stroke range, only the pressing amount of the working cylinder needs to be changed according to different strokes; the lengths of the working cylinder and intermediate cylinder can remain constant, resulting in strong parts versatility and helping to control manufacturing costs. In addition, using the solution of this invention requires fewer parts, which also helps to control manufacturing costs.

[0005] For single-valve electronically controlled vibration dampers, this application provides the following technical solution: A single-valve electrically controlled vibration damper working cylinder assembly includes a working cylinder and an intermediate cylinder; the working cylinder is provided with a vent hole, and the intermediate cylinder is provided with a solenoid valve flow hole; the intermediate cylinder is sleeved outside the working cylinder, and the space between the working cylinder and the intermediate cylinder is a vent chamber; the vent hole connects the upper chamber of the working cylinder with the vent chamber, and the solenoid valve flow hole allows oil in the vent chamber to flow into the solenoid valve; the upper end of the working cylinder has a flared structure, forming a stepped surface; the vent hole is located on this stepped surface; the upper end of the working cylinder is located inside the intermediate cylinder and is fixedly connected to the inner wall of the intermediate cylinder by an interference fit; the lower end of the intermediate cylinder has a constricted structure, and the lower end of the working cylinder extends relative to the lower end of the intermediate cylinder, and the lower end of the intermediate cylinder is fixedly connected to and sealed to the outer wall of the working cylinder.

[0006] Compared with the prior art, the working cylinder assembly of the single-valve electronically controlled vibration damper of the present invention has the following significant improvements: 1) A completely new design structure is adopted, in which the upper end of the working cylinder has a flared structure to form a stepped surface, and the drain hole is located on the stepped surface. Since the drain hole is located on the stepped surface formed after the flare, the sealing ring on the intermediate cylinder and the piston ring on the piston will not normally contact the edge of the drain hole during assembly, thereby effectively avoiding the sealing ring on the intermediate cylinder and / or the piston ring on the piston being scratched by the sharp edge or burrs of the drain hole, thus avoiding leakage caused by this. 2) With the solution of the present invention, since the sealing ring on the intermediate cylinder and the piston ring on the piston will not normally contact the edge of the drain hole during assembly, only one processing with a flaring die is required after punching (drilling) the hole. There is no need to treat the sharpening and burrs on the edge of the drain hole. In the prior art, after punching (drilling) the working cylinder, each hole needs to be further processed to reduce the impact of sharpening and burrs. It can be seen that the solution of the present invention can make the manufacturing process simpler. 3) In the prior art, the lengths of the working cylinder and the intermediate cylinder must be changed according to the different strokes of the shock absorber. With the solution of the present invention, within a certain stroke range, only the pressing amount of the working cylinder needs to be changed according to the different strokes. The lengths of the working cylinder and the intermediate cylinder body can remain unchanged. The parts have strong versatility and are conducive to controlling manufacturing costs.

[0007] 4) By adopting the solution of the present invention, the upper part of the working cylinder is directly press-fitted with the intermediate cylinder, which reduces the use of sealing rings and retaining rings, and also helps to control manufacturing costs.

[0008] As an optimization, in the aforementioned single-valve electronically controlled vibration damper's working cylinder assembly, the lower end of the intermediate cylinder is provided with an annular sealing groove. A sealing ring and a retaining ring are provided in the annular sealing groove, with the retaining ring located below the sealing ring. This design ensures a reliable seal and is easy to implement. The retaining ring prevents misalignment of the sealing ring during assembly, guaranteeing that the sealing ring is positioned within the annular sealing groove after assembly.

[0009] Furthermore, the manufacturing process of the working cylinder assembly includes the following steps: S1. A drain hole is machined on the upper part of the working cylinder blank, and then the upper part of the working cylinder is flared so that the drain hole is located on the stepped surface formed by the flaring, thus obtaining the working cylinder. S2, the lower end of the intermediate cylinder blank is narrowed and grooved to form an annular sealing groove, thus obtaining the intermediate cylinder; S3. First, install the sealing ring and retaining ring into the annular sealing groove, and then press the working cylinder into the intermediate cylinder from the top of the intermediate cylinder until the set position is reached.

