Solenoid valve and shock absorber comprising same

Abstract

The utility model relates to an electromagnetic valve and a shock absorber comprising the electromagnetic valve, which can simplify the structure of the electromagnetic valve and simplify the assembly of the electromagnetic valve. The electromagnetic valve comprises a valve sleeve; the movable valve element is contained in the valve sleeve and can do axial reciprocating motion relative to the valve sleeve, and a groove which extends in the axial direction and penetrates through the movable valve element in the axial direction is formed in the peripheral wall of the movable valve element; the first cavity and the second cavity are located on the two opposite sides of the movable valve element, are separately arranged in the axial direction and are both communicated with the groove; the pin shaft is connected to the movable valve element, can perform axial reciprocating motion along with the movable valve element and has the function of a valve element; the pin shaft comprises an axial through hole and a radial hole; the axial through hole extends in the axial direction, penetrates through the pin shaft, is located outside the groove and is separated from the groove; the radial hole extends from the pin shaft to the outer diameter side and communicates the axial through hole with the second cavity; the pilot chamber is located on the side, away from the movable valve element, of the pin shaft and can be communicated with the axial through hole.

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] Automotive solenoid valves achieve continuous damping control by frequently adjusting the pressure of the working fluid within the shock absorber. This allows for timely and continuous damping control based on vehicle speed and road conditions, thereby improving the vehicle's smoothness, comfort, and safety. Currently, a solenoid valve includes a pilot valve core housed in a pilot chamber, a separate rod that drives the pilot valve core axially, a moving valve core with the rod fixed in place via a ring riveting process and capable of reciprocating axial movement, a bearing fitted onto the upper end of the rod, and a receiving cavity formed between the bearing and the moving valve core. Through holes are formed in the pilot valve core, rod, and bearing, connecting the pilot chamber and the receiving cavity. This allows the working fluid in the pilot chamber to flow into the receiving cavity through the through holes when the moving valve core drives the rod, reducing the impact of the working fluid during the movement of the moving valve core and rod. However, the structure and assembly of solenoid valves are 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 and simplify the assembly of the solenoid valve.

[0004] Therefore, the first aspect of this application provides a solenoid valve, including a valve sleeve, the solenoid valve further including: a movable valve core housed within the valve sleeve and capable of axial reciprocating relative to the valve sleeve, the outer peripheral wall of the movable valve core having a groove extending axially and penetrating the movable valve core axially; a first cavity and a second cavity located on opposite sides of the movable valve core and axially separated and connected to the groove; a pin connected to the movable valve core and capable of axial reciprocating with the movable valve core and having the function of a valve core, the pin including an axial through hole extending axially through the pin and outside the groove and separated from the groove, and a radial hole extending from the outer diameter side of the pin and communicating with the axial through hole and the second cavity; and a pilot chamber located on the side of the pin away from the movable valve core and communicating with the axial through hole; wherein the axial through hole, the radial hole, the second cavity, and the groove together form a channel connecting the first cavity and the pilot chamber, so that when the movable valve core and the pin move, the working fluid can flow between the pilot chamber and the first cavity through the channel.

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

[0006] In some embodiments, the valve sleeve includes a closed shaft end, and the first cavity is defined by the closed shaft end of the valve sleeve and the moving valve core.

[0007] In some embodiments, a radial hole is provided at the connection between the pin and the moving valve core and is housed in a second cavity.

[0008] In some embodiments, the solenoid valve further includes a valve housing forming a pilot chamber, the valve housing including a through hole extending axially and penetrating the valve housing, the pin including a rod body axially fixed to the moving valve core and passing through the through hole, the rod body including a tail portion connected to the moving valve core and a head portion with a diameter smaller than the tail portion of the rod body such that a first shoulder is formed at the connection with the tail portion of the rod body, the maximum outer diameter of the first shoulder being larger than the inner diameter of the through hole, such that the first shoulder can limit the distance of the moving valve core away from the valve sleeve.

