JPS6392830A - Electromagnetic coupling device - Google Patents

Abstract

PURPOSE:To reduce impact, and to lower noise, by adsorbing the armature having an outer, and an inner side holding plate to a rotor when an exciting coil is electrified, and providing, between both holding plates, an elastic member having a means by which the spring constant is increased during the process of adsorption. CONSTITUTION:An armature 8 on which an outer holding plate 10 is fixed is provided so as to be opposite to the sliding surface 5a of an input side rotor 5, and the outer holding plate 10 is connected to an inner holding plate 12 via cushion rubber 11. The inner holding plate 12 is fixed to an output turning shaft 13, and further a spring plate 60 in which the spring constant is increased after the cushion rubber 11 is deformed to abut on it is provided. Herein, if an exciting coil 3 is electrified, the armature 8 is adsorbed to the rotor 5 to deform cushion rubber 11, and is brought into close contact with the sliding surface 5a of the rotor 5 together with the outer holding plate 10. Thus, by the effect of the spring plate 60, impact can be reduced, and noise can be lowered.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electromagnetic coupling device for interrupting power transmission to a supercharging device, etc. of a vehicle, and in particular, an electromagnetic coupling device H that effectively functions as an electromagnetic clamp. It's about location.

[Prior Art] In recent years, luxury cars have been equipped with a supercharger, and the supercharger is intermittently driven by an electromagnetic clutch when the engine reaches a predetermined rotation speed. This electromagnetic clutch has a rotor equipped with an excitation coil and an annular armature, and the armature can move toward and away from the rotor. An outer holding plate having a non-circular, for example, cross-shaped flange is attached to this armature, and an inner holding plate having the same shape as the outer holding plate is connected to the outer holding plate via an elastic member such as a cushion rubber or a leaf spring. It is set in the core state. This inner holding plate is ultimately connected to the supercharger tube O via a drive shaft or the like.

During operation, the armature is attracted to the rotor by energizing the excitation coil, and the rotation of the rotor is transmitted to the bellows through the outer holding plate, the cushion rubber, the inner holding plate, and the rotating shaft in this order.

[Problems to be Solved by the Invention] In this case, the cushion rubber and leaf spring on the inner holding plate side are subjected to deformation force, but especially in the case of leaf springs, the armature's absorption rate against the rotor is large, and in this case, There is a problem that a large amount of noise is generated which leads to abnormal noise.

Therefore, the present invention was made to eliminate the above-mentioned drawbacks, and its purpose is to reduce the impact of the armature on the rotor by the elastic member, thereby reducing the number of noisy customers. 1i connection 5A position is provided.

[Means for Solving the Problems] The present invention includes a rotor that rotates in response to rotational force, and a rotor that is provided so as to be movable toward and away from the rotor and that is connected to the rotor by being moved closer to the rotor by energization of an excitation coil. an armature that rotates, an outer holding plate having a non-circular flange attached to the armature and curved so that the outer peripheral edge is point symmetrical; and a flange corresponding to the flange of the outer holding plate. An inner holding plate is arranged concentrically with the outer holding plate with a predetermined spacing, and is provided between the outer holding plate and the inner holding plate. an elastic member for transmitting the signal to the inner holding plate side via the outer holding plate; and means for increasing the spring constant of the elastic member by coming into contact with the elastic member during the suction process of the armature 11 to the rotor. The configuration is adopted.

[Function] According to the present invention configured as described above, the spring constant of the elastic member becomes large during the adsorption process of the armature to the rotor, so that the impact during adsorption is alleviated.

[Effects of the Invention] According to the present invention, the spring constant of the elastic member becomes large during the adsorption process of the armature to the rotor, so that the impact during adsorption is alleviated, contributing to a reduction in noise. Moreover, it is possible to provide an electromagnetic coupling device with superior effects.

[Example] The present invention will be explained in detail below based on a first embodiment.

FIG. 1 (a>, (1)) is a front view showing an electromagnetic clutch as an electromagnetic coupling device of the present invention, and a longitudinal sectional view thereof taken along line Δ-0-A. This electromagnetic clutch is used to connect and disconnect the transmission of engine driving force to an automobile's supercharger.

