US1817861A - Carburetor - Google Patents

Description

G. WAHNISH Aug. 4, 1931.

CARBURETOR Filed June 12, 1928 3 Sheets-Sheet l gnoenfo'b 4 WAumsH.

BEDRGE Aug. 4, 1931.

G. WAHNISH CARBURETOR Filed June 12, 1928 3 Sheets-Sheet 3 attoumq justments,

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GAREBURETfiLt Application nee ram is,

This invention relates to carburetors and more particularly to carburetor-s designed for use in automobiles.

The carburetor art has of course reached an exceedingly high state of development accompanyin the like development in motor vehicles using internal combustion engines. However as actually used; at the present time such carburetors are unnecessarily complicated in structure entailing a variety of adjustments for proper operation, an excessive number of working parts frequently entailing mi operation and waste, and an inordinate co t of manufacture and operating expense. For example, the carburetors in acat least two sets of aspirating tubes, one for normal operation and the other for idling operation of the engine. Further, the mixing chambers where the fuel and air are admixed are generally Venturi shaped or communicate with Venturi passages to obtain the required speed and mixture of fuel and air. These and other features lead to the factors of excessive cost in manufacture, operation, and upkeep, referred to above.

The invention set forth in the instant application is designed to eliminate the factors referred to above so that economy of manufacture,-.operation and upkeep are obtained.

Accordingly among the objects and advantages "of the present invention are the elimination of idling jets and accompanying adthe elimination of Venturi chambers, etc.

Other and further objects and advantages will appear from the more detailed description of the invention specifically set forth below, taken in connection with the drawings illustrating a desirable form of the invention,

It will be understood however that this more detailed description is given by way of illustration and not as limiting, since various changes, therein may be made by those skilled in the art without departing from the 19933. Serial ll'o. 2%,777.

scope and spirit of the invention specifically disclosed and claimed herein.

Referring to the drawings illustrating one form of the invention that may be desirably used, there is shown in Figure 1, an elevation of a carburetor embodying the invention herein set forth; in

Figure 2, a vertical sectional view through the carburetor of Figure 1; in

Figure 3, a detailed view partly in section, on the line 33 of Figure 2, looking in the direction of the arrows; and in Figure l a detailed view partly in section, on line H of Figure 2.

In the form of device desirably illustrated in the drawings there is shown a carburetor havin a fuel chamber 1 formed by the cupshaped wall 2. The fuel chamber 1 is supplied with fuel from the fuel inlet pipe 3 0011- I trolled by the usual fuel inlet valve (not shown) in the valve housing 4. In accordance with well known construction, the fuel inlet valve is operated by a float 5 within the fuel chamber 1 so that when the float 5 drops with'a decrease of fuel in the fuel chamher, the fuel inlet valve is opened to allow ingress of fuel into the fuel chamber, while when the fuel in the fuel chamber reaches a predetermined level causing rising of the float 5, the fuel inlet valve is closed cutting off the ingress of fuel. A cock 6 is connected to the lower portion of the fuel chamber 1 serves to drain the latter if, and when desired.

An air inlet chamber 7 is located adjacent the fuel chamber 1, the air inlet chamber being open at one end 8 to the air inlet manifold (not shown). The open end 8 of the air inlet chamber is desirably provided with a seat 9 for the choke valve 10 as is generally the case for the purpose of closing the air inlet chamber 7. The lower wall or floor 11 of the air inlet chamber is desirably depressed as shown at 12 for purposes hereinafter set forth.

The depressed floor 12 of the lower wall Ell 2 her.

of the air inlet chamber is continued as a downwardly progecting member 13. A passage or opening 16 in the member 13 is continued upwardly by a tube 16a and ends slightly below the level of the break in the aspirating tube 31. l6 and tube 16a serve to drain the air inlet chamber. A second, desirably tubular passage l i-a, in the depending member 13 serves as a continuation of the aspirating tube 31 and this passage 14a connects by passage 1% with the fuel chamber. The depending member 13 ends in a reduced portion 15 which serves as a seat 17 against which the fuel chamber Wall 2 seats. For this purpose the portion 15 is threaded as shown at 18 and the threaded end received the Wall Zby virtue of opening 19 in the latter. A. nut 20 holds the Wall 2 and the shoulder of the seal 1'?" so that the opening betWeen the several parts is closed securely.

In order to seal the fuel chamber at its upper edge, the lower face of the lower Wall 11 of the fuel inlet chamber is desirably pro vided with a roove 21 adapted to serve as a seat against W rich the upper edge of the Wall 2 of the fuel chamber l is seated, which purpose the Wall 2 may have a reduced end 22. A gasket of course may be used in the groove 22. By means of the 20 the Wall 2 is forced into close engagement with the walls of the groove 21 and the seat 17. I

The inner end of the air inlet chamber 7 opens into the mixing chamber 23 the upper Wall 24: of the air inlet chamber serving as a seat 25 for the valve 27 desirably weighted as shown at 28. this flapvalve- 27 serving to close the'opening between the air inlet chamber and the mixing chamber. The flap valve :may therefore be pivoted 29 its movement may be limited and controlled by the bolt 30 threaded through the Wall 01 the mixing chamber.

