Kistler Holding Ag

Robert Bosch

Reinhold Hess

Peter Wolfer

Claudio Cavalloni

Christoph Kern

Steffen Schott

Michael Mueller

Pavlo Saltikov

Michael Kleindl

Reiko Zach

Andrea Bertola

Thomas Ludwig

Juergen Krueger

A pressure measuring device suitable for disposition in a chamber of an internal combustion engine. The pressure measuring device has a housing, a force transmitting element that is effectively connected to a pressure sensor, and a sensor cage that surrounds the pressure sensor. The sensor cage is connected to the housing by a circumferential weld seam only at one connection segment of the housing. In this way, it is possible to achieve a defined pre-tensioning of a metal diaphragm that is connected on the one hand to the sensor cage and on the other hand to the force transmitting element.

Pressure measuring device

The invention relates to a component for installation in force or pressure sensors, in particular in a glow plug. The component comprises a disc-type or punched-disc type measuring element consisting of a piezoelectric material, punched-disc type or disc-type electrodes that lie on either side of the measuring element. The electrodes have contact points for contacting conductors. The component comprises in addition a respective transmission body or several transmission bodies that are located outside the electrodes, on either side of the latter. The measuring element, electrodes and transmission bodies are held together mechanically by an external, electrically insulating film.

Component for piezoelectric force or pressure sensors, held together by an electrically insulating film

A sheathed-element glow plug is used to be situated in a chamber in an internal combustion engine. The sheathed-element glow plug has a housing, a pin-shaped heating element, which extends partially from the housing and a pressure sensor which is situated in an inner chamber of the housing. A prestressing sleeve is provided, in this context, which applies a prestressing to the pressure sensor.

Sheathed-element glow plug

The invention relates to a pressure sensor (), comprising a housing (), a housing element () which may be exposed to a pressure chamber (), mounted on the housing () by means of a metallic membrane () and a measuring cell () which can indirectly measure a pressure acting on the housing element () and transmitted to the measuring cell () as a force resulting therefrom. According to the invention, said pressure sensor () comprises a housing element () embodied as a pin and projects out of the housing (). The advantage of such an arrangement is only a small drilling to a pressure chamber () need be provided, in order to carry out a pressure measurement. The pin () need only be so long that the front end thereof, in the assembled state, approximately reaches the wall () of the pressure chamber ().

Pressure sensor

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Winterthur, Switzerland

Reinhold Hess