KR102016383B1 - Solenoid valve for brake system - Google Patents

Abstract

A solenoid valve for a brake system is disclosed. The solenoid valve for a brake system according to the present invention is disposed in the sleeve, the armchair along the 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; A seal stopper in communication with the orifice and coupled to the bottom of the magnet core; An outlet filter forming an outer flow path between the seal stopper; An inlet filter coupled to the lower side of the seal stopper; A lip seal fitted between the seal stopper and the inlet filter and having an inclined protrusion to allow only one-way transfer of the fluid; including an orifice flow path opened and closed by raising and lowering the armature, a mesh part of the outlet filter, and a deformation of the lip seal. A gap between the formed block and the lip seal, and a one-way flow passage through the mesh portion of the inlet filter is formed, the inlet filter includes a protrusion inclined toward the outside so that the chamber is provided on the inside, the inside of the lip seal is in the chamber It is provided to be inserted.

Description

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

The present invention relates to a solenoid valve for a brake system that can prevent a delay of fluid flow even with a shape change of a lip seal.

Among the brake systems for vehicles, there is an anti-lock brake system (hereinafter referred to as 'ABS') that prevents road slippage by periodically regulating the braking pressure transmitted to the wheel side.

In addition to the basic ABS configuration described above, the recently developed vehicle ABS includes a brake traction control system (BTCS: BRAKE TRACTION) that prevents slippage of wheels and road surfaces when the vehicle starts and starts to smoothly start. CONTROL SYSTEM) is further provided.

Generally, the traction control system installs a separate traction control solenoid valve (hereinafter referred to as 'TC solenoid valve') in a hydraulic line connecting the outlet side of the master cylinder and the outlet side of the high pressure accumulator, and the outlet of the master cylinder. A first bypass passage connecting a side hydraulic line and an inlet hydraulic line of the hydraulic pump and a second bypass passage connecting an outlet side of the master cylinder at the outlet side of the high-pressure accumulator are provided. A valve is installed and a pressure regulating valve is installed in the second bypass passage.

Solenoid valve for TC Generally, an actuator for opening and closing an orifice, an elastic member for providing an elastic force to the amateur, a magnet core for providing a driving force to the amateur in a direction opposite to the elastic member, and a seal stopper connected to the orifice and coupled to the magnet core And an outlet filter for forming an outer flow path between the seal stopper, an inlet filter coupled to the seal stopper, and a lip seal fitted between the seal stopper and the inlet filter as main components.

On the other hand, when the brake fluid passes through the TC solenoid valve, the viscosity of the fluid gradually increases due to the ambient temperature. Thus, the lip seal made of ethylene propylene rubber is subjected to an external force by the highly viscous fluid.

Since a portion of the inlet filter existing in the lower portion of the lip seal has a planar shape in the related art, when the lip seal subjected to the fluid resistance is brought into contact with the above-described flat portion, it is forced to be compressed in the axial direction.

That is, the lip seal in contact with the support of the planar shape by the fluid resistive force is pressed in the axial direction, and accordingly, a shape change occurs in which the lip seal opens in the radial direction.

Between the lip seal and the block is formed a flow path from the master cylinder to the wheel, the flow path can be reduced by the above-mentioned shape change in the radial direction of the lip seal, thus causing a delay in the flow of fluid from the master cylinder to the wheel There is a problem that can be.

Accordingly, there is a need for changing the shape of the inlet filter portion in contact with the lip seal so as to minimize the change in the radial shape of the lip seal.

The present invention is to provide a solenoid valve for a brake system capable of flowing the fluid from the master cylinder to the wheel even in the shape change of the lip seal.

In addition, the present invention is to provide a solenoid valve for a brake system that can simultaneously implement the function of controlling the flow rate by the electromagnetic force and the check valve function for securing the flow rate during emergency braking.

According to one aspect, the armature disposed inside the sleeve, and along the plunger to move in the axial direction 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; A seal stopper in communication with the orifice and coupled to the bottom of the magnet core; An outlet filter forming an outer flow path between the seal stopper and the seal stopper; An inlet filter coupled to the seal stopper; An lip seal fitted between the seal stopper and the inlet filter and having an inclined protrusion to allow only one-way transfer of fluid; an orifice flow path opened and closed by lifting and lowering the armature, a mesh part of the outlet filter; A gap formed between the block formed by the deformation of the lip seal and the lip seal, and a one-way flow path passing through the mesh portion of the inlet filter is formed, the inlet filter includes a protrusion inclined toward the outside so that the chamber is provided on the inside In addition, a solenoid valve for a brake system may be provided such that an inner side of the lip chamber may be inserted into the chamber.

