| 摘要 |
PURPOSE:To improve the operationability of tractor comprising a front/rear wheel steering device and a differential gear associated with locking mechanism to be arranged in the power transmission path to the right/left driving wheels by functioning the locking mechanism to releasing side upon reverse phase steering of front/rear wheels. CONSTITUTION:In agricultural tractor 1, front and rear differential gears 51, 41 are arranged respectively in the power transmission paths to the front and rear wheels 11, 21 while locking mechanisms 61, 65 comprising lock pins 62, 66 for locking the differential cases 55, 45 and one side gears 56, 46 and the levers 63, 67 are provided to respective differential gear 51, 44. 4WS system for steering the rear wheel 21 in phase or reverse phase against the front wheel 11 through a link 85 with correspondence to planetary gear motion of pinion 81 gearing with a sector gear secured to the ceiling section of steering gear box 34 is provided. Upon detection of reverse phase steering condition, it is controlled to function the lock mechanisms 61, 65 to release side. |
