JP3312845B2 - Control 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 control valve such as a hydraulic switching valve, and more particularly to a structure for a flow passage of a mating member to which the control valve is mounted.

[0002]

2. Description of the Related Art As a conventional control valve of this type, there is, for example, a hydraulic switching valve which requires switching of a large flow rate as shown in FIG. That is, this hydraulic switching valve is a three-way valve in which the spool 100 slides to switch the pressure, and the spool 100 is slidably inserted into the inner periphery of the guide hole 102 of the valve body 101.

[0003] The valve body 101 is provided with a control port 103 on the output side to an actuator which is opened at an inner periphery of a guide hole 102 provided at a predetermined interval in the axial direction, and a supply of pressure oil from a pressure source. Side pressure supply port 104;
Three ports are provided, one on the one end of the guide hole 102 and the drain port 105 on the discharge side.

[0004] The valve body 101 is provided with a mating mounting member 10.
6, a control port 103 and a pressure supply port 104 are provided on the inner periphery of the mounting hole 107 at predetermined intervals in the axial direction. It is assembled so as to match with the pressure supply flow path 109 on the supply side to which the pressure oil is supplied. At this time, the drain flow channel 110 opened at one end of the mounting hole 107 and the drain port 105 match.

Then, the spool 100 is connected to the solenoid 11
1, the control port 103
And the pressure supply port 104 and the control port 103 and the drain port 105 are selectively connected.

That is, when the solenoid 111 is turned on, the spool 100 is pushed toward the drain port 105 side via the rod 113 and moves against the spring force of the spring 112 provided on the drain port 105 of the spool 100. The communication between the pressure supply port 104 and the control port 103 (see the left half in FIG. 3).

As a result, the fluid from the pressure supply channel 109 is supplied to the control channel 108 via the pressure supply port 104 and the control port 103.

On the other hand, when the solenoid 111 is turned off, the spool 100 moves toward the solenoid 111 by the spring force of the spring 112 provided on the drain port 105 side of the spool 100, and the control port 103 and the drain port 105 communicate with each other. (See the right half in FIG. 3).

As a result, the water is discharged from the control channel 108 to the drain channel 110 via the control port 103 and the drain port 105.

As described above, the so-called push type solenoid 111 switches the hydraulic pressure through one control port 103.

[0011]

By the way, the positions of the control flow path 108 and the pressure supply flow path 109 are interchanged due to the piping of the mating side mounting member 106 and the like, so that the valve body 101 is changed.
It is necessary to exchange the positions of the control port 103 on the control flow path 108 side and the pressure supply port 104 on the pressure supply flow path 109 side.

When the port positions are exchanged, a so-called pull type solenoid can be used. That is, as shown in FIG. 4A, when the solenoid is OFF, the control port 103 communicates with the drain port 105 via the spool 100, and when the solenoid is ON, FIG.
By moving the spool 100 to the solenoid side (corresponding to the ON position of the left half solenoid 111 in FIG. 3) as shown in FIG.
3 can be communicated.

As described above, in the pull type solenoid, the hydraulic pressure can be switched through one control port 103.

However, in the above-described conventional hydraulic pressure switching by the push type solenoid 111,
It was difficult to construct a control valve.

That is, the control valve uses a push type solenoid as shown in FIG.
No. 5).

The control valve 200 is mounted on the mating mounting member 10.
The control flow path and the pressure supply flow path of 6A are replaced with the positions shown in FIG. 3 as the control flow path 108A and the pressure supply flow path 109A, and the drain flow path is formed in the inner periphery of the mounting hole 107A from the pressure supply flow path 109A in the axial direction. Drain flow path 1 that opens apart
10A, and a valve body 101A corresponding to each flow path.
The control port 103A provided at a predetermined interval in the axial direction on the inner circumference of the guide hole 102 has a control channel 108A, the pressure supply port 104A has a pressure supply channel 109A, and the drain port 105A has a drain channel 110A. It is assembled to match.

As described above, since the drain passage 110A of the mating attachment member 106A is provided at a position that opens to the inner periphery of the attachment hole 107A, one end of the attachment hole 107A is closed. Thereby, the drain port 105A
Since the valve body 101A also becomes a position that opens to the inner periphery of the guide hole 102 of the valve body 101A, the valve body 101A also has a structure in which the plate 114 closes the opening end of the guide hole 102.

On the other hand, a spool 100A reciprocated by a solenoid (not shown) has a substantially U-shaped cross section, and the control port 103A has a small-diameter portion 100B having a small outer diameter. Has a through-hole 100C formed through in the radial direction. Furthermore, the small diameter portion 100B
And the inner peripheral surface of the valve body 101A form a passage 201.

