US1883809A - Carburetor - Google Patents

Description

oct. 1s, l1932.

M. MENNEssoN CARBURETOR Filed Sept. 8, 1951 4 Sheets-Sheet l Marce! Mezzzzas'on Oct. 18, i932,

M, MENNESSON 1,883,809

CARBURETOR 4 Sheets-Sheet 2 Filed spt. v8, 1931 T" @Mm @at l; 1932. M. MENNEssoN GARBURETOR Filedvsept. 8', 1931 4 Sheets-Sheet 3 f l N l Il ffamy.- @www Det. 18, 1932. M. MENNEssoN 1,883,809

GARBURETOR Filed sepas, 1931 4 sheets-Sheet 4 Patented Oct; 18, 1932 UNITED' STATES PATENT OFFICE MARCEL MNNESSON, 0F NEUILLY-ON-THE-SEEINE, FRANCE, ASSIGNOR TO SOCIETE CARBUBETOB Application led September 8, 1931, Serial No. 561,749, and in Belgium Iune, 1981.

The v resent invention relates to carburetors, an more particularly, to those of the type wherein a small auxiliary carburetor cooperates vvith the main carburetor assembly during starting and operation with a cold motor.

@ne of the objects ofthe invention is to provide a carburetor assembly in which means aro provided for preparing the main nozzle for operation as soon as the auxiliary carburetor is cut out.,

nAnother object isito so position the feed orice communicating with the auxiliary car buretor that the explosive mixture enter= ing the intake manifold is properly distributn ed to the various cylinder vlilurther objects will appear inthe course of the detailed description now to be given with reference to the accompanying draw ings, in whichz` l Figure is a section taken on line 1-1 of Figure 2 to be described and showing one illustrative embodiment of the invention;

Figure 2 is a side view of the structure represented in Figure 1; 1

F'gures 3 and t are sections showing cer= 'tain details of the assembly illustrated in a system of conduits such as those shown` in Figure 1; a main nozzle 3 also supplied with fuel from the constant level chamber, this nozzle being of any desired type, but preferably of one such as is represented in igure 1; an auxiliary mixing chamber l positioned above nozzle 2; a main mixing chamber 5 receiving fuel from nozzles 2 and 3; a butterdy or similar type of throttle valve 6 mounted so that, in closed position, it completely closes mixing chamber t and covers y duit 13 provided with an emulsifying air inlet 14, amixing chamber 15, a passage 16 communioatingat one extremity with main mixing chamber 5 at a point downstream ward with relation to throttle valve t, the point of communication with mining chamber 5 being positioned to lie aloneV1 the anis of symmetry of an intake manifold 36 having branches 3'? and 38 each feeding a like number of cylinders, passage 16 being formed so as to be able to communicate with chamber 15 under conditions to be descrild, a shaft 17 of square or polygonal section rotatably supported in a pair of journals 19 and 20, a lever 13 rigidlyattached to shaft 17 and connected to theA dash board by any convenient form of transmission (not shown), a cover element 21 provided with a pair of air intake orices 32 and 33, a plate 22 having a central opening therein ofsquare or polygonal form adapted to t over the correspondingly sha ed portion of shaft 17, late 22 having a rst elongated opening v 2 (Figures 3 and 4) formed therein and adapted to control communication between chamber 15 and passage 16 when shaft 17 is rotated, plate 22 being further provided with a circular orifice 28 a passage 29 having one extremity positioned to communicate with mixing chamber 5 at a point upstreamward with relation to throttle valve 6 and having its other extremity positioned to communicate with chamber 15 via orifice 28 in a manner to be described, a second plate 23 also having as uare or polygonal central orifice formed t erethrough coacting with correspondingly shaped portions of shaft 17, plate 23 having a pair of openings 3G and 31 positioned to move acrossair intake passages 32 and 33 when shaft 17 is rotated, a machined lateral surface 24 covering the face of plate 22 and a second machined surface 25 covering the face of plate 23, a. spring 26 tending to apply plates 22 and 23 firmly against surfaces 24 and 25, and a plug 35 having an air inlet passage 34 positioned to communicate at opposite extremities with the air and with chamber 15.

