Measuring probe

Details Measuring probe Measuring probe

2000-05-31

2001-11-20

Tung, T. (Department: 1743)

Chemistry: electrical and wave energy

Apparatus

Electrolytic

C204S426000, C204S428000

Reexamination Certificate

active

06319376

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a sensor, particularly for determining the oxygen content in exhaust gasses of internal combustion engines.
BACKGROUND INFORMATION
European Patent No. EP 624 791 (corresponding to U.S. Pat. No. 5,329,806) describes a gas sensor where a sensor element is fixed in a tubular, metallic housing in a gas-tight manner. At its lower part, the tubular housing has a lip facing radially outward which forms a sealing flange. The gas sensor is mounted in an opening of an exhaust system, the lip sitting on a sealing seat formed in the opening. A banjo bolt is led over the housing and screwed into a thread arranged in the opening, thereby joining the lip to the exhaust system in a gas-tight manner. Problematic in this design is, however, that the pressing or upsetting of the relatively thin-walled material of the housing can produce microcracks at the lip which can cause the leakiness of the housing.
SUMMARY OF THE INVENTION
The present invention has the advantage over the related art that the sealing flange is absolutely gas-tight, and the inclined sealing surfaces produce an absolutely gas-tight sealing seat at the exhaust pipe. Moreover, the hollow design of the sealing flange produces a spring effect which also supports the sealing effect.
It is particularly advantageous for the inclined sealing surfaces to be designed in an angle between 10° and 30°, preferably of 20°. Arranging the sealing flange behind the sealing arrangement for the sensor element, as viewed from the measuring gas side, has an advantageous effect on the installation of the sensor. In this manner, the sensor element can first be equipped with the ceramic parts of the sealing arrangement. The housing is then slipped over the sensor element equipped with the sealing arrangement. Furthermore, it is expedient to attach a connecting piece to the exhaust pipe, the connecting piece, at the end face, forming a sealing seat for the sealing flange.


REFERENCES:
patent: 4956072 (1990-09-01), Kojima et al.
patent: 5246562 (1993-09-01), Weyl et al.
patent: 5329806 (1994-07-01), McClanahan et al.
patent: 5900129 (1999-05-01), Tsuji et al.
patent: 0 624 791 (1993-01-01), None
patent: 63 259453 (1989-02-01), None

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