KR101608771B1 - Solenoid valve for brake system - Google Patents

Abstract

A solenoid valve for a brake system is disclosed. According to an embodiment of the present invention, there is provided a brake system solenoid installed in a modulator block having a first bore communicating with an inflow passage and a second bore communicating with the discharge passage, the brake system controlling oil flow between the inflow passage and the discharge passage A valve comprising: a valve seat having a first orifice press-fitted into said second bore; A sleeve having a cylindrical shape with an upper portion and a lower portion opened and provided with a flange portion whose lower end is bent outwardly to be fixed to the modulator block; A valve core coupled to seal the open top of the sleeve; An opening and closing member provided in the first bore so as to move up and down and having an inner flow path formed therein and a first opening and closing part for opening and closing the first orifice on the lower side and a second orifice on the upper side formed smaller than the first orifice; An armature movably installed in the sleeve and having a second opening and closing part for opening and closing a second orifice at a lower end thereof; A restoring spring for urging the armature toward the second orifice; And an opening spring for moving the opening and closing member toward the armature for opening the first orifice.

Description

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

The present invention relates to a solenoid valve for a brake system, and more particularly, to a solenoid valve for an improved brake system that is simplified in structure and can be easily manufactured and reduced in manufacturing cost.

BACKGROUND ART [0002] Generally, an electronically controlled brake system effectively prevents a slip phenomenon of a wheel that can occur when a vehicle is braked, suddenly accelerated, or rapidly accelerated, and includes a plurality of solenoid valves for controlling braking hydraulic pressure transmitted from a master cylinder to a wheel cylinder side An accumulator for temporarily storing the oil that has escaped from the wheel cylinder, a pump for recovering the oil from the wheel cylinder to the master cylinder side, and an electronic control unit (ECU) for controlling the driving of the solenoid valve and the pump . The solenoid valve, the accumulator, and the pump are installed in a modulator block having a flow path forming a hydraulic circuit to control the braking hydraulic pressure. Figure 1 schematically shows a conventional solenoid valve.

The conventional solenoid valve 10 is inserted into the bore 2 of the modulator block 1 and is connected to an inlet port 3 and an outlet port 4 of the modulator block 1, A hollow seat support member 20 having a seat 23 and an outlet 24, a sleeve 30 disposed at the top of the seat support member 20 and fixed to the modulator block 1, A valve seat member 40 having a first orifice 41 and a connecting member 50 connecting the sleeve 30 and the seat support member 20 and a seat support member 20, A valve core 60 welded to the sleeve 30 on the opposite side by welding; an armature 70 provided movably in the sleeve 30 so as to be movable forward and backward; (80) having a second orifice (81) smaller than the first orifice (41) and having an opening / closing part (84) for opening / closing the first orifice (41) And an excitation coil assembly (not shown) installed outside the sleeve 30 to generate magnetic force to move the armature 70 forward and backward. A restoring spring 91 for urging the armature 70 downward is provided between the valve core 60 and the armature 70 and a direction in which the first orifice 41 is opened is formed on the outside of the opening and closing member 80 An opening spring 92 for moving the opening and closing member 80 is provided. At this time, a spring supporting portion 52 for supporting the opening spring 92 is provided at the lower end of the connecting member 50, and a spring supporting protrusion 82 formed to have a step is provided on the opening / closing member 80 The opening spring 92 is stably installed.

When the armature 70 is moved toward the valve core 60 by the magnetic force, the second orifice 81 having a relatively small size is opened first and the second orifice 81 is opened after the second orifice 81 is opened 81) When the pressure difference between the upstream and the downstream becomes small, the opening spring 92 pushes up the opening / closing member 80, so that the relatively large first orifice 41 is opened. Therefore, the solenoid valve 10 can easily open the flow path with a small force.

Since the conventional solenoid valve 10 as described above is configured such that the seat support member 20 and the valve seat member 40 are separately provided and the valve seat member 40 is press-fitted into the seat support member 20, There is a problem that it is difficult to manufacture due to a large number of structures and a complicated structure. This increases the manufacturing cost.

In particular, the seat support member 20 serves to provide a flow path in the valve and to support the valve to the modulator block, as well as to determine the suction performance of the oil flowing through the inflow path. That is, since the oil must be precisely machined so as to prevent the oil from leaking between the valve seat member 40 and the connecting member 50 which are engaged with the seat support member 20, the quality cost is increased, There is a problem that the size and position of the inlet port are restricted.

It is an object of the present invention to provide a solenoid valve for a brake system capable of minimizing cumulative tolerance by assembling and reducing manufacturing cost by simplifying the structure, The purpose is to provide.

