KR102037080B1 - Check valve - Google Patents

Abstract

The 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 a guide hole 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 provided to be movable up and down in the guide hole while being elastically supported by a spring supported by the spring retainer and having a communication hole for selectively communicating the inflow passage and the discharge passage according to the elevation movement; And a lip seal coupled to the mounting groove formed in the guide hole, the lip seal being in contact with the plunger to allow the 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 for efficiently preventing wheel slippage that may occur during braking, rapid start, or rapid acceleration of a vehicle, and includes a plurality of solenoid valves for controlling braking hydraulic pressure transmitted from a master cylinder to a 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 having a hydraulic pressure supply device for supplying pressure to a wheel cylinder by receiving a driver's braking intention as an electrical signal from a pedal displacement sensor that detects a displacement of the brake pedal while the driver steps 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 according to the pedal pedal's pedaling force. 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 flow of the required flow rate according to the environment and running conditions.

According to an aspect of the present invention, a check valve installed in a bore of a modulator block having an inflow passage and an outlet passage to control one-way flow of oil, the guide hole communicating with the inflow passage and the discharge passage, and in the bore A valve housing having a flange portion protruding around the outer surface to be fixed; A plunger configured to move up and down in the guide hole in a state of being spaced apart without contact with the cap fixed to the modulator block and separating or communicating the inflow passage and the discharge passage according to the lifting movement; and the valve housing And a lip seal provided between the singer plunger and a lip portion configured to allow the flow of oil in one direction from the inflow passage to the discharge passage.
A spring retainer coupled to one end of both open ends of the valve housing while being spaced from the cap and having a discharge port communicating with the discharge flow path; And a spring provided between the spring retainer and the plunger.
The plunger may include a communication hole communicating the inflow passage and the discharge passage; A guide part disposed in the guide hole and having an internal flow path communicating with the inflow flow path; And a support part extending radially from the guide part to be elastically supported by the spring and supported on an open end side of the valve housing.
When the pressure of the oil flowing from the inflow passage to the discharge passage is low, the oil pressure deforms the lip to open the communication hole, and when the pressure of the oil is high, the plunger presses the spring to move the communication. The hole can be opened.
The support portion may be formed with a spring support groove so that the spring is stably supported.
The spring retainer may be formed with a spring support protrusion so that the spring is stably supported.
A coupling groove is formed at 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 matter of the oil flowing into the inflow passage.
It may further include a mounting groove provided in the guide hole for receiving the lip seal.
The communication hole may include a plurality of first communication holes formed around the side surface of the guide part so as to communicate with the inner flow path, and a plurality of second communication holes formed around the outer surface of the support part so as to communicate with the guide hole and the outlet. have.
After the valve housing enters the bore, a portion of the modulator block may be deformed to cover the flange portion to couple the valve housing to the bore.

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Check valve according to an embodiment of the present invention is installed to perform the function according to the processed hydraulic circuit without the position restriction has the effect of improving the degree of freedom of design.

In addition, it is possible to open and close the flow according to the environment and driving conditions to provide the required flow.

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 the technical concept of the present invention is not limited to the drawings and should not be interpreted.
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 cross-sectional view illustrating a check valve according to an exemplary embodiment of the present invention.
4 and 5 are views showing the operating state of the check valve according to an embodiment of the present invention, respectively.
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 illustrating a state in which a check valve is assembled to a modulator block, 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. It is sectional drawing to show.

1 to 3, 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 along the pre-formed inflow passage 11 and the discharge passage 12 to improve the degree of freedom of design, the installation structure will be described again below. Shall be.

The check valve 100 includes a valve housing 110, a lip seal 120, a spring retainer 140, and a plunger 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 a guide hole 111. The guide hole 111 communicates with the inflow passage 11 and the discharge passage 12 formed in the modulator block 10. In addition, the outer surface of the valve housing 110 is provided with a flange portion 113 protruding along the outer peripheral surface to be fixed to the bore 13 is assembled to the stacking (staking) to the bore (13). That is, the valve housing 110 is fixed by entering the valve housing 110 into the bore 13 and deforming the part of the modulator block 10 having the flange portion 113 to cover the flange portion 113. .