When the solenoid is ON, the spool 100A
And a spring 112 provided between the plate 114
The spool 100A is pushed via the rod 113 and moves toward the plate 114 against the spring force of the above, and the pressure supply port 104A and the control port 103A communicate with each other.

As a result, the fluid from the pressure supply channel 109A is supplied to the control channel 108A via the pressure supply port 104A, the passage 201, and the control port 103A (see the solid line arrow in FIG. 5).

On the other hand, when the solenoid is turned off, the spool 100A moves to the solenoid side by the spring force of the spring 112, and the control port 103A and the drain port 1 are moved.
05A communicate with each other (see FIG. 5).

As a result, the water is discharged from the control flow path 108A to the drain flow path 110A via the control port 103A, the passage 201, the through hole 100C, the inside of the spool 100A, and the drain port 105A (see the two-dot chain line arrow in FIG. 5). .

As described above, although the hydraulic pressure can be switched through one control port 103A by the push-type solenoid 111, the control valve 20 can be switched.
Reference numeral 0 denotes a structure in which the mating side mounting member 106A opens the position of the drain flow path 110A to the inner periphery of the mounting hole 107A, that is, the mating side mounting member 106 closing one end like the mounting hole 107A.
A is limited.

This is the same as the control valve 200 shown in FIG.
When the drain flow channel 110 shown in FIG. 2 is mounted on the mating mounting member 106 having an opening at one end of the mounting hole 107, a hole is opened in the plate 114 closing the guide hole 102 which is the valve tip. Solenoid ON
This is because, at the time of control, the fluid to be supplied to the control flow path 108A flows to the outside from the hole, and the valve cannot be established.

The present invention has been made to solve the above-mentioned problems of the prior art.
It is to provide a control valve capable of improving quality.

[0026]

In order to achieve the above object, according to the present invention, there is provided a valve body having a guide hole therein, and the valve body is axially separated from the valve body and opened to the inner periphery of the guide hole. A pressure supply port and a control port; a drain port opened at one end of a guide hole of the valve body; and a spool slidably inserted into an inner periphery of the guide hole of the valve body. In the mounting hole of the mounting member, the pressure supply port is provided in a pressure supply flow path opening in the inner circumference of the mounting hole, the control port is provided in a control flow path opening in the inner circumference of the mounting hole, and the drain port is connected to one end of the mounting hole. The control port and the pressure supply port, and the control port and the drain port are selectively connected by the reciprocating movement of the spool. The pressure is switched by communicating, and when the control port and the pressure supply port are in a communicating state, the fluid from the pressure supply flow path is supplied to the control flow path, while the control port and the pressure supply port are connected to each other. Is a control valve configured to discharge fluid from the control flow path to the drain flow path in a communication state, wherein the control port communicates with the pressure supply port by reciprocating the spool. A first control port for supplying a fluid from a passage to the control flow path, and a second control port for discharging a fluid from the control flow path communicating with the drain port to the drain flow path. It is characterized by.

In the control valve having the above-described structure, the control port is provided with a first control port for supplying a fluid from the pressure supply passage communicating with the pressure supply port to the control passage by reciprocating the spool. Is divided into a second control port for discharging the fluid from the control flow path communicating with the drain port to the drain flow path, so that the first control port and the pressure supply port and the second control port and the drain port are selected. Can communicate with each other. Therefore, the supply and discharge of the fluid can be selectively performed, and the pressure can be switched.

As described above, the first control port is a port that only supplies the fluid from the pressure supply flow path that opens to the inner periphery of the mounting hole of the mating mounting member to the control flow path that similarly opens to the inner circumference of the mounting hole. Since the two control ports are separate from the ports that only discharge the fluid from the control flow path to the drain flow path opening at one end of the mounting hole, the fluid is supplied to the control flow path as in the case of one control port in the related art. There is no possibility that the fluid should flow outside and the valve will not be established.

That is, the fluid is supplied at the first control port and the fluid is discharged at the second control port, so that the pressure can be reliably switched.

Thus, the valve can be established even when the drain flow path of the mating mounting member is open at one end of the mounting hole, so that the quality can be improved.

[0031]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the illustrated embodiment.

FIG. 1 shows a solenoid valve to which a control valve according to an embodiment of the present invention is applied. Reference numeral 1 denotes an entire solenoid valve. In this embodiment,
The spool 2 is driven using the electromagnetic attraction of the solenoid 3 to switch the supply of pressure to the actuator.

