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Патент USA US2405549

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Aug. 13, 194,6.
'
w. o. BECHMAN ET AL
2,405,549
FINAL DRIVE STRUCTURE FOR CRAWLER TRAcToRs
`
Filed June 26, 1944
2 Sheets-Sheet l
'
Aug. 13, 1946.
w. o. BECHMAN ET AL.
2,405,549
FINAL DRIVE STRUCTURE FOR CRAWLER TRACTOBS
Filed June 26,
1944
y v
2 SheetS-Sheet'îè
»
Patented Aug. 13, 1946
2,405,549
UNITED STATES PATENT GFFICE
2,405,549
FINAL BREVE STRUCTURE FOR CRAWLER
TRACTORS
William 0. Bechman, Harry A. Land, and Russel
D. Acton, Chicago, ill., assignors to Interna
tional Harvester Company, a corporation of
New `lersey
Application June 26, 1944, Serial No. 542,142
3 Claims. (Cl. ’i4-606)
1
2
for a crawler tractor and more particularly re
for the manipulation of such shafting, pursuant
to removal of the clutch, without attendant leak
lates to a multi-compartment frame housing of
the tractor together with journaled supporting
age oi lubricant into the clutch compartment.
A further object is the provision of a driving
means therein for a steering clutch, and drive and
driven members for the clutch which are detach
ably associated therewith in such a manner that
assembly according to the preceding object,
This invention has to do with a drive structure
wherein one of the shafts is axially movable from
the clutch after its disconnection therefrom to
provide necessary clearance for removal of the
the clutch @an be relatively easily installed and
removed in a clutch receiving compartment of
clutch.
Still a further object is the provision of a novel
the frame housing without the necessity of remov 10
tubular driving member journaled upon opposite
ing or detaching unassociated parts.
walls of one of the lubricant-containing compart
Attention is invited to U. S. Patent No, 2,197,289
ments, sealing means cooperable with said tubular
to D. B. Baker et al., which shows a track drive
member for preventing accidental leakage of the
for a crawler tractor wherein the design is such
lubricant through shaft openings in each of said
that the steering clutches can be removed from
their housing compartments in a manner mini
walls, and wherein the driving shafts for clutches
upon either side of said compartment project
mizing the number of operations and time with
through said openings into axially adjustable
respect to what had been required theretofore,
driving relation with the tubular member to fa
but the present invention makes it possible to fur
ther diminish the time and effort required in the 20 cilitate axial movement of each of said shafts
away from its respective clutch after detachment
removal, repair, and reinstallation of a clutch.
Attention is also directed to copending applica.
therefrom, to p-rovide the aforesaid clearance
which facilitates the clutch removal.
tions Serial Nos. 542,143, 542,144, and 542,i<l5, all
These and other desirable objects inherent in
filed June 26, 1944, assigned to the assignee of
the present application and claiming subject mat
25 and encompassed by the invention will be better
In conventional track-laying tractors, steering
is accomplished by the interruption of the driving
understood after reading the following descrip
tion with reference to the accompanying two
sheets of drawings, wherein:
force to one of the vehicle tracks. Interruption
Fig. 1 is a horizontal sectional view taken
ter herein shown but not claimed.
of the driving force is brought about selectivel)T 30 through the rear portion of the body or frame
housing of a crawler tractor, showing a center
to either of the tracks by the opening of a steer
ing (and power transmitting) clutch which is in
terposed in the power delivery train leading
spectively thereto. in larger tractors the steer
gear compartment, a clutch compartment, and a
no be disturbed when the clutch is withdrawn or
change speed transmission gear compartment I3,
portion of a final drive compartment;
Fig. 2 is a vertical sectional view of the appara
ing clutches are the multiple disk type and are 35 tus shown in Fig. l, but with the clutch viewed in
elevation and illustrated in a partly removed po
both large and heavy, requiring a hoist for their
support during an installation or removal opera
sition; and
Fig. 3 is a sectional View taken on the line 3--3
tion. Moreover, the severe service to which the
of Fig. 2.
