Gas sensor
AssigneeDenso Corporation
InventorsTakashi ARAKI, Mitsunobu NAKATO
Life of this patent
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Abstract
Provided is a gas sensor achieving improvement in detection accuracy for a specific gas component and responsiveness for detecting the specific gas component. A guide body is provided at a base end section of a first inner circulation hole in an inner cover of the gas sensor. The base end section is located between a base end position P1 2 mm away from a tip end of a sensor element in an axial direction L towards a base end side L1 and a tip end position P2 2 mm away from the tip end towards a tip end side L2. The tip end is on the base end side L1 relative to an imaginary line K passing through a base end and a tip end on a surface on the tip end side of the guide body.
Claims9
A gas sensor comprising:
- a sensor element which includes a detection section for detecting a specific gas component in measured gas;
- a housing into which the sensor element is inserted and held;
- an inner cover which has a side wall section and a bottom section which cover the detection section which is mounted at a tip end of the housing and protrudes from the housing, the side wall section having a first inner circulation hole, the bottom section having a second inner circulation hole;
- and
- an outer cover which has a side wall section and a bottom section which cover the inner cover, the side wall section having a first outer circulation hole, the bottom section having a second outer circulation hole, wherein
- when in an axial direction in which the sensor element is inserted into the housing, a tip end side is a side on which the inner cover is provided relative to the housing and a base end side is a side opposite to the tip end side,
- a guide body which protrudes towards an inner peripheral side being provided at a base end section of the first inner circulation hole,
- the base end section of the first inner circulation hole being located between a base end position and a tip end position, the base end position being a position obtained by projecting, on the inner cover in a direction perpendicular to the axial direction, a position which is 2 mm away from a tip end of the sensor element in the axial direction towards the base end side, the tip end position being a position obtained by projecting, on the inner cover in the direction perpendicular to the axial direction, a position which is 2 mm away from the tip end of the sensor element in the axial direction towards the tip end side,
- the tip end of the sensor element in the axial direction being located at a position where an imaginary line intersects with the tip end or a position which is on the base end side in the axial direction relative to the imaginary line, the imaginary line passing through a base end and a tip end on a surface on the tip end side of the guide body.
Dependencies are inferred from the claim text.