KR101922473B1 - Solenoid valve for brake control system - Google Patents

Abstract

The present invention relates to a solenoid valve for controlling a flow rate of a flow path connecting a first port and a second port, which comprises: a valve housing installed in a modulator block; an amateur arranged in the valve housing, and controlling a flow rate of a working fluid by lifting along an axial direction; and a first elastic member provided with a damping unit inserted between a magnet core and the amateur, and providing an elastic force to the amateur in a direction opposite to a driving force of the magnet core.

Description

SOLENOID VALVE FOR BRAKE CONTROL SYSTEM "

The present invention relates to a solenoid valve used in a brake system that generates a braking force by using an electrical signal corresponding to a displacement of a brake pedal.

The vehicle is essentially equipped with a hydraulic brake system for braking. Recently, various types of systems have been proposed for obtaining a more powerful and stable braking force. Examples of the hydraulic brake system include an anti-lock brake system (ABS) that prevents slippage of the wheel during braking and a brake traction control system (BTCS) that prevents slippage of the drive wheel during sudden acceleration or sudden acceleration of the vehicle. Brake Traction Control System), and an Electronic Stability System (ESC) that stably maintains the running condition of the vehicle by controlling brake fluid pressure by combining an anti-lock brake system and traction control.

On the other hand, in the case of the vehicle attitude control system, a certain level of flow rate is required to be transmitted and received in the brake operation. In order to realize such a system, a plurality of electronically controlled solenoid valves are installed in the modulator block.

The solenoid valve used in the above-described brake system generally includes a hollow valve housing inserted into the bore of the modulator block and having a first opening and a second opening communicating with the modulator block, A valve seat having an orifice press-fitted into the valve housing, a magnetic core coupled to the sleeve opposite to the valve housing by welding, and an armature movably provided in the sleeve, the sleeve having a hollow cylindrical shape, do.

Patent Registration No. 10-1276072 (Mar. 18, 2013)

An embodiment of the present invention seeks to provide a solenoid valve for a brake system with reduced NVH.

According to an aspect of the present invention, there is provided a solenoid valve for controlling a flow rate of a flow path connecting a first port and a second port, the solenoid valve comprising: a valve housing installed in a modulator block; An armature disposed inside the valve housing and moving up and down along an axial direction to adjust a flow rate of the working fluid; A first elastic member for providing an elastic force to the armature; A magnet core for providing a driving force to the armature in a direction opposite to the first elastic member; And a damper member interposed between the magnet core and the armature.

A sleeve guiding the lifting and lowering of the armature, the magnet core being fastened to an upper portion thereof, and the valve housing being fastened to a lower portion thereof; And a filter member provided on an outer surface of the valve housing and having a mesh portion provided on an opposite surface of the first port, wherein one end of the first elastic member is in contact with the groove of the armature and the other end is in contact with the damper member As shown in Fig.

A sleeve guiding the lifting and lowering of the armature, the magnet core being fastened to an upper portion thereof, and the valve housing being fastened to a lower portion thereof; A first valve seat located below the armature and having an orifice opened and closed by the armature; A second elastic member for providing an elastic force to the first valve seat; And a second valve seat fixed to the valve housing and having a flow path that is opened and closed by lifting and lowering the first valve seat, wherein both ends of the first elastic member are in contact with the magnet core and the damper member have.

The damper member may include a restricting portion to be fitted in the groove of the armature, a protrusion provided on the opposing surface of the magnet core, and a fastening portion to fasten the first elastic member.

Further comprising a lip seal which is engaged with the valve housing and has a slant projection that is deformed by a pressure difference to allow only one-way transfer of fluid, wherein the flow path includes a first flow path opened and closed by lifting and lowering of the armature, And a second flow path formed by a deformation of the second flow path.

The NVH performance can be improved by applying an elastic member having a damping portion in a contact portion between the armature inside the valve and the magnet core. The damping part of the elastic member is fastened between the armature inside the valve and the magnet core to reduce the noise and vibration generated when the armature and the magnet core come into contact with each other.

