JPH054580Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to an electromagnetic coupling device for interrupting power transmission to a vehicle's supercharger, etc., and in particular, relates to an electromagnetic coupling device that effectively functions as an electromagnetic clutch. It is something.

[Prior Art] In recent years, luxury cars have been equipped with a supercharger, or supercharger, and when the engine reaches a predetermined rotational speed, the supercharger is intermittently driven by an electromagnetic clutch. This electromagnetic clutch has a rotor equipped with an excitation coil and an annular armature, which is movable toward and away from the rotor. An outer holding plate having a non-circular, for example, a cross-shaped flange is attached to this armature, and an inner holding plate having the same shape as the outer holding plate is provided approximately concentrically with the outer holding plate through an elastic member such as cushion rubber. It is being This inner holding plate is ultimately connected to the propeller of the supercharger 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 propeller through the outer holding plate, cushion rubber, inner holding plate, and rotating shaft in this order. At this time, in order to withstand the torsional deformation force that is applied to both the inner and outer retaining plates, their flanges are formed in a cross shape as described above.

[Problem to be solved by the invention] In this case, the cushion rubber between the inner and outer retaining plates is subjected to deformation force, and shearing force is repeatedly generated in the circumferential direction, especially at the outer periphery, so that the elastic member such as the cushion rubber becomes fatigued. If this occurs, the supercharger may deteriorate, shorten its lifespan, impair its original connection function, and eventually cause the entire supercharger to lose its function.

Therefore, this invention was devised to eliminate the above-mentioned drawbacks.The purpose of this invention is to prevent the elastic member from receiving shearing force so that it does not deteriorate easily and maintains a good cushioning effect over a long period of time. It is an object of the present invention to provide a practically superior electromagnetic coupling device that contributes to the longevity of an elastic member and maintains the coupling function without loss.

[Means for Solving the Problems] The electromagnetic coupling device according to this invention includes a rotor that rotates in response to rotational force, and a proximity displacement that is provided to be movable toward and away from the rotor by energization of an excitation coil. an armature that is connected to the armature and rotates integrally; an outer holding plate that is attached to the armature and has a flange bent to surround a substantially cross-shaped or substantially Y-shaped hole concentric with the armature; an inner holding plate having a flange curved in a shape corresponding to the flange of the outer holding plate and arranged concentrically with the outer holding plate with a predetermined spacing; and the outer holding plate and the inner holding plate; an elastic member that is provided between and transmits the rotational force on the armature side to the inner holding plate via the outer holding plate by energization of the excitation coil; a hole formed in the elastic member between the outer peripheral edges, and the hole has a width wider at both ends corresponding to the outer peripheral edge than at the center. It is characterized by

[Function] According to the invention configured as described above, the elastic member receives a shearing force at the outer periphery due to the holes formed in the elastic member at the outer periphery of the inner and outer holding plates. Since this problem is eliminated, the durability of the elastic member is increased and its lifespan is extended, and the connection function is maintained without fail.

[Effect of the invention] According to this invention, the elastic member is prevented from receiving shearing force at the outer periphery due to the holes formed in the elastic member at the outer periphery of the inner and outer holding plates. Therefore, it is possible to provide an electromagnetic coupling device that has excellent practical effects, such as increasing the durability of the elastic member and extending its life, and maintaining the coupling function without loss. be.

[Example] This invention will be explained in detail below based on the first example.

Figures 1a and 1b are front views showing an electromagnetic clutch as an electromagnetic coupling device of this invention, and its A-O-
It is a longitudinal cross-sectional view along the A line. This electromagnetic clutch is used to connect and disconnect the transmission of engine driving force to an automobile's supercharger.

First, in FIG. 1b, 1 is a supercharger housing, 2 is a stator housing made of a magnetic material, and an excitation coil 3 wound in a cylindrical shape around a plastic winding body 3a is disposed inside the stator housing. The winding body 3a is fixed to the stator housing 2 by caulking. And this excitation coil 3 is the second
As shown in the figure, it is connected to an external power source by lead wires a and b, and when energized, a magnetic circuit is formed as shown by the broken line i in FIG. 1b.

