KR102037084B1 - Check valve - Google Patents

Abstract

A check valve is started. According to an aspect of the present invention, in the check valve installed in the bore of the modulator block having the inflow passage and the discharge passage to control the one-way flow of oil, the center is open so that the upper and lower ends are open to communicate with the inflow passage and the discharge passage A valve housing having an orifice formed therethrough and a flange portion protruding around an outer surface to be fixed to the bore; A spring retainer coupled to one end of an open end of the valve housing adjacent to the discharge passage and having a discharge port communicating with the discharge passage; A plunger installed to be movable up and down in the orifice while being elastically supported by a spring supported by the spring retainer and having a communication groove for opening and closing the orifice according to the lifting and lowering movement; And a lip seal coupled to a mounting groove formed on an outer circumferential surface of the plunger to be in contact with the orifice and having a lip portion configured to allow flow of oil from the inflow passage to the discharge passage.

Description

Check Valve {CHECK VALVE}

The present invention relates to a check valve, and more particularly to a check valve provided in the hydraulic flow path of the electronically controlled brake system.

In general, the brake system is to effectively prevent wheel slippage that may occur during braking, rapid start, or rapid acceleration of the vehicle, and includes a plurality of solenoid valves for controlling braking hydraulic pressure transmitted from the master cylinder to the wheel cylinder. A plurality of check valves for preventing the reverse flow of oil is installed in the modulator block having a flow path forming a hydraulic circuit to control the braking hydraulic pressure. Recently, an electronic brake system has been used in which a hydraulic pressure supply device for supplying pressure to a wheel cylinder by receiving a driver's braking intention as an electric signal from a pedal displacement sensor that senses displacement of a brake pedal by a driver stepping on the brake pedal has been used. The structure of such an electronic brake system is disclosed in Korean Patent Publication No. 10-2013-0092045. According to the disclosed literature, an electronic brake system provided with a hydraulic pressure supply device is configured to generate a braking pressure by operating a motor in accordance with a pedaling force of a brake pedal. At this time, the braking pressure is generated by converting the rotational force of the motor into linear motion to pressurize the piston.

The flow path formed in the modulator block is provided with a check valve in a timely manner to control the flow of oil in one direction. For example, the check valve is installed in a flow path connecting the pressure supply device and the reservoir and a flow path connected to the inflow valve of each hydraulic circuit. However, these check valves have a relatively low sealing performance against low and high pressures, and are provided in a structure that is assembled into one sub-assembly. The problem is that the system becomes difficult to package.

Korean Patent Publication No. 2013-0092045 (published Aug. 20, 2013)

The check valve according to the embodiment of the present invention has excellent sealing performance and is installed to perform the function according to the processed hydraulic circuit without any position restriction so as to improve the degree of freedom of design.

In addition, the check valve according to an embodiment of the present invention to provide a large flow rate required by the environment and driving conditions.

According to an aspect of the present invention, the check valve is installed in the bore of the modulator block having the inflow passage and the discharge passage to control the one-way flow of oil, the center is open so that the upper and lower ends are open to communicate with the inflow passage and the discharge passage A valve housing having an orifice formed therethrough and a flange portion protruding around an outer surface to be fixed to the bore; A spring retainer coupled to one end of an open end of the valve housing adjacent to the discharge passage and having a discharge port communicating with the discharge passage; A plunger installed to be movable up and down in the orifice while being elastically supported by a spring supported by the spring retainer and having a communication groove for opening and closing the orifice according to the lifting and lowering movement; And a lip seal coupled to a mounting groove formed on an outer circumferential surface of the plunger to be in contact with the orifice and having a lip portion configured to allow flow of oil from the inflow passage to the discharge passage.

In addition, the orifice may include a first stepped portion protruding toward the center side to support the plunger in a longitudinal direction, and a second stepped portion formed in surface contact with the lip portion, and the second stepped portion may have a tapered stepped surface. have.

In addition, the plunger is disposed in the orifice so that one end is supported on the first stepped portion to guide the movement of the plunger and the other end is elastically supported by the spring, and one end of the plunger communicates with the inflow passage in the radial direction with respect to the center. At least one communication groove may be formed.

In addition, when the plunger pressurizes the spring and moves, the lip seal is spaced apart from the second stepped portion, and the communication groove is disposed toward the second stepped side so that the inflow passage and the discharge passage communicate with each other through the orifice. Can be.

