Because the balls are rolling they have a much lower coefficient of friction than if two flat surfaces were sliding against each other.īall bearings tend to have lower load capacity for their size than other kinds of rolling-element bearings due to the smaller contact area between the balls and races. As one of the bearing races rotates it causes the balls to rotate as well. In most applications, one race is stationary and the other is attached to the rotating assembly (e.g., a hub or shaft). It achieves this by using at least two races to contain the balls and transmit the loads through the balls. The purpose of a ball bearing is to reduce rotational friction and support radial and axial loads. A four-point angular-contact ball bearing A ball bearing for skateboard wheels with a plastic cage Wingqvist's self-aligning ball bearingĪ ball bearing is a type of rolling-element bearing that uses balls to maintain the separation between the bearing races. Working principle for a ball bearing red dots show direction of rotation. Please consider expanding the lead to provide an accessible overview of all important aspects of the article. Shared boundary dimensions (BL2/Series 62, B元/Series 63) allow for easy replacement.This article's lead section may be too short to adequately summarize the key points. However, they are not suitable for axial loads due to the ball filling slots. Maximum ball bearings can support large radial loads as they contain more balls than deep groove ball bearings. Maximum ball bearings feature pressed steel cages. When using these bearings, the filling slot in the outer ring should be positioned outside of the loaded zone as much as possible. ZZ-type shielded bearings are available in addition to open bearings. Industrial motors, servomotors, stepper motors, electric machinery, agricultural machinery (tractors, string trimmers), textile machines, carriers/conveyance, film rolling mills, powder/particle clutches, outboard boat motors, etc.įilling slots in the inner and outer rings allow maximum ball bearings to contain a larger number of balls than normal deep groove ball bearings however, the slots make them unsuitable for applications with high axial loads.īL2 and B元 types have boundary dimensions equal to those of Series 62 and 63 single-row deep groove ball bearings respectively.Single-row DGBBs sustain radial loads and axial loads in both directions.ĭGBBs are the most popular type of bearing and have been used in countless applications.ĭGBBs provide low frictional torque and high rotational speed ideal for applications requiring low noise/vibration. Snap rings are sometimes used on the outside diameter of the outer ring.Ĭages are generally made of pressed steel, though large bearings and bearings designed for high-speeds may use machined brass cages. In addition to open varieties, these bearings can have steel shields or come pre-lubricated with grease maintained by rubber seals installed on one or both sides. The raceway grooves in the inner and outer rings form a circular arc with a slightly larger radius than that of the rolling balls. Single-row deep groove ball bearings are the most common type of rolling bearing.
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