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Патент USA US2127655

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' Aug. 7 23, 1938.
~ 2,127,655
V. B. STROMQUIST ET AL
PLANETARY TRANSMI S ION
Filed April 19, 1955
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INVENTORS-
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Patented Aug-23,1938
$327,655
PATENT orrlce
_ UNITED STATES
2,122,655
PLANETARY TRANSMISSION
Vidmar B. Stromquist, Farmington', and William
T. Dunn, Detroit, Micln, assignors to Chrysler
Corporation, Highlan(1 Park, Mich,
a corpora
tion of Delaware
Application April 19, 1935, Serial No. 17,158
14 Claims.
(Cl. 74-268)
This invention relates to power transmissions
and refers more particularly to. speed ratio
changing devices adapted for use in motor ve
mount the axles 22. Certain of the axles 22, be
tween adjacent gears 23, may serve merely as
spacers for the carriers 2i and 25, as illustrated
hicle drives.
at the bottom portion of the carriers. Bushings
_
Our invention has among its objects the provi
sion of an improved power transmission of the
planetary gear type; a transmission having a
plurality of speed ratio drives including low, sec
ond, third or direct, and reverse, and which em
10 bodies improvements in simpli?cation of parts,
durability and low manufacturing'cost. _
Further objects of our invention are to provide
an improved planetary gear transmission com
prising a single driving sun gear for effecting the
15 v.speed ratio drives; a‘ planetary transmission
which offers better opportunity for providing the
' desired-speed ratio values with relatively smaller
gear sizes and over-all transmission size than has
heretofore been obtained; a transmission provid
20 ing a relatively faster second speed ratio'for' a
given size of gears and a reduction in pinion
speeds, especially when idling.
-Further objects and advantages of our inven
tion will be more apparent from the following de
25 tail description of one illustrative embodiment
thereof, reference being had to the accompany
, ing drawing in which the single ?gure repre
sents a sectional elevational view longitudinally
through our transmission.
or washers 2'! are located at opposite sides of
each gear 23.
'
The gears 23 mesh with the primary driving
sun gear 28, preferably formed as a part of shaft
65, and also with the internal gear annulus 29
carried by the low speed drum 3!] which is adapt
ed for engagement by a brake 3i. This brake
3i is adapted to hold drum 30 against rotation
in a backward direction opposite to the forward
direction of rotation of shaft i5 and thereby pro
vide the necessary reaction for obtaining the low 15
speed drive as will be presently more apparent.
The carrier 25 has a forward cylindrical ?ange
52 formed with internal gear 33 meshing with
planetary gears 34 of the second speed train. The
axles 22K mounting gears 34 are mounted be
tween a rear carrier 35 and a forward carrier 38,
the latter having a cylindrical ?ange 31 closely
surrounding ?ange 32 and forming an extension
of drum .30.
-
Gears 34 also engage the second speed sun gear
38 fixed to the hub 39 of the radial ?ange 4na
which in turn has-secured thereto the second
speed drum 40 closely surrounding ‘?ange 37.
The drum 40 is adapted for engagement by a
second speed brake 4i. The brake 4! is adapted
to prevent backward rotation of drum 40 and
In the drawing, reference character i0 indi
cates the main casing for housing the working
parts, the casing front and rear wall structures sun'gear 38 to provide the reaction for the secii and I2 respectively providing-the anti-friction ond speed drive.
bearings I3, M for journalling the driving and _ The drum 40' has a forward extension 42 pro
viding the direct speed drum preferably in the
35 driven shafts i5, i6 respectively.
form of a friction cone 43 adapted for engage
The driving shaft l5 has a forward end i‘! jour
nalled by a bushing, IS in the forwardly opening ment by the companion cone 44 which is slidable
bore ill of the driven shaft IS, the forward end on shaft I! through the hub 46. The hub 46 may
20 of the driven shaft thus piloting the'rear end , be 'moved axially of shaft i5 by any suitable
manually actuated shifting device (not shown)
40 of the driving shaft. For convenience‘ of refer
30
ence, the drivingshaft i5 may be referred to as
connected to the ring shown as surrounding the
having forward rotation, viz., clockwise when
thrust bearing 45. The cone ‘44 is drivingly con
nected to shaft l5 by reason of the hub 41 keyed
at 48 to said shaft and having outer teeth 49
drivingly and slidably engaging internal teeth 50 _
‘ viewed from the front of the transmission.
