JP2022092800A - Electromagnetic valve - Google Patents

Abstract

To configure an electromagnetic valve that, when energization of a solenoid is stopped, can reliably separate a movable core and a stationary core from each other.SOLUTION: An electromagnetic valve comprises: a cylindrical solenoid 5 that is centered on an axis X; a stationary core 6 that is arranged in an internal space of the solenoid 5; a movable core 7 that is arranged in the internal space S of the solenoid 5 and is sucked toward the stationary core 6 during energization of the solenoid 5; and a regulation member 16 that forms a gap between the movable core and the stationary core 6. An actuation rod 8 actuating integrally with the movable core 7 is arranged in a through hole H formed in the stationary core 6, and the regulation member 16 has a cylindrical shape into which the actuation rod is inserted and is provided on the side of a surface of the stationary core 6 opposite to the movable core 7. The movable core 7 has a plurality of respiratory pores 7a formed at positions overlapping the regulation member 16 when viewed in a direction along the axis X, and the respiratory pores communicate with the gap formed between the movable core 7 and the stationary core 6.SELECTED DRAWING: Figure 1

Description

The present invention relates to a solenoid valve.

Patent Document 1 describes an electromagnetic valve that operates a spool or the like with the operation of a movable core by energizing a solenoid and causing a magnetic flux from a fixed core to act on the movable core.

The solenoid valve described in Patent Document 1 has a housing provided with a movable core that operates linearly integrally with the valve shaft, and has a solenoid portion at a position surrounding the movable core to guide magnetic flux from the solenoid portion. The fixed core is located on the side of the working end of the movable core.

In Patent Document 1, by providing a magnet killer made of a non-magnetic material at a position facing the fixed core among the movable cores, the movable core is attracted to the fixed core due to the influence of residual magnetism after the energization of the solenoid is stopped. It prevents the inconvenience that the state of being continued is prevented.

Japanese Unexamined Patent Publication No. 2009-85321 (paragraph number [0021])

However, in the technique of Patent Document 1, when the solenoid is energized, the gap portion between the movable core and the fixed core becomes a negative pressure, and the responsiveness when the movable core is separated from the fixed core may be deteriorated. ..

For this reason, there is a demand for a solenoid valve capable of reliably separating the movable core and the fixed core when the energization of the solenoid is stopped.

The characteristic configuration of the electromagnetic valve according to the present invention is a cylindrical solenoid centered on a shaft core, a fixed core in which at least a part thereof is arranged in the internal space of the solenoid, and a shaft core direction between the fixed core and the solenoid. A movable core that is arranged in the internal space of the solenoid so as to face the solenoid and is attracted to the fixed core side along the direction along the axis by the magnetic force acting from the fixed core when the solenoid is energized, and the solenoid. A solenoid member provided with a regulating member made of a non-magnetic material that forms a gap between the movable core and the fixed core by abutting against the movable core when energized is provided with an operating rod that operates integrally with the movable core. The restricting member is arranged on a coaxial core with the shaft core through a through hole formed in the fixed core, and the restricting member has a cylindrical shape in which the actuating rod is inserted therein, and has a tubular shape with the movable core in the fixed core. The movable core is provided on the facing surface side, and the movable core is formed with a plurality of breathing holes in a position parallel to the shaft core at a position overlapping the cylindrical restricting member in a directional view along the shaft core. At the point where the gap formed between the movable core and the fixed core and the breathing hole communicate with each other when the solenoid is energized.

According to this characteristic configuration, when the solenoid is energized and the movable core approaches the end yoke portion of the fixed core, the restricting member abuts on the moving end side of the movable core, and a gap is created between the fixed core and the movable core. The inconvenience that the fixed core and the movable core are in close contact with each other is eliminated. Further, since the regulating member is made of a non-magnetic material, even if magnetism remains on the fixed core after the solenoid is energized, the inconvenience of magnetically adsorbing the movable core does not occur. In addition, since the breathing holes and gaps formed in the movable core communicate with each other, when the movable core moves, hydraulic oil or air flows between the gaps and the breathing holes to allow the movable core to operate quickly. to enable.
Therefore, a solenoid valve capable of reliably separating the movable core and the fixed core when the energization of the solenoid is stopped is configured.