[0010] Manufacturing the working cylinder assembly using the above process steps is conducive to industrialization.

[0011] Furthermore, in step S1, a vent hole is obtained by punching from the inside out. This ensures that the inner edge of the vent hole has no exposed sharp edges or burrs, further reducing the risk of the piston rings being scratched during assembly.

[0012] Correspondingly, the present invention also provides a single-valve electrically controlled vibration damper, which adopts the working cylinder assembly of the present invention described above; the upper end of the intermediate cylinder is connected to a guide, and the lower end of the working cylinder is connected to a compression bottom valve.

[0013] Compared with the prior art, the single-valve electronically controlled vibration damper of the present invention adopts a new structure for the working cylinder assembly, which is not only easy to manufacture, but also solves the problem that the sealing ring on the intermediate cylinder and the piston ring on the piston are easily scratched by the sharp edge or burr of the vent hole during assembly; at the same time, it has the advantages of strong part versatility and a small number of required parts, which is conducive to controlling manufacturing costs.

[0014] For dual-valve electronically controlled vibration dampers, the present invention provides the following technical solution: A dual-valve electronically controlled vibration damper's working cylinder assembly includes a working cylinder and an intermediate cylinder. The upper part of the working cylinder has a recovery vent hole, and the lower part has a compression vent hole. The upper part of the working cylinder has a flared structure, forming a stepped surface. The recovery vent hole is located on this stepped surface. The upper end of the working cylinder is located inside the intermediate cylinder and is fixedly connected to the inner wall of the intermediate cylinder via an interference fit. The lower end of the intermediate cylinder has a constricted structure, and the lower end of the working cylinder extends relative to the lower end of the intermediate cylinder. The lower end of the intermediate cylinder is fixedly connected to and sealed to the outer wall of the working cylinder. The space between the cylinders forms a venting chamber; within the venting chamber, near the compression venting hole, a sealing partition is provided; the sealing partition divides the venting chamber into a restoration venting chamber and a compression venting chamber, the restoration venting hole connects the upper chamber of the working cylinder to the restoration venting chamber, and the compression venting hole connects the lower chamber of the working cylinder to the compression venting chamber; the intermediate cylinder is provided with a restoration solenoid valve flow hole and a compression solenoid valve flow hole, the restoration solenoid valve flow hole allows oil in the restoration venting chamber to flow into the restoration solenoid valve, and the compression solenoid valve flow hole allows oil in the compression venting chamber to flow into the compression solenoid valve.

[0015] Compared with the prior art, the working cylinder assembly of the dual-valve electronically controlled shock absorber of the present invention adopts a completely new design structure, achieving the following significant improvements: 1) A completely new design structure is adopted, in which the upper end of the working cylinder has a flared structure to form a stepped surface, and the drain hole is located on the stepped surface. Since the drain hole is located on the stepped surface formed by the flared structure, the sealing ring on the intermediate cylinder and the piston ring on the piston will not normally contact the edge of the drain hole during assembly, thereby effectively avoiding the sealing ring on the intermediate cylinder and / or the piston ring on the piston being scratched by the sharp edge or burrs of the drain hole, thus avoiding leakage caused by this. 2) With the solution of the present invention, since the sealing ring on the intermediate cylinder and the piston ring on the piston will not normally contact the edge of the drain hole during assembly, only one processing with a flaring die is required after punching (drilling) the hole. There is no need to treat the sharpening and burrs on the edge of the drain hole. In the prior art, after punching (drilling) the working cylinder, each hole needs to be further processed to reduce the impact of sharpening and burrs. It can be seen that the solution of the present invention can make the manufacturing process simpler. 3) In the prior art, the lengths of the working cylinder and the intermediate cylinder must be changed according to the different strokes of the shock absorber. With the solution of the present invention, within a certain stroke range, only the pressing amount of the working cylinder needs to be changed according to the different strokes. The lengths of the working cylinder and the intermediate cylinder body can remain unchanged. The parts have strong versatility and are conducive to controlling manufacturing costs.

