rack and pinion


rack and pinion
Mach., Auto.
See under rack1 (def. 5a).

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Mechanical device consisting of a bar of rectangular cross section (the rack), having teeth on one side that mesh with teeth on a small gear (the pinion).

If the pinion rotates about a fixed axis, the rack will move in a straight path. Some automobile steering mechanisms have rack-and-pinion drives that use this principle. If the rack is fixed and the pinion is carried in bearings on a table guided on tracks parallel to the rack, rotation of the pinion shaft will move the table parallel to the rack. On machine tools, this principle is used to obtain rapid movements of worktables.

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      mechanical device consisting of a bar of rectangular cross section (the rack), having teeth on one side that mesh with teeth on a small gear (the pinion). The pinion may have straight teeth, as in the figure, or helical (twisted) teeth that mesh with teeth on the rack that are inclined to the pinion-shaft axis.

 If the pinion rotates about a fixed axis, the rack will translate; i.e., move on a straight path, as shown by the arrow AB in the Figure—>. Some automobiles have rack-and-pinion drives on their steering mechanisms that operate in this way.

      If the rack is fixed and the pinion is carried in bearings on a table guided on tracks parallel to the rack, rotation of the pinion shaft will move the table parallel to the rack as shown by the arrow CD in the Figure. On machine tools, rack-and-pinion mechanisms are used in this way to obtain rapid movements of worktables; the pinion shaft is usually rotated with a hand crank.

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Universalium. 2010.

Look at other dictionaries:

  • rack-and-pinion — [rak΄ən pin′yən] adj. designating or of an automotive steering system having a RACK1 (n. 5) and a pinion …   English World dictionary

  • rack-and-pinion — ► ADJECTIVE ▪ denoting a mechanism using a fixed cogged or toothed bar or rail engaging with a smaller cog …   English terms dictionary

  • Rack and pinion — 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… …   Wikipedia

  • rack-and-pinion — /rak euhn pin yeuhn/, adj. of or pertaining to a mechanism in which a rack engages a pinion: rack and pinion steering. See illus. under rack1. [1900 05] * * * ˌrack and ˈpinion 7 [rack and pinion] adjective only before noun using a piece of… …   Useful english dictionary

  • rack and pinion — noun a wheel gear (the pinion) meshes with a toothed rack; converts rotary to reciprocating motion (and vice versa) • Hypernyms: ↑gear, ↑gear wheel, ↑geared wheel, ↑cogwheel * * * Mach., Auto. See under rack1 ( …   Useful english dictionary

  • rack-and-pinion — /rak euhn pin yeuhn/, adj. of or pertaining to a mechanism in which a rack engages a pinion: rack and pinion steering. See illus. under rack1. [1900 05] * * * …   Universalium

  • rack and pinion — See rack and pinion gearbox …   Dictionary of automotive terms

  • rack and pinion — rack′ and pin′ion n. aum mac See under rack I, 5), a) …   From formal English to slang

  • rack-and-pinion — /ræk ən ˈpɪnjən / (say rak uhn pinyuhn) noun 1. a system for the conversion of rotary to linear motion and vice versa, consisting of a pinion and a mated rack (rack1 def. 4). –adjective 2. of, using, or comprising such a system …   Australian English dictionary

  • rack and pinion — noun A pair of gears, consisting of a circular pinion that engages with the teeth of a flat bar, that converts rotational into linear motion; used in the steering mechanism of cars, and in some railways …   Wiktionary


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