US1213914A - Carbureter. - Google Patents

Description

c. LL SHEBPY. CARB'URETEB, APPLICATION F| LED AUG-6| Hi2- Patented Jan. 30, 191.7.

2 SHEETS-SHEET I. P

C: L. SHEPPY. CARBUBETER. APPLICATION min n.5, 1912.

2 SHEETS-SHEET 2 R 9 0 3 m M m M P.

UNITED STATES PATENT OFFICE.

bHARIiES L. SHEPPY, OF BUFFA LO, NEW YORK, ASSIGNOB TO THE PIERCE-ARROW MOTOR CAR COMPANY, OF BUFFALO, NEW YORK.

CARBURETER.

" lToalZ whom it may concern:

Be it'known that I, CHARLES L. SI-LEPIY, citizen of. the United States, residing at Bufi'al'o, in the county of Erie and State of New York, have invented a new and useful niprovement in" (iarburcters, of which the chewing is a specification.

This invention relates more particularly that type of carburetors for internal comustion engines which are'provided with no or more supplemental nozzles for inra'sing'the supplyof' fuel in the explosive mixture as the speed: of the engine increases. With thevordinary carburetors having a nigle fuel discharge-nozzle, it is extremely Z difficult, if not impossible,'to obtain an exlosive mixture of correct proportions of 'airfand gasolene for all engine'speeds, especially 1n the case of "engines having a 'nsiderable range of speed. 7 The mixture not rieh enough forlhigh speeds and it sftoo 'rich for low speeds Attempts have -been"made to overcome this difficulty by {providing a supplemental fuel discharge nozzle which is brought into action either -inanu'ally or automatically by the increase ing suction as the engine speeds up. The "imanually controlled carburetors are objec- "ao're'luire hand adjustment for dill'erent speeds. The carbureters heretofore made ,in which the action of the supplemental tion of the ,engine, are open to various practic-pl objections. In those in which an auxiliary air valve is arranged between the su pplcmental gasolene nozzle and the throttle valve, a perceptible period of time el" pses bctwecn the opening of the auxiliary a rvalve and the commencement of the discharge of gasolene by the supplemental nozzle, and this arrangement results in an illiperfeet and undesirable action of the carfl burctcr." The proportion of gasolene in the 'mixture is too high until the auxiliary air 5 valve opens. and the mixture is then diluted. or '\\eal cnedunlil the supplemental nozzle starts to discharge and correct the error. When. the supplemmital nozzle starts to dis-- charge, the proportion of gasolene is end deuly increased and the mixture remains too hmuy until the speed of the engine is con sidcrab] y increased. Thus the regulation of the mixture is not in strict accordance with 65 the gradually varying demands due to the I tionable because they are not automatic and Specification of Letters Patent.

gaswlenc nozzle isdependent upon the suc- Patented Jan. 30, 1917.

Application filed August 6, i912. Serial No. 713,677.

increasing speed .of the engiucm In other prior constructions the auxiliary air valve and supplemental fuel nozzle are so con? structed and arranged as to cause a sudden objectionable increase in the air and fuel supply instead of the gradually increasing supply necessary to the successful operation of motors having a considerable range of speed.

The object of this invention is to produce a. thoroughly practical and eflicient carburetor having, main and supplemental fuel supply nozzles which will operate auto matically so as to insure an explosive mix.- ture of proper proportions at all speeds of the engine, and in which the main fuel nozz'le can be adjusted to supply a small enough amount of fuel to produce good running at slow speeds, the supplemental nozzle being relied upon to supply the additional fuel necessary for faster speeds? This is accomplished by providing the carbureterwith a main fuel nozzle which is located in the main air inlet passage and supplies the fuel foiwslow speed running, and a supplemental fuel nozzle which is located between the auxiliary air valve and the throttle valve, preferably at a higher level than the main nozzle, and comes into action to supplement .the supply from the main nozzle only when the suction of the engine is great enough to open the auxiliary air valve.

In the accompanying drawings consisting of two sheets: Figure 1 isa sectional elevation in line 11, Fig. 2, of a carbureter em' bodying the invention. Fig. 2 is a sectional elevation thereof in line 2 2, Fig. 1.

Like reference characters refer to like parts in the several figures;

A represents the constant level gasolene or float chamber of the ca'rbureter, B the valve actuated by an annular float C in the float chamber for controlling the level of gasolene in the float chamber, D the main air inlet. passage; E the main gasolcne supply nozzle located in a contracted portion of the air inlet passage and communicating by passages c with the float chamber, c the adjustable needle valve of the nozzle, F the auxiliary air inlet passage controlled by the auxiliary air admission valve G, H

the air and gasoleue mixing chamber to which. the main and auxiliary air inlet passages lead and which connects by a (118- eharge passage I with .the engine, and K the throttle valve, located between the gasolene nozzles and the discharge passage I, preferably in the inixing'chamber H. While these parts are preferably constructed and arranged as shown in the drawings and, with the exception of the auxiliary air valve, are substantially the same as disclosed in United States Patent No. 943,242, granted Dec. 14, 1909, to Fergusson and Sheppy, assignors, this construction is not necessarily essential to the invention and the parts could be of other suitable construction and arrangement f The auxiliary air valve preferably 0on sists, as shown,of two or more spring strips or reeds g controlling slots or openings g j opening movement of the reeds.

in the walls of an incio'sing casing. These reeds have dillerent degrees of resiliency, so that they are opened one after another as the suction increases and thus effect a gradual admission of the air.

