Exercise 2 A pair of helical gears has 23° helix angle is to transmit 2.5 kW at 10000 rev/min of the pinion. The velocity ratio is 4/1. Both gears are made of hardened steel with an allowable strength of 60-100 MPa for each gear. The gears are 20° stub and the pinion has 24 teeth. Determine the minimum diameter gears that may be used and the required BHN 20° The