JPH0914497A - Spool valve - Google Patents

Abstract

PURPOSE: To provide a spool whose number of items and assembling steps are decreased, having a small size, high reliability, and long life. CONSTITUTION: A spool 3 is arranged in a spool chamber 15 provided with a plurality of ports 7 to 11, in a switchable manner to light and left positions. The spool 3 is made of stainless steel which is magnetic material, and formed with a piston 20 at its light end and a piston 21 at its left end. A first magnet 22 is arranged inside a light portion 5b of a driving part 5 to which the piston 20 is opposed at the light position. A second magnet 23 is arranged inside a light portion 6b of a driving part 6 to which the piston 21 is opposed at the left position. When the spool 3 is arranged at the light position, the piston 20 is magnetized by the first magnet 22 and the spool 3 is held there. When the spool 3 is arranged at the left position, the piston 21 is magnetized by the second magnet 23 and held there.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spool valve, and more particularly to a spool valve having a spool holding mechanism.

[0002]

2. Description of the Related Art A spool valve is used as a directional control valve for pneumatic control or the like. The spool arranged in the spool valve is of a metal type that does not have an elastic packing such as an O-ring on the outer peripheral surface thereof, that is, the surface facing the sliding surface of the sleeve. Since this metal type spool has higher wear resistance than a spool using an elastic packing, a long life of the spool valve can be obtained. Also, since the sliding resistance of the spool is low, stable responsiveness can be obtained over a long period of time. On the other hand, in the metal type spool valve, unlike the spool using the elastic packing, it is not possible to obtain the self-holding action of the spool position due to the sliding resistance of the elastic packing. Therefore, the metal type spool valve is provided with a detent mechanism for holding the spool at a predetermined position.

FIG. 4 is a cross section of a spool valve 40 equipped with one such detent mechanism. The sleeve 4 is provided in the body portion 43 of the valve body 41 having the plurality of intake / exhaust ports 42.
4 is inserted. Spool chamber 45 in sleeve 44
A spool 46 is slidably accommodated in the. A piston 47 is connected to the right end of the spool 46, and the piston 47 is housed in a piston chamber 49 of a drive unit 48. A piston 50 is connected to the left end of the spool 46, and the piston 50 is connected to the piston chamber 52 of the drive unit 51.
Housed within. The spool 46 has a right position where the piston 47 contacts the right end surface of the piston chamber 49, and
The piston 50 is driven between left positions where it abuts the left end surface of the piston chamber 52.

In the drive unit 51, a detent mechanism is provided between the spool 46 and the piston 50.
The detent mechanism is provided on the detent main body 53 fixed to the drive unit 51 side, a plurality of steel balls 54 movably held in the detent main body 53 in the radial direction of the axial center thereof, and on the outer peripheral side of each steel ball 54. And a shaft portion 56 connecting the spool 46 and the piston 50.
Each steel ball 54 is urged by a spring 55 toward the axial center of the detent body 53. Engagement grooves 57 and 58 are formed in the shaft portion 56 at two spaced positions.

When the spool 46 is located at the right position of the spool chamber 45, each steel ball 54 is engaged with the engaging groove 57.
And the spool 46 is held in the right position so that it does not move easily. Now, when the air is supplied to the piston chamber 49 and the air is exhausted from the piston chamber 52, the driving force in the direction from the right position to the left direction is applied to the spool 46 due to the pressure difference acting on the pistons 47 and 50. Works. Then, this driving force disengages each steel ball 54 from the engagement groove 57, and the spool 46 moves to the left.

When the spool 46 is driven to the left position,
The piston 50 contacts the left end surface of the piston chamber 52 and the spool 46 stops at the left position. When the spool 46 is placed in the left position, the steel balls 54 engage with the engaging grooves 58 almost at the same time. As a result, the spool 46 is held so as not to easily move from the left position. When the spool 46 is placed in the left position, the air supply to the piston chamber 49 is stopped, but the spool 46 remains held in the left position by the detent mechanism.

Similarly, each time the air for driving the spool 46 is alternately supplied to both piston chambers 49, 52, the spool 46 is switched from the right position to the left position or from the left position to the right position. Will be placed. Then, when the spool 46 is arranged at the right position or the left position, it is held so as not to easily move from that position.

