Internal combustion engine having a permanent ground electrode and replaceable center electrode element
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 bore extending between the outer and inner walls along an axis and including an intermediate transverse seat for engaging an element introduced through the outer wall against movement toward the inner wall, a permanent ground electrode permanently affixed to the cylinder head at the inner wall proximate to the bore, a spark plug center electrode element replaceably received in the bore through the outer wall and comprising a center electrode and a surrounding insulator body having a shoulder engaging the bore seat, the center electrode extending within the combustion chamber spaced apart from the ground electrode so as to cooperate therewith to define a spark gap, and locking means removably attached to the cylinder head for clamping the insulator body against the bore seat to secure the center electrode element in the cylinder head bore in spark generating arrangement with the ground electrode.
- Assignee:
- General Motors Corp., Detroit, MI (USA)
- Patent Number(s):
- US 5014656; A
- Application Number:
- PPN: US 7-513498
- OSTI ID:
- 5127938
- Country of Publication:
- United States
- Language:
- English
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