Double-spring structure of electromagnetic valve for shock absorber

Abstract

The utility model discloses a double-spring structure of an electromagnetic valve for a shock absorber, which relates to the technical field of electromagnetic valves and comprises a valve sleeve, a valve seat fixedly arranged at one axial end of the valve sleeve and fixedly connected in the valve sleeve in a tight assembly manner, and a spring arranged in the valve sleeve, a pilot sleeve is arranged at the corresponding position of the other side of the valve seat; the valve element is axially and movably arranged in an inner cavity formed by the valve sleeve and the pilot sleeve, and a spring seat which is in a cap shape with a circle of flanging is movably arranged in the inner cavity; the hard spring and the soft spring are arranged on the two sides of the spring seat respectively, the other end of the soft spring abuts against the center area of the pilot sleeve, and the spring seat extrudes and configures one end of the soft spring in the coaxial direction. The product reliability is poor, the processing cost is high, and the production takt is long.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic valve technology, specifically to a double-spring structure for an electromagnetic valve used in shock absorbers. Background Technology

[0002] When a shock absorber solenoid valve is operating normally, the valve core needs to be in the open state. The magnitude of the opening pressure often depends on the preload of the stiff spring. However, the stiff spring in a shock absorber solenoid valve is a high-stiffness helical spring, and its preload is affected by the spring assembly height during assembly. Furthermore, the assembly height is a mating dimension with significant variations. Therefore, the consistency of the opening point of the shock absorber solenoid valve is poor. Large deviations can result in a high-pressure opening point, reducing the shock absorber's comfort. To improve shock absorber comfort, many similar products on the market employ a double-spring design, where, when the valve core is closed, the pressure difference between the valve core end face and the spring seat end face is significant. By spacing them at a preset distance, when the valve core is closed (the valve core is in contact with and sealed to the valve seat end face, and the oil does not flow to the oil outlet), the spring seat end face is suspended, and the hard spring and soft spring are connected in series. At this time, the spring preload force on the valve core is mainly provided by the soft spring, which reduces the spring preload force on the valve core. The soft and hard springs are in series, and will always be kept at a small spring force before the valve core end face contacts the spring seat end face, that is, before the displacement of the valve core from the valve seat is less than the preset distance. This ensures that the valve can be opened under low pressure, realizes the low pressure opening capability under low current, and improves the comfort of the shock absorber.

[0003] The dual-spring structure of existing shock absorber solenoid valves on the market is affected by the machining accuracy of sub-parts and the dimensional discrepancies in assembly. To ensure the consistency of opening pressure, the consistency of spring preload is required. Therefore, it is necessary to place adjusting shims of different sizes in the gap between the valve seat and the valve sleeve to make the preset distance between the valve core end face and the spring seat end face approach the ideal value. This assembly and shim calculation and selection method is relatively complicated and has high requirements for the equipment used, resulting in poor product reliability, high processing costs, and long production cycles. Utility Model Content

[0004] The purpose of this utility model is to provide a double-spring structure for a solenoid valve for shock absorbers, so as to solve the problems mentioned in the background art, which are that the existing assembly and gasket calculation and selection methods for shock absorber solenoid valves are cumbersome, have high requirements for the equipment used, resulting in poor product reliability, high processing costs, and long production cycles.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a double-spring structure for a solenoid valve used in shock absorbers, comprising a valve sleeve, and further comprising:

[0006] A valve seat is fixedly disposed at one end of the valve sleeve along the axial direction and is fixedly connected to the valve sleeve by a tight assembly. A pilot sleeve is disposed at the corresponding position on the other side of the valve seat.

[0007] The valve core is axially movable in the inner cavity formed by the valve sleeve and the pilot sleeve, and a spring seat in the shape of an outwardly turned-out hat is movably disposed in the inner cavity;

[0008] A hard spring and a soft spring are respectively disposed on both sides of the spring seat, and the other end of the soft spring abuts against the central area of ​​the pilot sleeve. The spring seat is coaxially pressed against one end of the soft spring.

[0009] Adjusting shims are positioned between the valve sleeve and the pilot sleeve.

[0010] Preferably, the pilot sleeve is an integrally machined annular sleeve with at least one oil passage hole at its center.

[0011] Preferably, the outer barrel of the spring seat is axially inserted into the inner ring of the hard spring, with one end of the hard spring abutting against the outer flange of the spring seat and the other end abutting against the valve core.

[0012] Preferably, the valve sleeve is fixedly connected to the valve seat and the pilot sleeve, the valve core can move axially in its cavity, and the outer circle of the valve sleeve contains at least one through oil passage hole.

[0013] Preferably, the outer circle of the valve core contains at least one pressure equalizing groove and has at least one central oil passage hole, and the end face contains an oil passage groove.

[0014] Preferably, the valve core is provided with a communicating damping hole along the axial direction of the valve sleeve.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] This invention provides a double-spring structure for a solenoid valve used in shock absorbers, which can achieve low-pressure opening capability, simplify the assembly and selection process, improve the reliability of the solenoid valve, reduce the production cost of the solenoid valve, and shorten the production cycle. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of the internal structure of the double-spring solenoid valve for the shock absorber of this utility model.

[0018] Figure 2 This is a front view of the double-spring structure of the electromagnetic valve for the shock absorber of this utility model.

[0019] Figure 3 This is a rear view of the double-spring structure of the electromagnetic valve for the shock absorber of this utility model.

