Method of forming tire with a profiled innerliner
AssigneeMichelin Recherche et Technique S.A.
InventorsDavid Alan Weston, Cesar Enrique Zarak
Life of this patent
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Abstract
The innerliner ply of a tire has been modified in thickness to provide a profiled innerline ply. A permeability relationship is established for the material of the innerliner that allows the average thickness of the innerliner ply to be adjusted based on its temperature. The maximum and minimum thickness are located in relation to the maximum and minimum internal temperature locations within the tire. A gradual change in thickness is used between the maximum and minimum thickness locations. An object of the invention is to limit the air flow through the tire in locations which have a high internal temperature. This limited air flow will improve the deterioration of rubber products in the tire and maintain an allowable inflation pressure air loss rate.
Claims5
A method for determining in a pneumatic tire a profiled thickness for an innerliner ply comprising the steps of:
- a) selecting a material for said innerliner ply of said tire;
- b) determining a permeability coefficient and an air permeability versus temperature relationship for said innerliner ply material;
- c) determining the temperatures of the innerliner ply of the tire at locations along the extent of the innerliner ply using simulated operating conditions of said tire;
- d) calculating a plurality of thickness values of said innerliner ply in relation to said locations based on a selected inflation pressure and loss rate of air permeating through the innerliner ply and respective temperatures of said innerliner ply;
- and
- c) forming said innerliner ply to have a thickness of the calculated thickness values for providing said profiled thickness for said innerliner ply.
Dependencies are inferred from the claim text.