Патент USA US2122348код для вставки
June 28, 1938. 2,122,348 A.‘ G. MAHRSTRGM . CARBURETOR Filed Feb. 23, 1937 2 Sheets-Sheet 1 .3 as $5’ 5 4 2° 23 32. )3? 3‘ '5’ in ‘3 28 \ 22. \4 s 12 )8 53 3a l 7 ‘2.5 ' 214 300. ‘B’ 2.0%. #213. June 28, 1938. A. G. MAHRSTROM . 2,122,348 CARBURETOR Filed Febfzs, 1957 37 - 2 Sheets-Sheet 2 @2. '9 34 0 Y 20 H lll/l/E/VTOR. JZIZZZWZ JVZahrsZ'r'a'm ‘Hi-23" Patented June 28, 1938 2,122,348 UNITED STATES PATENT OFFICE 2,122,348 I GARBURETOR Anton Georg Mahrstriim, Gothenburg, Sweden Application February 23, 1937, Serial No. 127,254 In Sweden June 11, 1934 3 Claims. This invention relates to carburetors for in ternal combustion engines. The: object of the invention is to provide an e?icient and economical carburetor working per fectly under all conditions. In the drawings:— Figure 1 is a side View of certain parts of the improved carburetor; ‘ Figures 2 and 3 are vertical sections through 10 the carburetor along planes perpendicular to each other and showing the air and fuel regulating members in, closed position; Figure 4 isv a section corresponding to Figure 3 of certain parts of the carburetor showing the 15 air and fuel regulating members in slightly open position, and Figure 5 a similar View showing the air and fuel regulating members in a more open position. The present embodiment of my invention com 20 prises an outer casing I having an axial passage (Cl. 261-45) in the drawings) so sized, that fuel flowing from the nozzle II through the tube I5 to the cham ber I‘! will in such a degree be mixed up with air entering through said air supply openings that a rich mixture of fuel and air will be produced. 5 The carburetor casing I is interiorly formed at its one end (near the ?oat chamber) with a cy lindrical portion I8 and, at its opposite end, with another cylindrical portion I9 of a smaller diam eter. Between said cylindrical portions the cas- 10 ing I is inte-riorly formed with a conical portion 2!). Within the carburetor casing I there is slid ably mounted a sleeve 2| provided at its one end with a wider cylindrical portion 22 ?tting in the wide cylindrical portion I8 of the casing I and, 15 at its opposite end, with a cylindrical portion 23 of an outer diameter substantially equal to the inner diameter of the narrow cylindrical portion I9 of the casing I. At its upper end the sleeve 2| has a bottom 25 with openings or slots 24 20 way 2. At its one (upper) end the casing l is: passing therethrough, which bottom carries a provided with a ?ange 3 for the connection of guide ring 26 slidable within the cylindrical por the casing to the suction pipe of an internal com tion IQ of the casing I. The wide portion 22 of bustion engine, and at its opposite (lower) end the sleeve 2| is near its open free end interiorly 25 the casing I is in a known manner provided with so shaped that on a certain distance, counted in a ?oat chamber 4. This chamber is provided with the direction of movement of the sleeve, its diam a fuel (petrol) inlet 5 and a. float 6 for the regu eter will successively diminish in the direction lation of the fuel level. At the end of the car against the said end, so that the annular open buretor casing I adjacent the ?oat chamber the ing or slot 28 (see Figure 4) formed between the 30. casing‘ has a bottom ‘I which at a distance from edge of the head I3 and the inner side of the its edge is provided with a socket-shaped por sleeve will successively increase when the sleeve tion 8 projecting into the casing l and perforated is moved in the direction toward the bottom ‘I. by a number of openings 9. Through a central In a similar way the socket-shaped portion 8 pro opening in the bottom ‘I a tube-shaped member jecting from the bottom ‘I is near the bottom ‘I 35 10 passes projecting down in the ?oat chamber (at 30) so formed that it grows wider in the di4 and provided at its lower end with a spray rection toward the bottom 1, so that the annular nozzle II for the petrol. The upper portion l2 slot or opening 30a formed between the sleeve 2| of the member Iii projects centrally into the and the socket-shaped portion 8 will diminish, casing I and is at its inner end formed with an when the sleeve 2| is moved in the direction to 40 enlarged head I3, between which and the upper ward the bottom ‘I. edge of the socket-shaped portion 8 of the bottom The carburetor casing l is provided with a series ‘I an annular slot or opening I 4 is formed. Within vof air inlet openings 3| distributed around the the lower portion of the tube-shaped member In casing and admitting the outer air to the annular there is centrally inserted a tube l5 with an outer space 32 between the middle portion of the casing 45, diameter slightly less than the inner diameter of I and the sleeve 2|. To a chamber 33 between said lower portion of the tube-shaped member It. the casing I and the socket-shaped portion 8 an At the upper end of the tube l5 side openings air inlet opening 34 passes, and in an air inlet l6 are provided passing to the annular chamber tube 35 communicating with said opening there I1 formed between the upper portion of the tube is provided an air regulating valve 36. 