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Патент USA US2123057

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July 5, 1938.
l
2,123,057
E. MARTIN
OPPOSITELY ROTATING COAXIAL PROPELLERS
Filed Feb. 29. 1936
3A sheets-sheet i
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INVENTOIL
July 5, 1938.
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,
E. MARTIN
OPPOSITELY „RoTA'TmG 605mm, PÈOPELLERS
Filed Feb. 29. 1936
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3 Sheets-Sheet 2
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2,123,057
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INVENTOR. ì
July 5, 1938.
`
E. MARTIN
'
25123’057
oBPosITELY ROTATING coAXIAL PRoPELLl-:as
Filed Feb. 29_I 1936
_
3 Sheets-Sheet 5
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nv?ENToR.
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ATTORNEY
2,123,057
Patented July `5, 1938
UNITED STATES PATENT oI-‘EicE y
2,123,051
orrosrrELr ao'rA'rlNG ooAxIAL
mornunas
Erle Martin, west Hartford, conn., miglior to
United Aircraft Corporation, East Hartford,
çonn., a corporation of Delaware
Application February 29, 1936, Serial No. 66,392
10 Claims. (Cl. 17o-435.6)
Fig. 4 is a sectional view on the line t-l of
This invention relates to improvements in op
positely rotating coaxial propellers and has par
Fig. 5 is a sectional view on the im@ t-t of
ticular reference `to improvements in mounting, '
driving, and pitch adjusting means `for oppositely
. t rotating coaxial controllable pitch propellers for
airplane propulsion.
Fig. 6 is a side elevational view of the fixed
'cage which carries the reversing pinions.
Fig. 'l is a vertical'sectional view through the
.dn object of the invention resides in the pro
vision of means for securely supporting a pair
of coaxial propellers at one end of a'power‘plant
m such as an internal combustion engine.
.il further object resides in the provision of
suitable means operating in conjunction with the
power plant for driving said propellers in op
posite directions-of rotation about the same axis.
still further object resides in the provision
it of-A.means
in combination with the supporting and
driving means for rotating the propeller blades
to adjust the pitch of the propellers according
thrust bearings which transmit the pitch adjust
ing forces to the propeller blades and
' Fig. 8 is a sectional view of a fragmentary por
peller adjusting force from the' thrust bearings
shown in Fig. 7 to the propeller Vblade roots.
Referring to the drawings in detail, the 15
numeral Ill indicates a power shaft such as the
crankshaft of an internal combustion engine used
for the propulsion of aircraft. The driving end
of this-power shaft idprojects into a nose piece
to predetermined 4operating conditions.
.20
An additional object resides in the provision
. of propeller supporting, driving, and pitch ad
justing means of the character described, having
an extremely light weight and a mechanical em
ciency which incurs the minimum loss of engine
25
power.
_
i
i
-
or gear casing i2 secured upon the forward side
of the engine by suitable means such as the lugs
vlit and cap screws it. -Upcn the forward end
of the driving shaft iii there is secured a bell
housing I8 fixed against relative rotation with
» respect to the shaft.
'
Other objects and advantages will be more
particularly pointed out hereinafter or will be
come apparent as the description proceeds.
In the accompanying drawings in which like
3 ‘ reference
numerals
designate
similar
parts
throughout, there is illustrated a suitable
mechanical embodiment- of what is now con
sidered to be the preferred form of the invention.
The drawings, however, are for the purpose of
35 illustration only and are not to bel taken as limit
ing `the invention, the scope of which is to’be
measured entirely by the scope of the appended
claims.
A
y
‘
In the drawings, Fig. 1 is a. side elevational view
of a pair of oppositely rotating coaxial con~
trollable pitch propellers with supporting, driv
ing, and pitch adjusting means therefor, con
structed according to the idea of this invention,
' certain portions of the construction- being broken
45 away and shown in section to better illustrate
the construction thereof.
Fig. 2 is an elevational view of a sleeve and
piston member constituting an element of pro
50
10
tion of a propeller hub en_ the line d-t of Fig. l
and shows the member which transmits the pro
This bell housing carries
the outer ring gear 2li of` a planetary reduction
gear interposed between the drive shaft i0 and
a .propeller shaft 22 coaxial with the drive shaft.
A cage member 24 is fixed upon the rear end of
the propeller shaft by means of a splined section 30
26 and carries a plurality of planetary gears 28
which mesh with gear teeth provided on the inner
surface of the ring gear 2li and with gear teeth
provided on the outer surface of a fixed inner
gear 30.
