JPH017900Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an improvement of a fluid control valve, and is equipped with a detent device that holds the spool in a fixed position without being affected by external vibrations or shocks when the spool driving force is removed. This invention relates to improvements in fluid control valves.

(Prior art) Conventionally, in order to simplify the structure of a detent device for a fluid control valve, for example,
As shown in the figure, a plurality of annular grooves are formed at predetermined intervals in the end of the spool, and two or more holes are bored in the radial direction in a sleeve into which the end of the spool is slidably inserted. At the same time, an annular groove connected to the outside of the hole is provided, a sphere is housed in the hole, and an O-ring is housed in the annular groove, and a detent load is applied to the sphere by the elastic force of the O-ring. There is something configured like this.

In a fluid control valve equipped with such a conventional detent device, the air in the space formed between the spool end and the sleeve does not escape, and compression and decompression are performed by moving the spool, and the fluid control valve is There are disadvantages such as malfunction or unstable operation.

(Purpose of the invention) The present invention has been made in view of the above, and it solves the above-mentioned drawbacks by providing a through hole in the end of the spool that makes up the guide part for communication between the inside of the end and the fluid chamber. The purpose is to provide a control valve.

The present invention will be explained below with reference to examples.

(Structure of an embodiment of the invention) FIG. 1 is a sectional view showing an embodiment of the invention.

The spool 1 is arranged inside the valve body 2, and the spool 1
By moving in the axial direction, the connection between the grooves 4 formed in the valve body 2 is switched by the land 3 of the spool 1, thereby functioning as a fluid control valve. Note that 5 is a fluid chamber.

An electromagnetic solenoid 6 is installed at both ends of the valve body 2.
The screw-in portions 7a, 7b of the valves 6a, 6b are inserted and screwed together, and the electromagnetic solenoids 6a, 6b and the valve body 2 are sealed with O-rings 8a, 8b.

Threaded portions 7a of electromagnetic solenoids 6a, 6b,
7b is formed into a cylindrical shape, and its tip is brought into contact with the stepped portions 2a and 2b of the valve body 2. A sleeve 9a is fitted into the inner hole of the threaded portion 7a of the electromagnetic solenoid 6a, and a sleeve 9b is fitted into the inner hole of the threaded portion 7b of the electromagnetic solenoid 6b. The tip end surface of the sleeve 9a is connected to the stepped portion 2a of the valve body 2.
A part of the distal end surface of the sleeve 9b is brought into contact with the stepped portion 2b of the valve body 2.

One end 1 constituting the guide part of the spool 1
a is slidably inserted into the inner hole of the sleeve 9a. A plunger 11a of an electromagnetic solenoid 6a is inserted into the inner hole 10a of the end 1a of the spool 1, and when the electromagnetic solenoid 6a is energized, the plunger 11a protrudes and its tip collides with the end surface of the inner hole 10a of the end of the spool 1. The spool 1 is moved to the right when the spool 1 is moved to the right. Sleeve 9b
The plunger 11 of the electromagnetic solenoid 6b is located in the inner hole of the
b is inserted, and when the electromagnetic solenoid 6b is energized, the plunger 11b protrudes, and its tip contacts the end surface 1 of the spool 1 with the tip surface of the sleeve 9b.
The spool 1 is configured so as to move the spool 1 to the left upon collision with the spool 1b.

On the other hand, as shown in FIG.
It is brought into contact with the right end surface 6c of a. Therefore,
The tip of the sleeve 9a abuts against the stepped portion 2a of the valve body 2, and the position of the sleeve 9a is maintained at a fixed position from the valve body 2 without any gap in the axial direction.

On the other hand, two holes 12a and 12b are bored in the sleeve 9a in the radial direction, and
An annular groove 13 is formed on the circumferential surface of the sleeve 9a and is connected to the holes 12a and 12b. Hole 12
Spheres 14a and 14b are inserted into a and 12b, respectively, and an O-ring 15 is fitted into the annular groove 13. As a result, the spheres 14a and 14b are pressed toward the spool 1 by the elastic force of the O-ring 15.

