JP2001141103A - Manual operation valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remotely operate a manual operation valve HV. SOLUTION: The turning member 23 is inclined by connecting pull wires 25, 25 to a turning member 23 and pulling the pull wires, thereby switching the manual operation valve.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manually operated valve most suitable for controlling a pilot pressure of a pilot operated valve, for example.

[0002]

2. Description of the Related Art A conventionally known manually operated valve is switched by using an operation lever.

[0003]

When the operation lever is provided on the manually operated valve as described above, the mounting position of the manually operated valve is restricted by the operation lever. For example, in a construction vehicle, in order to provide an operating lever near an operator, it must be installed near a driver's seat. However, near the driver's seat, the main parts such as the engine are densely packed, so that the mounting space is extremely limited.

[0004] When the manually operated valve is installed in such a limited space, it is absolutely necessary to force the piping. If the pipe is forcibly forced as described above, the pipe may be bent. However, an extremely bent pipe may cause damage to the pipe. Further, even if the pipe is not damaged, there arises a problem that the flow resistance increases and the pressure loss increases. SUMMARY OF THE INVENTION An object of the present invention is to provide a manually operated valve which enables manual remote control and can be installed anywhere.

[0005]

According to the present invention, a plunger and a spool are arranged in series on the same axis, and the plunger is pushed in by tilting a rotating member.
It is assumed that a manually operated valve switches the spool in accordance with the amount of movement of the plunger, that is, the amount of inclination of the rotating member. On the premise of the above-mentioned manually operated valve, the present invention is characterized in that two pull wires are linked to a rotating member, and a plunger is pushed in by pulling one of the wires.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the illustrated embodiment, a directional control valve DV having a spool 2 is incorporated in a valve block 1. The directional control valve DV has both ends of the spool 2 facing the pilot chambers 3 and 3, and centering springs 4 and 4 are interposed in the pilot chambers 3 and 3. The spool 2 is switched by guiding the pilot pressure to one of the pilot chambers 3. When the spool 2 is switched,
Actuator ports 5 formed in valve block 1
One of the ports 5 is connected to a pump (not shown), and the other port is connected to a tank.

The valve block 1 also incorporates the spools 6, 6 of the manually operated valve HV of the present invention. However, the manually operated valve HV is provided on the side opposite to the actuator ports 5 and 5 with respect to the axis of the spool 2.

The spool 2 of the manually operated valve HV as described above is slidably incorporated in a sleeve 7 incorporated in the valve block 1, as shown in FIG. And
The lower end of the spool 6 faces a pressure chamber 8 on which a secondary pressure acts, and a spring 9 is provided in the pressure chamber 8. However, this spring 9 is attached to the spool 6
Is maintained at the normal position, which is the initial position shown, and is not for controlling the secondary pressure.

When the spool 6 is in the normal position, the primary port 10 is connected to the first land 1 of the spool.
1, and the secondary port 12 communicates with the tank port 15 via a notch 14 formed in the second land 13 of the spool 6. The pressure chamber 8
Is always in communication with the secondary port 12 via a communication passage 16 formed in the spool 6. The secondary port 1
2 and 12 are connected via a flow path 29 and 29 to a directional control valve DV.
At all times.

The plungers 17, 17 are in contact with the upper ends of the spools 6, 6, as described above. The plungers 17, 17 are slidably inserted into a pair of guide cylinders 19 provided on a casing 18, as is clear from FIG.

The casing 18 is fixed on the valve block 1, and the guide cylinders 19, 19 formed thereon are provided on extensions of the axes of the spools 6, 6. The plungers 17, 17 slidably provided on the guide cylinders 19, 19 are formed with flanges 20, 20 at portions protruding upward from the guide cylinders 19, 19,
A spring 2 is provided between the flanges 20 and 20 and the bottom of the casing 18 outside the guide cylinders 19 and 19.
1, 21 are interposed.

A supporting piece 22 is erected between the guide cylinders 19, and a turning member 23 is rotatably fixed to the supporting piece 22. In addition, a pair of wire connection holes 24, 24 are formed in the rotating member 23, and the pull wire 2 is formed in the wire connection holes 24, 24.
5, 25 are connected. And this pull wire 2
Reference numerals 5 and 25 are connected to an operation lever (not shown). Therefore, by operating the operation lever (not shown), one of the pull wires 25 is pulled, and the turning member 23 is turned in a predetermined direction.

