JP2600316Y2 - Solenoid 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 an electromagnetic directional control valve, and more particularly to a technique effective when applied to a manual operation mechanism of an electromagnetic directional control valve.

[0002]

2. Description of the Related Art As a manual operating mechanism of a double solenoid type electromagnetic directional control valve, if two levers for displacing two valve bodies for pilot valves are provided for each of them, two of them are locked due to erroneous operation. There is a possibility that the adjustment may be performed as it is. This causes a malfunction of the electromagnetic directional switching valve, and it is necessary to prevent such a malfunction.

Conventionally, as a technique for achieving this, a single manual pin having two cams having different cam functions is attached to a side of the main body in the longitudinal direction of the main body in the vicinity of a pilot valve element and a plunger. It is known that a valve element for a pilot valve interlocked with a plunger is alternately displaced via a spacer by a cam action provided by rotation of a manual pin to open and close a valve hole. (Japanese Utility Model Laid-Open No. 1-168079, Japanese Utility Model Laid-Open No. 2-160881)

[0004]

However, in this conventional solenoid-operated directional control valve, the main shaft and the plunger are arranged in a line in the longitudinal direction of the main body, and the manual pin is located near the side. The body becomes wider. A plurality of electromagnetic directional control valves may be used side by side. In such a usage form, an electromagnetic directional control valve as narrow as possible is desired.

Further, if the cam action of the manual pin can be made to work linearly on the plunger via the spacer, the balance of the manual operating mechanism is improved. However, in a structure in which the manual pin is provided near the side as in the prior art, , This is difficult.

Further, the plunger displaced by the cam action of the manual pin may collide with the column before reaching the top dead center of the cam due to the axial tolerance of the electromagnetic directional control valve. In this case, there is a disadvantage that the manual pin cannot be rotated any more.

Therefore, one object of the present invention is to maintain a function of alternately displacing a valve element for a pilot valve by a cam action by one manual pin, and to provide a narrower electromagnetic directional switching valve. It is to provide the technology which can be.

Still another object of the present invention is to provide a technique capable of causing the cam action of the manual pin to act linearly on the plunger, and to increase the axial integration tolerance of the electromagnetic directional control valve. It is to provide a technology that can be absorbed.

The above and other objects and novel features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

[0010]

SUMMARY OF THE INVENTION Among the inventions disclosed in the present application, typical ones will be outlined as follows.

The electromagnetic directional control valve according to the present invention has a first pressure chamber in which a first piston provided at one end of a main shaft is accommodated, and a second piston provided at the other end of the main shaft. A valve body having a second pressure chamber, first and second plungers provided at the valve body and each having a valve body for a pilot valve at a tip thereof, between the main shaft and the respective plungers. A manual pin chamber that is provided and communicates with an input port; and is formed to communicate with the manual pin chamber, and communication between the first pressure chamber and the manual pin chamber is opened and closed by the first plunger. A first valve hole formed in communication with the manual pin chamber;
A second valve hole that allows communication between the pressure chamber and the manual pin chamber to be opened and closed by the second plunger; and a manual pin that is rotatably provided in the manual pin chamber and has one end exposed from the valve body. When the manual pin is rotated in one direction,
A first cam provided by notching the manual pin so as to move the first plunger in a direction to open the first valve hole via a first spacer, and a manual pin provided in a reverse direction. When rotated, the second spacer is moved through the second spacer.
And a second cam provided in the same direction as the first cam by notching the manual pin so as to move the second plunger in a direction in which the valve hole is opened. In the present invention, the spacer is formed of an elastic body.

[0012]

[0013]

[0014]

[0015]

According to the electromagnetic directional control valve having the above-described structure, the fluid is guided to the first and second pressure chambers via the manual pin chamber provided with the manual pin rotatably. The manual pin can be provided at the center in the width direction between each plunger and the main shaft, and the width of the valve body can be reduced as compared with the case where the manual pin is provided near the side surface.

[0016]

Further, when the spacer is made of an elastic body, the elastic body absorbs the axial tolerance, so that the pilot pin is smoothly displaced by the manual pin.

