JPH03123260U

JPH03123260U -

Info

Publication number: JPH03123260U
Application number: JP3182090U
Authority: JP
Priority date: 1990-03-29
Filing date: 1990-03-29
Publication date: 1991-12-16

Description

[Brief explanation of drawings]

第１図は本考案の一実施例を示すセンサ部断面
図、第２図は同上実施例に係るコンタクトプレー
トの説明図でａは全体平面図、ｂは全体側面図、
ｃはコンタクトプレートの正面図、ｄはコンタク
トプレートの断面図、第３図は従来例を示す全体
断面図、第４図は第３図におけるセンサ部断面図
である。１……ホルダー、２……ジルコニアチユーブ、
１１……内側電極（出力取出用）、１２……外側
電極（接地側）、１３……金属ワツシヤ、１４…
…保護層、２３……コタクトプレート、２４……
接地側導電部、２５……出力側導電部、２８……
絶縁層、２９……貴金属層、３４……導電部材。 FIG. 1 is a sectional view of a sensor section showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram of a contact plate according to the same embodiment, in which a is an overall plan view, b is an overall side view,
c is a front view of the contact plate, d is a sectional view of the contact plate, FIG. 3 is an overall sectional view showing a conventional example, and FIG. 4 is a sectional view of the sensor portion in FIG. 3. 1... Holder, 2... Zirconia tube,
11...Inner electrode (for output extraction), 12...Outer electrode (ground side), 13...Metal washer, 14...
...Protective layer, 23...Kotaku plate, 24...
Ground side conductive part, 25... Output side conductive part, 28...
Insulating layer, 29... noble metal layer, 34... conductive member.

Claims

[Claims for Utility Model Registration] Electrodes are formed on a portion of the inner and outer surfaces of a zirconia tube whose tip is closed, and the tip of the electrode on the outer surface is covered with a protective layer and is brought into contact with engine exhaust gas. It is configured to detect the oxygen concentration in engine exhaust gas by the electromotive force generated between the ground side electrode on the outer surface and the output side electrode on the inner surface that is in contact with the atmosphere, and is screwed onto the engine exhaust pipe wall. In the oxygen sensor for an internal combustion engine, in which the base end of the zirconia tube is locked to the distal end of the holder, at least a part of the ground side electrode extends to the base end surface of the zirconia tube, and the ground side electrode and Oxygen for an internal combustion engine, characterized in that a conductive member is provided to electrically connect the inner surface of the holder on the proximal side of the threaded part of the holder, and a ceramic layer is provided to cover an electrode on the outer surface that is in direct contact with the engine exhaust gas. sensor.