[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Torsen 201- slip v slop

In a message dated 11/2/99 1:31:24 PM Central Standard Time, OorQue writes:

> Unfortunately, there is enough slop between the various gear interfaces 
> the locked center diff doesn't behave exactly the same as a pure spool does 
> . it's close but not quite.  Also, remember that with both versions of the 
> Type 016 transmission -- with the Torsen center and with the locking center 
> diff -- there is a substantial difference in length between the forward- 
> rearward-running driveshafts, with the rear one being quite a bit longer 
> think about what this means for a while.  :^)
>  JG
Not sure of the relevency of gear slop.  We could argue that the dogs in a 
locked center have slop, but not slip.  Why?  Let's look at the definition of 
gear slop:  The application of acceleration torque on a set of "locked" gears 
VS the application of braking (deceleration) torque on a set of locked gears 
= x angle, x time, x distance of rotation.  Since 885140 and the torsen 
(/locker) models presented are for applied acceleration, there isn't any slop 
in the dog gears.  Why?  Cuz all slop is gone immediately upon application of 
Trg OR immediately upon turning radius input.  Slip would indicate that WHILE 
the torque is allocated driveshafts can rotate at different speeds.

So, I would argue that the locker behaves EXACTLY like a spool with 
accleration torque applied.  There is a moment where a coast or a lift 
introduces gear slop, but all arguments presented to date are for applied 
acceleration torque only.  If we introduce a coast or a decel variable into 
the variables, the torsen also behaves completely differently as well, with 
differing BR.

Regarding driveshaft length.  Time delay between traction input rear and  
front, and traction output rear v  front?  

Scott Justusson