[0009] In some embodiments, the solenoid valve further includes a valve housing, the valve housing including a through hole extending axially and penetrating the valve housing, and a pin including a rod body fixed axially to the moving valve core and passing through the through hole and a pin head extending from the rod body. The pin head includes a pressure portion whose outer diameter gradually increases from the point where it extends from the rod body, and the maximum outer diameter of the pressure portion is greater than the inner diameter of the through hole, so that the pressure portion can limit the distance of the moving valve core toward the valve sleeve.

[0010] In some embodiments, the tail end of the valve sleeve includes an inner protrusion formed by the end face of the tail end of the valve sleeve protruding axially inward, the inner protrusion being used to limit the distance of the moving valve core toward the valve sleeve.

[0011] In some embodiments, the size of the first cavity increases as the moving valve core moves away from the tail end of the valve sleeve, and the size of the second cavity decreases as the moving valve core moves away from the tail end of the valve sleeve, so as to maintain the total volume of the first cavity and the second cavity unchanged or reduce the rate of change of the total volume; there are two or more grooves, and they are arranged at intervals along the circumference of the moving valve core.

[0012] In some embodiments, the solenoid valve further includes: a valve housing forming a pilot chamber, the valve housing including a through hole extending axially through the valve housing; a valve member having a valve seat function housed within the valve housing, the valve member including a cap having a pin head and an open end thereof, and a cap brim extending radially outward around the cap and continuing with the cap at the opening of the cap, the opening of the cap facing the through hole; and a second elastic member abutting the cap brim in a compressed state such that the cap brim abuts the valve housing axially.

[0013] In some embodiments, the solenoid valve further includes a seal, and the valve housing further includes an annular limiting portion extending axially from the valve housing, housed in a cap body, and abutting the cap body in a sealed state via the seal. 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 and is connected to the groove on the moving valve core through the axial through hole on the pin, connecting the pilot chamber to the first cavity on the side of the moving valve core away from the pin. Therefore, when the moving valve core and the pin move, the working fluid can flow between the pilot chamber and the first cavity, reducing the influence of the working fluid when the moving valve core and the pin move. Thus, the influence of the working fluid when the moving valve core and the pin move can be reduced through a simple structure, simplifying the structure of the solenoid valve and simplifying the assembly 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 illustrates the valve sleeve, pin, gasket, and valve parts.

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

[0022] Figure 6 yes Figure 4 A plan view of the components shown;

[0023] Figure 7 yes Figure 6 A schematic diagram of the BB cross-section of the component shown. Detailed Implementation

[0024] The technical solutions in the embodiments of this utility model will now be described with reference to the accompanying drawings.

[0025] refer to Figure 1 and Figure 2 An embodiment of the present invention provides a solenoid valve 100 comprising a housing 11, a connector 13 fixed to one end of the housing 11, a cover 15 fixed to the other end of the housing 11, and a valve housing 70 inserted into one end of the cover 15. A movable valve core is disposed within the housing 11. Figure 1 (Not shown). Connector 13 is used for connection to an external power source.

[0026] Reference Figure 2 and Figure 3 The solenoid valve 100 includes a coil 17 fixed within a housing 11. The coil 17 is electrically connected to terminals mounted within a connector 13. When the solenoid valve 100 is energized, the coil 17 is connected to an external power source via the connector 13 and generates a magnetic field.

