US1263047A - Carbureter. - Google Patents

Description

I L. R. EVANS.

CARBURETER.

mwucagon HLED 05c. 1-8. new.

"1,263,047. rammed Apr, 16,1918.

2 suns-safer t.

INVENTOR L. R. EVANS.

CARBURETER. APPLICATIYOH nuzn mac. I8. 1915. 1 ,263,047. Patented Apr. 16', I918.

' 2 SHEETS-SHFET 2.

nrromsr UNITED STATES PATENT OFFICE.

LEIGH R. EVANS, OF ROCHESTER, NEW YORK, ASSIGNOR TO CYCLEMOTOR CORPORATION,

' OF ROCHESTER, NEW YORK, A CORPORATION OF NEW YORK.

cameraman.

Specification of Letters Patent.

Patented Apr. 16, 1918.

Application flied December 18, 1915. Serial No. 67,690.

To all whom it may concern:

Be it known that I LEIGH R. Evans, a citizen of the United tates, and a resident of the city of Rochester, in the county of Monroe and State of New York, have invented a new and useful Carbureter, of which the following is a specification.

This invention relates to carbureters for gasolene engines, and more particularly to carlliureters for engines using the two-stroke c c e.

()ne ofthe objects of this invention is to devise a simple and efficient carbureter for gasolene engines which can be cheaply made and assemb ed and which can be attached directly to the engine cylinder.

A further ob]ect of the invention is a car- .bureter' for gasolene engines using the prove the construction of carburetors in general, particularly by reducing the number of parts and the number of operations reuired to make these parts and assemble Further objects and advantages will appear as the description progresses.

The invention consists in the parts, and in the combinations and arrangements of arts, which are more fully described heremafter and particularly pointed out in the ap endedclaims.

n the accompanying drawing in which is illustrated the preferred physical embodiment of the invention and in which like reference characters refer to like parts in the several views, Figure 1 is a top plan view of a carburetor embodying the invention, showing the same attached to a portion of an engine 'cylinder; Fig. 2 is a vertical section throu h the float chamber, showing the rest of? the carbureter in elevation, said section being taken substantially on the line 2-2 in Fig. 1; Fig. 3 is a transverse vertical section diagonally through tin? float chamber and crosswise of tlie'mixin tube, said section being taken substantia 1y on the. line 3-3. in Fig. 1; Fig. 4 is a vertical longitudinal section through the mixing tube and nozzle, said section being taken substantially on the line looking from the right in Fig. 1, the cover a cap for the intake opening of the mixing tu ebeing removed; and Fig. 7 is a top plan view of the nozzle forming part of the carburetor.

Referrin in detail to the accompanying drawing, t e carburetor comprises a main casting or body portion A, which is shown attached to a portion of the engine cylinder, designated B, by screws 5; a gasket 6 being. interposed between the carburetor and said engine c linder to make a gas tight joint. The carburetor is intended to be laced over the inlet port of the engine and is provided with a rectangular opening 7, shown in Fig. 2, designed to register with said inlet port; and this opening 7 communicates with a mixing tube or conduit 8 which extends longitudinally of the body portion A of the carbureter. This mixing tube 8 is preferably so proportioned that its cross sectional area 15 smallest throughout a region between its ends, particularly at the point where the nozzle, hereinafter described, extends into the mixing tube .8, this roportioning of the cross sectional area eing' accordance with the well known princi e of the Venturi tube. The outer end 0 ,the mixing tube 8 has flaring walls forming a bell-shaped end, around which is an annular flange 9, see Fig. 6; and located within the edge of this bell-shaped end of the mixing tube 8 are two op ositely disposed lugs 10. A circular baflie plate 11, which is a little smaller in diameter than the diameter of the inside of the bell-shaped end of the mixing tube 8, fits against these lugs 10; and a cap 12 having an annular flange 13 adapted to fit around the annular flange!) is fastened over the end of the mixing tube 8 over the bafllc plate 11 by two screws 14, said cap 12 having a central circular hole 15 therein.

Cast integral with the body portion A of the carburcter arc the walls and bottom of a cylindrical float chamber 16; and in this float chamber 16 is the usual float 17 secured to a valve rod 18, the lower end of which} 4s axial bore 40 an tom of the float chamber 16, and the upper end of which is pointed. The pointed upper end of the valve rod 18 cooperates wit a conical valve seat 19 in a pl 20 secured 11'] an elbow member 21 intcgra with thump 22 of the float chamber 16. This el bow member 21 is provided with a suitable ii'nion 23 for attachin the gasolene supply pipe (not shown) t ereto, the gasolene ing conducted to the valve seat 20 along passa cs 25 and 26. In the cover 22 is a vent is 24, as shown in Fig. 1. The cover 22 is provided with an annular flange 27 which seats the pointcd'end of the screw 41. its lower end is a groove 42 which communifits inside of the float chamber fastened to said float c amber b a screw 28 and by a thumb nut 29 on t e threaded needle valve 30, a washer 31 of leather or other suitable material being placed under the thumb nut'29 to prevent the escape of gasolene which may pass by capillary action up along the screw threads on the needle valve 30. The lower end of. the needle valve is ta cred and projects into a conical hole 32 m the bottom of a recess 33 which opens into the float chamber.

