Problem 3: (40 pts) The shaft shown in figure below is loaded by a 2500 N lateral force and a 540 N axial force. It is desired to mount the shaft using a straight cylindrical roller bearing at location A and an angular-contact ball bearing at location B. The bearings desired life is 30 khrs life at 300 rpm with a single bearing reliability of 0.96 and a load factor of 1.2. a) Taking into account the bearing type, calculate the radial and axial (thrust) forces on the bearings, Far, FAa, FBr, and FBa. b) Select the most economical 03-series straight cylindrical roller bearing ID size at A. c) Select the most economical single-row angular contact bearing ID size at B. Hint: Use data from Tables (11-2 and 11-3) for the selection. ME 308- Homework # 4 Bearing B Angular contact bearing 260 mm 2500 N 2500 N Shaft 740 mm Thrust =540 N Bearing A Straight cylindrical roller bearing 2

Fig: 1