First, in Fig. 1 (1)), 1 is the housing of the super chito-jar, and 2 is the stator housing made of magnetic material, and inside it is a stator housing made of a plastic material wound into a cylindrical shape in a winding frame 3a. An excitation coil 3 is disposed, and a winding frame 3a is fixed to the stator housing 2 by caulking. This excitation coil 3 is connected to an external power source by a lead wire (not shown) as shown in Fig. 2, and when energized forms a magnetic circuit as shown by the broken line i in Fig. 1(b). It has become.

Also, the stator housing 2 is attached to the flange 2a.
This is fixed to the supercharger housing 1 by a circlip 4 via a flange 2a. A rotor 5 is formed by joining a pulley 6 by welding or the like, and is rotatably mounted on the housing 1 via a bearing 7. An armature jt8 is provided opposite the sliding surface 5a of the rotor 5, and an outer holding plate 10 is fixed to the armature 8 with rivets 9. The outer holding plate 10 is connected to the inner holding plate 12 via a cushion rubber 11 as an elastic member. The outer holding plate 10 is →
- The inner holding plate 12 has a flange 10d having a shape similar to that of the outer holding plate 10, and the flange 12d of the inner holding plate 12 is spaced apart from that of the outer holding plate 10 by a predetermined distance. are arranged concentrically. and,
Each flange 1 of these outer holding plate 10 and inner holding plate 12
Cushion rubber 11 as an elastic member is provided between 0d and 112d in a manner similar to that previously described.

And the flange 1 of the outer holding plate 10 and the inner holding plate 12
The portion of the cushion rubber 11 existing on the outer peripheral edge between 0d and 12d is provided with empty holes 50 at four locations at approximately 90 degree angular intervals. And inner holding plate 1
As shown in FIG. 2, a spring plate 60 is attached to the spring plate 2, the tip of which faces the cushion rubber 11. This spring plate 60 acts to increase the spring constant of the cushion rubber 11.

Here, the outer holding plate 10 and the inner holding plate 12 are fixed to the cushion rubber 11 in the following manner.

That is, first, adhesive was applied to the adhesive surfaces of the outer holding plate 10 and the inner holding plate 12, that is, the inner surface of the flange 10d of the outer holding plate 10 and the outer surface of the flange 12d of the inner holding plate 12. The flanges 10d and 12d of the outer holding plate 1o and the inner holding plate 12 are separated by a predetermined distance and filled into a mold. Then, each of the flanges 10d and 12d in the mold is filled with unvulcanized rubber, and then the mold is closed and heated to bond the outer holding plate 10, the inner holding plate 12, and the rubber 11 with adhesive. At the same time, the cushion rubber 11 is molded into a predetermined shape.

In addition, the inner holding plate 12 is integrated with the hub 1.
A hexagonal nut 14 is used to connect and fix the rotary shaft 138 to a rotating shaft 138 which is connected to a propeller (not shown) of the supercharger via a hexagonal nut 14. In this case, the hub 13 and the rotating shaft 13a are connected by a key 13b. At this time, key 13
Serrations or splines may be used instead of b.

The outer holding plate 10 and the armature 8 are connected by three rivets 9 provided on the flange 10d of the outer holding plate 10, as shown in FIG. There are four holes formed in the cushion rubber 11 so as to be located in the middle of the hole 50, and there are four holes at angular intervals of approximately 90 degrees, and these holes act as a relief for the deforming force applied to the cushion rubber 11. However, these holes 51 is not always required and may be provided as needed.

Next, the operation of this embodiment will be explained.

When the supercharger is started, when the excitation coil 3 is energized, a magnetic flux is generated as shown by the broken line i in Fig. 1(b),
A force that attracts the rotor 5 is applied to the armature 8. As a result, the cushion rubber 11 is elastically bent, and the armature 8 moves in the axial direction together with the outer holding plate 10, and is brought into close contact with the sliding surface 5a of the rotor 5 by suction. At this time, the cushion rubber 11 is deformed, and this rubber 11 comes into contact with the spring plate 60 and deforms. As a result, the spring constant of the elastic rubber 11 is increased, so that the impact of the armature 8 on the rotor 5 is alleviated, and the generation of noise is reduced, contributing to noise reduction.

