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Sepeì 24, 1946.' ,
i
P. om»
TRANsMIssïoN
"2,408,336
Filed Jan. a, »'1945»
~ 72mm@
-
2,408,336
Patented Sept. 24, >1946
UNITED ls’nrrss vPri/Tieni“ OFFICE
Palmer Orr, Muncie, Ind., a‘ssignor to Borg
, Warner Corporation, Chicago, Ill., a corpora
rtion of Illinois
Application January 8, 1943, Ser-iai Nar/171,666
5 claims.
(o1. iai-6) `
i My invention >rentes ioiraiismission suitable Y
for use between the propellerïand'engineof an » Y
aeroplane, and more particularly,v my invention
'
relates to lubricating systern'sïfor suchztransmis
’
described >and claimed for carrying out the above
stated objects and-such other objects as will ap
peary from the following description of a certain
preferred embodiment illustrated in the accom
ci
sions.
2
tions, arrangements and devices to be hereinafter
panying drawing.
`
¿
Transmissions of the planetary'type Ahave been
Referring now to the drawing, the illustrated
proposed for .use Vbetween Íthe engine and Spro
tiansmissionr comprises a housing Iii in which is
pelle'r‘fîo‘f «aeroplanes ‘ One such transmission
journaled a shaft Il by means of a bearing i2.
comprises a ring gear; -a sunïgear, planetl gears in
The shaft i i is adapted tc'have fixed thereon,v to
y10
mesh with the ring and sun gearsV and a carrier
the left of the bearing I2, as seen in theV drawing,
for the planet gears, and the transmission is
anmaeroplane.propeller (not shown), and the '
commonly yconnected with its ring .gear driven by
shaft has splined thereon a carrier'or support
the engine crank shaft, with the carrier connect
member i3 in which is disposed a plurality of
ed to drive the propeller, and with the sun gear
shafts iii (one being shown .inthe drawing). A
of the viti‘ansrnission held _ stationary.
pin is is provided for iixing each of the shafts
i. ; It is an object ofV my invention to provide, in a
ibi with respect to the member i3. A planet gear
~ transmission'of thistype, an improved system
Iii is rotatably disposedron-each of the shafts I4
forv lubricating the teeth ofA the> gears and also
by means of rollers Ii.Y ¿i sun gear i8V is pro
the bearingsbetweenthe fplanetrgears and the
carrier for the »planet gears.V
"
.
vided ccaxiaily disposed with respect to the shaft
ii and in mesh with the planet gears iê. The
'
More particularly it is an object of myinven
tion to provide such an improved lubricating sys
gear i8 is spiined in an annular member it which
is Vbolted to the housing Ii)l and which thus holds
>the sun gear I6 stationary and in position. A
Vtern comprising an annular pressure chamber
Awhich is in communication with a source of lu
bricant and with the bearings of the planet 25 ring gear 25a-is in inesh with the planet pinions IG
andis splined on a‘member 2i which is adapted
gears on the'planet gear carrier and whichro
to be connected to and carried rby the crank
tates with the gear carrier whereby lubricant is
shaft of an aeroplane engine (not shown). It
forced into the bearings due to centrifugal force
Vwill be understood that the crank shaft func
acting on the lubricant in the pressure chamber.
«It -isanother object to provide means for forcing 30 tio-ns to» hold the member ZI and the ring gear Zâ’i
in their position relative to the planet gearsflâ
the lubricant into the pressure chamber whereby
the bearings for the planet gears are'lubricated
by ,lubricant under pressure due to centrifugal
force and also to the said means,
as shown in the drawing. .
Y
VThe shaft il, which is adapted to carry an
aeroplane propeller, functions to drive the pro
o
peller at a slower speed than the member 2l and
'ring gear 2i! are driven, as by the crank shaft of
mission that the annular pressure chamber is
an aeroplane engine. The ring gear 20 rotates
formed by the planet gear carrier and an annu
while the sun gear It is stationary, and the planet
lar member fixed with respect to the carrier. It
gears I@ are thus caused to rotate about the sun
is contemplated that the annular member shall
preferably be of sheet material in order to add 40 gear I8, and they drive the carrier'member I3 and
' thereby the shaft il at some speed slower than
little to the weight of the transmission.
It is another object to so construct the trans
It is still another object to pro-vide a passage
in the planet gear carrier irl-communication with '
the pressure chamber for directing a stream of
lubricant on the meshing teeth of each of the
vpla-net gears .and one of thegears in‘mesh with
the planet gears.
l „fit is a further object to _provide a passage be
tween the lubricant pressure chamber and each
‘of the bearings forthe planety gears which has a
' perforated member therein, with the perforation
being smaller than the cross-sectional area of
the passage for limiting the iiow of lubricant into
the passage.