The general structure of the solenoid valve 1 includes a spool 2, a valve sleeve 5 as a valve body having a guide hole 4 into which the spool 2 is slidably inserted, and a solenoid 3 for reciprocatingly driving the spool 2. The valve sleeve 5 is provided with a mounting hole 7 of the mating mounting member 6.
Inserted and fixed inside.

The mating mounting member 6 has a control flow path 8 which is an output side to the actuator opened to the inner periphery of the mounting hole 7, a pressure supply flow path 9 which is a supply side to which the pressure oil of the pressure source is supplied, and And a discharge-side drain flow path 10 provided on the open end side.

The control flow path 8 and the pressure supply flow path 9 are configured such that when the solenoid valve 1 is mounted in the radial direction, the counterpart mounting member 6 is passed through in parallel from the solenoid 3 side at a predetermined axial distance in parallel. The position is shown in FIG.
Has been replaced. That is, the present embodiment relates to a valve in which a valve cannot be easily established in the related art.

The diameter of the mounting hole 7 of the mating mounting member 6 is
The pressure supply channel 9 has a small diameter.

On the other hand, the valve sleeve 5 has a first control port 11 and a second control port 12
And a drain port 14 opened at one end of the guide hole 4.

Second control port 12, first control port 11
The pressure supply port 13 has a configuration in which the valve sleeve 5 is passed in parallel in the radial direction from the solenoid 3 side at a predetermined interval in the axial direction.

The drain port 14 has a plurality of through holes 15A formed in a plate 15 having a substantially Ω-shaped cross section provided at the opening end of the guide hole 4. The plate 15 is attached to the opening end with the convex portion facing the spool 2.

The spool 2 is slidably inserted into the inner periphery of the guide hole 4.

The spool 2 has a first land 21 on the side of the plate 15 which slides on the inner periphery of the guide hole 4, and a solenoid 3.
Side second land portion 22 and the second land portion 22 and the first land portion 22.
Third land portions 23 provided between the land portions 21 and closer to the second land portions 22 are provided at predetermined intervals.

An annular first valve chamber 24 is provided between the first land portion 21 and the third land portion 23, and an annular second valve chamber 25 is provided between the third land portion 23 and the second land portion 22. Has formed.

Further, the spool 2 has a passage 26 formed therethrough on the center axis, and the passage 26 and the second
The second land portion 22 and the third land portion 2 communicating with the valve chamber 25
A communication passage 27 is formed so as to penetrate the side wall between the three in the radial direction.

The first land portion 21 is provided on the plate 15
And a concave portion 21A having an opening on the side.
The spring 16 is inserted in the
Has one end in contact with the bottom surface of the concave portion 21A and the other end in contact with the outer peripheral end surface of the convex portion of the plate 15 to urge the spool 2 toward the solenoid 3.

A protrusion 29 having a slit 28 communicating with the passage 26 is provided at an end of the spool 2 on the solenoid 3 side, and a rod 17 mounted on the solenoid 3 for transmitting a driving force is provided on the end surface thereof. In contact.

When the spool 2 reciprocates, the first land portion 21 opens and closes the pressure supply port 13, and the second land portion 22 opens and closes the second control port 12.
Between the first control port 11 and the pressure supply port 13 via the first valve chamber 24, the second valve chamber 25, the communication passage 27 and the passage 26
And selectively communicates between the second control port 12 and the drain port 14.

The outside diameter of the valve sleeve 5 into which the spool 2 configured as described above is inserted is large on the pressure supply port 13 side. The large-diameter pressure supply port 13 side of the valve sleeve 5 is connected to the mating mounting member 6.
The fitting hole 7 is fitted into the pressure supply channel 9 having a small diameter. Thus, the pressure supply flow path 9 and the control flow path 8 are isolated on the outer peripheral side of the valve sleeve 5.

At this time, the valve sleeve 5 of the solenoid valve 1 is assembled so that the pressure supply port 13 matches the pressure supply passage 9 and the first control port 11 and the second control port 12 match the control passage 8, respectively. .

The pressure supply port 13 and the pressure supply flow path 9 are substantially at the same position, and an annular concave groove 1 having a diameter larger than the diameter of the pressure supply port 13 is formed around the opening of the pressure supply port 13.
Eight.

On the other hand, the first control port 11, the second control port 12, and the control flow path 8 are arranged such that the control flow path 8 is located between the first control port 11 and the second control port 12. I have. The outer diameter of the valve sleeve 5 at the portion having the first and second control ports 11 and 12 is smaller than the pressure supply port 13 side, and the diameter of the mounting hole 7 at the portion having the control flow path 8 is Since the diameter is larger than the supply passage 9 side, an annular passage 19 is formed therebetween.

