Hydrostatic machine with compensated sleeves
AssigneeBrueninghaus Hydromatik GmbH
InventorSteven Donders
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Abstract
A hydrostatic machine with a cylinder block (6), within which sleeve holes (28b) are arranged, in which sleeves (28) sit, surrounding piston bores (28a) in which pistons (29) are mounted, such as to be displaced back and forth and the pistons (29) extend into the cylinder block (5) such as to define cylinders (26) with the front ends thereof. According to the invention, the risk of piston seizure can be reduced, whereby the sleeves (28) comprise an axially-defined recess (41) in the outer surface thereof, in the region facing away from the cylinder and the region with the greatest piston radial force, pressing the pistons (29) against the wall of the piston bore.
Claims21
A hydrostatic machine with a cylinder block having sleeve holes formed therein, sleeves seated in said holes and surrounding piston bore, pistons being mounted in said bores for reciprocatory displacement, said pistons extending into the cylinder block so as to define cylinders at front ends thereof, the sleeves each, in a region facing away from the cylinder and at least in a region of a greatest piston radial force pressing the piston against a wall of the piston bore, have an axially-defined recess which is arranged in a region of the center of gravity of the piston in an outer surface thereof, and wherein a throughput volume of the hydrostatic machine is adjustable and the recess is positioned in the region of the center of gravity when the hydrostatic machine is adjusted to a minimum throughput volume.
A hydrostatic machine with a cylinder block having sleeve holes formed therein, sleeves seated in said holes and surrounding piston bores, pistons being mounted for reciprocatory displacement, said pistons extending into the cylinder block so as to define cylinders at front ends thereof, the sleeves in each instance including an axially-defined recess which is arranged in a region of a center of gravity of the piston in an inner surface thereof in a region facing away from the cylinder, wherein the recess in each instance is located at least in a region of a greatest piston radial force pressing the piston against a wall of the piston bore, and wherein a throughput volume of the hydrostatic machines is adjustable and the recess is positioned in the region of the center of gravity, when the hydrostatic machine is adjusted to a minimum throughput volume.
Dependencies are inferred from the claim text.