Angular contact ball bearing is consist of outer ring, inner ring, steel balls, seals and grease, with features that the contact angle between the line connecting the ball and the raceway contact point and the radial plane vertical to the bearing axis line is generally between 0° and 45°. Common angle is 15°, 25°, 40°. According to the number of rows of the steel balls, bearings are divided into single row angular contact ball bearing, double row angular contact bearing etc.

Bearing cage

The high-quality cage used by QIBR bearings ensure that the balls are evenly distributed in the bearing rings and can be rotated properly.

The cage has stamped steel wave type, stamped steel rivet type, nylon or phenolic plastic.

QIBR offers a wide range of advice and options depending on the operating conditions.

Type of lubrication

Lubricating oil is the basic lubricant for ball bearings. Previously most of the lubricating oil was extracted from petroleum. Synthetic oils are now acceptable due to improved performance, such as two lipid synthetic oils, silicones and fluorocarbon synthetic oils. In general, lipid synthetic oils have better low temperature properties, lower volatility, and better temperature characteristics and viscosity compared than petroleum refined oils. Essentially all lubricants contain additives to inhibit chemical changes, prevent metal corrosion, and improve physical properties (antifoam, etc.).

The silicone and fluorocarbon synthetic oils that adopted by QIBR have lower volatility and wider temperature/viscosity characteristics.

Service life and the rated load

The bearing life is the number of bearing rotations before the fatigue occurs on the ring or any rolling element (or the rotation time at a constant speed). However, the same set of bearings will not necessarily have the same life under the same conditions. In this case, the rated life is the number of rotations that 90% of the bearings in this group can reach or exceed before bearing weariness (or the rotation time at a constant speed). The service life of QIBR series bearings are 10%-20% longer than other bearings of the same model, through strict production process, high standard material selection, precision control.

Single row angular contact ball bearing

Double row angular contact ball bearing

Paired mounting angular contact ball bearings

Because single-row angular contact ball bearings can only withstand axial loads in one direction, more occasions in life are used in pairs with single row angular contact ball bearings, or triple, quadruple or even multiple combinations. There are three types of commonly used QIBR angle ball bearings, back-to-back, face-to-face, and tandem arrangement. As shown below

Tandem arrangement angular contact ball bearing

Back-to-back combination angular contact ball bearing

Face-to-face combination angular contact ball bearing

Tandem arrangement: The radial and axial loads are equally shared by the two bearings, and the bearing can only withstand the axial load from one direction, just have stronger axial load capacity compared with a single bearing.

Back-to-back combination: The intersection point of the pressure lines of two single row bearings with axis line is on the outer side of bearing, the distance between the pressure points is increased, with strong rigidity, and are able to withstand the overturning moment and axial force from two directions, the effect is similar to one double row angular contact ball bearing.

Face-to-face combination: The intersection point of the pressure lines of two single row bearings with axis line is on the inner side of bearing, the rigidity is low. It is not suitable to withstanding the overturning moment, but can withstand the axial force in two directions. This form is generally recommended.

Bearings that can be mounted in a matched combination require high precision manufacturing of the bearings, paired bearings and double row angular contact ball bearing code 0.

Single row angular contact ball bearings code 7