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Gas sensor provided with flange portion of cover thereof

A technology of gas sensors and flanges, which is applied in the testing of machines/structural components, instruments, mechanical equipment, etc., and can solve problems such as large insulator load and insulator damage

Active Publication Date: 2018-08-10
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, burrs may be formed at the corners in the flange portion of the inner boot and the corners in the flange portion of the outer boot due to protrusions in a part of the material.
In particular, in the case where the burr is formed on the corner facing the insulator, if there is no method of controlling the positional relationship between the flange portion of the inner shroud and the flange portion of the outer shroud, then from the inner shroud The load applied to the insulator by the flange portion becomes large, so that the insulator may break

Method used

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  • Gas sensor provided with flange portion of cover thereof
  • Gas sensor provided with flange portion of cover thereof
  • Gas sensor provided with flange portion of cover thereof

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0041] Such as figure 1 As shown, the gas sensor 1 according to the present embodiment is provided with a sensor element 2 , an insulator 3 , a housing 4 , an inner housing 5 and an outer housing 6 . The sensor element 2 includes a detection portion 21 exposed to the detection gas G to perform gas detection. The insulator 3 is made of a ceramic material and supports the sensor element 2 in a state where the detection portion 21 protrudes from the sensor element 2 , and the sensor element 2 is inserted through the insulator 3 . The case 4 is made of metal and is provided in the outer periphery of the insulator 3 and supports the insulator 3 .

[0042] Such as figure 2 As shown, the inner shroud 5 is made of metal. The inner cover 5 covers the detection part 21 and has inner through holes 521 and 531 . The outer cover 6 is made of metal material. The outer cover 6 covers the inner cover 5 to form a gas passage 60 through which the detection gas G flows and has outer throug...

no. 2 example

[0130] In this embodiment, only the case where the setting of the positional offset between the end surface 511 of the inner flange portion 51 and the end surface 611 of the outer flange portion 61 is different from that of the first embodiment will be described.

[0131] Such as Figure 15 As shown, according to the gas sensor 1 of the present embodiment, the end surface 511 of the entire circumference of the inner flange portion 51 in the circumferential direction C is positioned radially larger than the end surface 511 of the entire circumference of the outer flange portion 61 in the circumferential direction C. The position of the end surface 611 is closer to the outer side R1 with respect to the radial direction R. As shown in FIG. In the inner flange portion 51 , a plastically deformed protrusion 514 of the burr 514A is formed in the corner portion 513 between the end surface 511 and the surface 512B in the rear end side L2 . Further, in the outer flange portion 61 , a ...

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PUM

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Abstract

A gas sensor (1) comprises a sensor element (2) with a detection portion (21), an insulator (3) for supporting the sensor element in a state that the detection portion protrudes from the sensor element, a housing (4) supporting the insulator, an inner cover covering the detection potion, and an outer cover covering the inner cover, wherein the sensor element penetrates through the insulator. An inner flange portion (51) of the inner cover and an outer flange portion (61) of the outer cover are supported between the insulator and the housing. A protrusion (514) is formed on a corner portion (513) facing the insulator (3), the protrusion contacting with the insulator. An end face (611) of the outer flange portion (61) is positioned radially closer to an outer side (R1) with respect to a radial direction (R), than a position of an end face (511) of the inner flange portion (51).

Description

technical field [0001] The present disclosure relates to a gas sensor having a structure covering a detection portion of a sensor element. Background technique [0002] The gas sensor is provided in a duct of an exhaust system of an internal combustion engine and detects exhaust gas flowing through the duct as a detection gas. The gas sensor performs gas detection by detecting changes in the oxygen concentration in the gas. The use of the gas sensor includes detecting the oxygen concentration in the exhaust gas emitted from the internal combustion engine, detecting the air-fuel ratio (A / F) of the internal combustion engine from the exhaust gas, detecting the A / F obtained from the exhaust gas relative to the theoretical A / F value Is it the rich or lean side, and the detection of specific gases such as NOx. [0003] Gas sensors use a sensor element with a solid electrolyte and a pair of electrodes. The sensor element is provided with a detection portion in which a detection...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/409G01N27/41G01N27/407
CPCG01N27/4078G01N27/409G01N27/41F01N13/008F01N2560/025G01N33/0037Y02A50/20G01M15/104G01N27/4067G01N27/4071
Inventor 神谷康敬濑川佳秀山田弘一
Owner DENSO CORP