IGNITION COIL - DENSO CORP

Title:

IGNITION COIL

Document Type and Number:

WIPO Patent Application WO/2003/102981

Kind Code:

A1

Abstract:

An ignition coil comprises a thermal stress-relieving member with an optimum wall thickness. An ignition coil comprises a housing, a rod-like center core (54) provided in substantially the middle in the housing, a thermal stress-relieving member (52) covering the external periphery of the center core (54), a hollow cylinder-like spool (4) provided at the outer periphery side of the thermal stress- relieving member (52) with a gap (9) between the spool and the stress-relieving member, and a resin insulation material (8a) filled in the gap (9) and hardened. The thermal stress-relieving member (52) is wound on the center core (54). The wall thickness of the thermal stress-relieving member (52) is set such that thermal stress applied by thermal deformation of the center core (54) to the resin insulation material (8a) can be relieved to a saturation value.

Inventors:

WADA JUNICHI (JP)

Application Number:

PCT/JP2003/006940

Publication Date:

December 11, 2003

Filing Date:

June 02, 2003

Export Citation:

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Assignee:

DENSO CORP (JP)
WADA JUNICHI (JP)

International Classes:

H01F27/32; H01F38/12; (IPC1-7): H01F38/12

Foreign References:

JPH11144986A	1999-05-28
JP2000269056A	2000-09-29
JPH10340822A	1998-12-22
JPH11243023A	1999-09-07
JP2001110657A	2001-04-20
JP2000049024A	2000-02-18
JP2003229319A	2003-08-15
US6208231B1	2001-03-27
JP2001110657A	2001-04-20
EP1026394A2	2000-08-09

Other References: