JPH0787143B2 - Rotary solenoid - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary solenoid used for a display of a vending machine, for switching the flow direction of coins, for switching the flow direction of balls on a pachinko machine, and the like.

(Prior Art) Conventionally, the rotary solenoid device disclosed in FIGS. 6 and 7 of Japanese Patent Publication No. 163607/1986 includes a magnetic steel bottom plate 2 made of mild steel.
The center portion of the is projected by pressing into a cylindrical shape (2a, 2b), and oilless bearings 15a, 15b are fitted therein, and the rotary shaft 15 is rotatably supported by these.
The E-ring 15c is the rotary shaft 15 and the rotor 3 fixed to the rotary shaft 15.
Moves upward to prevent the steel balls 8a and 8b from escaping. The bottom plate 2 is press-fitted inside the lower side of the stator 1.

A mild steel cylinder 4 is press-fitted and fixed in a circular groove on the back surface of the rotor 3, and an exciting coil 14 is mounted inside the cylinder 4 and the stator 1 as shown in the figure. , 2
b, cylinder 4, rotor 3 (including salient poles 3a and 3b), and stator 1
The magnetic path is closed via (including the magnetic poles 1a and 1b).

Therefore, the salient poles 3a, 3b are attracted to the magnetic poles 1a, 1b and rotated in the direction of arrow C against the back spring.

(Problems to be Solved by the Invention) By the way, in the above conventional technique, the rotor 3 and the stator 1
Are arranged in parallel in a plane with a small gap, and the magnetic field lines pass through the gap in parallel with the rotating shaft 15. Therefore, a large force acts on the rotor 3 in the axial direction to reduce the size. In the case of the above product, there was a problem that the rotational friction was significantly increased, and as a result of the experiment, it could not be put to practical use.

Also, when the rotor and the stator are arranged in parallel with a small gap (about 0.1 mm) in parallel, the suction force of the movable part is stronger than the rotation force unless the gap is maintained with high accuracy over a flat surface. There is a problem that the shaft presses the bearing and the pressure contact force becomes strong and it becomes impossible to rotate, and it is extremely difficult to machine the facing plane with high accuracy of about 0.1 mm, and the processing cost is extremely expensive. There was a problem.

(Means for Solving the Problems) The present invention is intended to solve the above problems, and a cylindrical center magnetic pole fitted and fixed to the center of the coil is fitted and fixed to the center hole of the bottom of the yoke. A bearing is fixed in the center pole center hole to rotatably support the rotating shaft, and a rotor having cylindrical pole teeth on the outer periphery is orthogonally fixed to the tip of the rotating shaft protruding from the upper end of the center pole, and projects perpendicularly to the outer periphery of the yoke. The inner surface of the upper end of the arc-shaped magnetic pole teeth provided and the outer circumference of the arc-shaped magnetic pole teeth of the rotor are opposed to each other with a predetermined gap.

Hereinafter, a specific description will be given based on the illustrated embodiment. A center pole 21 is fitted and fixed in the center of the coil 20, a bearing 22 is fitted and fixed in the center hole of the coil 20 to rotatably support a rotary shaft 23, and a rotor having magnetic pole teeth 24a at one end of the rotary shaft 23. twenty four
Is fixed, and an arcuate yoke 25 having magnetic pole teeth 25a is arranged on the outer periphery of the coil 20, and a center magnetic pole is provided at the center of the bottom of the yoke 25.
One end of 21 is fixed, and the yoke 25 and the center magnetic pole 21 form a closed magnetic path between the outer periphery of the rotor 24 and the inner peripheral surface of the upper portion of the arc-shaped yoke 25. 26 is a cover.

Next, the operation will be described. When the coil 20 is energized, a magnetic path is formed from the center magnetic pole 21 toward the rotor 24 and the inner peripheral surface of the upper portion of the yoke 25 in a direction perpendicular to the rotating shaft 23.
To form a closed magnetic circuit, and the rotor 24 rotates.

(Effect) In the present invention, the cylindrical center magnetic pole fitted and fixed in the center of the coil is fitted and fixed in the center hole of the bottom of the yoke, and the bearing is fixed in the center magnetic pole center hole so that the rotary shaft is rotatable. Pivot,
A rotor having arcuate magnetic pole teeth on the outer periphery is orthogonally fixed to the tip of the rotary shaft protruding from the upper end of the center magnetic pole, and the inner surface of the upper end of the arcuate magnetic pole teeth projecting perpendicularly to the outer circumference of the yoke and the outer periphery of the arcuate magnetic pole teeth of the rotor. Since they are opposed to each other with a predetermined gap, the magnetic field lines passing through the gap have a direction perpendicular to the rotation axis, the rotor receives a uniform radial force to the yoke, and a right angle to the axis is obtained. Even if it is not present, the attraction force in the axial direction of the magnetic pole of the movable part is very small, and it does not affect the rotational force.

Therefore, it is possible to generate a rotational force without being affected by the rotation at all, and since the gap portion is formed by the inner surface of the arc-shaped yoke and the outer surface of the arc-shaped rotor, it is possible to easily and accurately perform the gap processing by the rotation processing. Can be formed, and the processing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a cutaway front view of an essential part of an embodiment of the present invention, FIG. 2 is a plan view of the same, and FIG. 3 is a perspective view of a rotary shaft, a rotor and a yoke portion of FIG. 20 …… Coil, 21 …… Center pole 22 …… Bearing, 23 …… Rotating shaft 24 …… Rotor, 24a …… Pole tooth 25 …… Yoke, 25a …… Pole tooth

Front page continuation (72) Inventor Shunpei Kinoshita 5-13-13 Kamisuna-cho, Tachikawa-shi, Tokyo Act Giken Co., Ltd. (56) Reference JP-A-61-163607 (JP, A)

Claims (1)

[Claims] 1. A cylindrical center magnetic pole fitted and fixed in the center of a coil is fitted and fixed in a center hole in the bottom of a yoke, and a bearing is fixed in the center magnetic pole center hole to rotatably support a rotary shaft. , A rotor having arcuate magnetic pole teeth on the outer periphery is orthogonally fixed to the tip of the rotary shaft protruding from the upper end of the center magnetic pole, and the inner surface of the upper end of the arcuate magnetic pole teeth projecting perpendicularly to the outer periphery of the yoke, and the outer periphery of the arcuate magnetic pole teeth of the rotor. A rotary solenoid characterized in that the two are opposed to each other with a predetermined gap.