| 摘要 |
PROBLEM TO BE SOLVED: To keep stability of the position of an industrial vehicle of which the body frame is supported so as to be able to roll relative to a rear axle by restraining or permitting the rolling of the frame in accordance with the condition of the vehicle. SOLUTION: A body frame 1 is supported at its center by a support-pin 10, so as to be able to roll relative to a rear axle 9. An oil cylinder 13 is installed at a position between an end of a rear axle 9 and a body frame 1. An electromagnetic switch valve 18, an accumulator 19 and a pressure sensors 20 and 21 are equipped in an oil path circuit constructed of oil paths 16 and 17 that are connected to an upper room 13a and an lower room 13b respectively. According to the deviation of rolling angle of the frame 1 and the deviations of pressure in an upper-room 13a and a lower-room 13b in the oil cylinder, an electromagnetic switch valve 18 is switched either to a cut-off position 18a or to a communicating position 18b, and an controller 22 is installed which restrains or permits rolling of the frame 1 both in clockwise direction and in counterclockwise direction.
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