[0020] Figure 4 This is a schematic diagram of the internal structure of the double-spring structure of the electromagnetic valve for the shock absorber of this utility model.

[0021] In the diagram: 1. Valve seat; 2. Valve sleeve; 3. Hard spring; 4. Pilot sleeve; 5. Soft spring; 6. Adjusting shim; 7. Spring seat; 8. Valve core. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] Please see Figure 1-4 One embodiment of this utility model provides: a double-spring structure for a solenoid valve used in shock absorbers, including a valve sleeve 2, and further comprising:

[0024] Valve seat 1 is fixedly installed at one end of valve sleeve 2 in the axial direction and is fixedly connected to valve sleeve 2 by tight assembly. A pilot sleeve 4 is provided at the corresponding position on the other side of valve seat 1.

[0025] The valve core 8 is axially movable in the inner cavity formed by the valve sleeve 2 and the pilot sleeve 4, and a spring seat 7 in the shape of an outwardly turned-out hat is movably arranged in the inner cavity.

[0026] Hard spring 3 and soft spring 5 are respectively arranged on both sides of spring seat 7. The other end of soft spring 5 abuts against the central area of ​​pilot sleeve 4. Spring seat 7 is coaxially pressed against one end of soft spring 5.

[0027] Adjusting shim 6 is positioned between valve sleeve 2 and pilot sleeve 4.

[0028] The valve seat 1, valve sleeve 2, and pilot sleeve 4 are fixedly connected to form an inner cavity, which is used to accommodate the hard spring 3, soft spring 5, adjusting shim 6, spring seat 7, and valve core 8. The thickness of the adjusting shim 6 is adjustable. The hard spring 3 and soft spring 5, together with the spring seat 7, form a double spring power source. The double spring power source generates an axial spring force on the valve core. The valve core 8 moves axially in the main stage cavity under the action of hydraulic pressure, and at the same time, it is subjected to the reverse axial action of the spring force of the double spring unit on the other side. When the spring force is greater than the hydraulic pressure, the valve core 8 contacts the valve seat 1 and stops moving. The adjusting shim 6 is located at the mating point of the valve sleeve 2 and the pilot sleeve 4. By using adjusting shims 6 of different thicknesses, the consistency and accuracy of the preload spring force of the double spring unit of different solenoid valves are ensured.

[0029] Please see Figure 1 The pilot sleeve 4 is a one-piece machined annular sleeve, containing at least one oil passage hole at its center. Please refer to [link / reference]. Figure 1The outer barrel of the spring seat 7 is axially inserted into the inner ring of the rigid spring 3. One end of the rigid spring 3 abuts against the outer flange of the spring seat 7, and the other end abuts against the valve core 8. Please refer to [link / reference]. Figure 1 The valve sleeve 2 is fixedly connected to the valve seat 1 and the pilot sleeve 4. The valve core 8 can move axially within its cavity. The outer circumference of the valve sleeve 2 contains at least one through oil passage hole. Please refer to [link / reference]. Figure 1 The valve core 8 has at least one pressure equalizing groove on its outer circumference and at least one central oil passage hole, and an oil passage groove on its end face. Please refer to [link / reference]. Figure 1 The valve core 8 has a connected damping hole along the axial direction of the valve sleeve 2.

[0030] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A double-spring structure for a solenoid valve used in a shock absorber, comprising a valve sleeve (2), characterized in that: Also includes: A valve seat (1) is fixedly installed at one end of the valve sleeve (2) in the axial direction and is fixedly connected to the valve sleeve (2) by a tight assembly. A pilot sleeve (4) is provided at the corresponding position on the other side of the valve seat (1). The valve core (8) is axially movable in the inner cavity formed by the valve sleeve (2) and the pilot sleeve (4), and a spring seat (7) in the shape of an outwardly turned-out hat is movably arranged in the inner cavity; Hard spring (3) and soft spring (5) are respectively arranged on both sides of the spring seat (7). The other end of the soft spring (5) abuts against the central area of ​​the pilot sleeve (4). The spring seat (7) presses one end of the soft spring (5) in the same direction. Adjusting shim (6), which is positioned between the valve sleeve (2) and the pilot sleeve (4).

2. The double-spring structure of a solenoid valve for a shock absorber according to claim 1, characterized in that: The pilot sleeve (4) is an integrally machined annular sleeve with at least one oil passage hole at the center.

3. The double-spring structure of a solenoid valve for a shock absorber according to claim 1, characterized in that: The outer barrel of the spring seat (7) is axially inserted into the inner ring of the hard spring (3), with one end of the hard spring (3) abutting against the outer flange of the spring seat (7) and the other end abutting against the valve core (8).

4. The double-spring structure of a solenoid valve for a shock absorber according to claim 1, characterized in that: The valve sleeve (2) is fixedly connected to the valve seat (1) and the pilot sleeve (4), and the valve core (8) can move axially in its cavity. The outer circle of the valve sleeve (2) contains at least one through oil passage hole.

5. The double-spring structure of a solenoid valve for a shock absorber according to claim 1, characterized in that: The outer circle of the valve core (8) contains at least one pressure equalization groove and at least one central oil passage hole, and the end face contains an oil passage groove.

6. The double-spring structure of a solenoid valve for a shock absorber according to claim 1, characterized in that: The valve core (8) is provided with a communicating damping hole along the axial direction of the valve sleeve (2).

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