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Tapered roller bearing are designed such that their conical rollers and raceways are so that all element of the roller and raceways cones meet at a common apex on the bearing axis. The rollers are guided by the contact between the large end of the roller and the rib on the inner ring (cone). This construction provides a high capacity for radial loads, axial loads and combined loads. The larger the contact angle, the greater the loading capacity becomes. When a pure radial is placed on the bearing, an induced load in the axial direction is also generated. So these bearings are generally used in pairs opposing each other. Proper running clearance or preload can be obtained by adjusting the distance of the two bearings against one another. Since the inner (cone)and outer (Cup) rings are separable, each ring can be mounted individually, allowing both rings to use tight fitting practices, if desired.

Both metric and inch systems are standardized by bearing series and both systems are widely used. The metric system’s specified in ISO (ISO 355) and JIS B 1512 and the inch system (including J series) is standardized in AFBMA standard.

Press Steel cages are generally used in these bearings, however large-size bearings use machined or pin types cages. Smaller sizes sometimes use plastic cages depending on the application.

Sub Units:
Tapered roller bearings can be disassembled into subunit, this is the inner ring with rollers (cone) and the outer rings (cup). The subunit dimensions are standardized on ISO and AFBMA standard, the unified subunits provide interchangeability within each dimensional standard. Furthermore, since high precision grade bearings are not interchangeable these bearings should be assembling subunits with the identical manufacturing number.

Regarding the single row tapered roller bearings described in the dimensional table, the dimensions for these subunits are standardized for both metric and inch systems (including J- series) unless otherwise noted.

Taper Roller bearings are generally separable, which means the cone assembly, consisting of the inner ring with roller and cage, can be mounted separately from the cup (outer ring). Being separable, mounting becomes easier. The projection lines of all the taper surfaces (Cup, Cone, and Roller) meet at a common point on the bearing axis, called the apex point, ensuring proper rolling motion of the roller on the track surfaces of cone and cup. NBC manufactures Single and Double Row Taper roller bearings in Inch and Metric series. These bearings are mainly used in Wheels, Transmissions and Axle Centres of Passenger Cars, MUVs, Trucks, Tractors, Earthmovers, etc. where RPM is moderate and combination loads (i.e. simultaneously both axial and radial loads) are prevalent.

Taper Roller Bearing Types And Characteristics:

Taper roller bearings can take both axial and radial loads. The axial load carrying capacity of the bearings is largely determined by the contact angle α as shown in the figure below. If the contact angle α is larger, then the axial load carrying capacity is higher and vice versa.

Taper roller bearings are designed in such a way that vertices of the cone for each roller and those for the inner and outer raceways coincides on the bearing axis or extensions of the raceways and rollers converge at a common point on the axis of rotation. This results in true rolling motion of the rollers on the raceways at every point along the rollers. The taper roller bearings support radial loads and axial loads from one direction only. The line contact between rollers and raceways provide the bearings with a high load carrying capacity.