Four speed offset automatic overdrive transmission with ...

European Patent Office © Publication number: 0 0 3 9 9 3 6

Office europeen des brevets A 2

EUROPEAN PATENT APPLICATION

© Application number: 81103560.9 ©Int. CI.3: F 16 H 47 /08

^ B 60 K 17/16 @ Date of filing: 09.05.81

©Priority: 12.05.80 US 149063 « ©Applicant: FORD FRANCE SOCIETE ANONYME 344 Avenue Napoleon Bonaparte B.P. 307 F-92506 Rueil Malmaison Cedex(FR)

© Date of publication of application : 18.11.81 Bulletin 81/46 © Designated Contracting States:

FR © Designated Contracting States:

DE FR GB © Inventor: Bookout, Charles C. 5962 Trotter Lane

© Applicant: Ford-Werke Aktiengesellschaft Orchard Lake Michigan 48033(US) Ottoplatz 2 D-5000 Koln 21 (DE) © |nventor: Stockton, Thomas R.

4014 Earhart Road © Designated Contracting States: Ann Arbor Michigan 48105IUS)

DE

Applicant: FORD MOTOR COMPANY LIMITED ® Representative : Ritzkowsky, Harald, Dipl.-lng. Eagle Way Ford-Werke Aktiengesellschaft Patentabteilung Z/DRR-2 Brentwood Essex CM13 3BW(GB) ^™!r5? „ l r ^ D-5000 Kpln 21(DE)

. © Designated Contracting States: GB

© Four speed offset automatic overdrive transmission with lockup in direct and overdrive.

© A transaxle driveline for a wheeled vehicle having an engine and gear system on a common axis that is transverse with respect to the center plane of the vehicle and having tandem driveshafts for the traction wheels, a differential gear mechanism mounted on a countershaft situated in prallel relationship with respect to the axis of the engine, the diffe- rential drive gearing being located between multiple ratio planetary gear elements (12) of the driveline and hydrokinetic

N torque converter (10) and a compact clutch-and-brake (CLi, ^ CL2 andCL3 resp. andB2)arrangementforvariousratiosto

be shifted in the multiple ratio gear system within a transmis- (0 sion housing having a minimum axial dimension, the gearing W being adapted to provide fourforward driving ratios including O) an overdrive ratio and direct drive ratio, the latter having three

operating modes, one of which is fully mechanical, one of O which is hydrokinetic and the third of which is characterized CO by a split torque delivery path that is partly hydrokinetic and O partly mechanical.

o

Croydon Printing Company Ltd.

A transaxle driveline for a wheeled vehicle having an engine and gear system on a common axis that is transverse with respect to the center plane of the vehicle and having tandem driveshafts for the traction wheels, a differential gear mechanism mounted on a countershaft situated in prallel relationship with respect to the axis of the engine, the diffe- rential drive gearing being located between multiple ratio planetary gear elements (12) of the driveline and hydrokinetic torque converter (10) and a compact clutch-and-brake (CL,, CL2 and CL3 resp. B1 and B2) arrangement for various ratios to be shifted in the multiple ratio gear system within a transmis- sion housing having a minimum axial dimension, the gearing being adapted to provide four forward driving ratios including an overdrive ratio and direct drive ratio, the latter having three operating modes, one of which is fully mechanical, one of which is hydrokinetic and the third of which is characterized by a split torque delivery path that is partly hydrokinetic and partly mechanical.

GENERAL DESCRIPTION OF THE INVENTION

Our i n v e n t i o n c o m p r i s e s i m p r o v e m e n t s in a g e a r s y s t e m