The
shaft end 20 terminates forwardly in the radially
45 ?anged carrier 2i for the axles 22 of the ?rst or
low speed planetary gears? 23. According to gen
erally customary practice, each planetary gear
train includes a plurality of spaced planetary
gears preferably three in number, one of the
50 gears 23 of the low speed train ‘being shown in
the drawing.
1
-
.
-
The axle 22 preferably journals its gear 23 by
‘ the antifriction rollers 24, the companion car
rier 25-being secured to carrier 2| at circumfer
55
entially spaced intervals by the'rivets 26 which
carried by cone 44.
'
‘For obtaining a reverse drive, the shaft I6 has
a toothed engagement at 5| with a sleeve 52
mounted on the shaft end 20, this sleeve journal
ling the sun gear 53 having the forward radial
?ange 54 drivingly connected to drum 30, as by
the toothed connection 55. The sleeve 52 has a
rear radial ?ange 56 providing a carrier for the
hubs 22b of the planetary gears 51, the forward
carrier comprising a ring 55.
55
2
2,127,655
The gears Bl mesh with sun gear 53 and also
with internal gear 58 of the reverse drum 80
adapted for engagement by brake ‘6i. Drum 80
has a rear ?ange 82 extending inwardly to its
.hub 63 journalled between shaft l8 and bearing
88 carried by casing ?ange 65. The usual speed
sun gear with said low speed annulus released
from its said braking means for causing said
ometer drive gears are illustrated at 5B and shaft
primary sun gear to drive said driven shaft in _
it may, if desired, carry a brake drum 61.
second speed.
It will be noted that the parts are closely nested '_
10
a second speed carrier for said second speed
planetary gears directly drivingly connected to
said low speed annulus, and braking means
adapted to arrest rotation of said second speed
together against displacement especially axially.
'
v
2. In a planetary gear transmission, a driving
shaft, a driven shaft coaxially arranged with re 10
Any well known means may be provided for se
spect to said driving shaft, a primary sun gear
lectively operating brakes 3|, 4|, 6! and cone - carried by said driving shaft, low speed planetary
lid for controlling the drive, such means not be_ gears driven by said primary sun gear, a low
ing illustrated as it ‘is well known. Normally, as ' ., speed annulus driven by said low speed planetary
16 illustrated, the brakes have clearance with their gears, a low speed carrier for said low speed plane 15
associated drums. For obtaining a drive in low
gear, brake 3| is actuated to arrest rotation of
drum 30, all other brakes being free together
with cone 66. Similarly, for second speed, brake
20 5| grips drum 80; for direct speed, cone M is
moved to engage drum M; for reverse, brake Bl
grips drum 60. Only one ‘of the brakes or cone
M is actuated at a time into gripping engage
ment with its associated drum, all other parts
25 of the mechanism running freely.
When brake 3! is actuated for low gear drive,
such drive is obtained by sun gear 28 operating
planet gears v23 about their axes, the internal
gear 29 being ?xed and carrier 2| revolving in
30 the direction of drive shaft l5 but at much slower
speed.
-
.
When second speed‘ is desired, brake 4| acts
to hold drum 40 and sun 38 ?xed, the driving
sun gear 28 acting on planetary gears 23 to
35 drive shaft It by reason of the interconnection
provided between carrier 36 and internal gear
29 and between carrier 25 and internal gear 33,
the drum 30 being freely rotatable.
