The choose and buy the basic elements of rolling bearings

When making new spindle design, the choice before rolling bearing, consider performance parameters of the spindle, roughly determine the performance of the key, then enter the further exploration. （ Including: the spindle speed, the accuracy of spindle, the spindle rigidity, life of the spindle, spindle's fever, reliability) Determines the main parameters, the agent of spindle (actual size Trunnion, length, bearing span) 。 According to the form of rolling bearings bearing ( Ball or roller bearing) With column ( With the number of columns) Drive mode (, With within, gears, motors, motor) , lubrication ( Grease, oil and gas, oil mist, spray) Set to determine the structure parameters such as spindle. 1, mainly bear radial load bearing radial load of rolling bearings for radial bearings. This type of bearing the nominal contact Angle of a0 & lt; = 450. Size of the same roller bearing is larger than the ball bearing can bear radial load. N and NU type cylindrical roller bearing can bear radial load, other types of centripetal bearing can bear radial load, can also carry axial load. 2, mainly bear axial load bearing axial load of bearing, generally for the thrust bearing, its nominal contact corner a0 & gt; 450. Thrust bearing and thrust angular contact ball bearing according to the different structures can take one or two directions at the same time of axial force. When bear particularly high force optimization with thrust cylindrical roller bearings, thrust spherical roller bearings. Thrust spherical roller bearings and one-way thrust angular contact ball bearings can carry axial load and radial load at the same time, other thrust bearing can only carry axial load. 3 a shaft bearing, bearing its own length compensation and bearing usually adopt fixed bearing and floating bearing structure. The length of the winding roll shaft bearing compensation error and thermal expansion. NU type and swimming N type cylindrical roller bearings are the ideal bearing, the bearing itself can compensate for length. Bearing inner and outer circle can use a tight fit. 4, the length of the sliding fit swim integral bearing can also compensate for bearings. This kind of bearing with a use of the two ring, no axial fixed surface. Therefore, bearing a ring can be the supporting surface activity. After determination precision bearing size, type, consider the specific design bearing. Fully considering the bearing fatigue life, rigid, fever and other factors, select the most appropriate bearing clearance ( Preload) 。 Due to rolling bearing clearance and preload, the key performance of INA bearings, the high-speed operation, the more the key, so must be considered. Choose not to at that time, will produce the problem such as early damage or sintering. Necessary from step to step 3, 4 or from step 4 to step 2, consider again and again. Determine the spindle structure design, want to consider the need of actual installation conditions. High precision bearing installation of shaft and bearing accuracy, tolerance matching and installation of fixed set nut tightening force, after the actual installation of rolling bearing preload and confirmation of the internal clearance.