Basics
Gear teeth mesh along this dividing line
Pitch line
An example of a partial non-hunting gear ratio
Any number ending in .25 , .50 , or .75
The term for the member that is either stationary or turns at a controlled rate
Reactionary member
An axle shaft that supports some of the machine's weight is termed this
Semi-floating (additionally, 3/4 floating)
A final drive with a 40:1 ratio receives 2,000lb-ft of torque. It's output torque is ______
80,000lb-ft
The term for the part of the gear tooth on a bevel gear that is closest to the inner diameter
Toe
An internal and external gear in mesh turn in the ________ direction.
same
The speed & condition produced by:
Input - Sun , Output - Ring (Internal)
1st Speed Reverse
The solution to insufficient pinion bearing preload
Thinner spacer between bearings
Inboard mounted
The output torque of a 5:1 gear set with an input torque of 150lb-ft
5 * 150 = 600lb-ft
These gears are expensive to manufacture and very strong, they have two sets of angled teeth and produce no axial loads
Double helical or herringbone
2 methods of achieving direct drive
#1 Lock two components TOGETHER
#2 Drive 2 components @ SAME RPM
A standard open differential causes speed and torque to do this in a wheel spin condition
Speed doubles, torque halves
In a spur gear double reduction final drive, the gears between the input pinion and output bull are termed this
Intermediate gears
The gear ratio of a 40t drive gear, and 20t driven gear
DRVN/DRV = 20/40 = 1/2 = 0.5:1
"Spiral bevel", "Amboid", and "Hypoid" are terms used to describe the configuration of this gear set
Angle drive
The speed & condition produced by:
Held - Sun, Output - Internal (Ring)
2nd Speed Overdrive
The required steps to result in an increased backlash adjustment
#1 Loosen flanged case half adjusting ring
#2 Tighten plain case half adjusting ring
#3 Measure for proper backlash
Torque available at each axle of a motor grader 1.5:1 chain final drive if the input sprocket has 1000lb-ft
1000lb-ft / 2 chains = 500 lb-ft
500 lb-ft * 1.5:1 ratio = 750lb-ft
The function of an idler gear through radial plane vs axial plane
Horizontal - change rotation direction / take up space
Vertical - same, additionally: changes gear ratio
This type of gearset typically has an incredibly high gear ratio and is often used in winch drives.
Worm & Wheel
This condition is produced by the following: 2 members rotating in opposite directions at the same tooth speed
Neutral
The shim adjustment needed to replace a +2 pinion with a -2 pinion on an integral mounted pinion
ADD 0.004" to bring pinion CLOSER to bevel
This type of final drive is most likely to be used on a haul truck due to weight concerns
Planetary