The main role of automobile bearings is to load and provide accurate guidance for the rotation of the hub, it is subject to both axial load and radial load, is a very important parts. In the maintenance process, often found some cars have a greater driving noise, check the tire without abnormal wear and tear, in the lift on the wheels without obvious abnormal sound. This phenomenon is often caused by the wheel hub bearing abnormal damage, the so-called abnormal is caused by the installation of the bearing damage. Car front wheel bearings are generally double row ball bearings, the installation of the bearings when the use of hammer percussion installation, or when the bearing is installed into the bearing seat by pressing the bearing inner ring way to install, will cause the side of the bearing raceway damage. When the vehicle is running noise, and when the wheels off the ground because of the better side of the raceway, and therefore can not hear significant noise. The correct installation operation is the key to the long life of the bearing.