JPH085387Y2 - Electromagnetic coupling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an electromagnetic coupling device for connecting / disconnecting transmission of rotational torque and braking of a rotating body by excitation and non-excitation of an electromagnetic coil.

[Conventional technology]

Conventionally, for example, an armature assembly of an electromagnetic clutch mounted on a refrigerant compressor or the like as an air conditioner for an automobile is disclosed in, for example, Japanese Utility Model Publication No. 2-18821 and is configured as shown in a vertical sectional view in FIG. There is. That is, a stopper plate 2 formed in a circular plate shape is tacked to a flange 1a of an armature hub 1 attached to an input shaft of a compressor (not shown), and an outer peripheral portion of the stopper plate 2 is circumferentially arranged. For example, damper covers 3 each having an L-shaped cross section are welded at three equally divided portions. Reference numeral 4 is an armature formed in the shape of an annular plate, and a small diameter portion 6a of a rivet 6 in which a damper rubber 5 is fitted and fixed to the outer circumference in a stepped hole 4a formed at a position corresponding to the damper cover 3.
Is fitted through after penetrating the hole 2a of the stopper plate 2 and fixed by caulking, and the damper rubber 5 is
It is press-fitted and fixed to the inner peripheral surface of the damper cover 3. Reference numeral 7 is a stopper rubber fitted into the rivet 6 and interposed between the armature 4 and the stopper plate 2. The armature assembly configured as described above is used in the armature hub 1
Is fitted and fixed to the input shaft of the compressor, and the plane of the armature 4 is opposed to the end surface of the rotor rotatably fitted to the cylindrical portion of the compressor via bearings. .

With this configuration, when the electromagnetic coil provided inside the rotor via the yoke is energized, the magnetic flux attracts the armature 4 to the rotor, and the rotation on the rotor side is transmitted to the input shaft. However, at this time, the rivet 6 also moves to the rotor side together with the armature 4, so that the damper rubber 5 is compressed in the damper cover 3. Therefore, the suction noise is not generated, the shock due to the suction is alleviated, and the rapid rise of the torque can be prevented.

If the electromagnetic coil is de-energized from this state, the restoring force of the damper rubber 5 separates the armature 4 from the rotor.

Further, FIG. 3 is a vertical cross-sectional view of an armature assembly incorporated in an electromagnetic coupling device disclosed in, for example, Japanese Patent Publication No. 2-2009, in which a stopper plate 2 and a damper cover 3 are die cast products made of aluminum. Other than being integrally formed as, the configuration is almost the same as the above example, and the same operation is performed.

[Problems to be solved by the device]

However, among the armature assemblies in such a conventional electromagnetic coupling device shown in FIG. 2, since the damper cover 3 is welded to the plane of the stopper plate 2, the axial dimension becomes long, For example, when this is attached to the compressor, the installation space of the entire compressor increases.

Further, the armature assembly shown in FIG. 3 has an axial dimension shorter than that shown in FIG. 2 by a dimension obtained by subtracting the thickness of the bottom plate of the damper cover 3 from the thickness of the stopper plate 2. This alone is not enough, and further reduction in axial dimension is required.

The present invention has been made in order to meet such a demand, and an object thereof is to provide an electromagnetic coupling device capable of significantly reducing the axial dimension.

[Means for solving the problem]

In order to achieve such an object, according to the present invention, an outer periphery of an armature is supported by a stopper plate, and the outer periphery of the armature is provided in an armature that is magnetically attracted to an attracting surface of a rotor or a yoke by energizing an electromagnetic coil. A concave portion that bulges toward the stopper plate side is formed in the portion, the outer peripheral portion of the stopper plate is brought into contact with the bottom plate of the concave portion, and the rivet fixed to the stopper plate and protruding from the central portion of the concave portion and the concave portion. A damper rubber was filled between the inner peripheral surface and the inner peripheral surface.

[Action]

When the electromagnetic coil is energized while the rotor is rotating, the generated magnetic flux causes the armature to be magnetically attracted to the rotor and power is transmitted.At this time, the damper rubber elastically deforms and absorbs the impact, so the adsorption noise is generated. Does not occur,
It is possible to prevent the sudden rise of the torque by absorbing the shock caused by the adsorption. When the electromagnetic coil is de-energized from this state, the damper rubber is restored and the armature separates from the rotor.

Since the damper rubber is filled in the concave hole of the armature and directly contacts the armature without using the stopper plate, the axial dimension is greatly reduced.

