Патент USA US2109783код для вставки
March 1, 1938. c_ G_ A_ ROSEN ENGINE 2,109,783 ' Filed Oct. 14, 1933 g3 - 2 Sheets-Sheet 1 94 INVENTOR. Can G. F). Ros-EN A TTORNEY. March 1,1938. c. G. A. ROSEN 2,109,783 ENGINE Filed Oct. 14, 1953 ‘2 Sheets-Sheet 2 kkw @Q wswE.ww§ w...“.3a -,Q §§ 3O lwlw INVENTOR. :: CARL G. F). Eossw .A_ TTORNE Y. ' Patented Mar. 1, 1938 - 2,109,733 ~ UNITED STATES PATENT OFFICE ~ 2,109,783 ENGINE Carl G. A. Rosen, Oakland, Calif., assignor to Caterpillar Tractor 00., San Leandro, Calif., a corporation of California Application October 14, 1933,,Serial No. 693,595 ' 11 Claims. (61. 123-139) removed therefrom, the relation‘ of certain of the This present invention relates to compression parts eliminating the use of long fuel conduits. The portion of the fuel injection system not dis - ignition and the like engines, and more particu _ larly to the provision of a fuel injection system closed in detail is fully described in my copending s ‘STATEMENT or Invmzrron ‘’ therefor. ' ‘ > ~ It is an object of the invention to provide an efiicient, compact fuel injection system which is readily assembled on the engine or disassembled therefrom. . 10 Another object of the invention is to provide a fuel injection system for compression ignition and the ‘like engines having a plurality of parts adapted to be mounted as a unitary assembly on _ the engine. I Another object of the invention is to provide a fuel ?lter having a plurality of ?ltering ele ments which are easily removed forlcleaning or replacement. , ' Another object of the invention is to provide a application, Serial No. 684,179, ?led August 8, 1933. . > . . Each fuel injection nozzle 4 (Fig. 1A) is con nected by means of conduit III to a fuel injection pump ll (Figs. 1 and 1A) from the discharge end of which, a measured quantity of fuel is forced 10 under pressure into the fuel injection nozzle as sociated therewith. Each nozzle 4 (Fig. 1A) is suitably mounted in cylinder head Sand injects fuel through a single discharge ori?ce into pre I combustion chamber 6 formed therein. Each precombustion chamber 6 communicates through restricted orifices with a main combustion cham ber formed between the bottom wall of head 5 ‘and a piston ‘I in engine block 8. > > Pumps l I (Fig. ,1) are mounted in fuel injectio and the like engines, said system including single pump housing ,9, which is suitably mounted on block 8. All of the pumps contain plungers discharge ori?ce fuel injection nozzles and a two stage ?lter for filtering the fuel supplied thereto. which are actuated in timed relationship ‘by 20 fuel injection system for compression ignition '25 Another object of the invention is to provide a fuel injection system for compression ignition and the like engines, the parts of which are easily accessible for inspection or repair.‘ ' - Other objects will appear as the description progresses. 30 Fig. 1 is a fragmentary side elevation of a com pression ignition engine disclosing the fuel in jection pump housing mounted on the engine block and. the fuel transfer pump and fuel ?lter - Fig. 1A is a schematic view illustrating a part of the fuel injection system. 49 Fig. Fig. Fig. Fig. _ 2 is a section on the line 2-2 in Fig. 1. 3 is a section on the line 3.—3 in Fig. 1. 4 is a section on the line H in Fig. 1. 5 is a detailed view taken on the line 5-5 in Fig. 2. - Fig. 6 is a fragmentary section takenon the line 6-6 in Fig. 5. 45 through the nozzles in accordance with the ?ring order of the cylinders. Each pump is connected by ?tting II to fuel manifold I6 to which fuel is supplied from the tank, by means to be de ' scribed. In actual operation, the entire system is always kept full and solid with fuel. Y DEscarP'noN on Fmunns 35 mounted on the pump housing. means of cams on camshaft l2 to force fuel DESCRIPTION or Macnmrsu Fuel injection system The fuel system is of the solid injection type in which only fuel—not mixed with air—is injected 50 into the-combustion chambers of the engine, in an atomized state by the fuel injection nozzles. The system is designed to preclude air from be coming entrappped with the fuel. The struc ' ture of the system provides a unitary assembly 55 which can be easily assembled on the engineer Means is provldedfor supplying fuel to the fuel injection pump manifold [6 (Fig. 1). In order that the fuel supply shall be' adequate for all demands of the fuel injection pumps, an ex cess quantity of fuel is pumped from a main fuel supply tank, by means of a fuel transfer