Overview
Tapered roller bearings are designed so that the imagined conical apices formed by the raceways of the inner and outer rings and the rollers all converge at one point on the bearing axis. The trapezoidal tapered rollers used as the rolling elements are guided by a large rib on the inner ring.
These bearings can take radial loads and axial loads in one direction. When load is applied, the axial component generated inside the bearing generally requires the use of two opposed bearings (similar to angular contact ball bearings) or double-row bearings. Spacers are used to adjust the inner and outer rings in the axial direction to achieve the proper internal clearance. Since they are separable, the inner ring (cone) assemblies and outer rings (cups) can be mounted independently.
The HR Series increases both the size and number of rollers for even higher load capacity.
Tapered roller bearings are divided by their contact angle into normal-, medium-, and steep-angle types. In addition to double-row types, four-row tapered roller bearings are also available. Pressed cages are generally used, though large bearings may utilize pin-type cages.
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Product List
Metric Series Tapered Roller Bearings
Metric Series Tapered Roller Bearings
Metric series medium- and steep-angle tapered roller bearings use contact angle code “C” or “D” respectively after the bore number, while no code is used with normal-angle bearings. Medium-angle tapered roller bearings are primarily used for the pinion shafts of differential gears in automobiles.
Bearings in the high-load capacity HR Series with “J” after the basic designation conform to ISO specifications for outer ring width, outer ring raceway small end diameter, and contact angle. This makes the inner ring (cone) assemblies and outer rings (cups) of these bearings internationally interchangeable with those having the same basic designation.
Some metric-design tapered roller bearings specified by ISO 355 have new dimensions different than those used in previous 3XX dimension series. For more information, please see the catalog bearing tables.
Bearing designations are structured as follows (note this has changed from past Metric Series):
Inch Series Tapered Roller Bearings
Inch Series Tapered Roller Bearings
Tapered roller bearings also come in inch series specifications. The designations of inner ring assemblies and outer rings of inch design bearings (excluding four-row tapered roller bearings) are formulated differently:
In tapered roller bearings, the outer ring is sometimes referred to as the “cup” and the inner ring assembly as the cone. These are sometimes called “sub-units”, with a single bearing referred to as the “unit”.
Bearing designations are formed with the code for the inner ring assembly (cup) first, followed by the code for the outer ring (cone).
Double-Row Tapered Roller Bearings
Double-Row Tapered Roller Bearings
The design and features of tapered roller bearing arrangements and double-row roller bearings are as shown:
Features
- Support all types of loads
Tapered roller bearings can take moment loads, axial loads, and radial loads in any direction. - High rigidity with high load capacity TRBs are especially suited for applications requiring moment rigidity. Applying a preload can increase rigidity even further.
Applications
- Gearboxes for industrial machinery, roller shaft support (roll necks), cantilevel wheel axles
FAQ
- How are angular contact ball bearings (ACBBs) different from tapered roller bearings (TRBs)?
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- TRBs provide higher load capacity and rigidity than ACBBs. However, ACBBs can offer rotation at higher speeds than TRBs.
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