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Патент USA US2406388

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. Aug. 27, 1946.
TURBO-sUPERCHARMJRFiled June 10, 1941
2 Sheets-_Sheet 2 ~
Fig. 2.
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Patented Aug. 27, 1946
2,406,388 "f
Anthony J. Larrecq. Indianapolis, Ind.. assignor
to General Electric Company, a corporation of
New York
Application J une 10, 1941,
Serial No. 397,378
4 Claims. (Cl. 184-6)
In order to reduce
the nozzle box, a jacket is provided which sub
ing and supporting pported thereon by connect
tion of the wall 24 members 2S. , An inner por
forms a plurality of openings
21 for conducting cooling
medium to the space
formed between the casing 2|
and the walls 24,
economy are attained.
For a consideration of what
panying drawings.
The drawing Fig. 1 illustrates' a sectional
of a tur
Fig. 2 is a section along line 2*2 of Fig. 1; and
shown in the draw
IIJ, a centrifugal
, and a speed-increasing gear- »
turbine and for supporting the turbine on the
when used on aircraft, are operated at high 25
speeds of the order o_f 20,000 R. P. M. and above.
The jacket wall 24 is provided with a plurality
The provision of a speed-increasing gearing for
of lugs 3| Vfor s pporting the nozzle box on the
`gearing I2.
In'order to cool the downstream side of the>
turbine Wheel, a suitable cooling cap may be used,
as shown in Fig. 1.
The details 'of this cooling `
to an understanding of the
dimensions ofthe turbine. My invention par
ticularly relates to an improved arrangement for
lubrication of such gearing.
wheel is secured to a hollow ñanged '
shaft I8 forming a bore I9 by means of a plu
rality of bolts 2B.
e nozzle box has an essentially ring-shaped
for connection
i? are secured to and
integrally formed with the nut' 69. A set of ñuid .
directing vanes 'II is arranged ahead of the auX
iliary impeller blades 69 andV supported on and
secured to the inlet conduit 65. The inner edges
shaped cup 'I2 adjacent th‘e nut 69. Another-*set
includes means for lubri
The gearing l2 also
bearings and gears and means
eating the various
to reduce leakage oí lubricant from the casing Sd
of circumferentially spaced fluid directing Vanes
or nozzle partitions 13 is arranged between theA.
`auxiliary blades 63 and thermain blades 5%.
along the shafts i8 and €525.y The means to re
'E4 held between two rings 'l5
duce leakage along the shaft S3 comprise laby
rinth' type packings H5 and means including
said packing to form a leak-off chamber llt
`of solid matter into the interior of the corn
between the packing lie and the adjacent bear
¿ presser.
ing Iûü for receiving lubricant discharged from
During operation the set of vanes or partitions
the left-hand end of the bearing itil. Another
. "H direct ñuid to be compressed towards _the auX-r
iliary blades 16. ~ The latter impel such fluid in 10 labyrinth type packing Hl is provided to reduce
leakage from the casing ‘Sii along the shaft IE.
axial direction towards the vanes 13 which, in
The packing îil and the adjacent bearing 88
turn, direct th'e ñuid towards the .inlet portions
blades Si. The iluid is im
form another leak-oir chamber H8 for receiving
` of the main impeller
by lcentrifugal. 1 lubricant discharged from the right-'hand end of
pelled by the blades 6i mainly
action and forced radially outward into 'the
the bearing 99.
The space formed by the lowerl portion of the
l scroll Sli.
casing Se between the bearings til@ and QS forms
' Ardiiïuser 19 is provided for converting part of
another chamber i i@ for receiving lubricant from
the velocity energy of the medium impelled Vby
The dif
these bearings and from other elements oi the
. the impeller 63 into pressure energy.
l fuser 'it is located in a central portion of the 20 gearing. in order to assure thorough lubrication
of the Various elements oi the gearing, a pump
sci-c1154 and comprises a >plurality-of'varies 3€)
`wire mesh screen
inlet conduit 65 to reduce access
is secured to the
t0 rings 2li and 82 i
having opposite edges secured
l2iì (Fig. 2) is provided fory conducting oil or lise v
lubricant to the various elements requiring lubri
cant during operation and ythree other pumps
rigidly secured to the casing halves 5l and 52 25 iîéi, §22 and £23 are provided íor'removing-lubri»
‘ circuinierentially
cant from the chambers vl it, lit and iis.
