US1029897A

US1029897A - Carbureter.

Info

Publication number: US1029897A
Application number: US42956308A
Authority: US
Inventors: Alfred C Stewart
Original assignee: Individual
Current assignee: Individual
Priority date: 1908-04-27
Filing date: 1908-04-27
Publication date: 1912-06-18
Anticipated expiration: 1929-06-18

Description

A. C. STEWART.

GARBURETER. APPLXOATION HLBD APB. 2v, 190s.

Patented June 18, 1912.

2 BHEBTS-SHEBTL A. o. STEWART'.

GARBURETER. PPLIOATION FILED APR.zv,1gzos.

Patented June 18, 1912,.

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CARBURETER.

Specification of Letters 12a-tent.

Patented June 18, 19312.

Application filed April 27, 190,8, Serial No. 429,563.

To all whom zr may concern:

Be it kno-wn that I, ALFRED C. S'reuuin'r,

' i citizen of the United States, residing at nos Angeles, in the county of Los Angeles and State of California, have invented a new and `Iuseful C arbureter, of which `the following is a specification.

yThis invention relates to carbureters for 'use ivith internal combustion engines, and its main object 1s to provide a carbureter 1n .which the richness or proportion .of fuel to 1 air in the mixture, is `increased ratherthan diminished when the throttle is nearly or quite closedso as to barely keep the engine ...running- A further object of the invention is to provide for lushing the carbureter in Starting.

, Another .object of the invention is to avoid the presence of any obstacles in the `path of .the mixture which would interfere.

with or deteriorate-the mixture by baffling l luireter'. in Fig. 1. Fig. 3 1s a section on line ac3-m3 the current and .condensing the gasolene.

Another object .of the invention is to pro vide foruniform distribution of mixture in `:manifolding to .a number of cylinders, for -,eXa1nple, in a six-cylinder engine.

The accompanying drawings illustrate `my intention.

Figure 1 is a Vertical section of the carli`ig.'2 is a section on line M -052 chamber 2 in its lower portion, an air inlety chamber 3 above the oil chamber, and a suction chamber llv above lthe air inlet i chamber.

An oil supply tube 5 communicates into the bottom vof oil chamber 2, through a valve 6, which is closed .by a spring 7 and Aautomatically opened by-'aT Vtioat in the oil chamber, said float having a depending perfor-ate tube 9 engaging a stem 10 in the valve 6, to open the lvalve when the oil in the chamber v2 falls below a definite level, theoil being thus maintained at such `defi-` nite' level.

Air inlet chamber 3 communicates with the outer air thro-ugh a passage 11, controlled by the throttle 12. A valve 13 of frusto conical form rests against and cooperates with the lower part of the upwardly flaring wall portion 14, of the suction chamber, to form an air inlet opening, this valve being exposed to the suction of the suction chamber at its top, so 'as to be lifted in proportion to the amount of suction from the engine. Valye`13 is guided by its stem 15 working in a guide tube 16 which perforated at '17 to allow oil to pass in and out, the tube serving' as a -dash pot. An annular channel 18 is provided in the tube around the stem l5, this channel communicating through opening 19 with the upper part of chamber 2,

.which through an opening 20, communicates with the outer air. There can, therefore1 be no sucking of gasolene up through the space between the stem 'and the tube, this air communication preventing any condition of suction in the channel 18, so that the stem may work loosely and with slight friction in its guide tube, Without leakage of gaso-Y lene into the air inlet chamber 3.

