PISTON RING GROOVE FOR FLUOROCARBON SEAL RINGS

摘要

An air conditioning axial compressor having a double-acting piston and ring assembly arranged with a piston groove adjacent each piston head end. The piston groove configuration includes front and rear asymmetrically spaced, annular V-shaped ridges together with annular recesses at each radial side wall of the groove such that the groove receives a resilient fluorocarbon resin seal ring therein formed into an arcuate section upon being snapped into the groove and urged into place wherein the ring's inner peripheral surface is penetrated in a sealed manner by the ridges to compensate for any lack of concentricity between the groove and the piston. The front ridge is located closer to the groove medial transverse plane, thereby allowing the ring leading edge to be received into the groove front recess an amount sufficiently below the outer diameter of the piston to insure ready piloting of the piston heads into their associated aligned cylinder bores.