| 摘要 |
PURPOSE:To improve the extent of groundability in a tire, by installing two types of pistons in a suspension cylinder, while moving the piston on one side with operation of a selector valve and thereby adjusting a stroke rate of the piston on the other, and changing the maximum rockable angle of a wheel shaft. CONSTITUTION:In case of running on the ground having large uneven undulations, the maximum rockable angle of a wheel shaft 6 is changed into extension. That is to say, a selector switch 22 is operated to a (a) position and a shutoff valve 17 is selected to a (c) position. And, a selector valve 31 is operated to a (f) position, and oil in each second piston oil chamber 30 of symmetrical culinders 12 is opened to an oil tank 21 through respective oil passages 38, 39 and 40, thus each second piston 28 is made into freedom. At this time, since the wheel shaft 6 is rocked centering on a center pin 11 of an equalizer 9, a clearance between the top of a first piston 27 and the underside of a stepped part 26 in a cylinder tube comes to 2X(S1+S2), so that the maxi mum rockable angle is thus expanded. |