In addition, a spring support groove may be formed at the other end of the plunger so that the spring is stably supported.

In addition, the spring retainer may be formed with a spring support protrusion so that the spring is stably supported.

In addition, a coupling groove is formed on one end side outer circumferential surface of the valve housing so that the spring retainer may be cocked to the coupling groove.

The filter member may further include a filter member coupled to the other end of the open both ends of the valve housing to filter foreign matters of the oil flowing into the inflow passage.

The cap may further include a cap that closes the bore and is fixed to the modulator block.

Check valve according to an embodiment of the present invention can be installed without position restrictions to perform the backflow prevention function in accordance with the pre-processed hydraulic circuit has the effect of improving the degree of freedom of design.

In addition, it is possible to provide a large flow rate required depending on the environment and driving conditions.

In addition, behavior stability and reactivity can be improved by guiding the movement of the plunger and controlling the flow of oil.

The present invention will be described in detail with reference to the following drawings, but these drawings illustrate preferred embodiments of the present invention, and thus the technical spirit of the present invention should not be construed as being limited to the drawings.
1 is an exploded perspective view illustrating a state in which a check valve is assembled to a modulator block according to an embodiment of the present invention.
2 is an assembled perspective view of FIG. 1.
3 is a bottom perspective view illustrating a plunger provided in a check valve according to an embodiment of the present invention.
4 is a cross-sectional view illustrating a check valve according to an exemplary embodiment of the present invention.
5 is a view showing an operating state of the check valve according to an embodiment of the present invention.
6 is a cross-sectional view showing a check valve according to another 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 is an exploded perspective view showing a state in which a check valve is assembled to a modulator block according to an embodiment of the present invention, FIG. 2 is an assembled perspective view of FIG. 1, and FIG. 3 is a check valve according to an embodiment of the present invention. 4 is a cross-sectional view illustrating a check valve according to an exemplary embodiment of the present invention.

1 to 4, the check valve 100 according to an aspect of the present invention may be mounted to a bore 13 having an inflow passage 11 and a discharge passage 12 formed in the modulator block 10. have. At this time, the check valve 100 is composed of an assembly assembled from the outside is mounted to the bore 13, the cap 170 for closing the bore 13 is separated from the assembly is mounted to close the bore separately. This is because the check valve 100 according to an aspect of the present invention is installed without changing the structure according to the positions of the inflow passage 11 and the discharge passage 12 previously formed, so as to improve the degree of freedom of design, for the installation structure This will be described again below.

The check valve 100 includes a valve housing 110, a plunger 120, a lip seal 130, and a spring retainer 150, and is installed in the bore 13 formed in the modulator block 10 to prevent backflow of oil. To prevent oil from flowing in one direction.

The valve housing 110 has a cylindrical shape in which both upper and lower ends are open, and a center is penetrated in the longitudinal direction to form an orifice 111. The orifice 111 communicates with the inflow passage 11 and the discharge passage 12 formed in the modulator block 10. In addition, a flange portion 114 protruding along the outer circumferential surface of the valve housing 110 to be fixed to the bore 13 is provided and stacked on the bore 13. That is, the valve housing 110 is fixed by entering the valve housing 110 into the bore 13 and deforming the modulator block 10 having the flange portion 114 to cover the flange portion 114. .

In addition, as shown in the drawings, the coupling groove 115 for coupling with the spring retainer 150 to be described later is formed on the outer peripheral surface of the valve housing 114 above the flange portion 114.

Orifice 111 may be opened and closed by the plunger 120 to be described later, it is formed stepped in the longitudinal direction. As shown in the drawing, the orifice 111 protrudes toward the center to support the plunger 120 and the second stepped portion 113 formed to contact the lip seal 130 installed on the plunger 120. ). At this time, the second stepped portion 113 is formed to have an inclined stepped surface of a tapered shape so that the diameter of the orifice 111 is expanded.

The plunger 120 is installed to slide upward and downward in the valve housing 110, and a communication groove 121 is formed to selectively communicate the inflow passage 11 and the discharge passage 12 according to the lifting movement. .

More specifically, one end of the plunger 120 is supported by the first step part 112 to close the orifice 111 and serves to guide the plunger 120 when the plunger 120 moves. At least one communication groove 121 communicating with the inflow passage 11 through the orifice 111 in the radial direction with respect to the center may be formed at one end of the plunger 120. That is, one end of the lower surface of the plunger 120 is supported in contact with the first step portion 112 except for the communication groove 121.