When cone 48 engages the cone 42 to obtain
40 direct drive, the sun gears 28 and 38 are both
tary gears directly drivingly connected with said
driven shaft for rotation at the same speed there
with, braking means adapted to arrest rotation
of said low speed annulus for causing said pri
mary sun gear to drive said driven shaft at low 20
speed, a second speed sun gear coaxial with said
driving shaft and rotatable independently there
of, a second speed annulus directly drivingly con
nected to ‘said low speed carrier, second speed
planetary gears drivingly engaged with said sec
ond speedv sun, gear and second speed annulus,
a second speed carrier for said second speed
planetary gears directly drivingly connected to.
said low speed annulus, braking means adapted
to arrest rotation of said second speed sun gear 80
with said low speed annulus released from its
said braking means for causing said primary sun
gear to drive said driven shaft in second speed,
and direct drive clutching means for directly
drivingly connecting said driving shaft with said
second speed sun gear, with said low speed
annulus and said second speed sun gear released
from’ their respective braking means aforesaid,
for causing said driving shaft to directly drive
said driven shaft.
,
driven at the speed of shaft l5 causing the ?rst
3. In a planetary gear transmission, a driving
and second speed gear trains to rotate as a unit
shaft, a driven shaft coaxially arranged with re
spect to. said driving shaft, a primary sun gear
with shaft IS. The driven shaft I6 is thus directly
connected to shaft l5 through the carrier 2 I.
For-reversing the drive, brake 6| engages drum
45
60, the sun gear 28 transmitting the drive through
the reverse gear train, it being noted that planet
gear carrier 56 is ?xed to the driven shaft l6
while the freely rotatable drum 30 is connected
carried by said driving shaft, low speed planetary
gears driven by said primary sun gear, a low
‘speed annulus driven by said low speed planetary
the shafts.
-
4
'.
It will be understood that such terms as "low”,
“second”, “third or high" as applied to the speed
ratios are used in a relative ‘sense in order to
indicate progressions in speed ratio values.
We claim:
‘
.
45
gears, a low speed carrier for said low speed
planetary gears directly drivingly'connected with
said driven shaft for rotation at the same speed
50 to sun gear 53. The internal gear 58 being held, , therewith, braking means adapted to arrest ro
produces the reverse speed ratio drive between
40
tation of said low speed annulus for causing said
primary'sun gear to drive said driven shaft at
low speed, a second speed sun gear coaxial with
‘said driving shaft and rotatable independently
50
thereof, a second speed annulus directly drivingly 65
connected ‘to said low speed carrier, second speed
planetary gears’ drivingly engaged with said sec
1. In a planetary gear transmission, a driving
shaft, a driven shaft coaxially arranged with re
ond speed sun gear and second speed annulus,
a second speed carrier for said second speed plane
carried by said driving shaft, low speed planetary
tary gears directly drivingly connected to said 60
low speed annulus, and braking means adapted
60 spect to said driving shaft,la primary sun gear
gears driven by said primary sun gear, a low
to arrest rotation of said second speed sun gear
speed annulus driven by said low speed planetary
with said low speed annulus released from its
said braking means for causing said primary sun
gear to drive said driven shaft in second speed,
gears, a low speed carrier for said low speed
planetary gears directly drivingly connected with
said driven'shaftfor rotation at ‘the same speed
therewith, braking means adapted to arrest rota
tion of said low speed annulus for causing said
a reverse speed sun gear coaxial with said driven
shaft and rotatable independently thereof, a re
verse speed annulus, reverse speed planetary
gears drivingly engaged with said reverse speed
primary sun gear to drive said driven shaft at low
70 speed, a second speed sun gear coaxial with said sun gear and reverse speed annulus, means di
driving shaft and rotatable independently there
rectly drivingly connecting said low speed annulus
of, a second speed annulus directly drivingly con ‘with said reverse speed sun gear, a reverse speed
nected to said low speed carrier, second speed carrier for‘ said reverse speed planetary gears
planetary gears drivingly engaged with said sec-"
75 ond speed sun gear and second speed annulus,
v0.
