US1838676A

US1838676A - Carburetor

Info

Publication number: US1838676A
Application number: US258739A
Authority: US
Inventors: Frank H Heitger
Original assignee: Individual
Current assignee: Individual
Priority date: 1928-03-03
Filing date: 1928-03-03
Publication date: 1931-12-29
Anticipated expiration: 1948-12-29

Description

pran D? 198380676 DCC. 29, F. H HElTGER 1,838,676

CARBURETOR Filed March f5, 1928 Patented Dec. 29, 1931 Examiner PAT-ENT OFFICE FRANK H. HEITGER, F FLINT, MICHIGAN CABBURETOR Application led March 3, 1928. Serial No. 258,739.

This invention relates to certain new and useful improvements in carburetors and more particularly to carburetors for internal combustion engines used in connection with motor vehicles and the like where the speed is variable, varying from a minimum speed to a high speed and where it is required to feed fuel to a carburetor posterior of the throttle in the carbureting passage for the minimum or idling speed and to augment the fuel feed as the throttle is opened and before the main feed comes into action fully and is a companion application of my application filed March 3, 1928, Serial Number 258,738.

The main object of this invention is to provide a novel form of throttle valve to be used in connection with the idling and transfer feeds so that the proper mixture will be de livered to the internal combustion engine when the engine to which it is attached is idling.

Other and further objects and advantages of the invention will be hereinafter set forth and the novel features thereof defined by the appended claims.

In the drawings,

Figure 1 is a vertical section through a carburetor constructed in accordance with my invention showing the fuel bowl in elevation;

and

Figure 2 is a detail section through the carbureting passage showing the throttle valve in elevation with its lip extending over the idling passages.

In the drawings I have shown a carburetor constructed substantially the same as shown in my companion application comprising a body A having a carbureting passage B terminating at its upper end in an outlet B1 and at its lower end in a lateral air inlet B2 having a choker valve B3 mounted therein for controlling the admission of air thereto in the usual manner.

Arranged in the carbureting passage is a Venturi tube 1 into which extends a main fuel nozzle 2 which is in communication with a main fuel passage 3 extending from a float bowl 4 which is of the ordinary construction now in general use on carburetors, the flow of fuel from the bowl being controlled by a removable plug 5 having a calibrated orifice for allowing the maximum amount of fuel to pass therethrough.

An auxiliary fuel passage 6 is formed in one wall of the carbureting passage and in the embodiment of my invention as shown, is supplied with fuel from an auxiliary reservoir 7 extending from the main fuel passage 3. The lower end of the auxiliary fuel passage 6 is enlarged to receive the upper end of the reservoir which is provided with a restricted outlet 8 subjected to suction and is adapted to feed fuel to the auxiliary passage 6 at substantially closed throttle position and to feed air to the main fuel passage 3 as the throttle is moved into open position substantially as described in the patent issued to Guthrie, December 5, 1916, No. 1,207,029. While I have shown the auxiliary fuel passage 6 supplied with fuel from an auxiliary reservoir, I do not wish to limit myself to any particular means of supplying fuel thereto,

as I am aware that the same can be supplied with fuel from any source of supply, such as a well or directly from the fuel bowl without departing from the spirit of my invention which will be hereinafter fully described.

The auxiliary fuel passage 6 terminates at its upper end in an annular chamber 9 formed by the end of a screw plug 10 working in a threaded bore formed in the wall of the carburetor as clearly shown. The annular chamber 9 is provided with

superposed orifices

11 and 12 forming fuel jets for idling and transfer, these openings communicating with the carbureting passage B of the carburetor for supplying a fuel mixture thereto as will be later described. The passage 6 is provided with an air port 13 controlled by a screw 14: of the ordinary construction now in general use on carburetors.

Extending transversely through the carbureting passage B slightly below the

orifices

11 and 12 is a throttle valve shaft 15 carry ing a butterfly type of throttle valve 16 having a lip or projection 17 on one edge provided with an opening 18 adapted to register with the idling passage 11, the solid portion of the lip being adapted to close the transfer passage 12 when the throttle valve is in the closed position as shown so that the idling passage 11 is in constant communication with the carbureting passage to the engine side of the throttle valve to supply a fuel mixture to the engine when there is sufficient suction.

