A shock absorber damping valve

Abstract

The utility model discloses a shock absorber damping valve, aims at providing a kind of shell manufacturing difficulty of shock absorber damping valve can be effectively reduced, to facilitate actual processing, improve the yield of finished product a kind of shock absorber damping valve. It includes: electromagnetic assembly, including coil and moving iron;Valve body assembly, including main valve body;Shell, including split production's outer shell, inner shell and end shell, inner shell is located in outer shell, inner shell and outer shell are located at end shell same side, inner shell and outer shell are all connected on end shell, coil is set between inner shell and outer shell, inner shell is equipped with guide inner chamber, and moving iron is slidably arranged in guide inner chamber.

Description

Technical Field

[0001] This utility model relates to the field of shock absorber technology, specifically to a shock absorber damping valve. Background Technology

[0002] Shock absorbers are a crucial component of a car's suspension system, key to absorbing vibrations and suppressing impacts when the springs rebound after road shocks. While traditional passive suspension systems offer some damping, their performance and comfort are limited, as they cannot adjust in real-time according to road conditions and driving situations. To address these issues, shock absorbers need to be adjustable, i.e., adjustable shock absorbers. The core component of an adjustable shock absorber is the damping valve. The main purpose of the damping valve is to improve vehicle stability and comfort by dynamically adjusting the damping force of the shock absorber. For example, the Continuous Damping Control (CDC) system is a typical active suspension technology. The CDC system automatically identifies road conditions and makes continuous adjustments, independently controlling the suspension damping of each wheel.

[0003] Current shock absorber damping valves generally include a housing, an electromagnetic assembly, and a valve body assembly. The housing comprises an integrally formed outer housing, an inner housing, and an end housing. The coil of the electromagnetic assembly is located between the inner housing and the outer housing, and the moving iron of the electromagnetic assembly is slidably disposed within the inner housing. For example, Chinese Patent Publication No. CN 119122983 A, entitled "A Novel External Electromagnetic Valve Assembly for Shock Absorbers," includes an integral yoke sleeve (equivalent to a housing, comprising an integrally formed outer housing, inner housing, and end housing), with the coil fixed within the integral yoke sleeve. Currently, the outer housing, inner housing, and end housing of shock absorber damping valves are integrally formed. While this reduces the number of housing components, the inner housing and end housing each have corresponding structures, resulting in a complex structure. Furthermore, the small gap between the inner housing and the outer housing necessitates grooves on the outer surface of the inner housing to form an insulating section. This makes the integrally formed housing difficult to manufacture, resulting in a low yield rate. Utility Model Content

[0004] The purpose of this invention is to provide a shock absorber damping valve that can effectively reduce the manufacturing difficulty of the housing of the shock absorber damping valve, so as to facilitate actual processing and manufacturing and improve the yield of finished products.

[0005] The technical solution of this utility model is:

[0006] A shock absorber damping valve, comprising:

[0007] Electromagnetic components, including coils and moving iron;

[0008] Valve body assembly, including the main valve body;

[0009] The housing comprises a separately manufactured outer shell, an inner shell, and an end shell. The inner shell is located inside the outer shell, and both the inner and outer shells are situated on the same side of the end shells. Both the inner and outer shells are connected to the end shells. A coil is positioned between the inner and outer shells. A guide cavity is provided within the inner shell, and a moving iron is slidably disposed within this guide cavity. In this design, the shock absorber damping valve's housing is divided into three independent parts: the outer shell, the inner shell, and the end shell. These parts are manufactured separately and then assembled as a single unit. This simplifies the structure of each component, facilitating their manufacturing and reducing the overall manufacturing difficulty of the shock absorber damping valve housing, thus improving the yield rate.

[0010] Preferably, the end housing includes an end cap and a mounting hole located in the middle of the end cap. One end of the inner housing is inserted into the mounting hole, and the inner housing is interference-fitted with the mounting hole. This facilitates the assembly and connection of the inner housing and the end housing.

