| 摘要 |
PURPOSE:To prevent partial wear of a tread surface, and peeling-off and cracks of treads by forming the tread from a layered body of two rubber layers, and layering both the right and left side parts, which consist of different kinds of rubber compounds, of the respective rubber layers at the tread center part. CONSTITUTION:The tread 50 of a tire is formed from two layers of rubber layers 51, 52. Besides, the left side parts 51a, 52b and the right side parts 51b, 52b, which consist of different kinds of rubber compounds whose characteristics (for example, hardness) are different, of the respective rubber layers 51, 52 are layered at the tread center part around a tire equator line O, and jointed to be ford. Moreover, at the tread center part around the tire equator line O, jointing parts 51c, 52c of the respective rubber layers 51, 52 are formed in a stepped condition so that the different type rubber compounds may be made up each other in advance. With this constitution, the tread is made into an alternately layering structure where jointing surfaces are engaged with each other for making both the upper and lower surfaces of the respective rubber layers 51, 52 flat respectively. |
