| 摘要 |
PURPOSE:To absorb thermal deformation and firmly fix a subchamber constitutional member further increase combustibility, by providing a porous flame sprayed layer consisting of heat resistant synthetic resin containing a soft metal and fitting the subchamber constitutional member to be fixed in a cylinder head cavity part. CONSTITUTION:A subchamber constitutional member 10 is fitted to be held in a cavity part 7 of a cylinder head 4 by providing a porous flame sprayed layer 14, consisting of heat resistant synthetic resin 14b containing a soft metal 14a, between the external surface of the member 10 and the internal surface of the cavity part 7. In this way, the gap is air-tightly filled to eliminate a quench zone of combution gas, and generation of initial HC is decreased to improve emission performance. While a manufature error and/or thermal deformation are absorbed by the flame sprayed layer 14, and the subchamber constitutional member 10 can be firmly fixed. Further a heat insulating effect is obtained by voids 14c... in the inside of the layer 14, and the inside of a subcombustion chamber 8 can be maintained at high temperature, then combustibility of an engine can be improved. |