[0011] Preferably, the mounting hole is a stepped hole, consisting of a limiting hole, a sealing hole, and a connecting hole connected in sequence. The inner diameters of the limiting hole, sealing hole, and connecting hole decrease sequentially. One end of the inner housing has an outwardly extending flange, which is located inside the limiting hole and abuts against the end face of the limiting hole. The inner housing passes through the sealing hole and the connecting hole in sequence. An inner sealing ring is provided in the sealing hole between the flange and the end face of the sealing hole. The flange and the limiting hole and / or the inner housing and the connecting hole are interference-fitted. This not only facilitates the assembly and connection of the inner housing and the end housing, ensuring the stability of the connection between the inner housing and the end housing, but also ensures the sealing between the connection structure of the inner housing and the end housing, preventing oil from seeping into the space between the inner housing and the outer housing through the connection structure between the inner housing and the end housing.

[0012] Preferably, one end of the end housing extends into the outer housing, and the end housing and the outer housing are interference-fitted. This facilitates the assembly and connection of the outer housing and the end housing, and ensures the stability of the connection between the outer housing and the end housing.

[0013] Preferably, the inner wall of one end of the outer casing has a stepped surface, one end of the end housing abuts against the stepped surface, and the other end of the end housing has an outwardly extending annular protrusion. An outer sealing ring is provided between the annular protrusion and the end face of the outer casing. This facilitates the assembly and connection of the outer casing and the end housing, and forms a sealing ring groove between the annular protrusion and the end face of the outer casing for installing the outer sealing ring.

[0014] Preferably, the inner shell is cylindrical and is a one-piece molded structure. The inner shell includes a conductive section and an insulating section, with the insulating section formed by an annular groove on the outer surface of the inner shell. This facilitates the actual processing and manufacturing of the inner shell.

[0015] Preferably, both sides of the annular groove are inclined surfaces, with the inclination angle of the inclined surface closer to the end housing being greater than that of the other inclined surface. Currently, the opposite sides of the annular groove (both sides of the annular groove are inclined surfaces) on the inner housing of existing shock absorber damping valves, used to form the insulating section, are generally symmetrically distributed for ease of manufacturing. The inventors of this application have discovered that by using an asymmetrical arrangement of the two inclined surfaces of the annular groove, and with the inclination angle of the inclined surface closer to the end housing being greater than that of the other inclined surface, the internal force horizontal characteristics within the operating range are better under rated current, thus improving the control accuracy of the shock absorber damping valve.

[0016] Preferably, the end of the end housing facing the valve body assembly has a mounting groove, and one end of the main valve body extends into the mounting groove and abuts against the bottom surface of the mounting groove, with the main valve body and the mounting groove having an interference fit. This facilitates the assembly and connection of the main valve body and the end housing, and ensures the stability of the connection between the main valve body and the end housing.

[0017] Preferably, the valve body assembly also includes a main valve core and an oil outlet channel. The main valve core divides the inner cavity of the main valve body into two valve chambers, and the oil outlet channel includes:

[0018] The oil outlet groove is located in the middle of the end face of the main valve body facing the bottom of the mounting groove. The main valve core is provided with a pilot valve hole that connects one of the valve chambers to the oil outlet groove.

[0019] The external oil passage is located between the inner wall of the mounting groove and the outer surface of the main valve body;

[0020] The connecting oil groove is located on the end face of the main valve body facing the bottom of the mounting groove and connects the oil outlet groove with the external oil passage. This facilitates the actual machining and fabrication of the oil outlet passage in the main valve body.

[0021] Preferably, the outer surface of the main valve body is cylindrical, and two symmetrically distributed axial cross-sections are provided on the outer surface of the main valve body. The outer oil passage corresponds to the axial cross-section one by one. The axial cross-section and the inner wall of the mounting groove form the outer oil passage. The connecting oil groove corresponds to the outer oil passage one by one. The connecting oil groove connects the oil outlet groove and the corresponding outer oil passage.

[0022] The electromagnetic assembly also includes a push rod, which is fixedly connected to a moving iron. One end of the push rod has a tapered head that mates with the pilot valve bore. This facilitates the actual machining and fabrication of the oil outlet channel in the main valve body.

