Distribution system for a hydrostatic piston machine

Abstract

A distribution system for a hydrostatic piston machine comprising a rotating body with cylindrical chambers in which pistons are slideable, that are arranged parallel and concentrically with respect to the rotation axis of the body and are connected to respective ports distributed concentrically around the axis on a face of the body. A stationary plate of the system has a surface which makes contact against the body face and has two openings connected to a first and a second fluid duct, the openings being arranged concentrically with respect to the axis and opposite with respect to the ports, to form a passage section for the fluid between one of the chambers and one of the ducts. The openings and the ports are sized so that at the dead center of the stroke of the pistons the incremental ratio between the passage section of the fluid and the rotation angle of the body is different from zero.

1 . A distribution system for a hydrostatic machine provided with pistons, comprising: a rotating body provided with cylindrical chambers in which said pistons are slideable and which are arranged parallel and concentrically with respect to a rotation axis of said body; respective ports connected to said chambers and which are distributed concentrically around said axis on a face of said body; a stationary plate which has a surface which makes contact against said body face and is provided with two openings; a first duct and a second duct for a working fluid, said openings being connected to said openings and being arranged concentrically with respect to said axis and opposite with respect to said ports, so as to form a passage section for said fluid between one of said chambers and one of said ducts; and wherein said openings and said ports are sized so that at a dead center of a stroke of the pistons an incremental ratio between a passage section of the fluid and a rotation angle of said body is different from zero.  
   
   
       2 . The system of  claim 1 , wherein said openings and said ports are shaped like an annular segment which is formed by two opposite, inner and outer edges which are concentric with respect to said axis and are joined at opposite ends thereof by two further edges which have a radial orientation, and wherein the inner and outer edges of said openings are joined at opposite ends thereof by the further edges that are shaped complementarily to the further edges that join the outer and inner edges of said ports, said ports having a circular extension which is substantially equal to an arc portion that lies between said openings so that during the rotation of said body said ports are interposed exactly between said openings.  
   
   
       3 . The system of  claim 2 , wherein said further edges that join at the opposite ends the concentric opposite, inner and outer edges of said openings and ports are radial and straight.  
   
   
       4 . The system of  claim 2 , wherein the further edges that connect at the ends the concentric opposite, inner and outer edges of the ports and of the openings are formed by circular arcs which are mutually complementary, so that a shape of the ports is substantially identical to a shape of the arc portions comprised between the adjacent ends of the openings.