[0027] Reference Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 The solenoid valve 100 further includes a valve sleeve 21 fixed within the housing 11, a movable valve core 31 housed within the valve sleeve 21 and capable of axial reciprocating relative to the valve sleeve 21, and a pin 33 connected to the movable valve core 31 and capable of axial reciprocating with the movable valve core 31. The valve sleeve 21 includes an open shaft end and a closed shaft end 24. The pin 33 extends out of the valve sleeve 21 through the open shaft end. The tail end of the valve sleeve 21 includes an inner protrusion 25 formed by the end face of the tail end of the valve sleeve 21 protruding axially inward, the inner protrusion 25 being used to limit the distance of the movable valve core 31 toward the valve sleeve 21. In this embodiment, the inner protrusion 25 is used to limit the distance of the movable valve core 31 toward the closed shaft end 24 of the valve sleeve 21. When the tail end of the moving valve core 31 abuts against the inner protrusion 25 or when there is a certain distance between the tail end of the moving valve core 31 and the inner protrusion 25, the first cavity 26 is jointly defined by the closed shaft end 24 of the valve sleeve 21, the inner protrusion 25, and the moving valve core 31, and the shape of the first cavity 26 is similar to an annular body. When the tail end of the moving valve core 31 does not abut against the inner protrusion 25, the shape of the first cavity 26 is equivalent to adding a columnar cavity to the aforementioned annular body. In this embodiment, the closed shaft end 24 is located at the tail end of the valve sleeve 21.

[0028] In this embodiment, the movable valve core 31 is driven by the magnetic field generated by the coil 17 to move axially within the valve sleeve 21. Grooves 31a are formed on the outer peripheral wall of the movable valve core 31, extending axially and penetrating the movable valve core 31. In this embodiment, there are two or more grooves 31a, arranged at intervals along the circumference of the movable valve core 31.

[0029] Located on opposite sides of the moving valve core 31, the solenoid valve 100 includes a first cavity 26 and a second cavity 27, axially separated and both connected to the groove 31a. The first cavity 26 is located on the side of the moving valve core 31 furthest from the pin 33. The first cavity 26 is defined by the closed shaft end 24 of the valve sleeve 21 and the moving valve core 31. The size of the first cavity 26 increases as the moving valve core 31 moves away from the tail end of the valve sleeve 21. The second cavity 27 is defined by the moving valve core 31 and the cover 15. The size of the second cavity 27 decreases as the moving valve core 31 moves away from the tail end of the valve sleeve 21. This maintains the total volume of the first cavity 26 and the second cavity 27 constant or reduces the rate of change of the total volume. It is understandable that the size of the first cavity 26 decreases as the moving valve core 31 approaches the tail end of the valve sleeve 21, and the size of the second cavity 27 increases as the moving valve core 31 approaches the tail end of the valve sleeve 21.

[0030] The pin 33 includes an axial through hole 35 extending axially through the pin 33 and outside and separate from the groove 31a, and a radial hole 35a extending from the pin 33 to the outer diameter side and communicating with the axial through hole 35 and the second cavity 27. Thus, the axial through hole 35 communicates with the first cavity 26 through the radial hole 35a, the second receiving cavity 27, and the groove 31a. In this embodiment, the radial hole 35a is located at the connection between the pin 33 and the moving valve core 31 and is received in the second cavity 27. It is understood that the radial hole 35a can also be located in other positions, as long as the radial hole 35a can communicate with the axial through hole 35 of the pin 33 and the second cavity 27; this application does not impose any limitations on this.

[0031] The pin 33 includes a rod body fixed axially to the movable valve core 31 and a pin head 34 extending from the rod body. The rod body of the pin 33 passes through the cover 15, and the pin head 34 is received in the valve housing 70. In this embodiment, the valve housing 70 includes a through hole 72 extending axially and penetrating the valve housing 70. Specifically, the valve housing 70 is a housing with one shaft end open and the other shaft end closed. The valve housing 70 includes a shaft end plate 71 through which the pin 33 passes, and the through hole 72 is formed on the shaft end plate 71 extending axially and penetrating the shaft end plate 71. The rod body of the pin 33 also passes through the through hole 72, so that the pin head 34 is received in the valve housing 70. In this embodiment, the rod body of the pin 33 is supported by a bushing 23 installed in the cover 15 to facilitate axial movement.

