Built-in pilot-operated type electromagnetic valve of shock absorber

Abstract

The utility model provides a built-in pilot-operated type electromagnetic valve of a shock absorber, and belongs to the technical field of automobile accessories. The problem that an existing shock absorber electromagnetic valve is not wide in application range is solved. The built-in pilot-operated type electromagnetic valve of the shock absorber comprises a shell, a static iron core, a movable iron core and a spring, the front end of the shell is fixedly connected with a front shell, the front shell is provided with an axial through hole and a plurality of radial through holes, a valve body is fixedly connected into the front shell, and the valve body is provided with an axial through hole and a radial through hole; a piston is arranged in the valve body, an abutting portion for abutting sealing of the piston is arranged on the inner wall of the outer end of the valve body, the movable iron core is connected with a valve needle extending into the piston, the piston is axially provided with an axial small hole for plugging a needle-shaped portion of the valve needle, and the piston is radially provided with a radial small hole communicated with the radial through hole in a penetrating mode. A liquid passing gap communicated with the radial small hole is formed between the valve needle and the inner wall of the piston, and an axial liquid passing hole communicated with the liquid passing gap axially penetrates through the movable iron core. The utility model has the advantages of wide application range, stable work and the like.

Description

Technical Field

[0001] This utility model belongs to the field of automotive parts technology, and relates to a solenoid valve, particularly a pilot-operated solenoid valve built into a shock absorber. Background Technology

[0002] As people's demands for vehicle handling and comfort continue to increase, vehicle shock absorbers are evolving from traditional mechanical methods towards electronic and electromagnetic approaches. Currently, there are four types of shock absorbers that balance handling and comfort: 1. Unidirectional dual-damping hydraulic shock absorbers; 2. CDC variable damping hydraulic shock absorbers; 3. Magnetorheological electromagnetic hydraulic shock absorbers; 4. Linear actuation electric cylinder shock absorbers. Among these, CDC variable damping hydraulic shock absorbers are relatively expensive and suitable for higher-end vehicles. Magnetorheological current hydraulic shock absorbers currently face challenges in addressing the cost and lifespan issues of magnetorheological fluid, preventing their mass production. Linear actuation electric cylinder shock absorbers are limited by insufficient power density, hindering widespread adoption; the power density issue needs to be addressed.

[0003] Therefore, domestic vehicles basically use two types of unidirectional damping hydraulic shock absorbers, which have a solenoid valve structure such as Figure 1 As shown, it includes a housing, a moving iron core, a spring, and a stationary iron core. The spring provides elastic force, causing the moving iron core to tend to resist the conical surface of the inner wall of the housing. The unidirectional two-damping hydraulic shock absorber solenoid valve corresponds to two hydraulic damping states through switching, thus matching the vehicle's driving needs. However, this method cannot achieve continuous change of hydraulic damping, has a limited applicability, and is not ideal for performance matching. Furthermore, when oil enters the housing axially, high-pressure oil acts on the moving iron core, causing the spring to fail and preventing it from opening. When oil enters the housing radially, due to the conical surface, high-pressure oil can overcome the spring force and open the moving iron core, resulting in insufficient operational stability. Additionally, its housing is a one-piece structure, making processing difficult and resulting in a low yield rate. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by providing a shock absorber-integrated pilot-operated solenoid valve that has a wide range of applications, good working stability, and is easy to process.

[0005] The objective of this utility model can be achieved through the following technical solution: A shock absorber with a built-in pilot-operated solenoid valve includes a housing and a stationary iron core, a moving iron core, and a spring located within the housing. The spring is located between the stationary iron core and the moving iron core and provides elastic force to keep the moving iron core away from the stationary iron core. A coil assembly is provided between the stationary iron core and the inner wall of the housing. The characteristic feature is that the rear end of the housing is a closed end, and the front end of the housing is fixedly connected to a front shell. The front shell has an axial through hole and several radially penetrating holes. A coil assembly is fixedly connected inside the front shell. The valve body has an axial through hole and a radial through hole connected to a corresponding radial hole. The valve body is equipped with a piston, and the inner wall of the outer end of the valve body has a contact part for the piston to abut and seal. The moving iron core is connected to a valve needle that extends into the piston. The piston has an axial small hole that is opened in the axial direction for the needle-shaped part of the valve needle to block. The piston has a radial small hole that is connected to the radial through hole in the radial direction. There is a liquid passage gap between the valve needle and the inner wall of the piston that is connected to the radial small hole. The moving iron core has an axial liquid passage hole that is connected to the liquid passage gap in the axial direction.

