JP2578553Y2 - Liquid directional valve - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid directional control valve which is provided on a manifold in such a manner that it can be disposed in a stacked manner together with various laminated liquid control valves to constitute a valve device for controlling the operation of a hydraulic actuator.

[0002]

2. Description of the Related Art Conventionally, there is a liquid directional switching valve of this type as shown in FIG. This liquid directional valve 37 is
A first load channel 40A and a second load channel 40 connected to the supply channel 38 for supplying the pressure liquid and the hydraulic actuator 39.
B and a low-pressure flow path 41 connected to the low-pressure side, and in the illustrated neutral state in which the first pilot valve 42A and the second pilot valve 42B are disconnected from each other when the first pilot valve 42A and the second pilot valve 42B are not energized. It is at the position X1, and is switched to the first switching position Y1, which communicates between the supply flow path 38 and the first load flow path 40A and between the second load flow path 40B and the low-pressure flow path 41 by an energizing operation to the second pilot valve 42B. Alternatively, from the state at the neutral position X1, the second pilot flow path between the supply flow path 38 and the second load flow path 40B and the flow path between the first load flow path 40A and the low-pressure flow path 41 by the operation of energizing the first pilot valve 42A. It is provided to switch to the switching position Z1.

[0003]

However, in order to obtain a meter-out circuit for controlling the speed by restricting the liquid derived from the hydraulic actuator 39 at the first switching position Y1 and the second switching position Z1 of the liquid directional switching valve 37. Are non-return valves 43A and 43B for making the liquid flow from the two load flow paths 40A and 40B sides of the liquid direction switching valve 37 to the hydraulic actuator 39 side free and preventing the flow in the opposite direction, and the check valves 43A and 43B. 4
A stacked meter-out liquid throttle valve 45, which is one of the stacked liquid control valves provided with the throttle valves 44A and 44B arranged side by side with 3A and 43B, must be stacked on the manifold 46. There is a problem that the number of stacked liquid control valves constituting the valve device 47 increases and the entire device becomes large. The present invention solves such a problem.
It is an object of the present invention to provide a liquid directional control valve having a built-in function for obtaining a meter-out circuit of a hydraulic actuator and capable of reducing the size of a valve device.

[0004]

Therefore, according to the present invention, a fitting hole for slidably fitting a switching valve body in an axial direction is provided inside a valve body, and a supply flow path for supplying a pressurized liquid is provided. a first load passage that connects a hydraulic actuator, first low-pressure line connected to the second load passage and the low pressure side, a second and a low-pressure line, the supply and the supply passage in the fitting hole The first load flow path and the first low-pressure flow path are connected to one side of the flow path, and the second load flow path and the second low-pressure flow path are sequentially connected to the other side of the supply flow path at an axial interval. One end of each channel provided in communication with the fitting hole
An opening is provided at the joint surface of the valve body joined to the hold, and the supply passage and the first load passage and the second load passage and the second low-pressure passage are communicated by sliding the switching valve body in the axial direction. It has at least two positions, a first switching position and a second switching position communicating between the supply flow path and the second load flow path and between the first load flow path and the first low pressure flow path. A throttle member is provided on at least one of the second low-pressure passages so that a meter-out circuit of the hydraulic actuator can be obtained at the first switching position or the second switching position, and the stacked arrangement of the liquid directional switching valve is released.
The throttle member is at least one of the low-pressure channels
It is provided detachably from the opening side to the joining surface .

[0005]

