US1477280A - Carburetor for internal-combustion engines - Google Patents

Description

Dec. 11,1923. 1,477,280 v D. FORDES CARBURETOR FOR INTERNAL COMBUSTION ENGINES Filed Aug. 6, 1920 Q Patented Dec. 11,1923.

FAT

DORE FORBES, F VIENNA, AUSTRIA, ASSIGNOR T0 FA. P. S.-VERGrdSER-UND APPA- RATEBAU-AK'IIENGESELLSCHAFT, 0F VIENNA, AUSTRIA.

Application filed August 6, 1920. Serial No. 491,817.

Toall whom'it may concern: Be it known that I, Donn Ponons, mechanical engineer, a citizen of the Republic of Austria, and resident of Vienna, V. Mar-- garetenstrasse 105, Austria, have invented new and useful Improvements in Carburetors for Internal Combustion Engines (for which I hav filed applications for atents in Austria, filed March 9, 1917; ermany, filed March 16, 1917 andItaly, filed June 27, 1919), ofwhich thefollowing 1s a specification.

My invention relates to carburetors for internal. combustion engines of the type, in which the introduction or injection ofthe fuel into the air passage is regulated in accordance with the working of the engine.

One obj ect is to effect improvementsin th construction of the butterfiyvalve arranged in the air passage or intake pipe. A further object of my invention is to provide means to supply the fuel to a central chamber or bore of this valve, and to cause the fuel to be atomized and initially mixed with air while passing through said valve into the intake pi e. e I p With t e above and other objects in view, the invention'consists in the construction,

combination and arrangement of devices hereinafter described and claimed;

In the accompanying drawing, in which a preferred fgrm of the invention is shown.- Fig. 1 is a vertical section of the same.

' Figs. 2 and 3 are detail sections respectively showing the butterfly throttle valve in closedand open positions.

In the drawing, a indicates the float tank, 7) the float, c the fuel pipe, 6 the usual intake pipe to the engine manifold, d the air intake tube located above the tank and 7f the throttle or butterfly valve, thickened in the center and having oppositely bevelled side walls which converge forwardly and rearward'ly as shown. Said valve'has the usual operatinglever r, and has upper and lower tubular axes g, h. The lower part 71- reaches downwardly into the float tank and has at the lower end the fuel intake noz- Zle i.

The body of the valve is provided with two co-axial suction ducts m and n and with a duct 0' inclined to the axle. .All these ducts communicate with a central bore in the valve, as does also the vertical axial duct 71-. A. slide valve Z operates in said bore, has its lower end bevelled on one side, and also has an operating rod provided with a hand wheel 72.

The 0 eration of the carburetor is as fol-' lows 11 starting the engine, the throttle valve f (Fig. 2) is closed, suction taking places through the duct '11., so the fuel rlses through the nozzle 2' and the axial pipe 71., into the middle hole or bore of the butterfly throttle valve'. The fuel supply is regu-' lated by the air flowing through the duct m. Withthe parts in the position shown in Figure 2 which is the position the parts occupy In starting or idling, the passage n serves as a mixture outlet passage from the fuel passage it while the passages 0 and we admit air to said fuel passage. With the parts in the position shown in Figure 3, which is the position the parts occupy when the motor is running at high speed, the passages n and 0 both serve as mixture outlet passages while the passage m alone is an air inlet to the fuel passage 72.. It will be obvious that with the parts in the position shown in Figure 3 with less air admitted to the fuel passage h and a greater mixture outlet area the flow of fuel from the passage Z will be greater.

Having now particularly described and ascertained the nature of my invention,- what I claim is:

1Q In a carburetor, an. intake pipe, a butterfly valve in said intake pipe and having a vertical central bore, and a fuel intake duct leading downwardly from said bore, said valve having a fuel duct leading from said central bore'toward the discharge end of the pipe, an air duct extending from said bore toward the intake end of said pipe, and a duct either wholly or partially while the air duct is closed.

2. In a carbureter, an intake pipe, a butterfiy valve in said intake pipe and having a vertical central bore, and a fuel intakeduct leading downwardly from said bore, said valve having a fuel duct leading from said central bore toward the discharge end of the pipe, an air duct extending from said bore toward the intake end of said ipe, and a third duct extending from said re to one side of said valve, said ducts being arranged with their ends which communicate with said bore in a common plane, and a slide valve movable in said bore and having its lower end bevelled on one side tothereby adapt said slide valve to be employed to open or close said air duct either wholly or to any desired extent and to also close said third duct either wholly or partially while the air duct is closed.

3. In a carburetor, an intake pipe, a butterfly valve in said intake pipe, said valve having a thickened central portion and bevelled side walls which conver e forwardly and rearwardly toward each ot er from the said central portion and toward the. respective ends of said valve, and also having a vertical central bore, and a fuel intake duct leading downwardly from said bore, saidpipe, an air duct extending from said bore I toward the intake end of said pipe, and a third duct extending from said bore to one side of said valve, and means to open or close said air duct either wholly or to any desired extent and to also close said third duct either wholly or partially whilethe air duct is closed.

In testimony whereof I aflix my signature in presence of two witnesses.

INGENIEUR DORE PORDES. Vitnesses:

GUIDO CORNI, RUDOLF SCHISKE.

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