`
l.
35
When the driving shaft lll rotates, it rotates
the bell housing I8 and outer ring gear 20. Rota
tion of the ring gear 2li causes the planetary gears
'28 to rotate and revolve about the inner fixed
gear 30 carrying with them the cage 24 which is 40
non-rotatably secured to the end of the -propeller
l shaft 22.
As the number of gear teeth in the
ring gear is much greater than the number of
teeth in the fixed gear, the effect of these two
gears upon the planetary gears rolling between 45
them is to decrease the speed ' at which the
planetary gears revolve around the inner gear
with respect `tothe rate of rotation of the ring
gear so that the cage 24 rotates at a slower rate
peller pitch adjusting mechanism, a. portion of
the member being broken away and shown in
than the ring gear 20 and bell housing. i8, thus
providing a speed reduction between the power
section to bett er illustrate ' the constructionl
lshaft I0 and the propeller shaft 22. This is, in -
thereof.
.
`
Fig. 3 is a sectional view on the line î-ß of
55 Fig. 1.
'
general, a usual and well-known type of planetary
reduction gear, and it is believed that a further Y
description thereof is not necessary for the pur 55
2
2,128,057
pose of this disclosure. Somewhat rearwardly
of the splined portion 28, the propeller shaft is
comprising the inner surfaces of ribs 88 provided
within the gear case, and cap screws 88 extend
provided with a lscrew threaded portion 32 upon ing through an outwardly extending flange 18
which is threaded a nut 84 for retaining the cage provided along one edge of the cage and into
24 in position upon the splined portion 26 in a / the adjacent ends of the internal ribs 88. Axial
manner well-known in the art.
thrust of the beveled gears 52 and spindles 88 is
Forwardly of the splined portion 28, and spaced
transmitted to the anti-friction bearings 68 and
therefrom the propeller'shaft is provided with
82 by means of a shoulder 72 formedon the
another splined portion I8 adjacent to which is>
10 a screw threaded portionV 38, and between the
two splined portions the shaft is provided with a
radially extendingv shoulder or collar _48 for a
purpose which will presently appear.
The propeller shaft extends forwardly from
15 the screw threaded portion 88 and beyond the-
gear casing I2 and carries upon its extreme outer
end a propeller~ 42. lBetween the propeller ‘42
and the gear casing I2 there is a second propeller
44 mounted upon a shaft in the form of a sleeve
20
48, the two propellers 42l and 44 being designed
to rotate about the axis of the shaft 22 in oppo
site directions. 'I'his opposite rotation of the two
propellers is obtained by means of a reversing
transmission disposed between the shafts 22 and
25
46.
.
-
Upon the splined portion“ of the shaft 22
there is secured an annular gear member 48
locked in position upon the splined portion 88 by
means of a nut 88 threaded upon the screw
spindle within the bearing 88 and bearing against
the inner race of the same and a shoulder ‘I4 10
formed upon the ‘inner side of the gear 82 and
bearing against the inner race of the anti-friction
bearing 82.
The annular gear member 48 is provided with
an annular iiange 18 overlying the splined por 15
tion 38 of the shaft 22 and’upon this flange or
skirt there is mounted the inner race of a ball
thrust bearing 18, the outer race of which is
clamped within a bell housing 88 constituting the
skirt portion of the fixed inner gear 38. This 20
inner gear 38 is rigidly secured to the fixed cage
88 by suitable means such as the cap screws 82
and is independently restrained against rotation
by the interlocking splines 84 formed on an out
wardly extending flange -88 of the gear member
and the adjacent annular surface of the fixed '
cage. The annular collar 48 formed on the pro
peller shaft 22 between the splined portions 28
and 38 bears against the inner race of the ball
88. 'I'his annular gear 48 .thrust bearing 18 to restrain the shaft against. 30
meshes with a plurality, in the present construc
axial movement forwardly of the gear casing I2,
tion four, beveled gears 82 which in turn mesh movement in a rearward direction being resisted
with'an annular gear 84 formed upon the rear by the nut 58 which bears against the skirt por
end of the sleeve 48. 'I‘he beveled gears 82 tion 'I8 of the gear 48 upon which the inner race
are mounted to rotate about fixed axes so thatv member is disposed.
