KR100721377B1 - Solenoid valve for brake system - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve for a brake system. In particular, the flow path is opened and closed in two stages so that the valve can be easily opened and closed even in a state where a large braking pressure is applied.

The solenoid valve of the present invention for this purpose is provided with an inlet (31a) and the outlet (31b) therein is provided with a hollow valve housing 31 is formed stepped up and down, and the flow path of the valve housing 31 while moving up and down An amateur 34 provided with a plunger 34a and an opening / closing ball 34b to open and close is provided.

Then, the spool 41 in which the first orifice 41a is formed is guided through the inner surface of the upper step part 31d of the valve housing 31. The upper end of the spool 41 passes through the protrusion 41c and the fluid. The valve seat in which the groove part 41b is formed in the hollow part 31c of the valve housing 31 which adjoins the lower end of the spool 41, and the 2nd orifice 37a is provided is provided. The spool restoring spring 42 is provided between the protrusion 41c and the valve seat 37.

The operation of opening the valve is that the first orifice 41a is first opened as the armature 34 retreats, and the fluid introduced into the inlet 31a passes through the groove 41b of the spool 41 so that the first orifice 41a is opened. And finally flow toward the outlet 31b, and then the fluid flowing through the first orifice 41a of the spool 41 flows toward the predetermined amount of the outlet 31b so that the inlet 31a side and the outlet 31b side When the pressure difference decreases, the spool 41 is secondarily raised by the elasticity of the spool restoring spring 42, and the lower end of the spool 41 is separated from the valve seat 37 to the outlet 31b through the second orifice 37b. Will flow.

Therefore, as the flow path is greatly expanded, the fluid flows smoothly, and thus the pressure increase in the hydraulic line toward the outlet 31b is possible.

Description

Solenoid Valve for Brake System {SOLENOID VALVE FOR BRAKE SYSTEM}

1 is a cross-sectional view showing the configuration of a conventional solenoid valve.

2 is a cross-sectional view showing the configuration of a solenoid valve according to the present invention.

3 is a cross-sectional view showing in detail a closed state of the solenoid valve according to the present invention.

Figure 4 is a cross-sectional view showing an embodiment of the 'A-A' portion of the solenoid valve according to the present invention.

5 and 6 are cross-sectional views showing in detail the sequential opening operation of the solenoid valve flow path according to the present invention.

Explanation of symbols on the main parts of the drawings

20: modulator block, 21: valve coupling hole,

31: valve housing, 31a: inlet,

31b: outlet, 31c: hollow,

31d: upper stepped part, 31e: lower stepped part,

32: sleeve, 33: valve core,

34: amateur, 34a: plunger,

34b: opening and closing, 35: female coil,                 

36: restoring spring, 37: valve seat,

37a: second orifice, 41: spool,

41a: first orifice, 41b: groove,

41c: protrusion, 41d: support,

42: spool restoring spring,

The present invention relates to a solenoid valve for a brake system, and more particularly, a solenoid for a brake system in which a flow path is opened and closed in two stages so that the valve can be easily opened and closed even when a large braking pressure is applied, and the opening degree of the flow path can be increased. It is about a valve.

In general, an anti-lock brake system for a vehicle is installed in the middle of a brake hydraulic line to control and control the braking pressure applied to the wheel side, and includes a plurality of solenoid valves that open and close the flow path according to a control signal. .

As shown in FIG. 1, the solenoid valve for the brake system is press-fitted into the valve coupling hole 14 of the modulator block 13 and has a hollow having an inlet 3 and an outlet 4 for the flow of fluid. Valve housing (1).

At one end of the valve housing 1 a cylindrical sleeve 6 is engaged so that the armature 5 installed therein can be retracted, and an open end of the sleeve 6 is closed at the open end of the sleeve 6. At the same time, the valve core 7 for advancing and retracting the armature 5 is engaged. In addition, the armature (5) is a valve seat provided in the hollow portion (2) of the valve housing (1) is provided with a plunger (5a) integrally provided at one end thereof to open and close the orifice (8a) of the valve seat (8) through a forward and backward movement ( 8) side.

Between the armature 5 and the valve core 7 is provided a restoring spring 9 for imparting elastic restoring force to the armature 5 so that the armature 5 keeps the orifice 8a normally closed. 6) and an excitation coil 10 for advancing and retracting the armature 5 on the outside of the valve core 7.