directly drivingly connected to said driven shaft,
and braking means adapted to arrest rotation of 75
3
9,187,855
said reverse speed annulus, with said low speed - nulus released from its said braking means, for
annulus and said second speed sun gear released causing said primary sun gear to drive said driven -
from their respective braking'means aforesaid,
shaft in reverse, and an additional planetary gear
for causing said primary, sun gear to drive said
set operably connected to said low speed planetary
driven shaft in reverse.
gear set,.control means for said additional gear .
-
4. In a planetary gear transmission, a driving
shaft, a driven shaft coaxially arranged with re
spect to said driving shaft, a primary sun gear
carried by said driving shaft, low speed planetary
set, said additional gear set being so constructed
and arranged as to drive said driven shaft for
wardly from the primary sun gear of said low
speed gear set by compounding said low speed
10
gear ~set with said additional gear set.
6. In a planetary gear transmission, a driving
shaft, a driven shaft, a plurality of forwardly
driving planetary gear trains for drivingly ,con- ‘
necting said shafts, a single driving sun gear car
ried by said driving shaft for selectively trans 15
mitting a plurality of forward drives-to said driven
mary sun gear to drive said driven shaft at low shaft through said gear trains, means for directly
speed,-a second speed sun gear coaxial with said drivingly connecting said shafts including a driv
ing clutch member, a hub connected to’ said driv
driving-shaft and rotatable independently there
20 of, a second speed annulus directly drivingly con- . ing shaft and having a sliding driving connection‘ 20
nected to said low speed carrier, second speedv } with said driving clutch member, means including
a thrust member slidable on said driving shaft '
planetary gears drivingly engaged with said sec
ond speed sun gear and-second speed annulus, a independently of said hub for moving said driving
clutch member, and a driven clutch member en
second speed carrier for saidsecond speedplane
gageable with said driving clutch member, said 25’
25 tary gears directly drivingly connected to said low
10 gears driven by said primary sun gear, a low speed
ann'ulus driven by said low speed planetary gears,
a lowspeed carrier for said low speed, planetary
gears directly drivingly connected with said
driven shaft for rotation at the same speed there
15 with, braking means adapted to arrest rotation
of said low speed annulus for causing said pri
speed annulus, braking means adapted to arrest
rotation of said second speed sun gear with said
low speed annulus released from its said braking
means for causing said primary sun gear'to drive
30 said driven shaft in second speed, and direct drive ‘
clutching means for directly drivingly connecting
said driving shaft with said second speed sun gear,_
with said low speed annulus andsaid second speed
sun gear released from their respective braking
35 means aforesaid. for causing said driving shaft to
directly drive said driven shaft, areverse speed
sun gear coaxial with said driven shaft and rotat
able independently thereof, a reverse speed an
nulus, reverse speed planetary gears drivingly en
driven clutch member being drivingly connected
to one of said planetary gear trains.
»
’ 7. In a planetary transmission having a driving
shaft, a plurality of groupslof forwardly driving
planetary gear sets operatively associated with 30
said driving shaft, a driven shaft in operable con
nection with the ?rst group of gears, means for
driving said drivenshaft at one forward reduction
speed from the sun gear of the ?rst group of gears
by locking the annulus of the ?rst gear group, 35
means whereby another forward reduction drive
resulting from the compounding of the ?rst and
second gear groups is obtained by locking the
sun of the second groupof gears, the planet gear
carrier of said ?rst gear group being directly 40
40 gaged with said reverse speed sun gear and re
verse speed- annulus, means directly drivingly
connecting said low speed annulus with said‘ re:
reverse planetary-gear set mounted on said driven
- verse speed vsun gear, a reverse speed carrier for
shaft and having the planet gear carrier thereof
drivingly connected with said driven shaft, and a
‘said reverse speed planetary gears directly driv-\ ?xed with said driven shaft and the sun thereof
45 ingly connected to said driven shaft, ‘and braking ?xed with the annulus of the ?rst gear group.
means adapted to arrest rotation of said reverse
speed annulus, with said lowspeed annulus, 'sec
ond speed sun gear and direct speed braking and
clutching means respectively released, for caus
50 ing said primary sun gear to drive said‘ driven
shaft in reverse.
