Analysis and calculation A closed standard cylindrical gear drive, the modulus m=5 mm, number of pinion teeth Z =25, transmission ratio i=2.4, check the tooth shape coefficient of big and small gear YFa2 2.32,YFal-2.72, stress correction coefficients of large and small gears Ysa2 1.76, Ysal 1.58, the allowable bending stress of large and small gears is: [GF] 2=300MPa, [F] 1=320MPa, and the root bending stress of large gear is calculated OF2 280MPa. Ask: Is the bending fatigue strength of the two gears sufficient?