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needle bearing

- Apr 04, 2018 -

A needle roller bearing is a special types of roller bearing which uses long ,thin cylindrical rollers resembling needles .Ordinary rollers bearings's rollers are only slightly longer than their diameter,but needle bearing typically have rollers that are at least four times longer than thier diameter .Like all bearings, they are used to reduce the friction of a rotating surface.

Compared to ball bearing and ordiary roller bearing ,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 bearing 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 needles bearings(four in each U joint )and often more if it is particularly long or operates on steep slopes.

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