As a configuration in addition to the above configuration, a breathing oil passage formed between the through hole formed in the fixed core and the working rod or inside the working rod is provided, and the movable oil passage is provided when the solenoid is energized. The gap formed between the core and the fixed core, the breathing hole, and the breathing oil passage may communicate with each other.

According to this, when the movable core moves, the hydraulic oil flows between the gap and the respiratory oil passage, which enables the rapid operation of the movable core.

As a configuration added to the above configuration, the movable core is urged in the axial core direction at a position opposite to the side on which the fixed core is arranged with respect to the movable core along the axial core direction. A spring chamber for accommodating the spring is formed, and the breathing hole may penetrate from the end face on the fixed core side of the movable core to the end face on the spring chamber side.

According to this, when the movable core is operated, air or oil in the spring chamber flows through a plurality of breathing holes, so that the movable core can be smoothly operated quickly.

As a configuration added to the above configuration, a convex portion protruding in the circumferential direction along the axial direction and a concave portion recessed in the axial direction are provided on the edge of the restricting member on the movable core side. It may be formed alternately.

According to this, when the end edge on the contact side of the restricting member abuts on the movable core, a plurality of convex portions abut on the movable core, and the concave portion creates a gap between the movable core and the restricting member. It is possible to suppress the inconvenience that the contact portion of the above is in close contact with the movable core.

It is sectional drawing of the coil unit part of a solenoid valve. It is sectional drawing of the coil unit part at the time of energization of a solenoid valve. It is a perspective view of the regulation member of another embodiment (a).

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Basic configuration]
As shown in FIG. 1, an electromagnetic valve including a coil unit C, a spool 1 operated by the driving force of the coil unit C, a valve housing 2 for accommodating the spool 1, and a spool spring 3 for urging the spool 1. V is configured.

Although not shown in FIG. 1, the spool 1 is formed with a land portion for controlling hydraulic oil, and the valve housing 2 is formed with a plurality of ports for supplying and discharging hydraulic oil. By energizing the solenoid 5 of the coil unit C from such a configuration, the spool 1 is operated in the direction along the shaft core X as shown in FIG. 2, and the supply / discharge of hydraulic oil is controlled.

The solenoid valve V is not limited to operating the spool 1, and may be configured to open and close a poppet valve or a check valve, for example.

[Coil unit]
As shown in FIGS. 1 and 2, the coil unit C has a cylindrical solenoid 5 formed in a region surrounding a cylindrical internal space S centered on a shaft core X, and a magnetic flux generated when the solenoid 5 is energized. A fixed core 6 made of a magnetic material that guides the It includes an actuating rod 8 that transmits the actuating force of the core 7 to the spool 1.

The coil unit C holds a support 9 arranged on the opposite side of the operating rod 8 with respect to the movable core 7 in the internal space S, and a compression coil type holding member arranged between the support 9 and the movable core 7. It is equipped with a spring 10 (an example of a spring). Further, a spring chamber is formed between the support 9 and the movable core 7, and the holding spring 10 is housed in the spring chamber, and the breathing hole 7a of the movable core 7 communicates with the spring chamber.

The solenoid 5 has a structure in which a coil 5b made of a good conductor is wound around a bobbin 5a made of a non-magnetic material such as a resin material, and a part of the inner circumference of the bobbin 5a is exposed to the internal space S.

