In many machines, there is a constant rotation or rotation of the shaft. The components carrying the weight of the shaft are called bearings. Bearings are an important part of contemporary machinery and equipment. Its main function is to support the mechanical rotating body, reduce the friction coefficient during its movement, and to ensure its rotation accuracy. The purpose of the bearing is to carry the weight of the shaft without causing unnecessary deceleration. As if you put a book on the tablecloth, and push the book, it would not fall. Remove the wallpaper, the book will slide, because the table of wood is smooth.
Journal bearings are mainly bearing radial forces. The journal bearing is the hole of the mounting shaft. The axial dimension of the bearing is called the bearing width. This hole is usually lined with metallic bronze, or special metal called Babbitt, very smooth. In a roller bearing, the metal rod is mounted in the hole; in the ball bearing, the use of metal balls; these further reduce the friction, just like the pencil and marbles on the table. Roller bearings are used for railway vehicles and wheels for cars, ball bearings for skates and bicycles. In the watch, jewelry is used as a bearing.
Journal bearings provide radial support, radial load, rotor weight support and centrifugal force due to rotor mass imbalance, and to determine the radial position of the rotor. Radial bearings are split type, integral type, flange type and self-position type and so on several types. Split bearing cover can be opened, easy to load the journal, bearing wear easily adjust the bearing clearance. The integral bearing construction is simple, but the journal must be loaded from one end, can not adjust the gap after wear. The mounting surface of the flange bearing is perpendicular to the bearing centerline. Self-aligning bearings can automatically adjust the axis to accommodate the shaft's flexural deformation.