Bosch Rexroth Ag

The Rexroth Corporation

Mannesmann Rexroth Corporation

Brian William Smith

Eric D Ramseyer

Mark Douglas Correll

Mark Douglas Smith

A HEUI system uses a fixed displacement, radial piston pump to provide a generally constant pump flow of high pressure hydraulic fluid over the operating speed range of the radial piston pump to minimize parasitic power drains on the engine. The radial piston pump includes an orificing suction slot to vary the pump displacement over the operating speed of the pump. A throttling valve at the pump inlet may be provided to starve inlet fluid feed if reduced flow to the injectors is additionally required.

Suction controlled pump for HEUI systems

A HEUI system uses a fixed displacement, piston pump to provide a generally constant pump flow of high pressure hydraulic fluid over the operating speed range of the pump to minimize parasitic power drains on the engine. The piston pump includes an orificing suction slot to vary the pump displacement over the operating speed of the pump. A throttling valve at the pump inlet may be provided to starve inlet fluid feed if reduced flow to the injectors is additionally required.

A HEUI system uses a fixed displacement, axial displacement pump to provide a generally constant pump flow of high pressure hydraulic fluid over the operating speed range of the pump to minimize parasitic power drains on the engine. The axial piston pump includes a orificing suction slot to vary the pump displacement over the operating speed of the pump. A throttling valve at the pump inlet may be provided to starve inlet fluid feed if reduced flow to the injectors is additionally required.

An axial piston pump has a rotatable input shaft integral with a rotatable swash plate. A non-rotatable cylinder contains a plurality of axially movable pistons having spherical ends extending through the cylinder journaled in slipper assemblies that are in contact with the swash plate. A retainer plate in contact with the slipper assemblies is spring biased to urge the slippers against the swash plate to maintain the swash plate in fixed axial position. The input shaft is journaled only by a sleeve bearing while an annular thrust bearing plate between pump housing and a swash plate axial end allows for swash plate rotation within the pump housing. The swash plate has a cam shaped circumferential edge surface. An auxiliary pump having a prime mover in contact with the cam shaped edge of the swash plate is mounted between the axial ends of the piston pump.

Axial piston pump with auxiliary pump

A pressure plate provides metering grooves in a face thereof contiguous to the gears of a gear pump. The grooves communicate certain pockets between adjacent gear teeth with other such pockets so as to meter fluid from pockets in which fluid is trapped at relatively high pressures to pockets in which fluid is trapped at relatively low pressures, thereby controlling the pressure distribution.

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Wooster, OH, United States of America

Brian William Smith