close

Вход

Забыли?

вход по аккаунту

?

Патент USA US3041901

код для вставки
July 3, 1962
R. L. BLACK ETAL
3,041,891
TRANSMISSION
Filed NOV. 7. 1957
Arm/P1152)’
United States Patent O?lice
3,641,891
Patented July 3, 1962.
directly behind the vehicle engine 15 and is as close
3,€la1,§9l
TRANQVHSMUN
ltohert L. Black, Allen Park, and f‘aheldon E. Thoreau,
Ann Arbor, Mich” assignors to General Motors Qorpo
ration, Detroit, Mich“ a corporation of Delaware
Filed Nov. 7, 1957, Ser. No. 6%,980
thereto as possible so as to consume a minimum amount
of space in this vicinity. The unit 10 includes a hydro
dynamic torque transmitting device, e.g., a ?uid cou
pling l6, and a planetary gear set, denoted generally at
13, for transferring drive between an engine connected
power shaft 20 and a load shaft 24, the rear end of
15 Claims. (Cl. 7él-—677)
the latter shaft being joined through a universal type
This invention relates to improvements in automatic
transmissions arranged for installation, although not ex
clusively, in motor vehicles.
With lower motor vehicle bodies, the body floor board
connection 26 to the front end of the line shaft 14.
The
?uid coupling 16 is of conventional construction utilizing
a pump 28 connected to the power shaft 20 to transfer
torque through a ?uid medium from a suitable source
to a turbine 34}, in turn, connected to a ring gear 32.
must be altered to accommodate the drive train between
the engine and the rear axle if a minimum road clear
A planet carrier 34 for the gear set is connected to the
ance is to be maintained. As a result, a very pronounced 15 load shaft 24- and has journaled thereon a series of
bump is formed in the ?oor board which interferes with
planet pinions 36 which intermesh with ring gear 32 and
passenger comfort.
With this in mind, the invention proposes a variable
a reaction sun gear 38.
Two drive ratios are obtainable through the front
speed drive ‘for a motor vehicle comprising separate
drive connected units, one closely adjacent to the engine
and another immediately next to the axle gearing, thereby
unit ltl, one an under drive and the other a direct drive.
For the under drive ratio, a one—way mechanism 40 is
utilized to prevent reverse rotation of the reaction sun
reducing the bump in the floor board extending along
gear 35. The one-way mechanism 40 may be of known
the longitudinal axis of the vehicle. Each unit includes
structure employing one-way elements, such as sprags,
change speed gearing and drive ratio changing devices to
rollers, or the like, to prevent relative rotation in one
furnish a multi-step ratio drive.
25 direction between two members and to allow ‘free rela
tive rotation in an opposite direction. With the sun gear
In dividing a drive of the foregoing character into
38 held and the ring gear 32 being driven forwards, the
units, it is desirable that the same number of ratios be
obtainable as when the units are together in one hous
carrier 34 will, likewise, rotate forwards, but at a reduced
ing.
This should be accomplished with as few addi
speed.
When the direct drive ratio through the unit 10
tional parts as possible so as to not increase the cost. 30 is Wanted, a multiple disk type direct drive clutch 42 inter
posed between the ring and sun gears 32 and 28 is en
Therefore, the invention seeks to provide a multi-step
. gaged whereupon the gear set 18 will rotate as a unit
ratio transmission which automatically changes from one
with planet carrier 34 being driven at the same speed as
ratio to another smoothly and in a relatively imperceptible
the ‘driving ring gear 32.
manner and which has the operating components uni
The coupling 16 is used, when the engine is operating,
quely arranged so as to permit division of the drive with 35
to commence vehicle movement and is so designed that
a minimum of parts.
By the invention, a hydrodynamic torque transmitting
the torque transmitted thereby at idling speeds of the
engine will be insu?icient to move the vehicle. Conse
quently, starts are automatic and the driver does not
shifts through change speed gearing are produced by
combining another hydrodynamic torque transmitting de 40 have to release and engage a pedal operated clutch.