The fixed core 6 is formed on the annular yoke portion 6a surrounding the outer periphery of the solenoid 5, the annular first wall-shaped yoke portion 6b arranged on the side where the spool 1 is arranged in the direction along the axis X, and the axis X. The second wall-shaped yoke portion 6c arranged on the opposite side of the first wall-shaped yoke portion 6b in the along direction, and the ends arranged in the region extending from the inner circumference of the first wall-shaped yoke portion 6b to the inner circumference of the bobbin 5a. It is composed of a portion yoke portion 6d and a tubular yoke portion 6e arranged in a region extending from the inner circumference of the second wall-shaped yoke portion 6c to the inner circumference of the bobbin 5a.

In this fixed core 6, the annular yoke portion 6a, the first wall-shaped yoke portion 6b, the second wall-shaped yoke portion 6c, the end yoke portion 6d, and the tubular yoke portion 6e are all magnetic of iron or the like. It is made up of materials. Further, a through hole H through which the operating rod 8 is inserted is formed in the end yoke portion 6d with a coaxial core with the shaft core X. In particular, with the actuating rod 8 inserted through the through hole H, a cylindrical space is formed between the inner circumference of the through hole H and the outer circumference of the actuating rod 8, and this space is used when the movable core 7 operates. It functions as a breathing oil passage that enables the flow of hydraulic oil. A hollow member is used as the operating rod 8, and a communication hole for communicating the space on the inner diameter side of the regulating member 16 and the inside of the operating rod 8 is formed in the operating rod 8 so that the inside of the operating rod 8 is formed. It may function as a breathing oil passage.

In particular, an internal space S is formed on the inner peripheral side of a part of the end yoke portion 6d and on the inner peripheral side of the tubular yoke portion 6e, and in this internal space S, the end yoke portion 6d and the support 9 are formed. The movable core 7 is arranged in the area sandwiched between the two. The movable core 7 is formed into a cylinder having an outer diameter slightly smaller than the inner diameter of the inner space S, so that the movable core 7 can move along the axis X with respect to the inner space S.

The movable core 7 has a concave portion formed on the opposite side of the side on which the actuating rod 8 is arranged, and the holding spring 10 has one end fitted into the concave portion of the movable core 7 and the other end side on the inner surface of the support 9. It is in contact. Further, in the movable core 7, a plurality of breathing holes 7a in a posture along the axis X are formed in a through hole shape.

The coil unit C has a structure that allows a part of the hydraulic oil to flow into the internal space S, and when the movable core 7 operates, the hydraulic oil flows inside the breathing hole 7a, so that the movable core 7 is operated. Allows smooth operation of. As shown in FIGS. 1 and 2, one end of the breathing hole 7a communicates with the gap formed between the end yoke portion 6d of the fixed core 6 and the movable core 7, and the other end is described above. It communicates with the spring chamber.

[Regulatory member]
In the coil unit C, the surface of the movable core 7 facing the end yoke portion 6d is referred to as the movable core end surface 7s, and the surface of the end yoke portion 6d facing the movable core 7 is referred to as the yoke end surface 6s. .. In particular, in the end yoke portion 6d of the fixed core 6, a fitting holding portion 15 having an enlarged inner diameter of the through hole H in the vicinity of the yoke end surface 6s is formed, and one end thereof is inserted into the fitting holding portion 15. The tubular regulating member 16 is provided in the fitted state. From such a configuration, the operating rod 8 is arranged inside the regulating member 16.

The regulating member 16 is formed of a non-magnetic material such as stainless steel, and the edge of the protruding end 16a of the regulating member 16 protrudes from the yoke end surface 6s in the direction of the movable core 7 by a set amount T. There is. Further, the protruding end 16a of the regulating member 16 is tapered so as to reduce the contact area. The regulating member 16 may use a resin material in addition to the stainless steel material.

In particular, in the directional view along the axis X, the protruding end 16a having a circumferential shape of the regulating member 16 is arranged at a position where it overlaps with the virtual circle in which the plurality of breathing holes 7a are arranged. More specifically, the end on the inner diameter side of the protruding end 16a is arranged on the side farther from the shaft core X than the end on the shaft core X side of the breathing hole 7a, and is located on the outer diameter side of the protruding end 16a. The end portion is arranged closer to the shaft core X than the end portion on the side farther from the shaft core X of the breathing hole 7a. As a result, as shown in FIG. 2, when the movable core end face 7s is closest to the yoke end face 6s, an internal space S is formed between the working rod 8 and the wall surface of the through hole H via the breathing hole 7a. It communicates with the space (breathing oil passage) that communicates with the outside.

