FIELD: machine engineering, possibly sealing of piston-cylinder pairs of internal combustion engines. SUBSTANCE: device includes cylinder-piston pair, upper compression slit ring having two layers fixed by means of cylindrical pins mounted in end of piston; lower compression slit ring arranged in groove of piston; oil slit ring. Lower layer of upper compression slit ring consists of two rings, one inside another. Upper layer of upper compression slit ring is in the form of single ring. Lower compression slit ring is fixed to piston by means of shaped dowel. Oil slit ring is fixed to piston by means of brace. EFFECT: enhanced operational reliability, increased useful life period of sealing device. 6 dwg
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