[0023] The beneficial effects of this utility model are: by dividing the shell into three independent parts—the outer shell, the inner shell, and the end shell—the shell is processed and manufactured separately, and then assembled into one unit; in this way, the structure of each of the three components—the outer shell, the inner shell, and the end shell—is simplified, thereby facilitating the actual processing and manufacturing of the outer shell, the inner shell, and the end shell, effectively reducing the difficulty of manufacturing the shell of the shock absorber damping valve, and improving the yield of finished products. Attached Figure Description

[0024] Figure 1 This is a cross-sectional structural diagram of a shock absorber damping valve according to this utility model.

[0025] In the picture:

[0026] 1. Housing, 1.1 outer shell, 1.2 inner shell, 1.20 guide cavity, 1.21 annular groove, 1.22 inclined surface, 1.23 flange, 1.3 end shell, 1.31 end cap, 1.32 mounting hole, 1.33 mounting groove, 1.34 annular protrusion;

[0027] Electromagnetic component 2, coil 2.1, moving iron 2.2, push rod 2.3, cone 2.4;

[0028] Valve body assembly 3, main valve body 3.1, main valve core 3.2, outer valve cavity 3.3, inner valve cavity 3.4, pilot valve hole 3.5, oil outlet hole 3.6, oil outlet channel 3.7, oil outlet groove 3.71, outer oil passage 3.72, connecting oil groove 3.73;

[0029] Positioning sleeve 4;

[0030] Guide sleeve 5;

[0031] Inner sealing ring 6. Detailed Implementation

[0032] Specific Implementation Example 1, such as Figure 1 As shown, a shock absorber damping valve includes a housing 1, an electromagnetic assembly 2, and a valve body assembly 3. The electromagnetic assembly 2 includes a coil 2.1 and a moving iron 2.2. The valve body assembly 3 includes a main valve body 3.1.

[0033] The housing 1 comprises a separate outer shell 1.1, an inner shell 1.2, and an end shell 1.3. The inner shell 1.2 is located inside the outer shell 1.1. The inner shell 1.2 and the outer shell 1.1 are located on the same side of the end shell 1.3. Both the inner shell 1.2 and the outer shell 1.1 are connected to the end shell 1.3. A coil 2.1 is disposed between the inner shell 1.2 and the outer shell 1.1. In this embodiment, a coil receiving cavity is formed between the inner shell 1.2 and the outer shell 1.1, and the coil 2.1 is disposed within the coil receiving cavity. A guide cavity 1.20 is provided inside the inner shell 1.2. The moving iron 2.2 is slidably disposed within the guide cavity 1.20.

[0034] In this embodiment, the shock absorber damping valve divides the housing 1 into three independent parts: the outer shell 1.1, the inner shell 1.2, and the end shell 1.3. These parts are then manufactured separately and assembled into a single unit. This simplifies the structure of each component, making it easier to manufacture and reduce the manufacturing difficulty of the housing 1, thereby improving the yield rate of the finished product.

[0035] Specific embodiment two, such as Figure 1 As shown, a shock absorber damping valve includes a housing 1, an electromagnetic assembly 2, and a valve body assembly 3. The electromagnetic assembly 2 includes a coil 2.1 and a moving iron 2.2. The valve body assembly 3 includes a main valve body 3.1.

[0036] The housing 1 comprises a separate outer shell 1.1, an inner shell 1.2, and an end shell 1.3. The inner shell 1.2 is located inside the outer shell 1.1. The inner shell 1.2 and the outer shell 1.1 are located on the same side of the end shell 1.3. Both the inner shell 1.2 and the outer shell 1.1 are connected to the end shell 1.3. A coil 2.1 is disposed between the inner shell 1.2 and the outer shell 1.1. In this embodiment, a coil receiving cavity is formed between the inner shell 1.2 and the outer shell 1.1, and the coil 2.1 is disposed within the coil receiving cavity. A guide cavity 1.20 is provided inside the inner shell 1.2. The moving iron 2.2 is slidably disposed within the guide cavity 1.20.

