Pneumatic radial tires including a fork-shaped groove

Details Pneumatic radial tires including a fork-shaped groove Pneumatic radial tires including a fork-shaped groove

1995-09-15

1997-03-11

Maki, Steven D.

Resilient tires and wheels

Tires, resilient

Anti-skid devices

152209D, B60C11500

Patent

active

056096992

ABSTRACT:
A pneumatic radial tire possesses excellent drainage property on wet road without damaging steering stability and the like and has a tread pattern of a tread portion defined by a plurality of main slant grooves each extending from a pattern center toward a tread end in a gradually expanding direction and comprised of a steeply slant segment and a gently slant segment extending in a region near to a side end of the tread portion without crossing any other grooves. Further, a fork-shaped groove is bifurcated from the steeply slant segment at a position ranging from the pattern center within 1/4 of a width of the tread portion and provided with at least two branch groove segments each extending without crossing any other grooves. Each of land portions defined between the main slant groove and the fork-shaped groove and between the branch groove segments of the fork-shaped groove and tapered toward the pattern center has an included angle of 5-40.degree. and a surface height of a tapered zone of each of the land portions is gradually decreased toward a top side thereof.

REFERENCES:
patent: 4609022 (1986-09-01), Fetty et al.
patent: 4700762 (1987-10-01), Landers
patent: 5131443 (1992-07-01), Kuhr et al.
patent: 5421391 (1995-06-01), Himuro
patent: 5423364 (1995-06-01), Himuro
patent: 5549147 (1996-08-01), Kuhr et al.

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