JPS6028368B2 - Operation mechanism using electromagnet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an operating mechanism using an electromagnet, for example, an operating mechanism such as a valve, clutch, or brake that uses an electromagnet, and particularly relates to an improvement for reducing impact noise when an electromagnet is operated. It is.

Generally, in fully automatic washing machines, electromagnets are used to operate the drain valve, brake, and clutch, and the plunger is reciprocated by turning on and off the power to the electromagnet, opening and closing the valve, and operating the clutch. Performs operations such as switching the brakes.

However, it is known that this plunger collides with the main body member constituting the electromagnet at high speed during suction, so the collision force is large and at the same time, it is known that it generates quite a loud collision sound. At present, it cannot be said to be satisfactory as a product to be used.

That is, what is shown in FIGS. 1 and 2 is an example of the above-mentioned conventional operating mechanism.

In the figure, 1 is an electromagnet body, 2 is an electromagnet coil,
Reference numeral 3 denotes a plunger that is attracted by energizing the electromagnetic coil 2, and this plunger 3 is connected to the connecting member 101 by a connecting shaft 5 whose deviation is prevented by a gold inspector 4.

This connecting member 10 is provided with a protrusion 9, and when the plunger 3 is attracted, the lever 8 is moved around the shaft 31 against the brake spring 24 to move the electromagnet main body 1 through the buffer material 7.
It moves it to the side.

Reference numeral 26 denotes a hook part formed integrally with the lever 8, and is adapted to engage with the brake band 27; 25, a brake lining fixed to the brake band 27; and 281, a hook part of the above-mentioned bar 8. When the coil collar 29 rotates in the direction of the arrow shown in the drawing, a ratchet provided at the end stops the rotation and releases a spring clutch (not shown).

Reference numeral 12 denotes an inner spring, which is connected to the connecting member 10 via the hook 11 by its hook portion 23, and 19 is an enlarged spring portion thereof which is engaged with the core village 51.

Reference numeral 13 denotes a cover, which is screwed onto the drain valve main body 52 by screws 14, and an outer spring 21 is inserted between the cover and the core material 51.

15 is a valve body molded from an elastic body such as rubber; 22 is a valve body made of an elastic body such as rubber;
The stepped portion of the valve body abuts against the stepped portion 20 of the core material 51, and the contact portion 16 is moved by the movement of the core material 51 as the plunger 3 sucks.
is opened, and the inlet 18 and outlet 30 are allowed to pass through each other.

Note that 32 is a mounting hole for a screw that fixes the base 6 to the bottom of the washing machine.

With the above configuration, when the electromagnet main body 11 is powered on by a command from a control unit (not shown), the plunger 3 is attracted, but at this time, the inner spring 12 connected to the connecting part and the valve body 15 via the outer spring 21.

Note that the reason why the inner spring 12 is provided here is that if the valve body 15 freezes, only the inner spring 12 will expand to prevent the electromagnet from burning out. At the same time, the protrusion 9 provided on the connecting member 10 moves the lever 8 around the shaft 31, so that the hook 26 is disengaged from the brake band 27, releasing the brake, and simultaneously moving the latch 28 onto the coil collar 2.
9, the plunger 3 crashes into the electromagnet body 1.

Here, the attraction force of the electromagnetic plunger 3 increases rapidly in inverse proportion to the distance between the two, whereas the drag force applied to the plunger 3 is linearly proportional to the moving distance because it is only a spring. The relationship between the attraction force and the drag force is as shown in FIG. 3.

Therefore, as the plunger 3 approaches the electromagnet main body 1, the difference between the above-mentioned attraction force and the drag force increases, and therefore, as the plunger 3 approaches the electromagnet main body 1, it accelerates, resulting in a collision with the scientist and a large An impact sound will be generated.

The present invention reduces and alleviates the above-mentioned drawbacks, that is, reduces the difference in force as described above to weaken the acceleration force, thereby reducing impact noise.
Its purpose is to provide an operating mechanism using electromagnets. The structure of the operating mechanism using an electromagnet according to the present invention includes an electromagnet body, a plunger that is attracted and moved by the electromagnet of the electromagnet body, a lever that rotates about a shaft as a fulcrum as the plunger moves by attraction, and a lever that rotates about a shaft as a fulcrum as the plunger moves by attraction. In an electromagnetic operation mechanism comprising a drag force applying means for applying a drag force in the direction of resistance to the lever, a plunger that provides rotational force to the lever and a contact portion with the lever are moved toward the shaft as the amount of suction movement of the plunger gradually increases. It is equipped with a structure that moves the object so that it approaches the object.

In short, this is an attempt to increase the drag force in accordance with the attraction force of the plunger by using the displacement of the lever for switching between the clutch and brake illustrated above, and to alleviate the collision force and reduce the impact noise. .

Next, one embodiment of the present invention will be described in detail with reference to FIGS. 4 to 6.

In the figure, parts with the same reference numerals as in FIGS. 1 and 2 indicate equivalent parts.

IA is an electromagnet main body that is smaller than the conventional one, 8A is a lever that has a longer distance from the shaft 31 than the conventional one, 41 is an outer protrusion, and 42 is an inner protrusion. The outer protrusion 41 has the same protrusion as the lever 8.
In the state in which it is in contact with A, the distance is longer than the shaft 31 which is the fulcrum, so even the smaller electromagnet main body IA can sufficiently attract the magnet, and the inner protrusion 42 serves as a fulcrum rather than the outer protrusion 41. It is provided at a position close to the shaft 31.