Df the t y p e shown in E g b e r t p a t e n t No. 3 , 3 1 4 , 3 0 7 , S t o c k t o n

p a t e n t 3 , 3 0 0 , 0 0 1 and Ohno e t al p a t e n t No. 3 , 4 5 5 , 1 8 5 . The

gear s y s t e m of t he p r e s e n t d i s c l o s u r e , as in t he t h r e e r e f e r -

e n c e s i d e n t i f i e d h e r e , e m p l o y s a gea r s y s t e m h a v i n g two s u n

g e a r s , a d o u b l e s e t of p l a n e t p i n i o n s and a r i n g g e a r o u t p u t

member . The c l u t c h - a n d - b r a k e a r r a n g e m e n t i s s i t u a t e d in a

c o m p a c t a r r a n g e m e n t to p r o v i d e two u n d e r d r i v e r a t i o s , a t h i r d

d i r e c t d r i v e r a t i o wh ich has t h r e e o p e r a t i n g modes and a n

o v e r d r i v e f o u r t h r a t i o . The t o r q u e d e l i v e r y p a t h for t h e

o v e r d r i v e r a t i o i s f u l l y m e c h a n i c a l . By p r o p e r s e l e c t i o n o f

the c l u t c h and b r a k e e l e m e n t s , t he t h i r d g e a r r a t i o can b e

f u l l y m e c h a n i c a l a l s o , bu t i t is c a p a b l e a l s o of d i r e c t d r i v e

o p e r a t i o n w i t h a h y d r o k i n e t i c t o r q u e c o n v e r t e r in t h e t o r q u e

d e l i v e r y p a t h . In a t h i r d g e a r r a t i o o p e r a t i n g mode d u r i n g

d i r e c t d r i v e a p o r t i o n of t h e t o r q u e is d e l i v e r e d h y d r o k i n e t i -

c a l l y and the b a l a n c e is d i s t r i b u t e d m e c h a n i c a l l y , t h e r e b y

r e d u c i n g t he c o n v e r t e r s l i p and h y d r o k i n e t i c l o s s e s

c o n s i d e r a b l y .

The o u t p u t e l e m e n t of the g e a r s y s t e m is c o n n e c t e d t o

t o r q u e t r a n s f e r g e a r i n g h a v i n g an i n p u t e l e m e n t c o a x i a l l y

a r r a n g e d w i t h r e s p e c t to the a x i s of the g e a r i n g . At a l o c a -

t i o n b e t w e e n t he m u l t i p l e r a t i o g e a r i n g and the t o r q u e c o n v e r -

t e r , t he s t r a t e g i c p o s i t i o n i n g of the t o r q u e t r a n s f e r g e a r i n g

makes i t p o s s i b l e to use a d i f f e r e n t i a l g e a r i n g m e c h a n i s m f o r

c o n n e c t i n g the o u t p u t e l e m e n t of the t o r q u e t r a n s f e r g e a r i n g

to each of two a x l e s h a f t s in such a way t h a t the o p e r a t i n g

a n g l e of t he a x e s of the a x l e s h a f t s is r e l a t i v e l y s m a l l ,

t h e r e b y m a k i n g i t p o s s i b l e to use c o n s t a n t v e l o c i t y u n i v e r s a l

j o i n t s of known c o n s t r u c t i o n and to use s i m p l i f i e d v e h i c l e

t r a c t i o n w h e e l s u s p e n s i o n s .

BRIEF DESCRIPTION OF THE FIGURES OF THE DRAWINGS

F i g u r e 1 shows a s c h e m a t i c d i a g r a m of the t o r q u e

d e l i v e r y e l e m e n t s of the t r a n s a x l e of our i n v e n t i o n .

F i g u r e 2 is a c h a r t t h a t shows t h e e n g a g e m e n t a n d

r e l e a s e p a t t e r n fo r the c l u t c h e s and b r a k e s fo r t h e

t r a n s m i s s i o n s y s t e m of F i g u r e 1 .

F i g u r e s 3A and 3B show in c r o s s - s e c t i o n a l form a n

a s s e m b l y c o r r e s p o n d i n g to t he s c h e m a t i c d i a g r a m of F i g u r e 1 .