In addition, as shown in the drawing, a coupling groove 114 for coupling with the spring retainer 140 to be described later is formed on the outer circumferential surface of the valve housing 113 above the flange portion 113.

The lip seal 120 is installed in the valve housing 110. As shown, the lip seal 120 is installed in the mounting groove 112 recessed into the guide hole 111.

Lip seal 120 has a ring-shaped body portion 122 is installed in the mounting groove 112, and the lip portion 121 is formed to be inclined to have a predetermined angle from the body portion 122 toward the center side. The lip portion 121 is provided to be in contact with the plunger 150 to be described later, and serves to allow the flow of oil from the inflow passage 11 toward the discharge passage 12.

The spring retainer 140 is coupled to one end of both open ends of the valve housing 110 proximate the discharge passage 12. As shown, the spring retainer 140 is coupled to the upper side of the valve housing 110. The spring retainer 140 has a discharge port 142 in communication with the discharge passage 12 is formed. In addition, the spring retainer 140 is provided with a spring support protrusion 143 on the inner upper portion to support the upper end of the spring 130 to elastically pressurize the plunger 150.

On the other hand, the spring retainer 140 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 114 formed in the valve housing 110.

The plunger 150 is installed to slidably move up and down in the valve housing 110, and communication holes 153 and 156 selectively communicate with the inflow passage 11 and the discharge passage 12 in accordance with the lifting movement. ) Is formed. More specifically, the plunger 150 is disposed in the guide hole 111, the guide portion 151 is formed with an internal flow passage 152 communicating with the inflow passage 11, and extends in the radial direction from the guide portion 151 And a support part 155 and a communication hole 153 and 156 formed in the guide part 151 and the support part 155, respectively, which are formed and elastically supported by the spring 130 and are supported on the open end side of the valve housing 110. do. In this case, the communication holes 153 and 156 are divided into a first communication hole 153 formed in the guide part 151 and a second communication hole 156 formed in the support part 155.

The guide part 151 may be formed in a cylindrical shape having a long length up and down, and an inner flow passage 152 is formed from a bottom to an upward direction. A plurality of first communication holes 153 is formed around the side surface of the guide part 151 to communicate with the internal flow path 152. The guide part 151 is guided in the guide hole 111 when the plunger 150 moves up and down. In addition, a portion of the outer circumferential surface of the guide portion 151 is provided to be in contact with the lip portion 121 of the lip seal 120 can prevent the oil from flowing back from the discharge passage 12 to the inflow passage 11.

The support part 155 is formed integrally with the guide part 151 and extends radially from the guide part 151. The support part 155 is provided to be supported on the open end side, that is, the upper end side of the valve housing 110. A plurality of second communication holes 156 are formed around the outer surface of the support part 155. The second communication hole 156 is formed to communicate with the guide hole 111 and the outlet 142. In addition, the upper end of the support 155 is provided with a spring support groove 157 to support the lower portion of the spring 130. Thus, the plunger 150 may be provided in a state that is elastically supported toward 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 lip seal 120, the plunger 150, the spring retainer 140, 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 that is close to the discharge passage 12 based on the flange portion 113 of the valve housing 110. The spring retainer 140 may be disposed to elastically support the 150, and the filter member 160 may be disposed at the other end side of the valve housing 110 adjacent to the inflow passage 11 to be installed in the bore 13. have. That is, as shown in Figure 6, the check valve 100 'according to another aspect of the present invention is the inlet flow path 11' formed in the modulator block 10 is located above the bore 13, the discharge flow path When the 12 'is positioned below the bore 13, the spring retainer 140 is disposed to elastically support the plunger 150 at the lower end side of the valve housing 110, and the filter member 160 is disposed in the valve housing. It is installed on the bore 13 to be disposed on the upper end side of the (110). Therefore, as shown in FIGS. 3 and 6, even if the positions in which the inflow passages 11 and 11 ′ and the discharge passages 12 and 12 ′ are formed are changed, the flange portion 113 of the valve housing 110 depends on 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. Meanwhile, the same reference numerals in FIG. 6 and the same reference numerals in the above-described drawings indicate members having the same function, and detailed description thereof will be omitted.