35
when rotatedI by the driving gear 48 on the
'I'he sleeve shaft 48 is provided forwardly of
propeller shaft they will rotate -the driven the gear 84 with an annular shoulder 88 which
30 threaded portion
gear , 84 -on the propeller carrying sleeve 48
in a direction opposite to the direction of
rotation of the driving gear 48. -Thus as the
propeller 42 is non-rotatably mounted upon the
propeller shaft 22 so that it will rotate in the
same direction asthé shaft and as rotation of
the shaft 22 in one direction drives the sleeve 48
to ‘which the propeller 44 ls non-_rotatably se
cured in the opposite direction, it will be seen
that upon rotation of the propeller shaft by the
power shaft I8, the two propellers 42 and 44 will
be caused to rotate in oppositedirections with
60 respect to each other.
Each of the beveled gears'82 is iixed upon, or
formed integrally with. a .coaxial bearing spindle
88 mounted in a fixed cage generally indicated
at 58 by means of spaced anti-friction bearings
65 88 and 82, the bearing 82 being preferably dis
posed upon the opposite side of the respective
gear 82 from the associated bearing 88.
The- fixed cage 88, particularlyillustrated in
Fig. 6, is a split'cage formed of two annular mem
bers 8| and“ divided along a plane including
the axes of the spindles 88 so that the spindles
bears against one side of the inner race of a ball
thrust vbearing 98, which inner race is clamped
against the shoulder 88 by a nut 82 threaded upon 40
a screw threaded portion 94formed on the sleeve
so that the inner race is held immovable with re
spect to the sleeve shaft 48. The outer race of
this'ball thrust bearing is immovablysecured in>
the forward end of the gear casing I2 by means
of an annular cylinder 88, the purpose of which
will presently be described, and clamp bolts 88 .
extending through the cylinder and the forward -'
endof the gear casing and secured in position by
nuts |88. Thus the sleeve shaft 48 is restrained
against axial movement with respect to the gear
casing I2. It will be observed that the ball thrust
bearings 18 and 88 are disposed upon opposite
sides of the reversing transmission so that thrust
loads exerted by the transmission gears will be
taken by these thrust bearings and that, at the
same time, the thrust bearings serve the addi
tional purpose of restraining the two propeller
shafts against axial movement with respect to
the gear casing, and thus transmit theforward
thrust developed by the propellers to the gear
casing and in turn to the engine and the vehicle
upon which the engine is mounted.
and associated anti-_friction bearings may be
assembled within the cage, the -two members of
the cage are rigidly secured together in assem
the form of the invention illustrated, each of
bled relation by suitable means such as the bolts theInpropellers
42 and 48 is a controllable pitch 65
84. The member 8| isy formed along one side propeller, that is,
the propeller blades may be raf
thereof with a plurality of outwardly, extending
tated
about
their
axes to alter the
spaced bearing portions 88 and the member 88 is pitch adjustment longitudinal
of the propellers. For this
formed with spaced half bosses 8'! which cooper ` purpose each of the blades is provided with a holn
ate with the bearing portions 88 to form bearing low base portion surrounding. an arm as indicated
caps for the bearings in which the gears 52 are at IUI oi' a driving spider or hub portion H82 and 70
mounted when the two parts oi' the cage and the terminating in an outwardly extending flange |88
gears are assembled. The assembled cage with
bears against an annular thrust bearing
the beveled gears and bearings is fixed in the gear- which
I8@ secured in the end of a two part blade retain.
75 casing I2 by means of an annular bearing portion
ing barrel .I88 by meansv of an inturned flange
is
3 .
2,128,057
lll) so that the propeller may be driven to rotate
The connecting member generally indicated at
-about the axis of the propeller shaft andv at the ‘ |40 with which the four blade adjusting shafts
|34 are operatively associated consists of 'a pair .
same time the blades will be free to rotate about
their own longitudinal axes for pitch changing y of ball thrust bearings |42 and |4t having vtheir
adjustment. The spider arms |||| are formed inner races rigidly secured upon the screw thread
integrally with cylindrical hub' portions ||2 which ed end of a sleeve |46- by means of a pair of op
are rigidly secured upon the propeller driving positely disposed nuts |48 and |50, the outer
races of these ball thrust bearings being provided
shaft against relative rotation with respect there
to, the cylindrical portion of the spider or hub
ic portion |02' constituting a portion of the pro
peller 4t, being secured upon the' sleeve 46 by
. means of _aY set ‘of tapered splines ||4 at the rear
end thereof and a nut lit screw threaded upon
the end of the sleeve 4t and bearing against a
with lugs as indicated at |52 towhich the'blade
rotating shafts |34 are secured. ' Each of the 10
outer bearing members is secured to the two blade
rotating shafts of the adjacent propeller so that
the two propellers may rotate freely, as far as the
connecting member M0 is concerned, ‘with re
spect to each other, and,«at the same time, an
shoulderV lit on the cylindrical portion fof the
axial movement of all of the blade rotating shafts
spider to force the tapered splines ||4 into wedg
ing relation. The cylindrical portion ||2 of the can be obtained by a single operating mechanism.
