JPH066485Y2 - Low noise solenoid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a low-noise solenoid that produces a small impact during operation and produces little noise.

(Prior Art) Conventionally, a solenoid converts an electrical signal into a mechanical signal and is used in various fields because of its good operability. The solenoid is configured by arranging a winding around the movable core, and when a current is passed through the winding, the movable core is moved by a magnetic field generated inside.

Further, a limiter for restricting the further movement of the movable iron core when the movable iron core moves by a predetermined amount is provided, and the limiter collides with the restriction member at a predetermined position. In order to suppress the sound generated at the time of this collision, a shock absorbing member is provided.

FIG. 3 is a side view of a conventional low noise solenoid.

In the figure, 1 is a base for mounting a solenoid,
A coil 2 is arranged inside and is supported by a plate 3. The coil 2 has a movable iron core 4 arranged therein, and is moved in the axial direction by a magnetic field generated from a current flowing through the coil 2.

Although the amount of movement of the movable iron core 4 is determined by the electric current, a limiter 5 is provided in order to regulate the movement above a predetermined level. Movement is restricted by the limiter 5 colliding with the plate 3 which constitutes the restriction member.

Further, a shock absorber limiter rubber 6 is disposed between the limiter 5 and the plate 3 in order to suppress the noise generated at the time of the collision. Therefore, when a current flows from a power source (not shown) to the coil 2, the movable core 4 moves in the A direction,
When the limiter 5 hits the limiter rubber 6, it stops and the operation is completed.

(Problems to be solved by the invention) However, in the low noise solenoid having the above configuration, when the movable iron core 4 is moved by operating the solenoid,
The amount of movement of the movable iron core 4 with respect to the current flowing through the coil 2 depends on the bending of the limiter rubber 6 and changes due to impact.

Therefore, in order to secure the positional accuracy during suction, it is necessary to increase the hardness of the impact absorbing limiter rubber 6. However, on the other hand, the impact at the time of suction increases, and the noise increases accordingly.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the problems of the conventional low noise solenoid, and to provide a low noise solenoid that can reduce the impact generated during suction and the generated noise.

(Means for Solving the Problem) Therefore, in the low noise solenoid of the present invention, a movable iron core is provided that is movable in the coil in the axial direction, and the movable iron core is fixed to the movable iron core. A limiter that restricts the movement of the limiter when it moves by a predetermined amount, a soft limiter rubber that is arranged so as to face the limiter, and absorbs the impact at the time of a collision, and the soft limiter rubber is compressed by the predetermined amount by the impact. A hard limiter rubber that restricts the movement of the movable iron core is provided.

The hard limiter rubber is arranged facing the limiter so as to come into contact with the limiter, or is provided at the end surface of the movable core so as to come into contact with the support of the coil.

(Operation) According to the present invention, as described above, the movable iron core is disposed so as to be movable in the axial direction in the coil, and the movable iron core is fixed to the movable iron core, A limiter that restricts movement, and is disposed so as to face the limiter,
Since the soft limiter rubber that absorbs the impact at the time of collision and the hard limiter rubber that restricts the movement of the movable iron core when the soft limiter rubber is compressed by a predetermined amount due to the impact are provided, the soft limiter rubber is used in the first stage. Absorbs the shock by colliding with the limiter.

Then, in the second stage, the hard limiter rubber collides with the support body of the limiter or the coil to regulate the further movement of the movable iron core.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a side view of a low noise solenoid showing a first embodiment of the present invention.

In the figure, 1 is a base for mounting a solenoid,
A coil 2 is arranged inside and is supported by a plate 3. The coil 2 has a movable iron core 4 arranged therein, and is moved in the axial direction by a magnetic field generated from a current flowing through the coil 2.

Although the amount of movement of the movable iron core 4 is determined by the current, the limiter 5 is fixed to the movable iron core 4 in order to restrict the movement above a predetermined value. Then, the limiter 5 collides with the plate 3 which constitutes the regulating member, so that the movement is regulated.

By the way, a soft limiter rubber 7 and a hard limiter rubber 8 for absorbing shock are arranged between the limiter 5 and the plate 3 in order to suppress noise generated at the time of the collision. The soft limiter rubber is a 5mm thick silicon sponge,
The hard limiter rubber is made of 3 mm thick urethane rubber. That is, as shown in the figure, the soft limiter rubber 7 is thicker than the hard limiter rubber 8 and has high compressibility and shock absorption. On the other hand, the hard limiter rubber 8 has low compressibility and can reliably stop the movable iron core 4 at a predetermined position.

