WO2020106109A1

WO2020106109A1 - Check valve and brake system including same

Info

Publication number: WO2020106109A1
Application number: PCT/KR2019/016172
Authority: WO
Inventors: 전인욱
Original assignee: 주식회사 만도
Priority date: 2018-11-23
Filing date: 2019-11-22
Publication date: 2020-05-28
Also published as: KR20200060955A

Abstract

A check valve and a brake system including same are disclosed. A check valve, according to an embodiment of the present invention, comprises: a valve housing having a flow path penetrating the inside thereof; a first ball valve part provided at one side of the flow path; and a second ball valve part provided at the other side of the flow path, wherein the first ball valve part can include: a ball opened and closed by selectively coming in contact with an orifice provided at the flow path; an elastic member of which one side is elastically supported by the ball; and a cap elastically supported by the other side of the elastic member and fixedly coupled to the valve housing, and the second ball valve part can include: an elastic member of which one side is elastically supported inside the flow path; a ball elastically supported by the other side of the elastic member; and a seat which has a seat hole opened and closed by the ball selectively coming in contact with same and which is fixedly coupled to the valve housing. In addition, the check valve including a first ball valve and a second ball valve is provided at a flow path for connecting a fluid pressure supply device and a hydraulic control device in the brake system, so as to selectively transmit the fluid pressure of the fluid pressure supply device to a first hydraulic circuit or a second hydraulic circuit.

Description

Check valve and brake system including same

The present invention relates to a check valve and a brake system, and more particularly, to a check valve used in a vehicle brake system.

In general, the brake system is to effectively prevent slippage of the wheel, which may occur during braking, sudden oscillation, or rapid acceleration of the vehicle.

The brake system is equipped with a plurality of solenoid valves that control the braking hydraulic pressure transmitted from the master cylinder to the wheel cylinder side, and a plurality of check valves to prevent the reverse flow of oil, installed in a modulator block where a flow path of the hydraulic circuit is formed inside. Control the braking hydraulic pressure.

The conventional brake system uses the vacuum booster to supply the braking pressure to the wheel cylinder when the driver presses the brake pedal, but recently, when the driver presses the brake pedal, the driver's willingness to brake is applied from the pedal displacement sensor that senses the displacement of the brake pedal. Electronic brake systems having a hydraulic pressure supply device that receives a signal and supplies braking pressure to a wheel cylinder are widely used.

An example of the electronic brake system is Korean Patent Publication No. 10-2013-0092045. According to the disclosed document, 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 effort. At this time, the braking pressure is generated by converting the rotational force of the motor into linear motion and pressing the piston.

In addition, in the electronic brake system, a plurality of check valves are installed at various locations in the flow path formed in the modulator block in order to control the flow of oil in one direction. In one example, the check valve is installed in a flow path connecting the hydraulic pressure supply device and the reservoir, a distribution flow path of the wheel cylinder, a simulator connection flow path, and the like.

The check valve is equipped with a valve housing, a ball provided in the valve housing to open and close the oil passage, an elastic member for elastically supporting the ball, and a retainer or stopper member to prevent the elastic member from coming off, so that the oil is unidirectional. It is configured to flow only.

Conventional check valves are not easy to manufacture because each part has to be manufactured through a process molding and press method, and the processing cost is high accordingly. In addition, since the check valve is separately installed in the vehicle's modulator block, a forced indentation process is separately required, so it is difficult to manage because precise mounting is required to reduce defects due to misassembly.

According to an embodiment of the present invention, a pair of check valves are integrally formed, and the present invention is to provide a check valve having a simplified structure and a brake system including the same.

According to an aspect of the present invention, there is provided a check valve including a valve housing having a flow passage through the inside, a first ball valve portion provided on one side of the flow path, and a second ball valve portion provided on the other side of the flow path. Can be.

In addition, at least one of the first ball valve portion and the second ball valve portion is a ball that is selectively opened and closed by contact with the orifice provided in the flow path, an elastic member having one side elastically supported on the ball, and the elastic member Elastically supported on the other side and may include a cap fixedly coupled to the valve housing, and the cap may include a plurality of cap holes.

