Braking device for a vehicle

Abstract

This disclosure relates to a braking device for a vehicle, comprising: a three-way solenoid valve unit including one or more three-way solenoid valves; a valve block having a first surface, the three-way solenoid valve unit mounted on the first surface; at least one accumulator for storing working fluid; a pressurizing unit for pressurizing the working fluid; and a plurality of wheel cylinders for using the hydraulic pressure of the working fluid to limit the rotation of the wheels, wherein each three-way solenoid valve includes a first port, a second port, a third port, a first open / close flow path, and a second open / close flow path, the first open / close flow path allowing or preventing the first port and the second port from fluidly communicating with each other, the second open / close flow path allowing or preventing the second port and the third port from fluidly communicating with each other; and at least a portion of the at least one accumulator disposed between the three-way solenoid valve unit and the second surface of the valve block.

Description

[0001] Related applications

[0002] This application claims priority and benefits to Korean Patent Application No. 10-2021-0143005, filed on October 25, 2021, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0003] This disclosure relates to braking devices for vehicles. Background Technology

[0004] The content described herein is for background information only and does not constitute related technology.

[0005] Normally open solenoid valves open the flow path when no current is applied. Normally closed solenoid valves close the flow path when no current is applied. A vehicle's hydraulic braking system delivers working fluid to multiple wheel brake units by regulating the opening and closing states of each of these solenoid valves.

[0006] Figure 6 This is a simplified block diagram illustrating a conventional braking system used in vehicles.

[0007] refer to Figure 6 In the vehicle's hydraulic braking system, a normally open inlet valve 3 and a normally closed outlet valve 5 are installed. Working fluid is supplied from the braking device 1 to the inlet valve 3 and outlet valve 5. When the inlet valve 3 is open, the working fluid of the braking device 1 flows to the wheel cylinder, increasing the hydraulic pressure in the wheel cylinder. When the outlet valve 5 is open, the working fluid from the wheel cylinder is discharged back into the braking device 1, decreasing the hydraulic pressure in the wheel cylinder. Because this hydraulic braking system includes multiple solenoid valves, it suffers from high manufacturing costs. Furthermore, the volume of the valve block used to house the multiple solenoid valves inevitably increases. Summary of the Invention

[0008] This disclosure aims to provide a braking device for a vehicle, wherein a three-way solenoid valve is used as both an inlet valve and an outlet valve, thereby reducing the manufacturing cost and size of the hydraulic braking device.

[0009] The objectives to be addressed by this disclosure are not limited to those described above, and other objectives not described above will be clearly understood by those skilled in the art through the following description. Attached Figure Description

[0010] The above and other objects, features, and advantages of this disclosure will become more apparent to those skilled in the art from the accompanying drawings, which describe exemplary embodiments of the present disclosure in detail with reference to the drawings, in which:

[0011] Figure 1 This is a hydraulic circuit diagram illustrating a braking device for a vehicle according to an embodiment of the present disclosure;

[0012] Figure 2 This is a side view showing a braking device for a vehicle according to an embodiment of the present disclosure;

[0013] Figure 3 This is a front view showing a braking device for a vehicle according to an embodiment of the present disclosure;

[0014] Figure 4 This is a top view showing some components of a braking device for a vehicle according to an embodiment of the present disclosure;

[0015] Figure 5 This is a cross-sectional view showing a three-way solenoid valve according to an embodiment of the present disclosure; and

[0016] Figure 6 This is a simple block diagram illustrating a conventional braking device used in vehicles. Detailed Implementation

[0017] In this specification, the terms “left-hand side” / “right-hand side” or “upper” / “lower” are used only to indicate the orientation of the components shown in the figures and are not intended to limit the contents of this disclosure to their arrangement and position.

[0018] Figure 1 This is a hydraulic circuit diagram illustrating a braking device for a vehicle according to an embodiment of the present disclosure.

[0019] Figure 2 This is a side view showing a braking device for a vehicle according to an embodiment of the present disclosure.

[0020] Figure 3 This is a front view showing a braking device for a vehicle according to an embodiment of the present disclosure.

[0021] Figure 4 This is a top view showing some components of a braking device for a vehicle according to an embodiment of the present disclosure.

[0022] refer to Figures 1 to 4 According to one embodiment of the present disclosure, a braking device 100 for a vehicle includes all or some of the following: a three-way solenoid valve unit, a valve block 190, an accumulator, an oil reservoir 120, a pressurization unit, a plurality of wheel cylinders w1, w2, w3 and w4, and a pressure sensor 180.