In addition, the first elastic member can simultaneously reduce the production cost of the solenoid valve by performing the function of applying the elastic force to the armature and the function of mitigating the impact between the armature and the magnet core in one configuration.

Figure 1 shows a portion of a typical electronic brake system.
2 shows a solenoid valve for a brake system according to a first embodiment of the present invention.
3 is an enlarged view of the first elastic member according to the first embodiment of the present invention.
4 shows a solenoid valve for a brake system according to a second embodiment of the present invention.
5 shows a solenoid valve for a brake system according to a third 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.

Figure 1 shows a portion of a typical electronic brake system. With reference to this, a typical electronic brake system is provided with a pedal simulator that allows the driver to feel a feeling similar to a conventional braking system when the pedal is depressed. The pedal simulator is connected to the master cylinder. A solenoid valve (1) (Solenoid Valve) and a check valve (2) (Check Valve) are installed on the connection path to mediate the operation of the pedal simulator.

On the other hand, since the solenoid valve 1 and the check valve 2 have to be installed in parallel with each other, the structure is complicated and the production cost is high. Particularly, since the solenoid valve 1 always operates when the driver depresses the brake pedal, it is disadvantageous in terms of NVH (noise, vibration, harshness).

Fig. 2 shows a solenoid valve for a brake system according to the first embodiment of the present invention. Fig. 3 shows an enlarged view of the first elastic member 140 according to the first embodiment of the present invention.

Referring to the drawings, a solenoid valve 100 according to a first embodiment of the present invention includes a valve housing 110 installed in a modulator block 10, a valve housing 110 disposed in the valve housing 110, A first elastic member 140 for providing an elastic force to the armature 130 and a driving force for moving the armature 130 in a direction opposite to the first elastic member 140 And a damping portion 140c sandwiched between the magnet core 160 and the armature 130 and provides an elastic force to the armature 130 in a direction opposite to the driving force of the magnet core 160 The first elastic member 140 may include a first elastic member 140.

The solenoid valve 100 includes a first opening portion 100A provided on a surface opposed to the first port 10A and a second opening portion 100B provided on a surface opposed to the second port portion 10B. At this time, the solenoid valve 100 opens and closes the flow path to and from the armature 130, which is raised and lowered by the magnet core 160, so that the second opening portion 100B and the second opening portion 100B are opened from the first port 10A through the first opening portion 100A, It is possible to control the flow rate of the flow path connecting the two ports 10B.

The valve housing (110) is embedded in the bore of the modulator block (10). The valve housing 110 has a hollow portion along the vertical length direction inside the valve housing 110 so as to extend from the first opening portion 100A to the second opening portion 100B of the solenoid valve 100 or from the second opening portion 100B to the first opening portion 100A A second flow path C2 through which the working fluid flows between the lip seal 180 and the modulator block 10 in a circumferential direction to be described later can be formed.

The sleeve 120 may be press-fit or welded to the valve housing 110 and the magnet core 160 may be installed on the sleeve 120. [ The sleeve 120 accommodates the armature 130 therein and restrains the movement of the armature 130 in the width direction to guide the armature 130 only in the longitudinal direction.

The armature 130 is installed in the sleeve 120 so as to be movable upward and downward, and includes a large diameter portion and a small diameter portion. The large diameter portion moves along the inner surface of the sleeve 120, and the small diameter portion comes into contact with the valve seat of the valve housing 110 at its tip.

The groove 130c of the armature 130 forms a seating surface on which the first elastic member 140 to be described later is fitted. A groove having a shape corresponding to that of the first elastic member 140 is formed on the armature 130 so that the first elastic member 140 can be easily inserted.

The first elastic member 140 may be installed such that one end of the first elastic member 140 contacts the groove 130c of the armature 130 and the other end thereof contacts the magnet core 160. The first elastic member 140 applies an elastic force to the armature 130 so that the solenoid valve 100 can maintain a normally closed state. If the magnetic core 160 is not normally magnetized, the armature 130 is kept pressed down by the first elastic member 140. When the magnet core 160 generates a magnetic force, the armature 130 Is increased to open the first flow path C1.

