Angular Contact Ball Bearing

Specifications

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How to choose Angular Contact Ball Bearings

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

1. 1. Determine Axial Load Capacity by Contact Angle

   This product: Contact Angle α 15・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 100～300 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

Contact angles can be selected from 15, 30, or 40 degrees. A larger contact angle provides higher axial load capacity, while a smaller contact angle is suited to high-speed rotation. Single row bearings have a small permissible misalignment angle, and combined and multi-row bearings do not permit misalignment. Internal clearance and cage types are also listed.

FAQ

Q. From which contact angles can angular contact ball bearings be selected?

A. Contact angles can be selected from 15, 30, or 40 degrees. A larger contact angle provides higher axial load capacity, while a smaller contact angle is suited to high-speed rotation.

Q. In which directions can single row and combined or multi-row angular contact ball bearings accept axial load?

A. Single row bearings accept axial load in one direction. Combined (DB, DF) and multi-row bearings accept axial load in both directions.

Q. How does the permissible misalignment differ between single row and combined angular contact ball bearings?

A. Single row bearings have a small permissible misalignment angle, and combined and multi-row bearings do not permit misalignment. The permissible misalignment angle of single row bearings is 0.0006 rad.

Q. What are the target bore dimensions and main applications of angular contact ball bearings?

A. Bore diameter d is listed in the range of approximately 100 to 300 mm. Applications include machine tool spindles, pumps and compressors, and general industrial machinery.

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/