Balanced variable stroke axial piston machine

Claim 1

A variable stroke axial piston machine having a shaft, a swash plate centrally received on said shaft, means operatively connecting said swash plate to said shaft for rotation therewith and tilting relative thereto about an axis at right angles to and intersecting with the axis of said shaft, a wobble plate centrally received on said shaft and operatively contacting one side of said swash plate, means preventing said wobble plate from rotating so that said wobble plate is caused to wobble by operative contact with said one side of said swash plate on shaft rotation through an angle determined by that of said swash plate, a plurality of pistons spaced about and axially movable relative to said shaft in corresponding cylinders, a connecting rod connecting each said piston to said wobble plate, characterized by a balance disk centrally received on said shaft opposite the other side of said swash plate, means operatively connecting said balance disk to said shaft for rotation therewith and tilting relative thereto about an axis at right angles to and intersecting with the axis of said shaft at a point spaced from that of said swash plate, and two pair of contacting cam surfaces on said swash plate and balance disk located on opposite sides of their respective tilt axis for causing planes passing through the tilt axis and mass centroid of the respective swash plate and balance disk to be and remain parallel, said contacting cam surfaces having radii whose total equals the distance between the tilt axes of said swash plate and balance disk.