Title:
グロープラグ
Document Type and Number:
Japanese Patent JP6781599
Kind Code:
B2
Abstract:
[Object] To provide a glow plug including a sheath tube whose resistance to oxidation can be maintained by reducing the occurrence of cracks in a melted portion of the sheath tube when the sheath tube is formed of a specific material. [Solution] A glow plug 10 includes a sheath tube 810 and a heating coil 820. The sheath tube 810 is made of an alloy containing 50% or more by weight of Ni, 18 to 30% by weight of Cr, 1% or less by weight of Al, and 0.01 to 0.3% by weight of at least one component selected from Y and Zr. A main component of the heating coil 820 is tungsten (W) or molybdenum (Mo). A front end portion 822 of the heating coil 820 is embedded in a melted portion 816 of the sheath tube 810 and is not exposed at an outer surface of the sheath tube 810. When a is a maximum value of a length of the melted portion 816 in an axial line direction OD and b is a maximum value of a length of the melted portion 816 in a direction perpendicular to the axial line direction OD, 0.46 ‰¤ a/b is satisfied.
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Inventors:
Sugiyama Yumi
Hirofumi Okada
Hirofumi Okada
Application Number:
JP2016187459A
Publication Date:
November 04, 2020
Filing Date:
September 26, 2016
Export Citation:
Assignee:
Nippon Special Ceramics Co., Ltd.
International Classes:
F23Q7/00; H05B3/10; H05B3/48
Domestic Patent References:
| JP2015198018A | ||||
| JP2015155790A | ||||
| JP2001330249A | ||||
| JP2015117930A |
Foreign References:
| DE102013212283A1 |
Attorney, Agent or Firm:
Hiroki Nakajima