| 摘要 |
<p>Each side of a circumferential tread groove (1) consists of seven, each other alternating portions (11, 12, 13, 14, 15, 16, 17) whereof first, third an sixth portion (11, 13, 16) is parallel with a cimcumferential centre axis (7) of the tread and the rest of the portions (12, 14, 15, 17) are inclined at the angles (alpha, tau) with respect to said axis (7), whilst every second portion (12) of each side of each circumferential groove (1) is arranged diametrically to the seventh portion (17) of a respective opposing side of the circumferential groove (1), and, each first portion (11) of each side of each circumferential groove (1) is arranged diametrically to the portions (13, 14, 15, 16) of a respective opposing side of the circumferential groove (1). The angle (alpha) between the second, fifth portion (12, 15) and the cimcumferential centre axis (7) ranges from 35° to 55° , and, the angle (tau) between the fourth, seventh portion (17) and the cimcumferential centre axis (7) equals a total of the angle (alpha) and the right angle.</p> |
