US2247189A

US2247189A - Carburetor

Info

Publication number: US2247189A
Application number: US347073A
Authority: US
Inventors: Guyon Clement De
Original assignee: Individual
Current assignee: Individual
Priority date: 1940-07-23
Filing date: 1940-07-23
Publication date: 1941-06-24
Anticipated expiration: 1958-06-24

Description

June 24-, 1941.

C. DE GUYON CARBURETOR I Filed July 23, 1940 5 Sheets-Sheet l In ven tor (Yemen/ flak Va A iiorne y June 24, 1941. c, DE GUYON CARBUREIOR 3 Sheets-Sheet 2 Filed July 25, 1940 Inventor k I 0 0/0/&(o Ma Aiipfney I June 24, 1941. c. DE GUYON CARBURETOR 3 Sheets-Sheet 3 Filed July 23. 1940 In ventor Patented June 24, 1941 UNITED s'm'rss rarest entice CAR/BURETOR Clement dc Guyon, Hartford, Conn.

Application July 23, 1940, Serial No. 347,073

1 Claim.

This invention relates to carburetors for internal combustion engines, and has for the primary object the provision of a device of this character which will admit fuel to an air and fuel mixing chamber by the opening and closing of the throttle valve so as to supply fuel mixture to the engine to meet varying loads on said engine and will render the engine easy to start and eliminate customary choke valves, float valves and associated parts now employed in carburetors used on engines.

With these and other objects in View as will become more apparent as the description proceeds, the invention consists in certain novel features of construction, combination and arrangement of parts as will be hereinafter more fully described and claimed.

For a complete understanding of my invention, reference is to be had to the following description and accompanying drawings, in which- Figure 1 is a top plan view illustrating a carburetor constructed in accordance with my invention.

Figure 2 is a vertical sectional view taken on the line 2-2 of Figure 1.

Figure 3 is a sectional View taken on the line 33 of Figure 2.

Figure 4 is a top plan View illustrating a modified form of my invention.

Figure 5 is a vertical sectional view taken on the line 55 of Figure 4.

Figure 6 is a sectional view taken on the line 66 of Figure 5.

Figure 7 is a detail transverse sectional view illustrating a metering pin sleeve and its mounting within a metering pin cage.

Referring in detail to the drawings, the numeral 5 indicates the body of the carburetor composed of sections A and B. An external sleeve 6 is shrunk on the section A and has a telescopic fit with a portion of the section B and is detachably secured thereto by fasteners l.

The section B has a portion thereof shaped to form a throat 8, flanged, as shown at 9, to permit coupling of the throat onto an intake manifold of an internal combustion engine. A throttle valve l0 of the butterfly valve type is journaled in the throat 8 and the shaft thereof is indicated by the character II. The shaft II is equipped with an operating arm l2 and a stop means I3 for limiting the closing of the throttle valve so that an engine may be kept running at idling speed. Also, the throttle Valve is equipped with ports 14 to permit sufficient fuel mixture to pass the throttle valve when the latter is in a closed. position to maintain the engine operating at idling speed.

It is to be understood that the'arm I2 is connected to the usual throttle operating means for the carburetor.

The section B of the body 5 is further provided with a flared chamber 15 coacting with a flared chamber it in the section A of the body in defining a combined air and fuel mixing chamber.

By referring to Figure 2 it will be seen that the flared chamber of the section B leads into the throat 8 while the Walls of the chamber l6 of the section A of the body have a series of air ports I! connecting with an air chamber 18 formed in the section A of the body.

The section A of the body 5 has formed therein an annular recess closed by the sleeve 6 to form the air chamber it. The air chamber is in communication with the atmosphere by way of a series of passages l9 formed in the section A of the body 5 and opening outwardly through the upper end of the latter. By referring to Figure 1 it will be seen that these passages l9 may be of varying sizes.

The section A of the body 5 is recessed to form a nozzle chamber 28 in which is threaded a nozzle 2|. Interposed between the inner wall of the nozzle chamber and the nozzle 2| is a gasket 22, spacing the nozzle 2| 2. limited distance away from the inner Wall of said nozzle chamber to form an air chamber connecting with an air passage 23 opening outwardly through one side of the section A and the sleeve 6 and in which is threaded a conduit 24 employed for introducing air under pressure from a conventional type of air supercharger.

The nozzle 2! is recessed to form a dome shaped chamber 25 connecting with the air and fuel mixing chamber. The chamber 25'is connected to the air chamber of the air supercharging passage 23 by ports 26 set at an inclination and converging towards each other where entering the chamber 25 so that the air under pressure will be delivered in the chamber 25 towards the center thereof.