[0008]

However, the spool valve 40 provided with such a detent mechanism has a problem that the spool valve 40 not requiring the detent mechanism is increased in size by the amount of the detent mechanism.

Further, since the detent mechanism is provided, the number of parts and the number of assembling steps increase. further,
Since there is a possibility that the detent mechanism may malfunction due to wear of the engagement grooves 57, 58, etc., there is a problem that the factor of failure increases and reliability decreases.

Further, since the force for holding the shaft portion 56 with time becomes weak due to wear of the engagement grooves 57, 58, there is a problem that the responsiveness changes. Furthermore, the sleeve 44 and the spool 4
6. Since the detent body 53 and the like have dimensional errors, the axis of the detent body 53 and the axis of the shaft portion 56 may not coincide with each other. However, since each steel ball 54 urges the shaft portion 56 to be located at the axial center position of the detent body 53, the spool 46 is urged away from the axial center of the spool chamber 45 to identify the spool chamber 45. It is strongly pressed against the side of. Therefore, in this state, the spool 46
Is repeatedly operated, the spool 46 and the sleeve 4
The specific side of 5 is unevenly worn and the airtightness is impaired at an early stage.
Further, a large amount of abrasion powder is generated, which impairs the sliding of the spool 46 and the sleeve 45 at an early stage.

The present invention has been made to solve the above problems, and an object thereof is to provide a spool valve having a small number of parts and a small number of assembling steps, a small size, a high reliability, and a long life. Especially.

[0012]

In order to solve the above problems, the invention according to claim 1 is characterized in that a spool accommodated in a spool chamber formed in a valve body provided with a plurality of ports is a spool. In a spool valve that is switchably arranged at the right position or the left position of the chamber to switch and communicate each port, a first magnetizing means for magnetically holding the spool at the right position and a second magnetically holding means for magnetically holding the spool at the left position. Magnetic attraction means is provided.

Further, in the invention described in claim 2, in the invention described in claim 1, the first magnetizing means has a spool formed of a magnetic material, and a right end portion of the spool faces the spool at the right position. Consisting of a first magnet provided on the valve body side,
The second magnetizing means is composed of the spool and a second magnet provided on the valve body side where the left end portion of the spool faces the left side position.

According to a third aspect of the present invention, in the first aspect of the present invention, the first magnetizing means is made of a magnetic material, and a spool in which a magnet is provided is provided at the right position. The right end of the spool comprises a first magnetized portion provided on the opposite valve body side, and the second magnetizing means is on the spool and on the valve body side where the left end of the spool opposes at the left position. The second magnetized portion is provided.

According to a fourth aspect of the invention, in the first aspect of the invention, the first magnetizing means is made of a non-magnetic material, and the first magnetized portion is formed at the right end portion thereof. The second magnetizing means is provided with a second magnetized portion at the left end thereof, and the first magnet is provided on the valve main body side facing the right end of the spool at the right position. In addition, the spool and the second magnet provided on the valve body side where the left end of the spool faces the spool at the left position.

According to a fifth aspect of the present invention, in the first aspect of the invention, the first magnetizing means is made of a non-magnetic material, and the spool is provided with the first magnet at the right end thereof. When,
At the right position, the right end portion of the spool comprises a first magnetized portion provided on the opposite valve body side, and the second magnetizing means has the spool having a second magnet at the left end portion thereof;
In the left position, the left end of the spool is composed of a second magnetized portion provided on the side of the valve body that faces the spool.

[0017]

Therefore, according to the first aspect of the present invention, when the spool is arranged at the right position in the spool chamber in the valve body, the first magnetic attachment means magnetically holds the spool at the right position. It Also, when the spool is placed in the left position,
The spool is magnetically held at the left position by the second magnetizing means. As a result, the spool is held in the right and left positions without relying on a mechanical detent mechanism.

According to the invention described in claim 2, in addition to the function of the invention described in claim 1, in the right position,
A spool formed of a magnetic material is magnetically held by a first magnet provided on the side of the valve body where the right end of the spool faces the spool. In the left position, the left end of the spool is magnetically held by the second magnet provided on the opposite valve body side.

