Low-Torque Tapered Roller Bearing LFT-V (TRB-LFT Series)

Specifications

How to choose Tapered Roller Bearings

Points to check when selecting, with the values for this product (Low-Torque Tapered Roller Bearing LFT-V (TRB-LFT Series)).

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.

About Tapered Roller Bearings and all products

Description

Optimization of the labyrinth between the cage and inner/outer rings, the cage end face shape, and the oil flow inside the bearing reduces oil inflow and foreign matter, and improves lubrication of the inner ring flange by guiding oil to the large end face of the rollers. Oil retention grooves also enhance seizure resistance at low temperature and during start-up. The cage material usage is reduced by 60% compared with press-formed steel cage products.

FAQ

Q. By how much is the loss torque of the TRB-LFT Series (Low-Torque Tapered Roller Bearing LFT-V) reduced compared with the company's standard low-torque product?

A. Loss torque is reduced by 60% compared with the company's standard low-torque product.

Q. Can the TRB-LFT Series (Low-Torque Tapered Roller Bearing LFT-V) be used without changing peripheral components?

A. Yes, it enables low-torque design in a compact space without changing peripheral components.

Q. What measures are taken in the cage of the TRB-LFT Series (Low-Torque Tapered Roller Bearing LFT-V)?

A. The resin cage shape is optimized, including the labyrinth between the cage and inner/outer rings, the cage end face shape, and the oil flow inside the bearing. Cage material usage is reduced by 60% compared with press-formed steel cage products.

Q. Is the TRB-LFT Series (Low-Torque Tapered Roller Bearing LFT-V) resistant to seizure at low temperature or during start-up?

A. Yes. Oil retention grooves are provided, and seizure resistance under low temperature and oil-free conditions is 2.2 times higher.

Q. What has been improved for life in oil containing foreign matter for the TRB-LFT Series (Low-Torque Tapered Roller Bearing LFT-V)?

A. Life in foreign-matter-contaminated oil is twice as long. This is improved by reducing oil inflow and foreign matter.

Written by AI based on the content of the source documents.

Source documents

• Catalog 第5世代 低トルク円すいころ軸受 LFT-V Open page 1
  Found on: https://koyo.jtekt.co.jp/support/catalog-download/