Electric motor actuation of a hydrostatic pump

Details Electric motor actuation of a hydrostatic pump Electric motor actuation of a hydrostatic pump

2008-06-02

2011-12-13

Lopez, Daniel (Department: 3745)

Power plants

Pressure fluid source and motor

Input pump and rotary output motor system having...

Reexamination Certificate

active

08074451

ABSTRACT:
A hydraulic motor system for improved frequency response includes a hydraulic variator having a pump and a motor, wherein the pump includes a variable angle swash plate, and the system further includes an electric actuator for controlling an angle or torque of the swash plate, thereby controlling the motor output characteristics. The electric actuator for controlling the variable angle swash plate may comprise a linear electric motor, ball screw drive or a rotary electric motor. In an example, the rotary electric motor tilts the swash plate by applying a torque to the swash plate at a point away from its tilt axis. In a further example, the rotary electric motor tilts the swash plate via a worm drive or ball screw drive.

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