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Патент USA US2406225

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Patented Aug. 20, 1946
Donald W. Kelbel, Muncie, Ind., assigner to Borg- l
' Warner Corporation, Chicago, Ill., a corpora- .
tion of Illinois
. Application August 3, 1944, .Serial No. 547,819
2 Claims.
My vinvention relates to power transmissions,
«and more particularly to transmissions suitable
for use in automotive vehicles.
It is an object of lmy-invention to provide an
improved transmission which is of such con
struction that a suitable number of speed ratios
for driving an automotive vehicle may be ob
tained with a minimum amount of gearing.
It'is another object of my invention to provide
an improved transmission which may be easily
controlled for changing the speed ratio through
the transmission.
It is a further object of my invention to pro
vide an improved transmission having low and
intermediate speed >ratios in which, at the will
of the operator, the driven shaft may either free
wheel with respect to the drive shaft or in which
the two shafts may .be positively connected. It
(01.74-27 0)
and another clutch 20 for connecting the drive
shaft vIl) with the planetary gearing by means
of another intermediate shaft 22. The planetary
gear set I4 comprises a reaction element 24 which
whenl `held stationary functions to complete ’a
power train through the planetary gear set be
tween the shafts I0 and I2 when either of the
A'clutches I6 and 20 is engaged. A positive .type
brake 26 is provided for the reaction element 24,
and aÍblocker 28 allows engagement of the brake,
26 only when the reaction element is rotating in
a 4direction reverse `with respect to the direction
of rotation of the shaft I0.
A holding mecha
nism 30, adapted to be selectively operated, is
provided Vfor holding the brake 26 engaged, and
a -clutch 32 4comprising cam‘med interengaging
teeth `is disposed between the reaction element 24
andanother element of the planetary gearing I4
to lock the elements together and to lock up the
is contemplated that the transmission shall pref
erably provide a direct drive ratio positively con 20 gearing for the purposeswhich will be herein
after described. The reaction element 24 is mov
necting the drive and driven shafts.
ablel longitudinally with respect to the shaft I2
It is still another object ofthe invention to
either by means of a collar 34 on the reaction
_provide such a transmission which may be easily
element or by means of spiral gearing 36 which
controlled so that the driven shaft may drive the
drive shaft at one of the lower speed ratios of 25 is apart of the planetary gear set I4 in order to
the transmission for starting an internal com
either engage the brake 26 >or the clutch 32.
positive typevbrake 38. is provided for the shaft
bustion driving engine connected with the drive
22 and the planetary gearing for providing a re
verse 'drive through the transmissionV as will be
The invention consists of the novel construc
tions, arrangements and devices to be herein 30 hereinafter described.
Referring now in particular to Figs. l and 2
after described and claimed for carrying out the
for amore detailed Ydescription of the trans
above stated objects and such other objects as
mission, vit will be observed that the two-clutches
will appear from the following description of cer
I6 and 20 are positioned closely together and form
tain preferred embodiments illustrated in the
accompanying drawings, wherein:
Fig. 1 is a longitudinal sectional View of a
transmission embodying `the principles of the
35 parts-of a single clutch assembly.
This assem
bly comprises a. fly-wheel 4l) fixed to the shaft `
Ißat'o rotatetherewith and a rear cover plate
42` which is bolted to the fly-wheel 40. A piston
.44 V,comprising annular sheet metal parts 46 and
48 Vand also a piston ring 50, held by a retainer
rig. 1;
.ring '52 with respect to the parts 46 and'48, is
Fig. 3 is a diagrammatic illustration of the
provided within the cover plate 42. The piston
transmission shown in Fig. l;
44 is’disposed between a Ycylindrical portion 54
Fig. 4 is a diagrammatic illustration of another
formed in thecover plate 42 and a sleeve 56 dis
embodiment of the invention; and
Fig. 5 is a diagrammatic illustration of a third 45 posed on.. the shaft 22 and fixed with respect to
thecover plate 42. A_fluid conduit 58 passing
embodiment of the invention.
through _the shafts I8 and 22 and the sleeve 56
Like characters of reference designate like
is provided to Asupply fluid from any .suitable
parts in the several views.
source to the rear of the piston 44, and between
Referring now to Figs. 1 to 3, and in particu
lar to Fig. 3, the transmission illustrated there 50 the piston and the cover plate 42 to force the
'piston forwardly of the clutch assembly. The
in comprises briefly, a drive shaft I0, a driven
piston 44 acts by means of its member .48 on anshaft I2, a planetary gear set I4 connected to
annular sheet metal member 60. disposed about
drive the shaft l2, a centrifugal clutch I6 for
the ~member 46. The member 60 has _a plurality
connecting the drive shaft I0 with the planetary
Fig. 2 is a sectional View taken on line 2-2 of
_gear set by means of an intermediate shaft I8,
»of lug portions 62 each' of which passesth'rough
4 .
a slot 64 provided in the side of the fly-Wheel 4|),`
the arrangement being such that the member
and a sheet` metal retainer member ||2`. The'
member H2 holds the ring ||i| in placewith re
spect to the member |48, and it has a perforated
flange H4 functioning to space the members |08
and 48. The piston |66 is disposed between and
is movable with respect to a cylindrical portion
H6 of the member 46 and the> sleeveñíì. A fluid
69 may move longitudinally with respect to the
clutch assembly. The member 160 bears on the
outer edge of an annular sheet metal member 66
which is provided with lug portions 68 passing
through appropriate slots lû provided in the side
of the iiy-wheel fâowhereby themember 66 may
also move longitudinally of the clutch assem
bly. The member SS is disposed about themem.-Y
ber 4S of the piston 44 and has fixed thereto, by
conduit H8 extending through the sleeve 56 and
the shafts H3 and 22 is provided for Vsupplying
ñuid under pressure from any suitable source to
>the rear of the piston lûö. A pressure plate |20
movable bythe piston iilâ is formed by the mem
means of screws l2, a pressure plate 'i4 formed,`
‘ by sheet metal members ‘i6` and 7S. A plurality
' ber |S8 and an annular member |22J as shown.
of springs Si? are provided in suitable cavities in
‘the side of the fly-wheel 40 'and act 0n the mem
ber 66 for yieldably holding the members 66, 66
and the piston 44 at the‘rearward limit of move
ment of these parts with the member 48 of the
piston bearing against the cover plate 42 as
shown. „ Each> of the slots E4 has a bottom 82
which functions` to limit the movement of the
member SQ toward the front of the _clutch as_
sembly, and each of theslots lil is providedwith
. a bottom 84| whichr functions to limit, the move
ment in the same direction' or the sheet jmetal
l s.
The sleeve 56 has an 'annular member |24 fixed
thereon ’against forward movement, and springs
|26 and |28 are provided between the member
.Idil and the member |24. These springs func-tion to yieldingly oppose movement of the piston
|66 forwardly, and the springs, together with the
springs 613, function also to oppose forward move
ment of the piston 44 and its `associated parts.
The clutch 2S comprises, in addition to the pres
sure plate 'i4 and the pressure Vplate |20, adriven
Vclutch disc i3d. The disc |3||`has a hub |32 that
is splined to the shaft 22 Yso as to be non-rotat
member 63. The parts of the clutch assembly so
able with respect to the shaft butthe >hub may
far described function so that, when iiuid under
have longitudinal movement on the shaft. The
pressure is admitted behind'the piston 44, the
clutch 26 is engaged by applying fluid _under 'pres- '
piston, the parts 60 and E5 and the pressure
sure behind the Ypiston |06 through the lconduit
plate 74 are moved forward until the lugs |52
H8 to move the pistonand thereby theA pressure
plate |_2il forwardly `whereby theclisc |30A igen
Contact the bottoms 82 of the slots $4,
The clutch l5, after ñuid under pressure has
gaged between the pressure plates Y'|20 and 74, and
been applied to the piston 44 to move the lug
this engagement may take place either with the
portions E2 ofthe member 6|] linto Contact with
clutch v|¿6 engaged or disengaged.
