Patent · US Active

Two-stroke engine

US11952937B2 · kind B2 · utility

0Cited by

4References

22Claims

0Family size

Assignee

Andreas Stihl AG & Co. KG · DE

Inventors

Michael Grether · Waiblingen, DE
Robert Koehli · Winnenden, DE
Richard Wirt · Waiblingen, DE
Bernd Engel · Stuttgart, DE

Key dates

Filing date	Jun 13, 2023
Grant date	Apr 9, 2024
Priority date	—
Expiry date	Jun 13, 2043

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF02B2075/025
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

A two-stroke engine possesses a cylinder, in the cylinder bore of which a combustion chamber is formed. The combustion chamber is bounded by a reciprocating piston, which drives a crankshaft rotatably mounted in a crankcase. A crankcase interior is fluidically connected to the combustion chamber across at least one transfer channel in at least one position of the piston. The at least one transfer channel emerges with a discharge opening in the crankcase interior and with at least one transfer window on the cylinder bore. It is proposed that all transfer channels have an average length as measured from the discharge opening to the transfer window, the average length being at least 1.5 in relation to the stroke, and that the volume of the crankcase interior including all transfer channels is at most 3.1 in relation to the piston displacement.

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