JPH0246014Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) This invention relates to improvements in solenoids.

(Prior Art) In general, when a solenoid is attracted to a plunger, the collision noise caused by the plunger colliding with a fixed iron core is loud, and especially when used in a device used at home such as a fully automatic electric washing machine, the collision noise is harsh. It is desired to reduce this. Conventionally, in order to reduce this collision noise, as shown in FIG. It has been proposed that the piston 37 is fixedly attached to the rod 36 so as to be freely protruding and retractable, and a housing 38 surrounds the piston 37 to form an air damper 39, or that the rod 36 is supported by a buffer spring 40.

(Problems to be Solved by the Invention) However, in the configuration shown in FIG. acts upward from the insertion side end 42, so when it collides with the rod 36, the plunger 41
The bobbin 32 is likely to vibrate from side to side, which generates noisy vibration noise, and the cylindrical portion 33 of the bobbin 32 often wears out. In addition, especially in the case of an AC solenoid, the plunger 41
tended to cause chatter vibration during the buffer stroke. Also, fitting the rod 36 into the fixed core 35 is as follows:
This is not preferable because it reduces the magnetic path of the fixed iron core 35.

This invention solves the above-mentioned conventional problems, and aims to provide a solenoid that can suppress the vibration of the plunger and reduce the impact sound of the plunger.

(Means for solving the problem) However, in the solenoid of this lever, a stopper is connected to the exposed end of the plunger, and the stopper fixes a collision receiver having a collision surface to be reciprocated in the plunger stroke direction. This solenoid is equipped with a buffer spring attached to an iron core and biasing the collision receiver in the direction of projecting the plunger.

(Function) In the solenoid of this invention, the stopper collides with the collision receiver during the suction stroke of the plunger, and the plunger collides with the fixed iron core while receiving a braking force from the buffer spring that presses the collision receiver. Since the stopper is connected to the exposed end of the plunger, the plunger suction force by the fixed iron core and the braking force of the plunger acting through the stopper act in a manner that pulls the plunger at both ends, so that the plunger is vibration is suppressed, and noise and wear caused by this vibration are suppressed.

(Example) An example of this invention will be described below with reference to FIGS. 1 and 2.

In the figure, 1 is a stopper made of elastic synthetic resin such as polypropylene, and its central part is connected to the exposed end 2a of the plunger 2 (the end exposed when adsorbed to the fixed core) with a pin 3. has been done. 4
is a collision receiver made by bending and forming a steel plate, and has a collision surface 5 at one end with which the end of the stopper 1 collides, and an intermediate part 6 is a block 9 made of synthetic resin fixed to the side plate 8 of the fixed iron core 7. and the side surface 7a of the fixed iron core 7 in a slidable manner. Reference numeral 10 denotes a sliding surface of a collision receiver that comes into sliding contact with the side surface 7a of the fixed iron core 7. Also 11
is a retaining piece provided at the other end of the collision receiver 4. 1
A rod 2 is connected to the collision receiver 4 by a retaining ring 13, and the rod 12 is inserted into a through hole 14 formed in the block 9 with a small gap.
Reference numeral 15 denotes a buffer spring that urges the collision receiver 4 together with the rod 12 in the direction in which the plunger projects. Note that 16 is a bobbin, 17 is a coil wound around this bobbin, and 1
8 is a corner coil.