. , i '
the bottoms 'S2 of the Vslots 64, is conditioned t‘o 35
It will >be observed that the Vshaft 22 i‘s‘jour
be engaged according to the speed of the shaft
naled Within the housing |34 of the transmission
ii). VCentrifugal weights 86 perform this func
and the shaft lâ is jouinaled within the shaft 22.
tion ,ofY centrifugally engaging the clutch. The
The shaft iâris piloted Ywith'respect to the shaft
Y member Se is provided with outwardly extend
|€| by means of a bearing |36, and the Vshaft >It '
4ing wing or lug portions 88 and each of these por- ' 40 is also piloted in the driven shaft I2, as shown.
tions is provided with a notch 99 in which is re
ceived an acute portion 92 o_f a weight 86, ythe
arrangement being -such that the notch 'Sû‘acts
as a fulcrum for the) weight, allowing the weight
to move outwardly under the influence of centri
fugal force due to rotation of the shaft I0, the
`fly-wheel 4e, the member Bü and thereby the
weights 8S.' Each of the weights is connected
by means of a strut 94 with the pressure plate
The shaft Yi8 has a sun ,gear |38 formed thereon,
andthe shaft r22 is provided‘with a ringjgear |40,
both of the gears ’|88 and |41), `_forming p-@Iîts'of
`the planet gear set i4.Y rí‘he gear set i4 ,comprises`
ç also planety gears |42 wliich'are in meshjwiththe
sun gear |35 and planet gears- |44 which are in
mesh with the planet gears |42 and with the ring
gear Mt. A spiral planet gear |43 is integrally.
connected with each of the gears |44, andthe
la, so that as the weight V85 moves outwardly, 50 spiral gears are in mesh with a spiral sun gear
the weight tends to separate the members 60 and
|48 formed on the reaction element 24. The
iìß?andmove the pressure plate 'i4 toward the
gears |455 and |46 together fQlîmthespiral'gear
ily-'wheel 4t. A washer type spring-‘95 is disposed
ing Bß'hereinbefore referred to, and the reaction
between the member 66' and a flange 9B on the
element 24 is Vrotatably and longitudinallymov
end of the member 465, and the spring'95 is thus 55 ably disposed on the driven shaft i2. The planet,
so disposed as to yieldingly oppose such forward
gears |42, |44 and it@ are rotatably disposed on
movement of the pressure plate 'I4 dueto outward
a carrier |5@ which is connected with‘theshaft
`movement of. the weights 85, and as will be ap
i2. >The ring gear |46 is provided with'teeth |52
parent, such movement of the pressure plate 14
on its outer periphery, and a pawl |54 carried by
>is also similarly opposed by the springs 80. Y The 60 the transmission casing |34 is provided for en
clutch itV comprises, in addition to theV fly-wheel
gaging with the teeth M2. Y _The,pawljl54 and the
Y¿it and the pressure plate 14, the driven plate
teeth |52 together form the positive brakeBS for
|66 which is connected by means of a vibration
the ring gear |43 and the sliaftZZ.v
absorbing unit |62 of any suitable construction
withV a hub HB4 which is'splined to the shaft I8.
.The Planetary gear set issuch thatrwhen the
reaction element 24, along with its' sun gear |48,
is held stationary and the shaft ’LS and its sun
gear |38 are driven through the clutch'JiS, the
l ,
The Weights 85 function, afterv fluid under pres
surehas been appliedto the piston 44> to move'the
piston and the associated parts so that the mem
carrier |56 and the driven shaft l2 connected
ber E3 contacts' the bottoms 82 ofthe slots B4
therewith are driven at a low ratio forward drive.
lforconditioning the clutch l5, for engagement, 70 When the ring gear |45 is driven'through the
tofmove the pressureplate 14 the additional dis
clutch‘îû, ‘and -the reaction element 24> is held
stationary, with the clutch la beingY disengaged,
tance needed to engage the clutchrlß.
„ ,
. A pistoni |36 is provided for engaging> the clutch
thev oarrierji` 5|! and the shaft|2 are driven atan
2t, `'Ik'hispiston comprises a memberl lilâof` Vsheet
intermediatespeed forward drive.) ,Whenbo'thof ,
metaL' a piston ring [l0 of va yielding'material, 75 the clutches ’l ß and 2G are :engaged and the reac-KK
vplanet gearing I4 is locked up and the 4carrier |50
elements |64 4which are slidablydisposed in suit.
-ab1e;cavities in the casing |34:- and are'adapted‘to
tionv element 24 is' allowedto rotate freely,~the
and the driven shaft I2 are driven at a one to `one
_:fitïin a groove vI 60 in the reaction element 24 .when ,
ratio with respect tothe intermediate shafts I8
and 22 and the drive shaft I0. When the brake
33 is engaged to hold the ring gear |40 stationary
the teeth |58 are interengag'ekîlU with the> teeth
the4> elements V|64 and isprovided with cams |10
and the clutch It is engaged and the reaction ele
ment 24 is released to rotate freely, the carrier
|50 and the shaft I2 are driven at a low speed in
on its inner surface for acting on the elements
|64. The member |68 is adapted to be operated i
manually or by any suitable means, and when
reverse- drive.
The reaction element `2d: in its'movement may
be controlled by a collar 34, a toothed clutch 32,
a positive type brake 26, a blocker Y28 and a> re
taining mechanism 3@ for holding the element
|503. >A''sleeveflike'memberfl|58. is disposed’ about
10 the reaction element 24 is moved rearwardly from
its position as shown in Fig. 1 to engage the
teeth |58 with the teeth |55, rot-ation of the mem
ber |20 will cause the cams |10 to lock the bean
elements |64 in the groove |06 and thus prevent
15 any forward movement of the reaction element
from longitudinal movement, all hereinbefore re
24. When the transmission is either in low or i
ferred to. The collar 34 is splined on the element
24 and is fixed against longitudinal movement on
intermediate speed,.with either of the clutches I0
and 20 engaged, the spiral gearing 36 acting on
the element by suitable retainer rings, as shown.
The brake 20 comprises stationary teeth |56 car
the reaction element 24 tends to cause the latter
ried by the transmission casing 134 'and brake 20 element .to be moved _forwardly'of the transmis
sion to disengage the positive brake 20 when` the
teeth |58 formed on the reaction element 24 and
shaft i2 is allowed to drive, as when the power on
adapted to mesh with the teeth |55. The blocker
mechanism 23 comprises a blocker element |550
the shaft Iiì is decreased, and the'spiral gearing
which is disposed on and may have limited os»
3% together with the reaction element 24 and the
cillatory movement with respect to the element 24 25 brake 26 thus act as a free-wheel brake on lthe
reaction element 24when> the mechanism 30 is
disengaged. When the mechanism 30 is engaged,
a stationary part |62, fixed with respect to the
transmission casing I3Ll,.by means of a spring
with the'transmission being conditioned either
and which is held in friotional engagement with
|63 between the collar 34 and the blo-cker element
for low or intermediate forward drive, the bean
|50. The blocker mechanism maybe of any suit, 30 ele-ments |64 lprevent forward movement of the
reaction element 24 and thus function to prevent
lable construction and is such as to prevent rear
this free-wheeling action of the reaction element
ward movement of the element 24 and block en
24, and the shafts |0 and I2 are .positively con
gagement of the teeth |58 with the teeth |55 when
nected through the gear set I4 in both speed
the element is rotating' in a forward direction,
that is, in the same direction as the drive shaft
When the brake 35i-is engaged to condition the
» |0, and the blocker mechanism allows such move
ment of the element 24 and engagement of the
gear set I4. for reverse drive, the reaction on the
yteeth |53 with the teeth |55 when the rotation
' element 24 is in a reverse direction which tends
to move the element 24 rearwardly of the trans
of the element 24 is in the opposite direction.