In the configuration of the present invention, at the first switching position, the pressure liquid in the supply flow path flows through the first load flow path and is introduced into the hydraulic actuator, and the liquid derived from the hydraulic actuator is supplied to the second load flow path. Then, the fluid flows through the second low-pressure flow path and is discharged to the low-pressure side, and the hydraulic actuator operates in one direction. Also,
At the second switching position, the pressurized liquid in the supply flow path flows through the second load flow path and is introduced into the hydraulic actuator, and the liquid derived from the hydraulic actuator flows through the first load flow path and the first low-pressure flow path so as to have a low pressure. And the hydraulic actuator operates in the other direction. In at least one of the first switching position and the second switching position, the liquid flowing through the first low-pressure flow path or the second low-pressure flow path is throttled by the throttle member, and the speed of the hydraulic actuator is controlled by the meter-out circuit. For this reason, unlike a valve device using a conventional liquid directional valve, it is not necessary to specially arrange a laminated meter-out liquid throttle valve on a manifold in order to obtain a meter-out circuit of a hydraulic actuator. The number of stacked liquid control valves constituting the device can be reduced, and the entire device can be downsized.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. 1 and 2 show a liquid directional control valve 1 according to one embodiment.
Denotes a valve device 3 directly laminated on the manifold 2, and 4 denotes a valve body of the liquid directional control valve 1, in which a fitting hole 5 is provided by being bored in the axial direction, and a fitting hole 5 is provided. 5, large-diameter holes 6A, 6B are provided continuously at both ends of large-diameter holes 6A, 6B.
Are provided at both end surfaces of the valve body 4 so as to open. 9
Is a supply flow path for supplying the pressure liquid, and is provided so as to communicate with a central portion of the fitting hole 5, and has one end opened to the joint surface 1 </ b> A which joins the manifold 2. 10A is a flow path 12A provided in the manifold 2 on the head side of the hydraulic actuator 11.
A first load flow path connected to the fitting hole 5 at one side of a communication point of the supply flow path 9 with a gap in the axial direction, and one end opened to the joint surface 1A. ing. 13A is a first low-pressure flow path connected to a tank 14 as a low-pressure side via a flow path 15A provided in the manifold 2, and is axially connected to one side of a communication point of the first load flow path 10A with the fitting hole 5 in the axial direction. One end is opened to the joint surface 1A so as to communicate with an interval, and a threaded portion is formed on the opening side. 10B is a flow path 12B provided in the manifold 2 on the rod side of the hydraulic actuator 11.
A second load flow path connected through a connection hole is provided so as to communicate with the other side of the communication path of the supply flow path 9 to the fitting hole 5 with an interval in the axial direction, and one end is opened to the joint surface 1A. ing. Reference numeral 13B denotes a second low-pressure flow path connected to the tank 14 via a flow path 15B provided in the manifold 2, and a second load flow path 10
B is provided in communication with the other side with an interval in the axial direction, and one end is opened to the joint surface 1A, and a thread portion is formed on the opening side.

Reference numeral 7 denotes a switching valve body which is slidably fitted in the fitting hole 5 in the axial direction, and has four land portions 8 spaced apart in the axial direction.
have. Reference numerals 16A and 16B denote pilot chambers formed at both ends of the switching valve body 7 by closing the openings of the large-diameter holes 6A and 6B with the lid members 17A and 17B so that the pilot liquid is introduced or the liquid inside is drawn out. Provided. 1
Reference numerals 8A and 18B denote springs for holding the switching valve element 7 at the neutral position X, which are accommodated and provided in the pilot chambers 16A and 16B.
The first load flow path 10A, the second load flow path 10B, the first low-pressure flow path 13A, and the second low-pressure flow path 13B are provided so as to be interrupted. The liquid directional control valve 1 has two pilot chambers 16A and 16B.
Of the switching valve 7 by the springs 18A and 18A.
B and the neutral position X held by B and the pilot room 1
The switching valve element 7 slides in the axial direction by introducing the pilot liquid into the pilot chamber 6B and drawing out the liquid in the pilot chamber 16A.
It has three positions: a switching position Y, and a second switching position Z in which the switching valve element 7 slides in the axial direction by introducing the pilot liquid into the pilot chamber 16A and drawing out the liquid in the pilot chamber 16B. Then, at the first switching position Y, between the supply flow path 9 and the first load flow path 10A, and between the supply flow path 9 and the second load flow path 10B.
The second switching position Z is provided by communicating between the low-pressure channels 13B, and is provided by communicating between the supply channel 9 and the second load channel 10B and between the first load channel 10A and the first low-pressure channel 13A at the second switching position Z. I have.

Reference numeral 19A denotes a throttle member screwed to the thread portion of the first low-pressure channel 13A and disposed in the first low-pressure channel 13A. The throttle member 20A is formed by connecting a throttle hole 20A and a hexagonal hole for engaging a tool. The hydraulic actuator 1 is provided to penetrate in the axial direction,
2 is provided to obtain a meter-out circuit for controlling the operation of the hydraulic actuator 11 in the rightward direction in FIG. 19
B is a throttle member screwed to the thread of the second low-pressure channel 13B and disposed in the second low-pressure channel 13B. A hexagonal hole for engaging a tool with the throttle hole 20B having a smaller throttle opening than the throttle hole 20A. Are connected to each other in the axial direction, and at the first switching position Y, the liquid derived from the rod side of the hydraulic actuator 11 is squeezed to move in the left direction in FIG. A meter-out circuit is provided to control the speed of operation slower than rightward operation. Each of the throttle members 19A and 19B connects the liquid directional control valve 1 to the manifold 2
The tool is detachably provided by engaging the hexagonal hole from the opening side of the low-pressure channels 13A and 13B to the joint surface 1A. 21A and 21B are pilot flow paths communicating with the pilot chambers 16A and 16B and having one end opened to the joint surface 1A,
22 is each flow path 9, 10A, 10 opened in the joint surface 1A.
O-rings 23A and 23B disposed around the openings of B, 13A, 13B, 21A and 21B are manual operation members for manually operating the switching valve body 7, and are slidably fitted in the lid members 17A and 17B in the axial direction. It is also provided with a stopper function for regulating the positions of both ends of the switching valve element 7 that has slid in the axial direction.

