US1749307A - Fuel-charging device - Google Patents

Description

March 4, 1930. F. E. AsEL-'nNE 1,749,307

FUEL CHARGING DEVICE Filed Oct. 29, 1924 .20 fuel x ment provided Jwith an orlfce of comparative Patented Mar. 4, 1930 UNITED STATES Emir)v E; AsELTINE, OE DAYTON, OHIO,

PATENT OFFICE v AssIGNoE, EY MEsNE ASSIGNMENTS, To f DELOO PRODUCTS coEI'OEATIoN, OE DAYTON, OHIO, A cOEPOaATION OE DELAWARE EUEL-OHAEGING DEVICE Application tiled October 29, 1924. Serial No. 746,659.

This invention relates to improvements 'in a fuel char ing device fOr-an internal combustion engine. A

It is among the objects Of-the present 1n- 6 vention to automatically vary the quantity of liquid fuel delivered to the carburetor'of an internal combustion engine, in accordance with the engine suction.

vAnother object of the present invention is 10 to provide a liquid fuel metering device of simple structure and design including substantially frictionless, movable elements and 'Y which is adapted to deliver a fuel flow of suliicient capacity at low engine suctions and a flow of greater capacity when the suction of theengine reaches a greater value.

These objects are attained by means of a metering device includinga stationary meterin element having an orice of maximum ow capacity and a iioating metering elelesser fuel flow capacity than the stationary element, -this latter floating element being `adapted normally'to obstruct the stationary "25. element and thus control the quantityof fuel' being delivered to the engine at low suction.

,However, as soon as the suction eective on said -floating kelement becomes sufficient, it

' will be movedfro'rn normal uposition and per- .30 mitthe-functioning of thestationary element thus delivering a greater quantity, of fuel to the engine under this increased suction condition.

. Further Objects' and advantages of the pres- 35 ent invention will 'be apparent from the following description reference being hadto the accompanying drawings7 wherein a preferred `embodiment of one form ofv the present in "fvention is clearly shown.

' In the drawings: c

Fig. l is a sectional view liquid fuel chargingdev'ice combined. with the intake port of one engine cylinder; l

Fig.- 2 is ya detail sectional view of the metering means and conduit of the. charging device; and

Fig. 3 is a transverse line 3-3 of Fig. 2. i

0 lReferring to the drawings, the numeral 20 e designates the" liquid fuel supply devicel section taken through which comprises the casting 2l. including the top plate 22 having a hollow, depending portion 23, termed the conduit hereinafter. The edge of the bowl 24, which forms the fuel reservoir, fits into a circular groove formed in the top plate 22, and is rigidly held in this position by the stud 25 which passes through a central opening in the bottomv of the bowl and screws into the end of the conduit 23, forming a plug for this end of the conduit. A

gasket 26 is interposed between the end of the conduit 23 and the surface of the bowl to pre- \vent leakage at this point.

The liquid fuel line connection is de signated by the numeral 27'and is provided with the well known float-operated control valve not shown in the drawings. The float is des ignated by the dotted lines.

The top plate 22 has a central projecting portion in which is formed the main liquid fuel distributing canal 29 and its two vertical passages 30 and 31.

The diameter of the interior passage ofthe conduit varies. The portion 32 which communicates with the canal 29 is of lesser diameter than the portion 33 which in turn communicates with the interior of the reservoir by means'of the cross passages 34 and 35. Within the portion 33, between the reduced portion 32 and the cross passages 34 and 3 5 there are provided screwV threads lwhich support plug 36 having themetering orice 37. The vmetering orifice37 is of a' predetermined size, sufficient to deliver eol enough fuel for all engine demands. On each 1' side of the element 36 and'concentric with the orifice 37 there is provided a counterbore 38.

Inside the passage 33 between the station` ary metering element 36 and the passage 32 v there'is provided a iioating valve or meter-V showing theing element 39. `This element is constructed of any suitable material, Abeing Of lesser transverse diameter than the passage 33 in order to eliminate frictional contact .therewith and permit thepassage of fuel through the space between the passage wall and the metering` element. It is hollowed out and rounded Offl at its other end to permit this end normally tO fit into and reston the ,peripheral slotted at its one end to provide lightness and col edge of the counterbored portion of the stationary metering element 36 thereby substantially preventing the passage of any fuel, but compelling it to iiow through the longitudi- 5 nallorice 40 formed therein, said orifice being of lesser capacity than that of the stationary element. A

The liquid fuel supply device 2O is secured to the distributing head 45 in any suitable manner, ya gasket 46 being provided between them to prevent leakage at the joint. A chamber 47, open to atmosphere, is formed in the head,45 said chamber having a'series of passages 48 leading therefrom, each of said passages Having -a pipe 49 communicating therewith.v In the present drawings each of the vertical passages 30 and 31 are shown c in communication with' oiie of the passages' 48, the passage 30 by means of the 20 50 and 31 by' means of-passage 51.

