Hydrostatic steering control for a tracked vehicle

摘要

A hydrostatic steering arrangement and control having the high speed steering capability of an output-driven system and the low speed steering capability of an input-driven system. The engine drives the vehicle through a fluid coupling and a multiple ratio hydraulic transmission, and the hydrostatic pump of the steering system is driven by the output (turbine) of the fluid coupling. Increased steering capability at vehicle speeds which would otherwise limit the steering capability, is achieved by controllably slipping the active torque transmitting device of the transmission. In this mode, the hydrostatic pump speed is permitted to increase, and the steering system operates essentially as though it were input-driven.