Ngk Spark Plug Company, Limited

Noboru Matsui

Makoto Kume

Tomohiro Nakamura

Hiroshi Inagaki

Yuichi Yamada

Nobuhiro Hayakawa

Satoshi Teramoto

Takeshi Kawai

Takuya Saito

Hideki Matsubara

Shinichiro Iwama

Kumiko Yoshikawa

Takahiro Akiyama

A gas sensor including coating layers () and () of fluorine or a fluorine compound formed on the surface of a separator (), including a front separator () and a rear separator (), disposed inside a sheath (). The coating layers () and () have water impermeability and water repellency. Even in the case where moisture contained in the atmosphere within a sheath () forms dew on the surface of the separator (), the coating layers () and () prevent soaking of moisture into the separator (), to thereby secure the insulation property of the separator (). Also, the coating layers () and () having water repellency prevent a water droplet from spreading on the surface of the separator () with resultant formation of a film of water, to thereby prevent flow of leakage current via a film of water.

Gas sensor

A sensor including: a sensor element; terminal metal fittings; a terminal surrounding member; and lead wires. The terminal surrounding member is divided into a front side surrounding member and a rear side surrounding member, and a rear end face of the front side surrounding member abuts a front end face of the rear side surrounding member. The sensor includes a fitting structure including a recess portion formed on one of the rear and front end faces and a protruding portion formed on the other, such that one of the front side surrounding member and the rear side surrounding member is prevented from rotating relative to the other about an axis of the sensor, and is prevented from deviating in a direction perpendicular to the axis of the sensor relative to the other.

Sensor

A sensor () including a plate-shaped sensor element () extending in a front-rear direction and having at least 3 electrode terminals () provided on at least one side surface () of the sensor element at intervals in a lateral direction; a plurality of metallic terminal members () connected to the electrode terminals () of the sensor element (); and a separator () surrounding and insulating the plurality of metallic terminal members (). The metallic terminal members () each has a crimp portion () formed at a rear end thereof and a lead wire () is crimp-connected to the crimp portion (). The crimp portions () located at opposite sides with respect to the lateral direction face the side surface () of the sensor element (), whereas the crimp portion () faces away from the side surface () of the sensor element ().

A sensor including a sensor element including a plurality of electrode terminals, terminal metal fittings, a terminal surrounding member, and lead wires connected to respective terminal metal fittings. The terminal surrounding member is divided into a front side surrounding member and a rear side surrounding member in the front-rear direction, and a rear end face of the front side surrounding member abuts a front end face of the rear side surrounding member. At least one of the terminal metal fittings includes a protruding piece portion protruding in a lateral direction and held between the rear end face of the front side surrounding member and the front end face of the rear side surrounding member.

A sensor including: a detecting element () as defined herein; a plurality of metallic terminal members () as defined herein; and an insulating separator () as defined herein, wherein the insulating separator includes: an outer separator () which surrounds the electrode terminal portions of the detecting element and the metallic terminal members; and an inner separator () at least a portion of which is disposed radially inwardly of the outer separator and which has partition walls () for positioning the plurality of metallic terminal members and insulating the plurality of metallic terminal members from one another.

A high temperature sensor allowing for accurate measurement including wires running through an oxygen ion conductor and connecting to electrodes sandwiching an oxygen ion conductor substrate having an electrical resistance far smaller than the combined resistance (Rpvs) appearing across the lead wires, where Rpvs is determined by way of a pulse voltage sensing method applied across the electrodes. In the case of a two cavity sensor for NOx measurement, Rpvs is not less than 2.6 times greater, or more preferably 4 times greater than the resistance of the wires. In another embodiment, a common internal oxygen reference source cavity is formed inside the oxygen ion conductor so as to provide the same oxygen partial pressure base for other cavities.

Growing community of inventors

Iwakura, Japan

Noboru Matsui