Tapered Roller Bearings - Metric and Inch
Components
Tapered roller bearings are specialized roller bearings utilizing a separable cup and cone assembly to offer flexibility in design and installation as well as rigid performance.
Cup and Cone (Rings)
Often referenced as a cup and cone, tapered roller bearings use an outer ring and an inner ring assembly.. The outer ring on tapered roller bearings is known as the “cup” of the bearing while the assembly of the inner ring, rollers, and cage are called the “cone”. The inner ring assembly consists of a standard ring, a set of tapered rollers, and a cage.
Raceways
The raceways on these bearings are not parallel. Instead, the raceways are angled to allow for both radial and axial loading. To prevent the rollers from leaving the raceway, raceways are tapered allowing for the axis of rollers to be positioned in a way where their faces converge to a common point. To prevent the conical rollers from escaping this configuration, inner rings are outfitted with a flange to stabilize their rotation.
Application
With credit to the unique geometry of the conical rollers and their relatively large surface contact with the raceways, tapered roller bearings have a unique ability to perform under heavy axial and radial loads making them incredibly versatile bearings.
The technology and purpose of tapered roller bearings can be similarly matched to angular contact ball bearings.
Roller bearings:Radial roller bearings
These use rollers as the rolling elements and have a high load capacity. The rollers are guided by the ribs of the inner or outer ring. The inner and outer rings can be separated to facilitate assembly, and both can be fitted tightly.
On types with no ribs, either the inner or the outer ring can move freely in the axial direction, making cylindrical roller bearings ideal for use in free side bearings that absorb shaft expansion.
On types with ribs, the bearing can bear a slight axial load between the roller end surfaces and the ribs. Cylindrical roller bearings include the HT type that modifies the shape of roller end surfaces and ribs to increase axial load capacity, and the E type that has a special internal design to increase radial load capacity. The E type is standard for small-diameter sizes.
Roller Bearings: Cylindrical, Spherical, Tapered & Needle Rollers
Cylindrical roller bearings have higher radial capacity when compared to ball bearings. The most common types of cylindrical roller bearings are NJ, NU, NUP, NF and N. The NJ type and NF type will take some axial load in one direction only. The N type NU type will only take radial load with no axial load carrying capacity. The NUP type is designed to take some axial loading in both directions. The NN type and NNU type are double row designs and are also available, but less commonly used.
These bearings are typically used as the free or float bearing in an electric motor or in belt driven or non-direct coupled applications on the drive end of a motor, where heavy radial loads are prevalent.
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