Spark ignition engine
A cylindrical part capable of supporting an ignition-coil-integrated plug cap is formed on a head cover so as to correspond to a plug hole of a cylinder head. The cylindrical part is formed by fitting and fixing a pipe material to a mounting hole part formed in the head cover, the mounting hole part facing the plug hole.
1. A spark ignition engine comprising a cylindrical part capable of supporting a plug cap connected to an ignition coil, the cylindrical part being formed on a flange part of a head cover so as to correspond to a plug hole of a cylinder head,
wherein the flange part is a portion covering the plug hole in the cylinder head and is formed continuously to a side of a main cover part that covers a valve operating mechanism.
2. The spark ignition engine according to claim 1 , wherein the cylindrical part is formed by fitting and fixing a pipe material to a mounting hole part formed in the head cover, the mounting hole part facing the plug hole.
3. The spark ignition engine according to claim 2 , wherein the pipe material is inserted into the mounting hole part by press fitting.
4. The spark ignition engine according to claim 1 , further comprising a fixing unit that prevents the plug cap supported by the cylindrical part from being detached from the cylindrical part, the fixing unit being provided on an outer wall of a valve operating mechanism housing part of the head cover.
5. The spark ignition engine according to claim 2 , further comprising a fixing unit that prevents the plug cap supported by the cylindrical part from being detached from the cylindrical part, the fixing unit being provided on an outer wall of a valve operating mechanism housing part of the head cover.
6. The spark ignition engine according to claim 3 , further comprising a fixing unit that prevents the plug cap supported by the cylindrical part from being detached from the cylindrical part, the fixing unit being provided on an outer wall of a valve operating mechanism housing part of the head cover.
7. The spark ignition engine according to claim 4 , wherein
the plug cap is an ignition-coil-integrated plug cap having an ignition coil, and
the fixing unit includes a female screw part for screwing a coil housing part of the ignition-coil-integrated plug cap supported by the cylindrical part, the female screw part being formed on the outer wall.
8. The spark ignition engine according to claim 5 , wherein
the plug cap is an ignition-coil-integrated plug cap having an ignition coil, and
the fixing unit includes a female screw part for screwing a coil housing part of the ignition-coil-integrated plug cap supported by the cylindrical part, the female screw part being formed on the outer wall.
9. The spark ignition engine according to claim 6 , wherein
the plug cap is an ignition-coil-integrated plug cap having an ignition coil, and
the fixing unit includes a female screw part for screwing a coil housing part of the ignition-coil-integrated plug cap supported by the cylindrical part, the female screw part being formed on the outer wall.
10. The spark ignition engine according to claim 7 , further comprising a bracket screwed to the coil housing part, the bracket being bolted to the female screw part.
11. The spark ignition engine according to claim 8 , further comprising a bracket screwed to the coil housing part, the bracket being bolted to the female screw part.
12. The spark ignition engine according to claim 9 , further comprising a bracket screwed to the coil housing part, the bracket being bolted to the female screw part.
13. The spark ignition engine according to claim 1 , further comprising a head cover gasket provided between the cylinder head and the head cover, the head cover gasket being formed with a punch hole corresponding to the plug hole.
14. The spark ignition engine according to claim 2 , further comprising a head cover gasket provided between the cylinder head and the head cover, the head cover gasket being formed with a punch hole corresponding to the plug hole.
15. The spark ignition engine according to claim 3 , further comprising a head cover gasket provided between the cylinder head and the head cover, the head cover gasket being formed with a punch hole corresponding to the plug hole.
16. The spark ignition engine according to claim 4 , further comprising a head cover gasket provided between the cylinder head and the head cover, the head cover gasket being formed with a punch hole corresponding to the plug hole.
17. The spark ignition engine according to claim 5 , further comprising a head cover gasket provided between the cylinder head and the head cover, the head cover gasket being formed with a punch hole corresponding to the plug hole.
18. The spark ignition engine according to claim 6 , further comprising a head cover gasket provided between the cylinder head and the head cover, the head cover gasket being formed with a punch hole corresponding to the plug hole.
19. The spark ignition engine according to claim 7 , further comprising a head cover gasket provided between the cylinder head and the head cover, the head cover gasket being formed with a punch hole corresponding to the plug hole.
20. The spark ignition engine according to claim 8 , further comprising a head cover gasket provided between the cylinder head and the head cover, the head cover gasket being formed with a punch hole corresponding to the plug hole.