Solenoid valve and shock absorber comprising same

Abstract

The utility model relates to an electromagnetic valve and a shock absorber comprising the electromagnetic valve. The structure of the electromagnetic valve can be simplified. The electromagnetic valve comprises a movable valve element capable of conducting axial reciprocating motion. The pin shaft can move along with the movable valve element and has the function of the valve element, the pin shaft comprises a rod body arranged in the axial direction and a pin shaft head portion extending from the rod body, the rod body comprises a tail portion connected to the movable valve element and a head portion connected to the pin shaft head portion, and the pin shaft head portion comprises a pressurizing portion with the outer diameter gradually increased in the axial direction from the position extending from the head portion of the rod body; the valve shell is used for accommodating the head part of the pin shaft and comprises a shaft end plate; the shaft end plate comprises a through hole which extends in the axial direction, penetrates through the shaft end plate and is used for allowing the rod body to penetrate through, and an inner wall which limits the through hole and has the diameter smaller than or equal to the maximum outer diameter of the pressurizing part. The auxiliary groove is formed in the inner wall, extends in the axial direction, penetrates through the shaft end plate and is communicated with the through hole so that working fluid can flow between the pressurizing part and the shaft end plate in the state that the pressurizing part makes contact with the shaft end plate.

Description

Technical Field

[0001] This utility model relates to a solenoid valve and a shock absorber including the solenoid valve, and more particularly to a CDC (Continuous Damping Control) solenoid valve and a CDC shock absorber including the CDC solenoid valve. Background Technology

[0002] The CDC solenoid valve in an automobile achieves continuous damping control by frequently adjusting the pressure of the working fluid within the CDC shock absorber. This allows the valve to continuously adjust damping based on vehicle speed and road conditions, improving ride stability, comfort, and safety. Currently, a solenoid valve typically includes a valve body with grooves on its end face, a pilot valve seat fixed within the valve body, a pilot valve core slidably housed at one end of the valve body, a moving valve core reciprocating axially outside the valve body, and a plunger connected to the moving valve core and moving with it to drive the pilot valve core against the pilot valve seat. The pilot valve core has a porous structure. Specifically, it has several axially penetrating holes that allow the working fluid to flow through to the grooves, thus creating a damping effect. However, the large number of components in a solenoid valve makes its structure complex. Utility Model Content

[0003] One object of this application is to provide a solenoid valve and a shock absorber including the solenoid valve, which can simplify the structure of the solenoid valve.

[0004] Therefore, in a first aspect, the present invention provides a solenoid valve, comprising a movable valve core capable of axial reciprocating motion and a first elastic member for resetting the movable valve core when the solenoid valve is not energized. The solenoid valve further comprises: a pin connected to the movable valve core and capable of axial reciprocating motion with the movable valve core and having the function of a valve core; the pin comprising a rod body arranged axially and a pin head portion extending from the rod body; the rod body comprising a tail portion connected to the movable valve core and a head portion connected to the pin head portion; the pin head portion comprising a pressure portion whose outer diameter gradually increases from the end portion extending from the head portion of the rod body along the axial direction; a valve housing with one shaft end open and the other shaft end closed and housing the pin head portion; the valve housing comprising a shaft end plate; the shaft end plate comprising a through hole extending axially and penetrating the shaft end plate for the rod body to pass through; an inner wall defining the through hole and having a diameter less than or equal to the maximum outer diameter of the pressure portion; and an auxiliary groove formed on the inner wall extending axially through the shaft end plate and communicating with the through hole to allow working fluid to flow between the pressure portion and the shaft end plate when the pressure portion is in contact with the shaft end plate.

[0005] The solenoid valve may exhibit one or more of the following features, either individually or in combination.

[0006] In some embodiments, the cross-section of the auxiliary groove is arc-shaped, rectangular, or polygonal.

[0007] In some embodiments, the shaft end plate further includes a first end face and a second end face opposite to the first end face, the first end face being closer to the moving valve core relative to the second end face, and the shaft end plate further includes a first cavity formed axially recessed from the first end face surrounding the through hole and the auxiliary groove, the first cavity being connected to the through hole and the auxiliary groove.

