Temperature sensor

Patent metadata

Field	Value
Publication number	US-10422701-B2
Application number	US-201615563706-A
Country	US
Kind code	B2
Filing date	Apr 1, 2016
Priority date	Apr 3, 2015
Publication date	Sep 24, 2019
Grant date	Sep 24, 2019

Abstract

A temperature sensor includes a temperature detector, an element electrode wire, a lead wire, and an intermediate member. Each of the lead wire and the intermediate member is made of a Ni-based alloy or an Fe-based alloy. The element electrode wire and the intermediate member are welded together in such a manner that opposing surfaces, facing each other abut against each other to constitute an element-side weld. The intermediate member and the lead wire are welded together such that they overlap each other in a longitudinal direction Z to constitute a lead-side weld. The lead wire is extended closer to the temperature detector than the element-side weld is located. A gap between the element electrode wire and the lead wire at least in the longitudinal direction Z is filled with a filler. The element electrode wire, the element-side weld, and the lead wire are fixed to one another by the filler.

First claim

The invention claimed is:

1. A temperature sensor comprising:
a temperature detector including a temperature-sensing element for detecting temperature;
a pair of element electrode wires each made of a noble metal or a noble metal alloy, one end being buried in the temperature detector, another end being extended in a same direction as that of the other element electrode wire;
a pair of lead wires each made of a Ni-based alloy or an Fe-based alloy, electrically connected to the element electrode wire, and formed to extend in an extending direction of the element electrode wire; and
a pair of intermediate members each made of a Ni-based alloy or an Fe-based alloy, configured to electrically connect the element electrode wire to the lead wire, and formed to extend in the extending direction, wherein
the element electrode wire and the intermediate member are provided in a line with each other in the extending direction, and welded together in such a manner that opposing surfaces facing each other abut against each other to constitute an element-side weld,
the intermediate member and the lead wire are provided adjacent to each other in a direction orthogonal to the extending direction, and welded together such that the intermediate member and the lead wire overlap each other to constitute a lead-side weld,
the lead wire is extended closer to the temperature detector than the element-side weld is located,
a gap between the element electrode wire and the lead wire at least in the direction orthogonal to the extending direction is filled with a filler, and
the element electrode wire, the element-side weld, and the lead wire are fixed to one another by the filler.

2. The temperature sensor according to claim 1 , wherein
a shortest distance L in the extending direction between the element-side weld and the lead-side weld is equal to or greater than 0.1 mm.

3. The temperature sensor according to claim 2 , wherein
the shortest distance L is equal to or greater than 0.2 mm.

4. The temperature sensor according to claim 1 , wherein
a length dimension D of the element electrode wire in the extending direction from the temperature detector to a portion projecting toward the lead wire is equal to or greater than 0.1 mm.

5. The temperature sensor according to claim 4 , wherein
the length dimension D is equal to or greater than 0.2 mm.

6. The temperature sensor according to claim 1 , wherein
the element electrode wire is made of Pt, a Pt-based alloy containing at least one of Ir, Rh, and Sr, or dispersion-strengthened Pt containing both metallic particles including Pt and oxide particles dispersed among the metallic particles.

7. The temperature sensor according to claim 1 , wherein
the temperature detector is housed in a cover member that covers the temperature detector from a distal end side and an outer peripheral side, and the temperature detector and the cover member are fixed to each other by the filler filled inside the cover member.

8. The temperature sensor according to claim 1 , wherein
a sectional area of a section of the filler orthogonal to the extending direction at a portion where the element electrode wire overlaps the lead wire in the direction orthogonal to the extending direction is equal to that at another portion where the intermediate member overlaps the lead wire in the direction orthogonal to the extending direction.

Assignees

• Denso Corp

Inventors

• Ozeki Toshiya
• Yoshida Koichi
• Sato Motoki
• Hironaka Masaki

Classifications

• G01K7/22

  the element being a non-linear resistance, e.g. thermistor (G01K7/26 takes precedence) · CPC title

• G01N27/4062

  Electrical connectors associated therewith · CPC title

• G01K1/08 Primary

  Protective devices, e.g. casings · CPC title

• G01K1/12

  for preventing damage due to heat overloading · CPC title

• G01K2205/04

  for measuring exhaust gas temperature · CPC title