The solenoid valve having such a configuration generates a magnetic force between the valve core 7 and the armature 5 when power is applied to the excitation coil 10, and the armature 5 moves toward the valve core 7 by this magnetic force. Open the orifice 8a of the valve seat 8. And when the power is not applied to the excitation coil 10, the magnetic force is released, the orifice (8a) is closed as the armature (5) is returned to its original state by the elasticity of the restoring spring (9).

However, in the conventional solenoid valve having such a configuration, when the pressure on the inlet 3 side is large when the plunger 5a of the armature 5 closes the orifice 8a, the initial operation of the armature 5 is prevented by this pressure. Since it is not smooth, there is a drawback that a large magnetic force is required to open the orifice 8a by operating the amateur 5.

In addition, in order to obtain a rapid increase in pressure through the opening and closing operation of the solenoid valve in a conventional brake system, the cross-sectional area (opening degree of the flow path) of the orifice 8a must be increased to increase the flow rate of the orifice 8a. The larger the cross-sectional area, the larger the force required to open the valve due to the pressure on the inlet 3 side, which has a drawback that the opening and closing operation of the valve becomes unstable. Therefore, in the related art, a large force (magnetic force) is applied to the armature 5 to smoothly open and close the valve, but in this case, the volume of the excitation coil 10 is increased to generate a large magnetic force as well as a large operation noise of the valve. There was a problem that had to grow.

The present invention is to solve such problems, an object of the present invention is to open and close the valve in two stages in order to easily open and close with a small force even when a large braking pressure is applied to the inlet of the valve, It is to provide a solenoid valve for a brake system to increase the opening degree to enable a rapid pressure rise in the hydraulic line.

A solenoid valve for a brake system according to the present invention for achieving the above object is, a hollow valve housing is formed around the inlet of the fluid and one end thereof constitutes the outlet of the fluid, and one end of the hollow sleeve is coupled to the valve housing A magnetic valve core coupled to the other end of the sleeve; an arm having a plunger portion removably installed in the sleeve and extending a predetermined length into the valve housing; and installed outside the valve core and the sleeve to advance and retract the amateur. In a solenoid valve for a brake system comprising an excitation coil,                     

A spool having an upper end guided by the valve housing inner surface so as to be installed in the valve housing in a retractable manner, and having a first orifice having a predetermined diameter penetrating in the longitudinal direction at a central portion thereof;

The outer circumferential surface of one side of the spool and the protrusion extending in a radial direction a predetermined length,

A valve seat in which a second orifice larger than an inner diameter of the first orifice is formed at the center so that the outlet opening is opened and closed separately from the first orifice while being in contact with or spaced apart from the lower end of the spool when the spool is advanced;

And a spool restoring spring for urging the spool toward the plunger.

In addition, the valve housing is formed to be stepped into the upper and lower portions and has an upper step portion and a lower step portion having a larger inner diameter than the upper step portion,

The upper end of the spool is advanced in the upper step of the valve housing,

The projection of the spool is characterized by advancing in the lower step of the valve housing.

In addition, the outer surface of the upper end of the spool is characterized in that the support portion which is in contact with the valve housing and the groove portion through which the fluid passes.

In addition, the interval (h) between the lower end of the upper step portion and the protrusion when the power is not applied to the excitation coil is characterized in that it is provided larger than the stroke interval (s) of the amateur.

In addition, the spool restoring spring is characterized in that it is arranged to surround the spool between the projection and the valve seat.

In addition, the groove portion is characterized in that formed at substantially 120 ° intervals in three places on the outer surface of the spool.

In addition, the groove portion is characterized in that it is provided to be symmetrical on both sides of the outer surface of the spool.

In addition, the groove is characterized in that the cross section of the spool is provided on the outer surface to form an equilateral triangle.

Hereinafter, with reference to the accompanying drawings a preferred embodiment according to the present invention will be described in detail.

As shown in FIG. 2, the solenoid valve for the brake system according to the present invention is press-fitted into the valve coupling hole 21 of the modulator block 20 in which a plurality of flow paths 20a and 20b are formed, and the inlet port ( 31a and outlet 31b are provided with a hollow valve housing 31 in communication with flow paths 20a and 20b in modulator block 20, respectively.

In addition, the hollow portion 31c of the valve housing 31 is formed to be stepped up and down to have an upper stepped portion 31d and a lower stepped portion 31e, and the lower stepped portion 31e has an upper stepped portion 31d. Compared to the inside diameter of the upper step portion 31d, the spool 41 to be described later is guided through the inner surface of the upper stepped portion 31d.

