US1788710A - Fuel-feeding device - Google Patents

Description

Jan. r13, 1931.

W.V A. EDWARDS FUEL' FEEDING DEVICE Filed Sept.

wko/A magi-forma 5 fifuelieeding device.- Y Figure 3 is a detail side elevation Patented Jan. i3, 193i WILLIAM A. EDWARDS, or CHICAGO, iLLIivoIsAssIeNoR To siiiwAR'r-WARNR'COR- 1 i roRAfrIoN, or CHICAGO, ILLINoIsA CORPORATION OFVIRGINIA l t yThe purposey of this'invention is to prory :vide an `improvedfuel vfeeding device for supplying an internal combustion engine,

particularly adapted to utilizing the vapor of the fuel `which' under certain conditions is formed in the apparatus for oiisettingr the Figure 1 is adiagra imatic view showing l 15 a Vacuum tank embodying this inventio-nin the position relativel to the intake i andthe carbureter. c

Figure 2 is a vertical axial section ymanifoldV hf this showing f the float stemV connection withthe valve stem. Y Referring to the drawing, the engine in# tak'e manifold is indicated'at X, the carbureterat Y, and entirety at Z.V l

In detail the vacuumv tank comprisesthe v outer or reserve chamber A. and the inner 0r vacuum'"chamber B which is mounted telescopically withinuthe uppergpart ofthe reserve chamber A',tlie construction forthat purpose being that'tlie reserve chamberA Ais closed at the top by cap'memb'er" A1, which is a metal stamping formed with a iange, litting outside the upper end ofthe chamber A, this stamping beingmade to form a cylindrical shouldergz, and said cap having a central aperture indicated at as, for admitl'tingy the ,vacuum chamber,` B, whichV is dif mensioned for yfitting said aperture andhas anl out-turnedflange, 1, lapping the margin of the aperture, a3; andthe chamber, B, is provided with a cap, B1, having adown turned marginal iange, Z210,v fitting outside ofl the outer chamber. Backing gaskets, bf, and,V b5, beinginterposedabovev andV below the flange, b1', screws, serve toy bind the parts togetheraii'ftight 'atjtheir lapping ii'an'ge's.4 Since the outerfcli'amber requires an Vatl mospherevent as hereinafter mentonedvthe acrlalptedl to" holdma strainer, F1. c ,'Atthe centerof said horizontalwebthere, v is. mountedfa ittin`g,"E,I forfconnection with" the pipe, e, le'adiiig fromithe inta-ke'-manii-f fold, said fitting having a restricted; pas-g sage',v20, leadingfto. the suction port which 'the vacuum tankin its Y the cylindrical shoulder, a2', ofthe cap, A1, 4'45 joint betweenfthe body,v A, and cap A?, need withdrawal of 'the inner chamber with the cap, A1, carrying all`operating- .paits, for

any1 attention' which they may require at anyj time'. Inathe horizontal web ofsthefcap,v

B?, there is mounted the fuel'inlet'itting, F, for connection withthe-uel supplypipe, f, Vthe"innerfend of the yitting,"`F ,beingl is" controlled bythesuction valve, H,-and in e2,V et which arrangedy to V seat downwardly'.

kThe specific vconstruction fof thisl fitting" saidttingrtliere is alsov formedfvan atmos-y phereinlet passage, 30, openftotliey atmo's` phere atl 31 *v and leading to `the 'valve seat,V

the atmosphere .va1ve ,"K, is

ber,"E,.and vtwo similar.tublanmembers,

lElandEZ, which projectgfromlthe lower end'` `ofthe `member, E, constitutingV parallelprongsgLTheimember, E, has'f'two longitudinally Vextending parallel bores, e.1, e2, kwhich receive the upper ends of the prong members, E1, E2, which are tubularin forni,

having extendingfthrough them vthe s'iuctiony and atmosphere passages, e3, ve4, jan d being insertedy and made tightfpreferably by drive iitfinfrthe bores, e1 and ei2,linto,which the prong members extendfor a short distance from ,f `the; llower end of said bores, leaving above vtheinan yadequate portion of said bores to constitutey chambers for the suction and atmosphere valvesl- Vand K, of which the atmosphere -valvejseats at'f32fat the upl per'eiid ofztlie'passage, e3, in said prong, El, the suction! valve, -I-, 'seats upwardly at, the

