JPH0539050A - Flow passage selecting valve device for actuator - Google Patents

Abstract

(57) [Abstract] [Purpose] When the actuator of the power steering device is in the neutral position, it does not move even if external force is applied to the actuator. [Structure] Center tank port 1 that connects to tank 15
1st and 2nd pump ports 18 and 2 on both sides centering on 6
1, 1st, 2nd cylinder ports 19, 22, 1st, 2nd
In order of tank ports 20 and 23 or first and second cylinder ports 19 and 22, first and second pump ports 18 and 21,
The first and second tank ports 20 and 23 are provided in this order, and in the neutral position, the first and second pump ports 18 and 21 are provided only in the center tank port 16 or in the first and second tank ports 2.
Only 0 and 23 are connected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow path switching valve device for an actuator such as a power steering device used for ships and vehicles.

[0002]

2. Description of the Related Art In a power steering device for an inboard motor and an outboard motor, a spool valve is fitted in an assembly hole formed in a valve case so as to be movable in an axial direction or a circumferential direction, and A flow passage switching valve device is used in which land portions formed on the inner and outer circumferences of the spool valve are provided, and the flow passages are switched between supply and discharge of hydraulic oil to and from the actuator between these land portions.

As such a valve device, for example, as described in Japanese Utility Model Laid-Open No. 1-132498, a first cylinder port communicating with a first cylinder chamber of an actuator is provided on one side of a pump port communicating with a hydraulic pump. There is one in which a first tank port communicating with the tank is sequentially provided, and a second cylinder port communicating with the second cylinder chamber of the actuator and a second tank port communicating with the tank are sequentially provided.

In this valve device, when the spool valve moves to one side, the pump port moves to the second position.
When the first cylinder port communicates with the first cylinder port, the first tank port communicates with the first tank port, and the total length of the actuator shortens, and the spool valve moves to the other side, the pump port communicates with the first cylinder port and the second cylinder port. Communicates with the second tank port to extend the entire actuator length.

[0005]

However, in the flow path switching valve device as described above, when the actuator is in the neutral position, the pump ports have the first and second pump ports.
Since it is in communication with the cylinder port and the first and second tank ports, the hydraulic fluid discharged from the hydraulic pump smoothly returns to the tank and the same pressure is applied to the first and second cylinder chambers of the actuator. However, if an external force is input to the actuator, the pressure balance will be lost and the actuator will move, making the operation unstable.

[0006]

[Means for Solving the Problems] In order to solve the above problems,
According to a first aspect of the present invention, in a valve device for switching a flow path of a working fluid to a first cylinder chamber and a second cylinder chamber in an actuator defined by a piston, the valve device is an assembly formed in a valve case. The spool valve is fitted in the hole so as to be movable in the axial direction or the circumferential direction, and the groove portion and the land portion are formed on the outer peripheral surface of the spool valve and the inner peripheral surface of the case facing the outer peripheral surface. A first pump port and a second pump port for supplying the working fluid from the pump to the groove, a first tank port for returning the working fluid to the tank, a second tank port, and a center tank port in the groove or land formed on the peripheral surface. , A first cylinder port and a second cylinder port for supplying and discharging a working fluid to and from the first cylinder chamber and the second cylinder chamber, respectively. When the spool valve is in the neutral position, only the first pump port and the second pump port communicate with the center tank port, and the spool valve moves from the neutral position to the first pump port. One of the port and the second pump port and the first
A configuration in which one of the cylinder port and the second cylinder port communicates with each other, and the other of the first cylinder port and the second cylinder port communicates with one of the first tank port and the second tank port, and the other ports do not communicate with each other. And In the invention described in claim 2, the center tank port communicating with the tank, the first pump port communicating with the hydraulic pump on one side centering on the center tank port, and the first cylinder chamber of the actuator are communicated. One cylinder port, a first tank port communicating with the tank are provided in order, and a second pump port communicating with the hydraulic pump on the other side, a second cylinder port communicating with the second cylinder chamber of the actuator, and a second communicating with the tank. Two tank ports are provided in order, and when the actuator is in the neutral position, the first and second pump ports are communicated only with the center tank port. In the invention of claim 3, the order of providing the above ports is the cylinder port. , Pump port, tank port and the actuator in the neutral position Was the first, as the second pump port is communicated only to the first, second tank port.

