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US 2020/0049653 A1Published application
Gas sensor
AssigneeDenso Corporation
InventorsMakoto NAKAE, Shota IMADA
Life of this patent
Estimating the term…
Abstract
A gas sensor includes a sensor element, and the sensor element includes a bottomed tubular solid electrolyte, a detection electrode provided on an outer surface of the solid electrolyte, a reference electrode provided on an inner surface of the solid electrolyte. The detection electrode of the sensor element includes a detection electrode section provided at a position on a tip side of an axial direction, an attachment electrode section provided at a position on a base end side of the axial direction, and a lead electrode section provided at a position where the detection electrode section is connected to the attachment electrode section. An insulating layer is provided between a tube of the solid electrolyte and each of the attachment electrode section and the lead electrode section.
Claims9
A gas sensor comprising a sensor element, wherein:
- the sensor element includes
- a solid electrolyte that has a bottomed tubular shape and in which a tip portion of a tube having a tubular shape thereof is blocked by a bottom having a curved surface,
- a detection electrode that is provided at least on an outer surface of the tube and is exposed to detection gas guided to an outside of the solid electrolyte, and
- a reference electrode that is provided at least on an inner surface of the tube and is exposed to reference gas guided to an inside of the solid electrolyte;
- the detection electrode includes
- a detection electrode section that is provided on an entire periphery or a part in a circumferential direction around a center axis of the tube at a position on a tip side of an axial direction along the center axis,
- an attachment electrode section that is provided on an entire periphery or a part in the circumferential direction of the tube at a position on a base end side of the axial direction and is in contact with a terminal metal fitting attached to an outer periphery of the tube, and
- a lead electrode section that is provided on a part in the circumferential direction of the tube at a position where the detection electrode section is connected to the attachment electrode section and that is formed in a formation region in the circumferential direction smaller than a formation region in the circumferential direction of the attachment electrode section;
- an insulating layer that insulates the solid electrolyte from the attachment electrode section and the lead electrode section is provided between the tube of the solid electrolyte and each of the attachment electrode section and the lead electrode section;
- and
- the tube has a part where the outer surface of the tube is exposed, at the end of the base end side of the axial direction.
8 more elements
A gas sensor comprising a sensor element, wherein:
- the sensor element includes
- a solid electrolyte that has a bottomed tubular shape and in which a tip portion of a tube having a tubular shape thereof is blocked by a bottom having a curved surface,
- a detection electrode that is provided at least on an outer surface of the tube and is exposed to detection gas guided to an outside of the solid electrolyte, and
- a reference electrode that is provided at least on an inner surface of the tube and is exposed to reference gas guided to an inside of the solid electrolyte;
- the detection electrode includes
- a detection electrode section that is provided on an entire periphery or a part in a circumferential direction around a center axis of the tube at a position on a tip side of an axial direction along the center axis,
- an attachment electrode section that is provided on an entire periphery or a part in the circumferential direction of the tube at a position on a base end side of the axial direction and is in contact with a terminal metal fitting attached to an outer periphery of the tube, and
- a lead electrode section that is provided on a part in the circumferential direction of the tube at a position where the detection electrode section is connected to the attachment electrode section and that is formed in a formation region in the circumferential direction smaller than a formation region in the circumferential direction of the attachment electrode section;
- and
- an insulating layer that insulates the solid electrolyte from the attachment electrode section and the lead electrode section is provided between the tube of the solid electrolyte and each of the attachment electrode section and the lead electrode section;
- an end on the base end side of the axial direction of the insulating layer is provided on the base end side of an end on the base end side of the axial direction of the attachment electrode section, is exposed on the outer surface of the tube, and has a tapered surface;
- and
- a thickness in a radial direction from the center axis of the tapered surface is reduced toward the base end side of the axial direction of the tube so that the terminal metal fitting attached to the outer periphery of the tube is guided from the base end side toward the tip side of the axial direction of the tube.
10 more elements
A gas sensor comprising a sensor element, wherein:
- the sensor element includes
- a solid electrolyte that has a bottomed tubular shape and in which a tip portion of a tube having a tubular shape thereof is blocked by a bottom having a curved surface,
- a detection electrode that is provided at least on an outer surface of the tube and is exposed to detection gas guided to an outside of the solid electrolyte, and
- a reference electrode that is provided at least on an inner surface of the tube and is exposed to reference gas guided to an inside of the solid electrolyte;
- the detection electrode includes
- a detection electrode section that is provided on an entire periphery or a part in a circumferential direction around a center axis of the tube at a position on a tip side of an axial direction along the center axis,
- an attachment electrode section that is provided on an entire periphery or a part in the circumferential direction of the tube at a position on a base end side of the axial direction and is in contact with a terminal metal fitting attached to an outer periphery of the tube, and
- a lead electrode section that is provided on a part in the circumferential direction of the tube at a position where the detection electrode section is connected to the attachment electrode section and that is formed in a formation region in the circumferential direction smaller than a formation region in the circumferential direction of the attachment electrode section;
- an insulating layer that insulates the solid electrolyte from the attachment electrode section and the lead electrode section is provided between the tube of the solid electrolyte and each of the attachment electrode section and the lead electrode section;
- an end on the base end side of the axial direction of the insulating layer is provided so as to be continuous from the outer surface of the tube to an end surface on the base end side of the tube;
- and
- corner portion of the insulating layer located at a corner portion on the base end side of the tube has a curved surface.
9 more elements
Dependencies are inferred from the claim text.