JP2013045855A - Solenoid device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solenoid device capable of preventing excessive adhesion by repeated abutting between a fixed iron core and a movable iron core and also preventing magnetization to the fixed iron core.SOLUTION: A coil 13 wound around a coil bobbin 12 is arranged in a yoke 11, a fixed iron core 14 is fixed to a bottom part of the yoke 11, a movable iron core 15 passes through the yoke 11 and is movably arranged in the coil bobbin 12 in the axial direction, the movable iron core 15 and the fixed iron core 14 are coaxially opposed to each other, the movable iron core 15 absorbs the fixed iron core 14 by energizing the coil 13, and the movable iron core 15 is returned to a standby position by a returning spring 16 when energization to the coil 13 is cut off. A thin plate-like washer 17 made of an elastic synthetic resin is mounted on the abutting surface between the movable iron core 15 and the fixed iron core 14.

Description

  The present invention relates to a solenoid device in which a movable iron core is attracted to a fixed iron core by exciting a coil.

Conventionally, as a solenoid device, a coil wound around a coil bobbin is disposed in a yoke, a fixed iron core is fixed to the bottom of the yoke, and a movable iron core is disposed in the coil bobbin so as to be movable in the axial direction through the yoke. The one that the movable iron core and the fixed iron core are coaxially facing each other, energize the coil to attract the movable iron core to the fixed iron core, and return the movable iron core to the standby position by the return spring when the coil is de-energized. ing.
In such a solenoid device, when the movable iron core is attracted and repeatedly brought into contact with the fixed iron core, a phenomenon occurs in which the mutual contact surfaces are worn and adhesion is increased. As a result, the mutual attracting force of the abutting surfaces is increased, the abutting surfaces of the fixed iron core are magnetized, and the adsorbing between the stationary iron core and the movable iron core is not released when the power supply to the coil is cut off. The phenomenon that it becomes impossible to return to the state occurs.
On the other hand, Patent Document 1 discloses a structure in which a moving iron core is provided with a noise-reducing rubber ring. When the movable iron core is attracted to the fixed iron core, the rubber ring is interposed between the flange portion of the movable iron core and the yoke to form an air gap between the movable iron core and the fixed iron core.
However, there is a dimensional tolerance in the diameter of the rubber ring, and the degree of compression of the rubber ring varies depending on the manufacturing error and assembly error of the component parts, so it is formed between the fixed iron core and the movable iron core. The air gap and the resulting magnetoresistance will also vary. Therefore, it is inevitable that an error occurs in the return timing of the movable core.

JP 2003-197425 A

  Accordingly, an object of the present invention is to provide a solenoid device that can effectively prevent excessive adhesion due to repeated contact between the fixed iron core and the movable iron core and magnetization of the fixed iron core. .

Hereinafter, the present invention will be described with reference to the accompanying drawings, but the present invention is not limited thereto.
In order to solve the above-described problems, the solenoid device according to the present invention has a solenoid device in which a coil 13 wound around a coil bobbin 12 is disposed in a yoke 11, a fixed iron core 14 is fixed to the bottom of the yoke 11, and passes through the yoke 11. The movable iron core 15 is disposed in the coil bobbin 12 so as to be movable in the axial direction. The movable iron core 15 and the fixed iron core 14 are coaxially opposed to each other, and the coil 13 is energized to attract the movable iron core 15 to the fixed iron core 14. When the power supply to the coil 13 is cut off, the movable iron core 15 is returned to the standby position by the return spring 16. A thin plate washer 17 made of an elastic synthetic resin is attached to the contact surface 15 c of the movable core 15 with the fixed core 14.

  According to the apparatus of the invention relating to this application, it is possible to effectively prevent excessive adhesion due to repeated contact between the fixed iron core and the movable iron core and magnetization of the fixed iron core.

It is a longitudinal cross-sectional view of the solenoid apparatus which concerns on one Example of this invention, and has shown the state which has a movable iron core in a standby position. It is a longitudinal cross-sectional view of the solenoid apparatus of FIG. 1, and has shown the state by which the movable iron core was attracted | sucked by the fixed iron core.

Embodiments of the present invention will be described with reference to the drawings.
A coil 13 wound around a coil bobbin 12 is disposed in the yoke 11, and a fixed iron core 14 is fixed to the bottom 11 d of the yoke 11.

