KR20190108749A - Check valve - Google Patents

Abstract

Disclosed is a check valve capable of stably allowing and blocking a flow of a braking fluid. According to an embodiment of the present invention, the check valve is installed in a bore of a modulator block with an inlet flow path and an outlet flow path to control a flow of a braking fluid in one direction, and comprises: a valve housing including an orifice penetrated to communicate with the inlet flow path and the outlet flow path, a seat unit protruding into the orifice, and a retainer groove dented on the seat unit; a cap to close the bore and support one side of an elastic member; a plunger which supports the other side of the elastic member, is arranged to be moved into the orifice by elastic deformation of the elastic member, and has a flange unit protruding along an outer circumferential surface thereof to face the seat unit; and a sealing member which is accommodated in the retainer groove, blocks a flow of the braking fluid by coming in contact with the flange unit, and allows a flow of the braking fluid from the inlet flow path towards the outlet flow path by separation from the flange unit.

Description

Check Valve {CHECK VALVE}

The present invention relates to a check valve, and more particularly to a check valve applicable to an 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 the 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 is provided to supply pressure to a wheel cylinder by receiving a driver's braking intention as an electric signal from a pedal displacement sensor that detects a displacement of the brake pedal by the driver stepping on the brake pedal.

A general electronic brake system is configured such that a hydraulic pressure supply device receives an electrical signal corresponding to a foot pedal of a brake pedal to operate a motor to generate a braking pressure. 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 to control the flow of the braking fluid such as brake 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, in the conventional check valve, a large number of component elements may be applied, thereby lowering the assembly and productivity of the product, and there is a concern that the manufacturing cost of the product may increase due to the complicated structure.

Therefore, there is a need for a research on a check valve that can reduce the number of components to improve the assembly and productivity of the product, and to reduce the manufacturing cost of the product as a simple structure, while promoting the performance and operation reliability of the product.

Republic of Korea Patent Publication No. 10-2013-0092045 (published Aug. 20, 2013)

The present embodiment is to provide a check valve that can stably allow and block the flow of the braking fluid in various operating environments and driving conditions.

The present embodiment is to provide a check valve that can be made of a small number of components and a simple structure to improve the assembly and productivity of the product.

The present embodiment is to provide a check valve that can be made of a small number of component elements and a simple structure to reduce the manufacturing cost of the product.

The present embodiment is to provide a check valve that can improve the design freedom of the brake system and at the same time reduce the size of the product.

According to an aspect of the present invention, the check valve is installed in the bore of the modulator block having an inlet flow passage and an outlet flow passage to control the one-way flow of the braking fluid, it is formed through the communication with the inflow passage and the discharge passage A valve housing having an orifice, a seat portion protruding inwardly of the orifice, and a retainer groove recessed in the seat portion; A cap for closing the bore and supporting one side of the elastic member; A plunger supporting the other side of the elastic member and provided to be movable inside the orifice by elastic deformation of the elastic member, protruding along an outer circumferential surface and having a flange portion facing the sheet portion; A sealing member accommodated in the retainer groove and blocking the flow of the braking fluid by contact with the flange portion, and allowing a flow of the braking fluid from the inflow passage to the discharge passage by being spaced from the flange portion; It may be provided including.

The sealing member may include a main body mounted on the retainer groove, and a lip protruding from the main body toward the flange.

The cap may include a first support part formed to surround a portion of one side of the elastic member to support the cap, and the plunger may include a second support part protruding to be inserted into and support the other inner circumferential surface of the elastic member.

And a filter member provided at the side end of the inflow passage of the valve housing to filter foreign substances contained in the braking fluid.

The plunger may include at least one slot formed along the longitudinal direction on an outer circumferential surface of the plunger to allow the braking fluid to pass therethrough.

The valve housing may have at least one outlet port formed to communicate with the orifice and the discharge passage.

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 a braking fluid, the check valve being formed to communicate with the inflow passage and the discharge passage, and into the orifice. A valve housing including a protruding seat portion and a first step portion and a second step portion which are gradually stepped toward the outside on the outer circumferential surface of the seat portion; A cap for closing the bore and supporting one side of the elastic member; A plunger supporting the other side of the elastic member and provided to be movable inside the orifice by elastic deformation of the elastic member, protruding along an outer circumferential surface and having a flange portion facing the sheet portion; An outlet filter member provided at a side end of the discharge passage of the valve housing so as to filter foreign substances contained in the braking fluid or prevent foreign substances from being introduced thereto, and being coupled to the second stepped portion; It is accommodated in the retainer groove formed between the outer circumferential surface of the first stepped portion and the inner circumferential surface of the outlet filter member, and blocks the flow of the braking fluid by the contact with the flange portion, the inflow by the spaced apart from the flange portion It may be provided with a; sealing member for allowing the flow of the braking fluid from the flow path toward the discharge passage.

