Pumps – Motor driven – Fluid motor
Patent
1993-07-19
1995-05-30
Bertsch, Richard A.
Pumps
Motor driven
Fluid motor
417395, 123 73C, F04B 1700, F02B 3304
Patent
active
054196868
ABSTRACT:
The invention is directed to a fuel pump for an internal combustion engine such as a two-stroke engine in a portable handheld work apparatus such as a motor-driven chain saw or the like. A pump chamber is connected via a suction valve to a fuel feed and via a pressure valve to a pressure line. A pump membrane delimits the pump chamber and is driven by the fluctuating crankcase pressure of the engine which is present in the work chamber. Pump operation free of disturbances over a wide rpm range is attained with the suction valve to the pump chamber being configured essentially as a valve having the shape of a part circle, The pressure valve is disposed approximately at the center of the suction valve and delimits the pump chamber in the stroke direction of the pump membrane.
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Adam Roland
Geyer Werner
Nickel Hans
Schierling Roland
Wissmann Michael
Andreas Stihl
Bertsch Richard A.
McAndrews, Jr. Roland G.
Ottesen Walter
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