[0032] The rod of the pin 33 includes a tail portion connected to the movable valve core 31 and a head portion with a diameter smaller than the tail portion, such that a first shoulder 33a is formed at the connection point with the tail portion of the rod. The maximum outer diameter of the first shoulder 33a is larger than the inner diameter of the through hole 72, so that the first shoulder 33a can limit the distance of the movable valve core 31 from the valve sleeve 21. In this embodiment, the first shoulder 33a can limit the distance of the movable valve core 31 from the closed shaft end 24 of the valve sleeve 21. In this embodiment, the cover 15 can also limit the distance of the movable valve core 31 from the valve sleeve 21. It is understood that the way to limit the distance of the movable valve core 31 from the valve sleeve 21 can be either the first shoulder 33a or the cover 15, or it can be a combination of the first shoulder 33a and the cover 15; this application does not limit this. It is understood that the maximum outer diameter of the first shoulder 33a may be smaller than the inner diameter of the through hole 72, so that the first shoulder 33a can move axially within the through hole 72. This application does not impose any restrictions on this.

[0033] In this embodiment, the pin 33 functions as a valve core, so the displacement of the pin head 34 is directly affected by the electromagnetic force of the solenoid valve 100. Located on the side of the pin 33 away from the moving valve core 31, i.e., at the pin head 34, the solenoid valve 100 also includes a pilot chamber 76 connected to the axial through hole 35. That is, the solenoid valve 100 further includes a pilot chamber 76 located on the side of the pin 33 away from the moving valve core 31 and connected to the axial through hole 35. In this embodiment, the pilot chamber 76 is formed within the valve housing 70. The axial through hole 35, radial hole 35a, second cavity 27, and groove 31a together form a channel connecting the first cavity 26 and the pilot chamber 76, so that when the moving valve core 31 and the pin 33 move, the working fluid can flow between the pilot chamber 76 and the first cavity 26 through the channel.

[0034] The pin head 34 includes a pressure portion 39a that gradually increases in outer diameter along the axial direction from where it continues from the rod body. The maximum outer diameter of the pressure portion 39a is larger than the inner diameter of the through hole 72, so that the pressure portion 39a can also limit the distance of the moving valve core 31 toward the valve sleeve 21. It is understood that the way to limit the distance of the moving valve core 31 toward the valve sleeve 21 can be any one of the aforementioned inner protrusion 25 and pressure portion 39a, or it can be a combination of the inner protrusion 25 and pressure portion 39a. This application does not limit this.

[0035] The pin head 34 also includes a second shoulder 39 that extends from the pressure portion 39a and has a reduced outer diameter. In this embodiment, the pin head 34 also includes a connecting portion 34a that extends from the pressure portion 39a and has a reduced outer diameter, and forms a second shoulder 39 at the connection point with the pressure portion 39a.

[0036] In this embodiment, the solenoid valve 100 further includes a sealing gasket 41 mounted to the head of the pin 34, and a first elastic member 32 abutting against the second shoulder 39 and used to provide a restoring force to the pin 33 when the solenoid valve is not energized. In this embodiment, the sealing gasket 41 has an annular structure and protrudes from the connecting portion 34a in the outer diameter direction. In this embodiment, the first elastic member 32 is a conical helical spring or a cylindrical helical spring, such that the first elastic member 32 surrounds the outside of the sealing gasket 41 when the first elastic member 32 abuts against the second shoulder 39 and the valve member 60.

[0037] When the solenoid valve 100 is energized, the moving valve core 31 overcomes the restoring force of the first elastic element 32 and moves axially relative to the valve sleeve 21. Specifically, the moving valve core 31 moves axially toward the cover 15, causing the volume of the first cavity 26 to increase and the volume of the second cavity 27 to decrease. At the same time, the moving valve core 31 drives the pin 33 to move in the same direction as the moving valve core 31. During this process, the pin 33 compresses the first elastic element 32. Meanwhile, since the axial through hole 35, radial hole 35a, second cavity 27, and groove 31a together form a channel connecting the first cavity 26 and the pilot chamber 76, the working fluid in the pilot chamber 76 flows into the first cavity 26 through the axial through hole 35, radial hole 35a, second cavity 27, and groove 31a until the movement of the moving valve core 31 away from the closed shaft end 24 of the valve sleeve 21 is restricted by the sealing gasket 41 and the valve member 60.

