Stroke control assembly for a variable displacement compressor

摘要

An assembly for enhancing piston stroke control for a variable displacement wobble plate compressor having basic differential gas pressure control includes a non-rotary shaft mounted to provide translational axial movement in the housing of the compressor. A helical compression spring biases the shaft and non-rotary socket plate in an upstroke direction towards full piston stroke operation. The upstroking force provided by the spring acts to compliment the internal refrigerant gas pressure to provide for improved control and stability for piston stroking. The socket plate is driven to nutate by a journal pivotally mounted on a central drive hub. The control assembly further includes a set of ears with outer flats that mate with inner flats on cooperating flanges of the drive hub. Pivot pins extending perpendicular to the direction of piston travel connect the ears of the journal with the flanges of the drive hub. The flanges on the drive hub have kidney slots to assist in controlling the pivoting movement of the journal. The pivoting movement of the journal/socket plate assembly and the biasing action of the spring provides efficient upstroke and destroke control of the compressor pistons.