| 摘要 |
PROBLEM TO BE SOLVED: To make a gear shift operation of sub-transmission smooth even when a torque is outputted from a main-transmission in a work vehicle equipped with a running transmission system equipped with the sub-transmission of gear transmission type in a transmission downstream of the main-transmission consisting of a static hydraulic continuously variable transmission. SOLUTION: The transmission system is characterized in that a pair of oil passages a, b for transmission connecting an oil pump P with an oil motor M in the main-transmission 12 are connected by communication through a bypass oil passage g, and in that a valve mechanism 65 opening/closing this bypass oil passage g can be optionally opened/closed with an artificial operation tool 73 installed in an operation section. COPYRIGHT: (C)2007,JPO&INPIT |