Further, a mounting flange 2a is joined to the stator housing 2, and this mounting flange 2
It is fixed to the housing 1 of the supercharger by a circlip 4 via a. 5 is a rotor to which a pulley 6 is connected by welding, etc., and a bearing 7
It is rotatably attached to the housing 1 via. An armature 8 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 has a cross-shaped flange 10d, and the inner holding plate 12 also has a flange 12d having the same shape as the outer holding plate 10. The flange 12d of the inner holding plate 12 is spaced at a predetermined distance from that of the outer holding plate 10. They are arranged concentrically with the rest. Each flange 1 of these outer holding plate 10 and inner holding plate 12 is
Cushion rubber 11 as an elastic member is provided between 0d and 12d in the manner described above. Then, empty holes 50 are formed in the cushion rubber 11 at the outer peripheral edge between the flanges 10d and 12d of the outer holding plate 10 and the inner holding plate 12 at four locations at angular intervals of about 90 degrees. It is set up.

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, the adhesive surface of the outer holding plate 10 and the inner holding plate 12, that is, the flange 1 of the outer holding plate 10
0d inner surface and flange 12 of inner retaining plate 12
d, and the outer holding plate 10 and the inner holding plate 12 to which the adhesive is applied are coated with adhesive.
The flanges 10d and 12d of are separated from each other by a predetermined distance and filled into a mold. And each flange 10 in the mold
Fill the space between d and 12d with unvulcanized rubber, then close the mold, heat it, and use adhesive to bond the cushion rubber 11 to the outer holding plate 10 and inner holding plate 12. Form into shape.

The inner holding plate 12 is fixedly connected to a rotating shaft 13a connected to a propeller (not shown) of a supercharger with a hexagonal nut 14 via a hub 13 that is integral with the inner holding plate 12. In this case, the hub 13 and the rotating shaft 13a are connected by a key 13b. At this time, a serration, a spline, or the like may be used instead of the key 13b. Further, 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. 1a. In addition, 51 is cushion rubber 11
There are four holes formed at the center of the cavity 50 at angular intervals of approximately 90 degrees, and these holes act as a relief for the deformation force applied to the cushion rubber 11. However, these holes 51 are not always required and may be provided as needed.

Next, the operation of this embodiment will be explained.

When the compressor is started, when the excitation coil 3 is energized, a magnetic flux is generated as shown by the broken line i in FIG. 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.

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 armature 8 are attracted to each other, the driving force is transmitted to the armature 8, causing the armature 8 to rotate. It 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, the supercharger is still stopped, so the outer holding plate 12 remains stationary under the force of the load from 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 applied to the cushion rubber 11 with an impact, so that the cushion rubber 11 receives a torsional deformation force in the rotational direction. Become.

Although torsional deformation force is applied to the cushion rubber 11 in this manner, in the above embodiment, the void portion 50 is provided at the outer peripheral edge of the cushion rubber 11, so that the cushion rubber 11 is not subjected to shearing force unlike the conventional case. Therefore, unlike in the past, where the cushion rubber 11 was 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, increasing durability and extending the lifespan. It is something to do.

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

Next, FIGS. 3a and 3b show a second embodiment of this invention. According to this second embodiment, the inner holding plate 12
A pressing piece 52 is integrally formed on the outer peripheral edge of the rotor, and this pressing piece 52 contacts the outer peripheral edge of the outer holding plate 10 and presses the outer holding plate 10 slightly toward the rotor. Therefore, the cushion rubber 11 as an elastic member is in a state in which it is deformed in the same direction in advance. As a result, when the excitation coil 3 is disconnected and the armature 8 separates from the rotor 5, the elastic force of the cushion rubber 11 causes the armature 8 to slightly vibrate toward and away from the rotor 5; Vibrations are attenuated early to prevent the armature 8 from inadvertently interfering with the rotor 5. For this reason, unlike the method in which a thin rubber plate is interposed between the holding plate and the armature to obtain the same effect as above, there is a risk that the rubber plate will receive concentrated load and deteriorate due to fatigue, and the thickness of the rubber plate during manufacturing. By controlling dimensions, it is possible to omit process control, which in turn contributes to cost savings.

