JP2000318600A - Fluid passage opening and closing valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To brake a vehicle by braking operation, even when electrization is stopped due to some reasons in the middle of travelling by incorporating a fluid passage valve juxtaposed with a by-pass which is free to open and close by hydraulic pressure into the fluid passage to be opened and closed by a solenoid valve in a wheel brake device of the vehicle. SOLUTION: A fluid passage opening and closing valve 1 is constituted by providing fluid passages 5, 6, 7 to be communicated and blocked by a solenoid valve SOV on a valve body 2 and providing a by-pass 13 to be opened and closed by a by-pass valve BPV furnished with a check ball 16 energized by a return spring 17. It is possible to safely brake a vehicle as hydraulic pressure can be supplied to a wheel cylinder through the by-pass 13 as hydraulic pressure supplied from a master cylinder opens the by-pass valve BPV, when a driver steps on a brake even when electrization is stopped on the solenoid valve SOV and the fluid passages 5, 6 are closed from each other while the vehicle travels.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inexpensive and safe fluid passage opening / closing valve for use in, for example, a vehicle parking device.

[0002]

2. Description of the Related Art Conventionally, a vehicle equipped with a unit in which an electromagnetic powder clutch is combined with a manual transmission is different from a unit in which a friction clutch is combined with a manual transmission, in which the frictional force of an engine is used when parking the vehicle. To lock the wheels in the direction of rotation. Therefore, a parking device that engages a parking pawl inserted from the transmission is added to a parking gear provided on the output shaft of the transmission, such as an automatic transmission.
However, the parking device has a complicated structure and a large number of parts. In order to add a parking device, the number of man-hours required for new development is required. Therefore, when a driver depresses a brake pedal, a hydraulic pressure from a master cylinder is supplied to a wheel cylinder, and a conventional hydraulic pressure supply passage of a wheel braking device of a vehicle for operating a wheel brake as shown in FIG. By incorporating the fluid passage opening / closing valve 51, a vehicle parking device having a simple structure is configured.

As shown in FIG. 8, a conventional fluid passage opening / closing valve 51 includes a fluid passage 5 formed in a valve body 52.
3 and a valve seat 5 provided in the middle of the fluid passage 53.
And an electromagnetic actuator 56 that expands and contracts a rod valve 55 that is attached to and separated from the actuator 4.
The fluid valve 53 is opened by drawing in the rod valve 55 by energizing the
Is stopped, the return valve (not shown) causes the rod valve 55 to protrude to close the fluid passage 53.

[0004] The fluid passage opening / closing valve 5 configured as described above.
When the vehicle 1 is parked by incorporating 1 into the hydraulic pressure supply passage of the wheel braking device of the vehicle, the following control is performed. When the vehicle is normally stopped after traveling, the actuator 5 is controlled by a command from an electronic control unit (not shown).
6 is energized, the rod valve 55 is retracted, and the fluid passage 53 is open.
When the driver depresses the brake pedal, the hydraulic pressure from the master cylinder is supplied to the wheel cylinder via the fluid passage 53, and the wheel brake can be operated. In this state, when the driver depresses the brake pedal and operates the parking switch to the parking lock side, the electronic control unit issues a parking lock command based on signals from a vehicle speed sensor (not shown), a brake pedal on / off sensor, and a parking on / off sensor. Transmit, actuator 5
6, the rod valve 55 closes the fluid passage 53, so that the fluid pressure supply passage of the wheel braking device is shut off, and the fluid pressure supplied to the wheel cylinder is maintained. The operation of the wheel brakes continues, and the vehicle is parked.

When the driver turns on the key switch and operates the parking switch to the parking releasing side to release the parking state of the vehicle and enable normal driving, the electronic control unit operates the parking on / off sensor. A parking release command is transmitted based on the signal from the controller and the actuator 56 is energized to open the fluid passage 53.
When the fluid passage 53 is opened, the communication between the master cylinder and the wheel cylinder is established, so that the hydraulic pressure on the wheel cylinder side is reduced, and the operation of the wheel brake is released. Become. And
Each time the driver depresses the brake pedal during traveling, the wheel brake is activated, and the vehicle can be braked freely.

[0006]

However, when the above-described conventional fluid passage opening / closing valve 51 is incorporated in a wheel braking device, the actuator may be operated during traveling due to some kind of erroneous operation, failure of the power supply, or stoppage of the function of the electronic control unit. 56
When the power supply is stopped, the fluid passage 53 is closed, so that the hydraulic pressure supply passage between the master cylinder and the wheel cylinder is closed. When the hydraulic pressure supply passage between the master cylinder and the wheel cylinder is closed, the wheel brake is not activated and the vehicle cannot be braked because the hydraulic pressure from the master cylinder is not supplied to the wheel cylinder even if the driver steps on the brake. Become.

Accordingly, in the present invention, when the driver depresses the brake pedal, the hydraulic pressure from the master cylinder is supplied to the wheel cylinder, and the hydraulic pressure is incorporated in the hydraulic pressure supply passage of the wheel braking device of the vehicle that operates the wheel brake. Provided is a fluid passage opening / closing valve which can brake a vehicle by a driver's brake operation even when the power supply is stopped during traveling due to some kind of erroneous operation, failure of a power supply, stoppage of a function of an electronic control device, or the like. This is an issue to be solved.

[0008]

The above objects can be achieved by a fluid passage opening / closing valve described in the claims. 6. The hydraulic pressure supply passage of a wheel braking device of a vehicle for supplying a hydraulic pressure from a master cylinder to a wheel cylinder when a driver depresses a brake pedal and operating a wheel brake. When the vehicle is running, the solenoid valve opens the fluid passage by energization based on a command from the electronic control unit during vehicle running. The hydraulic pressure supplied from the side (master cylinder) is supplied to the operating side (wheel cylinder), and the wheel brake operates. If the energization is stopped during running due to some kind of erroneous operation, failure of the power supply, or stoppage of the function of the electronic control unit, the solenoid valve closes the fluid passage. When the hydraulic pressure becomes higher than the hydraulic pressure of the wheel, that is, when the driver steps on the brake, the hydraulic pressure from the supply side (master cylinder) is supplied to the working side (wheel cylinder) by opening the bypass passage. The brake can be activated. Therefore, when the fluid passage opening / closing valve according to the first, second, third, fourth, and fifth aspects is incorporated in the hydraulic pressure supply passage of the vehicle wheel braking device, any erroneous operation, failure of the power supply, or electronic control during traveling will occur. Even if the energization of the solenoid valve is stopped due to the stoppage of the function of the device, the brake is reliably operated. Next, a case where the vehicle is parked will be described. When the vehicle is stopped after normal running, the solenoid valve is energized based on a command from the electronic control unit and the fluid passage is opened, so when the driver depresses the brake pedal, the Is supplied to the wheel cylinder through the fluid passage,
Wheel brake can operate. When the driver operates the parking switch to the parking lock side while depressing the brake pedal, the electronic control unit issues a parking lock command and stops energizing the solenoid valve, so that the fluid passage is closed. Is shut off, and the hydraulic pressure supplied to the wheel cylinder is maintained. Therefore, the operation of the wheel brake is continued, and the vehicle enters the parking state.
Since the bypass valve closes the bypass when the supply-side hydraulic pressure is lower than the operating-side hydraulic pressure (when the brake pedal is released), the bypass valve closes when the vehicle is parked as described above. ing.

According to the fluid passage opening / closing valve according to the second aspect, the valve body is formed in the same shape by rotating the valve body by 180 degrees, so that the processing jig is simple, the manufacturing is easy, and the manufacturing can be performed at low cost. .

According to a third aspect of the present invention, the valve body has the same side face as each mounting screw hole of each pipe connected to the supply side and the operating side and each passage hole communicating therewith. In this case, the processing jig is simplified, the production is easy, and the production can be performed at low cost. Also, piping work becomes easy.

According to the fluid passage opening / closing valve of the fifth aspect, when the hydraulic pressure supply passage is interposed between the master cylinder and the wheel cylinder of the wheel braking device of the vehicle, connection of piping and the like to the valve body. And inspection and the like become easy.

