Importance

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Abstract

A variable displacement compressor having a rotary drive shaft coupled to a gas pressure positioned wobble plate carried by a drive mechanism including a drive journal and journal sleeve on the rotary drive shaft and a drive lug connected to the drive shaft having a slot operatively connected by a coupling pin to the journal. Thrust bearings located in the cylinder head and front head of the compressor axially position the drive mechanism within a gas pressured crankcase. The rear thrust bearing includes a race engaged by a coil spring on the shaft to provide relative axial movement between the shaft and the rear thrust bearing to compensate for end play between the thrust shoulders and the thrust bearings following assembly of the cylinder head and front head. The coil spring has a first predetermined biasing force when the wobble plate is in a full stroke position to maintain a minimum spring load on the thrust bearings to reduce wear during operation of the compressor at high air conditioning loads and the coil spring is shifted into a compressed position to provide an increased load on the thrust bearings in a direction to resist load reversals on the shaft when the compressor is operating under low air conditioning load conditions.

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First Claim