JP2002199688A - Solenoid actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the looseness of a movable core in a solenoid actuator operating a mechanism to be connected by a shaft connected to the movable core moved in the axial direction on the side of a fixed core against the urging force of a spring in solenoid excitation. SOLUTION: A lock mechanism is provided between the movable core and the part of a yoke body opposed to the movable core, and the movable core is restrained to the yoke body as long as the solenoid is excited.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid actuator.

[0002]

2. Description of the Related Art A conventional solenoid actuator, for example, one disclosed in Japanese Patent Application Laid-Open No. 2000-104554 includes the following components (1) to (7).

A solenoid formed by winding a wire around a bobbin made of a non-magnetic material A fixed core made of a magnetic material fixed to one side of the internal space of the solenoid and capable of moving relative to the fixed core in the axial direction. A movable core made of a magnetic material disposed on the other side of the internal space of the solenoid as described above. A spring stretched between the fixed core and the movable core. The spring is provided on the other side of the solenoid and functions as the spring. A positioning body that regulates the movement of the movable core to the side away from the fixed core is disposed so as to extend in the axial direction on the outer periphery of the bobbin, and the surface of the fixed core and the A yoke made of a magnetic material that is constantly in contact with the surface of the movable core; Since the solenoid actuator described above is mounted on a vehicle, the spring urging force is set sufficiently large (more than the product of the mass of the movable core and the shaft and the vibration acceleration) to secure the vibration resistance of the movable core and the shaft. When the solenoid is demagnetized, the movable core is pressed against the positioning body by the spring urging force.

[0004]

However, when the solenoid is excited, the movable core shifts to the fixed core side against the spring urging force. Therefore, if the spring urging force is large, the exciting force of the solenoid must be increased. However, the size of the solenoid is inevitably increased. Although an increase in the size of the solenoid inevitably leads to an increase in the size of the solenoid actuator, in view of the limited mounting space of the vehicle body, an unconditional increase in the size of the solenoid actuator is impossible.

Therefore, an object of the present invention is to provide a solenoid actuator capable of securing the vibration resistance of a movable core without increasing the urging force of a spring.

[0006]

Means for Solving the Problems The technical means taken to solve the above technical problems are as follows:
"A solenoid formed by winding a wire on a non-magnetic bobbin, a magnetic fixed core fixed to one side of an internal space extending in the axial direction of the solenoid, A movable core made of a magnetic material displaceably disposed on the other side of the internal space, a spring stretched between the fixed core and the movable core, and a spring extending in the axial direction of the bobbin. A solenoid actuator, comprising: a yoke made of a magnetic material disposed and magnetically coupled to the fixed core and the movable core; wherein the yoke and the movable yoke are moved in conjunction with excitation and non-excitation of the solenoid. A solenoid actuator having a lock mechanism for regulating the relative movement of the core is provided.

According to a second aspect of the present invention, the lock mechanism includes a pin disposed on one of the yoke and the movable core, and an elastic body for urging the pin against the other of the movable core and the yoke. It is preferable to have

According to a third aspect of the present invention, a recess in which the pin of the lock mechanism can protrude and retract is provided in one of the yoke and the movable core. The pin is made of a magnetic material, and is attracted to one of the yoke and the movable core by a magnetic flux generated by excitation of the solenoid or repelled from one of the yoke and the movable core. It is desirable.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

Referring to FIG. 1, a solenoid actuator 10 includes a solenoid 12. The solenoid 12 is formed by winding a wire 16 on a non-magnetic bobbin 14, as is well known.

A fixed core 18 made of a magnetic material is fixedly provided in the internal space of the solenoid 12, that is, on one side (lower side) of the axial hole of the bobbin 14. Thus, the upper half of the fixed core 18 is formed in a truncated cone shape having a conical surface 18a, and a boundary portion 18b between the conical surface 18a and the lower half of the fixed core 18 is an annular plane.

A movable core 20 made of a magnetic material is disposed on the other side (upper side) of the internal space of the solenoid 12 so as to be able to move relative to the fixed core 18 in the axial direction. A spring 24 is stretched between a boundary portion 18b of the fixed core 18 and an annular flat surface 20b of the movable core 20.
Thus, the movable core 20 is moved to the side separated from the fixed core 18 by the urging force of the spring 24, and this movement is regulated by the cup-shaped cover 30 provided on the other side (upper side) of the solenoid 12. Is done. That is, the cover 30 functions as a positioning body that restricts the movement of the movable core 20 to the side away from the fixed core 18. The inner space of the movable core 20 includes a blind bore portion 20c and a lower opening defined by a conical surface wall 20a. Are formed. As the magnetic material, iron is used in this specific example, but the magnetic material is not limited to this.