[0038] When the solenoid valve 100 is de-energized, under the restoring force of the first elastic element 32, the pin 33 moves axially toward the valve sleeve 21, causing the moving valve core 31 to move in the same direction as the pin 33, resulting in a decrease in the volume of the first cavity 26 and an increase in the volume of the second cavity 27. Similarly, since the axial through hole 35, radial hole 35a, second cavity 27, and groove 31a together form a channel connecting the first cavity 26 and the pilot chamber 76, during this process, the working fluid in the first cavity 26 flows into the pilot chamber 76 through the groove 31a, second cavity 27, radial hole 35a, and axial through hole 35 until the moving valve core 31 is reset or the movement of the moving valve core 31 toward the closed shaft end 24 of the valve sleeve 21 is restricted by the inner protrusion 25 and / or the pressure part 39a.

[0039] refer to Figure 3 , Figure 4 and Figure 5 In this embodiment, the solenoid valve 100 further includes a valve member 60 with a valve seat function housed in the valve housing 70, and a second elastic member 68 that abuts against the valve member 60 in a compressed state.

[0040] In this embodiment, the other end of the first elastic member 32 abuts against the valve member 60. A liquid passage 63 is formed on the valve member 60. The liquid passage 63 can be sealed by the sealing gasket 41. In this embodiment, the valve member 60 has a cap-shaped structure. The valve member 60 includes a cap body 60a that houses the pin head 34 and has an open end, and a brim 66 that surrounds the cap body 60a at the opening of the cap body 60a, continues the cap body 60a, and extends radially outward. The cap body 60a forms a pilot chamber 76. The opening of the cap body 60a faces the through hole 72. In this embodiment, the opening of the cap body 60a also faces away from the liquid passage 63. The first elastic member 32 and the pin head 34 are housed in the cap body 60a, and the axial through hole 35 communicates with the liquid passage 63 or the pilot chamber 76. When the liquid passage 63 is blocked by the sealing gasket 41, the axial through hole 35 is connected to the liquid passage 63; when the liquid passage 63 is not blocked by the sealing gasket 41, the axial through hole 35 is connected to the pilot chamber 76.

[0041] In this embodiment, the cap body 60a has a structure with one shaft end open and the other shaft end closed. The cap body 60a includes an annular wall 61 and a connecting plate 62 connected to one shaft end of the annular wall 61. The annular wall 61 and the connecting plate 62 together form a receiving cavity 67 with one open end to accommodate the first elastic member 32 and the pin head 34. A liquid passage hole 63 is provided on the connecting plate 62 and passes through the connecting plate 62 axially. In this embodiment, one end of the first elastic member 32 abuts against the connecting plate 62, and the other end abuts against the second shoulder 39 of the pin head 34.

[0042] 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. In this embodiment, 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 100 is not energized, the valve member 60 can be confined within 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 greater than or equal to the sum of the force exerted by the pin 33 through the sealing gasket 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.

[0043] The solenoid valve 100 also includes a sealing element 75. The sealing element 75 is disposed within the cap 60a. In this embodiment, the sealing element 75 is a sealing ring and is disposed on the connecting plate 62. It is understood that the sealing element 75 can also be a gasket spring, etc., and this application does not limit this. The sealing element 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 extending axially from the valve body 70, housed within the cap 60a, and held in a sealed state by the sealing element 75. In this embodiment, the limiting portion 73 extends axially from the shaft end plate 71 into the receiving cavity 67. The limiting portion 73 and the cap 60a together form a receiving space for the receiving pin head 34. In this embodiment, the limiting portion 73 and the cap 60a together form a pilot chamber 76. The limiting part 73 abuts against the cap body 60a in a sealed state via the sealing member 75, that is, the limiting part 73 abuts against the cap body 60a in a sealed state via the sealing member 75. Thus, 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.

