FIELD: machine building.
SUBSTANCE: piston machine comprises cylinder-and-piston set including piston with compression rings fitted in its grooves and two bushes fitted in piston sidewall recesses as structural assemblies to orient ring locks. Said bushes are arranged above second compression ring in symmetry about its lock center at spacing between edges of recesses not exceeding preset maximum tolerance. Every said structural assy features limited displacement and is composed of a roller to enter holder top (annular) part with oil clearance and to slide between bottom holder end ledges, bottom holder being composed of segmented groove milled-out in piston body. Taper angles of top and bottom grooves in compression ring locks differ.
EFFECT: higher operating performances.
3 cl, 5 dwg
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