Further, as is apparent from the drawing, the rotating member 23 has slopes 23a, 23a formed on both sides thereof, and a central portion between the slopes is provided with:
The retainer 27 is stopped via the adjuster bolt 26. A plate spring 28 is interposed between the retainer 27 and the rotating member 23.

The plate spring 28 as described above is
By tightening the adjuster bolt 26,
Both ends are bent in a direction approaching the slopes 23a, 23a. The fact that the amount of deflection of the plate spring 28 can be adjusted by the adjuster bolt 26 in this way means that the initial load of the plate spring 28 can be set freely. By tightening the adjuster bolt 26,
When the plate spring 28 is bent, for example, the rotating member 2
There is an advantage that the backlash in assembling the 3 and the retainer 27 can be absorbed.

The plungers 17, 17 pushed up by the springs 21, 21 are always in contact with the plate-like spring 28 as described above. The spring forces of the springs 21 and 21 are so weak that they hardly affect the control of the secondary pressure of the manually operated valve HV.

Next, the operation of the above embodiment will be described. now,
For example, by pulling the pull wire 25,
When the plunger 17 is tilted in the counterclockwise direction, which is the left direction in the drawing, the left plunger 17 is pushed down by the plate-like spring 28 and the spool 6 in contact with the plunger 17 also resists the spring 9. And descend. When the spool 6 is lowered, the first land portion 11 and the primary port 10 are opened, so that the primary port 10 and the secondary port 12 communicate with each other. Also, at this time,
The notch 14 formed in the second land portion 13 closes. Therefore, the pressure oil guided to the primary port 10 is guided to the secondary port 12 while being reduced in pressure according to the opening degree of the primary port 10.

At this time, the pressure on the secondary port 12 side is:
It is also guided to the pressure chamber 8 through the communication passage 16. Therefore, the spool 6 maintains a position where the acting force of the pressure chamber 8 and the spring force of the plate spring 28 are balanced. The opening degree of the primary port 10 at this balance position determines the pressure of the secondary port 12, that is, the direction switching valve DV.
Is controlled. Therefore, the pilot pressure output to the secondary port 12 is determined by the amount of tilt, which is the amount of operation of the rotating member 23.

Further, even if the amount of inclination of the rotating member 23 is the same,
The secondary pressure generated in the secondary port 12 varies depending on the amount of deflection of the plate spring 28. For example, if the amount of deflection of the plate spring 28 is reduced and its spring force is reduced, the secondary pressure generated in the secondary port 12 can be set low. This is because if the spring force of the plate-like spring 28 is weak, the spool 6 rises when the pressure on the secondary side increases even a little, and the opening degree of the primary side port 10 is reduced. This is because the degree of opening of the notch 14 that communicates with the tank port 15 increases. Conversely, if the spring force of the plate spring 28 is increased, even if the pressure generated in the secondary side port 12 is slightly increased, the plate spring 28 will step on and prevent the spool 6 from rising. . Therefore, the secondary pressure generated in the secondary port 12 can be kept high.

The spring force of the plate spring 28 is controlled by the adjuster bolt 26 and the retainer 27.
It is. Therefore, in this embodiment, the secondary pressure with respect to the operation angle of the rotating member 23 can be freely set by adjusting the tightening force of the adjuster bolt 26.

[0020]

According to the present invention, the rotating member and the operating lever can be linked via the pull wire, so that the manual operating valve is installed in a space with a sufficient space, and only the operating lever is placed in the driver's seat. It can be provided near.
Therefore, the degree of freedom in designing a construction vehicle or the like is significantly improved. In addition, since the manually operated valve can be installed at a place where there is enough space irrespective of the operation position, no excessive force is applied to the piping and the like.

[Brief description of the drawings]

FIG. 1 is a sectional view.

FIG. 2 is an enlarged sectional view of a spool portion.

[Explanation of symbols]

 HV Manually operated valve 6 Spool 17 Plunger 23 Rotating member 25 Pull wire

Claims (1)

[Claims] 1. A plunger and a spool are arranged in series on the same axis, and the rotating member is tilted to push the plunger and to switch the spool according to the amount of movement of the plunger, that is, the amount of tilt of the rotating member. A manually-operated valve in which two pull wires are linked to a rotating member and one of the wires is pulled to push a plunger.