Solenoid valve and shock absorber

Abstract

Provided are a solenoid valve and a shock absorber. The solenoid valve comprises: a coil (1) capable of generating a magnetic field when excited by an electric current; an armature (2), at least a part of which is circumferentially surrounded by the coil (1) and which is capable of moving in a first axial direction (X1) under the action of the magnetic field; a magnetic pole (3) located on the side of the armature (2) in the first axial direction (X1); an elastic member (4) axially disposed between the armature (2) and the magnetic pole (3); a push rod (5) connected to the armature (2) in a non-relatively movable manner and passing through the magnetic pole (3) in an axially relatively movable manner; and a pilot valve (6) comprising a pilot valve seat (62) and a pilot valve element (61), wherein when the coil (1) is energized, the armature (2) moves in the first axial direction (X1) against the elastic force of the elastic member (4) under the action of the magnetic field, and the push rod (5) is driven by the armature (2) to push the pilot valve element (61) against the pilot valve seat (62), such that the pilot valve (6) is closed. The solenoid valve and the shock absorber can reduce or even eliminate low-resistance overshoot.

Description

Electromagnetic valve and shock absorber TECHNICAL FIELD

[0001] The present application relates to an electromagnetic valve and a shock absorber. BACKGROUND

[0002] Electromagnetic valves are used to control the flow of medium in shock absorbers. CN110360261A discloses an electromagnetic valve for adjusting the damping of a shock absorber. Figure 1 is a sectional view of the electromagnetic valve of the prior art. As shown in Figure 1, when energized, the pilot spool 61’ abuts against the pilot valve seat 62’. In the low-speed damping state, the pilot spool 61’ and the pilot valve seat 62’ are not easy to separate, and pressure overshoot is prone to occur.

[0003] Therefore, the existing electromagnetic valve of the shock absorber is prone to the problem of low-speed overshoot.

[0004] SUMMARY

[0005] The present application aims to provide an electromagnetic valve that reduces or even eliminates low-speed overshoot.

[0006] One aspect of the present application provides an electromagnetic valve, comprising:

[0007] a coil capable of generating a magnetic field when excited by an electric current;

[0008] an armature at least partially surrounded by the coil in a circumferential direction and capable of moving in a first axial direction under the action of the magnetic field;

[0009] a magnetic pole located on one side of the armature in the first axial direction;

[0010] a resilient member arranged between the armature and the magnetic pole in the axial direction;

[0011] a push rod connected to the armature in a non-axially movable manner and passing through the magnetic pole in an axially movable manner; and

[0012] a pilot valve comprising a pilot valve seat and a pilot spool, wherein

[0013] when the coil is energized, the armature moves in the first axial direction against the elastic force of the resilient member under the action of the magnetic field, and the push rod pushes the pilot spool against the pilot valve seat under the driving of the armature, so that the pilot valve is closed.

[0014] According to an embodiment of the present application, when the coil is de-energized, the resilient member abuts against one of the armature and the magnetic pole, and the resilient member is out of contact with the other one of the armature and the magnetic pole.

[0015] According to an embodiment of the present application, the resilient member is fixedly connected to the one of the armature and the magnetic pole in contact.

[0016] According to an embodiment of the present application, the elastic member is a diaphragm spring.

[0017] According to an embodiment of the present application, when the coil is energized, one axial side of the elastic member abuts against the axial end surface of the armature, and the other axial side of the elastic member abuts against the axial end surface of the magnetic pole.

[0018] Another aspect of the present application provides a shock absorber including the electromagnetic valve according to any one of the above-described embodiments.

[0019] According to an embodiment of the present application, the elastic member is provided between the armature and the magnetic pole, and the armature is subjected to the elastic force of the elastic member in opposition to the electromagnetic force. Thus, the resultant force acting on the armature is small. The small resultant force on the armature is transmitted to the push rod, and then acts on the pilot spool which is pushed by the push rod. Therefore, the pushing force acting on the pilot spool is reduced. In this way, in the case of low-speed damping, the pilot spool and the pilot valve seat are more easily separated, thereby reducing or even eliminating low-speed overshoot. BRIEF DESCRIPTION OF DRAWINGS

[0020] FIG. 1 is a cross-sectional view of a prior art electromagnetic valve.

[0021] FIG. 2 is a cross-sectional view of an electromagnetic valve according to an embodiment of the present application when the coil is energized.

[0022] FIG. 3 is a cross-sectional view of an electromagnetic valve according to an embodiment of the present application when the coil is de-energized. DETAILED DESCRIPTION

[0023] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The embodiments described below are provided by way of example so that those skilled in the art can completely understand the spirit of the present disclosure. The present disclosure is not limited to the embodiments described below, but can be implemented in other forms. In order to clearly illustrate the present disclosure, parts irrelevant to the description are omitted in the accompanying drawings.

[0024] Unless otherwise specified, the terms "axial", "radial" and "circumferential" in this document mean the axial, radial and circumferential directions of the electromagnetic valve, respectively. Any directional terms "upper", "lower", "left", "right" appearing in this document are the directions shown in the drawings, and do not limit the specific structure of the present application.