Therefore, the brake spring 24 shown in the figure is
This corresponds to a drag force applying means that applies a force to the lever 8A in a direction that opposes the suction movement of the lever 8A.

In addition, the lever 8A, the outer protrusion 41, and the inner protrusion 4 described above are also included.
2 corresponds to a configuration in which the contact portion of the plunger 3 that applies rotational force to the lever 8A and the bar 8A moves closer to the shaft 31 as the amount of suction movement of the plunger 3 gradually increases.

With the above configuration, as in the case of the one in FIG. 1, the electromagnet main body IA
When the power is turned on, the plunger 3 moves to the electromagnet main body I.
At first, the attraction force is weak because the distance between the plunger 3 and the electromagnet main body IA is large, but the outer protrusion 41, which has a large distance from the fulcrum, comes into contact with the lever 8A and moves. , it will be suctioned smoothly without creating a large drag force.

Then, as the plunger 3 approaches the electromagnet main body IA, the lever 8A is displaced, so that the inner protrusion 42 finally comes into contact with the lever 8A, as shown in FIG.
At the same time, the outer protrusions 4, 1 move away from the lever 8A, and the distance from the fulcrum suddenly decreases, resulting in an increase in drag.

Note that by changing the height difference 1 (see FIG. 5) between the outer protrusion 41 and the inner protrusion 42, the timing at which the lever 8A separates from the outer protrusion 41 and comes into contact with the pseudo-birth protrusion 42 can be adjusted. . Therefore, the relationship between the attraction force and the drag force is as shown in Figure 6. Before the plunger 3 collides with the electromagnet main body IA, the drag force increases rapidly and the difference with the attraction force becomes small, causing acceleration. is reduced, and the collision force is greatly reduced.

Furthermore, the reduction in collision force obtained by downsizing the electromagnet main body IA is added to this, and the impact noise is significantly reduced.

Next, what is shown in FIGS. 7 to 9 is related to another embodiment, in which parts with the same symbols as those in FIGS. 1 to 6 indicate equivalent parts, 43 is a circular arc-shaped projection, and 44 is , is its curvature changing part.

That is, the protrusion that contacts the lever 8A is
4, that is, a continuous arc-shaped protrusion 43 with different curvature, and as the lever 8A is displaced, the contact position is gradually moved to the shaft 31 of the lever 8A, as shown in FIG. It is something.

Therefore, the relationship between the lever 8A and the arcuate protrusion 43 described above is such that the contact portion of the plunger 3 that provides rotational force to the lever 8A and the bar 8A approaches the shaft 31 as the amount of suction movement of the plunger 3 gradually increases. This corresponds to a configuration that moves like this.

With the above configuration, the relationship between the suction force and the drag force becomes as shown in FIG. 9, and it is possible to continuously increase the drag force in accordance with the suction force.

As described in each of the above embodiments, according to the present invention, the electromagnet can be downsized with an extremely simple configuration without changing the conventional configuration, and the drag force that is equal to the attractive force can be reduced. This makes it possible to freely adjust the relationship between the two, making it possible to significantly reduce impact noise, which has traditionally been a problem.

Taking all of the above into account, the present invention provides an extremely simple configuration for an electromagnet operating mechanism that is often used regularly and in large numbers, that is, a major modification of the configuration of the subordinate mechanism. It is possible to significantly reduce impact noise, which often causes problems, without requiring a
It has the effect of making it cheaper,
It can be said to be an excellent invention with remarkable practical effects.

[Brief explanation of drawings]

Fig. 1 is a partially opened front view illustrating a conventional operating mechanism using an electromagnet, Fig. 2 is a sectional view taken along the line A-A in Fig. 1, and Fig. 3 is an electromagnet attraction force in the conventional example. FIG. 4 is a partially opened front view of one embodiment of the electromagnet, FIG. 5 is an explanatory diagram of its operation, and FIG.
FIG. 7 is an explanatory diagram showing the relationship between electromagnetic attraction force and drag force according to the above embodiment, FIG. 7 is a partially related front view of another embodiment of the present invention, and FIG. 9 is an explanatory diagram of the operation thereof, and FIG. 9 is an explanatory diagram showing the relationship between the electromagnet attraction force and the drag force in the other embodiment described above. IA...Electromagnet body, 3...Plunger, 8A...Lever, 31...Shaft, 4
1...Outer protrusion, 42...Inner protrusion,
43... Arc-shaped protrusion, 44... Curvature changing part. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9

Claims (1)

[Scope of Claims] 1. An electromagnet body, a plunger that is attracted and moved by the electromagnetic force of the electromagnet body, a lever that rotates about a shaft as a fulcrum as the plunger moves by attraction, and a lever that rotates in a direction that resists the attraction movement of the plunger. In an electromagnetic operating mechanism consisting of a drag force applying means for applying a force to the lever, the contact portion between the lever and the plunger that applies rotational force to the lever is
An operating mechanism using an electromagnet, characterized in that the plunger moves closer to the shaft as the amount of suction movement of the plunger gradually increases. 2. An electromagnet according to claim 1, in which a plunger that is attracted to an electromagnet body is provided with an outer protrusion and an inner protrusion that contact the lever at different distances from an axis that is a fulcrum of the lever. Operation mechanism by. 3. The operating mechanism using an electromagnet according to claim 1, wherein the plunger attracted by the electromagnet body is provided with an arcuate protrusion that contacts the lever.