However, as is well known in the art, ?uid losses occur
vice, which is ?lled and emptied, with one-way mecha
device is utilized ‘for starting the vehicle while smooth
in the coupling due to the inherent slippage.
nism.
Therefore,
at an appropriate vehicle speed, the impeller 28 and
turbine 39 are clutched together by a lock-up clutch 44.
train is divided into front and rear units. The front
unit is positioned immediately adjacent to the engine and 45 In this way a mechanical drive is provided between the
engine 15 and the gear set 18 with the ?uid losses elimi
includes gearing and a hydrodynamic torque transmitting
nated, hence increasing the e?iciency of the drive.
device which is subsequently locked up after the vehicle
The rear unit 12 is, as depicted in FIGURE 2, disposed
attains some predetermined speed while the rear unit is
in front of conventional bevel type rear axle gearing 45
mounted next to the axle gearing and also includes gear
ing. The two units are drive connected by a power 50 and is as close thereto as possible. The unit 12 has two
planetary gear sets 46 and 48 furnishing, respectively, for
transfer member and together they provide four forward
In carrying out the invention, a variable speed drive
speed ratios and a reverse drive. Those shifts, which are
more likely to be noticeable by the operator, are con
ward and reverse drive between a driving shaft 52 con
nected at the front end through a universal joint 54 to
trolled by a hydrodynamic torque transmitting device
the rear end of the line shaft ‘14- and a driven shaft 56.
and one-way mechanism so that, when the device is ?lled 55 The driven shaft 56 drives the axle gearing 45 through an
and emptied of ?uid to initiate a shift, any shocks are
attached pinion gear 60 and a mating ring gear 62. The
absorbed by the ?uid.
The ‘foregoing and other objects and advantages of
the invention will be apparent from the following descrip
tion and from the accompanying drawings in which:
’
FIGURE 1 illustrates schematically a variable speed
forward driving gear set 46 comprises a sun gear 64
driven by the driving shaft 52, a reaction ring gear 66, and
a planet carrier 68 on which are journaled a. series of
60 planet pinions 70 intermeshing with the gears 64 and 66.
The reverse gear set 48 has a sun gear 72 connected to the
drive train demonstrating the principles of the invention.
ring gear 66 of gear set 46 and a reaction ring gear 74,
FIGURE 2 is a view of the drive train installed in a
motor vehicle.
both intermeshing with a series of planet pinions 76 jour
naled on an output planetary carrier 78.
Both of the
Referring to the drawings, particularly FIGURE 2, 65 carriers 63 and 73 are drive connected to the driven
the numerals 1% and 12 designate, respectively, front
engine connected and rear axle connected transmission
shaft 56.
The gear set 4-6 is arranged to furnish both an under
units which are drive connected by a torque transfer
drive and ‘a substantially direct drive ratio therethrough,
member, such as line shaft 14. The length of the line
as will be apparent. To cause the planet carrier 68 to be
shaft 14 can be varied to permit installations in differ 70 rotated forwardly at a reduced speed relative to the driv
ent size vehicles.
ing shaft 52, the reaction ring gear 66 is prevented from
As shown in FIGURE 1, the front unit it) is mounted
rotating backwards. This is accomplished by a one-way
3,041,891
r.
v
4.!
{i
bers of the coupling 16 attain nearly the same speed,
they can be clutched together by the clutch 44 Without
mechanism 80, similar to the front unit one-way mecha
nism 40, comprising an outer race 82 grounded or main
tained stationary by a neutral disk type brake 34. By the
creating any noticeable sensation to the driver.