  The yoke 11 includes a main body portion 11a having a substantially U-shaped cross section formed by bending a strip-shaped steel plate, and a lid portion 11b that connects between the open ends of the main body portion 11a. The main body 11 a of the yoke 11 is fixed to the base plate 25. A through hole 11c is formed in the center of the lid portion 11b. A through hole 11e is formed in the center of the bottom 11d of the main body 11a so as to face the through hole 11c of the lid 1b.

  The fixed iron core 14 is positioned inside the coil bobbin 12 and is fixed to the bottom 11 d of the yoke 11. The fixed iron core 14 has a frustoconical recess 14a concentric with the coil bobbin 12, and has a through hole 14c concentric with the through hole 11e of the yoke 11 at the center of the bottom surface 14b of the recess 14a.

  One end side of the movable iron core 15 is inserted into the coil bobbin 12 so as to be movable in the axial direction, and the other end side penetrates the through hole 11c of the lid portion 11b and protrudes outward. A protrusion 15a is provided at the protruding end, and a return spring 16 is interposed between the flange 15a and the lid 11b of the yoke. The movable iron core 15 is urged toward the other end side in the axial direction by the return spring 16. The movable iron core 15 has a frustoconical convex portion 15b fitted into the concave portion 14a of the fixed iron core 14 on one end side. The end surface of the convex portion 15 b is a contact surface 15 c that faces the bottom surface 14 b of the fixed iron core 14.

  A thin plate washer 17 made of an elastic synthetic resin is attached to the contact surface 15c. The washer 17 is interposed between the movable iron core 15 and the fixed iron core 14 to prevent direct collision between them. As the washer 17, for example, a nylon washer having a thickness of 0.13 to 0.50 and a polyslider (registered trademark) washer manufactured by Asahi Polyslider Co., Ltd. are suitable.

  A plunger 19 for interlocking with an external mechanism is connected to one end side of the movable iron core 15 by a coaxial pin 18. The coaxial pin 18 freely passes through the through hole 14 c of the fixed iron core 14 and the through hole 11 e of the yoke main body 11 a, and the plunger 19 freely passes through the through hole 20 b of the standing part 20 a of the base plate 20.

When the coil 13 is energized, the movable iron core 15 is attracted to the fixed iron core 14 and moves in the yoke 1 and the coil bobbin 12 in the axial direction while compressing the return spring 16. At this time, the washer 17 prevents a direct collision between the movable iron core 15 and the fixed iron core 14.
Thereby, mutual deformation and wear that increase the degree of mutual contact between the bottom surface 14b of the fixed iron core 14 and the contact surface 15c of the movable iron core 15 are avoided.

  When the energizing circuit of the coil 13 is turned off to interrupt the exciting current, the movable iron core 15 returns to the standby position by the urging of the return spring 16. Without the washer 17, the bottom surface 14b of the fixed iron core 14 and the contact surface 15c of the movable iron core 15 are deformed or worn to increase the degree of mutual adhesion, or the movable iron core 15 is magnetized. The phenomenon that the movable iron core 15 cannot be restored even when the power is turned off occurs. However, this phenomenon is avoided by the washer 17 in the solenoid device of this embodiment. The movable iron core 15 can be accurately returned at the original return timing, and a solenoid device that operates stably and reliably over a long period of time can be obtained.

11 Yoke 11a Yoke main body portion 11b Yoke lid portion 11c Through hole 11d Bottom portion 11e Through hole 12 Coil bobbin 13 Coil 14 Fixed iron core 14a Recess 14b Bottom surface 14c Through hole 15 Movable iron core 15a Groove 15b Protrusion 15c Contact surface 16 Return spring 17 Washer 18 Coaxial pin 19 Plunger 20 Fixed base 20a Standing portion 20b Through hole

Claims (1)

A coil 13 wound around a coil bobbin 12 is disposed in the yoke 11, a fixed iron core 14 is fixed to the bottom of the yoke 11, and the movable iron core 15 is disposed in the coil bobbin 12 so as to be movable in the axial direction through the yoke 11. The movable iron core 15 and the fixed iron core 14 are concentrically opposed to each other, and the coil 13 is energized to attract the movable iron core 15 to the fixed iron core 14. In the solenoid device that returns the valve to the standby position,
A solenoid device characterized in that a thin plate washer 17 made of an elastic synthetic resin is attached to a contact surface 15c of the movable iron core 15 with the fixed iron core 14.

Images