Next, when the driver depresses the brake pedal, the hydraulic pressure from the master cylinder is supplied to the wheel cylinder, and the hydraulic pressure is supplied to the hydraulic pressure supply passage of the wheel braking device of the vehicle for operating the wheel brake. , 8 will be explained. While the vehicle is running, the solenoid valve opens the fluid passage by energization based on a command from the electronic control unit. Therefore, when the driver depresses the brake pedal, the hydraulic pressure supplied from the supply side (master cylinder) is reduced. It is supplied to the operating side (wheel cylinder), and the wheel brake operates. If the energization is stopped during running due to some kind of erroneous operation, failure of the power supply, or stoppage of the function of the electronic control unit, the solenoid valve closes the fluid passage. When the hydraulic pressure becomes higher than the hydraulic pressure of the wheel, that is, when the driver depresses the brake, the bypass passage is opened to supply the hydraulic pressure from the supply side (master cylinder) to the operating side (wheel cylinder). The brake can be activated. Therefore, when the fluid passage opening / closing valve according to claim 6, 7 or 8 is incorporated in the hydraulic pressure supply passage of the wheel braking device of the vehicle, any erroneous operation, failure of the power supply, or stoppage of the function of the electronic control device during traveling. Even if the solenoid valve is de-energized for example, the brake operates reliably. Next, a case where the vehicle is parked will be described. When the vehicle is stopped after normal running, the solenoid valve is energized based on a command from the electronic control unit and the fluid passage is open, so when the driver depresses the brake pedal, the master cylinder is depressed. Is supplied to the wheel cylinder via the fluid passage, and the wheel brake can be operated. When the driver operates the parking switch to the parking lock side while depressing the brake pedal, the electronic control unit issues a parking lock command and stops the energization of the solenoid valve, so that the fluid passage is closed and the wheel braking is performed. The hydraulic pressure supply passage of the device is shut off, and the hydraulic pressure supplied to the wheel cylinder is maintained. Therefore, the operation of the wheel brake is continued, and the vehicle enters the parking state. Even if the brake pedal is returned after the fluid passage is closed, the supply valve side hydraulic pressure is lower than the operating side hydraulic pressure, so the bypass valve closes the bypass. As described above, if the hydraulic pressure supplied to the wheel cylinder is maintained at a high pressure for a long time, the durability of the brake hose, the rubber cup of the brake cylinder, the brake fluid, and the like may be adversely affected. Therefore, the relief valve opens the relief port when the hydraulic pressure on the operating side (wheel cylinder) exceeds the set pressure, and relieves the hydraulic pressure on the operating side (wheel cylinder) to the supply side to regulate it to the set pressure. Press. Thereby, the life of the brake hose, the rubber cup of the brake cylinder, the brake fluid, and the like can be extended.

According to the fluid passage opening / closing valve according to the seventh aspect, the shapes of the components constituting the solenoid valve, the bypass valve, and the relief valve are unified, and
Since the dimensions of each mounting screw hole of each pipe connected to the supply side and the operation side and each passage hole communicating therewith are unified, the processing jig becomes simple, the manufacturing is easy, and the manufacturing can be performed at low cost.

According to the fluid passage opening / closing valve according to the ninth aspect, a manual valve is employed in place of the electromagnetic solenoid valve, so that the valve can be manufactured at low cost.

According to a tenth aspect of the present invention, when the driver depresses the brake pedal, the hydraulic pressure from the master cylinder is supplied to the wheel cylinder to operate the wheel brake. When incorporated in the hydraulic pressure supply passage, a vehicle parking device that is inexpensive and has a simple structure can be configured.

[0016]

Next, an embodiment of the present invention will be described. In the following description, descriptions indicating directions such as front, rear, left, right, up, and down indicate directions on the drawing. FIG. 1 is a sectional view showing a fluid passage opening / closing valve 1 according to a first embodiment. As shown in FIG.
Has a valve body 2 which is substantially rectangular and has the same 180-degree rotation shape, and an electromagnetic actuator 3 is attached to the upper part of the valve body 2. When the actuator 3 is energized based on a command from an electronic control unit (not shown), the actuator 3 retracts the rod valve 4 in the upward direction, and in the non-energized state, the rod valve 4 is energized by a return spring (not shown). Are configured to protrude. Fluid passages 5, 6, 7 are formed in the valve body 2, and the fluid passage 5 is communicated with, for example, a screw hole 8 to which a pipe connected to a master cylinder of a vehicle wheel braking device is connected. Reference numeral 7 communicates with a screw hole 9 to which a pipe connected to, for example, a wheel cylinder is connected. The rod valve 4 communicates and shuts off between the fluid passage 5 and the fluid passage 6. When the actuator 3 is energized based on a command from the electronic control unit, the rod valve 4 connects to the valve chamber 10 above the fluid passage 6. The fluid passage 5, the fluid passage 6, and the fluid passage 7 are separated from the provided valve seat 11 and communicate with each other. When the actuator 3 is not energized, the actuator 3 comes into contact with the valve seat 11 and shuts off between the fluid passage 5 and the fluid passage 6. FIG. 1 shows a state in which the rod valve 4 cuts off between the fluid passage 5 and the fluid passage 6. Further, the actuator 3, the rod valve 4, the valve chamber 10, and the valve seat 11 constitute a solenoid valve SOV described in claims.