pump. The excessquantity of'fuel above the require ments of theme] injection pumps, is by-passed ‘back to the fuel tank. In practice, about 10 ‘ times the quantity of fuel necessaryv for- the fuel injection pumps, is handled by the fuel trans _ fer pump. The by-passing of the large excess quantity of fuel back to the maintank, provides a line of least resistance, so that entrained air can leave the pressure system and be by-passed back into the main fuel tank. From the fuel tank (not shown),.fuel flows under‘ a positive head through pipe 2| (Fig. 1) to‘ the suction side of fuel transfer pump 22. Fuel transfer pump 22, which is driven from the pump actu 60 ating camshaft, is of such design'as to with draw always an excess quantity of fuel from the fuel tank and by-pass that excessv quantity through pipe .23v to the fuel tank.‘ From fuel transfer pump 22, a portion of the fuel is formed 55 1 2 2,109,788 through pipe 24 into fuel ?lter 26, which has a formed (Fig? 3) a pair of apertures 63, 64 direct connection with fuel injection pump mani aperture 63 is at the suction side of the pump gears, and the other aperture 64 is at'the dis charge side of the pump gears. Aperture 64 fold l6. ' ' . Fuel transfer pump As described herelnbefore, the fuel transfer pump performs the functions of charging the in dividual fuel injection pumps for each cylinder by providing a constant head of air free fuel, and drives off air entrained in the fuel system 10 by the by-pass of a large volume of excess fuel. The fuel transfer pump is attached outside the injection pump housing to prevent contamina tion of the lubricating oil by fuel'leakage. The fuel transfer pump is driven from the pump actu 15 ating camshaft, the drive shaft therefor extend ing within thefuel injection pump housing. Fuel transfer pump 22 (Figs. 1 and 2) includes base 3| secured to housing 32 by screws 33. Housing 32 terminates at its upper end (Fig. 1) in 20 ?ange 34 engaging corresponding ?ange 36 of _ bracket 31 which extends within and ‘closes, an aperture in fuel pump housing 9. Screws 38 extend through apertures in ?anges 34, 36 and have threaded engagement with said housing 3 25 to secure pump, 22 thereto. The drive connection for the fuel transfer pump is established by the operation of securing the pump to the fuel injection pump housing. Pump drive shaft 4| (Fig. 1) is 'journaled in boss 30 42 in bracket 31 and'boss 43 in housing 132, and has gear 44 secured on the upper end thereof and meshing with gear 46 integral with camshaft l2. When pump 22 and bracket 31 are secured to housing 9 by screws 38, gears 44, 46 are engaged. Sealing means are provided for preventing pas sage of any lubricant from the fuel injection pump housing into the fuel transfer pump, and for preventing passage of any fuel from the trans fer pump into the fuel injection pump housing. 40 Said sealing means includes packings 5|, 52 seat ‘ed in bracket 31 and housing 32, respectively, and engaging shaft 4|. Compression spring 53 is placed between suitable retainers engaging the‘ opposed faces of said packings to maintain said 45 packings in tight engagement with drive shaft 4|. It is to be noted that packings 5|, 52 have , inwardly diverging end surfaces whereby the pressure of spring _53 is appliedmost advanta geously to maintain such engagement. 50 _ It is believed obvious from the foregoing that the above-described construction lends itself readily to assembly and disassembly, and that effective means are provided for sealing the lubri cating and fuel oils from each other. It is to be 55 noted that the operation of securing the bracket to the housing establishes a driving connection between the drive shaft and the camshaft. The transfer» pump proper is mounted in hous ' ing 32 and provides means for supplying a con '60 stant head of air free fuel to the various fuel injection pumps, a large volume of fuel being by-passed and returned to the fuel tank carrying with it any air bubbles entrained in the fuel. Shaft 4| (Fig. 3) carries pump gear 56 meshing 65 with a similar gear on stub‘ shaft 51 ir-pump chamber 58 formed by a recess in the bottom of upper casing part or housing 32, which is closed One (Fig. 2) leads to an end of an upper passage 64A formed in lower part 3|; and said end of passage 64A communicates with a downwardly extending passage 65 also in lower part 3|. Passage 65 in turn communicates'with a lower cross passage 66, formed in the bottom of part43l. Passage 66 10 communicates at its discharge end-with passage 