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Патент USA US2406230

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Aug, 20, 1946.
_J. EyLlLYL ~`
Filed sept. 4, 1944
3 Sheets-Sheet 1
` Aug. 20,` 1946.
J. E. LILL .
Filed sept.' 4'.« 1944
s sheets-sheet z
Patented Aug. Z0, 1946
.la-'nies E. Lili,v Los Angeles, Calif., assigner to
Food >llíachinery Corporation, San Jose, Calif.,
a corporation of Delaware
Application september 4, 1944, serial No.
5 Claims.
laying mechanisms to withstanding the shocks
mentioned hereinabove.
This invention relates to power `transmissions
and is particularly useful i' inl driving a drive
sprocket inv a track laying vehicle-.__ n
The manner of accomplishing the foregoing cb~
Track laying mechanisms are employed on com
jects as well as further objects and advantages
will be made manifest in the following descrip
tion taken in connection with the accompanying
mercial tractors and military tanks and amphib~
ians and each of these includes a ñexible endless
track which is trained about front and rear drive
drawings in which: `
and idle sprockets, and aseries of bogie wheels
Fig. 1 is a fragmentary diagrammatic plan View
of an amphibian incorporating a preferred, em~
bodíment oi the track laying mechanism of my
which ride on the lower flight of the track and
thus supptitthe vehicle.
i i
To increase the service performance character
invention, and is partially broken away substan~
tially as indicated by line I-I of Fig. 2 to reveal
istics 0i tractor type military vehicles the nach
ing sprockets in the track` laying mechanisms
the internal construction of said amphibian.
thereof are placed forward to a point where these
Fig. 2 is a side elevational view Vof Fig. 1.
inevitably receive severe shocks due to the vehi 15
cle nosing into dirt embankments, rocks orl other
Fig. 3 is a vertical sectional view of the tracn
tor sprocket drive of my invention taken on the
line 3_3 of Fig. l.
Fig. 4 is a horizontal sectional View on stepped
levels as indicated by the line 4-4 in Fig.
Alï'ig. 5 is _a perspective vien/'showing the main
obstacles in the effort to push these out of the
way or ride over them. In certain vehicles it has
been found advantageous to drive the track >lay
ing mechanisms from the leading' sprockets and a
problem is here introduced of placing the drive
gear housing of the invention. ‘
sprockets far enough forward so that the tracks,
where they pass around the drive sprockets, will
a Referring speciñcally to -the drawings the in
engage and have traction on an embankment or
other obstacle into which the> vehicle is nosing.
It is an object of this invention to provide a
mounting for a tractor drive >sprt'ncket which may
,y u
Assembled upon the sides L2 to extend outward»
lytherefrom are ponto'ons ’2B -each of which has
a front wall 2l, top wall 22, a bottom wall 23,
advanced position to prov1de traction on an ob- l
vention is disclosed‘as inco?pcrated with an am
phibian il! comprising a hlïll l í having sides l2,
arcurved bow i3, a bòttoin ini and a stern plate
1_5.> Provided in the hull H is a pilct’s compart
be mated ai; the _from eric or the traer laying
mechanism and which
_ne set in a sufficiently
stacle as mentioned.
'552,684 v
(ol. isc-9.1)
It is another object of this invention to?pro
a rear wall 24 and an outside wall 25. Mounted
on each of the pòntoons 2D is a Vtrack laying
ing -for the sprocket which will employ the `Inla
land-traction and water-pro ulsion mechanism 3B
which includes aseries of bog'ie wheels 3i which
vide a tractor sprocket drive emb'odying‘a mount;
terial used therein to especial advantage in with~
are »rotatably supported in any prefered manner '
standing shocksirom ramming against obstacles.
on the pontoon ,bottom 23. Each such mecha
In a common type of tractor 'amphibian known
as the “Water Buffalo” the sides offthe hull are
provided with pontoons which lie within `the end
less tracks of the track laying mechanisms. The
rear ends of these pontoons are employed for
mounting the idle sprockets of the track laying
said pontoons.
