Ngk Spark Plug Company, Limited

Niterra Co., Ltd.

Daisuke Matsuyama

Masashi Nomura

Yuto Inose

Masahiro Asai

Takehiro Oba

Masana Okai

Kunihiko Yonezu

A gas sensor () including a sensor element () having electrode pads (-); a separator (); and a plurality of metal terminals () each having a body portion () and a front end portion (), and being insulated from each other by the separator. The separator has an element storage portion () penetrating in the axial-line direction or recessed toward a rear side from a front facing surface of the separator, the element storage portion has a first storage space () at a front side thereof and a second storage space () at a rear side thereof, the second storage space has a rotation restriction wall () configured such that a relative rotation allowable angle 2θ between the sensor element and the separator is smaller than in the first storage space, and the rear end side of the sensor element is stored in the second storage space.

Gas sensor

A gas sensor includes a gas sensor element for detecting the concentration of a specific gas in a gas under measurement, a tubular housing having an opening, a sealing member closing the opening, and a heat dissipating member having a rear end located at the same position or forward of the rear end of the housing. The heat dissipating member reduces heat transferred from the forward end side of the gas sensor to the sealing member and includes a connection portion connected to the housing, and a main portion extending rearward from the connection portion such that a gap is formed between the main portion and the housing. The main portion has heat dissipating openings for establishing communication between the gap and a space on the outer circumferential side of the heat dissipating member. The heat dissipating openings are formed on the rear end side of the main portion.

A gas sensor () extending in an axial direction AX including: a gas sensor element () which detects the concentration of a specific gas in a gas under measurement; a tubular metallic shell () having a polygonal tool engagement portion (B) surrounding the gas sensor element (); a tubular outer tube () which extends rearward from the metallic shell (), surrounds the gas sensor element (), and has an opening (E) at a rear end thereof; a sealing member () which seals the opening (E); and a tubular heat dissipating member () which surrounds the outer tube () and reduces the amount of heat transferred from the forward end side of the gas sensor () through the outer tube () to the sealing member (). The maximum diameter Dof the heat dissipating member () is equal to or less than the opposite side dimension Dof the tool engagement portion (B).

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Nagoya, Japan

Daisuke Matsuyama