Patent ID: 7591215

Claim:
A hydraulic machine comprising: a housing; a cylinder block located in the housing and having pistons slidably movable in piston cylinders; a shaft rotationally connected to the cylinder block; a swash plate in load engagement with the pistons of the cylinder block, the swash plate being pivotally mounted in the housing such that said swash plate is pivotally adjustable about a kinematic axis to alter a hydraulic displacement of the pistons in the cylinder block, and; thrust pistons located between the swash plate and the housing so as to urge the swash plate toward the cylinder block, wherein the pivotal mounting of the swash plate in the housing comprises two swinging bearings coaxial with said kinematic axis, wherein said machine comprises first and second groups of thrust pistons located in cylindrical recesses in the swash plate, said recesses of the thrust pistons of said first group being hydraulically connected to each other, wherein a pre-stressed spring is mounted in the cylindrical recess between each of the thrust pistons and the swash plate.