Robert Boschgmbh

Odon Kopse

Ewald Eblen

Karl Hofmann

Nestor R Amaya

Gerhard Stumpp

Franz Eheim

Gregor Schuster

Josef Schlagenhauf

Gerald Hofer

Nestor Rodriguez-Amaya

Johannes Locher

Rainer Buck

Heinz Kuschmierz

Gunter Kulke

Richard Kinzel

Willi Voit

Heinz Links

Kurt Ziesche

A fuel injection nozzle for internal combustion engines, in particular a cold-starting valve which has a valve needle opening counter to the force of a closing spring, the valve needle being additionally urged in the closing direction by an adjusting piston. The adjusting piston rests on a yielding stop formed by the closing spring. The stop is formed by the upper valve plate, which has a passageway bore for an extension tang of the adjusting piston. The extension tang forms a pre-stroke stop for the valve needle. A restoring spring is associated with the adjusting piston and is disposed inside the spring chamber, which surrounds the extension tang of the adjusting piston. At least one of the spring support plates has an inner annular wall protruding in collar-like fashion, which surrounds the engaged tang of the adjusting piston or valve needle.

Fuel injection nozzle

The invention relates to a fuel injection nozzle in which a control piston acts on the valve needle, which control piston can also be acted upon by another fluid with an arbitrarily changeable pressure. In this manner it is relatively simple to meet the ever increasing requirements to apply an influence of engine characteristic values to the fuel injection process.

To positively retain a signal transducer coil within an insert ring, axially stacked on a fuel injection nozzle assembly, in which the induction coil provides an output signal upon axial reciprocating movement of the valve needle element of the injection valve, the opening is made large enough to receive a holding sleeve with an inwardly extending flange, the holding sleeve fitting over the induction coil and pressing the coil against the bottom wall of the opening. The holding sleeve, itself, preferably made of magnetic metal, is adhesively secured in the opening which, preferably, has a non-cylindrical shape, either extending conically or formed with a ring groove of, preferably, sawtooth cross section.

Electrical signal generating fuel injection valve

A fuel injection nozzle is proposed, intended in particular for Diesel engines, in which an induction coil is installed in an intermediate disc. The coil core is embodied by a pressure element and a valve needle in force-locking contact therewith. An annular permanent magnet is secured either on the pressure bolt or on the intermediate plate. This embodiment of an injection nozzle, as a so-called needle stroke transducer, is used when it is desired to ascertain the duration of injection and especially the onset of injection.

Fuel injection nozzle for internal combustion engines

A fuel injection nozzle is proposed having two nozzle needles in which the control of the fuel delivered via an inflow line is effected by means of a slide valve embodied as a 3-way valve, which in a preferred embodiment of the invention is simultaneously embodied as a 3-position valve and permits not only the alternative exertion of the fuel pressure upon one of the nozzle needles but also a common pressure exertion of both nozzle needles.

A fuel injection nozzle for internal combustion engines, in which the valve needle together with the valve seat of the nozzle body forms an electric switch which by its opening and closing indicates the injection onset and the injection duration. A spring-elastic conductive element is disposed inside the closing spring and connects the attachment piece with the valve needle.

A fuel injection nozzle having a needle valve in which the injection ports are formed within the valve needle instead of within the nozzle body and a control opening located in the nozzle body for controlling the injection ports; the control opening being large enough to avoid clogging and capable of controlling one or more injection ports during the needle valve stroke.

An electro-mechanical switch, which is part of an electrical current circuit, is disposed in a fuel injection nozzle for internal combustion engines. The first switch contact is secured via an insulating body of a pressure bolt of the nozzle needle; the second switch contact is held pressed against the first switch contact by a contact spring supported on the pressure bolt, so that the portion of the electrical current circuit comprising the nozzle is closed. At the beginning of the opening stroke of the nozzle needle, the second switch contact, because of its inertia of mass, briefly fails to follow the first contact so that the electrical current circuit is interrupted; it is closed by the followup of the first switch contact caused by the contact spring. The switch can be inserted inside a normal injection nozzle without great expense.

Fuel injection nozzle with movement switch

To provide for gradual admission of servo fluid to then operate a fuel injection pump to pus injected fuel out through the nozzle, a control valve element is used which has a displacement or deflection-vs.-servo fluid admission characteristic which provides for hydraulic choking of pressurized servo fluid being admitted to a servo cylinder chamber upon initiation of a fuel injection event, and thereby provide for gradual build-up of injection pressure of the fuel. By suitable shaping of the choke ducts, the admission of fuel can be first of a small quantity, then interrupted, and then of a selected, for example full servo fluid quantity; this can be accomplished by forming an intermediate land on a control slider or rotary valve element with a connecting passage forming a choke; or gradually decreasing choking effect of fluid admission, for example by forming relatively movable control surfaces at an inclination so that, upon initial opening of a fluid path, the inclined surface will provide for a constricted passage-way which then gradually opens to full admission of pressurized servo fluid.

Servo operated injection nozzle-pump combination with controlled rate of

A pump/nozzle for internal combustion engines is proposed wherein the hydraulically driven pump piston is braked in its motion after the pressure line leading to the injection valve is closed. The braking is effected after delivery is ended by means of the fuel which is forced out of an end section of the pump work chamber which serves as a filling chamber. Braking or damping occurs with a delay by means of a throttle apparatus, and in a further embodiment, braking occurs simultaneously with the relief, to a lower standing pressure level of the pressure line.

Pump/nozzle for internal combustion engines

The invention relates to a fuel injection nozzle for internal combustion engines provided with a nozzle body and having an axially guided radially sealed valve needle as well as an adjusting piston for cooperation with said valve needle.

The invention concerns a fuel injection nozzle with a valve needle and a hollow needle, both of which are loaded by only one spring. During opening one of the needles strikes a stop while the other needle continues to move against the force of the spring.

Improvements in a fuel injection nozzle for internal combustion engines having a needle valve positioned in a chamber constrained by a closure spring positioned in another chamber thereabove, there also being provided an intermediate piston which includes a portion that extends into the spring chamber therebeneath and further includes a working surface area that is subjected to pressures in still another chamber positioned thereabove.

A high pressure fuel injection system includes a pump-type fuel injection nozzle assembly provided with a sliding control valve which admits pressurized fuel or opens a return channel. A pressure chamber situated near the end of the needle valve of the nozzle remote from its seat is connected via a bypass channel with a region downstream of the sliding valve for the purpose of exerting a hydraulic closing force on the needle valve. The pressure in the bypass channel is controlled by the motions of the sliding valve. Alternatively, the additional hydraulic pressure may be exerted on the needle by an intermediate piston.

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Stuttgart, Germany

Odon Kopse