PARTICULAR DESCRIPTION OF THE INVENTION

In F i g u r e 1 r e f e r e n c e n u m e r a l 10 d e s i g n a t e s g e n e r a l l y

a h y d r o k i n e t i c t o r q u e c o n v e r t e r , r e f e r e n c e n u m e r a l 12 d e s i g -

n a t e s g e n e r a l l y m u l t i p l e r a t i o g e a r i n g , and r e f e r e n c e c h a r a c -

t e r 14 d e s i g n a t e s g e n e r a l l y t r a n s f e r d r i v e g e a r i n g f o r a

d i f f e r e n t i a l - a n d - a x l e a s s e m b l y .

C o n v e r t e r 10 i n c l u d e s a b l a d e d i m p e l l e r 16, a b l a d e d

t u r b i n e 18 and a b l a d e d s t a t o r 20. The i m p e l l e r , t he t u r b i n e

and the s t a t o r a re a r r a n g e d in a t o r u s c i r c u i t in the u s u a l

f a s h i o n and t h e i m p e l l e r 16 is c o n n e c t e d to the c r a n k s h a f t 2 2

of an i n t e r n a l c o m b u s t i o n e n g i n e , no t s h o w n . S t a t o r 20 i s

a d a p t e d to be b r a k e d by o v e r r u n n i n g b r a k e 24 to a s t a t i o n a r y

s l e e v e s h a f t 236 c o n n e c t e d to t r a n s m i s s i o n h o u s i n g 28. T h e

s t a t o r 20 i s a n c h o r e d a g a i n s t t he h o u s i n g d u r i n g o p e r a t i o n o f

the c o n v e r t e r in t h e t o r q u e c o n v e r s i o n r a n g e , b u t i t f r e e -

w h e e l s in known f a s h i o n d u r i n g o p e r a t i o n of t he c o n v e r t e r i n

the c o u p l i n g r a n g e . The g e a r i n g 12 i n c l u d e s a f i r s t sun g e a r 30, a s e c o n d

sun g e a r 32, a r i n g g e a r 34 and two s e t s of p l a n e t p i n i o n s 36

and 38. The p i n i o n s a re j o u r n a l l e d on a common c a r r i e r 40 s o

t h a t p i n i o n s 38 e n g a g e sun g e a r 30 and p i n i o n s 36 e n g a g e r i n g

g e a r 34. P i n i o n s of each s e t a l s o e n g a g e each o t h e r . The s u n

g e a r 30 is a d a p t e d to be c o n n e c t e d to t he t u r b i n e 18 t h r o u g h

s e l e c t i v e l y e n g a g e a b l e f r i c t i o n c l u t c h 42 to e s t a b l i s h l o w

s p e e d r a t i o o p e r a t i o n . C a r r i e r 40 at t h a t t ime a c t s as a

r e a c t i o n member s i n c e i t is b r a k e d by an o v e r r u n n i n g b r a k e 4 4 .

If c o a s t b r a k i n g or h i l l b r a k i n g is d e s i r e d , a f r i c t i o n b r a k e

46 can be a p p l i e d to a n c h o r the c a r r i e r 4 0 .

To e s t a b l i s h a s e c o n d u n d e r d r i v e s p e e d r a t i o , s u n

g e a r 36 i s b r a k e d by b r a k e 48. At t h a t t i m e the o v e r r u n n i n g

c o u p l i n g 44 f r e e w h e e l s . C l u t c h 50 is a p p l i e d a l o n g w i t h

c l u t c h 52 to e s t a b l i s h a d i r e c t , f u l l y m e c h a n i c a l d r i v e f r o m

the c r a n k s h a f t to the r i n g g e a r 34. If o n l y the c l u t c h e s 42

and 50 a r e a p p l i e d and c l u t c h 52 is r e l e a s e d , a d i r e c t d r i v e

c o n d i t i o n is e s t a b l i s h e d t h a t is f u l l y h y d r o k i n e t i c . T h e

c o n n e c t i o n b e t w e e n the c r a n k s h a f t and the r i g h t g e a r 34 i s

e s t a b l i s h e d by the t o r q u e c o n v e r t e r 1 0 .