[0023] A pressurizing unit is configured to pressurize the working fluid. The pressurizing unit may include at least one of a master cylinder 150 and an electric motor pump 160. The master cylinder 150 is configured to generate hydraulic pressure corresponding to a braking signal. In this case, the braking signal may be a signal corresponding to the amount of pedal travel by the driver or a deceleration signal provided by an automatic driving system. The master cylinder 150 may be configured such that the longitudinal direction of the master cylinder 150 is parallel to a surface of the valve block 190. The master cylinder 150 may include a first hydraulic chamber 151 and a second hydraulic chamber 152. The electric motor pump 160 may include a first pump 161 and a second pump 162, which are driven by an eccentric rotating shaft (not shown) of an electric motor 163 mounted on a surface of the valve block 190. The electric motor 163 may be mounted on a third surface of the valve block 190. In this disclosure, the third surface refers to the surface opposite to the surface on which a three-way solenoid valve unit is mounted. The first pump 161 and the second pump 162 may be disposed within the valve block 190.

[0024] An accumulator is configured to store working fluid. The accumulator can be connected to cylinders w1, w2, w3, and w4. When fluid flows from cylinders w1, w2, w3, and w4 to the accumulator, the hydraulic pressure in each of cylinders w1, w2, w3, and w4 decreases. The accumulator can be connected to the inlet of an electric motor pump 160. Fluid flowing from the accumulator to the electric motor pump 160 is pressurized in the electric motor pump 160. In this disclosure, the accumulator connected to the first pump 161 is referred to as the first accumulator 131, and the accumulator connected to the second pump 162 is referred to as the second accumulator 132. The accumulator can have a cylindrical shape, with the base of the cylinder parallel to the second surface.

[0025] Oil reservoir 120 stores working fluid. A master cylinder 150 may be connected in series between and to the oil reservoir 120 and wheel cylinders w1, w2, w3, and w4. Fluid in the oil reservoir 120 may flow to the wheel cylinders w1, w2, w3, and w4 via a pressurization unit. The oil reservoir 120 may be connected to the inlet of a first pump 161 and a second pump 162. Fluid flowing from the oil reservoir 120 to the electric motor pump 160 is pressurized in the electric motor pump 160. The oil reservoir 120 may be configured such that its longitudinal direction is parallel to a surface of the valve block 190. The oil reservoir 120 may include a first oil reservoir 121 and a second oil reservoir 122, and each of the first oil reservoir 121 and the second oil reservoir 122 may be connected to one of the first hydraulic chamber 151 and the second hydraulic chamber 152. In this disclosure, the accumulator and / or oil reservoir 120 is referred to as a fluid storage unit.

[0026] refer to Figure 1A braking system 100 for a vehicle includes a plurality of wheel cylinders w1, w2, w3, and w4. Wheel cylinders w1, w2, w3, and w4 are configured to use hydraulic pressure of a working fluid to limit wheel rotation. Each of wheel cylinders w1, w2, w3, and w4 can be mounted on one of the wheels of a vehicle. According to one embodiment of the present disclosure, the braking system 100 for a vehicle may include front wheel cylinder units w1 and w2 and rear wheel cylinder units w3 and w4. Front wheel cylinder units w1 and w2 include a left front wheel cylinder w1 mounted on the left front wheel and a right front wheel cylinder w2 mounted on the right front wheel. Rear wheel cylinder units w3 and w4 include a left rear wheel cylinder w3 mounted on the left rear wheel and a right rear wheel cylinder w4 mounted on the right rear wheel. Wheel cylinders w1, w2, w3, and w4 are connected to an accumulator and a pressurization unit. Wheel cylinders w1, w2, w3, and w4 may be connected in parallel to the pressurization unit.

[0027] The valve unit includes multiple solenoid valves. Specifically, the valve unit includes all or some of the following: a three-way solenoid valve unit, a first traction control valve 175, a second traction control valve 176, a first high-pressure switching valve 177, and a second high-pressure switching valve 178. The valve unit is configured to change the flow path in the valve block 190, i.e., the path of fluid flow between the fluid storage unit, the pressurization unit, and the multiple wheel cylinders w1, w2, w3, and w4, and / or change the amount of fluid flowing along the flow path in response to a valve control signal. For example, each solenoid valve may be configured to change its open / closed state according to the amount of current applied to it.

