US 11,835,439 B2
Sensor device having an element cover including inner and outer covers
Yuto Tamei, Kariya (JP); Koichi Yoshida, Kariya (JP); and Takehito Kimata, Kariya (JP)
Assigned to DENSO CORPORATION, Kariya (JP)
Filed by DENSO CORPORATION, Kariya (JP)
Filed on Aug. 20, 2021, as Appl. No. 17/407,284.
Application 17/407,284 is a continuation of application No. PCT/JP2020/003163, filed on Jan. 29, 2020.
Claims priority of application No. 2019-029816 (JP), filed on Feb. 21, 2019.
Prior Publication US 2021/0381945 A1, Dec. 9, 2021
Int. Cl. G01N 15/06 (2006.01); G01M 15/10 (2006.01)
CPC G01N 15/0656 (2013.01) [G01M 15/102 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A sensor device comprising:
a sensor element having a detector for detecting a specific component in a gas under measurement,
a housing having the sensor element inserted into the interior thereof, and retained with a detector positioned at a first tip end of the sensor element with respect to the axial direction, and
an element cover disposed at a first tip end of the housing coaxially,
with the element cover comprising an inner cover disposed such as to cover the first tip end of the sensor element and an outer cover disposed with a space between the outer cover and the outer periphery of the inner cover, wherein
an inner side hole and an inner tip surface hole, through which the gas under measurement circulates, are provided in a side surface and a tip surface respectively of the inner cover;
a plurality of outer side holes, through which the gas under measurement circulates, are provided in a side surface of the outer cover, with tip positions of the outer side holes being located farther toward a first tip end of the sensor device than is a tip position of the inner cover;
a plurality of outer tip surface holes are provided in a tip surface of the outer cover, located farther radially outward than positions facing the outer periphery of the inner tip surface hole;
in the tip surface of the outer cover, a central portion, which faces the inner tip surface hole, protrudes towards the inner tip surface hole, an outer peripheral portion, in which the outer tip surface holes are formed, is positioned farther toward the first tip end of the sensor device than is the central portion, and an inclined surface connects the central portion to the outer tip surface holes; and
the side surface on a tip side of the inner cover is tapered, and on the outer periphery of the side surface on the tip side of the inner cover, a clearance between the inner cover and the outer cover becomes smaller from the tip side toward a base end of the inner cover.