I f o n l y the c l u t c h e s 52 and 42 a r e a p p l i e d and c l u t c h

52 is r e l e a s e d , a s p l i t t o r q u e d e l i v e r y p a t h is p r o v i d e d

t h r o u g h the g e a r s y s t e m . P a r t of the t o r q u e is d i s t r i b u t e d

. d i r e c t l y to the c a r r i e r 40 from the c r a n k s h a f t 22 t h r o u g h t h e

c l u t c h 52. The b a l a n c e of the t o r q u e is d i s t r i b u t e d t h r o u g h

the t o r q u e c o n v e r t e r and is d i s t r i b u t e d to t he sun g e a r 3 0 .

An o v e r d r i v e c o n d i t i o n is e s t a b l i s h e d by e n g a g i n g t h e

b r a k e 48 to a n c h o r the sun g e a r 32 and by e n g a g i n g the c l u t c h

52 t h e r e b y d i s t r i b u t i n g t o r q u e from the c r a n k s h a f t to t h e

c a r r i e r w i t h t h e sun g e a r 32 a c t i n g as a r e a c t i o n m e m b e r .

R e v e r s e d r i v e is a c h i e v e d by e n g a g i n g s i m u l t a n e o u s l y

b r a k e 46 and c l u t c h 50. With the c a r r i e r a c t i n g as a r e a c t i o n

m e m b e r , t u r b i n e t o r q u e is d i s t r i b u t e d to t he sun g e a r 32 a n d

r i n g g e a r 34 is d r i v e n in a r e v e r s e d i r e c t i o n .

The f i n a l d r i v e g e a r i n g 1 4 - i n c l u d e s a d r i v i n g g e a r 54

c o n n e c t e d d i r e c t l y to the r i n g g e a r 34. A f i n a l d r i v e o u t p u t

g e a r 56 is d r i v a b l y c o n n e c t e d to the d r i v i n g g e a r 54 t h r o u g h

an i d l e r g e a r 58 j o u r n a l l e d on a f i x e d a x i s .

In F i g u r e 2 t he c l u t c h e s and b r a k e s h a v e b e e n

d e s i g n a t e d by the s y m b o l s CL and B and the o v e r r u n n i n g

c o u p l i n g 44 is d e s i g n a t e d by the s y m b o l OWC. C o r r e s p o n d i n g

s y m b o l s a r e a p p l i e d to the s c h e m a t i c d i a g r a m of F i g u r e 1 w h e r e

t h e b r a k e 46 is d e s i g n a t e d B , b r a k e 48 is d e s i g n a t e d B 2 , c l u t c h 50 i s d e s i g n a t e d CL1, c l u t c h 42 is d e s i g n a t e d CL2 a n d

c l u t c h 52 i s d e s i g n a t e d C L .

As s e e n in F i g u r e 3B the c o n v e r t e r is s u r r o u n d e d b y

the h o u s i n g 28. H o u s i n g 28 is b o l t e d to t he c y l i n d e r b l o c k o f

the i n t e r n a l c o m b u s t i o n e n g i n e fo r the v e h i c l e . H o u s i n g

s u p p o r t w a l l 60 is b o l t e d or o t h e r w i s e s e c u r e d to i n t e r n a l

s h o u l d e r 62 in the h o u s i n g p o r t i o n 28. Wal l 60 i s i n t e g r a l

w i t h t he s u p p o r t s l e e v e 26 for the s t a t o r . A t u r b i n e s l e e v e

s h a f t 64 is s u p p o r t e d by b u s h i n g 66 in the s t a t i o n a r y s l e e v e

26. T u r b i n e hub 68 is s p l i n e d at 70 to t he s l e e v e s h a f t 64 a s

shown in F i g u r e 3A. A c e n t r a l d r i v e s h a f t 72 e x t e n d s t h r o u g h

s l e e v e 64 and i s s p l i n e d a t 74 to the hub of i m p e l l e r s h e l l 76

f o r the i m p e l l e r 16, s h e l l 76 i s c o n n e c t e d t h r o u g h d r i v e p l a t e

78 to e n g i n e c r a n k s h a f t 2 2 .

T u r b i n e s l e e v e s h a f t 64 is c o n n e c t e d a t 80 to s l e e v e

s h a f t 82 w h i c h f o r m s a p a r t of or is c o n n e c t e d to c l u t c h d r u m

84. The drum 84 d e f i n e s an a n n u l a r c y l i n d e r 86 w h i c h r e c e i v e s

a n n u l a r p i s t o n 88. C l u t c h p l a t e s 90 a r e s p l i n e d to sun g e a r

30 and c l u t c h d i s c s 92 a r e s p l i n e d to c l u t c h drum 84. When

p r e s s u r e is a d m i t t e d to t he c y l i n d e r 86, p i s t o n 88 t r a n s m i t s a f o r c e t h r o u g h B e l l e v i l l e s p r i n g l e v e r 94 to t h e c l u t c h d i s c s

and p l a t e s , t h e r e b y e s t a b l i s h i n g a c o n n e c t i o n b e t w e e n t h e

t u r b i n e and the sun g e a r 3 0 .

C a r r i e r 40 is c o n n e c t e d t h r o u g h d r i v e s h e l l 96 t o

c l u t c h drum 98 r o t a t a b l y j o u r n a l l e d and s u p p o r t e d on the r i g h t

hand end of the s h a f t 72. Drum 98 d e f i n e s an a n n u l a r c y l i n d e r

100 w h i c h r e c e i v e s an a n n u l a r p i s t o n 1 0 2 .

C l u t c h 52 i n c l u d e s f r i c t i o n c l u t c h p l a t e s 104 a n d

c l u t c h d i s c s 106 s p l i n e d , r e s p e c t i v e l y , to t h e s h a f t 72 a n d

t o t h e i n t e r i o r of t he drum 98. When the a n n u l a r c y l i n d e r 1 0 0

is p r e s s u r i z e d , a d r i v i n g c o n n e c t i o n i s e s t a b l i s h e d t h r o u g h

t h e c l u t c h 52 b e t w e e n s h a f t 72 and the c a r r i e r 40. C l u t c h 5 2

is e n g a g e d , as e x p l a i n e d p r e v i o u s l y , d u r i n g o v e r d r i v e o p e r a -

t i o n and d u r i n g o p e r a t i o n in the d i r e c t d r i v e modes d e s i g n a t e d

in F i g u r e 2 as d r i v e modes 3 ( a ) and 3 ( c ) .

O v e r r u n n i n g c o u p l i n g 44 is s i t u a t e d b e t w e e n the d r u m

98 and end c o v e r 108 . The c o u p l i n g 44 i n c l u d e s r o l l e r s 1 1 0

wh ich a re a d a p t e d to e n g a g e cam s u r f a c e s on the o u t e r r a c e 1 1 2

of the c o u p l i n g 44 to e s t a b l i s h a b r a k i n g a c t i o n in one d i r e c -

t i o n d u r i n g low s p e e d o p e r a t i o n .

The f r i c t i o n b r a k e 46 i n c l u d e s f r i c t i o n p l a t e s 1 1 4

and f r i c t i o n d i s c s 116 w h i c h a r e s p l i n e d r e s p e c t i v e l y to t h e

drum 98 and to the h o u s i n g p o r t i o n d e s i g n a t e d by r e f e r e n c e

n u m e r a l 118. An a n n u l a r c y l i n d e r 120 d i s p o s e d in the h o u s i n g

r e c e i v e s an a n n u l a r p i s t o n 122 wh ich e n g a g e s the f r i c t i o n

d i s c s and p l a t e s 116 and 114 when p r e s s u r e is a d m i t t e d to t h e

c y l i n d e r 120 . B r a k e 46 is a p p l i e d w h e n e v e r h i l l b r a k i n g i n

the low s p e e d r a t i o r a n g e is d e s i r e d . I t is a l s o e n g a g e d

d u r i n g r e v e r s e d r i v e o p e r a t i o n as e x p l a i n e d p r e v i o u s l y .