An annular groove 16a is formed on the circumferential surface of the end portion 1a of the spool 1.
and 16b are provided at intervals equal to the travel distance of the spool 1 necessary to switch the flow path of the fluid control valve by the movement of the spool 1, and furthermore, an inner hole of the spool 1 is provided at the base of the end 1a of the spool 1. Through hole 18a for communicating with the outside of the spool 1
and 18b are bored, and the inner hole of the spool 1 and the fluid chamber 5 are communicated through the through holes 18a and 18b.

(Operation of one embodiment of the present invention) In the present invention configured as described above, when only the electromagnetic solenoid 6b is excited, the electromagnetic solenoid 6b
The plunger 11b protrudes and collides with the spool 1, and the spool 1 moves to the left from the position shown in FIG. It will be in communication with hole U. In this state, even if the electromagnetic solenoid 6b is de-energized, the position of the spool 1 is maintained. In this case, the spheres 14a and 14b fit into the groove 16b provided in the end 1a of the spool 1, so that the spheres 14a and 14b
The elastic force of the O-ring 15 is applied to 4a and 14b to ensure the accurate position of the spool 1, and the end 1a of the spool 1, the sleeve 9a, and the right end surface of the electromagnetic solenoid 6a are attached through the through holes 18a and 18b. 6c is communicated with the fluid chamber 5 and the pressure is equalized.

Next, when the electromagnetic solenoid 6a is energized from the above state, the plunger 11a protrudes and collides with the bottom of the end inner hole 10a of the spool 1, and the spool 1 moves to the state shown in FIG. The oil passage hole P is in communication with the oil passage hole Q, and the oil passage hole P is in communication with the oil passage hole Q. In this state, even if the electromagnetic solenoid 6a is de-energized, the above spool position is maintained. In this case, the spheres 14a and 14b fit into the groove 16a provided in the end 1a of the spool 1, and the elastic force of the O-ring 15 is applied to the spheres 14a and 14b, ensuring accurate positioning of the spool. Ru. Further, as the spool 1 moves to the right, fluid flows into the space between the end 1a of the spool 1, the sleeve 9a, and the electromagnetic solenoid 6a through the through holes 18a and 18b, and the fluid chamber 5 and the space are connected to each other. The pressure will be equalized.

(Effects of the invention) As explained above, by providing a through hole at the spool end that communicates the inside of the spool end with the fluid chamber, there is no sealing part, and air release during air release is improved. This eliminates the possibility of the fluid control valve malfunctioning.

Furthermore, although it is difficult to bleed air from a single electromagnetic solenoid, air within the electromagnetic solenoid can also be bleed due to the above-mentioned communication when assembled.

Further, since it is only necessary to provide a through hole at the end of the spool for communication, it is easy to add it to a conventional fluid control valve.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention. Second
The figure is an enlarged sectional view taken along the line A-A in FIG. FIG. 3 is a perspective view showing an example of an elastic body. DESCRIPTION OF SYMBOLS 1...Spool, 1a...End part, 2...Valve body, 5...
Fluid chamber, 6a and 6b...electromagnetic solenoid, 9a
and 9b...sleeve, 12a and 12b...
hole, 13... annular groove, 14a and 14b... sphere,
15...O ring, 17...elastic body, 18a and 1
8b...Through hole.

Claims (1)

[Scope of utility model registration request] A plurality of annular grooves are formed at predetermined intervals on the outer periphery of the spool end having a plunger insertion hole into which a plunger of an electromagnetic solenoid for driving the spool is inserted;
Two or more holes in the radial direction are bored in the sleeve into which the end of the spool is slidably inserted, and an annular groove connected to the outside of the hole is formed, and a sphere is housed in the hole, and A fluid control valve equipped with a detent device formed by storing an O-ring in an annular groove of a sleeve, in which a through hole is bored at the end of the spool to communicate a plunger insertion hole at the end of the spool with a fluid chamber. A fluid control valve characterized by: