MULTIROW RADIAL-PISTON HYDRAULIC MOTOR FOR REPEATED ACTION Russian patent published in 1994 - IPC

FIELD: gearless hydraulic rotary drive. SUBSTANCE: piston groups have pistons mounted in radial bores of cylinders. Cross-pieces are arranged in radial slots of the cylinder block for engagement with pistons and are provided with bearing rolls at the ends. Rolls are mounted for engagement with profiled guide by their cylindrical surfaces and with end guide surfaces of the cylinder block by their ends. Each piston is provided with cylindrical axial tail-piece whose diameter is less than diameter of the piston. Tail-piece is provided at the area where piston is engageable with the cross-piece. Guaranteed clearance is formed between end of the roll and generatrix of the respective tail-piece. End guides of cylinder block are made in planes crossing its radial bores. EFFECT: enhanced reliability. 2 cl, 5 dwg