Ignition coil for internal combustion engine

Details Ignition coil for internal combustion engine Ignition coil for internal combustion engine

2005-05-24

2005-05-24

Mai, Anh (Department: 2832)

Inductor devices

With outer casing or housing

C336S092000, C336S096000

Reexamination Certificate

active

06897755

ABSTRACT:
In a stick coil, there is disclosed an ignition coil for an internal combustion engine which can prevent a crack (a collar leak) from being generated due to a thermal stress. In this ignition coil, the structure is made such that a size (L) of a portion which is in parallel to an axial direction of a primary spool (121) in a projection portion (121b) is larger than a size (T) of a portion which is in parallel to an orthogonal direction to the axial direction of the primary spool (121). Accordingly, a frontal projected area of the projection portion (121b) as seen from a flowing direction of a resin becomes small, a resin flow is hard to get out of order at a time when the resin flows through a portion corresponding to the projection portion (121b) at the forming time, and a convoluted void and a weld are hard to be generated. Accordingly, since it is possible to prevent a mechanical strength in a root portion of the projection portion (121b) from being reduced, it is possible to previously prevent a crack from being generated in the root portion of the projection portion (the collar portion) (121b) due to a thermal stress so as to reduce an insulating property.

REFERENCES:
patent: 4639706 (1987-01-01), Shimizu
patent: 5963118 (1999-10-01), Kawano et al.
patent: 6060973 (2000-05-01), Kawano et al.
patent: 6208231 (2001-03-01), Oosuka et al.
patent: 6386189 (2002-05-01), Shimada et al.
patent: 6571784 (2003-06-01), Shiimada et al.
patent: 11-111545 (1999-04-01), None

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