Pneumatic tire having directional tread pattern
US6206064A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 8, 1998 |
| Grant date | Mar 27, 2001 |
| Priority date | — |
| Expiry date | Apr 8, 2018 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60C2011/0388
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
At a portion of an inclined main groove from a tread center to an auxiliary groove of a pneumatic tire, an angle of inclination .theta.1 of a groove wall surface at a block step-in end side is set to be smaller than an angle of inclination .theta.2 of a groove wall surface at a block kick-out end side. Therefore, rigidity of step-in ends of blocks defined by inclined main grooves is lowered such that a striking sound can be reduced. Further, at a portion of the inclined main groove from the auxiliary groove to a tread end, an angle of inclination .theta.1 of a groove wall surface at a block step-in end side is set to be greater than an angle of inclination .theta.2 of a groove wall surface at a block kick-out end side. Therefore, rigidity of kick-out end sides of blocks defined by the inclined main grooves is lowered. Heel-and-toe wear which occurs at the kick-out end sides is suppressed, and an increase in pattern noise caused by heel-and-toe wear is suppressed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.