On the mounting surface 2A of the manifold 2 which is joined to the joining surface 1A of the liquid directional control valve 1, a flow path 24 communicating with the supply flow path 9 of the liquid directional control valve 1 and a first load flow path 10A
12A, a flow path 12B communicating with the second load flow path 10B, and a flow path 1 communicating with the first low-pressure flow path 13A.
5A, a flow path 15B communicating with the second low-pressure flow path 13B,
Pilot flow path 25A communicating with pilot flow path 21A
And a pilot flow path 2 communicating with the pilot flow path 21B
5B is provided with an opening. The flow path 24 is provided so as to be connected to the hydraulic pressure source 26. 27A is manifold 2
A first pilot valve mounted on one side surface orthogonal to the mounting surface 2A of the liquid supply device. The first pilot valve is connected to a pilot supply passage 28A for supplying a pilot liquid by an energizing operation. The pilot liquid is introduced into the pilot chamber 16A, and the pilot flow path 25A is switched to a pilot low-pressure flow path 29A that connects the pilot flow path 25A to the tank 14 via the flow path 15A by a non-energized operation, so as to lead out the liquid in the pilot chamber 16A. . Reference numeral 27B denotes a second pilot valve mounted on the other side of the manifold 2 opposite to the one side on which the first pilot valve 27A is mounted. The pilot liquid is introduced into the pilot chamber 16B, and the liquid in the pilot chamber 16B is led out by switching the pilot flow path 25B to the pilot low pressure flow path 29B by a non-energizing operation.

Next, the operation of the above configuration will be described. 1 and 2 show the state where the pilot flow path 2 is in a state where both the first pilot valve 27A and the second pilot valve 27B are in the non-energized state.
5A and 25B are switched to the pilot low pressure passages 29A and 29B, and the switching valve body 7 is held at the neutral position X by springs 18A and 18B to supply the supply passage 9, the first load passage 10A and the second load passage 10A. A load passage 10B, a first low-pressure passage 13A,
The hydraulic actuator 1 shuts off between the second low pressure passages 13B.
1 is stopped at the right end shown in FIG.

In this state, when the second pilot valve 27B is energized, the pilot flow path 25B is switched to the pilot supply flow path 28B, and the pilot supply flow path 28B
The pilot liquid flows through the pilot flow paths 25B and 21B and is introduced into the pilot chamber 16B, and the switching valve body 7 acts against the force of the spring 18A by the action force based on the pressure of the pilot liquid introduced into the pilot chamber 16B in FIG. Sliding leftward in the axial direction, abuts the manual operation member 23A, and contacts the first switching position Y
Becomes At this time, the liquid in the pilot chamber 16A flows out to the pilot flow path 21A, flows through the pilot flow path 25A, the pilot low-pressure flow path 29A, and the flow path 15A, and is discharged to the tank 14. The pressure liquid supplied from the hydraulic pressure source 26 to the supply channel 9 through the channel 24 is supplied to the first load channel 10A and the channel 1
The liquid flowing through 2A is introduced into the head side of the hydraulic actuator 11, and the liquid derived from the rod side of the hydraulic actuator 11 flows through the flow path 12B and the second load flow path 10B and is disposed in the second low-pressure flow path 13B. It is squeezed by the squeezing hole 20B of the squeezing member 19B, flows through the flow path 15B and is discharged to the tank 14,
The hydraulic actuator 11 is speed-controlled by the meter-out circuit and operates leftward in FIG. Then, when the hydraulic actuator 11 operates to the left end, the second pilot valve 27B is de-energized, and the liquid in the pilot chamber 16B is led out to the pilot flow path 21B and the pilot flow path 25B.
B, flows through the pilot low-pressure flow path 29B and the flow path 15B and is discharged to the tank 14, and the switching valve body 7 returns to the neutral position X by the spring force of the spring 18A and slides.
1 stops at the left end.

When the first pilot valve 27A is energized while the hydraulic actuator 11 is stopped at the left end, the pilot flow path 25A is changed to the pilot supply flow path 28A.
The pilot liquid is introduced into the pilot chamber 16A by switching communication, and the switching valve element 7 is actuated based on the pressure of the pilot liquid introduced into the pilot chamber 16A and acts against the force of the spring 18B to the right in FIG. The liquid 16B slides out in the axial direction while coming out of contact with the manual operation member 23B to be in the second switching position Z. The pressure liquid in the supply flow path 9 flows through the second load flow path 10B and the flow path 12B and is introduced into the rod side of the hydraulic actuator 11, and the liquid derived from the head side of the hydraulic actuator 11 is supplied through the flow path 12A and the first Load channel 1
The throttle member 1 that flows through 0A and is disposed in the first low-pressure channel 13A.
The liquid pressure actuator 11 is throttled by the 9A throttle hole 20A, flows through the flow path 15A and is discharged to the tank 14, and the speed of the hydraulic actuator 11 is controlled by a meter-out circuit to operate rightward. When the hydraulic actuator 11 operates to the right end shown in FIG. 2, the first pilot valve 27A is de-energized,
The switching valve element 7 returns to the neutral position X due to the spring force of the spring 18B, and the hydraulic actuator 11 stops at the right end shown in FIG.

In this operation, at the first switching position Y of the liquid directional control valve 1, a meter-out circuit which operates to the left of the hydraulic actuator 11 is obtained by the throttle member 19B arranged in the second low pressure passage 13B. At the same time, in the second switching position Z, the throttle member 19A disposed in the first low-pressure flow path 13A
As a result, a meter-out circuit that operates to the right of the hydraulic actuator 11 is obtained. Therefore, as in a conventional valve device using a liquid directional control valve, a laminated type on a manifold is obtained to obtain a meter-out circuit of a hydraulic actuator. The meter-out liquid throttle valve does not need to be particularly stacked, and the number of stacked liquid control valves constituting the valve device can be reduced, and the entire device can be downsized. Also, throttle members 19A, 19B are provided in both low-pressure channels 13A, 13B connected to the tank 14.
The order to obtain a meter-out circuit of the hydraulic actuator 11 by disposing the aperture member 19A, 19B can Rukoto provided to those in handling easier small shapes lightweight. further,
By dissolving the laminated arrangement of the liquid directional valve 1, the throttle member
Since 19A and 19B are provided detachably from the opening side to the joint surface 1A of the disposed two low-pressure channels 13A and 13B ,
Throttling members 19A, 19B to both low pressure passages 13A, 13B
Can be easily attached and detached, and an optimal throttle member according to the specifications can be easily arranged, so that a good meter-out circuit of the hydraulic actuator 11 can be obtained.

FIG. 3 shows a modified example of the throttle member provided in both low-pressure channels. FIG. 3A shows a large-diameter portion formed on the opening side of the low-pressure channels 30 to the joining surface 1A. By fitting a cylindrical throttle member 31 to the portion, the axial movement is regulated by the end surfaces of different diameters, and the throttle members 31 are disposed in the two low-pressure flow paths 30. Through.
(B), the diameter of the concave groove 35 for accommodating the O-rings 34 provided around the openings of the two low-pressure channels 33 opened on the joint surface 1A is provided, and the throttle member 36 is cylindrical and has a flange at the end. The axial movement is restricted by engaging the flange of the throttle member 36 with the recessed groove 35 and the throttle member 36 is
Is arranged. (C) accommodates a disc-shaped throttle member 36A in a concave groove 35 for accommodating an O-ring 34, and arranges a throttle member 36A in both low-pressure channels 30. A thin blade orifice 36B is provided in the throttle member 36A. It is provided so as to penetrate in the axial direction, so as to reduce the influence of the viscosity caused by the temperature change of the liquid to suppress the fluctuation of the flow rate.

In this embodiment, a pilot type three-position liquid directional control valve is shown. However, a direct-acting type may be used, or a two-position type having a first switching position Y and a second switching position Z. But it is good. Further, although the throttle members 19A and 19B are provided in each of the first low-pressure channel 13A and the second low-pressure channel 13B, it goes without saying that the throttle members may be provided in only one of them.

