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. 06, 2024
Filed:
Apr. 03, 2023
Denso Corporation, Kariya, JP;
Yuki Kondo, Kariya, JP;
DENSO CORPORATION, Kariya, JP;
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.