Optimal Body Ply Shape for Heavy Truck Tires Containing Belt Ply in the Crown Section

Abstract

A tire having uniform inflation growth is provided. The tire includes a body ply that is displaced from the conventional equilibrium curve along the bead, sidewall, and shoulder portions of the tire in a manner that provides more uniform inflation growth from bead portion to bead portion. Such construction reduces load sensitivity, reduces or eliminates the tire break-in period, and / or decreases the propensity for cracking—particularly along a groove bottom of the tread in the shoulder.

Description

technical field [0001] The subject-matter of the invention relates generally to a novel shape of a body ply or carcass for tires comprising a tire. Background technique [0002] The body ply of the tire, sometimes called the carcass or carcass ply, extends from the bead portion through two opposing sidewall portions and the crown portion of the tire. Its construction typically uses one or more layers comprising a substantially inextensible material called, for example, a cord. For radial tires, within the crown portion, these cords are generally oriented at a position greater than about 80 degrees measured from the equatorial plane of the tire. In pneumatic tires, the body ply helps limit inflation pressure and defines the overall shape of the tire when inflated. When the tire is inflated to a given pressure, the body plies will have a certain shape or contour in the meridian plane, known as the equilibrium curve. [0003] The body ply design poses a problem for all tires...

AI Technical Summary

Problems solved by technology

Increased mass may adversely affect tire properties such as rolling resistance

Images