The brake 26 is engaged automatically to hold the
mission to engage the brake 25. In this case, the
reaction element 24 stationary when either of the
collar 34 is utilized to hold the reaction element\
against such rearward movement for preventing \
clutches |B and 20 is engaged to provide a reduced
speed ratio through the transmission. The spiral
engagement of the brake 25.
The clutch 32 comprises clutch teeth |12 on
gearing 35 functions to move the reaction element
24 longitudinally of the shaft I2 either in one di 45 the carrier |50 and clutch teeth v|14 on the collar
rection or in the other depending on the direc
34. The collar is splined to theV reaction element
tion ofl reaction on the element 24 by the gearing.
22, and the teeth |14 are thus ñxedwith respect
to the reaction element. The teeth |12 and |15
If the reaction on the element 24 is in the reverse
direction, the spiral gearing urges the element
are slanted or beveled, as shown, and the clutch
longitudinally rearwardly of the transmission
32 may thus engage when the reaction element
tending to engage the teeth |58 with the teeth
24 rotates in a forward direction with respectto
|56, while if the reaction on the element 24 is in
the carrier |50 but cannot engage if >the relative
direction of -rotation of the element 24 is in the
the opposite or forward direction, the element 24 l
is urged longitudinally forwardly of the transmis
opposite direction. The clutch 32 is utilized for
sion. Such action by the spiral gearing is pro
-Inoted by the frictional retardation of rotation of
the element 24 >by thel blocker element |60 fric~tionallyA engaging with the stationary part |52.
When either of the clutches `I 6 and 20 is engaged,
locking up the planetary gear set|4 when it is
desired to provide a connection between the shaft
I2 and- the shaftV I0, with only the clutch 20 being
engaged, as for starting an `internal combustion
engine (not shown) connected with the shaft I0 f
the reaction on the element 24 is in the reverse 60 by rotating the shaft I2. The clutch I6, in case
direction and the spiral gearing urges the element
the shaft I0 is not in rotation, cannot be engaged,
24 rearwardly of the transmission. On such ro
as will be readily understood, sincethis clutch is
tation and longitudinal movement of the element
of the f» centrifugal typeactuated by rotation‘of
24, the blocker mechanism 28 allows engagement
the shaft I0. When the clutch 20 is' engaged and
"of the teeth |58 with the teeth IE5, and the ele
the shaft I2 is rotated in the forward direction,
ment 24 is thereby braked to complete a low speed
the reaction on the reaction element 24 is in` a
ratio drive through the transmission. When both
forward direction and the spiral gearing 36 func
of the clutches I6 and 20 are engaged to provide
tions'to move the'element 24 forwardly of the
a direct drive through the transmission,-the re
transmission. Such movement of the- reaction
action on the element 24 is in the forward direc 70 element 24 causes engagement of the clutch 32
tion and the tendency of the spiral gearing 35 is
to lock up'the gear set I4 andxcomplete the con
to pull the element 24 forwardly of the transn
mission. The brake 26 is thereby disengaged, and
the element 24' may thereafter rotate freely.
nection from the shaft |2 to the shaft | 0. When
the engine connected with the shaft I0 is started
and begins `to drive, then the carrier I 50` tends- to
The locking mechanism30 comprises bean-‘like 75 .rotate faster in arforward direction than the
Y 2,406,225
7 Y
teeth |89 eng-ageablewith.stationary teeth, |82.V
reactioneiement >24 and the reactionbnitne eie-`
ment 24 is .in the reverse direction, .andtheele
The brake Yfor the shaft 22- may be engaged sim
ment’24 'is moved rearwardly ofthe transmission
-ply by moving .the sleeve |18 to ,engage theteeth
andthe clutch 32`is disengaged.
|80 with the teeth |82. This embodiment of the
.'.In' brief, the operation of the transmission illuvs~
trated in'Figs.'is as followsz‘ Whenit lis
desired to .provide forward drive at low ratio
through the transmission, the clutch I5 is con»-r
-invention operates similarly to the embodiment
first .described with the exception that the brake
for the reaction element 24 is engaged and dis
-engaged manually.
