US2252120A - Carburetor - Google Patents

Description

I Aug. M, WM I G. R. ERICSON m mm CARBURETOR 2 Sheets-Sheet 1 Filed Dec. 10, 1940 INVENTOR GEORGE R. ERICSON ATTORNEY Amiga G.R.-ERICSON EfiEZJEQ CARBURE I'OR Filed Dec. 10, 1940 2 Sheets-Sheet 2 w FIG.5.

INVENTOR GE6RGE R. ER ICSON ATTORNEY .bure conduits each capable oi supplying Fig.3.

Patented 12 i attract crgc Erlcson, n

application ut: r it, MM, :1 d No. 369,423 (pi. its-rial he. an induction system comprising two inl w. 1 combustion engines and more particularly a manifolds and an installation of two sepamultiple barrelled carburers or multi- 7 rate carburetors and incorporating asecond form ple mnmw I oi the present 111V! intion.

. Fig. i is an elevation of the engine shown in I titl A t is high speed mixtures d each cong. is a sectioiial elevation of one of the carby'a separate throttle valve, it becomes buretors shownin Figs. 3 and i. a'cult matter to ust this multiplicity oi Numeral l generally indicates a 'multicylinder throttle valves to w a satisiacto idle. This is internal combustion engine; in this instance an is ticularly true oi the commonly used plate eight cylinder engine having a pair of intake type or butte it throttle valve. The reason for manifolds l and 3. Manifold 2 supplies the two t'xuculty will become apparent upon .concylinders at each end and manifold 3 supplies the sider th t th t ta of the ,ular areas central four cylinders with combustible mixture. around a plurality of plate type valves when At the center of manifolds 2 and t is mounted one cracked open a given amount will be much double barrelled carburetor generally indicated greater M the annular area around a single at t. The carburetor 4 isprovided with a suitable valve, controlling a single conduit having the flange B at its lower end for attachment to the capacity of the total of the smallerconduits, when manifolds 2 and 3. The carburetor is provided cracked open the same degree. with two mixture conduits 6 and l controlled by It is also customary in induction systems for separate, throttling valves 50 and 50a, respectivemulticylinder engines to provide separate in- 1y. Conduit 8 supplies manifold 2 and conduit 1 take manifolds for separate groups of cylinders supplies conduit 3. Mixture conduits 6 and l are and to provide separate carbureting or mixture supplied with fuel for normal and full power and conduits to supply these separate manifolds. speed operation through the main nozzles B and It is an object of the present invention to pro- 8a and are supplied with fuel for idling operation vide in combination with an inductionsystem through the idling ports 9 and 9a. for a multicylinder engine having a plurality of A constant level offuel for aspiration through separate-intake manifolds supplied bya pluralthese Jets is maintained in the constant level ity of separate mixture conduits, means for cutchamber II as indicated by the dot-dash line ti e 0 the dling fuel supply to someof said A--A vthe usual float ll Wi'ilCh acts to control mixture conduits. Y the fuel inlets to these chambers in a manner It is a further object of the present invention well known. Fuel is conducted from the fuel to provide an idling fuel cut-off device for use chamber III to the main nozzles 8 and 8a through in an arrangement as above which is responsive metering Jets l2 and Ila and passages i3 and to intake manifold vacuum. "a, respectively; Fuel issupplied to the idling It is a further object of the present invention ports 8 and to from the passages l3 and Ba to provide an-ldling fuel cut oil. device for use through the passages I4 and Ila, l5 and 15a, inan arrangement as above'which is controlled and I6 and lid, respectively. The idling system by throttle position. I 4 posterior to passages l3 and l3a further com- It is a further object of the present invention prise the idling restrictions H. and Ila and the to provide an idling fuel .cut oil devior for use" air bleeds i0 and Na, respectively. It will be in an arrangement as above which is responsive noted that the main nozzle and idling portfor to intake manifold vacuum and which is arranged each mixture conduit are commonly fed through to have a snap action between the "on and off Jets l2 and lie and passages I3 and l3a, respecposlflcns, tively. This arrangement, commonly referred to Other objects and advantageswill appear upon as .interconnected main nozzle and idling jets" referringto the following description and accomhas the well known advantage of providing a panying drawings, referring to which-- smooth transfer from the idling fuel supply to ,Fig. 1 is a plan view of a multicylinder engine the main nozzle supply as the throttle is moved showingthe intake manifolds and carburetor lnopen. It will be seen with the arrangement of corporating one form of my invention. ports 9 and In that the idling system does not Fig. 2 is a sectional view of the carburetor taken cease to discharge immediately as the throttle on line 2-2 of Fig. 1. v I is moved from the idling position, but continues Fig.3 is a plan view of a multicylindcr engine 56 to discharge tolsome degree in the throttle range present arrangement I have chosen to cut off the idling supply to mixture conduit 1 which feeds the manifold 2. It will -be understood, however, that the idling cut oil may be applied to either conduit; the purpose being to starve one group.

of cylinders to eflect a lower idling speed. Further, in the arrangement shown in Figs. 3 and 4 in which two double barrelled carburetors are shown, the idle fuel cut off may be applied to the mixture conduit in more than one carburetor, as to one of the conduits l' in each carburetor supplying the same manifold.

The method of cutting off the fuel to barrel 1 in the carburetor shown in Fig. 2 comprises a valve l9 adapted to be seated at the upper end of idling passage 11.. The valve I8 is attached to the armature 2| of an electr'omagnetgenerally indicated at 22. The armature is arranged to be moved downward as the electromagnet is energized thus closing the passage Ila. A spring 23 moves the valve to the open position as illustrated when the electromagnet circuit is broken.

