Denso Corporation

Yusuke Sakurai

Toshihiro Hayashi

Tsuyoshi Takemoto

Haruo Kamiya

Kimihiko Sato

In a scroll type compressor, the center and outer periphery portions of the spiral elements are provided with relief for preventing the mutual contact of the spiral elements. Both of the spiral elements come to contact with each other at the intermediate portion thereof. The relief at the center portion is formed within the range defined by the winding angle Y&equals;32(X&minus;1) where X is the winding turn of each of the spiral elements. The range of the intermediate portion is 380&deg;. This construction serves to prevent the excessive pressure increase of the operation chamber at the center portion so that the brake down of the spiral elements may be prevented without lowering the efficiency of the compressor.

Scroll type compressor

An electromagnetic clutch for use with a compressor for an automobile air conditioning system includes a back cover provided at an end wall (26) of an armature (15) which moves to engage and disengage a rotor. The back cover has visored slits (30) with visors (30a) which align with arcuate slots (24) of an armature (28). The air between the armature and the rotor is released through the slits to prevent over compression of the air when the armature is attracted to the rotor. The visor of the back cover prevents an oil leaking from the compressor from invading into the contacting surfaces of the clutch through the arcuate slots of the armature (15).

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Nagoya, Japan

Yusuke Sakurai