JPH0425540Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention is primarily concerned with the improvement of electromagnetic clutches used for intermittent operation of automobile cooling compressors, particularly those of the type that use cushion rubber.

BACKGROUND ART Conventionally, as this type of electromagnetic clutch, the one shown in FIG. 2 has been generally used. The annular cushion rubber shown in the figure is interposed between the armature and the hub and relieves the impact load applied from the armature to the hub and onto the compressor, but the cushion rubber is attached to the armature and the hub because it is fixed to the cushion rubber. The inner and outer rubber retaining plates are caulked and fixed with multiple rivets.

Problems to be Solved by the Invention The above-mentioned prior art had disadvantages in that it required a rubber retaining plate and rivets for installation, which required a large number of parts, and the work of caulking with rivets was complicated and required much time for assembly.

Means for Solving the Problems The electromagnetic clutch of the present invention has the following configuration as a means for solving the above problems.

(1) A rotor that is rotationally driven by a drive source and an armature that forms a magnetic circuit of an excitation coil disposed inside the rotor are arranged opposite each other, and the armature is attracted to the friction surface of the rotor to generate rotational driving force. In the electromagnetic clutch for transmission, a cylindrical outer rising part is integrally formed on the outer periphery of the annular part that is attracted to the armature rotor, and a disc-shaped hub is connected to the rotating shaft of a driven device such as a compressor. A cylindrical inner rising portion is integrally formed on the outer periphery of the portion and faces the outer rising portion,
A separating piece such as paper is interposed between the inner surface of the annular portion of the armature and the disc-shaped portion of the hub, and cushion rubber is injected into the annular space between the outer rising portion and the inner rising portion. Molded and fixed together.

It is.

Function In the present invention, the circular outer surface of the annular cushion rubber is fixed to the outer rising part of the armature, and the circular inner surface is fixed to the inner rising part of the hub, but the flat part in contact with the armature is separated by paper or the like. Since there is a piece in between, it can slide freely against the armature. Therefore, when the armature generates an attractive force from the excitation coil and is attracted to the friction surface of the rotor, the cushion rubber responds by the shearing force along the inner and outer surfaces of the circular shape, and the shock is transmitted from the rotor to the driven equipment such as the compressor. Relieve the load.

Embodiment Figure 1 shows an example of the implementation of the present invention. 1 is a rotor with a pulley 2 screwed onto the outer periphery, an excitation coil 4 built in via a coil core 3, and a ball bearing 5 on the inner periphery. It is caulked and fixed. 6 is an oil scattering prevention cover that is fixed during caulking.
Reference numeral 7 designates an armature that is disposed opposite to the rotor 1 and forms a magnetic circuit for the excitation coil 4. Reference numeral 8 designates a hub that is connected to the rotating shaft of a driven device such as a compressor, and there is a space between the armature 7 and the armature 7. Piece 9 is interposed. A cylindrical outer rising portion 7a is integrally formed on the outer periphery of the armature 7, and a cylindrical inner rising portion 8a is integrally formed on the outer periphery of the hub 8. They are facing each other. 10 is a cushion rubber and the outer rising portion 7
a, the inner rising portion 8a, and the separating piece 9.

In the present invention, the cushion rubber 10 is fixed between the armature 7 and the hub 8, which can alleviate the impact load when the armature 7 is attracted to the friction surface of the rotor 1. Since no rubber retaining plate is used, the number of parts is small and the installation work is easy.

Effects of the invention (1) The cushion rubber is directly fixed to the armature and hub, and there is no need for a rubber retainer plate or rivets for installation as in the conventional case, so the number of parts is reduced and the installation work is easy.

(2) After inserting an isolation piece such as paper between the armature and the hub, cushion rubber is injected into the space between the outer rising part and the inner rising part, so that the flat part of the cushion rubber does not adhere to the armature. First, the elasticity of the cushion rubber is ensured.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one example of implementing the present invention;
The figure is a sectional view of a main part of a conventional example. The symbols in the drawings indicate the following members, respectively. 1... Rotor, 2... Pulley, 3... Coil core, 4... Excitation coil, 5... Ball bearing, 6... Oil scattering prevention cover, 7... Armature, 8... Hub, 7a... Outer riser Part, 8a...
...Inner rising portion, 9...Isolation piece, 10...Cushion rubber.

Claims (1)

[Scope of utility model registration request] An electromagnetic system that transmits rotational driving force by arranging a rotor that is rotationally driven by a drive source and an armature that forms a magnetic circuit of an excitation coil disposed inside the rotor and adhering the armature to the friction surface of the rotor. In the clutch, a cylindrical outer rising part is integrally formed on the outer periphery of the annular part that is attracted to the rotor of the armature, and a cylindrical outer rising part is integrally formed on the outer periphery of the disc-shaped part of the hub that is connected to the rotating shaft of a driven device such as a compressor. A cylindrical inner rising portion is integrally formed and faces the outer rising portion, and a separating piece such as paper is interposed between the inner surface of the annular portion of the armature and the disc-shaped portion of the hub. and an electromagnetic clutch formed by injecting and molding cushion rubber into an annular space surrounded by the outer rising portion, the inner rising portion, and the isolation piece and fixing them together.