초록 ▼

According to the present invention, the cooling apparatus is equipped with a thermostat for opening or closing a water passage between a radiator and a water-cooled engine and a cooling water passage switching valve for switching a water introducing passage for introducing the cooling water around a

According to the present invention, the cooling apparatus is equipped with a thermostat for opening or closing a water passage between a radiator and a water-cooled engine and a cooling water passage switching valve for switching a water introducing passage for introducing the cooling water around a thermosensitive member of the thermostat. When the engine is in a high-load operating condition and when the temperature of the cooling water is equal to or higher than a predetermined temperature, the cooling water immediately after having flowed out of the water-cooled engine flows into around the thermosensitive member of the thermostat by the operation of the cooling water passage switching valve. As a result, the thermostat is operated in response to the temperature of the high temperature cooling water having flowed out of the water-cooled engine, and the set temperature of the cooling water by the thermostat can be shifted to a lower temperature. In this way, it is possible to prevent preferably an excessive rise in the temperature of the cooling water not only when the engine is in a high-load operating condition but also when the engine is in a state of hot soak such as in idling after the vehicle has travelled on an upward slope with a low speed.

대표청구항 ▼

[ What is claimed is:] [1.] A cooling apparatus for cooling a water-cooled engine using cooling water, said apparatus comprising:a cooling water circuit connected to the engine for defining a circulation path for said cooling water to and from the engine;a radiator connected to said cooling water ci

[ What is claimed is:] [1.] A cooling apparatus for cooling a water-cooled engine using cooling water, said apparatus comprising:a cooling water circuit connected to the engine for defining a circulation path for said cooling water to and from the engine;a radiator connected to said cooling water circuit, for cooling the cooling water;a water pump connected to said cooling water circuit, for circulating the cooling water in said cooling water circuit;a thermostat connected to said cooling water circuit and having a first thermosensitive member for sensing a temperature of the cooling water and a first valve element which is movable by said thermosensitive member, for opening and closing a water passage in said cooling water circuit between said radiator and said engine; anda cooling water passage switching valve connected to a portion of said cooling water circuit which receives said cooling water as said cooling water exits said engine, said cooling water passage switching valve being arranged so as to direct said cooling water from said engine toward said thermosensitive member of said thermostat when said cooling water passage switching valve is in a first switch position, wherein,said cooling water passage switching valve is responsive to engine operation, for placing said cooling water passage switch valve in said first switch position when said engine is in a high-load operating condition and when said cooling water is at a temperature which is at least equal to a predetermined value.