Patent ID: 7963158
Filing Date: 2011-06-21
Classification: G01M

Abstract:
1. A tire driving stiffness measuring apparatus comprising: a tire rotational shaft that rotatably supports a tire assembled on a wheel; a tire motor for increasing or decreasing a tire rotational frequency while the tire is being rotated; a rotational frequency measuring means for measuring the tire rotational frequency; a test drum for rotating around a drum rotational shaft that is parallel to the tire rotational shaft; a drum motor for rotating the test drum at a constant drum speed; a speed meter for measuring the drum speed; a load applying means for pushing the tire against the test drum with a tire load applied in a direction from the tire rotational shaft toward the drum rotational shaft; a radial force load cell for measuring the tire load; an tangential force load cell for measuring an tangential force that is exerted on the tire in a direction orthogonal to both a direction from the tire rotational shaft toward the drum rotational shaft and a direction of the tire rotational shaft; and a recording means for recording a measurement result of each of the drum speed, the tire rotational frequency, the tangential force and the tire load, the tangential force being generated by increasing or decreasing the tire rotational frequency while the tire load is being applied against the tire, and during increasing or decreasing the tire rotational frequency, the drum speed, the tire rotational frequency, the tangential force and the tire load being measured respectively at plural discrete measurement time points, and the measured results thereof being recorded respectively in association with every measurement time point thereof.