[0025] Fig. 2 is a sectional view of the electromagnetic valve according to the embodiment of the present application when the coil is energized, and Fig. 3 is a sectional view of the electromagnetic valve according to the embodiment of the present application when the coil is de-energized. As shown in Figs. 2 and 3, the electromagnetic valve can include a coil 1, an armature 2, a magnetic pole 3, a resilient member 4, a push rod 5, and a pilot valve 6. The coil 1 is capable of generating a magnetic field when excited by an electric current. At least a portion of the armature 2 is circumferentially surrounded by the coil 1 and is capable of moving along a first axial direction X1 under the action of the magnetic field. The magnetic pole 3 is located on one side of the armature 2 in the first axial direction X1, and the magnetic pole 3 is also referred to as a C pole (center pole). The push rod 5 is connected to the armature 2 in a non- relatively movable manner and passes through the magnetic pole 3 in an axially relatively movable manner. The pilot valve 6 includes a pilot valve seat 62 and a pilot valve spool 61. When the coil 1 is energized, the armature 2 moves along the first axial direction X1 under the action of the magnetic field against the elastic force of the resilient member 4, and the push rod 5 pushes the pilot valve spool 61 against the pilot valve seat 62 under the drive of the armature 2.

[0026] According to the embodiment of the present application, the resilient member 4 is arranged between the armature 2 and the magnetic pole 3, and the armature 2 is subjected to the elastic force of the resilient member 4 which is opposite to the electromagnetic force. Therefore, the resultant force acting on the armature 2 is small. The small resultant force on the armature 2 is transmitted to the push rod 5, and then acts on the pilot valve spool 61 which is pushed by the push rod 5. Therefore, the pushing force acting on the pilot valve spool 61 is reduced. In this way, in the case of low-speed damping, the pilot valve spool 61 and the pilot valve seat 62 are more easily separated, thereby reducing or even eliminating low-speed overshoot.

[0027] The electromagnetic valve further includes a main valve 7 including a main valve spool 71 and a main valve seat 72. The pilot valve 6 further includes a spring 63 which abuts against one side (the lower side shown in Fig. 1) of the pilot valve spool 61 in the first axial direction X1 and, when compressed, applies an elastic force to the pilot valve spool 61 to lift the pilot valve spool 61 away from the pilot valve seat 62. The pilot valve seat 62 is an annular protrusion formed on an end face of the main valve spool 71.

[0028] When the coil 1 is de-energized, i.e., the electric current is 0, the spring 63 pushes the pilot valve spool 61 to move to an upper stop position in the second axial direction X2, so that there is a small leakage passage in the overflow passage. Therefore, a certain back pressure is formed to act on the main valve spool 71, thereby providing the required damping force at 0A.

[0029] When the active mode is required, the coil 1 is provided with a current of 0.4A or more, and the push rod 5 pushes the pilot valve spool 61 away from the upper stop position and abuts against the pilot valve seat 62, so that the normal damping force adjustment is achieved.

[0030] In the case of low-speed damping, the elastic force of the elastic member 4 acts on the armature 2, the push rod 5, and the pilot spool 61 in that order. Thus, in the state in which the main valve 7 is closed, when the pressure of the fluid medium is greater than a predetermined value, a throttling feature, i.e., a gap, is formed between the pilot spool 61 and the pilot valve seat 62. At a low current, at the instant at which the main valve 7 opens, a pilot valve unloading passage (indicated by the arrow in Fig. 2) is provided, thereby avoiding pressure overshoot. When the current is further increased, the elastic member 4 and the spring 63 act together to regulate the size of the gap, thereby achieving pressure regulation.

[0031] When the coil 1 is energized, one axial side (upper side) of the elastic member 4 abuts against the axial end surface of the armature 2, and the other axial side (lower side) of the elastic member 4 abuts against the axial end surface of the magnetic pole 3. The axial end surfaces of the armature 2 and the magnetic pole 3 are flat surfaces.

[0032] When the coil 1 is de-energized, the elastic member 4 abuts against one of the armature 2 and the magnetic pole 3, and is separated from the other of the armature 2 and the magnetic pole 3. Specifically, as shown in Fig. 3, when de-energized, the elastic member 4 is in contact with the magnetic pole 3, and is separated from the armature 2. In this case, the push rod 5 is axially movably inserted through the elastic member 4. The elastic member 4 can be fixedly connected to the one of the armature 2 and the magnetic pole 3 with which it is in contact, for example, by welding.

