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BALL BEARING HOUSED UNITS<br />
WIDE-INNER-RING BALL BEARINGS • INTRODUCTION<br />
INTRODUCTION<br />
WIDE-INNER-RING BALL BEARING DESIGN FOR BALL<br />
BEARINGS THAT ARE EASILY MOUNTED ON STRAIGHT<br />
SHAFTS AND POSITIONED WITHOUT SHOULDERS,<br />
LOCKNUTS OR ADAPTERS<br />
The internal bearing construction is basically the same as the deep race, single-row radial type<br />
with the ability to carry radial, thrust and combined loads, while providing low-friction qualities.<br />
The inner ring is generally extended on both sides of the race to provide additional shaft support,<br />
and is locked to the shaft by specially designed set screws, an eccentric self-locking collar<br />
or a concentric collar. The wide-inner-ring ball bearings also are available with cylindrical or<br />
spherical outside diameters (O.D.). The cylindrical or straight O.D. type is used for mounting in<br />
straight-bored housings. The spherical O.D. type must be mounted in a corresponding spherical<br />
seat and is used to compensate for shaft or housing misalignments.<br />
WIDE-INNER-RING BALL BEARINGS<br />
WITH ECCENTRIC LOCKING COLLARS<br />
The following series are available with the eccentric cam (selflocking)<br />
collar. See installation instructions in table A-20 on<br />
page A-29.<br />
RR SERIES<br />
These bearings feature the flareout, contact-type R-seal which<br />
encloses a synthetic rubber-impregnated washer between two<br />
metal caps (fig. A-9). Most sizes incorporate the shroud-seal design.<br />
R-seal wide-inner-ring ball bearings are available in the following<br />
non-relubricatable variations: KR (one seal, cylindrical O.D.),<br />
KRR (two seals, cylindrical O.D.) and KRRB (two seals, spherical<br />
O.D.). Relubricatable versions are: G-KRR, G-KRRB and GN-KRRB<br />
(heavy-duty).<br />
RA-RR SERIES<br />
The RA-RR series features an extended inner ring and selflocking<br />
collar for simple and effective shaft retention in a<br />
standard-series bearing (fig. A-10). The positive contact, landriding<br />
R-seal provides improved protection against the heavy<br />
contamination encountered in many applications. All sizes<br />
have a heat-stabilized, moisture-conditioned 6/6 nylon retainer,<br />
which has proven effective under conditions of misalignment.<br />
RA-RR extended inner- ring bearings are available as RA-RR<br />
(two-seals, straight O.D.) and RA-RRB (two seals, spherical O.D.).<br />
Relubricatable versions are GRA-RR and GRA-RRB.<br />
Fig. A-9. RR series.<br />
Fig. A-10. RA-RR series.<br />
LL SERIES<br />
These bearings are dimensionally interchangeable with the RR<br />
series, but have non-contact labyrinth seals and steel cages for<br />
low torque, high speed and higher temperature service (up to<br />
177° C [350° F]).<br />
TIMKEN ® HOUSED UNIT CATALOG • Download 3D Models and 2D Drawings at cad.timken.com A-27
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