| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a traveling transmission device of a farm working machine which can suppress or eliminate a change of a speed accompanied by the switching of transmission from HST transmission to HMT transmission. <P>SOLUTION: The traveling transmission device comprises a speed change swash plate angle setting means which sets, as a set speed change swash plate angle c, a swash plate angle between a non-loaded swash plate angle a possessed by a hydraulic pump in a speed change state that a stepless speed change part at the HST transmission and at non-loaded drive outputs a speed change drive force having a speed equivalent to an integral rotation appearance speed V which makes the integral rotation of a sun gear, a carrier and a ring gear of a planetary transmission part appear, and a loaded swash plate angle b possessed by the hydraulic pump in a speed change state that the stepless speed change part at the HST transmission and at set loaded drive outputs a speed change drive force having a speed equivalent to the integral rotation appearance speed V. When a swash plate angle sensor detects a swash plate angle equal to the set speed change swash plate angle c, a speed change control means switch-controls a set state from an HST set state to an HMT set state. <P>COPYRIGHT: (C)2013,JPO&INPIT |
