Differences between face-to-face and back-to-back angular contact bearing bearings

Differences between face-to-face and back-to-back angular contact bearing bearings

High-speed precision angular contact ball bearings are mainly used in high-speed rotating occasions with lighter loads, requiring high precision, high speed, low temperature vibration and a certain service life of bearings. It is often used as supporting parts of high-speed motorized spindle in pairs. It is the key supporting parts of high-speed motorized spindle of internal surface grinder.

Angular contact ball bearings are installed in three ways: back to back, face to face and in series. When the back-to-back (wide end faces of two bearings are opposite) installation, the contact angle line of the bearing diffuses along the axis of rotation, which can increase the rigidity of its radial and axial supporting angles and maximize the anti-deformation ability. When the face-to-face (narrow end faces of two bearings are opposite), the contact angle line of the bearing converges towards the axis of rotation and its supporting angle. Degree rigidity is small. Because the inner ring of the bearing extends out of the outer ring, when the outer ring of the two bearings is pressed together, the original clearance of the outer ring is eliminated, and the preload load of the bearing can be increased. When the two bearings are installed in series arrangement (the wide end faces of the two bearings are in one direction), the contact angle lines of the bearings are in the same direction and parallel, so that the two bearings can share the working load in the same direction. 。 However, in order to ensure the axial stability of the installation, two pairs of bearings arranged in series must be installed opposite to each other at both ends of the shaft when using this installation form.

The difference between face-to-face and back-to-back angular contact bearing bearings lies in the different installation methods. The difference of installation method lies in the difference of stress point. The stress point is the intersection of two straight lines as shown in the figure.

1. In back-to-back installation, the load action center is outside the central line of the bearing; in face-to-face installation, the load action center is within the central line of the bearing;

2. When the back-to-back is installed, the force action point spans are larger, so the rigidity of the cantilever end is larger. When the shaft is heated and elongated, the clearance of the bearing increases and the bearing will not be jammed and damaged; when the shaft is heated and elongated, the structure is simple and the disassembly is convenient. When the shaft is heated and elongated, the clearance of the bearing decreases and the bearing will be jammed easily. Adjustment of bearing clearance;

3. The load of the back-to-back bearing is separated from the bearing shaft. Axial loads acting in both directions can be sustained, but the loads in each direction can only be borne by one bearing. Back-to-back mounted bearings provide relatively rigid bearing configurations and can withstand overturning moments.

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