In addition, at least one of the first ball valve portion and the second ball valve portion is an elastic member having one side elastically supported inside the flow path, a ball elastically supported on the other side of the elastic member, and the ball selectively contacting It may include a seat having an opening and closing seat hole and fixedly coupled to the valve housing.

According to another aspect of the present invention, a valve housing in which an inlet flow path through which a fluid flows in and an outlet flow path flowing out are provided therein, a first ball valve portion provided in the outlet flow path, and a second provided in the inlet flow path A check valve including a ball valve portion may be provided.

In addition, the inlet flow path includes a first inlet flow path provided in one of the width direction and the longitudinal direction of the valve housing, and a second inlet flow path provided in the other direction, and the second ball valve unit includes first and second It may be provided in at least one of the inlet flow path.

In addition, the inlet flow path is provided in the width direction and / or the longitudinal direction of the valve housing, the first ball valve portion and the first ball to be opened and closed by selectively contacting the orifice provided in the outlet flow path, the first A first elastic member having one side elastically supported on the ball and a cap elastically supported on the other side of the first elastic member and fixedly coupled to the valve housing may be included.

In addition, the inlet flow path includes a first inlet flow path provided in the width direction of the valve housing and a second inlet flow path provided in the longitudinal direction, and the second ball valve part is provided in at least one of the first and second inlet flow paths. Can be prepared.

In addition, the inlet flow path and the outlet flow path may be provided in 3way.

In addition, the second ball valve unit is a second elastic member elastically supported on one side inside the inlet flow path, a second ball elastically supported on the other side of the second elastic member, and the second ball is selectively contacted to open and close. It may include a seat having a seat surface to be fixedly coupled to the valve housing.

In addition, the outlet passage provided with the first ball valve part and the inlet passage provided with the second ball valve part may be arranged in a straight direction in the valve housing.

According to another aspect of the invention, the check valve provided as described above; A reservoir in which oil is stored; A master cylinder connected to the reservoir and having a master chamber and a piston to discharge oil according to the effort of the brake pedal; A hydraulic pressure supply device operating by an electrical signal to generate a hydraulic pressure; Includes; a hydraulic control device having a first hydraulic circuit and a second hydraulic circuit to transfer the hydraulic pressure discharged from the hydraulic pressure supply device to a wheel cylinder provided on each of the two wheels, and the check valve includes a hydraulic pressure supply device and a hydraulic control device A brake system that is installed in a flow path connecting the hydraulic fluid supply device to selectively transmit the hydraulic pressure to the first hydraulic circuit or the second hydraulic circuit may be provided.

The check valve according to the embodiment of the present invention and the brake system including the same, because two check valves are assembled to one valve housing, manufacturing cost is reduced due to a decrease in the number of parts, and assembly work is easy, so product mass productivity is improved. It can be greatly improved.

In addition, since the check valve according to the embodiment of the present invention has a simplified structure, it can be manufactured by forging a low-cost construction method, thereby reducing component costs, and when applied to a brake system of a vehicle, the installation space limitation of the check valve in the modulated block Can be solved to improve design freedom.

1 is a view illustrating an example of a brake system of a vehicle in which a check valve is used according to an embodiment of the present invention.

2 is an enlarged cross-sectional view of a part of the flow path provided in the brake system of a vehicle in which a check valve is used according to an embodiment of the present invention.

3 is a combined perspective view showing a check valve according to a first embodiment of the present invention.

4 is an exploded perspective view showing a check valve according to a first embodiment of the present invention.

5 is a cross-sectional view showing a check valve according to a first embodiment of the present invention.

6 is a view schematically showing a flow path through which a check valve according to a second embodiment of the present invention can be provided.

7 is a cross-sectional view showing a check valve according to a second embodiment of the present invention.

8 is a view schematically showing a flow path through which a check valve according to a third embodiment of the present invention can be provided.

