Denso Corporation

Nippondenso Co., Ltd.

Masaru Yamada

Satoshi Nakamura

Daisuke Makino

Hidetaka Hayashi

Hiroo Imamura

Kengo Toguchi

Masayuki Hiroshima

A gas sensor has a housing, a gas sensing element held by the housing and having a gas contact portion and an element cover for covering the gas contact portion. The element cover has a double pipe structure formed by layering an outer pipe and an inner pipe. The outer pipe has an outer bottom portion having an outer bottom hole and an outer side portion having plural outer side holes. The inner pipe has an inner bottom portion having an inner bottom hole and an inner side portion having plural inner side holes disposed not to overlap the outer side holes. A spacing D of 0.2-1.0 mm is formed between the outer bottom portion and the inner bottom portion. As a result, flow resistance in the spacing D is relatively high, and the sample gas sufficiently and more smoothly flows toward the gas sensing element. Therefore, the element cover prevents condensed water from entering the inside of the gas sensor and improves response of the gas sensor.

Gas sensor for vehicle engine having a double-pipe cover

According to the present invention, an oxygen concentration detector includes a housing, a detecting element inserted into said housing and a cover for covering a top portion of said detecting element. The detecting element is made of solid electrolyte and includes an atmospheric chamber therein. The cover includes an air vent portion for introducing air into said atmospheric chamber of the detecting element. The detecting element includes an air introducing path open to the atmospheric chamber at a side wall of the detecting element. It is possible to provide an oxygen concentration detector capable of introducing the air into the atmospheric chamber and maintaining an oxygen concentration in the atmospheric chamber at the same level as an atmosphere constantly.

Oxygen concentration detector

Growing community of inventors

Tokoname, Japan

Masaru Yamada