| 摘要 |
PROBLEM TO BE SOLVED: To optimize an opening/closing switching temperature of each of thermo-valves with respect to a cooling device including the plurality of thermo-valves.SOLUTION: A two-system cooling device in which a head-side water jacket 21 and a block-side water jacket 31 are independent from each other, is provided with a main thermo-valve 81 switched from a closed state to an opened state by increase of a cooling water temperature to supply cooling water to a radiator 6, a block thermo-valve 82 switched from a closed state to an opened state by increase of a cooling water temperature to supply cooling water to the block-side water jacket 31, and a warm water cut valve 83 switched from an opened state to a closed state by increase of a cooling water temperature to stop the supply of cooling water to a throttle body 7. A switching temperature of the warm water cut valve 83 is higher than a switching temperature of the block thermo-valve 82 and lower than a switching temperature of the main thermo-valve 81. |