According to an aspect of the present invention, there is provided an air conditioner comprising: a modulator block installed in a modulator block having a first bore communicating with an inflow passage and a second bore communicating with a discharge passage, A valve seat having a first orifice press-fitted into the second bore, the solenoid valve comprising: A sleeve having a cylindrical shape with an upper portion and a lower portion opened and provided with a flange portion whose lower end is bent outwardly to be fixed to the modulator block; A valve core coupled to seal the open top of the sleeve; An opening and closing member provided in the first bore so as to move up and down and having an inner flow path formed therein and a first opening and closing part for opening and closing the first orifice on the lower side and a second orifice on the upper side formed smaller than the first orifice; An armature movably installed in the sleeve and having a second opening and closing part for opening and closing a second orifice at a lower end thereof; A restoring spring for urging the armature toward the second orifice; And an opening spring for moving the opening and closing member toward the armature for opening the first orifice.

The support member may further include a cylindrical first support portion having the opening and closing member therein to guide the opening and closing member so that the opening and closing member can move up and down; A second support portion that is bent at an upper end of the first support portion to contact the lower surface of the flange portion; And a third support portion that extends inwardly from the lower end of the first support portion to support one end of the open spring, and an upper end of the open / close member is formed with a stepped spring support chin for supporting the other end of the open spring, Can be provided.

The second support portion may be fixed to the modulator block together with the flange portion.

The flange portion is provided with a coupling piece formed by bending the outer end of the flange portion downward so that oil in the valve is not leaked between the flange portion and the second support portion, and the second support portion is press- .

In addition, a filter member may be further provided on the outer side of the support member to filter foreign matter of oil flowing through the inflow channel.

The solenoid valve for a brake system according to the present invention can reduce the manufacturing cost and the suction performance by removing the seat support member, so that the solenoid valve is not affected by the size and position of the inlet port.

Further, since the valve seat is directly press-fitted into the modulator block, the cumulative tolerance during assembly is minimized, thereby reducing the quality cost.

In addition, by bending the end of the sleeve a plurality of times and fixing it to the modulator block, the oil in the valve can be prevented from leaking to the outside, and an effect that the oil can be provided to the assembly together with the support member engaged with the sleeve can be obtained.

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 conventional solenoid valve.
2 is a sectional view showing a solenoid valve for a brake system according to a preferred embodiment of the present invention;
FIG. 3 and FIG. 4 are views showing the operating state of a solenoid valve for a brake system according to a preferred embodiment of the present invention. FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a sectional view showing a solenoid valve for a brake system according to a preferred embodiment of the present invention.

2, a solenoid valve 100 for a brake system includes a valve seat 120 in which a first orifice 121 is formed, a cylindrical sleeve 130, a valve core 140 coupled to an upper portion of the sleeve 130, Respectively. And an excitation coil assembly (not shown) provided on the outside of the opening and closing member 150, the armature 160, and the sleeve 130 for opening and closing the flow path.

The solenoid valve 100 is installed in the modulator block 110 with a bore having an inflow passage 113 and a discharge passage 114. The solenoid valve 100 is installed in a bore to control the flow of oil Respectively. The bore formed in the modulator block 110 has a stepped shape composed of a first bore 111 communicating with the inflow passage 113 and a second bore 112 communicating with the discharge passage 114.

The valve seat 120 is press-fitted into the second bore 112, and a first orifice 121 is formed. A discharge passage 114 is provided at the lower end of the valve seat 120. The valve seat 120 is press-fitted into the second bore 112 to minimize the cumulative tolerance of assembling the valve, .

The sleeve 130 is provided in a cylindrical shape with open top and bottom. The lower end of the sleeve 130 is provided with a flange portion 132 bent outwardly to be fixed to the modulator block 110. The flange portion 132 is fixed to the modulator block 110 together with a support member 180 to be described later and is engaged with the support member 180 so that the outer end of the flange portion 132 is bent downward Piece 134 is provided. The engagement piece 134 will be described below.

Such a sleeve 130 can be easily manufactured by a normal deep drawing process.

The valve core 140 is press-fit into the upper end of the sleeve 130 to seal the open top of the sleeve 130. Although not shown, a coupling groove is formed in the valve core 140 for more tight coupling between the valve core 140 and the sleeve 130, and the sleeve 130 is press-fitted into the coupling groove to be fixed . In other words, this coupling structure facilitates the coupling of the sleeve 130 and the valve core 140 and simplifies the coupling process as compared with the conventional welding method.