brake 84 and the one-way mechanism 83, the reaction
In reverse drive, lock-up clutch 44, direct drive clutch
ring gear 66 is prevented from reverse rotation, but may Or 4-5-2, and neutral brake 84 are each disengaged and the
rotate freely forwards. For direct drive, another hydro
rear unit coupling 86 is emptied. Reverse brake 92 is
dynamic torque transmitting device, for instance, ?uid
engaged and as explained before, the output reverse car
coupling 86, is employed, having a pump member 88 at
rier 78 will be driven at a reduced speed in a reverse
tached to the driving shaft 52 and a turbine member 96
direction. It should be noted here that the front unit
secured to the reaction ring gear 66. During under drive 10 planetary gear set 18 is conditioned for reduced drive
the coupling 86 is void of ?uid, but when a shift is
and, therefore, the input sun gear 54- wi-ll be driven at a
wanted the coupling is ?lled from an appropriate source
reduced speed so that the gear set 18 does contribute and will cause the one-way mechanism 86} to release
to the overall reverse ratio.
gradually, the coupling ?uid absorbing any shock tenden
Preferably, since the couplings l6 and 86 require ?uid,
cies, and ultimately the sun and ring gear 643 and 66 will
be rotated at nearly the same speed. There will be a
slight difference in speeds in the gears 64 and 66 due to
the brakes‘and clutches for each unit ‘10 and 12 are
hydraulically actuated. Furthermore, since the num
ber of such brakes and clutches is kept to a minimum,
the inherent slippape in the coupling 86. However, for
each unit may have an individual pressure source with
all practical purposes, the output carrier 68 can be con
sidered driven at the speed of the driving shaft 52.
out any necessity for intercommunication through long
20 conduits.
Reverse drive through the transmission is possible by
From the foregoing and as depicted in FIGURE 2, it
engaging a cone type reverse brake 92 which restrains
the reverse ring gear 74 from rotation in either direction.
Since the vehicle will be nearly stationary before reverse
mission units with a minimum of conveniently arranged
components, the space required for the drive train along
is attempted, the driven shaft 36 and, accordingly the
planet carriers 68 and 78 will be stationary. Forward
essity for any large bump in the ?oor board is removed.
rotation of the sun gear 64 of gear set 46 will, with the
carrier 68 stationary, rotate the reaction ring gear 66
Because the front unit is positioned very close to the en
gine and the rear unit is as close as is convenient to the
backwards since, in reverse drive, backward rotation of
axle gearing, the intermediate ?oor board area above
the line shaft would have to be only slightly altered, if
at all.
can be seen that by dividing the drive into two trans
the longitudinal axis of the vehicle is less so that the nec
the ring gear 66 is permitted, the neutral brake 84 being
disengaged and the one-Way mechanism 80, therefore, in
effective. With the ring gear 66 connected to the input
sun gear 72, the drive therefrom will cause the planet
carrier 78 to be driven at a reduced speed, also in a re
verse direction.
The operation of the transmission is as follows:
The invention is to be limited only by the following
claims.
We claim:
35
1. In a variable speed drive train for transferring drive
between a vehicle engine and wheel driven axle gearing,
To condition the transmission for neutral, lock-up
the combination of a front transmission unit positioned
clutch 44, direct drive clutch 42, and neutral brake 84%
immediately adjacent the engine and driven thereby, the
are all disengaged and ?uid coupling 66 is emptied. There
front unit comprising a hydrodynamic torque transmitting
is no restraining force with the neutral brake 84 disen 40 ‘device, means locking up the hydrodynamic torque trans
gaged, preventing reverse rotation of the reaction ring
mitting device, and change speed gearing for providing a
gear 66 and, as a result, drive from the front unit 16,
plurality of drive ratios therethrough, a rear transmission
which is possible since the front unit gear set is condi
unit disposed in close proximity to the axle gearing for
tioned for reduced drive with the one-way mechanism Alt»
transmitting drive thereto, the rear unit including a hy
effective, cannot be transferred to the driven shaft 56 by 45 drodynamic torque transmitting device and change speed
the gear set 46. As can be seen, the neutral brake 843,
gearing for furnishing a plurality of drive ratios there
when disengaged, furnishes a positive neutral for the
rthrough, and a torque transfer member drive connecting
drive train.
the front and ‘rear units, the front and rear transmission
units being so correlated as to ‘deliver drive to the axle
Forward drive in ?rst speed is initiated by engaging the
neutral brake 64. Then, drive is through the ?uid cou
gearing in a plurality of automatically attainable ?nal
pling 16 and both the front unit gear set 18 and the rear
unit gear set 46 at reduced speeds to the driven shaft 56.
