Adjustable hydrostatic pump with additional pressure change control unit
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United States of America Patent
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-
Nov 9, 1999
Grant Date -
N/A
app pub date -
Jul 8, 1997
filing date -
Feb 9, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An adjustable hydrostatic pump (10), in particular a piston pump, is proposed, whose cam ring (22) is adjustable via a hydromechanical adjusting assembly (35) and which has a device for active noise abatement. A pressure chamber (39) of a adjusting piston (37) acting upon the cam ring (22) is acted upon by pressure changes, via an additional control unit (47) parallel to the hydromechanical pressure controller (41), in such a way that the oscillating actions of power-train forces on the hydraulic fastening of the cam ring (22) are reduced, thus lessening the noise produced by the piston pump.
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