Fluid pressure machines
AssigneeSauer United Kingdom Limited
InventorsAlan Cameron-Johnson, Michael J. Miles
Life of this patent
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Abstract
A fluid pressure machine such as a motor or pump has an orbiting cylinder block (9) housing a number of radial pistons (11) sliding within respective cylinders (10). Each piston has a cylindrical coaxial bore in which a fluid displacing member (13) fixed to the cylinder block is located so as to define within the cylinder an annular outer chamber (14) and an inner chamber (15). A selectively operable spool valve (36) is arranged for supplying hydraulic fluid under pressure to the inner and/or the outer chamber and thereby control the operating speed of the machine.
Claims6
A fluid pressure machine comprising a number of cylinders (10) arranged radially in a cylinder block (9) which is mounted for orbital non-rotational movement within a housing (1), pistons (11) which are slidable within the cylinders and in sliding contact with abutment faces (44) within the housing, and a rotatable shaft (4) having an eccentric (7) upon which the cylinder block (9) is journalled,
- characterised in that
- each piston (11) has a cylindrical axial bore (12), open at its radially inner end, in which a fluid displacing member (13), fixed relative to the cylinder block (9), is located, so that the piston (11) defines within the cylinder (10) an annular outer chamber (14) between the cylinder wall and the displacing member (13), and an inner chamber (15) within the piston bore, and in that selectively operable valve means (36) are provided for supplying fluid under pressure to the inner and/or the outer chamber to control the operating speed or torque of the machine.
Dependencies are inferred from the claim text.