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- From: tquinn@heartland.bradley.edu (Terry Quinn)
- Newsgroups: rec.autos.tech
- Subject: Re: Limited-Slip differentials??
- Date: 31 Dec 1992 12:48:49 -0600
- Organization: UTexas Mail-to-News Gateway
- Lines: 41
- Sender: daemon@cs.utexas.edu
- Message-ID: <9212311848.AA07517@heartland.bradley.edu_>
- Reply-To: tquinn@heartland.bradley.edu
- NNTP-Posting-Host: cs.utexas.edu
-
-
-
- > Hello---Could someone please elaborate on the advantages of a limited-slip
- > differential? What about its internals? How does it differ from a
- > usual differential?
-
- Limited slip differentials use different mechanical approaches,
- but most use a clutch and spring mechanism to apply a slight
- torque that tends to resist the differentiating action (relative
- speed between the two axles). As the input torque to the
- differential increases, the separating force from the differential
- pinion/side gear mesh tends to increase the face load on this
- clutch, increasing its capacity.
-
- As you know, on a turn the two tires on the same end of the car
- must travel at different speeds or the car will fight the turn and
- there will be excessive tire wear. A conventional "open"
- differential equalizes torque to each wheel and allows them to
- find their own speed. On a limited slip unit, in a normal turn,
- where the input torque is low, the differential clutch slips,
- allowing one tire to rotate faster than the other.
-
- In other situations however, such as during hard acceleration, the
- input torque is greater, and hence the differential clutch
- capacity increases. This further restricts the relative motion
- between the two axles, maintaining similar speeds for both tires,
- even if there is a significant difference in torque on the two
- sides. This is obviously helpful in high performance cars to
- maximize traction. It is also somewhat beneficial on any car
- which experiences slippage on one side or the other (icy patches).
- In the latter case, it is sometimes necessary to partially apply
- the parking brake to develop enough load on the differential to
- activate its limited slip characteristics and get you out of the
- stuck spot.
-
-
- --
- Terry Quinn
- Germantown Hills, IL
- tquinn@heartland.bradley.edu
- from Compuserve . . . >INTERNET: tquinn@heartland.bradley.edu
-