JPS6314403Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a flapper mechanism of a fulcrum type electromagnet that reduces impact noise during operation.

Side views of the shock absorbing structure of the flapper mechanism of a conventional fulcrum type electromagnet are shown in FIGS. 1 and 2. In the structure shown in FIG. 1, a stopper 3a equipped with an elastic damper 2a and an electromagnet 4 are fixed on a support member 9.
The flapper 1a is pivotally attached to a hinge 6 provided on the upright member of the support member 9, and the flapper 1a is attracted to the electromagnet 4, and the attraction force of the electromagnet 4 is applied between the flapper 1a and the support member 9. A spring 7 is provided at a position that resists. The flapper 1a is attracted by the energization of the electromagnet 4, and against the force of the spring 7, the flapper 1a collides with the damper 2a.
The structure shown in FIG. 2 is the same structure as shown in FIG. 1 except for the flapper 1a, and has a protrusion 5b formed on the flapper 1b to reduce the contact area between the protrusion 5b and the damper 2b. However, as is well known,
Since the armature attraction force of an electromagnet is inversely proportional to the square of the distance between the two, and proportional to the square of the applied voltage,
In the structure shown in FIG. 1, when the applied voltage is high, the shock cannot be absorbed completely and an impact sound is generated.

In the structure shown in FIG. 2, the force is concentrated in a small area and a large strain is generated locally in the damper 2b, resulting in poor durability. In the structure shown in FIG. 2, the thickness of the damper 2b can be increased to disperse and absorb impact energy, but when the applied voltage changes, the damper 2b responds to changes in the attractive force of the electromagnet 4.
, the displacement of the protrusion 5b is large, and the flapper 1
A constant amount of displacement cannot be obtained in b.

The object of this invention is to provide a flapper mechanism of a fulcrum type electromagnet that keeps the flapper suction position substantially constant regardless of changes in the applied voltage and produces less impact noise.

This idea involves forming at least one composite protrusion or two large and small protrusions on the flapper, and attaching an elastic damper in the form of a cantilever beam or a beam supported at both ends to the stopper with which the protrusion collides, so that it can collide with the protrusion and the beam. By doing so, when the distance between the electromagnet and the flapper is large and the attractive force is small, the reaction force is small, and when the distance is small and the attractive force is large, the force is dispersed over a large area and the impact energy is absorbed and remains almost constant. This is to restrain amateurs in position.

Examples of this invention will be described below with reference to the drawings.

3 is a side view, and FIG. 4 is a front view of FIG. 3.

A stopper 3c and an electromagnet 4 are fixed to the support member 9, an armature 1c' is pivotally attached to a hinge 6 provided on an upright member on the support member 9, and an electromagnet is installed between the armature 1c' and the support member 9. A spring 7 is tensioned at a position that resists the attractive force between the armature 4 and the armature 1c'. That is, in FIG. 3, the flapper 1c is constantly urged clockwise around the hinge 6, and is in the state shown in FIG. 3 at the contraction limit position of the stopper or spring 7, which limits clockwise rotation (not shown). ing. 1c is a flap formed integrally with the armature 1c', and is provided with a pair of protrusions 5c and 5c' each having a spherical tip.
It is formed in a shape that is lower in height and has a larger radius of curvature than c. Two dampers 2c and 2c' made of elastic material such as foamed silicone rubber are each mounted in a cantilevered manner with one bracket 8c at a higher position with a gap from the displacement limit surface 3c' of the flapper 1c. It is being The mounting dampers 2c, 2c' are integrated and the middle part thereof is fitted into the groove of the bracket 8c, but this may be mounted by other methods. The small protrusion 5c and the large protrusion 5c' are each damper 2.
It is fixed at a position where it collides with c and 2c'. The difference in height between the small protrusion 5c and the large protrusion 5c' is determined by the tip shape, dimensions, damper 2c,
It is determined together with the material of 2c'.

Next, the operation of this embodiment will be explained. When a voltage is applied to the electromagnet 4, the armature 1c' is attracted and the integrally formed flapper 1c is urged counterclockwise around the hinge 6, and moves in the direction of the stopper 3c against the spring force of the spring 7. Displace. As it is displaced, the small protrusion 5c comes into contact with the damper 2c, pushes and bends the damper 2c, and receives the reaction force of the bending stress (FIG. 5). Next, the damper 2c and the displacement limiting surface 3c' come into contact, and the small protrusion 5c compresses the damper 2c and receives this reaction force (FIG. 6). Further, the large protrusion 5c' contacts the damper 2c' with a delay of the height difference from the small protrusion 5c and receives a similar force, and the sum of these forces and the spring force of the spring 7 is the attractive force of the electromagnet 4. The flapper 1c stops at the balanced position (Fig. 7).