[0006] In the aforementioned shock absorber with a built-in pilot-operated solenoid valve, the stationary iron core is embedded with a magnetic shielding ring, one end of the spring abuts against the magnetic shielding ring, and the other end of the spring extends into the moving iron core and abuts against a step on the inner wall of the moving iron core.

[0007] In the aforementioned shock absorber with a built-in pilot-operated solenoid valve, the stationary iron core is fitted with a cylindrical guide tube, and the moving iron core extends into the guide tube.

[0008] In the aforementioned shock absorber with a built-in pilot-operated solenoid valve, the stationary iron core is threadedly connected to the guide cylinder.

[0009] In the aforementioned shock absorber with built-in pilot-operated solenoid valve, the coil assembly includes a coil frame and a coil. The coil frame is sleeved on the outside of the guide cylinder, and the outer wall of the coil frame has two radially outwardly convex rings. The coil located between the two convex rings is wound around the coil frame.

[0010] In the aforementioned shock absorber with built-in pilot-operated solenoid valve, the inner end of the valve body is connected to a support sleeve, the support sleeve has a step for the guide cylinder to abut against, the end of the support sleeve abuts against the nearest convex ring, and the outer wall of the support sleeve abuts against the inner wall of the housing.

[0011] In the aforementioned shock absorber-integrated pilot-operated solenoid valve, a radially protruding retaining ring is embedded in the inner wall of the valve body at its inner end.

[0012] In the aforementioned shock absorber with built-in pilot-operated solenoid valve, the outer wall of the piston is provided with at least two sealing rings, the valve body is provided with a sealing ring that seals the inner wall of the front housing, and the valve body is provided with a sealing ring that seals the inner wall of the support sleeve.

[0013] Compared with existing technologies, this shock absorber has a built-in pilot-operated solenoid valve that can continuously change the hydraulic damping, has a wide range of applications, is easy to process, and has good working stability. Attached Figure Description

[0014] Figure 1 This is a structural cross-sectional view of the existing one-way two-stage damping hydraulic shock absorber solenoid valve.

[0015] Figure 2 This is a cross-sectional view of the built-in pilot-operated solenoid valve of this shock absorber.

[0016] In the diagram, 1. Housing; 2. Stationary iron core; 3. Moving iron core; 31. Axial liquid passage hole; 4. Spring; 5. Front housing; 51. Radial hole; 6. Valve body; 61. Axial through hole; 62. Contact part; 63. Radial through hole; 7. Piston; 71. Axial small hole; 72. Radial small hole; 8. Valve needle; 9. Liquid passage gap; 10. Magnetic shielding ring; 11. Guide cylinder; 12. Wire frame; 121. Convex ring; 13. Coil; 14. Support sleeve; 15. Snap ring; 16. Sealing ring one; 17. Sealing ring two; 18. Sealing ring three. Detailed Implementation

[0017] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0018] like Figure 2 As shown, this shock absorber has a built-in pilot-operated solenoid valve, including a housing 1 and a stationary iron core 2, a moving iron core 3, and a spring 4 located within the housing 1. The spring 4 is located between the stationary iron core 2 and the moving iron core 3 and provides elastic force to keep the moving iron core 3 away from the stationary iron core 2. A coil assembly is provided between the stationary iron core 2 and the inner wall of the housing 1. The rear end of the housing 1 is a closed end, and the front end of the housing 1 is fixedly connected to a front shell 5. The front shell 5 has an axial through hole and four radially through holes 51. A valve body 6 is fixedly connected inside the front shell 5. The valve body 6 has an axial through hole 61 and a radial through hole 63 communicating with the corresponding radial holes 51. A piston 7 is provided inside the valve body 6. The inner wall of the outer end of the piston 7 has a contact part 62 for the piston 7 to abut and seal. The moving iron core 3 is connected to a valve needle 8 that extends into the piston 7. The piston 7 has an axial small hole 71 for the valve needle 8 to be sealed by the needle-shaped part. The piston 7 has a radial small hole 72 that communicates with the radial through hole 63. The outer wall of the piston 7 has a ring groove. The radial small hole 72 communicates with the radial through hole 63 through the ring groove, thus ensuring the effectiveness of the communication between the radial small hole 72 and the radial through hole 63. There is a liquid passage gap 9 between the valve needle 8 and the inner wall of the piston 7 that communicates with the radial small hole 72. The moving iron core 3 has an axial liquid passage hole 31 that communicates with the liquid passage gap 9.

