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Patent Searching and Data


Title:
IGNITION PLUG
Document Type and Number:
WIPO Patent Application WO/2017/104097
Kind Code:
A1
Abstract:
The present invention prevents a ground electrode chip from falling off a ground electrode base material. This ignition plug is provided with: a center electrode; a ground electrode base material which has a first surface and a second surface, and which has a through-hole penetrating from the first surface to the second surface; a ground electrode chip which has an electric discharge surface and a large-diameter surface being the backside of the electric discharge surface, and a part of which, including the large-diameter surface, is disposed within the through-hole, while the electric discharge surface is exposed out of the through-hole toward the center electrode side; and a fixing member which, when the direction pointing from the large-diameter surface to the electric discharge surface is defined as a first direction, while the direction opposite thereto is defined as a second direction, is disposed at a portion on the second direction side of the large-diameter surface in the through-hole. The maximum length in the first direction of the portion of the fixing member disposed within the through-hole lies so as to pass through the central axis of the fixing member. In a cross-section along the first direction, the length in the first direction to the second surface from an end in the first direction of a welding part at the boundary between the ground electrode base material and the fixing member is at least 50% of the maximum length in the first direction of the portion of the fixing member disposed within the through-hole.

Inventors:
HASEGAWA YUKINOBU (JP)
SAKAKURA YASUSHI (JP)
Application Number:
PCT/JP2016/004542
Publication Date:
June 22, 2017
Filing Date:
October 11, 2016
Export Citation:
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Assignee:
NGK SPARK PLUG CO (JP)
International Classes:
H01T13/32; H01T13/39
Foreign References:
JPS62268079A1987-11-20
JPS5940482A1984-03-06
Attorney, Agent or Firm:
AOKI, Noboru et al. (JP)
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