Heat exchange having header tank

Heat exchange – Side-by-side tubular structures or tube sections – With manifold type header or header plate

Reexamination Certificate

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Details

C138S162000, C403S335000, C403S353000

Reexamination Certificate

active

06173765

ABSTRACT:

CROSS REFERENCE TO RELATED APPLICATIONS
This application relates to and claims priority from Japanese Patent Application No. 11-20514 filed on Jan. 28, 1999.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to heat exchangers, and particularly to a radiator for cooling coolant flowing from an internal combustion engine.
2. Related Art
JP-A-10-132485 discloses a radiator having plural tubes and a header tank connected to the tubes. The header tank includes a core plate to which the plural tubes are connected, and a tank portion brazed to the core plate. The core plate and the tank portion are formed by pressing to reduce manufacturing cost.
However, the core plate and the tank portion may have a distortion such as warping or waviness during a manufacturing process. Therefore, when the core plate and the tank portion are tentatively assembled, a relatively large clearance may be formed between the core plate and the tank portion. As a result, brazing performance between the core plate and the tank portion may be compromised. Even when the core plate and the tank portion are formed by other processes such as drawing, the core plate and the tank portion may also be distorted during the manufacturing process, thereby compromising the brazing performance between the core portion and the tank portion.
SUMMARY OF THE INVENTION
The present invention is made in light of the foregoing problems, and it is an object of the present invention to provide a heat exchanger having first and second components, in which undesirable clearance is restricted from being formed between the first and second components.
According to the present invention, a heat exchanger has a plurality of tubes and a header tank disposed at a flow-path end of the tubes to communicate with each tube. The header tank has a first tank portion and a second tank portion. The first tank portion has a protruding portion protruding from a wall of the first tank portion, and the second tank portion has a hole into which the protruding portion is inserted. The protruding portion is engaged with the hole when the first tank portion is slidably moved against the second tank portion in a parallel direction with respect to a longitudinal direction of the header tank. When the protruding portion is engaged with the hole, the second tank portion is partially clamped between the wall of the first tank portion and the protruding portion.
Therefore, when the first tank portion and the second tank portion are tentatively assembled together, the first tank portion sufficiently contacts the second tank portion, and a relatively large clearance is restricted from being formed between the first and second tank portions. As a result, brazing performance between the first and second tank portions is improved.


REFERENCES:
patent: 1028829 (1912-06-01), Reuterdahl
patent: 2215318 (1940-09-01), Bristol
patent: 3433270 (1969-03-01), Fischer et al.
patent: 3866675 (1975-02-01), Bardon et al.
patent: 4165944 (1979-08-01), Sunasky
patent: 4802716 (1989-02-01), Rock et al.
patent: 5125454 (1992-06-01), Creamer et al.
patent: 5207738 (1993-05-01), Dey
patent: 5489162 (1996-02-01), LoCicero et al.
patent: 5678628 (1997-10-01), Aki et al.
patent: 10-132485 (1998-05-01), None
patent: 10-132490 (1998-05-01), None
patent: 11-311497 (1999-11-01), None

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