According to the invention described in claim 3, in addition to the function of the invention described in claim 1, in the right position,
The spool, which is made of a magnetic material and has a magnet provided therein, is magnetically held by the first magnetized portion provided on the valve body side where the right end of the spool is opposed. In the left position, the left end of the spool is magnetically held by the second magnetized portion provided on the opposite valve body side.

According to the invention described in claim 4, in addition to the function of the invention described in claim 1, in the right position,
The spool, which is made of a non-magnetic material and has the first magnetized portion at its right end, is magnetically held by the first magnet provided on the valve body side where the right end of the spool is opposed. Further, at the left position, the spool having the second magnetized portion at the left end thereof is magnetically held by the second magnet provided at the valve main body side, the left end of which faces the spool.

According to the invention described in claim 5, in addition to the function of the invention described in claim 1, in the right position,
The spool, which is made of a non-magnetic material and has the first magnet at the right end thereof, is magnetically held by the first magnetized portion provided at the valve body side facing the right end of the spool. Further, at the left position, the spool having the second magnet at the left end thereof is magnetically held by the second magnetized portion provided at the valve main body side facing the left end thereof.

[0022]

【Example】

(First Embodiment) A first embodiment of the present invention will be described below with reference to FIG.

FIG. 1 shows a cross section of a 2-position 5-port type pneumatic directional control valve 1. The directional control valve 1 is composed of a valve body 2 and a spool 3. Valve body 2
Is composed of a body portion 4 and drive portions 5 and 6. In this embodiment, the body portion 4 is made of synthetic resin, and the driving portions 5 and 6 are made of ceramic.

The body 4 has a plurality of ports 7, 8, 9 on one side.
10 and 11 are formed, and the sleeve 12 is provided inside the body portion 4.
Is inserted. The sleeve 12 has ports 7-1
Openings 13 are formed at positions facing 1 respectively. Between the sleeve 12 and the body portion 4, each port 7-11
O-rings 14 are arranged at positions corresponding to the spaces,
Each O-ring 14 seals between the ports 7-11. A spool chamber 15 is formed in the sleeve 12,
The spool chamber 15 communicates with the outside through the ports 7 to 11. A sliding surface 16 is formed on the inner peripheral surface of the spool chamber 15. In this embodiment, the sleeve 12 is made of ceramic.

The spool 3 is housed in the spool chamber 15 so as to be movable in the left-right direction. The spool 3 has a sliding portion 17 formed at the center thereof, and sliding portions 18 and 19 are formed on both sides of the sliding portion 17, respectively. The sliding portions 17, 18 and 19 are adapted to come into sliding contact with the sliding surface 16 of the sleeve 12. The spool 3 is a so-called metal type that does not have elastic packing.

A piston portion 20 is formed at the right end of the spool 3 and a piston portion 21 is formed at the left end thereof. Each piston part 20, 21 also slides on the sliding surface 16 of the sleeve 12. Each piston part 2
Nos. 0 and 21 are also metal types having no elastic packing. In this embodiment, the spool 3 is made of magnetic material such as stainless steel.

A drive section 5 is provided on the right side of the body section 4, and a piston chamber 5a is formed inside the drive section 5. The piston portion 20 of the spool 3 is accommodated in the piston chamber 5a in a state where the piston portion 20 is not in sliding contact with the inner peripheral surface thereof. A drive portion 6 is provided on the left side of the body portion 4, and a piston chamber 6a is formed inside the drive portion 6. In the piston chamber 6a, the piston portion 21 of the spool 3 is
Is housed in a state where it does not come into sliding contact with its inner peripheral surface.

Therefore, in the spool 3, the position where the right end of the piston portion 20 contacts the right side surface of the piston chamber 5a (hereinafter,
It is configured to move between a right position) and a position where the left end of the piston portion 21 abuts on the left side surface of the piston chamber 6a (hereinafter referred to as the left position).

