TRAVELING DEVICE OF WORKING VEHICLE

摘要

PURPOSE:To avoid an engine stall on rising a stairs and a dangerous speed on descending to automatically adjust the speed within an appropriate range for both upward and downward directions and always the engine is driver at the rated revolution to drive a vehicle at a high efficiency and the driver's operation can be simplified. CONSTITUTION:This device is provided with a detector 8 for detecting the inclination of a vehicle body 1, a detector 9 for detecting the load on an engine 3, a first transmission Changing means 10 for setting the upper speed limit lower as the loading ratio is larger when the detected loading rate exceeds 50% and a second transmission Changing means 11 for setting the upper speed limit lower as the slant of the vehicle body is larger and the slope angle is more acute. When rising with a larger load, the speed is lowered in two stages to reduce the engine load and when descending with a smaller load, the vehicle speed is reduced more as the descending angle is more acute to avoid a dangerous speed.