US2078029A - Carburetor for internal combustion engines - Google Patents

Description

April zo, 1.937.

l. sCHoRscH 2,078,029

CARBURETOR FOR INTERNAL COMBUSTION ENGINES Filed March 7`, 19:56

Ignaz Scarsc/p- BX gworney.

Patented Apr. 20, 1937 UNITED iSTATES cARBUREroR Fon INTERNAL coMUs'rIoN ENGINES Ignaz Schorsch, lPrague', Czechoslovakia Application March 7, 1936, serial No.- 67,729

In Germany March 8 1935 6 claims. (ci. zei-s1) The present invention relates to improvements in carburetors for internal combustion engines and has for its object to provide a carburetor with which a-complete mixture of fuel and air is en- 5 sured by means of mechanical disintegration of the fuel drawn in. f

According to the invention, the fuel is no longer sprayed into the flow of air drawn in as in the known carburetors, but is conducted, in `a path l having multiple diversions, to the rst of a plurality of mixing and atomizing chambers which" are telescopically arranged one behind the .other `in the direction of flow of .the air enteringas a result of suction action, the said-chambers being l open against the direction of flow of air, that is on the air intake side, and covered on the throttion in a conducting bush the end of which lies against the atomizing chambers being controlled .30 by a Valve, but the flowing through sectional l area of this bush is regulated by a valve needle lying in this bush. The mantle of this needle has a generatrix, which is formed according to a distinct curved line, so that the quantity of fuel is no more directly regulated by the lifting distance of the valve from its seat but merely by the ring-like flowing through section constituted by the needle and the inner side of the bush.`

In order-that the invention may be more clear'- 1y understood two embodiments thereof will now be described by way of example, with reference to the accompanying drawing wherein, Fig. 1 is a vertical section of one embodiment, Fig. 2 a section on the line II-II of Fig. l, and Fig. 3 a plan and part section on the line III--III of Fig. l2.Y

Fig. 4 is a part vertical section of the other embodiment. Fig. 5 is a cross sectional view taken on the section line V-V' of Fig. 4.

Referring to the drawing the carburetor consists of two parts 6,1, joined together by means of a web 5 and communicating through a tube 26, the part 6 being equipped for the adjustable admission of the fuel and the part 1 for the formation of the mixture of fuel and air and for conveying the mixture.

vtube which lies in the axial direction of the part 1,

' The inlet aperture -8 for the'fuel, inl the part 'y 6is provided with a filter 9 and is continued inthe l form of a` horizontal passage I0, from which the l fuel reaches a vertical channel. I2,A the quantity passingl'ibeingfregulated by a needle II.'A The in- 5.

ner endof this Ychannel I2 corresponds with an aperture l'in the shell part I5 of abush- I5, I6.

" The inneriwall'of the bush I5, I6 is provided'with Y avalve-seating v-I`4, so that the inner diameterv -f oftliepart' I5 ofthe bush issmallerthan the-1.0

inner. diameter'ofthe part I6 of said bush.

u 'The'valve'body vI1 has a needle.,- I8 projecting lintofthef closed-off bush part I5 and'tap'ering off towards its end, and has a'spindle I9 located Within the bush part I6, against which spindle 15! -pressesla spring 20 which is `supported against f the cover .2| of the bush part I6. Throughthe cover2I passes the stem 22-of the spindle I9.. `The needle I8 hasa generatrix, which is formedl according toa distinct curved line. :,Thus by 20l lifting the valve a. ring like owing through sec'- f tion Ior the fuel is formed between the needle vand the inner wall of the bush-part I5 before the valve and so conditions are performed for conductingsuch a quantity of fuel as is neces- 25` sary to be mixed with the airtaken in by suction-action.

In thev vicinity of the valve seating I4, the inner wall of the bush part I6 is provided with an annular groove 23 which is continued inthe 30 form of an aperture through the bush, the aperture corresponding with an aperture 24 provided in the web 5 and'openin'g into the part 1. y v

'r In the part 1 is a bush 2 5 provided with an aperture concentric with the aperture 24 in the 35 web 5 and in'which is tted the radial part of an elbow tube 26 which forms an extension of the aperture 24. At the horizontal part of the elbow isvsecured a boss member 21 of a fork 28 extend- 0 ing out from this in an axial direction. 'I'he insides oftlie fork legs are stepped, and each step klength 29 terminates in a short slot 30 in the ad.-v

joining part of the fork leg. In these slots fit the ends of hollow truncated conical ,members 3|, 32, 33, 34, the ends of which projecting into the range of the next step are permeably closed by narrow mesh wire gauze 35.

In this manner a plurality of chambers are 50.. formed in the part4 which chambers t one inside the .other telescopically, and are open at one end and permeably closed at the other end. Into the rst of these chambers the fuel is conducted in a regulated quantity through the elbow tube 55 PATENT OFFICE 26, whilst the air is led through the funnel 50 of the air intake, into said chambers.

By means of this device the formation of the mixture of fuel and air is divided between thel 5 chambers 3I3Q, and it will be readily appreciated that in consequence of the action of the wire-gauze 35 successive atomizations of the fuel are effected, which results in an intimate mixture of the fuel with the air.

The entrance of the fuel and of the air is brought about by means of the vacuum prevailing in -the carburetor chamber, which vacuum is regulated in the known manner by means of the throttle valve 36 mounted in the part 1.

In order to adjust the valve body l1 for a certain quantity of fuel in dependence upon the position of the throttle valve, the following arrangement is for example provided: On the shaft of the throttle valve 36 is fitted a lever 31; which drivers seat of the vehicle. On this lever 31 is linked a lever 38, which is connected by means of a screw to an auxiliary piston 40 guided in the part 6 and loaded with the spring 39. 'I'he rod 4| of this piston is connected to the stem 22 of the valve spindle I9 by means of a tie member 5I. In this way is effected a displacement ofthe valve body I1 exactly in an axial direction.

For the sake of completeness it may be added that the part 6 mayfbe provided with an auxiliary air inlet 42 adjustable by meansof the screw needle 52. The construction of the carburetor illustrated in Figure 4 differs from that described above,

only by reason of the fact that the mixing chambers 3|', 32', 33', are cylindrical instead of being of truncated cone shape. The latter shape is to be employed fortspecically heavier fuels, the former (Figure 4) for specically lighter 40 fuels. There will also be cases in which both forms of the chambers can be advantageously used in one carburetor, similarly the number of these chambers may vary according to circumstances.

What I claim is:

l. A carburetor for internal combustion engines comprising a throttle, an air intake, a plurality of mixing and atomizing chambers located between said throttle and said air intake and arranged telescopically one behind the other, said chambers being open on the air intake side and closed by permeable means on the throttle side and means for leading fuel to the mixing and is actuated in the well known manner from the' ao'zaofaar atomizing chamber located nearest to said air intake.

2. A carburetor for internal combustion engines comprising a throttle. an air intake, a plurality of mixing and atomizing chambers located between said throttle and said air intake and arranged in overlapping relation, said chambers being open on the air intake side and closed by permeable means on the throttle side and means for leading fuel to the mixing and atomizin chamber located nearest to said air'intake.

3. A carburetor for internal combustion 'enlgines comprising a throttle, an air intake, a plurality of miidng and atomizing chambers located between said throttle and said air intake and arranged Ytelescopically `one behind the other, said chambers being of truncated conical shape and being open on the air intake'side and closed by permeable means on the throttle side and means for leading fuel to the mixing and atomizing chamber located nearest to said air intake.

4. A carburetor for internal combustion engines comprising a throttle, an air intake, a plurality of mixing and'atomizing chambers located between said throttle and said air intake and arranged telescopically one behind the other, said chambers being of cylindrical shape and being open on the air intake side and closed by permeable means on the throttlev side and means for leading fuel to the mixing and atomizing chamber located nearest to said air intake.

5. A carburetor for internal combustion engines comprising a throttle, an air intake, a plurality of mixing and atomizing chambers located between said throttle and said air intake and arranged in overlapping relation, said chambers being open on the air intake side and closed by fine mesh wire gauze on the throttle side and means for leading fuel to the mixing and atomizing chamber located nearest to' said air intake.

6. A carburetor as set forth in claim l in which the means for leading fuel to the mixing and atomizing chamber comprises a conduit of multiple diversions, a bushing therein, a valveneedle located in said conduit having a generatrix in accordance with a curved line and forming with the inner wall of said bushing a circular opening whose cross sectional area is variable and means for varying said cross sectional area in accordance with the movements of said throttle.

IGNAZ SCHORSCH.

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