[0016] 4) By adopting the solution of the present invention, the working cylinder is reduced to one, and the discharge chamber is divided into two independent parts by setting a sealing partition. The upper part of the working cylinder is directly interference-fitted with the middle cylinder, which reduces the use of parts and is also conducive to controlling manufacturing costs. In addition, with this design, the two solenoid valves can be arranged more closely, thereby making the application range wider.

[0017] As an optimization, in the aforementioned dual-valve electronically controlled vibration damper's working cylinder assembly, the lower end of the intermediate cylinder is provided with an annular sealing groove, in which a sealing ring and a retaining ring are provided, with the retaining ring located below the sealing ring; the working cylinder is machined with two grooves, each with a retaining spring, and a partition sealing ring is provided between the two retaining springs, thereby forming a sealing partition. This structure not only provides a reliable seal but also facilitates industrial implementation.

[0018] Furthermore, the manufacturing process of the working cylinder assembly includes the following steps: S1. Machining a restoration vent hole and a compression vent hole on the working cylinder blank, and flaring the upper part so that the restoration vent hole is located on the stepped surface formed by the flaring; and machining two grooves near the compression vent hole to obtain the working cylinder. S2, the intermediate cylinder blank is made by shrinking the opening and grooving at the lower end of the intermediate cylinder blank; S3. Install snap rings and partition seals in sequence on the working cylinder, so that there is one snap ring in each of the two grooves, and the partition seal is placed between the two snap rings; install the seal and retaining ring in the annular sealing groove of the intermediate cylinder; then, press the working cylinder into the intermediate cylinder from the top of the intermediate cylinder until the set position is reached.

[0019] The above process steps are reasonably designed and conducive to industrialization.

[0020] Furthermore, in step S1, a restored vent hole is obtained by punching from the inside out. This ensures that the inner edge of the vent hole has no exposed sharp edges or burrs, further reducing the risk of the piston rings being scratched during assembly.

[0021] Correspondingly, the present invention also provides a dual-valve electronically controlled vibration damper, which adopts the working cylinder assembly of the present invention described above; the upper end of the intermediate cylinder is connected to a guide, and the lower end of the working cylinder is connected to a compression bottom valve.

[0022] Compared with the prior art, the working cylinder assembly of the dual-valve electronically controlled vibration damper of the present invention adopts a completely new design structure, which is not only easy to manufacture, but also solves the problem that the sealing ring on the intermediate cylinder and the piston ring on the piston are easily scratched by the sharp edges and burrs of the vent hole during assembly; at the same time, it has the advantages of strong part versatility and fewer required parts, which is conducive to controlling manufacturing costs; in addition, the two solenoid valves can be arranged more closely, thus making it more widely applicable. Attached Figure Description

[0023] Figure 1 This is a structural diagram of the working cylinder assembly of a single-valve electronically controlled vibration damper in the prior art (for ease of understanding, the piston assembly is shown in the diagram). Figure 2 This is a schematic diagram of the working cylinder assembly of the single-valve electronically controlled vibration damper in Embodiment 1 of the present invention (for ease of understanding, the piston assembly is shown in the figure). Figure 3 This is a schematic diagram of the assembly method of the working cylinder assembly in Embodiment 1 of the present invention (step S3 in Embodiment 1); Figure 4 This is a schematic diagram of the single-valve electrically controlled vibration damper in Embodiment 1 of the present invention; Figure 5 This is a structural diagram of the working cylinder assembly of a dual-valve electronically controlled shock absorber in the prior art (for ease of understanding, the piston assembly is shown in the diagram). Figure 6 This is a schematic diagram of the working cylinder assembly of the dual-valve electronically controlled vibration damper in Embodiment 2 of the present invention (for ease of understanding, the piston assembly is shown in the figure). Figure 7 This is a schematic diagram of the structure of the dual-valve electrically controlled vibration damper in Embodiment 2 of the present invention; Figure 8 This is a schematic diagram of the assembly method of the working cylinder assembly in Embodiment 2 of the present invention (step S3 in Embodiment 2).

