Patent ID: 6367368
Filing Date: 2002-04-09
Classification: F04B

Abstract:
A variable capacity swash plate type compressor comprising:a cylinder block having a plurality of cylinders arranged radially and circumferentially therein; a crankcase mounted adjacent said cylinder block and cooperating with said cylinder block to define a sealed crank chamber, said crankcase having a central axis and an inner wall with spaced apart longitudinally extending parallel bearing surfaces formed therein and extending parallel to said central axis of said crankcase, said bearing surfaces defining longitudinal recessed portions therebetween; a drive shaft rotatably supported by said crankcase and said cylinder block in said crank chamber; a swash plate slidably and rotatably disposed on said drive shaft; a plurality of pistons reciprocatively disposed in each of said cylinders of said cylinder block, each said piston having a longitudinal axis and an outer surface; means for achieving a hinged connection between said swash plate and each of said pistons so that when said drive shaft is rotated, each said piston reciprocates in a corresponding said cylinder; and an anti-rotation structure disposed on each said piston to reciprocatively move within said crankcase, said anti-rotation structure having two shoulder portions extending radially outward from said longitudinal axis of each said piston to a point beyond said outer surface of each said piston adjacent said bearing surfaces of the inner wall of said crankcase, said shoulder portions of said anti-rotation structure permitting said outer surface of each said piston to reciprocatively move adjacent an associated one of said recessed portions of said inner wall of said crankcase while preventing rotation of said pistons in said cylinders.