For second speed, the front unit direct drive clutch 42
is engaged so that the front unit gear set 18 is locked up
drive ratios representing a combination of the drive ratios
from each transmission unit.
2. In a variable speed drive train for transferring drive
between a vehicle engine and wheel driven axle gearing;
the combination of a front transmission unit positioned
for direct drive; Thus, the ratio in second speed is de
termined solely by the reduced drive afforded by the rear
immediately adjacent the engine comprising a hydrody
namic torque transmitting device having an impeller
unit gear set 46.
In third speed, the status of both the front and rear
driven by the engine, and a turbine, a planetary gear set
units 10 and 12 is changed. The front unit direct drive
including an input element connected to the turbine, an
clutch 42 is disengaged whereupon the one-way mecha 60 output element and a reaction element, means for pre
nism 40 becomes effective and the front unit gear set 18
venting rotation of the reaction element in one direction
is set for under drive.
The rear unit planetary gear set
to aiford one drive ratio through the gear set, and means
for clutching together two elements of the gear set to
provide another drive ratio therethrough; a rear trans
46 is conditioned for direct drive by ?lling ?uid coupling
86. The ratio now is determined by the front unit plane
tary gear set 18.
mission unit disposed in close proximity to the axle gear
ing and including a planetary gear set having an input
element, an output element driving the axle gearing and
a reaction element, means for preventing rotation of the
'
Fourth speed is established by engaging the front unit
direct drive clutch 4-2. Hence, the ratio becomes a di
rect one, except for the previously mentioned slippage.
'In forward drive, the lock-up clutch 44 may be en
reaction element in one direction to afford one drive
gaged at any time after the vehicle has started to move.
Preferably, engagement is effected as soon as possible
to eliminate the ?uid losses, but not at a time that could
create a noticeable jar. ‘In other words, the ?uid cou
ratio through the gear set, and means for clutching to
gether two elements of the gear set to provide another
drive ratio therethrough; and a torque transfer member
for drive connecting the output element of the front unit
pling 16 should be kept in operation long enough for
a smooth and gradual start and, then, when the mem
gear set and the input element of the rear unit gear set.
75
3. In a variable speed drive train for transferring drive
8,041,891
5
6
between a vehicle engine and wheel driven axle gearing;
the combination of a front transmission unit positioned
6. In a variable speed drive train for transferring drive
between a vehicle engine and wheel driven axle gearing;
the combination of a front transmission unit positioned im
immediately adjacent the engine comprising a hydrody
namic torque transmitting device having an impeller
driven by the engine, and a turbine, a planetary gear set
including an input element connected to the turbine, an
output element and ‘a reaction element, means for pre
venting rotation of the reaction element in one direction
to afford one drive ratio through the gear set, and means
mediately adjacent the engine comprising a hydrodynamic
torque transmitting device having an impeller driven by
the engine, and a turbine, a front unit planetary gear set
including an input element connected to the turbine, an
output element, and a reaction element, one-way mecha
nism for preventing rotation of the reaction element in
for clutching together two elements of the gear set to 10 one direction to afford one drive ratio through the gear
set, and a clutch for clutching together two elements of
provide another drive ratio therethrough; a rear trans
the gear set to provide another drive ratio therethrough;
mission unit disposed in close proximity to the axle gear
a rear transmission unit disposed in close proximity to the
ing and including a planetary gear set having an input
axle gearing and including a rear unit planetary gear set
element, an output element driving the axle gearing and
a reaction element, another hydrodynamic torque trans 15 having an input element, an output element driving the
axle gearing and a reaction element, a ?uid coupling for
mitting device for connecting, when ?lled with ?uid, two
connecting, when ?lled with ?uid, two elements of the
elements of the gear set to provide one drive ratio there
gear set to provide one drive ratio therethrough, means in
through, and means vfor preventing rotation of the reac
cluding a ‘brake engageable for preventing rotation of the
tion element in one direction, when said another device is
reaction element in one direction, when said another de
empty so as to provide another drive ratio therethrough;
vice is empty, to a?ord one drive ratio through the gear
and a torque transfer member drive connecting the out
set and disengageable for establishing neutral for the drive
put element of the front unit gear set and the input ele
train, a reverse planetary gear set having an input element
ment of the rear unit gear set.
