m Hffi S4rI ffi ffi ffi ,H 1 a:i 1 Ain Shams University Faculty of Engineering Design & Prod. Ene. De Third Year Mechanical Power 13-June-2001 Time allowed :3 hours Machine Constructi on (2 * Students may assume any missine data The sketch shows the layout of double stage reduction gear unit. The gears were designed according to the data given in the following table. You are required to: o Estimate the maximum horsepower transmirted by the gears based on wear resistance, if the unit is expected to work for l0 years, 325 days/year and 16 hoLrrs/day. ' Calculate the reactions at the supporting bearings for the input shaft and estimate its dynamic capaciry . Present a Free Hand Sketch for the Gear Unit. tlw uv4l f_/lllL. Pa rameter Bevel Stage Helical Stase Pinion Gear Pinion Gear Module, nrni 8 8 4 4 Nornral module, mm 8' 8 3.5 3.5 R.P.M. I 500 750 750 300 Number oIteeth l5 30 30 75 Tooth width, mm 64 64 80 80 Material Ulttr"i. rt,.sq tglm# Wear stress factor, kg/mm GG 26 GG 18 c4s sr 70 26 l8 90 70 0. 10 0.10 0.1 3s 0.1 3s v.io9{L!1!!9t 0.39 0.39 0.55 0.s6 I Speed factor 1.6 1.6 1.13 t.43 Plan View I tiltrrrat. rt t. I \1/pr' "t.o.o E.xaminer: Asso. Prof .l Heshum Alv Senbel
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Ain Shams UniversityFaculty of EngineeringDesign & Prod. Ene. De
Third Year Mechanical Power13-June-2001Time allowed :3 hours
Machine Constructi on (2* Students may assume any missine data
The sketch shows the layout of double stage reduction gear unit.The gears were designed according to the data given in the following table.
You are required to:o Estimate the maximum horsepower transmirted by the gears based on wear
resistance, if the unit is expected to work for l0 years, 325 days/year and 16hoLrrs/day.
' Calculate the reactions at the supporting bearings for the input shaft andestimate its dynamic capaciry
. Present a Free Hand Sketch for the Gear Unit.tlw uv4l f_/lllL.
Pa rameter Bevel Stage Helical StasePinion Gear Pinion Gear