Method of designing a tire, method of designing a vulcanizing mold for a tire, method of making a vulcanizing mold for a tire, method of manufacturing a pneumatic tire, and recording medium with tire designing program recorded thereon

Abstract

A method of designing a tire which takes into consideration actual conditions in the presence of a fluid, such as drainage performance, on-snow performance, noise performance, and the like. A tire model and a fluid model including the shape, structure, and the like are constructed, and a road surface condition is inputted (steps to ). Boundary conditions during tire rolling or tire nonrolling are set (step ), deformation calculation and fluid calculation of the tire model are performed (steps to ), and a boundary surface between the tire model and the fluid model is recognized to update the boundary conditions (steps and ). The result of calculation is outputted as the result of estimation, and based on this result of estimation, main travel paths of the fluid, i.e., streamlines, are adopted (step ), grooves are formed along the determined streamlines so that a tire model with patterns is constructed (steps and ), and the draft design having satisfactory performance is adopted (steps to ).