Glow plug with built-in combustion pressure sensor and...

Electric heating – Heating devices – Resistive element: igniter type

Reexamination Certificate

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Details

C123S14500A

Reexamination Certificate

active

06979801

ABSTRACT:
A glow plug includes a cylindrical housing having an inward protrusion extending radially inwardly, a threaded portion for screwing the glow plug in an engine plug hole and a sealing portion in a front side of the male threaded portion for airtightly engaging the housing with a given portion of the plug hole, a sheath having a rear sheath end portion airtightly fixed in the housing, a heater disposed in the sheath, a center electrode disposed in the housing and having a front electrode end portion electronically connected with the heater and mechanically connected with the sheath and an outward protrusion protruding radially outwardly, and a combustion pressure sensor having a pressure-sensitive element arranged between a front surface of the inward protrusion and a rear surface of the outward protrusion to generate an electrical signal in response to variations in stress applied thereto.

REFERENCES:
patent: 4914751 (1990-04-01), Masaka et al.
patent: 5146881 (1992-09-01), Pfefferle
patent: 5922229 (1999-07-01), Kurano
patent: 6756722 (2004-06-01), Hiramatsu
patent: 2002/0195917 (2002-12-01), Hiramatsu
patent: 59-60237 (1984-04-01), None
patent: 59-85932 (1984-05-01), None
patent: 59085932 (1984-05-01), None
patent: 7-139736 (1995-05-01), None
patent: 2002-327919 (2002-11-01), None

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