Question

Question 2 16 Marks The double reduction helical gear reducer shown in Figure 2 transmits 40000+4Y W (Y is the last 4 digits of your student identification number). Shaft I is the input, rotating at 200+q rad's and receiving power directly from the electric motor through a flexible coupling. Shaft 2 rotates at 90 +q rad/s. shaft 3 is the output, rotating at 27+Q rad's. (where Q are the last two , digits of your student identification number). A chain sprocket is mounted on the output shaft as shown and delivers power upward. The data for the gears are given in Table 1 Each gear has a 25-degree pressure angle and a 45-degree helix angle. The combinations of the left- and right- hand helixes are arranged so that the axial forces oppose each other's on shaft 2 as shown. As a design engineer, you are required to design that shaft with neglecting the weight of the elements on the shafts and using AISI 5140 OOT1000 for the shaft Table I Gear Diametral PitchPitch Diameter (mm) Number of teeth Face Width (mm 38.1 76.2 50.8 12 24 12 19.05 19.05 25.4 25.4 6152.4 36

Answer 1