Patent ID: 6557519
Filing Date: 2003-05-06
Classification: F01L,F02B,Y02T

Abstract:
An internal combustion engine including:a housing and piston means that are cyclically relatively displaceable along an axis to define a variable volume working chamber; means to admit air and fuel to said working chamber for forming an ignitable mixture after compression of the air therein; and means to exhaust combustion products from said working chamber; wherein said variable volume working chamber includes at least two sub-chambers substantially co-axial about and mutually displaced on said axis and in communication at a cross section at which gas in one sub-chamber may expand at least partially laterally as it flows from said sub-chamber into the other sub-chamber; wherein said air admission means, said exhaust means and said sub-chambers are arranged so that a swirl of gas is generated and maintained about said axis in both of said sub-chambers during operation of the engine; and wherein said one sub-chamber is sealed and defined laterally and at an end by integral heat resistant or low thermal conductivity wall structure having a lateral exterior, a heat insulation jacket about substantially the whole of said lateral exterior of said wall structure, and associated heat dissipation means, arranged so that, during operation of the engine, surfaces of said wall structure bounding said one sub-chamber are maintained at a temperature which is substantially higher than wall surfaces bounding said other sub-chamber.