tractors are subjected makes it necessary for the
frequent service of the clutches. It is desirable, 40 With continued reference to the drawings, the
rear body of the tractor, which may be considered
therefore, to provide a clutch installation which
as the tractor frame and also as a housing for the
will minimize the task of removing and reassem
power transmission mechanism, is shown only
bling the clutches and this invention accomplishes
suñiciently to disclose the relation of such mech
such object by so constructing the power trans
mitting element-s and the parts of the tractor 45 anism to a power input shaft It and a power out
put shaft ll. The frame housing l2 includes a
collateral thereto that these collateral parts need
wherein gearing (not shown) determines the
installed.
speed and direction that the input shaft lil is
Another object is the provision in a frame hous
ing for a crawler tractor of a. lubricant-free clutch 50 driven with respect to the vehicle engine. There
is also provided in the frame housing l2 a gear
compartment between lubricant-containing com
compartment it, clutch compartments l5 on op
partments,
power transmitting shafting ex
posite sides of said gear compartment and ñnal
tending from a clutch in the clutch compartment
drive compartments iS (only one being shown)
into the lubricant-containing compartments in
outwardly of the clutch compartments l5. A tail
conjunction with sealing means which provides
3
wall I'I separates each of the compartments I5
an end wall 56 at its outer or right' end which con-j
from its associated final drive housing I6, and a e
tains coaxial seats 51 and 58 respectively for theV
head wall I8 separates the gear compartment I4
outer periphery of flange 59 on the clutch-driven
shaft I I and for a ball bearing unit 6I which
from each of the clutch compartments I5.
"
Power from‘the input shaft I9 is transmitted
pilots the hub 39 ofthe clutch driving member in
through a pinion gear I 9 formed integrally there
said endV wall 55. An opening 62 coaxial with the
shoulder 58 is sufliciently larger than the portion
with to a bevel gear 2l and Athence to a tubular
driving member 22, having a flange 23 to which
of the hub 39 therein to accommodate an oil seal
the gear 2| is secured by bolts 24. At the driving
member 63 between these parts. Attachment of
member 22, the power may be divided and trans 10 the driven drum end wall 53 to the clutch-driven
shaft I I is accomplished by means of'cap-screws
mitted in opposite directions through shafts 25
54 vdistributed circumferentially about the end
and 25a, each of which is splined internally to the
tubular driving member 22 as indicated at 26.V
wall and turned into suitable holes near the edgeV
From the vshaft 25, the power is transmitted
of therllange 59. l
f
through a steering clutch 2'! to the output shaft 15
A ball bearing unit 65 for journaling the driven
I I when said clutch is closed. Additional gearing
`shaft Il has its outer race centered with respect
to the compartment wall opening 29 by a center
(not shown) in the lubricantgcontaining com
partment I6 is utilized for further speed reduc- Y e ing plate 66 íltted intoY such opening and having
tion before the power is applied to a driving
a shoulder 8'! for said bearing unit. A second
sprocket for the endless track of the'tractor. .A 20 shoulder E8 in the centering plate receives an oil
similar arrangement (not shown) is employed be
seal device 69 which acts with the driven shaft in
tween the shaft 25a and an'endless track at the
preventing leakage of Vlubricant from the ñnal
opposite side of the tractor.
'
drive compartment I6 into the lubricant-free '
Each of the compartment separating walls I 8
compartment I5, through the oversizeshaft re
contains a large opening 28 which is accurately 25 ceiving opening 'Il in said centering plate. AV
centered with openings 29 in the walls I 'I of which
standard means 'l2A is employed for holding the "
but one is shown. Openings 28 carry and center
inner race of the ball bearing unit 65 upon a shaft
bearing supporting plates 3|- Each plate 3l, se
section 13 and against a shaft shoulder T4,
cured _to its wall I8 by cap-screws 39, contains an
Normally, as explained hereinabove, the large
opening 32 for accommodating and which is 30 coiled spring 44 in the clutch maintains the
slightly oversize with respect to the shaft 25 or
clutch engaged while acting against the hub of
25”'. Roller bearing units 33 are carried upon
the driving drum 36 and pressing the spring cup
shoulders 34 in the plates 3I for rotatably sup
45 to the left together with the pressure plate 43,
porting the tubular driving member 22 ccaxially
whereby the alternately arranged driving and
with the openings 28 in the compartment sepa 35 driven friction/rings 38 and 55 are pressed to
rating walls. The bearing units 33 are lubricated
gether in stackedrelation against a reaction plate
by lubricant contained within the gear compart
41 secured to the left end of the driving drum,
ment I4 and some of this lubricant passes between
'Thus rotative force from the'clutch driving shaft .