'
8.‘ In a planetary transmission having a driving
shaft, a plurality of groups of forwardly driving
planetary gear sets operatively associated with
said driving shaft, a driven shaft in operable con
nection with the ?rst group of gears. means for 50
driving said driven shaft at one forward reduc
5. In a planetary gear transmission,.a driving - tion' speed from the sun gear of the ?rst group
of gears by locking the annulus of the ?rst gear
shaft, a driven shaft coaxlally arranged with re
spect to said driving shaft, a low speed planetary group, means whereby another forward reduc-.
tion drive resulting from the compounding of the 55
55 gear set comprising a primary sun gear car
_ried by said driving shaft, low speed planetary ?rst and second gear groups is obtained by lock
gears driven by said primary sun gear, a low
ing the sun of the second group of gears, the
speed annulus driven by said low speed'planeta'ry
gears, a low speed carrier for said low speed
60 planetary gears directly drivingly connected with
planet gear carrier of said ?rst gear group being
directly drivingly connected with said driven
said driven shaft for rotation at the same speed
therewith; braking means adapted to arrest rota
tion of said low speed annulus for causing said
shaft, and means for locking the sun gear of said
second gear group with said driving shaft to pro
vide a direct‘drive between said shafts.
_ 9.’ In a planetary transmission having driving‘
primary sun gear to drive said driven shaft at low
and driven shafts, a plurality of planetary gear
a reverse speed annulus, reverse speed planetary
the drive shaft to the driven shaft, a. reversing
planetary gear train adapted to connect said
shafts fora reverse drive from the drive shaft to
a
trains adapted to selectively transmit low and 65
65 speed, a reverse speed sun gear coaxial with said
driven shaft and rotatable independently thereof, 7 intermediate forward speed reduction drives from
gears drivingly engaged with said reverse speed
sunv gear and reverse speed annulus, means direct
70 ly drivingly connectingsaid low speed annulus
with said reverse speed sun gear, a reverse‘ speed
carrier for said reverse speed planetary gears
directly drivingly connected to said driven shaft,
braking means adapted to arrest rotation of said
75 reverse speed annulus, with said low speed an
the driven shaft, said low speed gear train in 70
cluding a sun gear driven from the drive shaft
and a planet pinion’ carrier‘connected to the
driven shaft and furtherfincludingan annulus
gear, said reversing gear train includinga sun
gear connected to rotate with' said annulus gear
4
2,197,655
and a planet pinion carrier connected to said tion gearing for driving the driven shaft from
driven shaft, said intermediate speed gear train Y the driving shaft in a forward direction of rota
including a planet pinion carrier also connected
tion and at a slower speed, comprising, a sun
to rotate with said annulus gear and a sun gear
gear element driven directly from the driving
shaft, a planet gear element meshing with said 5
disposed for rotation relative to said drive shaft.
10. In a planetary gear transmission, driving
and driven coaxially arranged shafts, a plurality
of planetary gear trains adapted to selectively
transmit forward reduction drives between said
10 shafts, a reversing planetary gear train interme
diate said shafts, a single sun gear directly driv
ingly connected to said driving shaft and oper
ably'connected with each of said gear trains, a
planet pinion meshing with said sun gear, and a
15. carrier for saidv pinion directly drivingly con
nected with said driven shaft during said forward
and reverse drives, said reversing gear train hav
ing an element thereof connected to said driven
shaft.
