High-Speed Combined Angular Contact Ball Bearing ACT000DB/BDB Series

Specifications

How to choose Angular Contact Ball Bearings

Points to check when selecting, with the values for this product (High-Speed Combined Angular Contact Ball Bearing ACT000DB/BDB Series).

1. 1. Determine Axial Load Capacity by Contact Angle

   This product: Contact Angle α 30° (DB), 40° (BDB)

   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 30–170 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

   This product: Basic dynamic load rating Cr 18.9–191 kN

   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

   This product: Permissible speed (grease lubrication) 2,700–20,000 min-1

   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

Designed with a reduced contact angle for suitability in high-speed rotation. Negative tolerance is applied to the outer diameter dimensions so that only axial load is applied. Grades are equivalent to JIS Class 5 and Class 4, and the cage and grease types are selected by the model number code. Preload options are L (light preload) and M (medium preload), and the dimension table shows the standard preload force and axial stiffness.

FAQ

Q. What are the contact angles of the ACT000DB/BDB series?

A. The contact angles are 30° (DB) and 40° (BDB).

Q. What applications is the ACT000DB/BDB series suited for, and what dimension ranges are available?

A. It is suited for applications that support axial loads in machine tool spindles. Dimensions are listed for bore diameter d of 30 to 170 mm and outer diameter D of 55 to 260 mm.

Q. Does the ACT000DB/BDB series support high-speed rotation? What is the permissible rotational speed?

A. The design has a reduced contact angle for suitability in high-speed rotation. The permissible rotational speed (grease lubrication) is 2 700 to 20 000 min-1.

Q. What are the precision grade and preload types of the ACT000DB/BDB series?

A. Precision is equivalent to JIS Class 5 and Class 4. There are two preload options, L (light preload) and M (medium preload), and the dimension table shows the standard preload force and axial stiffness.

Q. Which bearings is the ACT000DB/BDB series used in combination with?

A. It is used in combination with NN3000 series cylindrical roller bearings.

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

Source documents

• Catalog 精密転がり軸受 Precision Ball & Roller Bearings (CAT.NO.BA005JA-5DS) Open page 121
  Found on: https://koyo.jtekt.co.jp/support/catalog-download/