FIELD: machine engineering.
SUBSTANCE: crank mechanism has rectangular pistons with elastic elements located on inner side of rectangular sections of compression and oil-scraper seals, which tips are aligned with clearance in longitudinal direction.
EFFECT: enlarged capabilities of piston machine and pumping unit due to increased packing density The rectangular shape of the pistons and guides excludes large clearances between cylinders of the crank mechanism of conventional arrangement.
7 dwg
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