A cup pocket or chamber 22, open at its top to the outer air, is formed in the Wall of chamber 2, and this cup communicates with the oil chamber through an opening` 23, in the bottom of the pocket, such com@ munication being controlled by a valve 24, preferably conical. carried by a stem 25, which is connected by a pivot to a lever 2G, pivoted to a link 28 Whici is pivoted to a bracket in a lat-eral extension 29 of the air haniber. The free end of lever 26, engages in a notch 31 in the stem 15 of the air supply valve 13., The pivotal connection of stem 25 to lever 26 is preferably adjustable in a slot 33 in lever 26, being set by clamp nuts 34 at any desired position to vary the Stroke of the valve, and stem 25 is adjustable by a turn-buckle 35 to properly determine its closure when the main or air valve is closed. A pipe or connection 36 extends from the cup 22 to some point in the connection between the carbureter and the engine; for example, to a header 38 which serves as a manifeldbetueen the outlet pipe 39 of the carbureterand the lrespective cyl inders Ll() of the engine, the pipev 36 being divided or manifolded in branches 36 leading into the header 38 at outlets 44 adja- ,cent to the intake of the respective cylinders.V The piping 3G. 3o is ot relatively small diameter compared to the header 38 and it terminates in a bulb or enlargement `l'l havingl a contracted outlet 4Q so that the issuing fluid is atomized by the sudden expansion and by the Change of velocity.

The operation is as tollows:--'l`he suetion rrom the engine lifts the valve ll, the throttle being open.` and air is drawn past the valve and past the oil outlet and there is also a. Condition of suction through pipe 3G. Btl, drawing' air from the cup or pocket 2Q to the intake ot the engine. it the same time the litt of valve l'l. operatesl through connections 9o. Q5. to open valve 2l, and allows oil to ilow trom eliamber l to eup 22. the proportions ot' the inlet opening 23. and the. suetion connection 3G being` sueh that the amount ot oil thus llowing` is always less than the Capacity ot the sues tion through pipe 36 and the pipe t opening into eup QQ at a. pointbelor.' the point; oi. communication with the outer air. that is, below the mouth ot said oup so that all the oil passing into poelzetl sucked alongr with the current ot air through pipes t. ft to the header 38, and issuing `violentl \T against the air in the header is atoinized and converted into vapor forming a mixture with the air. There. beingno throttle valve or other obstruetion in the path ot' the .t 'X- Iture between the plaee ol formation and the engine. all trouble due to deposition with subsequent evaporation and chilling is avoided. When 'the engine is at rest. the

cup or pocket QQ is partly full. namelyr to the level of theloil in theoil chamber l, the valve 'not being so tight as to prevent this partial filling'. The mouth ot' 'pipe 36 is below this level so that when the engine is started` the first eti'eet is to draw all this aeoulnulated oil through pipo 3G into the sir suppl)Y inthe header` givinT a 'flushed or extra rioh mixture which is desirable in startinf. wilVl'ien the throttle aty air inlet is partlyY Closed while the engineI running there is a condition ot suetion in the upper part o't the earhnreter` that is, in the suction Chamber 4 and in the header Connected thereto. and this tends to draw more air and oil from cup QQ and to lower the pressure .in said oup as compared with the Condition with full open throttle so that for a given opening of valve more oil will tlow with the throttle partl)v closed than with the throttle t'ullv open. t the same time air valve 13 is allowed to olose somewhat on ae- Count of deerease in the ditlerenee ot pres` sure on its lower and upper taees.y and the valve Q4 will eorrespondingl)r close. The net, result that a. smo ler amount ol' air will pass to the entrino. but tl'iis air will be Charged with a reiatielj; 'li'irgjer amount ot' u aeeount oit the increased suction pipe f-t. as abo-ie stated, so that al richer mixture supplied. This is desirable for the reason that when the supply of air is so diminished, enough oilinust be supplied to insure explosiveness ot thev mixture in spite of' the dilutii'igv effect ot the fuel `ases in the clearance. y