[0024] Reference numerals: 1-Working cylinder, 101-Drain hole, 102-Restoration drain hole, 103-Compression drain hole, -groove; 2-Intermediate cylinder, 201-Solenoid valve flow hole, 202-Annular sealing groove, 203-Restoration solenoid valve flow hole, 204-Compression solenoid valve flow hole; 3-Sealing ring; 4-Retaining ring; 5-Sealing partition, 501-Snap ring, 502-Partition sealing ring; 6-Guide; 7-Compression bottom valve; 8-Reservoir; 9-Piston; 10-Restoration solenoid valve seat; 11-Compression solenoid valve seat. Detailed Implementation

[0025] The technical solution of the present invention will be further described in detail below through specific embodiments, but these should not be construed as limiting the present invention. Content not described in detail below or structures not shown in the accompanying drawings are all common knowledge in the art.

[0026] See Figure 1In the prior art, in the working cylinder assembly of a single-valve electrically controlled vibration damper, the intermediate cylinder 2 is sleeved outside the working cylinder 1, and both ends of the intermediate cylinder 2 have a constricted structure that is fixedly connected to and sealed to the outer wall of the working cylinder 1. The working cylinder 1 is a straight cylinder with a constant diameter. During assembly, the piston ring on the piston 9 and the sealing ring on the intermediate cylinder 2 are easily scratched by the burrs on the edge of the vent hole 101 when passing through it, causing leakage. To address this problem, the present invention provides a working cylinder assembly for a single-valve electrically controlled vibration damper with a novel structure, and a single-valve vibration damper using this working cylinder assembly, which will be described below with reference to Embodiment 1.

[0027] Embodiment 1 of the present invention (see Figure 2-4 ): This embodiment provides a single-valve electronically controlled vibration damper, which adopts a working cylinder assembly with a novel structure.

[0028] Similar to existing technologies, the working cylinder assembly includes a working cylinder 1 and an intermediate cylinder 2. The working cylinder 1 is provided with a drain hole 101, and the intermediate cylinder 2 is provided with a solenoid valve flow hole 201. The intermediate cylinder 2 is sleeved outside the working cylinder 1, and the space between the working cylinder 1 and the intermediate cylinder 2 is a drain chamber. The drain hole 101 connects the upper chamber of the working cylinder 1 (the upper side of the piston 9 is the upper chamber, and the lower side is the lower chamber) with the drain chamber, and the solenoid valve flow hole 201 allows the oil in the drain chamber to flow into the solenoid valve.

[0029] Unlike existing technologies: In this embodiment, the upper end of the working cylinder 1 has a flared structure, forming a stepped surface; the drain hole 101 is located on this stepped surface; the upper end of the working cylinder 1 is located inside the intermediate cylinder 2 and is fixedly connected to the inner wall of the intermediate cylinder 2 through an interference fit; the lower end of the intermediate cylinder 2 has a constricted structure, the lower end of the working cylinder 1 extends relative to the lower end of the intermediate cylinder 2, and the lower end of the intermediate cylinder 2 is fixedly connected to and sealed to the outer wall of the working cylinder 1. With the above structure, during assembly, the piston ring on the piston 9 will not contact the sharp edge and burrs of the drain hole 101, and the sealing ring on the intermediate cylinder 2 will not pass through the drain hole 101, thus avoiding scratches. In this embodiment, due to the special structural design of the working cylinder assembly, after the shock absorber is assembled, the upper end of the intermediate cylinder 2 is connected to the guide 6, and the lower end of the working cylinder 1 is connected to the compression bottom valve 7. (In the prior art, its structure dictates that the guide 6 needs to be connected to the upper end of the working cylinder 1.) In this embodiment, in order to achieve reliable sealing and ease of implementation, the lower end of the intermediate cylinder 2 is provided with an annular sealing groove 202, and the annular sealing groove 202 is provided with a sealing ring 3 (an O-ring in this embodiment) and a retaining ring 4, with the retaining ring 4 located below the sealing ring 3.

