LOW NOISE LEVEL INTERNAL COMBUSTION ENGINE

摘要

An internal combustion engine (10) comprises a cylinder block having a skirt section (14), main bearing bulkheads (16), each bearing bulkhead being formed with a bearing section (16a) for receiving a crankshaft and including an upper part (16b) located above the level of the crankshaft axis, and a lower part (16c) located below the crankshaft axis level; and a main bearing cap (20) securely connected to each bearing bulkhead for being associated with the bulkhead bearing section (16a) so as to rotatably support the crankshaft. The engine is characterized by a damping member (26) made of a material which is of high damping capacity and oil- and heat-resistance, the damping member being disposed between the bearing bulkhead lower part (16c) and the bearing cap (20). The invention is useful for effectively damping the vibration of the bearing cap (20) in order to achieve noise reduction of the cylinder block skirt section.