{
  "$type": "site.standard.document",
  "description": "There is provided a glow plug which can be attached to a plurality of types of internal combustion engines that differ from one another in terms of the taper angle of a tapered seat surface of each attachment hole, which can be manufactured from a housing of a single type without preparing a…",
  "path": "/patents/978403",
  "publishedAt": "2014-02-19T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F02P19/00",
    "NGK SPARK PLUG CO [JP]"
  ],
  "textContent": "There is provided a glow plug which can be attached to a plurality of types of internal combustion engines that differ from one another in terms of the taper angle of a tapered seat surface of each attachment hole, which can be manufactured from a housing of a single type without preparing a plurality of types of housings, and which allows common use of components. A metallic shell 2 of a glow plug 1 has a forward end portion 20 having an outer peripheral surface whose diameter increases toward the rear end side with respect to the axial direction, the forward end portion 20 coming into contact with a seat surface 55 formed on an internal combustion engine 50 when the glow plug 1 is attached to an attachment hole 51 provided in the internal combustion engine 50. The outer peripheral surface of the forward end portion 20 includes a first contact surface 21, a second contact surface 22, and a third contact surface 23 which differ in imaginary line angle from one another, the imaginary line angle of each contact surface being an angle which is formed, as viewed on a cross section including an axis C 1 , between two straight imaginary lines connecting inflection points of the contact surface at opposite ends of the contact surface. The first contact surface 21, the second contact surface 22, and the third contact surface 23 are curved surfaces which bulge outward.",
  "title": "GLOW PLUG"
}