A yoke main body 42 made of a magnetic material is provided on the outer periphery of the bobbin 14 so as to extend in the axial direction. The upper end of the yoke main body 42 is caulked. Between the caulked portion and the upper end of the bobbin 14, the side yoke 44 placed on the upper end of the bobbin 14 and the flange 30a of the cover 30 are provided. And fix it. Similarly, the yoke body 4
The lower end of 2 is also caulked, and a side yoke 46 placed on the lower end of the bobbin 14 is clamped and fixed between the caulked portion and the lower end of the bobbin 14. Thus, the yoke main body 42, the side yokes 44, and the side yokes 46 constitute the yoke body 40. In addition, the movable core 2
0 is close to the inner circumferential surface of the side yoke 44, and the fixed core 18
Is tightly fitted.

The fixed core 18 is formed with a stepped inner hole 18c penetrating in the axial direction, and a bearing 50 is mounted in a large diameter portion of the inner hole 18c. Thus, the shaft 52 is inserted through the bearing 50 and the inner hole 18 c so as to be movable in the axial direction. The upper end of the shaft 52 is enlarged in diameter and fitted into the blind bore portion 20 c of the movable core 20.
Fixed. Thus, the shaft 52 is
It is moved integrally with 0.

Between a part of the inner surface of the side yoke 44 and the outer surface of the movable core 20, a lock mechanism 6 described later in detail is provided.
0 is provided. The lock mechanism 60 is in a locked state while the solenoid 12 is demagnetized, restricts the movable core 20 to the side yoke 44, and allows the movable core 20 to move between the movable core 20 and the side yoke 44 regardless of the vibration of the vehicle. The relative position does not change. Thereby, even if the spring force of the spring 24 is reduced, the vibration resistance of the movable core 20 is ensured. Then, when the solenoid 12 is excited, the lock mechanism 60 is unlocked, and the restraint of the movable core 20 by the side yoke 44 is released. Thus, when the solenoid 12 is excited, the movable core is moved around the coil 16 by an electromagnetic force generated by a magnetic circuit constituted by the fixed core 18, the side yoke 46, the yoke main body 42, the side yoke 44 and the movable core 20. 20 faces the fixed core 18,
It moves against the urging force of the spring 24. As a result, the shaft 52 integral with the movable core 20 moves axially downward, and a device (not shown) operatively connected to the free end of the shaft 52 is activated. As this device, for example, there is an intake control valve described in JP-A-2000-104554.

The lock mechanism 60 will be described with reference to FIG.

A recess 44 a is formed in a part of the inner surface of the side yoke 44 so as to face the outer surface of the movable core 20. A hemispherical leaf spring 64 made of a non-magnetic material is non-rotatably fitted in the concave portion 44a, and a top portion thereof is formed on the outer surface of the movable core 20 so as to face the concave portion 44a. It protrudes in the 20d direction. A pin 62 made of a magnetic material is fixed to the top of the hemispherical leaf spring 64 by, for example, an adhesive or welding. In the illustrated state, that is, when the solenoid 12 is in the demagnetized state, the pin 62 rushes into and engages with the concave portion 20d formed on the outer surface of the movable core 20 by the urging force of the leaf spring 64 having the shape as illustrated. ing. In such a state (the locked state of the lock mechanism 60), the movable core 20 is
The movable core 20 cannot move radially and axially with respect to the side yoke 44. That is,
The insertion of the pin 62 into the concave portion 20d formed on the outer surface of the movable core 20 disables the movable core 20 from moving in the axial direction.