[0044] The solenoid valve 100 also includes a main valve, which comprises a main valve seat 80 and an opening / closing portion 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 portion 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 portion 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 portion 90 and the main valve seat 80. When the opening / closing portion 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 portion 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.

[0045] The working process of solenoid valve 100 is described in detail below:

[0046] 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 gasket 41 fixed on the pin 33 to move toward the valve member 60 until the sealing gasket 41 abuts against the valve member 60. During this process, the volume of the first cavity 26 increases, and the volume of the second cavity 27 decreases. Because the axial through hole 35 is connected to the pilot chamber 76, the working fluid in the pilot chamber 76 flows into the first cavity 26 through the axial through hole 35, the radial hole 35a, the second cavity 27, and the groove 31a, until the movement of the moving valve core 31 away from the closed shaft end 24 of the valve sleeve 21 is restricted by the sealing gasket 41 and the valve member 60. When the sealing gasket 41 holds the valve member 60, 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 gasket 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. Therefore, 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 gasket 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.

[0047] When the solenoid valve 100 is de-energized, under the restoring force of the first elastic element 32, the pin 33 drives the sealing gasket 41 fixed on the pin 33 to move axially away from the valve member 60, thereby opening the liquid passage 63. During this process, the volume of the first cavity 26 decreases, and the volume of the second cavity 27 increases. Similarly, because the axial through hole 35 is connected to the pilot chamber 76, the working fluid in the first cavity 26 flows into the pilot chamber 76 through the groove 31a, the second cavity 27, the radial hole 35a, and the axial through hole 35. 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 member 60 when the solenoid valve 100 is not energized, the valve member 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 member 60 through the gap between the cap 66 and the valve body 70. When the sealing gasket 41 moves axially away from the valve member 60 to open the fluid passage 63, the pin 33 drives the moving valve core 31 to move axially toward the closed shaft end 24 of the valve sleeve 21 until the moving valve core 31 returns to its original position, or the movement of the moving valve core 31 toward the closed shaft end 24 of the valve sleeve 21 is restricted by the inner protrusion 25 and / or the pressure part 39a, and the pin 33 also returns to its original position at the same time. At this time, the working fluid can flow out of the solenoid valve 100 through the fluid passage 63 and the through hole 72, and can also 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.

[0048] It is understood that the valve component 60 is not confined within the valve housing 70 by the force applied to the brim 66 by the second elastic member 68. The valve component 60 can be fixed within the valve housing 70 by the interference fit between the annular wall 61 and the limiting part 73 of the valve housing 70. In this case, the valve component 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 impose any restrictions on this.

[0049] 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.

[0050] 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 shock absorption control.

[0051] In this application, the pin 33 connected to the moving valve core 31 has the function of a valve core, and is connected to the groove 31a on the moving valve core 31 through the axial through hole 35 on the pin 33, connecting the pilot chamber 76 to the first cavity 26 on the side of the moving valve core 31 away from the pin 33. Therefore, when the moving valve core 31 and the pin 33 move, the working fluid can flow between the pilot chamber 76 and the first cavity 26, reducing the influence of the working fluid when the moving valve core 31 and the pin 33 move. Thus, the influence of the working fluid when the moving valve core 31 and the pin 33 move can be reduced through a simple structure, simplifying the structure of the solenoid valve 100 and simplifying the assembly of the solenoid valve 100.

[0052] This application further reduces the influence of the working fluid on the movement of the moving valve core 31 and the pin 33 by keeping the total volume of the first cavity 26 and the second cavity 27 constant or reducing the rate of change of the total volume.

