Method of and apparatus for measuring an unbalance value of a wheel mounted on a body of an automobile

摘要

A method of measuring an unbalance value of a wheel wherein a plurality of curves showing the relation between the magnitude of vibration of the wheel when it is rotated and the true value of the unbalance which are preliminarily obtained according to the kinds of wheel or automobile on which the wheel is mounted are memorized and compared with the magnitude of the vibration of the wheel to be tested while it is rotated. A rough value of the unbalance corresponding to the magnitude of the vibration of the wheel to be tested is obtained by using a curve M which shows the largest change of the magnitude of the vibration with respect to the true value of the unbalance. The measuring of an unbalance value is repeated with respect to the wheel on which a counter-weight corresponding to the rough value of the unbalance is attached. Apparatus for measuring an unbalance value of a wheel comprises a detecting device for detecting the magnitude of vibration of the wheel, a memory for storing a plurality of curves showing the relation between the magnitude of vibration of the wheel and the true value of unbalance which are preliminarily obtained according to the kinds of wheel or automobile, a selecting device for selecting the curves stored in the memory, and a device for calculating the unbalance value by comparing each curve selected by the selecting device with the output of the detecting device and for displaying it.