The valve body 2 is provided with a bypass valve BPV. The bypass valve BPV is for opening and closing a bypass 13 provided between the fluid passage 5 and the fluid passage 7, and is attached to a valve seat 15 provided at an upper end of the valve chamber 14 and attached to the valve seat 15. It includes a check ball 16 that comes in contact with and separates therefrom, a return spring 17 that urges the check ball 16 in a direction to close the bypass 13, and a spring holder 18 that elastically attaches the return spring 17. When the hydraulic pressure supplied from the screw hole 8 side is higher than the hydraulic pressure on the screw hole 9 side when the rod valve 4 blocks the fluid passages 5 and 6, the return valve Check ball 16 against urging force of 17
Is pushed down. Thus, even when the rod valve 4 blocks the fluid passages 5 and 6, the fluid passage 5, the bypass 13, and the fluid passage 7 are communicated with each other. For example, when the driver depresses the brake pedal, the vehicle The hydraulic pressure supplied from the master cylinder of the wheel braking device is supplied to the wheel cylinder.

Next, when the driver depresses the brake pedal, the hydraulic pressure from the master cylinder is supplied to the wheel cylinder, and the fluid having the above-described structure is supplied to the hydraulic pressure supply passage in the wheel braking device of the vehicle that operates the wheel brake. The operation of the vehicle parking device with the passage opening / closing valve 1 interposed will be described. A pipe connected to a master cylinder (hydraulic pressure supply side) is connected to the screw hole 8 of the fluid passage opening / closing valve 1, and a pipe connected to a wheel cylinder (operating side) is connected to the screw hole 9. Connected.

First, the operation when the vehicle is parked will be described. In a state where the vehicle is normally stopped after traveling, the actuator 3 is energized by a command from an electronic control unit (not shown), so that the rod valve 4 is retracted and the fluid passages 5, 6, and 7 are communicated. When the driver depresses the brake pedal, the hydraulic pressure from the master cylinder is applied to the fluid passages 5, 6, 7
Is supplied to the wheel cylinder via the wheel to operate the wheel brake. In this state, when the driver depresses the brake pedal and operates the parking switch to the parking lock side, the electronic control unit issues a parking lock command based on signals from a vehicle speed sensor (not shown), a brake pedal on / off sensor, and a parking on / off sensor. Since the power is transmitted to the actuator 3 to stop the supply of electricity to the actuator 3, the rod valve 4 is protruded to close the fluid passages 5 and 6, so that the hydraulic pressure supply passage of the wheel braking device is shut off and the fluid is supplied to the wheel cylinder. Since the high hydraulic pressure is maintained, the operation of the wheel brake is continued, and the vehicle enters the parking state. In this state, since the hydraulic pressure on the wheel cylinder side is higher than the hydraulic pressure on the master cylinder side, the bypass valve BPV closes the bypass 13. In addition, the return spring that urges the rod valve 4 in the protruding direction does not separate the spherical end of the rod valve 4 from the valve seat 11 even when the distal spherical surface of the rod valve 4 receives hydraulic pressure from the wheel cylinder side. It has such a biasing force. By setting the urging force of the return spring to a value corresponding to the hydraulic pressure desired to be held by the wheel cylinder, the relief of the fluid passage opening / closing valve 1c of the fourth embodiment shown in FIGS. A function corresponding to the valve LFV can be added.

Next, the operation of releasing the parking state of the vehicle and enabling the vehicle to travel will be described. When the driver turns on the key switch and operates the parking switch to the parking release side, the electronic control unit issues a parking release command based on a signal from the parking on / off sensor, energizes the actuator 3, and supplies the rod valve 4. And the fluid passages 5, 6, 7 are communicated.
When the fluid passages 5, 6, and 7 are communicated, the communication between the master cylinder and the wheel cylinder is established, so that the hydraulic pressure on the wheel cylinder side is reduced, and the operation of the wheel brake is released. Can be done. Then, each time the driver depresses the brake pedal during traveling, the wheel brake is activated, and the vehicle can be braked freely.

If the power supply to the actuator 3 is stopped during running of the vehicle due to some kind of erroneous operation, failure of the power supply, or stoppage of the function of the electronic control unit, the rod valve 4 closes the space between the fluid passages 5 and 6. In this state, when the driver steps on the brake, the high hydraulic pressure from the master cylinder is applied to the check ball 16 of the bypass valve BPV through the bypass 13, so that the check ball 16 is pushed down and the fluid passage 5 , Bypass 13 and fluid passage 7 are communicated. As a result, the hydraulic pressure from the master cylinder is supplied to the wheel cylinder via the fluid passage 5, the bypass 13, and the fluid passage 7, so that the wheel brake operates and the vehicle can be braked. Since the bypass valve BPV is provided in this way, even if the power supply to the actuator 3 is stopped during running of the vehicle due to some kind of erroneous operation, failure of the power supply, or stoppage of the function of the electronic control unit, the vehicle can be safely braked. Can be. In addition, since the valve body 2 is rotated by 180 degrees to have the same shape, when manufacturing the fluid passage opening / closing valve 1, the processing jig and tool are simplified,
It is easy to manufacture and can be manufactured at low cost.

