KR100784816B1 - Solenoid Valve for ABS - Google Patents

Abstract

The present invention relates to a solenoid valve for an anti-lock brake system, wherein an inner diameter of an elastic body is provided at an inner circumference of the valve seat so that an inner diameter of the elastic body can be varied according to internal pressure. There is an effect of making it easier to control the flow rate through the orifice.

Description

Solenoid valve for anti-lock brake system {Solenoid Valve for ABS}

1 is a cross-sectional view showing the internal configuration of a solenoid valve for an antilock brake system which is generally used.

2a is an enlarged view of an orifice of a solenoid valve for an antilock brake system according to the invention.

2B is an explanatory view of the orifice of a solenoid valve for an antilock brake system according to the present invention.

Explanation of symbols on the main parts of the drawings

10: valve seat 11: orifice

12: elastic body

The present invention relates to an antilock brake system, and more particularly, to an orifice of a solenoid valve for controlling braking hydraulic pressure transmission by closing or opening in ABS control.

In general, the vehicle is equipped with a hydraulic brake for braking the front wheels and the rear wheels, a power booster that forms and transmits the braking hydraulic pressure to the hydraulic brake side, and a master cylinder. When the driver presses the brake pedal, the braking hydraulic pressure is formed. It is transmitted to the brake to generate braking force. However, when the driver presses the brake pedal to control the increase / sustained braking force, if the braking pressure is greater than the road surface state, or if the friction force from the hydraulic brake is greater than the braking force generated from the tire or the road surface, the tire slips on the road surface. Is generated.

In order to effectively prevent such slip phenomenon and to obtain a strong and stable braking force, the antilock brake system is provided with a plurality of solenoid valves, accumulators and pumps for controlling the braking hydraulic pressure transmitted to the hydraulic brake side.

The valve assembly of the accumulator, the pump and the solenoid valve is compactly provided in the modulator block made of aluminum, and the coil assembly of the circuit board and the solenoid valve for controlling the driving of the pump and the solenoid valve is disposed in the ECU.

At this time, the solenoid valve is divided into a normal-open solenoid valve disposed on the upstream side of the hydraulic brake and normally kept open, and a normally closed solenoid valve disposed on the downstream side and kept normally closed.

Referring to FIG. 1, a conventional normally open solenoid valve (hereinafter referred to as a NO type solenoid valve) has an inlet 1b and an outlet 1c formed therebetween, and a valve seat 1e having a perforated orifice 1d therebetween is formed. A valve assembly disposed in the axial direction and a coil assembly 2 composed of a kind of solenoid wound around the coil 2a to form a magnetic force upon application of current.                         

The valve assembly 1 includes a magnet core 1a having a lower end compactly mounted on an aluminum modulator block 4, and the magnet core 1a moves forward and backward by a magnetic force to open and close the orifice 1d. The valve device 3 is installed.

The lower end of the magnet core (1a) is processed in the axial direction inlet (1b) is associated with the hydraulic line on the master cylinder side, the outlet (1c) processed on the magnet core (1) side is the hydraulic brake (not shown) of It is associated with the inlet of the wheel cylinder side and the normally closed solenoid valve (not shown).

In addition, the valve device 3 has a cylindrical sleeve 3a which is press-fitted to the upper end of the magnet core 1a exposed to the outside of the modulator block 4, and is capable of moving forward and backward in the sleeve 3a. Armature 3b.

The armature 3b is installed to be accommodated in the coil assembly 2, and is provided with a plunger 3c extending in a rod shape at the lower end and having a sphere 3d at the lower end. The plunger 3c is slidably disposed in the magnet core 1a in the axial direction together with the armature 3b, so that the sphere 3d opens and closes the orifice 1d of the valve seat 1e.

In addition, a coil spring type return spring 3e is disposed between the lower end of the plunger 3c and the orifice 1d for the return of the armature 3b. As a result, the sphere 3d of the plunger 3c is kept in the open state of the orifice 1d by the elastic support force of the return spring 3e. (In the case of a normal closed solenoid valve, the sphere of the plunger is normally orifice. Will remain closed.)

In the anti-lock brake system equipped with the NO type solenoid valve configured as described above, if the vehicle is caught by excessive pressure from the master cylinder to the hydraulic brake side during ABS operation, the ECU supplies power to the coil assembly (2) of the NO type solenoid valve. Block the flow path between the master cylinder side and the hydraulic brake.

That is, when power is applied to the coil assembly 2, a magnetic field is formed around the coil assembly 2, whereby the armature 3b and the plunger 3c overcome the elastic force of the return spring 3e, That is, it is pulled to the magnet core 1a side. At this time, as the plunger 3c is lowered integrally with the armature 3b, the sphere 3d is seated on the upper part of the orifice 1d, and the orifice 1d is closed, so that the braking hydraulic pressure generated by the master cylinder or the pump is directed to the hydraulic brake side. Delivery is blocked.

The power supply is cut off when additional hydraulic pressure is required to the hydraulic brake side under control of ECU during braking. At this time, the armature 3b with the plunger 3c rises upward by the elastic restoring force of the return spring 3e, whereby the sphere 3d of the plunger 3c opens the orifice 1d again. When braking hydraulic pressure is transmitted from the side, it is transmitted to the hydraulic brake side through the orifice 1d.

However, the conventional normal open solenoid valve conventionally regulates the flow rate by restricting the flow of oil by simply opening and closing the plunger, so that the amount of oil passing through the valve during slip control is equal to the flow rate of the oil during normal braking. Become the same.

Therefore, when adopting such a conventional solenoid valve, it is difficult to precisely adjust the flow rate of the hydraulic pressure it is impossible to perform accurate slip control.

 The present invention is to solve this problem, an object of the present invention is to provide a variable orifice for an anti-lock brake system that allows the orifice to vary naturally according to the pressure conditions by varying the material of the orifice and the valve seat. To provide.

In order to achieve the above object, the present invention provides a magnet seat having an inlet and an outlet formed at one end thereof and a perforated orifice therebetween, and a magnet core having a conventional sleeve mounted at the other end thereof, and installed to surround the sleeve. A coil assembly that forms a magnetic field upon application, an armature that is built up and down in the sleeve, and is lowered when power is applied to the coil assembly, and is disposed through the magnet core in an axial direction to interlock with the armature to open and close the orifice. A solenoid valve for an anti-lock brake system having a plunger provided with a valve surface at the center of a lower surface thereof, and a return spring disposed between the plunger and the valve seat for returning the armature and the plunger. Ring-shaped elastic body made of high elastic material According to the internal air pressure is for a solenoid valve for anti-lock brake system, characterized in that the inner diameter of the elastic body can be varied.
In addition, the inner peripheral portion of the valve seat 10 is provided with a recess, the outer peripheral portion of the elastic body 12 is provided with a protrusion inserted into the recessed portion, the inner peripheral portion of the elastic body to form the orifice 11 to be formed. It may be a solenoid valve for an anti-lock brake system, characterized in that the inclined surface is provided on the upper and lower surfaces, respectively.

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In general, since the structure of the solenoid valve is the same as described above, a description thereof will be omitted.                     

Hereinafter, an orifice which is a characteristic configuration of the present invention will be described.

Referring to FIG. 2A, the valve seat 10 provided on the outer circumference of the orifice 11 is made of an elastic body 12 having a high elastic force unlike the related art. The contacting part of the orifice 11 with the valve seat 10 is provided to be stepped, and the inner circumference of the orifice 11 through which the fluid passes is made of an inclined cross section.

As shown in FIG. 2B, the orifice maintains the shape (A) during normal braking, and the cross-sectional diameter of the orifice is expanded to the shape (A ′) during slip control, thereby increasing the flow rate through the orifice.

As described above, the variable shape orifice for the anti-lock brake system according to the present invention consists of an elastic body having a high elastic force in the inner diameter portion of the orifice in order to facilitate the flow rate adjustment during general braking and slip control, and the flow rate according to the pressure. It has the effect of making it easy to adjust.

Claims (2)

A valve seat 10 having an inlet and an outlet formed at one end thereof, and having an orifice 11 perforated therebetween, and a magnet core having a conventional sleeve mounted at the other end thereof, and installed to surround the sleeve to generate a magnetic field when power is applied. A coil assembly to be formed, an armature which is built up and lowered in the sleeve and descends when power is applied to the coil assembly, and is disposed through the magnet core in an axial direction to interlock with the armature to open and close the orifice 11. In the solenoid valve for the anti-lock brake system having a plunger provided with a valve surface in the center of the lower surface and a return spring disposed between the plunger and the valve seat for returning the armature and the plunger, Solenoid valve for the anti-lock brake system, characterized in that the inner circumferential portion of the valve seat 10 is provided with a ring-shaped elastic body 12 of a high elastic force can be changed in the inner diameter of the elastic body in accordance with the internal pressure. The method of claim 1, The inner peripheral portion of the valve seat 10 is provided with a recess, the outer peripheral portion of the elastic body 12 is provided with a protrusion inserted into the recessed portion, the inner peripheral portion of the elastic body on the upper and lower surfaces to form the orifice 11 Solenoid valve for anti-lock brake system, characterized in that each inclined surface is provided.

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