The valve housing may include a release preventing protrusion protruding from the first step portion toward the retainer groove to prevent the sealing member from being separated.

The sealing member may include a main body mounted on the retainer groove, and a lip protruding from the main body toward the flange.

The cap may include a first support part formed to surround a portion of one side of the elastic member to support the cap, and the plunger may include a second support part protruding to be inserted into and support the other inner circumferential surface of the elastic member.

And an inlet filter member provided at a side end of the inflow passage of the valve housing to filter out foreign substances contained in the braking fluid or prevent inflow of foreign substances.

The plunger may include at least one slot formed along the longitudinal direction on an outer circumferential surface of the plunger to allow the braking fluid to pass therethrough.

The outlet filter member may have one end inner circumferential surface in close contact with the outer circumferential surface of the second stepped portion, and the other end side inner circumferential surface in close contact with the outer circumferential surface of the first support portion.

The check valve according to the present embodiment can stably allow and block the flow of the braking fluid even in various operating environments and driving conditions, thereby improving product performance and reliability.

Check valve according to the present embodiment is made of a small number of components and a simple structure can be improved the assembly and productivity of the product.

Check valve according to the present embodiment is made of a small number of components and a simple structure can reduce the manufacturing cost of the product.

The check valve according to the present embodiment can reduce the size of the product can improve the design freedom of the brake system.

1 is a perspective view illustrating a check valve installed in a modulator block according to a first embodiment of the present invention.
2 is an exploded perspective view illustrating a state in which a check valve according to a first embodiment of the present invention is installed in a modulator block.
3 is a cross-sectional view showing a check valve according to a first embodiment of the present invention.
4 is a cross-sectional view showing an operating state of a check valve according to a first embodiment of the present invention.
5 is a cross-sectional view illustrating a check valve according to a second embodiment of the present invention.
6 is a cross-sectional view showing a check valve according to a modification of the second embodiment of the present invention.
7 is a cross-sectional view showing a check valve according to a third embodiment of the present invention.
8 is a cross-sectional view illustrating the operation of a check valve according to a third 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 a perspective view showing a state in which the check valve 100 according to the first embodiment of the present invention is installed in the modulator block 10, and FIG. 2 is a check valve 100 according to the first embodiment of the present invention. It is an exploded perspective view which shows the state installed in the block 10. FIG. 3 is a cross-sectional view showing a check valve 100 according to a first embodiment of the present invention.

1 to 3, the check valve 100 according to the first embodiment of the present invention includes an inflow passage 11 through which a braking fluid such as brake oil flows in, and a discharge passage through which the inflow braking fluid is discharged ( It may be provided in the bore (1) formed in the modulator block 10 having a 12). The check valve may be installed in the bore 1 of the modulator block 10 to operate only to allow the flow of the braking fluid in one direction from the inflow passage 11 to the discharge passage 12.

The check valve 100 according to the first embodiment of the present invention includes a valve housing 110 having an orifice 111 formed therethrough so as to communicate with the inflow passage 11 and the discharge passage 12, and the bore 1. The cap 120 supporting one side of the elastic member 180 such as a spring and the other side of the elastic member 180 and movable inside the orifice 111 by elastic deformation of the elastic member 180. The plunger 130 and the valve housing 110 and the plunger 130 is provided between the sealing member 150 for allowing and blocking the flow of the braking fluid and the foreign matter contained in the braking fluid to filter or It may include a filter member 160 to prevent inflow.

The valve housing 110 has a cylindrical shape penetrating in the longitudinal direction (up and down with reference to the drawing), and an orifice 111 having both ends open therein may be formed. In addition, the valve housing 110 includes a seat portion 112 protruding toward the inside of the orifice 111, a retainer groove 140 recessed in the seat portion 112, an orifice 111, and an outlet passage 12. ) May be provided with at least one outlet (115) penetrating through the side portion.

