Transcript Tim Kwan

Limited Slip Differentials
(LSDs)
By: Timothy Kwan
Objective
• Explain what a limited slip
differential (LDS) is
• Types of LSDs and how they
work
What is an LSD?
• Prevent wheel slippage
• Distributes torque to wheel that
isn’t slipping
• LSDs lock or slow down
rotation of one output axel
Types of LSDs
• 3 Main Types:
– Clutch
– Viscous Coupling
– Torsen®
Clutch Type LSD
• Locks up using clutches
Gear shaft
From driveshaft
Pressure plate
Clutch plates
To right wheel
To left wheel
Clutch LSD con’t
Vehicle stationary
Pressure plate
Vehicle turning
Clutch disk (not shown)
Straight line driving
Viscous Coupling LSD
• Locks up due to friction
between fluid and plates
To right wheel
Viscous coupling
From driveshaft
To left wheel
Viscous Coupling con’t
From driveshaft
Viscous coupling unit
Differential
Stationary plates
fluid
Rotating plates (attached to shaft)
Torsen® LSD
• Locks up using gears
Worm gear
From driveshaft
To left wheel
To right wheel
Worm wheel
Torsen® LSD con’t
References:
• http://www.billzilla.org/diffs.htm
• http://www.autozine.org/technical_school/traction/t
ech_traction_4wd_2.htm
• http://www.arstechnica.de/auto/differential/bauarte
n/viscokupplung.html
• http://www.popularmechanics.com/automotive/aut
o_technology/1302716.html?page=4&c=y
• http://auto.howstuffworks.com/differential.htm