9 is a cross-sectional view showing a check valve according to a third embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms or words used in the present specification and claims should not be construed as being limited to ordinary or lexical meanings, and the inventor appropriately explains the concept of terms in order to explain his or her invention in the best way. Based on the principle that it can be defined, it should be interpreted as meanings and concepts consistent with the technical spirit of the present invention. Therefore, the embodiments shown in the embodiments and the drawings described in this specification are only the most preferred embodiments of the present invention and do not represent all of the technical spirit of the present invention, and at the time of this application, various alternatives are possible. It should be understood that there may be equivalents and variations.

1 is a hydraulic circuit diagram for an electronic brake system of a vehicle provided with a check valve according to an embodiment of the present invention. In this embodiment, an electronic brake system is exemplified as an example, but the present invention is not limited thereto, and the check valve according to the present embodiment may be appropriately modified and applied to a brake system using a booster as well as other electronic brake systems having changed flow paths. Can be.

Referring to the drawings, the electronic brake system according to the present embodiment includes a master cylinder 20 for generating hydraulic pressure, a reservoir 30 coupled to an upper portion of the master cylinder 20 to store oil, and a brake pedal 10 The input rod 12 that presses the master cylinder 20 according to the effort of the wheel, the wheel cylinder 40 which performs the braking of each wheel (RR, RL, FR, FL) by transmitting hydraulic pressure, and the brake pedal 10 ) Is provided with a pedal displacement sensor (11) that detects the displacement of the brake and a simulation device (50) that provides a reaction force according to the pedal effort of the brake pedal (10).

The master cylinder 20 is provided to constitute at least one chamber to generate hydraulic pressure. In one example, the master cylinder 20 may include a first master chamber 20a and a second master chamber 20b as shown. The first master chamber 20a is provided with a first piston 21 connected to the input rod 12, and the second master chamber 20b is provided with a second piston 22. A first spring 21a is provided between the first piston 21 and the second piston 22, and a second spring 22a is provided between the second piston 22 and the end of the master cylinder 20. Can be.

The reservoir 30 may be connected to the master cylinder 20 and the wheel cylinder 40 and the simulation device 50 through a plurality of flow paths. In addition, the reservoir 31 includes three

reservoir chambers

31, 32, and 33, which are partitioned therein, as shown, and connected to the master cylinder 20, the wheel cylinder 40, the simulation device 50, and the like, respectively. Can be.

The simulation device 50 includes a simulation chamber 51 for storing oil discharged from the master cylinder 20, a reaction force piston 52 provided in the simulation chamber 51, and a reaction force spring 53 elastically supporting the same It may include a pedal simulator and a simulator valve 54 provided at the rear end of the simulation chamber 51. The simulator valve 53 may be composed of a closed solenoid valve that maintains a normally closed state, and is connected to the reservoir 30. In addition, a simulator check valve 55 is provided in parallel to the simulator valve 54 to connect the simulator chamber 51 and the reservoir 30.

In addition, the electronic brake system according to the present embodiment receives a brake intention of the driver as an electrical signal from a pedal displacement sensor 11 that detects the displacement of the brake pedal 10, and a hydraulic pressure supply device 60 that mechanically operates, Hydraulic control device consisting of a first hydraulic circuit 71 and a second hydraulic circuit 72 for controlling the flow of hydraulic pressure transmitted to the wheel cylinder 40 provided on each of the two wheels RR, RL, FR, FL, respectively. (70) may be included. These

devices

60 and 70 can be effectively controlled by an electronic control unit of a vehicle not shown.

The hydraulic pressure supply device 60 provides oil pressure delivered to the wheel cylinder 40. In more detail, when the driver presses the brake pedal 10, an electric signal is transmitted from the pedal displacement sensor 11, and the motor 61 of the hydraulic pressure supply device is operated by the signal. Between the motor 61 and the piston 62 including the rotor 61a and the stator 61b, a worm wheel 65a and a worm shaft 65b, which convert the rotational motion of the motor into a linear motion, or a rack and pinion gear, etc. A power conversion unit 65 made may be provided.

In addition, the hydraulic pressure supply device 60 includes a cylinder block 63 provided with a pressure chamber for receiving and storing oil from the reservoir 30, and a piston 62 accommodated in the cylinder block 63. The pressure chamber is divided into a first pressure chamber (63a) and a second pressure chamber (63b) by the piston 62 reciprocating the cylinder block 63, the volume is changed according to the movement of the piston (62).

