FIELD: piston unloading. SUBSTANCE: device for piston unloading has connecting rod, piston, support and hinged rolling bearings hinged with common axle so to form slide block. Connecting rod has slide block head with lengthwise slot that cover support bearing installed so to make contact with one of two plane guides for straight motion. The piston has a fork with outer holders of hinge bearings secured in openings of the fork. Connecting rod is connected to output shaft and as the latter moves, the former imparts reciprocation to the piston in working chamber to increase and decrease periodically its volume for pumping working fluid. EFFECT: simplified design and decreased size. 3 dwg
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