[0007]

When the actuator is set to the neutral position, for example, the first and second pump ports communicate with only the center tank port, the first and second cylinder ports do not communicate with the pump port and the tank port, and the actuator receives an external force. The actuator does not move even when input.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, FIG. 1 is a schematic plan view of a ship equipped with a power steering device to which the present invention is applied, and FIG. 2 is a cross section of the power steering device at a neutral position of a flow path switching valve device to which the invention of claim 1 is applied. FIG. 3 is a sectional view of the valve device in an operating position, FIG. 4 is a sectional view of the flow path switching valve device in the neutral position of the invention of claim 2, and FIG. 5 is an operating position of the valve device. 6 is a sectional view of another embodiment of the flow path switching valve device to which the invention of claim 1 is applied, and FIG. 7 is a cross section of another embodiment of the flow path switching valve device to which the invention of claim 2 is applied. It is a figure.

A steering handlebar 2 is provided substantially in the center of the hull 1, and a transom unit 3 is provided at the rear of the hull 1.
The propulsion unit 4 is swingably mounted in the horizontal plane via. Then, the movement of the steering handle 2 is transmitted to the steering cable 6 via the rack and pinion mechanism 5, and the movement of the steering cable 6 is transmitted to the cylinder unit 7 which is an actuator for steering.

In the cylinder unit 7, a piston 9 is slidably fitted in a cylinder 8 to define two oil chambers, a first cylinder chamber S1 and a second cylinder chamber S2, and the piston 9 is propelled. A rod 10 for connecting the tip portion is fixed to the arm 4a of the unit 4.

A passage switching valve device 11 for supplying / discharging hydraulic oil to / from the cylinder unit 7 has a mounting hole 13 formed in a valve case 12, and the mounting hole 13 is formed.
The spool valve 14 is fitted inside so as to be slidable in the axial direction,
This spool valve 14 is connected to the steering cable 6
Move with to switch the flow path.

Grooves and lands are formed on the inner peripheral surface of the bubble case 12 and the outer peripheral surface of the spool valve 14 facing the inner peripheral surface of the bubble case 12, and the groove or land formed on the inner peripheral surface of the bubble case 12 is connected to the tank 15. The center tank port 16 communicating with the first pump port 18 communicating with the hydraulic pump 17 on one side with the center tank port 16 as the center, and the first cylinder chamber S1 of the cylinder unit 7.
A first cylinder port 19 communicating with the tank 15, a first tank port 20 communicating with the tank 15 in order, and a second pump port 21 communicating with the hydraulic pump 17 on the other side.
A second cylinder port 22 communicating with the second cylinder chamber S2 of the cylinder unit 7 and a second tank port 23 communicating with the tank 15 are sequentially provided.

When the flow path switching valve device 11 is set to the neutral position, the first and second pump ports 18 and 21 communicate only with the center tank port 16 as shown in FIG.
The hydraulic oil that the hydraulic pump 17 sucks in and discharges from the tank 15 smoothly returns to the tank 15 from the first and second pump ports 18 and 21 via the center tank port 16. At this time, the first cylinder port 19 does not communicate with the first pump port 18 and the first tank port 20,
Since the cylinder port 22 also does not communicate with the second pump port 21 and the second tank port 23, the cylinder unit 7
Even if an external force is input to the rod 10, the hydraulic oil in the first cylinder chamber S1 and the second cylinder chamber S2 of the cylinder unit 7 can hardly escape, and the cylinder unit 7 does not operate.

