| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a small-radius turning control device of an articulated vehicle that does not require a number of handle turn operations by: using an inexpensive circuit employing an existing pump; and exhibiting a small-radius turning brake mode even if not under a full articulated state. <P>SOLUTION: When a handle is turning-operated to deflect a frontward vehicle body with respect to a rearward vehicle body in a state where a small-radius turning switch is turned on, a controller closes electromagnetic valves 56A and 56B to interrupt between a left brake circuit 41 and a right brake circuit 42, and changes a direction selector valve 59 over to change a pump 57 over from the other circuit 60a to a small-radius turning pressure supplying circuit 60. Either of a left small-radius turning proportional pressure decreasing valve 63 and a right small-radius turning proportional pressure decreasing valve 64 corresponding to an inner side of a turning direction is controlled into a valve opening state and an electromagnetic valve 66 is also controlled into a valve opening state, thereby, operating oil accumulated in an accumulator 62 is supplied to either of the left brake circuit 41 and the right brake circuit 42. <P>COPYRIGHT: (C)2012,JPO&INPIT |