The pump E25 has an inlet i242- connectedby
spaced bolts B3 and fifi respectively. An outer
passages §25, E2@ and i‘ì'i formed in internal and
portion of the compressor casingiorms a ñanged
centered on the two rcasing halves @l and 62
respectively. The rings »or lwalls 8l. and 82 are
opening 85 for dischargingcompressed ymedium
external ribs oí the casing 9@ (Fig. 2) to both
to a consumer such as an internal combustion 30 leak-oí chambers lie and H3. lIt should» be
noted that the passage iìiâ is in front of the '
i2 for driving'the compressor'V
_The gearing
from the turbine and for supporting the’ latter
onA the compressor' comprises-a casing 9e having
three outer arms orbrackets 9! with axial bores
92 for receiving the bolts >84. These bolts project
throughropenings in the aforementionedpbrack
ets 'si oí the nozzle boxfand` are Avrigidly secured
to the brackets »el and the brackets 3l ;by means
of nuts Q3 thus formin'ga rigid support for the
gearingand the nozzle box oni the compressor
VThe ends ofthe casing 9B, .are closedby end
covers'âlá and 9,5 rabbeted to the casing 9G.
The turbine shaft i8 and the compressor shait
68 project through openingsY> in the end covers
95 andrSâ respectively, and adjacent end portions
of the shafts telescope each other. More spe
ciiîcally a> bearing sleeve S5 is- secured in the bore
Eil of the turbine shaft I8 and supportsthe right
hand end portion
of ' the compressor shaft 63. ‘
The left-hand end of >the hollen/‘turbine shaft
i8 issupported on a journal bearing 91 secured
plane of the section represented by> Fig. l,
whereas the other horizontal passages §33 andY
E32 are behind that plane. From a comparison
ci Figs. l and 2 it will be understood that the or” the horizontal passage §25 is vco-n
nected to the pump inlet chamber §24 by the
single vertical passage A25.
The pump i2?. has an inlet l2@ connected by
passages E353', i3d formed in an internal rib of
the casing
to the left-hand part (Fig. l) of
the main chamber HS. The pump G23 has an
inletl I3i connected by passages l32’, §32 to the
Fig. l) oi the
right-hand part (when viewed in
main chamber iis. The provision of two pumps
922 and E23 for. removing oil from opposite ends
of the main chamber H9 is desirable in order
to assure thorough scavenging of this chamber
inthe various positions the gearing may assume'
'when used on an aircraft.
The pump E21) for supplying lubricant to the ‘
various bearings and gears has an inlet |33 con
nected to a supply conduit i3d for receiving lubri
to an inner 'wall' or partition S3 Aof thecasing
cant from a source not shown.
§43. A portion of the turbine >shai‘t I8 nearthe
bearing 99 secured to an inner cylindrical pro
has an outlet §35 connected by suitable channels
(not shown) to the various elements to be lubri
cated. The detail arrangement of these channels
cover 95. Similarly, a portion
of the compresso-r shaft near ’the impeller is sup-p
' ported on a-journal bearing H35 secured to the
is not indicated. in the drawings as it does notY
form a part of the present invention.
ri‘he lubricant removed from the chambers I i6,
bucket wheel i3 is supported by‘anotherjournal
Y jection of the end
end cover 94.
The turbine sh'aît .I8 is provided'with a pinion
or gear le! located between the bearings 91 and
Se .and the compressor shait S8> is provided with ~
a gear H32 arranged between the bearings 91
. and H39.
Torque is transmitted from lthe gear
i9! on the vturbine shaft to thepgear HB2 on the
compressor shaftfby means oran intermediary
The pump E29
H8 and HE bythe scavengingrp'umps §25,` §22’`
and E23 is discharged from said pumps into 'af
drain conduit ist. rthe conduitlßûis connected
to a discharge passage lei vcommunicating di
rectly with the outlets M2 and m3 of the Ypumps
§22 and iìâresp-ectively. The discharge -passage
le! is connected by a passage Me formed inthe
casing @il to the outlet M5 of the pump ¿l2l`.
The four pumps E2C», l2l, i122 and-ltßare of
Vshaft l Q3, with two
E95 secured thereto and meshing with Ithe gears 70 conventional gear type design andv havedriven"l
axially spaced gears 194 and
mi and §52 respectively.
elements or rotors suitably `connected to a corn- ’
The outer ends of the A.intermediary shaft 1&3
are supported by journal bearings m6 and Iû'l,
to the inner wall of the gear
- respectively,` secured
nien drive shaft M5 which latter has-agearv M114’
meshing with agear ißt secured to; in the present =
example integrally
formed with. the shaft H13"A '
and located between the gears |04 and |95 on this
shaft. .The gears |41 and |48 are spiral gears
with their axis of rotation arranged at right
angles to each other.
l Fig. 3 shows the details of the scavenger pump
at the extreme right end of the shaft I 46 in Fig. 2.
