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Tapered Roller Bearings

Tapered roller bearings are rolling bearings in which tapered rollers are placed between the conical raceways of the inner ring (cone) and outer ring (cup). Line contact between rollers and raceways gives high load capacity, allowing simultaneous acceptance of radial load and one-directional axial load. The larger the contact angle, the higher the axial load capacity. Single-row types are used in pairs in back-to-back or face-to-face arrangement to adjust preload or clearance. Other types include double-row (TDI, TDO, etc.) and four-row (TQO) designs, used in heavy-load sections of rolling mills and mining machinery. Dimensions are available in metric and inch series, and low-torque types with reduced friction torque are offered for automotive differentials.

How to choose Tapered Roller Bearings

  1. 1. Dimension series matching shaft and housing

    Bore d matches the shaft diameter and outside diameter D matches the housing bore. Tapered roller bearings come in metric and inch series, and bearings of similar size are not interchangeable. When replacing bearings in existing machinery, confirm the series of the boundary dimension designation, and check inner ring width B and outer ring width C against the step dimensions of the mounting section.

  2. 2. Managing preload with assembled width T and tolerance

    Width T is the overall width of the inner and outer rings when assembled, and it affects axial mounting dimensions and the adjustment amount for preload or clearance. The assembled width tolerance class changes the effort required for adjustment, so when used in pairs, confirm T and its tolerance class.

  3. 3. Estimating life with basic dynamic load rating

    Basic dynamic load rating Cr is the basis for life calculation. From radial and axial loads, the dynamic equivalent load is obtained using factor e and load factor Y1, and rated life is calculated from the ratio to Cr. The listed Cr values range from 9.5 kN to several tens of thousands of kN and vary greatly with the number of rows.

  4. 4. Checking shock and low-speed use with static load rating

    For applications with stationary operation, very low speed, or shock loads, check the margin against permanent deformation using the ratio of basic static load rating C0r to the static equivalent load (calculated with Y0). For heavy-duty rolling mills and similar uses, secure capacity with double-row or four-row types.

  5. 5. Determining shaft support by load action point position

    Tapered roller bearings have load action points located away from the end face, and the span between supports changes depending on back-to-back or face-to-face arrangement. Use the load action point position a for calculating shaft deflection and reaction forces, and determine the mounting direction accordingly.

  6. 6. Matching rotational speed and lubrication method

    The permissible rotational speed is set higher for oil lubrication than for grease lubrication. Confirm that the operating speed is within the value for each lubrication method. For differentials and other applications where energy saving is required, low-torque types showing the friction torque reduction rate are also candidates.

This guide was written by AI based on the listed products' documents and specification items. Check each manufacturer's documents before adopting.