The seat portion 112 may be continuously protruded in the inner diameter direction of the orifice 111 to allow the plunger 130 and the sealing member 150 to be described later, and the retainer groove 140 may be a sealing member (to be described later) 150 may be recessed to be accommodated, but may be open toward the discharge channel 12 side or the upper side based on the drawing. The outlet 115 is provided to communicate the orifice 111 and the discharge passage 12, the braking fluid supplied from the inflow passage 11 to the orifice 111 is discharged to the outside from the orifice 111 to the discharge passage ( 12) can be supplied. For example, four outlets of the outlet 115 may be formed in the radial direction in the discharge passage 12 side of the valve housing 110, but the direction and number of the through holes may be variously changed according to design needs.

The cap 120 closes the bore 1 and is provided to support one side or the top of the elastic member 180 such as a spring to be described later. To this end, the cap 120 may include a binding jaw 125 protruding in an outer radial direction along an outer circumferential surface thereof, and a first support part 121 supporting one side of the elastic member 180. The binding jaw 125 may protrude along the outer circumferential surface so as to be inserted into the binding groove 15 formed in the inner circumferential surface of the bore 1, and the first support part 121 protrudes from the lower surface of the cap 120. The inner side may be formed in an empty cylindrical shape and may be supported by a structure surrounding a portion of one side of the elastic member 180.

The plunger 130 is accommodated inside the orifice 111 of the valve housing 110 and is provided to support the other side or the bottom of the elastic member 180 in the orifice 111 by elastic deformation of the elastic member 180. It is provided to be movable in the vertical direction. The plunger 130 has at least one slot 132 formed along the longitudinal direction on the outer circumferential surface thereof so as to allow the braking fluid to pass therethrough, and protrudes along the outer radial direction on the outer circumferential surface of the seat portion 112 of the valve housing 110. A flange portion 131 disposed to face each other and a second support portion 135 supporting the other side of the elastic member 180 may be provided.

The slot 132 may be recessed on the outer circumferential surface of the plunger 130 so that a braking fluid that passes from the inflow passage 11 to the discharge passage 12 may pass between the slot 132 and the orifice 111. . The flange portion 131 protrudes along the radial direction of the outer circumferential surface from the upper side of the slot 132 and is disposed to face the seat portion 112 of the valve housing 110, and the sealing member 150 accommodated in the retainer groove 140. ) Can be provided to be in contact with. The second support part 135 may be provided to protrude in the form of a cylinder on the upper surface of the plunger 130 so that a part is inserted into the other inner peripheral surface of the elastic member 180 to support the elastic member 180.

One side of the elastic member 180 may be supported by the first support part 121 of the cap 120, and the other side thereof may be supported by the second support part 135 of the plunger 130. The cap 120 is fixed to the modulator block 10 by the binding jaw 125, and the elastic member 180 elastically supports the plunger 130 on the other side to support the plunger 130 when compressed by elastic deformation. The flange portion 131 and the sealing member 150 may be spaced apart from each other by moving toward the discharge passage 12, and the flange portion 131 and the sealing member 150 may be moved by moving the plunger 130 toward the inflow passage 11 during expansion. ) May be in close contact. The elastic member 180 may be formed of a coil spring or the like, but is not limited thereto, and may be formed of various materials and structures as long as the elastic member 180 may elastically support the plunger 130.

The sealing member 150 is disposed between the seat portion 112 of the valve housing 110 and the flange portion 131 of the plunger 130 to provide sealing and unsealing of the valve housing 110 and the plunger 130. . The sealing member 150 may be mounted in the retainer groove 140 of the seat part 112 to be stably mounted to the valve housing 110 to prevent separation, and the sealing member 150 may be a retainer groove ( Block the flow of the braking fluid by contact with the body portion 151 and the flange portion 131 of the plunger 130 inserted into the 140 and the plan to allow the flow of the braking fluid by spaced apart from the flange portion 131 It may include a lip portion 152 protruding toward the branch portion 131. The sealing member 150 may block and allow the flow of the braking fluid by contacting and spaced apart from the flange portion 131 of the plunger 130 according to the movement of the plunger 130 due to the elastic deformation of the elastic member 180. have. Detailed description of the operation of these components will be described later with reference to FIG.

The filter member 160 is provided to filter foreign matter contained in the braking fluid or prevent inflow of foreign matter. The filter member 160 may be inserted into the filter step 118 formed in the orifice 111 on the inflow passage 11 side of the valve housing 110. The filter step 118 may be formed along the inner circumferential surface of the orifice 111 on the inflow passage 11, and the filter member 160 may be inserted into the filter step 118.

Hereinafter, an operation of the check valve 100 according to the first embodiment of the present invention will be described.

