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Ackermann steering geometry
Arrangement of steering linkages / From Wikipedia, the free encyclopedia
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This article is about steering geometry. For other uses, see Ackermann (disambiguation).
The Ackermann steering geometry is a geometric arrangement of linkages in the steering of a car or other vehicle designed to solve the problem of wheels on the inside and outside of a turn needing to trace out circles of different radii.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/a/a0/Ackermann_turning.svg/320px-Ackermann_turning.svg.png)
It was invented by the German carriage builder Georg Lankensperger in Munich in 1816, then patented by his agent in England, Rudolph Ackermann (1764–1834) in 1818 for horse-drawn carriages. Erasmus Darwin may have a prior claim as the inventor dating from 1758.[1] He devised his steering system because he was injured when a carriage tipped over.