| 摘要 |
PURPOSE:To make it possible to effect white-noise, in a tire having less than 45 total pitch number of patterns, by laying basic pitch groups of patterns in the order of their lengthes, and as well by arranging the patterns over the entire periphery of the tire with the use of one cycle having a specific arrangement as a basic pattern. CONSTITUTION:The total pitch number of tire pattern is set less than 45, and estimating that the lengthes of (m) kinds of basic pitches are l1, l2,...lm (l1< l2...<lm) in the order of their lengthes, the following relation is satisfied, 1<ln/ ln-1<=1.08 (n=2,...m). Further, lm/l1<=1.8. Further estimating that groups having suitable number of arranged basic pitches are L1, L2...Lm, and the one in which these group Ln is arranged such as L1, L2, L3,...Lm-1, Lm, Lm-1,...L3, L2, L1 is taken as one cycle, the entire periphery is constituted by two cycles. With this arrangement, the realization of white noise may be made possible, and as well uneven abrasion may be reduced. |
