| 摘要 |
PURPOSE:To reduce a pattern noise, by shifting each position of block elements constituting a block pattern A properly at all block patterns, independent of structure and type of a tire. CONSTITUTION:A tire pattern A is divided into plural block rows i=0-3 by the groove 2 continued in a tire circumferential direction T. And, mutually identical pitch configuration is applied to each block row i=0-3 independent of the form of each block element. A centroid of each block element having block pitch length most approximate to the average block pitch length among these block elements in one block row installs a phase shift alphai with a centroid of the corresponding block element in other block rows. That is to say, each centroid of adjacent block elements is shifted as far as by alpha1-alpha3 to the tire circumferential direction T, and this shift alphai should be set so as to meet an expression I. Here, N is of pitch number, N is of block row number and C of tire circumferential length. |
