Distributor for continuously operating fuel injection systems

Claim 1

In a continuously operating fuel injection system for multicylinder internal combustion engines, including a distributor of known type that has (A) arbitrarily and simultaneously operable metering valve means to determine the fuel quantities to be admitted to fuel injection means forming part of said system, (B) at least one first and adjoining second chamber receiving, respectively, fuel under pressure from upstream of and downstream of said metering valve means and (C) control valve means serving to maintain constant the pressure drop of fuel through said metering valve means, the improvement comprising, A. conduit means associated with each second chamber and connecting the latter with a fuel injection means, B. a flat valve seat disposed in the upstream end of said conduit means and forming the stationary part of said control valve means, C. a membrane separating each first chamber from an adjoining second chamber and forming the movable part of said control valve means, said membrane cooperating directly with said flat valve seat, said fuel pressure upstream of saId metering valve means and prevailing in said first chamber, adapted to urge said membrane towards said flat valve seat to decrease the flow passage section of said conduit means, said fuel pressure downstream of said metering valve means and prevailing in said second chamber, adapted to urge said membrane away from said valve seat to increase the flow passage section of said conduit means, D. means defining a bore forming part of said metering valve, E. means for introducing fuel under pressure into said bore, F. means defining a plurality of axial, parallel metering slots at least equaling the number of said second chambers, each metering slot communicating with said bore and with one of said second chambers and G. a metering plunger forming part of said metering valve and slidably disposed in said bore, said metering plunger having a metering land uncovering to a greater or lesser extent said metering slots depending upon the axial position of said metering plunger in said bore, the change in the area of the uncovered portion of each metering slot being linearly proportionate to the axial displacement of said metering plunger.