61 which is threaded for connection with pipe 23 (Fig. l), which by-passes the fuel back to the tank. In passage 66 (Fig. 2) is positioned a hand-operated plug valve 68 which has a large 15 aperture 69, whereby passage 66 can be opened and closed. Small aperture 10 invalve 68' at right angles to aperture 69 provides a pressure relief passage when the valve is in closed position. Between pump chamber 58 and passage 66 is 20 mounted a valve (Fig. 2), including _a hollow sleeve ‘II ?tted closely in an end of passage 64A and provided with spaced pairs of upper and lower apertures 12 and 13, respectively. When the pump is not operating but when the fuel in 25 jection system is being primed, as will be herein after explained, aperture 63, at the suction side of the pump gears, allows‘ fuel to ?ow transverse ly through sleeve 1| by means of opposed aper tures ‘l2, and then through passage 14 which com 30 municates with the discharge end of passage 66 and with lower apertures ‘I2. Adjacent the closed end of passage 64A, sleeve ‘H is formed with aper ture 15, which is closed normally by piston valve member 16. When piston 16 is moved to the right 35 as viewed in Fig. 2, fuel ?ows through aperture - ‘l5, apertures 13, around-reduced portion ‘HA of sleeve ‘II, and apertures 12 to passage 14. Ad justing screw 11 is threaded in sleeve ll whereby the pressure exerted by spring 18 on piston 16 is 40 adjusted. Lock nut 13 maintains screw 11 in adjusted position, cover 86 being provided to pre vent tampering with the adjustment. 'In' operation, the fuel transfer pump works as follows: Before the engine is started, hand-open 45 ated valve 68 is turned to place its aperture 63 in communication with passage 66. This allows fuel to ?ow from the tank by gratrity through pipe 2|, to the inlet side of pump chamber 58, down through aperture 63, through upper aperture 12, through passage 65, aperture 64, passage 62, and out of pipe 24 to “the fuel’fllter. During the de scribed ?ow of the fuel, the pump» is not being actuated because the engine is dead. The gravity ?ow of the fuel, before the engine is started, is to insure that the entire system is solid with fuel. Also, the gravity ?ow with valve 68 open, pro vides means for priming the entire system with 60 fuel should any portion thereof be removed for cleaning etc., and then replaced. When it is desired to start the engine, valve 68 is closed, the position shown in Fig. 2. Upon starting of the engine, fuel will be drawn by the pump gears, to the discharge side of the pump, from which the engine-demand stream of fuel by the upper surface of lower casing. part 3|. . will ?ow to the fuel oil ?lter, via passage 62, and Chamber 58 (Fig. 3) communicateswith'aper 70 ture 6| at the suction side of the gears, which is threaded ‘for connection with pipe 2| which leads from the ‘fuel tank. The discharge end of cham pipe 24. Surplus or‘ excess fuel ?ows down through aperture 64 into passage 64A, from which 70 parallel paths of or a divided flow are provided to passage 61 leading to the fuel tank. . One of said parallel paths or separate divisions of ?ow part 32.with pipe 24 connected to fuel ?lter 26v leads through valve aperture 15, sleeve apertures , ber 53 communicates, through passage 62 in upper 75 (Fig. 1).' 2 In the bottom wall of chamber 58 are ' ' 50 across sleeve ‘II, through lower aperture 12, pas sage ‘l4, passage 66, aperture 69, in valve 68, up 13, around sleeve 1|, through lower aperture 12, 2,109,788 passage 14, and passage 88, to passage 81. The second of the parallel paths or divisions of [?ow 3 ‘fuel manifold’ I8 is directly secured. Access is provided to the ?ltering elements by means of leads from the left end of passage 84A‘ (as viewed detachable covers, the lower set of elements be in Fig. 2) through passage 85, andpassage 88, by , ing mounted on one of said covers, which cover means of restricted aperture 18 in valve 88, to also provides‘ communication between. the lower passage 61 to the fuelsupply tank. Also, during and upper compartments. Thus, it is seen that operation of the pump some of the fuel being the ?ltering elements can be installed easily and spumped through aperture 84 on the discharge are readily removable for cleaning or replace- , side of the pump gears and through aperture 15, ment. I 10 will ?ow through aperture 63 on the suction side" ' Filter assembly 26 (Figs. 1 and 2) includes 10 of the pump gears. Spring 18 is set to yield at a ' housing 8| having integral ?ange'82 by means