Oil cooler with cooling water side fin and oil side fin

Details Oil cooler with cooling water side fin and oil side fin Oil cooler with cooling water side fin and oil side fin

2000-07-05

2001-07-24

Leo, Leonard (Department: 3743)

Heat exchange

With solids separator for exchange fluid

C165S154000, C165S167000, C165S916000, C123S1960AB, C210S184000

Reexamination Certificate

active

06263960

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to an oil cooler for cooling engine oil circulating in a water-cooled engine, by exchanging heat between cooling water for the water-cooled engine and the engine oil.
2. Description of the Related Art
Recently, a number of apparatuses such as an oil cooler which are installed in an engine room has increased. In such a tendency, clearances among the apparatuses in the engine room have been reduced to comply with the increase in number of the apparatuses and not to increase the size of the engine room. When the clearances among the apparatuses are reduced, however, installation performance (mountability) of the apparatuses deteriorates. This may cause increase in manufacturing cost of the vehicle. Because of this, the size reduction of each apparatus has been required.
SUMMARY OF THE INVENTION
The present invention has been made based on the above problem. An object of the present invention is to provide an automotive oil cooler with a small size.
According to the present invention, an oil cooler has a tube disposed in a cooling water passage and defining an oil passage therein, an oil side fin fixed to an inside wall of the tube, and a water side fin fixed to an outside wall of the tube and having a plate thickness thicker than that of the oil side fin. A pressure of the oil flowing in the oil passage is higher than that of the cooling water flowing in the cooling water passage. Preferably, the oil side and water side fins are corrugated fins.
Accordingly, the oil side and water side fins can be formed to have small fin pitches, respectively, so that the size of the oil cooler is reduced. Further, each of the fins can have a high density and a large withstand pressure strength. Because the plate thickness of the water side fin is thicker than that of the oil side fin, a climbing rate of temperature of the water side fin is prevented from exceeding that of the oil side fin when they are brazed. As a result, brazing deficiencies caused by erosion of the water side fin can be prevented. Further, because the plate thickness of the water side fin is thicker than that of the oil side fin in a state where the pressure of the oil is higher than that of the cooling water, the water side fin can prevent the cooling water passage from being crushed by the pressure imparted from the oil even when brazing defficiencies occur. Preferably, the oil cooler further has a casing, a partition member integrally brazed to the casing and partitioning inside of the casing into the cooing water passage and a filter casing portion, and a filter disposed in the filter casing portion. Accordingly, there is no need to use O-rings for securing sealing property between the cooling water passage and the filter casing portion, resulting in decrease in number of parts for the oil cooler. This further results in manufacturing cost reduction of the oil cooler.


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