A hollow sleeve 32 having a cylindrical shape is coupled to the outer surface of the valve housing 31, and a magnetic valve core 33 is coupled to an open end of the sleeve 32 extending outwardly of the valve coupling hole 21. do. That is, the sleeve 32 is closed by coupling the valve core 33 to the upper portion. In addition, a cylindrical armature 34 capable of moving up and down is provided in the sleeve 32 so as to open and close the flow path of the valve housing 31. At this time, the armature 34 is slidably supported on the inner surface of the sleeve 32, the lower portion is made of a plunger 34a smaller than the diameter of the upper portion extends into the hollow portion 31c of the valve housing 31. And the opening and closing ball 34b for opening and closing the flow path is coupled to the lower end of the plunger 34a.

On the outside of the sleeve 32 and the valve core 33, an excitation coil 35 for advancing and retracting the armature 34 in the sleeve 32 is provided. The upper portion of the armature 34 in the sleeve 32 and the valve core are provided. Between 33, a restoring spring 36 is provided to elastically support the armature 34 so as to push the armature 34 toward the valve housing 31 when no power is applied to the excitation coil 35. In the hollow portion 31c of the valve housing 31 into which the plunger 34a of the armature 34 enters, a spool 41 which retreats in the hollow portion 31c so that the flow path of the valve is sequentially opened and closed in two stages is provided. Is installed.

As shown in FIGS. 3 and 4, the spool 41 is installed in the hollow portion 31c of the valve housing 31 so as to be retractable and has a cylindrical shape in which the center penetrates in the vertical direction to allow the flow of fluid. Prepared.

This spool 41 is formed to have a substantially similar outer diameter to the plunger portion 34a of the amateur 34 and the central orifice 41a penetrates up and down, so that the upper end of the orifice 41a is the plunger portion of the amateur 34. It is configured to open and close contact with the opening and closing ball 34b coupled to (34a).

In addition, the outer surface of the upper end of the spool 41 is in contact with the valve housing 31 to move up and down, and the groove 41b is formed so that the fluid introduced into the inlet 31a passes and flows to the upper end of the orifice 41a. .

As shown in FIG. 4, the cross section of the groove part 41b is provided by side cutting or clearance such that the support part 41d and the groove part 41b are formed on the outer surface of the spool 41 so as to be in contact with the valve housing 31. 4 (a) discloses a groove part 41b having three outer surfaces of the spool 41 cut at intervals of 120 °, and in FIG. 4 (b), both sides of the outer surface of the spool 41 are symmetrical. The cut portion provided with the groove 41b 'is disclosed, and Fig. 4 (c) discloses the cut portion 41b' 'having its outer surface cut to form an equilateral triangle.

In addition, the outer circumferential surface of the spool 41 is formed with a projection 41c extending in a predetermined length in the radial direction so as to be supported by the spool restoring spring 42 to be described later, the projection 41c is a valve when the spool 41 is advanced The inside of the lower step portion 31e of the housing 31 moves forward and backward.

In addition, the interval (s) between the lower end of the protrusion 41c and the upper stepped portion 31e at the initial position when power is not applied to the excitation coil 35 is formed to be larger than the stroke interval h of the armature 36. This structure is intended to prevent the movement of the spool 41 by preventing the protrusion 41c of the spool 41 from being caught by the lower end of the upper step portion 31d. (h> s)

In addition, in the hollow portion 31c of the valve housing 31 close to the lower end of the spool 41, the first orifice 41a described above is contacted or spaced apart from the lower end of the spool 41 when the spool 41 is advanced. Apart from the valve seat 37 is provided to open and close the outlet 31b. The valve seat 37 has a second orifice 37a formed in the center thereof with a diameter larger in diameter than the first orifice 41a.

The spool restoring spring 42 is composed of a conventional coiled compression spring, which is inserted into the lower end of the spool 41, the upper end of which is supported by the protrusion 41c of the spool 41 and the lower end of the valve. The upper surface of the sheet 37 is supported.

The elasticity of the spool restoring spring 42 described above is smaller than the elasticity of the restoring spring 36 that pushes the armature 34. This is because the first orifice 41a and the second orifice 37a are closed while the plunger 34a and the spool 41 are lowered by the elasticity of the restoring spring 36 when power is not applied to the excitation coil 35. I would have to.

The following describes the opening and closing operation of the solenoid valve for a brake system according to the present invention of such a configuration.

When power is not applied to the excitation coil 35, as shown in FIG. 4, the restoring spring 36 overcomes the elasticity of the spool restoring spring 42 and pushes the armature 34 toward the spool 41. The first orifice 41a is closed through the opening / closing ball 34b at the bottom of the plunger 34a, and the second orifice 37b is maintained closed through the lower end of the spool 41.