pressure'of approximately 15 pounds to insure a of which screws 83 securethe fuel ?lter to hous constant head of fuel at the fuel injection pumps. ing 9, suitable communicating apertures being Small aperture 18, in valve 68, provides a con stantly open by-pass, to accommodate certain op erating conditions of- the pump. The size of the aperture is sufficiently small so that the desired head of fuel is maintained. The provision of separate or divided paths of ?ow in the by-pass provided as described later. Flange 82 (Fig. 1) 20 line prevents surgesdn the fuel chamber, thereby providing a constant pressure head in the dis engages thrust plate l2Al'on camshaft I2 to lo 15' cate said camshaft in housing 8. Said housing 8| (Fig. 2) is open at the top and has top cover 88 secured thereto by screws 81 to close said opening, a suitable gasket being interposed. Said cover 88 ‘ closes an upper compartment formed between 20 charge line leading to the fuel injection pumps. Thus, it is seen that the fuel transfer pump provides a constant head of air free fuel, driving 25 off air entrained in the fuel by virtue of the ac tion of the pump gears 58 and 51, and because of the provision of the separated passages. These separated passages not only prevent surges but . provide, by enabling a divided ?ow of the excess 30 fuel to the passage I51 and into by-pass pipe 23, a line of least resistance so that entrained air will leave the pressure system and be by-passed back. to the main fuel tank along with the excess fuel. Not only do these separated passages pro 35 vide a line of least resistance for driving off the entrained air, but they eliminate‘ the possibility of turbulent currents existing where a ?ow of fuel encounters resistance and which lsv apt to result in deleterious emulsi?cation‘of the fuel and air. 40 It is to be noted that the above-described con struction provides a mounting of the pump per mitting quick assembly or disassembly thereof on the engine, while providing an effective seal be tween the lubricant for the fuel injection pump 45 drive and the fuel passing through the fuel trans fer pump. , said cover and apertured wall 88. Spaced below wall88, inclined wall 89 is provided to form upper ?ltering compartment 9| and lower ?ltering com partment. 82. Communication between ?ltering compartments BI and 82 is established through 25 cover.93 closing apertures, leading from said com partments and secured to housing 8| by screws 84. Thus, it is seen that the fuel ?lter housing is divided into a plurality of compartments. The ?rst or lowest compartment receives fuel from 30 the transfer pump and has the ?rst stage ?lter ing elements mounted therein; the fuel is trans mitted through the ?rst stage ?ltering elements to the second compartment which receives the partially ?ltered fuel and has the second stage 35 ?ltering elements mounted therein. The third compartment receives the completely ?ltered fuel which has passed through the second stage ?lter ing elements, and has a plurality of outlets lead ing to the- fuel gauge, to a valve for releasing 49 any air entrained in ‘the fuel, andto the fuel manifold, respectively. Compartment 82 (Fig. 2) receives fuel through conduit 24 from the fuel transfer pump and has the primary or ?rst stage ?ltering elements disposed therein, said elements 45 being placed in said compartment when cover 83 is secured to housing 8|. _ A plurality of pri-~ Fuel?lter In internal combustion engines of any type, it is mary ?ltering elements are provided, only one of which is shown, and each ?ltering element 50 desirable that the fuel be ?ltered to remove any includes alternate‘ ?at disks held close together, 50 foreign, matter, but in compression ignition en gines and the like, such as Diesel engines, it is and formed to provide for ingress_ofa fuel at essential that pure fuel be suppliedto the in their edges, and egress of fuelthrough acentral aperture to the second compartment, the open jection pumps and injection nozzlesso that no‘ ing in the "edges of the disks being suf?ciently particles are present in the fuel to injure-the narrow to prevent entrance of foreign particles pumps and nozzles, or to prevent seating of the except ‘of a very small size. Each primary ?lter 65 needles of the fuel injection nozzles.