Parker-hannifin Corporation

Kinetics Drive Solutions Inc.

Stefan Haellgren

Gerald Dyck

Per-Ola Vallebrant

John Czepak

A hydrostatic assembly employing a 1hydraulic piston drive unit is described in which the output is increased without using additional servo assemblies by incorporating a 2hydraulic piston drive unit, coupling the drive shafts of both drive units together, and employing a common means to simultaneously adjust displacement of both the 1and 2hydraulic piston drive units. In such embodiments, coupling the drive shafts together such that the 1hydraulic piston drive unit is rotationally offset with respect to the 2hydraulic piston drive allows for a reduction in the amplitude of pressure pulsations associated with the hydrostatic assembly output, thereby smoothing out operation and improving durability.

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Trollhaettan, Sweden

Stefan Haellgren