US1700921A - Carburetor - Google Patents

Description

Feb. 5, 1929.

A.cHANARn GARBURETOR md July 2s, 1924 2 Sheets-Sheet 1 Fi g 1 Ybl -..Enig/s.

A. cHANARn 'f GARBURETR una mi 25. 1924 y Figli.

2 Shutvshnt 2 Patented Feb. 5, 1929. 'I

AUGUSTE CHANARD, F RUEIL, FRANCE.

cmunaron.

. appunti@ nien my za, 1924, serial no. 727,845, and in nance my as, 192s.

The present invention has for its object an improvement in carburetors for internal combustion motors, of that type comprising a series of carbureting chambers opening into a common header, and a controlling or obturating device which permits of the number of carbureting chambers put into action 4 being varied at will.

The vinvention is clearly illustrated in the accompanying drawings, in which; Fig. 1 is a longitudinal section of the improved carburetor; Fig. 2 is a' plan view, partly in horizontal section made at the level of the spraying orifices; Fig. 3 is a cross section made according to line `A---A of Fig. 1; Fig. 4 is a rear view.

y As illustrated in the drawings, the present carburation apparatus comprises a series of unitary carburation chambers a, a1, a2, a3,

a, a, a", a", a, completely independent from each other, freel communicating at one of their ends with the atmosphere, and opening at their other end in a casing or header b; the latter is provided at its end with a flange c on which is secured the pipe which connects it with the suction manifold of the engine.

' Each of these 'carburation chambers referablyhas internally, the shape of a' enturi tube, according to the profile illustrated in Fig. 1, and has an excessively reduced cross section; the first chamber, adapted as indicated hereafter to feed the engine in the case of slow speed running, has, in its throttled portion, a diameter of about two millimeters;

the diameter of the throttled portion of the other Carburation chambers can have about six millimeters.

In the throttled portion of each 'of the carburation chambers a, a1,.a2 opens a tube at the end of which is mounted, 'as shown in Figs. land 3, a plate provided with a calibrated hole e, e1, e2 .l having for instance adiameter of 5 tenths of .a milli- -meterf; each o f the tubes d, d1, d? istcoupled to a pipe f, f1, f2 connecting it to 'the asoline reservoir g which can be placed on the vehicle lower than the carburation apparatus at 'any distance and at anylevel.

Within the casing b is introduced with slight friction, a valve h., in the form of a cylindrical body having a bore It and which body can be moved in the-longitudinal direction either directlyby hand, or through the medium of an control device.

In one of 1m extreme positions Fig.,1) this valve body uncovers solely the rst carburation chamber a'corresponding, as above stated, to slow speed running.

By moving this obturator in the direction of the arrow shown in Fig. 1, the various carburation chambers a1, az will be successively put in function, in variable number `according t'o the power required from the engine.

In order to permit, particularly in case of slow speed running, an additional admission of air, for t-he purpose of varying for instance the speed of the engine from 15.0-to 900 revolutions, the valve bod h has its bore .l1/f enlarged as at h2 and t is enlarged portion slidably receives a secondary slide valve i, the body of which is also partially bored, the outer end being closedand provided adjacent the closed projecting'portion with a series of holes j through which air enters vfrom the atmosphere and passes through the bore -in the secondaryvalve body and thence through the alignin bore of the mam valve body into the casing By moving the slide valve in the direction of 4.the arrow shown in Fig. 1, the air inlet holes j will thus be successively uncovered and it will thus be possible to vary at will the inlet cross section of the additional air which will have to be added, according to the clesired speed, to the carbureted air supplied by the first Carburation chamber.

The operation of this carburation apparatus is as follows:

For slow speed running, .the valve h, brought to the position shown in Fig. 1, uncoversonly the first carburation chamber a, as above stated.

Owing to the very small cross section of the throttle portion of this carburation chamber, on the one hand the air from the exterior 1 drawn in by the .partial vacuumcreated within the engine, passes through this chamber at a very high speed and thus produces the suction of the gasoline supplied by the calibrated hole e always in the required proportion; on the other hand, this air and gasoline intimately mix together and supply a carbureted mixture sulliciently rich for always ensuring an instantaneous starting of the engine.

' By operating the slide valve z', the propertionof additional air admitted through the holes j can be increased and the speed of running can pass from 150'to 900 revolutions.

For progressively increasing the power of the engine, it suilices to move the obturator h in the direction of the^arrow shown 1n Fig. 1.

i can thus be regulated at Will.

For slowing down the speed of the engine, it suffices to move the valve h inthe reverse directioh so as to successively put out of action the unitary carburetors.

In case this valve It is suddenly brought back to its initial position, corresponding to slow speed running, it is to be noted that owing, on the one hand, to the small mass or body of gasoline drawn in in each carburetor chamber in action and, on the other hand, to the successive obturation of the unitary carbu'- retors', no outflow of gasoline can take place in the latter by effect of inertia, thus doing away with the risks of ire by back firing.

Claim:

A throttle valve for carburetors comprising a valve body reciprocating in an opening in the carburetor casing to control the passage of the mixture through said carburetor, said body having a longitudinal bore, a secondary valve body slidably mounted in the bore and also provided with a bore and with additional passages communicating with the bore and normally covered by the main valve body but adapted to be uncovered upon the independent movement of the secondary valve body to-permit of the passage of additional air through said valve bodies, substantially as and for the purposes set forth.

The foregoing specification of my carburetor, signed by me this 8th day of July, 1924.

AUGUSTE CHANARD. p

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