RCC Bearing (Sealed Cylindrical Roller Bearing for Railway Vehicle Axle Boxes)

Specifications

How to choose Cylindrical Roller Bearings

Points to check when selecting, with the values for this product (RCC Bearing (Sealed Cylindrical Roller Bearing for Railway Vehicle Axle Boxes)).

1. 1. Boundary dimensions that fit the shaft and housing

   Select the bore diameter d to match the shaft diameter and the outside diameter D to match the housing bore, and determine the width B from the available installation space. Even with the same bore, there are dimension series with different outside diameters and widths, and wide-section types and types with thicker outer ring walls also exist. Confirm the boundary dimensions d×D×B combination against the bearing number.

2. 2. Select a rated load that suits the load conditions

   This product: Basic dynamic load rating Cr 825000 N

   The basic dynamic load rating Cr is the basis for life calculation; calculate whether the required life is met from the actual load and rotational speed. For large loads at standstill or low speed, or for shock loads, also check the basic static load rating C0r. Wide-section, double-row and full-complement types are options when greater load capacity is needed.

3. 3. Determine the type for fixed and free positions

   NU and N types allow relative axial movement between the inner and outer rings, making them suitable for the free side that absorbs thermal expansion of the shaft. If axial load is applied, choose NJ or NF types for one direction, or NUP types for both directions. First determine which bearing in the overall bearing arrangement locates the shaft axially.

4. 4. Select a clearance that suits fit and temperature

   Internal clearance is available in classes such as C2, CN and C3. Consider a larger clearance class where an interference fit or a temperature difference between inner and outer rings reduces the clearance during operation. Tapered bore double-row types allow clearance adjustment by the amount of push-in and are used in applications with strict clearance control, such as machine tool spindles.

5. 5. Match rotational speed with cage and accuracy grade

   For high-speed rotation, check the permissible rotational speed as well as the cage material (brass, steel sheet or resin) and the accuracy class. Full-complement types without cage have high load capacity but are unsuitable for high speed. Hybrid types with silicon nitride rollers offer low friction and support high-speed rotation.

6. 6. Check electrical erosion countermeasures and maintainability

   In inverter-driven motors and generators, current can flow through the bearing causing electrical erosion, so consider insulated-coated or ceramic-roller types. For outdoor use or locations that are difficult to lubricate, also check for sealed, grease-packed designs, rust-preventive treatment, and ease of disassembly and inspection.

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

About Cylindrical Roller Bearings and all products

Description

A unit-type bearing in which dedicated oil seals are fitted directly to both ends of a double-row cylindrical roller bearing, and long-life grease is packed inside. The shaft end can be exposed simply by removing the end cap, which makes flaw detection and grinding easy. The roller and cage subunit can be removed from the inner and outer rings, making cleaning and inspection straightforward. The outer ring exterior is treated with anti-rust coating. Because only an adapter needs to be placed on the axle box side, the structure is simple and weight can be reduced.

FAQ

Q. What are the applications of the RCC Bearing (Sealed Cylindrical Roller Bearing for Railway Vehicle Axle Boxes), and what types of vehicles can it be used on?

A. It is used in axle boxes of railway vehicles (electric multiple units and passenger coaches).

Q. What are the boundary dimensions and basic dynamic load rating Cr of the RCC Bearing?

A. The boundary dimensions d×D×B are 130×240×160 mm, and the basic dynamic load rating Cr is 825000 N.

Q. What is the structure of the RCC Bearing, and how can the shaft end be inspected by flaw detection and ground?

A. It is a unit-type bearing in which dedicated oil seals are fitted directly to both ends of a double-row cylindrical roller bearing, and long-life grease is packed inside. The shaft end can be exposed simply by removing the end cap, which makes flaw detection and grinding easy.

Q. How can the RCC Bearing be cleaned and inspected?

A. The roller and cage subunit can be removed from the inner and outer rings, making the structure easy to clean and inspect.

Q. What are the anti-rust measures and axle box side structural features of the RCC Bearing?

A. The outer ring exterior is treated with anti-rust coating. Because only an adapter needs to be placed on the axle box side, the structure is simple and weight can be reduced.

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

Source documents

• Document Technical Report CAT. No. E728h (ローリング ベアリングの技術資料) 154 pages
  Found on: https://www.nsk.com/tools-resources/technical-report/