KR100413314B1 - Solenoid valve of ABS - Google Patents

Abstract

The present invention relates to a solenoid valve of an anti-lock brake system, and an object thereof is to improve a coil assembly fixing structure in which a coil is wound in a cylindrical shape, to facilitate assembly thereof, and to reduce manufacturing cost.

According to the solenoid valve 30 of the anti-lock brake system according to the present invention, by firmly fitting the bobbin 32b to the sleeve 31e, the coil assembly 32 is firmly directly attached to the valve assembly 31 without a separate member. Is fixed. Accordingly, the workability of assembling the solenoid valve 30 is further improved, and manufacturing cost of the overall antilock brake system is also reduced.

Description

Solenoid valve of anti-lock brake system

The present invention relates to a vehicle antilock brake system, and more particularly, to a solenoid valve of an antilock brake system mounted on a modulator block to substantially control hydraulic transmission to the hydraulic brake side.

In general, the vehicle is equipped with a hydraulic brake mounted on the front wheel and the rear wheel for the purpose of deceleration or stop while driving, and a power booster and a master cylinder for forming a braking hydraulic pressure and transmitting it to the hydraulic brake side. Therefore, when the driver presses the brake pedal, hydraulic pressure is formed in the master cylinder, which is transmitted to the hydraulic brake to generate braking force.

However, when the driver presses the brake pedal to control the increase / sustainment of the braking force, the braking force generated by the hydraulic brake generated by the braking pressure due to the braking pressure is greater than that of the road surface or the road surface conditions are changed. If it is larger, the tire slips on the road. In order to effectively prevent such slip phenomenon and to obtain a strong and stable braking force, the anti-lock brake system controls the braking hydraulic pressure transmission to the hydraulic brake side through a plurality of solenoid valves.

Such a solenoid valve includes a valve assembly installed on an aluminum modulator block and a coil assembly installed on an ECU. A detailed mounting structure thereof will be described below with reference to FIG. 1.

First, the valve assembly 2a provided with the orifice flow path of the solenoid valve 2 is compactly installed in the modulator block 1 of the conventional anti-lock brake system.

The ECU 3 includes a housing 3a having a rectangular wall, a circuit board 3b mounted in a separate space below the housing 3a, and a solenoid valve 2 fixed inside the housing 3a. It is provided with a coil assembly (2b) and is coupled to the modulator block (1) through a bolt (3c) installed in the corner portion of the housing (3a).

In the coil assembly 2b, a coil 2c is wound in a cylindrical shape, and a conductor 2d for electrically connecting to the circuit board 3b is provided to extend. In addition, when the ECU housing 3a and the modulator block 1 are coupled to each other, the end of the valve assembly 2a is allowed to pass through the coil assembly 2b. Accordingly, when a current is applied to the coil assembly 2b, an electric field is formed therein, which causes the valve assembly 2a of the solenoid valve 2 to open or close.

The coil assembly 2b is fixed by a fixing member 4 whose lower end is overmolded with a rubber material so as to allow a slight movement in the transverse direction and the axial direction. That is, the lower part of the coil assembly 2b is molded and fixed by 'SANTOPLENE OVER MOLDER', which is a kind of rubber, so that the valve assembly 2a mounted on the modulator block 1 and the coil assembly 2b mounted on the ECU housing 3a are fixed. ) Is easily assembled, and frictional shock noise at the coil assembly 2b side is prevented.

However, since the solenoid valve 2 of the anti-lock brake system fixes the coil assembly 2b by rubber overmolding, there is a problem that the fixing operation takes a long time. That is, as described above, the coil assembly 2b of the solenoid valve 2 is fixed in the internal place of the ECU housing 3a and then fixed through the process of overmolding rubber, thereby mounting the coil assembly 2b. Not only is the process difficult, but the working time is long, which leads to an increase in manufacturing cost.

The present invention is to solve this problem, an object of the present invention is to directly fix the coil assembly to the end of the valve assembly to facilitate their installation and at the same time anti-lock which can reduce the overall manufacturing cost of the anti-lock brake system It is to provide a solenoid valve of a brake system.

1 is a cross-sectional view showing a conventional solenoid valve mounting structure.

2 is a cross-sectional view showing a part of the solenoid valve mounting structure of the anti-lock brake system according to the present invention.

3 is an exploded perspective view of the coil assembly according to the present invention.

4 is a cross-sectional view showing another embodiment of the present invention.

5 is an exploded perspective view of a coil assembly according to another embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

11.ECU housing 20.Modulator block

30. Solenoid valve 31. Valve assembly

31e.Sleeve 32.Coil Assembly

32b. Bobbin 32c. Leadwire

32d..case 32e ..

