Apparatus and method for sensing unbalance force and location th

Details Apparatus and method for sensing unbalance force and location th Apparatus and method for sensing unbalance force and location th

1991-05-03

1993-04-13

Chapman, John E.

Measuring and testing

Rotor unbalance

Dynamic

G01M 122

Patent

active

052012247

ABSTRACT:
A force sensing apparatus and method in a vehicle wheel balancer is disclosed which in one embodiment includes use of a voltage controlled oscillator connected to drive a piezoelectric crystal at an oscillation frequency which is compared in phase to a frequency generated by the wheel balancer spin shaft encoder. When unbalance force imposed changes occur in the crystal oscillation frequency, an unbalance output is provided by the comparison which contains the unbalance force magnitude and angular orientation information. The unbalance output is processed to provide operator indications for facilitating application of counterweights to the vehicle wheel.

REFERENCES:
patent: 3452603 (1966-05-01), Kaiser et al.
patent: 4046017 (1977-09-01), Hill
patent: 4594898 (1986-06-01), Kirman et al.

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