US1828889A - Carburetor - Google Patents

Description

Oct. 27, 193-1. E. F. CIGLIALEZT AL CARBURETOR Original Filed July 23, 1925 2 Sheets-Sheet 1 mat R l O w. a a

E. M MOU YQ M \i Oct. 27, 1931. E. F. CIGLIA ETAL 1,828,889

CARBURE'IOR Origingl Filed July 23, 1925 2 Sheets-Sheet 2 INVENTOR Ema/a 7-.- v/ /m BY Lou/; Tr e/kf/eq A-TTORNEY Patented a. 27, 1931 UNITED STATES PATENT OFFICE- ERNESTO F. CIGLIA, 0F SOABSDALE, AND LOUIS F. PELLETIER, OF EAST BRONX, NEW

YORK, ASSIGNORS OF ONE-FOURTH TO WALTER. W. IRWIN,. OF NEW YORK, N. Y.,. AND ONE-FOURTH TO VICTOR VON SCHLEGELL, 01 WHITE PLAINS, NEW YORK caniaumrron.

Application filed July 28, 1925, Serial No. 45,582. Benewed'March 7, 1931.

Our present invention relates to an improvement in carbureting devices for supplying fuel to internal combustion engines and has for its object the improvement in the fuel feeding means as applied to an engine, the elimination, as used in,present day practice, of vacuum feed tanks in the fuel line, and floats and float chamber controls within the carburetor, and the accomplishment of the desired objects by a simple, small carburetor having a minimum number of parts in View of the requirements, thereby simplifying to a very large extent the manner in which fuel mixtures are accomplished with present day types of fuels.

Another object of our invention is the manner in which variations are accomplished in the liquid fuel feed connections themselves whereby to vary the proportion of volatile. fuel supply to a given air volume during predetermined air velocities.

Another object of our device is to provide for a variable Venturi device which is variablewith the above noted fuel feed nozzle changes.

Another object of our invention is the provision of an automatic Venturi control means whereby upon the setting of the manually variable Venturi, the change in position of the variable venturi causes the automatic Venturi control to operate variably through the action of the engine and is operated there- Another object of our invention relates to the means whereby motor fuel drawn to the carburetor from a low level tank in the pres ent mode of automobile construction directly by the suction producing means of the engine.

Another object of our invention is the provision of means in this systemwhereby the inlet connection from the motor fuel-tank is so constructed and arranged as to maintain within itthe fuel content at the carburetor regardless of the movement of the fuel in the tank so that the inlet is at notime uncovered.

bile engine, a carburetor therefor, part of an automobile'frame and a fuel supply tank.

Fig. 2 is a transverse section of the fuel tank.

Fig. 3 is a side view of the carburetor.

Fig. 4 is a central vertical, longitudinal A, designates an'internal combustion automobile engine which may be of any suitable form.

B, is a carburetor for said engine.

C, is part of the frameof an automobile on which said engine is mounted.

D, is the fuel tank for said engine. As here shown it is arranged on a lower level than the engine and at the rear end of the automobile frame.

The carburetor shell B has a Venturi tube which at one end is provided with an air receiving chamber 6 an air accelerating chamber 6 a throat b, a mixing chamber 6 and a mixture controlling chamber 6 the latter being in communication with the manifold of an engine and fastened thereto by means of a flange b and screws passing through the flange into the manifold.

In the air receiving chamber 6 is a butterfly valve E aflixed to a shaft which has hearings in said chamber and is provided with an arm e by which it may be oscillated to more or less choke the air receiving chamber. A wire attached to this arm servesto move it in one direction and it' is moved in.v

the reverse direction by a spring 6 coiled thelshaft and the other with the carburetor she I. a

F designates the fuel inlet of the carburetor and it is shown as consisting of two parts,

f f One part, f is secured in the carburetor shell and receives fuel from the fuel tank through an intermediate pipe G. The other part 7 slides longitudinally upon the part 7 and communicates with the mixing chamber 1) of the carburetor.

Motion may be imparted to this part f by means of a pair of arms f extending from a rock shaft f which is journaled in the carburetor shell and said arms terminating each in a fork f arranged one on each side of the carburetor shell to receive the ends of pins f attached to the part f of the fuel inlet.