[0028] Figure 5 This is a cross-sectional view showing a three-way solenoid valve according to an embodiment of the present disclosure.

[0029] Figure 6 This is a simple block diagram illustrating a conventional braking device used in vehicles.

[0030] refer to Figure 6 In a universal braking device 6 for vehicles, inlet valve 3 and outlet valve 5 are connected to wheel cylinders. Inlet valve 3 opens or closes to regulate fluid flow from braking device 1 to wheel cylinder 7, and outlet valve 5 opens or closes to regulate fluid flow from wheel cylinder 7 to braking device 1. (Reference) Figure 5 The three-way solenoid valve unit includes at least one of three-way solenoid valves 171 to 174. The three-way solenoid valve unit is mounted on the first surface of the valve block 190.

[0031] Three-way solenoid valves 171 to 174 open or close to regulate fluid flow between the pressurization unit and wheel cylinders w1, w2, w3, and w4, and to regulate fluid flow between the fluid storage unit and wheel cylinders w1, w2, w3, and w4. That is, three-way solenoid valves 171 to 174 have all the functions of inlet valve 3 and outlet valve 5. Instead of inlet valve 3 and outlet valve 5, according to one embodiment of this disclosure, three-way solenoid valves 171 to 174 are connected to wheel cylinders w1, w2, w3, and w4. Accordingly, the number of solenoid valves connected to the braking system 100 for the vehicle can be reduced. In this disclosure, one of the three-way solenoid valves 171 to 174 connected to the left front wheel cylinder is referred to as left front wheel three-way solenoid valve 171. The other of the three-way solenoid valves 171 to 174 connected to the right front wheel cylinder is referred to as right front wheel three-way solenoid valve 172. The third valve among the three-way solenoid valves 171 to 174, which is connected to the side of the left rear wheel cylinder, is called the left rear wheel three-way solenoid valve 173. The fourth valve among the three-way solenoid valves 171 to 174, which is connected to the side of the right rear wheel cylinder, is called the right rear wheel three-way solenoid valve 174.

[0032] First to third ports P1, P2, and P3 are formed in each of three-way solenoid valves 171 to 174. The first port P1 can be connected to one side of the accumulator. The second port P2 can be connected to one side of each of the wheel cylinders w1, w2, w3, and w4. The third port P3 can be connected to one side of each of the pressurization units. Each of the three-way solenoid valves 171 to 174 includes a first open / close flow path A and a second open / close flow path B. The first open / close flow path is configured to allow fluid communication between the first port P1 and the second port P2 or to prevent fluid communication between the first port P1 and the second port P2. The second open / close flow path is configured to allow fluid communication between the second port P2 and the third port P3 or to prevent fluid communication between the second port P2 and the third port P3. The open / closed state of each of the first open / close flow path A and the second open / close flow path B can be adjusted by the amount of current applied to each of the three-way solenoid valves 171 to 174.

[0033] When the first open / close flow path A is closed and the second open / close flow path B is open, the pressurized fluid in the pressurization unit sequentially passes through the third port P3 and the second port P2, and flows to each of wheel cylinders w1, w2, w3, and w4. Accordingly, the braking pressure of each of wheel cylinders w1, w2, w3, and w4 is increased. This flow path connection state corresponds to the flow path connection state for the vehicle's braking device 6, in which the inlet valve 3 is open and the outlet valve 5 is closed. When both the first open / close flow path A and the second open / close flow path B are closed, the hydraulic pressure generated in each of the pressurization units is not transmitted to wheel cylinders w1, w2, w3, and w4, and the fluid in wheel cylinders w1, w2, w3, and w4 does not flow to the accumulator. Accordingly, the braking pressure of each of wheel cylinders w1, w2, w3, and w4 is maintained. This flow path connection state corresponds to the flow path connection state for the braking device 6 of a vehicle, in which both inlet valve 3 and outlet valve 5 are closed. When the first open / close flow path A is open and the second open / close flow path B is closed, fluid in wheel cylinders w1, w2, w3, and w4 flows to the accumulator, and the hydraulic pressure generated in the pressurization unit is not transmitted to wheel cylinders w1, w2, w3, and w4. Accordingly, the braking pressure of each of wheel cylinders w1, w2, w3, and w4 is reduced. This flow path connection state corresponds to the flow path connection state for the braking device 6 of a vehicle, in which inlet valve 3 is closed and outlet valve 5 is open. The first to third ports P1, P2, and P3 can be arranged to be spaced apart from each other in the longitudinal direction of each of the three-way solenoid valves 171 to 174. At least one of the three-way solenoid valves 171 to 174 can be arranged in a region extending from the bottom surface of the accumulator in a direction perpendicular to the second surface.

