Machinery's Handbook, 31st Edition
2446
Ball and Roller Bearings Table 1b. Types of Rolling Element Bearings and Their Symbols BALL BEARINGS, DOUBLE ROW, RADIAL CONTACT
Symbol
Description
Symbol
Description
BF Filling slot assembly
BHA Non-separable two-piece outer ring
BK
Non-filling slot assembly
BALL BEARINGS, DOUBLE ROW, ANGULAR CONTACT a
Symbol
Symbol
Description
Description
Filling slot assembly Vertex of contact angles inside bearing Filling slot assembly Vertex of contact angles outside bearing Non-filling slot assembly Vertex of contact angles inside bearing
Non-filling slot assembly Vertex of contact angles outside bearing Non-separable Vertex of contact angles inside bearing Two-piece outer ring Separable Vertex of contact angles outside bearing Two-piece inner ring
BD
BG
BAA
BE
BVV
BJ
BALL BEARINGS, DOUBLE ROW, SELF-ALIGNING a Symbol Description
BS Raceway of outer ring spherical a A line through the ball contact points forms an acute angle with a perpendicular to the bear- ing axis. Single-row Angular-contact: This type is designed for combined radial and thrust loads where the thrust component may be large and axial deflection must be confined within very close limits. A high shoulder on one side of the outer ring is provided to take the thrust, while the shoulder on the other side is only high enough to make the bearing non- separable. Except where used for a pure thrust load in one direction, this type is applied either in pairs (duplex) or one at each end of the shaft, opposed. Double-row Bearings: These are, in effect, two single-row angular-contact bearings built as a unit with the internal fit between balls and raceway fixed at the time of bearing assembly. This fit is therefore not dependent upon mounting methods for internal rigidity. These bearings usually have a known amount of internal preload built in for maximum resistance to deflection under combined loads with thrust from either direction. Thus, with balls and races under compression before an external load is applied, due to this internal preload, the bearings are very effective for radial loads where bearing deflection must be minimized. Other Types: Modifications of these basic types provide arrangements for self-sealing, location by snap ring, shielding, etc., but the fundamentals of mounting are not changed. A special type is the self-aligning ball bearing which can be used to compensate for an appreciable degree of misalignment between shaft and housing due to shaft deflections,
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