The section A of the body 5 is provided With a metering pin chamber 21 in which is mounted a sleeve 28 having a rounded closed end 29 seated within a cup-shaped recess 30 formed centrally of the nozzle 2|. The rounded closed end 29 of the sleeve has a metering pin neck 3| which extends through a centrally arranged port in the nozzle to deliver fuel into the chamber 25 centrally thereof for mixing with the air received by way of the ports 26 and H. The neck 3| forms a seat for a metering pin 33 slidably mounted within an inner sleeve 34 mounted in the sleeve 28 and spaced therefrom by upper and lower collars 35 and 36. The lower collar 36 has a series of notches 3! to permit fuel to pass the lower flange and reach the neck 3| of the outer sleeve 28. It is to be understood that fuel under pressure is admitted to the outer sleeve by the port 28!, the latter being connected to a feed pressure source (not shown) in any well known manner. The flange 35 is also provided with notches to permit the fuel to pass down 7 between the sleeve 34 and the sleeve 28. The inner sleeve 34 projects above the. outer sleeve 28 and has arranged between its upper end andthe metering pin chamber 27' a packing 38 through which the metering pin 33 extends The section A of the body 5 is recessed, as

shown at 39, to receive the upper end of the metering pin and in which extends an operat ing lever pivoted on the sleeve 6', assh'own at 41. The sleeve 6 has a slot to permit" the lever 40 to extend therethrough. It is preferable that the lever be composedof sect-ions having telescopic fit with each other. One end of the lever 40- is pivoted to the meteringpin and the other end is pivotally connected to an adjustable connecting link 42' which is inturn' pivotally connected onto an arm 44 forming an integral part of the operating arm 21' of the throttle valve so that as the throttle valve is. moved away from a closed position, the metering pin also will be moved away from its seat to'admitfuel to the air and fuelimixing chamber and as the airpas-ses' into said chamber from all s-id'es-and the fuel centrally thereof, the fuel and air will become thoroughly mixed and rendered volatile to provide proper fuelmixture for theengine.

Asin'dicated at 4'5; fuelis'forcediinto the meteringpin chamber 21' under" pressure. It will be seen that the construction of carburetor described willeliminate the use of a choke and. also a float valve and associated'parts. and. that the fuel will'be proportionately admitted. to the mixing chamber as the throttle valve is. movedtowards open and" closed positions.

Referring. to my modified form of'my invention, the body of the carburetor is indicated-by the character 46an-d is composedoff detachably connected sections C" and D andth'e section-D isconstrueted'similarly to the section- Bflofi the body 5, the throttle valve being indicated'by thecha-racter '41? Also it will be noted that the sec-- tions" Can'd D" are detachably connected in the same manner as the sections'A and B The. section 0 has a metering pinv chamber 48 fediwith fuel by way of the. passage ili,v it beingunderstoodithat fuel is fedinto the meter.- in'g; chamber under pressure. Also, it will beseen that the chamber dB -is provided with the metering, pin sleeves 2B and 36 andthe metering pin 33'; It is to be notedthat. the-meter-- ing pin in either form of the carburetor is urged* into. seated. position by the ac'tion-of a co-ilwspring 49, The connection: between themeterin'gfpin': 33 of my; modified form of thein'vention'witm the. throttle valve is similar to the connection provided inthe form of my 'inventi-on shown in Figures 1 and 2 and it is, therefore, not thought necessary to again describe this construction in detail.

The section C of the body 66 is provided with a comparatively large recess in which is threaded a nozzle 50 having a gasket 5| interposed between itself and the inner wall of the recess. Between the nozzle and the body is defined an air chamber 52 fed with atmospheric air by way of passages 53' opening outwardly through the upper endof these'ction C of" the body 46. The nozzle 50 is provided with a dome-shaped portion 52 coactin-g with the flared recess 53 in the section D in forming the air and fuel mixing chamber. The dome-shaped portion of the nozzle has formed therein a series of ports 54 connecting with the air chamber 52. It will thereforeb'e seen that the air is admitted into the air and? fuel mixing chamber in converging relation and towards the center of said chamber. Also it will be noted that in this form of the inventionthe fuel is admitted to the dome of the nozzle centrally of the dome portionso' that fuel willbe' delivered axiallyof the air'and fuel mixmg chamber with" the incoming" air converging from all sides of the flow of fuel and thereby bring about a rapid and thorough commingling of the a-ir'and f'uel'to produce a desiredfuelmixture. for an engine; 30

are unnecessary and that the engine will receive 35' fuel mixture in accordanc'e'with its loads.

While I have shown and described the preferred embodiment ofmy' invention, it willbe understood that minor changes in construction, combination and arrangement of parts may. be made without departing'from the spirit and'scope of the invention as claimed.

Having. thus. described the invention, what I claim is: I v

In a carbureto-r,.-a body including recessed-separable upper and lower sections arranged in'ver tical endwise relation and coacting to provide a mixing'chamber and a throat withthe mixing chamber extending into both of said sections, the upper section having an air chamber a ecu-- pling sleeve detachably' joining said' sections, means for admit-ting air tothe air chamber, a throttle valve for controlling the throat, an annular member" threaded in and located at the upper end of the mixingchamber and 'including a substantially dome-shaped portion having acentrally arranged opening" and" a plurality'of ports grouped annularly about the" opening. and connecting theair chamber to the mixing chamher" for" directing air into said mixing chamber axially thereof, said dome-shaped portion hav ing -a seat in theupperfaoe'thereofj a fuel sleeve mounted inthe upper section and having arounded endengaging thesea't andprovided with an outlet neck extending through'the opening and providing a valve seat;- means for admitting liq uid fuel to said fuel sleeve, and a spring influenced. metering pinconnected toand operatedby the throttle val'veand supported in the sleeve" for coac-tion with the valve seat to cont-rolliquid fuel into the mixing chamber axially thereofi GLEMENT- DE GUYON?