JPH0115932Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an armature used in an electromagnetic coupling device such as an electromagnetic clutch, an electromagnetic brake, or an electromagnetic clutch/brake.

As an armature in an electromagnetic coupling device,
For example, an overlapping armature disk of an electromagnetic clutch is known, as described in US Pat. No. 3,586,145. The armature assembly described here consists of several thin disks, and even if the armature generates vibrations during operation,
A damping effect is obtained by sliding adjacent disks. In this way, by providing the armature itself with a vibration absorption function, when the armature is magnetically attracted to a rotating member or a fixed member by the magnetic flux of the electromagnetic coil, unpleasant squeaks (commonly known as squealing sounds) due to sudden coupling are avoided. can be prevented from occurring.

However, if the armature is made up of several thin disks stacked one on top of the other, this armature is configured as part of the magnetic flux circuit, so the problem is that the magnetic resistance in the magnetic flux circuit increases due to the gap between the stacked parts. There is a point.

This invention solves these problems and provides an armature for an electromagnetic coupling device that can reliably avoid the generation of the above-mentioned squeak noise.It has a sandwich structure with an elastic material layer, and this elastic material layer has a cushioning effect. It is unique in that it prevents the generation of unpleasant squeaks.

Next, the armature of this invention will be explained by way of example with reference to the drawings.

FIG. 1 shows the armature of this invention in a rear view, FIG. 2 shows a cross-sectional view taken along the line of FIG. 1, and FIG. 3 shows a cross-sectional view taken along the line of FIG.
FIG. 4 shows an example of the state of use in a longitudinal sectional side view. As shown in the drawing, the armature A of this invention includes an annular plate-shaped main body 1 made of a magnetic material, and a back plate 3 facing the input pulley 2 side as an armature support member.
and a rubber layer 4 as an elastic material layer interposed between the main body 1 and the back plate 3, forming a sandwich structure.

The back plate 3 is made of a rigid magnetic material, for example, mild steel, and has a ring plate shape.

The main body 1 and the back plate 3 are provided with two rows of arcuate holes 5A and 5B on the inner and outer sides which are concentrically arranged and arranged intermittently in the circumferential direction.
is provided. These arcuate holes 5A, 5B serve as magnetism-interrupting portions for detouring magnetic flux, and when the rubber layer 4 is vulcanized between the main body 1 and the back plate 3, a portion of the rubber layer 4 enters therein.

On the other hand, the back plate 3 is provided with rivet insertion holes 6 at six equally angularly divided positions, and rivets 8 for fixing one end of the torque transmitting/returning leaf spring 7 are inserted into these rivet insertion holes.

One end of the leaf spring 7 is fixed to the back plate 3 by a rivet 8, and the other end of the leaf spring 7 is fixed to the input pulley 2 by a rivet 9.

Since the rivet 9 has a head 9A protruding toward the armature A, the armature A is provided with holes 10 each having a larger diameter than the head 9A at six equal angular division positions.

The electromagnetic clutch shown in FIG. 4 as an example of an electromagnetic coupling device using the armature A of this invention has the input pulley 2 and the output pulley 11 attached to the boss portion 12A of the mounting plate 12 to the device B, and bearings 13 and 13, respectively. , 14 so as to be freely rotatable, and the spacer 15 is fitted onto the boss portion 12A.
A predetermined distance m is maintained by a gap adjustment shim 15', and the two are arranged on the same axis.

The armature A of this invention, which exists between the input pulley 2 and the output pulley 11 facing each other at the interval m, is built in an annular field core 16 facing into the annular groove 11A on the back side of the output pulley 11. By applying a voltage to the electromagnetic coil 17, the electromagnetic coil 17 is excited and magnetically attracted to the output pulley 11.

The output pulley 11 has arcuate holes 18A, 18 disposed intermittently in the circumferential direction at positions that do not directly face the arcuate holes 5A, 5B of the armature A.
B, 18c are formed in a concentric arrangement.

An input shaft 19 protruding from device B is connected to an input pulley 2 via a dish-shaped joint 20.

The connection between the input shaft 19 and the joint 20 is the connection between the input shaft 19 and the joint 20.
The hexagonal piece 21 fixed to the boss part 20A of the joint 20
slidably fit into the hexagonal hole 22 of the joint 20,
This is a connection that allows rotation and axial movement together with the input shaft 19.

The coupling between the joint 20 and the input pulley 2 is achieved by inserting bolts 24 and nuts 2 into bolt through holes 23 provided in the input pulley 2 at three equal angular division positions in the circumferential direction.
5A and 25B, and the input pulley 2 is provided with screw holes 26 in which bolts 24 are screwed at three equal angular division positions.

The device B is, for example, a walk pump, a generator, an alternator, etc. attached to an automobile engine, and the input pulley 2 is connected to a crank pulley by a belt. Also, output pulley 1
1 is a belt that is hung across the input pulley of a car cooler compressor.

Since the armature A of this invention has the above-mentioned configuration, when the rubber layer 4 is magnetically attracted to the output pulley 11, the rubber layer 4 is bent and the vibration-like movement seen in the conventional armature made entirely of a rigid material is avoided. Absorb.

In other words, conventional armatures attempt to strongly magnetically attract the magnet, but if the load is large, the magnet cannot be attracted immediately, and the output rotating member must repeatedly engage and disengage until the output rotating member rotates integrally with the input rotating member. This caused a vibration-like movement and caused a squeaking sound.
Now, when the main body 1 is strongly magnetically attracted, the rubber layer 4
is slightly deformed to prevent vibration-like movements from occurring, eliminating any squeaks.

As an example of use, the state of use in an electromagnetic clutch is shown, but it goes without saying that it can also be used in an electromagnetic brake in which an armature is magnetically attracted to a fixing member.

As is clear from the above explanation, the armature of this invention has a sandwich structure consisting of the main body, back plate, and elastic material layer, which eliminates the generation of squeak noise (commonly known as squealing noise). Since the structure is such that a load is applied to the leaf spring supported by the armature support member through the elastic material layer, it has excellent advantages such as being able to alleviate the sudden load applied to the leaf spring.

[Brief explanation of the drawing]

Fig. 1 is a rear view showing an embodiment of the armature of this invention, Fig. 2 is a sectional view taken from Fig. 1, Fig. 3 is a sectional view taken from Fig. 1, and Fig. 4 is an example of a state of use. FIG. In the drawings, A...the armature of this invention, 1...the main body,
2... Input pulley, 3... Back plate, 4... Rubber layer as an elastic material layer, 5A, 5B... Arc-shaped hole, 6...
Rivet insertion hole, 10... hole.

Claims (1)

[Scope of utility model registration request] The armature includes an armature supported by a leaf spring on an armature support member, and a field core containing a built-in electromagnetic coil that generates magnetic flux, which configures the armature as part of a magnetic flux circuit. In an armature for an electromagnetic coupling device that is magnetically attracted to a rotating member or a fixed member, the armature includes a ring plate-shaped main body made of a magnetic material, a ring plate-shaped back plate made of a rigid material facing the armature support member side, and the main body and the back plate. It has a sanderch structure with an elastic material layer interposed between the
An armature for an electromagnetic coupling device, characterized in that the main body is configured as a part of the magnetic flux circuit, and one end of the leaf spring is fixed to the back plate.