connected to rear unit reaction element, an output element
4. In a variable speed drive train for transferring drive
between a vehicle engine and wheel driving axle gearing; 25 connected to the rear unit output element and a reaction
element, and a reverse brake for holding the reverse ele
the combination of a ‘front transmission unit positioned
ment to drive the reverse gear set output element back
immediately adjacent the engine comprising a hydrody
wards and furnish a reverse drive for the train; and a
namic torque transmitting device having an impeller driven
torque transfer member drive connecting the output ele
by the engine, and a turbine, means for connecting the
impeller and turbine together to lock up the device, a 30 ment of the front unit gear set and the input element of
the rear unit gear set.
planetary gear set including an input element connected
7. In a variable speed dlive train for transferring drive
to the turbine, an output element, and a reaction element,
between a vehicle engine and wheel driven axle gearing; the
means for preventing rotation of the reaction element in
combination of a transmission unit positioned immediate
one direction to afford one drive ratio through the gear
set, and means for clutching together two elements of 35 ly adjacent the engine and comprising a hydrodynamic
torque transmitting device having an impeller driven by
the gear set to provide another drive ratio therethrough;
the engine, and a turbine, a lock-up clutch engageable for
a rear transmission unit disposed in close proximity to the
connecting the impeller and turbine; a planetary gear
axle gearing and including a planetary gear set having
set including an input gear connected to the turbine, a
an input element, an output element driving the axle
gearing and a reaction element, another hydrodynamic 40 reaction gear and an output planet carrier having jour
naled thereon a planet pinion intermeshing with the input
torque transmitting device for connecting, when ?lled
and reaction gears, a one~way mechanism for prevent
with ?uid, two elements of the gear set to provide one
ing rotation of the reaction gear in one direction to pro
drive ratio therethrough, and means for preventing rota
vide one drive ratio through the front unit gear set, and
tion of the reaction element in one direction, when said
another device is empty, to alford another drive ratio 4:5 a clutch for connecting the reaction input gears together
to provide another drive ratio therethrough; a rear trans
through the gear set; and a torque transfer member drive
mission unit disposed in close proximity to the axle gear
connecting the output element of the front unit gear set
ing and comprising a planetary gear set including an in
and the input element of the rear unit gear set.
put gear, a reaction gear, and an output planet carrier driv
5. ‘In a variable speed drive train for transferring drive
between a vehicle engine and wheel driven axle gearing; 50 ing the axle gearing and having journaled thereon a planet
pinion intermeshing with the input and reaction gears, a
the combination of a front transmission unit positioned
?uid coupling interposed between the reaction and in
immediately adjacent the engine comprising a hydrody
put
gears and adapted, when ?lled with ?uid, to provide
namic torque transmitting device having an impeller
one drive ratio through the rear unit gear set, a one-way
driven ‘by the engine, and a turbine, a lock-up clutch for
for preventing rotation of the reaction gear in
connecting the impeller and turbine together, a planetary 55 mechanism
one direction, when the ?uid coupling is empty, to pro
gear set including an input element connected to the
vide another drive ratio through the gear set; and a torque
turbine, an output element, and a reaction element, a
transfer member drive connecting the front unit planet
one-way mechanism for preventing rotation of the reac
carrier and the rear unit input gear.