[0034] Traction control valves 175 and 176 may be installed in the flow path connecting the master cylinder 150 to wheel cylinders w1, w2, w3, and w4. Traction control valves 175 and 176 open or close to regulate fluid flow from the master cylinder 150 toward the wheel cylinders w1, w2, w3, and w4. Each of traction control valves 175 and 176 may be a normally open valve, which opens the flow path when no current is applied to the coil (not shown). High-pressure switching valves 177 and 178 may be installed in the flow path connecting the fluid storage unit to the inlet of the electric motor pump 160. According to one embodiment of this disclosure, high-pressure switching valves 177 and 178 are installed in the flow path connecting the inlet of the electric motor pump 160 to an accumulator. High-pressure switching valves 177 and 178 open or close to regulate fluid flow from the fluid storage unit to the inlet of the electric motor pump. Each of high-pressure switching valves 177 and 178 may be a normally closed valve, which closes the flow path when no current is applied to the coil. The valve unit disclosed herein is not limited to valve units that include only the valves described above. For example, the valve unit of this disclosure may also include a mixing valve (not shown) that mixes the fluid supplied to the front wheel cylinders w1 and w2 with the fluid supplied to the rear wheel cylinders w3 and w4.

[0035] The braking device 100 for a vehicle may include at least one pressure sensor 180. The pressure sensor 180 is configured to detect the hydraulic pressure of at least one of wheel cylinders w1, w2, w3 and w4, as well as the hydraulic pressure of the master cylinder 150.

[0036] refer to Figure 1 Four wheel cylinders w1, w2, w3, and w4 are mounted on different wheels, and each of the four three-way solenoid valves 171 to 174 is connected to one side of one of the different wheel cylinders w1, w2, w3, and w4. However, the braking device 100 for a vehicle disclosed herein is not limited to such a structure. For example, in the braking device 100 for a vehicle disclosed herein, three-way solenoid valves 171 and 172 are respectively connected to the front wheel cylinder units w1 and w2, and inlet valve 3 and outlet valve 5 can be respectively connected to the rear wheel cylinder units w3 and w4. A first hydraulic chamber 151, a first pump 161, and a first accumulator 131 are connected to the left front wheel three-way solenoid valve 171 and the right front wheel three-way solenoid valve 172. A second hydraulic chamber 152, a second pump 162, and a second accumulator 132 are connected to the left rear wheel three-way solenoid valve 173 and the right rear wheel three-way solenoid valve 174. The first port P1, the second port P2, and the third port P3 of each of the three-way solenoid valves 171 to 174 are connected to one side of each of the accumulators, one side of each of the wheel cylinders w1, w2, w3, and w4, and one side of each of the pressurization units. In this disclosure, the flow path connecting the three-way solenoid valves 171 to 174 to the accumulator is referred to as the first flow path 191.

[0037] A first traction control valve 175 is connected in series between and to the first hydraulic chamber 151 of the master cylinder 150 and the front wheel cylinders w1 and w2. A second traction control valve 176 is connected in series between and to the second hydraulic chamber 152 and the rear wheel cylinders w3 and w4. Fluid pressurized in the master cylinder 150 can sequentially flow through traction control valves 175 and 176 and three-way solenoid valves 171 to 174 to the wheel cylinders w1, w2, w3, and w4. A first oil reservoir 121 and the first hydraulic chamber 151 can be connected, and a second oil reservoir 122 and the second hydraulic chamber 152 can be connected. A first high-pressure switching valve 177 can be installed in the flow path connecting the first hydraulic chamber 151 to the inlet of the first pump 161, and a second high-pressure switching valve 178 can be installed in the flow path connecting the second hydraulic chamber 152 to the inlet of the second pump 162. Fluid in the first oil reservoir 121 can sequentially pass through the first hydraulic chamber 151 and the first high-pressure switching valve 177 to be supplied to the first pump 161. Fluid in the second oil reservoir 122 can sequentially pass through the second hydraulic chamber 152 and the second high-pressure switching valve 178 to be supplied to the second pump 162. Additionally, the first accumulator 131 can be connected to the first pump 161, and the second accumulator 132 can be connected to the second pump 162. In this disclosure, the left front wheel cylinder w1 and the right front wheel cylinder w2 are connected to the first pump 161 and the first accumulator 131, and the left rear wheel cylinder w3 and the right rear wheel cylinder w4 are connected to the second pump 162 and the second accumulator 132; however, this disclosure is not limited to such connections. For example, in a braking device 100 for a vehicle, the left front wheel cylinder w1 and the right rear wheel cylinder w4 can be connected to a first pump 161 and a first accumulator 131, and the right front wheel cylinder w2 and the left rear wheel cylinder w3 can be connected to a second pump 162 and a second accumulator 132.