4 is a cross-sectional view showing an operating state of the check valve 100 according to the first embodiment of the present invention.

First, referring to FIG. 3, since the plunger 130 is provided to be elastically supported by the elastic member 180, the plunger 130 is usually mounted in the retainer groove 140 of the seat part 112 before operation. It is provided in close contact with the lip 152 of the member 150. At this time, even if the braking fluid is supplied from the inflow passage 11 to the bore 1 side, when the pressure of the braking fluid is smaller than the elastic force of the elastic member 180, the plunger 130 cannot move. Therefore, the plunger 130 is still in contact with the sealing member 150 to maintain the flow of the braking fluid is blocked. In addition, even when the braking fluid is supplied from the discharge passage 12 to the bore 1 side, the braking fluid is directed toward the inflow passage 11 because the elastic support direction of the plunger 130 by the elastic member 180 coincides with the flow direction of the braking fluid. The flow of fluid is not acceptable.

After that, when the pressure of the braking fluid increases and becomes greater than the elastic force of the elastic member 180, as shown in FIG. 4, the plunger 130 pressurized by the braking fluid moves while compressing the elastic member 180. In addition, the flange 131 of the plunger 130 also moves together so that the flange 131 is spaced apart from the sealing member 150. As a result, the inflow passage 11, the slot 132 of the plunger 130, and the discharge passage 12 communicate with each other so that the braking fluid introduced from the inflow passage 11 is bore 1, the slot 132, and the outlet 115. As it is sequentially discharged to the discharge passage 12, the flow of the braking fluid may be allowed.

After that, when the pressure of the braking fluid decreases to become smaller than the elastic force of the elastic member 180 or the supply of the braking fluid from the inflow passage 11 is stopped, the plunger is returned to its original position by the elastic restoring force of the elastic member 180. When the flange 131 and the lip 152 of the sealing member 150 are brought into close contact with each other, the flow of the braking fluid is blocked so that the braking fluid can prevent the reverse flow.

Hereinafter, the check valve 200 according to the second embodiment of the present invention will be described.

5 is a cross-sectional view showing a check valve 200 according to a second embodiment of the present invention, Figure 6 is a cross-sectional view showing a check valve 300 according to a modification of the second embodiment of the present invention.

Referring to FIG. 5, the check valve 200 according to the second embodiment of the present invention includes a valve housing 210 having an orifice 211 formed therethrough so as to communicate with the inflow passage 11 and the light discharge passage 12. And the cap 120 for closing the bore 1 and supporting one side of the elastic member 180, such as a spring, and the other side of the elastic member 180, and being orifice by elastic deformation of the elastic member 180. 211) a plunger 130 provided to be movable inside, a sealing member 250 disposed between the valve housing 210 and the plunger 130 to allow and block the flow of the braking fluid, and the braking fluid contained in the braking fluid. It may include a filter member for filtering foreign matter or preventing the inflow of foreign matter.

In the following description of the check valve 200 according to the second embodiment of the present invention will be described in addition to the check valve 100 according to the first embodiment of the present invention. The description is the same as that of the description, and the description is omitted to prevent duplication of contents.

The valve housing 210 according to the second embodiment of the present invention may have a cylindrical shape penetrating in the longitudinal direction (up and down with reference to the drawing), and an orifice 211 having both ends open therein may be formed. The valve housing 210 includes a seat portion 212 protruding radially along the inner circumferential surface of the orifice 211, a first step portion 213 formed stepwise along the outer circumferential surface of the seat portion 212, and a seat. The second stepped part 214 may be formed along the outer surface of the part 212, and may be stepped on the outside of the first stepped part 213.

The seat portion 212 may be formed to protrude in the inner diameter direction of the orifice 211 to allow the plunger 130 and the sealing member 250 to be described later, and the first stepped portion 213 and the second stepped portion ( 214 may be formed to gradually step outward on the discharge passage 12 side of the seat portion 212, respectively. In other words, the first stepped portion 213 is formed to be stepped inside the second stepped portion 214 at the upper end of the sheet portion 212 based on the drawing, and the second stepped portion 214 is the sheet portion 212. It is formed to be stepped outward from the first stepped portion 213 at the upper end of the). The second step portion 214 may be in close contact with the inner circumferential surface of the outlet filter member 270 to be described later, so that the valve housing 210 and the outlet filter member 270 may be coupled to each other, A space between the inner circumferential surface of the combined outlet filter member 270 and the first stepped portion 213 may form a retainer groove 240 so that the sealing member 250 may be seated. The retainer groove 240 may be formed to accommodate the sealing member 250 to be described later, but may be open toward the discharge channel 12 side or the upper side based on the drawing.