Within the air inlet chaniber i w is an aspirat ing tube or nozzle 3?. brolren tivo portions 31a and 315, so that the i Well Within the inlet passage.

tion 310; of this aspire. to the central portion oi air inlet chamber 7 and con 7 passages Ma and l lwith the her 1. The portion 3% the 81 is attached to the upper Wall no air inlet chamber and communica es through an opening 35 with the mixing chamber 23. .uesirably the opening lo and tube portions lilo; 3 a co! tinuous passage for reception needle valve stem.

A number 0 the wall l2 of per portion of the 1H inner end of the air 36% opening in rest her at a point or series of points contiguous to the flap valve 27. These passages 86 may of course vary considerably in number and may comprise a series extending substantially around and through the depressed Wall 12 of the fuel inlet chamber.

Additional passages 37 are provided Which communicate'vvith the fuel chamber 1 at one end and with the mixing chamber 23 at the other end. These passages are desirably drilled through the Wall 12 Without entering or touching the air inlet passage proper, and preferably open into the mixing chamber at points near the opening 35 which it will be recalled serves as a communication between the tube 31?) and the mixing chamber 23.

lhe mixing chamber 23 communicates with the fuel-air mixture outlet 88 that leads to the usual engine manifold (not shown), but the passage from the mixing chamber 523 to the outlet 38 is adapted to be regulatably restricted as desired by the usual throttle valve 39 seating against the inner Wall of the outlet 38 and pivoted for movement Within the passage and operated in the usual manner so that further explanation thereof is unnecessary.

An opening 40 between the fuel-air mixture outlet 38 and the atmosphere is provided. This opening or passage 40 may for example be formed by threading an opening ell in the Wall of the outlet 38 and closing the opening by a threaded plug 42 the plug carrying the opening or passage 40.

The Wall ol the mixing chamber 23 is provided with a threaded opening at adapted to receive nut provided With an internally threaded opening into which the threaded end of the needle valve :5 is extended. The head 4'? is desirably formed as a thumb screw to allow of ready adjustment of the needle valve and so the pointed end 48 of the needle valve (l5, when desired, may be seated. against the Walls oi the opening b the chamber and the passage ill-oz, to close substantially the opening A or to regulate the size this opening.

order to equalize the pressures in the fuel chamber during operation. passages suchas those shown in Figure 3 may be utilined, and in addition the passage 50 (see i. x: h orally open wining the turnw lit! ' said mixing chamber,

into the air inlet chamber, a flap valve between said air inlet chamber and said mixing chamber, a needle valve controlling the entry of fuel from the fuel supply chamber to the aspirating tube, passages communicating with the upper portion of the fuel supply chamber and the air inlet chamber, additional passages connecting the upper portion of the fuel supply chamber directly with the mixing chamber, a fuel-air mixture outlet communicating with said mixing chamber, a throttle valve closing the passage between the mixing chamber and fuel-air outlet, and a passage in the fuel-air outlet communicating with the atmosphere.

3. In a carburetor including a fuel chamber, an air inlet chamber adjacent to said fuel chamber, a mixing chamber communicating with said air inlet chamber, and an aspirating tube connecting the fuel chamher and mixing chamber and opening into the air inlet chamber, passages providing communication between the upper portion of the fuel chamber and air inlet chamber, and additional passages providing communication directly between the upper portion of the fuel chamber and the mixing chamber.

4:. In a carburetor including a fuel cham her, an air inlet chamber adjacent to said fuel chamber, a mixing chamber communicating with said air inlet chamber, an aspirating tube connecting the fuel chamber and the mixing chamber,means providing communication between the upper port-ion of the fuel cham "her and air inlet chamber, and additional means providing communication directly between the upper portion of the fuel chamher and the mixing chamber.

5. A carburetor comprising a fuel supply chamber, an air inlet chamber adjacent said fuel supply chamber, a mixing chamber communicating with said air inlet chamber, an aspirat'ing tube communicating at one end with said fuel supply chamber and discharging at the other end into said mixing chamber, a flap valve between said air inlet chamber and a needle valve controlling the entry of fuel from the fuel supply chamber to the aspirating tube, passages commpnicating with the upper portion of the fuel supply chamber and the air inlet chamber, additional passages connecting the upper portion of the fuel supply chamber directly with the mixing chamber, and a fuel-air mixture outlet communicating with said mixing chamber.

6. A carburetor comprising a fuel supply chamber, an air inlet chamber adjacent said fuel supply chamber, a mixing chamber communicating with said air inlet chamber, an aspirating tube communicating at one end with said fuel supply chamber and discharging at the other end into said mixing ('ll2lll1 her, the aspirating tube having an opening into the air inlet chamber, a flap valve between said air inlet chamber and said mixing chamber, a needle valve controlling the entry of fuel from the fuel supply chamber to the aspirating tube, passages communicating with the upper portion of the fuel supply ber.

GEORGE YVAHNISII.

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