Type of roller bearing which uses long, thin cylinders as rollers
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.
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. ISBN 978-0071428675.
A needlerollerbearing is a special type of rollerbearing which uses long, thin cylindrical rollers resembling needles. Ordinary roller bearings' rollers...
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INA in Herzogenaurach. 1949: The needleroller cage, developed by Georg Schaeffler, makes the needlerollerbearing a reliable component for industrial...
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the valve by moving it downwards. A roller rocker is a rocker arm that uses needle bearings (or a single bearing ball in older engines) at the contact...
patterns along the bearing races, resembling the primary elements of the bearing, such as rows of indented lines for needle or roller bearings or rounded...
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p. 77. Roller (2010), pp. 91–92. Roller (2010), p. 92. Roller (2010), pp. 92–93. Roller (2010), pp. 93–94. Roller (2010), pp. 94, 142. Roller (2010),...
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[citation needed]. The 360 degrees crankshaft uses three roller bearings and a ball bearing. The camshaft uses four ball bearings, and rolling bearings...
injector components, camshaft lobes, hydraulic cylinder rods, bearing races, needlerollers, and sharpening stones and wheels. It has been proven that superfinishing...
engine with the ball bearing timing side main bearing, roller drive side and strengthened crankcases, larger oil pump and needleroller gearbox layshaft bearings...