US1672923A - Carburetor - Google Patents

Description

`)une 12, 1928.

ll. R. zARRAclNA CARBURETOR Filed Nov. 29, 1922 2 Sheets-Sheet PATENT OFFICE.

ISIDRO RODRIGUEZ -ZABRACINA, 01E*` VALLADOLID, SPAIN.

CARBURETOB.

Application led November 29, 1922, Serial No. `604,028, and in Spain May 12, 1922.

This invention relates to an improvement in or modiiication of the invention described in my prior Patent No. 1,523,095 of Jannary 13, 1925. v

5 ln the said patent the throttle valve 13 of the carburetor is provided Withan extension or tail secured thereto vghicli is provided With a valve adapted 4to close an additional4 air supply passage, so as ,to control tbe suclo tion at the jet or nozzle, when the throttle valve is fully open.

According to the resent invention the throttle valve is repaced by a butterfly valve, to the spindle of which there is selo cured a shutter, which, when the butterfly valve is lulligr open, closes the additional air .supply passage in order to control the suction at the main jet. 'llie principle olf enricbiznCr tbe mixture according to the present il@ invention is the same as in niy'earlier appli rations, but solely when tbe throttle valve is in the lullig; open position.

The invention will now be described with reference tbe accompanying drawings wliereingm lilies l longitudinal sectional elevation the carbureton o, sectional. view taken. about on by the liuc 2N2 of Botanical plan, and

show sections with the shut- El is the main giet:-Il with ff, is supplied with constant level in the outlet orilice ol the chamber ol beans oi' a tubular 1 i ,v los? ple todo@ stel tfno w ocation with ntspliere by s ll c supply or additional. tabular oienibor and the inA e is provided the d to close the when the throttle In the upper part of the carburetor is Y mounted a rotary valve 21 in which a passage 5 adapted to register with the passage 5 is provided. The valve 21 is also provided with a groove or recess`26 adapted to connect a passage 22 with a passage 25, for the supply of air when the engine 1s running at a slow speed. The angular movement oi' the valve 21 is limited by a set screw 28 engaging in a groovel?.

The shutter 15 is provided with an extension 29 through which passes a set screw 30, with a lock nut, which shutter is used for idle running and for limiting the opening of the throttle valve.

The parts of the carburetor having thus been described, the operation thereof is as opening 16 for slow running. By reason ofV the strong suction around this opening lair will be drawn tlirouglivtbe opening 2U and at the same time a powerful suction action will be produced around the 'lool nos als lll for sloiv running., The :Enel f niso in the passage 18. A .suction action will also occur, at the same time., in tbe 22.l and the degree of suction intliis'passege con he varied. by varying tbe position ci the valve 21, the position ol this valve allowing more or less air to pass ifreely through tbe ,groove 26 and the opening 25. p lt be that in this .manner suction around tile jet or :liceale 19 for slow ruining can be controlled accurateliff and the best result for slow running tlrus obtained. The com ensating opening 2O is adapted to avoid, sud en changes in the suction between idle running and slow running under small loads, and the action of the opening ceases when the edge of the throttle valve opposite the opening 20.

Willian the throttle valve is being @period lill Athrottle valve 13, a s shaft of the throttle valve, this shutter befor the purpose of increasing the power of the engine, the suction in front of the openings 16 and 20 decreases, but increases around the tubular member 2 so as to roduce an intimate mixing of the the fliiel, which passes from the jet or nozzle 8, and the air, drawn through the passage 5 and the tube 6, in the well 4. This mixture, which is finel vapourized, passing into the mixing cham er 3 through the openings 7 in the tubular member 2. As these openings are disposed over the Whole periphery of the tubular member 2, a second vaporization is produced in the latter b reason of the fact that in consequence of t e cinetic energy of the air, this latter passes into those openings 7 facing the main air inlet, then out through the lateral openings and those facing toward the engine intake. The mixture which has now been vapourized twice, is again vapourized for the third time on its passage into the mixing chamber 3, so that an air-fuel mixture is formed which is extremely eliicient for good combustion.

