Influence of an odd structure in cross ply tires. / Influência da estrutura ímpar em pneus de lonas cruzadas (cross-ply).

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

The tire is the only bond between the vehicle and the ground, is it that transmits all the power and load, and guarantees the driven and conduction of the automobile. The resistant structure of a tire is one of the most important factors for the efficiency, type of application and security. Knowing these parameters is the primary condition to design a tire. Conventional tires, usually have a pair structure, made of crossed plies (cross-ply) in opposite angles lesser than 90º. The present work aim to evaluate the influence of an odd cross-ply structure, in conventional tires, looking forward to a material reduction and also an optimization on time process. The influence of an odd structure was evaluated through a finite element analysis, examining the cord stress at the tire carcass and the tire/ground contact region (foot-print). The variation of the uniformity was also verified through a SAE332 test did on Akron FD90 machine. It was observed that the use of an odd structure in cross-ply tires cause a tire/ground contact region deformation, because of the unbalance internal cord stress (at the carcass), and an increase of uniformities components (ply-steer and variation of lateral force). The use of an odd structure must be carefully selected, depending on the speed, severity and condition of use.

ASSUNTO(S)

finite element estrutura ímpar lonas cruzadas elementos finitos uniformidade pneu cross-ply pneu convencional conventional tire odd structure tire uniformity

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