Patent · US Expired

Fuel-injection pump arrangement for a two-stroke engine of a handheld portable tool

US4976246A · kind A · utility

12Cited by

11References

9Claims

0Family size

Assignee

Andreas Stihl AG & Co. KG · DE

Inventors

Roland Schierling · Marbach am Neckar, DE
Michael Wissmann · Markgröningen, DE
Hans Nickel · Cottenweiler, DE
Werner Geyer · Newton, US

Key dates

Filing date	Oct 21, 1988
Grant date	Dec 11, 1990
Priority date	—
Expiry date	Oct 21, 2008

Classification

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

Abstract

The invention relates to a handheld portable tool driven by a two-stroke engine equipped with a pneumatically actuated injection pump. Injection pumps for two-stroke engines are generally rigidly connected to the engine so that the injection line can be rigid and as short as possible. This, however, leads to operational disturbances in the injection pump. To eliminate these disturbances, the injection pump is mounted in a thermally insulated handle housing portion of the tool which is damped with respect to the vibrations of the engine and is connected to the latter via flexible connecting lines.

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