〔Example〕

FIG. 1 is a longitudinal sectional view of an electromagnetic clutch for a compressor to which an electromagnetic coupling device according to the present invention is applied. In the figure, an electromagnetic clutch 11 includes a rotor 14 which is supported on a cylindrical protruding portion 12a of a compressor 12 via a bearing 13 so as to rotate freely, and a V groove 14a formed on the outer peripheral portion of the rotor 14 and A V-belt drivingly connecting the engine side and the rotor 14 is stretched between a V-pulley (not shown) and the engine side. In the annular groove 14b of the rotor 14, a yoke 16 in which an electromagnetic coil 15 is installed is fixedly fitted to the compressor 12 by a mounting plate 17, while the cylindrical protrusion 12a of the compressor 12 is fitted. The input shaft 18 that penetrates through and is drivingly connected to the rotating part of the compressor 12,
The armature hub 20 and the stopper plate 21 of the armature assembly, which are generally designated by the reference numeral 19, form a serration fitting portion.
It is fixed with 22 and bolts 23. Stopper plate 21
Is formed in a dish shape so that the fixing portion by the bolt 23 serves as the bottom portion, and the rivet 24 is provided at a portion where the outer peripheral portion is circumferentially divided into a plurality of portions (three in this embodiment). 14
Projecting to the side, inserted into the hole of the stopper plate 21 and fixed by caulking. Further, an armature 25 having a hole 25a having a diameter larger than that of the flange 20a of the armature hub 20 is disposed between the stopper plate 21 and the rotor 14, and the outer periphery of the armature 25 is made of three plastic materials. The recess 25b is formed by engaging the rivet 24 in the center thereof, and a damper rubber 26 is vulcanized and solidified and filled between the inner peripheral surface of the recess 25b and the rivet 24. . The filled damper rubber 26 is compressed when the rivet 24 is caulked. The tip 24a of the rivet 24 and the opening 25c of the recess 25b are chamfered in an arc shape. 14c and 25d are demagnetization holes that bypass the magnetic flux.

The operation of the electromagnetic coupling device configured as described above will be described. If the electromagnetic coil 15 is energized while the rotor 14 is driven from the driving side and is rotating, a magnetic flux passing through the yoke 16-rotor 14-armature 25-yoke 16 is generated, and the armature 25 is magnetically attracted to the rotor 14. As a result, power is transmitted and the armature 25 is rotated integrally with the rotor 14, so that the stopper plate 21 integrated by the armature 25 and the rivet 24 is rotated, and is integrated via the stopper plate 21 and the armature 20. The input shaft 18 rotates.

When the electromagnetic coil 15 is de-energized from this state, the armature 25 separates from the end surface of the rotor 14 and the input shaft of the compressor 12
18 stops.

When the power is transmitted, since the damper rubber 26 is provided, the suction noise is not generated, the shock generated at the moment when the armature 25 is sucked by the rotor 14 is mitigated, and the rapid rise of the torque can be prevented.

And FIG. 1 showing this device and FIG. 2 showing the prior art.
Comparing FIG. 3 and FIG. 3, the conventional one shown in FIG. 3 has an axial direction which is smaller than that shown in FIG. 2 by the thickness of the stopper plate 2 minus the thickness of the bottom plate of the damper cover 3. However, in the present invention shown in FIG. 1, only the thickness of the armature 25 minus the thickness of the head 24b of the rivet 24 is subtracted from that shown in FIG. This is effective because the axial dimension becomes shorter.

In the present embodiment, an example was shown in which the damper rubber 26 was vulcanized and solidified between the rivet 24 and the inner peripheral surface of the recess 25b and filled, but the damper rubber 26 is vulcanized and adhered to the outside of the rivet 24,
The outside of the damper rubber 26 is placed in the recess 25b of the armature 25.
It may be press-fitted inside.

Further, in the present embodiment, an example in which the recess 25b serving as a damper cover is integrally formed in the armature 25 is shown, but a damper cover separate from the armature 25 is provided and fitted and fixed in the hole formed in the armature 25. You may. Further, the electromagnetic coupling device according to the present invention is not only applied to the compressor as in the embodiment, but can be applied to other devices in the same manner and the same effect can be obtained. The same applies to brakes.

[Effect of device]

As is apparent from the above description, according to the present invention, the outer periphery of the armature is provided in the electromagnetic coupling device having the armature that is supported by the stopper plate and magnetically attracted to the attracting surface of the rotor or the yoke by energizing the electromagnetic coil. A concave portion that bulges toward the stopper plate side is formed in the portion, and the outer peripheral portion of the stopper plate is brought into contact with the bottom plate of this concave portion,
By filling the damper rubber between the rivet fixed to the stopper plate and protruding from the center of the recess and the inner peripheral surface of the recess, the axial dimension of the damper rubber holding portion is larger than that of the conventional electromagnetic coupling device. It is possible to reduce the installation space of the equipment in which this device is incorporated, which is effective.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an electromagnetic clutch showing an embodiment of an electromagnetic coupling device according to the present invention, and FIGS. 2 and 3 are vertical sectional views of an armature assembly provided in a conventional electromagnetic coupling device. . 11 …… electromagnetic clutch, 12 …… compressor, 14 …… rotor, 15
…… Electromagnetic coil, 16 …… Yoke, 21 …… Stopper plate, 24 …… Rivets, 25 …… Armature, 25 b …… Recesses, 26 …… Damper rubber.

Claims (1)

[Scope of utility model registration request] 1. An electromagnetic coupling device comprising an armature, the outer peripheral portion of which is supported by a stopper plate, and which is magnetically attracted to an attracting surface of a rotor or a yoke by energizing an electromagnetic coil.
A rivet that is provided on the outer peripheral portion of the armature so as to bulge toward the stopper plate side, contacts the outer peripheral portion of the stopper plate with the bottom plate of the concave portion, and is fixed to the stopper plate and protrudes into the central portion of the concave portion. An electromagnetic coupling device, characterized in that a damper rubber is filled between the recess and the inner peripheral surface.