The sealing member 250 is a retainer groove 240 formed in a space between the inner circumferential surface of the outlet filter member 270 coupled to the second step portion 214 of the valve housing 210 and the outer circumferential surface of the first step portion 213. It is seated in the valve housing 210 and the plunger 130 is provided to seal and unsealed. The sealing member 250 is accommodated in the retainer groove 240 to block the flow of the braking fluid by contacting the body portion 251 and the flange portion 131 of the plunger 130 mounted on the seat portion 212. In addition, the flange 131 may include a lip portion 252 to allow the flow of the braking fluid by the spaced apart. The sealing member 250 may block and allow the flow of the braking fluid by contacting and spaced apart from the flange portion 131 of the plunger 130 according to the movement of the plunger 130 due to the elastic deformation of the elastic member 180. have.

The filter member is provided to filter out foreign substances contained in the braking fluid or prevent inflow of foreign substances. The filter member includes an inlet filter member 260 provided at the inflow passage 11 side of the valve housing 210 and an outlet filter member 270 provided at the discharge passage 12 side of the valve housing 210. . The inlet filter member 260 may be inserted into the filter step 118 formed in the orifice 211 on the inflow passage 11 side of the valve housing 210. The filter step 118 may be stepped along the inner circumferential surface at the inflow passage 11 side of the orifice 211, and the filter member may be inserted into the filter step 118. The outlet filter member 270 may be coupled to the second stepped part 214 formed stepped on the outermost side of the seat part 212 of the valve housing 210. The outlet filter member 270 has one end inner circumferential surface and the outer circumferential surface of the second stepped portion 214 closely adhered to each other and is coupled to the valve housing 210, and the other end inner circumferential surface and the outer circumferential surface of the first support portion 121 are closely adhered to each other. By binding to 120 can be fixedly installed. The outlet filter member 270 may be provided in a hollow cylindrical shape, and may have a discharge port 275 formed through the outer surface to communicate the inside and the outside but having a filter installed to filter out the foreign matter. For example, the outlet 275 may be formed with four groups penetrating in the radial direction on the outer surface of the outlet filter member 270, but the penetrating direction and number may be changed in various ways depending on the design needs.

Hereinafter, an operation of the check valve 200 according to the second embodiment of the present invention will be described.

First, as shown in FIG. 5, since the plunger 130 is provided to be elastically supported by the elastic member 180, the plunger 130 is usually the seat portion 212 and the outlet filter member 270 before or during operation. It is provided in close contact with the lip portion 252 of the sealing member 250 mounted in the retainer groove 240 therebetween. At this time, even if the braking fluid is supplied from the inflow passage 11 to the bore 1 side, when the pressure of the braking fluid is smaller than the elastic force of the elastic member 180, the plunger 130 cannot move. Therefore, the plunger 130 is still in contact with the sealing member 250 to maintain the flow of the braking fluid is blocked. In addition, even when the braking fluid is supplied from the discharge passage 12 to the bore 1 side, the braking fluid is directed toward the inflow passage 11 because the elastic support direction of the plunger 130 by the elastic member 180 coincides with the flow direction of the braking fluid. The flow of fluid is not acceptable.

After that, when the pressure of the braking fluid increases and becomes greater than the elasticity of the elastic member 180, the plunger 130 pressurized by the braking fluid moves while compressing the elastic member 180, and the flange portion of the plunger 130 is moved. 131 also moves together so that the flange 131 is spaced apart from the sealing member 250. As a result, the inflow passage 11, the slot 132 of the plunger 130, and the discharge passage 12 communicate with each other so that the braking fluid introduced from the inflow passage 11 is bore 1, the slot 132, and the outlet 275. As it is sequentially discharged to the discharge passage 12, the flow of the braking fluid may be allowed.

After that, when the pressure of the braking fluid decreases to become smaller than the elastic force of the elastic member 180 or the supply of the braking fluid from the inflow passage 11 is stopped, the plunger is returned to its original position by the elastic restoring force of the elastic member 180. When the flange 131 and the lip 252 of the sealing member 250 are brought into close contact with each other, the flow of the braking fluid is blocked so that the braking fluid can prevent backflow.

Hereinafter, a check valve 300 according to a modification of the second embodiment of the present invention will be described.

Referring to FIG. 6, the valve housing 210 may further include a departure preventing protrusion 315 protruding from the first step portion 213 toward the retainer groove 240.

