Deep groove ball bearing consists of four basic components, which are in raceway (inner), outer raceway (outer ring), ball and cage. Under normal operating conditions, inner raceway, outer raceway and the ball under load, and separation from the cage for the ball and keep stability. Single row deep groove ball bearings to the heart of simple structure, inner and outer rings are not isolated, easy to use, mainly used to bear radial load, it can withstand a certain amount of axial load. Increase the bearing radial clearance, the thrust bearing with the nature of the heart, can bear large axial load. Such bearings may limit the axial movement in both directions.