| 摘要 |
A pneumatic tyre has directional aspects both as to the plan view of the tread pattern, and the cross section of transversal grooves. The tread is disposed at the crown of a toroidal casing and is formed of blocks partitioned by circumferential grooves, and by transversal grooves arranged in a regular herring-bone pattern. The apex of a herring-bone groove is typically placed at the circumferential centre line of the tread, and the direction of rotation is such that the apex meets the road ahead of the flanks of the herring-bone. The transversal grooves are of asymmetric cross-section such that the groove root radius at the groove edge which leads in the direction of rotation is smaller than the trailing groove root radius. The leading groove wall angle may be less than the trailing wall angle. - |