_ The sleeve |46 is disposed between the propeller
similar spider forming a component part of the
propeller 4t, is similarly secured upon the end of shaft 22 and the propeller carrying sleeve 46 and 20
20 the propeller shaft 22 by means of the tapered extends within the gear casing I2 to a position
splines |20 and the nut it? which bears against Abetween the annular gears 43 and 54; At its
inner end `this sleeve is provided with integral
an annular shoulder IM formed within the cylin
drical portion H2 and forces theïtapered splines ' curved arms lbtparticularly illustrated in Fig. 2
which extend around the annular gear M between
lill into wedging relation.
the planetary gears t8 and are joined at their 25
25 VBearing sleeves `as indicated at |26 are prefer
outer ends to an integral annular ring |56. This
ably interposed between the interiors of the hol
low propeller blades and the corresponding spider ring is‘rigidly secured to an annular piston itt
arms tilt, and these bearing sleeves are provided . reciprocably disposed in the annular cylinder du
with flanges as indicated at ltd which underlie which is secured Yto'the forward end of the gear
.30 the inner ends -of the propeller blades.> Annular
`ring members as indicated at litt are also ap-
plied tothe inner ends o_f the propeller blades
and maintained against rotation with respect to
the blades by suitable interlocking engagement
35 with the periphery of the flanges |28 of the bear
ing sleeves and each of ¿these annular members
is provided inone side thereof with a pocket |32 ‘i
which receives the inner end oi a shaft i384 ex
tending through a suitable aperture lit pro
40 vided ln the corresponding barrel member Idß'
from the exterior of the barrel member into the
pocket i3d within which it is retained by a pivot
pin 'itt so that a movement oi the shaft itt in
an axial direction will rotate the propeller' blade
45 to which it is attached about the longitudinal
axis of the blade.
30
_
From this description, it will be observed that
the admission of hydraulic fluid to the space be
tween the annular piston läd and the closed end
of the annular cylinder @il will move the piston
in the cylinder and slide the sleeve it@ in an 35
axial direction between the drive shafts of the two
casing it by means of the bolts dd.
propellers,-and that this axial sliding oi the sleeve
lt'ß will move the connecting member itil and
the associated blade> turning shafts Hill to adjust'
peller blades are so designedtliat upon draining
oi the hydraulic fluid from the cylinder t6, cen
trifugal forces set up in the blades by the rotation
of the propellers will tend to rotate the blades
about their longitudinal axes to their low pitch
condition.
`
As the form of the invention illustrated uti
lizes two two-blade propellers,4 it will be obvious
40
the pitch angle of the propeller blades. i The’pro
`
"
'
l'll‘he flow of hydraulic fluid to the cylinder t@ is
lcontrolled by 4means of a centrifugal governor itil
that there will be four propeller rotating shafts
'50 extending from the hubs of these propellers. As
illustrated in Fig. l the propellers are lso mount
edl that all four of these shafts project into the
space between the two propellers and are there
mounted upon the gear casing lli' and having a
55 erally indicated _at Mm, >and. particularly illus
a bore |68 provided ‘in one of the cylinder‘clamp
bolts Qt, which bore leadsv to the interior of the
driving connection |62 with one of the spindles 50
tt of the planetary gears ofy the reversing trans
mission. The ñuid may be led to a governor con
trolled valve through a suitable conduit |64 and
connected to a suitable operating mechanism gen- _ from thevalve through a suitable conduit lß'b to
trated in Fig. 7.
l
' «
-
.
` rlî'he relation of the propeller actuating shafts
itt .to each other Ils particularlyy illustrated in
Fig. 5 wherein it is shown that the shafts con
60 nected to the same propeller are disposed-di
ametrically opposite to each other and lie on
` opposite sides of a'plane including the longi
tudinal> axes of the propeller blades and the axis
of thepropeller shafts and that the adjusting
shafts of the two propellers are disposed at 90°
annular cylinder.
