| 摘要 |
PURPOSE:To obtain stable running along a contour line or the like without unbalancing a main machine or the like on an inclined ground by shaping the essential contours of a tire almost into an octagon for increasing the horizontal rigidity to maintain good paddy-field capacity and drive power. CONSTITUTION:A rubber tire 1 is composed of a lug 2. a crown part 3, both shouler parts 4, both side-wall parts 5, and both bead parts 6. In this case, the shoulder parts 4 are lantingly extended at an angle alpha from both ends of the crown part 3 to the outside of the diametral inward width, and the slanting angle alpha is set at 20-60 deg.. Meanwhile, the bead parts 6 are extended at a slanting angle beta from the diameter inner end of both side-wall parts 5 to the inside of the diametral inward width, and the slanting angle beta is set at 15-60 deg.. In this construction, the essential contours of a tire composed of imaginary faces 14 connecting between above-said parts 3-6 and both bead parts 6 is shaped almost into an octagon, and the section of both side parts of the tire 1 is shaped into a C-letter for promoting horizontal and vertical rigidities. |
