US 12,249,452 B2
Ignition coil for use in internal combustion engine
Kohei Adachi, Osaka (JP); Shintaro Yamamura, Osaka (JP); and Eiji Kawaguchi, Osaka (JP)
Assigned to DIAMOND&ZEBRA ELECTRIC MFG.CO., LTD., Osaka (JP)
Filed by DIAMOND & ZEBRA ELECTRIC MFG.CO., LTD., Osaka (JP)
Filed on Feb. 14, 2022, as Appl. No. 17/671,266.
Claims priority of application No. 2021-049164 (JP), filed on Mar. 23, 2021.
Prior Publication US 2022/0310307 A1, Sep. 29, 2022
Int. Cl. H01F 38/12 (2006.01); F02P 3/04 (2006.01); H01F 27/02 (2006.01); H01F 27/29 (2006.01); H01F 27/34 (2006.01)
CPC H01F 27/29 (2013.01) [F02P 3/04 (2013.01); H01F 27/02 (2013.01); H01F 27/34 (2013.01); H01F 38/12 (2013.01)] 8 Claims
OG exemplary drawing
 
1. An ignition coil for use in an internal combustion engine comprising:
a coil assembly including a primary coil and a secondary coil;
a lead terminal electrically connected to the secondary coil;
a noise prevention resistor electrically connected to a spark plug that performs an ignition operation in a combustion chamber of the internal combustion engine, the noise prevention resistor being configured to reduce an ignition noise; and
a case holding the coil assembly, the lead terminal, and the noise prevention resistor, wherein
an internal space of the case includes;
a first space holding the coil assembly and the lead terminal; and
a second space that is continuous with the first space and holds the noise prevention resistor,
the case includes a pair of guides protruding toward the first space, and
while the coil assembly, the lead terminal, and the noise prevention resistor are held in the case, the lead terminal passes through a gap between the pair of guides and is in contact with an exposed surface exposed to the first space in the noise prevention resistor.