US1452451A - Carburetor - Google Patents

Description

Apr. 17,1923. 1,452'9451 I A. H. WEBBER CARBURETOR Filed Deo. '7, 1920 W@ www ATTORNEYS Patented Apr. 17, 1923.

UNITED sTATEs ARTHUR H. .TEBBEE, OF BOSTON, MASSACHUSETTS.

.y CARBURETOR.

Application led December 7, 1920. Serial No. 428,944.

To all whom t may concerny Be it known that I, ARTHUR H. Idlnnsnn, a citizen of the United States, and resident of Boston, in the county yof Suolk and State of Massachusetts, have invented a new and Improved Carburetor, of which the following is a full, clear, and exact description. y

My invention relates to a carburetor, and aims to provide certain new and useful improvements in connection with a vdevice of this character.

In connection with carburetors it is a well appreciated fact that considerable difficulty has been experienced in providing an accelerating mixture. In other words, although the high speed mixture might be satisfactory, the operator will find that, in the event that the throttle valve were suddenly opened, and a load suddenly placed upon the motor, that in most instances the mixture produced by the carburetor-'would not be such as to cause the motor to accelerate properly, and in many instances the motor would stall Thus it isan object of the present invention to provide a carburetor which will produce an extremely efficient mixture during idling, and high' speeds and will additionally produce an efficient accelerating mixture causing the motor to readily take hold during this interval, and virtually preclude any danger of the same stalling, upon it being suddenly subjected to a load, at a relatively low engine speed. l

A further object of the present invention is that of providing an extremely simple construction permitting of the accomplishment of this purpose, this construction being of such a nature as to eifectually overcome any danger of the parts refusing to function.

With these and further objects in mind the present invention aims to provide a carburetor including a housing which will comprise a structure including a plurality of nozzles, one of which is adapted to be actuated during the idling of the motor, a second of the same operating during all. speeds higher than idling, the present invention furtherlf! contemplating means which will. serve to build up a reserve supply of fuel during idling which will enrich the mixture during the accelerating interval to produce maximum power at such time and consequently overcome the difculty aforementioned.

Reference is had to the attached sheet of drawings as illustrating one practical embodiment of this invention, and it will be seen in this drawing ythat-- Figure 1 is a sectional side view of a carburetor embodying my improved construction and showing the parts of the same during idling position, and

Figure 2 is a view similar to Figure `l but showing the parts during the high speed position of the carburetor, and

Figure 3 is an enlarged fragmentary sectional viewy of a detail of construction.

A In these views the reference numeral 5 indicates the fioat chamber provided with the usual fuel intake 6, and enclosing' the conventional float that serves to regulate the flow of fuel through this inlet.V My vcarburetor further embraces a housingof any desired type, which provides a mixing chamber 7 above which is positioned a throttle valve 8, so that the .flow of air through the venturi 9 and past the nozzle 10 may be effectually regulated, it being of course understood that this air entersthrough any desirable opening 11 in the housing at a point beyond the venturi 9, and is susceptible to control [by means of the choke valve 12.

It is to be appreciated that the foregoing is conventional construction, and may be of any desired type, and a flow of fuel from the float chamber 5 into the nozzle 10 is permitted. by the passage 13 extending between these two members. However, contrary to the conventional construction, it will be seen that the housing of the can buretor provides well. 14 which latter has its upper end extending to a point well above the upper end of the nozzle 10, and mounted therein at its upper end is a nozzle 15, it being also seen that the lower end of this well is connected to the float chamber 5 by means of a passage extending between the base of the nozzle 10 and the lower portion of the well.

Further, it will be noted that in the embodiment illustrated I provide a passage 16 in the body of the venturi 9, and this passage is continued in the wall of the carburetor housing and merges into a mixing chamber 17 within which the upper end of the nozzle 15 extends. It is also to be noted that a passage 18 has its upper end in communication with the interior of the housing, and its lower end is connected with the upper end ofthe mixing chamber 17, it being seen, asfin Figure Bxthatfa valve' of any desirabletype" maybe interposed 'in the latter passage to regulate the flow through the for a purpose hereinafter brought out.

Thusassuming that thel throttle valve 8 is closed to itsrfullest position', it will be understood 'that'a suction will be exerted `Within the Well 14: throughthe` ,orifice of the nozzle 15` a'nd'ithis,suction'will quickly result in a col'urri'nl of fuel completely filling the well, which colun'n has its upper end terminating at .thev upper end of the nozzle 15, or in yother Wodsatafpoint Well labove the nozzle 10. Simultaneously,with this action on thepart of lthe fuel, it vWillibe understood that air will flor: through the passagek 16 and past `the nozzle 15,. atvhioh point it will become charged 'with the fuel, thus forming an explosive mixture Wh-ichmoves .through the passage 18 andso into the intake manifold of the engine;

However, assuming that an operator opens the. throttle valve 8, it will be understood thatthe latter Will not' permit any appreciablefloiv of air directly through the venturi 9', and into the intake manifold before ithas completelyv uncovered the passage 18, In other Words, substantially Athe entire suction t i of the 'engine' will be exerted upon the now completely openiend ofthe passage 18, and this -Will obviously cause first al greater flov of fuel mixture, and secondly a richer fuel mixture, incident" to the fact that no co'mcease altogether.

As the throttle is opened the flew of air of `which it will overflow. The fuel mixture will now be produced by the nozzle 10 in association Withtheventuri 9, and it will be understood that incident to the overflowing of the fuel fromvthe upper end thereof that the mixture Will be virtually surcharged With fuel during that intervalof time which is required to exhaust the excess height of the fuel column Within the Well 14. Thus an extremely rich mixture Will be produced by the carburetor, While the motor is beingr accelerated.` ,y y f Thus all of the `objects of this invention have been accomplished, and it will further be understood that numerous lmodifications of structurevmight readil7 be resorted to Without in the least departing from the scope Of my claim7 Which Sf-f- A lcz'trlniretor including in `combination a body providing a mixing chamber, a venturi positioned in advance of said mixing chamber, a throttle valve positioned at apoint beyond said `mixing chamber, a nozzle exten ding into said venturi, said carburetor `being formed with a Well having its end ex tending into a plane above that occupied :by the upper-.end of the nozzle` to permit fuel to stand therein ata levelhigher than vthe upper end of sai-dnozzle, a source of fuel supply connected to both* said nozzle and l Well, a second nozzle communicating with the upper end of said Well, fsaid carburetor being formed with an opening for the passage -of .airV past said lastnamed'nozzle and also providing a mixing chamber adjacent said nozzle, said carburetor body being fur-v ther formed with apassageextendingfrom said lastnamed ymixingy chamber to `a point adjacent said throttle valvel y vARTHUR H: VEBBER;

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