Robert Boschgmbh

Paul Fussner

Karl Hofmann

Hans-Jorg Vogtmann

Max Straubel

Dietrich Trachte

Kurt Seifert

Iwan Komaroff

Wilhelm Vogel

Heinrich Knapp

Gerhard Stumpp

Gerald Hofer

Karl Konrath

Ewald Eblen

Werner Faupel

Manfred Schwarz

Thomas Wilfert

Katsuoki Itoh

Werner Wagner

Alfred Grassle

Gunter Kapolke

Klaus Wolf

Edgar Schneider

Horst Salmanzig

Fuel injection nozzle for internal combustion engines

A fuel injection nozzle for internal combustion engines having a valve needle which enters an intermediate position in a retarded fashion and subsequently reaches its final position quickly. The valve needle is coupled in a positively-engaged manner with a supplementary body which as a result of its mass and/or hydraulically damps the movement of the valve needle over the course of a first stroke portion. At the end of this stroke portion, the supplementary body strikes a shoulder attached to the housing, whereupon the valve needle after the attainment of a notably higher fuel pressure, is separated from the supplementary body and translated quickly into its open position. In special cases, it is also possible for two supplementary bodies to be provided, which are uncoupled one after another from the valve needle and then again recoupled to the valve upon the closure of the valve. With an apparatus of this kind, the injection procedure can be adapted more freely than in the case of the known injection nozzles to a desired course.

A fuel injection nozzle for internal combustion engines is proposed which has a stepped piston which converts a medium pressure in the fuel inflow line into high pressure in accordance with the ratio between its piston surface areas. The stepped piston and the high-pressure chamber are disposed to surround the valve needle in accordance with the invention, resulting in a space-saving embodiment. The closing spring of the valve needle can be advantageously accommodated in the high-pressure chamber and can simultaneously act as the return spring for the stepped piston so that a separate part for that purpose can be dispensed with.

A fuel injection pump in which the beginning of fuel injection can be adjusted to begin earlier than normal, particularly during warm-up by means of an adjusting piston. The adjustment takes place by changing the tension of the return spring which cooperates with the fuel injection adjustment piston.

Fuel injection pump

To provide for coupling the injection needle of a Diesel injection valve with an inertia mass, and thereby provide for speed damping of the movement of the valve, the pressurized Diesel fuel is applied to a chamber (20,68) in the valve body (10,12,14), which slidably retains the needle valve element (18) at a location downstream of the inertia mass, the inertia mass subdividing the chamber into a spring or pressure chamber (20) and a damping chamber (68) forming a dead, or storage chamber for fuel, the inertia mass being slidable in the second chamber and the clearance between the inertia mass and the walls of the chamber forming a throttled connection duct so that, upon command to opening movement, the needle valve element will engage, after a short dead distance (v), the inertia mass (62) which must move against the flow resistance through the throttled connection upon shifting of fuel between the first and second chamber and thus damping the speed of operation of the valve element. The pressure differential at the two sides of the inertia mass will act on the entire cross-sectional area of the inertia mass, to provide high initial damping of the valve needle movement upon initiation of an opening stroke, while permitting a slim construction minimizing external diameter.

Fuel injection valve for an internal combustion engine

To provide for effective sealing of the solenoid coil structure with respect to fluid, the flow of which is to be controlled, a sleeve with a closed bottom, preferably integral with the sleeve, is inserted in the coil, and is in gap-free engagement with a core portion extending into the opening of the solenoid coil, a plunger-type armature being movable within the sleeve. The outer portion of the sleeve is sealed to the housing, for example by a solder connection, so that the interior of the solenoid is separated in liquid-tight relationship from the interior of the sleeve to prevent contamination of the space containing the winding by fluid being controlled by the valve. The housing, at the outside, may be formed with a groove in which a sealing ring is located to seal the housing to a pump assembly with which the valve is to be used.

Fluid-sealed, electromagnetic valve operating structure, particularly

A fuel injection apparatus for mixture-compressing, externally ignited internal combustion engines. An air flow rate member, arranged in the air intake manifold is moved against a return force by air flowing through it to adjust a control slide of a metering and distribution assembly arranged in the fuel supply line in order to effect the apportionment of a quantity of fuel which is proportional to the air quantity. The return force is produced by a pressure fluid acting upon the control slide, the pressure of the fluid being variable in accordance with operating characteristics of the internal combustion engine. The control slide has an actuation slide contacting the air flow rate member as well as an apportionment slide, which has a projection with a smaller diameter projecting into an axial throttle bore of the actuation slide and defining a damping space in the throttle bore. The damping space is in communication with the fuel supply line via a gap between the projection and the throttle bore, and there is a bimetallic spring arranged between the apportionment slide and the actuation slide. By this means a richer fuel-air mixture is controlled at the metering and distribution assembly in accordance with the starting temperature, during starting of the engine below a predetermined temperature; the enrichment is lessened after the start in accordance with both temperature and time.

Fuel injection apparatus

A fuel pump assembly wherein an elongated tubular housing surrounds a fuel pump and an electric motor and has a fuel-admitting inlet at one end and a fuel-discharging outlet at the other end. The rotor of the electric motor drives the pump rotor through the medium of several axially parallel elastic pins which extend into complementary sockets of the pump rotor. The pump rotor rotates directly on a shaft which is fixedly mounted in the housing. The rotor of the electric motor rotates on several friction bearings consisting of sinter metal and surrounding the fixedly mounted shaft. The pins form part of an elastomeric casing which surrounds a portion of or the entire rotor of the electric motor. Some fuel flows from the pressure side of the pump into an annular space between the shaft and the pump rotor and thence toward the outlet by flowing through the bearings as well as through a sleeve which supports the rotor of the electric motor and rotates with the bearings.

Fuel pump assembly

Growing community of inventors

Sindelfingen, Germany

Paul Fussner