US1779886A - Carburetor for internal-combustion engines - Google Patents

Description

06523, 1930- w. H. MANNERS ET AL 1,779,886

CARBURETOR FOR INTERNAL COMBUSTION ENGINES Filed Oct. 12, 1928 Patented Oct. 28, 1930 i I UNITED STATES WILLIAM YHASLAM MANNERS AND CECIL WHES'IHEAD SPENCER, or xnuesnsnonr;

v rRANsvaAL, SOUTH ArRIo CARBVURETORFOR INTERNAL-COMBUSTION ENGINES I Application and October 12, 1928, Serial No." 312,140, and inthe Union of South Africa- tune 2,1928.

This invention relates to carburetor's for internal-combustionengines. V The ob 'ectv of the invention is to design the carburetor so as to obtain a more economical use or consumption of the petrol or other liquid fuel (hereinafter referred to as petrol) and consequent higherlefficiency in the. e11- gine or motor. i o I To the attainment of this object theinvention includes means for more efiectively comminuting or atomizing the petrol; means for controlling the supply of the petrol to said comminuting or atomizing means;

means for controlling the volume time 15 which is admitted for mixing with the comminuted or atomized petrol; and means for controlling the passageof the explosive mixture of air and atomized petrol to the engine or motor. r 1

' According to the invention the means for comminuting or atomiz'ing the petrol comprises or includes a part or member constructed to provide a fine or narrow slot or slit of such a width that the petrol by its passage therethrough under normal pressureor conditionswill be comminuted or atomized to a very high degree. 7

The means for controlling the supply ofi the petrol to the slot or slit may bedesigned so as to admit of any desired portion of'the length of said slot or slit being closed or'out 0a, and so that the remaining portion only functions to control the supply of the petrol. The part or member forming the slot, or slit for the passage of the petrol may be of tubular form,'having-a flat piece or surface in which the slot or slit suitably formed. As it is essential that thisslot or slit should be exceedingly fine or narrow, we have found that possibly the simplest way of makin'gthe slotor slit in the flat piece .or surface is by forming a cut or slit in the piece for a suitable portion of its length, then bending the portion of the piece at one side'of the cut or slit away from the other side, in such a way that either or both edges formed by the w cut or slit can be filedto the requisite extent to leave or make the slot or slit of therequisite width, after which'the bent portion is bent back .to its normal position. i"

The means forcontrolling the'supply of petrol passing to and through the slot or slit may include a cylindrical member or valve which fits the tube andisconstructed with a bevelled or tapered portion forminga knife edge or edges which, when the valve is r0 tated, are adapted to co-operatelwith the slot or slit in order to close or out 01f any de-', sired portion of the length of'theslot or slit. This valve is constructed to form al passage. for the petrol leading through it to a'pointv in the bevelled surfaceor face." The tube and the cylindrical member or valve are housed in or carriedvby a casting or-part forming the carburetor casing, vides the passage leading from the air con trolvalve to the valve which controls the passage of the explosive mixture to the en-- gine. ;.o o The valve "for controllingtheadmission of air and the valve for controllingthe, ad-

mission of the explosive mixture to the engine are preferably both in'the form of hollow cylindrical or sleeve valves. 1;

j The valve controlling thesupply of petrol to the comminuting or atomi'zing device, the valve forpontrolling the supply of air, and the valve for controlling thesupplyor. passage of the. explosive ,mixturetothe engine are preferably adapted to be actuated by a single control or operating means. 7

;The 'valvecontrolling the supply of petrol and the valve controllingthe' supply ofair are. constructed and set, forthe normal operation of theengine or motor, so that the proportion of air to petrol remains fixed or constant, for all positions'of the valves, while the'valve which controls the passage of the explosive mixture to the engine is opened proportionatelyto the openingzof theother valvesQ- This ensures that the proportion of petrol to air is constant for all speeds offthe engine, but that the speedofthe 'engine is increasedby'increasing the volume or quantity of the mixture Whichpasses thereto;

Means is provided for indeperidentlylactutan thevalve controlling the petrolsupply to obtain an enriched mixture, 'orto allow. of

an increa'se'in the quantitypf petrol relative which pro- 3 Fig. 2 is a sectional plan, the plane ofsec tion being indicated by the dotted line 2- 2 in Fig. 1. p H l Fig. 3 is an elevation of the complete carburettir-drawn to a reduced scale.

