JP3370180B2 - solenoid - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for producing a noise-reducing effect of a solenoid. 2. Description of the Related Art In a solenoid in which a movable iron core is attracted to a fixed iron core by energizing a coil, various methods have been conventionally used to reduce operating noise during excitation. FIG. 1 shows the basic structure of a conventional solenoid. When a voltage is applied to a coil 2 wound around a coil bobbin 1,
Magnetic flux flows through a magnetic circuit composed of a magnetic plate 3, a frame 4, a fixed iron core 5, and a movable iron core 6, and the movable iron core 6 is attracted to the fixed iron core 5 by an attractive force. When the power supply to the coil 2 is cut off, the movable iron core 6 is separated from the fixed iron core 5 by the action of the return spring 7 and the like, and moves to the load side. FIG. 1 shows the demagnetized state (2). Here, as a mechanism for reducing the operating sound of the movable iron core 6, an E-ring 8 and a rubber washer 9 are provided near the movable iron core end so that a gap is formed between the fixed iron core 5 and the movable iron core 6. It is common practice to install In such a method, although depending on the hardness of the rubber or the like, there is a limit to noise reduction due to the sound hit by the rubber, and the effect is small. At the time of return, the return side washer B hits the stopper cap 10 to reduce the collision noise. Since the return energy is generally small, no special measures are required. SUMMARY OF THE INVENTION An object of the present invention is to provide a silencing solenoid provided with a mechanism for reducing operation noise. FIG. 2 is a structural view showing an embodiment of the present invention, and the same reference numerals as those in the conventional example denote the same parts. In the figure, reference numeral 11 denotes a sponge washer interposed at a connection between the movable iron core 6 and the load 12.
FIG. 2 shows a demagnetized state. FIG. 3 shows the operating state (excitation).
In this state, the load 12 connected to the movable iron core 6 moves at the same time, the interposed sponge washer 11 first contacts the stopper cap 10 and deflects, and then the rubber washer 9 strikes the plate 3. In this state, a gap occurs between the movable iron core 6 and the fixed iron core 5, and there is no collision noise between the two. Therefore, the impact force due to the excitation, and hence the collision sound, can be absorbed in two stages, which is a more effective noise reduction measure. According to experience, if the gap between the fixed iron core 5 and the movable iron core 6 is set to 0.1 mm or more, the fixed iron cores 5 (3) and 5 The movable iron core 6 does not contact. The sponge washer 11 has a thickness of 50%.
If it shrinks by more than%, it loses its elastic properties due to repeated operation. Therefore, the sponge washer 11 has a thickness of 50%.
% Of the rubber washer 9
Is desirably configured to correspond to the plate 3. The present invention is a muffling type solenoid that absorbs a collision sound in two stages by interposing a rubber washer and a sponge washer, and can be realized only by adding parts of a sponge washer.

[Brief description of the drawings] FIG. 1 is a sectional view of a conventional solenoid structure. FIG. 2 is a sectional view of a solenoid structure of the present invention (in a demagnetized state). FIG. 3 is a sectional view of the solenoid structure of the present invention (excited state). [Explanation of symbols] 1 coil bobbin 2 coils 3 plates 4 frames 5 fixed iron core 6 Movable iron core 7 Spring 8 E-ring 9 Rubber washer (4) 10 Stopper cap 11 Sponge washer 12 Load 13 Return side washer

Claims (1)

(57) [Claims 1] A frame of a coil and a magnetic body surrounding the coil.
And a fixed iron core, and a movable iron core made of a magnetic material. The sponge washer is interposed so as to contact the plate near the terminal end of the armature, and the sponge washer is interposed at the connecting portion between the movable iron core and the load so as to abut the stopper cap. The sponge washer is 50% of its thickness
The solenoid is characterized in that the rubber washer hits the plate when a contraction deflection within the range occurs.