[0037] In this embodiment, both the inner shell 1.2 and the outer shell 1.1 are connected to the end shell 1.3. Specifically,

[0038] In one implementation, such as Figure 1 As shown, the end housing 1.3 includes an end cap 1.31 and a mounting hole 1.32 located in the middle of the end cap 1.31. One end of the inner housing 1.2 is inserted into the mounting hole 1.32, and the inner housing 1.2 and the mounting hole 1.32 are interference-fitted. This facilitates the assembly and connection of the inner housing 1.2 and the end housing 1.3.

[0039] like Figure 1 As shown, one end of the end housing 1.3 extends into the outer housing 1.1, and the end housing 1.3 and the outer housing 1.1 are interference-fitted. This facilitates the assembly and connection of the outer housing 1.1 and the end housing 1.3, and ensures the stability of the connection between them. In this embodiment, the outer housing 1.1 is cylindrical.

[0040] In another embodiment, the end housing 1.3 includes an end cap 1.31 and a mounting hole 1.32 located in the middle of the end cap 1.31. One end of the inner housing 1.2 is inserted into the mounting hole 1.32, and the inner housing 1.2 is welded to the end cap 1.31. This facilitates the assembly and connection of the inner housing 1.2 and the end housing 1.3, ensuring the stability of the connection between the inner housing 1.2 and the end housing 1.3.

[0041] One end of the end housing 1.3 extends into the outer housing 1.1, and the end housing 1.3 is welded to the outer housing 1.1. This facilitates the assembly and connection of the outer housing 1.1 and the end housing 1.3, and ensures the stability of the connection between the outer housing 1.1 and the end housing 1.3. In this embodiment, the outer housing 1.1 is cylindrical.

[0042] In this embodiment, the shock absorber damping valve divides the housing 1 into three independent parts: the outer shell 1.1, the inner shell 1.2, and the end shell 1.3. These parts are then manufactured separately and assembled into a single unit. This simplifies the structure of each component, making it easier to manufacture and reduce the manufacturing difficulty of the housing 1, thereby improving the yield rate of the finished product.

[0043] Specifically, such as Figure 1 As shown, the valve body assembly 3 also includes a main valve core 3.2 and an oil outlet channel 3.7. The main valve core 3.2 divides the inner cavity of the main valve body 3.1 into two valve chambers, one of which is the inner valve chamber 3.4, and the other is the outer valve chamber 3.3. The main valve core 3.2 is provided with a damping through hole connecting the inner valve chamber 3.4 and the outer valve chamber 3.3. The main valve body 3.1 corresponding to the outer valve chamber 3.3 is provided with several circumferentially distributed oil outlet holes 3.6, which connect the outer valve chamber 3.3 and the outer surface of the main valve body 3.1.

[0044] The end housing 1.3 has a mounting groove 1.33 at one end facing the valve body assembly 3. One end of the main valve body 3.1 extends into the mounting groove 1.33 and abuts against the bottom surface of the mounting groove 1.33, with an interference fit between the main valve body 3.1 and the mounting groove 1.33. This facilitates the assembly and connection of the main valve body 3.1 and the end housing 1.3, and ensures the stability of the connection between the main valve body 3.1 and the end housing 1.3.

[0045] The oil outlet channel 3.7 includes an oil outlet groove 3.71, an outer oil passage 3.72, and a connecting oil groove 3.73. The oil outlet groove 3.71 is located in the middle of the end face of the main valve body 3.1 facing the bottom of the mounting groove 1.33. The outer oil passage 3.72 is located between the inner wall of the mounting groove 1.33 and the outer side of the main valve body 3.1. The connecting oil groove 3.73 is located on the end face of the main valve body 3.1 facing the bottom of the mounting groove 1.33, and connects the oil outlet groove 3.71 and the outer oil passage 3.72. This facilitates the actual machining and fabrication of the oil outlet channel 3.7 in the main valve body 3.1.