The opening and closing member 150 is provided so as to be movable up and down in the first bore 111. According to the drawings, the opening and closing member 150 is guided by the support member 180 to be described later and is moved up and down. Here, the support member 180 will be described below again. The opening and closing member 150 is provided with an inner passage 153 through which oil can flow and a second orifice 152 communicating with the inner passage 153 and having a diameter smaller than that of the first orifice 121, Respectively. On the lower side, a first opening and closing part 151 capable of opening and closing the first orifice 121 is formed. That is, when the opening / closing member 150 moves back and forth, its lower outer surface is brought into close contact with the upper surface of the valve seat 120, thereby opening / closing the first orifice 121.

An opening spring 175 is provided on the outside of the opening and closing member 150 to move the opening and closing member 150 in a direction to open the first orifice 121. As shown in the figure, the lower end of the opening spring 175 is supported at the lower end of the support member 180, and the upper end of the opening spring 175 is supported by the opening / closing member 150 And is supported by a spring support step 155 formed to have a step on the upper side. Accordingly, the opening / closing member 150 can be moved in the direction of opening the first orifice 121 by the elasticity of the opening spring 175 to open the first orifice 121.

Reference numeral 154 denotes an oil passage having at least one slot shape formed on the outer surface of the opening / closing member 150 so that oil can flow up and down.

The armature 160 is vertically movably installed in the sleeve 130. The armature 160 has a cylindrical shape whose outer diameter corresponds to the inner diameter of the sleeve 130. At the lower end of the armature 160, a second opening and closing part 162 of a spherical shape capable of opening and closing the second orifice 152 is provided. That is, the second opening and closing portion 162 opens and closes the second orifice 152 by the advancing / retreating operation of the armature 160. [

A restoring spring 171 for urging the armature 160 toward the opening and closing member 150 is provided between the armature 160 and the valve core 140. The restoring spring 171 is accommodated in the spring receiving groove 161 formed on the upper portion of the armature 160. The restoring spring 171 received in the spring receiving groove 161 presses the armature 160 toward the opening and closing member 150 so that the second opening and closing portion 162 normally closes the second orifice 152 . The restoring spring 171 is made more elastic than the opening spring 175 so as to overcome the elastic force of the opening spring 175 and press the armature 160 and the opening and closing member 150. Thus, the first and second orifices 121 and 152 are closed by the first opening and closing part 151 and the second opening and closing part 162, respectively.

An excitation coil assembly (not shown) provided in a cylindrical shape on the outer side of the sleeve 130 is provided to move the armature 160 forward and backward. The excitation coil assembly includes a cylindrical coil case, a bobbin accommodated in the coil case, and an excitation coil wound on the outer surface of the bobbin. Such an excitation coil assembly is a well known technique. When a power is applied to the excitation coil of the excitation coil assembly, a magnetic field is formed to move the armature 160 toward the valve core 140 so as to move the second orifice 152 So that it can be opened.

Meanwhile, the solenoid valve 100 for a brake system according to an embodiment of the present invention further includes a support member 180. That is, the support member 180 serves to guide the opening and closing member 150 at the same time and to support the lower end of the opening spring 175, and the flange portion 132 of the sleeve 130, And is fixedly installed in the block 110.

More specifically, the support member 180 includes a cylindrical first support portion 181 having upper and lower openings and provided with an opening and closing member 150 to guide the opening and closing member 150 so as to be vertically movable, A second support portion 182 that is bent at an upper end of the support portion 181 to be in contact with a lower surface of the flange portion 132 and a lower end of the first support portion 181 is bent and extended inward, And a third support portion 183 for supporting one end.

The second support portion 182 is a portion fixed to the modulator block 110 together with the flange portion 132 and the upper surface of the second support portion 182 is in contact with the lower surface of the flange portion 132. At this time, the second support portion 182 can be press-fitted into the sleeve 130 by the engagement piece 134 formed in the flange portion 132 described above. That is, the flange portion 132 and the second support portion 182 are tightly coupled tightly. Accordingly, it is possible to prevent the oil in the solenoid valve 100 from leaking between the flange portion 132 and the second support portion 182. The bore inlet side of the modulator block 110 is deformed in a state where the flange portion 132 and the second support portion 182 are assembled. The deformed portion 115 of the modulator block 110 is deformed to cover the flange portion 132 to fix the flange portion 132 and the second support portion 182 so that the valve is fixed.

The third support part 183 is provided to face the spring support step 155 of the opening and closing member 150 and supports one end of the opening spring 175 as described above. At this time, as the second support portion 182 is fixed to the flange portion 132, the opening and closing member 150 is provided with an elastic force upward by the opening spring 175.

According to the present invention, a filter member 190 may be further provided to filter the foreign substances of the oil introduced through the inflow channel 113. The filter member 190 is installed outside the support member 180 and has a cylindrical shape. More specifically, the filter member 190 is mounted on the outer surface of the first support portion 181 of the support member 180, and the lower portion is mounted on the upper outer surface of the valve seat 120.