The first pressure chamber (63a) is connected to the wheel cylinder 40 by the first hydraulic flow path 64, the second pressure chamber (63b) is connected to the wheel cylinder 40 by the second hydraulic flow path (65) do. In addition, the first pressure chamber (63a) is connected to the reservoir 30 by the first dump flow path 66, the second pressure chamber (63b) is connected to the reservoir 30 by the second dump flow path (67) do. A check valve or a check valve and a solenoid valve may be provided on the first dump passage 66 and the second dump passage 67, respectively.

The hydraulic control device 70 includes a plurality of valves that receive hydraulic pressure with the force generated by the hydraulic pressure supply device 60 and control the wheel braking operation. For example, the hydraulic control device 70 includes a first hydraulic circuit 71 that controls the right front wheel FR and a left rear wheel RL, and a second hydraulic pressure that controls the left front wheel FL and the right rear wheel RR. Circuit 72 may be included. The first and second

hydraulic circuits

71 and 72 are provided at the front end of each wheel cylinder 40 and branched between a plurality of inlet valves 73a to 73d for controlling the hydraulic pressure, and the inlet valve and the wheel cylinder 40, and a reservoir. It may include a plurality of outlet valves (74a ~ 74d) connected to (30). A plurality of check valves 75a to 75d may be provided in the bypass flow path connecting the front and rear of the inlet valves 73a to 73d.

In addition, in the flow path connecting the

hydraulic circuits

71 and 72 of the hydraulic control device 70 and the hydraulic control device 70, the hydraulic pressure of the hydraulic pressure supply device 60 is applied to the first hydraulic circuit 71 or A plurality of switching

valves

81, 82, 83, 84, 85, and 86, which are selectively delivered to the second hydraulic circuit 72, may be provided. In this embodiment, the plurality of switching valves 81 to 86 are shown as one-way check valves provided to transmit liquid pressure only from the hydraulic pressure supply device 60 to the wheel cylinder 40, but are not limited thereto and are electrically controlled by the electronic control unit. The solenoid valve may be provided so that the opening / closing operation can be controlled, or the check valve and the solenoid valve may be mixed and provided on the flow path.

Reference numerals 91 and 92, which are not described, are a first backup flow path 91 and a second backup flow path 92 that directly connect the master cylinder 20 and the wheel cylinder 40 when the electronic brake system fails. The backup passages 91 and 92 may be provided with first and

second cut valves

93 and 94 in the form of solenoid valves.

In addition, an unexplained reference numeral "PS1" is a hydraulic flow pressure sensor that senses the hydraulic pressure of the first or second

hydraulic circuits

71 and 72, and "PS2" is a backup that measures the oil pressure of the master cylinder 20. It is a flow path pressure sensor, and "MPS" is a motor control sensor that controls the rotation angle of the motor 61 or the current of the motor.

Figure 2 is a cross-sectional view showing a state in which a check valve according to an embodiment of the present invention is installed in a part of the flow path of the modulator block (see II in FIG. 1). As shown, the check valve according to the present embodiment is installed in place where two existing one-

way check valves

85 and 86 are provided to construct a

3way flow path

87,88,89 in the modulator block, thereby installing space It can solve the shortage and reduce the manufacturing cost and reduce the assembly process by reducing the number of parts due to the simple structure.

3 is a combined perspective view showing a check valve according to a first embodiment of the present invention, FIG. 4 is an exploded perspective view showing a check valve according to this embodiment, and FIG. 5 is a check valve along the AA line of FIG. 3 It is a cross-sectional view of.

Referring to the drawings, the check valve 100 according to the first embodiment includes a valve housing 110 having a passage through the inside, a first ball valve unit 120 provided at both ends of the passage, and a second It may include a ball valve unit 130.

The valve housing 110 includes a body 111 provided in a cylindrical shape, and flow

paths

113 and 115 penetrating through the interior of the body 111.

The body 111 is made of a metal material, and the external and internal shapes of the body can be processed by a forging method or the like. A circumference of both ends in the longitudinal direction of the body 111 protrudes outward than the center side, and a press-in part 112 processed in a surface shape may be provided. The press-fitting portion 112 is tightly coupled to a bore-shaped flow path formed in a modulator block (not shown) to partition the flow path inside and outside based on the press-fit portion.