In the solenoid 19 having the above configuration, during plunger suction, both ends of the stopper 1 first collide with the collision receivers 4 on both sides at a predetermined distance (for example, 3 to 5 mm before) before the plunger 2 collides with the fixed iron core 7. It collides with surface 5. Since the speed of the plunger 2 is relatively small since it is in the middle of its stroke, and the collision receiver 4 is elastically supported by the buffer spring 15, the collision noise between the stopper 1 and the collision receiver 4 is small. In the buffer stroke in which the plunger 2 is further attracted to the fixed iron core 7, the intermediate portion 6 of the collision receiver 4
is magnetically attracted to the side surface 7a of the fixed iron core 7, a frictional force is generated between the side surface 7a and the sliding surface 10, and a buffering force is further applied by the buffering spring 15, so the collision receiver 4 The plunger 2 is attracted to the fixed iron core 7 while receiving power and therefore also receiving a braking force. As the plunger 2 approaches the fixed iron core 7, the resistance force of the buffer spring 15 increases, so the plunger 2 is attracted to the fixed iron core 7 while receiving a larger braking force. Therefore, the collision noise of the plunger 2 against the fixed iron core 7 is reduced. When the coil 17 is de-energized after attraction, the plunger 2 is separated from the fixed core 7 due to the spring force of the buffer spring 15 and external load, and the collision receiver 4 is also released from being attracted to the fixed core 7. The force of the buffer spring 15 returns it to the illustrated protruding position.

In the above embodiment, since the stopper 1 is made of elastic synthetic resin material, the impact noise of the stopper 1 on the collision receiver 4 is relatively small, which further contributes to reducing the impact noise. The stopper 1 may be made of metal and an elastic material such as synthetic resin or rubber may be attached to the collision surface of the collision receiver, or the stopper 1 may be made of an elastic metal material such as a spring material. Furthermore, in the above embodiment, since the collision receiver 4 is made of a magnetic material, it has the advantage of preventing chatter vibration during the buffer stroke of the plunger 1 due to the attraction force of the collision receiver 4 to the fixed iron core 7. case, plunger shape and bobbin 16
In cases where chatter vibration is not a problem due to the material of the collision receiver 4, the collision receiver 4 may be made of a non-magnetic material.

FIG. 3 shows another embodiment of this invention, in which the collision receiver 21 is formed into a small piece, and the collision receiver 21 is fixedly attached to one end of a rod 22. At the other end, a retaining piece 23 is attached.
This figure shows a structure in which the embodiment is fixedly installed, and other points have the same structure as the embodiment shown in FIG. This embodiment provides the same effects as the embodiment shown in FIG. 1, except that the attraction force of the collision receiver 21 to the fixed iron core 7 is not used for braking the plunger 2.

This invention is not limited to the above embodiments; for example, the specific shapes of each part may be other than those described above. This idea can also be applied to DC solenoids.

(Effect of the invention) As explained above, according to this invention, the braking force of the plunger by the buffer spring is applied to the exposed end of the plunger via the stopper, so vibration of the plunger during the buffer stroke of the plunger is suppressed. Therefore, it is possible to reduce the impact sound of the plunger against the fixed iron core without generating noise or wear caused by the above-mentioned vibrations.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view of a solenoid showing one embodiment of this invention, Fig. 2 is a partially cutaway plan view of the solenoid, and Fig. 3 is a view equivalent to Fig. 1 showing another embodiment of this invention. FIG. 4 is a sectional view showing an example of a conventional solenoid. 1...Stoppa, 2...Plunger, 2a...
Exposed side end, 4... Collision receiver, 5... Collision surface, 7...
...Fixed iron core, 7a...Side, 9...Block, 1
0...Sliding surface, 12...Rod, 14...Through hole, 15...Buffer spring, 19...Solenoid,
21... Collision receiver, 22... Rod.

Claims (1)

[Claims for Utility Model Registration] 1. A stopper is connected to the exposed end of the plunger, and a collision receiver having a collision surface with which the stopper collides is attached to a fixed iron core so as to be reciprocatable in the plunger stroke direction, and the collision receiver is connected to the plunger. A solenoid equipped with a buffer spring that biases it in the protrusion direction. 2. The solenoid according to claim 1, wherein the collision receiver is made of a magnetic material plate and has a sliding surface that slides into contact with the side surface of the fixed iron core. 3. The solenoid according to claim 1 or 2, wherein the stopper is made of an elastic material.