shoulder, *65, 'constituting the valve' seat yformedfbythe reduced upper v'end portion of( the bore, ve2, `from whichlthe duct, y2Q"7 leads to the end oftheittiiig which isy terf Y tally` open hook seen at L2, the horizontally end `of'which'en'ters between the two prongs, l 'El' and E2, yfor guidance ofptheA stem andV Lhaving guide bearings vat, @41, and 631,at the lower endsfof the pro'ngs,'E1 and E2, zfrom which respectivelysaid'stems extend for engagement with the stem, L, of the iioat, M,

as hereinafter more particularly/described. The float, stem,-L, is'lformed at its upper end by, bending in the form of a'horizonfloat vertically. Thee range of vertical movementof the "iioat being such that not only thisV horizontally projecting terminal but also atthe other side of the hook and the vertically extending portion` of the steinv move up' between the twoprongs when the ioat rises toits upper limit.

It will be seen that-.the engagement as indicated of the float stem between lthe prongs, El and E2, is adapted to check the l floatas to its sideward movement only in one plane, and that for its complete guid' ance means vmust be.A provided for checking itin 'a tranverse verticalplane. For that purpose thelower ends ofthe valve stems, L and ic, which for their engagement with the float stemA have theirY lower ends bentv for extendinghorizontal'ly crosswise of the float stem for encounter with the vertically .spaced shoulders'constituting abutments on the iioat stem formed below the rightangled bends at Z2 and` lf2-are formed also fory engagementv with the float stem to Checkit bodily in planes transverse to that in,V which it is checked by said shoulders and between the prongs El .and E2,vthe form for this purpose consisting of closed loops or eyes, it* and 7c?, as may be understood from the drawings. Y

The detail of construction and arrangement ofthe atmosphere and suction valves and the fitting in which they are mounted and their connection with the float for operating, is not a part of the present invention the same being shown and fully described in vthe, pending application# of Leonard H. Wheeler Ser. 131,861 led Aug.

27, 1926, patented Apr. 29, 1930, No. 1,756,- 895. Y Y VFrom the position of the float, M, in the chamber, B, it will *bev understood that VtheV outer reserve chamber in the casing member, A, at the annular portion of the chamber which surrounds the chamber, B, extends substantially higher than the; high liquid level of the vacuum chamber, B, and at the upper end of said annular partof the reserve chamber, A, there is provided an atmosphere `vent indicated at a.

For the speciiic purpose of the present invention, from the upper end of this annular encompassing portion of the reserve chamber which encompassesithe vacuum chamber, connection'ris made by pipe,R, withthe fitting, E, outside the restricted passage, 20, and therefore outside the suction valve, H, vsaid pipe, R, `thus a'ffordinglcommunic'at'ion ofthe 'reserve chamber, A', withithe engine intakemanifold from which suction is derived-for-operating the device for fuel lifting. `In this communicationthere is provided a restriction indicated at r in the fittingby which the pipe'R, is connected with the chamber A; This" restriction has an aperture usually no larger than the restricted passage, 20, through `which the vacuum chamber derives suction from the intake manifold.

The operation understood to bethe usual and well understood operation of a vacuum tank having alternately opening atmosphere and suction of this,` construction may be v valves, namely that as the vacuum chamber is filled by suction from the lower source the rising of the iioat at a predetermined high level of the liquid closes the suction valve and opens the .atmosphere valve permitting the liquid whichhas been lifted by suction into the chambeijB, to be discharged drawn from the vacuum chamber into the intake manifold while Vthe suction valve is open, whereby under some circumstancesthe character ofthe fuel mixture is unfavorably vaffected for running the engine; In the construction herein described, this disturbance of the fuel mixture is odset byv fuel drawn through the pipe, R, from the upper part of the reserve' chamber below the restriction, which is open throughout theventire operation but through which fuel vapor will be drawninto the intake manifold substantily only during the period ofdischarge ofthe fuel'frofm the vacuum chamber into the reserve chamber g' because atthat stage the disturbance of the liquid in the reserve chan ber caused by the discharge into it from the vacuum chamber, causes the vapor to be separated from the liquid in the lower part o f the chamber and rise vto the upper part, occupying the annular 'space at the upper part above the high liquid level, from which it is, drawn into the intake manifold during this part of the cycle, equali'zing and offset- .ting the vapor which is drawn into the inlatter is open.

