IGNITION COIL UNIT FOR ENGINE AND ENGINE PROVIDED WITH PLASTIC HEAD COVER

Title:

IGNITION COIL UNIT FOR ENGINE AND ENGINE PROVIDED WITH PLASTIC HEAD COVER

Document Type and Number:

WIPO Patent Application WO/1998/053467

Kind Code:

A1

Abstract:

An ignition coil unit for engines wherein the diameter of a coil of an independently ignitable ignition coil unit is reduced by improving resistance to thermal shock and relaxation of static focusing, i.e. insulation, between a secondary coil and a center core of the unit. The unit can be applied to an engine provided with a plastic head cover, and workability in assembling the unit can be improved. A secondary coil (3) is disposed inside a primary coil (5), and a soft epoxy resin (17) is filled between a secondary bobbin (2) and a center core (1). The bobbin (2) is designed so that the epoxy resin (17) is filled from the lower-voltage side of the secondary coil. The inside diameter of the bobbin (2) is tapered in such a manner that the lower-voltage side of the secondary coil is wider than the higher-voltage side, so that the thickness on the lower-voltage side of the secondary coil is decreased and the thickness on the higher-voltage side is increased. The epoxy resin (17) has a recess (17') formed by pressure-molding, and has a value Tg that satisfies the condition that an allowable stress of the secondary bobbin is greater than a stress caused at -40� C minus the glass transition point (Tg) of insulating resin. The bobbin (2) is made of PPS, and the primary coil is wound with a primary bobbin set outside the secondary coil assembly to wind both as an assembly.

Inventors:

SHIMADA JUNICHI (JP)
SUGIURA NOBORU (JP)
ANZO YOICHI (JP)
KONDO EIICHIRO (JP)
KOBAYASHI KAZUTOSHI (JP)
KOSAI TAKAHIDE (JP)
UEDA TOSHIAKI (JP)

Application Number:

PCT/JP1998/002244

Publication Date:

November 26, 1998

Filing Date:

May 22, 1998

Export Citation:

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Assignee:

HITACHI LTD (JP)
HITACHI CAR ENG CO LTD (JP)
SHIMADA JUNICHI (JP)
SUGIURA NOBORU (JP)
ANZO YOICHI (JP)
KONDO EIICHIRO (JP)
KOBAYASHI KAZUTOSHI (JP)
KOSAI TAKAHIDE (JP)
UEDA TOSHIAKI (JP)

International Classes:

F02P3/02; F02P3/04; F02P13/00; H01F27/32; H01F38/12; H01T13/44; (IPC1-7): H01F38/12; F02P15/00

Foreign References:

JPH01153620U	1989-10-23
JPS49627A	1974-01-07
JPH0969452A	1997-03-11
JPH06295817A	1994-10-21
JPS56157728U	1981-11-25
JPS5656630U	1981-05-16
JPH09134829A	1997-05-20
JPH08250342A	1996-09-27
JPS57111013A	1982-07-10
JPH08339928A	1996-12-24
JPH06325955A	1994-11-25
JPH08144916A	1996-06-04
JPH10149934A	1998-06-02
JPH02146413U	1990-12-12
JPS6045416U	1985-03-30

Other References: