A simple gear train of 30 and 50 teeth for pinion and gear wheel respectively, is used to drive an electric wheelchair at a velocity that is double the maximum velocity of slip. The pinion has an equal addendum as the gear wheel, a module of 3 mm, and a pressure angle of 14.5º. The wheelchair has a maximum velocity of 5 m/s when its pinion rotates at 800 r.p.m. Calculate: 1.5. The addendum of the gears in mm. 1.6. The contact ratio.

A gear box has an input speed of 1800 rev/min clockwise and an output speed of 400 rev/min The input power is 25kW and the efficiency is 90%. Compute the input torque                                                                                                                                                  the output power                                                                                                                                                       3. the output torque

6. 5 3 Arm 6. 2 Arm Arm 2 3 1 Bearing Given N2 = 30, N3 = 25, N4 =45, N5 = 40, N6 = 200 W2 = 240 rpm ccw, warm = 120 rpm cw, T2 = 12 ft-lb Show your work. Answers without work will not be accepted a. Identify the gear sets. b. Determine the velocity gear train ratio and the angular velocity of gear 6. c. Determine the torque gear train ratio and output torque of gear 6.

The maximum sliding velocity of the teeth of two gear wheels in mesh is 0.32 m/s. The wheels are of module 5 mm and have 32 and 44 teeth respectively. The addendum for each wheel is 1.2 times the module and the pressure angle is 20°. Calculate: 2.1. The number of teeth in contact. 2.2. The angular speed of each wheel.