The anti-separation protrusion 315 is formed to protrude in the outer radial direction along the outer circumferential surface of the first stepped portion 213, thereby preventing the detachment of the sealing member 250 seated in the retainer groove 240. In general, the sealing member 250 is made of a material having an elastic property for stable sealing, the separation preventing protrusion 315 by additionally pressing the body portion 251 side of the sealing member 250, sealing member 250 ) Is stably seated in the retainer groove 240, and can be prevented from being separated from the retainer groove 240.

Hereinafter, the check valve 400 according to the third embodiment of the present invention will be described.

7 is a cross-sectional view illustrating a check valve according to a third embodiment of the present invention. Referring to FIG. 7, the check valve 400 according to the third embodiment of the present invention includes an inflow passage 11 and a discharge passage 12. A valve housing 410 having an orifice 411 penetrated so as to communicate with the cap, a cap 420 on which the bore 1 is closed and the valve housing 410 is mounted, and movable inside the orifice 411. A plunger 430 and a sealing member 450 supporting one side of the elastic member 180 and disposed between the valve housing 410 and the plunger 430 to allow and block the flow of the braking fluid, and an elastic member. It may include a filter member 460 to support the other side of the 180 and to filter foreign matter contained in the braking fluid or to prevent the inflow of foreign matter.

In the following description of the check valve 400 according to the third embodiment of the present invention described below, except for the additional reference numerals, the check valve 100 according to the first embodiment of the present invention will be described. The description is the same as that of the description, and the description is omitted to prevent duplication of contents.

The valve housing 410 may have a cylindrical shape penetrating in the longitudinal direction (up and down with reference to the drawing) to form an orifice 411 having both ends open. In addition, the valve housing 410 includes a seat portion 412 forming the orifice 411, a first support portion 413 formed on the outside of the seat portion 412 and mounted with a filter member 460 to be described later. The filter part 414 formed in the flow path 11 side may be provided.

The seat 412 is provided along the circumferential direction of the orifice 411 to be in contact with the plunger 430 and the sealing member 450 which will be described later, and the filter member 460 which will be described later on the inner circumferential surface of the first support 413. In close contact with the outer circumferential surface of the filter member 460 can be mounted to the valve housing 410. In addition, the filter unit 414 may be provided at the inflow passage 11 to filter out foreign substances contained in the braking fluid or prevent inflow of foreign substances.

The cap 420 may be provided to close the bore 1 and to be coupled with the valve housing 410. To this end, the cap 420 may include a binding jaw 425 protruding in an outer radial direction along an outer circumferential surface thereof, and a second support 421 to which one side of the valve housing 410 is inserted and coupled. The binding jaw 425 may protrude along the outer circumferential surface so as to be inserted into the binding groove 15 formed in the inner circumferential surface of the bore 1, and the second support 421 may protrude from the lower surface of the cap 420. Since the inside is formed in a hollow cylindrical shape, the outer circumferential surface of the valve housing 410 comes into close contact with the inner circumferential surface of the second support part 421, so that the cap 420 and the valve housing 410 may be coupled to each other.

The plunger 430 is accommodated inside the orifice 411 of the valve housing 410, and is provided to support one side or the top of the elastic member 180 through the sealing member 450 to be described later. It is provided so that a movement to an up-down direction is possible from the inside of the orifice 411 by a deformation | transformation. The plunger 430 is inserted into the orifice 411, the body portion 431 is formed with at least one slot 432 formed in the longitudinal direction on the outer circumferential surface to allow the braking fluid to pass through, and the lower end of the body portion 431 It may be provided with a flange portion 433 is formed to be extended to the outside to face the seat portion 412 of the valve housing 410 and the sealing member 450 is wrapped.

The slot 432 is recessed in the outer circumferential surface of the body portion 431 of the plunger 430 so that a braking fluid that passes from the inflow passage 11 to the discharge passage 12 may pass between the slot 432 and the orifice 411. It can be arranged to be. The flange portion 433 is formed to extend from the lower end of the body portion 431 and is disposed to face the seat portion 412 of the valve housing 410, and the sealing member 450 may be formed to surround the outer surface. On the outer circumferential surface of the flange portion 433, a binding groove 434 is formed to be recessed for stable coupling with the sealing member 450, the sealing member 450 has a shape corresponding to the shape of the binding groove 434 The binding protrusion 452 may be formed to protrude from the inside.

