Needle roller bearing

A needle roller bearing

A needle roller bearing is a bearing which uses small cylindrical rollers. They are used to reduce friction of a rotating surface.

Needle bearings have a large surface area that is in contact with the bearing outer surfaces compared to ball bearings. Additionally there is less added clearance (difference between the diameter of the shaft and the diameter of the bearing) so they are much more compact. The typical structure consists of an a needle cage which orients and contains the needle rollers, the needle rollers themselves, and an outer race(sometimes housing itself).

Radial needle bearings are cylindrical and use rollers parallel to the axis of the shaft. Thrust needle bearings are flat and use a radial pattern of needles.

Full compliment bearings have solid inner and outer rings and rib-guided cylindrical rollers. Since these bearings have the largest possible number of rolling elements, they have extremely high radial load carrying capacity and are suitable for particularly compact designs. ^[1]

Needle bearings are heavily used in engine components such as rocker arm pivots, pumps, compressors, and transmissions. The drive shaft of a rear-wheel drive vehicle typically has at least 8 needle bearings (4 in each U joint) and often more if it is particularly long, or operates on steep slopes.

Additional clarification of Needle Roller: According to "Marks' Standard Handbook for Mechanical Engineers", a Needle Bearing is a roller bearing with rollers whose length are at least four times their diameter.

1. ^ [1] Timken bearings website

See also

• Race (bearing)
• Schaeffler Group
• SKF Group
• Timken Company and former Torrington Company

External links

• http://www.bearings.machinedesign.com/guiEdits/Content/BDE_6_4/bdemech_a02.aspx
• Reliable source of Needle roller bearings in aftermarket solution.

This article about a mechanical engineering topic is a stub. You can help Wikipedia by expanding it.v · cz:Jehlové ložisko Wikimedia Foundation. 2010. Игры ⚽ Нужен реферат? IWeb Linear-motion bearing Look at other dictionaries: needle roller-bearing — noun A roller bearing without a cage, in which long rollers of small diameter are used, located endwise by a lip on the inner or outer race • • • Main Entry: ↑needle …   Useful english dictionary roller bearing — Mach. 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] * * * One of the two types of rolling, or antifriction,… …   Universalium roller bearing — noun bearings containing small metal balls • Syn: ↑ball bearing, ↑needle bearing • Hypernyms: ↑bearing …   Useful english dictionary Bearing (mechanical) — A bearing is a device to allow constrained relative motion between two or more parts, typically rotation or linear movement. Bearings may be classified broadly according to the motions they allow and according to their principle of operation as… …   Wikipedia bearing — [1] The area of a unit in which the contacting surface of a revolving part rests in order to minimize wear and friction between two surfaces. [2] An antifriction reducing device that is usually found between two moving parts. The babbitt bearings …   Dictionary of automotive terms needle bearing — noun bearings containing small metal balls • Syn: ↑ball bearing, ↑roller bearing • Hypernyms: ↑bearing * * * noun : a roller bearing with very slender rollers varying typically from 0.08 to 0.16 inch in diameter …   Useful english dictionary bearing — Synonyms and related words: Zeitgeist, action, actions, activity, acts, address, affectation, affective meaning, aftermath, aim, air, air express, airfreight, airlift, applicability, application, appositeness, aspect, asportation, attitude, axis …   Moby Thesaurus Roller rocker — A roller rocker is a rocker assembly that uses bearings instead of metal sliding on metal.A cam/rocker assembly uses a normal cam, but the rocker has a wheel on the end of it like that of a measuring wheel, which rolls by the use of needle roller …   Wikipedia needle bearing — noun A type of roller bearing in which the load bearing elements are longish, thin, cylindrical pins …   Wiktionary Wheel bearing — The term wheel bearing may refer to any one of the following:*A Ball bearing *A Bearing (mechanical) *A Bushing *A Fluid bearing *A Jewel bearing *A Journal bearing *A Needle roller bearing *A Plain bearing *Any Rolling element bearing *A Self… …   Wikipedia 18+ © Academic, 2000-2024 Contact us: Technical Support, Advertising Dictionaries export, created on PHP, Joomla, Drupal, WordPress, MODx. Mark and share Search through all dictionaries Translate… Search Internet Share the article and excerpts Direct link … Do a right-click on the link above and select “Copy Link”