Hydraulic transformer
AssigneeBosch Rexroth AG
InventorRudolf Schaeffer
Life of this patent
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Abstract
What is disclosed is a hydraulic transformer wherein a multiplicity of displacers are guided in a displacement member. The stroke of the displacers is determined through the intermediary of a cam element, with pressure medium supply and discharge being controlled through the intermediary of a control member having a least three control grooves. In accordance with the invention either the displacement member or the cam element or the control member may be driven, whereas—depending on which component is driven—the cam element or the displacement member is mounted so as to be freely adjustable, and the remaining third component is accommodated integral with the housing.
Claims7
A hydraulic transformer comprising a multiplicity of displacers (6, 30) guided in a displacement member (2, 28), delimiting a variable displacer volume, and supported on a cam element (10, 32), wherein die pressure medium supply and discharge are controllable with the aid of a control member (20, 36) comprising at least three control kidneys (16, 17, 18) that are connected with a work port (A), a supply port (P), and a tank port (T), respectively, characterized in that from among the components displacement member (2, 28), cam element (10, 32) and control member (20, 36), one is capable of being rotatingly driven with the aid of a drive mechanism (22), whereas the second component with the exception of said control member (20, 36) is capable of being rotated as a result of the reaction forces, and the third component with the exception of said cam member (2, 28) is fixedly mounted in a housing of said hydraulic transformer (1).
The hydraulic transformer in accordance with any one of the preceding claims, wherein a rotational speed control is associated to said drive mechanism (22).
The hydraulic transformer in accordance with any one of the preceding claims, wherein it is realized in axial piston design and said control member is a valve plate (20), said cam element is a swash or wobble plate (10), and said displacement member is a drum (2) with displacers (6).
Dependencies are inferred from the claim text.