How to measure and install the size of angular contact bearings

Take a single set of angular contact ball bearings as an example;

The measuring method of outer diameter and inner diameter is the same as single row deep groove ball bearing, and the width of angular contact deep groove ball bearing is called assembly height;

AC contact type: based on the big end, the pre-tightening force acts on the big end surface of the outer ring, and the actual force is on the other side of the inner ring; otherwise, based on the big end, the pre-tightening force acts on the inner ring On the other end face, the actual stress is on the large end face of the outer ring.

BM contact type: similar to the above case.

Features and uses of angular contact ball bearings:

Angular contact ball bearings have a high limit speed, can bear radial load and axial load at the same time, and can also bear pure axial load. The axial load capacity is determined by the contact angle and increases with the increase of the contact angle.

Single row angular contact ball bearings can only bear axial load in one direction. When bearing radial load, it will cause additional axial force, and the corresponding reverse load must be applied. Therefore, this kind of bearings are generally used in pairs. Double-row angular contact ball bearings can withstand large radial and axial bidirectional combined loads and moment loads, which are mainly radial loads. It can limit the bidirectional axial displacement of the shaft or housing, and the contact angle is 30 degrees.

Angular contact ball bearings installed in pairs can bear radial and axial two-way combined loads dominated by radial loads, and can also bear pure radial loads. The tandem configuration can only accommodate axial loads in one direction, while the other two configurations can accommodate axial loads in either direction. This type of bearing is generally selected and combined by the manufacturer and submitted to the user. After installation, there is preload interference, and the ring and steel ball are in the state of axial preload, thus improving the stiffness and rotation of the entire set of bearings as a single support. precision.

Specific classification and model comparison:

1. Angular contact ball bearing with a=15o (type 70000 C)

2. Angular contact ball bearing with a=25o (70000 AC type)

3. Angular contact ball bearing with a=40o (type 70000 B)

4. High-speed sealed angular contact ball bearing with a=15o (B70000 C-2RZ type)

5. High-speed sealed angular contact ball bearing with a=25o (B70000 AC-2RZ type)

6. High-speed sealed angular contact ceramic ball bearing with a=15o (B70000 C-2RZ/HQ1 type)

7. High-speed sealed angular contact ceramic ball bearing with a=25o (B70000 AC-2RZ/HQ1 type)

8. Back-to-back pairs of double angular contact ball bearings [70000 C (AC, B)/DB type]

9. Face-to-face paired double angular contact ball bearings [70000 C (AC, B)/DF type]

10. Double-connected angular contact ball bearings in series [70000 C (AC, B)/DT type]

11. Double row angular contact ball bearings with ball filling gaps (type 0000 a=30o)

12. Double row angular contact ball bearings without filling gaps (0000 A type a=30o)

13. Double row angular contact ball bearing with dust cover on one side (0000 A-Z type a=30o)

14. Double row angular contact ball bearing with dust cover on both sides (0000 A-2Z type a=30o)

15. Double row angular contact ball bearing with sealing ring on one side (0000 A-RZ type a=30o)

16. Double-row angular contact ball bearings with sealing rings on both sides (0000 A-2RZ type a=30o)

17. Four-point contact ball bearing (QJ type a=35o)

Use in pairs to increase or balance the bearing force. According to the direction of the axial force, you can choose DB back-to-back installation, DF face-to-face installation, DT series installation. For machine tool spindles, triple installation, quadruple installation, or even There are five joint installations. Usually, the axial load is bidirectional, and there are few pure unidirectional axial loads, so angular contact ball bearings are installed in pairs. On the one hand, the paired installation can increase the radial load capacity, on the other hand, it can also provide more targeted bearing load capacity and increase the toughness of the spindle.