Fuel injection pump for a two-stroke engine

Details Fuel injection pump for a two-stroke engine Fuel injection pump for a two-stroke engine

1992-09-04

1993-03-30

Okonsky, David A.

Internal-combustion engines

Two-cycle

Rear compression

12317914, 123504, 417214, F04B 4306

Patent

active

051974185

ABSTRACT:
The invention is directed to a fuel injection pump for a two-stroke engine which is especially for portable handheld tools such as motor-driven chain saws or the like. A pneumatic drive chamber is provided in the pump housing which is partitioned by a membrane into a pulse chamber charged by the crankcase pressure and a return chamber. A membrane plate holds the membrane and charges a pump piston which plunges into a pump cylinder for injecting fuel when a pulse is present in the pulse chamber. The pump piston draws fuel in by suction during a return stroke of the membrane plate into a start position determined by a stop. The stop is configured so as to be displaceable in the direction of the stroke of the piston in dependence upon temperature in order to obtain an adaptation of the injected quantity of fuel to the operating temperature of the engine. In this way, the stroke of the pump piston can be varied and therefore also the quantity of fuel supplied by the pump.

REFERENCES:
patent: 2935057 (1960-05-01), Perlewitz
patent: 3653784 (1972-04-01), Leitermann et al.
patent: 4473340 (1984-09-01), Walsworth
patent: 4700668 (1987-10-01), Schierling et al.
patent: 4807573 (1989-02-01), Schierling et al.
patent: 4846119 (1989-07-01), Geyer et al.
patent: 4932370 (1990-06-01), Schlerling et al.

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