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Illustration of a ring-and-pinion differential for a rear-wheel drive vehicle Schematic diagram of a ring-and pinion differential. A relatively simple design of differential is used in rear-wheel drive vehicles, whereby a ring gear is driven by a pinion gear connected to the transmission.
Larger ring and pinion versus the "14-bolt" axle, although the pinion lacks support bearings similar to the 14-bolt design. Selectable locking differential available on the 2014–present Ram Power Wagon. 11.8 AAM axle, optioned on Ram 3500 trucks with the High Output package
A pinion is a round gear and usually refers to the smaller of two meshed gears. Pitch angle. Angle relationships. Angles. Pitch Angle examples.
This ring and pinion is significantly stronger with a better pinion to ring gear tooth contact patch and angle. It was typically used in the back of jeep JKs, Isuzus and Nissan pickups. This ring and pinion does share some components and can be adapted into an earlier Dana 44 but requires some work, different bearings and spacers.
The hypoid gear places the pinion off-axis to the crown wheel (ring gear) which allows the pinion to be larger in diameter and have more contact area. In hypoid gear design, the pinion and gear are practically always of opposite hand, and the spiral angle of the pinion is usually larger than that of the gear.
In many cases, such as remote controlled toys, the pinion is also the drive gear for a reduction in speed, since electric motors operate at higher speed and lower torque than desirable at the wheels. However the reverse is true in watches, where gear trains commence with a high-torque, low-speed spring and terminate in the fast-and-weak escapement.
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