Patent · US Expired

Valve drive mechanism for an internal combustion engine

US6546905B2 · kind B2 · utility

1Cited by

1References

13Claims

0Family size

Assignee

Andreas Stihl AG & Co. KG · DE

Inventors

Bernhard Durr · Stuttgart, DE
Harald Schliemann · Waiblingen, DE
Manfred Rabis · Schorndorf, DE

Key dates

Filing date	Aug 31, 2001
Grant date	Apr 15, 2003
Priority date	—
Expiry date	Aug 31, 2021

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF02B2075/027
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

A valve drive mechanism is provided for an internal combustion engine, especially a four-stroke engine in a power chain saw. The implement housing is spanned by a front handle, the tubular grip of which is adjacent to the cylinder head of the engine and extends from one longitudinal side of the implement to the other longitudinal side thereof. A rocker arm of a valve control is pivotably mounted on the cylinder head between the ends of the rocker arm, with the rocker arm being pivotable about a pivot axis disposed transverse to the rocker arm. Push rods of a control mechanism engage one end of the rocker arm to actuate a poppet valve, on the valve stem of which the other end of the rocker arm acts. To be able to guide the tubular grip close to the center of gravity of the implement, the longitudinal axis of the rocker arm is disposed approximately parallel to the adjacent portion of the tubular grip.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.