Work vehicle with hydrostatic steering system

Details Work vehicle with hydrostatic steering system Work vehicle with hydrostatic steering system

2007-07-24

2007-07-24

Morris, Lesley D. (Department: 3611)

Motor vehicles

Steering by driving

C180S006300, C180S006480, C180S006440, C180S006700, C180S305000, C701S050000, C701S051000, C701S052000

Reexamination Certificate

active

11040594

ABSTRACT:
A work vehicle with a hydrostatic steering system is disclosed which is capable of performing optimum control of the absorption torque of a hydraulic pump according to running load; capable of preferentially ensuring turning performance and implement speed when running load is relatively low; and capable of ensuring desired turning performance even when running load is relatively high. To this end, a bulldozer with a hydrostatic steering system, wherein the power of a hydraulic motor driven by pressure oil fed from a hydraulic pump operated by an engine is transmitted to right and left crawler tracks through a differential steering means composed of planetary gear trains etc., is designed to control the absorption torque of the hydraulic pump according to the speed ratio of a torque converter calculated by a speed ratio operation unit.

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