Dodge Sprinter 2006 Manual page 1920

21 - 182 AUTOMA TIC TRANSMISSION NAG1 - SERVICE INFORMA TION
• Tr a n sm ission flu id t em per a t u r e
• E n gin e coola n t t em per a t u r e
• In pu t speed
• Th r ot t le a n gle
• E n gin e speed
OPERA TION
Fig. 248 Torque Converter
1 - TURBINE
2 - IMPELLER
3 - STATOR
4 - INPUT SHAFT
5 - STATOR SHAFT
6 - TURBINE DAMPER
Th e con ver t er im peller (dr ivin g m em ber ) (2) (F ig.
248), wh ich is in t egr a l t o t h e con ver t er h ou sin g a n d
bolt ed t o t h e en gin e dr ive pla t e, r ot a t es a t en gin e
speed. Th e con ver t er t u r bin e (dr iven m em ber ) (1),
wh ich r ea ct s fr om flu id pr essu r e gen er a t ed by t h e
im peller, r ot a t es a n d t u r n s t h e t r a n sm ission in pu t
sh a ft (4).
TURBINE
As t h e flu id t h a t wa s pu t in t o m ot ion by t h e im pel-
ler bla des st r ikes t h e bla des of t h e t u r bin e, som e of
t h e en er gy a n d r ot a t ion a l for ce is t r a n sfer r ed in t o t h e
t u r bin e a n d t h e in pu t sh a ft . Th is ca u ses bot h of t h em
(t u r bin e a n d in pu t sh a ft ) t o r ot a t e in a clockwise
dir ect ion followin g t h e im peller. As t h e flu id is lea v-
in g t h e t r a ilin g edges of t h e t u r bin e's bla des it con -
t in u es in a "h in der in g" dir ect ion ba ck t owa r d t h e
im peller. If t h e flu id is n ot r edir ect ed befor e it st r ikes
t h e im peller, it will st r ike t h e im peller in su ch a
dir ect ion t h a t it wou ld t en d t o slow it down .
STA TOR
Fig. 249 Stator Operation
1 - DIRECTION STATOR WILL FREE WHEEL DUE TO OIL
PUSHING ON BACKSIDE OF VANES
2 - FRONT OF ENGINE
3 - INCREASED ANGLE AS OIL STRIKES VANES
4 - DIRECTION STATOR IS LOCKED UP DUE TO OIL PUSHING
AGAINST STATOR VANES
Tor qu e m u lt iplica t ion is a ch ieved by lockin g t h e
st a t or 's over-r u n n in g clu t ch t o it s sh a ft . (F ig. 249)
Un der st a ll con dit ion s (t h e t u r bin e is st a t ion a r y), t h e
oil lea vin g t h e t u r bin e bla des st r ikes t h e fa ce of t h e
st a t or bla des a n d t r ies t o r ot a t e t h em in a cou n t er-
clockwise dir ect ion . Wh en t h is h a ppen s t h e over-r u n -
n in g clu t ch of t h e st a t or locks a n d h olds t h e st a t or
fr om r ot a t in g. Wit h t h e st a t or locked, t h e oil st r ikes
t h e st a t or bla des a n d is r edir ect ed in t o a "h elpin g"
dir ect ion befor e it en t er s t h e im peller. Th is cir cu la -
t ion of oil fr om im peller t o t u r bin e, t u r bin e t o st a t or,
a n d st a t or t o im peller, ca n pr odu ce a m a xim u m
t or qu e m u lt iplica t ion of a bou t 2.0:1. As t h e t u r bin e
begin s t o m a t ch t h e speed of t h e im peller, t h e flu id
t h a t wa s h it t in g t h e st a t or in su ch a s wa y a s t o
ca u se it t o lock-u p is n o lon ger doin g so. In t h is con -
dit ion of oper a t ion , t h e st a t or begin s t o fr ee wh eel
a n d t h e con ver t er a ct s a s a flu id cou plin g.
VA