Here, the internal components of the solenoid 3 for driving the spool 2 will be briefly described without showing them.

The solenoid 3 has a well-known structure and is integrated with the valve sleeve 5. That is, the solenoid 3 is fixedly arranged with one end facing the inside of the valve sleeve 5, a coil arranged so as to surround the fixed core, and inserted into the coil inner periphery so as to be reciprocally movable coaxially with the fixed core. And a case 31 for accommodating the coil, and a connector 32 for supplying electricity to the coil.

A rod 17 is reciprocally inserted into the fixed iron core. One end of the rod 17 is connected to the plunger, and the other end is connected to the spool 2 in the valve sleeve 5. The spool 2 is pushed. That is, the push-type configuration is the same as that of the related art.

Next, the operation of the solenoid valve 1 having the above configuration will be described.

When the solenoid 3 is turned on, the plunger is magnetically attracted to the fixed iron core against the spring force of the spring 16 and pushes and moves the spool 2 via the rod 17, as shown in the left half of FIG. , 2nd land part 2
2, the second control port 12 is closed, and the first control port 11 and the pressure supply port 13 are communicated via the first valve chamber 24 so that the fluid from the pressure supply flow path 9 is passed through the annular passage 19.
To the control channel 8 via That is, a fluid pressure such as a hydraulic pressure is supplied.

On the other hand, when the solenoid 3 is turned off, the spool 2 is moved toward the solenoid 3 by the spring force of the spring 16, and as shown in the right half of FIG. 1 land part 21
The first control port 11 is closed between the first control port 11 and the third land portion 23, and the second control port 12 and the drain port 14 communicate with each other through the second valve chamber 25, the communication passage 27, and the passage 26. From the drain passage 10 through the annular passage 19
Drain the fluid. That is, fluid pressure such as hydraulic pressure is discharged.

As described above, the hydraulic pressure is switched (controlled) by the reciprocating movement of the spool 2.

In the control valve having the above-described configuration, the control port of the valve sleeve 5 that matches the control flow path 8 of the counterpart mounting member 6 is divided into a first control port 11 and a second control port 12. The first control port 11 and the pressure supply port 13 communicate with each other by the reciprocating movement of the spool 2, and the fluid from the pressure supply flow path 9 is supplied to the control flow path 8.
The control port 12 and the drain port 14 are communicated with each other, and are selectively switched so as to discharge from the control channel 8 to the drain channel 10.

From the above, the first control port 11 is a port only for supplying a fluid from the pressure supply channel 9 to the control channel 8, and the second control port 12 is a port for supplying the fluid from the control channel 8 to the drain channel 10. Because it is separate from the port that only discharges,
In the case of the prior art, the fluid to be supplied to the control flow path at the time of control flows to the outside and it is difficult to establish a valve. Even at the position where one end of the mounting hole of the side mounting member is opened (the position in the present embodiment), a valve that switches the pressure by using a push-type solenoid shown in the related art can be established.

Thus, the production can be facilitated, and the product specifications do not increase. As a result, the production efficiency can be improved.

Then, as described above, the first control port 1
The fluid is supplied at 1 and the fluid is discharged at the second control port 12, so that the pressure can be reliably switched and the valve can be established, thereby improving the quality. Can be achieved.

In FIG. 1, even if the positions of the control flow path 8 and the pressure supply flow path 9 of the mating mounting member 6 are switched, as shown in the right half of FIG.
What is necessary is just to make the structure which moves the position of the spool 2 at the time of OFF.

At this time, the pressure supply port 13 of the valve sleeve 5 serves as a first control port, and the first control port 11 serves as a pressure supply port.
When the solenoid 3 is turned off, the second control port 12 is closed between the third land portion 23 and the second land portion 22 by the first land portion 21 and the pressure supply port (the first control port 11) is closed. The fluid is discharged from the control channel 9 to the drain channel 10 by communicating between the (pressure supply port 13) and the drain port 14.

On the other hand, when the solenoid 3 is turned on, the operation is the same as that described above. Therefore, the second control port 12 is closed by the second land portion 22 and the pressure supply port ( A first valve chamber 24 is provided between the first control port 11) and the first control port (the pressure supply port 13).
The fluid from the pressure supply flow path 9 can be supplied to the control flow path 8 through the annular passage 19 through communication with the control flow path 8.

As described above, since the control flow path 8 and the pressure supply flow path 9 of the mating attachment member 6 can be in any position, they can be shared.