[0038] When the second open / close flow path B is open and the first open / close flow path A is closed, the hydraulic pressure in each of the wheel cylinders w1, w2, w3, and w4 increases because the fluid pressurized in the reservoir 120 and / or the electric motor pump 160 flows sequentially through the third port P3 and the second port P2 of each of the three-way solenoid valves 171 to 174 to each other. When the second open / close flow path B is closed and the first open / close flow path A is open, the fluid in each of the wheel cylinders w1, w2, w3, and w4 can flow sequentially through the second port P2 and the first port P1 to the accumulator. Accordingly, the hydraulic pressure in each of the wheel cylinders w1, w2, w3, and w4 decreases. When the first open / close flow path A and the second open / close flow path B are closed, the hydraulic pressure in each of the wheel cylinders w1, w2, w3, and w4 is maintained.

[0039] Pressure sensor 180 is configured to detect the hydraulic pressure of at least one of wheel cylinders w1, w2, w3, and w4, as well as the hydraulic pressure of master cylinder 150. Pressure sensor 180 is disposed between three-way solenoid valves 171 to 174 and a fourth surface of valve block 190. In this case, the fourth surface is a surface perpendicular to the first and second surfaces. For example, Figure 3 The fourth surface can be either the left or right surface of valve block 190.

[0040] A valve unit is installed in a valve hole stamped in the first surface of the valve block 190. The valve unit can be installed perpendicular to the first surface. A motor 163 can be installed on the third surface of the valve block 190. In this disclosure, the third surface is referred to as the surface opposite to the first surface. A first pump 161 and a second pump 162 driven by the rotation of the motor 163 can be disposed in the valve block 190. In this disclosure, the flow path through which the accumulators and three-way solenoid valves 171 to 174 communicate with each other is referred to as the first flow path 191. At least a portion of the first accumulator 131 and the second accumulator 132 are disposed between the second surface of the valve block 190 and the three-way solenoid valves 171 to 174. Accordingly, even when the first flow path 191 is formed to extend from the first accumulator 131 and the second accumulator 132 in only one direction, the three-way solenoid valves 171 to 174 and the first accumulator 131 and the second accumulator 132 can communicate with each other. A portion of the accumulator can be housed within the valve block 190, with the remainder exposed to the outside of the valve block 190. All accumulators can be housed within the valve block 190. Alternatively, the accumulators and valve block 190 are not manufactured separately, and the accumulators can be formed as hollow portions within the valve block 190. The accumulators can have a cylindrical shape with their bottom surface parallel to the second surface, and at least one of the three-way solenoid valves 171 to 174 can be located in a region extending from the bottom surface of the accumulator in a direction perpendicular to the second surface. Due to this arrangement, the third port P3 is located in a region extending from the outer peripheral surface of each of the first accumulator 131 and the second accumulator 132 in a direction along the central axis. The second flow path 192 can be formed through the third surface of the valve block 190. In this case, the third surface is the surface opposite to the first surface. The master cylinder 150 connected to the third flow path 193 can be located adjacent to the third surface.