Preferably the governor itt y
is provided with a manual control device |10 by
means of which the propellers may be moved to
and retained in eithertheir limiting high pitch 60
or low pitch condition. The numeral |l1| indicates A
a stop cock interposed‘in the hydraulic iluid line
llìß between the governor and the propeller pitch y
controlling mechanism. ` This stop cock is ar--4
ranged to be lmanually controlled from the air
from each other when the two propellers happen ' plane coclrp’t and serves when closed to stop the ,
to be parallel to each other. From this descrip-v flow of hydraulic ñuid toand from the propeller tion it will be seen that a movement of all of thev p‘tch changing mechanism and thus hold the v_
adjusting shafts in the same direction will ro
tate the two opposite blades of the same pro
pellerin opposite directions to increase or de
crease the pitch of the propeller and will rotate
pitch> of the propellers at any desired adjustment.
The blade rotating shafts |34 are preferably
.at the same' time.
tained against axial movement in the lugs |52, to
connected to the connecting member |40 by means
of adjustable connections such as screw threads
< the blades of the'two propellers so that the pitch upon the ends of the shafts and rotatable bush
of both propellers will be increased or decreased - ings |12 screw threaded upon the shafts and re
2,123,057
provide a centering adjustment for the various carrying sleeve and at the same time providing
propeller blades so that they can all be brought to a means for controlling the pitch setting of said
the same original angular adjustment. If de~ controllable pitch propellers. ‘ f
,
sired, a suitable stop means may be provided to
4. In` combination with an engine and a pair
limit the rotation of the blades in both directions. lof controllable pitch propellers located at one
The sleeve member |46 is preferably provided side of said engine, means between said engine
with bearing areas |14 on the exterior thereof and o_ne of said propellers for driving said one
and |16 on the interior thereof formed of a suit
propeller in the same direction as the direction
able lubricating material to reduce the frictional of rotation of said engine, a set of reversing gears
10 _resistance to movement of the sleeve between the
between said engine and said other propeller for 10
two propeller drive shafts.
driving said other propeller in a direction oppo
While there has been illustrated and described lsite to the direction'ofy rotation of said engine,
a particular mechanical embodiment of the idea a gear casing secured to said engine to provide
of the invention, it is to be understood that the a support for said propellers and a cover for
15 invention is not limited to the particular me
said rotation reversing- gears, an axially movable 15
chanical embodiment so illustrated and described, member extending from a position within said
but that such changes in the size, shape, and ar
casing to a position between said propellers, a
rangement of parts may be resorted to as come connection between the outer end of said mem
within the scope of the appended claims.'
ber and said propellers for adjusting the pitch
20
As the invention has now been described so that of said propellers upon axial `movement of said 20
others skilled in the art may clearly understand member, an annular cylinder in said casing, an
the same, what it is desired to secure by Letters annular piston on the inner end of said axially
Patent is as follows:
movable member reciprocable in said cylinder to
1.
The
combination
of
an
engine,
an
engine
moveA said member, and means controlling the
25
power shaft, a propeller shaft driven by said introduction of hydraulic'ñuid into the space be
power shaft, a controllable pitch propeller on said tween said piston` and thel closed end of said
cylinder.
propeller shaft, a sleeve rotatable on said pro
peller shaft, a second controllable pitch propeller
v5. In combination~ with an engine and a pair
carried by said sleeve, means comprising a pair of of controllable pitch propellers located at one
30
oDDQsitely disposed beveled gears and a plurality side of said engine, means between said engine 30
of pinion gears mounted in a `fixed cage for rotat
ing said sleeve in a direction opposite to the di
rection of rotation of said propeller shaft, and
means for adjusting the pitch of said controllable
35 pitch propellers comprising, an axially movable
and one of said propellers for driving said one' '
propeller in the same direction as the direction
of rotation ofl said engine, a reversing gear be
tween said engine and the other of said pro
pellers for driving said other propeller in a di
35
sleeve disposed between said propeller carrying _ rection opposite to the direction of rotation of
sleeve and said propeller shaft and having a con- l said engine, an axially movable member termi
nection at one end to said propellers, the opposite
end of said axially movable sleeve having a con
.nection >extending through said fixed cage and
connected with means for moving the same to
control the pitch setting of said propellers.
