GEAR DESIGN Part IV GEAR FORMS Prof Dr

GEAR DESIGN Part “IV” (GEAR FORMS) Prof. Dr. Mohamed Omar Mousa El-Minia University Prod. & Mech. Design Dept. Prof. 1 Dr. Mohamed Omar Mousa April 2006

GEAR SHAPES Gear 1 Gear 2 Washer Parallel sides key Pin Prof. 2 Dr. Mohamed Omar Mousa April 2006

Holes keyway Gear 2 Extended Hub Gear 3 Prof. 3 Dr. Mohamed Omar Mousa April 2006

Gear 3 Prof. 4 Dr. Mohamed Omar Mousa Gear 4 April 2006

Gear 4 Prof. 5 Dr. Mohamed Omar Mousa Gear 5 April 2006

Build-in gear Gear 1 Prof. 6 Dr. Mohamed Omar Mousa Disc Form Gear 2 Disc & Holes Form Gear 3 April 2006

Build-in web Gear 4 Prof. 7 Dr. Mohamed Omar Mousa Build-in web& Holes Gear 5 April 2006

Large Gear Wheels 1. Taper shaft end and nut Gear Tapered shaft end Gear Washer Keyway Thread Prof. 8 Dr. Mohamed Omar Mousa Nut April 2006

2. Shoulder and nut Shoulder Prof. 9 Dr. Mohamed Omar Mousa April 2006

3. Shoulder and face plate 2 Screws Prof. 10 Dr. Mohamed Omar Mousa April 2006

3. Shoulder giphead key Prof. 11 Dr. Mohamed Omar Mousa April 2006

Compound Gears Gear 1 Prof. 12 Dr. Mohamed Omar Mousa Gear 2 April 2006

Compound Gears Gear 1 Prof. 13 Dr. Mohamed Omar Mousa Gear 2 April 2006

Compound Gears Flange with 4 Holes Gear 1 Prof. 14 Dr. Mohamed Omar Mousa Gear 2 April 2006

Compound Gears Gear 1 Gear 2 Gear 3 Prof. 15 Dr. Mohamed Omar Mousa April 2006

Some Special Gears (1). Two directional gear train Design 40 - Gear Two Directional (2). Non-circular gears Design 41 - Gear Non-circular gears (3) Change speed gears Design 42 - Gears changes speed Prof. 16 Dr. Mohamed Omar Mousa April 2006

Prof. 17 Dr. Mohamed Omar Mousa April 2006

Spur Gear reduction Unit. -Single Stage. - Spur gear. -Speed ratio 4 to 10. -Pinion. -Gear is disc with reduction weight holes. - Glass oil –level indicator. Prof. 18 Dr. Mohamed Omar Mousa April 2006

-Single Stage. - bevel gear. -Two perpendicular shafts -Speed ratio 4 to 10. -Pinion is over-hanged. -Gear is Keyed. - Glass oil –level indicator. Prof. 19 Dr. Mohamed Omar Mousa April 2006

Gear & Pulley construction B Gear and pulley masses are subjected to shear stress due to torque. The following relationships can be considered. 1. Single raw webs are used for gears or pulleys with width “B”: B ≤ 300 mm 2. Double raw webs are used for: B ≥ 300 mm Prof. 20 Dr. Mohamed Omar Mousa April 2006

a’ B L = (1. 5 : 2 ) * d d : Shaft bore diameter. L : Hub length d 1 = 1. 7 d d 1 : Hub external diameter. No. of Webs “i” i = (1/7) √ Dmax : Gear or pulley external diameter Prof. 21 Dr. Mohamed Omar Mousa April 2006

a’ B Dimensions of web section P: Acting force For gear P = torque / (d 1/2) For Pulley P = (T 1 – T 2) a = 0. 4 h a’ = 0. 75 a h’= 0. 75 h Prof. 22 Dr. Mohamed Omar Mousa April 2006

Prof. 23 Dr. Mohamed Omar Mousa April 2006

Prof. 24 Dr. Mohamed Omar Mousa April 2006

Prof. 25 Dr. Mohamed Omar Mousa April 2006

EN D Prof. 26 Dr. Mohamed Omar Mousa April 2006