Siemens Aktiengesellschaft

G&uuml;nter Lewentz

Wilhelm Frank

Andreas Voigt

Wendelin Kl&uuml;gl

Hakan Yalcin

Gerd Schmutzler

Eberhard Kull

Andreas Fath

Carsten Schuh

Claus Zumstrull

Dirk Baranowski

Stefan Lehmann

Raimondo Giavi

Karl Kirchweger

Johannes Fitzner

Alwin Perras

Hinrich Kr&uuml;ger

J&uuml;rgen Rink

Olaf Enke

The injection valve has a housing, a nozzle body and a clamping nut connected to the housing that contacts the nozzle body with first contact surface ( ) acting on a second contact surface ( ), whereby the clamping nut clamps the nozzle body against the housing. The first or second contact surface has a curvature ( ) towards the second or first contact surface and the both contact surfaces are in contact in the area of the curvature.

Injection valve comprising an optimized surface geometry between a nozzle body and a retaining nut

The fuel injector has a housing that is formed from at least one nozzle tension nut, a first injector module and a second injector module. The first injector module and the second injector module adjoin one another and are disposed in the nozzle tension nut. A fuel high-pressure bore is led through the first injector module and the second injector module. A fuel return bore is disposed in the housing. Contact surfaces between the injector modules form a first gap that adjoins the high-pressure bore. Contact surfaces between the nozzle tension nut and the injector modules form a second gap that is connected to the first gap. The return line adjoins the second gap for the discharge of fuel that has entered the second gap from the high-pressure bore via the first gap. The fuel injector is such that the second gap is sealed off relative to the surroundings of the fuel injector.

Fuel injector

A method for producing a structural unit with a prestressed piezoelectric actuator includes the steps of inserting a front end of the actuator into a hollow body, form-lockingly or force-lockingly connecting the inserted front end of the actuator to the hollow body, pressing the actuator into the hollow body with a defined force establishing a prestress of the actuator, and force-lockingly or form-lockingly connecting the actuator to the hollow body in the vicinity of a rear end of the actuator, for fixing the prestress of the actuator.

Method for producing a piezoelectric structural unit

Located between the frustoconical needle tip and the cylindrical needle shank of a nozzle needle of a fuel injection valve is a frustoconical needle portion, into which is introduced a peripheral groove. Through this kind of arrangement damping is capable of being set, depending on the position of the groove, during the axial movement of the nozzle needle.

Fuel injection valve for a combustion engine

The nozzle body ( ) of a fuel injection valve has a central bore ( ) in which a nozzle needle ( ) is guided. The tip ( ) of the nozzle body ( ) has a tapered valve seat ( ) which forms together with the sealing edge ( ) of the nozzle needle ( ) a valve ( ) which controls the flow of fuel to the injection holes ( ) in the nozzle tip ( ). Underneath the sealing edge ( ) a circumferential groove ( ) is disposed in the truncatoconical needle tip ( ) at the level of which the injection holes ( ) are disposed, so that when the valve ( ) opens the nozzle needle ( ) is axially stabilized and the shaping of the injected jet is improved.

Fuel injection valve for an internal combustion engine

A servo drive includes a piezoelectric actuator contained in a drive housing. The actuator has an actuator stack surrounded by a hollow cylindrical spring element and an actuator casing disposed in the spring element. The spring element is clamped, together with the actuator stack, between an actuator cap and an actuator base. An elastic compound fills gaps between the drive housing and the spring element as well as between the spring element and the actuator casing, and damps an actuator motion. A piezoelectric actuator for the servo drive and a method of producing the piezoelectric actuator are also provided.

Piezoelectric actuator for a servo drive, servo drive with a piezoelectric actuator and method of producing a piezoelectric actuator

A device for transmitting a deflection of a piezoelectric actuator to a movable tappet includes a pressure chamber between the piezoelectric actuator and the tappet. The pressure chamber is substantially formed by two mutually parallel diaphragms having effective radii of different lengths. The diaphragm with the longer radius is associated with the piezoelectric actuator and the diaphragm with the shorter radius is associated with the tappet. Therefore, upon a deflection of the first diaphragm by the piezoelectric actuator, the second diaphragm is deflected by a greater distance toward the tappet. A controller with an actuator having a controllable length is also provided.

Growing community of inventors

Wuppertal, Germany

Günter Lewentz

Growing community of inventors

Wuppertal, Germany

G&uuml;nter Lewentz

Günter Lewentz