[0046] The inner valve chamber 3.4 is located between the oil outlet groove 3.71 and the outer valve chamber 3.3. The main valve core 3.2 is provided with a pilot valve hole 3.5 connecting one of the valve chambers and the oil outlet groove 3.71. In this embodiment, the main valve core 3.2 is provided with a pilot valve hole 3.5 connecting the inner valve chamber 3.4 and the oil outlet groove 3.71.

[0047] The electromagnetic assembly 2 also includes a push rod 2.3. The guide cavity 1.20 is open at one end facing the main valve body, and closed at the other end. A positioning sleeve 4 and a guide sleeve 5 are provided inside the guide cavity 1.20, with the positioning sleeve 4 near the closed end of the guide cavity 1.20 and the guide sleeve 5 near the open end. The push rod 2.3 is fixedly connected to the moving iron 2.2. One end of the push rod 2.3 extends into the positioning sleeve 4 and can slide along it. The push rod 2.3 passes through the guide sleeve. One end of the push rod 2.3 is provided with a cone 2.4 that mates with the pilot valve hole 3.5. This facilitates the actual machining and fabrication of the oil outlet channel 3.7 in the main valve body 3.1.

[0048] When the damper damping valve is in operation, the electromagnetic component 2 pushes the push rod 2.3, causing the cone head 2.4 of the cone rod to close the pilot valve orifice 3.5. At this time, the hydraulic oil in the main valve body 3.1 flows out of the main valve body 3.1 through the outer valve chamber 3.3 and the oil outlet 3.6. When damping needs to be adjusted, the electromagnetic component 2 controls the push rod 2.3 and the cone head 2.4 to move, thereby opening the pilot valve orifice 3.5. At this time, the hydraulic oil in the main valve body 3.1 will also pass through the damping orifice into the internal volume chamber, and then flow out of the main valve body 3.1 through the pilot orifice and the oil outlet channel 3.7. Simultaneously, the electromagnetic component 2 controls the movement of the control push rod 2.3 and the cone head 2.4 by giving a given current, thereby controlling the opening degree of the pilot valve orifice 3.5 to achieve different damping adjustments.

[0049] Furthermore, such as Figure 1As shown, the outer surface of the main valve body 3.1 is cylindrical. Two symmetrically distributed axial cross-sections are provided on the outer surface of the main valve body 3.1. There are two external oil passages 3.72, and each external oil passage 3.72 corresponds to one of the axial cross-sections. The axial cross-sections and the inner wall of the mounting groove 1.33 form the external oil passages 3.72. There are two connecting oil grooves 3.73, and each connecting oil groove 3.73 corresponds to one of the external oil passages 3.72. The two connecting oil grooves 3.73 are symmetrically distributed. The connecting oil grooves 3.73 connect the outlet oil groove 3.71 to the corresponding external oil passage 3.72. This facilitates the actual machining and manufacturing of the external oil passages 3.72 and the connecting oil grooves 3.73.

[0050] It should be noted that the external oil passage 3.72 can also be formed by a groove structure set on the outer side of the main valve body 3.1.

[0051] Furthermore, such as Figure 1 As shown, mounting hole 1.32 is a stepped hole. Mounting hole 1.32 consists of a limiting hole, a sealing hole, and a connecting hole connected in sequence. The inner diameters of the limiting hole, sealing hole, and connecting hole decrease sequentially. One end of the inner housing 1.2 is provided with an outwardly extending flange 1.23. The flange 1.23 is located inside the limiting hole and abuts against the end face of the limiting hole. The inner housing 1.2 passes through the sealing hole and the connecting hole in sequence. An inner sealing ring 6 is provided in the sealing hole between the flange 1.23 and the end face of the sealing hole. The flange 1.23 and the limiting hole and / or the inner housing 1.2 and the connecting hole are interference-fitted. In this way, not only can the assembly and connection of the inner housing 1.2 and the end housing 1.3 be facilitated, ensuring the connection stability of the inner housing 1.2 and the end housing 1.3; but it can also ensure the sealing between the connection structure of the inner housing 1.2 and the end housing 1.3, preventing oil from seeping into the space between the inner housing 1.2 and the outer housing 1.1 through the connection structure between the inner housing 1.2 and the end housing 1.3.

