190303ja Flashcards
Functions of the drive axle?
Support weight
Withstand operating stress
Changes power flow by 90 degrees
Final gear reduction
5:1 ratio
Reduction or overdrive
Reduction.
If input is larger then output it’s a reduction
How do you add up gear reductions
Multiply the ratios
How does a diff divide power side to side
Power is always equal side to side
What’s the function of the carrier
Holds the diff assembly input and bevel gears
Semi floating vs floating axle
Floating axle does not support the unit. Can be removed with the vehicle still on the ground
How is power transferred through the double reduction?
Input is the sun gear on the first set. The carrier is the output. The carrier (output) is also connected to the sun gear of the second planetary set (input) Reducing the torque again.
Difference between inboard and outboard planetary?
Inboard is part of the carrier assembly. Requires larger axles.
Outboards have large final drives and smaller axle inputs
Does a diff proportion torque?
No. Torque is ALWAY equal side to side. So if one wheel is spinning the wheel that’s not spinning only gets the torque required to spin the free wheel
Is input rpm ever lost?
No. Rpm of the input is plot between the 2 axles. I E 100 rpm input = 50 rpm on either axle.
What happens when one side axle losses rpm?
The other side has to pick up the lost rpm. So if input rpm is 100. Right side is 40. Left side rpm must be 60
What are the 3 styles of pinion inputs
Amboid- pinion above Centre line
Centreline- pinion right in the Centre
Hypoid- pinion below the Centre line
What are the 2 ways to mount the pinion
Over hung - only has 2 bearings in the carrier
Straddle mount - pinion has a stub shaft and a 3 Ed beaming inside the carrier
Does a transfer case compensate for speed.
No
What does a transfer case use to compensate for speed
An inter axle differential
