Bearee™ Sliding Materials for Underwater (Chemical Solution) Use

Specifications

How to choose Plain Bearings

Points to check when selecting, with the values for this product (Bearee™ Sliding Materials for Underwater (Chemical Solution) Use).

1. 1. Select dimensions that fit the shaft diameter and housing bore

   Match the inside diameter d to the shaft diameter and the outside diameter D to the housing bore diameter. Listed products have inside diameters of 3 to 70 mm and outside diameters of 5 to 80 mm. When press-fitting, allow for the bearing shrinking during installation, which reduces the inside diameter. Also check the shaft and housing tolerances recommended by the manufacturer.

2. 2. Verify bearing pressure and speed using the PV value

   This product: Limit PV value 400 MPa・m/min

   Confirm that the PV value, which is the product of bearing pressure (load divided by projected area) and sliding speed, does not exceed the limiting PV value. The limiting PV value of listed products is 400 MPa·m/min. The individual limits for bearing pressure alone (3 to 10 MPa) and for sliding speed alone (150 m/min) must also be satisfied.

3. 3. Determine the length according to the load

   Increasing the length L increases the projected area and lowers the bearing pressure. However, if the length is too great, shaft deflection tends to concentrate the load at the ends, causing edge loading. Listed products have lengths of 3 to 60 mm, so select a length that keeps the bearing pressure within the limit.

4. 4. Select a material suited to the operating environment

   For underwater or chemical-liquid use, choose a material with chemical resistance and wear resistance in liquid. Where static electricity is a concern, choose a conductive material. Wear of the mating material also varies with the material and hardness of the mating shaft. If antistatic performance is required, also check the volume resistivity.

5. 5. Check temperature and operating clearance

   Resin bearings expand as temperature rises, which reduces clearance. In addition to the maximum operating temperature (300 to 350 °C) and continuous operating temperature (260 °C), maintain the recommended minimum operating clearance (0.095 to 0.195 mm).

6. 6. Match the lubrication method to the maintenance conditions

   Whether a bearing can run without lubrication, or requires oil-impregnated or external lubrication, affects maintenance effort and the risk of contamination in the surroundings. Greaseless types are suitable for food machinery and clean environments. For use in vacuum, also check the usable vacuum level and low outgassing performance.

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

About Plain Bearings and all products

Description

Available in FL3700, AS5704, AS5965 and others, selectable according to application. Compared with carbon bearings, it is less prone to chipping and cracking; compared with metal static eliminator components, it causes less wear on the mating material.

FAQ

Q. In what applications can Bearee™ Sliding Materials for Underwater (Chemical Solution) Use be used for rotating parts in water or chemical solutions?

A. It has a track record of use in automotive electric water pumps and other applications. It can also be used for rotating parts operating underwater.

Q. What are the limiting PV value and continuous operating temperature of Bearee™ Sliding Materials for Underwater (Chemical Solution) Use?

A. The limiting PV value is 400 MPa·m/min, and the continuous operating temperature is 260 ℃.

Q. How does Bearee™ Sliding Materials for Underwater (Chemical Solution) Use compare with carbon bearings and metal static eliminator components?

A. It is less prone to chipping and cracking than carbon bearings. It causes less wear on the mating material than metal static eliminator components.

Q. What types of Bearee™ Sliding Materials for Underwater (Chemical Solution) Use are available?

A. Available in FL3700, AS5704, AS5965 and others, selectable according to application.

Q. What are the main features of Bearee™ Sliding Materials for Underwater (Chemical Solution) Use?

A. Key features are excellent wear resistance in liquids, excellent chemical resistance, and low wear on the mating material.

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

Source documents

• Catalog エンジニアリング・プラスチック製しゅう動部品 ベアリー™ 26 pages Open page 23
  Found on: https://www.ntn.co.jp/japan/products/catalog/ja/2203/index.html