METHOD FOR MANUFACTURING SPARK PLUG FOR INTERNAL COMBUSTION ENGINE

Title:

METHOD FOR MANUFACTURING SPARK PLUG FOR INTERNAL COMBUSTION ENGINE

Document Type and Number:

WIPO Patent Application WO/2014/189088

Kind Code:

A1

Abstract:

Provided is a method for manufacturing a spark plug (1) wherein at least either a central electrode (2) or a ground electrode (3) is provided with a discharge chip (5). In the chip manufacturing process, the discharge chip (5) is manufactured by bonding to each other a discharge portion (51) disposed on a spark discharge gap (11) side and a base material joint (52) made of a material with a melting point lower than the melting point of the discharge portion (51) and bonded to an electrode base material (30). In the temporary bonding process, the discharge chip (5) is temporarily bonded to the electrode base material (30) on the base material joint (52) by resistance welding. In the proper bonding process, the discharge chip (5) is bonded to the electrode base material (30) by laser welding so that the lateral surface (511) of the discharge portion (51) and the surface (31) of the electrode base material (30) can be smoothly bonded to each other through a bonding surface (523) having no pointed edge.

Inventors:

MURAYAMA YUKI (JP)
ABE NOBUO (JP)
SAKAIRI KOICHI (JP)
TANAKA KUNIHIRO (JP)

Application Number:

PCT/JP2014/063507

Publication Date:

November 27, 2014

Filing Date:

May 21, 2014

Export Citation:

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Assignee:

DENSO CORP (JP)
TANAKA PRECIOUS METAL IND (JP)

International Classes:

H01T13/20

Domestic Patent References:

WO2013015262A1

2013-01-31

Foreign References:

JP2008077838A	2008-04-03
JP2009533803A	2009-09-17

Other References: