US1319789A - Fisfss ss - Google Patents

Description

s. c. NEWCOMB.

CARBURETER.

APPLICAHON FILED 001'. 2-5. 19H).

Patented Oct. 28, 1919.

- air to internal combustion or Roan: scrrtm'rn, mnssacnus'nm's, Assxenoa T0 NEweoMB CARIBURETER comrm, A convolution OF NEW YORK.

BARB UBETER.

Specification o t Letters Patent.

I Patented Oct. 28, 1919.

Application anaemia-r as, 1915. semra g izeaa.

To alt whom. it may concern: a I

Be it known that I, EDWARD Covnnm' NEW- oonm, a citizen of theUnited States, and a resident "of North Scituate, in the county of Plymouth and Commonwealth of Massachusetts, have invented certain new and useful Im rovements in Carbureters, of which the foll dwing is a speeification.

My invention relates to carburetors such as are used for supplying a mixture of fuel and the same liquid fuel which is used for this pu ose,

liquid fuel in the mixin chamber, when the carburetor is operate under small loads at low temperatures, under which conditions there is a tendency for the heavier fractions of the liquid fuel to conense in disturbing quantities. This and the other objects of my invention are fully explained in the following description.

In the drawings which 'are referred to herein and form a part hereof, is illustrated one embodiment of my invention, the same servin in connectionwith the description to explain the principles and construction thereof.

Figur 1 is a top plan view of my invention. Fig. 2 is a sectional elevation on the line AA of Fig. 1. Fig. 3 is a sectional view on the line BB of Fig. 1. Fig. 4 is an-enlarged view in section of the throttle valve and atomizer, and Fig. 5 is a sectional view of the throttle valve on the line CC of Fig. 4.

Similar characters of reference refer to simi ar parts throughout the drawings.

Referring to my drawings, my carburetor a. shell'or easing 1, aving an outmixture in the form of a flan neck 2, adapted to be connected to the manifold of an engine. This outlet is controlled by a butterfly throttle valve'3. e casing 1 is open at its lower end and within this therein. tion by the prevent undue aem i y the threaded stud 8, the

thereby enriched.

of the pipe 16 communicates nozzle. InterppBed casing is secured! the longitudinally adjustable tubular member 4, the lower end of the member 4 being insertedinto the base 6, which serves as a guide therefor. The base *6 is removably secured to the shell 1 by the screws 7.

he upper end ofthe member 4 is secured a stud 8, which extends upwardly through the neck 9 0f the casing 1. The neck 9 is interiorly threaded with a left hand thre to receive the knurled adjusting nut 10 which is itself tapped and interiorly threaded with a right hand thread to receive nut 10 and the stud to secure th member 4 to The member 4 is held against rotafrictional contact with the base 6, or an other means. The member 4 is open at its lower end and is, rovided in its side walls with a multiplicity of narrow elongated slots 11. ese ports are normall closed by'the piston valve 12, the fit of which is such that the air will be graduall withdrawn from the chamber above the Va ve and the valve gradually raised by the suction of the 8 s ervmi as means in the, s ell'l, and

The piston valve 12 is provided with ports h discharge into the elongated slots 11. piston valve 12 is a extends downwardly In the lower end of t e member 4 is secured a ring 15 upon 12 rests when the carand which constitutes astop limiting the downward movement of t e valve. It is apparent that when the nut 10 is rotated so as member 4, the piston will be carried with it and the needle valve correspondingly withdnawn from the fuel nozzle of fuel is used, I

of which is somewhat I- above t e normal level of the liquid fuel in "the float feed chamber 5, and

' discharges into ureting chamber.

The lower end through passages 17 and 18'with the passage 19, through which liquid fuel is supplied to the fuel between the passages 17 t e cal-b adjust its positionto elevate the tubular v mg chamber in the casing 1.

, the sta'nd'pipe 16. In

and 18 is a valve 20 which is normally held against its seat 21 by the spring 22 so as to cut off the flow of fuel fuom tli'e passage 19 to the standpipe 16. \Vhen, however, the valve 20 is depressed from the seat, fuel us free to flow'from the float feed chamber to the base 6 is formed an annular sun 23, which is partially covered by the such or casing l when the shell or casing'is in position on the base. At one Joint in the base I which against rotation by the set-screw 28. shaft 27 extends a through the throttle provided with a central longitudinalpassage, 29, whic is in open communication with the pipe 25. The outer end of the assnge 29 is closed by the plug 30. The 01- low shaft 27 at a point corresponding with the central uxiu line of the throttle valve is provided with a transverse passage 31, rhoked lit the point 32. In the passage 31 is driven a bushing 33, the upper end of which is somewhat reduced in diameter, and which is of such length and diameter at its inner end as to leave but a small annular space for the passage of liquid about its innor end. The outer end of the bushing 33 is in open communication with the carburet- The throttle e is recessed on both sides a part of its opening movement close or cover the ports of the transverse passage through the shaft 27. The time of closure may be determined by the recesses in the throttlivalve. The stem 'of the primlug valve '20 may be oonnecti d to a rod or any other means for operutii'ig it from the dash of tlucar to the engine to which the rurburetii-r is attached.

The operation of rnv device is as follows: When the operator desires to start the m0- has been at tuched, the valve 20 is depressed from its scat 21, and the engine cranked. The 5110- tion produced will cause liquid fuel to overflow. from the standpipe 16, from whence it will run into the sump The, throttle being then nearly closed, a high vacuum will he produced on the engine side of the throttie, which high rated through the passage 31 to the pipe 25, which will caus p 23 to be drawn through the passage 24 and the pipe 25 )past the bushing 33, where it thorougily pulverized or atomized and'aen ated by the air flowing charged. orifice of the bushing 33 at-a high velocity and the r p idly traveling stream of eng ne without; undue an interiorlv threaded neck,

vacuum will be communi-- up r end 0 mixture will be carried by its velocity, through the center of the manifold, to the reoipimtlon of the liquid fuel contained t erein. -As soon as the engine has been started and suihciently warmed the valve 20 may be ermltted to return to its seat, after which t e carbu ret er will qpenate in its normal manner, the liquid fuel bein then snip lied from the fuel noz zle 14; alith the Km grades of fuel now available, the heavier fractions tend to condense in the mixing chamber in disturbing quantities when the carburetor is operated under a small load, and particularly in cold also when theengineis first and the carburetor is cold. All of tie liquid fuel so condensed is collected in the sump 23, from which it is hi h vacuum existing between the throttle va ve and the engine, through the pipe 25 and past the inner end of the bushing 33, where it is fine] pulverized by the air rushin at high vel ocity through this bushing. Tlia recesses in the throttle valve are so formed that when the throttle valve is up proximatel one-half open' the orts in tie hollow sha t 27 will be closed an the mechanism tl'llOWlliOllfpf action, because with the throttle valve one-half open the travel of the mixture through the cal-bursting ehamer and manifold'is so rapid that there is little tendency on the part of theliquid fuel to cmidense;

With my device it is not possible to flood my carbureter beyond the operating point, because the fuel, as first? at-it overflows from the stundpipe 16, is swept away through the pipe 25 in a propei'l pulverized and aerated condition. It is al so apparent that when the'engine is at rest the standpipe 16 will not overflow even if the valve 20 is in the open position.

By rotating member 4 may valve 13 correspondingly withdrawn the fuel nozzle 14, thereby enricl'iing the mixture, and by rotating the nut 10 111 the opposite direction the member 4 may be lowered, carrying with it the needle valve 13, thereby reducing the percentage of fuel in the mixture.

Having described my invention, I claim: in combilm--.

carburetor L comprising tion a carburetlng chamber provided with a. tubular memhaving ports in its, well a tlu'emlrd iatudi exber mounted therein and provided with carried by the tendmgupwau'd through said neck, an ad-v justing nut exteriorly threaded to fit said neck and tap ed and threaded to receive the f snid stud, archnmbered IlStOIl va ve mounted in fuel nozzle discharging into in said vailve, a needle vulve'carried by the piston valve projecting into said nozzle and said tubular mem cr -a fiilld chamber a stop carried by the tubular member adapted to limit the downward movement of the piston valve.

2. A carbureter comprising in combination a earbureting chamber provided with an interiorl threaded neck, a tubular member mount therein having ports in its wall 'and provided with a threaded stud extending upward through said neck, an adjustin v nut exteriorly threaded t0 fit said neck am tapped and threaded to receive the upper end of said stud, said threads of said nut being respectively one a right-hand thread and the other a left-hand thread, a chambered piston valve mounted in said tubular member, a fuel nozzle dischsu' ing into said chamber in said valve, 21 neecle v'alve cerried-by the piston valve Pl'OjCCtlllf into said nozzle, and a stop carried by tie tubular member adapted to limit the downwardmovement of the piston valve.

3. A carbureter comprising in combination a tubular member having air ports in its wall, a chambered piston valve mounted in said tubular member adapted to uncover said ports when raised by the suction of the engine, a spray nozzle'discherging into the chamber in said piston valve, ports in the wall of the piston valve discharging into the ports in the wall of the tubular member,

a needle valve carried by said piston valve projrctin into said nozzle, :1 stop carried by said to ular member adapted to limit the downward movement of said piston .valve, and means for adjusting said tubular memher with reference to smd nozzle.

Signed at New York city, in the county of New York, and State of New York, this 11th day of October, 1915.

EDWARD COVERLY NEWCOMB;

Witnesses MARGARET A. H'scK, BENJAMIN T. AnnAMs.

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