Needle Roller Bearing

How to choose Rolling Bearings

Points to check when selecting, with the values for this product (Needle Roller Bearing).

1. 1. Main dimensions matching shaft diameter and housing

   The bore diameter d is determined by the shaft diameter, while the outside diameter D and width B are determined by the housing bore diameter and mounting space. Main dimensions are standardized under JIS/ISO series, which makes replacement with interchangeable products easier. For tapered roller bearings, also check the assembled width T and outer ring width C; for thrust bearings, also check the height H.

2. 2. Check dynamic load rating against required life

   The basic dynamic load rating Cr is the reference value for calculating rolling fatigue life during rotation. Calculate the rated life from the actual applied load and rotational speed, and confirm that the required life is met. Roller bearings have a larger Cr than ball bearings of the same dimensions and are suited to heavy loads.

3. 3. Check static load rating for stationary or shock loads

   In applications involving low-speed rotation, oscillation, or shock loads while stopped, permanent deformation (indentations) may remain on the raceway surfaces. Therefore, check the safety factor using the ratio of the basic static load rating C0r to the maximum load.

4. 4. Combination of rotational speed and lubrication method

   The limiting speed differs between grease lubrication and oil lubrication. Confirm that the operating speed has sufficient margin using the value for the lubrication method adopted. At higher speeds, the cage material, guide method, and accuracy grade also affect rotational performance.

5. 5. Handling load direction and shaft misalignment

   If axial loads (loads in the shaft direction) are also applied, check the contact angle of angular contact ball bearings or tapered roller bearings. The larger the contact angle, the greater the capacity to accept axial loads. If the shaft deflects or there are mounting errors, check the permissible misalignment angle of self-aligning types.

6. 6. Materials for high-temperature, vacuum, and corrosive environments

   In high-temperature, vacuum, or chemical-exposed environments, common combinations of steel and grease may not be usable. Therefore, confirm the operating temperature range and atmospheric pressure, then select the rolling element material and cage material accordingly. Options include ceramics, stainless steel, solid lubricants, and fluorine grease.

This guide was written by AI based on the listed products' documents and specification items.

About Rolling Bearings and all products

Description

Available in inner ring types (with inner ring and without inner ring) and shell type and solid type designs. Used in automotive engines, transmissions, pumps, construction machinery, rolling mill roll necks, and similar applications.

FAQ

Q. In what situations can needle roller bearings (solid type and shell type) be used?

A. They are used in applications such as automotive engines, transmissions, pumps, construction machinery, and rolling mill roll necks.

Q. Are needle roller bearings (solid type and shell type) suitable for cases where installation space is limited?

A. Yes. They are a bearing with a small cross-sectional height that uses thin needle rollers and can withstand large radial loads in limited installation space. A key feature is their small installation space requirement.

Q. What types of needle roller bearings (solid type and shell type) are available?

A. They are available with inner ring and without inner ring, and in shell type and solid type designs. In the type without inner ring, the shaft can be used as the raceway surface.

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

Source documents

• Catalog 転がり軸受 総合カタログ Open page 7
  Found on: https://koyo.jtekt.co.jp/products/exsev/