Dual bead diameter tire
US5301728A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 19, 1993 |
| Grant date | Apr 12, 1994 |
| Priority date | — |
| Expiry date | Jan 19, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T152/10855
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A pneumatic tire having two different bead diameters has handling, ride and treadwear advantages. The tire is made so that the rho.sub.m of the longer sidewall and the rho.sub.m of the shorter sidewall are equal. The rho.sub.m of the longer sidewall is made equal to the rho.sub.m of the shorter sidewall by establishing a belt profile wherein the amount of drop at a belt edge is specified to give a mold drop of 0.30 to 0.33 of estimated tire deflection, applying an inflated shape prediction formula to calculate the inflated belt profile and varying the value of rho.sub.m until the drop at the end of the belt closely matches a specified value, using the cosine law to specify the change in belt angle with radius, choosing a shoulder point under the belt edge that allows a 0.050 inch wedge between the bottom of the belt and the top of the carcass ply and varying the slope of the ply at the shoulder point until the inflated ply line passes through the Y-max location at rho.sub.m.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.