CYLINDER HEAD OF FOUR-VALVE AUXILIARY CHAMBER TYPE DIESEL ENGINE

摘要

PURPOSE: To provide a four-valve auxiliary chamber type diesel engine in which a horizontal parting wall between intake valves and exhaust valves, and connection walls connecting exhaust ports to each other are cooled favorably. ;CONSTITUTION: A line of intake valves 2 and a line of exhaust valves 3 are positioned in parallel lines to a crankshaft respectively, and an auxiliary chamber 4 is positioned on the outer side of the line of the intake valves 2. Partition walls between two intake ports 5 and exhaust ports 6 are connected to each other inside a cylinder head 1 on the intake upstream side and the exhaust downstream side. A first cooling water passage 9 penetrating from a front end surface of the cylinder head to a back end surface to go through a horizontal partition wall 7 between the intake and exhaust ports is formed. A second cooling water passage 10 is formed crossing the first cooling water passage in the perpendicular direction to the first cooling water passage. A third cooling water passage 13 is formed in the perpendicular direction to connection walls connecting the second cooling water passage and the exhaust ports to each other through the second cooling water passage to penetrate the connection wall to communicate with a water jacket 12. Cooling water supply systems 14, 15 separate from a cylinder body cooling system are connected to these cooling water passages.;COPYRIGHT: (C)1993,JPO&Japio