32g..Home

The present invention for achieving this object is; A solenoid valve of an anti-lock brake system having a valve assembly mounted on a modulator block and having a cylindrical assembly mounted in a cylindrical sleeve to open and close an orifice, and a coil assembly installed to surround the armature.

The coil assembly is configured to be fixed directly to the sleeve.

In addition, the coil assembly has a bobbin coil wound around the outer periphery of the sleeve, a lead wire connected to the end of the coil to guide the power supply, and a cylindrical case whose end is open to allow the bobbin to be fitted and coupled thereto; , The bobbin is characterized in that the coupling hole having a predetermined inner diameter is provided in the longitudinal direction so as to forcibly fit the sleeve.

In addition, the opening portion of the case is characterized in that the guide groove for extending the lead wire to the outside is formed, or the configuration is characterized in that the guide hole for extending the lead wire to the outside is provided on the closed surface of the case.

According to this configuration, the coil assembly is directly fixed to the valve assembly through the coupling hole formed in the bobbin, thereby improving the assembly workability of the solenoid valve and reducing the overall manufacturing cost of the antilock brake system.

Hereinafter, one preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings. 2 is a cross-sectional view showing a partial extract of the solenoid valve mounting structure of the anti-lock brake system according to the present invention, Figure 3 is an exploded perspective view of the coil assembly according to the present invention.

Referring to FIG. 2, the ECU 10 to which the present invention is applied includes an ECU housing 11 having a bottom surface and a wall surface and having an open top, and a circuit board PCB 12 mounted in the ECU housing 11. The overall control of the antilock brake system. In addition, a plurality of solenoid valves 30, a motor (not shown), a pump (not shown), a modulator block 20 having compactly mounted low and high pressure accumulators (not shown) is provided on the top of the ECU housing 11. Is coupled through a bolt (13).

The solenoid valve 30 is installed in the simulator block 20, the valve assembly 31 having the orifice 31a and the coil assembly 32a is wound around the coil assembly for opening and closing the orifice 31a depending on whether the power is applied ( 32), the detailed structure of which is as follows. (The solenoid valve is divided into the NO type solenoid valve which is connected to the upstream hydraulic line of the hydraulic brake and is normally opened and the NC type solenoid valve which is normally closed and connected to the downstream hydraulic line. In the invention, the NO type solenoid valve will be described as an example.)

First, the valve assembly 31 has an inlet 31b and an outlet 31c formed at one end of the valve assembly 31 press-fitted to the modulator block 20, and the valve core 31d having the orifice 31a disposed in the axial direction, and the valve core. A cylindrical sleeve 31e provided to extend in the axial direction at the other end of 31d, an armature 31f built in the sleeve 31e so as to move forward and backward, and a coil spring type elastic body for restoring the armature 31f. The member 31g is included. In addition, the armature 31f is provided with a plunger 31h extending in the shape of a rod and provided with a valve seat 31i at the tip end thereof. (In case of a normal closed solenoid valve, the valve seat of the plunger is normally configured to keep the orifice closed.)

As shown in FIG. 3, the coil assembly 32 includes a bobbin 32b on which the coil 32a is wound, a lead wire 32c connected to an end of the coil 32a to guide power supply, It is provided with the cylindrical case 32d which the upper part opened so that the bobbin 32b may be wrapped. The coil assembly 32 is directly coupled to the sleeve 31e through the bobbin 32b to wrap around the armature 31f without a separate member. To this end, a coupling hole 32e having an inner diameter D2 slightly smaller than the diameter D1 of the sleeve 31e is provided in the longitudinal direction at the center of the plastic bobbin 32b, whereby the coil assembly 32 is a conventional sleeve. It is forcibly fitted to 31e. On the other hand, the bobbin 32b may be inserted into the sleeve 31e to allow the coil assembly 32 to be directly fixed to the sleeve 31e through the joining means.

In addition, the coil assembly 32 directly coupled to the sleeve 31e is electrically connected to the circuit board 12 through the connecting lead 14 and the lead wire 32c to receive power. The circuit board 12 When arranged in the upper space 11a of this ECU housing 11, the lead wire 32c is also comprised so that it may be located in the upper side of the bobbin 32b. That is, the lead wire 32c is insert-fixed at the upper part during injection molding of the bobbin 32b so as to be connected to the coil 32a, and the tip is extended laterally. In order to arrange the lead wire 32c, a guide groove 32g is formed on the open portion 32f side of the case 32d and is cut open. Accordingly, when the bobbin 32b is inserted into the case 32d through the opening 32f, the lead wire 32c is exposed laterally through the guide groove 32g.

Next will be described the assembly process and the effects of the solenoid valve 30 according to the present invention configured as described above.

