02 A 20 pressure angle spur pinion rotates at 600 rev/min and transmits 10 kW to a gear (See the figure below). The gear ratio is 2.3 ± 2%. The pinion modules available are 2,3, 4 and 5 mm. The pear is steel, through hardened for non and gear. The loannel hardness of 200, tooth surface pinion is a grade 1 steel with a hardness of 240 Brinell tooth surface and through-hardened core. The and core. Poisson's ratio is 0.30 for pinion and gear. The loading has moderate shock with a service factor of 1.2. Assume a pinion life of 10 cycles and a reliability of 0.90. The tooth profile is owned. This is a commercially enclosed gear unit. The gears are manufactured to a No. 6 quality standard and you can make any number of reasonable assumptions. a) Give two possible sets of gear teeth for this design. b) If the pinion allowable bending stress in 140 MPa, estimate a suitable face width for the pinion given that the applied bending stress on the pinion is: 2.4 Wt 1 c) State if the design is good or not, given that for a good design the module and face width are related by 10m Sbs 15m. (You do not have to repeat the design if this relation is not satisfied) d) Give three reasons why the gears should be lubricated. mb Yj output input