Tread for a unidirectional pneumatic tire

US4953604A · kind A · utility

Assignee

• The Goodyear Tire & Rubber Company · US

Inventors

• Peter Ross Shepler · Cuyahoga Falls, US
• Nathan A. Gammon · Akron, US
• William M. Hopkins · Hudson, US
• James Earl Koerner · Uniontown, US
• Charles Kenneth Schmalix · Canal Fulton, US

Key dates

• Filing date: May 25, 1989
• Grant date: Sep 4, 1990
• Expiry date: May 25, 2009

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60C2011/0374
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A tread for a unidirectional pneumatic tire has first, second and third circumferentially extending zones. The edges of the zones are parallel to the equatorial plane of the tire. The width of the first zone is between 25% and 50% of the tread width, the width of the second zone is between 15% and 35%, and the width of the third zone is between 25% and 50%. 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 a plane in the first zone parallel to the equatorial plane. 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 a plane in the second zone parallel to the equatorial plane. The third zone has substantially aligned lateral wide groove segments extending across the width of the third zone which are generally perpendicular to the lateral wide groove segments of the second zone. The segments form an angle between 45 and 70 degrees with a plane in the third zone parallel to the equatorial plane.