Rotating fluid machine

Abstract

An expander includes a rotor rotatably supported by a casing, a group of axial pistons and cylinders installed so that its axis is surrounded by the rotor, and a swash plate having a rotating surface inclined with respect to the axis of the rotor and is rotatably supported by the casing. The relative rotation of the swash plate and the rotor around the axis is restricted and the relative shifting of the swash plate and rotor in the direction of the axis is allowed, by fitting a slider, fixed to the swash plate by a synchro-pin, into a long hole of an output shaft. Therefore, it is possible to prevent wrenching between the swash plate and the rotor due to thermal expansion while reducing the bending moment acting on the pistons of the group of axial pistons and cylinders of the expander.

1 . A rotating fluid machine comprising a rotor supported rotatably by a casing, a group of axial pistons and cylinders disposed on the rotor so as to surround its axis, a swash plate having a rotating surface inclined relative to the axis of the rotor and is supported rotatably by the casing, connecting rods for linking the pistons of the group of axial pistons and cylinders to the swash plate, and linking means for linking the swash plate to the rotor, wherein said linking means restricts the rotation of the swash plate and the rotor relative to each other around the axis and permits the movements of the swash plate and the rotor relative to each other in the axial direction.  
     
     
         2 . The rotating fluid machine according to  claim 1 , wherein said linking means is arranged within the rotating surface of the swash plate which passes the intersection point between the axis of the rotor and the axis of the swash plate and is orthogonal to the axis of the swash plate.  
     
     
         3 . The rotating fluid machine according to  claim 1 , wherein a plurality of said linking means are arranged.  
     
     
         4 . The rotating fluid machine according to  claim 3 , wherein said plurality of linking means are radially arranged within the rotating surface of the swash plate which is orthogonal to the axis of the swash plate.  
     
     
         5 . The rotating fluid machine according to  claim 1 , wherein pivotal portions of the connecting rods on the swash plate side are offset by a prescribed distance toward the piston side of the swash plate in the axial direction with respect to the rotating surface of the swash plate which passes the intersection point between the axis of the rotor and the axis of the swash plate and is orthogonal to the axis of the swash plate.  
     
     
         6 . A rotating fluid machine comprising a rotor supported rotatably by a casing, a group of axial pistons and cylinders disposed on the rotor so as to surround its axis, a swash plate having an axis inclined relative to the axis of the rotor and is supported rotatably by the casing, connecting rods for linking the pistons of the group of axial pistons and cylinders to the swash plate via pivotal portions of the pistons, and linking means for linking the swash plate to the rotor, wherein the pivotal portions of the connecting rods on the swash plate side are offset by a prescribed distance toward the piston side of the swash plate in the axial direction with respect to the rotating surface of the swash plate which passes the intersection point between the axis of the rotor and the axis of the swash plate and is orthogonal to the axis of the swash plate.