SKF Tapered Roller Bearing 30209

The inner and outer ring Rare Segments of cones and the rollers are taperedso 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 outside Diameter 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.

Tapered roller Bearings are Separable into a cone Assembly and a cup.

The Non-separable cone Assembly Consists of the inner ring, the rollers, and a cage that retains and evenly spaces the rollers.

The cup is simply the outer ring.