| 摘要 |
PURPOSE:To promote warming of a cylinder block and to reduce the frictional loss of an engine, by exchanging heat between water passed through a water circulating passage for cooling a cylinder head and lubricating oil passed through an oil circulating passage for cooling the cylinder block at the time of warming lubricating oil in the oil circulating passage. CONSTITUTION:A cooling-water circulating passage consisting of a radiator 11, a water pump 7, a by-pass pipe 15 and a temperature-sensitive valve 13 is connected to a cooling passage 5 of a cylinder head 1. On the other hand, a cooling- oil circulating passage consisting of a radiator 21, a by-pass pipe 22 and a temperature-sensitive valve 19 is connected to a cooling passage 6 of a cylinder block 3, so as to circulate oil via a strainer 17 and an oil pump 16. Further, a temperature-sensitive valve 29 and a conduit 30 are provided in the cooling-oil circulatng passage, so as to feed oil to a heat exchanger 9 and to exchange heat with cylinder head cooling water when the temperature of oil is low. |