A first magnet 22 is arranged on the right side of the piston chamber 5a in the right side 5b of the drive unit 5. Then, the spool 3 moves to the right to move the piston portion 2
When 0 contacts the right side surface of the piston chamber 5a, the piston portion 20 is magnetically attached to the first magnet 22 and the spool 3 is held so as not to easily move from the right position.

A second magnet 23 is provided on the left side of the piston chamber 6a in the left side 6b of the drive unit 6. When the piston portion 21 of the spool 3 comes into contact with the left side surface of the piston chamber 6a, the piston portion 21 is magnetically attached to the second magnet 23 and the spool 3 is held so as not to easily move from the left position. In this embodiment, the spool 3 and the first magnet 22 compose the first magnetizing means, and the spool 3 and the second magnet 23 compose the second magnetizing means.

A passage 24 is connected to the piston chamber 5a and a passage 25 is connected to the piston chamber 6a. Then, the air is supplied to the piston chamber 5a through the flow path 24, and the air in the piston chamber 6a is discharged through the flow path 25. On the contrary, through the flow path 25, the piston chamber 6a
Is supplied to the piston chamber 5a, and the air in the piston chamber 5a is discharged through the flow path 24.

When air is supplied to the piston chamber 5a and air is discharged from the piston chamber 6a when the spool 3 is at the right position, the spool 3 is released from the magnetic attachment with the first magnet 22. Driven to the left. On the contrary, when the spool 3 is at the left position, when the air is supplied to the piston chamber 6a and the air is discharged from the piston chamber 5a, the spool 3 is released from the magnetic attachment with the second magnet 23 and is moved to the right. It is designed to be driven by.

When the spool 3 is arranged at the right position, the ports 7 and 8 are communicated between the sliding portion 17 and the sliding portion 18, and at the same time, between the sliding portion 17 and the sliding portion 19. The port 9 and the port 10 are communicated with each other. Further, when the spool 3 is arranged at the left position, the port 8 and the port 9 are communicated between the sliding portion 17 and the sliding portion 18, and at the same time, between the sliding portion 17 and the sliding portion 19. The port 10 and the port 11 are communicated with each other.

Next, the operation of the spool valve 1 configured as described above will be described. FIG. 1 shows a state in which the spool is arranged at the right position. In this state, the piston portion 20 of the spool 3 made of stainless steel is attached to the first magnet 22.
Is magnetically attached, and the spool 3 is held at the right position.
At this time, since the sleeve 12 is made of non-magnetic ceramic, the magnetized spool 3 is not magnetically attached to the sleeve 12. At the right position, the ports 7 and 8 are communicated with each other, and the ports 9 and 10 are communicated with each other.

When air is supplied from the flow path 24 and air is discharged from the flow path 25, both piston portions 2
Due to the pressure difference acting on 0 and 21, a driving force in the leftward direction acts on the spool 3. Then, due to this driving force, the spool 3 is released from being magnetically attached to the first magnet 22 and is driven leftward.

The spool 3 moves to the left to move the piston 2
When the left end of 1 contacts the left side surface of the piston chamber 6a, the spool 3 stops moving. Then, almost simultaneously with the contact of the piston portion 21 with the left end surface, the piston portion 21 is magnetically attached to the second magnet 23, and the spool 3 is held at the left position. When the spool 3 is arranged at the left position, the supply of air to the piston chamber 5a is stopped. However, since the piston portion 21 is magnetically attached to the second magnet 23, the spool 3 is held so as not to easily move from the left position. As a result, the port 8 and the port 9 are newly connected, and the port 10 and the port 11 are newly connected.

On the contrary, through the flow path 25, the piston chamber 6a
When the air is supplied to the piston chamber 5a and the air is discharged from the piston chamber 5a, the driving force in the rightward direction acts on the spool 3 due to the pressure difference acting on the piston portions 20 and 21. Then, due to this driving force, the spool 3 is released from being magnetically attached to the second magnet 23 and is driven rightward.

When the spool 3 moves to the right and the right end of the piston portion 20 contacts the right end surface of the piston chamber 5a, the spool 3 stops moving and the piston portion 20 is magnetically attached to the first magnet 22. To be done. As a result, the spool 3 is held at the right position, the ports 7 and 8 are communicated again, and the ports 9 and 10 are communicated again.

