| 摘要 |
PURPOSE:To make the titled tire into a low noise, low oscillation and high speed stabilized one, by a method wherein a tread groove is formed so that a phase difference is provided on both sides of a tread, an area ratio between a lug part and the tread groove is specified on a specific section imagined by a reverse phase and those ratios become identical among sections with each other. CONSTITUTION:A group of sections 12 for a positive direction half mode 13 is set up by imagining an imaginary line 10 met at right angles with a center line 7 of a tread and provided at gradually reducing pitches ln-lo, and a first mode 15 is formed by connecting a reverse direction half mode 14 with the half mode 13, which is arranged on one side 9 of the tread. The half modes 13 and 14 are provided on one side 16 of the tread in the reverse order, and a second mode 17 is arranged against the first mode 15 by placing phase differences of 1/24-5/24 times of a mode length L1. A tread groove 19 meeting at angles of 0-10 deg. with the imaginary line 10 is formed on each of sections so that an area of a lug part 20 becomes 1.2 0.3 times of that of the tread grooves 19 and the ratios become about identical among sections with each other. With this constitution, the titled can be made into a low noise, low oscillation and high speed stabilized running one. |