An upper end of the outlet filter may be in close contact with the magnet core, a lower end may be in close contact with the block, and the one-way flow passage may pass through an outer flow path between the outlet filter and the seal stopper.

The seal stopper may include an upward protrusion that forms an outer flow path between the outlet filter, and a sheet fastening part to which an inner diameter part of the sheet is coupled.

The seal stopper is supported on the inclined surface of the block to limit the movement in the downward direction, and includes a side projection for maintaining a distance between the block, the one-way flow path can pass through the gap between the seal stopper and the block have.

The inlet filter may include an inner diameter press-fit part for pressing the seal stopper, and a lower portion of the protrusion of the inlet filter may be supported by the block to prevent separation from the seal stopper.

The inlet filter may be provided with a mesh portion in the outer flow path on the one-way flow path and the inner flow path on the orifice flow path.

The solenoid valve for the brake system according to the present invention minimizes the radial shape change of the lip seal by inserting the lip seal into the chamber formed inside the protrusion of the inlet filter even if the flow path between the lip seal and the block is reduced by the radial shape change of the lip seal. Therefore, the flow delay of the fluid can be prevented in advance.

In addition, the seal stopper includes an upper protrusion forming an outer flow path between the outlet filter and a sheet fastening portion to which the inner diameter portion of the sheet is coupled, and the seal stopper is press-fitted into the inner diameter press-fit portion on the upper portion of the inlet filter, The lower portion of is supported on the block can be improved ease of assembly.

In addition, the seal stopper is supported on the inclined surface of the block to limit the movement in the downward direction, and includes a side projection for maintaining a distance between the block, one-way flow passage through the gap between the seal stopper and the block formed by the side projection Thus, it is possible to prevent the distortion or the permanent deformation of the lip seal by preventing a distortion that may occur in the assembly or the product and to flow a uniform flow rate in the lip seal.

In addition, two flow paths, that is, an orifice flow path opened and closed by an ascending and descending of the amateur, and a one-way flow path through the lip seal, can simultaneously control the flow rate by electromagnetic force and the check valve function to secure the flow rate during CBS emergency braking. .

In addition, the outlet filter and the inlet filter are each provided with a single filter chain mesh for removing foreign matters from the fluid flowing through the orifice flow path and the one-way flow passage, and the foreign matters of the fluid flowing from both sides of the orifice flow passage and the one-way flow passage with a single mesh portion. You can remove all of them.

1 is a hydraulic circuit diagram of an anti-lock brake system including a solenoid valve for a conventional traction control system.
2 illustrates a solenoid valve for a brake system according to an embodiment.
3 is a perspective view of a seal stopper according to an exemplary embodiment.
4 illustrates (a) an upper perspective view and (b) a lower perspective view of an inlet filter according to an embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments introduced below are provided as an example to sufficiently convey the spirit of the present invention to those skilled in the art to which the present invention pertains. The invention is not limited to the embodiments described below and may be embodied in other forms. Parts not related to the description are omitted in the drawings in order to clearly describe the present invention, in the drawings, the width, length, thickness, etc. of the components may be exaggerated for convenience. Like numbers refer to like elements throughout.

1 is a hydraulic circuit diagram of an anti-lock brake system including a solenoid valve for a conventional traction control system. Referring to the drawings, a vehicle ABS to which the present invention is applied is installed in the middle of the hydraulic line connected from the master cylinder 20 to the wheel-side wheel cylinder 23, NO (Normal Open) type solenoid valve 24 for opening and closing the supply flow path Is provided, and a NC (Normal Close) solenoid valve 25 for opening and closing the flow path of the fluid returned from the wheel side is provided.

When the NO type solenoid valve 24 is open, the NC type solenoid valve 25 is closed to apply braking pressure to the wheel side. When the NO type solenoid valve 24 is closed, the NC type solenoid valve 25 is opened. And the brake pressure of the wheel is released.

The ABS is provided with a hydraulic pump 26 for repressurizing the fluid returned from the wheel-side wheel cylinder 23 to the upstream side of the NO-type solenoid valve 24, and a buffer space (BUFFER upstream and downstream of the hydraulic pump 26). A low pressure accumulator 27 and a high pressure accumulator 28 are provided.

