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LSD clutch type vs viscous type?
Posted 06 November 2003 - 01:03 AM
Posted 06 November 2003 - 05:11 PM
They are a sealed unit with thin closely spaced (not touching) discs that have holes and slots in them. The odd numbered disks are attached to one shaft, the even number discs to the other shaft. The whole unit is filled with a silicone oil.
Silicone oil (fluid) thickens dramatically when it heats up. There is a huge swing in the viscosity around 100C. If both wheels are turning at the same speed, the discs are as well, there is no relative movement between the disks and the fluid is at it's low viscosity, allowing slight movement for turns, etc. When one wheel spins, there is relative movement between the discs, the fluid is sheared, it heats up, thickens and "locks" the plates together, thereby transferring torque to the wheel with grip. This happens very rapidly, but not instantaneously.
The center differential in most manual transmission Subaru's use a VC to power the drive shaft to the rear wheels. (Auto's have the clutch pack.)
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