Patent ID: 6997607
Filing Date: 2006-02-14
Classification: G01K

Abstract:
1. A temperature sensor including: a cylindrical metal tube having a distal end thereof closed and extending in an axial direction; a device accommodated in said metal tube and having electric characteristics thereof changing in accordance with temperature; and a flange encompassing an outer peripheral surface of said metal tube; wherein said flange includes a sheath portion extending in the axial direction and a projection portion positioned on a distal end side of said sheath portion and protruding outward in a diametric direction, said projection portion having a seat surface at a distal end thereof, said metal tube is pushed into, or clamped and fixed to, at least said sheath portion, and said metal tube and said sheath portion are welded in a circumferential direction rearward of said seat surface; said temperature sensor further including a sheath member having built-in metal core wires having said device connected to a distal end side thereof and lead wires for connecting an external circuit, connected to a rear end side thereof, and a cylindrical joint bonded air-tight outside said sheath portion of said flange in the diametric direction and extending rearward in the axial direction, wherein the distal end side of said sheath member is inserted into said metal tube, and the rear end side of said metal tube and the distal end side of said lead wires are arranged inside said joint; and wherein said sheath portion has a two-step shape including a distal end step portion positioned on a distal end side and a rear end step portion having an outer diameter smaller than that of said distal end step portion, said metal tube is welded to said rear end step portion of said sheath portion and said joint is bonded to an outer peripheral surface of said distal end step portion in a circumferential direction.