Andreas Stihl Ag Co. Kg

Andreas Stihl Ag & Co.

Peter Schmidt

Gerhard Osburg

Wolfgang Luithardt

Reinhard Gerhardy

Tommy Roitsch

Michael Joos

Dimitrios Galagas

An internal combustion engine has a supply channel for supplying combustion air. A throttle element is arranged in the supply channel. The engine has a starter device which enables a defined free flow cross section in the supply channel in a starting position. The starter device latches in the starting position and the latching is released by actuating an operator-controlled element. A first ramp controls the free flow cross section of the fuel port depending on the position of the throttle element. The free flow cross section of the fuel opening is controlled by a second ramp. The free flow cross section of the fuel opening, which is set using the second ramp, is greater than a flow cross section set using the first ramp for the same position of the throttle element. A favorable performance of the engine after starting thereof is achieved.

Internal combustion engine having a starter device

A two-stroke engine has a cylinder with a combustion chamber that is delimited by a reciprocating piston that drives with a connecting rod a crankshaft rotatably supported in a crankcase. In predetermined positions of the piston, the crankcase is connected by at least one transfer channel to the combustion chamber. The two-stroke engine has a mixture channel for supplying a fuel/air mixture and an air channel that supplies substantially fuel-free air to the transfer channel. In order to provide a simple adjustment of the air channel to different two-stroke engines of a model range, a component in which the air channel is formed has a throttle member that is arranged at an end face of the component. The throttle member throttles the air flow through the air channel in at least one operating state of the two-stroke engine.

Two-stroke engine

A blower () has a housing () to which a blower pipe () may be removably connected. An internal combustion engine located within the housing () drives a blower wheel. The blower wheel, in turn, generates an air flow () within the blower pipe. To reduce the exhaust gases and the fuel consumption during idle operation of the combustion engine, a reduction device (), located in the blower pipe downstream of the blower wheel reduces the clear cross section of flow during idle operation of the engine.

Blower having a blower tube incorporating a reduction device for reducing the clear flow cross section of said blower tube at idle operation

A membrane carburetor for an internal combustion engine in a portable handheld work apparatus includes a control chamber ( ) delimited by a membrane ( ). The control chamber ( ) is connected via a feed line ( ) to a fuel tank ( ). The feed line ( ) is cleared via a valve body ( ) when there is a deflection of the membrane ( ) because of an underpressure in the control chamber ( ). The control chamber ( ) is connected to an air channel ( ) via at least one fuel nozzle ( ) and at least one ancillary chamber ( ). The air channel ( ) passes through the membrane carburetor ( ) and leads to the internal combustion engine. A purge pump ( ) is provided in a fuel line ( ) connecting the control chamber ( ) to the fuel tank ( ). The fuel path between the control chamber ( ) and the purge pump ( ) is guided through at least one ancillary chamber ( ).

Growing community of inventors

Waiblingen, Germany

Peter Schmidt