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Variable Ratio Rack and Pinion
In a variable ratio (VR) steering mechanism, the rack-and-pinion gearset has a different tooth pitch in the center than it has on the outside.
Such mechanism is used in the automotive industry:
“The steering rack features a normal gear ratio near the straight ahead position with the steering ratio quickening as the steering wheel is turned farther. On the road this translates into smooth, confidence building high speed lane changes and increased maneuverability at lower speeds or when parking.”
— Honda Motor Company (Press release, July 2, 1997)