Pneumatic radial tires including a fork-shaped groove
US5609699A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 15, 1995 |
| Grant date | Mar 11, 1997 |
| Priority date | — |
| Expiry date | Sep 15, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60C2011/0374
- WIPO fieldTransport
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.