Spark plug assembly for internal combustion engine
This patent describes an internal combustion engine. It comprises a cylinder head having an outer wall, an inner wall forming at least a portion of a combustion chamber, a spark plug-receiving bore between the outer and inner walls and having a bore axis. The bore having an annular seat disposed between the outer and inner walls generally facing the outer wall and an axial slot extending between the seat and the cylinder head inner wall; a spark plug assembly received in the bore. The spark plug assembly comprising a ground electrode element having an annulus disposed on the seat and an elongated ground electrode extending from the annulus and received in the slot for protruding into the combustion chamber, and a center electrode element having a center electrode and a surrounding insulator body. The insulator body having an annular shoulder for engaging the annulus; the center electrode protruding into the combustion chamber and spaced apart from the ground electrode in the combustion chamber; and locking means for cooperatively engaging the cylinder head and the insulator body to clamp the insulator body shoulder against the annulus on the seat, thereby securing the center electrode element and the ground electrode element in position in the cylinder head bore.
- Assignee:
- General Motors Corp., Detroit, MI (USA)
- Patent Number(s):
- A; US 4989557
- Application Number:
- PPN: US 7-513300
- OSTI ID:
- 6360901
- Country of Publication:
- United States
- Language:
- English
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