Improved tire uniformity through compensation between radial run out and stiffness variation

Abstract

Methodology for characterizing non-uniformity forces at a tire spindle, such as low and high speed radial force variations and high speed tangential force variations include the steps of measuring radial run out and radial or tangential force variations at high and / or low speeds. From such measurements, the contribution of a predetermined type of stiffness variation (e.g. radial, tangential, extensional, bending) to respective radial and / or tangential force variations can be determined. Signature analysis statistical methods may also be utilized to characterize such tire non-uniform forces for different steps and reference physical angles of a tire construction process. Based on the characterization of such tire non-uniform forces, additional process steps may further correspond to tire grading and / or sorting processes, physical tire modification processes and tire manufacturing processes. Tire correction mechanisms and / or feedback control in a tire manufacturing process preferably yield tires having radial run out and stiffness variation parameters that are out of phase for one or more harmonics, thus yielding a reduction in the non-uniformity forces such as radial and tangential force variations at a tire spindle.

Description

technical field [0001] [0001] In general, the present invention relates to techniques for characterizing tire conformity performance parameters, such as radial and tangential force variations that affect tire conformity at low and high speeds. Characterization and prediction of such tire parameters and other parameters may then be used to evaluate, classify, or provide corrections to finished products, and / or to control various aspects of their manufacture. Background technique [0002] [0002] One example of a cause of vehicle vibration at high and low travel speeds corresponds to force variations at various tire spindle locations. This phenomenon is generally referred to as tire uniformity. High speed uniformity (HSU) of a tire may be particularly critical to tire performance levels since the potentially non-uniform nature of the tire produces significantly more vibration at faster highway speeds, such as over 25 mph. aspects of human attention. [0003] [0003] High Spee...

AI Technical Summary

Problems solved by technology

[0007] [0007] While known techniques for characterizing tire consistency and related aspects affecting tire manufacture have each been developed, no design has yet emerged that collectively incorporates all of the desirable characteristics subsequently revealed in accordance with the subject technology

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