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Sensing element seal for a gas sensor

Imported: 24 Feb '17 | Published: 06 Jan '04

Helmut Weyl, Johann Wehrmann

USPTO - Utility Patents

Abstract

A sensor, in particular for determining the oxygen content in exhaust gases of internal combustion engines, is provided. The sensor includes a sensing element arranged in a housing having a reference gas space-side housing part, and a sensing element seal which hermetically separates a reference gas space from a measured gas space. Provided inside the reference gas space-side housing part is a sleeve, enclosing the sensor element on a longitudinal segment, which forms a receptacle for the sensing element seal.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a longitudinal section through a sensor of the present invention.

FIG. 2 is a sectioned depiction of a second embodiment of the sensor of the present invention.

FIG. 3 is a sectioned depiction of a sensing element seal in accordance with a third embodiment of the present invention.

FIG. 4 is a sectioned depiction of a sensing element seal in accordance with a fourth exemplary embodiment of the present invention.

Claims

1. A sensor for determining oxygen content in exhaust gases of an internal combustion engine, comprising:

2. The sensor according to claim 1, wherein the sleeve is joined in a gas-tight manner to the reference gas space-side housing part.

3. The sensor according to claim 1, further comprising:

4. The sensor according to claim 1, wherein the receptacle is cup-shaped and has a base with a recess for passage of the sensing element, the sensor further comprising:

5. The sensor according to claim 1, wherein the sensing element seal includes at least one glass seal.

6. The sensor according to claim 5, further comprising:

7. The sensor according to claim 6, wherein the at least one thermal insulation element forms a powder seal.

8. The sensor according to claim 7, wherein the glass seal is arranged between at least two powder seals.

9. The sensor according to claim 8, further comprising:

10. The sensor according to claim 7, wherein the at least one thermal insulation element is inserted into the sensor as a pre-pressed ring, the pre-pressed ring being deformable into powder by a compressive force.

11. The sensor according to claim 5, further comprising:

12. The sensor according to claim 1, wherein the sensing element is secured in the metal housing using a powder packing.

13. The sensor according to claim 12, wherein the powder packing is arranged between a first ceramic element and a second ceramic element in a pressed state.

14. The sensor according to claim 12, wherein the powder packing is formed from a pre-pressed and pre-sintered steatite ring, the steatite ring deforming into powder upon pressing.

15. The sensor according to claim 1, wherein the sensing element seal is positioned in the receptacle formed by the sleeve.

16. The sensor according to claim 15, wherein the sleeve and the receptacle together are a one-piece deep drawn part.

17. A sensor for determining oxygen content in exhaust gases of an internal combustion engine, comprising: