| 摘要 |
In order to precisely calculate the rubber index of a tire, a rubber index calculating device: measures, by a frictional energy measuring device, frictional energies of a tire in plural tire input conditions applied to the tire on the basis of the shear force and the slippage of a tire contact patch; measures, by the frictional energy measuring device, frictional energies of a sample of the same material as the tire in sample input conditions that have been set on the basis of the frictional energies of the tire in the tire input conditions that were measured, and sets measurement conditions for measuring amounts of wear of the sample on the basis of the frictional energies of the tire in the tire input conditions that were measured and the frictional energies of the sample in the tire input conditions that were measured; measures, by an amount of wear measuring device, the amounts of wear of the sample in the measurement conditions that were set, and calculates the rubber index of the tire on the basis of the frictional energies and the amounts of wear of the sample that were measured. |
| 主权项 |
1. A tire rubber index calculating method comprising:
a tire frictional energy measuring step of measuring, by a processor and a frictional energy measuring device comprising a force applying device, an image capturing device and a shear force measuring device, tire frictional energies of a tire in plural tire input conditions applied to the tire, the tire frictional energy measuring step including:
applying, by the force applying device, the plural tire input conditions to the tire;capturing, by the image capturing device, an image of the contact patch of the tire and measuring a slippage of the tire contact patch from the image;measuring, by the shear force measuring device, a shear force applied to the tire by the force applying device; andcalculating, by the processor, tire frictional energies of a tire on the basis of the shear force and the slippage of the tire contact patch and storing the tire frictional energies in a memory; a setting step including:
setting, by the processor, sample input conditions for a sample of the same material as the tire on the basis of the tire frictional energies in the tire input conditions that were measured;obtaining, by the frictional energy measuring device, sample frictional energies of the sample in the sample input conditions;storing, by the processor, the sample frictional energies in the memory; andsetting, by the processor, measurement conditions for measuring sample amounts of wear of the sample on the basis of the tire frictional energies in the tire input conditions that were measured and the sample frictional energies that were obtained for the sample input conditions; a sample amount of wear measuring step of measuring, by a Lambourne testing device, the sample amounts of wear of the sample in the measurement conditions that were set and storing the sample amounts of wear that were measured in the memory; and a rubber index calculating step of calculating, by the processor, a rubber index of the tire on the basis of the sample frictional energies and the sample amounts of wear that were measured, wherein the setting step further includes:
a step of calculating, by the processor, per type of the tire input conditions, frictional energy functions representing the correspondence relationships between the tire input conditions and the tire frictional energies,a step of calculating, by the processor, expected values of the tire frictional energies on the basis of frequency data representing the relationships between tire inputs that were measured in actual vehicle travel using the tire and the frequencies of the tire inputs and the frictional energy functions per type of the tire input conditions,a sample input condition setting step of setting, by the processor, a sample input condition applied to the sample for measuring, by the frictional energy measuring device, the sample frictional energy of the sample,a sample frictional energy measuring step of repeatedly measuring, by the frictional energy measuring device, the sample frictional energy of the sample in the sample input condition that was set and measuring the sample frictional energy while changing the sample input condition until the sample frictional energy that has been measured matches the expected value of the tire frictional energy, anda sample amount of wear measurement condition setting step of setting, by the processor, as a measurement condition for measuring the sample amount of wear, the sample input condition in which the sample frictional energy that was measured matches the expected value of the tire frictional energy, and wherein the sample amount of wear measuring step comprises measuring, by the Lambourne testing device, the sample amount of wear of the sample in the measurement condition that was set in the sample amount of wear measurement condition setting step. |