The rock shaft f may be oscillated by an arm. 7 which is aflixed to it and connected to a wire f extending through suitable bearings to .a point where it may be reached by the driver of an automobile.

Movement of the part f of the fuel inlet in one direction is limited by a shoulder on the part and in the other direction by an adjustable stop consisting of a set screw f".

. H designtes a VQIltllIl controlling valve located at the throat b of the Venturi tube. Itconsists of a valve plate sliding in the carburetor shell transversely to the Venturi tube and having a hole in its lower portion, which according to the position of the valve Wlll more or less control air velocities through the Venturi tube.

I, designates a fuel valve here shown as a needle valve having two flat surfaces converging towards its end so as to make it taper in two planes which are parallel with the axis of the Venturi tube. It projects into the movable bore f of the fuel inlet, hence by moving it longitudinally thereof or by moving the latter longitudinally thereof the amount of fuel discharged into the mixing chamber of the Venturi tube may be caried from time to time.

The fuel valve is secured to a block h which is afiixed to the Venturi controlling valve, hence when the said controlling valve is moved it carries .the fuel valve with it.

It is advantageous to enga e the fuel valve with the block k by means 0 a screw threaded portion 2' to provide for its adjustment relatively to the Venturi controlling valve. Above the block 72. the fuel valve has a cylindrical ortion i which protrudes through the car uretor shell and at its outer end has a notch with which a screw driver maybe engaged for making adjustments.

, Movements of the Venturi valve and fuel valve together are produced by means of a pin k fitting in a notch in the block [b and carried by two arms h which are affixed to a tubular rock shaft h mounted on an axle supported in the carburetor shell and having afiixed to it an arm h.

The latter has attached to it one end of a spring 7i whose other end is secured to the carburetor shell. It also has attached to it by a pivot pin it" a cam follower made in the form of a, plate h which works longitudinally in a slot h in a transverse vertical partition in the up er part of the carburetor shell, Fig. 5, an is bifurcated at one end to embrace and hang on the edge of a cam J.

This cam J is carried by an oscillating shaft 7' which is journaled in the carburetor shell and has afiixed to it at one protruding end an arm 7' which is intended to be connected to a suitable device within reach of the driver of the automobile.

When moved in one direction the cam J will force the cam follower h in a direction to raise the Venturi controlling valve H ahd the fuel valve I, and when moved in the other direction it will permit the spring h to lower these valves. Set screws 9' in the carburetor shell form adjustable stops for limiting the motions of the cam.

On the shaft j and within the mixture con- I trollin chamber 6 is a mixture controlling vave l here shown as a butterfly valve.

It will be obvious that the turning of the arm 7' will cause a simultaneous movement of the Venturi controlling valve the fuel valve and mixture controlling valve, but owing to the use of the cam J the speed of the movements imparted to the Venturi controlling valve and the fuel controlling valve will be different from that of the mixture controlling valve.

Different types of internal combustion engines vary somewhat in their operation, and to conform to their peculiarities difierent cams may be used instead of the particular cam J whichhas been illustrated.

Besides the positively operated valves at ready described there is an automatic valve L. It is pivoted at one end in the carburetor shell by a pin Z near the inlet end of the air accelerating chamber 5 of the Venturi tube and works within a longitudinal slot thereof. Its form is that of a segment of this chamber and when moved upwardly it will form a continuation thereof. It may be moved downwardly beyond said slot into this chamber as far as permitted by a pin Z Whose ends extend beyond the slot in which said valve L works.

A spring Z serves to move the valve L into the said chamber 6 with a force which may be variably opposed by turning a screw Z against which one end of the spring Z bears.

The suction of the engine when greatest will move the valve L into a position in which it will form a continuation of said chamber 6 this suction the spring Z will move the valve L more or'less into this chamber.

