JP3307666B2 - Actuator switching valve device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a flow path switching valve device such as a power steering used to ship.

[0002]

2. Description of the Related Art In a power steering apparatus for an inboard motor and an outboard motor, as shown in FIG. 5, a rod 102 of a hydraulic cylinder unit 101 as an actuator passes through a steering shaft 104 via a clevis 103. A flow path switching valve device that connects to the core 105a of the steering cable 105 and switches between supply and discharge of the working fluid to the first cylinder chamber S1 and the second cylinder chamber S2 defined by the piston 106 of the hydraulic cylinder unit 101. 110 is provided.

In this flow switching valve apparatus 110, a spool valve 112 is fitted in a valve case 111 so as to be movable in the axial direction. The spool valve 112 is connected to a steering shaft 104 via connecting means 113.
Further, the inner peripheral surface of the valve case 111 and the spool valve 112
A land portion is formed on the outer peripheral surface, and a working fluid is supplied from a pump 115 by moving a spool valve 112 in the valve case 111.
The flow path for returning the working fluid to 16 is switched.

In the flow path switching valve device 110 , when the spool valve 112 is at a neutral position in the drawing, the first cylinder chamber S of the hydraulic cylinder unit 101 is moved.
1. Second cylinder chamber S2, pump 115, tank 116
Are in communication with each other, and the working fluid discharged from the pump 115 is supplied to the tank 11 via the switching valve device 110.
It has been returned to 6.

[0005]

However, when the actuator is at the neutral position as in the above-described flow path switching valve device, the pump, the tank, and the first and second cylinder chambers of the actuator are in communication with each other. Then, the working fluid discharged from the pump smoothly returns to the tank, and the same pressure is applied to the first and second cylinder chambers of the actuator. Therefore, the actuator does not move, but when an external force is input to the rod of the actuator, the pressure balance is maintained. Is broken and the actuator moves, so that, for example, if the hand is released from the handle during traveling, a drift phenomenon occurs in which the handle moves.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a working fluid from a spool valve side to each cylinder chamber in a supply oil passage communicating with a first cylinder chamber and a second cylinder chamber of an actuator. only set a check valve for allowing only the flow, the discharge oil path communicating with the tank from the cylinder chambers, Rutotomoni provided a pilot check valve to open the oil discharge passage by the movement of the spool valve, the pilot
Check valve, valve case for storing spool valve
Provided integrally .

[0007]

When the actuator is in the neutral position, a check is made to allow only the flow of the working fluid from the spool valve side provided in the supply oil passage communicating with the first cylinder chamber and the second cylinder chamber of the actuator to each cylinder chamber. Since the flow of the working fluid from the cylinder chamber side to the spool valve side is prohibited by the action of the valve, the rod of the actuator is locked and does not operate due to external force, and each cylinder moves when the spool valve moves. The discharge oil passage is opened by the pilot check valve provided in the discharge oil passage communicating from the chamber to the tank, so that the actuator can be operated.

[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 provided with a flow path switching valve device of a power steering device to which the present invention is applied, FIG. 2 is a cross-sectional view of the valve device at a neutral position, and FIG. FIG. 4 is a cross-sectional view of the valve device in another operation position.

At the rear of the hull 1, an outboard motor 2 is supported rotatably in a horizontal direction about a vertical axis, and a power steering device 3 for steering the outboard motor 2 is provided at the rear of the hull.
The power steering device 3 and the steering wheel 4 are connected via a steering cable 5 and a steering shaft 6. The power steering device 3 is a block 7
A hydraulic cylinder unit 8 as an actuator and a flow path switching valve device 9 for switching supply / discharge of a working fluid to / from the hydraulic cylinder unit 8 are provided therein.

The hydraulic cylinder unit 8 includes a cylinder 11
The piston 12 is slidably fitted therein to define a first cylinder chamber S1 and a second cylinder chamber S2, which are two oil chambers, and a rod 13 is fixed to the piston 12, and the rod 13 is a clevis. It is connected to the core 5a of the steering cable 5 which passes through the steering shaft 6 via.

A flow path switching valve device 9 for supplying / discharging hydraulic oil to / from the hydraulic cylinder unit 8 has a spool valve 22 fitted in a valve case 21 so as to be movable in the axial direction. It is connected to the steering shaft 6 by connecting means 23.

A groove and a land are formed on the inner peripheral surface of the valve case 21 and the outer peripheral surface of the spool valve 22 opposed thereto, and the groove or land formed on the inner peripheral surface of the valve case 21 is provided with the pump 25. The pump port 26 which communicates with the first and second tank ports 28 and 29 which communicates with the tank 27, and the first and second cylinder chambers S1 and S2 of the hydraulic cylinder unit 8 communicate with the respective cylinder chambers S1 and S2.
And first and second cylinder supply ports 30 and 31 serving as ports for supplying a working fluid to the cylinder.

A flow switching valve device is provided in a supply oil passage communicating from the first and second cylinder supply ports 30 and 31 of the valve case 21 to the first and second cylinder chambers S1 and S2 of the hydraulic cylinder unit 8. From the 9 side, each cylinder chamber S
Check valves 32 and 33 are provided to allow only the flow of the working fluid to S1 and S2.

