Double-Row Angular Contact Ball Bearing

Specifications

How to choose Angular Contact Ball Bearings

Points to check when selecting, with the values for this product (Double-Row Angular Contact Ball Bearing).

1. 1. Determine Axial Load Capacity by Contact Angle

   This product: Contact Angle α 30～40 °

   A larger contact angle increases axial load capacity and axial rigidity, while a smaller contact angle is better suited to high-speed rotation. Listed products have contact angles of 15° to 60°, with 15°, 30°, and 40° being common. Large contact angles are used for ball screw support applications. Select based on the load ratio and rotational speed.

2. 2. Select a Combination Configuration Suited to the Load Direction

   DB arrangements withstand moment loads well and easily increase shaft rigidity, while DF arrangements readily tolerate tilt caused by mounting errors. DT arrangements share large one-directional axial loads across multiple rows. If axial loads act in both directions, DB or DF arrangements or double-row types are required.

3. 3. Check Main Dimensions Matching the Shaft and Housing

   This product: Inner diameter d 120～280 mm

   Match the bore to the shaft diameter and the outside diameter to the housing bore diameter. Listed products have bore diameters of 30 to 670 mm and outside diameters of 55 to 900 mm. Confirm that the width, including the total width of combined units, fits the available axial space.

4. 4. Verify Life Using Basic Dynamic Load Rating

   The basic dynamic load rating Cr is the reference value for rated life calculations, and listed products range from 18.9 to 191 kN. Calculate the dynamic equivalent load from radial and axial loads and confirm that the required life is met. If impact or large loads during stops are present, also check the basic static load rating.

5. 5. Permissible Rotational Speed by Lubrication Method

   The permissible rotational speed differs between grease lubrication and oil lubrication, with oil lubrication set higher. Larger combinations or preloads increase heat generation and reduce practical speed, so confirm that there is sufficient margin in the operating speed together with the lubrication method.

6. 6. Precision Class and Cage Selection by Application

   General industrial machinery uses JIS Class 0, while locations requiring rotational accuracy, such as machine tool spindles, use high-precision grades such as Class 5 or Class 4. Cages are available in steel plate, resin, and machined brass types; confirm the material against the required high-speed capability, heat resistance, and lubrication conditions.

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

About Angular Contact Ball Bearings and all products

Description

Double-row angular contact ball bearing with a bore diameter of 120 to 280 mm. Contact angle is 30°, 32° or 40° depending on the bearing number. Outer ring may be fitted with oil grooves and oil holes.

FAQ

Q. What are the bore diameter, outer diameter and width ranges for double-row angular contact ball bearings?

A. Bore diameter d: 120 to 280 mm, outer diameter D: 190 to 389.5 mm, width B: 66 to 92 mm.

Q. In which directions can double-row angular contact ball bearings accept loads?

A. They accept radial and axial loads in both directions. They accept axial loads in both directions.

Q. What is the contact angle of double-row angular contact ball bearings?

A. Contact angle α is 30 to 40°. Contact angle is 30°, 32° or 40° depending on the bearing number.

Q. Do the outer rings of double-row angular contact ball bearings have oil grooves or oil holes?

A. Outer rings may be fitted with oil grooves and oil holes.

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

Source documents

• Catalog JTEKT 大形転がり軸受カタログ（技術解説・軸受寸法表） Open page 62
  Found on: https://koyo.jtekt.co.jp/support/catalog-download/