Re: Torsen Threads <*all*>

[QSHIPQ@aol.com]

In a message dated 10/20/99 10:33:55 AM Central Daylight Time, 
quk@isham-research.demon.co.uk writes:

> 
>  The torque distribution, until one axle slips, is 50/50.  The axles
>  rotate at different speeds in a turn, and with equal torque delivery
>  there is certainly a _POWER_ split.  But not a _TORQUE_ split - that's
>  entirely an internal consideration.
>  
>  The Torsen doesn't care about corners.  It can't 'see' corners - it
>  has no sensors whatever.  All it has is an input shaft supplying
>  torque and two output shafts to which it delivers that torque.
>  

NO.  Phil, you can't be anymore wrong.  885140 "Vehicle Behavior When 
Acclerating in a Turn: (.9cf, max load, 80q) "...  However, the front wheels 
follow a wider radius that the rear wheels on the circular course, so that 
.2% forced slip occurs between the two axles, which reduces the wheel slip 
under traction at the front wheels. and increases the slip at the rear 
wheels.  This results in the tractive forces being distributed towards the 
rear wheels, so that the tractive force distribution is 38/62%....  On a high 
grip surface the torque split limit (75/25) is reached at a radius of about 
15meters....  However, if the wheels of one axle reach the limit of adhesion, 
the drive torque is diverted to the other axle (within the range of the 
torque split limits), independent of the forced slip rsulting from the 
vehicles circular path."

There are two inputs to torque allocation in a Torsen diff:  1)  Traction and 
 2)  relative slip angles.  This is a basic torsen center differential 
property.

Scott Justusson