Poly Lube Needle Bearing

Specifications

How to choose Needle roller bearings

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

1. 1. Select dimensions by shaft diameter and presence of inner ring

   Types without an inner ring use the shaft directly as the raceway, so the roller pitch circle diameter Fw corresponds to the applicable shaft diameter. In this case the shaft requires sufficient hardness and surface finish. If the shaft cannot serve as the raceway, select a type with an inner ring and match the shaft diameter using the bore diameter d.

2. 2. Check housing dimensions by outside diameter and width

   The outside diameter D determines the housing bore diameter, and the width C determines the axial installation space. Shell types have thin walls and allow a smaller outside diameter, but they are retained by press fit, so the housing bore tolerance and rigidity must be verified.

3. 3. Verify life and static strength with rated loads

   The basic dynamic load rating Cr is used for calculating rolling fatigue life, and the basic static load rating C0r is used for examining permanent deformation under shock loads or stationary loads. The listed Cr values range widely from 1.23 to 13200 kN, and are larger for double-row types and larger diameters.

4. 4. Choose the type suited to the application

   Select shell types for space savings and solid types for high load and high rigidity. Select self-aligning types where shaft tilt is present, combined types with thrust bearings for fixed-side positions that also carry axial load, and cam followers for applications rolling along cams or rails.

5. 5. Match rotational speed with lubrication method

   The limiting speed varies with the lubrication method, and generally oil lubrication allows higher speeds than grease lubrication. Confirm that the operating speed is below the limiting speed for each lubrication condition.

6. 6. Consider sealing and operating environment

   In environments where foreign matter or moisture may enter, selecting contact-seal types such as RS or 2RS, or grease-packed types, helps retain lubricant and reduces relubrication effort. However, the seal increases rotational resistance and imposes limits on operating temperature, so these points should be considered.

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

About Needle roller bearings and all products

Description

Needle roller bearing sealed with grease that solidifies when heated. Oil is gradually supplied to the rolling surfaces by heat generated during use and centrifugal force, resulting in low leakage. As the grease is solid, it is less likely to flow out by emulsifying when moisture enters. Use within an outer ring temperature range of -20 to 80°C; for long-term use, 60°C or below is recommended. Cannot be used in environments exposed to organic solvents.

FAQ

Q. What is the operating temperature range of the Poly Lube Needle Bearing, and what temperature is recommended for long-term use?

A. It is used within an outer ring temperature range of -20 to 80°C. For long-term use, 60°C or below is recommended.

Q. Can the Poly Lube Needle Bearing be used in environments with organic solvents?

A. No, it cannot be used in environments exposed to organic solvents.

Q. To what extent does the Poly Lube Needle Bearing reduce grease leakage and relubrication effort?

A. It is sealed with grease that solidifies when heated. Oil is gradually supplied to the rolling surfaces by heat generated during use and centrifugal force, which results in low leakage. Grease-free operation also reduces relubrication maintenance.

Q. Does grease flow out easily if the Poly Lube Needle Bearing gets moisture inside?

A. Because the grease is solid, it emulsifies and is less likely to flow out when moisture enters.

Q. How do torque and temperature rise of the Poly Lube Needle Bearing compare with bearings using standard grease?

A. It has lower torque and temperature rise than bearings using standard grease.

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

Source documents

• Catalog ニードルローラベアリング ハンドブック 80 pages Open page 51
  Found on: https://www.ntn.co.jp/japan/products/catalog/ja/2203/index.html