The solenoid valve 100 for the brake system removes the conventional seat support member 20 '(see FIG. 1) and presses the valve seat 120 directly into the second bore 112 of the modulator block 110 The cumulative tolerance caused by the assembly can be minimized, and the structure can be simplified as compared with the conventional structure, and the manufacturing can be easily performed. Further, the manufacturing cost can be reduced. Further, by fixing the support member 180 and the sleeve 130 to the modulator block 110, it is possible to prevent the oil from leaking out of the valve, and through the assembly structure, .

The opening and closing operation of the solenoid valve for a brake system having the above structure will now be described with reference to FIGS. 3 and 4. FIG.

2, when power is not applied to the excitation coil assembly (not shown), the restoring spring 171 pushes the armature 160 toward the second orifice 152, so that the second opening / The second orifice 152 is closed. The opening and closing member 150 is moved downward by the urging force of the restoring spring 171 transmitted through the armature 160 and the first opening and closing part 151 is moved downward by the elastic force of the opening spring 175, Lt; / RTI > Therefore, at this time, the oil does not flow from the inflow passage 113 to the discharge passage 114 of the modulator block 110.

Next, when power is applied to the excitation coil assembly, the armature 160 is rotated by the magnetic force acting between the armature 160 and the valve core (refer to '140' in FIG. 2) The second opening and closing part 162 is separated from the second orifice 152 of the opening and closing member 150 so that the second orifice 152 is opened. When the second orifice 152 is opened, oil flows into the sleeve 130 through the oil passage 154 of the opening and closing member 150 after passing through the filter member 190 from the oil passage 113. The oil flows through the second orifice 152 of the opening and closing member 150 to the discharge passage 114 through the inner passage 153 and the first orifice 121.

4, when the pressure difference between the upstream and the downstream of the second orifice 152 becomes small after the second orifice 152 is first opened, the opening / closing member 150 is elastically deformed by the elasticity of the opening spring 175, And the first orifice 121 having a large diameter is opened. Therefore, the oil flows to the discharge passage 114 through the first orifice 121 having a large diameter without passing through the second orifice 152. As described above, since the second orifice 152 having a small diameter is first opened and then the first orifice 121 having a large diameter is opened, the solenoid valve 100 of the present invention opens sequentially in two stages, The valve can be opened easily.

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: Modulator block
120: valve seat 121: first orifice
130: Sleeve 132: flange portion
134: Coupling piece 140: Valve core
150: opening / closing member 151: first opening /
152: second orifice 155: spring support chin
160: armature 162: second opening / closing part
171: Restoring spring 175: Opening spring
180: support member 190: filter member

Claims (5)

A solenoid valve for a brake system which is installed in a modulator block having a first bore communicating with an inlet flow path and a second bore communicating with an outlet flow path to control oil flow between the inlet flow path and the discharge flow path,
A valve seat which is press-fitted into the second bore and has a first orifice formed therein;
A sleeve having a cylindrical shape with an open top and a bottom and provided with a flange portion whose lower end is bent outwardly to be fixed to the modulator block;
A valve core coupled to seal the open top of the sleeve;
An opening and closing member provided in the first bore so as to move up and down and having an inner flow path formed therein and a first opening and closing part for opening and closing the first orifice on the lower side and a second orifice on the upper side formed smaller than the first orifice;
An armature movably installed in the sleeve and having a second opening and closing part for opening and closing a second orifice at a lower end thereof;
A restoring spring for urging the armature toward the second orifice; And
And an opening spring for moving the opening / closing member toward the armature for opening the first orifice,
Further comprising a support member having upper and lower openings,
Wherein the support member comprises:
A cylindrical first support portion having the opening and closing member therein and guiding the opening and closing member so as to be vertically movable;
A second support portion that is bent at an upper end of the first support portion to contact the lower surface of the flange portion; And
And a third support portion that extends from the lower end of the first support portion inwardly to support one end of the release spring,
And a stepped spring support step for supporting the other end of the opening spring is provided at an upper end of the opening / closing member. delete The method according to claim 1,
And the second support portion is fixed to the modulator block together with the flange portion. The method according to claim 1,
The flange portion is provided with a coupling piece formed by bending the outer end of the flange portion downward so that oil in the valve is not leaked between the flange portion and the second support portion,
And the second support portion is press-fitted to the engagement piece. The method according to claim 1,
Wherein a solenoid valve for a brake system is further provided on the outer side of the support member to filter foreign matter of oil flowing through the inflow channel.

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