In addition, the other end of the plunger 120 is elastically supported by the spring 140. At this time, the upper end of the plunger 120 is provided with a spring support groove 124 to support the lower portion of the spring 140. Thus, the plunger 120 may be provided to be elastically supported in the direction of the first stepped part 112.

In addition, a lip seal 130 is installed on the outer circumferential surface of the plunger 120. As shown, the lip seal 130 is installed in the mounting groove 123 recessed inward from the outer peripheral surface of the plunger 120. The lip seal 130 includes a ring-shaped body portion 131 installed in the mounting groove 123, and a lip portion 133 formed to be inclined to have a predetermined angle in an outward direction from the body portion 131. The lip portion 133 is provided to contact the second stepped portion 113. That is, the lip part 133 is in surface contact with the stepped surface of the second stepped part 113 to have an inclination angle to correspond to the tapered shape of the second stepped part 113. Thus, it serves to prevent oil from flowing back from the discharge passage 12 toward the inflow passage 11.

As the plunger 120 pressurizes the spring 130 and moves upward, the lip seal 130 moves together with the lip part 133 spaced apart from the second step portion 113, and one end of the plunger 120. As the second step portion 113 moves toward the side, the orifice 111 is opened through the communication groove 121. Thus, the flow of oil from the inflow passage 11 to the discharge passage 12 is allowed.

The spring retainer 150 is coupled to one end of both open ends of the valve housing 110 proximate the discharge passage 12. As shown, the spring retainer 150 is coupled to the upper side of the valve housing 110. The spring retainer 150 is formed with a discharge port 152 in communication with the discharge passage 12. In addition, the spring retainer 150 is provided with a spring support protrusion 154 on the inner upper portion to support the upper end of the spring 140 for elastically pressing the plunger 120.

On the other hand, the spring retainer 150 is provided to surround the outer peripheral surface of the upper side of the valve housing 110 is cocked and coupled to the coupling groove 115 formed in the valve housing 110.

On the other hand, the filter member 160 for filtering foreign matter contained in the oil flowing through the inflow passage 11 may be coupled to the other end side, that is, the lower side of the open both ends of the valve housing (110).

As described above, the valve housing 110, the plunger 120, the lip seal 130, the spring retainer 150, and the filter member 160 may be installed in the bore 13 as an assembly formed from the outside. This assembly is assembled to the bore 13 and then coupled to close the bore 13 through the cap 170. That is, the cap 170 is separated from the assembly and coupled to close the inlet of the bore 13.

The assembly of the cap 170 and the assembly is to selectively install the assembly according to the installation position of the inflow passage 11 and the discharge passage 12 formed in the modulator block 10. For example, an assembly installed between the inflow passage 11 and the discharge passage 12 may have a plunger at one end of the valve housing 110 proximate the discharge passage 12 based on the flange portion 114 of the valve housing 110. The spring retainer 150 may be disposed to elastically support the 120, and the filter member 160 may be disposed at the other end of the valve housing 110 adjacent to the inflow passage 11 so that the spring retainer 150 may be installed in the bore 13. have. That is, although the embodiment illustrated in FIGS. 1 to 5 is illustrated and described as the inflow passage 11 is formed at the lower side and the discharge passage 12 is formed at the upper side, the inflow passage 11 'is disposed at the upper side and discharged. The structure of the check valve 100 'installed in the bore 13 of the modulator block 10, in which the flow path 12' is formed, is shown in FIG. 6 is a cross-sectional view showing a check valve according to another embodiment of the present invention. Here, the same reference numerals as in the above-described drawings indicate members having the same function.

As shown in FIG. 6, in the check valve 100 ′ according to another aspect of the present invention, an inflow passage 11 ′ formed in the modulator block 10 is located above the bore 13, and a discharge passage 12 ') Is located below the bore 13. Accordingly, the spring retainer 150 is disposed to elastically support the plunger 120 at the lower end side of the valve housing 110, and the filter member 160 is disposed at the upper end side of the valve housing 110 so that the check valve ( 100 ') is installed in the bore 13. Accordingly, as shown in FIGS. 3 and 5, even if the positions where the inflow passages 11 and 11 'and the discharge passages 12 and 12' are formed are changed, the flange portion 114 of the valve housing 110 according to the formation structure of the flow passage. By assembling to have a 180 ° phase difference on the basis of), it is possible to easily apply without changing the structure of the check valve (100, 100 ') separately. Thus, when designing the hydraulic circuit of the existing modulator block can solve the problem of processing the flow path according to the position of the check valve it is possible to improve the design freedom.