It is another object of this invention to pro
vide a tractor sprocket drive on which the drive
sprockets in said “Water Bulïalo” may be mount
ed and these sprockets driven "from, 'the ‘front
ends of said pontoons, thereby interposing a rigid
compression structure between the v.front 'and rear
sprocketsof eachv track laying _mechanism which
'endless double chain track 3d whichV is` trained
about the sprockets 32 and 33
and the bogie wheels
mechanisms. Heretofore, the drive sprockets of
these amphibians have been mounted on bell hous
ings extending laterally from the hull ahead of
nism also includes a double idle sprocket 32, and
a double drive sprocket A33, these sprockets being I
located at opposite ends of the hull Il, and an
The double idle "sprocket 32 is rotatable on a
b'ase B which is slideably mounted on the rear
end ofthe pontoon V2l) `(see Fig. ì2) and is shift
able horizontally by a jack "40 to loosen or tighten
the endless track 34.
The `double drive sprocket 33 of this invention
is mounted on the frcnt end of the pontoon 2r]
’so as to provide a continuous compression mem
ber which lies along and on opposite sides of the
’axisi of
thei operational compressive vforces applied
by the track 34 to the two double sprockets >32 and
will greatly increase the capacity of thèse track 55 33,7tending toiorce one vvof >these towards ’the
other. Such compressive ¿forces >include ‘strains
driving of the track or shocks
caused by the
caused by head on collisions with obstacles in
laying mechanisms 30 of the amphibian I0. One
such instance is where propellers are mounted in
these pontoons in the manner and for the pur-=
includes a drive sprocket mounting and driv
ing device 4| which is mounted on the front pon
pose disclosed in the co-pending application ci
James M. Halt, Serial No. 554,989, ñled September
20,The 6| of the power take-off unit 62 sup
toon wall 2|. These devices are reverse dupli
cates of each other so that a description of the
ports bearings |02 and |33 in which is journaled
a shaft |04 carrying a bearing |65 on which’a
left device which follows will suiiice for both.
clutch gear |65 is freely rotatable. Splined on
Y The left device 4| includes a main housing
the shaft |54 is a clutch collar |61 which is shift
able by a yoke |08 into and out of clutching en
the path of the amphibian l0.
To eifect this purpose, my invention preferably
casting 42 having an attachment flange 43 Yby
which the casting 42 Yis secured to the front pon-`
gagement with the gear |66.
toon wall ‘2| as by bolts or rivets. The housing
42 has a top wall 44 anda bottom wall 45 ex
The yoke |68 is
fixed on a slide shaft |69 mounted in the box 6|
and shiftable by a manually controlled lever H6.
tending forwardly from the flange 43` and uniting
with a curved front wall 46. The walls 44, 45
Vand 46 are united integrally by side walls 41
Fixed on the inner end of the shaft |04 so as
to mesh with the bevel gear 96 is a bevel pinion
H5. The box 6| also provides bearings ||6 and
|i1 for a power take-olf shaft ||8 having a pin
which are provided with pairs of axially disposed
" holes 48 and49. 42 also includes a compartment 20 ion ||9 which meshes with the gear |06.
Each device 4| may be lubricated by the splash
The ' housing
system, To effect this and for .inspection pur
56 extending rearwardly from the perimetric
poses, the housing 42 is provided with an oil baf
flange 43'a'nd having an upper wall 6|, a bottom
fle |20 and with plugged ports |2| and |22 through
wall 52 and a rear wall 53 which are connected
by side walls 54, the latter having coaxial open 25 which oil may be introduced and the mechanism
ings 55 therein.
inspected when desired.
The rearrwall 53 is provided with an opening
56. This opening is adapted to receive a neck
With the above description it is believed clear
that each device 4| mounted, as it is, right on
the head end of one of the pontoons I26, provides
a rigid-support for its drive sprocket 33 and re
69 of a'box 6| of a power take-off unit 62. VThe
invention is adapted to be employed with or with
out the unit s2y and when this unit is dispensed
with the opening 56 is covered with a suitable
' sists head-on shocks imposed on the drive sprock
et with forces which are disposed symmetrically
The double drive sprocketl 33, which the device
4| is provided for mounting and driving, com 35 with respect to the axis along which the shocks
are imposed. It is evident that for the amount
prises individual sprockets 65 having splined hub
of material employed in the drive sprocket sup
sleeves 66 which extend into and mesh with an
port4l, this is very much stronger and more able `
to resist such shocks than thefbe'll housing sprock- .
61 by a bolt 66 which also traps bearings 16 be~ 40 et supports in previous use and referred to here
tween the hub 61 and the sprockets 65.