[0019] When the built-in pilot-operated solenoid valve of this shock absorber is not energized, the spring 4 provides elastic force, causing the moving iron core 3 to tend to stay away from the stationary iron core 2. This causes the needle-shaped part of the valve needle 8 to block the axial small hole 71 of the piston 7, and the piston 7 to abut and seal against the abutting part 62 of the valve body 6. At this time, the axial through hole 61 is closed by the piston 7, and there is no possibility of hydraulic oil connected to the axial through hole 61 entering the interior of the moving iron core 3, causing the spring 4 to fail and fail to open. The radial through hole 63 is connected to the radial small hole 72. The hydraulic oil flowing into the radial through hole 63 enters the piston 7, flows through the fluid gap 9 and the axial fluid passage 31 to fill the inner cavity of the moving iron core 3 and the piston 7, so that the needle-shaped part of the valve needle 8 tends to block the axial small hole 71. Even if the hydraulic oil pressure in the radial through hole 63 increases, it will not cause the valve needle 8 to open. This is how it works. Good stability; when the built-in pilot-operated solenoid valve of this shock absorber is energized, the moving iron core 3 overcomes the elastic force of the spring 4 and moves closer to the stationary iron core 2. The needle-shaped part of the valve needle 8 disengages from the axial small hole 71. The hydraulic oil entering from the axial small hole 71 flows into the inner cavity of the piston 7, causing the pressure in the inner cavity of the piston 7 to decrease. A pressure difference is formed on both sides of the piston 7. The pressure difference causes the hydraulic oil pressure on the side of the axial small hole 71 to push the piston 7 away from the contact part 62. The hydraulic oil in the radial hole 51 and the radial through hole 63 is connected with the hydraulic oil in the axial through hole 61 to discharge oil. According to the magnitude of the current, the displacement of the moving iron core 3 can be determined, thereby determining the displacement of the piston 7 (determining the opening size between the piston 7 and the valve body 6), realizing the purpose of continuously changing the hydraulic damping, and has a wide range of applications; the front shell 5, valve body 6, and piston 7 are processed separately, which reduces the processing difficulty and has a high yield.

[0020] To elaborate further, the stationary iron core 2 is fitted with a magnetic shielding ring 10, one end of the spring 4 abuts against the magnetic shielding ring 10, and the other end of the spring 4 extends into the moving iron core 3 and abuts against a step on the inner wall of the moving iron core 3. The magnetic shielding ring 10 reduces delay, improves dynamic response speed, and enhances operational stability.

[0021] The stationary iron core 2 is fitted with a cylindrical guide tube 11, and the moving iron core 3 extends into the guide tube 11. In this way, the guide tube 11 guides the moving iron core 3, resulting in smooth displacement and good working stability. The stationary iron core 2 is threadedly connected to the guide tube 11, which allows adjustment of the axial position of the stationary iron core 2 within the guide tube 11, thereby adjusting the elastic force of the spring 4 and improving adaptability.

[0022] The coil assembly includes a wire frame 12 and a coil 13. The wire frame 12 is fitted around the outside of the guide cylinder 11. The outer wall of the wire frame 12 has two radially outward protruding rings 121. The coil 13 located between the two protruding rings 121 is wound around the wire frame 12. In this way, the wire frame 12 and the coil 13 are stably positioned and have good working stability.

[0023] A support sleeve 14 is connected to the inner end of the valve body 6. The support sleeve 14 has a step for the guide cylinder 11 to abut against. The end of the support sleeve 14 abuts against the nearest convex ring 121, and the outer wall of the support sleeve 14 abuts against the inner wall of the housing 1. The support sleeve 14 makes the structure stable, can compensate for the machining tolerances of the wire frame 12 and the valve body 6, and facilitates machining and assembly. A radially protruding retaining spring 15 is embedded in the inner wall of the inner end of the valve body 6. The retaining spring 15 is abutted against by the piston 7, which determines the maximum stroke of the piston 7 towards the moving iron core 3, avoids damage to the spring 4 due to overload, and has good working stability.