'ln the torni ofthe invention shown in Figs. 5 to 7, the easing 51 is formed 'with superimposed oil. air inlet and suction chambers 52. 54 and fuel is supplied to the oil Vehamber through a pipe 55, Whose outlet is controlled by a valve 56 carried b v a lever :'17, operated by' a iloat 58 in the oil chamber to maintaimgi definite level of oil therein. Valve titl is in a chamber f2 opening' laterally tro'in oil chamber' `ialve member 55). whose eonieal tace eorresponds with and rests on the upwardhT haring wall ot the sut-tion chamber has a stem 60 working' freely ina guide tube 6l, the stem liaringur an extension 62 passing lobsely through an opening G3 in the bottom of the tube Gl. so as to allow restricted passage of oil, thetanbe serving a dash pot. Said stein is tornied with an interior chamber tial. corninunieat'ing through :1 bore 65 in the exten'- siou G2, and an adjustable needle valve G6 screwing through the bottom .ot oil chamber 52 has a. loose needle 75 which projects into this bore to control Flow oli oil therethrough. interior chamber 64 also Comuninirates through an opening` GT with a Channel (3S inthe wall oftube 6l. said ehannel surrounding' the valve stein GO and eomniunieatingr through opening G9 with the upper part ot" oil Chamber 527 which is open lo eomn'iunieation with the outer air by au opening; 70. A tube 7l screws into a screw threaded bore. ot the valve member 59. and extends down into inner chamber til. the upper end of said tube having;- a bulb 73 and eonstrieted opening' T4 tor atomization ot the oil. B v turningv tube 7l the distance ot its lower end from the bottom ot chamber 6.1.- uia v be adiustetl. resty the oil will be at the same. height in the interior 'chamber tial: as in the oil Chamber, and will extend above the bottom of tube 7l, and when. theI engine starts the fluid will be sucked up through tube 7l until the level 'falls to the bottom of said tube, thus flush imgT the earbureter to temporarily enrich the. mixture. ln normal operation, the suo- 2 n is sntheient to break any liquid seal that. may form at the bottom of tube 7l. and to lieep the oil level at the bottom of said tube, and the amount ot' oil supplied is determined bv the head or ditierence in level between the bbttom ot tube Hand the oil in chamber :32.

and enoug'liair will pass'in through. ope' ings TO, tlf), Gi." 'to pass up with the oil through tube 7'1. to reduce the oil supplyto the proper amount tor steady rin'nliine, tor example at maximum output or Capaeitj,

this being determined by the size of opening i nasser 67. The channel 68 has the same function as above explained for channel 18. As the valve member 59 rises, it varies the height of tube 71 and thus diminishes the feeding headE but this may be compensated by prop erly shaping` the valve G6.

Throttle 75 controls admission of air to air inlet chamber 53 and by its closure regu lates the suction and air oil feed as above described for the form shown in l to 4.

l-Vhat l claim is:-

l. A carbureter comprisii'ig an oil chainber, means for maintaining a definite level ot oil therein, an oil cup communicating' with the cuter air and havingr means ot communication with said oil chamber. said means ot communication being' below said deiinite level et oil, an oil control valve cont-rollingF eoniimunication between the oil chamber and the cup, an air inlet chamber7 a throttle controlling yadmission ot outer air to said air inlet chamber7 outlet means for connecting the air inlet chamber to suction applying means, and a. communication from said outlet means to said cup at a part of the cup below the point of communication with the outer air whereby the suction Yfrom the outlet means sucks oil together 'with air from said cup.

2. :l carbureter comprising an oil chainber, means for maintaining a definite level of oil therein, an oil cup communicating with the outer air and having means oit .cominunication with said oil chamber, said means of communication being below said definite level ot oil. an oil control valve cont-rollingI communication.between the oil chamber and the cupv1 an air inlet chamber,a throttle controlling admission of outer air to'said air inlet chamber, outlet means for connecting the air inlet chamber to suction applying' means, and air control valve between the inlet and the outlet means. and operated by the suction at the outlet.y said valves being connected to operate in correspondence, and a communication from said outlet means to said cup at a part of the cup below the point ot communication with the tion to suction applying means. an aircon trolled valve between the air inlet and out let means and operated by the diilference of pressure between said air inlet chamber and the outlet means to operate the valve a connection between the 'said valves to means establishing communication trom the cup to the outlet means consisting ot a pipe having its inlet end extending into said cup to draw oil together with air from said cup, said pipe terminating in an enlargement with constricting openina into the outlet means.'

