JP2533764Y2 - Electromagnetic coupling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an electromagnetic coupling device for connecting and disconnecting transmission of rotational torque and braking of a rotating body by energizing and de-energizing an electromagnetic coil.

[Conventional technology]

2. Description of the Related Art Conventionally, an armature assembly of an electromagnetic clutch mounted on, for example, a refrigerant compressor or a mechanical supercharger as a vehicle cooling device is disclosed in, for example, Japanese Utility Model Publication No. 2-18821. It is configured as shown. That is, a stopper plate 2 formed in a circular plate shape is attached to a flange 1a of an armature hub 1 mounted on an input shaft of a compressor (not shown), and an outer peripheral portion of the stopper plate 2 is arranged in a circumferential direction. For example, damper covers 3 each having an L-shaped cross section are welded to three equally divided portions.

Reference numeral 4 denotes an armature formed in an annular plate shape. A small-diameter portion 6a of a rivet 6 in which a damper rubber 5 is fitted and fixed on the outer periphery is provided in a stepped hole 4a formed in a location corresponding to the damper cover 3. After passing through the hole 2 a of the stopper plate 2, it is fitted and fixed by caulking, and the damper rubber 5 is press-fitted and fixed to the inner peripheral surface of the damper cover 3.

Reference numeral 7 denotes a stopper rubber fitted to the rivet 6 and inserted between the armature 4 and the stopper plate 2. In the armature assembly configured as described above, the armature hub 1 is fitted and fixed to the input shaft on the compressor side, and the plane of the armature 4 rotates on the cylindrical portion of the compressor via a bearing. It is opposed to the suction surface of the freely fitted rotor.

With this configuration, when the electromagnetic coil provided in the yoke in the rotor is energized, the magnetic flux causes the armature 4 to be magnetically attracted to the attracting surface of the rotor. Is transmitted,
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, no suction noise is generated, and the shock due to the suction is reduced, so that a sudden rise in torque can be prevented. When the power supply to the electromagnetic coil is stopped in this state, the armature 4 is separated from the rotor by the restoring force of the damper rubber 5.

FIG. 3 is a longitudinal sectional view of an armature assembly incorporated in an electromagnetic coupling device disclosed in Japanese Patent Publication No. 2-2009, for example, in which a stopper plate 2 and a damper cover 3 are die-cast with aluminum. The other components are almost the same as those in the example shown in FIG.

FIG. 4 is a longitudinal sectional view of an armature assembly incorporated in an electromagnetic coupling device disclosed in, for example, Japanese Utility Model Publication No. 51-28525, in which a stopper plate 2 is provided with a flange 1a of an armature hub 1. And a dish-shaped outer member 2b attached to the armature 4 with a diameter larger than that of the inner member 2a and formed of the same dish-shaped outer member 2b. In the annular space 2c formed between the peripheral walls, a damper rubber 5 is fixed and filled on the inner surface of the peripheral wall. The end face 5a of the damper rubber 5 is formed lower than the opening end 2d of the space toward the armature 4 by the symbol L in the drawing, and the end face 5a of the damper rubber 5 has an inner peripheral portion 5b and an outer peripheral portion 5c. It is formed in an arc shape. 2e
Is a pressing member formed integrally with the inner member 2a and abutting against the armature 4 to apply an initial reaction force to the damper rubber 5.

With this configuration, FIG. 2 and FIG.
The operation is almost the same as that shown in the figure. In this case, since the inner peripheral portion 5b and the outer peripheral portion 5c of the damper rubber 5 are formed in an arc shape, no crack is generated at this portion.

[Problems to be solved by the invention]

However, among the armature assemblies in such a conventional electromagnetic coupling device, those shown in FIG. 2 are denoted by reference numerals A and B in the figure because stress is concentrated on the damper rubber 5 at the corners and end faces of the rivets 6. , C is likely to cause cracks in the damper rubber 5 at the locations indicated by C, and those shown in FIG.
However, there is a problem that cracks are easily generated.

