Importance

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Abstract

A variable displacement hydrostatic axial piston machine has a cylinder barrel which is rotatable in a yoke and has a plurality of circumferentially spaced cylinder bores in which are mounted pistons which with the ends of their associated piston rods are journalled in a drive disk on a machine shaft rotatably mounted in the casing of the machine. The yoke is mounted in said casing pivotable about a transfer axis through the drive disk center by means of an adjustment device for varying the displacement and possibly also the mode of the operation of the machine, in the yoke and the machine casing furthermore being disposed a pair of hydraulic fluid connecting conduits. For obtaining a lighter and more compact design of the machine the yoke is formed with a guiding segment instead of another leg, said segment being adapted to be moved in a curved guide path in the casing located in a plane perpendicular to the pivot axis of the yoke, one of the connecting conduits for hydraulic fluid to the cylinder barrel extending within said yoke leg while the other is formed by a hollow space in the machine casing, and the adjustment device comprises two cylinder bores in the yoke with adjustment pistons therein and an adjustment valve for selectively connecting one of said pair of adjustment cylinder bores with one of the hydraulic fluid conduits for adjusting the yoke.

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First Claim