A frictionless gear train is shown in the figure. The leftmost 12-teeth gear is given a torque of 100N-m. The output torque from the 60-teeth gear on the right in N-m is 48 Teeth 12 Teeth T=100 N – m 60 Teeth 12 Teeth (A) 5 (B) 20 (C) 500 (D) 2000

In a gear set, a 36-tooth spur pinion drives a 60-tooth spur gear. The teeth of these gear are cast iron profile. The diametral pitch is 6-teeth/in, the face width si 0.5 inches, and the pressure angle is 20 degrees. Assume that the pinion transmits 10 hp at a speed of 2000 rpm. Find the pitch diameters of the gears. Find the pitch line velocity in ft/min Find the velocity factor Ky Find the tangential load in lbf Find the contact stress in kpsi, assuming CP=1960 psi.

Problem : A train of spur gears with 20°full-depth involute teeth is shown in the Figure below. Gear 1 is the driving gear and transmits 50 kW power at 300 rpm to the gear train. The number of teeth on gears 1, 2, 3 and 4 are 30, 60, 25 and 50 respectively, while the module for all gears is 8 mm. Gears 2 and 3 are mounted on the same shaft. Gear 1 is rotating in the clockwise direction when seen from the left side of the page. The shaft is made of plain carbon steel 40C8 (Syt = 380 N/mm2) and the factor of safety is 2. Using maximum shear stress theory, estimate suitable diameter of shaft. 150 500 125 3 B1 B2

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