[0024] The outer wall of the piston 7 is fitted with at least two sealing rings 16. In this embodiment, there are three sealing rings 16. The valve body 6 is fitted with a sealing ring 17 that seals the inner wall of the front shell 5, and a sealing ring 18 that seals the inner wall of the support sleeve 14. This provides good sealing performance and good operational stability.

[0025] Contents not described in detail herein are existing technologies known to those skilled in the art. The specific embodiments described herein are merely illustrative examples illustrating the spirit of this invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this invention or exceeding the scope defined by the appended claims.

Claims

1. A shock absorber built-in pilot type electromagnetic valve comprising a housing (1) and a static core (2), a dynamic core (3), a spring (4) located in the housing (1), said spring (4) being located between the static core (2) and the dynamic core (3) and providing a spring force to make the dynamic core (3) keep a tendency to move away from the static core (2), a coil assembly being provided between the static core (2) and the inner wall of the housing (1), characterized in that, The rear end of the shell (1) is a closed end, and a front shell (5) is fixedly connected to the front end of the shell (1), wherein the front shell (5) has an axial through hole and a plurality of radial through holes (51), a valve body (6) is fixedly connected in the front shell (5), the valve body (6) has an axial through hole (61) and a radial through hole (63) communicating with the corresponding radial hole (51), a piston (7) is arranged in the valve body (6), and the outer end wall of the valve body (6) has an abutting portion (62) for abutting sealing of the piston (7), the moving iron core (3) is connected with a valve needle (8) extending into the piston (7), the piston (7) is axially provided with an axial small hole (71) for plugging of a needle-shaped portion of the valve needle (8), the piston (7) is radially provided with a radial small hole (72) communicating with the radial through hole (63), and the valve needle (8) and the inner wall of the piston (7) have a liquid passing gap (9) communicating with the radial small hole (72), and the moving iron core (3) is axially provided with an axial liquid passing hole (31) communicating with the liquid passing gap (9).

2. The built-in pilot solenoid valve for a shock absorber according to claim 1, wherein The static iron core (2) is embedded with a magnetic isolation ring (10), one end of the spring (4) abuts against the magnetic isolation ring (10), and the other end of the spring (4) extends into the moving iron core (3) and abuts against a step in the inner wall of the moving iron core (3).

3. The built-in pilot solenoid valve for a shock absorber according to claim 2, characterized in that The static iron core (2) is sleeved with a guide cylinder (11) in a cylindrical shape, and the moving iron core (3) extends into the guide cylinder (11).

4. The built-in pilot solenoid valve for a shock absorber according to claim 3, characterized in that The static iron core (2) is threadedly connected with the guide cylinder (11).

5. The built-in pilot solenoid valve for a shock absorber according to claim 4, wherein The coil assembly comprises a coil holder (12) and a coil (13), the coil holder (12) is sleeved outside the guide cylinder (11), the outer wall of the coil holder (12) has two radially outwardly protruding convex rings (121), and the coil (13) is wound between the two convex rings (121).

6. The built-in pilot solenoid valve for a shock absorber according to claim 5, wherein The inner end of the valve body (6) is connected with a support sleeve (14), the support sleeve (14) has a step for abutting against the guide cylinder (11), the end portion of the support sleeve (14) abuts against the proximal convex ring (121), and the outer wall of the support sleeve (14) abuts against the inner wall of the shell (1).

7. The built-in pilot solenoid valve of a shock absorber according to claim 6, wherein The inner wall of the inner end of the valve body (6) is embedded with a radial protruding circlip (15).

8. The built-in pilot solenoid valve for a shock absorber according to claim 7, characterized in that The outer wall of the piston (7) is embedded with at least two sealing rings I (16), the valve body (6) is embedded with a sealing ring II (17) sealing against the inner wall of the front shell (5), and the valve body (6) is embedded with a sealing ring III (18) sealing against the inner wall of the support sleeve (14).

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