Referring to Fig. 5 of thedrawings, the em
bodiment‘of the invention shown in this figure
isquite similar to< that shown in Figs. 1 to 3
diiîering only from> the latter embodiment inV
ditioned for. operation `by applying fluid under
pressure behind thepiston 44 to move the piston
and the associated> parts including the'member
‘55 to bring the lugs 62 of the latter member, -into
having a different'brake structure for the reac
tion element 24. The brake structure for the
reaction element 24 in this embodiment'comprises
' engagement with the bottoms 82 of the slots .64.
The clutch I6 is then conditioned for engagement,
and `upon,increasing the speed >of the shaft I0, the
weights 85 will move outwardly and will 'move
the pressure plate 'i4 to engage the clutch disc It@
between the fly-wheel 4.3 and the clutch plate 14.
Va one-way roller brake unit |64 which is con-Y
nected in series with and is made effective by a
positive type brakecomprising teeth |36 yand a’
rotationally fixed pawl '|88 adapted »to engage
.The 'clutch IB, on being soengaged willdrive the
shaft I8 and the'planetary gearset I ¿Land the
with the teeth.
A friction brakeV |90 is provided .
for the reaction element 24 and is disposed in
. spiral gearing 35 will cause> a reaction on the
reaction element> 24 inîthe reverse direction and l.
y will move r-itrearwardly of the transmission. .Such
parallel with the one-way brake structure. This
embodiment operates quite similarly tolthe em
movementof the reaction element 24 rwill dis
bodiment shown in Figs. l to 3 with the one-way
engage the blccker‘rnechanism 28 and will en- -n
brake unit |34 operatingsimilarly to the spiral
gearing 36 and the positive'brake 26 acting on
the reaction element 24. The friction brake £98
functions quite similarly to the locking mecha
nism 3i) in the first embodiment of the invention
and may be Vapplied to provide _a positivedrive
in either low or intermediate speed bctween'the
gage .the brake 2% to complete the low speed
power train through the transmission. ToV shift
the transmission to ‘intermediate speed, the clutch
` lâ is disengaged by draining the fluid from behind
- the piston e4, and the clutch 2i! is engaged by ap-n
plying' duid under‘pressure ‘to the .piston IE6 and
between the piston parts |98 and 4E. Clutch 2d
will then drive the planet gear set |4 through the
shaft 22. The brake'Zß will remain engaged, and
the intermediate speed `power train through the
transmission will. be completed. It will be un
drive and driven shafts.
I wish it to be understood that my invention
is not to be limited tothe specific constructions
and arrangements shown .and described except
only insofar as the claims may be so limited, as
it will> be apparent to those >skilled in the art
derstood that 'both of these power trains are of
that changes may be >made without departing
the free wheeling' type due to the free wheeling'
from the principles of the invention. ..
action of the reaction element 24; however, both
of the drives may be made positive by engaging 40
l. In a transmissionthe combination of a drive
the mechanism 39,. as has been hereinbefore de
shaft, a driven shaft, a planetary .gear'set con
scribed. To shift the transmission to direct drive,
nected to drive said driven shaft and including a
the clutch It is again engaged, with the clutch
sun gear, a ring gearl a first planet gear in .mesh
29 remaining `engaged, by applying duid under
with said sun gear, a second planet .geargin mesh
pressurebehind the piston 44. The planet gear
with said first planet gearfand with Vsaid ring
set I4 will be locked upand there will be a direct
gear„ a third'planet gear integrally connected
,K drive between the shafts I0> and I2. The brake
withfone of said first two named planet gears, and.