On the other hand, the one shown in FIG. 4 has arc-shaped corners as shown by reference numerals 5b and 5c in the figure, so that cracks hardly occur,
The length of the holding portion formed by the inner and outer members 2a and 2b filled with the damper rubber 5 becomes longer than the length of the damper rubber 5 by the symbol L in the figure, and this is applied to FIGS. 2 and 3. Is a rivet 6 or a rivet 6 and a damper cover 3
However, since the damper rubber holding portion becomes longer, the entire device becomes longer in the axial direction, and there is a problem that the installation space of the device is increased.

The present invention has been made in view of the above points, and an object of the present invention is to provide an electromagnetic coupling device capable of eliminating a crack in a damper rubber and greatly reducing an axial dimension.

[Means for solving the problem]

In order to achieve such an object, according to the present invention, an electromagnetic coupling device having an armature whose outer peripheral portion is supported by a stopper plate and is magnetically attracted to an attracting surface of a rotor or a yoke by energizing an electromagnetic coil is provided. A through hole is formed in the outer peripheral portion, and a cup-shaped damper rubber holding body connected to the through hole and opened on the side opposite to the armature is provided, and a connecting pin erected on the armature is inserted into the damper rubber holding body, and both of them are inserted. Are connected via a damper rubber filled in a damper rubber holding body, and the distal end edge of the connection pin is formed in an arc shape so as to reduce the diameter, and the damper rubber is vulcanized and solidified on the connection pin including the arc portion. It is stuck.

[Action]

When the electromagnetic coil is energized while the rotor is rotating, power is transmitted by magnetically attracting the armature to the attracting surface of the rotor by the generated magnetic flux. At this time, the damper rubber elastically deforms to absorb the impact. So
No suction noise is generated, and the shock due to the suction is reduced, so that a sudden rise in torque can be prevented.

When the power to the electromagnetic coil is cut off from this state, the damper rubber is restored and the armature is separated from the rotor.

When the armature is magnetically attracted to or separated from the rotor, the distal end edge of the connecting pin to which the damper rubber is fixed is formed in an arc shape, so that no crack occurs and the axial length of the entire device is shortened.

〔Example〕

FIG. 1 is a longitudinal sectional view of an electromagnetic clutch for a compressor to which the electromagnetic coupling device according to the present invention is applied. In the figure, an electromagnetic clutch 11 includes a rotor 14 supported on a cylindrical projection 12a of a compressor 12 via a bearing 13 so as to freely rotate via a bearing 13, and a V-groove 14a formed on an outer peripheral portion of the rotor 14. A V-belt for drivingly connecting the engine and the rotor 14 is stretched between, for example, an engine-side V pulley (not shown).

In an annular groove 14b of the rotor 14, a yoke 16 in which an electromagnetic coil 15 is provided is fixedly fitted to the compressor 12 by a mounting plate 17, while a cylindrical projection 12a of the compressor 12 is provided.
The armature hub 20 and the stopper plate 21 of the armature assembly generally indicated by reference numeral 19 are provided on the input side 18 that is penetrated and is drivingly connected to the rotating part of the compressor 12 by the serration fitting part 22 and the bolt 23. Fixed.

The stopper plate 21 is formed in a plate shape such as a triangle or a circle, and is formed between the stopper plate 21 and the rotor 14 in a disk shape having a hole 24a having a larger diameter than the flange 20a of the armature hub 20. Armature 24 formed
Are supported by the stopper plate 21 and disposed.
A rivet 25 as a connecting pin is fixed by caulking at a position where the outer peripheral portion of the armature 24 is equally divided into a plurality of parts (three in this embodiment) in the circumferential direction.
Project through the through hole 21a provided in the stopper plate 21 toward the rotor 14 side.

And, on the outer peripheral portion of the stopper plate 21, a damper cover 26 serving as a cup-shaped damper rubber holding member opened on the opposite side to the armature 24 is welded to the stopper plate 21 so that the rivet 25 is positioned at the center, The annular space between the damper cover 26 and the rivet 25 is filled with a damper rubber 27 that has been vulcanized and solidified. And
In the present device, the opening-side end face of the damper cover 26, the tip end face of the rivet 25 and the end face of the damper rubber 27 are formed so as to be flush with each other. Also rivets
The peripheral edge of the tip of 25 is formed in an arc shape so as to reduce the diameter, and the damper rubber 27 is fixed to the rivet 25 including this arc portion by vulcanization and solidification. The arc-shaped portion is denoted by reference numeral 25a. Incidentally, 14c and 24b are demagnetizing holes for bypassing the magnetic flux.