The low pressure accumulator 27 provided upstream of the hydraulic pump 26 functions to temporarily store the brake fluid returning from the wheel side and to supply the hydraulic fluid to the hydraulic pump 26 side, and to the downstream side of the hydraulic pump 26. The high pressure accumulator 28 to be installed serves to attenuate the pressure pulsation caused by the operation of the hydraulic pump 26 while temporarily storing the fluid pressurized in the hydraulic pump 26. These devices are controlled by an ECU (ELECTRIC CONTROL UNIT, not shown).

The ECU controls the NO type and NC type solenoid valves 24 and 25 to open and close the flow path supplied to the wheel side, and also controls the driving of the hydraulic pump 26 to return to the low pressure accumulator 27 through the return flow path. The fluid is repressurized to the wheel side to provide intermittent braking.

The vehicle ABS is equipped with a brake traction control system (BTCS) that prevents slippage of wheels and road surfaces at the start of the vehicle so that the vehicle can start smoothly.

The brake traction control system has a separate hydraulic line 29a for connecting the outlet hydraulic line of the master cylinder 20 and the inlet hydraulic line of the hydraulic pump 26. The hydraulic line 29a is provided with a reciprocating hydraulic valve 29 which closes the flow path when the driver presses on the brake pedal 22 and maintains a state of being normally opened. This is to ensure that the braking hydraulic pressure is transmitted only to the wheel side of the vehicle when the driver normally presses the brake pedal 22.

In addition, the brake traction control system maintains a normally open state in a hydraulic line connecting the outlet side of the master cylinder 20 and the outlet side of the high-pressure accumulator 28, and when a road surface slip of the wheel occurs due to a sudden start of the vehicle, etc. By closing the valve, the TC solenoid valve 30 is installed so that the braking pressure generated by the driving of the hydraulic pump 26 can be transmitted to the wheel side.

At this time, the solenoid valve 30 for TC is a NO valve, which normally opens the flow path and closes the flow path upon receiving an electric signal, but in one-way fluid transfer from the master cylinder 20 to the wheels 23 in parallel. Check valves may be provided.

FIG. 2 shows a solenoid valve 100 for a brake system according to an embodiment, FIG. 3 shows (a) side cross-sectional view and (b) perspective view of the seal stopper 170 according to one embodiment, and FIG. 4. Shows (a) the top perspective view and (b) the bottom perspective view of the inlet filter 200 according to one embodiment. Referring to this, the solenoid valve 100 of the present invention is press-fitted into the bore of the modulator block 10, it can perform the check valve function provided in parallel with the conventional TC solenoid valve 30 of FIG. The solenoid valve 100 has a portion to control the flow rate by the electromagnetic force, and at the same time having a check valve configuration for securing the flow rate during CBS emergency braking.

The solenoid valve 100 is disposed inside the sleeve 160 and is lifted along the axial direction along with the plunger 140 to the amateur 150 and the amateur 150 that open and close the orifice 120a of the seat 120. It is in communication with the elastic member 130 for providing the elastic force, the magnet core 110 for receiving the seat 120 therein and providing the driving force to the amateur 150 in the opposite direction to the elastic member 130, the orifice 120a The outer flow passage 190a between the seal stopper 170 and the seal stopper 170 coupled to the lower side of the magnet core 110 and having a slot 171 at an outer diameter to allow the transfer of fluid through the slot 171. The outlet filter 190, the inlet filter 200 is coupled to the lower side of the seal stopper 170, the seal stopper 170 and the inlet filter 200 is sandwiched between the inclined projections 180a to form a fluid Lip chamber 180 to allow only one-way transfer.

The solenoid valve 100 sequentially passes through the orifice flow path, the mesh portion 191 of the outlet filter 190, the clearance between the block 10, the lip seal 180, and the mesh portion 204 of the inlet filter 200. The flow path C1 is provided. At this time, the solenoid valve 100 opens and closes the orifice 120a flow path by the armature 150 lifting and lowered by the magnet core 110, and the solenoid valve 100 is connected to the first port 10A and the second port 10B. Flow rate 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 accommodated in a hollow part provided in the magnet core 110 and may be press-fitted. 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. 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.

The seal stopper 170 includes an upward protrusion 174 that forms an outer flow passage 190a between the outlet filter 190 and a sheet fastening portion 173 to which an inner diameter portion of the sheet 120 is coupled. At this time, the sheet fastening portion 173 may protrude upward so as not to be separated from the inner diameter of the sheet 120.

