(NL) heugel met rondsel, heugel en tandwiel
(PT) cremalheira e pinhão
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiU5M_eFh5RGHneawLiBMJCBc-SRo9t0dZExxSLNomeCuPdLchP7SA8Bqe9BIyOKqQQzd37GxjXCdJMe3digHyeKgCqZAOV7ZbNbH5G-qIg9CMtwl-00SjWUA66p2cCkJaGc2FLwBBXfM7d/s320/Rack_and_pinion_animation.gif)
A rack and pinion is a pair of gears which convert rotational motion into linear motion. The circular pinion engages teeth on a flat bar - the rack. Rotational motion applied to the pinion will cause the rack to move to the side, up to the limit of its travel. For example, in a rack railway, the rotation of a pinion mounted on a locomotive or a railcar engages a rack between the rails and pulls a train along a steep slope.
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