[0052] In one example, flange 1.23 is interference-fitted with the limiting hole. Inner housing 1.2 is interference-fitted with the connecting hole. This ensures the connection stability between inner housing 1.2 and end housing 1.3.

[0053] In another example, flange 1.23 is interference-fitted with the limiting hole. Inner housing 1.2 is clearance-fitted with the connecting hole. In this way, on the one hand, the connection stability between inner housing 1.2 and end housing 1.3 is ensured, and on the other hand, it facilitates the assembly and connection of inner housing 1.2 and end housing 1.3.

[0054] In the third example, the inner housing 1.2 is interference-fitted with the connecting hole, and the flange 1.23 is clearance-fitted with the limiting hole. This ensures the stability of the connection between the inner housing 1.2 and the end housing 1.3, and also facilitates the assembly and connection of the inner housing 1.2 and the end housing 1.3.

[0055] Furthermore, such as Figure 1 As shown, a stepped surface is provided on the inner wall of one end of the outer casing 1.1. One end of the end casing 1.3 abuts against the stepped surface. The other end of the end casing 1.3 is provided with an outwardly extending annular protrusion 1.34, and an outer sealing ring is provided between the annular protrusion 1.34 and the end face of the outer casing 1.1. This facilitates the assembly and connection of the outer casing 1.1 and the end casing 1.3, and forms a sealing ring groove for installing the outer sealing ring between the annular protrusion 1.34 and the end face of the outer casing 1.1. Specifically, the end cap 1.31 of the end casing 1.3 is located inside the outer casing 1.1, and one end face of the end cap 1.31 abuts against the stepped surface. The edge of the end cap 1.31 is provided with an annular casing 1 extending outward from the outer casing 1.1. The annular protrusion 1.34 is provided at the end of the annular casing 1. The inner cavity of the annular casing 1 forms a mounting groove 1.33.

[0056] Furthermore, such as Figure 1 As shown, the inner shell 1.2 is cylindrical and is a one-piece molded structure. The inner shell 1.2 includes a conductive section and an insulating section. The insulating section is formed by an annular groove 1.21 on the outer surface of the inner shell 1.2. The inner shell 1.2 on both sides of the insulating section constitutes the conductive section. This facilitates the actual processing and manufacturing of the inner shell 1.2.

[0057] Furthermore, both sides of the annular groove 1.21 are inclined surfaces 1.22.

[0058] In one implementation, such as Figure 1 As shown, the opposite sides of the annular groove 1.21 are both inclined surfaces 1.22, and the inclination angle of the inclined surface 1.22 near the end housing 1.3 is greater than that of the other inclined surface 1.22. In this embodiment, the inclination angle of the inclined surface 1.22 near the end housing 1.3 is greater than 30 degrees, and the inclination angle of the other inclined surface 1.22 is less than 30 degrees. For example, the inclination angle of the inclined surface 1.22 near the end housing 1.3 is 40-60 degrees, and the inclination angle of the other inclined surface 1.22 is 20-30 degrees (in this text, the inclination angle of the inclined surface 1.22 of the annular groove 1.21 refers to the angle between the inclined surface 1.22 and the cross-section of the inner housing 1.2). Currently, the opposite sides of the annular groove 1.21 (both sides of the annular groove 1.21 are inclined surfaces 1.22) on the inner housing 1.2 of existing shock absorber damping valves used to form the insulating section are generally symmetrically distributed to facilitate actual production. The inventors of this application discovered that by asymmetrically arranging the two inclined surfaces 1.22 of the annular groove 1.21, and with the inclination angle of the inclined surface 1.22 closer to the end housing 1.3 being greater than that of the other inclined surface 1.22, the internal force horizontal characteristics within the working range are better under rated current, which is beneficial to improving the control accuracy of the damper damping valve.

[0059] In another embodiment, the two opposite sides of the annular groove 1.21 are both inclined surfaces 1.22, and these two inclined surfaces 1.22 are symmetrically distributed. This facilitates actual production.

