To prevent the inner race of a bearing from creeping or spinning, what method is used?

To prevent the inner race of a bearing from creeping or spinning, an interference fit is utilized. This method involves a slight size difference between the inner race and the shaft it is mounted on. Specifically, the inner race has a slightly smaller diameter than the shaft, resulting in a tight fit when the bearing is installed.

The interference fit ensures that the inner race is held securely in place, creating a strong bond that reduces the possibility of movement. This is crucial because any creeping or spinning of the inner race can lead to premature wear, misalignment, and potential bearing failure, negatively impacting the overall performance of the machinery.

Other fitting methods such as press fit, tapered fit, and clearance fit have different characteristics and applications. A press fit typically refers to a fit that is pressed together but may not necessarily provide the same level of lock against movement as an interference fit. A clearance fit allows for movement between the inner race and the shaft, which would not be suitable for preventing creeping. Meanwhile, a tapered fit is used for specific applications, particularly where adjustments can be made or where easy disassembly is required, but it may not provide the same security as an interference fit in terms of preventing rotation or movement.