- Integral with the body portion A of the carbureter and projecting downwardly be- 16, and 13 low the mixing'tube 8 is a rib 34in whlch is a vertical threaded hole 35' communicating with" the tapered hole 32 in which the needle valve 30projects by a horizontal passage 36 closed at its outer end by a screw 37, which facilitates manufactureand permits cleaning; In the-threaded hole 35. is screwed a nozzle 38 havin a hexagonal head'39 by means of which it isscrewed in place and an axial bot-e40 closed at its lower end by a Surrounding the nozzle 38 near cates with the axial bore 40 in said nozzle by a transverse bore 43 the groove 42 bein located in the same lane as the passage 3 The upper end of t e nozzle 38 is tapered,

and in this tapered end ortion is a small vertical jet passa e 44 lea down into the a number of inclined jet passages 45 arranged around the central jet assa e44 in acircle and also leading-down into t e axial bore 40.

The 0 eration ofthe carbureter is as follows: T e asolene flows supply tan or reservoir (not shown) through the usual supply pipe and through the passages 25 and 26 into the float chamber 16; and when the asolenc has risen to a certain level in this heat chamber, the float 17 valve rod 18 a ainst the seat 19 in the ]plug 20 and shuts 0 further sup ly of game one. On the suction stroke 0? the engine air is drawn through the central openin 15 in the cap 12, around the annular space etwcen the baffle plate 11 and the inside edge of the flared end of the mixing tube 8 and along said mixing tube over and around the nozzle 38. The

from a suitable rapidly moving current of air over the noz- 5intothemixingtahe8ma finely divided spray, and this lens is mixed with the air to form the csired ex-. plosive mixture. Since the area of the cross section of the mixing tube 8 at the point where the nozzle 38 rojects into said mixing tube is smaller than the cross sectional area at the inlet opening 15 and the o ning 7 oommunicatin the velocity of t e air as it passes the nozzle 38 is hi her than at either. the entrance or sages 44 and with the engine cy inder,

the disc rge end of saidmixing tube; and

in this way, for the samedifierence in pressure between the inside of the engine cylinder and the outside air a greater-suction is and 45 thanmlnng tube were of exerted on the jet usages 44 would beexertedi the uniform cram sectional area. 'Ihis causes a 3!,

more read respopge of the gasolene to relativel sma motion pressure at low piston and also-causes the sprayed into'tbo mixing tube at the very beginning of the suction stroke. It is also noted that the jet passages 44 and 45 extend in a direction transversely of the mixing tpbe 8, so-that the spray from these jet passages im mges against the u per curved face of e mixing tube 8 an is further atomized. The rate of the flow of the lens to the nozzle 88 can be re atefi y beam the thumb nut 29 an adjusting the e valve 80, therebiy permitting the proportion of gasoljene an air to be nicely regpllated, as required. i the common type of gasolene on 'no new the two'stroke cycle,-w1th.which' am tam iar, the inlet port is controlled by the ston of the engine. and there is a short interval of -time m-the compression stroke during which a certain rtion of the carbureted air in the era case is expelled. This expulsion of carburetedair takes place through the same passage by which the carburet'ed air is drawn into the crank case and in which is located the inlet su plying gasolene to the inflowing air; 0 means or supplying gasolene is often in the form of a ct through which the asolene, and-also luricating oil in case lu ricating oiliis mixed with the 'gasolene, is drawn b -the suction of the iston on the intake strolie.

On t 1e intake stroke of the engine the flow of gasolene through the jet does not cease immediately after the piston finishesits intake strokc, because of the inertia of the moving h old; and consequently, a larger qnantity 0 mixed asolcne and lubricating oil is drawn from t e jet than can be taken up by the inflowing air. Upon the compression stroke,'as before stated, part of the carburetor] air in the inlet passage to the engine is driven outward toward the carbureter, and this carburetcd air in turn forces air which lenetobe is in the tube surrounding the jet outward through the carl'nn-eter, the result being that a large proportion of the excess of mixed gasolene and lubricating oil around the jet is picked up and carried along mechanically and, if the carburetor passage were open, this mixed gasolene and oil would be thrown out of the carburetor.