The hereinabove described assembly oprates in the following manner:

Assuming the motor to be cold and at-rest and throttle valve 6 in closed osition, that is to say so as to completely block mixing chamber 5 and partially cover the discharge orice oi auxiliary mixing chamber 4 (Figure 1), and that it bey desired to start the motor While cold and to maintain the latter in rotation until warm, lever 18 is displaced so as to rotate shaft 17 and bring plates 22 and 23 into the position shown in Figures 1 and 3. Main mixing chamber 5 is then in communication with chamber 15 via passage 16 and oriiiee 27, while, at the Sametime, chamber 15 communicates with main cham ber 5 downstreamward of throttle valve 6 via passage 2C and orifice 28. At this stage, plate 23 cuts olf communication between chamber 15 and air inlet passages 32 and 33, while passage 34 continues to supply air from the atmosphere to said chamber. If the position. and dimensions of the various passages and oriiices as well as the design of elements 12, 13 and 14 are chosen to give a proper mixture during cold operation and slow speed, the motor will at once start when turned over, the supply of fuel from orifice 8, will be dependent on the duid pressure transmitted from the constant level chamber and the carburetion will vary automatically in accordance with the changes of speed of the motor resulting from the diminution of its internal resistance (varying viscosity of the oil, etc.). The form, dimensions and position of the various passages communicating with chamber 15 permit regulation of the transition in operation from the auxiliary'carburetor assembly to the main carburetor assembly. Inasmuch as chamber 15 communicates via passages 16 and 29 with opposite sides of the throttle valve, it'creates a depression in the malumixing chamber tending to maintain prinelpal nozzle 3 ready to supply fuel as soon as the throttle valve is opened. In order to insure a gradual transition, when ,shaft 17 is rotated to cut out the auxiliary carburetor assembly, air inlets 32 and 33 and orifices 30 and 31 are positioned so as to replace the air formerly entering via passage 29 and orice 28. As soon as shaft 17 is turned so as to cut 0E communication at 28-29 and 16-27, the auxiliary carburetor no longer supplies fuel to mixing'hamber `5. At that time, passages 30, 32 and31-33 establish communication between chamber 15 and the atmosphere. If, because of leakage, art of the depression in main mixing cham er 5, is transmitted to chamber l5, the opening of passages 30-32 and 31 prevents fuel being fed from conduit 13.

Figure 3 shows, in full lines, the relative position of orifices 27 and 28 relatively to passages 16 and 29 when shaft 17 is in open position (Figure 1). At that time passages 32 and 33, shown in dotted lines, are out of alignment with orifices 30 and 31.

Figure 4 shows the position of the various operating elements when shaft 17 is turned into closed osition, oriiices27 and 28 (dotted lines) being out of line with passages 16 and 29, while passages 32 and 33 (full lines) are in alignment with orifices 30 and 31.

The form of carburetor represented in Figures 5 and 6 differs from the one already described only in that mixing chamber 5 lis horizontal rather than vertical. This carhuretor assembly functions substantially in the same manner as the one illustrated in Figures 1 to 4.

In practice, it is found that the mixture entering the main mixing` chamber through passage 16 arrives under considerable velocity and that, unless the discharge end of passage 16 be positioned along a plane of symmetry bisecting elements 36, 37 and 38, the mixture is not evenly distributed among the cylinders.

In the claims that follow the term a conduit system is meant to include elements 16. 15 and 29. Y

What I claim is :-T

1. In combination with a carburetor provided with a main nozzle, a main mixing chamber and a throttle valve controlling said mixing chamber. an auxiliary carburetor assembly comprising a chamber. passages communicating at opposite extremities with said chamber and with said main mixing chamber at points positioned on opposite sides of said throttle valvewhen the latter is in closed position, said chamber communicating with the atmosphere, means operative by the depression in said main mixing chamber to aspirate fuel into said chamber of said auxiliary carburetor assembly, and a valve assembly operative to control communication between said passages and said chamber, said chamber having additional communication to the atmosphere comprising a passage positioned to communicate at one extremity with the atmosphere and at its other extremity with said chamber via said valve assembly.