‘ ‘ ' According to the instant invention, a fuel ?lter is provided which has two stages of ?ltering means arranged in series; the ?rst stage is of the 60 non-collapsible type'and removes all relatively large foreign particles from the fuel and pre sents a relatively large ?ltering area, and the second stage removes all the smaller particles and any ?brous matter which may pass through the ing element being formed of disks is non-collaps ible, so that it resists pressure caused by foreign ' ' matter restricting the ?ow of fuel therethrough and causing increased pressure on the walls thereof. The speci?c construction of the disks is illus-‘ trated in Figs. 5 and'6. One type of disk IN is provided with a‘ solid outer edge from which are spaced a plurality of arcuateslots I82. At 65 its center,_disk |8| is provided with a hexag onal aperturer The other type of- disk I83 is glnes to provide a plurality of stages of filteringv shown above disk I8l. Disk l83‘has a plurality elements, as a single stage ?lter would be apt to of recessed portions around its edge formed be become clogged due to the large amount of ' tween a plurality of radial extensions I84, while foreign matter usually present in fuel oils suitable at its center a hexagonal aperture-is provided 70 for use in such engines. The two ?ltering means in the same manner as in disk I8I. It is to be are mounted in vertically disposed compartments noted that thenradii of the recesses formed be: in a housing which provides an end cover for tween extensions I84 coincide with the innerrsidii 75 the fuel injection pump housing and to which the of arcuate slots I82 in disk |8| while the radial 75. ?rst-stage. I have found itvery desirable in [ ?lters for compression ignition and the like en 4 ‘2,109,788 length of extension I04 is equal to the radius of disk IOI. Each extension I04 coincides with a solid portion in disk IOI between adjacent arcu ate slots I02. I ‘ ‘ The hexagonal central apertures enable main taining alternate disks IOI, I03 in their adiusted position by means of hexagonally sectioned sleeve I06. In assembly, the disks are placed alter nately over sleeve I06, after which the ends of edges to a central recess I33, which has com munication with the atmosphere through ?tting I34 as controlled by valve screw ‘I36. Valve I36 is used principally when the fuel system is ?rst installed to permit escape of any air entrained in the fuel. The slanting contour of the bottom face of cover 36 insures recess I33 being the highest point of the ?lter in any tilted position of the engine. Thus no air pockets can occur 10 sleeve I06 (Fig. 2) are ?anged outwardly as at ‘in the ?lter when the fuel injection system is 10 I01, whereby the plurality of disks mounted thereon are permanently retained in place, the ‘ sleeve being of sumcient length to permit sepa 15 ration of the disks for cleaning. Each primary ?lter element or cartridge is mounted on cover 93 (Fig. 2) by means of stud I08 (Fig. 2) threaded in boss I03 of cover 93 and extending through sleeve I06. As seen in Fig. 1, three bosses I03 are provided for mount 20 ing the three primary ?lter elements. Nut III (Fig. 2) threaded on the opposite end- of stud I08 clamps the plurality of disks together be primed with the engine in a tilted position. The third outlet from the upper compartment is through passage I“ (Fig. 4) which has com munication through a plurality of apertures I42 with internal passage I43 in ?tting I44. Fitting 15 vI44 provides a means for securing the fuel'mani-_ fold I6 to the fuel ?lter and passes fuel there from to said fuel manifold. Said ?tting I44 ex- , which are ?ltered out of the fuel. Arcuate slots tends through aperture I46 in boss I" of hous ing BI and has threaded engagement at I43 with 20 fuel manifold I6. Suitable gaskets are interposed between manifold I6, ?tting’- I44, and boss I41. Manifold I6 extends within fuel injection pump housing 3 and has a boss I6A associated with each fuel injection pump, adapted to receive a ?tting I3. Each ?tting I3 serves to secure said manifold to the associated fuel injection pump, being of reduced diameter at I3A to pass fuel I02 with said recessed portions provide a‘passage to said associated pump. tween annular face II 2 of cover 33 and nut III. When clamped in position, the recessed portions in alternate disks I03 (Fig. 6) provide means for ingress of fuel to the ?lter element, the thick ness of disks I03 determining the size particles ‘ From ‘the foregoing description, it is seen that 30 80 through the primary ?lter element so that the partially ?ltered fuel can pass upwardly through the °:fuel ?lter includes two phases of ?ltering the element through passage H3 (Fig. 2), from I elements, the ?rst of which