C l u t c h 50 i s a p p l i e d to c o n n e c t the s h a f t s 64 and 8 2

d u r i n g o p e r a t i o n in d i r e c t d r i v e and d u r i n g r e v e r s e d r i v e a s

e x p l a i n e d p r e v i o u s l y . C l u t c h 50 c o m p r i s e s c l u t c h drum 1 2 4 ,

wh ich d e f i n e s an a n n u l a r c y l i n d e r 126 . P i s t o n 128 is r e c e i v e d

in the c y l i n d e r 126 and is a d a p t e d to f r i c t i o n a l l y e n g a g e c l u t c h p l a t e s 130 and c l u t c h d i s c s 132 f o r the c l u t c h 50 t o

e s t a b l i s h a c o n n e c t i o n b e t w e e n s h a f t s 64 and 82 w h e n e v e r t h e

c y l i n d e r 126 is p r e s s u r i z e d . C l u t c h p l a t e s 130 a re s p l i n e d t o

the s h a f t 64 and c l u t c h d i s c s 132 a r e s p l i n e d to the i n t e r i o r

of the c l u t c h drum 1 2 4 .

F r i c t i o n b r a k e 48 i n c l u d e s b r a k e p l a t e s 134 and b r a k e

d i s c s 136 a re s p l i n e d , r e s p e c t i v e l y , to the drum 124 and t o

the i n t e r i o r of a b r a k e member 138 f o r m e d on the s u p p o r t w a l l

60. Member 138 d e f i n e s an a n n u l a r c y l i n d e r 140. A n n u l a r

p i s t o n 142 is l o c a t e d w i t h i n the c y l i n d e r 140 and e f f e c t s

c l u t c h i n g e n g a g e m e n t of the b r a k e d i s c s and b r a k e p l a t e s f o r

t he b r a k e 48 w h e n e v e r i t is p r e s s u r i z e d .

The h o u s i n g 118 p o r t i o n is b o l t e d a t i t s m a r g i n 1 4 4

to t he r i g h t hand end of the h o u s i n g 28. H o u s i n g 118 i n c l u d e s

an e n l a r g e d p o r t i o n 146 t h a t e n c l o s e s a h y d r a u l i c g o v e r n o r 1 4 8

and f i n a l d r i v e g e a r i n g 14. D r i v e g e a r 54 of the f i n a l d r i v e

g e a r i n g 14 is c o n n e c t e d d i r e c t l y to r i n g g e a r 34. Gear 54 i s

j o u r n a l l e d on s t a t i o n a r y s l e e v e 1 5 0 .

The i d l e r 58 is j o u r n a l l e d by s p a c e d t a p e r e d r o l l e r

b e a r i n g s 152 and 1 5 4 i n b e a r i n g o p e n i n g s f o r m e d in t he h o u s i n g

1 4 6 .

The g o v e r n o r 148 i s d e f i n e d by a h o u s i n g or g o v e r n o r

body 156 j o u r n a l l e d by s p a c e d b e a r i n g 158 and 160 in b e a r i n g

o p e n i n g s f o r m e d in the h o u s i n g 146. A v a l v e o p e n i n g in t h e

g o v e r n o r body 156 r e c e i v e s a m o d u l a t i n g v a l v e e l e m e n t 1 6 2

wh ich n o r m a l l y i s b i a s e d in an i n w a r d d i r e c t i o n by v a l v e

s p r i n g 164 . C e n t r i f u g a l f o r c e a c t i n g on the v a l v e e l e m e n t 1 6 2

o p p o s e s the s p r i n g f o r c e and e s t a b l i s h e s a s p e e d p r e s s u r e s i g n a l t h a t is u s e d by the c o n t r o l c i r c u i t f o r the t r a n s -

m i s s i o n . The c o n t r o l c i r c u i t , in t u r n , e s t a b l i s h e s t h e

s e q u e n t i a l c l u t c h - a n d - b r a k e e n g a g e m e n t and r e l e a s e s d u r i n g

o p e r a t i o n in t h e v a r i o u s d r i v e m o d e s . V a l v e body 156 c a r r i e s

a d r i v e g e a r 164 w h i c h e n g a g e s g e a r 166 c o n n e c t e d to t h e

o u t p u t g e a r 54. By l o c a t i n g the g o v e r n o r and the f i n a l d r i v e

g e a r i n g in t h i s s t r a t e g i c l o c a t i o n and by a r r a n g i n g c l u t c h e s

and b r a k e s in the c o m p a c t f a s h i o n i l l u s t r a t e d in F i g u r e 3A a n d