2_5 for the element 24 will be disengaged due to
a sun `gear constituting a reaction gear vand in '
theïaction of the spiral gearing St, as has been
IV claim:
Vher’einbefore described.
' is held against rearward longitudinal movement
by useof the collar 34, and the clutch .l5 is en
gaged yto complete the low speed reverse drive.
For causing rotation of the shaft _i@ by rotating
the shaft I2 as for starting a driving enginethe
second speed clutch 2E! is engaged, and the action
of the spiral gearing 36 will engage the clutch 312
' to lock up the planetary .gear set and complete a
drive from the driven shaft I2 to the drive shaft
mesh with saidr third planet gear, a clutch for
connecting said drive shaft with said first Anamed
sun gear to provide a power train between said
vshafts at a certain speed'ratio, ’a clutch for con
necting said drive shaft with said ring gear >to Y.
provide a power train between said shafts at an
other speed ratio, and means for braking said
reaction gear to provide a reaction point for Vthe j
gear set to complete both of said power trains,
saidv braking vmeans comprising a one-Way roller
(SO brake the inner race of which is formed on a
hub of said `reaction sun gear and the outer race
For reverse drive, the -
brake 38 is. engaged, and the reaction element 2:?
Referring to Fig. 4 of the drawings, themodi
ñcation therein shown differs from-the construc~
tion shown in Figs. 1 to 3 in providing a simpler
positive type brake forthe reaction elementëß
and in providing a somewhat different type of
. positive brake for the ring gear |40 of the planet
gear setV I4. The brake for the reaction element
24 in this embodiment 4of the invention comprises
of which has external teeth, anon-rotatable pawl
adapted to engage the teeth of said outer roller
race to prevent rotation thereof and to thereby
render the one-way brake effective, a brake drum
connected to the hub of said reaction .sun gear,
and selectively operable friction means for stop
ping the rotation of said drum and for thereby
braking the reaction sun gear in both ydirections
simply brake teeth `I'l41fixed with .respect to the .70 of rotation.
reaction element and a pawl |16 which is adapted
2. In a transmission, the combinationV of a
to engage -with the -teeth '|14' to hold the 'teeth
drive shaft, a driven shaft, asplanetary gear set .
and the reaction elementV stationary. 'The brake
connected to >drive said driven shaft and includ
rfor the ring gear |4|I 'for use in reverse comprises
ing asun gear, a ring gear, a first planet gear
y a'sleeve I'I8`splined‘to :theshaft 22 and having
. in mesh with saidv sun gear, Va :second «planet gear .
in mesh with said first planet gear and with said
ring gear, a third planet gear integrally connect
ed With one of said ñrst two named planet gears,
and a sun gear constituting a reaction gear and
ratio, land means for braking said reaction gear,
to provide a reaction point for the gear set to
complete both of said power trains, said braking
means comprising a one-way roller brake the
in ~mesh with said third planet gear, clutch 5 inner race of which is `formed on a hub of said
means for connecting said drive shaft with said
reaction sun gear and the outer race of which
iirst named sun gear to provide a power train be
has external teeth, a non-rotatable pawl adapted
tween said shafts at a reduced speed ratio, the
to engage the teeth of said outer roller race to
initial movement of said clutch means toward
prevent rotation thereof and thereby render the
clutching engagement being hydraulically insti
gated and the ñnal movement into clutching en
gagement being responsive to a predetermined
speed of rotation of the drive shaft, hydraulically
operated clutch means for connecting said drive
shaft with said ring gear to provide a power train
between said shafts at an intermediate speed
10 one-way brake effective,a brake drum connect
ed with the hub of said reaction sun gear, and
selectively operable friction means for stopping
the rotation of said drum and for thereby brak
ing the reaction sun gear in both directions of
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