When the spool valve 14 moves to one side, for example, to the left as shown in FIG. 3, the second pump port 21 and the second cylinder port 2 are moved.
2. The first cylinder port 19 and the first tank port 20 communicate with each other, and the hydraulic oil discharged from the hydraulic pump 17 is passed through the second pump port 21 and the second cylinder port 22 to the second cylinder chamber S2 of the cylinder unit 7. The hydraulic oil that is supplied into the first cylinder chamber S1 of the cylinder unit 7 is supplied to the first cylinder port 19 and the first tank port 20.
Returning to the tank 15 via, the rod 10 of the cylinder unit 7 moves in the arrow direction (the contracting direction).

Further, when the spool valve 14 moves to the other side, for example, to the right, the first pump port 18 and the first cylinder port 19 and the second cylinder port 22 and the second tank port 23 communicate with each other. , The hydraulic oil discharged from the hydraulic pump 17 to the first pump port 1
8 and the first cylinder port 19 into the first cylinder chamber S1 of the cylinder unit 7, and the hydraulic oil in the second cylinder chamber S2 of the cylinder unit 7 flows through the second cylinder port 22 and the second tank port 23. Through the tank 15
Then, the rod 10 of the cylinder unit 7 moves in the extending direction.

Next, the flow path switching valve device 31 shown in FIGS. 4 and 5 has a center tank port 16 communicating with the tank 15 and the first cylinder of the cylinder unit 7 on one side centering on the center tank port 16. A first cylinder port 19 communicating with the chamber S1, a first pump port 18 communicating with the hydraulic pump 17, and a first cylinder port 19 communicating with the tank 15.
The tank ports 20 are provided in order, and on the other side, a second cylinder port 22 that communicates with the second cylinder chamber S2 of the cylinder unit 7, a second pump port 21 that communicates with the hydraulic pump 17, and a second tank port that communicates with the tank 15. 23 are provided in order. That is, the positional relationship between the cylinder port and the pump port is reversed from that of the valve device 11.

When the flow path switching valve device 31 is set to the neutral position, as shown in FIG. 4, only the first and second pump ports 18 and 21 communicate with the first and second tank ports 20 and 23, and the hydraulic pump The hydraulic oil that 17 sucks and discharges from the tank 15 smoothly returns to the tank 15 from the first and second pump ports 18 and 21 via the first and second tank ports 20 and 23. At this time, the first cylinder port 19 does not communicate with the center tank port 16 and the first pump port 18, and the second cylinder port 22 also does not communicate with the center tank port 16 and the second pump port 21. Even if an external force is input to 10, the hydraulic oil in the first cylinder chamber S1 and the second cylinder chamber S2 of the cylinder unit 7 can hardly escape, and the cylinder unit 7 does not operate.

When the spool valve 14 moves to one side, for example, to the right as shown in FIG. 5, the second pump port 21 and the second cylinder port 2 are moved.
2, 1st cylinder port 19 and center tank port 1
6 communicate with each other, and hydraulic oil discharged from the hydraulic pump 17 is supplied to the second pump port 21 and the second cylinder port 22.
Is supplied to the second cylinder chamber S2 of the cylinder unit 7 through the first cylinder chamber S1 and the hydraulic oil in the first cylinder chamber S1 of the cylinder unit 7 returns to the tank 15 through the first cylinder port 19 and the center tank port 16, The rod 10 of the unit 7 moves in the arrow direction (the contracting direction).

Further, when the spool valve 14 moves to the other side, for example, to the left, the first pump port 18 and the first cylinder port 19, and the second cylinder port 22 and the center tank port 16 communicate with each other, The hydraulic oil discharged from the hydraulic pump 17 is supplied into the first cylinder chamber S1 of the cylinder unit 7 via the first pump port 18 and the first cylinder port 19, and the hydraulic oil in the second cylinder chamber S2 of the cylinder unit 7 is supplied. Returns to the tank 15 via the second cylinder port 22 and the center tank port 16 and moves in the direction in which the rod 10 of the cylinder unit 7 extends.