As described in detail above, according to the spool valve 1 of this embodiment, the right side portion 5b of the drive portion 5 is in the right position.
The piston portion 20 of the stainless steel spool 3 is magnetically attached by the first magnet 22 provided in the above to hold the spool 3 in the right position. In the left position, the second magnet 23 provided on the left side portion 6b of the drive unit 6 also magnetically attaches the piston portion 21 to hold the spool 3 in the left position. Therefore, a mechanical detent mechanism such as the spool valve of the conventional example is not required, so that the spool valve 1 can be downsized. Further, since the detent mechanism is not provided, the structure can be simplified and the number of parts and the number of assembling steps can be reduced. Further, since the failure factors are reduced, the reliability of the spool valve can be increased.

Further, in this embodiment, since the spool 3 is held by the magnetic attachment between the magnets 22 and 23 and the piston portions 20 and 21, the holding force does not change for a long period of time. As a result, the driving force required to drive the spool 3 does not change, so that the responsiveness of the spool 3 can be kept constant for a long period of time, and stable operation characteristics can be obtained.

Furthermore, in this embodiment, unlike the conventional detent mechanism, no force is exerted on the retained spool 3 in its radial direction, so that each sliding portion 1
It is possible to prevent 7, 18, 19 from being pressed against a specific side of the spool chamber 15. As a result, the sliding part 1
Since it is possible to prevent uneven wear of 7, 18, 19 and the sliding surface 16, it is possible to maintain good airtightness between the spool 3 and the sleeve 12 for a long period of time. Furthermore, since it is possible to prevent the generation of wear powder due to uneven wear,
It is possible to obtain stable operating characteristics of the spool 3 for a long period of time.

Further, in this embodiment, the spool 3 is of a metal type in which the sliding parts 17, 18 and 19 are not provided with elastic packing, and the piston parts 20 and 21 are also made of metal without elastic packing. Typed. As a result, even during long-term use, it is possible to prevent changes in the response time of the spool 3 due to wear and swelling of the elastic packing, and to prevent malfunctions due to wear and swelling.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIG. In this embodiment,
In the first embodiment, the spool 30 is provided with the magnet 30, and the first magnet 22 is attached to the first magnetized portion 31 and the second magnet 22 is attached to the second magnetized portion 31.
The only difference is that the magnet 23 is changed to the second magnetized portion 32. Therefore, the same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIG. 2, a magnet 30 is embedded inside the left end of the spool 3. Since the spool 3 is made of stainless steel, the pistons 20 and 21 are magnetized by the magnet 30.

In this embodiment, the first magnetized portion 31 and the second magnetized portion 32 are each made of stainless steel which is a magnetic material. When the piston portion 20 of the spool 3 comes into contact with the right side surface of the piston chamber 5a, the magnetized piston portion 20 is magnetically attached to the first magnetized portion 31 and is held so as not to easily move from the right position. It When the piston portion 21 contacts the left side surface of the piston chamber 6a, the magnetized piston portion 21 is magnetically attached to the second magnetized portion 32 and is held so as not to easily move from the left position. Has become. In this embodiment, the spool 3 and the first magnetized portion 31
Constitutes the first magnetizing means, and the spool 3 and the second magnetized portion 32 constitute the second magnetizing means.

When air is supplied to the piston chamber 5a and air is discharged from the piston chamber 6a when the spool 3 is at the right position, the spool 3 is released from being magnetically attached to the magnetized portion 22. Driven to the left. On the contrary, when the spool 3 is at the left position and the air is supplied to the piston chamber 6a and the air is discharged from the piston chamber 5a, the spool 3 is released from the magnetic attraction with the second magnetized portion 32. Drive to the right.

In the spool valve 1 constructed as above, since the magnet 30 is provided inside the spool 3 made of stainless steel, the entire spool 3 is magnetized and the piston portions 20 at both ends of the spool 3 are magnetized. , 21 are magnetized. When the spool 3 is placed in the right position, the magnetized piston portion 20 is magnetically attached to the magnetized portion 22, and the spool 3 is held in the right position. At this time, since the sleeve 12 is made of non-magnetic ceramic, the magnetized spool 3 is not magnetically attached to the sleeve 12. When the spool 3 is arranged at the left position, the piston portion 21 is magnetically attached to the magnetized portion 21, and the spool 3 is held at the left position.