Therefore, when a current is applied to the coil 2 by a power source (not shown), the movable iron core 4 moves in the A direction, and the limiter 5 contacts the soft limiter rubber 7 during the operation. Then, the soft limiter rubber 7 is compressed and bent until the limiter 5 hits the hard limiter rubber 8, and the shock is absorbed in the meantime. When the limiter 5 hits the hard limiter rubber 8, further movement of the movable iron core 4 is restricted, and the movable core 4 is stopped at that position to complete suction.

FIG. 2 is a sectional view of a low noise solenoid showing a second embodiment of the present invention.

In the figure, 1 is a base for mounting a solenoid,
A coil 2 is arranged inside and is supported by a plate 3. The coil 2 has a movable iron core 4 arranged therein, and is moved in the axial direction by a magnetic field generated from a current flowing through the coil 2.

Although the amount of movement of the movable iron core 4 is determined by the current, the limiter 5 is fixed to the movable iron core 4 in order to restrict the movement above a predetermined value. Then, the limiter 5 collides with the plate 3 which constitutes the regulation member, whereby the movement is regulated.

In addition, a soft limiter rubber 7 for absorbing shock is provided between the limiter 5 and the plate 3 in order to suppress the noise generated at the time of the collision, and in order to obtain the positional accuracy of the movable iron core 4 during suction. A hard limiter rubber 9 is provided on the end surface of the movable iron core 4 facing the bottom of the base 1.

The hard limiter rubber 9 has such a thickness that it does not come into contact with the bottom of the base 1 at the time when the soft limiter rubber 7 starts contacting with the limiter 5, so that when a current is applied to the coil 2 by a power source (not shown). , Movable iron core 4 is A
The limiter 5 comes into contact with the soft limiter rubber 7 during the operation. Then, the soft limiter rubber 7 is compressed and bent until the hard limiter rubber 9 attached to the end surface of the movable iron core 4 hits the bottom surface of the base 1, and the shock is absorbed during that time. Then, when the hard limiter rubber 9 hits the bottom surface of the base 1, further movement of the movable iron core 4 is restricted, and the movable core 4 is stopped at that position to complete suction.

The present invention is not limited to the above embodiment,
Various modifications are possible based on the spirit of the present invention, and these are not excluded from the scope of the present invention.

(Effects of the Invention) As described in detail above, according to the present invention, the movable iron core is provided so as to be movable in the coil in the axial direction, the movable iron core is fixed to the movable iron core, and A limiter that restricts the movement when a fixed amount is moved, a soft limiter rubber that is arranged so as to face the limiter and absorbs a shock at the time of a collision, and the movable limiter is moved when the soft limiter rubber is compressed by a predetermined amount due to the shock. Since the hard limiter rubber that restricts the movement of the iron core is included, in the first stage, the soft limiter rubber collides with the limiter to absorb the impact.

Then, in the second stage, the hard limiter rubber collides with the support body of the limiter or the coil to regulate the further movement of the movable iron core.

Therefore, not only the impact generated during suction can be reduced to reduce noise generated, but also the positional accuracy of the movable iron core during suction can be improved.

Further, by disposing the hard limiter rubber on the end surface of the movable iron core, it is not necessary to form the soft limiter rubber corresponding to the hard limiter rubber, and the soft limiter rubber can be downsized.

[Brief description of drawings]

FIG. 1 is a side view of a low noise solenoid showing a first embodiment of the present invention, FIG. 2 is a sectional view of a low noise solenoid showing a second embodiment of the present invention, and FIG. 3 is a conventional low noise. It is a side view of a solenoid. 1 ... Base, 2 ... Coil, 3 ... Plate, 4 ...
Movable iron core, 5 ... Limiter, 6,8,9 ... Hard limiter rubber, 7 ... Soft limiter rubber.

Claims (3)

[Scope of utility model registration request] Claims: (a) a movable iron core which is disposed in the coil so as to be movable in the axial direction, and (b) is fixed to the movable iron core, and when the movable iron core moves by a predetermined amount, its movement is A limiter for regulating, (c) a soft limiter rubber that is arranged so as to face the limiter, and absorbs a shock at the time of a collision, and (d) a soft limiter rubber of the movable core that is compressed by a predetermined amount by the shock. A low-noise solenoid having a hard limiter rubber that restricts movement. 2. The hard limiter rubber is arranged so as to face the limiter so as to come into contact with the limiter.
Low noise solenoid as described. 3. The low noise solenoid according to claim 1, wherein the hard limiter rubber is arranged on the end surface of the movable iron core so as to come into contact with the support of the coil.