US1840295A - Carburetor - Google Patents

Description

Jam-5, 1932. s Y 1,840,295

CARBURETOR Original Filed Dec. 29, 1924 2 Sheets-Sheet 1 WITNESS ATTORNEY A. M. SMILEY Jan. 5 1932.

- CARBURETOR 2 Sheets-Sheet 2 0 u m i I m v d m 7 V Z. T -kv/ 6 5 a 6.7 4 4. JP; 2 l/ i 0 J J a s x ANN. V L. V H fi 3 d F /7 1/ l 6 WITNESS:

' of Figure 2.

Patented Jan. 5, I932 UNITED STATES PATENT." orrlce ALFRED M. SMILEY, OI CHICAGO, ILLINOIS, ASSIGNOR TO ALFRED M. SMILEY, JAMES B. KILLIAN, FRANK MARRIOTT, THOMAS E. BURNS, LOUIS M. SIPPEL, ROBERT BEN- NINGER, AND PANY LEON M. FEIGENBAUM, DIRECTORS OF ST. LOUIS CARBURETOB COM- CARBURETOR Application filed December 29, 1924, Serial No.

..- the engine. l d

Another object is to provide a carburetor in which both air and fuel are controlled in a. novel manner to provide the desired mixture.

Besides the above, my invention is distinguished in the novel manner of controlling the fuel at low and high speed.

WVith these and other objects in view, the invention will be better understood from the following description taken in connection with the accompanying drawings, in which: I Fig; 1 is a side elevation of the carburetor;

Fig. 2 is a vertical sectional view on the line 2-2 of Figure 1; and

Fig. 3 is a sectional view on the line Again referring to the drawings, the numeral 1 designates a valve structure comprisingthe body 2, in which is arranged a low speed port 3, a high speed port 4 and an outlet duct 5, which intercommunicate but are accurately controlled by valves now to be described. The communication between the 7 port 3 and outlet 5 is accurately controlled by the manually adjusted low speed needle valve 6 while communication between outlet 5 is controlled by a valve 7 carried by a stem 8 attached to a collar 9. This collar 9 has a cam action with the cam 10 carried by the stem 11 that has an adjustable connection 12 with the bell crank'13. This bell crank is connected to -any suitable form of accelerator by the control rod 14. The bell crank 13 is connected with the usual butterfly valve 15.-

The outlet 5 is controlled by the needle valve 16 connected to a plunger 17 that is guided in the passage 18 by the spider 19. This plunger 17 has connected thereto a disk valve 20 normally closing the venturi at the 758,713. Renewed May 3, 1929.

restricted portion through the action of the spring 21.

The lower portion of the casing constitutes an air inlet 22 controlled by the disk valve 23 carried on the sleeve 24 that is slidably mounted on the tube 25 and normally held seated by the spring 26. The tube 25 connects with the gasoline supply for conveying gasoline through the ports 3 and 4.

In the operation of the carburetor, the needle valve 6 is set at its most advantageous position so that upon the slight opening of the valve 15 and turning over of the motor gasoline will be sucked through the port 3.

The suction action of the engine lifts the valve disk 20 and thereby opens the outlet 5 so that the gasoline from port 3 may pass through the outlet and through the passage to strike upon the under surface of the valve disk and thereby be scattered and mixed with the ingoing air entering at port 22. The

7 lift of the disk 20 controls the opening of the valve 16 and the flow of fuel therethrough. The fuel escapes at the top of the passage 18 into the draft of air caused by the suction of the engine. This takes place at the throat of the venturi where the air is expanding, and vaporization of the fuel is promoted thereby. vaporization is further romoted by the use of a heating fluid passe into the heating chamber 27 that surrounds the venturi so as to heat the fuel and air as they pass therethrough. As this suction action is taking place, the air is drawn through the air the port 4 and inlet 22 and around the valve to pass straight through the carburetor and be immediately mixed with the fuel, as above described. Upon the operation of the accelerator to increase the speed of the motor, the cam 10, through its connections, will give movement to the stem 8 and thereby unseat the valve 7 to allow additional fuel to pass through the port 4 and through the outlet 5. Of course, it will be understood that upon the acceleration of the engine, the suction action will be increased, giving greater movement to the valve 23 and allowing additional air to enter.

It will be seen that this invention provides a carburetor in which the mixture is controlled for all speeds of the engine simply by operates in the, main air inlet port and is yieldingly controlled so that the amount'of air admitted depends upon the strength of the suction and, therefore, upon the demands made on the engine. The suction also controls" the operation of the valve 16 to admit fuel to themixing chamber; Thus, the amount of fuel and of air is controlled by the strength of the suction. It is, of course, clear that the proportions of the air and fuel inlets can be so arranged that any desired variation in 1 varying mixture can be obtained with the strength of the suction.

. The mixture is further controlled by the valve'7, which is operated in accordance With the operation of the throttle valve. This valve, Which admits additional fuel, is, therefore, also controlled in accordance with the demands made upon the engine.

