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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.