US1097401A - Jet-carbureter. - Google Patents

Description

P. DONNDORF.

JET CARBURETBR.

APPLICATION FILED IBB.11,1913.

1,097,401, I Patented May 19, 1914.

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PETER DONNIDORF, OF STUTTGART, GERMANY, ASSIGNOR TO THE FIRM 0F DAIMLER- IVIOTOREN-GESELLSOHAFT, OF UNTERTilRKI-IEIM, GERMANY.

JET-CARBURETER earner.

T all Q/JiLOHZ it may concern p Be it known that I, Pnrnn DONNDORF, a subject of the King of Wurttemberg, residing at liandhausstrasse', Stuttgart,- Germany, have invented an Improved Jet-Carbureter, of which the following is a specification.

This invention relates to an improved jet carburetor for internal combustion engines and relates to that type of carbureter in which, when the engine is running idly or at a low speed, the jet. chamber is connected with the mixing chamber leading to the engine by means of a narrow tube or passage with the object of diminishing the consumption of fuel in proportion to the work done. in carbureters of this type, however, on increasing the speed, the fuel overflows from the jet owing to the variation in pressure in the jet chamber.

The object of the present invention is to utilize the fuel overflowing from the jet and for this purpose the jet is surrounded by a chamber open to the jet chamber and adapted to collect the fuel overflowing from the jet, the fuel collecting or overflow chamber being connected to the mixing chamber by a narrow passage so that when the engine is running idly, fuel will be drawn from said overflow chamber.

In order that the invention may be more clearly understood, reference made to the accompanying drawing showing one embodiment of the invention by way of example.

Figure 1 is a vertical section through the carburetor showing the throttle valve in open position. Fig. 2 is a horizontal section through the throttle valve, and Fig. 3 is a view similar to Fig. 1 showing the throttle valve in the position it assumes when the engine is running idly.

a designates the air-supply chamber of the carbureter within which is arranged an open tube or conduit Z) constituting the jet chamber, said conduit being open at one end to the air-supply chamber a: and at its other end opening by way of a cylindrical connection 7) into the mixing chamber 0 which is connected to the engine. Fuel is supplied to the jet chamber 7) from a float chamber f through a jet nozzle 1 projecting into the jet chamber 7) and, surrounded by a chamber 1 which is open to the jet chamber Z; through an annular opening or open Specification of Letters Patent.

her it and be collected therein.

Patented May l 9, 1914b Application filed February 11, 1913. Serial No. 747,773.

ings d in the jet chamber Z), so that any 6X1 cess fuel escaping from the jet 9 will fall down through the opening (Z into the cham- The lower end of the chamber 72. is connected to the to mixing chamber 0 by means of a narrow tube or passage '5 opening into the cylindrical connection Z). The communication between the jet chamber Z) and the mixing chamber 0 is adapted to be throttled more at or less according to the desired engine charge and the speed of the engine by means of a preferably cylindrical throttle valve is slidable within a preferably cylindrical casing a in alinement with the cylindrical conto nection b and having a port a therein adapted to register with a port m in the valve easing 6 when the valve 7: is in its fully open position, illustrated in Fig. l, in which case secondary air is supplied to the mixing re chamber 0 through the registering ports at and n from the air chamber a.

When the engine is to run idly, the valve In is moved within the valve casing a so as to cut off direct communication between the so jet chamber 6 and the mixing chamber 0, as illustrated in Fig. 3, a small quantity of air, however, being capable of passing to the mixing chamber 0 from the jet chamber 7) through a small notch, slot or like orifice o in the valve is. This notch or slot 0 isadapted to register with the outlet orifice of the tube or passage 2' so that, owing to the suc tion of the engine, the fuel collected in the chamber it will be drawn through the tube i and simultaneously atomized by the air passing through the notch or slot 0 from the jet chamber 6 to the mixing chamber 0.

In order to stop the engine, the valve 70 is moved farther toward the left relatively to to Fig. 3 of the drawings until the notch or slot 0 is closed by the cylindrical connection Z).

l claim 1. A jet carburetor for internal combus- 09 tion engines comprising, in combination, a fuel jet nozzle, an air conduit at right angles thereto, a mixing chamber at right an gles to and connected to said air conduit, an overflow chamber surrounding said nozzle and in communication with said air conduit, a fuel passage leading from the bottom of said overflow chamber and opening at a point intermediate said air conduit and mix ing chamber, a valve'casing in alinement withsaid air conduit, a slidable throttle valve therein adapted, when moved toward said air conduit, to gradually cut-off communication between said air conduit and mixing chamber, said valve having a notch adapted, when the valve is nearly closed, to register with said passage and thereby maintain communication between said air conduit and mixing chamber over said passage.

2. A jet carbureter for internal combustion engines, comprising a jet chamber, an air chamber into which said jet chamber opens at one end, a mixingchamber, a cylindrical connection between said jet chamber and mixing chamber, a fuel'jet nozzle projecting into saidtjet chamber, a fuel overflow chamber surrounding said nozzle and open to said jet chamber, a narrow tube connecting the lower end of said fuel overflow chamber with said cylindrical connection, a cylindrical ported valve casing in alinement with said cylindrical connection, to which secondary air is supplied through said port from said air chamber, and a cylindrical sliding ported valve in said valve casing adapted to control-the port therein and to throttle the connection between said jet chamber and said mixing chamber and having a notch adapted toregister with the outlet end of said tube and to simultaneously establish communication over the outlet end of said tube between said jet chamber and mixing chamber.

In testimony whereof I aflix my signature in presence of two witnesses.

. PETER DONNDORF.

Witnesses:

ROBERT UNLAND, ERNEST ENTENMANN.

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