NSK Self-Aligning Ball Bearings, Cylindrical Bore Bearings 1301 ,D=12

NSK Self-Aligning Ball Bearings, Cylindrical Bore Bearings 1301 ,D=12    Bearing Numbers Boundary Dimensions (mm) Basic Load Ratings (kN) Limiting Speeds (min-1) Constant e Axial Load Factors Mass (kg) approx. d D B r min. Cr C0r Grease Oil Y2 Y3 Y0 1301 12 37 12 1 9.65 2.16 18000 22000 0.33 2.9 1.9 2 0.066     DESIGN, TYPES, AND FEATURESThe outer ring of a self-aligning ball bearing has a spherical raceway and its center of curvature coincides with that of the bearing; therefore, the axis of the inner ring, balls and cage can deflect to some extent around the bearing center. This type is recommended when the alignment of the shaft and housing is difficult and when the shaft may bend. Since the contact angle is small, axial load capacity is low. Pressed-steel cages are usually used.     PROTRUSION AMOUNT  Some self-aligning ball bearings have balls that protrude from the side face as shown below. This protrusion amount b1 is listed in the following table.         P