[0030] In this embodiment, the manufacturing process of the working cylinder assembly includes the following steps: S1. A drain hole 101 is machined on the upper part of the working cylinder blank (i.e., the tube material used to manufacture the working cylinder 1). (In this embodiment, the drain hole 101 is obtained by punching from the inside to the outside.) Then, the upper part of the working cylinder 1 is flared so that the drain hole 101 is located on the stepped surface formed by the flaring, and the working cylinder 1 is obtained. S2, the lower end of the intermediate cylinder blank (i.e. the tube material used to manufacture the intermediate cylinder 2) is narrowed and grooved to form an annular sealing groove 202, thus obtaining the intermediate cylinder 2. S3, first install the sealing ring 3 and the retaining ring 4 into the annular sealing groove 202, then press the working cylinder 1 into the intermediate cylinder 2 from the upper end of the intermediate cylinder 2 until the set position is reached. When implementing this invention, the pressing depth of the working cylinder 1 is determined according to the stroke requirements of the shock absorber, and there is no need to make special designs for shock absorbers with different strokes.

[0031] In this embodiment, for ease of assembly, the working cylinder 1 has inner and outer chamfers at both ends, and the intermediate cylinder 2 has inner chamfers at both ends.

[0032] In addition to the above-mentioned technical solutions for single-valve electronically controlled vibration dampers, the present invention also proposes corresponding technical solutions for dual-valve electronically controlled vibration dampers.

[0033] The dual-valve electronically controlled vibration damper has two solenoid valves, one for controlling the recovery stroke and the other for controlling the compression stroke. See also Figure 5 In the prior art, in the working cylinder assembly of a dual-valve electrically controlled vibration damper, the working cylinder 1 is fitted with two intermediate cylinders 2 (a recovery intermediate cylinder and a compression intermediate cylinder). Both intermediate cylinders 2 are fixedly connected and sealed to the outer wall of the working cylinder 1 through constricted ends. The working cylinder 1 has a recovery vent hole 102 and a compression vent hole 103. The working cylinder 1 is a straight cylindrical structure with a constant diameter. Similar to the case of a single-valve electrically controlled vibration damper, during assembly, the piston ring on the piston 9 and the sealing ring on the intermediate cylinder 2 are easily scratched by the burrs on the edge of the vent hole 101 when passing through it, causing leakage. To address this problem, the present invention provides a working cylinder assembly for a dual-valve electrically controlled vibration damper with a novel structure, and a dual-valve electrically controlled vibration damper using this assembly, which will be described below with reference to Embodiment 2.

[0034] Embodiment 2 of the present invention (see Figure 6-8 ): This embodiment provides a dual-valve electronically controlled vibration damper, which adopts a novel working cylinder assembly.

[0035] In this embodiment, the working cylinder assembly includes a working cylinder 1 and an intermediate cylinder 2. The upper part of the working cylinder 1 is provided with a recovery vent hole 102, and the lower part of the working cylinder 1 is provided with a compression vent hole 103. The upper part of the working cylinder 1 is machined with a flared structure to form a stepped surface; the recovery vent hole 102 is located on this stepped surface. The upper end of the working cylinder 1 is located inside the intermediate cylinder 2 and is fixedly connected to the inner wall of the intermediate cylinder 2 with an interference fit. The lower end of the intermediate cylinder 2 has a constricted structure, and the lower end of the working cylinder 1 extends relative to the lower end of the intermediate cylinder 2. The lower end of the intermediate cylinder 2 is fixedly connected to and sealed to the outer wall of the working cylinder 1. A venting cavity is formed between the working cylinder 1 and the intermediate cylinder 2. A seal is provided in the venting cavity near the compression vent hole 103. Partition 5 (in this invention, there is only one intermediate cylinder 2; in the prior art, there are two intermediate cylinders 2); the sealing partition 5 divides the venting chamber into a restoration venting chamber and a compression venting chamber; the restoration venting hole 102 connects the upper chamber of the working cylinder 1 to the restoration venting chamber, and the compression venting hole 103 connects the lower chamber of the working cylinder 1 to the compression venting chamber; the intermediate cylinder 2 is provided with a restoration solenoid valve flow hole 203 and a compression solenoid valve flow hole 204; the restoration solenoid valve flow hole 203 allows the oil in the restoration venting chamber to flow into the restoration solenoid valve, and the compression solenoid valve flow hole 204 allows the oil in the compression venting chamber to flow into the compression solenoid valve (the restoration solenoid valve is installed on the restoration solenoid valve seat 10, and the compression solenoid valve is installed on the compression solenoid valve seat 11).