First, the sleeve 31e of the valve assembly 31 is forcibly inserted into the bobbin 32b coupling hole 32e of the coil assembly 32. As described above, the inner diameter D2 of the coupling hole 32e is The coil assembly 31 is forcibly fitted to the sleeve 31e because the sleeve 31e is slightly smaller than the diameter D1. Then, one end of the valve core 31d of the valve assembly 31 is inserted into the bore processing portion 21 of the modulator block 20 and temporarily assembled, and then forcedly fixed using a caulking tool (not shown). At this time, the lead wire 32c is exposed to the case 32c side through the guide groove 32g.

Then, the circuit board 12 is provided in the upper space 11a of the ECU housing 11, and the lead wire 32c exposed through the connection lead 14 and the circuit board 12 are electrically connected. When the bolt 13 is tightened by matching the modulator block 20 on the ECU housing 11, the modulator block 20 and the ECU housing 11 are firmly coupled to each other.

Through this series of processes, the solenoid valve 30, the ECU housing 11, and the modulator block 20 are coupled to each other. The coil assembly 32 is coupled to the coupling hole 32e of the bobbin 32b when the solenoid valve 30 is assembled. By directly fixing to the sleeve 31e of the valve assembly 31 through (), it is easily and firmly mounted without requiring a separate member and at the same time there is no play between the coil assembly 32 and the sleeve 31e. No frictional noise is generated.

In addition, the coil assembly 32 is supplied with power through the lead wire 32c connected to the circuit board 12. When the circuit board 12 is installed in the upper space 11a of the ECU housing 11, the lead wire ( Since 32c is disposed to be exposed to the outside through the guide groove 32g formed on the side of the opening 32f of the case 32d, electrical connection with the circuit board 12 is made easier.

On the other hand, the technical idea of the present invention has been described in the case where the circuit board 12 is installed in the upper space (11a) of the ECU housing 11 as an example, as shown in Figures 4 and 5 is covered with a cover (11c) In the case where the circuit board 12 'is installed in the lower space 11b of the ECU housing 11, the technical idea of the present invention can be applied. However, it is preferable to arrange the lead wire 32c 'in the direction in which the circuit board 12' is installed. In this case, the lead wire 32c 'has a long hole shape on the lower side of the case 32d, that is, the closed surface 32h of the case 32d. The guide hole 32i is formed and the lead wire 32c 'is extended so that the bobbin 32b may extend below. Accordingly, when the bobbin 32b is inserted into the case 32d and then press fit to the sleeve 31e, the lead wire 32c 'is exposed downward through the guide hole 32i to the case 32d, whereby the connecting lead The connection to the circuit board 12 disposed in the lower space 11b of the ECU housing 11 is facilitated through the reference numeral 14.

In addition, although the technical idea of the present invention has been described as directly fixing the coil assembly 32 to the sleeve 31e through the bobbin 32b inserted into the case 32d, the bobbin 32b is not limited thereto. By forcibly coupling the sleeve 31e to the usual case 32d, the desired purpose of the present invention for directly fixing the coil assembly 32 can be achieved.

As described in detail above, according to the solenoid valve of the anti-lock brake system according to the present invention, the coil assembly is directly and firmly fixed to the valve assembly without a separate member by forcibly fitting the bobbin to the sleeve. Accordingly, the assembly workability of the solenoid valve is further improved, and the overall manufacturing cost of the antilock brake system is also reduced.

Claims (4)

A solenoid valve of an anti-lock brake system having a valve assembly mounted on a modulator block and having a armature retracted in a cylindrical sleeve to open and close an orifice, and a coil assembly installed to surround the armature. Solenoid valve of the anti-lock brake system, characterized in that the coil assembly 32 is fixed directly to the sleeve (31e). The method of claim 1, The coil assembly 32 has a bobbin 32b having a coil 32a wound around its outer circumference and through which the sleeve 31e is coupled, and a lead wire 32c connected to an end of the coil 32a to guide power supply. ), And a cylindrical case 32d having one end opened so that the bobbin 32b is fitted and coupled thereto. Solenoid valve of the anti-lock brake system, characterized in that the bobbin (32b) is provided with a coupling hole (32e) having a predetermined inner diameter (D2) in the longitudinal direction so as to forcibly fit the sleeve (31e). The method of claim 2, A solenoid valve of an anti-lock brake system, characterized in that a guide groove (32g) is formed on the open portion (32f) side of the case (32d) to extend the lead wire (32c) to the outside. The method of claim 2, Solenoid valve of the anti-lock brake system, characterized in that the closing surface (32h) of the case (32d) is provided with a guide hole (32i) for extending the lead wire (32c ') to the outside.