I Fig. 4; is an elevation of the member providing the slot or slit for atomizing' the petrol.

5 is a sectional plan on the dotted line 5"' 5, Fig. 1, and

Fig. Bis two views at right angles of the petrol controlling valve. I

In Figs. '1, 2 and 3 of the drawings the ridineral 1 denotes a casting which forms the casing or housing for the several valves hereinafter described. The casing 1 includes the two'hollow cylindrical parts 2, 3, and the intermediate rectangular "connecting portion 4. 5 is the float-feed chamber which is constructed with an arm or projection 6, the outer end of which is fashioned with a conical recess 7 to fit a tapered projection 8 formed on the part 4' er the casing 11- The arm'6 is retained in positien on the'tapered projection 8 by a screw pltig 9. The petrol from the float-feed chamber 5 passes into the space provided bythebottom' of the recess 7 below the inner end of'th'e pr'oje'etion'e. The plug 9 is provided witha passagell through whichthe "petrol can pass from the space 10 to the innerend of the plug 9.

' 12 is the-tubularpart or member which is housedin the part '4: of the casing 1 and is "constructed at the one end with a flange'or shoulder 13 which fits against the inner end at the screw-threaded hole in the tapered projection 8. The "tubularpart 12 is held in position by means of the screw plug'14 which is tapered at its inner end and screwed into engagement with the flanged end or the tubula'r part 12. The screw plug 14 is provided with a hole 15 which forms a passage for the etr'ol fromthe inner end of the plug 9 into the'lower end'of the tubular part 12. The upper portion 16 of the tubular part 12'is tapered slightly-see also Fig. 4-and fits a correspondingly tapered hole formed in an exteri'orly screw-threaded boss 17 on thepart -4: of-the casing 1; 18 is the piece in which the fine or narrow slot or slit 19 is formed.

As shown the piecev 18 is in the form of a iifat rat plate fixed in an opening in the side of the tubular part. 12. The slotor slit 19 is shown provided in the lower-portion of the plate 18, and may be formed therein in the manner ereinbeforeexplained, or in any othersuitable and preferred'manner.

20 (see also Fig. 6) is the cylindrical member or valve which regulates or controls the quantity of petrol which passes through the slot or slit 19 into the part 4 of the casing 1. This valve 20 is positioned in the tubular part'1'2 and is fashioned at its innerend with a bevelled or tapered portion 21, the edges of-which are adapted to co-operate with the slot or slit-1 9 in order-to-closeoigcut OfiQany desired portion at the length of'theslot or slit 19 to vary or regulate the quantity of petrol passing throughjsaid slot or slit 19. The edges of the valve 20, by working in contact with the inner surfaceotlthefiplate '18, remove any adhering foreign matter from the plate 18 and prevent choking or closing of the slot or slit 19 thereby. The lower innerend of thevalve 20 is shown of cylindrical shape so that itserve's as'a guide for the valve below 7 of the tubular part 12, the stem of the'valve extending upwardly beyond the flange 23.

In the hollow cylindrical part 2 of the cas v ing'l'is arranged the'air inlet valve which, as shown, is in the form of. a rotary hollow cylindrical or sleeve valve constructed witha portor passage 26 which is adapted to control the passage of air from the part2 to the part i of thecasing '1. 27 is a cap screwed on to thelower end of the part 2, which serves for retaining the; sleeve valve 25 in position. The valve 25'is constructed at its lower end with a stem 28 for rotating it.