The seal stopper 170 includes a lateral protrusion 172 supported on the inclined surface 12 of the block 10 to limit downward movement and to maintain a gap between the block 10 and the one-way flow path C1. May pass through a clearance flow path formed between the seal stopper 170 and the block 10 formed by the lateral protrusion 172.

At this time, for example, eight side protrusions 172 may be provided over the outer diameter of the seal stopper 170.

In addition, the side projections 172 prevent the distortion that may occur in the assembly or the product to allow a uniform flow of the lip chamber 180 to prevent damage or permanent deformation of the lip chamber. Further, the side protrusion 172 may prevent the lip seal 180 from being caught between the seal stopper 170 and the block 10 when pressure is applied from the lower side of the lip seal 180.

The lip seal 180 is accommodated under the seal stopper 170, the inclined protrusion 180a is provided outside the lip seal 180, and the one-way flow path C1 is an outer flow path 190a provided in the outlet filter 190. And, it may be provided to pass through the inclined protrusion (180a) and the outer flow path 201 of the inlet filter 200.

The lip seal 180 may be fastened to the outer peripheral surface of the lower small diameter portion of the seal stopper 170 and may have an inclined protrusion 180a that protrudes outwardly and is deformed by a pressure difference 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 inclined protrusion 180a is bent in a direction in which the one-way flow path C1 is not formed.

The outlet filter 190 includes a mesh portion 191 positioned on the opposite surface of the second port 10B and an outer flow passage 190a formed between the seal stopper 170 and the magnet core 110. It may be installed in a form surrounding the outer surface. In addition, the upper end of the outlet filter 190 is in close contact with the magnet core 110, the lower end is in close contact with the block 10, and the one-way flow path C1 is an outer flow path between the outlet filter 190 and the seal stopper 170. May pass through 190a.

At this time, the outlet filter 190, for example, may be provided in a shape in which the upper and lower symmetry.

The inlet filter 200 is provided with a mesh portion 204 positioned on the opposite surface of the first port 10A and preventing the inflow of foreign matter, and a protrusion 202 contacting the block 10 laterally. In this case, the protrusion 202 may restrict the movement of the lip chamber 180 when the pressure is applied by restraining the lip chamber 180 together with the seal stopper 170.

On the other hand, since a portion of the inlet filter existing in the lower portion of the lip seal conventionally has a planar shape, when the lip seal subjected to the fluid resistance comes into contact with the above-mentioned flat portion, the lip seal is pressed in the axial direction and thus the lip seal is opened in the radial direction. There has been a problem that a shape change occurs.

In addition, the shape change of the lip seal described above causes a problem that the flow path from the master cylinder to the wheel may be reduced between the lip seal and the block.

Referring to FIG. 4, the inlet filter 200 according to the exemplary embodiment includes a protrusion 202 having an inclined shape toward the outside. Thus, the chamber 200a may be provided inside the protrusion 202.

When the lip chamber 180 contacts the inlet filter 200, the inside of the lip chamber 180 may be inserted into the chamber 204, thereby minimizing the phenomenon that the lip chamber 180 opens in the radial direction.

The inlet filter 200 may be provided with a support part 203 protruding downward to maintain a gap with the modulator block 10 and to secure a flow path.

An inner diameter press-fitting portion (not shown) provided in the inner diameter of the inlet filter 200 is provided to allow the seal stopper 170 disposed thereon to be press-fitted.

In addition, a lower portion of the protrusion 202 of the inlet filter 200 may be supported by the block 10 to prevent separation from the seal stopper 170. Since the lower portion of the seal stopper 170 is fixed by the inlet filter 200, separation due to vibration or shaking is prevented.

In the solenoid valve 100 according to an embodiment, the above-described components are organically coupled, and two flow paths, that is, the one-way flow path through the orifice 120a and the lip seal 180, which are opened and closed by lifting and lowering the amateur 150. (C1) may be provided.

The flow path of the orifice 120a may be normally open and then closed when the valve is operated. 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. As a result, the flow of fluid passing through the orifice 120a, the seal stopper 170, and the inlet filter 200 is blocked.