Further, by forming a notch (slit) in a posture along the axis X at the end portion of the regulating member 16 on the proximal end side (the side closer to the spool 1), the proximal end portion can be elastically deformed in the radial direction. The base end portion of the restricting member 16 may be crimped to the inner surface of the fitting holding portion 15 by an elastic force.

FIG. 1 shows a coil unit C (when the solenoid 5 is not energized) in an OFF state in which no current is supplied to the coil 5b of the solenoid 5. When the solenoid 5 is in the OFF state in this way, the urging force acting on the spool spring 3 acting on the spool 1 acts on the movable core 7 from the operating rod 8, so that the urging force of the holding spring 10 is resisted. , The state in which the movable core end surface 7s is separated from the yoke end surface 6s is maintained.

FIG. 2 shows a coil unit C (when the solenoid 5 is energized) in an ON state in which a current is supplied to the coil 5b of the solenoid 5. When the solenoid 5 is in the ON state in this way, the movable core 7 is operated by the magnetic force acting on the movable core 7 from the solenoid 5 via the fixed core 6, and the movable core end face 7s approaches the yoke end face 6s. Since the movable core end surface 7s abuts on the protruding end 16a of the regulating member 16, a gap is formed between the movable core end surface 7s and the yoke end surface 6s. This gap is a value that matches the above-mentioned set amount T.

That is, since the movable core 7 and the fixed core 6 are formed of a magnetic material, for example, in a configuration in which the movable core end face 7s and the yoke end face 6s are in close contact with each other, after the solenoid 5 is switched from the energized state to the non-energized state. Even so, it is conceivable that the action of the residual magnetism, the action of the force for maintaining the close contact surface, and the like may cause the inconvenience that the movable core end face 7s and the yoke end face 6s continue to be in close contact with each other.

On the other hand, in the present embodiment, when the solenoid 5 is switched from the ON state to the OFF state, a gap is already formed between the yoke end face 6s and the movable core end face 7s by the restricting member 16. Even in a situation where residual magnetism acts, the movable core 7 is quickly moved to the position when it is not energized, and the responsiveness is improved.

Further, the end on the inner diameter side of the protruding end 16a is arranged on the side farther from the shaft core X than the end on the shaft core X side of the breathing hole 7a, and the end on the outer diameter side of the protruding end 16a is breathing. Since the hole 7a is arranged closer to the shaft core X than the end portion farther from the shaft core X, the internal space S between the movable core end face 7s and the yoke end face 6s is formed in the movable core 7. It can communicate with the breathing hole 7a. Alternatively, the internal space S can be communicated with the breathing oil passage between the operating rod 8 and the wall surface of the through hole H via the breathing hole 7a.
As a result, the hydraulic oil in the internal space S can be released by using the breathing hole 7a for releasing the hydraulic oil in the spring chamber in which the holding spring 10 is arranged. It is possible to reduce the negative pressure of the internal space S and improve the responsiveness with a simple configuration without processing the groove or the like of the space S.

[Action and effect of the embodiment]
From such a configuration, when the solenoid 5 is set to the ON state, the protruding end 16a of the regulating member 16 comes into contact with the movable core end surface 7s, so that a gap is provided between the movable core end surface 7s and the yoke end surface 6s. Is formed. Therefore, when the solenoid 5 is switched from the ON state to the OFF state, the movable core 7 is quickly moved to the non-energized position even in a situation where residual magnetism acts, and the responsiveness is improved. do.

