Patent ID: 7775040

Claim:
A hydraulic transformer, comprising: a housing; a first bidirectional pumping mechanism disposed within the housing and configured to be selectively rotated by pressurized fluid to generate a torque and driven to pressurize fluid; a second bidirectional pumping mechanism disposed within the housing and configured to be selectively rotated by pressurized fluid to generate a torque and driven to pressurize fluid; a shaft connecting the first and second pumping mechanisms such that each of the first and second pumping mechanisms is operable to drive the other of the first and second pumping mechanisms, a first passage configured to direct pressurized fluid to the first pumping mechanism in a first rotational direction during a first operation; a second passage configured to direct pressurized fluid to the second pumping mechanism in the first rotational direction during the first operation; a third passage configured to direct pressurized fluid to the first pumping mechanism in a second rotational direction during a second operation; a fourth high-pressure passage in selective fluid communication with the second pumping mechanism; and at least a fifth low-pressure passage in selective fluid communication with at least one of the first and second pumping mechanisms.