KR101988513B1 - Solenoid valve for brake control system - Google Patents

Abstract

The present invention provides a solenoid valve for controlling a flow rate of a flow path connecting a first port and a second port, the solenoid valve being disposed inside the sleeve and lifting along an axial direction with the plunger to open and close the orifice of the seat; An elastic member for providing an elastic force to the amateur; A magnet core accommodating the sheet therein and providing a driving force to the amateur in a direction opposite to the elastic member; An orifice unit coupled to the lower side of the seat; A filter member coupled to a lower side of the orifice unit; And a lip seal fitted between the orifice unit and the filter member and having an inclined protrusion to allow only one-way transfer of fluid. The orifice flow path opened and closed by lifting and lowering the armature and the one-way flow path through the lip seal. Include.

Description

Solenoid valve for brake system {SOLENOID VALVE FOR BRAKE CONTROL SYSTEM}

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

A vehicle is essentially equipped with a hydraulic brake system for braking, and various types of systems have recently been proposed for obtaining a stronger and more stable braking force. Examples of hydraulic brake systems include an anti-lock brake system (ABS) to prevent wheel slippage during braking and a brake traction control system (BTCS) to prevent slippage of driving wheels during rapid start or acceleration of a vehicle. The Brake Traction Control System (ESC), the Anti-lock Brake System and the Traction Control are combined to control the brake hydraulic pressure, and the Electronic Stability System (ESC) is used to keep the vehicle stable.

Meanwhile, in the vehicle posture control system, a certain level of flow is required to operate and release the brake, and a plurality of electronically controlled solenoid valves are installed in the modulator block to implement such a system.

Solenoid valves used in the above-described brake system are generally inserted into the bore of the modulator block and are provided with a hollow valve housing having an inlet and an outlet communicating with the modulator block, and a hollow inserted into the valve housing and joined by welding. A cylindrical sleeve having a cylindrical shape, a valve seat press-fitted into the valve housing, the orifice is formed, a magnetic core joined by welding to a sleeve opposite the valve housing, and an armature removably mounted in the sleeve.

Patent Registration No. 10-1276072 (2013. 06. 18)

An embodiment of the present invention is to provide a solenoid valve for a brake system having a check valve function.

According to one aspect of the present invention, a solenoid valve for controlling the flow rate of the flow path connecting the first port and the second port, the solenoid valve disposed inside the sleeve, and along the plunger to move along the axial direction; An elastic member for providing an elastic force to the amateur; A magnet core providing a driving force to the amateur in a direction opposite to the elastic member; A sheet containing an orifice received in the hollow interior of the magnet core and opened and closed by the plunger; An orifice unit press-fitted into the hollow interior of the lower side of the sheet and having a hollow hole communicating with the orifice of the sheet; A lip seal coupled to the small diameter portion of the lower side of the orifice unit and having an inclined protrusion to allow only one-way transfer of the fluid; And the lip seal and the orifice unit. And a filter member for accommodating the lower portion of the seat and the magnet core sequentially to prevent foreign substances from entering. The solenoid passage includes an orifice flow path opened and closed by lifting the armature, and a directional flow path through the lip seal. Valves may be provided.

The orifice unit is provided with a large diameter portion for fastening the filter member and a small diameter portion in contact with the lip seal. The orifice unit may restrict the movement of the lip seal when the pressure is applied by constraining the lip seal together with the filter member.

The filter member may include a first filter located on an opposite surface of the first port and a second filter located on an opposite surface of the second port to prevent foreign substances from entering.

The filter member may further include a support part protruding downward to maintain a gap with the modulator block and to secure a flow path.

The lip seal may be accommodated inside the filter member such that the inclined protrusion is provided inside the lip seal, and the one-way flow passage may be provided to pass through the flow path hole provided in the orifice unit and the inclined protrusion.

Embodiment of the present invention is a solenoid valve having a check valve function using a lip seal, it is possible to simplify the hydraulic circuit design to reduce the cost and improve the mounting.

1 shows part of a typical electronic brake system.
2 shows a solenoid valve for a brake system according to an embodiment of the present invention.
3 shows (a) a plan view, (b) a sectional view of XX, and (c) a bottom view of an orifice unit according to an 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 presented to sufficiently convey the spirit of the present invention to those skilled in the art. The present invention is not limited to the embodiments presented herein but may be embodied in other forms. The drawings may omit illustrations of parts not related to the description in order to clarify the present invention, and may be exaggerated to some extent in order to facilitate understanding.

