The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 24, 2004
Filed:
May. 07, 2002
Kazuhide Kawai, Kariya, JP;
Masafuyu Sano, Okazaki, JP;
Shigeya Abe, Aichi-ken, JP;
Masahiro Inagaki, Chiryu, JP;
Hajime Kasai, Kariya, JP;
Hidetoshi Nakashima, Chiryu, JP;
Jyunichi Wada, Aichi-ken, JP;
Koji Tsunenaga, Chiryu, JP;
Kazutoyo Osuka, Gamagori, JP;
Masahiko Aoyama, Kariya, JP;
Takashi Tauchi, Nagoya, JP;
Kaneo Buma, Oobu, JP;
Yoshitaka Sato, Toyohashi, JP;
Katsunori Akimoto, Okazaki, JP;
Denso Corporation, Kariya, JP;
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 ( ) in a projection portion ( ) 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 ( ). Accordingly, a frontal projected area of the projection portion ( ) 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 ( ) 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 ( ) 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) ( ) due to a thermal stress so as to reduce an insulating property.