[0008] In some embodiments, the valve housing further includes an annular wall extending axially from the edge of the shaft end plate, and the shaft end plate further includes a second cavity extending outwardly along the first end face and a third cavity extending axially along the outer peripheral surface of the annular wall, the second cavity communicating with the first cavity and the third cavity communicating with the second cavity.

[0009] In some embodiments, the diameter of the head of the rod is smaller than the diameter of the tail of the rod, and the axial length of the head of the rod is greater than the axial length of the inner wall.

[0010] In some embodiments, the solenoid valve further includes a valve member having the function of a valve housing housed within a valve body. The valve member includes a cap body that houses a pin head and has an open end, and a brim that surrounds and extends radially outward from the opening of the cap body. The opening of the cap body faces a through hole. The solenoid valve further includes a second elastic member that abuts against the brim in a compressed state, such that the brim abuts against the shaft end plate.

[0011] In some embodiments, the force exerted by the second elastic element on the cap brim is greater than the force exerted by the pin on the valve when the solenoid valve is energized.

[0012] In some embodiments, the solenoid valve further includes a connecting portion that extends from the pressurizing portion and has a smaller outer diameter from the point of extension to the pressurizing portion. The pressurizing portion forms a shoulder at the connection between the pressurizing portion and the connecting portion. The two ends of the first elastic member abut against the shoulder and the valve member, respectively. The force exerted by the first elastic member on the valve member is less than the force exerted by the second elastic member on the brim.

[0013] In some embodiments, the solenoid valve further includes a sealing gasket, and the valve housing further includes an annular limiting portion extending axially from the shaft end plate to the cap body and being received in a sealed state via the sealing gasket. The limiting portion and the cap body together form a receiving space for receiving the head of the pin.

[0014] In a second aspect, this application provides a shock absorber that includes the solenoid valve provided in the first aspect of this application.

[0015] In the solenoid valve of this application, the pin connected to the moving valve core has the function of a valve core. Through the through hole and auxiliary groove of the rod body of the pin housed on the shaft end plate of the valve housing, and the pressurizing part housed in the valve housing and gradually increasing in axial outer diameter from the end of the rod body, the working fluid can still flow between the pressurizing part and the shaft end plate while the pressurizing part is in contact with the shaft end plate. This makes it possible to form a smaller through hole on the valve housing and to control the flow rate and speed of the working fluid with fewer components, thereby simplifying the structure of the solenoid valve. Attached Figure Description

[0016] To further reveal the specific technical content of this case, please first refer to the accompanying drawings, in which:

[0017] Figure 1 This is a three-dimensional schematic diagram of a solenoid valve provided in an embodiment of the present invention;

[0018] Figure 2 yes Figure 1 A plan view of the solenoid valve shown.

[0019] Figure 3 yes Figure 2 A schematic diagram of the AA cross-section of the solenoid valve shown.

[0020] Figure 4 yes Figure 1 The schematic diagram of some components of the solenoid valve shown mainly illustrates the valve sleeve, pin, seal, and valve parts.

[0021] Figure 5 yes Figure 4 An exploded view of the components shown;

[0022] Figure 6 yes Figure 4 A schematic diagram showing the components assembled into the valve housing;

[0023] Figure 7 yes Figure 6 A schematic diagram of one angle of the valve body shown;

[0024] Figure 8 yes Figure 6 A schematic diagram of the valve housing from another angle. Detailed Implementation

[0025] The technical solutions in the embodiments of this utility model will now be described with reference to the accompanying drawings.

[0026] refer to Figure 1 and Figure 2An embodiment of the present invention provides a solenoid valve 100 including a housing 11, a connector 13 fixed to one end of the housing 11, and a cover 15 fixed to the other end of the housing 11. A movable valve core is disposed inside the housing 11. Figure 1 (Not shown). Connector 13 is used for connection to an external power source. In this embodiment, one end of the cover 15 is fixed to the other end of the housing 11.