4 and 5, the operation state of the check valve 100 according to an aspect of the present invention will be described.

First, as shown in FIG. 5, when oil is introduced into the bore 13 through the inflow passage 11, the plunger 120 compresses the spring 140 when the pressure of the oil is greater than the elastic force of the spring 140. And move upward. Accordingly, the lip seal 130 installed on the outer circumferential surface of the plunger 120 is spaced apart from the second stepped portion 113, and one end of the plunger 120 is guided by the orifice 111 and from the first stepped portion 112. Spaced apart. At this time, the orifice 111 is opened by the communication groove 121 as the communication groove 121 formed at one end of the plunger 120 moves to be disposed toward the second step portion 113 side. Therefore, the oil introduced through the inflow passage 11 flows to the discharge passage 12 through the orifice 111 and the communication groove 121.

Next, when the pressure of the oil is less than the elastic force of the spring 150, as shown in Figure 4, the plunger 120 is returned to its original position by the elastic restoring force of the spring 140, the first step portion 112 ) And the lip 133 is brought into close contact with the second step 113 to perform a sealing function to prevent backflow of oil.

As described above, although the present invention has been described by way of limited embodiments and drawings, the present invention is not limited thereto and is intended by those skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of equivalents of the claims to be described.

10: modulator block 11, 11 ': inflow passage
12, 12 ': discharge flow path 13: bore
100, 100 ': check valve 110: valve housing
111: orifice 114: flange
120: plunger 121: communication groove
130: lip seal 140: spring
150: spring retainer 152: outlet
160: filter member 170: cap

Claims (11)

In the check valve installed in the bore of the modulator block having the inflow passage and the discharge passage to control the one-way flow of oil,
A valve housing having an orifice formed through a center thereof so that upper and lower ends thereof open to communicate with the inflow passage and the discharge passage, and a flange portion protruding around an outer surface to be fixed to the bore;
A spring retainer coupled to one end of an open end of the valve housing adjacent to the discharge passage and having a discharge port communicating with the discharge passage;
A plunger elastically supported by a spring supported by the spring retainer so as to move up and down in the orifice with the orifice closed, and having a communication groove for opening and closing the orifice according to the lifting up and down movement; And
And a lip seal coupled to a mounting groove formed on an outer circumferential surface of the plunger so as to move together with the plunger and in contact with the orifice and having a lip portion configured to allow flow of oil from the inflow passage to the discharge passage. The method of claim 1,
The valve housing is provided to have a first stepped portion protruding toward the center side to support the plunger in the longitudinally formed orifice, and a second stepped portion formed in contact with the lip portion,
And the second stepped portion has a tapered stepped surface. The method of claim 2,
The plunger is disposed in the orifice so that one end is supported on the first stepped portion to guide the movement of the plunger and the other end is elastically supported by the spring,
One end of the plunger check valve is formed with at least one communication groove in communication with the inflow passage in the radial direction relative to the center. The method of claim 2,
When the plunger pressurizes the spring and moves, the lip seal is spaced apart from the second stepped portion, and the communication groove is disposed toward the second stepped portion so that the inflow passage and the discharge passage communicate with each other through the orifice. . The method of claim 3,
The other end of the plunger check valve is formed with a spring support groove so that the spring is stably supported. The method of claim 1,
The spring retainer is a check valve is formed with a spring support projection so that the spring is stably supported. The method of claim 1,
One end side outer peripheral surface of the valve housing is formed with a coupling groove check valve that the spring retainer is cocked to the coupling groove. The method of claim 1,
Check valve further comprises a filter member coupled to the other end of the open both ends of the valve housing to filter foreign matter of the oil flowing into the inflow passage. The method of claim 1,
And a cap that closes the bore and is secured to the modulator block.
The method of claim 2,
The lip seal includes a ring-shaped body portion installed in the mounting groove,
The lip portion is formed to be inclined at a predetermined angle outward from the body portion in contact with the second stepped portion. The method of claim 10,
And the lip portion is pressed against the step surface of the second stepped portion by the pressure from the discharge passage toward the inflow passage to prevent backflow of oil.

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