Process for modifying a uniformity of a tire
AssigneeBridgestone Corporation
InventorsMoriyasu Kumagai, Takehiro Kata
Life of this patent
Estimating the term…
Abstract
A process for modifying a uniformity of a tire comprising a radial carcass ply of rubberized organic fiber cords is modifications of radial force variation (RFV) and conicity force (COF), which is carried out by dividing RFV- or COF-rejected tire into two portions and applying different thermal hysteresis to these portions under specified conditions.
Claims15
A process for modifying a uniformity of a tire comprising a carcass ply of rubberized organic fiber cords arranged side by side in a radial direction of the tire, which comprises the steps of measuring a radial force variation (RFV) of the tire inflated under a given internal pressure, putting a first distinguishing mark to a first tire portion indicating a minimum value of RFV, putting a second distinguishing mark to a second tire portion indicating a maximum value of RFV, applying different relative thermal treatment to the first tire portion and the second tire portion, and keeping a state of applying the given internal pressure to the tire during cooling in the thermal treatment, wherein at least a sidewall portion of the first tire portion is heated to make a temperature thereof higher than that of the second tire portion at the finish of the heating of the first tire portion in the thermal treatment.
A process for modifying a uniformity of a tire comprising a carcass ply of rubberized organic fiber cords arranged side by side in a radial direction of the tire, which comprises the steps of measuring a radial force variation (RFV) of the tire inflated under a given internal pressure, putting a first distinguishing mark to a first tire portion indicating a minimum value of RFV, putting a second distinguishing mark to a second tire portion indicating a maximum value of RFV, applying different relative thermal treatment to the first tire portion and the second tire portion, and keeping a state of applying the given internal pressure to the tire during cooling in the thermal treatment, wherein the whole of the tire is uniformly heated at the same temperature and at least a sidewall portion of the second tire portion in the tire after the finish of the heating is cooled at a cooling rate faster than that of at least a sidewall portion of the first tire portion.
Dependencies are inferred from the claim text.