Measuring and testing – Rotor unbalance – Dynamic
Patent
1978-05-30
1979-12-11
Gill, James J.
Measuring and testing
Rotor unbalance
Dynamic
73487, G01M 116
Patent
active
041776780
ABSTRACT:
The invention relates to machines which determine the unbalance in a workpiece by rotating the workpiece and measuring the unbalance forces reacted into the machine frame. A drive arrangement is disclosed for rotating a spindle supporting the workpiece in such a machine for balancing vehicle wheels. The arrangement comprises a spindle housing for rotatably supporting the spindle and mounted on a base frame in a manner whereby the forces are reacted into a single direction and measured. The invention resides in the drive arrangement which includes speed changing means in the form of a worm gear on the spindle and a worm drive mounted on the spindle housing. A drive motor for driving the worm is mounted on the machine frame, that is, away from the spindle housing and drives the worm by means of a belt drive between a motor pulley and a pulley connected to the worm. The arrangement disclosed provides optimum isolation of forces occurring in the motor and drive and the speed changing means ensures that any spurious cyclical forces reacted into the single direction occur at a substantially different frequency to those being measured and are thus easily isolated electrically.
REFERENCES:
patent: 3140616 (1964-07-01), Hack
patent: 3152482 (1964-10-01), Federn
Gill James J.
Repco Limited
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