tapered roller bearings

The inner and outer ring raceways are segments of cones and the rollers are tapered so that the conical surfaces of the raceways, and the roller axes, if projected, would all meet at a common point on the main axis of the bearing. This geometry makes the motion of the cones remain coaxial, with no sliding motion between the raceways and the OD of the rollers.

This conical geometry creates a linear contact patch which permits greater loads to be carried than with spherical (ball) bearings, which have point contact. The geometry means that the tangential speeds of the surfaces of each of the rollers are the same as their raceways along the whole length of the contact patch and no differential scrubbing occurs.

The rollers are stabilized and restrained by a flange on the inner ring, against which their large end slides, which stops the rollers from popping out due to the "pumpkin seed effect" of their conical shape.The larger the half angles of these cones the larger the axial force that the bearing can sustain.

Bearing Number	Bore Dia	Outer DIa	Width	Size
55 mm x 90 mm x 54 mm SKF BTH-1215AD tapered roller bearings	68/800	800x980x82	800,000	980,000
120 mm x 215 mm x 40 mm NTN 30224U tapered roller bearings	6702	15x21x4	15	21
38,1 mm x 69,012 mm x 19,05 mm Timken 13685/13620 tapered roller bearings	67/2,5ZZA	2.5x5x2.3	2,5	5
Timken NP293601/NP934397 tapered roller bearings	5S-2LA-BNS919LLBG/GNP42	95x130x18	95	130
KOYO 47TS815533A tapered roller bearings	68/950	950x1150x90	950,000	1150,000
63,5 mm x 122,238 mm x 38,354 mm NSK HM212047/HM212010 tapered roller bearings	629-C	9x26x8	9	26
63,5 mm x 127 mm x 36,512 mm Timken HM813842A/HM813810 tapered roller bearings	6706LLF	30x37x4	30	37
Toyana HM907643/14 tapered roller bearings	68/850	850x1030x82	850	1030
45,618 mm x 82,931 mm x 25,4 mm ISB 25590/25520 tapered roller bearings	6703	17x23x4	17	23
36 mm x 72 mm x 18,5 mm Gamet 102036/102072 tapered roller bearings	6913NR	65x90x13	65	90
139.700 mm x 241.300 mm x 56.642 mm NACHI 82550/82950 tapered roller bearings	6812-2RU	60x78x10	60	78
80,962 mm x 139,7 mm x 36,098 mm NSK 581/572X tapered roller bearings	NNU4922 V	110x150x40	110	150