A needle roller bearing is a special type of roller bearing which uses long, thin cylindrical rollers resembling needles. Ordinary roller bearings' rollers are only slightly longer than their diameter, but needle bearings typically have rollers that are at least four times longer than their diameter.[1] Like all bearings, they are used to reduce the friction of a rotating surface.
A needle roller bearing
Compared to ball bearings and ordinary roller bearings, needle bearings have a greater surface area in contact with the races, so they can support a greater load. They are also thinner, so they require less clearance between the axle and the surrounding structure.
Needle bearings are heavily used in automobile components such as rocker arm pivots, pumps, compressors, and transmissions. The drive shaft of a rear-wheel drive vehicle typically has at least eight needle bearings (four in each U joint) and often more if it is particularly long, or operates on steep slopes.[2]
^Avallone, Eugene; Baumeister, Theodore; Sadegh, Ali (2007). Marks' Standard Handbook for Mechanical Engineers (11th ed.). New York: McGraw-Hill. ISBN978-0071428675.
needle, roller, bearing, needle, roller, bearing, special, type, roller, bearing, which, uses, long, thin, cylindrical, rollers, resembling, needles, ordinary, roller, bearings, rollers, only, slightly, longer, than, their, diameter, needle, bearings, typicall. A needle roller bearing is a special type of roller bearing which uses long thin cylindrical rollers resembling needles Ordinary roller bearings rollers are only slightly longer than their diameter but needle bearings typically have rollers that are at least four times longer than their diameter 1 Like all bearings they are used to reduce the friction of a rotating surface A needle roller bearingCompared to ball bearings and ordinary roller bearings needle bearings have a greater surface area in contact with the races so they can support a greater load They are also thinner so they require less clearance between the axle and the surrounding structure Needle bearings are heavily used in automobile components such as rocker arm pivots pumps compressors and transmissions The drive shaft of a rear wheel drive vehicle typically has at least eight needle bearings four in each U joint and often more if it is particularly long or operates on steep slopes 2 See also editRace bearing Tapered roller bearingReferences edit Avallone Eugene Baumeister Theodore Sadegh Ali 2007 Marks Standard Handbook for Mechanical Engineers 11th ed New York McGraw Hill ISBN 978 0071428675 SKF RNA6917 Needle Bearings 100x120x63 mm bearingbasement com www bearingbasement com Retrieved 2023 06 08 nbsp This article about a mechanical engineering topic is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Needle roller bearing amp oldid 1168603411, wikipedia, wiki, book, books, library,