[0016]

As described above, according to the present invention, there is provided a liquid directional control valve which constitutes a valve device which is provided on a manifold so as to be able to be laminated and which controls the operation of a hydraulic actuator.
A fitting hole for slidably fitting the switching valve body in the axial direction is provided inside the valve body, and a supply passage for supplying the pressurized liquid, a first load passage connected to the hydraulic actuator, and a second load passage. the first low-pressure line that connects to the load passage and the low pressure side, and a second low-pressure line, the fitting hole first on one side of the supply channel and the supply channel 1
The load flow path and the first low-pressure flow path are provided on the other side of the supply flow path in such a manner that the second load flow path and the second low-pressure flow path are respectively communicated with an interval in the axial direction, and communicate with the fitting hole. One end of each channel provided
Open the joint surface of the valve body that joins the manifold.
A first switching position for communicating between the supply flow path and the first load flow path and between the second load flow path and the second low-pressure flow path by sliding the switching valve body in the axial direction; A second switching position for communicating between the roads and between the first load flow path and the first low-pressure flow path, at least two positions, and a first switching position for at least one of the first low-pressure flow path and the second low-pressure flow path; Alternatively, a throttle member is provided so as to obtain a meter-out circuit of the hydraulic actuator at the second switching position, and the stacked arrangement of the liquid directional switching valve is released.
As a result, at least one low-pressure
The meter-out circuit is installed on the manifold in order to obtain the meter-out circuit of the hydraulic actuator, just like the conventional valve device using a liquid directional valve, by providing it detachably from the opening side to the joint surface of the flow path. The liquid throttle valve does not need to be particularly stacked, and the number of stacked liquid control valves constituting the valve device can be reduced, and the entire device can be downsized. In addition, since a throttle member is disposed on at least one of the first low-pressure channel and the second low-pressure channel connected to the low-pressure side to obtain a meter-out circuit of the hydraulic actuator, the throttle member has a small shape that is easy to handle. can Rukoto provided to those of lightweight
You. Further, by dissolving the stacked arrangement of the liquid directional control valve, the throttle member can be connected to at least one of the low-pressure channels.
Since it is provided detachably from the opening side to the mating surface, it is possible to easily attach and detach the throttle member to the low pressure flow path, and it is possible to easily arrange the optimal throttle member according to the specifications, and it is possible to arrange the hydraulic actuator This has the effect that a good meter-out circuit can be obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a valve device in which a liquid directional control valve according to an embodiment of the present invention is stacked on a manifold.

FIG. 2 is a hydraulic circuit diagram of FIG.

FIGS. 3A, 3B, and 3C are enlarged partial cross-sectional views showing modified examples of different aperture members.

FIG. 4 is a hydraulic circuit diagram of a conventional example.

[Explanation of symbols]

 1 Liquid directional switching valve 2 Manifold 3 Valve device 4 Valve body 5 Fitting hole 7 Switching valve body 9 Supply flow path 10A First load flow path 10B Second load flow path 11 Hydraulic actuator 13A, 30, 33 First low pressure flow Road 13B, 30 33 Second low-pressure flow path 19A, 19B, 31, 36, 36A throttle member Y first switching position Z second switching position

Claims (1)

(57) [Scope of request for utility model registration] 1. A liquid directional control valve which constitutes a valve device for controlling the operation of a hydraulic actuator which is provided on a manifold so as to be able to be stacked and arranged, wherein a directional control valve body is slid in an axial direction inside a valve body. A fitting hole for freely fitting is provided, and a first load passage connected to the supply passage for supplying the pressure liquid and the hydraulic actuator, and a first load passage connected to the second load passage on the low pressure side.
Low-pressure line, a second and a low-pressure line, the supply passage in the fitting hole
Communicating at a distance to the first load passage and each successively axially a second load passage and the second low-pressure line to the other side of the supply channel of the first low-pressure line on one side of the supply channel and And communicate with the fitting hole
Body that joins one end of each flow channel provided with the manifold
And a first switching position for providing communication between the supply flow path and the first load flow path and between the second load flow path and the second low-pressure flow path by axial sliding of the switching valve body. A second switching position for communicating between the flow path and the second load flow path and between the first load flow path and the first low pressure flow path, and at least two positions of the first low pressure flow path and the second low pressure flow path; the diaphragm member so that the meter-out circuit of the hydraulic actuator in the first switch position or the second switching position is obtained arranged to at least one liquid directional control
By removing the stacking of the valve, the throttle
At least one low-pressure flow path can be attached or detached from the opening side to the joint surface
Liquid directional switching valve freely provided .