Pressure-measuring device with additional diaphragm

A pressure-measuring device for recording a pressure in a combustion chamber of an internal combustion engine, comprising:

• a force transmission body, situated in a housing, which is exposed to the combustion chamber and which transmits the combustion chamber pressure to a pressure-measuring unit at least indirectly by an axial motion;
• a flexible diaphragm situated between the force transmission body and the housing, wherein the flexible diaphragm is configured to be resilient to implement an axial motion of the force transmission body within the housing;
• and
• a flexible additional diaphragm connected ahead of the flexible diaphragm on the combustion chamber side, which seals the flexible diaphragm from the combustion chamber, wherein:
• on an outer side of the force transmission body a first supporting ring is situated and on an inner side of the housing a second supporting ring is situated, and wherein the flexible additional diaphragm is situated between the first and the second supporting ring,
• an annular gap is between the first and the second supporting ring,
• the flexible additional diaphragm is situated on the first and the second supporting rings and covers the annular gap over end faces of the first and the second supporting rings,
• each end face includes a rounded edge, and
• the additional diaphragm lies against each rounded edge only partially.