[0036] During assembly, piston 9 passes through the recovery vent 102. Since the recovery vent 102 is located on the stepped surface formed by the flared structure, the piston rings will not come into contact with the burrs on the edge of the recovery vent 102, thus preventing the piston rings from being scratched. Furthermore, due to the new structural design, the sealing rings on the intermediate cylinder 2 will not pass through the recovery vent 102 and the compression vent 103 during assembly, thus eliminating the possibility of them being scratched.

[0037] In this embodiment, due to the special structural design, after the shock absorber is assembled, the upper end of the intermediate cylinder 2 is connected to the guide 6, and the lower end of the working cylinder 1 is connected to the compression bottom valve 7. In the prior art, the guide 6 needs to be connected to the upper end of the working cylinder 1.

[0038] In this embodiment, in order to achieve reliable sealing and facilitate industrial implementation, the lower end of the intermediate cylinder 2 is provided with an annular sealing groove 202, and the sealing groove 202 is provided with a sealing ring 3 and a retaining ring 4, with the retaining ring 4 located below the sealing ring 3; the working cylinder 1 is machined with two grooves, and each groove is provided with a retaining spring 501, and a partition sealing ring 502 (an O-ring in this embodiment) is provided between the two retaining springs 501, thereby forming a sealing partition 5.

[0039] In this embodiment, the manufacturing process of the working cylinder assembly includes the following steps: S1, the restoration vent hole 102 and the compression vent hole 103 are machined on the working cylinder blank (in this embodiment, the vent hole is obtained by punching from the inside to the outside. Since the restoration vent hole 102 is obtained by punching from the inside to the outside, there are no exposed sharp changes and burrs on the inner edge of the restoration vent hole 102, thereby further reducing the possibility of the piston ring being scratched during assembly), and the upper part is flared so that the restoration vent hole 102 is located on the stepped surface formed by the flaring; and two grooves are machined near the compression vent hole 103 to obtain the working cylinder 1; S2, the intermediate cylinder blank is narrowed and grooved at the lower end to obtain the intermediate cylinder 2; S3, install snap rings 501 and partition seal rings 502 sequentially on the working cylinder 1, so that there is one snap ring 501 in each of the two grooves, and the partition seal ring 502 is located between the two snap rings 501; install the seal ring 3 and the retaining ring 4 into the annular sealing groove 202 of the intermediate cylinder 2; then, press the working cylinder 1 into the intermediate cylinder 2 from the upper end until the set position is reached. When implementing this invention, the pressing depth of the working cylinder 1 is determined according to the stroke requirements of the shock absorber, and there is no need to make special designs for shock absorbers with different strokes.

[0040] In this embodiment, for ease of assembly, the working cylinder 1 has inner and outer chamfers at both ends, and the intermediate cylinder 2 has inner chamfers at both ends.

[0041] When implementing this invention, after the working cylinder assembly is manufactured, the subsequent assembly of the shock absorber can be as follows: press the compression valve system assembly into the lower end of the working cylinder 1, and install the guide assembly from the upper end of the working cylinder, and then install them together into the reservoir 8. In the reservoir 8, press the guide assembly into the intermediate cylinder 2 until the guide assembly is stuck on the step of the reservoir 8 (the pressure of pressing the guide assembly and the compression valve system assembly must be less than the pressure when pressing into the working cylinder 1).

