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US 4,379,770 AGranted
Carburettors for internal combustion engines
AssigneeBosch & Pierburg System oHG
InventorsValerio Bianchi, Anwar Abidin, Dieter Thonnessen
Life of this patent
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AssigneeBosch & Pierburg System oHG
InventorsValerio Bianchi, Anwar Abidin, Dieter Thonnessen
Estimating the term…
A constant pressure carburettor comprises a mixing chamber 2 which is surrounded by a heating jacket 12, an operator controlled throttle valve 3 at the downstream end of the chamber 2, a fuel feeder 5, 6 at the upstream end of the mixing chamber and a choke valve 10 at an air inlet to the carburettor. The choke valve 10 is, in use, controlled automatically by the air flow into the carburettor in dependence on the opening of the throttle valve 3 and the speed of the engine to which the carburettor is fitted. The choke valve 10 tends to produce vortices or turbulence in the air flow and this tends to cause the fuel supplied by the feeder 5, 6 to the wall of the chamber 2 to be prematurely removed before it is heated. This adversely affects the vaporization of the fuel and the formation of the air-fuel mixture. To avoid turbulence or vortices in the chamber 2, a stabilization conduit 16 is provided between the choke valve 10 and the fuel feeder 5, 6. The conduit 16, which preferably has two right-angle bends as shown, damps out or at least decreases the vortices or turbulence in the air flow before it reaches the mixing chamber 2.
A constant pressure carburettor for an internal combustion engine, said carburettor comprising a tubular wall defining a main air flow path and a mixture chamber, fuel feeder means at the upstream end of said chamber for supplying fuel in a substantially uniform circumferential distribution onto said tubular wall, a main throttle valve downstream of said mixture chamber, means forming a heating wall in a part at least of said tubular wall between said fuel feeder means and said main throttle valve, a choke valve disposed upstream of said fuel feeder means, a metering element which regulates the rate of fuel flow from said fuel feeder means, means for opening said choke valve in dependence upon the magnitude of the air flow along said main air flow path and means operatively connecting said choke valve and said metering element to actuate said metering element in dependence upon the opening of said choke valve, means defining an air flow stabilising conduit extending between said choke valve and said fuel feeder means, said stabilising conduit being operatively constructed to damp out or decrease vortices generated in said air flow by said choke valve before said air flow reaches said mixing chamber.
Dependencies are inferred from the claim text.