US1821909A - Carburetor - Google Patents

Description

Sept. 1, 1931. A. GIRIN l 1,821,909

GARBURETOR Filed Dec. 11, 192:5 3 sheets-sheet 1 J3 FIGA. l Flc-9.2.

l Sept. l, 1931. A, GIRlN 1,821,909

CARBURETOR Filed Dec. 1'1, 1925 s sheets-snaai 2 ygfm@ www fawn,

Sept. 1, 1931. I A G1R|N 1,821,909

CARBURETOR Filed Deo. 11, 1923 3 Sheets-Sheet 3 6 1 6 le 1'), 10 m1 3 In 1/ Jbl l 21 1/ z E c O o 3 o g n 6 7k h a Z1 j, e] 6 7 o la 5 which is in communication withthe well 1 through ducts 15 (Figure 4). Y

It has been previously stated that the air may flow through the passages and 11 because under 'the action of suction, the emulsion air entering through the openings j and then into the chamber 12 and from there through the small opening 13 into the bore 14 of piston 'h and then through passage 15 and well 1 commingles in this well with the fuel. and forms an emulsion which in the ,form of gaseous bubbles rises through the passages 2 11 and 10 in the direction towards the mem- -sure must prevail.

Consequently the air contained in the well 1 has a tendency to escape in the form ofsmall exhaust bubbles to'rise in the passage 11 and to arrive in the passage 10 where there is a partial vacuum. The piston k is conical for part of its length h1, thereby gradually blocking 'thetpassage h3 (Figure 1).

The member m is connected with the well 11 through the horizontal passage 8 and through the inclined passage 9 which terminates at the base of the well 11. The member m is therefore connected with the lowes part of the well 11. The upper part of this well communicates through the canal 18 and through a vertical' groove in the wall of the f part 71, with the tube 14. This tube is in communication with the atmosphere 4through small openings 13 located at the lower portion of the part h and terminating in the chamber 12, the wall of which has several small holes jl in direct communication with the atmosphere.

The passage 8 draws the `fuel Ifrom thewell 11 to the. nozzle m, and since the passage 10 .is at the same level as the assage 8, the inclined passa 11 will be lled with` fuel as well as the lower part of the well 1. This is due to the law of communicating tubes.

The purpose of the annular space h and the internal collar which separates it from the annular space k7 is to allow the pressure in the air passages which unite at m (Figure 3) to be varied. This air which may come directly from the outside or from a sourceof air tobe heated variably and connected with the adjustingdevice o, Figure 5, flows down in the vertical passage 19. Then through the horizontal passage 20, Figure 4,.it arrives in the chamber k", Figure 1. It traverses the conical port k3, and this additiohal air is introduced through the horizontal passages 21, Figure 1, and 22 Figure 2, and vertical passage 23, Fi re 4, to flow into the passage 01 closed y the stoppler 03, Figure 5, and finally landing in the c amber or nozzle element m. A portion ofthe air entering through o is directly admitted to the nozzle m.

The upper face of the sleeve h1 acts as a piston with res ct to the base h* of the tube h5 in which t e piston h operates. The.

movement of the piston varying the volume of fthe chamber h andfthe air which is present therein being compressed and forced upthe vertical duct 16 (Fi re 4) ducts 17 .igures 3 and 4) and 184 igures 1 and 4) into/the well 11 `arranged 1n the passage of the' mixture giving additional air for startin the engine. l

e passages 1&9; 20 serve to place the chamber L3 in communication wlth the `atmospheric air, through canal 19. This passage starts from bushing o and the passage 20 lterminates at 21 in the annularspace ha.

In this way atmospheric pressure is caused to prevail in the said space.

The valve n is carried by the rod' n. This rod is connected with the bar n' which is pivotally member is fixed to the shaft g1.

The chamber h is a closed chamber into which the air cannot enter at j. The volume of the piston L reduces the volume of this chamber h and therefore compresses the air in this chamber. This air therefore is forced from said chamber through the vertical lateral passage 1 (Figure 4). The air flows from this passage through the passages 17, 18 tothe upper. portion of the well 11 made in the passage of the fuel with which it comfastened to the member g and this municates by a recess. The movement of the piston therefore induces the inflow of the fuel contained in the well 11 and brings this fuel to the Well 1. In the return stroke of l the piston the air forced into the well 11 vreturns into the chamber h. h

The addition of air to the mixture will now be described. Air heated by the engine exhaust or otherwise, enters by the ipe o and is drawn through the nozzle m y the suction'of the engine mixing with the mixture entering the nozzle m through the ports m. This mixture `then enters a hollow chamber n communicating by passages n1 with the chamber 'n1 of the induction pipe 'nof the engine, mixing with air drawn into the mixing chamber n* by the engine and an air-fuel mixture having a composition of optimum quality enters thecylinders of the engine through the induction pipe n. The inlet of the main air is regulated by the valve n, which uncovers to a greater or less extent the opening n. This plug valve is aixed to the member g by a connecting rod n1 and a piston rod n.

The action of the carburetor when working under normal pressure is as follows:

through ports y'.

claim f 1. The `main air enters through n controlled b v the valve n.

2. Heated air enters through o and passes throu h the nozzle m.

3. ir for aerating the fuel enters the ports 4. Further .air Acmpres'sedbv the piston. h1 for starting enters through ports j.

These admissions of air are controlled by the rotation of the spindle g. When this latter has rotated in ythe direction of the arrows shown on Fig. 1, the piston a* has risen, increasing the flow of fuel;y the piston h has risen at the same time increasing the flow of air and the piston as descended increasing the flow of main air. These different movements-caused by the rotation of the'spindle g3 are controlledby the accelerator pedal connected to this latter. At the time of decelerating the inlet of fuel is diminished at the same time as that of the air. The piston k1 by its rapid descent causes a slight fall of pressure on the carburant which balances the inertiaV of this latter and prevents the enrichment of the mixture at the moment when the engine is .being slowed up. The use of the piston h1 is thus to render the engine more sensitive to the accelerator pedal.

At the end of the stroke of the piston a the valve a completely/shuts olf the fuel inlet avoiding loss during stopping or during long descents if the engine is not running.

rIhe strokeof the pistons and the air inlets are controlled to give the best `mixture for each position of the accelerator.

Adjustments are made from time to time by moving the fulcrum of the lever c, a

movement controlled through the cam 'd3 and arm d by the spindle d* ailixed to the control lever to slightly modify the proportion of ffnel to air.v This .proportion varies with temperature, compression,-height and thecom osition of the fuel.

aving thus described my invention, `I

1. A carburetor including ay fuel inlet, a needle valve to control said inlet, a piston, a

with ports which register with such air ports,

said ast named piston being active to force aerating air through the fuelin said well and means actuated by said controlling elementl to actuate said hollow piston.

Inwitness whereof I aix my signature.

. ANTOINE GIRIN.A

cylinder in'which said piston operates, a

sleeve carried by said piston and ,in which sa1d needle valve is arranged, a sprmg in said sleeve bearing on said needle valve,V a

control shaft, a lever operated by the control shaft and having a oating fulcrum, a rod connecting said lever to` said piston, and means to vary the position of the floating fulcrum to thereby vary the stroke of the piston. 4

2. A carburetor including a fuel inlet, a needle valve to control said inlet, a piston, a cylinder in which said piston operates, a sleeve carried by said. piston and ini'which said needle valve is arranged, a spring bearing on said needle valve, a controlling element, a lever operated by the controlling element and having a ioating4 fulcrum, a rod

Images