The vaporizing or mixing device of the fuel charger is designated by the numeral 55,

passage and comprises a body 56A suitably secured to the intake\port 57 of the engine cylinder 58. A throttle valve 59 is provided in the mixing device adjacent they engine port 57. Within the body 56 there is positioned a Venturi the barrel portion 68. Then the primary mixtue flows through passages 71 and .72 C

enters the groove 61 and passes through passages 62 into the Venturi tube 60 where 1t mingles with the secondary ail'.

The depression in the passage 48 willgcause `liquid fuel to iow from the reservoir 24` through` passages 34 and'35 into the'passage 33 below the stationary metering element 36.

Now, when the suction of the engine is insufficient. tocause the floating valve 39 to be lifted ofi' its seat' on the plug 36, the plug 36 will not function` as a' metering device but as an ordinary fuel passage to the valve element 39 which will act as the metering means under these conditions'. a i

After being metered by the valve element 39 the fuel will flow through passages 33 and 3 2, enter the distributing-.canal 29 and pass into vertical' passages 30-50 and 31-51. v

Theair flowing past the mouth of the pasa sage 50 will pick up the fuel in said passage and carry it through pipe 49 into chamber of barrel 68 through passages71 and 72 into the vgroove i 61. The fuel laden air will pass through passages 62 into the venturl and J unite with the secondary air flow from pas' l tube 60. At the restricted portion of thisV v tube, and formed about its outer periphery is a circumferential groove 61. A plurality of passages 62 provide communication be'- tween this groove and the interior of the tube. A nozzle 63 is provided inthe restricted neck portion of the venturi, one end of the nozzle extending linto the groove `61 ,while the other end extends into the interior of the Venturi tube to approximately its center, An air controlling valve 65 of any suitable typek'is provided Ponvthe body 56 in 4o connection wlth the passage y64 said valve being adapted to control the secondary air feed through the assage 64 in accordance with the suction o the engine.

The groove 61 of the venturi is [in com- A munication with the pipe 49 of the distributing head 45 by means of the fuel connection which comprises Va barrel portion 68l held onto the mixing device by mean'sf'of a stud 49' fits into a projection 70- will cause a secondary air flow through a controlling valve connected with the pas- 0 sage 64, thence through the venturi, pastthe throttle 59 into the primary air enters the chamber 47, flows through the passage 48 where it'jisvmixed with fuel to form a primary mixture, which 55,1iows through plpe 49 and the interior 0f intake port 57. Thev 'al fuel inlet sage 64. The unvaporized particles of the fuel from passage 72 will tend to fill the` 'l groove 61 and when the level of the liquid fuel in the groove attains a' height equal 'to the height ofthe nozzle 63 the secondary air flow -from the passage 64 'will carry offv any excess fuel flowing out of this nozzle during the operation of the engine at comparatively low suctions. c

When the engine suction increases suiciently to lift valve 39 from its `seat on the `metering element 36, functioning of the ele- .1; y l

ment 39 to meter fuel will cease. Under this condition the quantity of the liquid fuel delivered tothe engine will be controlled by the metering element 36 which ashes been l mentioned heretofore is of pacity than the element 39.

While the form of embodiment of thel invention as herein disclosed constitutes a preferred form, it is to -be understood that other forms might be adopted, all coming Withinl 5,

the scope ofthe claims which follow.

What is claimedf/is as follows:

1. A char e forming device for supplying -i l a mixture o fair and liquid fuel to an internall combustion engine comprising: a mix-` ture forming passage having an air inlet and5 thereto, a fuel duct for leading liquid fuel` to said fuel inlet, a main restrictingf'orice in said fuel duct for limiting the.

maximum iiow of fuel therethrough, and a gravity actuated valve adapted to cooperate with saidorifice,

said valve having'anaper# ture therein for limiting the flow 'of fuel e through said fuel duct whenf said,gravity valve is seated, and being of such predetermined weight that it is lifted from its seat by the liquid fuel stream at higher engine suctions.

2. A lcharge forming device for supplying a mixture of air and liquid fuel to an internal combustion engine comprising: a

mixture forming passage having an air inlet e and a fuel inlet thereto, a fuel duct for lead ing liquid fuel to said fuel inlet, a main re-v stricting 'orifice in said duct for limiting the maximum flow 'of fuel therethrough, and a valve in said duct entirely immersed in the liquid fuel therein adapted to cooperate with said orifice at low engine suctions, said valve having an aperture therein for limiting the e flow of fuel through said fuel duct when said valve is'seated7 and being helduponV its seat by such small force that it is lifted from its seat by the liquid fuel stream at higher engine suctions. n I

3. A charge formingdevice for an internal combustion engine comprising a mixturel passage,tfuel and air inlets therefor, a fuel reservoir, a fuel duct connecting the' fuel inlet with said reservoir, a valve in said duct regulating the iiow of fuel therethrou h, said valve having an aperture therein for limiting the flow of fuel through said duct when the valve is in closed position and adapted to be opened by the action of the fuel flowing through said fuel duct on increase in engine suction effective on the fuel inlet.

In testimony 'whereof I hereto aliix my signature.

E. ASELTINE. i

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