PISTON SHOES OF HYDRAULIC MOTOR AND PUMP

摘要

PURPOSE: Piston shoes of a hydraulic motor and a pump are provided to prevent breakage of the piston shoe by dispersing force acting on the inner spherical surface of the piston shoe, using hydraulic pressure of a pressure-compensated chamber and to block separation of a piston ball followed by deformation and breakage of a swaging part by reinforcing the swaging part. CONSTITUTION: Piston shoes of a hydraulic motor and a pump are combined to a piston ball(15) and the piston shoes drive a driving shaft while rotating toward the lower side of a swash plate when a piston advances. A pressure-compensated chamber(20) is formed by cutting the inner spherical surface coming in contact with the outer spherical surface of the piston ball. A swaging part(17-1) is formed with bigger diameter of 10¯15% than the diameter of the neck part.