tion element in one direction to afford one drive ratio
8. In a variable speed drive train for transferring drive
through the gear set, and a clutch for joining together 60 between a vehicle engine and wheel driven axle gearing;
two elements of the gear set to provide another drive
the ‘combination of a transmission unit positioned immedi
ratio therethrough; a rear transmission unit disposed in
ately adjacent the engine and comprising a hydrodynamic
close proximity to the axle gearing and including a plane
torque transmitting device having ‘an impeller driven by
tary gear set having an input element, an output element
the engine, and a turbine, a lock-up clutch engageable for
driving the axle gearing, and a reaction element, a ?uid 65 connecting the impeller and turbine, a planetary gear set
coupling for connecting, when ?lled with ?uid, two ele
including an input ring gear connected to the turbine, a
ments of the gear set to provide one drive ratio there
reaction sun gear and an output planet carrier having jour
through and means including a brake engageable for
naled thereon a planet pinion intermeshing with the ring
preventing rotation of the reaction element in one direc
and sun gears, a one-way mechanism for preventing rota
tion, when said another device is empty, to ‘afford another 70 tion of the sun gear in one direction to provide one drive
drive ratio through the gear set and disengageable for
ratio through the gear set, and a clutch for connecting the
establishing neutral for the drive train; and a torque trans
reaction sun gear and the ring gear together to provide
fer member drive connecting the output element of the
another drive ratio through the gear set; a rear trans
front unit gear set and the input element of the rear unit
mission unit disposed in close proximity to the axle gear
gear set.
75 ing and including a planetary gear set having an input
'
3,041,891
(3
w
sun gear, a reaction ring gear, and an output planet car
gear set reaction element in one direction, when the ?uid
rier driving the axle gearing and having journaled there
coupling is empty, to afford another drive ratio there
through and disengageable for establishing a neutral for
on a planet pinion intermeshing with the sun and ring
gears, a ?uid coupling interposed between the ring and
sun gears and adapted, when ?lled with ?uid, to provide
one drive ratio through the gear set, means including a
brake engageable for preventing rotation of the reaction
ring gear in another direction to provide, when the cou
the transmission; a third planetary gear set including an
input element connected to the second gear set reaction
element, an output element connected to the driven shaft,
and a reaction element; and a brake for holding the third
gear set reaction element to afford a reverse drive for the
pling is empty, another drive ratio through the gear set
transmission.
and disengageable for establishing neutral for the drive 10
12. In a transmission; the combination of driving and
train, a reverse planetary gear set including an input sun
driven shafts; a hydrodynamic torque transmitting device
gear connected to the rear unit ring gear, a reaction ring
including an impeller connected to the driving shaft, and
gear, and a planet carrier drive connected to the axle car
a turbine; a ?rst planetary gear set including an input gear
connected to the turbine, a reaction gear, and a planet
meshing with the ring and sun gears, and a reverse brake 15 carrier having a planet pinion journaled thereon inter
for holding the reverse ring gear to drive the reverse car
meshing with the input and reaction gears; one-way mech
rier backwards and furnish a reverse drive for the train;
anism for preventing rotation of the ?rst gear set reaction
and a torque transfer member drive connecting the planet
gear in one direction to provide a reduced drive ratio
carrier and the rear unit sun gear.
