Ignition coil having rigid mounting structure

An ignition coil comprising:

• a cylindrical portion that includes a primary coil and a secondary coil, the secondary coil being wound coaxially with respect to the primary coil;
• wherein the cylindrical portion is capable of being inserted into a plughole of an internal combustion engine,
• the cylindrical portion has a tip end in an axial direction of the cylindrical portion,
• the tip end of the cylindrical portion has a plug mounting hole, into which a sparkplug is mounted,
• the plug mounting hole accommodates a high voltage terminal that electrically connects with the secondary coil,
• the plug mounting hole accommodates a coil spring that makes contact with the high voltage terminal,
• the cylindrical portion has a base end portion in one end with respect to the axial direction of the cylindrical portion,
• the base end portion of the cylindrical portion includes one flange portion,
• the one flange portion outwardly protrudes in a radial direction of the cylindrical portion, and
• the one flange portion has a plurality of bolt insertion holes, through which a bolt is respectively inserted.

An ignition coil comprising:

• a cylindrical portion that includes a primary coil and a secondary coil, the secondary coil being wound coaxially with respect to the primary coil;
• wherein the cylindrical portion is capable of being inserted into a plughole of an internal combustion engine,
• the cylindrical portion has a tip end in an axial direction of the cylindrical portion,
• the tip end of the cylindrical portion has a plug mounting hole, into which a sparkplug is mounted,
• the plug mounting hole accommodates a high voltage terminal that electrically connects with the secondary coil,
• the plug mounting hole accommodates a coil spring that makes contact with the high voltage terminal,
• the cylindrical portion has a base end portion in one end with respect to the axial direction of the cylindrical portion,
• the base end portion of the cylindrical portion includes a plurality of flange portions,
• the plurality of flange portions outwardly protrudes in a radial direction of the cylindrical portion, and
• each of the plurality of flange portions has one bolt insertion hole, through which a bolt is inserted.

An ignition coil comprising:

• a cylindrical portion that includes a primary coil and a secondary coil, the secondary coil being wound coaxially with respect to the primary coil;
• wherein the cylindrical portion is capable of being inserted into a plughole of an internal combustion engine,
• the cylindrical portion has a tip end in an axial direction of the cylindrical portion,
• the tip end of the cylindrical portion has a plug mounting hole, into which a sparkplug is mounted,
• the plug mounting hole accommodates a high voltage terminal that electrically connects with the secondary coil,
• the plug mounting hole accommodates a coil spring that makes contact with the high voltage terminal,
• the cylindrical portion has a base end portion in one end with respect to the axial direction of the cylindrical portion,
• the base end portion of the cylindrical portion includes a plurality of hooking portions that respectively hooks around an opening of the plughole of the internal combustion engine,
• the plurality of hooking portions outwardly protrudes in a radial direction of the cylindrical portion, and
• the plurality of hooking portions is formed in locations, which are apart from each other in a circumferential direction of the cylindrical portion.