The flow path may include a first flow path 113 provided in the width direction of the body 111 and a second flow path 115 provided in the longitudinal direction.

The first flow path 113 is provided in the radial direction of the cylindrical body 111. At least one of the first flow paths 113 may be provided on the body 111, and when a plurality are provided, they may penetrate the body in the radial direction and communicate with each other.

The second flow path 115 is provided to penetrate the central portion in the longitudinal direction of the cylindrical body 111, and the first flow path 113 is easy to install the first ball valve portion 120 and the second ball valve portion 130. ) Diameter may be relatively larger.

As shown in FIG. 5, the second flow path 115 may have a stepped inner diameter to form an orifice therein. For example, as illustrated, the second flow path 115 formed perpendicularly to the first flow path 113 has a smaller inner diameter than the outer side of the central side proximate to the first flow path 113 to provide an orifice on the path. have.

Looking more specifically, the second flow path 115 includes a small path 115a in a straight form from inside to an outside, a valve surface 115b in a sloped form, and a large path 115c in a straight form. The small path 115a is in direct communication with the first flow path 113, the valve surface 115b forms an orifice, and the first valve portion 120 and / or the valve surface 115b and the large path 115c. Alternatively, the second valve unit 130 may be installed. Hereinafter, for convenience of explanation, the second flow path 115 is the second flow path 115A provided on one side, and the second flow path 115B provided on the other side, centered on the first flow path 113. To distinguish.

The first ball valve unit 120 may be provided in the 2-1 flow path 115A. The first ball valve unit 120 is elastically pressurized on one side of the first ball 121 and the first ball 121 as an opening and closing member that selectively contacts the orifice provided in the 2-1 flow path 115A. It includes a first elastic member 122 in the form of a supported coil spring, and a cap 123 coupled to an end of the 2-1 flow path 115A and the other side of the first elastic member 122 is elastically pressed and supported. can do.

The first ball 121 is provided to selectively contact the inclined valve surface 115b of the 2-1 flow path 115A from the large path 115c to the small path 115a, and the first elastic member ( 122) is provided to press the first ball 121 from the large path (115c) to the small path (115a), the cap 123 is the first elastic member 122 at the end of the large path (115c) side Elastically pressurized. In this embodiment, the ball is illustrated as an example of a member that selectively opens or closes an orifice, but the present invention is not limited thereto and may be provided in various other forms such as a semicircle, an arc, and the like.

The cap 123 includes a support portion 124 provided on the center side and a plurality of cap holes 125 provided around the support portion 124 to stably support the first elastic member 122 as shown. It can contain. The support part 124 may be provided to protrude in the form of a cone or a hemisphere, and the plurality of cap holes 125 may be arranged in a radial form around the support part 124.

Since the first ball valve unit 120 provided as described above allows the fluid to flow from the inside of the valve housing body 111 to the outside, but does not flow in the opposite direction, the first flow path in the first embodiment 113 may be used as an inlet flow path of the fluid, and the 2-1 flow path 115A may be used as an outlet flow path of the fluid.

Meanwhile, the second ball valve unit 130 may be provided in the 2-2 flow path 115B. The 2-2 flow path 115B has an inner path 115a and a large path 115c from the center inner side of the valve housing body 111, similar to the 2-1 flow path 115A, and connects between them. It includes a photo guide surface 115d.

The second ball valve unit 130 is elastically supported on one side of the second ball 131 and on the inner small path 115a of the 2-2 flow path 115B, and the other side elastically supports the second ball 131. It may include a second elastic member 132 in the form of a coil spring, and a seat 133 having an orifice coupled to an end of the 2-2 flow path 115B and the second ball 131 selectively contacting and opening and closing. have.

In order to facilitate the support of the second elastic member 132, a stepped jaw may be provided in the small path 115a of the 2-2 flow path 115B. The seat 133 includes a seat surface 134 provided in an arc shape so that the second ball 131 is selectively contacted and opened on the inside as shown, and a fluid passes through the center of the seat surface 134. A sheet hole 135 to be provided is provided.