9 are spring tongues for limiting the v The admission openings aresurrounded by a fine mesh screen 5 for preventing the entrance of dust.

L represents the supplemental gasolene'or fuel nozzle which is connected by a suitable passage Z with the float chamber and is arranged with its discharge orifice at a point between the auxiliary air admission valve and the throttle valve, preferabl in the auxiliary passage F, and at a suita le elevation above the discharge orifice of the main nozzle E. The discharge from this nozzleis controlled by an adjustable needle valve Z which for convenience passes upwardly through the carbureter casing and is provided at its upper end with a head for turnin it. 2 indicates a spring detent engaging the serrated head of the needle valve for releasably holding it in adjusted positions.

The supplemental nozzle can be constructed and arranged between the auxiliaryair valve and the throttle valve in any suitable way, and any suitable regulating; valve, therefore can be used.

\Vhen the engine is running slowly the auxiliary air valve remains closed and the air passes up through the main air inlet iassa e D ast the main asolene nozzle E v so that the gasolcne is caused to flow forcibly from this nozzle by the suction and mixes with the air as it passes through the throttle valve and mixing chamber in the usual manner. As the throttle valve opened wider and the engine speeds up. the increased suction opens the auxiliary air valve and air is taken in through'this valve and the passage F above the main nozzle. This reater suction, together With the action 0 the air in flowing through the passage F past the sup plemental nozzle. draws msolene from this nozzle, in additici to ,l-fxii iiluil'lg supplied by the main nozzle E, thereby furnishing the increased quantity of gasolene required for higher speeds of the engine. This arrangement enables the supply from the main nozzle'to be adjusted small enough to insure good running at slow speeds, the supple mental nozzle serving it supply the additional gasolenenecessary for faster speeds.

By reason of .thedescribed location of the supplemental nozzle between the 'throttle valve and the auxiliary air admission valve having a plurality of admission ports which areopened one after another as the suction increases, the supply of gasolene is increased gradually in accordance with the increasing speed of the engine, and the mixture will.

speeds and too lean fuel chamber, a plurality of auxiliary air' admission valves which are opened in succession by the suction of the engine with which the carbureter is connected, at supplcmental fuel-Suppl nozzleiarranged 1n the path of the air a itted by said auxiliary air valves, said supplemental fuel'no'z zle being connected at its inlet end only with said fuel chamber and adapted to discharge fuelonly, the discharge end of said supplemental fuel nozzle bein at a higher elevation than that of the main fuel supply nozzle and constantly open, and a throttle valve located between both of said fuel nozzles and the discharge passage of the carburetcr for controlling the mixture from both ofsaid fuel supply nozzles.

2. In a carburetor, the combination of a liquid fuel chamber, means'for maintaining asubstantially constant fuel level therein, main and auxiliary air supply passages, a fuel nozzle arranged in the mam air supply passage and connected with said fuel chamber, a plurality of valves which control the admission of air to said auxiliary air passage and are opened in succession by the suction of the engine with which the carburcter is connected, a supplemental fuel su ply nozzle connected at its inlet end 0 y with said fuel chamberand adapted toidischarge fuel only. the discharge end of said supplemental fuel nozzle being located in -said auxiliary air passage and at a higher elevation thatthe discharge end of the main fuel supply nozzle and constantlyopen, adjustable means for regulating the maximum discharge of saidsupplemental fuel nozzle and a throttle valve located between both of said fuel nozzles and the discharge passage cf the carburemr for controlling the mixture from both of said fuel supply nozzles.

3. In a carbureter,-the combination of a, liquid uel chamber, means for maintaining autis llj constant fuel level therein, supply nozzle arranged in a main air passage and connected with said fuel '3 plurality of auxiliary air a d :n values consisting of independently n oivrble spring strips oi? different tensions whit-here opened in succession by the suction of the engine with which the carburetef is connected, a supplemental fuel supply nozzle arranged in the path of the air'admitted by said auxiliary air valves, said suppleniental fuel nozzle bein connected at its inlet end only with saiduel chamber and adapted to discharge fuel only, the discharge end of said su iplemontal i'nel nozzle being at :1V higher elevation than that of the main fuel supply nozzle and constantly open, and a throttle Valve located between both of :0 said fuel supply nozzles and the discharge passage. of the carburetor for controlling the mixture from both of said fuel supply nozzles.

' Witness myhand this 29th day of July, :5 1912.

CHARLES L. SHEPPY.

Witnesses:

' "WILLIAM H. Looms,

M. G. EWALD.

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