50 shaped member I!) and the socket-shaped portion To the sleeve 2| there is ?xed a pin 31 (see Fig8 of the bottom ‘I. To the space between the tube ures 1 and 2) the one end of which projects shaped member It) and thetube I5 there is con through a longitudinal slot 38 in the carburetor nected an air supply channel I511 (see Figure 2). casing I. Near said slot a pin 39 is ?xed to the This tube I5 is in a known manner perforated casing, and on said pin there is mounted a two 55 by a number‘ of air supply openings (not shown armed lever 40 the one fork-shaped arm M of 25 30 35 40 45 50 55 2 2,122,348 which embraces the projecting end of the pin 31, so that by swinging the lever 40 by means of the tributes to effect an intimate mixture between the other arm 42 in the one direction or the other the sleeve 2| will be moved in the one direction The outer enlargement 5|] of the socket-shaped or the other within the casing |. The device described works in the following manner:— In the position shown in Figures 2 and 3, in which the sleeve 2| is most remote from the bot 10 tom 1, the narrow portion 23 of the sleeve 2| en tirely or almost entirely closes the narrow, cylin drical portion IQ of the carburetor casing I, so that supplementary air from the air inlet open ings 3|, is prevented from ?owing to the suction 15 pipe of the engine. In this position of the sleeve 2| the edge or circumference of the head I3 con , tacts the inner side of the portion 22 of the sleeve 2|, so that the vacuum in the suction pipe of the engine, which vacuum is transmitted to the in terior of the sleeve 2| through the openings 24, can not be transmitted to'the annular chambers l1 and 33. In this position of the sleeve 2| (run ning light position) fuel is admitted to the inte rior of the sleeve through‘a channel v4i! (see Fig ure 2) passing to the upper side of the head |3 from a channel 44 communicating with the space between the tube I5 and the tube-shaped mem ber Hi. When moving the sleeve 2| in the direction to--‘ ward the bottom 1 there arises between the upper 20 ’ 25 30 edge of the upper, cylindrical portion 23 of the sleeve 2| and the inner side of the carburetor cas mg | an annular opening or slot 45 (see Figure 4) which increases to a certain limit as said movement proceeds and through which supple mentary air from the air inlet openings 3| is ad mitted to ?ow to the suction pipe of the engine. Simultaneously as at said movement of the sleeve 2| said opening ‘or slot 45 is formed, an annular opening or slot 28 arises between the head I 3 and the inner side of the wide cylindrical portion 22 of the sleeve, which opening or slot in a similar manner increases as the movement of the sleeve proceeds. Through said opening or slot 218 the 45 vacuum in the interior of the sleeve 2| is trans mitted to the chamber I1 inside the socket air and the fuel. ' portion 8 near the bottom ‘I has for its object to reduce the opening or slot 30a (see Figure 5) when the sleeve 2| is further moved in the direction to ward the bottom 1. By this the air admission through said opening will diminish and the vac uum in the chamber I‘! will increase with the effect that the fuel admission will increase thus 10 effecting a more rich mixture of fuel and air flowing to the suction pipe of the engine. To this position the sleeve 2| is brought on such occa sions when it is desired to increase the efficiency of the engine without respect to the economy. 15 The air inlet valve 36 normally occupies its open position. When starting‘ the engine the valve may occasionally be shut in order to effect a more rich mixture of fuel and air. Having now particularly described and ascer 20 tained the nature of my said invention and in what manner the same is to be performed, I de clare that what I claim is:— 1. An improved carburetor for liquid fuel com prising a casing provided at its one end with a 25 bottom and at its other end with an outlet ‘for the mixture of air and fuel, a slidable hollow sleeve within said casing adapted to regulate air openings in the walls of the casing and pro vided with an axial passage, means for moving 30 said sleeve within said casing, a nozzle outside the casing for atomizing the fuel and producing a rich mixture of fuel and air, a channel for con ducting said rich mixture through said bottom to an annular chamber formed between a mem ber projecting centrally from