KR20170058583A - Solenoid valve for brake system - Google Patents

Abstract

The present invention provides a solenoid valve for a brake system. According to an aspect of the present invention, the solenoid valve for a brake system comprises: a cylindrical valve housing installed in a bore of a modulator block and having an oil passage allowing connection between the inside and the outside; a sleeve having a hollow part having a hollow interior and coupled while surrounding the exterior surface of the upper side of the valve housing; a magnet core sealing the upper part of the sleeve; a valve seat installed inside the valve housing and having an orifice formed therein; an armature installed inside the sleeve to be reciprocally moved and opening and closing the orifice; and a restoration spring compressing the armature toward the orifice. A spring seating groove receiving the restoring spring is formed on an upper part of the armature, and at least one vent hole is formed to pass through the armature to allow the spring seating groove and the oil passage to communicate. The solenoid valve for a brake system smoothly discharges inner air thereof to prevent vibration and noise when performing an operation.

Description

[0001] The present invention relates to a solenoid valve for a brake system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve for a brake system, and more particularly, to a solenoid valve for a brake system improved to easily discharge air in a solenoid valve so as to improve control performance of the solenoid valve.

Generally, the brake system is a device that performs stable braking operation by transmitting the hydraulic pressure generated from the master cylinder to the wheel cylinders of each wheel by the operation of the brake pedal. In order to control the braking pressure of the brake system, a plurality of solenoid valves, pumps, motors, and the like are installed in a modulator block having hydraulic lines.

The solenoid valve for opening and closing the hydraulic line of the hydraulic line includes a normally open type solenoid valve that maintains the normally open state and a normally closed type normally closed The NC type solenoid valve is disclosed in Korean Patent Laid-Open No. 10-2010-0003784.

Referring to the published literature, an NC-type solenoid valve is installed in a bore of a modulator block in which flow paths are formed, and has a hollow valve housing having an inlet and an outlet communicating with an inflow passage and an outflow passage of the modulator block, A valve seat provided in the valve housing and having an orifice formed therein, a sleeve provided on the valve housing to allow the armature to move forward and backward, a magnet core and an armature for closing the open portion of the sleeve and advancing the armature, And has a restoring spring for urging it toward the orifice. At this time, the restoring spring is installed in the spring seating groove formed at the upper end of the armature so as to press the armature toward the valve seat to close the orifice to close the oil passage.

In order to improve the smooth operation and performance of the NC type solenoid valve and to reduce the noise during operation, a liquid injection device is installed so that air does not remain in the solenoid valve during the installation of the solenoid valve so that air bleeding and brake oil Execute the injection operation. At this time, a 'v' -shaped slot is formed on the outer surface of the armature in the longitudinal direction for the air bleeding operation and the liquid injection operation in the solenoid valve.

However, since the structure in which the spring seating groove is provided on the upper portion of the armature is difficult to discharge air in the spring seating groove, the 'v' shaped slot formed on the outer surface of the armature causes the problem of centering failure of the armature You can. Accordingly, when air is left in the solenoid valve or the centering of the armature is shifted, vibration and noise are generated when the solenoid valve is driven.

Further, since the ON / OFF operation of the solenoid valve must be repeated for discharging the air during the liquid injecting process, the liquid injection process is complicated and the discharge passage is blocked when the solenoid valve is turned off (orifice blocking) do.

Korean Patent Publication No. 10-2010-0003784 (Mando Co., Ltd.) 2010. 01. 12.

The solenoid valve for a brake system according to an embodiment of the present invention smoothly discharges the air inside the valve, thereby preventing vibration and noise during operation.

According to an aspect of the present invention, there is provided a compressor comprising: a cylindrical valve housing installed in a bore of a modulator block and having an oil passage communicating between the inside and the outside; A sleeve having a hollow hollow portion formed therein and surrounding the upper outer surface of the valve housing; A magnet core sealing the upper portion of the sleeve; A valve seat installed in the valve housing and having an orifice formed therein; An armature movably installed in the sleeve to open and close the orifice; And a restoration spring for pressing the armature toward the orifice, wherein a spring seat groove is formed in the upper portion of the armature to receive the restoration spring, and the spring seat groove and the oil passage are communicated with each other through the armature A solenoid valve for a brake system in which at least one vent hole is formed may be provided.

