Measuring and testing – Rotor unbalance – Dynamic
Patent
1982-08-10
1984-11-06
Gill, James J.
Measuring and testing
Rotor unbalance
Dynamic
73473, G01M 118
Patent
active
044804725
ABSTRACT:
A dynamic electric wheel balancer for measuring the imbalance condition in a vehicle wheel and indicating the position and correction weights required for balancing the wheel in one or two planes. The wheel balancer contains a rotating shaft in order to make the dynamic measurements. The shaft is free wheeling during measurement and is brought up to a predetermined minimum r.p.m. value through a motor and clutch arrangement. After measurements have been made, a solenoid actuated brake, which takes advantage of the force factors associated with a flywheel forming part of the main shaft, brings the rotating shaft to a halt. Prior to taking the measurements, the wheel balancer is calibrated by employing a known weight located at a known position on a face plate forming part of the main shaft. In order to take the measurements, piezoelectric sensors are used to measure the vertical force components exhibited by the imbalance condition of the vehicle wheel secured to the rotating main shaft. The balancer finds the definite integral of each of the forces generated by the piezoelectric transducers and uses the cross correlation data generated by these integrations to find the zero crossing points and the peak determinations. The data is processed and displayed in an eye readable format to tell an operator where to place a weight and how much the weight should be in order to correct the imbalance condition in the wheel.
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Gill James J.
Hofmann Corporation Automotive Service Equipment
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