[0018]

FIG. 1 is a sectional view of an electromagnetic directional control valve showing one embodiment of the present invention, FIG. 2 is a sectional view showing the directional switching action of the electromagnetic directional control valve, FIGS. FIG. 5 is an explanatory view showing an operation state of a manual pin of the electromagnetic directional switching valve, and FIG. 6 is a perspective view of the manual pin.

First, the configuration of the electromagnetic directional control valve in this embodiment will be described.

The solenoid-operated directional control valve of the present embodiment has a main shaft 1
And the solenoid unit 2. First, the main shaft unit 1 will be described, and then the solenoid unit 2 will be described.

A main shaft 3 is accommodated in the main shaft portion 1 so as to be movable in the axial direction, and lip seals 4 are attached to, for example, four places around the main shaft. At both ends of the main shaft 3, a first piston 5 and a second piston 6 are provided. The pistons 5, 6 slide in the direction of the main shaft 3 by pressurizing the pressure chambers 7, 8, and move the main shaft 3 rightward or rightward. It is to be displaced to one of the left.

The main shaft 1 has an input port 9, a pair of output ports 10a and 10b, and a pair of exhaust ports 11.
a and 11b are opened, and each port becomes one in the spindle housing part. The displacement of the main shaft 3 causes the lip seal 4 provided around the main shaft 3 to partition between predetermined ports, whereby a fluid flow path from the input port 9 is formed.

Next, in the solenoid section 2, plungers 13a, 13b and columns 14a, 14b are provided in series inside the pair of solenoids 12a, 12b with a slight space therebetween. That is, when the solenoids 12a and 12b are excited, the plungers 13a and 13b
b, the springs 16a and 16b are provided on the flanges 15a and 15b so that a certain interval is obtained at the time of demagnetization.
a, 13b are pressed against the supply valve seats 17a, 17b.

Valves 18a and 18b for pilot valves are provided on the pressing portions of the plungers 13a and 13b against the supply valve seats 17a and 17b, and the solenoids 12a and 18b are provided.
At the time of demagnetization of 12b, valve holes 19a and 19b opened in supply valve seats 17a and 17b are closed.

Pins 20a and 20b are provided adjacent to the supply valve seats 17a and 17b, and are normally pushed from the flanges 15a and 15b of the plungers 13a and 13b to spread the flappers 21a and 21b. The fluid in the pressure chambers 7, 8 is discharged from the valve holes 21c, 21d to the outside through the pressure release holes 22.

Here, a manual pin chamber 29 is provided at the center in the width direction between the main shaft portion 1 and the solenoid portion 2 so as to be aligned with the main shaft portion 1 and the main body in the longitudinal direction. The manual pin 23 is rotatably housed with one end facing the outside. The manual pin 23 is provided at a right angle to the pair of plungers 13a and 13b, and a first cam 24a having a cam profile having a flat portion with a cutout outer peripheral surface near the plungers 13a and 13b of the manual pin.
And the second cam 24b are formed in the same direction.

The protrusion 25 of the manual pin 23 is provided with a groove 25c for rotating the manual pin 23 with a tool (not shown). On the opposite side, the manual pin 23 is moved to a predetermined position by a spring action. A spring 26 for installation is provided.

The cams 24a, 24b of the manual pin 23 pass through holes formed at the ends of the supply valve seats 17a, 17b.
And flanges 15a, 15b of plungers 13a, 13b
, Substantially L-shaped spacers 27a and 27b made of, for example, an elastic body are provided in opposite directions. By rotating the manual pin 23, the spacers 27a and 27b act on the plungers 13a and 1b against the pressing force of the springs 16a and 16b by the action of the cams 24a and 24b.
3b is displaced to open the valve holes 19a, 19b.

Next, the operation of the electromagnetic directional switching valve in this embodiment will be described separately for the first and second directional switching operations.

First, the first direction switching action is shown in FIGS. 2 and 4, and FIG. 2 is a sectional view showing an operation state thereof. FIG. 4 is a sectional view of the manual pin 23 at that time. It is explanatory drawing which shows an operation state.

That is, when the manual pin 23 is rotated clockwise, only the first cam 24a acts on the spacer 27a, thereby locking the first plunger 13a. As a result, the first plunger 13a is provided on the first plunger 27a. The first valve hole 1 closed by the valve body 18a for the pilot valve
9a is released. At the same time, the first plunger 1
The pin 20a pushed by the flange 15a of 3a is pushed back to the flapper 21a, thereby closing the valve hole 21c.

