Ain Sbams University Faculty of Engineering Design & Prod. Ene. De Third Year Mechanical powd 23 - June -2002 Time allowed:3 hours - Students may assume any missing data constructional drawings shourd be fu[y cinacnsioncd with Trachining symb_orq and crasses of fits crearrylndicated. A speed Reduction unit which_feeds a packaging conveying system in a fr:!,y, is designed so as to allow for the foliowin!: l-The speed reducer is.to be coupled to an electrii motor rotating at 1500 rpm. 2-The speed of the packaging conveying belt is 0.1 m/s. The Speed Reduction Unit consists of two gear reductions (a Worm Drive and a Straight lpul Gear Drive) in addition ti a third reduction in the form of V-BeltDrive.Thesketchsho*sihelayoutorttrisunit' You are asked to: ' Find the Maximr* Hor..power that could be transmitted by the speed Reducer unit, allowing foi no overroad conditions o Present a Frec Hand sketch .for the speed Reducer unit addin* ,n. necessary suitable Rolling Bearing. t In your calculations consider the followig: Worm Gear Drivg. Modr-rlc, rnnr t4 l5 70 2s0 2 0.05 40 60 10 35 50 Preasure an11le. deg Worm pitch ditrmeter, mrn Worm lei:gth, mnr Worm starls Coefficient of friction between Number of gear teeth Allowable ture rise for the uint, Co Effective gear tooth width, mm . Gear rim material phBr, All. Bend. Shess, kg/mm2 Worm matrial NiSt, All. Bend. Stress, kg/mm2 .... 113
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Ain Sbams UniversityFaculty of EngineeringDesign & Prod. Ene. De
Third Year Mechanical powd23 - June -2002
Time allowed:3 hours
-Students may assume any missing dataconstructional drawings shourd be fu[y cinacnsioncd withTrachining symb_orq and crasses of fits crearrylndicated.
A speed Reduction unit which_feeds a packaging conveying system in afr:!,y, is designed so as to allow for the foliowin!:l-The speed reducer is.to be coupled to an electrii motor rotating at 1500 rpm.2-The speed of the packaging conveying belt is 0.1 m/s.
The Speed Reduction Unit consists of two gear reductions (a Worm Driveand a Straight lpul Gear Drive) in addition ti a third reduction in the form ofV-BeltDrive.Thesketchsho*sihelayoutorttrisunit'
You are asked to:' Find the Maximr* Hor..power that could be transmitted by the speed
Reducer unit, allowing foi no overroad conditions
o Present a Frec Hand sketch .for the speed Reducer unit addin* ,n.necessary suitable Rolling Bearing.
t In your calculations consider the followig:Worm Gear Drivg.
Modr-rlc, rnnr t4l5702s020.05406010
3550
Preasure an11le. degWorm pitch ditrmeter, mrnWorm lei:gth, mnrWorm starlsCoefficient of friction betweenNumber of gear teeth
Allowable ture rise for the uint, Co
Effective gear tooth width, mm .
Gear rim material phBr, All. Bend. Shess, kg/mm2Worm matrial NiSt, All. Bend. Stress, kg/mm2 ....