Ngk Spark Plug Company, Limited

Masaaki Murase

Wataru Matsutani

Junichi Kagawa

Hiroshi Miyata

Makoto Kuribayashi

Ryoji Tanimura

Etsuya Ikeda

Yosuke Yatsuya

Nobuo Kawai

Takashi Mizukusa

Shinichi Nakamura

A fuel cell with separator includes a fuel cell body having a cathode, an anode, and a solid electrolyte layer disposed between the cathode and the anode; a plate-like metal separator having first and second main surfaces and an opening which opens at the first and second main surfaces; a joint formed of an Ag-containing brazing filler metal and adapted to join the fuel cell body and the first main surface of the metal separator; and a seal formed of a glass-containing sealing material and disposed closer to the opening than is the joint, the seal being located between the first main surface and the fuel cell body and extending along the entire perimeter of the opening.

Fuel cell with separator, method for manufacturing same, and fuel cell stack

A gas sensor including an element for measuring the concentration of a gas to be detected which is contained in a gas under measurement; a protector provided to cover a tip end of the element in the axial direction; and a protection cap removably attached to the gas sensor. The protection cap includes a tubular portion which surrounds a side surface of the protector , support portions which project from an inner surface of the tubular portion and reach the side surface of the protector without axially partitioning the space between the inner surface of the tubular portion and the side surface of the protector , and an air-outlet hole for establishing communication between the interior and exterior of the protection cap

Gas sensor having protector and protection cap

A gas sensor includes a casing which covers a sensing element and includes two cylindrical members. The cylindrical members are axially disposed in such a manner as to overlap each other. Examples of the cylindrical members are a protector (outer member) and a protector attachment portion (inner member) of a metallic shell . A diameter-reduced portion is circumferentially formed on the outer member through, for example, caulking. A weld zone is circumferentially formed at the diameter-reduced portion so as to weld the outer member onto the inner member . Through formation of the diameter-reduced portion , a gap between the outer member and the inner member as measured at the position of the weld zone is reduced, thereby improving adhesion therebetween. As a result, possibility of a weld defect arising can be suppressed. Further, attainment of a good welded state does not require the practice of dimensional control of the inner and outer members; particularly, strict dimensional control of the difference between the bore diameter of the outer member and the outside diameter of the inner member. Hence, production efficiency or yield of gas sensors is improved.

Gas sensor and method for manufacturing the same

In a multi-gap type spark plug for an internal combustion engine, the spark plug has a cylindrical metallic shell into which a tubular ceramic insulator is enclosed. The insulator has a tapered front leg portion, a front end of which extends beyond that of the metallic shell. A center electrode is enclosed into the insulator, having at a front end thereof, a filing tip extending beyond that of the insulator. A plurality of L-shaped outer electrodes each having a vertical piece and lateral piece, the vertical piece depending from the front end of the metallic shell to surround the front end of the insulator, while the lateral piece having an inner surface arranged in parallel with a front end surface of the insulator, and having an end tip terminated to oppose an outer surface of the firing tip through a spark gap established therebetween. A vertical distance between the front end surface of the insulator and the inner surface of the lateral piece of each outer electrode is determined to be within a dimension ranging from 0.3 mm to 1.2 mm.

Multi-gap spark plug for an internal combustion engine

Growing community of inventors

Aichi, Japan

Masaaki Murase