FIELD: metallurgy.
SUBSTANCE: piston assy comprises interconnected piston and rod, pipeline arranged with clearance in the rod lengthwise rod, pipeline with front end connected with the disc hollow stem, disc being arranged without clearance between ends of piston and rod and connected by stem with rod via thread and pin. Disc has crosswise openings open inside the stem cavity and into ring clearance there between. Crosswise openings are made in rod rear walls to extend in its lengthwise channel and bottom. Crosswise openings are made in rod front part to extend to lengthwise and ring channels with seal element connected by grooves with lateral ring clearance between disc and piston. Piston rear end has crosswise grooves to receive ledges at front end of sleeve fitted on the rod locked thereat. Rear end is locked by front end of nut-bush screwed on the rod.
EFFECT: higher reliability.
4 dwg
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