20
7
11. In a planetary gear transmission, driving
and driven coaxially arranged shafts, a plurality
of planetary gear ‘trains adapted to selectively
transmit forward reduction drives between said
shafts, a reversing planetary gear train interme
diate said shafts, a single sun gear directly driv
ingly connected to said driving shaft and oper
ably connected with each of said gear trains, a
plurality of coaxial control drums for said gear
trains, said drums having substantially equal di
ameters and being arranged to house said gear
trains, a planet pinion meshing with said sun
gear, and a carrier for said pinion directly driv
ingly connected with said driven shaft during
said forward and reverse drives, said reversing
gear train having an element thereof connected
to said driven shaft.
12. In a planetary transmission having a driv
ing shaft, a plurality of groups of forwardly
driving planetary gear sets operably associated
4G with said driving shaft, a driven shaft in oper
able connection with the ?rst group of gears,
means for driving said driven shaft at one for
ward reduction speed from the sun gear of the
?rst group of gears by locking the annulus of the
?rst gear group, means whereby another forward
reduction drive resulting from the compounding
of the ?rst and second gear groups is obtained by
locking-the sun of the second group of gears, the
planet gear carrier of said ?rst gear group being
directly drivingly connected with said driven
shaft, and a reverse drive planetary gear set in
cluding a sun gear element and a planet pinion
element meshed therewith, said reverse gear set
also including a carrier element for said planet
pinion element, one of said elements of said re
verse gear set having continuous vdrive connection
with said driven shaft during said forward and
reverse drives.
sun gear element, a carrier element for said
planet gear element directly drivingly connected
with the driven shaft, an annulus gear element
meshing with said planet gear element, means
operable to prevent backward rotation of said an 10
nulus gear element thereby to effect said drive
through said planetary reduction gearing; addi- '
tional planetary reduction gearing for driving
the driven shaft from the driving shaft in .a for
' ward direction of rotation by compounding with 15
the ?rst said‘ planetary reduction gearing to ef
fect a drive faster than that aforesaid, said ad
ditional planetary reduction gearing comprising,
a sun gear member, a planet gear member mesh
ing with said sun gear member, a carrier mem
20
ber for said planet gear member directly driving
ly connected with said annulus gear element, an
annulus gear member meshing with said planet
gear member and directly drivingly connected
with said carrier element, and means operable to 25
prevent backward rotation of said sun gear mem
ber thereby to effect said faster drive.
14. In a planetary gear transmission; a for
wardly rotatable driving shaft; a driven shaft co
axial with the driving shaft; planetary reduction 30
gearing for driving the driven shaft from the
driving shaft in a forward direction of rotation
and at a slower speed, comprising, a sun gear
element driven directly from, the driving shaft, 2.
carrier element directly drivingly connected with 35
the driven shaft, a planet gear element carried,
by said carrier element and meshing with said
sun gear element,’ an annulus gear element mesh
ing with said planet gear element, means oper
able to prevent backward rotation of said annu 40
lus gear element thereby to. effect said drive
through said planetary reduction gearing; addi
tional planetary vreduction gearing for driving the
driven shaft from the driving shaft in a forward
direction of rotation by compounding with the 45
?rst said planetary reduction gearing to effect a
drive faster than that aforesaid, said additional
planetary reduction gearing comprising, a sun
gear member, a planet gear member meshing
with said sun gear member, a carrier member for 50
said planet gear member directly drivingly con
nected with said annulus gear element, an annu
lus gear member meshing with said planet gear
member and directly drivingly connected with
one of the ?rst two said elements of the ?rst said 55
planetary reduction gearing, and means operable
to ‘prevent backward rotation of said sun gear
member thereby to effect said faster drive.
13. In a planetary gear transmission; a for
wardly rotatable driving shaft; a driven shaft
coaxial with the driving shaft; planetary reduc
VmMAR B. STROMQUIST.
WELIAM T. DUNN.
60
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