Robert Boschgmbh

Andre Brunel

Karl Konrath

Claus Koester

Pierre Lauvin

Christin Taudt

Francois Quarret

An electrically controlled fuel injector unit for fuel injection in internal combustion engines, in which an injection pump, an injection nozzle, and between them a control valve and control magnet are fastened in a fuel injector unit housing. The control valve and the control magnet, including requisite conduits, are combined in a magnet valve housing to form a structural unit that is inserted as a whole into the fuel injector unit housing. The control valve and control magnet are disposed eccentrically in the magnet valve housing, and a high-pressure conduit that connects the pump work chamber to the injection nozzle extends on a side of the magnet valve housing having a greater accumulation of material resulting from the eccentricity.

Electrically controlled fuel injector unit

A fuel injection pump for internal combustion engines has an adjusting piston for adjusting an injection instant, is acted upon by a return force and delimits a working space, a control slide delimiting a pressure space in the adjusting piston and displaceable in the adjusting piston counter to a return force by a pressure-source supply pressure in the pressure space and controlled as a function of speed of the engine so that the working space can be connected to a pressure source or to a relief space, and so the supply pressure in the pressure space is additionally controlled as a function of further operating parameters of the engine. A feed pump delivering at a rate proportional to speed has a delivery side connected to the pressure space, a pressure line, containing a restriction, directly connects the delivery side of the feed pump to the pressure space so that the pressure is directly connected with the feed pump exclusively by the pressure line and is not connected with the inlet chamber. A discharge line is arranged for relieving the pressure space downstream of the restriction and having an element arranged in the discharge line for controlling the control pressure and influencing a flow a fuel from a delivery line, a pressure maintaining valve is arranged in the delivery line and enable passage to the inlet chamber only at a certain pressure at the delivery line, and a pressure control valve relieves the inlet chamber.

Fuel injection pump for internal combustion engines

The invention relates to a fuel injection device for internal combustion engines and to a method for fuel injection. The invention is directed to an injection nozzle system that while having high intrinsic safety of an injection pump, in the case of electrically controlled pumps, assures fast element filling and simultaneously effective cooling of the injection nozzle as well. According to the invention, an additional final control element is provided between the pump work chamber and the pressure chamber of the injection nozzle and dependent upon the pressure in the pump work chamber the position of the final control element controls a direct fuel delivery path into the pump work chamber.

Fuel injection device for internal combustion engines

A distributor fuel injection pump for internal combustion engines, having a cam ring which drives at least one radial piston and having a distributor piston disposed transversely to the cam ring and defining a pump work chamber, having a distributor groove and longitudinal intake grooves in the jacket face. For shutoff of the engine, this distributor piston is axially displaceable and thereby undergoes a relative rotation relative to the cam ring, so that the longitudinal intake grooves upon the compression stroke of the pump piston come precisely to coincide with intake conduits and by this means the pumped fuel is pumped directly back into a suction chamber of the injection pump.

Distributor fuel injection pump for internal combustion engines

Fuel injection pump

A fuel injection pump formed as a radial piston pump having an encompassing cam ring, which drives pump pistons and a feed piston, which feed piston is embodied as a feed pump and is urged by a spring in the direction of the cam race. This arrangement results in a small size for the pump, in which sealing problems are substantially reduced and only a small idle fuel volume must be moved. By means of this fuel injection pump, a relatively high fill pressure in a pump work chamber is attained.

In a fuel injection pump for internal combustion engines having at least one pump piston defining a pump work chamber and set into reciprocating motion by a cam drive for executing an intake stroke and a supply stroke, and having an electrical switching valve controlling the duration of supply and disposed in a relief line leading from the pump work chamber to a pump interior, a non-return valve having an opening direction toward the pump work chamber is disposed in a fuel inflow line connecting the pump interior with the pump work chamber in order to attain an emergency stoppage of the engine in the event the switching valve malfunctions. The valve element of the non-return valve is acted upon on one side by a valve closing spring and on the other by a fuel-filled control chamber, with which the valve element is locked in its closing position during the closed position of the switching valve.

Growing community of inventors

St. Genis Laval, France

Andre Brunel