[0027] refer to Figure 3 The solenoid valve 100 includes a coil 17 fixed inside a housing 11 and a valve sleeve 21 fixed inside the housing 11. The coil 17 is electrically connected to a terminal installed in a connector 13. When the solenoid valve 100 is energized, the coil 17 is connected to an external power source through the connector 13 and generates a magnetic field.

[0028] Reference Figure 3 , Figure 4 and Figure 5 The solenoid valve 100 further includes a movable valve core 31 capable of axial reciprocating motion, a first elastic element 32 for resetting the movable valve core 31 when the solenoid valve 100 is not energized, and a pin 33 connected to the movable valve core 31 and capable of axial reciprocating motion with the movable valve core 31, and having the function of a valve core. The movable valve core 31 is housed within the valve sleeve 21 and can be driven by the magnetic field generated by the coil 17 to move axially within the valve sleeve 21. One end of the first elastic element 32 abuts against the pin 33. In this embodiment, the first elastic element 32 is a conical helical spring or a cylindrical helical spring.

[0029] The pin 33 includes an axially oriented rod 35 and a pin head 34 extending from the rod 35. The rod 35 of the pin 33 passes through the cover 15 and is supported by a bushing 23 installed within the cover 15 to facilitate axial movement. The rod 35 includes a tail portion 35b connected to the moving valve core 31 and a head portion 35a connected to the pin head 34. In this embodiment, the diameter of the head portion 35a of the rod 35 is smaller than the diameter of the tail portion 35b of the rod 35.

[0030] The pin head 34 includes a pressure portion 39a that gradually increases in outer diameter along the axial direction from the head 35a of the rod body 35. The pin head 34 also includes a shoulder 39 that continues from the pressure portion 39a and has a reduced outer diameter. In this embodiment, the pin head 34 further includes a connecting portion 36 that continues from the pressure portion 39a, has a reduced outer diameter, and forms the shoulder 39 at the connection point with the pressure portion 39a. In this embodiment, one end of the first elastic member 32 abuts against the shoulder 39.

[0031] Reference Figure 3 , Figure 6 , Figure 7 and Figure 8The solenoid valve 100 also includes a valve housing 70 that houses the pin head 34. In this embodiment, the valve housing 70 is open at one end and closed at the other. The valve housing 70 is inserted into the other end of the cover 15. In this embodiment, the valve housing 70 also houses a first elastic member 32.

[0032] The valve housing 70 includes a shaft end plate 71. In this embodiment, the valve housing 70 includes a shaft end plate 71 at the closed shaft end. The shaft end plate 71 includes a through hole 72 extending axially through the shaft end plate 71 and for the rod 35 to pass through; an inner wall 72a defining the through hole 72 and having a diameter less than or equal to the maximum outer diameter of the pressurizing portion 39a; and an auxiliary groove 72b formed on the inner wall 72a, extending axially through the shaft end plate 71 and communicating with the through hole 72 to allow working fluid to flow between the pressurizing portion 39a and the shaft end plate 71 when the pressurizing portion 39a is in contact with the shaft end plate 71. In this embodiment, the axial length of the inner wall 72a is less than the axial length of the head portion 35a of the rod 35. Because the diameter of the head 35a of the rod 35 is smaller than the diameter of the tail 35b of the rod 35, and the axial length of the head 35a of the rod 35 is greater than the axial length of the inner wall 72a, the interference between the pin 33 and the shaft end plate 71 of the valve housing 70 is reduced, allowing the pin 33 and the moving valve core 31 to have a larger axial movement range. In this embodiment, the cross-section of the auxiliary groove 72b can be arc-shaped, rectangular, or polygonal. It is understood that the cross-section of the auxiliary groove 72b can also be other shapes, and this application does not limit this.

