Importance

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Abstract

A wheel attached to a vehicle body via a suspension mechanism including an unsprung member is placed on and rotated by a rotating drum. A phase detector detects the rotational phase of the rotating wheel. A support table positioned adjacent the rotating drum is movable on three mutually perpendicular axes. A spring plate mounted on the support table is placed in resilient contact with a measuring surface of the unsprung member. The spring plate vibrates in response to vibration of the unsprung member in the longitudinal direction which in turn vibrates in response to wheel unbalance. A displacement detector on the support table includes a light source and light receiving elements which detect vibration of the spring plate caused by movement of the unsprung member in the longitudinal direction and thus detect wheel unbalance. Upon detecting wheel unbalance, a weight is selected which corresponds to the detected longitudinal amplitude of vibration of the unsprung member in accordance with a predetermined relationship between the longitudinal amplitude and the weight and the weight is attached to the rim of the wheel at an unbalanced point.

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First Claim