Variable Ratio (VR) steering system

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Bishop VR rack

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Honda VSA (Vehicle Stability Assist) rack

Curved teeth on VR racks
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Daimler Direktlenkung

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ActivRak VR-rack details

Rack tooth surface has to be adjusted in order to achieve variable ratio. 
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US3753378

FIG. 8 is a sectional view to a very much enlarged scale of the rack and pinion of FIG. 5a showing the particular features of contact between the rack and the pinion being a section through the centerline of the rack;

FIG. 9 is a plan view in diagrammatic form of the pinion and the rack showing the position of various section lines referred to in the description;

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