Radial-piston unit with a piston shoe between the piston and the eccentric lifting surface of the shaft

摘要

In a radial piston unit of the type in which fluid flows through the unit, in particular motors, in which a piston shoe pivotable in a pivoting bed in the piston is present between a piston moved backwards and forwards in a cylinder and the piston lifting surface, which is cylindrical but eccentric to the axis of the shaft, means are arranged which improve the support for the piston and the piston shoe in order to make the running of the piston and of the piston shoe proceed with less friction and to achieve maximum efficiency by achieving the greatest possible piston stroke for the smallest diameter of the piston lifting surface on which the piston shoe slides. This gives piston shoes with running surfaces on two piston lifting surfaces separated by a recess between two eccentrics of the shaft and furthermore gives pistons with piston arms entering the recess between the two eccentrics. Specially dimensioned and positioned pressure-fluid pockets and grooves, bearing surfaces in the pistons and piston shoes and specially positioned valves give an additional increase in the efficiency of the unit. <IMAGE>