In this state, when fluid flows from the input port 9, the fluid pressurizes the pressure chamber 7 from the passage 28a through the manual pin chamber 29 and the first valve hole 19a. As a result, the first piston 5 slides to displace the main shaft 3, and the lip seal 4 provided on the main shaft 3 moves between the input port 9 and the output port 10b, and between the output port 10a and the exhaust port 11a. Seal between

Therefore, the fluid flowing from the input port 9 is guided from the output port 10a to a driven system (not shown) to drive the driven system, returns to the output port 10b, and is discharged from the exhaust port 11b.

The second direction switching operation is a state in which the second valve hole 19b is opened, contrary to the first direction switching operation, and FIG. 5 shows the operation state of the manual pin 23 at that time. FIG.

That is, when the manual pin 23 is rotated counterclockwise, only the second cam 24b acts on the spacer 27b to lock the second plunger 13b.
Thus, the second valve hole 19b closed by the pilot valve element 18b is opened, and at the same time, the pin 20b is pushed back to the flapper 21b, thereby closing the valve hole 21d.

Here, when the fluid flows in from the input port 9, the fluid flows from the passage 28a to the manual pin chamber 29 and to the second pin chamber 29.
The pressure chamber 8 is pressurized through the valve hole 19b and the passage 28b.

As a result, the second piston 6 slides to displace the main shaft 3, and the lip seal 4 seals between the input port 9 and the output port 10a and between the output port 10b and the exhaust port 11b. .

Therefore, the fluid flowing from the input port 9 drives a driven system (not shown) from the output port 10b, returns to the output port 10a, and is discharged from the exhaust port 11a.

As described above, in the solenoid-operated directional control valve according to the present embodiment, the plunger 13a is rotated by rotating the manual pin 23 so that the cam action of the first cam 24a and the cam action of the second cam 24b. , 13b are alternately displaced to open and close the first valve hole 19a and the second valve hole 19b.

Here, as described above, a manual pin chamber 29 is provided so as to be aligned in the longitudinal direction of the main shaft portion 1, the solenoid portion 2 and the main body to form a fluid flow path. Since the pins 23 are housed, the width of the main body can be reduced as compared with the case where the manual pins 23 are provided near the side surface of the main body.

Further, a manual pin chamber 29 is provided at a central portion in the width direction between the main shaft portion 1 and the solenoid portion 2, and the manual pin 23 is accommodated in the manual pin chamber 29, so that the manual pin 23 is located near the plungers 13a and 13b. The cam action of the formed cams 24a, 24b can linearly act on the plungers 13a, 13b via the spacers 27a, 27b to displace them.

The cams 24a, 2a in this embodiment are
According to the cam profile 4b, the plungers 13a and 13b are in the locked state when the spacers 27a and 27b are in contact with the outer peripheral surfaces of the cams 24a and 24b. Because it is a wide range of minutes,
Plungers 13a, 13b without being affected by vibration and the like
Can be stably maintained.

Further, when the spacers 27a and 27b are made of an elastic material, the spacers 27a and 27b can absorb the accumulation tolerance in the axial direction.

[0044]

[0045]

[0046]

[0047]

[0048]

[0049]

[0050]

[0051]

[0052]

[0053]

[0054]

[0055]

Although the invention made by the present inventors has been specifically described based on the embodiments, the invention is not limited to the above embodiments, and various modifications can be made without departing from the gist of the invention. Needless to say.

For example, the solenoid-operated directional control valve of this embodiment is a five-port type having an input port, a pair of output ports, and a pair of exhaust ports, each of which has one port.
It may be a three-port type, one for each.

In this embodiment, the spacers are described as having a substantially L-shape or a substantially U-shape. However, a spacer having an arbitrary shape such as a cube can be used. Does not necessarily need to be made of an elastic body.

[0059]

[Effects of the Invention] Of the ideas disclosed in the present application, the effects obtained by typical ones will be briefly described.
It is as follows.