The sealing member 450 is disposed between the seat portion 412 of the valve housing 410 and the flange portion 433 of the plunger 430, and is provided to seal and unseal the valve housing 410 and the plunger 430. . Sealing member 450 may be formed to surround the outer surface of the flange portion 433 of the plunger 430, the lower end is provided with a third support portion 451 for supporting the elastic member 180, the inner flange portion ( A binding protrusion 452 protruded to be inserted into the binding groove 434 of the 433 may be provided. The third support part 451 is recessed at a position where the sealing member 450 and the elastic member 180 face each other, and the binding protrusion 452 protrudes in a shape corresponding to the binding groove 434 of the flange portion 433. By being formed, the plunger 430 and the sealing member 450 may be firmly coupled to each other. The sealing member 450 moves together with the plunger 430 by the elastic deformation of the elastic member 180 to block and permit the flow of the braking fluid by contacting and spaced apart from the seat 412 of the valve housing 410. can do. Detailed description of the operation of these components will be described later with reference to FIG.

One side of the elastic member 180 may be supported by the third support part 451 of the sealing member 450, and the other side may be supported by the fourth support part 461 of the filter member 460 which will be described later. The filter member 460 is fixedly installed on the inner side of the bore 1, the elastic member 180 moves the sealing member 450 and the plunger 430 toward the discharge passage 12 when compressed by elastic deformation, and thus the plan is moved. The branch portion 433 and the sealing member 450 may be spaced apart to allow the flow of the braking fluid, and during expansion, the sealing member 450 and the plunger 430 may be moved toward the inflow passage 11 to expand the flange portion 433. The sealing member 450 may be in close contact with each other to block the flow of the braking fluid. The elastic member 180 may be formed of a coil spring or the like, but is not limited thereto, and may be formed of various materials and structures as long as the elastic member 180 may elastically support the plunger 430 and the sealing member 450.

The filter member 460 is provided to filter out foreign substances contained in the braking fluid or prevent inflow of foreign substances. The filter member 460 may filter foreign substances contained in the braking fluid by allowing the braking fluid introduced inward to flow to the discharge passage 12 through the filters formed on the side and bottom of the body. In addition, the filter member 460 is provided with a fourth support part 461 for supporting the other side of the elastic member 180, and a plurality of interval maintaining to form a gap between the bore 1 and the filter member 460 formed on the bottom surface The protrusion 462 may be provided. The fourth support part 461 may be formed to be stepped to support the other side or the bottom of the elastic member 180, and the plurality of gap maintaining protrusions 462 may be braked through a filter formed on the bottom surface of the filter member 460. In order to smoothly flow the fluid, a predetermined gap may be formed between the filter member 460 and the bottom of the bore 1.

Hereinafter, the operation of the check valve 400 according to the third embodiment of the present invention will be described.

8 is a cross-sectional view showing an operating state of the check valve 400 according to the third embodiment of the present invention.

First, referring to FIG. 7, since the plunger 430 and the sealing member 450 are elastically supported by the elastic member 180, the sealing member 450 closely adheres to the seat 412 of the valve housing 410. It is prepared. At this time, even when the braking fluid is supplied from the inflow passage 11 to the bore 1 side, the plunger 430 and the sealing member 450 may not move when the pressure of the braking fluid is smaller than the elastic force of the elastic member 180. Therefore, the sealing member 450 is in contact with the seat portion 412 and maintains the flow of the braking fluid is blocked. In addition, even when the braking fluid is supplied from the discharge passage 12 to the bore 1 side, the inflow flow path of the plunger 430 and the sealing member 450 by the elastic member 180 coincides with the flow direction of the braking fluid. (11) The flow of braking fluid towards the side is not permitted.

After that, when the pressure of the braking fluid increases and becomes greater than the elastic force of the elastic member 180, as shown in FIG. 8, the plunger 430 pressurized by the braking fluid moves while compressing the elastic member 180. The plunger 430 and the sealing member 450 move to separate the sealing member 450 from the seat part 412. As a result, the inflow passage 11, the slot 432 of the plunger 430, and the discharge passage 12 communicate with each other so that the braking fluid introduced from the inflow passage 11 is bore 1, the slot 432, and the filter member 460. By sequentially passing through) to the discharge passage 12 may be allowed to flow of the braking fluid.

After that, when the pressure of the braking fluid decreases to become smaller than the elastic force of the elastic member 180 or the supply of the braking fluid is stopped from the inflow passage 11, the plunger 430 and the sealing member 450 are elastic members 180. It is returned to its original position by the elastic restoring force of the flange, and the flange portion 433 and the sealing member 450 are brought into close contact with the seat portion 412 again so that the flow of the braking fluid is blocked so that the braking fluid can prevent the reverse flow. Can be.

