Closed magnetic path ignition coil assembly e.g. for motor vehicle

摘要

An ignition coil assembly for an internal combustion engine, comprising: a housing made of an electrically insulating material; a first laminated core located in said housing and having a plurality of surface portions exposed to the outside of said housing and a plurality of magnetic path connection end faces exposed to the inside of said housing; a second laminated core having a plurality of magnetic path connection end faces each facing across a small gap a respective one of said magnetic path connection end faces of said first laminated core and contained in said housing to form a closed magnetic path, along with said first laminated core; a primary coil and a secondary coil which are wound on said second laminated core; a molding resin filling in said housing to insulate and fix in place said second laminated core, said primary coil and said secondary coil; and a plurality of soft waterproof layers provided on the inner walls of said housing to cover said magnetic path connection end faces of said first laminated core