JPH0138894Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an electromagnetic solenoid used for electrical-mechanical conversion in audio equipment and the like.

Conventional configurations and their problems In recent years, record players, video tape recorders, cassette tape recorders, etc.
Motors and electromagnetic solenoids are commonly used as means for converting electrical signals into mechanical systems because they are easy and inexpensive.

The configuration of the conventional electromagnetic solenoid will be described below.

Figure 1 shows a cross section of a conventional electromagnetic solenoid, where 1 is an iron core, 2 is a coil, 3 is a yoke, and 4 is a sectional view of a conventional electromagnetic solenoid.
5 is a spring for returning the iron core 1; 6 is a connecting piece connected to a driven object (not shown) driven by an electromagnetic solenoid; and 7 is a fixed object that stops the movement of the iron core 1. It is.

At the moment when current flows through coil 2, iron core 1 moves to arrow A.
, and the connecting piece 6 is also pulled in the direction of arrow B at the same time. Electrical-mechanical conversion is performed in this manner, but since both the iron core 1 and the iron core receiver 4 are made of iron-based metal, an impact noise is generated at the time of a collision. In addition, vibrations are also generated, and this impact noise and vibrations become harmful and degrade the quality of the equipment.

Purpose of the invention The purpose of the invention is to provide an electromagnetic solenoid that can almost completely eliminate harmful impact noise and vibration.

Structure of the invention The invention is an electromagnetic solenoid in which a pipe is loosely fitted to the outside of a movable iron core through a viscous material such as silicone oil.The viscous material reduces the moving speed of the iron core and reduces impact noise and vibration. It can be removed.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention is shown in FIG. 2, in which parts having the same functions as those in FIG. 1 are given the same symbols and explanations are omitted.

The feature of this embodiment is that the pipe 9 is loosely fitted into the iron core 1.
It is in. A reservoir groove 8 for a viscous substance such as silicone oil is provided in a part of the iron core 1, and an appropriate clearance is provided between the iron core 1 and the pipe 9, and a viscous substance such as silicone oil is applied between them. Also, the spring 10 constantly presses the pipe 9 downward, but its spring force is set to be weaker than the spring force of the spring 5.

When current flows through the coil 2, the iron core 1 is strongly attracted in the direction of arrow A. However, the suction force is damped by the viscous resistance of a viscous material such as silicone oil between the pipe 9 and the pipe 9. The higher the suction speed of the iron core 1, the greater the viscous resistance, and the slower the suction speed of the iron core 1. As a result, the core receiver 4
This reduces impact noise and vibration, making impact noise and vibration extremely small.

Next, when the current is interrupted, the iron core 1 quickly moves in the opposite direction of arrow A by the spring 5. At that time, the pipe 9 also moves in the same direction while compressing the spring 10.
When the iron core 1 reaches the point where it hits the fixed object 7 and stops, the pipe 9 is pushed by the spring 10 and slowly moves until it hits the yoke 3.

Effects of the invention The present invention loosely fits a pipe into a movable iron core, injects a viscous substance such as silicone oil between the iron core and the pipe, and presses the pipe toward the coil with a spring, thereby attaching the pipe to the coil. At the moment when electricity is applied, the iron core is gently attracted by the viscous resistance of the viscous body, preventing the generation of impact noise and vibration noise, and when the current is cut off, the iron core can be quickly returned to the specified position. It is possible to realize an electromagnetic solenoid.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional electromagnetic solenoid, and FIG. 2 is a sectional view of an embodiment of the electromagnetic solenoid of the present invention. DESCRIPTION OF SYMBOLS 1...Movable iron core, 2...Coil, 3...Yoke, 4...Iron core holder, 5...Spring that returns the iron core 1 to its original position when cut off, 6...Connection piece with driven object, 7... ...A fixed object that stops the movement of the iron core, 8...A reservoir groove provided in the iron core 1 for injecting a viscous substance, 9...A pipe, 10...A spring that lowers the pipe to its base.

Claims (1)

[Scope of utility model registration request] A movable pipe is attached to the outside of the iron core that is attracted to the center of the coil, a viscous substance such as silicone oil is applied between the iron core and the pipe, and the pipe is constantly pressed against the coil side by a spring. An electromagnetic solenoid configured as follows.