GAS SENSOR AND METHOD OF PRODUCING THE SAME

摘要

The amount of use of a seal member for maintaining air-tightness between a sensor's metallic-member body and element is reduced, sealing capability is enhanced, and the sensor is made shorter and smaller in size. In a gas sensor, a detection element (15) is positioned in a metallic-member body (2), an electrode layer on an outer peripheral surface is electrically connected, and a terminal member (31) is inserted in the element (15) so as to be electrically connected to an electrode layer on an inner peripheral surface. In order to retain a seal member (21), located between the metallic-member body (2) and the detection element (15), by compressing it toward the head side by a ceramic sleeve (25) having a flange (28), the seal member (21) is positioned more on the head side than rear ends (2b, 15c) of the metallic-member body and the detection element, respectively. Further, a sleeve head (26) is positioned more on the head side than a rear end (15c) of the detection element and compresses the seal member (21). The seal member (21) does not straddle on the terminal member in the axis (G) direction differently from conventional products, and this enables the amount of the seal member to be reduced.