| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To share running system hydraulic devices of an HST (hydro-static transmission) specification and a gear specification as far as possible. <P>SOLUTION: A priority flow dividing valve 76 for dividing return oil of a power steering unit 70 into a priority flow circuit 76a and a surplus flow circuit 76b is installed in a return circuit 75 of the hydraulic fluid supplied from a hydraulic pump P1 to the power steering unit 70. A relief valve 77 for setting operation pressure is installed in the priority flow circuit 76a of the priority flow dividing valve 76. A second hydraulic clutch 51B for rotating a front wheel 12 faster than a rear wheel 13, and a first hydraulic clutch 51A for rotating the front wheel 12 and the rear wheel 13 at the same speed, are connected via switch valves 78A and 78B, respectively and brake cylinders 72L and 72R for braking the rear wheel on the inside of turning are connected via pressure reducing valves 79L and 79R. The charge circuit 2a of a hydro-static continuously variable transmission device 2 is connected to the surplus flow circuit 76b of the priority flow dividing valve 76. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