The operation of the electromagnetic coupling device configured as described above will be described. When the electromagnetic coil 15 is energized while the rotor 14 is driven and rotated from the driving side, a magnetic flux passing through the yoke 16, the rotor 14, the armature 24, and the yoke 16 is generated. Since the power is transmitted by being attracted and the armature 24 rotates integrally with the rotor 14, the stopper plate 21 integrated with the armature 24 and the rivet 25, the damper cover 26 and the damper rubber 27 rotates, and this stopper plate is rotated. The input shaft 18 integrated with the armature 21 and the armature hub 20 rotates.

When the power supply to the electromagnetic coil 15 is stopped in this state, the armature 24 is separated from the suction surface of the rotor 14 and the input shaft 18 of the compressor 12 stops.

When magnetically attracting the armature 24, the damper rubber 27
The armature eliminates suction noise
The impact that occurs at the moment when the rotor 24 is attracted to the rotor 14 is reduced, and a sharp rise in torque can be prevented. Further, an arc-shaped portion 25a is formed on the periphery of the tip of the rivet 25. As a result, the damper rubber 2 in contact with the arc-shaped portion 25a is formed.
Since the inner peripheral surface of the end face 7 is also formed in an arc shape, stress does not concentrate here, cracks do not occur, and even if the arc-shaped portion 25a is provided, the symbol L in FIG. As shown, the holding portion of the damper rubber 27 does not become long in the axial direction.

In the embodiment shown in FIG. 1, by providing the damper cover integrally with the stopper plate 21 without providing the damper cover 26, the axial length of the entire apparatus can be further reduced.

Further, in the electromagnetic clutch 11 of the present embodiment, an example is shown in which the distal end edge of the rivet 25 as the connecting pin is formed in an arc shape, but it is more effective if the distal end edge of the damper cover 26 is formed in an arc shape. is there.

Furthermore, 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. Can be similarly applied.

[Effect of the invention]

As described above, the electromagnetic coupling device according to the present invention is an electromagnetic coupling device having an armature whose outer peripheral portion is supported by a stopper plate and magnetically attracted to an attracting surface of a rotor or a yoke by energizing an electromagnetic coil. A through-hole is formed in the outer periphery of the armature, and a cup-shaped damper rubber holding body connected to the through-hole and opened on the side opposite to the armature is provided, and a connecting pin set up on the armature is inserted into the damper rubber holding body. Both are connected via a damper rubber filled in a damper rubber holding body, and the distal end edge of the connection pin is formed in an arc shape so as to reduce the diameter, and the damper rubber is vulcanized and solidified on the connection pin including the arc portion. Since the end of the damper rubber is also formed in an arc shape, stress is not concentrated on the end of the damper rubber and cracks are not generated. Succoth it is, it is possible to shorten the axial dimension of the entire apparatus, it is effective can be reduced installation space of equipment the device is incorporated.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an electromagnetic clutch according to the present invention, and FIG.
FIGS. 3, 3 and 4 are longitudinal 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 ... Armature, 25 ... Rivet, 25a ... Arc-shaped part, 26 ... Damper cover, 27 ... Damper rubber.

Claims (1)

(57) [Scope of request for utility model registration] An electromagnetic coupling device having an armature (24) whose outer peripheral portion is supported by a stopper plate (21) and magnetically attracted to an attracting surface of a rotor or a yoke by energizing an electromagnetic coil. ), A through-hole (21a) is formed in the outer periphery thereof, and a cup-shaped damper rubber holder (26) connected to the through-hole and opened on the side opposite to the armature (24) is provided.
6) A connecting pin (25) erected on the armature (24) is inserted into the armature (24), and both are connected via a damper rubber (27) filled in a damper rubber holder (26). 25. An electromagnetic coupling device, wherein a peripheral edge of the tip of 25) is formed in an arc shape so as to reduce the diameter, and a damper rubber (27) is fixed to the connection pin (25) including the arc portion by vulcanization and solidification.