(1) According to the solenoid-operated directional control valve of the present invention, the main shaft portion, the solenoid portion, and the manual pin chamber are arranged in the longitudinal direction of the main body by using the manual pin chamber as a fluid flow path. Can be set in a line, so that the width of the main body can be reduced, and the space efficiency when a plurality of electromagnetic directional control valves are used side by side is improved.

(2) At the same time, since the cam action of the cam formed on the manual pin by this acts linearly on the plunger via the spacer, the balance of the manual operation mechanism is improved and the reliability is improved. improves.

(3) By making the spacer an elastic body, it is possible to absorb the accumulation tolerance of the manual pin in the axial direction, so that the plunger displaced by the cam action of the manual pin causes the top dead center of the cam. The inconvenience of colliding with the column before reaching the point is eliminated.

(4) When one of the plungers is in the locked position, the other plunger is always in the unlocked position, so that there is no danger of adjusting both plungers with the unlocked position together. Therefore, when one valve hole is opened, the other valve hole is always closed, and the malfunction of the non-driving system due to erroneous adjustment is eliminated.

(5) Further, since the manual pin can be provided at the center of the main body in the width direction, the operation means of the manual pin can be set at the center of the apparatus, and the operability is improved.

(6) In particular, the plunger is in the locked state when the spacer is in contact with the outer peripheral surface of the cam.
Since the range is about a half rotation of the manual pin, the plunger can be stably maintained in the locked state without being affected by vibration or the like.

[Brief description of the drawings]

FIG. 1 is a sectional view of an electromagnetic directional control valve showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a direction switching action of the electromagnetic direction switching valve of FIG.

FIG. 3 is an explanatory view showing a neutral state of a manual pin of the electromagnetic directional switching valve of FIG. 1;

FIG. 4 is an explanatory view showing a state in which a first plunger of a manual pin of the electromagnetic directional switching valve in FIG. 1 is in a locked position.

FIG. 5 is an explanatory view showing a state in which a second plunger of a manual pin of the electromagnetic directional switching valve in FIG. 1 is in a locked position.

FIG. 6 is a perspective view of a manual pin of the electromagnetic directional switching valve of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main shaft part 2 Solenoid part 3 Main shaft 4 Lip seal 5 First piston 6 Second piston 7,8 Pressure chamber 9 Input port 10a, 10b Output port 11a, 11b Exhaust port 12a, 12b Solenoid 13a First plunger 13b First 2 plungers 14a, 14b Columns 15a, 15b Flanges 16a, 16b Springs 17a, 17b Supply valve seats 18a, 18b Valve body for pilot valve 19a First valve hole 19b Second valve hole 20a, 20b Pin 21a, 21b Flapper 21c, 21d Valve hole 22 Pressure release hole 23 Manual pin 24a First cam 24b Second cam 25 Projection 25c Groove 26 Spring 27a, 27b Spacer 28a, 28b Passage 29 Manual pin chamber

Claims (2)

(57) [Scope of request for utility model registration] 1. A first piston provided at one end of a main shaft.
A first pressure chamber in which is accommodated, provided at the other end of the main shaft.
Valve having a second pressure chamber in which a closed second piston is accommodated
A main body, a valve body for a pilot valve provided at the tip, provided at the valve main body.
First and second plungers respectively provided between the main shaft and the respective plungers;
A manual pin chamber communicating with the input port; and a manual pin chamber formed in communication with the manual pin chamber .
The communication between the pressure chamber and the manual pin chamber is performed by the first plug.
A first valve hole that is opened and closed by a switcher and the manual pin chamber.
The communication between the pressure chamber of the second and the manual pin chamber is performed by the second plug.
A second valve hole that is opened and closed by a jaw jar, and rotatably provided in the manual pin chamber.
When the manual pin exposed from the valve body is rotated in one direction, the first spacer
The first plan in a direction to open the first valve hole through
Cut out the manual pin so as to move the jaw
When the first cam and the manual pin are rotated in opposite directions, the second spacer
The second plan in a direction to open the second valve hole through
Cut out the manual pin to move the jaw
Having a second cam provided in the same direction as the first cam
Electromagnetic directional control valve, characterized in that that. 2. The electromagnetic directional control valve according to claim 1, wherein said spacer is made of an elastic material.