Patent ID: 9052257
Filing Date: 2015-06-09
Classification: G01M,G01N

Abstract:
1. A method for calculating a rubber index of a tire comprising a tire frictional energy measurement step in which a tire frictional energy of the tire under plural tire input conditions which are provided to the tire is measured by a frictional energy measurement device which performs measurement based on the shearing force and the slippage of the tire contact patch, a contact pressure measurement step in which a contact pressure at a site related to the evaluation of rubber wear of the contact patch portion of the tire is measured, a pressing load setting step in which setting is performed such that the contact pressure is applied to a sample as a pressing load, a setting step in which a sample frictional energy of the sample of the same material as that of the tire is determined under sample input conditions set based on the tire frictional energy under each of the measured tire input conditions in a state in which the pressing load is applied to the sample, and a measurement condition for measuring a sample wear amount of the sample is set based on the tire frictional energy under each of the measured tire input conditions and the sample frictional energy determined under each of the sample input conditions, a sample wear amount measurement step in which the sample wear amount of the sample is measured by a wear amount measurement device under the set measurement condition and a rubber index calculation step in which the rubber index of the tire is calculated based on the measured sample frictional energy and the sample wear amount.