Nippondenso Co., Ltd.

Juneichi Nakagawa

Masahiro Kinoshita

Hidetaka Shingai

Kimio Suzuma

Yutaka Ito

An electromagnetic clutch for a compressor in an air conditioning apparatus for an automobile. A temperature fuse unit 13 is arranged in an electric circuit for an electromagnetic coil of the clutch for opening the circuit when a temperature increase is generated due to an occurrence of seizing. The temperature fuse unit 13 is arranged in a coil housing 4 at a location adjacent a frictional surface 2a of a rotor of the clutch and an inner sleeve portion 4a of the coil housing 4. During normal operation of the clutch, heat around the electromagnetic coil is transmitted to the coil housing of an increased heat conductivity, made of a magnetizing metal materials, thereby preventing the temperature around the temperature fuse 13 from being increased. At an occurrence of seizing of the compressor, heat generated by a sliding contact between an armature 8 and rotor 2 is quickly transmitted to the temperature fuse 13 via an end of the inner sleeve portion 4b of the coil housing 4, which allows the temperature fuse to be instantly melted and thus opened.

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Nagoya, Japan

Juneichi Nakagawa