| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a multi-axle vehicle by which a front steering shaft and an intermediate steering shaft can always be steered properly at the same time even when an inside leak occurs in each hydraulic switching valve. <P>SOLUTION: A servo valve V<SB>1</SB>and an intermediate part independent mode-switching valve V<SB>2</SB>are interposed in a line communicating from a pressure source P<SB>S</SB>to a head side oil chamber and a rod side oil chamber of right and left intermediate part cylinders 3a, 3b of an intermediate part oil pressure circuit 3, and a line communicating from the head side oil chamber and the rod side oil chamber of the right and left intermediate part cylinders 3a, 3b to a tank. An end of a rotatable first link L<SB>1</SB>supported by a pin at a longitudinal intermediate part is connected to a front end of a rod of a right front part cylinder 2b of a front part oil pressure circuit 2, and the other end is connected to a spool of the servo valve V<SB>1</SB>. An end of a rotatable second link L<SB>2</SB>being supported by a pin at the longitudinal intermediate part and having the length of a predetermined link ratio to the first link L<SB>1</SB>is connected to a sleeve of the servo valve V<SB>1</SB>, and the other end is connected to a front end of a rod of the right intermediate part cylinder 3b. <P>COPYRIGHT: (C)2008,JPO&INPIT |