When the solenoid 12 is excited, the electromagnetic force generated by the magnetic circuit formed by the fixed core 18, the side yoke 46, the yoke 42, the side yoke 44, and the movable core 20 surrounds the coil 16. The pin 62 is attracted to the bottom surface of the concave portion 44a of the side yoke 44 which becomes one pole of the electromagnet against the urging force of the leaf spring 64. As a result, the pin 62 integrated with the leaf spring 64 is moved to the concave portion 20 d formed on the outer surface of the movable core 20.
The pin 62 comes out of the recess 44 of the side yoke 44.
It is almost completely stored inside the a. Thus, the movable core 2
0 is released from the pin 62 from the side yoke 44, and the movable core 20 can move in the axial direction with respect to the side yoke 44. And the movable core 20
It moves toward the fixed core 18 against the urging force of the spring 24. As a result, the shaft 52 integral with the movable core 20
Makes a downward axial movement, activating a device operatively connected to the free end of the shaft 52.

In the above configuration, the spring 24 that separates the movable core 20 from the fixed core 18 by a predetermined distance along the axial direction does not need to restrain the movable core 20 when the coil 16 is not energized. In order to prevent the movable core 20 from moving due to external force such as the above, it is not necessary to set the load high. Therefore, it is not necessary to increase the rating of the solenoid 12 for generating the magnetic force required to move the movable core 20 toward the fixed core 18 against the urging force of the spring 24. Thus, solenoid 1
2 can be prevented, and the actuator 10 can be prevented from increasing in size.

Further, the lock mechanism 60 can be easily constituted by the leaf spring 64 and the pin 62, and has a great effect in practical use.

Although the embodiments of the present invention have been described above, the present invention is not intended to be limited to the above-described embodiments.
Any configuration may be used as long as the configuration conforms to the gist of the present invention. For example, the following configuration can be adopted.

The number of pins 62 is increased.

Instead of the above-described configuration in which the pin 62 is attracted by the excitation of the solenoid 12 to release the engagement of the pin 62, a configuration in which the pin 62 is repelled by the excitation and the engagement of the pin 62 is released is provided. To do.

Instead of the above-described configuration in which the pin 62 is fitted into the concave portion 20a of the movable core 20 by being urged by a spring 64 provided in the concave portion 44a of the side yoke 44, the concave portion 20a The pin 64 may be fitted into the concave portion 44 a of the side yoke 44 by providing a spring 64 to the pin 64 and urging the pin 62 with the spring 64.

[0025]

As described above, in the present invention,
The spring that separates the movable core from the fixed core by a predetermined distance along the axial direction does not need to restrain the movable core, so the load is small, and the movable core is fixed against the urging force of the spring. It is not necessary to increase the rating of the solenoid for generating the magnetic force required to move the solenoid toward the core. Thus, the size of the solenoid and the size of the actuator accompanying the size of the solenoid can be prevented.

Further, the lock mechanism for controlling the movable core can be very simply constituted by a leaf spring and a pin which perform a snap action, and thus has a great effect in practical use.

[Brief description of the drawings]

FIG. 1 is a sectional view of a solenoid actuator according to the present invention.

FIG. 2 is an enlarged view of a portion A in FIG.

[Explanation of symbols]

 10: Solenoid actuator 18: Fixed core 20: Movable core 24: Spring 30: Cover (positioning body) 40: Yoke body 52: Shaft 60: Lock mechanism 62: Pin 64: Leaf spring

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Claims (4)

[Claims] 1. A solenoid formed by winding a wire on a bobbin made of a non-magnetic material, a fixed core made of a magnetic material fixed to one side of an internal space extending in the axial direction of the solenoid,
A movable core made of a magnetic material disposed on the other side of the internal space so as to be relatively displaceable with respect to the fixed core; a spring stretched between the fixed core and the movable core; A solenoid actuator, which is provided to extend in the axial direction and includes a yoke made of a magnetic material magnetically coupled to the fixed core and the movable core, wherein the solenoid actuator is linked to excitation and non-excitation of the solenoid. And a lock mechanism for restricting relative movement between the yoke and the movable core. 2. The device according to claim 1, wherein the lock mechanism includes a pin disposed on one of the yoke and the movable core, and an elastic body for urging the pin against the other of the movable core and the yoke. The solenoid actuator according to claim 1. 3. The solenoid actuator according to claim 2, wherein a recess in which the pin of the lock mechanism can protrude and retract is provided in one of the yoke and the movable core. 4. The pin is made of a magnetic material, and is attracted to one of the yoke and the movable core by a magnetic flux generated by excitation of the solenoid, or repelled from one of the yoke and the movable core. The solenoid actuator according to claim 2, wherein