Overview of Angular Contact Ball Bearings
Writer： admin Time：2022-08-29 17:14 Browse：℃
Angular contact ball bearings have a high limit speed, and 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: 718, 719, 70, 72 series bearings
Single row angular contact ball bearings can bear radial load and axial load in one direction at the same time, and can also bear pure axial load in one direction. When bearing radial load, axial component force will be caused. Therefore, single row angular contact ball bearings often need to be matched with other bearings bearing axial loads in the opposite direction. That is to say, angular contact ball bearings are usually used in duplex, triple, quadruple or even quintuple. Angular contact ball bearings have a higher limit speed.
The precision angular contact ball bearings for the spindle are listed in four sizes: 718, 719, 70 and 72. For bearings with the same inner diameter, the outer diameter and width increase in turn.
The contact angle of precision angular contact ball bearings is divided into 15° (code C) and 25° (code AC). For angular contact ball bearings, the larger the contact angle, the greater the axial load capacity, but the limit speed of the bearing. lower. Therefore, a bearing with a contact angle of 15° should be used for the spindle support with high rotational speed and small axial load, otherwise, an angular contact ball bearing with a contact angle of 25° should be used.
Double row angular contact ball bearings: 2344, 2347 series bearings
The contact ball bearing for bidirectional thrust is composed of two shaft washers, one seat washer, one spacer sleeve and two rows of rolling elements and cage assemblies. The clearance and preload of the bearing can be adjusted by grinding the thickness of the spacer. The contact angle of the bearing is 60°. The nominal outer diameter of the bearing is the same as the outer diameter of the matching double row cylindrical roller bearing, but there is a gap between the outer ring and the box hole. Therefore, the two-way thrust angular ball bearing does not bear radial load, which is different from that of the double row cylindrical roller bearing. Cylindrical roller bearings are used together to withstand bidirectional axial loads.
Two-way thrust angular contact ball bearings are divided into two size series, 2344 and 2347. The 2344 series bearings are used to match the small end of the double row cylindrical roller bearing with the tapered hole, and the 2347 series are used for the big end.
There is an annular oil groove and three symmetrically distributed lubricating oil holes in the middle of the outer ring of the two-way thrust angular contact ball bearing. The lubricant is introduced between the two rows of rolling elements and the cage assembly, and the purpose of lubrication is achieved by the rotation of the bearing.
Two-way thrust angular contact ball bearings have the advantages of high precision, good rigidity, low temperature rise, high rotation speed, and convenient loading and unloading.