Andreas Stihl Ag Co. Kg

Tobias Deigendesch

Sebastian Hanussek

Felix Mayer

Michael Schneider

Jan Pawlowski

Robert Koehli

Tilman Seidel

Georg Maier

Florian Hoche

Patrick Levien

Michael Dietenberger

Jörg Elfner

Alexander Klein

Isgard Sabelberg

Ulf Bannick

Sebastian HANUßEK

A two-stroke engine includes a cylinder having a combustion chamber. The combustion chamber is delimited by a piston guided in a reciprocating manner in the cylinder and drives a crankshaft. A first intake channel opens into the crankcase interior. A transfer channel opens into the crankcase interior via a transfer window on a cylinder bore of the cylinder and via a passage opening. A second intake channel is provided for supplying scavenging air to the transfer channel. The first intake channel and the second intake channel are configured for supplying air. An injection valve configured for injecting the entire quantity of fuel to be supplied to the engine directly into the crankcase interior is disposed on the crankcase. A method for operating a two-stroke engine provides that the entire quantity of fuel to be supplied to the engine via a metering installation is supplied directly to the crankcase interior.

Two-stroke engine and method for operating a two-stroke engine

A work apparatus has a work tool driven by a combustion engine. A brake assembly has a brake element for braking the work tool as it slows down. In a braking position of the brake assembly, the work tool is braked, while, in a stand-by position of the brake assembly, the brake element enables the movement of the work tool. The brake element is held in the stand-by position by a holding force from an electromagnet supplied with energy by an electric generator driven by the engine, for which purpose, in the stand-by position of the brake assembly, a holding current is supplied to the electromagnet. To extend the holding time as the engine slows down, an operating parameter of the engine is monitored and, after a limit value of the operating parameter is reached, the holding current supplied to the electromagnet is reduced.

Work apparatus having an electromagnetic brake assembly

A method is for activating an electromagnetic valve including a valve seat and a valve body. The valve body is movable between a first and the second position (A, B) via an electric drive coil. The drive coil is connected to a control device which as a function of a setting variable (S) energizes the drive coil with a signal sequence consisting of control signals in order to move the valve body. The control device as a function of the setting variable (S) sets a predetermined signal amplitude and/or a predetermined signal duration of the control signals. It is provided that at least one control signal of the signal sequence is formed with an amplitude superelevated above the predetermined signal amplitude and/or with a signal duration extended beyond the predetermined signal duration.

Method for activating an electromagnetic valve

A handheld work apparatus has a tool and a brake assembly for the tool. The brake assembly has an actuating element which acts on a brake element of the brake assembly. The actuating element is movable between a fixed position wherein the tool is not braked, and a released position, wherein the brake element brakes the tool. To fix the actuating element in the fixed position, an electromagnet is provided. The electromagnet interacts with an anchor on the actuating element. The anchor is mounted via a pivot joint on an anchor pin to be pivotable about a pivot axis. A guide includes a guide part connected to the anchor and a guide part connected to the yoke, wherein, in the fixed position of the actuating element, the guide parts guide the anchor relative to the yoke in a transverse direction of an outrigger of the apparatus.

Handheld work apparatus having a work tool and a brake assembly for the work tool

A manually actuated feed pump is provided with a primer bulb to be manually actuated by an operator. The primer bulb has a pump chamber. A travel-controlled valve connects the pump chamber to a fuel line. The travel-controlled valve has a valve member that is moved by an actuation travel of the primer bulb into an open position that opens the travel-controlled valve. A first spring is operatively connected to the valve member and to the primer bulb. The primer bulb acts through the first spring on the valve member.

Manually actuatable feed pump and fuel system with a feed pump

A hand-guided power tool has a support arm and a tool member supported on the support arm. A drive motor is provided and a drive belt is rotatably driven by the drive motor and drives in turn the tool member. The support arm has a belt chamber in which the drive belt is arranged. The belt chamber is closed off relative to the environment and sealed off relative to the environment.

Growing community of inventors

Backnang, Germany

Tobias Deigendesch