The vent hole may include a first hole formed in the center of the armature in a longitudinal direction with respect to a bottom surface of the spring seat, and a second hole communicating with the first hole.

The armature disposed in the sleeve may be formed to have an outer diameter equal to the inner diameter of the sleeve so as to be guided over the entire surface in the sleeve.

The solenoid valve for a brake system according to an embodiment of the present invention includes a vent hole for communicating with the spring seat groove in the armature so as to easily discharge the air between the spring seat groove and the armature core and the magnet core, It is possible to prevent noise and vibration that may occur during operation of the solenoid valve. Accordingly, the operation of the solenoid valve can be stably performed.

Also, by eliminating the 'v' shaped slot formed on the outer surface of the existing armature, it is possible to solve the centering defective problem of the armature in the operation of the solenoid valve.

In addition, even when the solenoid valve is maintained in the on-state (orifice open) state during the liquid injecting process, the air can be discharged easily, so that the injection procedure of the brake oil to the solenoid valve can be simplified when the solenoid valve is mounted.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention will be described in detail with reference to the following drawings, which illustrate preferred embodiments of the present invention, and thus the technical idea of the present invention should not be construed as being limited thereto.
1 is a sectional view showing a solenoid valve for a brake system according to a preferred embodiment of the present invention.
2 is a sectional view taken along a line II-II 'in FIG.
3 is a cross-sectional view illustrating a state in which air is discharged in a state in which a solenoid valve for a brake system is operated according to a preferred embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are provided to fully convey the spirit of the present invention to a person having ordinary skill in the art to which the present invention belongs. The present invention is not limited to the embodiments shown herein but may be embodied in other forms. For the sake of clarity, the drawings are not drawn to scale, and the size of the elements may be slightly exaggerated to facilitate understanding.

FIG. 1 is a sectional view showing a solenoid valve for a brake system according to a preferred embodiment of the present invention, and FIG. 2 is a sectional view taken along a line II-II 'in FIG.

1 and 2, a solenoid valve 100 for a brake system according to an embodiment of the present invention includes a valve housing 110 inserted into a modulator block 10, a valve installed in the valve housing 110, A sleeve 130 coupled to the valve housing 110; a magnet core 140 coupled to the sleeve 130 opposite the valve housing 110; And a restoring spring 160 for urging the armature 150 and the armature 150 toward the valve seat 120. [

The valve housing 110 is formed with a through hole passing through the center in the longitudinal direction and a flange portion 115 for fixing the valve housing 110 to the inlet side of the bore 11 of the modular block 10 is provided on the outer surface . The flange portion 115 is fixed by deformation of the modulator block 10 when the solenoid valve 100 is installed.

On the other hand, the valve housing 110 is provided with oil passages 112 and 113 communicating with the inside and the outside. The oil passages 112 and 113 are provided with an inlet port 112 and an outlet port 113 communicating with the inflow passage 12 and the outflow passage 13 formed in the modulator block 10 so as to allow the oil to flow in and out .

The valve seat 120 is press-fitted into the valve housing 110. The valve seat 120 is disposed between an inlet port 112 and an outlet port 113 and an orifice 122 is formed to communicate the inlet port 112 and the outlet port 113.

The sleeve 130 has a cylindrical shape in which the armature 150 installed in the hollow hollow 135 has a cylindrical shape, and the upper and lower portions thereof are opened. The open bottom of the sleeve 130 is press-fitted into the upper outer surface of the valve housing 110. The sleeve 130 may be fixed to the valve housing 110 by welding or the like.

The magnet core 140 is coupled to the open top of the sleeve 130 to close the open portion of the sleeve 130. The magnet core 140 generates an electromagnetic force to move the armature 150 forward and backward. In order to generate the electromagnetic force, an excitation coil assembly (not shown) is installed outside the magnet core 140 and the sleeve 130 to generate a magnetic field by application of power. Accordingly, when power is applied to the excitation coil assembly, the armature 150 moves toward the magnet core 140. [

The armature 150 moves back and forth in the sleeve 130 and opens or closes the orifice 122 of the valve seat 120. More specifically, the armature 150 is provided with an opening / closing part 152 of a spherical shape that is formed so as to extend in the valve housing 110 so that the lower part thereof is located within the valve housing 110 and opens or closes the orifice 122 of the valve seat 120, A spring seating groove 156 in which a spring 160 is installed is provided. One end of the restoring spring 160 is supported by the magnet core 140 and the other end is supported by the spring seating groove 156. The armature 150 is biased toward the valve seat 120 by the restoring spring 160 And is pressurized. Thus, when power is turned off to the excitation coil assembly, the armature 150 returns to its original position and closes the orifice 122 of the valve seat 120.