The first elastic member 140 has a wrinkle portion 140a for generating an elastic force due to a restoring force against contraction or expansion and a second elastic member 140 which protrudes from the outer surface of the wrinkle portion 140a to restrain the movement of the first elastic member 140 in the width direction A protrusion 140b and a damping portion 140c functioning as a plastic damper between the armature 130 and the magnet core 160. [ The first elastic member 140 is made of plastic material so that the wrinkle portion 140a, the protrusion 140b and the damping portion 140c are both shrunk or expanded by the elasticity of the material and the wrinkle shape, To move up and down along the groove 130c. The damping portion 140c can reduce noise and vibration generated when the armature 130 and the magnet core 160 are in contact with each other.

The magnet core 160 is coupled to the upper side of the sleeve 120 to close the opened upper portion of the sleeve 120. Although not shown, a coupling groove may be formed in the magnet core 160 for more tight coupling between the magnet core 160 and the sleeve 120, and the sleeve 120 may be press-fitted to the coupling groove. This coupling structure facilitates the coupling of the sleeve 120 and the magnet core 160 compared to the conventional welding method and simplifies the coupling process.

The filter member 170 is provided on the outer surface of the valve housing 110, and has a mesh portion 170a provided on an opposite surface of the first port 10A. The filter member 170 prevents foreign matter contained in the working fluid flowing through the first flow path C1 from flowing in or out.

The lip seal 180 is fitted to the outer circumferential surface of the valve housing 110 and has an inclined protrusion 180a which is deformed by a pressure difference to allow only one-way transfer of fluid. The inclined projection 180a is bent in a direction to narrow the pressure of the second port 10B when the pressure of the second port 10B is larger than the pressure of the first port 10A to form the second flow path C2. Is smaller than the pressure of the second port (10B), the second flow path (C2) is not formed by bending in a widening direction.

The operation of the solenoid valve 100 according to the first embodiment of the present invention will now be described. When the tandem master cylinder (TMC) is operated under a high pressure condition, the valve moves to the magnet core 160 side while the first elastic member 140 compresses the armature 130 which is in contact with the lower end orifice portion of the valve housing 110 . When the lower end orifice of the valve housing 110 is opened, the flow rate moves to the pedal simulator (not shown) side and the simulator piston operates. When the pressure is released, the working fluid inside the pedal simulator moves through the lower end orifice of the valve housing (110) and the lip seal (180), enabling the piston operation of the pedal simulator and normal return to the original state. The lip seal 180 replaces the check valve function.

Meanwhile, the damping portion 140c of the first elastic member 140 can reduce noise generated when the armature 130 hits the magnet core 160. Noise and vibration occur when the armature 130 moves to contact the magnet core 160. Hybrid vehicles and EV vehicles are much quieter than general internal combustion engine vehicles, Thereby preventing the problem from being recognized.

Since the first elastic member 140 performs a function of exerting an elastic force on the armature 130 and a function of relieving the impact between the armature 130 and the magnet core 160 in a single configuration, the solenoid valve 100, Can be reduced.

4 shows a solenoid valve for a brake system according to a second embodiment of the present invention. Referring to this, a valve structure in which the first elastic member 240 is provided inside the magnet core 260 can be disclosed. It is a 2-stage ESV.

The solenoid valve 200 for a brake system according to the second embodiment includes a sleeve 220 guiding the lifting and lowering of the armature 230 and having the magnet core 260 fastened to the upper portion and the valve housing 210 fastened to the lower portion. A first valve seat 291 disposed below the armature 230 and having an orifice 291a opened and closed by the armature 230, a second elastic member 292 providing elastic force to the first valve seat 291, And a second valve seat 293 fixed to the housing 210 and having a flow path opened and closed by lifting and lowering the first valve seat 291. Both ends of the first elastic member 240 are connected to the magnet core 260, And the armature 230, respectively.

