Ngk Spark Plug Company, Limited

Masahiko Nishi

Go Hanzawa

Takaaki Chosokabe

Masaki Iwaya

Hitoshi Yokoi

Masamichi Ito

Masaru Hayakawa

In a temperature sensor (), a pair of electrode wires () of a thermistor element () are formed of a material prepared by adding strontium to platinum or a platinum alloy and without addition of zirconia or a like oxide. Rear end portions of the electrode wires () formed of the above-mentioned material and front end portions of sheath core wires () are laser-welded to one another in an overlapping condition.

Temperature sensor

A temperature sensorincludes a metallic cover, a thermistor elementaccommodated in a front portionof the metallic cover, first and second conductive wiresandextending rearwards of the thermistor elementand transmitting a signal therefrom, a MI cablein which first and second core wiresandare positioned and having a front end thereof inserted into the metallic cover, and an insulating holdersituated between the thermistor elementand the front end of the MI cablein the metallic cover. The insulating holderholds the first and second conductive wiresandand corresponding first and second core wiresand, respectively. The conductive wires and the corresponding core wires are connected to each other in the insulating holder. Furthermore, the thermistor elementand the insulating holderare fixed by means of cement

Temperature sensor and method for producing the same

A temperature sensor comprising: a flange having a bore and mounted on a fluid pipe having a fluid flow, to prevent said fluid from leaking out; an MI cable formed to have metallic cores insulated and retained on a metallic outer cylinder, and fixed in such a mode in said bore that a leading end side of said MI cable protrudes from a leading end side of said flange and extends in an axial direction; a metallic cap fixed on a leading end side outer circumference of said MI cable and having fluid communication ports for allowing said fluid to flow therein; and a temperature sensing element including: a ceramic substrate housed in said cap; a sensing portion formed over said ceramic substrate and having electric characteristics varied with a temperature of said fluid; and a wiring portion for connecting said sensing portion and said metallic cores of said MI cable electrically.

A temperature sensor () including a cylindrical metal tube () having a front end side blocked, a thermistor element (), and a sheath member () connected to the thermistor element () and held in the inside of the metal tube (), wherein: the metal tube () has a small-diameter portion () located on the front end side and entirely having an inner diameter smaller than the outer diameter of the sheath member (), and a large-diameter portion () located on the rear end side of the small-diameter portion () and having a diameter larger than the outer diameter of the small-diameter portion (); and a thermistor sintered body () is held in the small-diameter portion () and cement () is filled in between a front end of the thermistor sintered body () and a front end of an inner wall of the metal tube () and on the front end side viewed from a rear end surface of the thermistor sintered body ().

Temperature sensor with quick response

A temperature sensor comprising: a housing; a thermo-sensitive element housed in the housing for outputting electric characteristics varying with a temperature, as an electric signal; and a pair of lead wires connected at their one-side ends with the thermo-sensitive element for extracting the electric signal from the thermo-sensitive element to an outside of the housing, wherein at least one of the lead wires is made of a mixed twisted wire including: first electric wires made of a first conductor containing copper; and second electric wires made of a second conductor having a higher bending resistance and a tensile strength than those of the first conductor.

A cylindrical metal tube () accommodating therein a thermistor device (), the electric characteristics of which change with temperature, is pushed into, or clamped and fixed to, a sheath portion () positioned on a flange () to the rear of a projection portion () of the flange (), and is laser welded in a circumferential direction. A weld portion (L) formed to bridge the metal tube () and the sheath portion () of the flange () firmly fixes the metal tube () to the flange (). In the temperature sensor () having this construction, the weld portion (L) between the metal tube () and the flange () is not exposed to a high temperature environment. Therefore, oxidation hardly occurs at the weld portion and reliability of air tightness to an exhaust gas can be improved.

Growing community of inventors

Aichi, Japan

Masahiko Nishi