KR102021469B1 - 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, coupled to the bottom of the magnet core, and having a slot at an outer diameter to allow the transfer of fluid through the slot; 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 are formed.

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 fluid flow delay even when the seal stopper is deformed.

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.

The solenoid valve for TC generally includes an armature 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 thread in communication with the orifice and coupled to the magnet core. The main component includes an outlet filter for forming an outer flow path between the stopper and the seal stopper, an inlet filter coupled to the seal stopper, and a lip seal fitted between the seal stopper and the inlet filter.

On the other hand, when the high temperature brake fluid passes through the solenoid valve for TC, permanent shape deformation due to thermal expansion occurs in the outer diameter of the seal stopper corresponding to the plastic injection product. That is, between the outer diameter of the seal stopper and the inner diameter of the block to form a flow path from the master cylinder to the wheel, there is a problem that the flow path can be reduced by the above-described shape deformation. In addition, the viscosity of the fluid increases as the temperature of the brake fluid gradually changes to a lower temperature.

Thus, there is a problem that a delay may occur in the flow of the fluid from the master cylinder to the wheel.

Conventionally, in order to solve the above-described problems, a method of reducing the outer diameter of the seal stopper as much as the shape is deformed has been sought.

However, there is a problem that the gap between the blocks is further widened according to the reduced outer diameter of the seal stopper, and the wear of the lip seal may be increased by the occurrence of lip thread pinching in the gap.

The present invention seeks to provide a solenoid valve for a brake system that enables the flow of fluid from the master cylinder to the wheel even with permanent deformation of the seal stopper.

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, coupled to the bottom of the magnet core, and having a slot at an outer diameter to allow the transfer of fluid through the slot; 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 solenoid valve for a brake system may be provided in which 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 part of the inlet filter are formed.

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 is provided to enable the movement of the fluid through the slot provided in the outer diameter of the seal stopper, even if the flow path between the seal stopper and the block is reduced due to the deformation of the seal stopper, thus delaying the fluid delay. To prevent it.

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. 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.

2 illustrates a solenoid valve 100 for a brake system according to an embodiment, FIG. 3 illustrates a perspective view of a seal stopper 170 according to an embodiment, and FIG. 4 illustrates an inlet filter according to an embodiment. (A) Top perspective view and (b) Bottom perspective view of 200) are shown.

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 includes an orifice flow path, a one-way flow path C1 which sequentially passes through a gap between the mesh portion 191, the block 10, and the lip seal 180 of the outlet filter 190. 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.

On the other hand, the brake fluid passing through the above-described flow paths exist under high temperature conditions, which may cause permanent shape deformation in the outer diameter of the seal stopper 170, which is a plastic injection product.

As a result of the above-described shape deformation, the gap flow path between the blocks 10 is reduced as the outer diameter of the seal stopper 170 increases, thereby causing a problem that the flow of the fluid may be delayed.

Therefore, referring to FIG. 3, the seal stopper 170 according to the exemplary embodiment includes a slot 171 at an outer diameter, so that the gap flow path between the blocks 10 is reduced according to the outer diameter expansion of the seal stopper 170. Flow of fluid through the slot 171 is now possible.

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.

Referring to FIG. 4, the inlet filter 200 includes a mesh part 204 positioned on an opposite surface of the first port 10A and a protrusion 202 contacting the block 10 laterally and preventing the inflow of foreign substances. do. 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.

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

On the other hand, the inner diameter pressing portion (not shown in the drawing) provided in the inner diameter of the inlet filter 200 is provided so that the seal stopper 170 disposed on the upper portion can be pressed. 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.

The above-described components are organically combined, and the solenoid valve 100 according to the embodiment has two flow paths, that is, the one-way flow path through the orifice 120a and the lip seal 180 that 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, and the outer passage 201 of the inlet filter 200 may be connected to the wheel cylinder 23. 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, 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 to prevent foreign substances from entering.

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
171: slot
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
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, coupled to the bottom of the magnet core, and having a slot at an outer diameter to allow the transfer of fluid through the slot;
An outlet filter forming an outer flow path between the seal stopper and the seal stopper;
An inlet filter coupled to the seal stopper; And
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 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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