3B, the o v e r a l l a x i a l l e n g t h of t he t r a n s m i s s i o n a s s e m b l y i s

r e d u c e d . The c o n t r o l c i r c u i t can be l o c a t e d a t the l o c a t i o n

shown a t 168 a t the u p p e r s i d e of the h o u s i n g p o r t i o n 1 1 8 .

The v a l v e body i s c l o s e d by a r e s e r v o i r c o v e r 1 7 0 .

1. In a t r a n s a x l e t r a n s m i s s i o n for a w h e e l e d v e -

h ic le with the engine m o u n t e d t r a n s v e r s e l y to the c e n t e r p l a n e of

the veh i c l e ; a h y d r o k i n e t i c to rque t r a n s m i t t i n g unit (10) having a n

i m p e l l e r (16) c o n n e c t e d to said engine and a t u r b i n e (18) c o n n e c -

ted to a t u rb ine s l eeve shaft (64); mu l t i p l e r a t io g e a r i n g c o m -

p r i s i n g two sun gea r s (30 and 32) of d i f f e r e n t d i a m e t e r , a r i n g

gear (34), a set of shor t p in ions (38) engaging the s m a l l e r s u n

gear (30), a set of long p in ions (36) engag ing the l a r g e r sun g e a r

(32) and said r ing gear (34), said p in ions engag ing each o t h e r

and a c a r r i e r (40) r o t a t a b l y s u p p o r t i n g said p in ions ; said h y d r o -

k i n e t i c unit (10), said engine and said gea r i ng (12) being m o u n t e d

on a c o m m o n axis; c h a r a c t e r i z e d in that said f inal dr ive g e a r i n g

(14) l o c a t e d in a t r a n s v e r s e plane b e t w e e n said h y d r o k i n e t i c u n i t

(10) and said mu l t i p l e r a t io gea r i ng (12); a d r i ven e l e m e n t (56)

of sa id f inal d r ive g e a r i n g (14) being m o u n t e d for r o t a t i on a b o u t

an axis s p a c e d f r o m and p a r a l l e l to said c o m m o n axis; f i r s t a n d

s e c o n d c lu tch means (42 and 50) for c o n n e c t i n g said t u rb ine s h a f t

(64) to said l a r g e r sun gear (32) and said s m a l l e r sun gear (30),

r e s p e c t i v e l y ; th i rd c lutch m e a n s (52) for connec t i ng said i m p e l l e r

(16) to said c a r r i e r (40); and f i r s t and second b r a k e means (46

and 48) a n c h o r i n g said c a r r i e r (40) and said l a r g e r sun gear (32),

r e s p e c t i v e l y .

2. The c o m b i n a t i o n as set for th in C la im 1, c h a r a c -

t e r i z e d in that , said f i r s t and second clutch means (42 and 50) a r e

l o c a t e d b e t w e e n said h y d r o k i n e t i c unit (10) and said mul t ip l e r a t i o

g e a r i n g (12) and said t h i rd c lutch means (52) and said f i r s t b r a k e

m e a n s (46) are loca ted on the side of said mu l t i p l e ra t io g e a r i n g

(12) r e m o t e f rom said h y d r o k i n e t i c unit (10).

3. The c o m b i n a t i o n as set fo r th in C l a i m 1,

c h a r a c t e r i z e d in that, said s e c o n d b r a k e m e a n s (48) and s a i d

f i r s t c lu tch m e a n s (50) a re d i s p o s e d r a d i a l l y o u t w a r d of s a i d

s e c o n d c lu tch m e a n s (42) and said f i r s t b r a k e m e a n s (46) i s

l o c a t e d r a d i a l l y o u t w a r d of sa id th i rd c lu tch m e a n s (52) .