RIGID CORE FOR FORMING TIRE

摘要

A rigid core for forming a tire is configured so that the non-uniformity of the amount of thermal expansion of the core body is reduced to improve the qual i ty of the ti re. The core body comprises divided core pieces (10i, 10o) divided inward and outward in a tire radial direction at a tire radial position (P) including a maximum width position (P0) of the tire forming surface. Outward divided core pieces (10o) disposed outward in the tire radial direction than the maximum width position (P0) and inward divided core pieces (10i) disposed inward in the tire radial direction than the maximum width position (P0) are respectively formed of metal materials different from each other in coefficient of thermal expansion. The coefficient of thermal expansion of the inward di vi ded core pi ece (10i) is higher than a coefficient of thermal expansion of the outward divided core piece (10o).