초록 ▼

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 fr

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 through the use of a voltage controlled oscillator and a counter in conjunction with a timing wheel.

대표청구항 ▼

Apparatus for measuring unbalance in a vehicle wheel, said apparatus comprising: a drive shaft for carrying the vehicle wheel to be balanced; means for mounting the wheel to the drive shaft; transducer means for detecting at least one force indicative of an unbalance condition of the drive shaft; a

Apparatus for measuring unbalance in a vehicle wheel, said apparatus comprising: a drive shaft for carrying the vehicle wheel to be balanced; means for mounting the wheel to the drive shaft; transducer means for detecting at least one force indicative of an unbalance condition of the drive shaft; a voltage controlled oscillator responsive to said signal generated by said transducer means; a counter responsive to the output of said voltage controlled oscillator; means for sampling the counter at two points in time separated from each other by a predetermined time period; means for subtracting the two samples to determine the number of counts per predetermined time period; means for finding the coarse zero crossing points of the function resulting from the subtraction; means for interpolating between the coarse zero crossing points to determine the precise time of zero crossing; sampling means for sampling the counter at the precise zero crossing time and said predetermined time period away; and means for subtracting these two counter readings in order to provide the peak value of the transducer means.