Pneumatic tire with specified rubber properties
US6223797A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 27, 1999 |
| Grant date | May 1, 2001 |
| Priority date | — |
| Expiry date | Jan 27, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T152/10855
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
Disclosed is a pneumatic tire which comprises a carcass layer provided between a pair of left and right bead sections, left and right side wall sections interpolated for connecting the pair of left and right bead sections with a tread section to be continuous, and at least two belt layers provided in an outer peripheral side of the carcass layer in the tread section, each of the belt layers being composed of a plurality of reinforcing cords coated with coating rubber. Storage elastic modulus E' of the coating rubber is set in a range of 15.0 to 40.0 MPa, and its loss tangent tan .delta. is set in a range of 0.1 to 0.25. Interlayer rubber is provided between end parts of the belt layers, the interlayer rubber being specifically set in each of both end parts thereof in a tire width direction, and elongation to break Eb of the interlayer rubber is set in a range of 400 to 700%. In another embodiment, at least a 30% area of a cross-sectional area of the bead apex positioned in the range of 20 to 35% of a tire section height SH is made of low tan .delta. rubber which is set in a range of 25 to 75% of tan .delta. of base bead apex rubber for a bead apex main body.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.