Next, a description will be given of a fluid passage opening / closing valve 1a according to a second embodiment. FIG. 2 is a sectional view of the fluid passage on-off valve 1a. As shown in FIG. 2, the fluid passage opening / closing valve 1a
The screw holes 8 and 9 described in the fluid passage opening / closing valve 1 of the first embodiment are provided on the same surface of the valve body 2 so that the machining directions of the fluid passage 5 and the fluid passage 7 are the same. . Note that the other configuration is the same as that of the fluid passage opening / closing valve 1, and thus the description of the configuration will not be repeated. FIG. 2 shows a state in which the rod valve 4 cuts off between the fluid passage 5 and the fluid passage 6. Fluid passage on-off valve 1a configured as described above
Is manufactured, the processing jig is simplified, the manufacturing is easy, and it can be manufactured at low cost. In addition, it has a feature that piping work is facilitated. The operation when the fluid passage opening / closing valve 1a is interposed between the master cylinder and the wheel cylinder of the above-described vehicle wheel braking device to form a vehicle parking device is the same as that of the fluid passage opening / closing valve 1 described above. Therefore, no duplicate explanation will be given.

Next, a description will be given of a fluid passage opening / closing valve 1b according to a third embodiment. FIG. 3 is a cross-sectional view of the fluid passage opening / closing valve 1b. The fluid passage opening / closing valve 1a according to the second embodiment has a screw hole 9 provided on the same surface as the screw hole 8, whereas the fluid passage opening / closing valve 1b according to the third embodiment.
The screw hole 9 is provided on the lower surface of the valve body 2. Therefore, in the fluid passage on-off valve 1b, the plug 20 is screwed into the screw hole 9 of the fluid passage on-off valve 1a,
Blocked. Further, a plug 21 is mounted in place of the spring holder 18 of the fluid passage opening / closing valve 1 a, the return spring 17 is elastically attached to the plug 21, and the screw hole 9 is formed in the plug 21. Note that the other configuration is basically the same as the fluid passage on-off valve 1,
No duplicate description of the configuration. FIG. 3 shows a state in which the rod valve 4 cuts off between the fluid passage 5 and the fluid passage 6. The fluid passage opening / closing valve 1b configured as described above is
When interposed in the hydraulic pressure supply passage between the master cylinder and the wheel cylinder of the vehicle wheel braking device, a fluid passage opening / closing valve 1b is attached to an engine room partition plate or the like of the vehicle, and the master cylinder is disposed at substantially the same height. A screw hole 8 is formed on the lateral side of the valve body 2 that can be piped horizontally.
Since the screw holes 9 are formed in the lower surface of the valve cylinder 2 which can be piped in a substantially vertical direction with the wheel cylinder arranged near the ground, connection of the pipes and the like to the screw holes 8 and the screw holes 9 becomes easy. , And easy inspection.

The operation when the fluid passage opening / closing valve 1b is interposed between the master cylinder and the wheel cylinder of the above-described vehicle wheel braking device to constitute a vehicle parking device is as follows.
Since it is the same as the above-mentioned fluid passage opening / closing valve 1, it will not be described repeatedly.

As described above, FIG.
FIG. 4 shows a state in which the rod valve 4 of FIG. 2b has cut off between the fluid passage 5 and the fluid passage 6, whereas FIG. FIG. 4 is a cross-sectional view showing a state in which an actuator 3 is energized and a rod valve 4 is separated from a valve seat 11 to communicate between fluid passages 5 and 6. That is, it shows the state of the fluid passage opening / closing valve 1b when the vehicle is running normally. In this state, the bypass valve BPV closes the bypass 13.

FIG. 5 shows that the rod valve 4 is connected between the fluid passages 5 and 6 when the power supply to the actuator 3 is stopped during running of the vehicle due to some kind of erroneous operation, failure of the power supply, or stoppage of the function of the electronic control unit. FIG. 5 is a cross-sectional view showing an operation state of a fluid passage opening / closing valve 1b when a driver steps on a brake in a state in which is closed. In this case, since the high hydraulic pressure from the master cylinder is applied to the check ball 16 of the bypass valve BPV through the bypass 13 of the fluid passage opening / closing valve 1b, the check ball 16 is pushed down and the fluid passage 5, the bypass 13, the fluid The passage 7a is communicated. As a result, the hydraulic pressure from the master cylinder increases
Since the vehicle is supplied to the wheel cylinder via the bypass 13 and the fluid passage 7a, the wheel brake is operated, and the vehicle can be braked.