Next, FIG. 4 shows a third embodiment of this invention.
In this third embodiment, the outer peripheral edge X of the outer holding plate 10
and the outer peripheral edge Y of the inner holding plate 12 are configured to approach each other with a slight gap left. When the armature 8 configured as described above rotates, the armature 8 slightly oscillates along its rotating surface, but the outer peripheral edge X of the outer holding plate 10 comes into direct contact with the outer peripheral edge Y of the inner holding plate 12. Therefore, eccentric movement of the armature 8 can be effectively suppressed. Therefore, when the armature 8 and the rotor 5 are connected, the magnetic flux received from the excitation coil 3 will not become uneven in the armature 8, the transmitted torque will not drop, and the predetermined clutch action will be maintained without fail. . In this case, since the cushion rubber 11 has the holes 50 as described in the first embodiment, it is convenient to arrange the outer holding plate 10 and the hub 13 close to each other at the outer peripheral edge.

Figures 5a and 5b show a fourth embodiment of this invention.
In this fourth embodiment, the distance between the outer holding plate 10 and the inner holding plate 12 is set so that it gradually becomes wider in the radial direction. For example, as shown by symbols A and B in the figure for convenience, the interval A is larger than the interval B. With this setting, when the cushion rubber 11 is deformed between the outer retaining plate 10 and the inner retaining plate 12, the amount of deformation is approximately uniform throughout, and the outer retaining plate 10 and the inner retaining plate 12 are arranged with elastic members at equal intervals. Unlike cushion rubber 11 which is locally significantly deformed, the cushion rubber 11 is not subject to early fatigue deterioration and is durable, contributing to a long service life.

Further, in the second embodiment, the pressing piece 52 is formed integrally with the inner holding plate 12, but this pressing piece may be formed separately from the inner holding plate 12. Further, in the first embodiment described above, holes may be formed when the cushion rubber 11 is filled.

FIG. 6 shows a fifth embodiment of this invention.

In the case of this fifth embodiment, the difference from each of the above embodiments is that the flanges 1 of both the inner and outer retaining plates 12, 10 are
2d and 10d are both formed in a Y-shape so that the outer peripheral edges are line symmetrical. Even with this configuration, the same effects as in each of the above embodiments 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 the different parts are explained.

In addition, in the specific implementation, the object of application is not limited to automobile superchargers, but may also be applied to compressors of air conditioners, and various changes can be made without departing from the gist of the invention.

[Brief explanation of the drawing]

Figures 1a and 1b are a top view partially showing the structure of the first embodiment of the electromagnetic clutch as an electromagnetic coupling device of this invention with the left half removed, and a longitudinal section along the line A-O-A of the top view. Figure 2 is a perspective view showing the structure of the first embodiment of the electromagnetic clutch, Figure 3a,
b is a diagram corresponding to Figure 1 of the second embodiment of this invention, and Figure 4.
The figure is a top view of the electromagnetic clutch of the third embodiment of this invention, Figure 5 is a view equivalent to Figure 1 of the fourth embodiment of this invention, and Figure 6 is equivalent to Figure 1 of the fifth embodiment of this invention. It is a diagram. In the figure, 3... excitation coil, 5... rotor, 8...
... Armature, 10 ... Outer holding plate, 11 ... Cushion rubber (elastic member), 12 ... Inner holding plate,
13... Hub, 13a... Rotating shaft, 13b... Key, 50... Hole portion, 51... Hole portion, 52... Pressing piece.

Claims (1)

[Claims for Utility Model Registration] 1. A rotor that rotates in response to rotational force, and an armature that is movable in directions toward and away from the rotor and is connected to the rotor by being moved close to the rotor when energized by an excitation coil, and rotates integrally with the rotor. and an outer holding plate attached to the armature and having a flange bent to surround a substantially cross-shaped or substantially Y-shaped hole concentric with the armature, and having a shape corresponding to the flange of the outer holding plate. an inner holding plate having a curved flange and arranged concentrically with the outer holding plate with a predetermined spacing; and an energizing coil provided between the outer holding plate and the inner holding plate to energize the excitation coil. an elastic member that transmits the rotational force on the armature side to the inner holding plate via the outer holding plate; and an elastic member between the outer peripheral edge of the outer holding plate and the outer peripheral edge of the inner holding plate. An electromagnetic coupling device comprising: a cavity formed therein, wherein the cavity has a width wider at both end portions corresponding to the outer peripheral edge than at a central portion. 2. Between the inner holding plate and the outer holding plate,
The electromagnetic coupling device according to claim 1, characterized in that the inner holding plate and the outer holding plate gradually expand toward the outside in these radial directions.