Next, the flow path switching valve devices 41 and 51 of the respective other embodiments shown in FIGS. 6 and 7 are of the rotary type in which the spool valve 14 is rotatably fitted in the mounting hole 13 of the valve case 12. The flow passage switching valve device 41 is a valve device, and the configuration and operation of the flow passage switching valve device 41 are the same as those of the valve device 11 shown in FIGS. 2 and 3 described above. The valve device 31 is the same as the valve device 31 shown in FIG.

[0021]

As described above, according to the present invention,
The first and second pump ports, the first and second cylinder ports, the first and second tank ports, or the first and second cylinder ports, the first and the second tank ports are arranged on both sides of the center tank port communicating with the tank. Two pump ports, first and second tank ports are provided in this order, and in the neutral position, the first and second pump ports are only the center tank port or the first and second pump ports are only the first and second tank ports. Since they are made to communicate with each other, the first and second cylinder ports are not communicated with the pump port and the tank port, and the actuator does not move even if an external force is input to the actuator.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a ship equipped with a power steering device to which the present invention is applied.

FIG. 2 is a cross-sectional view of the power steering device at the neutral position of the flow path switching valve device to which the invention of claim 1 is applied.

FIG. 3 is a sectional view of the valve device in an operating position.

FIG. 4 is a sectional view of the flow path switching valve device to which the invention of claim 2 is applied, in a neutral position.

FIG. 5 is a sectional view of the valve device in an operating position.

FIG. 6 is a sectional view of another embodiment of the flow path switching valve device to which the invention of claim 1 is applied.

FIG. 7 is a sectional view of another embodiment of the flow path switching valve device to which the invention of claim 2 is applied.

[Explanation of symbols]

7 ... Cylinder unit (actuator), 11, 3
1, 41, 51 ... Flow path switching valve device, 12 ... Valve case, 13 ... Mounting hole, 14 ... Spool valve, 15 ...
Tank, 16 ... Center tank port, 17 ... Hydraulic pump, 18 ... First pump port, 19 ... First cylinder port, 20 ... First tank port, 21 ... Second pump port, 22 ... Second cylinder port, 23 ... 2nd tank port, S1 ... 1st cylinder chamber, S2 ... 2nd cylinder chamber.

Claims (3)

[Claims] 1. A valve device for switching a flow path of a working fluid to a first cylinder chamber and a second cylinder chamber in an actuator defined by a piston, the valve device being in an assembly hole formed in a valve case. A spool valve is fitted to the shaft valve so as to be movable in the axial direction or the circumferential direction, and a groove portion and a land portion are formed on the outer peripheral surface of the spool valve and the inner peripheral surface of the case facing the outer peripheral surface. The first or second pump port for supplying the working fluid from the pump to the groove, the first tank port for returning the working fluid to the tank, the second tank port or the center tank port, Open the first cylinder port and the second cylinder port for supplying / discharging the working fluid to / from the first cylinder chamber and the second cylinder chamber, respectively. In the neutral position of the spool valve, only the first pump port, the second pump port and the center tank port communicate with each other, and the spool valve moves from the neutral position to the first pump port. And one of the second pump port and one of the first cylinder port and the second cylinder port communicate with each other, and the other of the first cylinder port and the second cylinder port and one of the first tank port and the second tank port A flow path switching valve device for an actuator, which is configured so as to communicate with each other and other ports not to communicate with each other. 2. The center tank port is arranged at the center of each port, and the first pump port and the second pump port are arranged on the left and right in the axial direction or the circumferential direction centering on the center tank port.
A pump port is disposed, and a first cylinder port and a second pump port are provided outside the first pump port and the second pump port.
A flow path switching valve device for an actuator, wherein a cylinder port is arranged, and further, a first tank port and a second tank port are arranged outside the first cylinder port and the second cylinder port. 3. The center tank port is arranged at the center of each port, and a first cylinder port and a second cylinder port are arranged on the left and right in the axial direction or the circumferential direction with the center tank port as the center, and the first cylinder port and the second cylinder port are arranged. The first pump port and the second pump port are arranged outside the cylinder port and the second cylinder port, and the first tank port and the second tank port are arranged outside the first pump port and the second pump port. A flow path switching valve device for an actuator characterized by the above.