| 摘要 |
PURPOSE:To aim at the promotion of miniaturization and lightweightiness in a farm tractor, by constituting a wheel bearing case with a built-in power transmission mechanism to be rotatable around a wheel driving shaft to the bracket installed in a body frame, in case of the farm tractor that makes vertical positions of rear wheels variable. CONSTITUTION:A rear end of a body frame 7 is situated at a tip end of a wheel driving shaft 4 at the outside of a transmission case 3, and a bracket 8 is locked to the side of a safety frame 9 with a bolt 16. And, a wheel bearing case 6 is tightly attached to an outer side face of the bracket 8 free of rotation around the wheel driving shaft 4 after being fitted in a lockup 18 of a driving shaft case 17 covering the outer circumference of the wheel driving shaft 4. In this constitution, a lockup 20 of the wheel bearing case 6 to the bracket 8 is released, rotating it around the shaft 4 and altering its position, whereby each height of wheels 1 is altered. With this constitution, rigid strength in the driving shaft case or the like is reducible and, what is more, the promotion of miniaturization and lightweightiness is realizable. |
