Title:
スパークプラグ
Document Type and Number:
Japanese Patent JP4965692
Kind Code:
B2
Abstract:
A spark plug including an insulator (2) having an axial hole (6) in an axial direction of the spark plug; a center electrode (3) disposed in a tip end side of the axial hole (6) of the insulator (2); a metal shell (1) surrounding the insulator (2); a first ground electrode (4) including a first ground electrode body having body having one end joined to the metal shell (1), and a noble metal tip (41) joined to an inner side face of another end portion of the first ground electrode body and disposed opposite a tip end face of the center electrode (3) across a first discharge gap (g1). One end of a second ground electrode (5) is bonded to the metal shell (1), and the another end is disposed opposite a side peripheral face of said center electrode (3) or a side peripheral face of said insulator (2) across a second discharge gap (g2). Furthermore, the spark plug is characterized as having a distance t and an included angle θ as defined herein.
Inventors:
Kato Tomoaki
Application Number:
JP2010128136A
Publication Date:
July 04, 2012
Filing Date:
June 03, 2010
Export Citation:
Assignee:
Nippon Special Ceramics Co., Ltd.
International Classes:
H01T13/20; F02P13/00; H01T13/32; H01T13/46
Domestic Patent References:
| JP2002313524A | ||||
| JP2002324650A | ||||
| JP2002184551A | ||||
| JP2002231414A | ||||
| JP2001237045A |
Attorney, Agent or Firm:
Aoki Noboru