Machinery's Handbook, 31st Edition
Ball and Roller Bearings 2447 mounting inaccuracies, or other causes commonly encountered. With a single row of balls, alignment is provided by a spherical outer surface on the outer ring; with a double row of balls, alignment is provided by a spherical raceway on the outer ring. Bearings in the wide series have a considerable amount of thrust capacity. Table 1c. Types of Rolling Element Bearings and Their Symbols CYLINDRICAL ROLLER BEARING, SINGLE ROW, NON-LOCATING TYPE Symbol Description Symbol Description
Double-ribbed inner ring Outer ring without ribs Outer ring separable Spherical outside surface Inner ring without ribs Single-ribbed outer ring Both rings separable Inner ring without ribs Rollers located by cage, end-rings or internal snap rings recesses in outer ring Inner ring separable
Inner ring without ribs Double-ribbed outer ring Inner ring separable Inner ring without ribs Double-ribbed outer ring with one loose rib Both rings separable Inner ring without ribs Double-ribbed outer ring Inner ring separable Spherical outside surface Double-ribbed inner ring Outer ring without ribs Outer ring separable
RU
RNS
RUP
RAB
RUA
RM
Inner ring without ribs Outer ring without ribs Both rings separable
RN
RNU
CYLINDRICAL ROLLER BEARINGS, SINGLE ROW, ONE-DIRECTION-LOCATING TYPE
Symbol
Description
Symbol
Description
Single-ribbed inner-ring Outer ring with two internal snap rings Inner ring separable Single-ribbedinner ring Double-ribbed outer ring Inner ring separable Single-ribbed inner ring Double-ribbed outer ring with one loose rib Both rings separable
Double-ribbed inner ring Single-ribbed outer ring Outer ring separable Single-ribbed inner ring Outer ring with one rib and one internal snap ring Inner ring separable Single-ribbed inner ring Single-ribbed outer ring Both rings separable
RR
RF
RJ
RS
RJP
RAA
Types of Roller Bearings.— Types of roller bearings are distinguished by the design of rollers and raceways to handle axial, combined axial and thrust, or thrust loads. Cylindrical Roller: These bearings have solid or helically wound hollow cylindrical roll- ers. The free ring may have a restraining flange to provide some restraint to endwise move - ment in one direction or may be without a flange so that the bearing rings may be displaced axially with respect to each other. Either rolls or roller path on the races may be slightly crowned to prevent edge loading under slight shaft misalignment. Low friction makes this type suitable for relatively high speeds. Barrel Roller: These bearings have rollers that are barrel-shaped and symmetrical. They are furnished in both single- and double-row mountings. As with cylindrical roller bear ings, the single-row mounting type has a low thrust capacity, but angular mounting of rolls in the double-row type permits its use for combined axial and thrust loads.
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