the rollers of such units, but is prevented from
25 is transmitted from the driving drum 3BA
leaking into the clutch compartments I5 by an 40 through the plates 38 arid V55 to the driven drum
nular oil seal devices 35 of any conventional
54 Vand thence through the driven shaft flange
structure. These oil seal devices 35, therefore;
59 to said driven shaft.Y Release Aof the clutch is
cooperate with the tubulal` driving member 22 in
effected by manual movement of a throwo-ut bear
preventing the leakage .of the lubricant from the
ing unit 15, >to the left of theclutch, to the right Y
gear compartment I4 outwardly of this com
whereby stems 15 are pressed'ragainst the spring
partment through the wall plate openings 32. '
retainingscup 45 to force it, and 'the pressureplate`
The clutch 2l, which may be removed from the43 to the right incident to compressing the spring.
housing I5 as a unit is thoroughly described in the
` In braking the vehic1e,'brake bands ‘I‘I of any
aforesaid application, Serial No. 542,143, so that
conventional structure may beV applied to the outer
a brief description thereof here will suillce. The
periphery of the clutch driven drums 54, and also
driving part of said clutch includes an inner drum
33 onl which there are formed exterior axially
extending ribs 3'I which fit into notches (not
shown) within the inner peripheries of a'series
of friction drive disks 38. A hub 39 for the drum
35 is connected therewith by spoke-like radiating
portions 4I, the space between the radiating por
tions 4I Yaccommodating radiating portions 42 of
the brake bands may be applied to the clutch
drums 54 selectively to obtain orfacilitate steer
ing of the vehicle in the conventional manner.
When it is desired to remove one of therclutches`
1 Y2'! to service the same as by the replacementof
the friction rings 38 and 55, the mechanic will
gain access to the heads of the cap-screws52 and
„64 through a casing opening 'I8 of Fig. 2 and un
screw these cap-screws respectively from the left
a pressure plate 43. A coiled spring 44 which
tends to maintain the clutch engaged reacts be
tween a portion of the hub 39 and the left end of 60 end ofthe clutchl driving drum 36 and from the
a spring cup 45 of which the base is connected to
plate 59 on the left end of the clutch driven shaft f
the pressure plate 43 by cap-screws 46.. A reac
tion plate 41 at the left end of the friction rings
in the clutch driven drum 54 in radia1 registry
trated in Fig, 3.
'
driving and driven shaft flanges or plates 5I and ‘
Axial circumferentially spaced ribs 53, on an
59, as illustrated in Fig. 2, so that the clutch can
be lifted bodily and unitarily from its compart- ,
ment I5. During these manipulations of the ^
II. lOpenings 'I9 (Figs. l and 2) are provided
with the cap-screws 64 soïthat the heads of the
is secured to the left end of the driving drum 35 '
by a plurality of circumferentially spaced Cap 65 cap-screws are accessible to a wrench. Subse
quent tothe removal of the cap-screws 52 and
screws 48 which are anchored in radially’in
84, and the attachment o-f a hoist to the clutch'Z'I,
wardly projecting bosses 49 on said drum 36. Al
thehshaft 25 will be forced to the left, as viewed
ternate of the circumferentially spaced bosses 49
in Fig, 2, into abutment with the right end of the
are secured to an enlarged 'flanged end 5I of the
shaft 25 by cap-screws 52. This is clearly illus 70 shaft 25’3L so as to provide clearance between the
Y
outer drum 54 of the clutch,y are received in s,
notches (not shown) in the outer periphery of fric
tion driven diskrings 55. The driven drum 54 has 75 clutch’ 2l, the oil seal device 69 will prevent the
2,405,549
6
5
open-ended tubular member extending across the
leakage of lubricant from the final drive compart
ment IE into the lubricant-free clutch compart
ment I5 and the sealing devices 35 at opposite
ends of the tubular driving member 22 together
with such tubular member will prevent leakage of
lubricant fro-m the gear compartment hi into the
clutch compartments. A similar procedure is
followed for removing the clutch 2'.’ (not shown)
in the left clutch compartment l5, but, of course,
in that procedure the shaft 25a will be moved to
the right to abut within the shaft 25 for provid
ing the necessary clearance which facilitates re
moval of the clutch.
