US1941862A - Carburetor - Google Patents

Description

F. H. HEITGER Jan. 2, 1934.

CARBURETOR Filed sept. 25. 1929 2 Sheets-Sheet 2 Patented Jan- 2, 1934 Y cnnnuanron v t Frank H.;Heitger,-F1inf, Mich.; Mattie G. Heit- -ger, Flint,A Mich., administratrix of saidv Frank Application 'september 25, 1329;

This invention relates to 'certain new and useful improvements in charge forming means for internal combustion engines and more particularly tothat type of 'charge forming means in 6 which an `idling passage extends from a nozzle orfuel feeding means and. terminates posterior of the throttle, the object being to provide thermostatically controlled means for controlling theV Vadmission of air to the idling passage and is a continuation of my application le'd August 15,

1929, Serial Number 386,174. l

Another object of my invention is to provide a riser with an idling passage in communication' with the structed of the charge forming and feeding means thatv idling passage of the carburetor so conand mounted in respect to the Vthrottle the idling fuel mixture will. be heated and de# livered posterior of the throttle.`f Inthisfform of feeding means wherea riser is used, it is the'` practice Vto place the throttle in the""riseri above the carburetor and my inventiongis particularlytouse what is known inthe art as .a

adapted plain tube carburetor'- and to use such 'a carburetor provsion must bemade to get sumcent suction on a fuel jet for lowest idling` speed or lowest speed light load and to accomplish this result the suction must be rfrom posterior of the throttle and the idling feed must be arranged to discharge posterior of the throttle and in order toproduee a satisfactory charge formingrand feeding means provisionsinustV be made toraugment or ktoadd to the idlingffeed as the throttle begins to open and before the main fuelfeed startsandr 41 have provided means forv accomplishing this result. I am aware that I am not the first in the art Vtousea heated riserin connection with a car.-` buretor of what is known as the air valve type, but my inventionrelatestoa new conribinati'on"n ,Y of plain tube carburetcr,ris er "and idling passage soconstructed that the idlinggfeedproduced in terior of the engine will runat the various speeds and a sufficient fuel mixture will beY delivered' tothe my particular construction Vof idlingfeed, Iam able to heat'the idling mixturej'and .to thermoi ducing the richness "of Ythe mixture`-jas theheat Aof startingY position.

Other `ofcold motor with" throttle in idling bottomfportionfljand reservoir 6 is 'provided with the carburetor can be'carried and delivered pos-'1 the throttle and vin such a 'manner that g,

. Figure 1 is a vertical section of achargezform` 'soif ing' and feeding means constructed in accordanceV with my invention showing the same connected to the intake'and exhaust of "an internal cornbustion'engine';y Y Y Y ,'Figure2 Vis a horizontal section taken on line 2 2 ofFigure 1; Y j -v Yl'igure 3 is a detail side elevation partly in, section showing' thethermostaticY controlffor the air inlet tothe idling passage; and Y Figure 4 is a detail vertical the accelerating well, Y y A In the Yembodiment, of my invention as' shown 1 indicates' the body of what is' known as a plain tube carburetor `.(one without air valves), said body' having af, carbureting. passage V,extending L75 therethrough to provide an airinlet 2 `having f the usual chokervalve B'mounted therein Vfor con'- trolling *thej admission Vof air. The body isprovided'with a movable bottom portion ,4f secured Y i wherethe bottom is formed of aseparatepiece,

I provide the bottomgwith 'a fuel reservoir v6 which isY provided withth'elusual construction of float" controlneedle valve for controlling the admis-v sion of fuely throughE the inlet. which vis conrlectedV to a source offuellsupply formaintaining a constantlevel of ffuel within the reservoir. l The an enlarged portion '7 provided .with fuel lpas-Q. sages 8 and 9, fuell passage 8 is in vdirect,confnnunication with,the'fuel-reservoir 6 and the fuel pas-A sage 9 vis incommunicationwith-the fuelVreser-- engine as the speed increases ordeCreaSe's. By:

von` through'ja ycalibratediplug 10 fas shown in Figure 1. The' passageQl terminatesiin aboss 11 formed` in the inside of thebottom portion 4 and has secured-,therein the main nozzle 12 of thecharge forming device orv carburetor and rthe crossgsection area of saidV nozzle is greater than so\ ,that ,under.norrnal conditions,fuel from the acceleratingjwell will j accumulate in the nozzle I Y. ylanfdibe@discharged therefrom upon theopening l and further objects :and advantages `of l of the'ithrottle valve as will belater described, 110

section. showing `7o i 10?5' fthe crossfsection area ofthe calibrated 'plugrlO the. 11101291 increases, and sivingrioh mixtureion A From the foregoing description it will be seen that I have provided Aa chargegforming device with an idling passage extending from the carburetor or source of supply and terminating posterior of the throttle provided with meansfor controlling the richness of the mixture passing through the idling passage by providing van air inlet with means for manually adjusting the size of the saine and thermostatio means controlling the admission of air.

In the construction of chargeforming device as herein shown, assuming that the throttle is in the positionpshownv in Figurel, the idling fuel mixture passes through the passage 15` and is delivered posterior of the throttle, the samerbeing heated as it passes through the bore formed in the thickened portionof the heat chamber and the richness of this mixture is automatically controlled bythe thermostatic controlled Valve so that the proper explosive mixture will be produced and delivered posterior of the throttle until the throttle moves into such position that sufficient suction is produced upon nozzle 12 toicause the nozzle to deliver fuel intothe atomizing tube. This particular construction allows the transfer of one speed to another without any dead spots in the transfer. I am aware that my invention which consists in controlling the richness of the mixture passing through the idling pasage by a thermostatically controlled' means canfbe used in connection with various formsaf carburetors and charge forming devices which use Van idling passageandjtherefore I do not wishrtoV limit myself to the details of construction shown Y as I am aware that various changes can be made without departing from the spirit of my invention.

What I claim is: Y Y A charge forming device for internal combusvrtion engines comprising a body having a carbureting passage extending therethroughhaving an air inlet at itslower end and a mixture outsoV let at its upperend, a throttle valve in -said carbureting passage, saidbody being provided with a projection in its bottom having a Vfuel passage, a nozzle disposed in said fuel passage and extendat its lower end and in communication at itsy vupper end with said carbureting passage posterior of said throttle valve, .an auxiliary nozzle carried by the bottom of said body Vextending into the enlarged lower end of the idling passage and a constant'level reservoir for feeding fuel to said nozzles. Y

4 FRANK H. HEITGER.

Ving upwardly therefrom, a collar surrounding iso

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