| 摘要 |
PURPOSE:To improve the floatation effect by setting the pitch interval between lugs, top surface width, height, starting-up angle for a tread part, and the angle for an equator to each prescribed value and setting the basic part width wider than the top surface width, in a superlow-pressure pneumatic tire. CONSTITUTION:The pitch interval P of lugs 7 is set to 70-120mm, and the width A of the lug top surface 10 is set to 0.5-4.5mm, and the height H is set to 8-25mm. Further, the inclination angle beta of the starting-up surface 11 on the precedence side in the direction of revolution for a tread part 2 is set to 95-130 deg., and the inclination angle theta of the starting-up surface 12 on the trailing side in the direction of revolution is set less than 90 deg.. Further, the inclination angle alpha for an equator 9 is set to 95-125 deg. and the basic part width E of the lug 7 is set wider than the top surface width A. With such constitution, the softness of the tire is increased, and the road-surface scraping quantity is reduced, and the floatation effect of the tire can be developed to the max. |