Having thus described a preferred embodiment
of the invention with the view of clearly illus
trating the same, I claim:
l. In a Vehicle power transmitting apparatus
lubricant-containing compartment in journaled
relation with said bearings and driven from said
gearing, a clutch driving shaft detachably driv
ingly connected with said clutch and having a
splined portion extending endwise from the clutch
into telesc-opic meshed relation with the internally
splined tubular member and through said wall
opening, the telescopic relation of said shaft and
tubular member facilitating endwise movement of
the shaft from the clutch when detached there
from to provide clearance for removal of the
clutch from its compartment transversely of said
shaft, and sealing means between the tubular
driving member and each of said walls to coop
erate with said driving member in preventing
leakage of lubricant from the gear compartment
through said wall opening into the clutch com
employing a lubricant-free clutch for transmit
ting power from a lubricatedI gearing; the co.. -
partment.
bination of a vehicle frame housing comprising a 20
3. In a vehicle power transmitting apparatus
employing lubricant-free clutches for transmit
lubricant-containing compartment for said gear
ing and an adjacent lubricant-dry clutch com
partment for said clutch, said gear compartment
including opposite walls of which one separates
ting power from a lubricated gearing; the com
bination of a vehicle frame housing comprising a
said compartments and contains a drive shaft ~
opening, a tubular` driving member journaled in
the gear compartment in axial registration with
said wall opening and rotatively drivable by said
gearing, a clutch driving shaft having a portion
ments, said walls containing respective coaxially
registering openings communicating with the
clutch compartments, coaxial bearings respec
telescopically in said tubular member and con
strained for rotation therewith, said shaft having
a second portion projecting endwise from the tu
bulai` member and through said wal1 opening into
detachable driving connection with said clutch to
facilitate endwise retraction of the detached shaft I
from the clutch pursuant to projection of the one
portion of the shaft further into said tubular
member and thereby providing clearance for re
moval of the clutch from the clutch compartment
transversely of said shaft, and sealing means be
tween the tubular driving member and each of
said walls to cooperate with said driving member
in preventing leakage of lubricant from the gear
compartment through said wall opening into the
clutch compartment.
lubricant-containing gear compartment for said
gearing, lubricant-free clutch compartments on
opposite sides of said gear compartment and op
posite gear compartment walls separating the
gear compartment from said clutch compart
tively on said walls in axial registry with said
openings, an open-ended tubular gear-driven
driving member journaled in said bearings, said
member extending across the gearing compart
ment in axial registry with said wall openings and
being driven b_y said gearing, clutch driving shafts
having outer end portions respectively detachably
connected with said clutches and inner end por
tions projecting inwardly of said tubular driving
member at its ends but spaced axially from one
another so either can move endwise when de
tached from its clutch and thereby provide clear
ance for removal of its associated clutch trans
45 versely thereof, means causing the shafts to ro
2. In a vehicle power transmitting apparatus
employing a lubricant-free clutch for transmit
ting power from a lubricated gearing; the com
bination of a vehicle frame housing comprising
a lubricant-containing compartment for said 50
gearing and an adjacent lubricant-dry clutch
compartment for said clutch, said gear compart
ment including opposite walls of which one sep
tate with said tubular member while accommo
dating said endwise movement, and sealing means
between said tubular member and each of said
walls to cooperate with said member in preventing
leakage of lubricant from the gear compartment
through said wall openings into the clutch com
partments irrespective of clearance between said
shafts and said Wall openings.
arates said compartments and contains a drive
shaft opening, coaxially arranged bearings re
spectively on said compartment walls in axial reg
istry with said wall opening, an internally splined
55
WILLIAM O_ BECHMAN.
HARRY A. LAND.
RUSSEL D. ACTON.
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