Hydraulic pump mechanically interconnected with fluid motor distributors

Abstract From the Canadian patent

A hydraulic pump assembly having a motor actuated by a source of fluid under pressure and in turn actuating a fluid pump under the control of a valve responsive to operation of the motor. The diameter of a piston of the pump is smaller than the corresponding diameter of a piston of the motor in order to permit the pump to obtain higher output pressures than are required to acruate the motor. The valve includes a valve element connected directly to the piston of the motor and slidably disosed in a pair of axially spaced, cylindrical housing parts so as to sequentially place ports provided in spaced ends of the valved element in communication with passages provided in the cylindrical housing …