Precombustion chamber with insulating means
A precombustion chamber is described provided with an arrangement for thermally insulating a cylinder head of an internal combustion engine from a combustion gas in the precombustion chamber, comprising: a hollow ceramic body which provides a precombustion chamber and is disposed within a hollow space within the engine for the precombustion chamber. The hollow ceramic body is provided with a protruding collar portion. It has an enlarged diameter along the periphery to form a pair of shoulders; a hollow metallic fitting member is disposed around the hollow ceramic body within the hollow space for mitigating and absorbing the stress produced between the cylinder head and the hollow ceramic body. The fitting is secured to the collar portion of the ceramic body leaving a clearance between the ceramic body and the fitting member; and seal means for sealing the clearance provides a closed space therebetween. The seal means is secured between the shoulders and the fitting member.
- Assignee:
- 501 NGK Spark Plug Co., Ltd., Aichi
- Patent Number(s):
- US 4672933
- OSTI ID:
- 6429433
- Country of Publication:
- United States
- Language:
- English
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