Electrical energy is supplied by a storage battery duit I will be starved. This will-result ina slowing down of the idling speed and the adjustment of the valve 50 and We will therefore be less sensitive. Also there will obviously be a. saving offueL,

The operation of the device shown in Fig. 5 is as follows:

When the engine is operating and the throttling valves of the carburetor are moved to an idling position, the vacuum in the intake manifold will be comparatively high. This vacuum acting on piston 35 will tend to close the valve 34. Under resistance of the spring 39 only the valve would move gradually toward a closed position as the vacuum increased. This action is undesirable as a lean mixture to some of the 24 through a circuit 25, 26, 21, and 23. Included in the circuit is a switch 29 comprising contacts 30 and 3i and the switch blade 32. The switch blade 32 is carried on a lever 33 which is rigidly attached to one end ofthe rotatable throttle shaft 5Ia. As the throttle is moved to a dead idle position, the blade 32 closes the electromagnetic circuit.

Fig. 5 shows a modification of the idling cutoff device which comprises a valve 34 adapted to be seated on a valve seat 35 in the idling passage immediately anterior to the idling discharge port 9a. The valve 34 is attached to a piston 36 which reciprocates in a cylinder 31 formed in a boss 38. The piston 36 is exposed to atmospheric pressure on the right side and to mixture conduit pressure on the left side. A spring 39 within cylinder 31 urges the piston to the right and consequently the valve 34 toward an open position. Mounted on the boss 38 is an electromagnet which forms a stop for the outward movement of piston 36. Piston 38 may either be made of iron or have'an iron cap ll, as indicated, so as to be held in the magnetic field. A source of electrical energy for energizing the electromagnet 40 is supplied by a storage battery 42 and a circuit comprising electromagnet 40, battery 42 and a manual switch 43 is provided. The manual switch 43 may be arranged to be operated simultaneously with the engine ignition switch. It is the intention to have the electromagnet 40 energized during all engine operation.

In operation of the device shown in Fig. 2, the

lever 33 is moved into position to close the circuit for energizing electromagnet 22 and the valve I9 is, consequently, moved to a closed position thereby cutting off fuel to the idling port of mixture conduit I. As the velocity passing the nozzle 8a is almost nil when the throttle is in idling position it will be seen that the cylinders normally receiving a combustible mixture from concylinders may result in slow firing and popping electromagnet, however, more or less of a snap action of the valve will result. That is the field of the electromagnet will be overcome suddenly, the field strength decreasing rapidly as the piston is moved away by suction. The electromagnet and associated parts being so calibrated that the piston will be moved therefrom to a valve closing position as the suction in the mixture conduit approaches normal idling suction:

The foregoing description and accompanying drawings are intended to be illustrative and not limiting and the exclusive use of all modifications within the scope of the appended claims is contemplated.

I claim:

1. In a multicylinder internal combustion engine,aninduction system comprising a plurality ofinduction conduits each independently supplyinga part of all the engine cylinders, throttle valves for each of said conduits, main and idling fuel passages leading to each of said conduits, and means co -acting with the throttle valve for closing the idling fuel passage to part of said conduits when the throttle valves are moved to a pre-selected idling position.

2. In a carburetor for internal combustion engines, a plurality of mixture conduits, a throttle valve in each of said conduits, an idling port in each of 'said conduits disposed adjacent the edges of said throttle valves, a fuel supplypassage leading to each of said idling ports, and means co-acting with some of said throttle valve for closing the fuel supply passages to their respective conduits when these throttle valves are moved to a predetermined idling position.

3. In a carburetor for internal combustion engines, a plurality of mixture conduits, a throttle valve in each of said conduits, an idling port in each of said conduits disposed adjacent the edge of said throttle valve, a fuel supply passage leading to each of said idling ports, and means re sponsive to suction in said conduits posterior to said throttle valves for closing part of said fuel passages as the suction approaches that required to hold the engine at a normal idling speeds.

4. In a carburetor for internal combustion engines, a plurality of mixture conduits, a platetype throttle valve for each of said conduits, a

main fuel nozzle for each of said conduits discharging anterior to said throttle valve, an idling port opening into each of said conduits and discharging fuel into said conduits at a point posterior to said throttle valve, fuel passages leading to said idling ports, a valve for controlling one of said fuel passages, means responsi ve to a predetermined suction for closing said valve, spring means for moving said valve toward an open position, and an electromagnet for holding said'valve in a wide open positionunder conditions of less than the predetermined suction.

5. In a multicylinder internal combustion engine, an induction system comprising a plurality of induction conduits each independently supplying a part of all the engine cylinders, throttlevalves for each of said conduits, main and idling fuel passages leading to each of said conduits, and means responsive to a predetermined vacuum in said conduits for closing the idling passages to some of said conduits.

6, In a carburetor for internal combustion engines, a plurality of mixture conduits each having a throttle valve, and each having idling and, I

main fuel supply passages leading thereto, a valve for controlling the idling fuel supply passage to one of said conduits, an electro magnet for holding said valve in an open position, a suction responsive device calibrated to overcome the magnetic field of said magnet at a. predetermined vacuum and to move said valve to a closed position, and spring means for moving said valve toward an open position at a lower vacuum. 7. In a carburetor for internal combustion engines, a plurality of mixture conduits, a throttle valve in each of said conduits, a branched fuel passage leading to each, of said conduits, one branch of each of said fuel passages discharging anterior'to said throttle, the other branch of each of said fuel passages, discharging posterior to said throttle, a valve for controlling one of said last-mentioned branches, means responsive to suction posterior to said throttles for moving said valve to a closed position, and an electro-magnet re ifgisting the valve closing action of said suction responsive means up to the vacuum existing at a predetermined idling speed.

GEORGE R. ERICSON.

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