[0033] The shaft end plate 71 also includes a first end face 71a and a second end face 71b opposite to the first end face 71a. The first end face 71a is closer to the moving valve core 31 than the second end face 71b. The shaft end plate 71 also includes a first recess 76 formed axially from the first end face 71a, surrounding the through hole 72 and the auxiliary groove 72b. The first recess 76 communicates with the through hole 72 and the auxiliary groove 72b. In this embodiment, the inner diameter of the first recess 76 is larger than the inner diameter of the through hole 72. Thus, when the pressure at the open shaft end of the valve housing 70 increases, the working fluid flowing out from the through hole 72 and / or the auxiliary groove 72b can flow into the larger volume of the first recess 76, avoiding damage or deformation to the shaft end plate 71 and the cover 15 caused by the increased pressure.

[0034] In this embodiment, the valve housing 70 further includes an annular wall 74 extending axially from the edge of the shaft end plate 71. The shaft end plate 71 also includes a second cavity 77 extending outwardly along the first end face 71a and a third cavity 78 extending axially along the outer peripheral surface of the annular wall 74. The second cavity 77 communicates with the first cavity 76, and the third cavity 78 communicates with the second cavity 77. In this embodiment, the third cavity 78 extends out of the cover 15. Thus, the working fluid that flows into the valve housing 70 from the open shaft end and then out of the valve housing 70 through the through hole 72 and / or auxiliary groove 72b can sequentially flow through the first cavity 76, the second cavity 77, and the third cavity 78 before exiting the solenoid valve 100.

[0035] In this application, the pin 33 connected to the moving valve core 31 has the function of a valve core, and through the through hole 72 and auxiliary groove 72b of the rod body 35 of the pin 33 on the shaft end plate 71 of the valve housing 70, and the pressurizing part 39a which is housed in the valve housing 70 and gradually increases in axial outer diameter from the point where it continues with the rod body 35, the working fluid can still flow between the pressurizing part 39a and the shaft end plate 71 while the pressurizing part 39a is in contact with the shaft end plate 71. This makes it possible to form a smaller through hole on the valve housing 70 and to control the flow rate and speed of the working fluid with fewer components in the solenoid valve 100, thereby simplifying the structure of the solenoid valve 100.

[0036] Reference Figure 3 , Figure 4 and Figure 5 The solenoid valve 100 also includes a seal 41 fixed to the head of the pin 34. The seal 41 has an annular structure and protrudes from the connecting portion 36 in the outward direction. When the first elastic member 32 abuts against the second shoulder 39, the first elastic member 32 surrounds the outside of the seal 41.

[0037] The solenoid valve 100 also includes a valve member 60 with a valve seat function housed within the valve housing 70, and a second elastic member 68 abutting against the valve member 60 in a compressed state. In this embodiment, the valve member 60 has a cap-shaped structure. A liquid passage 63 is formed on the valve member 60. The liquid passage 63 can be blocked by the sealing member 41. In this embodiment, the other end of the first elastic member 32 abuts against the valve member 60, that is, both ends of the first elastic member 32 abut against the shoulder 39 and the valve member 60, respectively.

[0038] The valve component 60 includes a cap 60a that houses a pin head 34 and has an open end, and a brim 66 that surrounds the cap 60a at its opening and extends radially outward from it. The opening of the cap 60a faces the through hole 72. In this embodiment, the opening of the cap 60a also faces away from the liquid passage hole 63. The cap 60a forms a receiving cavity 67 with an open end. The receiving cavity 67 houses a first elastic member 32 and the pin head 34. The cap 60a includes an annular wall 61 and a connecting plate 62 connected to one axial end of the annular wall 61. The annular wall 61 and the connecting plate 62 together form the receiving cavity 67 with an open end. The liquid passage hole 63 is disposed on the connecting plate 62 and extends axially through the connecting plate 62. In this embodiment, the two ends of the first elastic member 32 abut against the connecting plate 62 and the shoulder 39, respectively.

