Measuring and testing – Rotor unbalance – Dynamic
Patent
1982-08-10
1985-03-05
Gill, James J.
Measuring and testing
Rotor unbalance
Dynamic
364508, G01M 122
Patent
active
045023280
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 freewheeling during measurement and is brought up to a predetermined minimum r.p.m. value through a motor and clutch arrangement. 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 measured force components are converted into digital form. 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. Also forming part of the wheel balancer is a device for compensating for velocity variation taking place during the freewheeling rotation of the main shaft. The compensated 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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Dyke Mark Van
Wood John F.
Gill James J.
Hofmann Corporation Automotive Service Equipment
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