through the ?rst gear set; a clutch for connecting together
9. In a transmission; the combination of driving and 20 the ?rst gear set input and reaction gears to provide a
rier and having a planet pinion journaled thereon inter
driven shafts; a hydrodynamic torque transmitting device
having an impeller connected to the driving shaft, and a
turbine; a ?rst planetary gear set including an input ele
ment connected to the turbine, an output element, and a
reaction element; means for preventing rotation of the ?rst 25
gear set reaction element in one direction to provide one
drive ratio through the ?rst gear set; means for connect
ing two elements of the ?rst gear set to afford another drive
ratio therethrough; a second planetary gear set including
an input element connected to the ?rst gear set output ele
ment, an output element connected to the driven shaft,
and a reaction element; means for preventing rotation of
the second gear set reaction element in one direction to
afford one drive ratio through the second gear set; and
another hydrodynamic torque transmitting device for
direct drive ratio therethrough; a second planetary gear
set including an input gear connected to the carrier of the
?rst gear set, a reaction gear, and a planet carrier con
nected to the driven shaft and having journaled thereon a
planet pinion intermeshing with the second gear set input
and reaction gears; a ?uid coupling having an impeller
connected to the second gear set input gear and a turbine
connected to the second gear set reaction gear; the ?uid
coupling, when ?lled with ?uid, clutching together the
second gear set reaction and input gears to provide a sub
stantially direct drive ratio through the second gear set;
and brake means engageable for preventing rotation of
the second gear set reaction gear in one direction, when
the ?uid coupling is empty, to provide a reduced drive
ratio through the second gear set and disengageable to fur
clutching together two of the elements of the second gear 35
set to provide another drive ratio therethrough.
nish a neutral for the transmission.
13. In a transmission; the combination of driving and
driven shafts; a hydrodynamic torque transmitting device
driven shafts; a hydrodynamic torque transmitting device
including an impeller connected to the driving shaft, and
having an impeller connected to the driving shaft, and a
turbine; a ?rst planetary gear set including an input ele 40 a turbine; a lock-up clutch for joining the impeller and
turbine; a ?rst planetary gear set including a ring gear
ment connected to the turbine, an output element, and a
10. In a transmission; the combination of driving and
reaction element; a lock-up clutch engageable for con
necting the turbine and impeller; a one-way mechanism
for preventing rotation of the reaction element in one
direction to provide one drive ratio- through the ?rst gear
set; a clutch for connecting two elements of the ?rst gear
set to afford another drive ratio therethrough; a second
planetary gear set including an input element connected to
the ?rst gear set output element, an output element con
nected to the driven shaft, and a reaction element; a ?uid 50
coupling for clutching together, when ?lled with ?uid,
two of the elements of the second gear set to provide one
drive ratio through the second gear set; and including a
brake engageable for preventing rotation of the second
connected to the turbine, a reaction sun gear, and a planet
carrier having a planet pinion journaled thereon inter
meshing with the ring and sun gear; a one-Way brake for
preventing rotation of the ?rst gear set sun gear in one
direction to provide a reduced drive ratio through the
?rst gear set; a clutch for connecting together the ?rst
gear set ring and sun gears to provide a direct drive ratio
therethrough; a second planetary gear set including an
input sun gear connected to the carrier of the ?rst gear
set, a reaction ring gear, and a planet carrier connected to
the driven shaft and having journaled thereon a planet
pinion intermeshing with the second gear set sun and ring
gears; a ?uid coupling having an impeller connected to
gear set reaction element in one direction, when the ?uid 55 the second gear set sun gear and a turbine connected to
the second gear set ring gear; the ?uid coupling, when
coupling is empty, to afford another drive ratio there
?lled with ?uid, clutching together the second gear set
through and disengageable‘for establishing a neutral for
ring and sun gears to provide a substantially direct drive
the transmission.
ratio through the second gear set; and brake means en
11. In a transmission; the combination of driving and
driven shafts; a hydrodynamic torque transmitting device 60 gageable for preventing rotation of the second gear set
ring gear in one direction, when the ?uid coupling is
having an impeller connected to the driving shaft, and a
empty, to provide a reduced drive ratio through the sec
turbine; a ?rst planetary gear set including an input ele_
ment connected to the turbine, an output element, and a
ond gear set and disengageable to furnish a neutral for
the transmission.