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. 4, when oil is introduced into the bore 13 through the inflow passage 11, the plunger 150 is not moved when the pressure of the oil is smaller than the elastic force of the spring 130. At this time, the oil flows through the inner passage 152 and the first communication hole 153 of the plunger 150 and the lip portion 121 is elastically deformed as the lip portion 121 of the lip seal 120 is pressed. Thus, the lip 121 is spaced apart from the plunger 150 so that the oil flows through the guide hole 111 and the second communication hole 156 and is discharged to the discharge passage 12 through the discharge port 142.

Next, when the pressure of the oil is greater than the elastic force of the spring 130, the plunger 150 compresses the spring 130 and moves upward. Accordingly, the first communication hole 153 of the plunger 150 is positioned above the lip seal 120 so that the first communication hole 153 communicates directly with the guide hole 111 and the outlet 142. Therefore, the oil introduced through the inflow passage 11 is discharged directly to the outlet 142 through the internal passage 152 and the first communication hole 153 to provide a large flow rate flow.

As described above, the check valve 100 according to an aspect of the present invention provides a flow rate of the oil by the low pressure and high pressure of the oil, as well as a large flow rate required according to the low temperature conditions or the speed of the vehicle, which is an external environmental factor. You can do it.

On the other hand, when the pressure of the oil discharged through the discharge passage 12 becomes smaller than the elastic force of the spring 130, as shown in Figure 3, the plunger 150 is returned to its original position by the elastic restoring force of the spring 130 As the lip 121 is brought into close contact with the plunger 150, the lip 121 performs 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: guide hole 113: flange portion
120: lip seal 121: lip portion
130: spring 140: spring retainer
142: outlet 150: plunger
151: guide portion 153: first communication hole
155: support portion 156: second communication hole
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 a guide hole communicating with the inflow passage and the discharge passage, and a flange portion protruding around an outer surface to be fixed to the bore;
A plunger configured to move up and down in the guide hole while closing the bore and spaced apart from contact with a cap fixed to the modulator block, and separating or communicating the inflow passage and the discharge passage according to the lifting movement; and
And a lip seal provided between the valve housing and the plunger and having a lip portion configured to allow oil to flow in one direction from the inflow passage to the discharge passage. The method of claim 1,
A spring retainer coupled to one end of both open ends of the valve housing while being spaced from the cap and having a discharge port communicating with the discharge flow path; And
And a spring provided between the spring retainer and the plunger. The method of claim 2,
The plunger,
A communication hole for communicating the inflow passage and the discharge passage;
A guide part disposed in the guide hole and having an internal flow path communicating with the inflow flow path; And
And a support part extending radially from the guide part and being elastically supported by the spring and supported on an open end side of the valve housing. The method of claim 3,
When the pressure of the oil flowing from the inflow passage to the discharge passage is low, the oil pressure deforms the lip to open the communication hole, and when the pressure of the oil is high, the plunger presses the spring to move the communication. Check valve to open the hole. The method of claim 3,
The support valve is a check valve formed with a spring support groove so that the spring is stably supported. The method of claim 2,
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 2,
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 2,
And a mounting groove provided in the guide hole to receive the lip seal. The method of claim 3,
The communication hole includes a plurality of first communication holes formed around the side surface of the guide part so as to communicate with the internal flow path, and a plurality of second communication holes formed around the outer surface of the support part so as to communicate with the guide hole and the outlet. Check valve. The method of claim 1,
And a valve to couple the valve housing to the bore by deforming the modulator block to cover the flange portion after the valve housing enters the bore.

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