Ngk Spark Plug Company, Limited

Yoshiaki Matsubara

Yasuhiro Fujita

Takao Kojima

Takahiro Hayashi

Masataka Taguchi

Hitoshi Iimi

Makoto Hirasawa

Takahiro Suzuki

Shigeru Miyata

Kouji Matsuo

Takayoshi Atsumi

Masahiro Asai

Kazuhiro Kouzaki

Daisuke Miyata

Kouji Okazaki

Nobuyuki Suganuma

Mitsuru Kondo

Shohei Yoshiyasu

Kouzou Amano

Mamoru Kodera

Mitsuyoshi Shiba

Makoto Togawa

A gas sensor including a detection element having a detection portion; a metal shell that surrounds the detection element so as to expose the detection portion to a measured atmosphere; an outer tube that is fixed to the metal shell so as to cover a rear end side of the detection element; and a seal member that is contained inside the outer tube, the seal member having a lead wire insertion hole and a through hole that penetrates in the axial direction; a tubular holding member made of a resin having a lower coefficient of thermal expansion than the seal member, the tubular holding member being held inside the through hole, the tubular holding member having a ventilation hole; and a filter that covers the ventilation hole, the filter being joined to the holding member, the filter blocking water from passing therethrough, and the filter having air permeability.

Gas sensor and gas sensor unit

A gas sensor including: a gas detection element; a metal shell extending in an axial direction; and a metal cylinder extending in an axial direction, wherein a leading end portion of the metal cylinder surrounds a base end portion of the metal shell and is fixed to the metal shell via a circumferential welded portion. The metal shell includes: Fe in an amount equal to or more than 50.0 mass %; C in an amount of 0.02 mass % to 0.15 mass %; Cr in an amount of 11.5 mass % to 18.0 mass %; and Nb in an amount equal to or more than twice amount of C in mass %.

Gas sensor

A gas sensor comprises a cylindrical metallic housing, a sensor element having at a front end thereof a sensing portion and disposed axially in the housing with the sensing portion protruded from a front end of the housing, a sensor terminal fitted to a rear end of the sensor element to produce a signal output from the sensing portion, a first protective cover attached to a front end portion of the housing to cover the sensing portion and a second protective cover attached to a rear end portion of the housing to cover the sensor terminal. The first and second protective covers includes attachment portions attached around the front and rear end portions of the housing, respectively. At least one of the attachment portions of the first and second protective covers has a lower hardness than a remaining portion of the protective cover.

Protective covers for gas sensor, gas sensor and gas sensor manufacturing method

An oil agent of the kind and amount suitable for a post-step is applied on a workpiece regardless of the kind and residual amount of an oil agent used in a pre-step. A workpiece on which a first oil agent is deposited is immersed in a degreasing solution, taken out of the degreasing solution and cleaned to thereby remove all the first oil agent. Then, the workpiece having all the first oil agent removed is immersed in an oil agent solution to thereby newly deposit a second oil agent of the kind and amount suitable for a post-step on the workpiece.

Method for depositing oil agent on workpiece

An oxygen sensorincludes an oxygen detection element, which assumes a hollow tubular shape extending along the axis. The oxygen detection elementhas a closed tip end and an opened rear end. An internal electrode layeris formed on an inner circumferential surfaceof the oxygen detection element. The sensoralso has a terminal memberwhich is in contact with the internal electrode layerand in electrical connection therewith. The terminal memberhas press contact portionsandwhich come into press contact with the inner circumferential surfaceof the oxygen detection elementto hold the terminal memberin the oxygen detection element, and conduction portionswhich come into press contact with the internal electrode layeron the inner circumferential surfaceof the oxygen detection elementand into electrical connection with the internal electrode layer. Pressing force per unit area at the conduction portionsis smaller than that at the press contact portionsand

