APPARATUS FOR BALANCING MOTOR VEHICLE WHEELS

摘要

An apparatus for balancing one or a pair of motor vehicle wheels while on the axle whereby the wheel is supported on a stand having a transducer mounted therein for producing a voltage signal indicating the magnitude and angular imbalance location of the wheel. The voltage signal is applied to a quadratic circuit having a frequency characteristic which falls quadratically with the speed of wheel rotation and a 90 DEG phase lead of the output relative to the input voltage so that the output of the quadratic circuit is substantially independent of the speed of wheel rotation. The output of the quadratic circuit is applied to a measuring device which indicates the magnitude of the imbalance and to a circuit which causes stroboscopic flashes to be produced while the imbalance is at dead center bottom.