"In the hollow" cylindrical portion 3 of the casing l is arranged the valve'29 "which controls the 'passage'of the explosive mixture to the engine. 'Thisvalve 29 is also in the form of a rotary hollow cylindrical or sleeve valve,

providedwith a port or' passage 30 which respectively," which levers at one end are constructed in the'form ofa' clevis or clamp for clamping them to their'respective valve stems after the valveshave-been set' in the requisite positions to ensurethecorrect proportions ofair topetrol, and volunie of'ex'plosive mirrthe nut 43 is rotated and the valve 20 lifted.

ture which passes tothe engine. Split pins 36, 37, are shown passing through the stems 28, 31, respectively, below the clamping ends of the levers 34, 35. The several levers 33, 34, 35 are operated simultaneously by means connected say to the outer end 39 of the lever 35. The means for connecting the levers 33,

34, 35, is shown including a yoke piece 38,

normal actuating means through the lever.

33, is shown including a nut 43 which has screw-threaded engagement with the threaded boss 17, a pin 44 fixed at one end in one of a plurality of screw-threaded holes 45 (for adjusting purposes), and a wire 46, attached by means of a connecting piece 47 tothe pin 44. The wire 46 passes through a flexible casing 48 to any desired point where it will be readily accessible to the driver of the vehicle. 49 is a clamp bracket for attaching the casing 48 to the side of the part 3 of the casing 1 opposite the end of the pin 44. By moving the wire 46 in the one direction,

thereby without being rotated. This ensures the slot or slit 19 being opened to a greater extent than it would be when normally operated with equal angular movement. In this way a richer mixture is obtained for the wire 46 in the opposite direction, by lowerinn the valve 20, will reduce the quantity of petrol to normal. 50 is a capfixed by pin 51 on the upper end of the stem of valve 20, above the clevis or clamp end .of the lever 33. This cap 50 has a milled edge to enable it to be used for setting or adjusting the petrol supply valve 20.

52 is a Washer arranged between the flange 23 on the valve 20 and the inwardly directed flange 53 on the nut 43, which washer ensures the valve 20 being lowered when the nut 43 is rotated in the requisite direction.

What we claim as our invention and desire I 2. In a carburetor for internal combustion engines, in combination, a'hollow cylindrical member having a very narrow slit through which the liquid fuel passes before being mixed with the air to form the explosive mix ture, and a rotary cylindrical valve constructed with a tapered flat face which forms a recess and an inclined edge to co-operate with the slit, and with a passage extending from one end of the valve to the recess formed at the back of the slit by the tapered flat face, the inclined edge directly co-operating with the slit to vary the effective length thereof in orderto' control the quantity of liquid fuel which passes through the slit, as set forth.

3. In a carburetor forinternal combustion engines, in combinatioma hollow member having a narrow slit through which the fuel asses before being mixed with the air to orm theexplosive mixture, a rotary cylindrical valve having a tapered portion which provides an inclined edge which directly cooperates with the slit to vary the efiective length of said slit in order to control the,

quantity of liquid-fuel which passes through the slit, and means for rotating the valve for normal operation, and means for raising and lowering the valve, as set forth.

7 4. In a carburetor for internal combustion engines, in combination, a hollow member having a narrow slit through which the fuel passes before being mixed with the air to form the explosive mixture, a rotary cylindricalvalve having atapered portion which provides aninclinededge which directly cooperates with the slit to vary the effective length of said slit in orderto control the quantity of liquid fuel which passes through starting the engine or motor. Movement of the slit, means for rotating the valve for normal operation,and means for raising and lowering the valve including a threaded boss formed on the carburetor casing, a nut engaging said boss and rotatably engaging the valve, and hand actuated means for rotating the nut, as set forth.

5. A carburetor. for internal combustion engines, including, in combination, a hollow member-in which is formed anarrow slot through which' the liquid fuel passes before being mixed with the air to form the explosivemixture, a rotary cylindrical valve constructed with a tapered portion directly cooperating with the slot to control the quantity of liquid fuel which passes through the.

slot, a rotary sleeve'air admission valve, and a rotary sleeve valve for controlling the passage of the explosive mixture from the 'mixing chamber to the engine, and means for simultaneously operating all of said valves, assetforth."

In testimony whereof. we havesigned our namesto this specification.

7 WILLIAM HASLAM MANNERS.

CECIL WHESTHEAD SPENCER.

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