II.
a. The following are the details of the pair of spur gears :
(10)
Details
Pinion
Gear
Speed, rpm
1440
720
Allowable bending stress, MPa
200
180
Surface hardness, BHN
250
200
Modulus of elasticity, GPa
200
200
Tooth profile
20° full depth involute
Face width
32mm
The centre distance is 132mm. The pinion has 22 teeth. Determine the power
that can be transmitted based on (a) bending strength b) surface endurance
strength.