In combination wi h the carburetor B and Fig. 2. As here shown it is arranged within correspondingly with the reduction ofv amass said tank and partly in a well (2 extending downwardly from the tank and at the end 0 the extension 9 of the pipe-G. This check valve is shown as made in the form of a pin having a conical lower end corresponding with the valve seat 9 and restrained against excessive movement by a spider g. Preferably a screen 9 will protect the lower end of the valve seat from any material likely to clog it. It is also set low in the fuel tank, in order to be well within the fuel thereby to be always covered until the tank is empty.

While fuel is flowing properly to the carburetor this check" valve will be open but if there is any tendency of the fuel to flow back wardly into the fuel tank this check valve.

will close upon its seat and prevent refiow.

It will be observed by a glance in Fig. 2 that the well (17 is so much larger than the valve seat that it will permit flow of the fuel from the tank to the valve seat. a a

With the air accelerating chamber and mixing chamber of the Venturi tube made substantially of the taper shown and the flare of the mixing chamber made substantially as shown and the use of the automatic valve L,

the Venturi controlling valve H and the check valve M, the ordinary float and float chamber and a vacuum feed mechanism are.

, 7 in said bore, and a spring compressed between unnecessary.

We claim as our invention: 1. In a carburetor of an internal combustion engine, a shell formed with a forwardly pointing approximately cone-shaped air accelerating chamber forming a throat at the inner end. fuel inlet means nearthe throat, said accelerating chamber being provided with an elongated rectangular opening in its walls, a suction operated air valve movable independently of said fuel inlet means, pivoted at its outer end in said opening, and having its inner end and sides engaging edges of the opening at all positions of the valve, a

housing situated above said chamber and air valve. means between said housing and valve yieldably pressing said valve inwardly. said suction operated valve having its position determined by the degrees of suction of said engine.

2. In a carburetor of an internal combustion engine, a shell formed with inwardly pointing approximately cone-shaped air accelerating and mixing chambers joining at their inner ends to form a throat, a fuel inlet means having a bore discharging into the mixing chamber at one side near the throat, a manually operated air control valve slidable across said throat towards'said side,

' a va ve needle carried by said valve andprojecting into said bore, said accelerating chamber being provided with 'an elongated rectangular opening in its wall, an automatic suction operated air valve in said'opening having its outer e d pivoted and its inner end and sides provided with walls engaging edges of the opening, a housing above said chamher, and adjustably controlled yieldable means between said housing and chamber for ;able across said throat and projecting into said bore, said accelerating chamber being provided with an elongated rectangularopening in its upper wall extending from end to end thereof, an automatic suction operated air valve movable in said openingrand having its outer end pivoted at the outer end of the opening and its inner end provided with an upstanding arcuate wall, its sides and inner end all slidably engaging the adjacent edges of the opening. stop pins projectin from the upper part of the inner ends 0 the side walls and disposed over the side edges of the opening, a housing on the shell over saidvalve having a threaded bore, a turning screw said screw and valve, thelatter having its po sition determined by the degree of suction of said engine.

4. In a carburetor of an internalcombustion engine, a shell formed with a forwardly pointing approximately cone-shaped air accelerating chamber forming a throat at its inner end, a fuel inlet means adjustably positioned near the throat transversely thereto, a fuel valve in the plane of said inlet, adjustably to project thereinto, a manually controllable Venturi valve disposed to move transversely to said throat, said chamber being provided with an elongated rectangular opening in its wall, an automatic suction operated air valve pivoted at its outer end in said opening and'having its inner end and sides engaging edges of the opening at all positions of said automatic valve, the inner face of the automatic valve forming a continuation of the conical surface of the chamber, said automatic valve having its position determined by the degree of suction of said engine and the position of said manually controllable valve.

5. In a carburetor for an internal combustion engine, a shell formed with inwardly provided with an elongated rectangular openin in its well an automatic suction o erated 7 air valve in said opening having its outer end pivoted at the outer end of said opening and its inner end and sides provided with walls engaging edges of the opening for all positions of the valve, a spring pressing said automatic valve inwardly the latter having its position determined by the degree of'suction of said engine.

Signed at New York in the county of New York and State of New Yorlg this 22nd day of July A. D. 1925. a

ERNESTO F. CIGLIA.

LOUIS F. PELLETIER.

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