It is an object of the invention to provide a sensor which is highly reliable, and a method or producing a sensor which is highly reliable, and which can be easily produced. A method of producing a sensor in which bending of a heater and the like hardly occur is provided. In the invention, an oxygen sensor () has: an oxygen sensor element (); a metal shell (); first and second sensor terminal metal parts (), (); a heater (); heater terminal metal parts (), (); a metal outer tube (); and a separator () which is housed inside the metal outer tube (), in which the terminal metal part () and the like and the heater () are held, and which provides insulation between the terminal metal part () and the like. An outer-tube butting face () is formed in a flange portion () of the separator (). In the metal outer tube (), a flange butting face () which butts against the outer-tube butting face () is formed. Both of the outer-tube butting face () and the flange butting face () form an inclined face which is more radially outward positioned as further advancing toward the tip end. The separator () is pressed toward the rear end. The pressing is conducted by deforming the metal outer tube (), and deforming a pressing metal part () which is placed around a tip end side portion () of the separator ().

Sensor, sensor producing method, and assembly of separator and urging member

A gas sensor includes a detection element for detecting a gas component of a gas to be measured, a casing for holding the detection element and a seal member forming a reference gas space together with the casing. The seal member has an end surface exposed to the atmosphere and a through-hole for establishing communication between the atmosphere and the reference gas space. A cylindrical insert member is inserted in the through-hole of the seal member. A sheetlike air permeable filter is sandwiched between an inner surface of the through-hole of the seal member and the cylindrical insert member so as to cover an atmosphere side opening portion of the cylindrical insert member. The atmosphere side opening portion of the cylindrical insert member is retracted from the end surface of the seal member toward the interior of the through-hole, whereby an atmosphere side face of the air permeable filter is retracted from the end surface of the seal member.

A threaded portion is formed on a metal shell of a spark plug. Within a mounting base of the metal shell, a pressure sensor is arranged in such a direction that it generates an electrical signal in response to a variation in a tightening load of the spark plug. A slit is formed as a pressure-introducing channel along an axis of the spark plug in the threaded portion of the metal shell so that the slit is communicated with an interior of the mounting base.

Spark plug with built-in pressure sensor

A device for detecting a change in internal pressure of a cylinder includes a cylinder head, an ignition plug threadingly fitted into a plug insertion hole of the cylinder head. An annular piezoelectric sensor is secured in the plug insertion hole by screwing the plug into the insertion hole. The sensor has such an outer periphery that, when the ignition plug is screwed into the plug hole, a part of the outer periphery of the sensor placed is brought into engagement with an inside periphery of the plug hole and is thereby prevented from being further rotated in the screwing direction. By using a gasket having the same relative shape to the periphery of the plug insertion hole as that of the above sensor, rotation of the sensor can be prevented even when the sensor does not have such a relative shape.

Device for detecting change in internal pressure of cylinder

A retaining ring is provided for temporarily holding a pressure sensor in place within a spark plug attaching hole prior to installation of a spark plug. The retaining ring is resiliently deformed into a stressed positioned to attach itself to a circumferential wall of the spark plug attaching hole. In one embodiment, a gasket is adapted to serve also as such a retaining ring.

Device for temporarily holding pressure sensor in place within spark

A tool is provided for loosening or tightening a spark plug while interposing a gasket and a pressure sensor between the spark plug and a cylinder head. The tool consists of concentric, relatively rotatable inner and outer cylinders. The inner cylinder is engageable with the spark plug for rotation together therewith and for loosening or tightening the same. The outer cylinder is lockingly engageable with a cylinder head by means of an axial projection of the outer cylinder and a groove of the cylinder head. The outer cylinder is further lockingly engageable with the gasket by means of a locking leg of the outer cylinder and a peripheral cut of the gasket. The gasket is thus lockingly engageable with the cylinder head by way of the outer cylinder for preventing the pressure sensor from rotating relative to the cylinder head when the spark plug is loosened or tightened.

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Nagoya, Japan

Yoshiaki Matsubara