4. A carbureter comprising an oil chamber, a. cup exposed to outer air pressure, an oil controlling valve controlling communication between the oil chamber and the cup, an air inlet chamber, a throttle controlling admission of outer air to said air inlet chamber, outlet means for connecting the air inlet chamber `to suction applyingr means. and a means for communication from said cup to said outlet means consisting of a pipe having its inlet end extending into said cup to draw oil together with air from said cup, said pipe terminating in an enlarge ment with a constricting opening into the outlet means.

5. A carburetor for a multiple cylinder engine, comprisingr oil (supply means. an oil cup exposed to outer air pressure, a valve controlling admission ot oil 'from the oil supply means to thdicup, an air inlet chamber, a throttle controlling admission of air thereto, outlet means for said air inlet chamber provided with a "plurality ot' out-lets for communication with the respective cylinders, and oil communicating means extending into the oil cup to draw oil therefrom, and communicating with the respective out.- let means at a plu ality of points adjacentto the respective outlets thereof.

6. A carbureter comprisingoil Asupply means, an oil cup exposed to outer air pressure, a valve controlling communication from the oil supply means to said cup, an air chamber, a throttle controlling admission of the air thereto` outlet means provided with plurality of outlets adapted for connection to separate suction supply meansJ an air controlling valve operated by a ditference in pressure between the air chamber and the outlet means to control passage ot air therebetween, a connection to operate the oil controlling valve in correspondence with the air controlling` valve, and oil communicatingmeans extending into the oil cup to draw oil therefrom, and leading into the outlet means at a plurality of points in,

proximity to the respective outlets thereof.

7. A carburetor comprising a chamber vpen to atmospheric pressure, an oil chamber provided with means for maintaining,- a definite level ot oil therein and provided with means ot oonnnunication to said open chamber below said delinite level to allow oil to oiv'lrom said chamber to said open chamber` outlet means provided with means of connection to and communication with suctionapplying means, au air vinlet having means of eomn'iunieation with said outlet means, eomnumieating means lleading from the open ellamber to said outlet means and vonsisting of a pipe haring its inlet end extending into said open chamber whereby the suction from said outlet means draws the oil from. said open chamber which is supplied thereto from said oil chamber, a valve controlling the communication between the air inlet and` the outlet means responsively to the condition oi suction in the outletmeans. and a manually operated vulve for the air inlet means.

S. A earbureter comprising a easing'provided with -an airinlet and with an outlet, an air controlling valve niovably' mounted in said easing; to etmtrol conn'ininieation be tneen 'the ,inlet and outlet, oil supply means, an oil controlling falve means connected to the aforesaid air Controlling` valve and con trolling eonnnunication from the oil suppli1 means` lo the aforesaid outlet7 said oil con trollingl valve means being operated in enrrespondenre with the air controlling valve to restrict the supply of oil as the supply of air is restricted, but to continue to admit oil in restricted quantity after the Supply ot air is eut oli', and a Chamber interposed in the eonnnuniealion between (he said oil eontrolling valve means and the outlet to receive a reserve supply ol oil when the engine is startine.

S). In a Carburetor, a easingprorided with an air inlet. and a mixture outlet, a mixing chamber between said air inlety and mixture l outlet, an air Controlling valve mount-ed to move in the casing to control eomnninieation betweenA said inletl and mixing chamber, oil supply means, valve means controlling the oil supply to the mixing Chamber,v means Connected to said air Cont-rollingl valve and stopped and to furnish such oil to the mixy ing` chamber when the engine is starting.

10. A earliureter eoniprising an air inlet means, and a mixture outlet means7 an air Valve controlling communica tion of air from said inlet to said outlet means, oil supply means7 an oil accumulating chamber, in continual communication with said oil supply means and with said outlet means, an oil valve for restricting the suppl)v oi,l oil from said oil supply means te said oil accumulating chamber, and means for operating Said oil valve and. said aira'alve in correspondentre to restrict the supply of oil as the sup- -ply of air is restricted.

.in testimon)v whereof, l have hereunto `set my hand at Los Angeles. California., this In presence oi- A ARTI-inn P. limer-1jr, FRANK, L. A. G-nrfiirmi.