This pump consists of gear, |2I", which may be
-pressed or keyed onto an extension |46’ of the
shaft |46, meshing with a second gear |24’ sup
casing, means for transmitting torque `between
the two shafts, the central portion of the casing
forming an oil chamber and end portions of the
casing forming leak-off chambers, means for lu
bricating the gearing comprising a pump driven
from one of the shafts for forcing lubricant into
the gearing and separate scavenging pumps con
nected to the leak-olf chambers and the inter
ported on suitable bearings (not shown) in the
mediate chamber for removing lubricant there
pump housing. As indicated above, oil from pas 10 from.
sage |25 enters the pump inlet chamber |24, is
2. A gearing for aircraft turbosuperchargers
comprising a casing with open end' portions, cov- »
carried by the gear teeth to the discharge cham
ber |45, from whence it goes through passage |44
to the oil-out passage |4|. The gears |2|”, |24’
are separated from the corresponding elements 15
including an intermediate gear shaft supported
of oil supply pump |20 by a plate |2|', which is
arranged to ñt closely the perimeter of the recess ‘
on the casing for connecting the driving and
driven shafts, means including a pump for sup
in the pump housing occupied by the pump gear
plying lubricant to the elements of the gearing,
elements, the plate |2|’ having suitable openings
20 means for removing lubricant from the gearing
through which pass the pump _gear shafts.
comprising a main chamber formed by a central
The above-described oil pump arrangement is
portion of the casing, leak-off chambers formed
representative of the arrangement of the other
gear pumps |29, |22, |23.
by the end covers, scavenging pumping means for
removing lubricant from both> ends of the main
As stated above the end covers 94 andr 95 are
chamber and other scavenging pumping means
rabbeted to the casing 90. `They are rigidly
connected to both leak-on? chambers for remov
secured to the casing by a plurality of circum
ing lubricant therefrom, and means for driving
ferentially spaced studs |49 threaded into the
all of the pumping means from one of said shafts.
end cover 95 and projecting through bores |59
3. A system of lubrication for a gearing having
formed in ribs |5| of the casing V99. The ribs
|5| extend from the inner face of the end cover 30 a housing, shaft and gear means enclosed there
in, leak-off chambers formed at the ends of the
95 to the adjacent inner face of the end cover 94.
housing and a main oil chamber formed by a cen
They act to reinforce the casing and what is
tral portion of the housing, said system compris
more important they reduce leakage of lubricant
along the studs through the openings in the end ‘ ing separate scavenging pump means for remov
' ing oil from the leak-olf chambers and the hous
cover 94. The end cover 94 is securely fastened
to the studs |49 by nuts |52. >
ing respectively, pumping means for supplying lu
The outer lower portion of the gearing’f casing i ' bricant to the gearing, said pumping means hav
ing casings formed at least partly by said hous
90 forms a curved channel |55 which may be con
nected to a conduit or scoop
ing,fand means for driving all of said pumping
under pressure from the slip
means from >one of the shaft means.
stream. Such 'air orr
4. A system for lubricating a gearing having
cooling medium is conducted through the chan
a housing, shaft and gear means enclosed therein
nel |55 and discharged into the space | 51 formed
and detachable end covers for the housing form
between adjacent portions of the gearing casing,
the bucket wheel and the nozzle box. Part of 45 ing supports for the shaft means and leak-oil’
chambers for receiving lubricant leaking along
the cooling medium is forced from the space |51
, the shaft means, a main chamber for lubricant be
through the openings 21 intofthe space formed
ing formed by the housing, a pump for supplying
between the cooling jacket 24, 25 and 26 and the
nozzle box casing 2|'.
lubricant to the shaft and gear means, a scaveng
What I claim as new and desire to secure by 50 ing pump for removing lubricant from the main
chamber, scavenging pump means for removing
Letters Patent of the United States:
lubricant from the leak-off chambers, and means
1. Gearing comprising a casing, two aligned
including a gear shaft adapted ,to be driven from
shafts having end portions overhanging from the
one of the shaft means for driving all of said
casing and other end portions telescoping each
other and supported on a central portion of the
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