2. The spur gear train drive shown in question 1 (as bearing D and E) fitted with full journal bearings. The shaft has a shaft journal diameter of 25 mm at bearing D with a unilateral tolerance of -0.01 mm. The bushing bore has a diameter of 25.04 mm with a unilateral tolerance of 0.03 mm. The 1/d ratio is unity. Using the results obtained "d" of question 1, find the followings. a) If the average viscosity is 150 mPa-s, analyze the minimum clearance assembly for bearing "D" and find the minimum oil film thickness and the power loss due to friction. b) Make comments about the suitability of the Journal bearing according to the results found at (a)

1. The figure below is a spur gear train drive and gear 2 is the inlet of the gear train. It transfers 12 kw of power at 1200 rpm. Gear 3 and 4 have 60 and 20 teeth respectively and are made with 20° pressure and full-depth teeth. The desired speed for the output shaft is 32 rpm. a. Find the minimum number tooth on gear 2 to obtain 32 rpm at the output and confirm its validation for interference-free power transfer. b. Find the speed ratio at each gear set using the results obtained at "a"(above). c. Determine the rotational speed of each gear (n2, n3, n4, and n5) using the results obtained at "a"(above). d. Find the torque of each shaft (Tin, Te, Tout) assuming that there is no frictional loss during the power transfer. e. Determine the radial, tangential and total forces transmitted at the last gear set assuming a module as m=4 mm, and draw the free body diagram of gear 4 showing the forces and torques. 75, 100 2007 In Out 4

Find the diameter of each gear using one simple gear train with 4 gears that work as a speed reducer with a ratio of 5:1 Input of 100 rpm, Output of 20 rpm. Consider number of teeth as: N1=20 N2=40 N3=80 N4=100   Use module of 2

all parts please