| 摘要 |
PROBLEM TO BE SOLVED: To prevent dashing motion in which a tractor is moved at high speed by the operation of an engine when the engine is started with a sub-transmission gear mechanism switched into a low-speed side. SOLUTION: In this working vehicle wherein a continuously variable transmission for running output, the sub-transmission gear mechanism and a differential gear mechanism for transmitting power to right and left wheels are mounted inside of a transmission case to which the power from the engine is transmitted, and further a hydraulic pump for sub-gear shift, driven by the engine, and a sub-gear shift hydraulic cylinder for shifting and controlling the sub-transmission gear mechanism are mounted, the sub-gear shift hydraulic cylinder is shifted to the low-speed side to switch the sub-transmission gear mechanism to the low-speed side when the operation for starting the engine is performed, and the sub-gear shift hydraulic cylinder can be shifted to a high-speed side after a certain period of time from the start of the engine. COPYRIGHT: (C)2006,JPO&NCIPI |
