Gearing Fundamentals Flashcards
Lubrication type for open gear system
Thick oil or grease
Matched pair of gears manufactured together and intended to mate with each other
gear set
When two or more gears mesh together as a unit
gear train
When two gears have different number of teeth mesh, the gear with the fewer teeth is called this
Pinion
In bevel and hypoid gear the larger ring is called this
Crown gear
Term when larger gear drives smaller gear, less torque, more speed
speed increaser
Term when a smaller gear drives a larger gear, more torque but less speed
speed reducer
gear supported on one bearing only
overhung gear
gear mounted between two bearings
straddle mounted gear
term for three or more shafts and four or more gears
compound gear train
Term when the gear or shaft is allowed to move axially
end play
A bearing in a gearbox is done by giving the bearing less than zero axial clearance
preload
When a gear or shaft is allowed to move axially to its best position
floating gear or shaft
What gears should be set floating
double helical
herringbone
Two most common contact angle for gear teeth
14.5 and 20
Strongest pressure angle for gear tooth
20
Speed for straight profile tooth
Low speed
Gears mounted in parellel
spur
helical
double helical
herringbone
gears mounted intersecting
bevel
miter
gears mounted crossing over at 90 degrees
worm
hypoid
helical gears of the same hand
gears with straight cut teeth used only in parellel
spur gears
When spur gear cut on a linear surface
rack and pinion
Gear teeth cut on an angle, stronger for more teeth contact
helical gear
Gear with 2 rows of opposite angled teeth separated by a space. The axial thrust is cancelled by the opposing teeth
double helical gear
Gear with a V tooth design, used for high speed and heavy loads
Herringbone gear
Shafts with intersecting axes require these gears
Bevel gears
Bevel gear that intersects at 90 degrees
miter gear
Bevel gear with straight teeth
Straight bevel
Beveled gear with angled cut and curved teeth, more tooth in contact
Spiral bevel gear
Beveled gear with straight cut but curved teeth, no axial thrust
Zerol bevel gear
Bevel gear that forms a drive between two shafts that cross over at 90 degree
hypoid gear
Gears that work like a screw thread, application where high ratio reduction required in small area
worm gear
3 parts to a planetary gear system
sun
carrier
ring