14. In a transmission; the combination of driving and
tion of the ?rst gear set reaction element in one direction 65
driven shafts; a hydrodynamic torque transmitting device
to provide one drive ratio through the ?rst gear set; a
including an impeller connected to the driving shaft, and
clutch for connecting two elements of the second gear set
a turbine; a lock-up clutch for joining the impeller and
to afford another drive ratio therethrough; a second
turbine; a ?rst planetary gear set including a ring gear
planetary gear set including an input element connected
reaction element; one-way mechanism for preventing rota
to the ?rst gear set output element, an output element 70 connected to the turbine, a reaction sun gear, and a planet
carrier having a planet pinion journaled thereon inter
connected to the driven shaft, and a reaction element, a
meshing with the ring and sun gear; a one-Way brake for
?uid coupling for clutching together, when ?lled with
preventing rotation of the ?rst gear set sun gear in one
?uid, two of the elements of the gear set to provide an
direction to provide a reduced drive ratio through the ?rst
other drive ratio through the gear set; means including
a brake engageable for preventing rotation of the second 75 gear set; a clutch for connecting together the ?rst gear
8,041,891
’
10
set ring and sun gears to provide a direct drive ratio there
through; a second planetary gear set including an input
to the turbine, an output element and a reaction element,
means for preventing rotation of the reaction element in
one direction to atford one drive ratio through the gear
sun gear connected to the carrier of the ?rst gear set, a
set, and means for clutching together two elements of
reaction ring gear and a planet carrier connected to the
the gear set to provide another drive ratio therethrough;
driven shaft and having journaled thereon a planet pinion
intermeshing with the second gear set sun and ring gears;
a rear transmission unit disposed in close proximity tothe
axle gearing and including a planetary gear set having
a ?uid coupling having an impeller connected to the sec
ond gear set sun gear and a turbine connected to the sec
an input element, an output element driving the axle
ond gear set ring gear; the ?uid coupling, when ?lled
gearing and a reaction element, means for preventing
with ?uid, clutching together the second gear set ring and 10 rotation of the reaction element in one direction to afford
sun gears to provide a substantially direct drive ratio
one drive ratio through the gear set, and means for clutch
through the second gear set; brake means engageable for
ing together two elements of the gear set to provide an
preventing rotation of the second gear set ring gear in one
other drive ratio therethrough; and a torque transfer
direction, when the ?uid coupling is empty, to provide a
member for drive connecting the output element of the
reduced drive ratio through the second gear set and dis 15 front unit gear set and the input element of the rear unit
engageable to furnish a neutral for the transmission; a
gear set.
third planetary gear set including an input sun gear con
References Cited in the ?le of this patent
nected to the second gear set ring gear, a reaction ring
gear, and a planet carrier connected to the driven shaft
UNITED STATES PATENTS
and having journaled thereon a planet pinion intermesha 20
1,203,265
Radcliffe ____________ __ Oct. 31, 1916
2,193,431
2,203,546
2,351,213
2,378,035
Probst ______________ __ Marl12,
Pollard ______________ __ June 4,
James ______________ __ June 13,
Pollard ______________ __ June 12,
2,381,772
2,437,333
Pentz ________________ __ Aug. 7, 1945
Pollard ______________ __ Mar. 9, 1948
hydrodynamic torque transmitting device having an im
peller driven by the engine, and a turbine, at lockup 30
clutch for connecting the impeller and turbine together,
2,645,135
2,687,657
2,713,273
2,831,372
Frank _______________ __
Kugel et a1 ___________ .._
Ebsworth ____________ _._
Boughner ____________ __
a planetary gear set including an input element connected
2,858,714
Black ________________ __ Nov. 4, 1958
ing with the third gear set sun and ring gears; and a
reverse brake for preventing rotation of the third gear
set ring gear to provide reverse drive through the trans
mission.
15. In a variable speed drive train for transferring 25
drive between a vehicle engine and wheel driven axle
gearing; the combination of a front transmission unit
positioned immediately adjacent the engine comprising a
July
Aug.
July
Apr.
14,
31,
19,
22,
1940
1940
1944
1945
1953
1954
1955
1958
Документ
Категория
Без категории
Просмотров
0
Размер файла
967 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа