Machinery's Handbook, 31st Edition
2448
Ball and Roller Bearings Table 1d. Types of Rolling Element Bearings and Their Symbols CYLINDRICAL ROLLER BEARINGS, SINGLE ROW, TWO-DIRECTION-LOCATING TYPE
Symbol
Description
Symbol
Description
Double-ribbed inner ring Outer ring with one rib and one internal snap ring Non-separable
Double-ribbed inner ring Outer ring with two internal snap rings Non-separable Double-ribbed inner ring Double-ribbed outer ring Non-separable Inner ring, with one rib and one snap ring Double-ribbed outer ring Non-separable Double-ribbed inner ring Double-ribbed outer ring with one loose rib Outer ring separable
RY
RK
RC
Double-ribbed inner ring Double-ribbed outer ring Non-separable Spherical outside surface
RCS
RG
Double-ribbed inner ring with one loose rib Double-ribbed outer ring Inner ring separable
RP
RT
CYLINDRICAL ROLLER BEARINGS
Double Row Non-Locating Type
Double Row Two-Direction-Locating Type
Symbol
Description
Symbol
Description
Three integral ribs on inner ring Outer ring without ribs, with two internal snap rings Non-separable
Inner ring without ribs Three integral ribs on outer ring Inner ring separable Three integral ribs on inner ring Outer ring without ribs Outer ring separable Inner ring without ribs Outer rings without ribs, with two internal snap rings Inner ring separable
RA
RB
Multi-Row Non-Locating Type
RD
Symbol
Description
Inner ring without ribs Double-ribbed outer ring (loose ribs) Both rings separable
RV
RE
Spherical Roller: These bearings are usually furnished in a double-row, self-aligning mounting. Both rows of rollers have a common spherical outer raceway. The rollers are barrel-shaped with one end smaller than the other to provide a small thrust to keep the roll ers in contact with the center guide flange. This type of roller bearing has a high radial and thrust load carrying capacity with the ability to maintain this capacity under some degree of misalignment of shaft and bearing housing. Tapered Roller: In this type, straight tapered rollers are held in accurate alignment by means of a guide flange on the inner ring. The basic characteristic of these bearings is that the apexes of the tapered working surfaces of both rollers and races, if extended, would coincide on the bearing axis. These bearings are separable. They have a high radial and thrust carrying capacity. Types of Ball and Roller Thrust Bearings.— Are designed to take thrust loads alone or in combination with radial loads. One-direction Ball Thrust: These bearings consist of a shaft ring and a flat or spherical housing ring with a single row of balls between. They are capable of carrying pure thrust loads in one direction only. They cannot carry any radial load. Two-direction Ball Thrust: These bearings consist of a shaft ring with a ball groove in either side, two sets of balls, and two housing rings so arranged that thrust loads in either direction can be supported. No radial loads can be carried.
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