Siemens Aktiengesellschaft

Continental Automotive Gmbh

Other

Micronas Gmbh

Noliac A/s

Tim Schwebel

Andreas Kappel

Bernhard Gottlieb

Carsten Wallenhauer

Bernhard Fischer

Georg Bachmaier

Robert Wolfgang Kissel

Heinrich-Jochen Blume

Karl-Heinz Mittenbühler

Hans Meixner

Christian Tump

Elfriede Simon

Maximillian Fleischer

Joachim Heinzl

Helmar Liess

Walter Buxmeyer

A microstepper motor which comprises two electromechanical drive elements, especially piezoelectric bending actuators, having effective directions that are perpendicular to each other. These actuators act upon a drive ring to thereby rotate a shaft. The actuators are non-radially hinged to the drive ring via an approximately square shear-flexible and torsion-proof frame structure, the drive ring being arranged inside said frame. The drive according to the invention is compact, the frame and the drive ring being configured as a single injection-molded drive module.

Electromechanical motor especially a piezoelectric microstepper motor

A motor which includes two drive elements, especially piezoelectric bending actuators, having effective directions that are perpendicular to each other. These actuators act upon a drive ring to thereby rotate a shaft. Diagonally opposite securing elements are provided on the drive ring and are used to flexibly suspend the drive ring via respective articulated corner elements on respective fixing elements that are diagonally opposite the respective securing elements. The drive according to the invention is compact, having actuators that are non-radially hinged to the drive ring.

Electromechanical motor, especially a piezoelectric microstepper drive

A solid state actuator arrangement comprising an actuator which is configured as a solid state bending actuator and which has a first and a second end section opposite each other, a fastening device for fastening the first end section of the actuator in such a manner that it can still be adjusted, and connections for applying a driver signal to the actuator for adjusting the second end section by bending the actuator between at least two positions, an extension element being fastened to the free second end section of the actuator.

Solid state bending actuator comprising an extension element

A microstepper motor which comprises two electromechanical drive elements, especially piezoelectric bending actuators, having effective directions that are perpendicular to each other. These actuators act upon a drive ring to thereby rotate a shaft. The actuators are non-radially hinged to the drive ring via a torsion-proof, nested frame-type complex structure (drive module) including an interior drive ring, a frame and a U-shaped outer frame. The drive is compact and, the drive module is configured as a single injection-molded structure.

An information converter has at least two material layers having polygonal base surfaces, which are connected to each other in a shear-rigid way, wherein at least in one material layer a change of length can be induced. The polygonal base surface has at least two different interior angles.

Information processor and method for the production thereof

A metering device has an actuating unit within a housing in which an actuator is inserted and a hydraulic compensating element. The hydraulic compensating element is connected to the actuator and can be filled with a fluid when subjected to pressure. A first end of the actuator is provided with a first end cap. The metering device further has a stop that is disposed on the housing in the form of a seat, faces the first end cap, and defines a stopping position for the first end cap. The stop maintains a maximum distance between a sealing element and the end cap, the distance being smaller than the actuator traveling distance such that the actuator stroke beyond the end cap is sufficient for opening the valve. The first end cap hits the stop when moving in the direction of the hydraulic compensating element such that the movement is blocked.

Metering device

A motor which includes two drive elements, especially piezoelectric bending actuators, having effective directions that are perpendicular to each other. These actuators act upon a drive ring to thereby rotate a shaft. Two tension-compression bars, which are parallel to an effective direction, are connected to the drive ring, have respective joints at their ends and are connected to the ends of a diagonal bar, relative to which the ring can be displaced in the other effective direction. The diagonal bar itself can be displaced relative to fixing elements to an effective direction via a diagonal suspension. The drive is compact, having actuators that are non-radially hinged to the ring.

A solid-state actuator drive apparatus has&#x2014;a shaft, &#x2014;a pivot bearing for supporting the shaft, &#x2014;a drive body, &#x2014;at least two actuators for the excitation of the drive body and the shaft relative to each other for causing the shaft to rotate relative to the drive body, and&#x2014;a base element, on which these components are attached. Either the drive body is configured such that it has a drive body opening, and the shaft at least leads into the drive body opening, &#x2014;or the shaft is configured as a hollow shaft, and an element of the drive body having an annular or discoid circumference is disposed therein. The drive body is disposed stationary relative to the base element. The shaft is disposed in the pivot bearing and is adjustably disposed in the radial direction of the shaft relative to the base element by the solid-state actuators.

Solid-state actuator drive apparatus

A device for controlling a capacitive charge, in particular a piezoelectric actuator () has a signal generator () which is used to control a first end step () which is used to produce a discrete signal on the capacitive charge. Device has a second end step () which is used to generate a continuous signal on the capacitive charge. A counter-coupling of a deviation of an actual discrete signal is produced by a continuous signal required on the capacitive charge.

Hybrid control circuit

The invention relates to a method and a control unit for operating a hydraulic injection valve, which comprises at least one piezoelectric actuator (), a displaceable component () and a hydraulic element () such as bearing or a transmission system. The use of a drive voltage (U) modifies the length of an actuator (), which makes it possible to control the stroke of the displaceable component (a valve needle). The inventive control unit () produces a polarizing voltage (UB) which pre-stresses the actuator () and whose polarization direction is opposite to the polarization direction of said actuator (). Said invention makes it possible to obtain the greater modification of the length when the actuator () operates in the polarization direction than the drive voltage starts at 0 volts, as it was in practice before. Said invention makes it possible to reduce energy consumption.

Operating method for a hydraulic injection valve comprising a piezoelectric actuator and a control unit

An alcohol sensor having gas-sensitive layers made of polymers or inorganic oxides wherein a signal is read out by means of work function change which is produced in the form of a field-effect transistor.

Alcohol sensor using the work function measurement principle

A direct injection valve in a cylinder head () consists of a cylindrical housing comprising the following components: a valve () for dosing a fluid by means of a valve needle (), an actuator () for generating a stroke acting on the valve needle, and a fluid supply to the valve (). In order to minimise the heat transfer from the cylinder head () to the injection valve, an air gap () surrounds the housing of the injection valve, maintaining the housing and the cylinder head at a distance from each other.

Direct injection valve in a cylinder head

The injector tip of an injection valve which injects directly into the combustion chamber protrudes therein, thereby incurring the risk that combustion residues can become deposited on the injector tip. When the injection valve is in a closed state, the possible attachments of combustion residues along a separation line () are eliminated by means of a special configuration of the surface at the separation line () between the valve body and a valve plate. The surface is represented in a smooth, step-less, edge-less and curved manner.

Injection valve

The jacket surface of the piezoelectric actor body () is surrounded by an injector housing (), maintaining an intermediate space and is cooled by direct contact with an inert fluid which does not conduct electricity (), forming a fluid space in the injector housing () which is filled with fluid except for an air reservoir (). The volume of the air reservoir () is at least large enough to allow the thermal expansion of the heat coupling fluid () which occurs at the highest operating temperature of the actor body ().

Injector, especially fuel injection valve, with a piezoelectric actor

A power output stage for capacitive loads includes:

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Munich, Germany

Tim Schwebel