| 摘要 |
The invention provides a water-cooled internal combustion engine for a vehicle. A water jacket allowing the cooling water to circulate is formed on an internal combustion engine main body having a cylinder cover. A thermostat is installed on the internal combustion engine main body and controls according to a state of the cooling water which is discharged from the water jacket and guided to a radiator side and the state of that guided to a bypass path side; the thermostat is equipped on the cylinder cover and forms at least a part of a bypass path on the internal combustion engine main body and avoids the heat from the internal combustion engine main body from influencing the cooling water circulating in the bypass path as much as possible. The thermostat (84) is equipped on the cylinder cover (27). A part of the bypass path (83) is adjacent to an air inlet (45). Viewing along the axial direction of a cylinder hole (40), a part of the bypass path (83) extends in a direction orthogonalto the air inlet (45) and the bypass path and the air inlet (45) are overlapped on the cylinder cover. |