2. The combination of an engine, an engine
power shaft, a propeller shaft driven by said power
45 shaft, a controllable pitch propeller on said pro
nating at one end between said propellers, a free
ly rotatable connection between lsaid one end of
said member and the blades of said propellers 40
for adjusting the pitch of said propellers upon
axial movement of said member, an expansible
chamber supported by said engine and operatively
connected to the opposite end of said member
for moving said member to adjust the pitch of
' peller shaft, a sleeve coaxial with said propeller said propellers, and. means for controlling the
shaft, a second controllable pitch propeller car-v introduction of hydraulic fluid into said expansi
ried by said sleeve, means for rotating said sleeve
in a direction opposite to the direction of rotation
of said propeller shaft, and means for adjusting
the pitch of said controllable pitch propellers
comprising, an axially movable bearing sleeve be
tween and in contact with said propeller shaft
and said propeller carrying sleeve, a connection
between one ’end of said axially movable sleeve
and the blades of said propellers, and means con~
nected with the other end of said axially movable
sleeve for moving the same to adjust the pitch
ble chamber.
.
6. In combination with an engine and a pair of
controllable pitch propellers located at one side
of said engine, means between said engine and
one of said propellers for driving said one pro
peller in the same direction as the direction of
rotation of said engine, means between said en
gine and the other of said propellers for reversing
the direction of said,other propeller comprising,
a driving gear, a driven gear, and a pinion gear
between said driving and driven gears, hydrau
lically actuated means for adjusting the pitch
3. The combination of an engine, an engine of both ofv said controllable pitch propellers, and 00
a governor driven by said pinion gear for con
power shaft, a propellerv shaft driven by said j
trolling the action of said hydraulic pitch adjust
power shaft, a controllable pitch propeller on ing
means.
,
'
said propeller shaft, a sleeve rotatable on said
7. In combination with an engine and a pair
propeller shaft, a second controllable pitch pro
peller carried by said sleeve, means for rotating oi’ controllable pitch propellers located at one
side of said engine,~means between said engine
said sleeve in a direction opposite to the direction and
one of said propellers for driving said pro
» of rotation of said propeller shaft, and an axially
peller
in the same direction as the direction oi'
movable sleeve disposed between said propeller rotation
of said engine, means between said en
70 shaft and said propeller carrying sleeve, termi Tgine and the other of said propellers for revers
nating at ‘one end between said propellers and ing the direction of rotation of said other pro 70
operatively connected therewith.‘said sleeve pro
peller comprising a driving gear, a driven gear,
viding a bearing support for said shaft and a a fixed cage between said driving and driven
relatively non-rotatable bearing between the op
gears, a plurality of beveled gears mounted on
positely rotating propeller shaft and propeller said cage and meshing with said drivingy gear
75
of said propeller blades.
»
,
2,123,057.
and said driven gear, imdraulically- actuated
means for adjusting the pitch of both of said
controllable pitch prcpellers, and a governor
driven by one of said beveled gears for control
ling the actuation of said hydraulically actuated
pitch adjusting means. \
'
‘
8. The combination of an engine, an engine
power shaft, a propeller shaft driven by said
9. In combination with an engine _and a con- ‘
trollable’pitch propeller drivenjthereby, a power
transmitting gear unit between said engine and
said propeller, said gear unit including a pair of
beveled gears and a plurality of pinion gears
mounted in a ñxed cage and, meshing with said
beveled gears, means for changing the pitch set
ting of said propeller, and a governor for con
power shaft, a propeller on said propeller shaft,- trolling said pitch changing means driven by one
a. rotatableßleeve concentric with saidlpropeller of said pinion gears. '
10. In combination with an engine and a pair
shaft, a second propeller carried by said sleeve,
gearing between said propeller shaft and said of controllable pitch propellers driven thereby,
means driven by said engine and driving said pro
pellers in opposite directions, said means includ
Vto the first mentioned propeller, a gear case en- » ing a ~pair of beveled gears and a pinion gear 15
closing said gearing, a ñxed cage in said case mounted upon a fixed axle and meshing with
supporting elements of said reversing gearing, a said beveled gears, power. operated means for
propeller carried sleeve to reverse the direction
of rotation of said second propeller with respect
thrust bearing for said propeller shaft carried
by said cage, and a thpist bearing for said sleeve
20 carried by said gear case, said thrust bearings
being disposed upon opposite sides of said reverse
gear whereby said thrust bearings Ä absorb both
the thrust loads of said gearing and the propul
sion thrust loads of said propellers.
changing the pitch setting of said propellers, and
a governor for controlling said power operated
means driven by said pinion gear.
'
ERLE MARTIN.
20
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