Further, when the solenoid 5 is set to the ON state, the protruding end 16a of the regulating member 16 comes into contact with the region where the plurality of breathing holes 7a are formed in the movable core 7, so that the protruding end 16a of the regulating member 16 abuts. The inconvenience that the entire circumference is in close contact with the movable core end face 7s is prevented, and the responsiveness when the solenoid 5 is switched from the ON state to the OFF state is further improved.

[Another Embodiment]
The present invention may be configured as follows in addition to the above-described embodiments (those having the same functions as those of the embodiments are designated by the same numbers and reference numerals as those of the embodiments).

(A) As shown in FIG. 3, even if a plurality of convex portions 16c and concave portions 16d are alternately formed by cutting out the edge of the protruding end 16a of the regulating member 16 at set intervals along the circumferential direction. good. With this configuration, when the solenoid 5 is set to the ON state, the inconvenience that the entire circumference of the end edge of the protruding end 16a of the regulating member 16 is in close contact with the movable core end surface 7s is prevented, and the solenoid 5 is turned ON. The responsiveness when the state is switched from the state to the OFF state is realized.

(B) The regulating member 16 is formed in a cylindrical shape arranged on the axis X and the coaxial core as in the embodiment, and is in contact with the edge of the protruding end 16a of the regulating member 16 in the movable core end face 7s. By forming a large number of narrow grooves or a rough surface in the contacting region, a part of the entire circumference of the edge of the protruding end 16a of the regulating member 16 and the movable core end surface 7s are provided. A slight gap may be formed in the. As a result, the close contact when the solenoid 5 is switched from the ON state to the OFF state is eliminated, and the responsiveness is improved.

(C) An annular groove portion coaxial with the shaft core X is formed on the yoke end surface 6s, a cylindrical restricting member 16 is fitted into the groove portion, and the protruding end 16a is fixed in a state of protruding from the yoke end surface 6s. do. Even with such a configuration, a gap can be formed between the movable core end face 7s and the yoke end face 6s when the solenoid 5 reaches the ON state.

The present invention can be used for a control valve that operates a movable core by energizing a solenoid.

5 Solenoid 6 Fixed core 7 Movable core 7a Breathing hole 8 Acting rod 10 Holding spring (spring)
16 Regulator 16c Convex 16d Concave H Through hole S Internal space X Shaft core

Claims (4)

A cylindrical solenoid centered on the shaft core,
A fixed core, at least part of which is located in the internal space of the solenoid,
The fixed core is arranged in the internal space of the solenoid so as to face the axis direction of the solenoid and the fixed core side along the direction along the axis due to the magnetic force acting from the fixed core when the solenoid is energized. With a movable core that is sucked into
A regulating member made of a non-magnetic material that forms a gap between the movable core and the fixed core by contacting the movable core when the solenoid is energized is provided.
An actuating rod that operates integrally with the movable core is placed on a coaxial core with the shaft core through a through hole formed in the fixed core.
The restricting member has a tubular shape with the operating rod inserted therein, and is provided on the side of the fixed core facing the movable core.
The movable core has a plurality of breathing holes formed in a position parallel to the shaft core at a position overlapping the cylindrical restricting member in a directional view along the shaft core.
A solenoid valve in which the gap formed between the movable core and the fixed core and the breathing hole communicate with each other when the solenoid is energized. A breathing oil passage formed between the through hole formed in the fixed core and the working rod or inside the working rod is provided.
The solenoid valve according to claim 1, wherein the gap formed between the movable core and the fixed core, the breathing hole, and the breathing oil passage communicate with each other when the solenoid is energized. A spring chamber for accommodating a spring that urges the movable core in the axial direction is formed at a position opposite to the side on which the fixed core is arranged with respect to the movable core. Has been
The solenoid valve according to claim 1 or 2, wherein the breathing hole penetrates from the end surface on the fixed core side to the end surface on the spring chamber side in the movable core. A claim in which convex portions protruding in a direction along the axis and concave portions recessed in the direction along the axis are alternately formed on the edge of the restricting member on the movable core side along the circumferential direction. The solenoid valve according to any one of 1 to 3.

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