[0060] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the present utility model. Any simple modifications, alterations, or equivalent transformations made to the above embodiments based on the technical essence of the present utility model shall still fall within the protection scope of the present utility model.

Claims

1. A shock absorber damping valve, comprising: Electromagnetic components, including coils and moving iron; The valve body assembly includes a main valve body; characterized in that it further includes: The housing includes a separate outer shell, an inner shell, and an end shell. The inner shell is located inside the outer shell and the inner shell is located on the same side of the end shell. Both the inner shell and the outer shell are connected to the end shell. The coil is located between the inner shell and the outer shell. The inner shell has a guide cavity, and the moving iron is slidably located in the guide cavity.

2. The damping valve for a shock absorber according to claim 1, characterized in that, The end housing includes an end cap and a mounting hole located in the middle of the end cap. One end of the inner housing is inserted into the mounting hole, and the inner housing is interference-fitted with the mounting hole.

3. A damping valve for a shock absorber according to claim 2, characterized in that, The mounting hole is a stepped hole, which consists of a limiting hole, a sealing hole and a connecting hole connected in sequence. The inner diameters of the limiting hole, the sealing hole and the connecting hole decrease in sequence. One end of the inner shell is provided with an outwardly extending flange. The flange is located in the limiting hole and abuts against the end face of the limiting hole. The inner shell passes through the sealing hole and the connecting hole in sequence. An inner sealing ring is provided in the sealing hole between the flange and the end face of the sealing hole. The flange and the limiting hole and / or the inner shell and the connecting hole are interference fit.

4. A shock absorber damping valve according to claim 1, 2, or 3, characterized in that, One end of the end housing extends into the outer shell, and the end housing and the outer shell are interference-fitted.

5. A shock absorber damping valve according to claim 4, characterized in that, The inner wall of one end of the outer shell is provided with a stepped surface, one end of the end shell abuts against the stepped surface, and the other end of the end shell is provided with an outwardly extending annular protrusion, and an outer sealing ring is provided between the annular protrusion and the end face of the outer shell.

6. A shock absorber damping valve according to claim 1, 2, or 3, characterized in that, The inner shell is cylindrical and is an integrally formed structure. The inner shell includes a conductive section and an insulating section. The insulating section is formed by an annular groove provided on the outer surface of the inner shell.

7. A shock absorber damping valve according to claim 6, characterized in that, The annular groove has two inclined surfaces on opposite sides, with the inclination angle of the inclined surface closer to the end housing being greater than that of the other inclined surface.

8. A shock absorber damping valve according to claim 1, 2, or 3, characterized in that, The end housing has a mounting groove at one end facing the valve body assembly. One end of the main valve body extends into the mounting groove and abuts against the bottom surface of the mounting groove. The main valve body and the mounting groove are interference-fitted.

9. A shock absorber damping valve according to claim 8, characterized in that, The valve body assembly further includes a main valve core and an oil outlet channel. The main valve core divides the inner cavity of the main valve body into two valve chambers. The oil outlet channel includes: The oil outlet groove is located in the middle of the end face of the main valve body facing the bottom of the mounting groove. The main valve core is provided with a pilot valve hole that connects one of the valve chambers to the oil outlet groove. External oil passage, located between the inner wall of the mounting groove and the outer side of the main valve body; The connecting oil tank is located on the end face of the main valve body facing the bottom of the mounting groove and connects the oil tank to the external oil passage.

10. A shock absorber damping valve according to claim 9, characterized in that, The outer surface of the main valve body is cylindrical, and two symmetrically distributed axial cross-sections are provided on the outer surface of the main valve body. The outer oil passage corresponds to the axial cross-section one by one. The axial cross-section and the inner wall of the mounting groove form the outer oil passage. The connecting oil groove corresponds to the outer oil passage one by one. The connecting oil groove connects the oil outlet groove and the corresponding outer oil passage. The electromagnetic component also includes a push rod, which is fixedly connected to the moving iron. One end of the push rod is provided with a cone that mates with the pilot valve hole.

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