The one-way flow passage C1 functioning as a check valve allows only one-way flow from the second port 10B to the first port 10A. The one-way flow path C1 is a clearance between the mesh part 191, the outlet filter 190, the seal stopper 170, and the gap outer path 190a of the master cylinder located at the side of the second port 10B, and the seal stopper ( The gap between the 170 and the block 10, the outer surface of the inclined protrusion 180a, the outer passage 201 and the mesh unit 204 of the inlet filter 200 may be connected to the wheel cylinder 23. have. In this case, when the pressure of the second port 10B is relatively greater than that of the first port 10A, the lip seal 180 may be bent inwardly to implement the check valve function.

The inlet filter 200 may include a mesh portion 204 in the outer flow passage 201 and the inner flow passage, and the mesh portion 204 may be provided at, for example, a central portion of the inlet filter 200. Thus, foreign matters may be prevented from entering the lip seal 180 from the wheel of the first port 10A and the leakage of the lip seal 180 may be prevented. Filters are provided at the inlet and the outlet of the one-way flow path C1 and the orifice 120a, respectively, to prevent foreign substances from flowing from the wheel to the master cylinder or from the master cylinder to the wheel.

In other words, conventionally, the fluid directed from the first port 10A communicating with the master cylinder to the lip seal 180 does not pass through the filter, but in the present invention, the fluid passes through the mesh portion 191 of the outlet filter 190. Since it is directed to the lip seal 180, foreign matters from the master cylinder to the lip seal 180 side are prevented. At this time, in order to prevent foreign substances from entering, the upper end of the outlet filter 190 may be in close contact with the magnet core 110 and the lower end may be in close contact with the block 10.

In addition, in the related art, the fluid having passed through the lip seal is provided through the mesh part on the front surface of the inlet filter, but the mesh part 204 is provided at the center of the inlet filter 200. The fluid passing through 180 may not necessarily pass through the mesh portion 204.

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.

10: Modulator block
10A: first port
10B: second port
12: slope
20: master cylinder
21: booster
22: brake pedal
23: wheel cylinder
24: NO type solenoid valve
25: NC type solenoid valve
26: hydraulic pump
27: low pressure accumulator
28: high pressure accumulator
29: hydraulic valve
29a: hydraulic line
30: TC solenoid valve
100: solenoid valve
100A: first opening
100B: second opening
110: magnet core
120: sheet
120a: orifice
130: elastic member
140: plunger
150: Amateur
160: sleeve
170: seal stopper
172: side projection
173: seat fastening
174: upward projection
180: lip seal
180a: inclined protrusion
190: outlet filter
190a: outer channel
191: mesh part
200: inlet filter
200a: chamber
201: Outer Euro
202: protrusion
203: support
204: mesh part
C1: one-way euro

Claims (6)

An arm disposed inside the sleeve and lifting along the axial direction along 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;
A seal stopper in communication with the orifice and coupled to the bottom of the magnet core;
An outlet filter forming an outer flow path between the seal stopper and the seal stopper;
An inlet filter coupled to the seal stopper;
A lip seal fitted between the seal stopper and the inlet filter and having an inclined protrusion to allow only one-way transfer of the fluid.
An orifice flow path opened and closed by lifting and lowering the amateur,
A gap between the mesh portion of the outlet filter, the block formed by the deformation of the lip seal and the lip seal, and a one-way flow path passing through the mesh portion of the inlet filter are formed.
The inlet filter includes a protrusion inclined toward the outside so that the chamber is provided on the inside,
The inner side of the lip seal is provided to be inserted into the chamber,
The upper end of the outlet filter is in close contact with the magnet core, the lower end is in close contact with the block,
The one-way flow path passes through the outer flow path between the outlet filter and the seal stopper,
The seal stopper
An upward projection which forms an outer flow path between the outlet filter,
Solenoid valve for a brake system including a seat fastening portion coupled to the inner diameter of the seat. delete delete The method of claim 1,
The seal stopper is supported on the inclined surface of the block includes a side projection for limiting the movement in the downward direction and maintaining a distance between the block,
The one-way flow path solenoid valve for the brake system passing through the gap between the seal stopper and the block. The method of claim 1,
The inlet filter includes an inner diameter press-fit portion for press-fitting the seal stopper,
A solenoid valve for a brake system for supporting a lower portion of the protrusion of the inlet filter to the block to prevent separation from the seal stopper. The method of claim 1,
The inlet filter is
The solenoid valve for a brake system provided with a mesh portion in the outer flow path on the one-way flow path and the inner flow path on the orifice flow path.

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