Sensor

Details Sensor Sensor

1997-10-07

1999-08-24

Tung, T.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204426, 204428, 277619, 277630, 277650, 277943, G01N 27407

Patent

active

059420928

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a sensor device, particularly for determining the oxygen content in exhaust gases of, internal combustion engines, of the type having a sensor element that is surrounded gas-tight by a seal and fixed in a housing, with the seal being inserted into the housing as a deformable sealing body that has an axially-extending throughgoing hole for receiving the sensor element.
DE-OS 41 26 378 discloses a sensor device in which a planar sensor element is fixed in a longitudinal housing bore by means of a seal, with the seal being disposed between two ceramic molded parts. The ceramic molded parts comprise Al.sub.2 O.sub.3. The seal is a pre-sintered steatite molded body that is deformed through the exertion of a pressure on one of the two ceramic molded parts during installation of the sensor device, and rests in a gas-tight manner against the circumference of the sensor element.
A problem that occurs when the sensor element is installed into the housing of the sensor device is that the sensor element cannot be stopped in the oblong holes of the ceramic molded parts and the sealing body, and can be damaged or destroyed by the hard edges of the ceramic molded bodies due to opposing twisting of the ceramic molded bodies or the sealing body with respect to the ceramic molded parts when the sealing body is pressed.
It is the object of the inventions to simplify the installation of the sensor element, specifically the insertion into the housing, and to increase production reliability and quality.


SUMMARY AND ADVANTAGES OF THE INVENTION

The above object generally is achieved according to a first feature of the invention by a sensor device, particularly for determining the oxygen content in exhaust gases of internal combustion engines, having a sensor element that is surrounded gas-tight by a seal and fixed in a housing, wherein: the seal is inserted into the housing as a deformable sealing body that has an axially-extending throughgoing hole for receiving the sensor element; the sealing body has formed-on structures that narrow the cross section of the throughgoing hole and are permanently deformed when the sensor element is inserted such that the sensor element is stopped and secured in the throughgoing hole by at least the formed-on structures.
The above object generally likewise is achieved according to a further feature of the invention by a sensor device, particularly for determining the oxygen content in exhaust gases of internal combustion engines, having a sensor element that is surrounded gas-tight by a seal and fixed in a housing, wherein: the seal is inserted into the housing as a deformable sealing body that is disposed between at least one ceramic molded part on the side of the measured gas and at least one connection-side ceramic molded part; the sealing body and the ceramic molded parts respectively have an axially-extending throughgoing hole for receiving the sensor element: the ceramic molded part on the side of the measured gas, the connection-side ceramic molded part and the sealing body each have form-fitting engaging elements that engage one another and rest against the adjacent opposite, touching end faces; and the form-fitting engaging elements are oriented radially with respect to the respective throughgoing holes such that the throughgoing holes extend in alignment with one another.
The sensor devices according to the invention, as described above, the have the advantage that the installation step of inserting the sensor element into the housing is simplified and, at the same time, the production reliability and quality of the sensor are improved. The invention according to the feature above effects the stopping arresting or fixing of the sensor element in the sealing body, so the sensor element retains its axial installed position upon insertion into the housing. With the invention according to the second feature, the throughgoing holes of the ceramic molded parts and the sealing body, which are configured as oblong holes in cross-section, are compelled to experience a

REFERENCES:
patent: 2271936 (1942-02-01), Carson
patent: 2985291 (1961-05-01), Schoepe et al.
patent: 3095619 (1963-07-01), Peterson
patent: 3767215 (1973-10-01), Brown
patent: 4732663 (1988-03-01), Kato et al.
patent: 5107071 (1992-04-01), Nakagawa
patent: 5711863 (1998-01-01), Henkelmann et al.

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