Multi harmonic tire uniformity correction
AssigneeMichelin Recherche et Technique S.A.
InventorClarence Hair
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Abstract
An apparatus and method for reducing the magnitude of multiple harmonics of uniformity characteristics in a cured tire is claimed. A signal is generated which indicates the magnitude of the uniformity characteristic. A ring containing multiple plates is utilized to permanently deform portions of the carcass reinforcing member of the tire at locations indicated by the signal. The configuration of the plates is automatically determined based on the tire radial force variation waveform and the number of plates used.
Claims15
A method for reducing the magnitude of a uniformity characteristic in a cured tire, said method comprising the steps of:
- a. generating a signal indicative of a magnitude of the uniformity characteristic and an angular location on the tire to be corrected;
- b. decomposing the signal into two or more harmonics using a Fourier analysis;
- and
- c. permanently deforming, as a function of the magnitude of the uniformity characteristic, a portion of at least three carcass reinforcing members of the tire at the locations indicated by the signal, wherein at least two harmonics of radial force variation are reduced simultaneously.
An apparatus for reducing the magnitude of radial force variation in a cured tire containing carcass reinforcing members, comprising:
- at least two removable plates arranged circumferentially to form a ring, which permanently deform, as a function of the magnitude of the uniformity characteristic, a portion of at least three carcass reinforcing members of the tire at the locations indicated by a signal indicative of a magnitude of the radial force variation and an angular location on the tire to be corrected, wherein at least two harmonics of radial force variation are reduced simultaneously, and wherein the means for controlling the height of the plates can provide for a continuous selection of heights between the minimum and maximum.
Dependencies are inferred from the claim text.