In the process of the above operation, the contact area between the protrusion and the damper gradually increases from the apex of the spherical small protrusion 5c to the spherical surface, and the height difference between the large protrusion 5c' and the small protrusion 5c increases. increases step by step and gradually with a delay of . Therefore, until the small protrusion 5c presses and bends the damper 2c and compresses the damper 2c, the damper 2c resists the flapper 1c more than the change in the displacement of the flapper 1c.
The rate of change in the sum of the reaction force as a beam and the reaction force as an elastic material continues to be small, and the beam of the damper 2c' and As an elastic material, the rate of change in the total reaction force is large. If we look at them separately, the small protrusion 5c has a large impact buffering effect, and the large protrusion 5c' has a large function of stopping a certain position. That is, since the resistance increases to a higher degree than the increase in the attractive force between the armatures 1c' of the electromagnet 4, the flapper 1c gradually decelerates and stops at a substantially constant position. Therefore, the amount of overlap between the small protrusion 5c and the damper 2c and the large protrusion 5c' and the damper 2c' is greater than the change in the attractive force, which is inversely proportional to the square of the distance between the armature 1c' of the electromagnet 4 and the electromagnet 4. The height difference, shape, and dimensions of the small protrusion 5c and large protrusion 5c', as well as the materials and dimensions of the dampers 2c and 2c', and their related dimensions, etc., are selected so as to cause a change in the applied voltage. It is necessary to define the large protrusion 5c' so that the resistance force increases more rapidly.

Next, another embodiment is shown in FIG. Figure 8 is a front view, and the side structure is the same as that of the third embodiment.
The same parts as those shown in the figures are indicated by the same reference numerals. The flapper 1d is provided with a small spherical projection 5d at the tip of a large spherical projection 5d' by integrally molding both projections into a gourd shape. 3d is a stopper, and the damper 2d is mounted in the form of a support beam at both ends by brackets 8d at a higher position with a gap from the flapper's displacement limit surface 3d'. As the flapper 1d is attracted by the electromagnet 4 and displaced, the small protrusion 5d moves against the damper 2d.
The damper 2d is pushed and bent by contact with the damper 2d, and receives the reaction force of the bending stress (Fig. 9). Next, the damper 2d and the displacement limiting surface 3d' come into contact, and the small protrusion 5d and the large protrusion 5d' sequentially and simultaneously compress the damper 2d, respectively, and receive this reaction force (FIG. 10). The flapper 1d stops at a position where the sum of these forces, the spring force of the spring 7, and the attractive force of the electromagnet 4 are balanced.

In this embodiment as well, the small protrusion 5d has a large impact buffering effect, and the large protrusion 5d' has a large fixed position restraining effect, as in the previous embodiment.

Dampers 2c, 2c', 2 in these embodiments
The action of d is the reaction force against bending as a beam, and the proportion of the resistance against deformation as an elastic body depends on the material of the dampers 2c, 2c', 2d, the beam dimensions, the point of application of force, the small protrusions 5c, 5d, and the size. It depends on the dimensions of the protrusions 5c', 5d', etc., and the small protrusions 5c, 5d,
The shapes of the tips of the large protrusions 5c' and 5d' are not limited, and may be other quadratic rotating surfaces, for example.

As described in the above two embodiments, according to the flap mechanism of the fulcrum-type electromagnet of this invention, when the distance between the flap and the electromagnet is large, i.e., when the attractive force of the electromagnet is small, the small protrusion receives a small reaction force,
When the distance is small, i.e., when the suction force is large, not only the small protrusions but also the large protrusions have a large contact area to receive the reaction force and absorb the shock, so (1) there is a high shock absorption effect and no vibration or noise.

(2) A nearly constant amount of displacement can be obtained even if the voltage applied to the electromagnet changes.

(3) Excellent durability.

When used in electromagnetic control parts for automobiles, home appliances, etc., it is highly effective in providing quiet and durable products.

[Brief explanation of the drawing]

Figures 1 and 2 are side views of the conventional example, and Figure 3 is a side view of the conventional example, respectively.
The figure is a side view of the embodiment of this invention, Figure 4 is a front view of Figure 3, and Figures 5 to 7 are a part of Figure 4 showing the operation of the embodiment of Figures 3 and 4. FIG. 8 is a front view of another embodiment, and FIGS. 9 and 10 are partially enlarged front views showing the operation of the embodiment of FIG. 8. 1a, 1b, 1c, 1d...flatspa, 1c'...
...Amateur, 2a, 2b, 2c, 2c', 2d...
...Damper, 3a, 3b, 3c, 3d...Stopper, 3c', 3d'...Displacement limiting surface, 4...Electromagnet, 5c, 5d...Small protrusion, 5c', 5d'...Large protrusion, 6 ...Hinge, 7...Spring, 8c, 8d...
Bracket, 9...Supporting member.

Claims (1)

[Claims for Utility Model Registration] 1. In a fulcrum type electromagnet, a flapper having a small protrusion with a large height and a large protrusion with a small height on the surface in the attracting direction of the flapper, and a position where the small protrusion and the large protrusion collide with each other. and a stopper to which a beam-shaped damper made of an elastic body is attached, and the contact area between the protrusion and the damper increases gradually or stepwise as the flapper is attracted by the electromagnet. A flap mechanism of a fulcrum type electromagnet. 2. A flapper mechanism for a fulcrum type electromagnet as set forth in claim 1 of the utility model registration, in which a large protrusion and a small protrusion are integrated, and a small protrusion is formed at the tip of the large protrusion.