Before working these problems download and use the latest versions of both parts of the rolling element bearing lecture notes. Use the full version of the Timken catalog. 20 mm 16 mm FB = 5.2 KN -200 mm 150 mm B 1. A 20 mm diameter (basic size) shaft carries a 5.2 kN transverse load with "moderate impact" (use the middle of the recommended range when determining the load application factor). It is supported by two identical Torrington drawn cup, caged needle bearings with open ends. The bearings have a length of 16 mm. The shaft is made of carbon steel heat-treated to a surface hardness of 57 HRC. Clean, well-filtered oil is used for lubrication. The shaft rotates at 650 rpm. A life of 800 hours is required for the application. 20 points (a) What is the part number ("bearing designation") of these bearings? (b) What is the static factor of safety for the most severely loaded bearing? (c) What reliability is expected for the most severely loaded bearing? Answers (a) Bearing designation (b) no (c) R (%)