Work vehicle, e.g. bulldozer with hydrostatic steering system, has pump absorption torque control unit which controls torque absorbed by hydraulic pump based on computed speed ratio of torque converter

摘要

A speed ratio calculating unit computes the speed ratio of a torque converter (2). A pump absorption torque control unit (45) controls torque absorbed by a hydraulic pump (7) based on the computed speed ratio of the torque converter. The power of an engine (1) is transmitted to right and left sprockets (11A,11B) through the torque converter and a differential steering device. The power of a hydraulic motor (14), which is driven by hydraulic oil from the hydraulic pump operated by the engine, is transmitted to the right and left sprockets through the differential steering device.