Special seal geometry for exhaust gas sensors for producing high leak tightness with respect to the measurement chamber

Patent metadata

Field	Value
Publication number	US-10024432-B2
Application number	US-201414775471-A
Country	US
Kind code	B2
Filing date	Feb 27, 2014
Priority date	Mar 12, 2013
Publication date	Jul 17, 2018
Grant date	Jul 17, 2018

Abstract

A sensor system, for sensing at least one property of a measured gas in a measured-gas space, includes a probe for sensing the property of the measured gas. The probe has at least one sensor element and at least one housing surrounding the sensor element. The housing is configured so that the sensor element in the housing is capable of being impinged upon with the measured gas. The sensor system also includes a receiving element connectable to a wall of the measured-gas space. The probe is introducible along an insertion axis into the receiving element and securable in the receiving element. The probe is capable of being sealed off from the measured-gas space by at least one seal. The seal encompasses at least one linear seal.

First claim

What is claimed is:

1. A sensor system for sensing at least one property of a measured gas in a measured-gas space, comprising:
a probe for sensing the property of the measured gas, the probe having at least one sensor element and at least one housing surrounding the sensor element, the housing being configured so that the sensor element in the housing is impinge-able upon by the measured gas; and
a receiving element connectable to a wall of the measured-gas space, the probe being introducible along an insertion axis into the receiving element and securable in the receiving element;
wherein the housing has a supported element and the receiving element has a sealing element, the supported element and the sealing element forming a seal;
wherein with the probe introduced into the receiving element, the supported element is supported on the sealing element;
wherein the sensor system further includes at least one securing element, the securing element being configured to secure the probe in the receiving element;
wherein the probe seals the measured-gas space via the seal, the seal is a first linear seal, and the first linear seal prevents emergence between the probe and the receiving element of the measured gas from the measured-gas space when both: (i) the probe is in an installed state in the receiving element, and (ii) the receiving element is connected to the wall of the measured-gas space; and
wherein the first linear seal is a conical-to-radius shaped seal.

2. The sensor system of claim 1 , wherein the supported element annularly surrounds the probe.

3. The sensor system of claim 1 , wherein the supported element and the sealing element are configured in a self-centering manner.

4. The sensor system of claim 1 , wherein the supported element is configured at least partly as a spring element.

5. The sensor system of claim 1 , wherein the seal includes at least two linear seals.

6. The sensor system of claim 1 , wherein the probe is detachably connectable to the receiving element.

7. The sensor system of claim 1 , wherein the at least one securing element has at least one thread having a housing-side thread and a receiving element-side thread.

8. The sensor system of claim 1 , wherein the receiving element is configured as a weld-in fitting.

9. The sensor system of claim 1 , wherein the supported element annularly surrounds the probe, in particular in the form of an annular shoulder.

10. The sensor system of claim 1 , wherein the supported element is configured at least partly as a spring element, in particular as a cup spring.

11. The sensor system of claim 1 , wherein the securing element and the supporting element form a second linear seal, the second linear seal being a conical-to-radius shaped seal, wherein the probe seals the measured-gas space via the second linear seal.

12. The sensor system of claim 1 , wherein the housing includes at least one protective tube having at least one interior space and at least the sensor element received in the interior space, the protective tube being configured so that the measured gas can penetrate into the interior space.

13. The sensor system of claim 12 , wherein the protective tube includes a double-walled protective tube, the double-walled protective tube having an annular gap, the measured gas being capable of flowing through the annular gap into the interior space.

14. The sensor system of claim 13 , wherein the protective tube points into the measured-gas space in a tilted manner with respect to the insertion axis.

Assignees

• Bosch Gmbh Robert

Inventors

• Linck-Lescanne Markus
• Wilde Juergen
• Buchholz Bastian
• Doraisamy Narendiran

Classifications

• F01N13/008 Primary

  Mounting or arrangement of exhaust sensors in or on exhaust apparatus (sensor arrangements for engine control F02D41/1439) · CPC title

• G01N27/407

  for investigating or analysing gases {(G01N27/411 takes precedence)} · CPC title

• G01M15/104

  using oxygen or lambda-sensors (testing catalytic converters F01N3/18, F01N11/007) · CPC title

• F16J15/062 Primary

  characterised by the geometry of the seat · CPC title

• G01N27/4078

  Means for sealing the sensor element in a housing · CPC title