Patent ID: 6622594
Filing Date: 2003-09-23
Classification: B60W,F16H,Y10T

Abstract:
An apparatus for controlling a plurality of hydraulic motors and a clutch in which a single driving shaft is driven by outputs of a plurality of hydraulic motors, and one of the plurality of hydraulic motors drives the driving shaft through the clutch, comprising:zero tilt rotation fixing means for fixing the tilt rotation amount of a first hydraulic motor to zero when a zero fixing pressure, Pcs=Pf, of a predetermined value is input; a clutch that is disengaged when a release pressure, Pk, of a predetermined value that is larger than the zero fixing pressure, Pf, is input; hydraulic vehicle speed detecting means for detecting a vehicle speed by a vehicle speed signal pressure, Pv, based on a vehicle speed; and control valve means that releases an output command pressure, Pcs, to a return pressure, Pt, connected to a tank until a vehicle speed signal pressure, Pv, received from the hydraulic vehicle speed detecting means reaches a start pressure, Pb, of a predetermined value, and begins to output the commend pressure, Pcs, to a zero tilt rotation fixing means and the clutch when the vehicle speed signal pressure, Pv, exceeds a predetermined value.