Examiner: Prof.r Hesh am Aly Sonbol You are asked to: ! r-":r.-0-!r.:.:··:;:~c ::::<1 number of-the V-belts based on the motorcapacity .: _ :..: 120 Marks] 2- Find the helical gearsmaterial based on static strength only _ [20 Marks] 3- Calculate the bearing capacity for the output shaft for the gear unit if the expected life. is 20000 hr. [20 Marks] 4- (beck the strength of the 40 rnm diameter output gear unit shaft if its material is St 42 [15 Marks] 5- Draw a constructional drawing for the gear unit assembly : [30 Marks] iliestion 2: [20 Marks] A bevel gear assembly as shown in Figure (2) working under the following con-ditions: .. Bearings i\: and 13:60xl30x31x34 (C=6IKN), Rearing C: 70~170x5l (C=132KN). The thrust arising from the straight bevel gear of diameter 80 111111 and rotating at 1200 rpm is 6KN" Spcci ficaiions of threaded end of shaft: M48x4, core diameter=4).1 mrn, height of nut = 38111111 .. T: True F: Falls . IJ__: AJI ron~0>Larings. are roiling bearings bUI not all rolling bearings are !oller bearings. ('I".o_r..£.L_J-· ! 2 ! 1'1...: s!ll)Wn system should be lubricated using grease. (T or F). ! ~-.~ .,n·;;~illg~ "A" and "B" are termed: cylindrical~~lf-a_ligning· or tapercd-=--' ---=~ ! 4 ! The detachable bearing is "A" or "13" or "C" or all of them. f·:) ;~The ,~dia,-loaion the shaft is carried by: three bearings or t-w-o-b-e-a-ri·-n-gs-or-oJ~ bearing~ ~=__] ,6 ! The axial load on the shaft is carried bv: bcarinz "A" or "B" or "C". • _._ ._- ---- .--- ._-----_ ..__-_ p ._--- ._----. -------- ----, :~7__I Fk;JJ~IHs."C' i~ fix~d frolll its lour side~ and t~~s ShO_L~ld be the locating bearing. (T <?r_F)_ .._ I ! X The threads of [he threaded part of the shaft arc subjected to an axial torce equal 6KN. (T or F) I ~J? ..j Tile lhr~L~t car:ied by each bearing.= 2 KN. (T o·;!f"6)mment . . --- ... =~! ! 10 Calculate the thrust actina on each bolt of the 4 bolts fixing the cover f) to the housing. I • 4•• • __ _ _ _ .__ _ •__ • Gear Center distance 200 !TIm Pressure angle _.:. ~_Qo _ Belt center distance 400 mm Tooth width 20 rom Motor output speed 1800 rpm Gear/Pinion teeth 150/50 Hell speed ratio- 3:·1 Smaller pulley diam. : )00 rnrn Coefficient offrietion 0.2 The iJarticulars of the drive arc as follows: Question 1: [105 Marks] The attached sketch, Figure (1), shows the layout of a Helical Spur Gear Reducer which it has to be in't~\II::~d up-side for a special application in factory. Power is supplied to the unit through an electric motor or:, K wand a V-bclt drive. The output of the unit is finally delivered to a conveyor through a system of fla: belt. ,c ••••••••••••••••••••••••••••••••••••••••••••• c •• ~ ••• a •••••••••••••••••••. Machine Construction and Design of Machine Equipment ---- ----.--------~~----------------------~--~---------------- __ • Students may assume any missing data. • Constructional drawings should he fully dimensioned with machining symbols and classes offits clearly indicated. Time: 3 Hours Maximum mark = (125) AIN SHAMS UNIVERSITY FACULTY OF ENGINEERING DESIGN & PRODUCTION ENG!NEERING DEPARTMENT Third Year Mecltqnical, Power Section - , .
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Examiner: Prof.r Hesh am Aly Sonbol
You are asked to:! r-":r.-0-!r.:.:··:;:~c::::<1 number of-the V-belts based on the motorcapacity .: _ :.. : 120 Marks]2- Find the helical gearsmaterial based on static strength only _ [20 Marks]3- Calculate the bearing capacity for the output shaft for the gear unit if the expected life.
is 20000 hr. [20 Marks]4- (beck the strength of the 40 rnm diameter output gear unit shaft if its material is St 42 [15 Marks]5- Draw a constructional drawing for the gear unit assembly : [30 Marks]
iliestion 2: [20 Marks]A bevel gear assembly as shown in Figure (2) working under the following con-ditions: ..Bearings i\: and 13: 60xl30x31x34 (C=6IKN), Rearing C: 70~170x5l (C=132KN). The thrust arisingfrom the straight bevel gear of diameter 80 111111 and rotating at 1200 rpm is 6KN"Spcci ficaiions of threaded end of shaft: M48x4, core diameter=4).1 mrn, height of nut = 38111111..T: True F: Falls .IJ__: AJI ron~0>Larings. are roiling bearings bUI not all rolling bearings are !oller bearings. ('I".o_r..£.L_J-·! 2 ! 1'1...: s!ll)Wn system should be lubricated using grease. (T or F). !~-.~.,n·;;~illg~"A" and "B" are termed: cylindrical~~lf-a_ligning· or tapercd-=--' ---=~! 4 ! The detachable bearing is "A" or "13" or "C" or all of them.f·:) ;~The,~dia,-loaion the shaft is carried by: three bearings or t-w-o-b-e-a-ri·-n-gs-or-oJ~bearing~ ~=__],6 ! The axial load on the shaft is carried bv: bcarinz "A" or "B" or "C".• _._ ._- ---- .--- ._-----_ ..__ -_ p ._--- ._----. -------- - ---,:~7__I Fk;JJ~IHs."C' i~ fix~d frolll its lour side~ and t~~s ShO_L~ldbe the locating bearing. (T <?r_F)_ .._ I! X The threads of [he threaded part of the shaft arc subjected to an axial torce equal 6KN. (T or F) I
~J?..j Tile lhr~L~tcar:ied by each bearing.= 2 KN. (T o·;!f"6)mment . . --- ...=~!! 10 Calculate the thrust actina on each bolt of the 4 bolts fixing the cover f) to the housing. I• 4 •• • __ _ _ _ .__ _ • __ •
Gear Center distance 200 !TImPressure angle _.:. ~_Qo _Belt center distance 400 mmTooth width 20 rom
Question 1: [105 Marks]The attached sketch, Figure (1), shows the layout of a Helical Spur Gear Reducer which it has to bein't~\II::~d up-side for a special application in factory. Power is supplied to the unit through an electricmotor or:,Kwand a V-bclt drive. The output of the unit is finally delivered to a conveyor through asystem of fla: belt.
,c ••••••••••••••••••••••••••••••••••••••••••••• c •• ~ ••• a •••••••••••••••••••.
Machine Construction andDesign of Machine Equipment
---- ----.--------~~----------------------~--~----------------__• Students may assume any missing data.• Constructional drawings should he fully dimensioned with machining symbols and
classes offits clearly indicated.
Time: 3 HoursMaximum mark = (125)
AIN SHAMS UNIVERSITYFACULTY OF ENGINEERING
DESIGN & PRODUCTION ENG!NEERING DEPARTMENTThird Year Mecltqnical, Power Section
- ,.
@
I Figure 21
Motor
\ Pinjon
Flat belt Pu
Figu-re 1"',,..
Motor
v- Belti.-> .~
· il'facltille Design-January -2011- Third Year Mechanical, Power Section [Page ..