Robert Boschgmbh

Heinz Nothdurft

Karl Konrath

Gerald Hofer

Nestor Rodriguez-Amaya

Wolfgang Fehlmann

Andreas Dutt

Gunter Bofinger

Claus Koster

Ewald Eblen

Wolfgang Braun

Klaus Krieger

Hubert Greif

Walter Fuchs

Bernhard Bonse

Karl-Friedrich Russeler

Helmut Simon

Josef Hain

Andreas Sterr

Mohammad-Ali Khosrawi

Carlos Alvarez-Avila

Manfred Narr-Hess

Joerg Wolke

Hellmut Tomasch

Clemens Senghaas

Reinhard Trunk

Kurt Sprenger

Hubertus Zedler

Remy Schmitt

Holger Pitsch

Joachim Siegert

Robert Bacher

Wulf Emsmann

A fuel injection pump of the distributor type which has a reciprocatingly driven pump piston that is load-bearing in a rotating distributor shaft which pumps fuel out of a pump work chamber to various fuel injection valves via a distributor opening. To control the duration of high-pressure injection, an electrically actuated valve is provided with a valve member in a valve chamber that communicates with the pump work chamber and from a second valve chamber, communicates with a low-pressure region. To terminate the high-pressure injection, the valve member makes a communication between the two valve chambers, whereupon the outflow of the fuel stream is controlled by disposing a diameter constriction in the connecting line, thus reducing any tendency to cavitation.

Distributor-type fuel injection pump

Fuel injection pump for internal combustion engines

A fuel injection pump for internal combustion engines which has a moving part supported in a housing bore and on its jacket face on one side, has an exit opening that is under high pressure, and whose bearing is improved by virtue of the fact that on the jacket face of the part or in the wall of the housing bore, at least one pressure compensation is provided. The compensation face is connected to a high pressure source, is disposed on a side of the jacket face of the part which side is remote from the exit opening, and is continuously covered by the wall of the housing bore. As a result, a compensation of the pressure action by means of the pressure field prevailing in the region of the exit opening occurs so that an improved, less damage-prone bearing is produced with a greater high pressure tightness of the moving part.

Fuel injection pump

Magnet valve, in particular for fuel injection pumps

A fuel injection pump, for use with a supercharged internal combustion engine, is provided with a full-load stop that is adjustable by means of a stepper motor in dependence upon operating parameters such as engine speed and manifold pressure. An electrical control device for the stepper motor is housed in a casing which is flange-mounted on the fuel injection pump and cooled by fuel. Electrical transducers for engine speed and manifold pressure are also mounted on the fuel injection pump.

A fuel injection pump has a stepped piston operatively disposed in a stepped bore so as to define a first pump work chamber and a second pump work chamber. A constant fuel injection quantity (h.sub.FE) is pumped to the second work chamber per pump piston stroke, and a variable fuel injection quantity is pumped out of the first pump work chamber to a common distributor groove which actuates delivery of the fuel to individual injection lines.

Fuel injection pump for self-igniting internal combustion engines

A fuel injection pump for supplying fuel to the cylinders of the internal combustion engine comprises a housing, a cylindrical sleeve inserted in the housing and provided with a single filling opening communicated with a fuel-feeding passage, and a piston rotatably and reciprocally slidable in the cylindrical sleeve. An end face of the piston encloses with the closing element of the pump a pump operation chamber which is filled with fuel from the filling opening through a number of longitudinal grooves formed in the piston. The longitudinal grooves are in communication with a central relief opening by means of a plurality of radial connecting passages formed in the piston.

To provide a surface of wear-resistant material on the start lever of a lever assembly for a fuel injection pump control apparatus, a headed bolt of hardened, wear-resistant material is punch-pressed into a plate-like portion of the lever being engaged by a positioning element so that continuous movement of the positioning element with respect to the lever will not wear out the engagement surface and thus change a preset position of the positioning element with respect to the engagement surface of the lever, while permitting the lever to be made of a material suited for its purpose without regard to the particular surface characteristics of the engagement surface with the positioning element.

Fuel injection pump control lever construction

The device for testing the nozzles of injection pumps includes a temperature-responsive element arranged in the return-flow conduit of the injection pump and connected to the input of a control device the output of which controls two solenoid-operated 4/2 directional control valves which alternately open or close the feeding port to the intake conduit of the pump under test. The test liquid which is alternately delivered into the intake conduit by means of two delivery pumps from two containers storing the test liquid at different temperatures. When the temperature of the test liquid discharged by the overflow valve in the injection pump exceeds an upper limit (for example 55.degree. C.), the control valve through which the warmer test liquid is supplied is closed and the other valve delivers the cooler test liquid into the injection pump. Similarly, when the temperature of the overflow drops below the limit value, the delivery of the test liquid is switched over to take place from the warmer container. In this manner it is possible to keep the temperature of the test fluid in the injection pump constant and the reproducibility of the injection test is considerably improved.

Testing device for injection pumps

The pump piston in a fuel injection pump is provided with longitudinal grooves which provide communication between the pressure chamber and the fuel supply chamber. An annular groove on the pump piston connects the longitudinal grooves so that communication between the pressure chamber and the fuel supply chamber is interrupted only after onset of the axial pressure stroke regardless of prior piston rotation.

Fuel injection pump for an internal combustion engine

Growing community of inventors

Stuttgart, Germany

Heinz Nothdurft