Basic Gear Types Helical Gears ME350 Helical gears are similar to spur gears but have teeth inclined to the axis of rotation. 11
ME 350 11 Helical gears are similar to spur gears but have teeth inclined to the axis of rotation. Basic Gear Types – Helical Gears
Basic Gear Types-Bevel Gears ME350 Bevel gears have teeth formed on conical surfaces and are used mostly to transmit motion and power between intersecting shafts
ME 350 12 Bevel gears have teeth formed on conical surfaces and are used mostly to transmit motion and power between intersecting shafts. Basic Gear Types – Bevel Gears
Basic Gear Types -Worm Gears ME350 Worms and worm gears are used to transmit motion and power between nonparallel, nonintersecting axes
ME 350 13 Basic Gear Types – Worm Gears Worms and worm gears are used to transmit motion and power between nonparallel, nonintersecting axes
Spur Gears2,5 ME350- Effective low cost DO00000000000000 means for transmitting AAAAA motion and power between parallel (a)Spur gear with (b)Spur gear with (c)Rack-straight spoked design solid hub spur gear shafts. O.D.Outside diameter P.D.Pitch diameter F=Face width L=Length of hub P=Extension of hub beyond face Solid Thinned web Spoked (d)Gear blank styles H=Hub diameter Dedendum Addendum circle FIGURE 13-14 Intemal gear and pinion
ME 350 14 Spur Gears2,5 Effective low cost means for transmitting motion and power between parallel shafts
Helical Gears3 ME350- .Formed from rolling cylinders .Can perform essentially same function as spur gears,connecting parallel shafts for speed reduction/increase and torque increase/reduction. .Teeth angled with respect to the axis of a helix angle >Can be a few degrees or as much as 45 degrees. 15
ME 350 15 Helical Gears3 •Formed from rolling cylinders •Can perform essentially same function as spur gears, connecting parallel shafts for speed reduction/increase and torque increase/reduction. •Teeth angled with respect to the axis of a helix angle ¾Can be a few degrees or as much as 45 degrees