Diaphragm carburetor
AssigneeAndreas Stihl AG & Co. KG
InventorAndre Prager
Life of this patent
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Abstract
A diaphragm carburetor for an internal combustion engine of a hand-guided power tool has a carburetor housing having an intake passage section and at least one fuel opening that opens into the intake passage section. A control chamber is arranged in the carburetor housing and supplies fuel to the at least one fuel opening. A control diaphragm delimits the control chamber. A valve controls fuel supply to the control chamber, wherein a position of the valve depends on a deflection of the control diaphragm. A device that counteracts a hydrostatic pressure difference between the at least one fuel opening and the control chamber in at least one position of the diaphragm carburetor is provided.
Claims19
A diaphragm carburetor for an internal combustion engine of a hand-guided power tool, the diaphragm carburetor comprising:
- a carburetor housing having an intake passage section;
- at least one fuel opening that opens into the intake passage section;
- a control chamber supplying fuel to the at least one fuel opening;
- a control diaphragm delimiting the control chamber;
- a valve controlling fuel supply to the control chamber, wherein a position of the valve depends on a deflection of the control diaphragm;
- a device counteracting a hydrostatic pressure difference between the at least one fuel opening and the control chamber in at least one position of the diaphragm carburetor.
A diaphragm carburetor for an internal combustion engine of a hand-guided power tool, the diaphragm carburetor comprising:
- a carburetor housing having an intake passage section;
- at least one fuel opening that opens into the intake passage section;
- a control chamber supplying fuel to the at least one fuel opening;
- a control diaphragm delimiting the control chamber;
- a valve controlling fuel supply to the control chamber, wherein a position of the valve depends on a deflection of the control diaphragm;
- a device counteracting a hydrostatic pressure difference between the at least one fuel opening and the control chamber in at least one position of the diaphragm carburetor;
- wherein the device comprises a lever supported in the control chamber so as to be pivotable about a pivot axis, wherein the lever has a first end and a second end positioned opposite one another relative to the pivot axis, wherein the valve has a valve body arranged on the first end of the lever, wherein the control diaphragm is arranged on the second end of the lever;
- and
- wherein the valve body and the control diaphragm are arranged and adjusted relative to one another such that a resulting force acting on the control diaphragm counteracts the hydrostatic pressure difference between the at least one fuel opening and the control chamber.
A diaphragm carburetor for an internal combustion engine of a hand-guided power tool, the diaphragm carburetor comprising:
- a carburetor housing having an intake passage section;
- at least one fuel opening that opens into the intake passage section;
- a control chamber supplying fuel to the at least one fuel opening;
- a control diaphragm delimiting the control chamber;
- a valve controlling fuel supply to the control chamber, wherein a position of the valve depends on a deflection of the control diaphragm;
- a device counteracting a hydrostatic pressure difference between the at least one fuel opening and the control chamber in at least one position of the diaphragm carburetor;
- wherein the device comprises a liquid column acting on the control diaphragm to counteract the hydrostatic pressure difference between the at least one fuel opening and the control chamber in the at least one position of the diaphragm carburetor;
- and
- wherein the device comprises a first auxiliary diaphragm arranged on a side of the control diaphragm facing away from the control chamber, wherein the liquid column acts through the first auxiliary diaphragm onto the control diaphragm.
Dependencies are inferred from the claim text.