. While this device'has been described as a unitary device, it is clear that some sub-combinations may be found useful by themselves ,Without other parts of the combination. The. use of such sub-combinations is contemplated by the present invention. Itis further obvious that various changes may be made, Within the scope of the appended claims, in the details of construction Without departing from the spirit of this invention. It is, therefore, to be understood that this invention is not to be limited to the specific details shown and/ordescribed.

Having thus described my invention, What I: claim is:

1'. In; a, carburetor, in combination, a throttle valve, means for-controlling said throttle valve, aventurileadmg to said throttle valve having an air inlet port, a suction controlled valve for said port, a suction controlled fuel valve embodying means disposed at the re stricted portion of said venturi for controlling the passage therethrough, a manually regulated fuel valve communicating With said suction controlled fuel valve, another fuel valve communicating With said suction controlled fuel valve, operating means for said last mentloned fuelvalve connected to the operating means for the throttle valve and operable therewith. I

i 2. In a carburetor, in combination, a throttle valve, a venturileading to said throttle valve and having an air inlet port, a suction controlled valve for said port, a casing forming a heating chamber around said venturi at the restricted portion thereof, a valve carstructure embodying a. fuel passage terminating at the restricted portion of said venturi, a suction controlled memberincludinga fuel valve disposed in said fuel passage and a mixture passagecontrolling valve disposed at the restricted portionof said venvalve for said said air inlet port, asuction controlled valve for said inlet port mounted on the fuel inlet 3i 3e a venturi in said casin extendin aWa from said air inlet port, a valve carrying structure in said'venturi 'at the end of said fuel inlet pipe, a suction controlled: valve member in said Valve carrying structure embodying means controlling the passage of fuel therethrough and means regulating the passage throughthe venturi, a manually regulated fuel valve cooperating With said first mentioned fuel valve having a relatively small port, another fuel valve parallel with said last mentioned fuel valve, control. means for this last fuel valve operatively connected tothe control means for said throttle valve.

4. A carburetor comprising a throttle valve, means for operating said throttle valve, a venturi leading to said throttle valve embodying an air inlet port, a suction. con trolled valve for said air inlet port, a. valve carrying structurein said venturi, a pair of fuel valves in said valve carrying structure controlling the passage of the fuel to. a cooperating suction controlled valve, one ofthe pair of fuel valves being adapted to be open at all times and embodying means for manual regulation, the other of said fuel valves. embodying means whereby the operation thereof is controlled by'means operated by the operating means for said throttle valve.

5. Ina carburetor, in combination, a throt: tle valve, controlling means for'said throttle valve,.a venturi leading to saidthrottle valve having an air inlet port, a suction controlled port, a valvev carrying structure in said venturi embodying a fuel passage, a suction controlled fuel valve in said passage, means on said valve controlling the passage through said venturi at the restricted portion thereof, a manually regulated low speed fuel valve in said valve carrying structure, communicating with said suction con trolled valve, a high speed fuel valve in said valve carrying structure communicatingwith said suction controlled valve, a link connected tosaid operating means for said throttle valve,-a cam on said link, a follower on said high speed fuel valve adapted to engage said cam whereby said fuel valve Will be simultaneously operated With saidthrottle-valve, and means for simultaneously operatingthe operating means for the throttle valve and .an operating means, for a. high speed fuel valve.

6. In a device of the class described, in combination, a throttle valve, a venturi having an air inlet port, a suction controlled valve for said air inlet port, a structure embodying a fuel passage, a suction controlled valve in said fuel passage having means disposed at the restricted portion of said venturi for controlling passage therethrough, a manually regulated fuel valve, another fuel valve operated simultaneously with the throttle valve, said fuel valves communicating with a suction controlled valve in the fuel passage, said throttle valve controlling the suction through said venturi whereby said suction controlled valves are regulated.

7. In a carburetor, a throttle Valve adapted to control the suction through the carburetor, a fuel duct, a suction-controlled fuel regulating valve in said duct, a fuel valve adjustable to a fixed setting adapted to regulate flow of fuel to said duct, athird fuel valve movable to regulate flow of additional fuel to said duct, connections adapted to move said third fuel valve in accordance with the movement of said throttle valve, and a yielding air inlet valve adapted to regulate the flow of air through the carburetor.

8. In a carburetor, a fuel outlet duct, a fuel supply, a valve connected with said supply and adjustable to a fixed setting adapted to regulate flow of fuel to said duct, means for locking said valve in its fixed adjustment, a second valve having a separate connection with said supply and movable to regulate flow of additional fuel to said duct independently of said first valve, means for moving said second valve in accordance with the demand for fuel and a suction controlled outlet valve for said duct.

40 9. In a carburetor, a fuel supply, means providing a fuel duct having three passages opening therefrom one of which provides a fuel outlet passage and the other two being connected with said supply, a valve in one of said supply passages adjustable to a fixed setting to regulate flow of fuel to said duct, a second valve in said other supply passage and movable to regulate flow of additional fuel to said duct, means for moving said sec- 0nd valve in accordance with the demand for fuel, and a suction-controlled valve in said outlet passage.

In testimony whereof I afiix my signature.

ALFRED M. SMILEY.

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