Gas sensor

A gas sensor and sensing element technology, applied in instruments, scientific instruments, measuring devices, etc., can solve problems such as easy collision, unstable structure of the atmosphere-side insulator 95, and damage to the electrode terminals of the sensing element, etc., and achieve a lightweight structure , low-cost effect

Active Publication Date: 2007-05-16
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, for the sensing element 92 to be fixed with an inclination to the element holder 934, the atmosphere side insulator 95 becomes structurally unstable.
In this case, the corner area 952 of the end face 951 of the atmosphere side insulator 95 is likely to collide with the element holder 934, causing the electrode terminal 921 of the sensor element 92 to be destroyed.

Method used

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no. 1 example

[0050] A gas sensor according to a first embodiment of the present invention will be described in detail with reference to FIGS. 1-6.

[0051] As shown in FIGS. 1 and 2, the gas sensor 1 of the present invention includes a sensing element 2 having a rectangular cross section, which has a detection portion for detecting the concentration of a specific gas in the gas to be measured (hereinafter referred to as the measurement gas). 2a and a base end portion 2b, an element holder 3 for inserting and holding the sensor element 2, and an atmosphere side insulator 4 provided at a position so as to cover the sensor in an area close to the base end of the element holder 3. base of sensing element 2.

[0052] The element holder 3 includes a housing 31 formed with a threaded portion 31a which can be screwed into the flow channel region of the measurement gas to allow the sensing element 2 to detect the measurement gas; An element-side insulator 32 inside the housing 31 . The sensor ele...

no. 2 example

[0073] Next, a gas sensor 1A according to a second embodiment of the present invention will be described with reference to FIGS. 7 and 8 . Except for some features, the gas sensor of the second embodiment is similar in structure to the gas sensor of the first embodiment, and redundant descriptions will be omitted to focus on these distinguishing features.

[0074] 7 is a sectional view of a gas sensor 1A of a second embodiment, and FIG. 8 is a sectional view of a gas sensor 1A showing a structure in which a projecting portion 11A is formed at a base end of an element holder 3A.

[0075] With the gas sensor 1A of the second embodiment, an element holder insulator 32A forming the element holder 3 has a cylindrical body 32a whose base end protrudes beyond a base end, that is, to a fitting portion 31h of the housing 31A. outside. Also, the cylindrical body 32a has a large-diameter portion 321 formed between the first and second cylindrical portions 32a and 32c, which is accommoda...

no. 3 example

[0079] Next, a gas sensor 1B according to a third embodiment of the present invention will be described with reference to FIGS. 9 to 11 . Except for some features, the gas sensor 1B of the third embodiment is similar in structure to the gas sensor 1 of the first embodiment, and redundant descriptions will be omitted to focus on these distinguishing features.

[0080] 9 is a cross-sectional view of the gas sensor 1B of the third embodiment, and FIG. 10 is a cross-sectional view of the gas sensor 1B along line C-C of FIG. FIG. 11 is a cross-sectional view of the gas sensor 1B along line D-D in FIG. 10 .

[0081] As for the third embodiment, the gas sensor 1B includes an inner protective cylinder 361 coaxially arranged at the base end of the atmosphere side cover 36 and supported by the base end of the housing 31B, which has a shape fixed by the outer circumference of the first cylindrical extension 31c. One base end supported on the ground and the other base end portion 362 on ...

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Abstract

A gas sensor is disclosed having an element holder body with which a senor element is fixedly supported, and an atmosphere-side insulator covering a base portion of the sensor element and providing electrical connection between lead wires and terminal electrodes of the sensor element. The element holder body includes a housing and an element-side insulator fixedly mounted in the housing. The atmosphere-side insulator incorporates therein a plurality of spring terminals held in electrical contact with the electrode terminals of the sensor element. At least one of the element holder body and the atmosphere-side insulator carries thereon convexed portions with which the atmosphere-side insulator can tilt with respect to the element holder body.

Description

[0001] Cross-references to related applications [0002] This application is related to Japanese Patent Application Nos. 2005-326464 and 2006-192590 filed on November 10, 2005 and July 13, 2006, respectively, the contents of which are incorporated herein by reference. technical field [0003] The invention relates to a gas sensor for detecting the concentration of a specific gas in a gas to be measured. Background technique [0004] In the related art, it is a common practice to have an exhaust system in an internal combustion engine of a motor vehicle on which a gas sensor is installed to detect the concentration of a specific gas such as oxygen or nitrogen oxide contained in the exhaust gas. [0005] An example of such a gas sensor is disclosed in Japanese Unexamined Patent Publication No. 2003-294684. This related technique is shown in FIGS. 14 to 17 . As shown in FIG. 14, the gas sensor 9 includes a sensing element 92 constituted by a plate-like rod, which has a detect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/409G01N27/12
Inventor 山内政伸
Owner DENSO CORP
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