Rolling Contact Bearings

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Presentation transcript:

Rolling Contact Bearings Rolling contact bearings: Load is transferred through elements in rolling contact. Also called anti-friction bearing due to its low friction characteristics. Advantage: Lower price, low maintenance, ease of operation Application: Extensively used Ball bearings Source: RAS Bearings and Industrial Components

Types of Rolling Contact Bearings Rolling bearings Types: Ball Bearings: Rolling elements are spherical balls Roller Bearings: Rolling elements are rollers (cylindrical or straight, tapered, spherical) Ball bearing Source: indiantradebird.com Straight roller globalcpec.com Tapered roller bearing Source: globalcpec.com Spherical roller bearing Source: SKF Ball Bearings: Can take radial and axial thrust load Straight Roller Bearings: Larger load capacity than ball bearings Zero misalignment required Can not take axial thrust

Types of Rolling Contact Bearings Ball bearing indiantradebird.com Straight roller globalcpec.com Tapered roller bearing Source: globalcpec.com Spherical roller bearing Source: SKF Ball Bearings: Lower load capacity, Can take radial and axial thrust load Straight Roller Bearings: Larger load capacity than ball bearings, Zero misalignment required Can not take axial thrust Tapered Roller Bearings: High load capacity, Some misalignment permitted, Load: Radial, axial thrust and combined radial and thrust Tapered Roller Bearings: Heavy load capacity, Large misalignment permitted, Increases contact area with increased load

Types of Rolling Contact Bearings Types of Ball Bearings: Types of Roller Bearings

Bearing Components Ball bearing Source: encyclopedia2.thefreedictionary.com

Bearing Assembly Bearing Assembly Source: Aggregates and Mining Today

This is for constant reliability R Bearing Life Load on Bearings: Fluctuation contact stress (on ball or roller, and the races) Failure Scenario: Fatigue (for proper lubrication, mounting, sealing, temperature and Dust control) Measure of Life: (1) Number of revolutions of inner ring with outer fixed before fatigue. (2) Hours of operation at constant angular speed before fatigue Fatigue Criterion: Pitting or spalling of an area 0.01 square inch (6.5 sq. mm) This is for constant reliability R

Bearing Selection Rated Load and Life: Provided in Manufacturer’s Catalog. Compare with desired load and life From Catalog select a bearing with rating FR or higher. This is for constant reliability R For 90 % reliability (R=0.9): (FR, , LR ) are called (C10, , L1o )