Andreas Stihl Ag Co. Kg

Andreas Stihl Ag & Co.

Horst Denner

Florian Hoche

Niels Kunert

Helmut Zimmermann

Johannes Menzel

Wolfgang Luithardt

André Prager

Hans Holderle

Bernd Kn&ouml;dler

Martin Christoph Arenz

Felix Servatius

Stefan Kummermehr

Dr Martin Christoph Arenz

A mixture formation unit has a base body in which an intake channel section is formed. The intake channel section extends from a first end side of the base body to a second end side of the base body. The mixture formation unit has at least one rectilinearly extending channel which opens into the intake channel section. The channel opens at the first end side of the base body. The mixture formation unit is preferably provided for a two stroke engine whose intake channel is divided downstream of the mixture formation unit into a mixture channel and an air channel.

Mixture formation unit and two stroke engine having a mixture formation unit

A cylinder for a two-stroke engine has a cylinder wall defining a cylinder interior. A cylinder head closes of a combustion chamber in the cylinder interior. An exhaust is connected to the cylinder interior. At least one transfer passage having a transfer port opens into the cylinder interior. The at least one transfer passage is disposed in the cylinder wall for connecting a crank case of the two-stroke engine to the combustion chamber. The at least one transfer passage has at the level of the transfer port at least one flow deflecting rib having a radial spacing from the transfer port in a radial outward direction relative to a longitudinal cylinder axis.

Cylinder for a two stroke engine

A two-stroke engine includes an air channel for supplying substantially fuel-free combustion air and a mixture channel for supplying an air/fuel mixture. The air channel and the mixture channel connect the cylinder of the two-stroke engine to an air filter. A section of the mixture channel and a section of the air channel are guided in a common component. In order to prevent induction of mixture into the air channel, the length (a) of the mixture channel and the length (b) of the air channel are so matched to each other that the pressure wave in the air channel, which forms during operation, oscillates in phase with the pressure wave formed in the mixture channel. The length (a) of the mixture channel is matched to an optimal fuel induction via the fuel opening. A method for tuning the two-stroke engine provides that the length (a) of the mixture channel is matched to an optimal fuel discharge from the fuel opening in a first step and, in a second step, the length (b) of the air channel is so matched to the length (a) of the mixture channel that the pressure wave in the air channel and the pressure wave in the mixture channel oscillate in phase during operation of the two-stroke engine.

Two-stroke engine assembly

A cylinder for an internal combustion engine of a manually guided implement, and a method of producing such a cylinder, are provided. A cast cylinder body that peripherally delineates a cylinder chamber has formed therein at least one transfer channel that is open inwardly into the cylinder chamber and includes a central portion, extending approximately parallel to the cylinder axis, and a head portion that above the central portion faces in the direction of the cylinder chamber. A cylindrical sleeve covers the central portion of the transfer channel inwardly in the direction of the chamber. The sleeve extends in the direction of the cylinder axis beyond the central portion and ends below the head portion.

Cylinder for an internal combustion engine of a manually guided implement

The invention is directed to an arrangement of an air filter (,) and a membrane carburetor (,). The membrane carburetor (,) has an intake channel section (,) configured in the carburetor housing (,) and fuel-conducting channels (,) open into the intake channel section (,). The channels (,) are supplied from a fuel-filled control chamber (,) which is configured in the carburetor housing (,). The control chamber (,) is partitioned from a compensation chamber (,) via a control membrane (,). The compensation chamber (,) communicates with the housing (,) of the air filter (,) via a compensation channel (,) downstream of an air filter element (,). The air filter housing (,) engages over the membrane carburetor (,) essentially on the side of the compensation chamber (,) and the clean chamber (,) of the air filter housing (,) communicates with the intake channel section via a connecting stub (,) which lies approximately at right angles to the intake channel section (,). The connecting stub (,) is used as a connection between the clean chamber (,) of the air filter (,) and a flow space (,) mounted forward of the intake channel section (,) in order to ensure a reliable compensation where available space is tight. The volume of the flow space (,) is greater than the volume of the connecting stub (,) and the compensation channel (,) branches away from the flow space (,).

Arrangement of an air filter and a membrane carburetor

Growing community of inventors

Weinstadt, Germany

Horst Denner