driving pinion

driving pinion

[′drīv·iŋ ‚pin·yən]
(mechanical engineering)
The input gear in the differential of an automobile.
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References in periodicals archive ?
The gear teeth on the intermittent knotter gear then operates the disk driving pinion and turns the disk sufficiently to permit the twine holder to secure both strands of twine in the disk.
Ongoing maintenance and thorough re-lubrication at the main component interface, the large diameter bearing and the driving pinion of the gear mechanism are indispensable.