Ignition coil and ignition device equipped with the same for internal combustion engine
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United States of America Patent
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Aug 6, 2024
Grant Date -
Oct 5, 2023
app pub date -
Apr 3, 2023
filing date -
Apr 3, 2023
priority date (Note) -
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Abstract
An ignition coil includes a coil unit, a hollow cylindrical joint, and a spring. The joint couples the coil unit with a spark plug. The spring is inserted into a through-hole in the joint to electrically connect the coil unit and the spark plug together. The joint has electrical insulation and rubber elasticity. The spring includes a spring base section, a spring head section, and a spring intermediate section lying between the spring base and head sections. The joint has an inner peripheral surface placed in direct contact with the spring intermediate section in a radial direction of the joint. The spring intermediate section is wound more densely than each of the spring base section and the spring head section in a condition where the spring is subjected to no load. This structure serves to minimize a risk of generation of a corona discharge in the ignition coil and an ignition device equipped with the ignition coil and improve the productivity thereof.
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