Denso Corporation

Yota Iwamoto

Yasufumi Suzuki

A gas sensor includes a sensor element having a detection section at a distal end portion thereof, and an element cover that surrounds a periphery of the sensor element. The sensor element includes electrodes and formed on a surface of a solid electrolyte body, a heater, and a porous protective layer formed on an outside of the detection section. The element cover includes a cover member with gas flow holes on a side surface and a gas passage is formed between the cover member and the sensor element. A distance between the cover member and the side surface of the sensor element in a direction perpendicular to an axis of the sensor element is in a range of 0.2 mm to 0.8 mm in the entire region of the gas passage leading from the gas flow holes to the detecting section.

Gas sensor

A gas sensor element with excellent sensor output reliability and durability and a manufacturing method thereof is provided. The gas sensor element is provided with an oxygen-ion conductive solid electrolyte body, a measuring electrode and a reference electrode provided respectively on surface and another surface of the solid electrolyte body, a signal lead partconnected to the measuring electrode, which also extends to a base end side thereof, a first ceramic layer covering the signal lead part from an opposing side to the solid electrolyte body, and a second ceramic layer intervening between the signal lead part and the solid electrolyte body. The signal lead part is formed from one metal or an alloy of more than one metal selected from a group consisting of Pt, Au, Ag, Pd, Rh, Ni and Ir. On the second ceramic layer, a dyeing section which is the metal or an alloy of more than one metal dyed thereon, is formed from the signal lead part side.

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Kariya, Japan

Yota Iwamoto