Andreas Stihl Ag & Co.

Andreas Stihl Ag Co. Kg

Georg Becker

Maximilian Eberhardt

Hans-Georg Wiedmann

Dieter Angstenberger

Norbert Veser

Sven Keller

J&uuml;rgen H&auml;berlein

Jürgen Háberlein

Markus Husges

Thomas Elsner

J{umlaut Over (u)}rgen H{umlaut Over (a)}berlein

A portable handheld edge cutter () has a cutterhead () fixed to a guide tube (). Two wheels () are attached to the cutterhead (). The cutterhead () includes a gear unit mounted in a gear housing (). A first wheel () is rotatably journalled on a first end () of the gear housing (). On the opposite-lying end () of the gear housing (), a cutting knife () is mounted and is rotatably driven by the output shaft () of the gear unit. In order to achieve a simple assembly of the edge cutter () and to protect the gear housing () against wear, the second wheel () is mounted between the gear housing () and the cutting knife () and that the two wheels () are journalled coaxially to the output shaft ().

Edge cutter

The invention relates to an operating medium tank () for a drive unit (), especially for an internal combustion engine () of a portable handheld work apparatus. The tank () has a fill opening () and a output opening () in the housing wall () of the tank. According to the invention, at least one base () having a lug () is formed as one piece from the housing wall () in order to configure the tank so as to be operationally safe and easy to assemble. The tank () can be fixed with the aid of the lug () so as to be form-tight and separable on a receptacle () of the drive unit ().

Tank for holding an operating medium

The invention is directed to a mixture lubricated four-stroke engine having a cylinder and a piston which delimits a combustion chamber in the cylinder. The piston drives a crankshaft via a connecting rod with the crankshaft being journalled in a crankcase. An inlet valve and an outlet valve are provided for the combustion chamber and have respective valve members which are actuated via a valve drive assembly driven by the crankshaft. The inlet valve is connected via an intake channel to a mixture-preparation device. The valve housing is, on the one hand, connected to the crankcase and, on the other hand, is flow connected via a connecting channel to the intake channel. The crankcase is connected to the mixture-preparation device exclusively via the valve housing, the connecting channel and the intake channel. In this way, an adequate lubrication and excellent acceleration performance is ensured with a constructively simple configuration and excellent exhaust-gas quality.

Four-stroke engine

The invention relates to a motor-driven chain saw having an internal combustion engine for driving the saw chain of the chain saw. The engine is mounted in the housing of the chain saw and includes a cylinder and a combustion chamber formed in the cylinder. The combustion chamber is delimited by a piston and the piston drives a crankshaft via a connecting rod. The crankshaft is rotatably journalled in a crankcase. An inlet and an outlet are provided for gas exchange in the combustion chamber and the inlet is connected via an intake channel to a mixture preparation device. A stroke/bore ratio of less than 0.8 is used in order to provide an engine of reduced structural elevation which is useable in all positions. The inlet and outlet are controlled via valves having a valve drive charged with the air/fuel lubricating oil mixture supplied via the mixture preparation device.

Portable handheld work apparatus having a four-stroke engine

The invention is directed to an internal combustion engine for a portable handheld work apparatus. The engine includes a cylinder having a combustion chamber and a piston rotates a crankshaft via a connecting rod. The crankshaft is mounted in a crankcase and is connected to a cam drive. The cam drive drives a valve control for an inlet valve and an outlet valve. The inlet valve controls an overflow channel which leads from the crankcase to the combustion chamber, and the outlet valve controls an outlet channel branching away from the combustion chamber. Furthermore, an intake channel, which opens into the crankcase, and a housing, which is separate from the crankcase, are provided for the cam drive. In order to provide a lubrication for the cam drive which is independent of position, the cam drive is configured as a gear wheel drive and an oil sump is provided in the housing of the cam drive. At least one gear wheel of the cam drive is so arranged that it dips at least partially into the oil sump and pumps oil for lubricating the movable parts of the engine.

Internal combustion engine for a portable handheld work apparatus

A hand-held vacuum/blower device has a housing with an interior and a drive motor arranged in the interior. The drive motor has a drive shaft. A blower spiral is connected to the housing. The blower spiral has a first and a second radial end faces and each one of the radial end faces has at least one air inlet opening. A blower wheel is arranged in the blower spiral and coupled to the drive shaft. A venting wheel is coupled to the drive shaft for conveying cooling air from the exterior of the housing to the drive motor in the interior of the housing. The blower wheel has a hub and a wall connected to the hub and extending to the periphery of the blower wheel. The wall has a first end face facing the first radial end face and a second end face facing the second radial end face. The blower wheel includes first and second vanes wherein the first vanes are connected to the first end face of the wall and the second vanes are connected to the second end face of the wall. The first radial end face is part of the housing and the air inlet opening of the first radial end face connects the interior of the housing to the suction area of the blower wheel.

Motor cooling means for a vacuum/blower device

An internal combustion engine has a reciprocating piston moving in a cylinder. A crank shaft is mounted in the interior of the crankcase. A connecting rod connects the piston to the crankshaft. The crankcase has a venting device for pressure compensation of the interior of the crankcase. The venting device has a venting line having a channel extending in a rotary component of the engine.

Internal combustion engine

The invention relates to a reciprocating piston engine having a piston which moves upwardly and downwardly and which rotatably drives a crankshaft and components connected therewith via a connecting rod. The crankshaft is journalled in the crankcase which has a crankcase venting system to compensate pressure in the interior space of the crankcase. The venting system includes a venting line leading away from the interior space of the crankcase. The venting line is configured as a channel in a rotating component in order to achieve a functionally reliable pressure compensation with high separating action. The channel defines a connection between the interior space of the crankcase and the atmosphere. A valve is mounted in this channel and this valve becomes unblocked under the action of centrifugal force and seals the crankcase with respect to fluids when the engine is at standstill.

Reciprocating piston engine

A hand-guided working tool has a housing and an internal combustion engine arranged in the housing. The internal combustion engine has a cylinder, a crankshaft, and a crankcase enclosing the crankshaft. An air filter box including an air filter element is connected to the internal combustion engine. A tool is driven by the crankshaft. The housing has a blower chamber with a cooling air inlet, at least one combustion air inlet, and a combustion air outlet. A combustion air channel connects the combustion air outlet to the air filter box. A blower, driven by the crank shaft and arranged in the blower chamber, is provided for taking in cooling air through the cooling air inlet and supplying the cooling air to the internal combustion engine and for taking in combustion air through the at least one combustion air inlet and guiding the combustion air through the combustion air outlet, the combustion air channel, and the air filter box to the internal combustion engine. The blower includes a first blower wheel for conveying cooling air and a second blower wheel for conveying combustion air.

Hand-guided working tool such as a trimmer, motor chainsaw, or cutter

The invention is directed to a centrifugal clutch having centrifugal weights wherein each weight has an arc-shaped clutch shoe and is pivotally mounted with a lever foot on a carrier disc on the drive end of the clutch. After reaching a specific rpm, the clutch shoes are pressed under the action of centrifugal force against the inner wall surface of a clutch drum for providing friction-tight torque transmission. The clutch drum surrounds the clutch shoes. The centrifugal clutch includes a carrier disc on which the centrifugal weights are pivotally mounted. A cover disc is held axially tight at the sides of the centrifugal weights which lie opposite the carrier disc. This cover disc radially covers the clutch shoes so that axial guide play is provided. In this way, wear of the clutch weights caused by operation is reduced especially in the bearing regions of the centrifugal weights.

Growing community of inventors

Schwaikheim, Germany

Georg Becker