the bottom into the casing and a socket-shaped member encir cling said central member, an enlarged head at the inner end of said central member, an annu lar passage-way between said head and the inner 4:0 edge of said socket-shaped member, another an nular chamber between the casing and said sock et-shaped member, an air inlet passing to the last-mentioned chamber, and an interiorly coni cal portion of said sleeve encircling said head, 45 between the circumference of which and said conical portion there is formed an annular pas-' sage-way the size of which varies with the posi tion of the sleeve, and which passage-way forms communication between said annular chambers 50 shaped portion 8 and from there through the openings l6 and the tube l5 to the nozzle | |. The rich .mixture of air and petrol now‘ produced in 50 the tube l5 ?ows through the openings I6'to the the interior of the sleeve. . ‘ chamber H, where it meets and gets mixed with and 2. An'improved carburetor for liquid fuel com supplementary air entering through the open prising a casing provided at its one end with a ings 9, further through the opening or‘ slot I4, bottom and at its other end with an outlet for the where the mixture meets and gets mixed'with mixture of air and fueLVa slidable hollow sleeve 55 55 further supplementary air coming from the slot within said casing adapted to regulate air open 30a, and ?nally through the slot or opening 28 to ings in the walls of the casing and provided with the interior of the sleeve 2|, from where the mix an axial passage, means for moving said sleeve ture escapes through the openings 24 and to ' within said casing, a nozzle outside the casing gether with supplementary air ‘entering through for atomizing the fuel and producing a rich mix 60 the slot or opening 45 flows to the suction pipe of ture of ‘fuel and air, a channel for conducting said the engine. I ‘ It is evident that by adapting the shape of the sleeve portion 22 in a'suitable manner in rela tion to the shape of the portion 20 of the car 65 buretor casing |, the mutual relation between the size of the opening or slot 45, which deter mines the admission of air, and the size of the opening or slot 28, which determines the admis " sion of fuel, may be ‘so chosen that for each po sition of the sleeve 2| the most economical relation between fuel and air' isv obtained. The manner in which supplementary air is at differ _ ent points incorporated with the mixture of fuel 75] and air flowing through the carburetor con rich mixture through said bottom to an annular chamber formed between a member projecting centrally from the bottom into the casing and a socket-shaped member encircling said central 65 member, an enlarged head at the inner end of said central member, an annular passage-way between said head and the inner edge of said socket-shaped member, another annular chamber between the casing and said socket-shaped mem 70 ber, an air inlet passing to the last-mentioned chamber, means in said inlet for regulating the admission of air, and an interiorly conical por tion of said sleeve encircling said head, between the circumference of which and said conical por 3 2,122,348 tion there is formed an annular passage-way the size of which varies with the position of the sleeve, and which passage-way forms communication be tween said annular chambers and the interior of the sleeve. 3. An improved carburetor for liquid fuel com prising a casing provided at its one end with a bottom and at its other end with an outlet for the mixture of air and fuel, a slidable hollow 10 sleeve within said casing adapted to regulate air openings in the walls of the casing and provided with an axial passage, means for moving said sleeve in said casing, a nozzle outside the casing for atomizing the fuel and producing a rich mix 15 ture of fuel and air, a channel for conducting said rich mixture through said bottom to an annular chamber formed between a member projecting centrally from the bottom into the casing and a socket-shaped member encircling said central member, an enlarged head at the inner end of said central member, an annular passage-Way be tween said head and the inner edge of said socket shaped member, another annular chamber be tween the casing and said socket-shaped member, an air inlet passing to the last mentioned cham ber, an interiorly conical portion of said sleeve en circling said head, between the circumference of which and said conical portion there is formed an 10 annular passage-way the size of which varies with the position of the sleeve, and which passage-Way forms communication between said annular chambers and the interior of the sleeve, and chan nels passing through said socket-shaped member 15 between said annular chambers. ANTON GEORG MAHRsTRoM.