[0039] In this embodiment, the second elastic member 68 abuts against the cap 66 in a compressed state, so that the cap 66 abuts against the shaft end plate 71. The force exerted by the second elastic member 68 on the cap 66 is greater than the force exerted by the first elastic member 32 on the valve member 60 when the solenoid valve 100 is not energized. Therefore, when the solenoid valve is not energized, the valve member 60 can be confined within the valve body 70 and onto the valve body 70. The force exerted by the second elastic member 68 on the cap 66 is also greater than the force exerted by the pin 33 on the valve member 60 when the solenoid valve 100 is energized. In this embodiment, the force exerted by the second elastic member 68 on the cap 66 is also greater than or equal to the sum of the force exerted by the pin 33 through the first seal 41 on the valve member 60 when the solenoid valve 100 is energized and the force exerted by the first elastic member 32 on the valve member 60 when the solenoid valve 100 is energized. Therefore, when the solenoid valve is energized, the valve member 60 can also be confined within the valve body 70 and onto the valve body 70.

[0040] The solenoid valve 100 also includes a sealing gasket 75, which is disposed in the cap 60a. In this embodiment, the sealing gasket 75 is a sealing ring and is disposed on the connecting plate 62. It is understood that the sealing gasket 75 may also be a gasket spring, etc., and this application does not limit this. The sealing gasket 75 is used to seal the gap between the valve member 60 and the valve body 70. Specifically, the valve body 70 also includes an annular limiting portion 73 that extends axially from the shaft end plate 71 to be received in the cap 60a and abuts against the cap 60a in a sealed state via the sealing gasket 75. In this embodiment, the limiting portion 73 extends axially from the second end face 71b of the shaft end plate 71. The limiting portion 73 abuts against the connecting plate 62 of the cap 60a in a sealed state via the sealing gasket 75. The limiting portion 73 and the cap 60a together form a receiving space for receiving the head portion 34 of the pin. Therefore, this invention can prevent the working fluid from flowing out of the receiving cavity 67 through the gap between the limiting part 73 and the cap body 60a and through the gap between the cap brim 66 and the shaft end plate 71.

[0041] The solenoid valve 100 also includes a main valve. The main valve includes a main valve seat 80 and an opening / closing part 90. The main valve seat 80 is integrally pressed into the open shaft end fixed to the valve body 70 in a substantially sealed state. An axially extending channel 81 is formed on the main valve seat 80. The opening / closing part 90 can reciprocate axially within the valve body 70 to contact or separate from the main valve seat 80, thereby opening and closing the main valve. When the opening / closing part 90 contacts the main valve seat 80, the main valve is in the closed state, and the working fluid cannot flow out of the solenoid valve 100 through the gap between the opening / closing part 90 and the main valve seat 80. When the opening / closing part 90 separates from the main valve seat 80, the main valve is in the open state, and the working fluid can flow out of the solenoid valve 100 through the gap between the opening / closing part 90 and the main valve seat 80. In this embodiment, the second elastic element 68 is compressed and rests between the cap 66 and the opening / closing part 90. The opening / closing part 90 can automatically contact or separate from the main valve seat 80 according to the pressure of the working fluid at the channel 81, thereby realizing the opening and closing of the main valve. When the pressure of the working fluid at the channel 81 is high, the opening / closing part 90 compresses the second elastic element 68, causing the opening / closing part 90 to separate from the main valve seat 80, at which time the main valve is open. When the pressure of the working fluid at the channel 81 is low, the second elastic element 68 abuts against the opening / closing part 90, causing the opening / closing part 90 to contact the main valve seat 80, at which time the main valve is closed.

[0042] The working process of solenoid valve 100 is described in detail below:

[0043] When the solenoid valve 100 is energized, the moving valve core 31 moves toward the cover 15, driving the pin 33 to compress the first elastic element 32 and causing the sealing element 41 fixed on the pin 33 to move toward the valve member 60 until the sealing element 41 abuts against the valve member 60. Since the force exerted by the second elastic element 68 on the cap 66 is greater than or equal to the sum of the force exerted by the pin 33 on the valve member 60 through the sealing element 41 when the solenoid valve 100 is energized and the force exerted by the first elastic element 32 on the valve member 60 when the solenoid valve 100 is energized, the valve member 60 can be confined within the valve body 70 by the second elastic element 68, thereby sealing the liquid passage 63 with the sealing element 41. At this time, the working fluid cannot flow out of the solenoid valve 100 through the liquid passage 63 and the through hole 72. The working fluid can flow out of the solenoid valve 100 through the gap between the opening / closing part 90 and the main valve seat 80 when the main valve is open.