As long as the throttle valve 13 is not moved into its fully open position, the passage 5 remains open and air can pass therethrough into the fuel well 4, the passage of air being controlled by suitably positioning the valve 21, so that a mixture is formed which is found to be the most suitable for an economical running of the engine. Underl these circumstances and by reason of the position of the jet or nozzle 8 and the energetic assage of the main stream of air through t e mixture passing through the openings 7, it will be seen that as the speed o the engine increases the proportion of fuel and air in the mixture will not remain constant, but the proportion of fuel will be reduced as the speedl of the engine increases so that the engme will run more economi- Ays however, it is of great importance to be able to obtain from the en e, at any moment, with the admission fu ly open, its maximum eiciency byl simply operating the utter 1s keyed to the ing adapted to close completely the passage 5 when the throttle valve is fully o en (Fig. so that the action controlle by the va ve 21 ceases as air is prevented from passing into the fuel well 4, and consequently more fuel will be drawn in so that a richer mixture is produced which contains the required amount of fuel for running the engine at a higher efficiency.

The well 4 and tube 6 form a liquid seal which it would be diicult to overcome b weak suction actions roduced when runnmg at low speeds an the throttle valve should be o ened quickly; in order to overcome this iculty and to remove the liquid seal quickly, the shaft of the valve 21 is provided with a constrictedpassage which allows a constant quantity of air to pass into the well 4 independently of the position of the shutter 15.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed I declare that what I claim is 1. A carburetor including a vcasing* provided with a main passage and a fuel well, an atomizng tube extending transversely of said passage to said well-and having discharge outlets into the passage, a main fuel nozzle in said well, a by-,pass separate from the atomizng tube and opening at one end laterally into the .main passage and at the other end into the well adjacent the main fuel nozzle, so as to supply fuel to said passage during idling operation, and an auxiliary air passage extending through the atomizng tube to said well so as to sup ly air to both the atomizng tube and the E pass, and throttle means in the main passage including means to control the auxiliary air passage when the by-pass is inoperative. i

2. A carburetor including a casin provided with a main passage and a fue well, a main fuel nozzle in said well, a by-pass in the wall of said casing communicating at one end with the well adjacent the nozzle and at the other end opening laterally into the main passage, a branch passage communicating with the by-pass at one end and with the atmosphere at the other end, an idlin nozzle disposed at the juncturel of the y-pass and said branch passage, an auxiliary air tube extending through the casing to the well, and a valve member common to the branch passage and said auxiliary air tube.

3. A carburetor including a casing provided with .a main passageand a fuel well, an atomizng tube extending transversely of said passage to said well and having dischar e outlets into the passage, a main fuel nozz e in said well, a ly-pa separate from y the atomizng tube an opening at one end laterally into the main passage and at the other end into the well adjacent the main fuel nozzle, so as to supply fuel to said passage during idlin operation an auxiliary air tube mounted 1n the atomizng tube and substantially spaced therefrom to rovide passage therebetween, a passage in t e casing communicatinor with the air tube and having an air intxilie, a throttle member in the main assage, and means movable with the thrott e member to coact -with the air intake of the passa to the air tube in certain positions of t e throttle, said throttle member beingdisposed to coact with the said opening of t e by-pass into the main passage in certain other positions of the throttle whereby the richness of the fuel mixture may be regulated under idling, normal running, and heavy load conditions by varying the positions of the throttle.

4. In a carburetor,'the combination with fuel supply and mixing means and an engine intake-discharge port therefor,l of a control valve `for said port, a rock shaft for actuating the valve, an air intake port for the mixing means extending substantially parallel to the intake-discharge and having an exposed inclined terminus adjacent the shaft, and a closing member having a face inclining oppositely to the inclination of the air intake port and carried by the rock shaft for closing the air intake port as the shaft is oscillated toward the maximum open position of the control valve.

5. The combination,with carbureting Yapparatus for internal combustion engine fuel, a control valve therefor, and an actuator for the control valve, of an air suppl tube communicating with the interior of t e carbureting apparatus for assistin in attenuating the fuel being carburete the said tube having an inclined exposedintake terminus, and a closure 'for said terminus having a corresponding, opposite incline actuated by the control valve actuator to move in the arcuate path to and from a position contacting with and closing the intake end of said tube.

In .testimony whereof I aiiix my signature.

ISIDRO RODRIGUEZ ZARRACINA.

Images