talze manifold at' the suction`v valve f I claim l l. apparatus for lifting fuel for supplying an internal combustion engine which com'- prises a Vacuum chamber andv a` fuel reserveV` chamberV arranged to derive supply from .they vacuum chamber at intervals during f which .the vacuum chamber is filled sucl' tion, the vacuum chamber having `an atmosphere inlet and a suction connection adapted to extend to a source of suction; a valve controlling, said connection, automatically operating means forV actuating said; valve,

and ay duct affording restricted comr'nunica-v tion 'from the reserve chamber at a point therein rabovethe 'high liquid level thereof to thesuction connection and communicating with the'latter at apoint therein` outward from said suction controlling valve.

u 2. In anapparatus for'lifting fuel' for supplying 'an' internal combustion engine; r.which comprises a vacuum chamber and a fuel reserve jchamberl arranged toA` derive supply from the vacuum chambery at intervals alternating with intervals during which the vacuum chamber is filled by suction, the' u vacuum chamber having an atmospheric let and' a. valve Vcontrolling the same, anda suctionconnection adapted to be extended to a sourceofsuction' and automatic means forY operating said Vvalves to alternatev the access of suction and atmospheric pressure Y to the vacuum chamber, anda duct .aordr ing'restricted communication from the reserve chamber at a point therein 'above the high liquid level thereof to the suction connection and communicating with the latter at apoint therein outward from the suction .ontrolling valve..

3. ln an apparatus for lifting fuel for supplying an internal combustion engine which -comprises a vacuum chamber anda fuel reserve chamber arrangedVV to derive fuel ysupply from the vvacuum chamber at intervals" alternating with intervals during which the vacuum chamber lis filled by suction, the vacuum chamber having an atmosphere inlet and a suctiony connectlon adapt-V ed to extend to a source of suction, a valve controlling said suction connection, means high liquid'level of the vacuum chamber which is in free liquid communication with the lower part of said reserve chamber,

controlled by change ofV level of the fuel in the vacuum chamber for operating said valve, a duct affording restricted communication` from the reserve chamber above ythe high liquid level of the latter to the suction connection and communicating with the latterfata point therein outward from the suction controlling valve, the reserve chamber having apart extending above. the

whereby said duct serves for admitting to 'when ae' thesuctionlsource fuel having vapor which.v 'may beform'edin the reserve chamber.Y

4. In. an apparatus forlifting fuel* for.

pherei-nlet, andl a suction connection; adapte` ed to extend to asource of suction, a valve controlling saidconnection; means controlled 1 by a change of level of fuel in the vacuum VVchamber for operating fsaidrvalve,a duct.

affording restricted'communication fromthe upper parto'f the'r'eservechamber to the* l suctionv connection and communicatingvwith the latter at a' point `outward from'the suc# tion controlling valve, the vacuum chamber being inserted intogthe vupper part of thek reserve Ychamber with space of the latter enl' compassing the vacuum chamber of substantial Width for feeldundelayed rise of' au the liquid fuel. thereunto, said space extending a substantial"distance above the high liquid levelxof the .vacuumjchamber for accumulating vapor ofthe fuelfformed in the reservechamber at a point whence itk may find escapeto the suction source. u

5. An apparatus for-lifting fuel for sup.

plying Van internal combustion engine com-1 prising a' vacuum4 chamber and a fuel reserve chamber varrangedjto vderive supply. j 10u from the vacuum "chamber at intervals be'- `tween periods during which the vacuum 'chamber Vis `filled by suction, the vacuum chamber having an atmosphere inlet and connection with a `source Lof suction, afvalve controlling the .atmosphere` inlet, and automatic means for operating it; and. a duct affording restricted communication between the reserve chamber at apointjtherein above the high liquid level thereofand the suction connection, whereby suction from the source of suction may Voperate tok withdraw fuel vapor from the upper part of thev reserve" chamber `to lthe source of suction. v

' A. EDWARDS.

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