[0033] The elastic member 4 can be a diaphragm spring. It should be understood that the elastic member 4 is not limited thereto, and other types of members capable of providing an elastic force, such as a wave spring, etc., can be used. Preferably, the elastic member 4 is a high-stiffness spring. When the coil 1 is energized, the peripheral edge of the diaphragm spring abuts against one of the armature 2 and the magnetic pole 3, and the protrusion at the center of the diaphragm spring abuts against the other of the armature 2 and the magnetic pole 3. Specifically, as shown in Fig. 2, when the coil 1 is energized, the peripheral edge of the diaphragm spring abuts against the armature 2, and the protrusion of the diaphragm spring abuts against the magnetic pole 3. The size of the diaphragm spring is substantially the same as the size of the axial end surface of the armature 2 or the magnetic pole 3.

[0034] In another embodiment, the solenoid valve includes a push rod elastic member (not shown), which can be used alone or together with the elastic member 4 of the above-described embodiment. The principle thereof is the same as that of the elastic member 4 of the above-described embodiment, and the purpose of reducing or even avoiding low-speed pressure overshoot can be achieved.

[0035] The push rod elastic member is provided on one side of the magnetic pole 3 in the first axial direction XI. When the coil 1 is energized, the push rod 5 pushes the pilot spool 61 against the pilot valve seat 62 against the elastic force of the push rod elastic member. The push rod 5 includes a shoulder surface against which the push rod elastic member is able to abut when the coil 1 is energized. The shoulder surface is adjacent to the end of the push rod 5 in the first axial direction XI.

[0036] The electromagnetic valve further comprises a pilot valve sleeve 64, the pilot valve spool 61 is sleeved in the pilot valve sleeve 64, and the push rod elastic member is clamped between the magnetic pole 3 and the pilot valve sleeve 64 in the axial direction. The push rod elastic member 4 can be a diaphragm spring. It should be understood that the push rod elastic member is not limited to this, and other types of components capable of providing elasticity can be used.

[0037] The electromagnetic valve further comprises a yoke sleeve 8, the armature 2 is sleeved in the yoke sleeve 8 and can move back and forth in the yoke sleeve 8 in the axial direction.

[0038] The embodiment of the present application also provides a shock absorber, and the electromagnetic valve of the above-mentioned embodiment can be applied to the shock absorber. The shock absorber comprises a cylinder body and a piston assembly. The piston assembly is fixed to one end of a piston rod. The piston assembly is arranged in the cylinder body and can move axially in the cylinder body. The piston assembly divides the cylinder body into a compression chamber and a rebound chamber, and the two chambers are filled with a fluid medium, which can be a gaseous medium or a liquid medium such as hydraulic oil. The shock absorber has a compression stroke and a rebound stroke. In the compression stroke, the fluid medium in the rebound chamber flows to the second working chamber through the piston assembly. In the rebound stroke, the fluid medium of the compression chamber flows to the first working chamber through the piston assembly. The electromagnetic valve can communicate with the rebound chamber to regulate the damping force of the fluid medium.

[0039] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0040] List of reference signs

[0041] 1, coil;

[0042] 2, armature;

[0043] 3, magnetic pole;

[0044] 4, elastic member;

[0045] 5, push rod;

[0046] 6, pilot valve; 61, 61', pilot valve spool; 62, 62', pilot valve seat; 63, spring; 64, pilot valve sleeve;

[0047] 7, main valve; 71, main valve spool; 72, main valve seat;

[0048] X1, first axial direction; X2, second axial direction;

[0049] 8, yoke sleeve.

Claims

1. A solenoid valve, comprising: a coil (1) capable of generating a magnetic field when excited by an electric current; an armature (2), at least a portion of which is circumferentially surrounded by the coil (1) and is capable of moving along a first axial direction (X1) under the action of the magnetic field; a magnetic pole (3) located on one side of the armature (2) in the first axial direction (X1); an elastic member (4) axially arranged between the armature (2) and the magnetic pole (3); a push rod (5) connected to the armature (2) in a relatively non-movable manner and passing through the magnetic pole (3) in an axially relatively movable manner; and A pilot valve (6) includes a pilot valve seat (62) and a pilot valve core (61), wherein: When the coil (1) is energized, the armature (2) moves along the first axial direction (X1) against the elastic force of the elastic member (4) under the action of the magnetic field, and the push rod (5) pushes the pilot valve core (61) against the pilot valve seat (62) under the drive of the armature (2), so that the pilot valve (6) is closed.

2. The solenoid valve according to claim 1, wherein: When the coil (1) loses power, the elastic member (4) abuts against one of the armature (2) and the magnetic pole (3), and the elastic member (4) is out of contact with the other of the armature (2) and the magnetic pole (3).

3. The solenoid valve according to claim 2, wherein: The elastic member (4) is fixedly connected to one of the armature (2) and the magnetic pole (3) that is in contact with each other.

4. The solenoid valve according to any one of claims 1 to 3, wherein: The elastic member (4) is a diaphragm spring.

5. The solenoid valve according to claim 4, wherein: When the coil (1) is energized, one axial side of the elastic member (4) abuts against the axial end face of the armature (2), and the other axial side of the elastic member (4) abuts against the axial end face of the magnetic pole (3).

6. A shock absorber, characterized in that: The invention comprises a solenoid valve according to any one of claims 1 to 5.

Images