| 摘要 |
<p>The present invention provides a cooling water circulating apparatus (1) capable of securing a required flow rate of cooling water without increasing the heads of water pumps, the apparatus including a first water pump (4) which has a first supply port (5) for supplying thereinto cooling water which is to flow through the interior of an engine (2), and a first discharge port (6) for discharging therefrom the supplied cooling water to the engine (2) again, and which is connected to and rotated with a cam shaft (2A) of the engine, a control mechanism (7) adapted to cut off a flow of the cooling water, which is directed from a radiator (3) to the first supply port (5), when the temperature of the cooling water is not higher than a predetermined level, and communicate the radiator (3) and first supply port (5) with each other when the temperature of the cooling water is higher than the predetermined level, and a second water pump (8) which has a second supply port (9) for supplying thereinto cooling water which is to flow through the interior of the engine (2), and a second discharge port (10) for discharging therefrom the supplied cooling water to the supply port (5) of the first water pump (4), and which is not rotated when the temperature of the cooling water is not higher than a predetermined level, and electrically rotated when the temperature of the cooling water is higher than the predetermined level. <IMAGE></p> |
