| 摘要 |
PURPOSE:To strengthen a tracking force while the running performance is maintained as is by arranging blocks, both the angle to an equator line and their cross sectional shape of which are specified, transversally into a herringbone pattern in such a way that each of them overlaps each other in the circumferential direction. CONSTITUTION:Each of center blocks 8 in an inverted V shape is arranged on an equator line L-L forming an angle alpha of 90-125 deg. with the equator line L. And each of intermediate blocks 8 is arranged on the extension line of the said center block so that each of them with respect to the circumferential direction overlaps (10) each other transversally. And the block 8 is formed into a trapezoidal shape in cross section where a rising angle beta of the kicking surface 11 facing the direction 9 that a wheel rotates, is made to be greater than a rising angle theta of the counterkicking surface 12 at the opposite side. In addition, the said kicking surface 11 is made to be parallel to the said angle alphaof inclination. This configuration is capable of strengthening a tracking force without degrading the running performance. |