[0044] Reference Figure 3 , Figure 4 , Figure 7 and Figure 8When the solenoid valve 100 is de-energized, under the reset force of the first elastic element 32, the pin 33 drives the sealing element 41 fixed on the pin 33 to move axially away from the valve element 60, thereby opening the liquid passage 63. Since the force exerted by the second elastic element 68 on the cap 66 is greater than the force exerted by the first elastic element 32 on the valve element 60 when the solenoid valve 100 is not energized, the valve element 60 can be confined within the valve body 70 by the second elastic element 68, preventing the working fluid from flowing out of the valve element 60 through the gap between the cap 66 and the valve body 70. When the sealing element 41 moves axially away from the valve element 60 to open the liquid passage 63, the pin 33 drives the moving valve core 31 to move axially away from the cover 15 until the moving valve core 31 resets, and the pin 33 also resets simultaneously. At this time, the pressurizing part 39a can abut against the second end face 71b of the shaft end plate 71 at the through hole 72, and the working fluid at the channel 81 can flow out of the solenoid valve 100 through the liquid passage 63, the auxiliary groove 72b, the first cavity 76, the second cavity 77, and the third cavity 78. At the same time, when the main valve is opened, the working fluid at the channel 81 can also flow out of the solenoid valve 100 through the gap between the opening / closing part 90 and the main valve seat 80.

[0045] It is understood that the valve member 60 is not confined within the valve body 70 by the force applied to the brim 66 by the second elastic member 68. The valve member 60 can be fixed within the valve body 70 by the interference fit between the annular wall 61 and the limiting part 73 of the valve body 70. In this case, the valve member 60 can support the first elastic member 32 and support and limit the second elastic member 68 through the brim 66. This application does not limit this.

[0046] It is understood that the solenoid valve 100 can regulate the flow rate and speed of the working fluid coming from the channel 81 through the through hole 72 by controlling the opening and closing of the liquid passage 63 and the degree of opening, thereby regulating the flow resistance of the working fluid and thus realizing continuous vibration reduction control.

[0047] Understandably, since the outer diameter of the pressure part 39a gradually increases axially from the point where it continues from the head 35a of the rod body 35, the space between the pressure part 39a and the inner wall 72a changes when the distance between the pressure part 39a and the shaft end plate 71 is different. Thus, the solenoid valve 100 can also adjust the flow rate and speed of the working fluid coming from the channel 81 through the through hole 72 by controlling the distance between the pressure part 39a and the shaft end plate 71, thereby adjusting the flow resistance of the working fluid and thus realizing continuous vibration damping control.

[0048] Another embodiment of this utility model provides a shock absorber. The shock absorber includes the aforementioned solenoid valve 100. In the shock absorber, the solenoid valve 100 is fluidly connected between two liquid chambers of the shock absorber. For example, one liquid chamber is connected to the passage 81 of the solenoid valve 100, while the working fluid flowing out of the solenoid valve 100 can flow into the other liquid chamber. The shock absorber can control the flow resistance and flow velocity of the working fluid between the two liquid chambers through the solenoid valve 100, thereby achieving continuous damping control of the shock absorber.