removes larger for eign particles, while the second removes smaller compartment 32 to the second ?ltering compart particles. It is to be noted that the arrange-_ ment 3|. . In the second ?ltering compartment (Fig. 2) , ment of the fuel compartments and ?lter elements provides a path of fuel ?ow which rises at a plurality of secondary ?ltering elements or car \ tridges are mounted. Each of the elements in cludes a cylindrical frame II6 having an annular ?ange III at the top seated in recess II3 formed around an aperture in wall 33. Integral boss H9 disposed centrally at the top of frame H6 and extending upwardly therefrom provides a seat for spring I2I which surrounds said boss and is compressed between boss I20 of top cover 86 and frame II6. Thus, it is seen that the sec ondary ?ltering elements are held in place by the top cover and can be lifted out for cleaning or replacement when the top cover is removed. _ Further, the strength of spring I2l is such that I50 if the ?ltering elements held in place thereby should become completely clogged, the developed pressure will cause said spring to yield whereby the ?ltering elements will act as valves and will be lifted out of recesses H3 to permit a con 65 tinued flow of fuel. This feature insures a con stant fuel supply for the fuel injection pumps. Frame II6 (Fig. 2) is provided longitudinally of its cylindrical portion with elongated slots I22 which provide for ingress of‘ fuel. Slots I22 are all times, provision being made against any air pockets which would permit the entraining of any air in the fuel during operation. It is to be noted that the detachable cover 03 which pro 40 vides a path of ?ow between the primary and the secondary ?ltering compartments also serves to mount the primary ?ltering elements. . The compact arrangement of the fuel transfe pump and‘fuel ?lter on the fuel injection pump 45 housing 0 provides for ready attachment or re moval of these parts as a unit, so that assembly or disassembly thereof is facilitated. It is to be noted also that this construction provides a materially simpli?ed engine block structure, as it is unneces 50 sary to provide means for mounting the various ' elements individually on the block. It is to be noted also that the ?lter is placed on the pressure side of the fuel tr‘ansfer pump, so that the fuel is ?ltered under pressure, and so that only the fuel conducted to the fuel injection pumps is ?ltered. Therefore, I claim as my invention: ' 1. In a compression ignition and the like en gine having a fuel injection system, a unitary as sembly adapted to be connected in said system 60' I23 which is welded to‘said» frame H6 at its ‘and to be mounted as a unit on the engine, said ends as indicated at I24. Filtered fuel which is assembly comprising a fuel injection pump hous admitted within frame II6 through screen‘ I23 ing, a plurality of fuel injection pumps mounted passes upwardly through a plurality of apertures on said housing, a fuel transfer pump mounted 65 I26 (Figs. 2 and 4) formed in the top wall of on said housing exteriorly thereof, a fuel ?lter said frame II6 around boss II3, to the third mounted on said housing exteriorly thereof, and a manifold extending from adjacent said fuel compartment of housing 0|. ?lter along and connected to each of said fuel in- _‘ As stated above, the third compartment is pro vided with three outlets. At one end thereof, 2. In a compression ignition and‘the like engine 70 70 ?tting I3I (Fig. 4) communicates therewith and having an engine block, a housing adapted to -be ' with conduit I32 leading to a suitable fuel pres sure gauge, not shown. The second outlet (Fig. mounted on, said block, a plurality of fuel in-. ~ 2) is provided at the highest portion of the fuel jection pumps mounted on said housing, a cam ?lter for venting any entrained air. The bottom shaft in said housing for operating said pumps, 76 face of cover 36 converges upwardly from the a fuel transfer pump for supplying fuel to said‘ 75: covered by cylindrical extremely ?ne__mesh screen jection pumps. - _ a - 5 2,109,783 fuel injection pumps, said fuel transfer pump comprising a casing detachably secured to said gine having an engine block, a fuel injection housing and a drive shaft mounted in said cas block, a fuel ?lter secured to one face of said ing and having operative engagement with said housing, a fuel transfer pump secured to an other face of said housing, and a conduit con nection between said transfer pump and said fuel camshaft, a fuel ?lter detachably secured to said housing, and a fuel manifold secured to said ?lter and connected to each of said fuel injection pumps. - 3. In a compression ignition and the like engine 10 having a fuel injection system, a unitary as sembly adapted to be connected in said system and to be mounted as a unit on the engine, said assembly comprising a fuel injection pump hous ing, a plurality of fuel injection pumps mounted 15 on said housing, a fuel transfer pump mounted on said housing exteriorly thereof, and a fuel ?lter mounted on said housing exteriorly there of, said fuel transfer pump being adapted to supply a constant head of ?ltered fuel'to said 20 fuel injection pumps. 