Next, a fluid passage opening / closing valve 1c according to a fourth embodiment will be described. FIG. 6 is a sectional view of the fluid passage on-off valve 1c. As shown in FIG. 6, the fluid passage opening / closing valve 1c
Is provided with a solenoid valve SOV and a bypass valve BPV similarly to the fluid passage opening / closing valve 1 of the above-described first embodiment, and is further provided with a relief valve LFV not provided in the fluid passage opening / closing valve 1. I have. As shown in FIG. 6, the fluid passage opening / closing valve 1 has an electromagnetic actuator 3 mounted on an upper portion of a valve body 2. The actuator 3 pulls the rod valve 4 upward when energized by an electronic control unit (not shown).
In the non-energized state, the rod valve 4 is configured to protrude downward by the urging force of a return spring (not shown). The fluid passages 5, 6, 7 and the relief port 3 of the relief valve LFV are provided in the valve body 2.
1 and a fluid passage 32 are formed. Fluid passage 5
Is connected to a screw hole 8 to which a pipe connected to a master cylinder of a vehicle wheel braking device is connected, for example, and the fluid passage 7 is connected to a screw hole 9 to which a pipe connected to, for example, a wheel cylinder is connected. ing. Above rod valve 4
Is used to connect and shut off the fluid passage 5 and the fluid passage 6. When the actuator 3 is energized based on a command from an electronic control unit (not shown), the valve chamber 10 above the fluid passage 6 The fluid passage 5, the fluid passage 6, and the fluid passage 7 are separated from the provided valve seat 11 and communicate with each other. When the actuator 3 is not energized, the actuator 3 comes into contact with the valve seat 11 and shuts off between the fluid passage 5 and the fluid passage 6. FIG. 6 shows a state in which the rod valve 4 blocks the fluid passage 5 from the fluid passage 6. Further, the actuator 3, the rod valve 4, the valve chamber 10, and the valve seat 11 constitute a solenoid valve SOV described in claims.

The valve body 2 is provided with a bypass valve BPV. The bypass valve BPV is for opening and closing a bypass 13 provided between the fluid passage 5 and the fluid passage 7, and is attached to a valve seat 15 provided at an upper end of the valve chamber 14 and attached to the valve seat 15. It includes a check ball 16 that comes in contact with and separates therefrom, a return spring 17 that urges the check ball 16 in a direction that closes the bypass 13, and a spring holder 18 that elastically attaches the return spring 17. In the bypass valve BPV having the above-described configuration, the rod valve 4 has the fluid passage 5,
When the fluid pressure supplied from the screw hole 8 side is higher than the fluid pressure in the screw hole 9 by a predetermined pressure or more in a state where the gap between the screw holes 6 is shut off, the check ball 16 is pushed down against the urging force of the return spring 17. Can be Thus, even when the rod valve 4 blocks the fluid passages 5 and 6, the fluid passage 5, the bypass 13, and the fluid passage 7 are communicated with each other. For example, when the driver depresses the brake pedal, the vehicle The hydraulic pressure supplied from the master cylinder of the wheel braking device is supplied to the wheel cylinder.

The relief valve LFV includes a check ball 35 that comes in contact with and separates from a valve seat 34 provided in a valve chamber 33, and a return spring 36 that urges the check ball 35 in a direction to close the relief port 31.
And a spring holder 37 on which the return spring 36 is elastically attached.

Next, when the driver depresses the brake pedal, the hydraulic pressure from the master cylinder is supplied to the wheel cylinder, and the fluid having the above-described structure is supplied to the hydraulic pressure supply passage in the wheel braking device of the vehicle that operates the wheel brake. The operation of the vehicle parking device inserted with the passage opening / closing valve 1c will be described. The screw hole 8 of the fluid passage opening / closing valve 1c has
The pipe connected to the master cylinder is connected, and the screw hole 9
Is connected to a pipe connected to the wheel cylinder.

First, the operation when the vehicle is parked will be described. In a state where the vehicle is normally stopped after traveling, the actuator 3 is energized by a command from an electronic control unit (not shown), so that the rod valve 4 is retracted, and the fluid passages 5, 6, and 7 are opened. When the driver depresses the brake pedal, the hydraulic pressure from the master cylinder is applied to the fluid passages 5, 6, 7
Is supplied to the wheel cylinder via the wheel to operate the wheel brake. In this state, when the driver depresses the brake pedal and operates the parking switch to the parking lock side, the electronic control unit issues a parking lock command based on signals from a vehicle speed sensor (not shown), a brake pedal on / off sensor, and a parking on / off sensor. Since the power is transmitted to the actuator 3 to stop the supply of electricity to the actuator 3, the rod valve 4 is protruded to close the fluid passages 5 and 6, so that the hydraulic pressure supply passage of the wheel braking device is shut off and the fluid is supplied to the wheel cylinder. Since the high hydraulic pressure is maintained, the operation of the wheel brake is continued, and the vehicle enters the parking state. In this state, since the hydraulic pressure on the wheel cylinder side is higher than the hydraulic pressure on the master cylinder side, the bypass valve BPV closes the bypass 13.