In this case, the operation is the same as that of the conventional arrangement of the control flow path and the pressure supply flow path shown in FIG. That is, although the second control port 12 becomes unnecessary, a valve having performance equivalent to that of the related art can be configured.

In the above-described embodiment, the push type in which the solenoid 3 presses the so-called spool 2 has been described as an example. However, the present invention is not limited to the push type. Can be applied.

Although the drive using the solenoid 3 as the driving means of the spool 2 has been described as an example, the means for driving the spool 2 is not limited to the solenoid 3, and other means using fluid pressure such as hydraulic pressure. Can be similarly applied.

[0069]

As described above, according to the present invention, the first control port is used to supply the fluid from the pressure supply channel communicating with the pressure supply port to the control channel by reciprocating the spool. Since the control port and the second control port for discharging the fluid from the control flow path communicating with the drain port to the drain flow path are divided, between the first control port and the pressure supply port, and between the second control port and the drain port Can be selectively communicated. Therefore, the supply and discharge of the fluid can be selectively performed, and the pressure can be switched.

As described above, the first control port is a port that only supplies the fluid from the pressure supply flow path that opens to the inner circumference of the mounting hole of the mating mounting member to the control flow path that similarly opens to the inner circumference of the mounting hole. Since the two control ports are separate from the ports that only discharge the fluid from the control flow path to the drain flow path opening at one end of the mounting hole, the fluid is supplied to the control flow path as in the case of one control port of the prior art. There is no possibility that the fluid should flow outside and the valve will not be established.

That is, the fluid is supplied at the first control port and the fluid is discharged at the second control port, so that the pressure can be reliably switched.

Thus, the valve can be established even when the drain flow path of the mating mounting member is open at one end of the mounting hole, so that the quality can be improved.

[Brief description of the drawings]

FIG. 1 is a fragmentary cutaway view showing a state where a solenoid valve as a control valve according to an embodiment of the present invention is mounted on a mating mounting member.

FIG. 2 is a fragmentary cutaway view of a main part of a solenoid valve, showing a state where the positions of the control flow path and the pressure supply flow path in the mating side mounting member of FIG. 1 are replaced with each other;

FIG. 3 is a fragmentary cutaway view showing a state where a conventional control valve is mounted on a counterpart mounting member.

FIG. 4 is a schematic view showing the operation of a spool in a valve body in which the positions of a control port and a pressure supply port are exchanged in the control valve of FIG. 3, and FIG.
At the time of FF, the same figure (b) has shown the time of solenoid ON.

FIG. 5 is a perspective view of another conventional control valve showing a state where the control flow path and the pressure supply flow path are replaced with respect to the counterpart mounting member of FIG. It is a fragmentary sectional view.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 solenoid valve 2 spool 21 first land portion 21A recess 22 second land portion 23 third land portion 24 first valve chamber 25 second valve chamber 26 passage 27 communication passage 28 slit 29 convex portion 3 solenoid 31 case 32 connector 4 guide Hole 5 Valve sleeve (valve body) 6 Counterpart mounting member 7 Mounting hole 8 Control flow path 9 Pressure supply flow path 10 Drain flow path 11 First control port 12 Second control port (pressure supply port) 13 Pressure supply port (No. 1 control port) 14 drain port 15 plate 15A through hole (drain port) 16 spring 17 rod 18 concave groove 19 annular passage

Claims (1)

(57) [Claims] A valve body having a guide hole therein; a pressure supply port and a control port which are axially separated from the valve body and open to the inner periphery of the guide hole; and which open at one end of the guide hole of the valve body. A drain port; and a spool slidably inserted into an inner periphery of the guide hole of the valve body. The pressure supply port is opened in the inner periphery of the attachment hole with the valve body in an attachment hole of a mating attachment member. In the pressure supply channel,
The control port is assembled to a control flow path that opens to the inner periphery of the mounting hole so that the drain port matches a drain flow path that opens to one end of the mounting hole, respectively. And the pressure supply port, and the pressure is switched by selectively communicating between the control port and the drain port. When the control port and the pressure supply port are in communication with each other, the fluid from the pressure supply flow path To the control channel,
On the other hand, a control valve configured to discharge fluid from the control channel to the drain channel when the control port and the drain port are in communication with each other, wherein the control port is reciprocated by the spool.
A first control port for supplying a fluid from the pressure supply channel communicating with the pressure supply port to the control channel, and discharging a fluid from the control channel communicating with the drain port to the drain channel. A control valve, wherein the control valve is divided into a second control port.