| abstract |
In this combustion chamber structure for diesel engines, precombustion chamber bodies(4) in which precombustion chambers(2) are formed are installed via heat insulating layers(13,29,30,27,36) in cavities(19) formed in pistons(3), so as to improve the heat insulating capability of the precombustion chambers(2) and the combustion rates in the precombustion chambers (2) and primary chambers(1), minimize the generation of HC and NO x and increase the thermal efficiently. The precombustion chamber bodies(4) comprise upper chambers (9), lower chambers(8) and gaskets(12) of a low heat conductivity provided between the upper and lower chambers(9,8). The upper chambers(9) are provided in the walls thereof with central insert bores(5) into which fuel injection nozzles(10) are thrusted in positions in the vicinity of the upper dead centers of the pistons, and communication ports(6), which allows the primary chambers(1) and precombustion chambers(2) to communicate with each other, around the central insert bores(5). |