[0041] A pair of cylindrical first accumulators 131 and second accumulators 132 are disposed on the bottom surface of valve block 190. Each of the pair of first flow paths 191 extends from one of the different first accumulators 131 and second accumulators 132 in the height direction of valve block 190. A pair of three-way solenoid valves 171 and 172 are connected in parallel to the first flow path 191 communicating with the first accumulator 131. A pair of three-way solenoid valves 173 and 174 are connected in parallel to the first flow path 191 communicating with the second accumulator 132. Specifically, the first port P1 of each of the three-way solenoid valves 171 to 174 is connected to the accumulator. At least a portion of the three-way solenoid valves 171 to 174 is disposed in a region extending in the height direction from the bottom surface of the accumulator. Hereinafter, the three-way solenoid valves 171 and 172 connected to the left first flow path 191 are referred to as the front wheel three-way solenoid valves 171 and 172. The three-way solenoid valves 173 and 174 connected to the first flow path 191 on the right are referred to as the rear wheel three-way solenoid valves 173 and 174.

[0042] One of the front wheel three-way solenoid valves 171 and 172 is connected to the left front wheel cylinder w1, and the other is connected to the right front wheel cylinder w2. One of the pair of rear wheel three-way solenoid valves 173 and 174 is connected to the left rear wheel cylinder w3, and the other is connected to the right rear wheel cylinder w4. Specifically, the second port P2 of each of the three-way solenoid valves 171 to 174 is connected to one side of one of the wheel cylinders w1, w2, w3, and w4.

[0043] The third port P3 of each of the front wheel three-way solenoid valves 171 and 172 is connected to the outlet of the first pump 161 and the first hydraulic chamber 151. The third port P3 of each of the rear wheel three-way solenoid valves 173 and 174 is connected to the outlet of the second pump 162 and the second hydraulic chamber 152. A first traction control valve 175 is installed on a third flow path 193 connecting the first hydraulic chamber 151 of the master cylinder 150 to the front wheel three-way solenoid valves 171 and 172. A second traction control valve 176 is installed on a second flow path 192 connecting the second hydraulic chamber 152 of the master cylinder 150 to the rear wheel three-way solenoid valves 173 and 174. The outlet of the first pump 161 is connected to the flow path connecting the first traction control valve 175 and the front wheel three-way solenoid valves 171 and 172. The outlet of the second pump 162 is connected to the flow path connecting the second traction control valve 176 and the rear wheel three-way solenoid valves 173 and 174. Due to this connection, the first traction control valve 175 is positioned between the front wheel three-way solenoid valves 171 and 172 in a direction perpendicular to the second surface. The second traction control valve 176 is positioned between the rear wheel three-way solenoid valves 173 and 174 in a direction perpendicular to the second surface.

[0044] According to one embodiment of this disclosure, the first to third ports P1, P2, and P3 are spaced apart from each other in the longitudinal direction of each of the three-way solenoid valves 171 to 174. In the valve block 190, at least a portion of a first flow path 191 connecting the first port P1 to the accumulator is disposed on a surface spaced a first distance from the first surface. A second flow path 192 connecting the second port P2 to each of the corresponding wheel cylinders w1, w2, w3, and w4 is disposed on a surface spaced a second distance from the first surface. A third flow path 193 connecting the third port P3 to the pressurization unit is disposed on a surface spaced a third distance from the first surface.

[0045] refer to Figure 5 The first port P1 is positioned above the second port P2 of each of the three-way solenoid valves 171 to 174. The second port P2 is positioned above the third port P3 of each of the three-way solenoid valves 171 to 174. Due to this configuration, the second port P2 is positioned further away from the mounting surface than the first port P1 of each of the three-way solenoid valves 171 to 174 in the direction toward the motor pump 160. The third port P3 is positioned further away from the mounting surface than the second port P2 of each of the three-way solenoid valves 171 to 174 in the direction toward the motor pump 160. Accordingly, the second flow path 192 is positioned closer to the motor pump 160 than the first flow path 191, and the third flow path 193 is positioned closer to the motor pump 160 than the second flow path 192.

[0046] The first pump 161 and the second pump 162 are disposed in the valve block 190. An accumulator is mounted on the bottom surface of the valve block 190, the first pump 161 and the second pump 162 are disposed above the accumulator, and a three-way solenoid valve is disposed above the first pump 161 and the second pump 162.

[0047] A first high-pressure switching valve 177 is installed in the flow path connecting the first hydraulic chamber 151 to the inlet of the first pump 161. A second high-pressure switching valve 178 is installed in the flow path connecting the second hydraulic chamber 152 to the inlet of the second pump 162.

