Pressure sensor measuring element and pressure sensor provided with the latter

A pressure sensor measuring element for detecting pressure in a combustion space of an internal combustion engine, the pressure sensor measuring element comprising:

• a separating diaphragm;
• a plunger configured to transmit deflections of the separating diaphragm to a force measuring element;
• and
• a sleeve that is configured to receive the plunger and which is closed by the separating diaphragm at a first end arranged to face the combustion space, the sleeve being further configured to hold the force measuring element at a second end that is opposite to the first end;
• the plunger being configured integrally with the separating diaphragm as a diaphragm/plunger unit, and the sleeve and the diaphragm/plunger unit being formed from the same metal material;
• the sleeve including a radially outward-extending flange at the first end and an annular projection projecting from the flange with a smaller outside diameter axially in the direction of the separating diaphragm;
• and
• the separating diaphragm having an outer thickened annular edge region which is flush with the flange on the outside and engages over the annular projection on the inside.

A pressure sensor measuring element for detecting pressure in a combustion space of an internal combustion engine, the pressure sensor measuring element comprising:

• a separating diaphragm;
• a plunger configured to transmit deflections of the separating diaphragm to a force measuring element;
• and
• a sleeve that is configured to receive the plunger and which is closed by the separating diaphragm at a first end arranged to face the combustion space, the sleeve being further configured to hold the force measuring element at a second end that is opposite to the first end;
• the plunger being configured integrally with the separating diaphragm as a diaphragm/plunger unit, and the sleeve and the diaphragm/plunger unit being formed from the same metal material;
• and
• the sleeve defining a cavity between a sleeve wall and the diaphragm/plunger unit, the cavity being evacuated or being filled with solid particles composed of a material with a higher melting point than at least one of combustion space temperatures and a radiation barrier.

A pressure sensor measuring element for detecting pressure in a combustion space of an internal combustion engine, the pressure sensor measuring element comprising:

• a separating diaphragm;
• a plunger configured to transmit deflections of the separating diaphragm to a force measuring element;
• and
• a sleeve that is configured to receive the plunger and which is closed by the separating diaphragm at a first end arranged to face the combustion space, the sleeve being further configured to hold the force measuring element at a second end that is opposite to the first end;
• the plunger being configured integrally with the separating diaphragm as a diaphragm/plunger unit, and the sleeve and the diaphragm/plunger unit being formed from the same metal material;
• and
• the plunger defining an orifice that is accessible from the second end of the sleeve and extends in a longitudinal direction of the sleeve.

A pressure sensor for detecting the pressure in the combustion space of the internal commission engine during operation of the internal combustion engine, the pressure sensor comprising:

• a pressure sensor measuring element for detecting pressure in a combustion space of an internal combustion engine, the pressure sensor measuring element comprising:
• a separating diaphragm;
• a plunger configured to transmit deflections of the separating diaphragm to a force measuring element;
• and
• a sleeve that is configured to receive the plunger and which is closed by the separating diaphragm at a first end arranged to face the combustion space, the sleeve being further configured to hold the force measuring element at a second end that is opposite to the first end;
• and
• the plunger being configured integrally with the separating diaphragm as a diaphragm/plunger unit, and the sleeve and the diaphragm/plunger unit being formed from the same metal material;
• and
• an outer sensor housing configured to fasten to a component delimiting the combustion space, the sleeve being received in the sensor housing and being fastened with an end region formed at its first end to the sensor housing;
• the outer sensor housing including a tool engagement region with tool engagement surfaces for a tool;
• and
• the tool engagement region including, between a thread for screwing in the pressure sensor and at least one first tool engagement surface, a projection configured to guide the tool to prevent the tool from slipping off toward the thread, and the tool engagement region further including at least two mutually opposite second tool engagement surfaces that are formed continuously, without a projection, as an outermost radial extent of the pressure sensor on an angular range, covered by the second tool surfaces, in relation to the longitudinal mid-axis of the pressure sensor.

A pressure sensor measuring element for detecting pressure in a combustion space of an internal combustion engine, the pressure sensor measuring element comprising:

• a separating diaphragm;
• a plunger configured to transmit deflections of the separating diaphragm to a force measuring element;
• and
• a sleeve that is configured to receive the plunger and which is closed by the separating diaphragm at a first end arranged to face the combustion space, the sleeve being further configured to hold the force measuring element at a second end that is opposite to the first end;
• the plunger being configured integrally with the separating diaphragm as a diaphragm/plunger unit, and the plunger, the sleeve and the diaphragm/plunger unit being formed from the same metal material;
• the diaphragm/plunger unit including, at an end of the plunger which is opposite to the separating diaphragm, a second diaphragm which is flush with the second end of the sleeve;
• and
• the force measuring element being fastened at one end to the second end of the sleeve and at another end to an end of the plunger which faces away from the separating diaphragm.

A pressure sensor measuring element for detecting pressure in a combustion space of an internal combustion engine, the pressure sensor measuring element comprising:

• a separating diaphragm;
• a plunger configured to transmit deflections of the separating diaphragm to a force measuring element;
• and
• a sleeve that is configured to receive the plunger and which is closed by the separating diaphragm at a first end arranged to face the combustion space, the sleeve being further configured to hold the force measuring element at a second end that is opposite to the first end;
• the plunger being configured integrally with the separating diaphragm as a diaphragm/plunger unit, and the sleeve and the diaphragm/plunger unit being formed from the same metal material;
• the diaphragm/plunger unit including, at an end of the plunger which is opposite to the separating diaphragm, a second diaphragm which is flush with the second end of the sleeve;
• the sleeve including a radially outward-extending flange at the first end and an annular projection projecting from the flange with a smaller outside diameter axially in the direction of the separating diaphragm;
• and
• the separating diaphragm having an outer thickened annular edge region which is flush with the flange on the outside and engages over the annular projection on the inside.