Here, the operation of the above-described relief valve LFV will be described. As described above, if the fluid pressure on the wheel cylinder side is maintained at a high state for a long time, the durability of the brake hose, the rubber cup of the brake cylinder, the brake fluid, and the like may be adversely affected. Therefore, when the hydraulic pressure on the wheel cylinder side exceeds the set pressure, the relief valve LFV
The check ball 35 is pressed against the urging force of the check valve 35, and the check ball 35 is separated from the valve seat 34 so that the relief port 31, the fluid passage 32, and the fluid passage 5 communicate with each other. FIG. 7 shows this state. As shown in FIG. 7, when the relief port 31, the fluid passage 32, and the fluid passage 5 communicate with each other, the high hydraulic pressure on the wheel cylinder side causes the fluid passage 7, the relief port 31, the fluid passage 32, and the fluid passage 5 to communicate with each other. Through to the master cylinder side. When the hydraulic pressure on the wheel cylinder side decreases to the set pressure, the hydraulic pressure applied to the check ball 35 decreases, so that the urging force of the return spring 36 becomes relatively strong and the check ball 35 is moved to the valve seat 34. Let it come in contact. As a result, the hydraulic pressure on the wheel cylinder side is adjusted to the set pressure, so that the life of the brake hose, the rubber cup of the brake cylinder, the brake fluid, and the like can be extended.

Next, the operation of releasing the parking state of the vehicle and enabling the vehicle to travel will be described. When the driver turns on the key switch and operates the parking switch to the parking release side, the electronic control unit issues a parking release command based on a signal from the parking on / off sensor, energizes the actuator 3, and supplies the rod valve 4. And the fluid passages 5, 6, 7 are communicated.
When the fluid passages 5, 6, and 7 are communicated, the communication between the master cylinder and the wheel cylinder is established, so that the hydraulic pressure on the wheel cylinder side is reduced, and the operation of the wheel brake is released. Can be done. Then, each time the driver depresses the brake pedal during traveling, the wheel brake is activated, and the vehicle can be braked freely.

If the power supply to the actuator 3 is stopped during running of the vehicle due to some kind of erroneous operation, failure of the power supply, or the stop function of the electronic control unit, the rod valve 4 closes the space between the fluid passages 5 and 6. In this state, when the driver steps on the brake, the high hydraulic pressure from the master cylinder is applied to the check ball 16 of the bypass valve BPV through the bypass 13, so that the check ball 16 is pushed down and the fluid passage 5 , Bypass 13 and fluid passage 7 are communicated. As a result, the hydraulic pressure from the master cylinder is supplied to the wheel cylinder via the fluid passage 5, the bypass 13, and the fluid passage 7, so that the wheel brake operates and the vehicle can be braked. Since the bypass valve BPV is provided in this manner, the vehicle can be safely braked even when the actuator 3 is de-energized during running of the vehicle due to some kind of erroneous operation, power supply failure, or stop function of the electronic control unit. Can be.

The fluid passage opening / closing valves 1, 1 of the above embodiment
The solenoid valves a, 1b, and 1c are of an electromagnetic type in which the solenoid valve SOV is operated by energizing the actuator 3, and the rod valve 4 is manually opened and closed using a cable or a link mechanism instead of the solenoid valve SOV. You may do it. If the fluid passage opening / closing valve is configured as a manual type as described above, the cost is reduced.

[0036]

As described above, according to the present invention, when the driver depresses the brake pedal, the hydraulic pressure from the master cylinder is supplied to the wheel cylinder, and the hydraulic pressure of the wheel braking device of the vehicle for operating the wheel brake is increased. If it is installed in the pressure supply passage, the vehicle can be safely braked by the driver's brake operation even if the energization is stopped during driving due to any erroneous operation, power supply failure, or stoppage of the function of the electronic control device. There is an effect that can be.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a fluid passage on-off valve according to a first embodiment.

FIG. 2 is a sectional view of a fluid passage on-off valve according to a second embodiment.

FIG. 3 is a sectional view of a fluid passage on-off valve according to a third embodiment.

FIG. 4 is a cross-sectional view illustrating an operation state of a fluid passage on-off valve according to a third embodiment.

FIG. 5 is a cross-sectional view illustrating an operation state of a fluid passage on-off valve according to a third embodiment.

FIG. 6 is a cross-sectional view of a fluid passage on-off valve according to a fourth embodiment.

