JP2008223921A - Solenoid valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solenoid valve capable of suppressing magnetic flux from flowing to an end turn part of a coil spring. <P>SOLUTION: The solenoid valve is equipped with a coil for forming a magnetic field when energized, a yoke composed of a magnetic material storing the coil, an armature that is a magnetic body disposed on the inner peripheral side of the yoke, a plunger that is a magnetic body disposed with a predetermined gap from the armature and attracted by the armature when the coil is energized, and the coil spring that is a magnetic body disposed between the armature and the plunger for urging the plunger in a valve closing direction. A recessed part for storing an end of the coil spring is formed at an abutting part of the plunger and the coil spring of the armature, and the depth of the recessed part is made deeper than the end turn part of the coil spring. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electromagnetic valve used for a brake device or the like.

As this type of technology, the technology described in Patent Document 1 is disclosed. In this publication, a spring is provided between the stopper and the plunger to urge the plunger in the valve closing direction. In addition, a gap is provided between the stopper and the plunger to allow the plunger to move in the direction to open when the coil is energized.
JP 2001-65728 A

  In order to improve the sitting of the coil spring, an end portion of the spring (coil spring) is provided with a winding end wound with a winding wound more densely than other portions of the coil spring. In the above prior art, the magnetic flux flows to the end winding portion when energized, and there is a possibility that the attractive force for attracting the plunger in the valve opening direction may be reduced.

  The present invention has been made paying attention to the above problems, and an object of the present invention is to provide an electromagnetic valve capable of suppressing the flow of magnetic flux to the end winding portion of the coil spring.

  To achieve the above object, a coil that forms a magnetic field when energized, a yoke made of a magnetic material that houses the coil, an armature that is a magnetic body disposed on the inner peripheral side of the yoke, and a predetermined amount for the armature A plunger that is a magnetic body that is disposed with a gap between and is attracted to the armature when the coil is energized, and a magnetic body that is disposed between the armature and the plunger and biases the plunger in the valve closing direction. A coil spring, and a recess for accommodating an end of the coil spring is formed in a contact portion of the coil spring of the plunger and the armature, and the depth of the recess is set to the depth of the coil spring. It was deeper than the cigarette.

  Therefore, in the electromagnetic valve of the present invention, it is possible to suppress the flow of magnetic flux lines through the end winding portion of the coil spring. Therefore, the flow of the magnetic flux line in the axial direction between the armature and the plunger increases, and the attractive force of the plunger can be increased.

  The best mode for realizing the solenoid valve of the present invention will be described below in Embodiment 1.

[Configuration of solenoid valve]
FIG. 1 is a sectional view of a solenoid valve 1 that is a normally closed solenoid valve, and FIG. 2 is an enlarged sectional view of an armature 4 and a plunger 5 of the solenoid valve 1.
The electromagnetic valve 1 includes a coil 2 that generates an electromagnetic force when energized, an armature 4 disposed inside a yoke 3 that houses the coil 2, a plunger 5 that is driven by the electromagnetic force, and a seat valve 6 that is formed in a hollow shape. The valve body 7 accommodates the seat valve 6 inside, and the ball 8 provided between the plunger 5 and the seat valve 6.

An electromagnetic valve insertion portion 11 into which the electromagnetic valve 1 is inserted is formed in the middle of the oil passage 10 formed in the housing 9. A seal member 12, a guide member 13, a seat valve 6, and a valve body 7 are sequentially inserted into the electromagnetic valve insertion portion 11, and the valve body 7 is caulked and fixed by a housing 9.
An oil passage 6a is formed in the seat valve 6, and the oil passage 6a communicates with a seat hole 6c formed in the seat surface 6b.

  A cylindrical member 14 is fixed to the valve body 7. The armature 4 and the plunger 5 are inserted into the cylindrical member 13. The armature 4 is fixed to the cylindrical member 13, and the plunger 5 is accommodated so as to be movable in the axial direction. Further, a gap 16 is disposed between the armature 4 and the plunger 5 when the coil 2 is not energized. A coil spring 15 is provided between the armature 4 and the plunger 5. The coil spring 15 biases the plunger 5 toward the seat valve 6 and closes the seat hole 6 c with the ball 8.

