Fuel-injection arrangement for an internal combustion engine

US5353754A · kind A · utility

Assignee

• Andreas Stihl AG & Co. KG · DE

Inventors

• Michael Wissmann · Markgröningen, DE
• Hans Nickel · Cottenweiler, DE
• Roland Schierling · Marbach am Neckar, DE
• Roland Adam · Besigheim, DE
• Manfred Thaiss · Winnenden, DE
• Werner Geyer · Newton, US

Key dates

• Filing date: Jul 19, 1993
• Grant date: Oct 11, 1994
• Expiry date: Jul 19, 2013

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S123/05
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

The invention is directed to a fuel-injection arrangement for a two-stroke engine in a motor-driven chain saw. An injection pump is mounted in a base housing with the injection pump including a pump piston axially displaceable in a pump cylinder. The pump piston delimits a pump chamber. The pump chamber is connected via a suction valve to a fuel tank. The fuel drawn by suction is pumped by the pump piston via a pressure valve, an injection line and an injection valve to the engine. For driving the pump piston, the latter is connected at one end to a membrane via a membrane plate. The membrane delimits a work chamber charged with fluctuating crankcase pressure. A simple assembly is provided by arranging the pump chamber, the suction valve and the pressure valve in a common valve housing which, in turn, is seated in the base housing of the injection pump in a seal-tight manner. The injection line is connected directly to the valve housing. This permits a preassembly of the valve housing with the valves provided therein which facilitates the manufacture of the fuel-injection arrangement.