US1971494A - Carburetor - Google Patents

Description

Aug. 28, 1934. A. LESAGE 1,971,494

CARBURETOR med April 1s. 1932 z sheets-snee: 1

Inventgr /a H76' Attorne s CARBURETOR Filed April 13, 1932 2 Sheets-Sheet 2 /'y I y Inventor Wald' f Atto me 5 1 @emum Patented Aug.` ze; i193.4

CARBURETOR Alfred Lesage. Schweinfurt, Germany Application April 13, 1932, Serial No. 604,911 In Germany April 22, 1931 1 omni.

The invention relates to atomizers in which the fuel for combustion engines is in the form of a jet admitted to a vaporizing chamber in which it is iinely subdivided and mixed with prima-ry l air, whereupon the mixture so formed is distributed through a number of nozzles intoa channel conducting supplemental air.

The object of the invention is to render'the atomizer adjustable in such a manner that the volume of the mixture and the ratio of air and fuel in the mixture can H.be regulated to suit the variations of operation and loading of the engine, e. g., starting, running light, partial or full load.

This object is attained by providing regulating means adapted to alter the volume of the primary vaporizing chamber and at the same time the admission aperture for the supplemental air as well as the suction ellect upon the spraying nozzle by the adjustment of slide valves, the said regulating means having a hand-operated controlling device.

AAn embodiment of the invention is illustrated -by way of example in the accompanying drawings, which form a part of this specification, and in whichg Fig. 1 is a vertical sectional view of the atomizing carburetor taken on the axis of the inlet passage of the secondary air,

Fig. 2 is a vertical section on a plane at right angles to the sectional plane of Fig. 1, and

Fig. 3 shows a modification of a detail.

Like numerals denote like parts throughout all figures of the drawings.

Below the air inlet paage 5 opening to the atmosphere and connected at its end 6 to the suction pipe of the engine is disposed the fuelspraying nozzle 'I which communicates with the float chamber by a channel 8 in the body 9 of the carburetor. The nozzle 7 extends into a tubular carburetor choke 10 which is mounted in the wall of the carburetor shell in any suitable way and may be of any cross section desired. The purpose of this choke is to provide a chamber for forming the preliminary combustible mixture. On the side lying in the direction of outflow of the air current, the choke 10 is provided with a number of perforations 11 through which passes the fuel atomized in the choke 10 and mixed there with air. A piston valve 12 in the formof al hollow plunger is slidable in the carburetor body 9 in alignment with the choke 10, and is pressed down towards the atomizing nozzle 7 by a spring 13. The said plunger is yconnected to a Bowden cord 14 by means of which it can be 55 raised more or less. l In its lowest position shown lstantially so that the fuel injected into the carin Fig. 1, it shuts oii the air passage 5 and closes the choke 10 from communication with the part 6 of the air passage and the suction pipe of the engine to be connected thereto. This closure additionally effected by a pin-like piston valvev 50 l5 moving within the choke 10 with sliding fit and connected to the plunger 12, so as to be moved simultaneously with the plunger 12 up and down and to close all openings l1 or some of them. 'Ihe pin 15 is pivoted to the plunger 12 by means of a gudgeon 16 but it may also be rigidly connected to the said plunger.

The carburetor operates as follows: l

In" the position of the plunger 12 as shown by Figs. 1 to 3 the air inlet 5 and the mixing or choke chamber 10 are fully closed against the suction pipe of the engine. When the plunger 12 has been raised until the two undermost perforations 11 have been uncovered by the pin 15 the bottom edge ot the plunger 12 is also at such a height above the bottom of the passage 5 that air can be taken in and flow past the choke 10. 'I'hen the mixture which is formed in the choke by the fuel injected by the suction through the nozzle 7 anda definite amount of air taken in through a vlateral bore 17 arranged in the body of the carburetor by the side of the nozzle, will pass through the perforations 11 of .the choke 10 and in this way get into the engine in the correct quantity and dilution, after being flurther mixed with the secondary air entering the passage 5. When the plunger 12 is raised very quickly by means of the Bowden device the pin 15 produces a partial vacuum in Vthecholre 10 so that the amount of the fuel drawn in is increased and the richer mixture necessary for a sudden acceleration is made available. When the plunger 12 is raised above the uppermost perforation 11 the same is also uncovered by the pin 15 and a groove 18 provided for on the bottom part of the pin 15 also uncovers an air inlet beginning above the top edge ofthe choke 10, so that the amount of air added is increased. A cut-out portion 19 of the plunger 12 on the side opposite to the perforations 11 facilitates the addition of air to the primary mixture leaving g the openings and the top end of the carburetor choke. Therefore a suitable mixture can be produced i'or the full load'oi' the engine. When, however, the plunger 12 is lowered until its bottom edge has arrived in the neighbourhood of the bottom of the air passage 5 and the .pin 15 uncovers onlythe lowest opening 11, the admission of the secondary air is throttled more sublos buretor choke 10 and the air entering through the bore 17 form a richer mixture as required by the engine for running light. This arrangement thus combines the main and pilot jets otherwise usual.

An essential feature of the working of the carburetor resides in the effect produced by the movable pin, as it not only varies the capacity of the primary mixing chamber or choke, thereby regulating the quantity of air and fuel sucked into the said chamber, but also presents an atomizing face to the entering jet of fuel at its lower end.

The modication shown by Fig. 3 diiers from the type above described by the fact that instead of the groove 18 provided for in the bottom part of the pin 15, a groove 20 is madein the top portion of the choke 10. When the bottom end of the pin 15 registers with this groove 20 the air passage is opened just the same as in the embodiment previously described.

V-Due to the novel arrangement of the carburetor which permits a complete closure against the engine and thus 'the same, the mixture can always be regulated as required by the operative conditions prevailing. This regulation is ensured solely by the two pistons 12 and 15 being displaced by means of the Bowden cord 14.

complete stopping of thev What I claim as my invention is- In a spray carburetor, the combination with an air admission channel, of a spray nozzle dis-l posed at the bottom of said air channel, a tube located in alinement with said spray nozzle and extending transversely of said air channel, and.

having a series of perforations along the length thereof, an air regulating slide valve encircling said tube and axially movable towards and away from said spray nozzle, and a plunger presenting a fiat lower end, said plunger being connected to said valve and slidable in said tube with a snug iit therewith, and extending across the entire cross-sectional area of said tube, and when in its lower position having a substantial portion of its lower end in close conforming contact with portion of the innerl surface oi the tube having said perforations, whereby the passage -of fuel from said spray nozzle and through the perforations of said tube is controlled byisaid plunger, and said perforations are covered or uncovered in succession as said plunger slides, whereby the at end of said plunger forms an atomizing face for the jet of Iuel, and whereby said plunger, in moving upwai d, creates a suction in the interior of said tube.

ALFRED LESAGE.

Images