  Most of the coil spring 15 is accommodated in a concave coil spring accommodating portion 5 a formed on the plunger 5. Further, the armature 4 side of the coil spring 15 is supported by a concave coil spring support portion 4 a formed on the armature 4. FIG. 2 is a partial enlarged cross-sectional view of the vicinity of the armature 4 of the electromagnetic valve 1. The depth of the coil spring support portion 4 a formed on the armature 4 and the coil spring accommodating portion 5 a formed on the plunger 5 are formed deeper than the end winding portion 15 a of the coil spring 15.

[Operation of solenoid valve]
FIG. 3 is a diagram showing magnetic flux lines flowing through the electromagnetic valve 1 when the valve is opened, and FIG. 4 is a diagram showing magnetic flux lines flowing through the electromagnetic valve 1 when the valve is closed. 3 and 4, the electromagnetic valve 1 is a cross-sectional view, but is not hatched for easy understanding of the flow of magnetic flux lines.
When the coil 2 is not energized, the coil spring 15 biases the plunger 5 toward the seat valve 6 and closes the seat hole 6 c by the ball 8. As a result, the oil passage 10 is blocked.

  When the coil 2 is energized, an attractive force is generated in the direction of the magnetic flux lines by the magnetic force generated in the coil 2. That is, the plunger 5 is attracted to the armature 4 side by the magnetic force generated in the coil 2. When this suction force is smaller than the urging force of the coil spring 15, the seat hole 6 c is closed by the ball 8. On the other hand, when the suction force is larger than the urging force of the coil spring 15, the plunger 5 moves to the armature 4 side by the suction force, and the ball 8 opens the seat hole 6c.

[Reduced plunger suction]
FIGS. 5 and 6 are diagrams showing magnetic flux lines flowing through the armature 4 and the plunger 5 when the coil spring support 4a is not provided in the armature 4, FIG. 5 is when the solenoid valve 1 is opened, and FIG. The valve 1 is closed. 5 and 6, the electromagnetic valve 1 is a cross-sectional view, but is not hatched for easy understanding of the flow of magnetic flux lines.
The attractive force is generated in the direction of the magnetic flux lines. Therefore, in order to generate an attractive force on the armature 4 side with respect to the plunger 5, it is preferable that a magnetic flux line flows in the axial direction between the armature 4 and the plunger 5.

  Since the end winding part 15a of the coil spring 15 is wound more densely than the general part which is a part other than the end winding part 15a of the coil spring 15, the magnetic flux lines easily flow, as shown in FIGS. Magnetic flux lines flow through the end turn 15a of the coil spring 15 that contacts the armature 4. Since the magnetic flux lines that have flowed through the end turn portion 15a flow in the radial direction between the end turn portion 15a and the plunger 5, no suction force to the armature 4 side is generated with respect to the plunger 5, so the suction force of the plunger 5 May become smaller.

  Therefore, in Example 1, the coil spring support portion 4a deeper than the end winding portion 15a of the coil spring 15 is formed at the contact portion of the coil spring 15 of the armature 4. With this configuration, the general part faces the gap 16 when the solenoid valve 1 is open.

[Operation of coil spring support]
7 and 8 are diagrams showing magnetic flux lines flowing through the armature 4 and the plunger 5 when the armature 4 is provided with the coil spring support portion 4a. FIG. 7 is a diagram when the solenoid valve 1 is opened, and FIG. 1 shows when the valve is closed. 7 and 8, the electromagnetic valve 1 is a cross-sectional view, but is not hatched for easy understanding of the flow of magnetic flux lines.

  As shown in FIGS. 7 and 8, since the magnetic flux lines are concentrated on the surface 4 b facing the plunger 5 of the armature 4, the flow of magnetic flux lines to the end winding portion 15 a of the coil spring 15 can be suppressed. Therefore, the flow of magnetic flux lines in the axial direction increases, and the attractive force of the plunger 5 can be increased.

[Effect of Example 1]
The effect of Example 1 is demonstrated.
(1) A coil 2 that forms a magnetic field when energized, a yoke 3 made of a magnetic material that houses the coil 2, an armature 4 that is a magnetic body disposed on the inner peripheral side of the yoke 3, and a predetermined amount with respect to the armature 4 A plunger 5 which is a magnetic body which is disposed with a gap 16 and is attracted to the armature 4 when the coil 2 is energized, and a magnet which is disposed between the armature 4 and the plunger 5 and biases the plunger 5 in the valve closing direction. In the electromagnetic valve 1 including the coil spring 15 of the body, the coil spring support portion 4a in which the end portion of the coil spring 15 is accommodated in the contact portion of the coil spring 15 of the plunger 5 and the armature 4; The coil spring support portion 4a and the coil spring accommodating portion 5a are made to have a depth corresponding to the end portion of the coil spring 15. It was deeper than 5a.