When a driving force in the left direction acts on the spool 3 held at the right position, the spool 3 is released from the magnetically attached state and is driven leftward. At this time, since the spool 3 is not magnetically attached to the sleeve 12, the spool 3 is smoothly driven by the driving force. When a driving force in the right direction is applied to the spool 3 held at the left position, the spool 3 is released from the magnetically attached state and is driven to the right.

Therefore, according to this embodiment, the same effect as that of the first embodiment can be obtained. (Third Embodiment) Next, a third embodiment of the present invention will be described with reference to FIG. Since this embodiment is different from the first embodiment only in the following points, the same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

That is, the spool 3 is made of ceramic which is a non-magnetic material. A first magnetized portion 40 made of stainless steel, which is a magnetic material, is provided at the right end of the spool 3, and a second magnetized portion 41 is similarly embedded at the left end. Further, the sleeve 12 is made of stainless steel which is a magnetic material. In this embodiment, the spool 3 and the first magnet 22 compose the first magnetizing means, and the spool 3 and the second magnet 23 compose the second magnetizing means.

When the spool 3 is arranged at the right position, the first magnetized portion 40 is magnetically attached to the magnet 22 and the spool 3 is held at the right position. At this time, the spool 3 is formed of a non-magnetic ceramic material, and the first magnetized portion 40 that is magnetized by the magnet 22 and is magnetized is in a position away from the sleeve 12, so that the spool 3 is The sleeve 12 is not magnetically attached.

Similarly, when the spool 3 is arranged at the left position, the second magnetized portion 41 is magnetically attached to the magnet 23 and the spool 3 is held at the left position. When the spool 3 moves between the right position and the left position, both the magnetized parts 40 and 41 are not magnetized, so that the spool 3 is not magnetically adhered to the sleeve 12. As a result, the spool 3 is driven smoothly.

The present invention is not limited to the above embodiment, but may be configured as follows. (1) In the first embodiment, the spool 3 may be changed to a magnetic material other than stainless steel that can be magnetically attached to the magnet. Further, the magnet 30 may be embedded in the spool 3. Alternatively, only the piston portions 20 and 21 of the spool 3 may be made of a magnetic material, and the space between the piston portions 20 and 21 may be made of a non-magnetic material. The sleeve 12 is made of a non-magnetic material other than ceramic,
For example, non-magnetic stainless steel or synthetic resin may be used instead.

(2) In the second embodiment, one or both of the magnetized portions 31, 32 may be magnets. That is,
The magnet is embedded so as to be magnetically attached to the spool 3 magnetized by the magnet.

Further, the magnetized portions 31, 32 may be replaced with a magnetic material other than stainless steel. Further, the sleeve 12 may be replaced with a non-magnetic material other than ceramic. (3) In the second embodiment, the spool 3 is made of a non-magnetic material, the first magnet is provided at the right end, and the second magnet is provided at the left end.
The magnet may be provided. That is, the first magnetizing means is composed of the spool 3 and the first magnetized portion 31, and the second magnetizing means is the spool 3 and the second magnetized portion 32.
And Further, in this case, both magnetized parts 31, 3
One or both of the two may be replaced with a magnet.

(4) In the third embodiment, the spool 3
May be replaced with a non-magnetic material other than ceramic. Further, the sleeve 12 may be replaced with a magnetic material other than stainless steel.
Further, the sleeve 12 may be made of a non-magnetic material. In this case, one or both of the magnetized portions 40 and 41 may be replaced with magnets.

(5) The present invention may be applied to a spool valve of a type in which each sliding portion 17, 18, 19 is provided with an elastic packing such as an O-ring. (6) You may implement in the spool valve of the number of ports other than 5 ports.

(7) Without the sleeve 12, the valve body 2
It may be implemented in a spool valve of the type in which the spool chamber 15 is directly formed inside. (8) In each of the embodiments, each piston portion 20, 21 may be a piston provided with an elastic packing.

