Andreas Stihl Ag Co. Kg

Roland Schmidt

Werner Geyer

Manfred Rabis

Olaf Schmidt

Hans Nickel

Axel Klimmek

Antonio Fattorusso

Tommy Roitsch

Ulrich Kapinsky

Andreas Bähner

Patrick Schlauch

Florian V Krane

Heiko Stöcker

Silke Kaminski

Alfred Bothner

Ralf Blechsmidt

A starter device for an internal combustion engine () has an actuating device and an entrainer () can be coupled to the crankshaft () of the engine (). The entrainer () and the actuating device are rotatably journalled about a rotational axis (). The entrainer () and the actuating device are connected to each other via a damping spring (). The damping spring () is connected with a first end () to the actuating device and with a second end () to the entrainer (). The entrainer () and the actuating device have respective supports (). The damping spring () is mounted on the outer periphery of the two supports (). In the direction of the rotational axis (), a disc () is mounted between the two supports () in order to avoid the situation that the damping spring () can force itself into a gap between the two supports () which gap can arise during operation.

Starter apparatus for an internal combustion engine

A two-stroke engine has a cylinder and a piston reciprocating in the cylinder and delimiting a combustion chamber. The piston has at least one piston recess. A crankshaft is rotatably arranged in a crankcase connected to the cylinder. A connecting rod connects piston and crankshaft. Transfer channels connect the crankcase to the combustion chamber in pre-defined piston positions. The transfer channels each have a transfer port opening into the combustion chamber. A device for supplying fuel and an air channel supplying combustion air are provided. In predetermined piston positions, the air channel is connected by the piston recess to the transfer ports. The air channel opens into the cylinder bore opposite the exhaust for the exhaust gases. The air channel, the piston recess, and the transfer channels define an air passage that provides approximately uniform distribution of air from the air channel into the transfer channels.

Two-stroke engine

A portable handheld work apparatus such as a motor-driven chain saw () includes a housing () wherein an internal combustion engine () and a carburetor () are mounted. A throttle lever () is provided which is pivotally journalled on a handle (). The handle () is connected to the housing () via at least one antivibration element (). A vibration gap () is configured between the handle () and the housing (). A transmitting unit () is provided for transmitting the pivot movement of the throttle lever () to the carburetor (). The transmitting unit includes a rigid transmitting element () which bridges the vibration gap (). A simple configuration and a substantial decoupling of the relative movement between the housing () and the handle () from the actuating movement of the carburetor is achieved in that the transmitting element () is rotatably journalled and the pivot movement of the throttle lever () is transmitted as a rotation about a rotational axis () lying transverse to the vibration gap ().

Portable handheld work apparatus

The invention is directed to a crankshaft () of an internal combustion engine including an internal combustion engine for a portable handheld work apparatus such as a motor-driven chain saw or the like. The invention is also directed to a method for making the crankshaft () as well as an internal combustion engine with a corresponding crankshaft (). The crankshaft () is made up of separately manufactured parts and includes a crank arm () having a central cutout () for accommodating a shaft lug () of the crankshaft () and an eccentric cutout () for accommodating a crank pin (). The crank pin () journals a connecting rod (). A centrifugal mass portion () is provided on the crank arm () at its end lying opposite the eccentric cutout (). The centrifugal mass portion () is configured as one piece with the crank arm () and is bent out of a plane () of the crank arm () in the direction of the connecting rod ().

Crankshaft assembly of an internal combustion engine

Growing community of inventors

Korb, Germany

Roland Schmidt