FIG. 7 is a cross-sectional view illustrating an operation state of a fluid passage on-off valve according to a fourth embodiment.

FIG. 8 is a sectional view of a conventional fluid passage opening / closing valve.

[Explanation of symbols]

 1, 1a, 1b, 1c Fluid passage opening / closing valve 2 Valve body 3 Actuator 4 Rod valve 5, 6, 7, 7a Fluid passage 8, 9 Screw hole 13 Bypass 31 Relief port SOV solenoid valve BPV Bypass valve LFV Relief valve

Claims (10)

[Claims] 1. A solenoid valve provided in a valve body for opening and closing a fluid passage, and a bypass valve provided in the valve body for opening and closing a bypass, wherein the solenoid valve bypasses the fluid passage when energized. Opened irrespective of the opening and closing of the valve, supply the hydraulic pressure supplied from the supply side to the operating side, and close the fluid passage when the power is not supplied. When the hydraulic pressure is higher than the hydraulic pressure, the bypass is opened to supply the hydraulic pressure to the operating side, and when the hydraulic pressure on the supply side is lower than the hydraulic pressure on the operating side, the bypass is closed. Characteristic fluid passage opening / closing valve. 2. The valve body according to claim 1, wherein the valve body has a substantially rectangular shape.
2. The fluid passage opening / closing valve according to claim 1, wherein the 0 degree rotation shape is the same. 3. The valve body according to claim 1, wherein the valve body is provided with mounting screw holes of respective pipes connected to the supply side and the operating side and respective passage holes communicating with the mounting screw holes on the same side surface. The fluid passage opening / closing valve according to any one of the preceding claims. 4. When the driver depresses a brake pedal, a hydraulic pressure from a master cylinder is supplied to a wheel cylinder, and the hydraulic pressure is used to open or close a hydraulic pressure supply passage of a wheel braking device for operating a wheel brake. The fluid passage opening / closing valve according to claim 1, which constitutes a vehicle parking device. 5. The valve body, wherein when mounted on an engine room partition plate or the like of a vehicle, the solenoid valve is disposed above the valve body, and the valve body is pipeable in a horizontal direction with a master cylinder disposed at substantially the same height. A pipe mounting screw hole on the hydraulic pressure supply side is formed on the lateral side of the valve cylinder, and a pipe mounting screw hole on the hydraulic pressure operation side is provided on the lower surface of the valve body that can be piped in a substantially vertical direction with a wheel cylinder arranged near the ground. 5. The device according to claim 4, wherein
3. The fluid passage opening / closing valve according to claim 1. 6. A solenoid valve for opening and closing a fluid passage provided in a valve body, a bypass valve for opening and closing a bypass provided in the valve body, and a relief valve for opening and closing a relief port provided in the valve body. The solenoid valve, when energized, opens the fluid passage regardless of opening and closing of the bypass valve and the relief valve, supplies the fluid pressure supplied from the supply side to the operation side, and disconnects the fluid passage when not energized. Closing, the bypass valve opens the bypass when the hydraulic pressure on the supply side is higher than the hydraulic pressure on the operating side and supplies the hydraulic pressure to the operating side, and the hydraulic pressure on the supply side is The bypass is closed when the hydraulic pressure is lower than the hydraulic pressure on the operating side, and the relief valve is configured such that the hydraulic pressure on the operating side is higher than the hydraulic pressure on the supply side. And a fluid that opens the relief port when the hydraulic pressure on the operating side exceeds a set pressure, relieves the hydraulic pressure on the operating side to the supply side and regulates the pressure to the set pressure. Passage open / close valve. 7. The valve body unifies the shape of each part constituting the solenoid valve, the bypass valve, and the relief valve, and sets each mounting screw hole of each pipe connected to the supply side and the operation side. 7. The fluid passage opening / closing valve according to claim 6, wherein dimensions of the passage holes communicating with the passage holes are unified. 8. When the driver depresses a brake pedal, a hydraulic pressure from a master cylinder is supplied to a wheel cylinder, and the hydraulic pressure is used to open or close a hydraulic pressure supply passage of a wheel braking device for operating a wheel brake. The fluid passage opening / closing valve according to claim 6, which constitutes a vehicle parking device. 9. The fluid passage opening / closing valve according to claim 1, wherein the solenoid valve is a manual valve using a cable or a link mechanism. 10. When the driver depresses a brake pedal, hydraulic pressure from a master cylinder is supplied to a wheel cylinder, and the hydraulic pressure is used to open or close a hydraulic pressure supply passage of a wheel braking device for operating a wheel brake. The fluid passage opening / closing valve according to claim 9, which constitutes a vehicle parking device.