  Therefore, it is possible to suppress the flow of magnetic flux lines to the end turn portion 15a of the coil spring 15. Therefore, the flow of magnetic flux lines in the axial direction between the armature 4 and the plunger 5 increases, and the attractive force of the plunger 5 can be increased.

  (2) A coil 2 that forms a magnetic field when energized, a magnetic material-made yoke 3 that houses the coil 2, a magnetic armature 4 disposed on the inner peripheral side of the yoke 3, and a predetermined gap with respect to the armature 4 16 is opened and arranged between the armature 4 and the plunger 5 of the magnetic body that is attracted to the armature 4 when the coil 2 is energized, and the magnetic body that biases the plunger 5 in the valve closing direction. In the electromagnetic valve 1 including the coil spring 15, only the general portion excluding the end winding portion 15 a of the coil spring 15 faces the gap 16.

  Therefore, it is possible to suppress the flow of magnetic flux lines to the end turn portion 15a of the coil spring 15. Therefore, the flow of magnetic flux lines in the axial direction between the armature 4 and the plunger 5 increases, and the attractive force of the plunger 5 can be increased.

[Other embodiments]
Although the best mode for carrying out the present invention has been described based on the first embodiment, the specific configuration of each invention is not limited to each embodiment and does not depart from the gist of the invention. Any changes in the design of the range are included in the present invention.

Further, technical ideas other than the claims that can be grasped from the above embodiments will be described below together with the effects thereof.
(A) In the solenoid valve according to claim 1 or 2,
2. The electromagnetic valve according to claim 1, wherein the end turn part is two or three turns from an end of the coil spring.

  Since the coil winding end winding portion, which is wound more densely than the general portion of the coil spring and the flow of the magnetic flux line, has a small number of turns of 2 or 3, the amount of magnetic flux lines flowing through the coil spring end winding portion is suppressed. It becomes possible. Therefore, the flow of the magnetic flux line in the axial direction between the armature and the plunger is increased, and the attractive force of the plunger can be increased.

It is sectional drawing of the solenoid valve which is a normally closed solenoid valve of Example 1. FIG. It is an expanded sectional view of the armature and the plunger part of the solenoid valve of Example 1. It is a figure which shows the magnetic flux line which flows into the solenoid valve of Example 1 (when valve opening). It is a figure which shows the magnetic flux line which flows into the solenoid valve of Example 1 (at the time of valve closing). It is a figure which shows the magnetic flux line which flows into an electromagnetic valve, when the coil spring support part is not provided in the armature of Example 1. It is a figure which shows the magnetic flux line which flows into an electromagnetic valve when the coil spring support part is not provided in the armature of Example 1 (at the time of valve closing). It is a figure which shows the magnetic flux line which flows into a solenoid valve, when a coil spring support part is provided in the armature of Example 1. It is a figure which shows the magnetic flux line which flows into an electromagnetic valve, when a coil spring support part is provided in the armature of Example 1 (when a valve is closed).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Solenoid valve 2 Coil 3 Yoke 4 Armature 4a Coil spring support part 5 Plunger 5a Coil spring accommodating part 16 Gap

Claims (2)

A coil that forms a magnetic field when energized;
A yoke made of a magnetic material for housing the coil;
An armature that is a magnetic body disposed on the inner peripheral side of the yoke;
A plunger that is a magnetic material that is arranged with a predetermined gap with respect to the armature and is attracted to the armature when the coil is energized;
A coil spring disposed between the armature and the plunger and being a magnetic body that urges the plunger in a valve closing direction;
In a solenoid valve with
A solenoid valve characterized in that a concave portion in which an end portion of a coil spring is accommodated is formed in a contact portion of the coil spring of the plunger and the armature, and the depth of the concave portion is made deeper than the end winding portion of the coil spring. . A coil that forms a magnetic field when energized;
A magnetic-material yoke that houses the coil;
A magnetic armature disposed on the inner peripheral side of the yoke;
A magnetic plunger that is arranged with a predetermined gap with respect to the armature and is attracted to the armature when the coil is energized;
A magnetic coil spring disposed between the armature and the plunger and biasing the plunger in a valve closing direction;
In a solenoid valve with
Only the general part except the end winding part of the coil spring faces the gap.

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