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<p>interwiki link (which was visible in article for some reason) removed.</p> <p><b>New page</b></p><div>[[Image:Needle bearing.jpg|thumb|A needle roller bearing]]<br /> <br /> A '''needle roller bearing''' is a special type of [[roller bearing]] which uses long, thin [[Cylinder (geometry)|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.&lt;ref&gt;{{cite book|last1=Avallone|first1=Eugene|last2=Baumeister|first2=Theodore|last3=Sadegh|first3=Ali|title=Marks' Standard Handbook for Mechanical Engineers|date=2007|publisher=McGraw-Hill|location=New York|isbn=0071428674|edition=11th}}&lt;/ref&gt; Like all [[bearing (mechanical)|bearing]]s, they are used to reduce the [[friction]] of a rotating surface.<br /> <br /> Compared to [[ball bearing]]s and ordinary roller bearings, needle bearings have a greater surface area in contact with the [[race (bearing)|race]]s, so they can support a greater load. They are also thinner, so they require less [[Engineering tolerance#Mechanical component tolerance|clearance]] between the [[axle]] and the surrounding structure.<br /> <br /> Needle bearings are heavily used in automobile components such as [[rocker arm]] pivots, [[pump]]s, [[Gas compressor|compressors]], and [[Transmission (mechanics)|transmissions]]. The [[Driveshaft|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 [[Grade (slope)|slopes]].<br /> <br /> ==See also==<br /> * [[Race (bearing)]]<br /> * [[Tapered roller bearing]]<br /> <br /> == References ==<br /> {{Reflist}}<br /> <br /> <br /> [[Category:Rolling-element bearings]]<br /> <br /> {{mech-engineering-stub}}</div>

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