As a design engineer at Bearing Manufacturing Company, you have been assigned to work on a conveyor system design for a leading manufacturer's shipping and receiving system. The specific component under consideration is a transmission shaft that will transfer 15 kW of power at a speed determined by the formula (450 plus the last 2 digits of your student ID) rpm. This power will be transmitted from a bevel gear G1 to a helical gear G2, with the shaft being supported by two taper roller bearings, B1 and B2. The gear tooth forces acting on the helical gear are concentrated at a pitch circle radius of 80 mm, while for the bevel gear, the forces can be assumed to act at the large end of the tooth with a radius of 75 mm. The journal diameter at bearings B1 and B2 is specified to be 40 mm. The design specifications require the bearings to have a design life of 8 years, operating for 40 hours a week, at the mentioned speed (450 plus the last 2 digits of your student ID). Additionally, an application load factor of 1.15 should be considered, and a target reliability of 97.5% is desired for the bearing set. It is worth noting that both bearings B1 and B2 are identical, with B2 specifically taking the thrust force due to the bevel and helical gears. Your task is to select suitable taper roller bearings for this application, taking into account the specified design life, operating conditions, load factor, and reliability requirements. Consider factors such as bearing size, load-carrying capacity, speed rating, and any other relevant considerations to ensure the chosen bearings can meet the demands of the conveyor system in a reliable and efficient manner.

NA Y 250 Rv2 B2 1265 3473 Vertical plane Gz 250 (a) 150 3820 B. 439 G T 1319 G2 RV 75 1439 3473 B G 250 150 K 250 RH2 Horizontal plane 1265 80 TRHI (b) 1475 3820