Further, both side chambers 34 in the valve case 21,
35 to the tank 27, and to the first and second cylinder chambers S1 and S2 of the hydraulic cylinder unit 8 (the check valves 32 and 33 control the cylinder chambers S1 and S2).
More to connect. ) To form a discharge oil passage from each of the cylinder chambers S1 and S2 to the tank 27. Further, when the spool valve 22 moves into both side chambers 34 and 35 in the valve case 21 in the discharge oil passage. Open pilot check valves 38 and 39 are provided.

The first and second hydraulic cylinder units 8
The discharge oil passages of the cylinder chambers S1 and S2 bypass the pilot check valves 38 and 39 and are connected to the tank 27 via thermal valves 41 and 42.

The operation of the flow path switching valve device 9 configured as described above will be described. First, the valve device 9
When the spool valve 22 of FIG.
, The pump port 26, the first and second tank ports 28 and 29, the first and second cylinder supply ports 30, 3
1 is opened, the first and second cylinder chambers S1 and S2 of the hydraulic cylinder unit 8 have the same pressure, and the working fluid discharged from the pump 25 returns to the tank 27 as it is via the valve device 9. Have been.

At this time, in the oil supply passage to the first and second cylinders S1 and S2 of the hydraulic cylinder unit 8, a check is made to allow only the flow of the working fluid from the valve device 9 side to each of the cylinder chambers S1 and S2. Since the valves 32 and 33 are provided, the working fluid does not flow into the valve device 9 from the cylinder chambers S1 and S2, and the spool valve 22
Are not moving, so pilot check valves 38, 39
Is closed, the working fluid cannot flow from the cylinder chambers S1 and S2 of the hydraulic cylinder unit 8 to the tank 27. Therefore, even if an external force is applied to the rod 13 of the hydraulic cylinder unit 8, the hydraulic cylinder unit 8 operates. do not do.

Next, as shown in FIG. 3, when the steering shaft 6 is operated in the direction of the arrow, the spool valve 22 also moves in the direction of the arrow so that only the pump port 26 and the first cylinder supply port 30 are in communication. Therefore, the working fluid from the pump 25 is supplied to the first cylinder chamber S1 of the hydraulic cylinder unit 8 by pushing and opening the check valve 32 from the pump port 26 and the first cylinder supply port 30 while the spool valve 22 moves. Since the pilot check valve 39 opens to open the oil discharge passage from the second cylinder chamber S2 to the tank 27, the working fluid in the second cylinder chamber S2 is returned to the tank 27 via the pilot check valve 39. Therefore, the hydraulic cylinder unit 8
Moves in the direction indicated by the arrow (extending direction).

When the steering shaft 6 is operated in the direction of the arrow as shown in FIG. 4, the spool valve 22 also moves in the direction of the arrow, and only the pump port 26 and the second cylinder supply port 31 are in communication. Therefore, the working fluid from the pump 25 pushes and opens the check valve 33 from the pump port 26 and the second cylinder supply port 31 to be supplied into the second cylinder chamber S2 of the hydraulic cylinder unit 8, while the pilot valve is moved by the movement of the spool valve 22. Since the check valve 38 opens to open the discharge oil passage from the first cylinder chamber S1 to the tank 27, the working fluid in the first cylinder chamber S1 is returned to the tank 27 via the pilot check valve 38. Therefore, the hydraulic cylinder unit 8
Move in the direction indicated by the arrow (the direction in which it contracts).

[0020]

According to the present invention as described above,
A check valve is provided in the supply oil passage communicating with the first cylinder chamber and the second cylinder chamber of the actuator to allow only the flow of the working fluid from the spool valve side to each cylinder chamber.
In the discharge oil passage communicating from each cylinder chamber to the tank ,
Rutotomoni provided a pilot check valve to open the oil discharge passage by the movement of the spool valve, check pilot
The valve is integrated with the valve case that houses the spool valve
Since there is provided the actuator is when in the neutral position, since the flow of hydraulic fluid from the cylinder chamber side of the actuator to the spool valve side is prohibited, the actuator that eliminates move even if an external force to the actuator is input.

[Brief description of the drawings]

FIG. 1 shows the flow of a power steering device to which the present invention is applied.
Schematic plan view of a ship provided with a road switching valve device

FIG. 2 is a cross-sectional view of the valve device at a neutral position.

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

FIG. 4 is a sectional view of the valve device in another operating position.

FIG. 5 is a sectional view of a conventional flow path switching valve device.

[Explanation of symbols]

8 ... Hydraulic cylinder unit (actuator), 9 ... Flow
Road switching valve device , 21: valve case, 22: spool valve, 25: pump, 26: pump port, 27 ...
Tank, 28 first tank port, 29 second tank port, 30 first cylinder supply port, 31 second cylinder supply port, 32, 33 check valve, 38, 39
... Pilot check valve, S1 ... First cylinder chamber, S2
... Second cylinder chamber.

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B63H 25/22 B62D 5/00-5/32

Claims (1)

(57) [Claims] 1. A flow path disconnection 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 by moving a spool valve.
In conversion valve device, wherein the first supply oil path communicating with the cylinder chamber and a second cylinder chamber, only setting a check valve for allowing only flow of hydraulic fluid to the cylinder chambers from the spool valve side, the cylinder chambers the discharge oil path communicating with the tank from Rutotomoni provided a pilot check valve to open the oil discharge passage by the movement of the spool valve, the pilot
The check valve and the valve case that houses the spool valve.
A flow path switching valve device for an actuator, wherein the valve device is provided integrally with the actuator.