[0048] In a braking device 100 for a vehicle according to one embodiment of the present disclosure, a first flow path 191, a second flow path 192, and a third flow path 193, which open or close to control the hydraulic pressure on one side of the front wheel cylinder w1 and the other side of the front wheel cylinder w2, are formed as many as the number of three-way solenoid valves 171 to 174. The flow paths can be configured to be laterally symmetrical in the valve block 190. When the flow paths are configured as described above, the flow path on one side of the laterally symmetrical flow path is provided to the flow path of fluid in the front wheel cylinders w1 and w2, and the flow path on the other side is provided to the flow path of fluid in the rear wheel cylinders w3 and w4.

[0049] In a braking device 100 for a vehicle according to one embodiment of the present disclosure, since the three-way solenoid valves 171 to 174 are used as the inlet valve 3 and the outlet valve 5, the manufacturing cost of the hydraulic braking device is reduced. Additionally, the volume of the valve block 190 is reduced, and the manufacturing process of the valve block 190 is simplified.

[0050] According to one embodiment, in a braking device for a vehicle, since a three-way solenoid valve is used as both the inlet and outlet valves, the manufacturing cost and size of the hydraulic braking device can be reduced.

Claims

1. A braking device for a vehicle, comprising: A three-way solenoid valve unit, comprising one or more three-way solenoid valves; A valve block having a first surface, wherein the three-way solenoid valve unit is mounted on the first surface; At least one accumulator is configured to store working fluid; A pressurization unit is configured to pressurize the working fluid; as well as Multiple wheel cylinders are configured to use the hydraulic pressure of the working fluid to limit the rotation of the wheel. Each three-way solenoid valve includes a first port, a second port, a third port, a first open / close flow path, and a second open / close flow path. The first open / close flow path is configured to allow or prevent fluid communication between the first port and the second port. The second open / close flow path is configured to allow or prevent fluid communication between the second port and the third port. At least a portion of the at least one accumulator is disposed between the three-way solenoid valve unit and the second surface of the valve block. in, The pressurization unit includes an electric motor pump disposed within the valve block; and A high-pressure switching valve is installed in the flow path that connects the inlet of the electric motor pump to the at least one accumulator.

2. The braking device according to claim 1, wherein: The at least one energy storage device has a cylindrical shape, and the bottom surface of the cylindrical shape is parallel to the second surface; as well as At least one of the one or more three-way solenoid valves is disposed in a region extending from the bottom surface of the at least one accumulator in a direction perpendicular to the second surface.

3. The braking device according to claim 1, wherein, The three-way solenoid valve unit is mounted perpendicular to the first surface of the valve block.

4. The braking device according to claim 1, wherein: The first port, the second port, and the third port of each three-way solenoid valve are configured to be spaced apart from each other in the longitudinal direction; as well as In the valve block, The first port of each three-way solenoid valve is connected to at least a portion of the first flow path of the at least one accumulator, which is disposed on a surface spaced a first distance from the first surface. A second flow path connecting the second port of each three-way solenoid valve to the corresponding wheel cylinder among the plurality of wheel cylinders is disposed on a surface spaced a second distance from the first surface, and The third port of each three-way solenoid valve is connected to the third flow path of the pressurizing unit, which is disposed on a surface spaced a third distance from the first surface.

5. The braking device according to claim 4, wherein: The second flow path passes through the third surface of the valve block, which is the surface opposite to the second surface.

6. The braking device according to claim 1, wherein: The at least one energy storage device is provided as a plurality of energy storage devices; and Each of the plurality of accumulators is connected to at least one of the one or more three-way solenoid valves.

7. The braking device according to claim 6, wherein, The one or more three-way solenoid valves are connected to each of the plurality of accumulators.

8. The braking device according to claim 1, wherein: The pressurization unit includes a master cylinder configured to generate hydraulic pressure corresponding to a braking signal; and The traction control valve is installed in the flow path that connects the master cylinder to the three-way solenoid valve unit.

9. The braking device according to claim 1, wherein: The motor of the electric pump is mounted on the third surface of the valve block, which is the surface opposite to the first surface.

10. The braking device of claim 1, further comprising at least one pressure sensor configured to detect the hydraulic pressure of at least one of the plurality of wheel cylinders and the hydraulic pressure of the master cylinder. in, The pressurization unit includes the master cylinder, which is configured to generate hydraulic pressure corresponding to a braking signal.

11. The braking device according to claim 10, wherein: The at least one pressure sensor is disposed between the three-way solenoid valve unit and the fourth surface of the valve block; and The fourth surface is a surface perpendicular to the first surface and the second surface.

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