Rolling Contact Bearings

Rolling Contact Bearings - Rolling Contact Bearings Chapter...

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1 Rolling Contact Bearings Chapter 14 Rolling Contact Bearings • The purpose of a bearing is to support a load while permitting relative motion between two elements of a machine. • The term rolling contact bearings refers to the wide variety of bearings that use spherical balls or some other type of roller between the stationary and the moving elements. • The most common type of bearing supports a rotating shaft, resisting purely radial loads or a combination of radial and axial (thrust) loads. Rolling Contact Bearings con’t • The components of a typical rolling contact bearing are the inner race, the outer race, and the rolling elements.
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2 Types of Rolling Contact Bearings • Radial loads act toward the center of the bearing along a radius. • Such loads are typical of those created by power transmission elements on shafts such as spur gears, V-belt drives, and chain drives. • Thrust loads are those that act parallel to the axis of the shaft. Types of Rolling Contact Bearings • The axial components of the forces on helical gears, worms and wormgears, and bevel gears are thrust loads. • Misalignment refers to the angular deviation of the axis of the shaft at the bearing from the true axis of the bearing itself.
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3 Single-Row, Deep Groove Ball Bearing • The single-row, deep groove ball bearing is what most people think of when the term ball bearing is used. • The inner race is typically pressed on the shaft at the bearing seat with a slight interference fit to ensure that it rotates with the shaft. • The spherical rolling elements, or balls, roll in a deep groove in both the inner and outer races. • The spacing of the balls is maintained by retainers, or cages. Double-Row, Deep-Groove Ball Bearing • Adding a second row of balls increases the radial load-carrying capacity of the deep-groove type of bearing compared with the single-row design because more balls share the load.
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4 Angular Contact Ball Bearing • One side of each race in an angular contact bearing is higher to allow the accommodation of greater thrust loads compared with the standard single-row, deep-groove bearing.
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5 Cylindrical Roller Bearing • Replacing the spherical balls with cylindrical rollers with corresponding changes in the design of the races, gives a greater radial load capacity. • The resulting contact stress levels are lower than for equivalent-sized ball bearings, allowing smaller bearings to carry a given load or a given- size bearing to carry a higher load. • Thrust load capacity is poor because any thrust load would be applied to the side of the rollers, causing rubbing, not true rolling motion. Needle Bearing
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This document was uploaded on 11/21/2011.

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Rolling Contact Bearings - Rolling Contact Bearings Chapter...

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