[0053] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are 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 valve sleeve (21), characterized in that, The solenoid valve also includes: A movable valve core (31) is housed within the valve sleeve (21) and is capable of axial reciprocating relative to the valve sleeve (21). A groove (31a) is formed on the outer peripheral wall of the movable valve core (31) extending axially and penetrating the movable valve core (31) axially. The first cavity (26) and the second cavity (27) are located on opposite sides of the moving valve core (31) and are separated along the axial direction and are both connected to the groove (31a). 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 an axial through hole (35) extending axially through the pin (33) and outside the groove (31a) and separated from the groove (31a), and a radial hole (35a) extending from the pin (33) to the outer diameter side and communicating the axial through hole (35) with the second cavity (27); and A pilot chamber (76) located on the side of the pin (33) away from the moving valve core (31) and connected to the axial through hole (35). The axial through hole (35), the radial hole (35a), the second cavity (27), and the groove (31a) together form a channel connecting the first cavity (26) and the pilot chamber (76), so that when the moving valve core (31) and the pin (33) move, the working fluid can flow between the pilot chamber (76) and the first cavity (26) through the channel.

2. The solenoid valve as described in claim 1, characterized in that, The valve sleeve (21) includes a closed shaft end (24), and the first cavity (26) is defined by the closed shaft end (24) of the valve sleeve (21) and the moving valve core (31).

3. The solenoid valve as described in claim 1, characterized in that, The radial hole (35a) is located at the connection between the pin (33) and the moving valve core (31) and is housed in the second cavity (27).

4. The solenoid valve as described in claim 1, characterized in that, The solenoid valve further includes a valve housing (70) forming the pilot chamber (76). The valve housing (70) includes a through hole (72) extending axially and penetrating the valve housing (70). The pin (33) includes a rod body that is axially fixed to the moving valve core (31) and passes through the through hole (72). The rod body includes a tail portion connected to the moving valve core (31) and a head portion with a diameter smaller than the tail portion of the rod body, such that a first shoulder portion (33a) is formed at the connection with the tail portion of the rod body. The maximum outer diameter of the first shoulder portion (33a) is larger than the inner diameter of the through hole (72), so that the first shoulder portion (33a) can limit the distance of the moving valve core (31) from the valve sleeve (21).

5. The solenoid valve as described in claim 1, characterized in that, The solenoid valve further includes a valve housing (70), the valve housing (70) including a through hole (72) extending axially and penetrating the valve housing (70), the pin (33) including a rod body fixed axially to the moving valve core (31) and passing through the through hole (72) and a pin head (34) continuing with the rod body, the pin head (34) including a pressure part (39a) whose outer diameter gradually increases axially from the point where it continues with the rod body, the maximum outer diameter of the pressure part (39a) being greater than the inner diameter of the through hole (72), so that the pressure part (39a) can limit the distance of the moving valve core (31) toward the valve sleeve (21).

6. The solenoid valve as described in claim 1, characterized in that, The tail end of the valve sleeve (21) includes an inner protrusion (25) formed by the end face of the tail end of the valve sleeve (21) protruding inward along the axial direction. The inner protrusion (25) is used to limit the distance of the moving valve core (31) toward the valve sleeve (21).

7. The solenoid valve as described in claim 1, characterized in that, The size of the first cavity (26) increases as the moving valve core (31) moves away from the tail end of the valve sleeve (21), and the size of the second cavity (27) decreases as the moving valve core (31) moves away from the tail end of the valve sleeve (21), so as to maintain the total volume of the first cavity (26) and the second cavity (27) unchanged or reduce the rate of change of the total volume; the groove (31a) is two or more, and is arranged at intervals along the circumference of the moving valve core (31).

8. The solenoid valve as described in claim 1, characterized in that, The solenoid valve also includes: A valve housing (70) forming the pilot chamber (76) includes a through hole (72) extending axially and penetrating the valve housing (70). A valve member (60) having a valve seat function is housed within the valve housing (70). The valve member (60) includes a cap (60a) that houses the pin head (34) and is open at one 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 second elastic member (68) abuts against the cap brim (66) in a compressed state, so that the cap brim (66) abuts against the valve body (70) axially.

9. The solenoid valve as described in claim 8, characterized in that, The solenoid valve also includes a seal (75), and the valve housing (70) also includes an annular limiting portion (73) that extends axially from the valve housing (70) and is received in the cap (60a) and abuts against the cap (60a) in a sealed state via the seal (75). The limiting portion (73) and the cap (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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