/
.
.
'The invention >consists` ofthe novel' construc
35
that> o-f the ring member 29.
,
The lubricating system for the transmission
comprises a central passage 22»eXtending into the
shaft IIïfrom ther end of the shait‘which is
adapted tc be adjacent the engine for driving the
vtransmission and radially ,extending passages 23
V(one1being shown _in the drawing) in the shaft.r
The carrier member I3 is formed with aplurality
of passages E@ (one being shownin the drawing)
each of which is inV communication with one of
the passages 23 in the shaft Ii. The carrier
member I3 is‘iorrned with other passages 25 (one
being shown 1in the drawing) each of which is
55 r-disposed'so vas to direct‘iiuid passing Vthere
23,408,336
».
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¿
,.
,
„
4
through from the right side of the carrierx as
by a stream of lubricant passing through the
openings 25 and forcibly impinging on the
shown in the ligure, on to the meshed teeth of
one of the planet gears It and the sun gear I8.
Each of the shafts lil is provided with a central
passage 26 therein extending into the shaft from 5
meshed teeth. The total elïective cross-sectional
area of the outlets of the reservoir 32 is less
the ,right end of the shaft, as seen in the figure,
of the reservoir; that is to say, the sum of the
than the total cross-sectional area of the inlets
and each shaft is also provided with a passage
cross-sectional areas of the passages 25 plus the
sum of the effective cross-sectional areas of the
conduits to the rollers I'I> from the reservoir is
through the passage 2l from the passage 26 on l0 less than the sum of the cross-sectional areas of
to the rollers il’. The passage 26 in each of the
the passage 2li, and lubricant under pressure is
2l' which is in communication with the passage
2t and is disposed to direct any fluid passing
shafts lll is preferably provided with a perforat
ed cup 28 in its open end for forming a constrict
thus always maintained in the reservoir 32 when
the transmission is in operation.
ed opening for the passage.
The planetary gearing of the illustrated trans
A stamped annular sheet metal plate member 15 mission is well lubricated by means of the lubri
29 is provided on the right side of the carrier
cation system shown and described. The pro
member lâ as seen in the ñgure, and the plate
vision of the system advantageously adds little
member 2Q is ñxed with respect to the carrier
to the cost of the transmission as a whole and
member E3 by means of a threaded collar 30 on
adds little to the weight of the transmission.
shaft Il and screws 3| in the carrier member. 20
I do not intend to limit the invention to the
The plate member 29 functions with the carrier»
details shown and described, except only insofor
member i3 to provide an annular, fluid-tight
as certain of the appended claims are specifically
container or reservoir 32‘ at the right side of the
so limited, as it will be obvious that modifications
carrier member i3 which reservoir is in com
may be made without departing from the prin
munication with the passages 24 and 25 in the 25 ciples of the invention.
'
carrier member and with the passages 26 in the
I claim:
shafts le.
1. In power transmission mechanism, the com
The passage 22 is connected with a lubricant
bination of a hollow rotatable shaft; a plurality
source (not shown), and when the gear carrier
of power transmitting elements; a support on said
i3 is rotating, lubricant flows from the passage
shaft for rotatably mounting said elements about
22, through the passages 23 and 2íâ and into the
the axis of said shaft; a source of lubricant under
reservoir 32 on the right side of the lplanet carrier
pressure discharging into said shaft; an annular
i3. The oil ñows from the fluid container
pressure chamber sealed wholly upon and rotat
through the oil cups 2B and into the passages 26
able with said support; inlet conduits for said
and 2ï in the shafts íâ and on to the rollers Il, 35 chamber communicating with said shaft; and
and the rollers are thereby lubricated.