The solenoid valve 200 can form a two-step flow path in which the magnet core 260 is operated and the armature 230 rises. A flow path provided between the first valve seat 291 and the second valve seat 293 and a flow path provided through the orifice 291a. These two flow paths can be opened or closed by the magnetic force of the magnet core 260. Depending on the cross-sectional area of the required flow path, only one flow path can be opened or both of them can be opened.

5 shows a solenoid valve for a brake system according to a third embodiment of the present invention. Referring to the drawings, a solenoid valve 300 according to a third embodiment of the present invention includes a valve housing 310 installed in a modulator block 10, a valve housing 310 disposed in the valve housing 310, An armature 330 for ascending and descending to adjust a flow rate of the working fluid, and a first elastic member 340 for providing an elastic force to the armature 330.

The valve housing 310 is integrally formed with a sleeve to guide the armature 330 up and down. And a first valve seat 391 having an orifice 391a located below the armature 330 and being opened and closed by the armature 330. [ And a second elastic member 392 that provides an elastic force to the first valve seat 391. Both ends of the first elastic member 340 can be in contact with the magnet core 360 and the armature 330, respectively. Further, the lip seal 380 is fitted to the outer circumferential surface of the valve housing 310 and has a slant projection 380a that is deformed by a pressure difference, thereby allowing only one-way transfer of fluid.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, You will understand. Accordingly, the true scope of the invention should be determined only by the appended claims.

1: Solenoid valve 2: Check valve
10: Modulator block 100: Solenoid valve
100A: first opening portion 100B: second opening portion
110: valve housing 120: sleeve
130: Amateur 130c: Home
140: first elastic member 140a:
140b: projecting portion 140c: damping portion
160: Magnet core 170: Filter element
180: lip seal 180a: incline projection
200: Solenoid valve 200A: First opening
200B: second opening 210: valve housing
220: sleeve 230: armature
230c: groove 240: first elastic member
260: Magnet core 260c: Home
260d: step portion 270: filter member
291: first valve seat 292: second elastic member
293: second valve seat 300: solenoid valve
300A: first opening portion 300B: second opening portion
310: valve housing 330: armature
330c: groove 340: first elastic member
360: Magnet core 370: Filter element
380: Lip seal 380a: Inclined projection
391: first valve seat 392: second elastic member
C1: first flow path C2: second flow path

Claims (5)

A solenoid valve for controlling a flow rate of a flow path connecting a first port and a second port,
A valve housing installed in the modulator block;
An armature disposed inside the valve housing and moving up and down along the axial direction to adjust a flow rate of the working fluid;
A magnet core for providing a driving force to the armature; And
And a first elastic member having a damping portion fitted between the magnet core and the armature and providing an elastic force to the armature in a direction opposite to a driving force of the magnet core. The method according to claim 1,
The first elastic member
A wrinkle portion for generating an elastic force by restoring force against contraction or expansion,
And a protrusion protruding from an outer surface of the wrinkle portion and restricting a widthwise movement of the first elastic member. 3. The method of claim 2,
A sleeve guiding the lifting and lowering of the armature, the magnet core being fastened to an upper portion thereof, and the valve housing being fastened to a lower portion thereof;
And a filter member installed in the valve housing to surround the second port,
Wherein the first elastic member is provided so that one end thereof is in contact with the armature and the other end thereof is in contact with the magnet core. 3. The method of claim 2,
A sleeve guiding the lifting and lowering of the armature, the magnet core being fastened to an upper portion thereof, and the valve housing being fastened to a lower portion thereof;
A first valve seat located below the armature and having an orifice opened and closed by the armature;
A second elastic member for providing an elastic force to the first valve seat;
And a second valve seat fixed to the valve housing and having a flow path opened and closed by raising and lowering the first valve seat,
Wherein the first elastic member is provided so that one end thereof is in contact with the armature and the other end thereof is in contact with the magnet core. 5. The method according to any one of claims 1 to 4,
Further comprising a lip seal which is engaged with the valve housing and has an inclined projection that is deformed by a pressure difference to allow only one-way transfer of fluid,
The flow path
And a second flow path formed by the deformation of the slant projections. The solenoid valve for a brake system according to claim 1, wherein the first flow path is opened and closed by the armature.

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