roller bearing

roller bearing
a bearing consisting of cylindrical or tapered rollers running between races in two concentric rings, one of which is mounted on a rotating or oscillating part, as a shaft.
[1855-60]

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One of the two types of rolling, or antifriction, bearings, the other being the ball bearing.

Like a ball bearing, a roller bearing has two grooved tracks, but the balls are replaced by rollers. The rollers may be cylinders or shortened cones. If the rollers are cylindrical, only radial loads (perpendicular to the axis of rotation) can be carried, but with conical rollers both radial and thrust, or axial, loads (parallel to the axis of rotation) can be carried. In a given space, a roller bearing can carry a greater radial load than a ball bearing can.

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▪ device
      one of the two members of the class of rolling, or so-called antifriction, bearings (the other member of the class is the ball bearing). Like a ball bearing, a roller bearing has two grooved tracks, or races, but the balls are replaced by rollers. The rollers may be cylinders or truncated cones. Only radial loads (i.e., loads perpendicular to the axis of rotation) can be carried when the rollers are cylindrical, but with conical rollers both radial and thrust, or axial, loads (i.e., ones parallel to the axis of rotation) can be carried. A needle bearing has cylindrical rollers that are relatively slender and completely fill the space between the races; in many cases the inner race is dispensed with. Because there is line contact between a roller and the races, while in a ball bearing there is point contact, in a given space a roller bearing can carry a greater radial load than a ball bearing.

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Universalium. 2010.

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Look at other dictionaries:

  • Roller bearing — Roll er bear ing (Mach.) A bearing containing friction rollers. [Webster 1913 Suppl.] …   The Collaborative International Dictionary of English

  • roller bearing — ☆ roller bearing n. a bearing in which the shaft turns with rollers, generally of steel, arranged in a ringlike track: used to reduce friction …   English World dictionary

  • roller bearing — A bearing using a series of straight, cupped, or tapered rollers engaging an inner and outer ring or race. See tapered roller bearing timken roller bearing …   Dictionary of automotive terms

  • roller bearing — noun a bearing similar to a ball bearing but using small cylindrical rollers instead of balls. ↘a roller used in such a bearing …   English new terms dictionary

  • roller bearing — noun bearings containing small metal balls • Syn: ↑ball bearing, ↑needle bearing • Hypernyms: ↑bearing …   Useful english dictionary

  • roller bearing — noun Date: 1857 a bearing in which the journal rotates in peripheral contact with a number of rollers usually contained in a cage …   New Collegiate Dictionary

  • roller bearing — noun A bearing, in which the load is carried by round (e.g. cylindrical or spherical) elements …   Wiktionary

  • roller bearing — roll′er bear ing n. mac a bearing that uses cylindrical rollers to prevent friction between machine parts • Etymology: 1855–60 …   From formal English to slang

  • roller-bearing — /roʊlə ˈbɛərɪŋ/ (say rohluh bairring) noun a bearing in which the shaft or journal protected by a metal sleeve turns upon a number of steel rollers running in an annular track …  

  • roller bearing — ring of small balls that is used to support an axis that revolves inside the ring …   English contemporary dictionary

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