10: Modulator Block 11: Inflow Channel
12: discharge flow path 100, 200, 300, 400: check valve
110, 210, 410: valve housing 111, 211, 411: orifice
112, 212, 412: Seat part 120, 420: Cap
130, 430: Plunger 131, 431: Flange
140, 240: retainer groove 150, 250, 450: sealing member
151, 251: body portion 152, 252: lip portion
160 and 460: filter member 213: first stepped portion
214: second stepped portion 260: inlet filter member
270: outlet filter member 315: separation prevention projections

Claims (13)

In the check valve which is installed in the bore of the modulator block having the inflow passage and the discharge passage to control the one-way flow of the braking fluid,
A valve housing having an orifice penetrating through the inflow passage and the discharge passage, a seat portion protruding inwardly of the orifice, and a retainer groove recessed in the seat portion;
A cap for closing the bore and supporting one side of the elastic member;
A plunger supporting the other side of the elastic member and provided to be movable inside the orifice by elastic deformation of the elastic member, protruding along an outer circumferential surface and having a flange portion facing the sheet portion; And
A sealing member accommodated in the retainer groove and blocking the flow of the braking fluid by contact with the flange portion, and allowing a flow of the braking fluid from the inflow passage to the discharge passage by being spaced from the flange portion; Check valve comprising a. The method of claim 1,
The sealing member
And a lip portion protruding from the body portion to the flange portion, the body portion being mounted to the retainer groove. The method of claim 2,
The cap is
A first support part formed and supported to surround a portion of one side of the elastic member,
The plunger
And a second support part protruding to be inserted into and supported on the other inner circumferential surface of the elastic member. The method of claim 3,
And a filter member provided at the end of the inflow passage side of the valve housing to filter out foreign substances contained in the braking fluid or prevent foreign substances from entering. The method of claim 4, wherein
The plunger
A check valve having at least one slot formed in the longitudinal direction on the outer circumferential surface of the brake fluid to pass through. The method of claim 5,
The valve housing
And a check valve having at least one outlet port formed to communicate with the orifice and the discharge passage. In the check valve which is installed in the bore of the modulator block having the inflow passage and the discharge passage to control the one-way flow of the braking fluid,
An orifice penetratingly formed to communicate with the inflow passage and the discharge passage, a sheet portion protruding inwardly of the orifice, and a first step portion and a step formed gradually toward the outside on the outer circumferential surface of the sheet portion; A valve housing having a two stepped portion;
A cap for closing the bore and supporting one side of the elastic member;
A plunger supporting the other side of the elastic member and provided to be movable inside the orifice by elastic deformation of the elastic member, protruding along an outer circumferential surface and having a flange portion facing the sheet portion;
An outlet filter member provided at a side end of the discharge passage of the valve housing so as to filter foreign substances contained in the braking fluid or prevent foreign substances from being introduced thereto, and being coupled to the second stepped portion; And
It is accommodated in the retainer groove formed between the outer circumferential surface of the first stepped portion and the inner circumferential surface of the outlet filter member, and blocks the flow of the braking fluid by the contact with the flange portion, the inflow by the spaced apart from the flange portion And a sealing member for allowing a flow of the braking fluid from the flow passage toward the discharge passage. The method of claim 7, wherein
The valve housing
And a release preventing protrusion protruding from the first stepped portion toward the retainer groove to prevent the sealing member from being separated. The method of claim 8,
The sealing member
And a lip portion protruding from the body portion to the flange portion, the body portion being mounted to the retainer groove. The method of claim 9,
The cap is
A first support part formed and supported to surround a portion of one side of the elastic member,
The plunger
And a second support part protruding to be inserted into and supported on the other inner circumferential surface of the elastic member. The method of claim 10,
And an inlet filter member disposed at an end portion of the inflow passage side of the valve housing to filter foreign substances contained in the braking fluid or prevent foreign substances from entering. The method of claim 11,
The plunger
A check valve having at least one slot formed in the longitudinal direction on the outer circumferential surface of the brake fluid to pass through. The method of claim 12,
The outlet filter member
One side inner peripheral surface is in close contact with the outer peripheral surface of the second stepped portion, the other end side inner peripheral surface is in close contact with the outer peripheral surface of the first support portion is coupled to the check valve.

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