Gear Test Questions Flashcards
Mitre gears have a ratio of what
1:1
Helical gear rotation is determined by what?
Direction of rotation is determined by the rotation of the shaft, change in rotation will change thrust load.
Straight bevel gears Mounted at an angle other than 90° are called?
Angler Bevel gears
Zeorl bevel gears have no?
Axial trust
What is the shaft set up in a worm and worm wheel set up?
Crossing over but not on the same plane
Pitch x no# starts=?
Lead
What has maximum contact in a worm and worm wheel set up?
Double throated has maximum contact
If no components are held in a planetary gear box this is in what position?
Neutral
Where do you measure backlash?
At the pitch Circle half way up to the tooth
Talking arms are used for what?
Turnbuckles stop gear boxes from rotating and tension belt.
Must be mounted 90° from the output point.
What type of chain is used?
Positive infinely variable, laminated leaf chain?
What is it called when you measure center to center on a tooth to another tooth
Circular pitch
What do you shim in a worm and worm wheel set up?
Worm wheel
Where do you measure backlash
At circular pitch
What pattern is worm and worm wheel have?
Same hand ( anything crossing over has the same hand
For a compound set up what is the minimum shaft and minimum gears required?
3 shafts 4 or more gears
What is the gear ratio of a mitre gear
1:1 same amount of teeth
Which gears have no axial thrust
Double helical or herringbone
If pressure points are kept the same from a throated gear to a non-throated gear what would happen?
Hi a pressure points on a non-throated gear
teeth divided by dia=
Dp
starts divided by # of teeth on wheel=
Ratio
What are the two common pressure angles
14.7° and 20°
What bearings do you use on a worm gear
Tapered roller bearing
Rolling action at the pitch line
Meshing action starts sliding to rolling back to sliding and the rolling happens at the pitch line. Lol
Worm gear has greater friction or less friction
Has greatest friction
Where do you not use an oil with EP additives
Spur gears
Where would you use a hydraulic piston
For wet disc
