GLOW PLUG WITH PRESSURE SENSOR

摘要

A glow plug (100) includes: a housing (130) having a metal shell (110) and a cap unit (120); and a heater unit (150). A coupling member (180) is joined with the housing (130) and is also joined with the heater unit (150) at its edge portion (188), so as to enable the heater unit (150) to move along an axis line O and couple the heater unit (150) with the housing (130). When the edge portion 188 of the coupling member 180 is irradiated with a laser, at least part of the edge portion (188) melted by laser welding fills a gap (50) between the coupling member (180) and the heater unit (150) to form a welded part (210). As a result, even when there is a gap prior to welding, the weld strength between the coupling member (180) and the heater unit (150) can be maintained.

主权项

1. A glow plug with a pressure sensor comprising:
a housing in a cylindrical shape that is extended in a direction of an axis line; a heater unit in a rod shape that has a rear end part placed in the housing and a front end part protruded from a front end of the housing and is movable along the direction of the axis line; a coupling member in a thin film shape that enables the heater unit to move along the direction of the axis line and couples the heater unit with the housing; and a pressure sensor that detects a pressure based on a load transmitted via the heater unit, wherein an edge portion of the coupling member and the heater unit are joined together by laser welding performed from a coupling member side, a portion of the coupling member other than the edge portion is arranged to face the heater unit with a gap therebetween, and the edge portion of the coupling member is joined with the heater unit via a welded part formed by melting at least part of the edge portion of the coupling member by the laser welding.