Crown Wheel And Pinion (Ring And Pinion)
The crown wheel and pinion are the main gear set in a differential, turning drive by 90 degrees and reducing speed.
What is Crown Wheel And Pinion (Ring And Pinion)?
Their ratio is the final drive ratio. They are machined as a matched pair. They run in gear oil. When a differential is rebuilt, the backlash and contact pattern are checked with marking paste. Changing to a different ratio requires a matched set and correct setup.
How it works
The small pinion turns the large crown wheel.
Why it matters for your car
Whine at certain speeds can mean wear. Setup needs precise shims.
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