Oil also
discharge conduits connecting said chamber to
flows from the reservoir 32' through the passages
said power transmitting elements, the sum of the
25 in the carrier i3 and is directed thereby on
effective cross-sectional areas of the inlet con
to the meshed teeth of each of the planet gears
duits exceeding the sum of the effective cross
i6 and the sun gear i3. The meshed teeth of 40 sectional areas of the'discharge conduits, where
the planet gears iii and the ring gear 20 are lubri
by lubricantunder pressure is maintained in said
cated by means of oil which has passed `from
chamber at all times.
the passages 25 on to the teeth of the planet
2. In power transmission mechanism, a hollow
gears and which is carried on the teeth of the
rotatable shaft; a support having a hub porton
latter gears as they rotate. This flow of lubri 45 and a peripheral portion joined thereto; a plu
cant to the rollers Il and gear teeth is due to
rality of power transmitting members rotatably
the centrifugal force on the lubricant in the
mounted on said support and arranged radially
reservoir 32 caused by the rotation of the reser
around the axis of said sup-port _and hub; an an#
voir. The reservoir thus acts as a lubricant pres
nular member assembled with the hub and
sure chamber and as a pump for lubricating the
peripheral portions of said support and having
parts of the transmission. Although the reser
an intermediate portion in spaced relation to
voir 32 acts as a pump, in order to obtain a
greater flow of lubricant, the lubricant is pref
erably forced into the passage 22 by means of a
pump (not shown) driven by the aeroplane en
said support, said annular member being con
structed and arranged to constitute with said
support a ñuid pressure chamber upon the side
55 of said support opposite said power transmitting
members; and a source of lubricant under pres
sages 25 and 26 to lubricate the meshed teeth of
sure communicating with said shaft, said hub and
the gears it and i8 and the rollers Vi respectively
shaft being formed with passageways therein
is drained from the housing I3 to any suitable
communicating with the hollow portion of said
sump (not shown) by means of a channel 33 pro
60
shaft
and said pressure chamber, and said sup
vided in the housing.
port being formed with passageways therein ad
rThe perforated caps 2S function to effectively
jacent said power transmitting members for
decrease the cross-sectional size of the lubricant
transmitting lubricant from said pressure cham
conduits between the reservoir 32 and rollers l'l,
ber to said power transmitting members.
including the passages 26 and 2l, to the size of 65 j
3. In power transmission mechanism, a hollow
the perforations in the caps. The larger pas
rotatable shaft; a support having a hub portion
sages 2'5 are preferably provided instead of ones
and a peripheral portion jointed thereto; a plu
the size of the openings in the caps 23, as it is
rality of power transmitting members rotatably
easier to drill the passages of larger diameter,
mounted on said support and arranged radially
and the carrier i3 is thereby made lighter in 70 around the axis of said support and hub; an an
weight. rI‘he openings in the caps 28 and the
nular member assembled with the hub and
openings 25 are of such relative cross-sectional
peripheral portions of said support and having
sizes that both the rollers l'l and the meshed
anintermediate portion in spaced relation to said
teeth of the gears I6 and I8 are effectively lubri
support, the inner and outer margins of said an
gine. The lubricant iiowing through the pas
cated, with the meshed teeth being lubricated 75 nular member having fluid tight relationship
2,408,336
5
with respect to said hub and the periphery of said
support to provide a sealed pressure chamber
carried by said support; and a source of lubricant
under pressure communicating with said shaft,
said hub and shaft being formed with passage
ways therein communicating with the hollow
portion of said shaft and said pressure chamber,
and said support being formed with passageways
therein adjacent said powerrtransmitting mem
bers for transmitting lubricant from said pres
sure chamber to said power transmitting mem
bers,
4. In a power transmission mechanism, the
combination of a plurality of gears, a support for
said gears for mounting them for rotation about
a central axis, each of said gears also being rotat
able about its own bearing, which bearings are
carried by said support, a gear in mesh with said
6
other passageways in said support for connecting
said chamber and said bearings.
5. In a power transmission mechanism, the
combination of a plurality of gears, a support for
said gears for mounting them for rotation about
a central axis, each of said gears also being ro
tatable about its own bearings, which bearings
are carried by said support, a gear in mesh with
said first-named gears, a source of lubricant un
der pressure, an annular member secured to said
support to form therewithA a duid-tight lubricant
chamber, said support being provided with out
let passageways for connecting the chamber with
said bearings and with inlet passageways for con
r necting the chamber with said lubricant source,
said support being also provided with outlet pas
sageways in communication with said chamber
for directing lubricant on the meshed teeth of
said nrst and said second-named gears, the sum
first-named gears, a source of lubricant, an an
nular member secured to said support to form 20 of the effective cross-sectional areas of said inlet
passageways being greater than the sum ofthe
therewith a fluid-tight lubricant chamber, said
effective cross-sectional areas of said outlet pas
chamber being in communication with the source
sageways whereby lubricant under pressure is
of lubricant, passageways through said support
maintained lin said chamber at all times.
and communicating with said chamber for di
>
PALMER ORR.
recting lubricant upon the meshed gears, and 25
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