Vhen the throttle valve is slightly opened, the-transfer passage 12 is uncovered so as to allow both of these passages to supply fuel and when the throttle valve is moved into a still further open position, the idling passage 11 will feed air or a very weak mixture to the passage 12 so as to obtain substantially the same results obtained in my companion application or weaker mixture from l2.

The throttle valve is so constructed that when it is in closed position, it is arranged at an angle and closes the carbureting passage and the orifice 12, by means of the lip 17 which has some spring to it a suitable stop mechanism being carried by the shaft of the throttle valve shaft constructed in substantially the same manner as shown in my companion application for preventing the throttle valve from being sprained or distorted by moving too far into a closed or open position.

The throttle may be stamped or otherwise formed with a lip or projection or the projection may be a separate member attached thereto having an opening formed therein, therefore I do not wish to limit myself to any particular manner of forming a throttle valve so long as it has a projection with an opening for closing the orifice of the transfer passage and for allowing the other orifice to be in constant communication with the carbureting passage to the engine side of the throttle.

In order to supply the proper amount of air for idling when the throttle is in closed position or substantially closed position, I provide the throttle valve with an opening 19 to which air is adapted to pass from the anterior to the posterior side of the throttle and while I have shown this means of supplying the air to the carbureting passage above the throttle, I am aware that the opposite wall of the carbureting passage can be provided with an opening as shown in mv companion application for by passing air around the edge of the throttle for obtaining the desired result without opening the throttle for idle speed.

While I have shown a particular construction for supplying fuel to the

idling passage

6,1 do not wish to limit myself to the means shown as I am aware that the fuel passage can be connected directly to any suitable source of supply but when connected to a source of supply as herein shown and as fully described in my companion application, the carburetor will operate in substantially the same manner as that disclosed in my companion application tiled even date herewith with the exception that instead of having the upper orifice of the idling passage in constant communication with the carbureting passage when the throttle valve is closed, I have the lower passage in constant communication with the carbureting passage.

In the specication I have used the term transfer to mean the interval or degree of throttle opening, where a single fixed idling feed of proper mixture would be too lean to carry the motor before the main jet started to feed and as the throttle is slightly opened; otherwise during this time the mixture would be too lean from the idle feed alone.

From the foregoing description it will be seen that I have rovided a carburetor with a novel form o throttle valve which oooperates with idling or transfer orifices so as to supply the proper mixture when the throttle valve is closed and as it moves from a closed to an open position before the main feed comes into action.

Vhat I claim is:

1. The combination with a carburetor, of a carbureting passage, a main fuel feed discharging into said passage, an auxiliary fuel passage having superposed openings for communicating with said carbureting passage for idling and transfer, a throttle valve for closing said carbureting passage provided with a lip having an opening, said opening being adapted to register with the idle opening of said auxiliary passage when said throttle valve is in closed position, means for feeding air from anterior to posterior of the throttle, said throttle being adapted to move into open position on the said transfer port side in the direcion of travel of fuel and air passing through said carburetor passage.

2. The combination with a carburetor, of a carbureting passage, a main fuel feed discharging into said passage, an auxiliary fuel passage having superposed openings communicating with said carbureting passage, a throttle valve for closing said carbureting passage provided with a lip having an opening, said opening being adapted to register with the idle openino' of said auxiliary passage when the throttle is in closed position, means for feeding air from anterior to posterior of throttle independent of throttle opening, said throttle being adapted to move into open position in the direction of travel of fuel and air passing through said carbureting passage on the said lip side of the throttle, the lower opening of said auxiliary passage being in constant communication with the carbureting passage.

3. The combination with a carburetor, of a carbureting passage provided with a main fuel feed for feeding fuel into said passage, an auxiliary fuel passage having superposed openings communicating with said carburetj signature.

FRANK H. HEITGER.

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