(9) The spool valve drive system may be any of an electromagnetic pilot system, a direct drive system using an electromagnetic solenoid, a switching system using a lever or the like, and a mechanical system using a cam or the like. The technical ideas other than the claims that can be understood from the above-described embodiments will be described below along with their effects.

(1) In the spool valve according to the first aspect, the spool 3 is a metal type that does not use elastic packing. With such a configuration, the holding force of the spool 3 can be stabilized for a long period of time.

(2) In the above spool valve, the piston portions 20 and 21 provided at both ends of the spool 3 for driving the spool 3 by fluid pressure are metal type without using elastic packing.

According to this structure, since the elastic packing is not used at all in the spool valve 1 for driving the spool 3 by the fluid pressure, the operating characteristics due to the abrasion and deterioration of the elastic packing. Can be prevented from worsening. That is, the responsiveness of the spool 3 can be stabilized for a long period of time. Also, high reliability can be obtained.

[0063]

As described above in detail, according to the inventions described in claims 1 to 5, the number of parts and the number of assembling steps can be reduced, the size can be reduced, the reliability can be improved, and the long life can be obtained. it can.

According to the invention described in claims 4 and 5,
In addition to the above effects, since the spool can be formed of a lightweight non-magnetic material, high responsiveness of the spool can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a spool valve according to a first embodiment.

FIG. 2 is a schematic sectional view of a spool valve according to a second embodiment.

FIG. 3 is a schematic sectional view of a spool valve according to a third embodiment.

FIG. 4 is a schematic cross-sectional view of a conventional spool valve.

[Explanation of symbols]

2 ... Valve body, 3 ... Spools as first and second magnetizing means, 7 to 11 ... Port, 15 ... Spool chamber, 22 ... First magnet as first magnetizing means, 23 ... Second Second magnet as magnetizing means, 30 ... Magnet, 31 ... First magnetized portion as first magnetizing means, 32 ... Second magnetized portion as second magnetizing means , 40 ... First magnetized part, 41 ...
Second magnetized part.

Claims (5)

[Claims] 1. A spool (3) housed in a spool chamber (15) formed in a valve body (2) provided with a plurality of ports (7 to 11) is connected to the right of the spool chamber (15). In a spool valve for switching and communicating each port (7 to 11) by switching to the position or the left position, first spooling means for magnetically holding the spool (3) in the right position and the spool (3 in the left position). ) Is attached to a spool valve provided with a second magnetizing means. 2. The first magnetizing means is provided on the valve body (2) side where the right end of the spool (3) faces the spool (3) made of a magnetic material at the right position. The second magnetizing means comprises a magnet (22), and the second magnetizing means is provided with a second magnet (provided on the valve body (2) side where the left end of the spool (3) faces the spool (3) at the left position. 23)
The spool valve according to claim 1, comprising: 3. The first magnetizing means is made of a magnetic material,
From a spool (3) provided with a magnet (30) therein, and a first magnetized portion (31) provided on the valve body (2) side facing the right end of the spool (3) at the right position. The second magnetizing means includes the spool (3) and a second magnetized portion (32) provided on the valve body (2) side where the left end of the spool (3) faces the left position. The spool valve according to claim 1, wherein the spool valve comprises: 4. A spool (3) having a first magnetized portion (40) at its right end, the first magnetizing means being formed of a non-magnetic material, and a spool (3) at the right position. Of the first magnet (2) provided on the valve body (2) side where the right end of the
2) and the second magnetizing means has a second magnet at the left end thereof.
And a second magnet (23) provided on the side of the valve body (2) facing the left end of the spool (3) at the left position. The spool valve according to claim 1. 5. The spool (3), wherein the first magnetizing means is made of a non-magnetic material and has a first magnet at the right end thereof.
And a first magnetized portion provided on the side of the valve body (2) facing the right end of the spool (3) at the right position, and the second magnetizing means has a second magnetized portion at its left end. The spool according to claim 1, comprising the spool (3) provided with a magnet, and a second magnetized portion provided on the valve body (2) side where the left end portion of the spool (3) is opposed at the left position. valve.