1 shows part of a typical electronic brake system. Referring to this, a general electronic brake system includes a pump piston 10 that operates in response to a pedal effort of a driver, a reservoir 20 that stores a working fluid, and a first and a second volume of which are changed by the pump piston 10. The first hydraulic line 31 connecting the pump chambers 10a and 10b, the first pump chamber 10a and the pair of wheels, and the second hydraulic pressure connecting the second pump chamber 10b and the other pair of wheels A solenoid valve 41 and a first check valve 42, a second pump chamber 10b and a reservoir (30) installed in parallel in a line connecting the line 32, the first pump chamber 10a and the reservoir 20. And a second check valve 43 installed in a line connecting the 20.

The electronic brake system generates a required pressure by operating the pump piston 10 by driving the motor by calculating and receiving a Travel Sensor signal when the driver presses the brake pedal.

On the other hand, the integrated brake system (IDB) uses a pump piston 10 capable of reciprocating movement, the first check valve 42 (Check Valve) for suction of the working fluid from the reservoir 20 at the forward pressurization and the reverse pressurization Apply solenoid valve (41) to maintain pressure.

The first check valve 42 is separately provided to smoothly supply the working fluid to the inside of the first pump chamber 10a when driving the motor to operate the pump piston 10 to generate the required pressure (forward pressurization). . In this case, the solenoid valve 41 and the first check valve 42 are complicated in configuration and costly to produce because individual components must be installed in parallel.

In addition, since the flow path configuration must be added in order to apply the first check valve 42, the brake system circuit design becomes complicated and the block size is also affected. In the present invention described below, by applying a solenoid valve having a check valve function, unnecessary hydraulic circuits such as a check valve and a hydraulic line to which the check valve is installed can be deleted.

Figure 2 shows a solenoid valve for a brake system according to an embodiment of the present invention, Figure 3 is a (a) plan view and (b) XX of the orifice unit 190 according to an embodiment of the present invention And (c) bottom view. Hereinafter, the present invention will be described with reference to these drawings.

Solenoid valve 100 according to an embodiment of the present invention may be pressed into the bore of the modulator block (10). In addition, the solenoid valve 100 is disposed inside the sleeve 160 and is lifted along the axial direction along with the plunger 140 to open and close the orifice 120a of the seat 120 and the armature 150 and the armature 150. An elastic member 130 for providing an elastic force to the magnet core 110 for receiving the seat 120 therein and providing a driving force to the armature 150 in a direction opposite to the elastic member 130. The orifice unit 190 to be coupled, the filter member 170 is coupled to the lower side of the orifice unit 190, and is fitted between the orifice unit 190 and the filter member 170 and provided with an inclined protrusion (180a) in one direction of the fluid It includes a lip seal 180 to allow only transport.

The solenoid valve 100 includes a first opening portion 100A provided on a surface opposite to the first port 10A and a second opening portion 100B provided on a surface opposite to the second port 10B. At this time, the solenoid valve 100 opens and closes the flow path to the armature 150 which is lifted and lifted by the magnet core 110, and the second opening 100B and the first opening 10A through the first opening 100A. The flow rate of the flow path connecting the two ports 10B can be controlled.

The magnet core 110 is coupled in the form of being inserted or welded to the lower side of the sleeve 160 to close the open lower portion of the sleeve 160. Although not shown, a coupling groove may be formed in the magnet core 110 for tight coupling between the magnet core 110 and the sleeve 160, and may be assembled by pressing the sleeve 160 into the coupling groove. This coupling structure facilitates coupling of the sleeve 160 and the magnet core 110 compared to the conventional welding method and can simplify the coupling process.

The sleeve 160 is press-fitted or welded to the magnet core 110, accommodates the amateur 150 therein, and constrains the widthwise movement of the amateur 150, thereby guiding the amateur 150 to be elevated only in the longitudinal direction. .

The sheet 120 may be press-fitted into a hollow portion provided in the magnet core 110. The seat 120 is provided with an orifice 120a to adjust the flow rate of the fluid passing through the flow path by opening and closing the orifice 120a of the plunger 140 to be described later.

The amateur 150 is installed to be able to move up and down inside the sleeve 160, and may have a shape corresponding to that of the sleeve 160 having a larger diameter at the lower side than the upper side. And the lower end is provided with a plunger 140 in contact with the sheet 120.

The plunger 140 may extend from the lower side of the amateur 150 toward the seat 120, and a step may be formed to receive elastic force from the elastic member 130 supported by the magnet core 110.

Referring to FIG. 3, the orifice unit 190 is provided with a hollow hole 190a for flow control and is press-fitted under the seat 120, but corresponds to the inner diameter of the filter member 170 on the opposite side of the seat 120. An inner step, which is a small diameter portion 192 for assembling the large diameter portion 191 and the lip seal 180, is provided. The orifice unit 190 may be formed with a flow path hole 190b for fluid flow in the one-way flow path C1.

Lip seal 180 is installed between the inner surface of the filter member 170 and the outer surface of the orifice unit 190, the inclined protrusion (180a) is provided inside the lip seal 180, one-way flow path (C1) is an orifice unit ( It may be provided to pass through the passage hole 190b and the inclined protrusion 180a provided in 190.

The lip seal 180 is accommodated inside the filter member 170 such that the inclined protrusion 180a is in contact with the outer circumferential surface of the small diameter portion 172 of the orifice unit 190, and is deformed by a pressure difference and inclined inward to protrude. The protrusion 180a may be provided to allow only one-way transfer of the fluid. When the pressure of the second port 10B is greater than the pressure of the first port 10A, the inclined protrusion 180a is bent in the narrowing direction to form the one-way flow path C1, but the pressure of the first port 10A is reversed. When the pressure is smaller than the pressure of the second port 10B, the one-way flow path C1 is not formed due to the bending direction.

The filter member 170 is positioned on the opposite surface of the first port 10A to prevent the inflow of foreign substances, and the second filter is disposed on the opposite surface of the first filter 170a and the second port 10B to prevent the inflow of foreign substances. The support part 170c which protrudes below and maintains the space | interval of 170b and the modulator block 10 and secures a flow path is provided. And it is assembled under the orifice unit 190, it is possible to limit the movement of the lip seal 180 when the pressure acts by restraining the lip seal 180 together with the orifice unit 190.

The solenoid valve 100 according to an embodiment of the present invention may be provided with a one-way flow path (C1) through the orifice flow path and the lip seal 180 to be opened and closed by lifting the two places, that is, the amateur 150.

The orifice flow path is normally open and can be closed upon operation of the valve. When electricity is applied to the magnet core 110 generates a magnetic force to lower the amateur 150, while the amateur 150 compresses the elastic member 130, the plunger 140 is moved to contact the orifice 120a. The flow of fluid passing through the orifice 120a and the hollow hole 190c of the orifice unit 190 is blocked.

The one-way flow path C1 may be a path through which the working fluid is transferred in one direction to the first port 10A via the second port 10B, the flow path hole 190b, and the inclined protrusion 180a of the lip seal 180. . In this case, the inclined protrusion 180a may be bent inward when the pressure of the second port 10B is relatively greater than that of the first port 10A, thereby performing a check valve function.

Although the present invention has been described with reference to one embodiment shown in the accompanying drawings, this is merely exemplary, and those skilled in the art may realize various modifications and equivalent other embodiments therefrom. I can understand. Therefore, the true scope of the invention should be defined only by the appended claims.

1: solenoid valve 2: check valve
10: modulator block 10A: first port
10B: 2nd port 100: solenoid valve
100A: first opening 100B: second opening
110: magnet core 120: sheet
130: elastic member 140: plunger
150: amateur 160: sleeve
170: filter member 180: lip seal
190: Orifice unit 191: Large diameter part
192: small diameter portion 120a: orifice
170a: first filter 170b: second filter
170c: support portion 180a: inclined protrusion portion
190a: hollow hole 190b: euro hole
C1: one-way euro

Claims (5)

In the solenoid valve for controlling the flow rate of the flow path connecting the first port and the second port,
An arm disposed inside the sleeve and lifting along the axial direction with the plunger;
An elastic member for providing an elastic force to the amateur;
A magnet core providing a driving force to the amateur in a direction opposite to the elastic member;
A sheet containing an orifice received in the hollow interior of the magnet core and opened and closed by the plunger;
An orifice unit press-fitted into the hollow interior of the lower side of the sheet and having a hollow hole communicating with the orifice of the sheet;
A lip seal coupled to the small diameter portion of the lower side of the orifice unit and having an inclined protrusion to allow only one-way transfer of the fluid; And
The lip seal, the orifice unit. And a filter member that sequentially receives the seat and the lower portion of the magnet core and prevents foreign substances from entering.
A solenoid valve for a brake system including an orifice flow path opened and closed by lifting and lowering the armature, and a one-way flow path through the lip seal. The method of claim 1,
The orifice unit is
A large diameter portion for fastening the filter member and a flow path hole spaced apart from the hollow hole side to form a path of the one-way flow path,
A solenoid valve for a brake system capable of restricting the movement of the lip seal when pressure is applied by constraining the lip seal together with the filter member. The method of claim 2,
The filter member is a solenoid valve for a brake system having a first filter located on the opposite surface of the first port and the second filter located on the opposite surface of the second port for preventing foreign matter from entering. The method of claim 3,
The filter member is provided with a solenoid valve for the brake system further maintains a distance from the modulator block and has a support projecting to the lower side to secure the flow path. The method of claim 4, wherein
The lip seal is installed inside the filter member so that the inclined protrusion is provided inside the lip seal,
And the one-way flow path passes through the second filter, the flow path hole, the inclined protrusion and the first filter.

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