[0049] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A solenoid valve, comprising a movable valve core (31) capable of axial reciprocating motion and a first elastic element (32) for resetting the movable valve core (31) when the solenoid valve is not energized, characterized in that, The solenoid valve also includes: A pin (33) is connected to the moving valve core (31) and can reciprocate axially with the moving valve core (31) and has the function of a valve core. The pin (33) includes a rod (35) arranged axially and a pin head (34) extending from the rod (35). The rod (35) includes a tail (35b) connected to the moving valve core (31) and a head (35a) connected to the pin head (34). The pin head (34) includes a pressure portion (39a) that gradually increases in outer diameter axially from the point where it extends from the head (35a) of the rod. A valve housing (70) with one open end and the other closed end, housing the head of the pin (34), the valve housing (70) including a shaft end plate (71), the shaft end plate (71) including a through hole (72) extending axially through the shaft end plate (71) and for the rod (35) to pass through, an inner wall (72a) defining the through hole (72) and having a diameter less than or equal to the maximum outer diameter of the pressurizing part (39a), and an auxiliary groove (72b) formed on the inner wall (72a) extending axially through the shaft end plate (71) and communicating with the through hole (72) to allow working fluid to flow between the pressurizing part (39a) and the shaft end plate (71) when the pressurizing part (39a) is in contact with the shaft end plate (71).

2. The solenoid valve as described in claim 1, characterized in that, The cross-section of the auxiliary groove (72b) is arc-shaped, rectangular, or polygonal.

3. The solenoid valve as described in claim 1, characterized in that, The shaft end plate (71) further includes a first end face (71a) and a second end face (71b) opposite to the first end face (71a). The first end face (71a) is closer to the moving valve core (31) relative to the second end face (71b). The shaft end plate (71) also includes a first cavity (76) formed axially from the first end face (71a) surrounding the through hole (72) and the auxiliary groove (72b). The first cavity (76) communicates with the through hole (72) and the auxiliary groove (72b).

4. The solenoid valve as described in claim 3, characterized in that, The valve housing (70) further includes an annular wall (74) extending axially from the edge of the shaft end plate (71). The shaft end plate (71) further includes a second cavity (77) extending outward along the first end face (71a) and a third cavity (78) extending axially along the outer peripheral surface of the annular wall (74). The second cavity (77) is connected to the first cavity (76), and the third cavity (78) is connected to the second cavity (77).

5. The solenoid valve as described in claim 1, characterized in that, The diameter of the head (35a) of the rod (35) is smaller than the diameter of the tail (35b) of the rod (35), and the axial length of the head (35a) of the rod (35) is greater than the axial length of the inner wall (72a).

6. The solenoid valve as described in claim 1, characterized in that, The solenoid valve further includes a valve member (60) with a valve seat function housed within the valve housing (70). The valve member (60) includes a cap (60a) that houses the head of the pin and has an open end, and a brim (66) that surrounds the cap (60a) at the opening of the cap (60a), continues the cap (60a) and extends radially outward. The opening of the cap (60a) faces the through hole (72). The solenoid valve further includes a second elastic member (68) that abuts against the brim (66) in a compressed state, so that the brim (66) abuts against the shaft end plate (71).

7. The solenoid valve as described in claim 6, characterized in that, The force exerted by the second elastic element (68) on the cap (66) is greater than the force exerted by the pin on the valve (60) when the solenoid valve is energized.

8. The solenoid valve as described in claim 6, characterized in that, The solenoid valve further includes a connecting portion (36) that extends from the pressurizing portion (39a) and has a smaller outer diameter from the point of extension of the pressurizing portion (39a). The pressurizing portion (39a) forms a shoulder (39) at the connection between the pressurizing portion (39a) and the connecting portion (36). The first elastic member (32) abuts against the shoulder (39) and the valve member (60) at both ends. The force exerted by the first elastic member (32) on the valve member (60) is less than the force exerted by the second elastic member (68) on the brim (66).

9. The solenoid valve as described in claim 6, characterized in that, The solenoid valve also includes a sealing gasket (75), and the valve housing (70) also includes an annular limiting portion (73) extending axially from the shaft end plate (71) to be received in the cap body (60a) and abutting the cap body (60a) in a sealed state via the sealing gasket (75). The limiting portion (73) and the cap body (60a) together form a receiving space for receiving the head of the pin (34).

10. A shock absorber, characterized in that, Includes the solenoid valve as described in any one of claims 1 to 9.

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