Hydraulic pump assembly
AssigneeBorgWarner Sweden AB
InventorsGustaf Lagunoff, Axel Wallgren, Gunnar Jonesand, Bo Lundström
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Abstract
A hydraulic pump assembly comprises a rotatable piston drum (20) with at least one centrifugal lever (23) pivotally attached thereto for radial movements between radial flanges (20′) under the action of centrifugal force at rotation of the piston drum. The centrifugal lever (23) is arranged to control the position of a valve member, preferably a ball (22), at the opening end of a bore (21) in the piston drum (20). There is a defined friction surface (28; 32) between the lever (23) and one of the radial flanges (20′), and there are spring means (29-31; 25, 33) for resiliently biasing the lever against said one of the flanges.
Claims4
A hydraulic pump assembly, comprising a rotatable piston drum with at least one centrifugal lever pivotally attached thereto for radial movements between radial flanges under the action of centrifugal force at rotation of the piston drum, the centrifugal lever being arranged to control the position of a valve member, at the opening end of a bore in the piston drum, a defined friction surface between the lever and one of the radial flanges, and a spring means for resiliently applying an axial force acting on a surface located between the axial extents of the lever biasing the lever against said one of the radial flanges.
A hydraulic pump assembly, comprising a rotatable piston drum with at least one centrifugal lever pivotally attached thereto for radial movements between radial flanges under the action of centrifugal force at rotation of the piston drum, the centrifugal lever being arranged to control the position of a valve member, at the opening end of a bore in the piston drum, a defined friction surface between the lever and one of the radial flanges and by spring means for resiliently biasing the lever against said one of the flanges, wherein a compression spring placed in an axial bore in the lever is arranged to push a ball against the other radial flange.
Dependencies are inferred from the claim text.