Patent ID: 7243492
Filing Date: 2007-07-17
Classification: F04B

Abstract:
1. A tilting controller for a variable displacement hydraulic pump, including a variable displacement hydraulic pump having a volume varying portion in association with a rotational shaft rotationally driven by a drive source, tilting actuators adapted to be applied with a tilting control pressure for driving said volume varying portion of said hydraulic pump into a tilted position, a regulator in the form of a servo valve having a spool within a control sleeve for generating said tilting control pressure to be fed to and from said tilting actuators according to a command signal from outside, and a feedback mechanism adapted to follow tilting motions of said volume varying portion to feed back said control sleeve of said regulator, characterized in that: said volume varying portion of said hydraulic pump is tiltable in both forward and reverse directions from a zero angle neutral position driven by said tilting actuators; said feedback mechanism is constituted by a motion converting section adapted to convert a tilting motion of said volume varying portion into a longitudinal linear displacement along a straight line passing through a tilting center (C) of said volume varying portion, and a displacement transmission member located between said motion converting section and said control sleeve of said regulator to transmit said longitudinal linear displacement converted by said motion converting section to said control sleeve of said regulator, said displacement transmission member being constituted by a translation member adapted to be put in a rectilinear movement in the longitudinal direction of said straight line together with said control sleeve of said regulator, following a tilting motion of said volume varying portion; said motion converting section being located in an initial position (F—F, F