JPH043132Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an electromagnetic clutch used for continuous power transmission.The application is not particularly limited, but it can be used, for example, in a compressor for a car cooler. suitable.

[Conventional technology]

Conventionally, this type of electromagnetic clutch has a rotor and an armature, and the electromagnetic clutch is connected or disconnected by turning on and off the energization of an excitation coil that is integrally provided with the rotor, and connecting and separating the rotor and armature. It was intended to be carried out.

The inventors of the present invention have already installed an annular rubber plate on the armature and a compressor shaft to absorb the rotational power of the armature, in order to buffer the impact of the contact and separation between the rotor and the armature, and especially to reduce the operating noise when the rotor and armature are connected. We are proposing a structure that is clamped and fixed with rivets between the inner hub and the inner hub.

[Problem that the invention attempts to solve]

However, the electromagnetic clutch with the above structure has separate rubber plates sandwiched between them, and its structure blocks the escape route for oil flowing out from the compressor, resulting in problems such as oil adhering to the friction surfaces. There is a problem that causes

Furthermore, the rubber plate needs to be fixed to the armature with a relatively strong adhesive such as a chloroprene-based adhesive, but the high speed rotation of the electromagnetic clutch applies a large centrifugal force to the rubber plate, so the rubber plate has to be fixed to the armature for a long time. There is a problem in that over time, the adhesive surface with the armature may peel off and the rubber plate may fall off.

[Means for solving problems]

In the present invention, protrusions and grooves are alternately formed integrally with the rubber member between the armature and the rubber member that connects the inner hub that transmits rotation to the rotating shaft and the hub plate that is connected to the armature. These are formed on the radial side and the inner radial side.

[Effect]

The protrusion formed on the outer diameter of the rubber member is sandwiched between the armature and the hub plate, so it can absorb the shock at startup and reduce operating noise, and a groove is formed on the armature. This allows oil to be discharged and prevents oil from adhering to friction surfaces.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention shown in the drawings will be described. FIG. 1 is a longitudinal cross-sectional view showing the structure of an embodiment in which the present invention is applied to an electromagnetic clutch for a car cooler compressor.
This is a yoke that stores magnetic materials, and is made of magnetic iron material formed into a ring shape with a U-shaped cross section. A resin molding frame 3 made of epoxy resin or the like is disposed between the yoke 2 and the coil 1 to fix and hold the coil 1 without contacting the yoke 2. A rotor 4 is made of iron, which is a magnetic material, and is disposed so as to fit with the outer and inner surfaces of the yoke 2 with a small gap therebetween. The inner diameter part of this rotor 4 is rotatably attached to a cylindrical protrusion 6 of the compressor housing via a bearing 5, and the outer diameter part is formed with a pulley groove 7 that engages with a V-belt (not shown). . Therefore, the rotor 4 receives the driving force of a vehicle engine (not shown) through the V-belt to rotate. Note that 8 is a circlip that holds and fixes the inner race of the bearing 5 to the cylindrical protrusion 6 of the housing. A ring-shaped armature 9 faces the side surface of the rotor 4 with a slight gap therebetween, and is made of iron, which is a magnetic material. Rubber member 1
0 is a hub plate 12 connected to an armature 9 by a rivet 11, and a compressor shaft 1.
The inner hub 13 is connected to the inner hub 8 by bolts. FIG. 2 is a schematic view of the hub plate 12 shown in FIG. 1 with the armature 9 and rivets 11 removed and seen from the arrow A direction. 10, and projections 16 and grooves 17 are alternately formed integrally with the rubber member 10 on the outer diameter side. Then, the protrusion 16 on the outer diameter side
is sandwiched between the hub plate 12 and the armature 9 and serves to reduce operating noise, and the grooves 15 and 17 serve to drain compressor oil.

The operation in the above configuration will be explained. When the excitation coil 1 is energized, the armature 9 is attracted to the rotor 4. The armature 9 has an L-shaped hub plate 12,
It is connected to the compressor shaft 18 via the rubber member 10 and the inner hub 13, and since the rotor 4 is constantly rotated by a driving source such as an engine, the above-mentioned adsorption of the armature 9 to the rotor 4 causes The compressor is driven. The impact caused by the connection between the rotor 4 and the armature 9 at the time of startup is absorbed by the protrusion 16 on the outer diameter side of the rubber member 10, and the contact noise caused by the impact is greatly reduced. The protrusion 14 on the inner diameter side of the rubber member 10 contacts the armature 9 when the current is turned off, and the armature 9
The rubber member 10 is moved closer to the friction surface than in the free state, thereby deforming the rubber member 10 and increasing the spring force.
Note that this protrusion 14 is separated from the armature 9 when the current is on. In addition, the protrusions 14 and 16
The grooves 15 and 17 provided side by side have a gap with the armature 9 and serve as an oil flow path regardless of whether the current is on or off.

〔Effect of the invention〕

In the electromagnetic clutch of the present invention, the rubber protrusion for reducing operating noise is integrated with the rubber member, which reduces the number of parts and reduces costs.At the same time, an oil flow path is provided to reduce oil discharge. It has great effects such as being able to prevent oil from adhering to the friction surface of the scale.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing the construction of an embodiment of the electromagnetic clutch according to the present invention, and FIG. 2 is a schematic view of the hub plate shown in FIG. 1, with the armature and rivets removed, as seen from the direction of arrow A. 1... Excitation coil, 4... Rotor, 9... Armature, 10... Rubber member, 14, 16... Projection, 15, 17... Groove, 13... Inner hub, 1
2...Hub plate, 18...Complete suspension shaft.

Claims (1)

[Scope of utility model registration request] A rotor that is rotatably supported by a housing and rotates by receiving rotational force from an external drive source, an armature that is disposed opposite to the rotor so as to be able to come into contact with and separate from the rotor, and when energized, the armature is connected to the rotor. an excitation coil that is attracted to the armature; an inner hub that is fixed to the armature and rotates together with the armature to transmit rotation to the rotating shaft; and a hub plate that is coupled to the inner hub and the armature, and that is opposed to the armature. An electromagnetic clutch comprising a rubber member, characterized in that protrusions and grooves are alternately formed on the outer diameter side and the inner diameter side of the surface of the rubber member facing the armature.