Ball and Roller Bearings Machinery's Handbook, 31st Edition
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Table 1a. Types of Rolling Element Bearings and Their Symbols BALL BEARINGS, SINGLE ROW, RADIAL CONTACT
Symbol
Description
Symbol
Description
BH Non-separable counter-bore assembly
BC
Non-filling slot assembly
BL Filling slot assembly
BM Separable assembly
BALL BEARINGS, SINGLE ROW, ANGULAR CONTACT a
Symbol
Description
Symbol
Description
Non-separable Nominal contact angle: from above 10 ° to and including 22 ° Separable outer ring Nominal contact angle: from above 10 ° to and including 22 ° Separable inner ring Nominal contact angle: from above 10 ° to and including 22 ° Non-separable Nominal contact angle: from above 22 ° to and including 32 °
Separable inner ring Nominal contact angle: from above 22 ° to and including 32 ° Non-separable Nominal contact angle: from above 32 ° to and including 45 °
BN
BAS
BNS
BT
BNT
BY Two-piece outer ring
BA
BZ Two-piece inner ring
BALL BEARINGS, SINGLE ROW, RADIAL CONTACT, SPHERICAL OUTSIDE SURFACE
Symbol
Description
Symbol
Description
BCA
Non-filling slot assembly
BLA Filling slot assembly
a A line through the ball contact points forms an acute angle with a perpendicular to the bear- ing axis. Types of Ball Bearings.— Most types of ball bearings originate from three basic designs: the single-row radial, the single-row angular contact, and the double-row angular contact. Single-row Radial, Non-filling Slot: This is probably the most widely used ball bearing and is employed in many modified forms. It is also known as the “Conrad” type or “Deep- groove” type. It is a symmetrical unit capable of taking combined radial and thrust loads in which the thrust component is relatively high, but is not intended for pure thrust loads, however. Because this type is not self-aligning, accurate alignment between shaft and housing bore is required. Single-row Radial, Filling Slot: This type is designed primarily to carry radial loads. Bearings of this type are assembled with as many balls as can be introduced by eccentric displacement of the rings, as in the non-filling slot type, and then several more balls are inserted through the loading slot, aided by a slight spreading of the rings and heat expan sion of the outer ring, if necessary. This type of bearing will take a certain degree of thrust when in combination with a radial load but is not recommended where thrust loads exceed 60 percent of the radial load.
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