US2294847A - Carburetor - Google Patents

Description

Sept. 1, 1942. F. JECK CARBURETOR Filed April 24, 1940 2 Sheets-Sheet l lllllllllllllll Sept. l, 1942.

2 sheets-sheet 2 HIIHI Patented Sept. 1, 1942 UNITED STATES :Parri:Nr orrlcs Application Apr124, 1940,seria1Np. 331,470 In Switzerland February 7, 1940 2 Claims. (C1. zei- 49) The present inventionv relates to a .carburetor which can be used for light and heavy fuel, in which two throttle valves are respectively provided in the two limbs of a substantially U- shaped passage :for the air-fuel mixture, Ia needle-controlled rfuel nozzleoperated by a slidable control member, opening into one of the limbs of the Vpassage between the said valves. The essence of the invention lies in the features that the U-shaped passage is arranged in a horizontal plane so that its two limbs (inlet passage and outlet passage) lie side by side and that the axes of the two throttle lvalves are transverse to one another and are coupled by a common linkage to the said control member in such a way that when the latter is moved in Ya direction to open or close thel needle controlled nozzle the two throttle valves are simultaneously actuated in the same sense.

An example of embodiment of the invention is illustrated in the accompanying drawings- Figure 1 shows the [complete carburetor in vertical section on the line I-I of Figure 2;

Figure 2 is a horizontal section on the line II-II of Figure 1;

Figure 3 is a side elevation of the carburetor and Figures 4 and 5 show details on an enlarged scale.

The carburetor shown in Figures 1-3 comprises a body I containing a substantially U-shaped through-passage for the air-'fuel mixture, arranged in a horizontal plane. In this way the two limb passages lie side by side of which one will be hereinafter referred to as the inlet passage Ia and the other as the outlet passage 2. On the mouth of the inlet passage Ia is set an air strainer 3 and immediately succeeding this an fair intake valve 4 having a horizontal axis is provided in the inlet passage. 2 is provided a mixture throttle valve 5 having a vertical axis. These two valves 4 and 5, the axes of which are thus .perpendicular to one another, are coupled together by a common linkage and are actuated simultaneously in the same sense. This linkage includes two lever arms 6 and E releasably secured on the spindles of the respective valves 4 and 5, -whereby -a relative adjustment of the valves can be eiected so that for example when one valve is completely closed the other is not yet quite closed. A needle-controlled fuel nozzle 8 :communicating with the oat ychamber l, opens from below into the inlet passage Ia and its control needle 9 projects upwardly out olf the inlet passage and is there un- In the outlet der the action oi a helical spring I0 which urges it upwards off 'its seat on the mouth of the nozzle. I n

On the body I is an angle form guide block II for a slidable wedge I2 serving to control the needle 78, which block carries tWo upwardly directed bolts lf3 the headso'f which vengagein a Tslot in the wedge. By turning theIbOlts I3 'and locking themA` bythe nuts I4, the position of the wedge can be vertically adjusted. As cian be seen from Figure 3, the `wedge I2 lcomprises a horizontal 'control surface I2a and a sloping control surface I2b. In one end position of the wedge I2 corresponding with the closed position of the nozzle a spring pressed knob I5 carried in the wedge presses on the needle 9 and holds the latter on its seat against the action of the spring I0. To the wedge I2 is coupled a pullrod I6 to which the linkage 6 of the two throttle valves 4 and 5 is coupled through a'compresson spring IE5a .carried in a tubular housing. The other end of the pull rod I6 is connected to a :foot pedal or the like not shown. When the rod IE is pulled by the foot pedal, the sliding of the wedge I2 in thesame direction first moves knob I5 out of action so that the needle 9 rises until it abuts the horizontal control surface I2a or the wedge I2. Upon further movement of the wedge I2, owing to the horizontal surface I 2a the needle 'at first remains in the same yposition whereas the two valves progressively open, until sloping surface I2b reaches the needle and thereafter the needle 9 gradually rises and the two valves 4 and 5 continue to open until their full open position is reached. Owing to the interposition off the compression spring I6a it is possible for the wedge I2 to continue morving after the two valves 4 and 5 have reached their full open position where they are checked by a stop 25 (Fig. 2), the spring |63 then closing up.

As Figures 4 and 5 show, the needle controlled nozzle 8 is provided with a conical plug I1 having a central bore into which open four horizontal passages of different cross sections, set at.90 to one another. HIhis plug is provided below with a hand knob I8 having a waved abutment face. The plug IIvis held in its working position in a screw sleeve 24 constructed as a plug seating, by means of a spring I9, by means of the knob I8 the nozzle can be set for a fuel flow corresponding to any one of the four passages in the plug. Beyond the nozzle 8 an exchangeable idling nozzle 28 is provided which when the carburetor is assembled projects into a bore located between the two passages Iav and 2 By rotating the plug I'I,V

and communicating with passage 2 (see Figures 1 and 2).

It can further be seen from Figure 4 that the needle 9 has a cylindrical portion 9a cooperating with the bore of the nozzle 8 to give a minimum passage for fuel. In order to obtain satisfactory Working of the carburetor when operating with heavy fuel (raw oil) it must be so adjusted that the complete withdrawal of the cylindrical part 9a from the nozzle passage only takes place when the beginning of the sloping surface I2b of the wedge I2 comes into engagement with the upper end of the needle 9.

In the space between the passage Ia and the passage 2, as shown in Figure 2, an electric heating coil 2| is arranged the purpose of which is to preheat the fuel-air mixture before it reaches the engine, 22 is a spraying nozzle through which if desired water vapour can be admixed with the fuel-air mixture, and 23 is an adjustable nozzle for additional air. I

The described carburetor is particularly suitable for motor vehicle and can Abe operated not only with gasoline but also with raw oil.

What `I claim is:

1. Ina carburetor the combination of a body, a U-shaped through passage therein set in a horizontal plane with its limb passages lying side by side, two valves arranged respectively in said limb passages, with their axes perpendicular to one another, a fuel nozzle porjecting into one of said passages between said valves, a needle slidable within said nozzle, having a cylindrical portion which in cooperation with the nozzle bore constitutes the minimum outlet area and a tapered portion, a slidable wedge controlling the movement'l of said needle in said nozzle, said wedge including an operative surface parallel with its sliding direction and a sloping operative surface succeeding said rst named surface, said needle and surfaces being so related that said cylindrical portion is completely withdrawn from said nozzle when the beginning of said sloping surface comes into action, and means interconnecting said sliding Wedge and said valves Whereby said valves are opened and closed simultaneously with the opening and closing of the nozzle by the needle.

2. A carburetor as set forth in claim 1 also including stop means for checking the movement of said valves when they reach full open position, and yielding means in said interconnecting means whereby the sliding of said wedge can be continued after said valves reach full open position, said wedge being directly actuated and continued movement thereof further opens the fuelnozzle to enrich the mixture at full throttle.

FRITZ JECK.

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