Symmetrical and directional pneumatic tire tread
US5002109A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 25, 1989 |
| Grant date | Mar 26, 1991 |
| Priority date | — |
| Expiry date | May 25, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S152/902
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A tread for a unidirectional pneumatic tire has first and second circumferentially extending zones. The edges of the zones are parallel to the equatorial plane of the tire. Each zone has a width between 40% and 60% of the tread width. The first zone has substantially aligned lateral wide groove segments extending across the width of the first zone. The segments form an angle between 70 and 90 degrees with the equatorial plane. The net-to-gross ratio of the first zone is at least 3% more than that of the second zone. The leading edge of the blocks in the first zone are narrower than the trailing edge. The second zone has substantially aligned lateral wide groove segments extending across the width of the second zone. The segments form an angle between 10 and 45 degrees with the equatorial plane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.