Ignition coil for IC engine - has one coil per spark plug placed over threaded peg with boss screwed down over it

摘要

The ignition coil for each spark plug of an IC engine has a closed annular core (13) around a part of which are arranged primary and secondary windings surrounded by a insulating case. There is a fastener (10) so that it can be attached to the cylinder head (11). The fastener uses a boss (29) and a peg (16) which projects from the core with a retaining ring (42) between them. The ring fits between a notch in the peg and a spiral groove on the boss and enables the boss to be screwed down onto the peg. The top (21) of the peg is bevelled so that the ring can be easily fitted onto it. ADVANTAGE - Rapid attachment or removal of coil to cylinder head.