4. In a compression ignition and the like engine having an engine block, a housing adapted to‘ be mounted on said block, a plurality of fuel» injec tion pumps mounted on said housing, a cam 25 shaft in said housing for operating said pumps, - a fuel transfer pump for supplying fuel to said fuel injection pumps, said fuel transfer pump comprising a casing detachably secured to said housing exteriorly thereof and a drive shaft 30 mounted in said casing, extending into said hous pump housing adapted to be mounted on said ?lter. . , 1 8. In a compression ignition and the like en gine having/ an engine block, a fuel injection pump housing adapted to be mounted on said ' block, a plurality of fuel injection pumps in said ' housing, a fuel ?lter secured to one face of said housing, a manifold connected to each of said fuel injection pumps for conducting fuel from said ?lter to said fuel injection pumps, a fuel 15 transfer pump secured to another face of said housing, and a conduit connection between said _ transfer pump and said fuel ?lter. 9. In a compression ignition and the like en gine having an engine block, a housing adapted to be mounted on said block, a plurality of fuel injection pumps mounted ‘on said housing, a fuel ?lter mounted on said housing, a ‘manifold’ con nected to each of said fuel injection pumps for conducting fuel from said ?lter to said injection pumps, the connections from said manifold to said injection pumps being higher than the con nection from said ?lter to said manifold, a fuel transfer pump mounted on said housing, and a conduit connection extending upwardly from said ‘’ ing and having operative engagement with said transfer ‘pump to said ?lter. camshaft. fuel injection pumps, said fuel ?lter having a wall portion thereof adjacent said housing wall for maintaining said camshaft in axial position gine, a. fuel injection assembly adapted to be attached to said engine comprising a fuel injec in said housing. tion pump housing having means for detachable housing adjacent an end of said camshaft, and a fuel manifold secured to said ?lter and to said ' 6. In a fuel injection system, a fuel injection pump housing having a plurality of fuel injection pumps mounted therein, said housing having an opening in one wall thereof, a fuel ?lter compris ing a casing closing said opening, and a fuel 50 manifold extending from within said fuel ?lter through said opening and into said housing, means securing said manifold to said ?lter, and means securing said manifold to each of said fuel injection pumps. 55 gine, a fuel injection assembly adapted to be at tached to said'engine comprising a fuel injection pump housing for mounting on said engine and containing a plurality of fuel injection pumps, a fuel transfer pump for supplying fuel from a source to said fuel injection pumps and mounted on said housing exteriorly thereof, and a fuel ?lter mounted on said housing exteriorly thereof. 4 0 11. In a compression ignition and the like en a fuel ?lter detachably secured to a wall of said 45 ' 10. In a compression ignition and the like en . 5. In a compression ignition and the like engine having an engine block, a housing adapted to be 35 mounted on said block, a plurality of fuel injec tion pumps mounted in, said housing, a cam shaft in said housing for operating said pumps, 40 SI connection to said engine and containing a plu 45 rality of fuel injection pumps, a fuel transfer pump for supplying fuel from a source to said fuel injection pumps and detachably mounted on said housing exteriorly thereof, a fuel ?lter de tachably mounted on said housing exteriorly thereof, and detachable conduit connections be tween said transfer pump and said fuel ?lter and between said fuel ?lter and said fuel injection pumps. '7. In a compression ignition ‘and'the like en- . . I CARL G. A. ROSEN. 55.