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US 5,295,038 AGranted
Electromagnetic clutch
AssigneeSanden Corporation
InventorsTakashi Matsushita, Yoshitaka Sunaga, Kouki Yoshizawa, Seiichi Hoshino
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AssigneeSanden Corporation
InventorsTakashi Matsushita, Yoshitaka Sunaga, Kouki Yoshizawa, Seiichi Hoshino
Estimating the term…
An electromagnetic clutch assembly for use with a refrigerant compressor for an automotive air-conditioning system includes a first rotatable member, such as a rotor, having an axial end plate of magnetic material and a second rotatable member connected to an outer end of a drive shaft of the compressor. An armature plate of magnetic material is elastically connected to the second rotatable member. The armature plate faces the axial end plate of the rotor with an axial air gap therebetween. An electromagnetic device is disposed within the rotor and is operable to attract the armature plate into contact with the axial end surface of the rotor such that the rotation of the rotor can be transmitted to the drive shaft when the electromagnetic device is activated. The electromagnetic device includes at least first and second electromagnetic coils which are axially aligned so as to generate a thermal difference therebetween when heat is conducted to the electromagnetic device from a contact surface between the axial end plate of the rotor and the armature plate. The first and second coils are connected in series between the battery and ground. A control device controls the connection and disconnection of the electromagnetic device to the battery. The control device disconnects the electromagnetic device to the battery when the thermal difference exceeds a predetermined value while the electromagnetic device is activated.
In an electromagnetic clutch assembly including a first member rotatable about an axis and having an axial end plate of magnetic material, a second member rotatable about said axis, an armature plate of magnetic material flexibly coupled to said second rotatable member so that said armature plate is capable of limited movement along said axis, said armature plate facing said axial end plate of said first rotatable member with an axial air gap therebetween, and an electromagnetic device associated with said first rotatable member of attracting said armature plate into contact with said axial end plate such that the rotation of said first rotatable member can be transmitted to said second rotatable member through said armature plate when said electromagnetic device is activated, the improvement comprising:
Dependencies are inferred from the claim text.