In operating the amphibian Iû the pilot utilizes
Secured to the side walls 41 of the housing
the transmission `|l6>to selectively drive the port
42 so as to close the openings 48 therein and
internally splined >hub 61 of a gear 68.
sprockets 65 are held in assembly with the hub
rigidlyV position the. assembled sprocket 65, gear
and starboard track laying mechanisms 36. Each
wheel 68 and bearing 16, are cover plates 15.1
Secured in the openings 49 by plates 16 isan -
of these mechanisms are driven, of course, by
idle shaft 11 on which is provided a bearing 18
nection withI the pinionïßß so that the latter ro
mounting a countergear wheel 19, the latter
with the gear wheel 18. Fixed to
the outer side wall 54 andr extending into` its
opening 55 is a bearing support cap -60 in which
tates with this shaft. Through this pinion’s
meshing with gear 18, and the latter meshing with
gear 68, the sprocket 33 is rotated.
When lthe devices 4| are employed on amphib
a bearing 8| rests. Fixed to the inner side wall
ians it is, of course, desirable that these be as
light as possible while, at the same time, have
~ 54 so as to extend into the inner opening 55 is a
rotation of its shaft 9| which has a splined con`
the necessary’strength. For this reason I prefer
cap S5 which houses bearings'ßß and 81.
Rotatably mounted in the bearings 3| and 55 to cast the housing 42 of each of these devices ,
from steel. The cover plates 15, the bearing
86 is a sleeve 88 having a pinion gear 89 formed
support caps 8|! .and 85 and the power take-oif
thereon as well as a bevel gear 90. kThe pinion
box 6|, I find may advantageously be made of a
gear 68 meshes with the countergear wheel 19.
The interior of the sleeve 83 is splined and a dif
suitable aluminum alloy. '
ferential drive shaft 9| which is internally splined 60 When the devices 4| have power take-off units
extends into the sleeve 88 in splined driving rela
62 associated therewith, as shown in theV draw
ings, power may be transmitted from the take
tion therewith. The shaft 9| also journals in the
oii shafts ||8 through drive rods |25 to what
bearing 81. A suitable packing ring 92 is pro
vided in the cap 85 about the shaft 9 |.
The shafts 9| of the two mounting and driving
devices 4| connect through universal joints 93
ever mechanisms require driving.
The claims are as follows:
1. In a tractor type vehicle, the combination f
94 and 95 with a selective gear
of: a double tractor drive sprocket having spaced
transmission 96 to which power is delivered
individual sprockets `connected axially by hub
through a drive shaft `91 from an internal ‘com
means; spaced bearings surrounding said hub
means between said individual sprockets; a hous
- and drive rods
bustion motor (not shown).
VThe mechanism already described in detail may
be employed, for mounting and driving the dou
ble drive sprockets 33 without the power `take
This unit 62 is employed whenever
»off unit 62.
it is desired to supply power within the pontoons 15
20 concurrently with the driving lof theïtrack
ing extending between said individual sprockets
and providing-a mounting for said bearings;
means disposed radially outside the periphery of
said double sprocket for rigidly supporting said
housing.; and means extending into said housing ,v
and operatively connected to said hub means for
rotating said double sprocket.
2. In a tractor type vehicle, the combination
of : a double drive sprocket including spaced in
dividual sprockets connected by a hub; a double
idle sprocket comprising spaced individual sprock
ets connected by a hub; a flexible endless track
trained about said double sprockets; bearing
of: a double drive sprocket including spaced in
dividual sprockets and axle means connecting
said individual sprockets together; spaced »bear
ings surrounding said axle means between said
individual sprockets; means lying between said
individual sprockets and extending towards said
bearings from a position disposed radially outside
the periphery of said sprocket for rigidly support- »
means for said hubs; a compression structure dis
posed between said drive sprocket and said idle 10
sprocket and lying on opposite sides of the plane
said axle means between said bearings for rotat
bisecting the space between said individual
ing said double drive sprocket.
sprockets;.means on said compression structure
4. A combination as in claim 3 in which said
extending between said individual sprockets of
axle rotating means includes a gear mounted on
each of said double sprockets and rigidly sup
said axle means between said bearings.
porting the bearing means thereof on said com
5. A combination as in claim 3 in which said
pression structure; and means extending from
drive means comprises a train of gears, one of
said compression structure into the space between
which is mounted on said axle means between said
the bearings of said double drive sprocket for
rotating the latter.
3. In a tractor type vehicle the combination
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