Internal combustion engine having a diaphragm carburetor and adjustable CO level
AssigneeAndreas Stihl AG & Co. KG
InventorHeinz Hettmann
Life of this patent
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Abstract
An internal combustion engine, especially a two-stroke engine in manually-guided implement, is provided. A piston that is disposed in a cylinder delimits a combustion chamber and by means of a connecting rod drives a crankshaft disposed in a crankcase. A fuel/air mixture is supplied to the engine via a diaphragm carburetor, the control chamber of which is delimited by a control diaphragm that controls a feed valve. Formed on the dry side of the diaphragm is a compensation chamber that communicates via a flow path with a source of pressure that pulsates as a function of engine speed. Disposed in the flow path is a check valve. The compensation chamber is to be relieved by a pressure-regulating valve disposed in a further flow path.
Claims9
An internal combustion engine, which has a cylinder and a crankcase, wherein a piston, which reciprocates in the cylinder, together with the cylinder delimits a combustion chamber, and wherein said piston drives a crankshaft that is rotatably mounted in the crankcase, said internal combustion engine further comprising:
- a diaphragm carburetor for supplying a fuel/air mixture for operation of said internal combustion engine, wherein said diaphragm carburetor is provided with a control diaphragm that delimits a control chamber to which fuel flows via a feed valve that is controlled by said control diaphragm, wherein said control diaphragm, on a dry side thereof remote from said control chamber, also delimits a compensation chamber, wherein said compensation chamber communicates via a flow path with a source of pressure that pulsates as a function of a speed of said internal combustion engine;
- a check valve disposed in said flow path between said source of pressure and said compensation chamber;
- and
- a pressure-regulating valve that is provided in a further flow path for relieving said compensation chamber.
Dependencies are inferred from the claim text.