When power is applied to the excitation coil 35 in this state, the armature 34 is moved toward the valve core 33 by the magnetic force generated between the armature 34 and the valve core 33 to open the flow path of the valve. At this time, since a high braking pressure is applied to the inlet 31a of the valve housing 31, the pressure acting on the spool 41 is also large, so that the plunger 34a is raised from the spool 41 as shown in FIG. The first opening and closing ball 34b is spaced apart from the first orifice 41a. That is, the first orifice 41a is first opened, and the fluid introduced into the inlet 31a flows through the groove 41b of the spool 41 to the first orifice 41a and finally flows toward the outlet 31b.

When the fluid flowing through the first orifice 41a of the spool 41 flows toward the predetermined amount of the outlet 31b and the pressure difference between the inlet 31a side and the outlet 31b side decreases, Fig. 6 Spool restoring spring 42 The lower end of the spool 41 is spaced apart from the valve seat 37 as the spool 41 is secondly raised by the elasticity. That is, at this time, the fluid introduced into the inlet 31a flows toward the outlet 31b through the second orifice 37b having a larger diameter, so that the flow path is greatly expanded and the fluid flows smoothly, so that the pressure of the hydraulic line toward the outlet 31b is increased. Ascension becomes possible.

As such, the present invention opens the valve flow path through the two-stage operation of the armature 34 and the spool 41, so that a small force exists even in a situation where a large pressure difference exists between the inlet 31a and the outlet 31b. Since the valve can be opened, the volume of the excitation coil 35 can be reduced, and since the flow path is greatly enlarged through the second orifice 37b, the pressure rise of the hydraulic line toward the outlet 31b is possible.

As described in detail above, in the solenoid valve for the brake system according to the present invention, since the valve is opened and closed in two stages through a spool installed at the lower portion of the armature, the valve is operated with a small force even when a large braking pressure is applied to the inlet side. There is an effect made easy to open and close.

In addition, the present invention has the effect of reducing the volume of the excitation coil for the operation of the amateur since the valve can be opened and closed with a small force.

In addition, the present invention has the effect that the fluid flows into the inlet through the upward movement of the spool flows directly to the outlet through the second orifice having a large diameter to enable a rapid pressure rise of the hydraulic line on the outlet side.

Claims (8)

The inlet of the fluid is formed in the circumference and one end thereof forms an outlet of the fluid, and is formed to be stepped up and down to have an upper stepped portion and a lower stepped portion having a larger inner diameter than the upper stepped portion. An amateur having a hollow valve housing, a hollow sleeve having one end coupled to the valve housing, a magnetic valve core coupled to the other end of the sleeve, and a plunger portion provided with the sleeve retractable and extending a predetermined length into the valve housing. In the solenoid valve for a brake system comprising an excitation coil provided on the outside of the sleeve and the valve core to advance and retract the amateur, A spool having an upper end guided by the valve housing inner surface so as to be installed in the valve housing in a retractable manner, and having a first orifice having a predetermined diameter penetrating in the longitudinal direction at a central portion thereof; A valve seat having a protrusion formed therein and a second orifice larger than an inner diameter of the first orifice so as to be in contact with a lower end of the spool when the spool is advanced or spaced apart from the first orifice so as to be opened and closed separately from the first orifice. Wow, And a spool restoring spring for urging said spool toward said plunger, wherein an upper end of said spool retreats within an upper step portion of said valve housing, and a protrusion of said spool retreats into a lower step portion of said valve housing, said excitation coil When the power is not applied to the solenoid valve for the brake system, characterized in that the gap (h) of the lower end of the upper stepped portion and the protrusion is provided larger than the stroke interval (s) of the amateur. delete The method of claim 1, The outer surface of the upper end of the spool is a solenoid valve for a brake system, characterized in that the support portion which is in contact with the valve housing and the groove portion through which the fluid passes. delete The method of claim 1, The spool restoring spring is a solenoid valve for a brake system, characterized in that disposed between the protrusion and the valve seat to wrap the spool. The method of claim 3, wherein The groove portion is a solenoid valve for a brake system, characterized in that formed in three places on the outer surface of the spool substantially 120 ° intervals. The method of claim 3, wherein The groove part is a solenoid valve for a brake system, characterized in that the groove is provided symmetrically on both sides of the outer surface. The method of claim 3, wherein The groove portion is a solenoid valve for a brake system, characterized in that provided on the outer surface so that the cross section of the spool has an equilateral triangle.

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