2. In combination with a main carburetor assembly including a main nozzle. a main mixing chamber, an auxiliary nozzle, an auxiliary mixing chamber communicating with said main mixing chamber, and a throttle valve simultaneously controlling said mainpassagesvv communicating at opposite extremities with said chamber and with said mainV mixing chamber at-point-s situated on opposite sides of said throttle valve when the latter is in closed position, said chamber communicating-with the atmosphere, means opconstant level chamber, a main mixing chamber ositioned to receive fuel discharged from sai main nozzle, and a throttle valve positioned inside said main mixing chamber, a

conduit system having a pair of terminal oriiices positioned to communicate with said main mixing chamber at points situated on opposite sides of said throttle valve when the latter is in closed position, a passage communicating at opposite extremlties with the atmosphere and with said' conduit system, a well communicating with the atmosphere and supplied with fuel from said constant level chamber, a tube communicating at opposite extremities with said conduit system and with 'the fuel contained' in said well, a second passage positioned to communicate at opposite extremities with the atmosphere an with said conduit system. and a valve operative 40 to simultaneously control communication between said second passage and said conduit system, and between said main mixing chamber and portions of said conduit system.

4. In combination with a. main carburetor assembly including a constant level chamber, a main nozzle provided with fuel from said constant lev l chamber, a vmain mixing chamber positioned to receive fuel discharged from said main nozzle, and 'a throttle valve positioned inside said maixr'mixing chamber,

a conduit system having a pai1`7,\of terminal orifices positioned to communicate with said main mixing chamber at points Asituated on opposite sides of `said throttle valve when the latter is in'- closed position, a passage communicating at opposite extremities'with the atmosphere and with said conduit system, a-

well communicating withthe atmosphere and vsupplied with fuel .from said constant level chamber, a tube communicating at opposite extremities with said conduit system and with thefuel contained in saidfwell, a sective to simultaneously cut o communication between said last named passage and said conduit system and to establish communication between said main mixing chamber and portions of said conduit system, said valve being also operative to establishv communi-V cation between said last named passage and said conduit system while cutting oif com- .munication between said main mixing chamber and portions of said conduit system.

5. In combination with a main carburetor assembly including a constant level chamber,

a main nozzle communicating with saidconstant level chamber, a main mixing chamber positioned to receive fuel discharged from said nozzle, and a throttle valve positioned -inside said main mixing chamber,-an auxiliary carburetor assembly comprising a well communicating at 'opposite extremities with the atmosphere and with said constant level chamber, a tube extending into said well and having a free yextremity positioned to lie -below the level of fuel contained in the latter, a chamber communicating with said tube,a first passage extending from said chamber to a point in the wall of said main mixing chamber situated upstreamwar'd with relation to said throttle valve, a second passage extending from said chamber to a point in the wall of said main mixing chamber situated downstreamward with relation to said throttle valve whenl the latter is in closed position, a third passage communicating at opposite extremities with the atmosphere and with said chamber, a disc mounted inside said chamber and having oriices formed therethrough positioned to move across said first and second passages at the points where the -latter communicate with said chamber, and means for'rotating said disc.

6. A structure as defined in claim 5 in combination with an auxiliary nozzle, and an auxiliary mixing chamber communicating with said nozzle and with said main mixing Y chamber.

7 A structure as defined in claim 5in combination with a second disc mounted inside said chamber and having an orifice formed therein positioned to move across said third passage, said second disc being rotatable by said last named means.

8. A structure as defined in claim 5 in combination with a `second disc mounted insidev said chamber and having an orificeA formed therein positioned to move across said third passage, said second disc being rotatable by said last named means, and a spring tending to move said discs apart.

In testimony whereof I aix my signature.

M. MENNESSON.

ond passage positioned to communicate at opposite extremities with the atmosphere and with said conduit system, and a valve opera-

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