| 摘要 |
PURPOSE:To reduce the shock generated in the shift from inertial running to HST running and also shift to the inertial running when an acceleration pedal is operated in a speed reduction direction even in an area where the depressing amount of an acceleration pedal is big. CONSTITUTION:A variable capacity hydraulic pump 2 and a variable capacity hydraulic motor 5 for running which is connected to this pump 2 with a closed circuit by a pair of main pipe passages 3, 4, are provided on a self traveling type work vehicle equipped with an HST running hydraulic device. A running power is obtained from the output torque of this hydraulic motor 5. In inertial running, without switching to the HST running mode just after outputting an HST running order, without switching to the HST mode, an HST running circuit is formed by switching an open/close valve 21 to a close position under such conditions as that the difference between the discharge flow of the variable capacity hydraulic pump 2 and the discharge flow of the hydraulic motor 5 is below a reference value. |
