Gas sensor.

摘要

An oxygen sensor comprises a planar sensor element (12) which generates electromotive forces or varies an electric resistance between electrodes formed on opposite surfaces of the planar sensor element depending upon concentrations of oxygen in exhaust gases, a metallic housing member (10) for housing the sensor element therein, a ceramic powder (30) placed around the planar sensor element in the metallic housing member and adapted to fix the planar sensor element and form a gas-seal section and ceramic supporters (28) for compacting the powder under a given pressure therebetween. In order to reduce loosening of the powder (30) by vibration, a portion of at least one of the ceramic supports (28) which contacts the ceramic powder is provided with a projection (16).