Internal-combustion engines – Cooling
Patent
1997-06-17
1998-11-24
Kwon, John T.
Internal-combustion engines
Cooling
123 4149, 415206, F01P 714
Patent
active
058393978
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FILED
The present invention relates to an engine cooling system, particularly a cooling system for engines equipped on automobiles or construction machines, for example, and a construction machine employing the engine cooling system.
BACKGROUND ART
Known techniques relating to the above type of engine cooling system are, for example, as follows.
This known technique discloses that, in an engine cooling portion of a construction machine, cooling air is supplied to a heat exchanger by an axial fan coupled to an engine crankshaft through a fan belt.
This known technique discloses that, in an engine cooling portion of a working vehicle such as an agricultural tractor, a centrifugal fan is used as a fan for supplying cooling air to enhance a cooling ability.
With this known technique, a single centrifugal fan is employed such that cooling air taken in from the front of an agricultural machine and having passed a radiator is sucked into the centrifugal fan from the front thereof, and cooling air from an engine room rearward of the centrifugal fan is sucked into the centrifugal fan from the back thereof.
DISCLOSURE OF THE INVENTION
The above known techniques have problems below.
Generally, in an engine room, an air cooling ability required for cooling external surfaces of an engine is much smaller, e.g., about 1/3 or less, than an air cooling ability required for cooling heat exchangers such as a radiator and an oil cooler. In the above known techniques (1) and (2), however, because cooling air heated to high temperature after cooling the heat exchangers such as the radiator flows into the engine side as it is, the flow rate of cooling air is the same between the heat exchanger side and the engine side. Stated otherwise, because the cooling air is discharged at a large flow rate necessary for cooling the heat exchanger side in its entirety through an exhaust port formed on the engine side, an opening defining the exhaust port has a very large size. This results in a reduction in the degree of sealing on the side of the engine that is the greatest noise source, and hence a difficulty in reducing noise.
Also, many electric equipments, etc. are usually mounted in the engine room around the engine. In the above known techniques (1) and (2), however, because air heated to high temperature after cooling the heat exchangers such as the radiator flows around the electric equipments, the effect of cooling the electric equipments is so reduced as to raise a problem in reliability of the electric equipments.
On the other hand, such a problem is avoided in the above known technique (3) because cooling air for cooling the electric equipments around the engine is introduced through a different flow path from that of cooling air passing the radiator and high-temperature air heated after cooling the radiator is not introduced to the electric equipments. However, the above known technique (3) has another problem as follows.
The centrifugal fan employed in the above known technique (3) is illustrated as functioning as a double-suction centrifugal fan which sucks cooling air from two directions, i.e., from the radiator side and the engine side. In substance, however, the known centrifugal fan is made up of one single-suction centrifugal fan having one impeller. This impeller is designed to positively suck air on the radiator side and induce cooling air. For air on the engine side, however, a gap is defined on the back side of the fan, allowing air to be merely introduced through the gap under negative pressure. Thus, the impeller is not structured so as to positively suck air on the engine side and induce cooling air. As a result of such a structure, the flow rate of cooling air on the engine side is much smaller than that of cooling air on the radiator side. Also, the amounts of cooling air sucked from both the directions are instable in relative relation. Accordingly, the electric equipments, etc. cannot be cooled sufficiently.
The present invention intends to solve the foregoing problems encountered in the known
REFERENCES:
patent: 3642062 (1972-02-01), Edmaier et al.
patent: 3780411 (1973-12-01), Bulin
patent: 5478275 (1995-12-01), Malm
Funabashi Shigehisa
Hirami Ichiro
Kaneko Zenji
Mihara Shin'ichi
Shimode Shin'ichi
Hitachi Construction Machinery Co. Ltd.
Kwon John T.
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