[0042] The foregoing general description of the invention and its specific embodiments should not be construed as limiting the technical solution of the invention. 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 embodiments without departing from the constituent elements of the invention, to form other technical solutions within the scope of protection of this application.

Claims

1. The working cylinder assembly of a dual-valve electronically controlled vibration damper, characterized in that: It includes a working cylinder (1) and an intermediate cylinder (2); the upper part of the working cylinder (1) is provided with a recovery vent hole (102), and the lower part of the working cylinder (1) is provided with a compression vent hole (103); the upper part of the working cylinder (1) has a flared structure to form a stepped surface; the recovery vent hole (102) is located on the stepped surface; the upper end of the working cylinder (1) is located inside the intermediate cylinder (2) and is fixedly connected to the inner wall of the intermediate cylinder (2) by interference fit; the lower end of the intermediate cylinder (2) has a constricted structure, the lower end of the working cylinder (1) extends relative to the lower end of the intermediate cylinder (2), and the lower end of the intermediate cylinder (2) is fixedly connected to and sealed to the outer wall of the working cylinder (1); The working cylinder (1) and the intermediate cylinder (2) are connected to a venting chamber. In the venting chamber, a sealing partition (5) is provided near the compression venting hole (103). The sealing partition (5) divides the venting chamber into a restoration venting chamber and a compression venting chamber. The restoration venting hole (102) connects the upper chamber of the working cylinder (1) to the restoration venting chamber, and the compression venting hole (103) connects the lower chamber of the working cylinder (1) to the compression venting chamber. The intermediate cylinder (2) is provided with a recovery solenoid valve flow hole (203) and a compression solenoid valve flow hole (204). The recovery solenoid valve flow hole (203) allows the oil in the recovery drain chamber to flow into the recovery solenoid valve, and the compression solenoid valve flow hole (204) allows the oil in the compression drain chamber to flow into the compression solenoid valve.

2. The working cylinder assembly of the dual-valve electronically controlled vibration damper according to claim 1, characterized in that: The lower end of the intermediate cylinder (2) is provided with an annular sealing groove (202), and a sealing ring (3) and a retaining ring (4) are provided in the annular sealing groove (202). The retaining ring (4) is located on the lower side of the sealing ring (3). The working cylinder (1) has two grooves machined on it, and a retaining ring (501) is provided in each of the two grooves. A partition sealing ring (502) is provided between the two retaining rings (501) to form a sealing partition (5).

3. The working cylinder assembly of the dual-valve electronically controlled vibration damper according to claim 2, characterized in that: The manufacturing process of the working cylinder assembly includes the following steps: S1, a restoration vent hole (102) and a compression vent hole (103) are machined on the working cylinder blank, and the upper part is flared so that the restoration vent hole (102) is located on the stepped surface formed by the flaring; and two grooves are machined near the compression vent hole (103) to obtain the working cylinder (1). S2, the intermediate cylinder blank is swollen and grooved at the lower end to obtain the intermediate cylinder (2). S3, install snap rings (501) and partition seal rings (502) in sequence on the working cylinder (1), so that there is a snap ring (501) in each of the two grooves and the partition seal ring (502) is located between the two snap rings (501); install the seal ring (3) and the retaining ring (4) in the annular sealing groove (202) of the intermediate cylinder (2); then, press the working cylinder (1) into the intermediate cylinder (2) from the upper end of the intermediate cylinder (2) until the set position is reached.

4. The working cylinder assembly of the dual-valve electronically controlled vibration damper according to claim 3, characterized in that: In step S1, a restored drain hole (102) is obtained by punching holes from the inside out.

5. A dual-valve electrically controlled vibration damper, characterized in that: The working cylinder assembly as described in claim 1 is adopted; the upper end of the intermediate cylinder (2) is connected to the guide (6), and the lower end of the working cylinder (1) is connected to the compression bottom valve (7).

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