Since the second ball valve unit 130 provided as described above only allows the fluid to flow from the outside of the valve housing body 111 to the inside, and does not flow in the opposite direction, the second ball valve unit 130 is second to second in the first embodiment. The second flow path 115B may be used as the inlet flow path of the fluid together with the first flow path 113.

Accordingly, the check valve 100 according to the first embodiment of the present invention is a first block flow path connected to the first flow path 113 of the three-

way flow paths

87, 88, and 89 provided in the modulator block as shown in FIG. 87), and the fluid flows through the third block flow path 89 provided with the second ball valve unit 130, and the fluid flows through the second block flow path 88 provided with the first ball valve unit 120. You will get out.

6 and 7 are a simplified hydraulic circuit diagram having a flow path through which a check valve according to a second embodiment of the present invention can be installed and a combined sectional view showing the check valve. The check valve according to the second embodiment is mainly described in terms of differences from the check valve according to the first embodiment, and the same reference numerals as the first embodiment perform the same functions, and thus detailed descriptions are omitted.

The check valve 100 'according to the second embodiment includes a cylinder-shaped body 111, a first flow path 113 provided in the width direction of the body 111, and a second flow path 115 provided in the longitudinal direction. Including the valve housing 110 having the same as the first embodiment, but the 2-1 flow path 115A and 2-2 flow path 115B, respectively, the 1-1 valve unit 120A and the second It is different from the first embodiment that the 1-2 valve portion 120B is provided.

Both the first-first valve portion 120A and the first-second valve portion 120B have the same configuration having the first ball 121, the first elastic member 122, and the cap 123.

However, the 1-1 valve part 120A and the 1-2 valve part 120B are in the form of an outlet that allows fluid to flow from inside to outside of the valve housing body 111 and blocks the opposite flow. Since it is a valve, in this embodiment, the first flow path 113 is required as an inlet flow path so that the fluid can flow into the valve housing body 111.

Accordingly, the fluid flows through the first block flow path 87 of the modulated block into the first flow path 113 provided on the center side in the width direction of the valve housing, and then the 2-1 flow path provided in the longitudinal direction of the valve housing. The direction of the second block flow path 88 and the third block flow path 89 through the first-first valve portion 120A of 115A and the first-second valve portion 120B of the second-second flow path 115B With each spill.

That is, the check valve 100 ′ according to the second embodiment is in both directions of the longitudinal second flow path 115 where both ends are opened after fluid flows from the first flow path 113 in the width direction of the valve housing 110. It forms an internal flow path of the 'T' shape through which the fluid flows.

8 and 9 are a simplified hydraulic circuit diagram having a flow path through which a check valve according to a third embodiment of the present invention can be installed, and a combined sectional view showing the check valve. The check valve according to the third embodiment is mainly described in terms of differences from the check valve according to the first and second embodiments, and the same reference numerals as the first and second embodiments perform the same function, and thus detailed description is omitted. do.

The check valve 100 "according to the third embodiment includes a cylinder-shaped body 111, a first flow path 113 provided in the width direction of the body 111, and a second flow path 115 provided in the longitudinal direction. Including the valve housing 110 having the same as the first and second embodiments, but the 2-1 valve section 130A respectively in the 2-1 flow path 115A and the 2-2 flow path 115B, respectively And the 2-2 valve unit 130B are different from the first embodiment.

Both the 2-1 valve portion 130A and the 2-2 valve portion 130B have the same configuration with the second ball 131, the second elastic member 132, and the seat 133.

However, the 2-1 valve unit 130A and the 2-2 valve unit 130B are inlet-type in which fluid allows flow from the outside of the valve housing body 111 to the inside and blocks the opposite flow. Because it is a valve, in this embodiment, the first flow path 113 is required as an outlet flow path so that the fluid can flow out of the valve housing body 111.

Therefore, the fluid is the second block flow path 88 and the third block flow path 89 of the modulated block and the second-first valve section 130A of the second-first flow path 115A provided in the longitudinal direction of the valve housing. After flowing into the valve housing through the 2-2 valve portion 120B of the 2-2 flow path 115B, the first block flow path 87 is passed through the first flow path 113 provided at the center of the width direction. ).