Since the rotor 5 is driven by an automobile engine (not shown) via a pulley 6 and a belt (not shown), when the rotor 5 and armage P (3) are attracted to each other, the driving force is transmitted to the armature 8. The rotation is transmitted to the outer holding plate 10 via the rivet 9, and further transmitted to the propeller of the supercharger via the cushion rubber 11, the inner holding plate 12, the hub 13, and the rotating shaft 13a in this order.

However, at this time, since the supercharger is still stopped, the outer holding plate 12 remains stationary under the force of the load such as the propeller and the moment of inertia. Therefore, the driving force on the driving side received via the outer holding plate 10 and the force due to the moment of inertia of the inner holding plate 12 in a stationary state are impulsively applied to the rubber cushion 11, so that it is subjected to a torsionally deforming force in the rotational direction.

Although torsional deformation force is applied to the cushion rubber 11 in this way, in the above embodiment, the hole portion 50 is provided at the outer edge of the cushion rubber 1111, so that the cushion rubber 11 is not subjected to shearing force unlike the conventional case. Therefore, unlike the conventional case where the cushion rubber 11 is subjected to repeated shearing forces, the cushion rubber 11 does not deteriorate prematurely due to fatigue and can be used for a long period of time. It has a longer lifespan.

When the excitation coil 3 is powered by 1 gi, power transmission by the electromagnetic clutch is cut off. At this time, the armature 8 is moved to the rotor 5 due to the restoring force of the elastic rubber 11.
It returns to its original position separated from the sliding surface 5a by a predetermined gap.

Next, FIG. 3 shows a second embodiment of this invention.

According to this second embodiment, a bent portion 61 is formed on the outer peripheral edge of the inner holding plate 12, and this bent portion 61 is used to prevent the spring plate 60 from being attached when the armature 118 is attracted to the rotor 5.
It comes into contact with. Even with this configuration, the same effects as in the first embodiment can be obtained.

Next, FIG. 4 shows a third embodiment of the present invention.

In this third embodiment, a hook portion 60a 2Fr: is provided at one end of the spring plate 60, and the hook portion 60a is opposed to a protrusion 8a formed on the armature 8. When the armature 8 is attracted to the rotor 5, the protrusion PI 18a of the armature 8 engages with the hook portion 60a of the spring plate 60. Even with this configuration, the same effects as in the first embodiment can be obtained.

In each of the above embodiments, the same parts as in the first embodiment are given the same reference numerals, and only different parts are explained.

In addition, various changes may be made without departing from the gist of the invention, such as that the application target is not limited to automobile superchargers but may also be applied to air conditioner compressors.

[Brief explanation of the drawing]

FIGS. 1(a) and 1(b) are a top view partially showing the structure of a first embodiment of an electromagnetic clutch as an electromagnetic coupling device of the present invention with the left half removed, and A-0-A of the top view. Figure 2 is a cross-sectional view of the main parts of the electromagnetic clutch.
3 is a diagram corresponding to FIG. 2 of a second embodiment of the present invention, and FIG. 4 is a diagram corresponding to FIG. 2 of a third embodiment of the present invention.

Claims (1)

[Scope of Claims] 1) A rotor that rotates in response to rotational force, and an armature that is movable toward and away from the rotor and is moved in close proximity to the rotor by energization of an excitation coil and connected to the rotor and rotates integrally with the rotor. , an outer holding plate having a flange attached to the armature and having an outer peripheral edge bent into an appropriate shape, and a flange corresponding to the flange of the outer holding plate, with a predetermined interval left on the outer holding plate. The inner holding plate is arranged concentrically, and the excitation coil is provided between the outer holding plate and the inner holding plate, and when the excitation coil is energized, the rotational force on the armature side is transferred to the inner holding plate side through the outer holding plate. An electromagnetic coupling device comprising: an elastic member for transmitting a signal to the rotor; and means for increasing a spring constant of the elastic member by coming into contact with the elastic member during a suction process of the armature to the rotor.