The expulsion of lubricating oil and gaso' lene by the action above described causes a serious loss of fuel and oil, not to mention the. disagreeable effects resulting from the contact of the oil and gasolene with anything which may happen to be close to the intake opening of the carburetor. With some types of engines and under some conditions, this expulsion ofg: solenc and oil might not cause serious damage; but when a carburetor is applied to a motor for propelling a bicycle or the like, it can not ilt easily placed where it will be convenient and accessible and at the same time in a position where oil and gasolene expelled from it will not spatter on the clothes of a person riding the bicycle.

According to this invention. however. the battle plate 11 is positioned in the direct path of outward movement of the expelled gasolene and oil and prevents such gasolene and oil from being thrown out of the mixing tube Also, this gasolene and oil, instead of being wasted, is held mechanically by the lower portion of the enlarged outer end of the Iui iug tubefiand is in the direct path of infiowing air, so that it is taken uJ'ny such air on the next intakc stroke o the piston and returned to the engine. It should also be noted that while the liiailie plate 11 prevents the expulsion of oil and. gasolene. it docs not materially increase the opposition to the intake of air, because the int'lowing air has to make only one sharp turn around the edge oi the halite plate.

The simplicity of the whole construction of the carbureter embodying the invention is apparent. and the case and chcapness with which the dili'erent parts may he mannt'actnrcd and asscmbltal is also apparent. The cover 2;! to the lloat chambciilti may be easily and quickly removed to permit clcaning of the .tioat chamber and of the valve seat 1! in the same way thenccdlc valve 3%!) nan he quickly removed for cleaning purposes, and by removing the screw 37 convenient access is had to the horizontal passage Pitt. The nozzle 38 may he unscrewed from place and the jet, passagescleaned, or the screw 41 may be removed for cleaning the axial bore it) in the nozzle. In this way the diti'crent passages and holes which are likely to be clogged by foreign particles in. the gasolene can be easily and quickly cleaned without detaching the carburetor from the engine. 1

Obviously various changes may be made m the particular construction shown and described without departing from my invention, and i do not wish to be restricted to the details of this construction illustrated which cxen'iplities only one form or embodiment which my invention may take.

hat I claim is:

1. A carburetor for engines using the twostroke cycle comprising a mixing tube, means for atomizing a liquid in said mixing tube, said mixing tube having its inlet end flared and having lugs integral therewith the outer faces of which are substantially flush with the outer inlet end of said mixing tube, a battle plate slightly smaller. than the inside periphery of the flared end of said mixing tube, a convex cap fitted over the flared end of said mixing tube and having a central opening therein smaller than said baffle plate, the edge of said cap forming a tight joint with the. edge of the flared end of said mixing tube, and screws extendin through sai cap and battle plate into sai arhuretcr for engines using the twocycle comprising a mixing tube, means for atomizing a liquid in said tube, a battle plate located adjacent the air intake end of said mixing tube, said haliie plate being smaller than the inside periphery of said tube, means carried by the wall of said mixing tube for supporting said battle plate in proper position, and a cap having a central opening therein smaller in size than said hallie plate. said cap being secured tightly to the end oi said tube outside of said ballle plate.

-1. A carhnretcr comprising a mixing tube arranged substantially liorir iontally, means for atomizing a liquid in said mixing tube, a batile plate secured ovcl'the air intake end of said mixing tube and s nallc than said intake end. a cap secured over the inlet. end of said mixing tube and having a central opening therein. said tube and cap being constrictt l in cross section on cacti side of said batllc plate, whereby a pocket for catching liquid is formed under said battle plate.

4. in a oarburetcr for gasolcne engines, in

combination with a mixing tube, theair vintalnend of said mixing tube being flared outwardly. a battle plate secured over the tlarcd end oi said mixing tube, said batiie plate being maller than the inside periphery of said flared cnd'of said mixing tube, a cap disposed over said halite plate and spaced therefrom, said cap fitting tightly around its edge against the flared cud of said mixing tube and having a central opening therein smaller than said bathe plate, means whereby said battle plate is held in place between said cap and the end of said mixing tube, and means for atomizing a liquid in said mixing tube.

5. In a carburetor forgasolene engines, a mixing tube, a float chamber integral with said mixing tube and havingi3 an open top, eating 'with said float chamber, a need]: a cover for said flout, chum er having an valve for regulatinthe flow of liquid from inlet passage therein, means within said said float chamber saidnozzln, Handle 10 chamber cuntmilml by the level of liquid valve projecting thrzgfih said 00101 and;

5 therein for governing the flow of liquid thumb nut on said n 16 valve through said inlet passage, a nozzle prosaid cover in place. jeicting into said mixing tube and oommuni- LEIGH B.

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