US1517666A - Carburetor - Google Patents

Description

Patented Dec. 2, 1924.

am cozm'rn, or coUBBEvm, manor.

CABBUBETOR.

Application led June 86, 192i).-` vSeriali No. 393,080.

(GRANTED UNDER THE YRUVISIUHS 0l' TRE AQT 0F MHCK 3, 1821, 41 STAT. l.'..,1313.)l

To all whomz't may concern:

Be it known that I, REN CozE'r'rE, a citizen of the French Republic, and resident' 38 Rue Victor Hugo, Courbevoie, Seine,

of France, have invented certain new and useful Improvements in Carburetors (for whichl have filed an application in France October 29, 1915, Patent No. 524,811, May 20, 1921A), of which the following is a specification.

The present invention relates to a 4carburetor for internal combustion engines the compensated by an essential characteristic feature of the invention being the combination of two nozzles the discharge of fuel from one of which at dierent speeds of the motel' or engine is inversely proportional increase in` the su ply of. fuel fromthe 'other nozzle the result Ain that the two nozzles always supply a suita le percentage of fuel in accordance with the requirements of the engine or motor.

In the present carburetor the main nozzle feeds in proportion to the suction andis adjusted so that it' ensures by itself the fuel necessary for high engine or motor the auxiliary nozzle at this ltime being more or less inoperative or delivering very little if any fuel. Qn the contrary when vthe engine or motor speed decreases,V or when under the effect of increased load or from any other cause, the speed of the engine or motor decreases the fuel feed from the main nozzle becomes very slight in order to give vnormal carburation,V the auxiliary nozzle then becomes automatically operative to compensate for the defective fueljfeed from the main nozzle.- feed., from themain nozzle is almost nil, whilst the auxiliary nozzle feeds almostlthe i entire amount of fuel necessary. for carl plyiug with these conditions buration. InV other' Words the auxiliary nozzle acts as a compensatin device for the supply of fuel which supp y is -inversely proportional to that of the main nozzle.

A yconstructional form of carburetor comis illustrated by way of example in the accompany' drawing which shows a vertical longitudi- 0 nal section of a carburetor in accordance with the present invention. i.

Referring Ito the drawing thecarburetor comprises two nozzles 1, 2 dis concentrically with and at the cen ie' oflthe' speed, v

.to the bottom At lower speeds the mixing tube 3, its main nozzle 2 communieating directly with a feed passage 4 delivering liquid fuel from a constant level A float chamber' 5, whilst the auxiliary nozzle 1 is supplied by a branch passage 6 fed with liquid fuel from an intermediate chamber 7.

. The chamber 7 communicates by a tube 8'provided with a numberof staggeredly arranged holes 9, with the main feed pas- Sage 4. A cap 10 having a central air vent 10'* isprovided so as to close the tube 8` but still allow of communication of the tube 8 with the atmosphere. The chamber 7 is itself in communication with 'the atmosphere through the space between the cap 10 and the wall of the chamber, so that the liquid in the chamber .7 and the tube 8 always tends to stand at the same level.

' The removable plug 11 provided with an opening of definite section, is disposed in the feed passage lat a point where the latter is branched fro the float chamber 5. This calibrated plug 11 has for its object to produce a resistance tothe escape of the liquid and consequently to create a depression in the feed passage 4 thereby lowering the level of the liquid fuel in the tube 8 relatively to the buretor.

The calibrated opening in the plug 11 is chosen for a motor Yor engine of definite power so that when the motor or engine rotates atits maximum sed the level of the liquid fuel in the tu 8 is adjacent part ofthe said tube, the level of the liquid fuel tending to rise in the tube 8 as the speed of the engine or motor decreases.-

The action is as follows:

When the motor or engine rotates at high speed the. suction produced in the mixingtube 3 determines the amount vof liquid jdis char this

` of fuel through When the speed of the motor or engine decreases from any cause whatsoever the suction effect is obviously vreduced and the feed from the main nozzle accordingly decreases, resulting in a decrease in the speed at which the liquid fuel escapes into the passage ,4 and consequently the liquid fuel rises in the tube 8 and passes through the holes 9 therein into the chamber 7 the number of holes immersed gradually increasing as the liquid rises in the tube. vThe holes 9 therefore form so many nozzles the' passage which during action is dependent on t e height of the level of the liquid fuel in the tube 8. In some conditions suchas when the level falls in the tube 8 under the effort of increased motor or engine speed a certain number of the holes cease to feed, thereby diminishing the total feed from the auxiliary nozzle 1, thus correcting and compensating inversely and automatlcally the increased feed from the main nozzle 2 which feed would tend to become excessive. On the contrary when the speed of 'the motor or engine decreases, the supply from the nozzle 2 accordingly decreases and would not supply a sufficient quantity of liquid fuel.4 The liquid fuel then rises in the tube 8 in consequence of the decreased suction effect in the passage 4, a certain number of holes 9 being thus.

covered by the body of liquid fuel rising in the tube 8 and ready for feeding thereby increasing the supply or' feed from the auxiliary nozzle which corrects and compensates for the defective Carburation from the main nozzle.

A carburetor as hereinbefore described always permits of a considerable percentage of the liquid fuel in the carburetted mixture, whatever may 'be the motor or engine speed. Further its application is easy because, the desired Carburation for each motor or engine can be obtained in accordance with its speed by increasing vor decreasing the number or the diameter of the holes in thel tube 8, immediately below the line of level decided on for any particular speed of the motor.

In particular, the richness ofthe mixture can be increased or decreased for low motor or engine speeds in order to avoid the phenomena known as hang-fire which is produced in the induction pipes when the column of induced mixture is throttledin the carbuetor, resulting in decreasing the compression in the motor or engine.

" The' construction and arrangement hereinbefore described, the forms, clin'lensions, details of execution and applications may be varied without departing from the nature of the invention.

For example the two nozzles instead of,

being disposed concentrically could be spaced apart on two parallel or convergent axes and in the same pipe for the formation of the mixture.

Having now particularly described and ascertained the nature of my invention and in what manner the same is to be performed I declare that what I claim is 1. In .a carburetor, a mixing chamber, main and compensating nozzles arran ed in the mixing chamber, a constant leve fuel reservoir, a variable level fuel reservoir, a duct connecting the main nozzle with the constant level reservoir and the variable levelreservoir, the latter being open to the atmosphere and being connected with -the compensating nozzle, means for controlling the discharge of liquid fuel from the constant level reservoir, the connection between the compensating nozzle and the variable level reservoir having a variable cross sectional area.

2. In a carburetor, a mixing chamber, main and compensating nozzles arranged in the mixing chamber, a constant level reservoir, a variable level reservoir, a duct connecting the main nozzle with the constant level reservoir and the variable level reservoir, said variable level reservoir being open to the atmosphere and communicating with said duct and with the compensating nozzle, means for controlling the discharge of liquid fuel from the constant level reser voir, and means for controlling the supply of liquid fuel to the compensatin nozzle according to the height of the co umn of liquid standing in the variable level reservo1r.

3. A carburetor in accordance with claim 1 characterizing that the variable level reservoir of the compensatin nozzle comprises an annular space defined between a vertical cylindrical cavity and an internal tube concentric therewith, said annular space communicating with the compensatin nozzle and the lower part of the tube being connected to the duct of the main nozzle and being provided with stepped openings which, according to the number thereof immersed in the liquid fuel,- control the flow of fuel to the compensating nozzle.

REN GozE'r'rn.

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