TDO Two-Row Double-Outer Race (Imperial)

Overview of TDO Bearings

TDO (Two-Row Double-Outer Race) (Imperial) tapered roller bearings consist of two single inner races (cones) and a one-piece double outer race (cup). This construction creates a wide effective bearing spread, improving stability under heavy loads, especially when overturning moments are present.

Design and Construction

• Outer Race: A single-piece double cup that ensures precise alignment and structural integrity.
• Inner Races: Two single cones mounted on the shaft, allowing for high radial and axial load capacities.
• Spacer (optional): In some applications, spacers between cones can be used to control internal clearance or preload.

Key Performance Features

• Wide bearing spread enhances moment load resistance and shaft stability.
• Ideal for applications involving high radial loads and axial loads in both directions.
• Capable of precise positioning or floating configurations depending on system design.

Applications

TDO bearings are widely used in heavy-duty equipment where reliability and load-handling capability are critical. Common applications include:

• Industrial gearboxes
• Rolling mills
• Mining and construction machinery
• Railroad axle boxes and wheel hubs

Mounting Flexibility

TDO bearings can be configured in two common ways:

1. Fixed Position: The bearing is secured axially, providing precise shaft positioning and stability under load.
2. Floating Position: The bearing is allowed to move axially within the housing bore to accommodate thermal expansion or shaft deflection, preventing internal stress buildup.

Benefits of TDO Bearings

• Improved support for overturning moments due to wide spacing of raceways
• Durable, compact design reduces installation complexity
• Proven reliability in demanding environments
• Available in a wide range of imperial sizes for compatibility with legacy equipment

Conclusion

TDO (Two-Row Double-Outer Race) (Imperial) tapered roller bearings are a preferred solution for engineers and manufacturers who require a robust bearing capable of handling high loads and resisting tipping forces. Their versatility in mounting and high performance make them ideal for both new designs and retrofit projects.