Patent · US Expired

Lubrication mechanism for a cam drive

US6736240B2 · kind B2 · utility

1Cited by

28References

18Claims

0Family size

Assignee

Andreas Stihl AG & Co. KG · DE

Inventors

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

Key dates

Filing date	Aug 31, 2001
Grant date	May 18, 2004
Priority date	—
Expiry date	Nov 16, 2021

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF01M3/00
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

A cam drive is provided for a valve control of a mixture-lubricated internal combustion engine that has a cylinder, and a cylinder head in which is disposed a poppet valve which is actuated by a pivotable rocker arm. Mounted in a cam chamber is a control cam that is driven by the crankshaft of the engine and on the cam path of which rests a drag lever that transfers the cam lift to the rocker arm. To achieve a reliable mixture lubrication, a flow guidance element is disposed in the annular chamber between the peripheral wall of the cam chamber and the maximum diameter of the path of a cam nose. The flow guidance element is provided with a flow edge that is disposed adjacent to the drag lever in the vicinity of the path diameter of the cam nose.

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