JPH0614413Y2 - Electromagnetic solenoid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to an electromagnetic solenoid designed to reduce the operating noise of a plunger when a coil is energized.

(Prior Art) For example, FIG. 2 shows a conventional electromagnetic solenoid used for a lock mechanism of a shift lever or an ignition key of an automatic vehicle. That is, 1 is a yoke, 2 is a sleeve, 3 is a coil wound around a bobbin 3a, 4 is a plunger, 5 is a core, and 6 is a damper.

In this conventional example, when the coil 3 is energized, the electromagnetic force of the coil 4 causes the plunger 4 to move in the direction of arrow A, that is, the core 5.
It is sucked and moved in the direction, and the tip portion 4a thereof comes into contact with the damper 6 and stops. And plunger 4
A gap is secured between the damper 5 and the core 5 when the damper 6 strikes the damper 6. Thereby, the collision sound of the plunger 4 with respect to the damper 6 is absorbed by the damper 6, and the plunger 4 is prevented from directly colliding with the core 5, so that the operating noise of the plunger 4 is reduced. ing.

(Problems to be solved by the invention) However, in the above-described configuration, when the current flowing through the coil 3 increases, the electromagnetic force of the coil 3 also increases,
The moving speed of the plunger 4 is also high. Therefore, in such a case, since the plunger 4 collides with the damper 6 with a large impact force, the sound absorbing effect is insufficient and the collision noise becomes large, and sometimes the collision noise becomes large. The damper 6 may be compressed so much that the plunger 4 may directly abut against the core 5, which causes a problem that the operating noise of the plunger 4 becomes loud.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an electromagnetic solenoid capable of sufficiently reducing the operating noise of the plunger even when the current flowing through the coil increases.

[Structure of the Invention] (Means for Solving the Problems) In an electromagnetic solenoid of the present invention, a sleeve is provided in a yoke, a coil is arranged on the outer circumference of the sleeve, and a core positioned in the sleeve is provided in the yoke. A seal member is attached to the outer peripheral portion of the core so as to keep the core and the sleeve in an airtight state, and is moved in the sleeve toward the core when the coil is energized so that the tip peripheral edge portion is the seal. It is characterized in that a plunger that contacts the member is inserted.

(Operation) According to the electromagnetic solenoid of the present invention, when the coil wound around the sleeve in the yoke is energized, the plunger is attracted and moved in the sleeve toward the core attached to the yoke. Then, the air between the seal member that maintains the airtight state between the core and the sleeve and the tip of the plunger is compressed, and the compressed air urges the plunger in the direction opposite to the moving direction. As a result, the peripheral edge of the tip of the plunger comes into contact with the seal member while reducing the moving speed.

(Embodiment) An embodiment of the present invention will be described below with reference to FIG.

11 is a U-shaped magnetic yoke, 12 is a bobbin 1
The coil is wound around 2a, and 13 is a sleeve fitted and fixed in the hollow portion of the bobbin 12a. And the yoke 11
A bobbin 12a and a sleeve 13 are attached to the inside, and a magnetic support fitting 14 that supports the bobbin 12a and the sleeve 13 is attached to the right open end of the yoke 11. Reference numeral 15 denotes a core, which is fitted in the sleeve 13, one end portion 15a of which is fitted in the hole 11a of the yoke 11 and whose end portion is caulked.
The other end portion 15b has a tapered shape with a tip having a small diameter. Reference numeral 16 denotes a seal member which is also mounted on a groove portion 15c formed in the core 15 and also serves as a damper. The seal member 16 keeps the space between the core 15 and the sleeve 13 in an airtight state. Reference numeral 17 denotes a plunger made of a magnetic material, which is inserted into the sleeve 13, and has a tapered concave portion 1 corresponding to the other end portion 15b of the core 15 at its tip portion.
7a is formed. This plunger 17 has a core 15
When moved in the direction, the tip peripheral edge portion 17b (recessed portion 17a
(The outer peripheral edge portion of the recess) abuts on the seal member 16,
There is a slight gap between the core 15 and the other end 15b of the core 15.

Next, the operation of the above configuration will be described.

When the coil 12 is energized, magnetic flux is generated in the core 15 and the yoke 1.
1, the support metal fitting 14, the plunger 17, and the core 15 pass through the path. As a result, the plunger 17 is sucked and moves at a rapid speed in the arrow A direction, that is, the core 15 direction. Since the seal member 16 maintains the airtight state between the core 15 and the sleeve 13, the air between the tip of the plunger 17 and the core 15 is compressed,
This compressed air urges the plunger 17 in the direction opposite to the arrow A, and the tip end peripheral portion 17b of the plunger 17 contacts the seal member 16 while reducing the moving speed thereof. And
The compressed air is expelled through the gap between the plunger 17 and the sleeve 13.

According to the above embodiment, the following effects can be obtained. That is, coil 1
When the plunger 17 is attracted and moves toward the core 15 at a rapid speed during the energization of 2, the air between the tip portion of the plunger 17 and the core 15 is compressed, and the tip peripheral portion 17b is reduced while the moving speed of the plunger 17 is reduced. The seal member 16
The seal member 16 exerts a sufficient suction effect since it abuts against the concave portion 17a of the plunger 17.
Does not come into direct contact with the other end portion 15b of the core 15, so that the operating noise of the plunger 17 can be sufficiently reduced. In particular, the pressure of the air compressed by the movement of the plunger 17 increases as the moving speed of the plunger 17 increases, so the deceleration effect also increases, and unlike the conventional case, the current flowing through the coil 12 is large and the electromagnetic force is large. Even when it becomes large, the operating noise of the plunger 17 can be sufficiently reduced.

[Effects of the Invention] As is apparent from the above description, in the electromagnetic solenoid of the present invention, the seal member is fitted on the outer peripheral portion of the core so as to maintain the space between the sleeve and the sleeve in an airtight state, and the plunger is moved when the coil is energized. Since the distal end peripheral portion of the plunger is brought into contact with the seal member when moved in the core direction, it is possible to sufficiently reduce the operating noise of the plunger even when the current flowing through the coil increases. Play.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention.
The figure corresponds to FIG. 1 of the conventional example. In the figure, 11 is a yoke, 12 is a coil, 13 is a sleeve,
15 is a core, 16 is a sealing member, 17 is a plunger, 1
7b shows a peripheral portion of the tip.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kanichi Tanaka, No. 1 Noda, Toyoda, Oguchi-cho, Niwa-gun, Aichi Prefecture Tokai Rika Electric Works Co., Ltd. (56) Reference JP-A-49-109858 (JP, A) Actual KO 55-35779 (JP, Y2)

Claims (1)

[Scope of utility model registration request] 1. A yoke, a sleeve provided in the yoke, a coil arranged on the outer periphery of the sleeve, a core attached to the yoke and located in the sleeve, and an outer peripheral portion of the core. A seal member that is fitted and held between the sleeve and the airtight state; Electromagnetic solenoid equipped.