That is, the check valve 100 "according to the third embodiment is the first flow path in the width direction after the fluid flows in both directions from the

second flow paths

115A and 115B in the longitudinal direction where both ends of the valve housing 110 are opened. (113) to form an internal flow path in the form of a 'T' in which the fluid flows.

As described above, in the above embodiment, two ball valves, for example, a first ball valve part and a second ball valve part are provided one by one inside the valve housing (first embodiment) or two first ball valve parts are provided (product) Embodiment 2) or the configuration in which two second ball valve parts are provided (the third embodiment) is illustrated, but the present invention is not limited thereto and may be provided in various forms through appropriate modifications and modifications. For example, the internal flow path of the valve housing may be provided in an 'T' shape as well as an 'l' or '+' shape, and the valve housing may also be provided with 'a', 'T', '+' It can be modified and modified in the form of a back.

Claims

A valve housing having a passage through the inside,

A first ball valve portion provided on one side of the flow path,

Check valve including a second ball valve portion provided on the other side of the flow path.
According to claim 1,

At least one of the first ball valve portion and the second ball valve portion

A ball that selectively contacts and opens and closes the orifice provided in the flow path,

An elastic member having one side elastically supported on the ball,

Check valve including a cap that is elastically supported on the other side of the elastic member and fixedly coupled to the valve housing.
According to claim 2,

The cap is a check valve comprising a plurality of cap holes.
According to claim 1,

At least one of the first ball valve portion and the second ball valve portion

An elastic member having one side elastically supported inside the flow path,

A ball elastically supported on the other side of the elastic member,

A check valve including a seat having a seat hole which is opened and closed by selectively contacting the ball and fixedly coupled to the valve housing.
A valve housing through which an inlet flow path through which the fluid flows in and an outlet flow path outflow through the inside,

A first ball valve part provided in the outlet passage,

A check valve including a second ball valve portion provided in the inlet flow path.
The method of claim 5,

The inlet flow path includes a first inlet flow path provided in one of the width direction and the longitudinal direction of the valve housing, and a second inlet flow path provided in the other direction,

The second ball valve portion is a check valve provided on at least one of the first and second inlet passages.
The method of claim 5,

The inlet flow path is provided in the width direction and / or the longitudinal direction of the valve housing,

The first ball valve unit

A first ball that selectively opens and closes an orifice provided in the outlet passage,

A first elastic member having one side elastically supported on the first ball,

Check valve including a cap that is elastically supported on the other side of the first elastic member and fixedly coupled to the valve housing.
The method of claim 7,

The inlet flow path includes a first inlet flow path provided in the width direction of the valve housing and a second inlet flow path provided in the longitudinal direction,

The second ball valve portion is a check valve provided on at least one of the first and second inlet passages.
The method of claim 8,

The inlet flow path and the outlet flow path are three-way check valves.
The method of claim 5,

The second ball valve unit

A second elastic member having one side elastically supported inside the inlet passage,

A second ball elastically supported on the other side of the second elastic member,

A check valve including a seat having a seat surface that the second ball selectively contacts to open and close and fixedly coupled to the valve housing.
The method of claim 5,

An outlet flow path provided with the first ball valve portion and an inlet flow path provided with the second ball valve portion are arranged in a straight line in the valve housing.
A check valve provided by any one of claims 1 to 11;

A reservoir in which oil is stored;

A master cylinder connected to the reservoir and having a master chamber and a piston to discharge oil according to the effort of the brake pedal;

A hydraulic pressure supply device operating by an electrical signal to generate a hydraulic pressure;

It includes; a hydraulic control device having a first hydraulic circuit and a second hydraulic circuit to transfer the hydraulic pressure discharged from the hydraulic pressure supply device to the wheel cylinder provided on each of the two wheels;

The check valve is installed in a flow path connecting the hydraulic pressure supply device and the hydraulic control device, a brake system for selectively transmitting the hydraulic pressure of the hydraulic pressure supply device to the first hydraulic circuit or the second hydraulic circuit.