According to one aspect of the present invention, the armature 150 includes at least one vent (not shown) for smoothly discharging air between the spring seating groove 156 and the magnet core 140 and the armature 150 when the solenoid valve 100 is installed, Holes 153 and 154 are formed. That is, the vent holes 153 and 154 are formed so that the spring seat 156 and the oil passages 112 and 113 communicate with each other. More specifically, the vent holes 153 and 154 include a first hole 153 formed in the center of the armature 150 in the longitudinal direction with respect to the bottom surface of the spring seating groove 156, As shown in FIG. At this time, the first hole 153 is formed with reference to the bottom surface of the spring seating groove 156 in order to smoothly discharge air from the spring seating groove 156. The second hole 154 is formed to communicate with the first hole 153 and the inside of the valve housing 110. The second hole 154 is formed to be perpendicular to the first hole 153 in the horizontal direction. However, the second hole 154 is not limited thereto, and if the air in the spring seating groove 156 can be easily discharged, It is obvious that the number, shape and angle of the two holes 154 can be changed and used.

Also, although the vent holes are shown as the first and second holes 153 and 154, they may be formed as one hole to smoothly discharge the air in the solenoid valve 100.

A state in which the air in the solenoid valve is easily discharged when the solenoid valve is installed will now be described with reference to FIG.

3, when the solenoid valve 100 is energized by an excitation coil assembly (not shown), the armature 150 presses the restoration spring 160 and moves toward the magnet core 140. That is, 122 are open. The spring seating groove 156 is provided in communication with the oil passages 112 and 113 of the valve housing 110, that is, the inside and the outside of the valve through the vent holes 153 and 154. In this state, air inside the valve can be easily discharged through a liquid injecting device (not shown), and liquid injection fixing can be facilitated.

As described above, the solenoid valve 100 for a brake system according to one aspect of the present invention includes a spring seat 156 and vent holes 153 and 154 formed to communicate with each other in the valve housing 110 So that the air in the valve can be easily discharged when the solenoid valve 100 is installed. As a result, since no air remains in the solenoid valve 100, vibration and noise are not generated during operation, so that the performance of the solenoid valve 100 can be improved, and the procedure for injecting brake oil can be simplified It is effective.

According to one aspect of the present invention, the armature 150 disposed in the sleeve 130 has the same diameter as the hollow portion 135, which is the inner diameter of the sleeve 130, so as to be guided over the entire surface in the sleeve 130 Respectively. This eliminates the problem of centering failure of the armature 150 when the solenoid valve 100 is operated.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be understood that various modifications and changes may be made without departing from the scope of the appended claims.

100: Solenoid valve 110: Valve housing
120: valve seat 130: sleeve
140: Magnet core 150: armature
153, 154: vent hole 156: spring seat groove
160: Restore spring

Claims (3)

A cylindrical valve housing installed in a bore of the modulator block and having an oil passage communicating between the inside and the outside;
A sleeve having a hollow hollow portion formed therein and surrounding the upper outer surface of the valve housing;
A magnet core sealing the upper portion of the sleeve;
A valve seat installed in the valve housing and having an orifice formed therein;
An armature movably installed in the sleeve to open and close the orifice; And
And a restoration spring for urging the armature toward the orifice,
A solenoid valve for a brake system in which at least one vent hole passing through the armature is formed so that the spring seating groove and the oil passage communicate with each other. The method according to claim 1,
Wherein the vent hole is provided with a first hole formed in a longitudinal direction at a center of the armature with respect to a bottom surface of the spring seat, and a second hole communicating with the first hole. The method according to claim 1,
Wherein the armature disposed in the sleeve is formed to have an outer diameter equal to the inner diameter of the sleeve so as to be guided over the entire surface in the sleeve.

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