Nixon & Vanderhye P.C.
Ingition coil for internal combustion engine
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.
Denso Corporation
H H
H01F H01F
additional inventional
Takashi Hajime Katsunori Kazuhide Masahiro Koji Yoshitaka Kaneo Masafuyu Masahiko Shigeya Kazutoyo Jyunichi Hidetoshi
Tauchi Kasai Akimoto Kawai Inagaki Tsunenaga Sato Buma Sano Aoyama Abe Osuka Wada Nakashima