Metal working – Method of mechanical manufacture – Gas and water specific plumbing component making
Reexamination Certificate
2001-12-03
2003-09-09
Rosenbaum, I Cuda (Department: 3726)
Metal working
Method of mechanical manufacture
Gas and water specific plumbing component making
C029S460000
Reexamination Certificate
active
06615489
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a method of manufacturing a fuel inlet for filling fuel, such as gasoline, into a fuel tank of an automobile or the like.
BACKGROUND OF THE INVENTION
Conventionally known as a fuel inlet for filling fuel, such as gasoline, into a fuel tank of an automobile or the like is, for example, a fuel inlet, as shown in
FIG. 4
, comprising an inlet pipe
102
for conveying fuel into the fuel tank, a filling part
104
formed by expanding an end of the inlet pipe
102
, the filling part
104
being provided with a helical groove
104
b
for engagement with a cap (not shown), and a breather tube
110
for venting air from the fuel tank when the fuel tank is filled with fuel, the breather tube
110
opening into the inlet pipe
102
in the vicinity of the end thereof.
In the case of such a fuel inlet, for the purpose of rust proofing, galvanized steel pipes are used for the inlet pipe
102
and the breather tube
110
, and furthermore, any coating is applied thereto.
In recent years, however, the influence of materials used in automobiles upon the global environment has become a major concern for more and more people, and regulations on use of such materials have been made tighter. Also, a further improvement of components of a fuel system is desired in view of their durability. Furthermore, a further improvement is also required in view of their anti-rust property.
SUMMARY OF THE INVENTION
The present invention was made to meet the aforementioned requirements. More particularly, the object of the invention is to provide a method of manufacturing a fuel inlet having an improved anti-rust property.
In order to attain this object, there is provided a method of manufacturing a fuel inlet, the fuel inlet comprising an inlet pipe for conveying fuel into a fuel tank and a breather tube for venting air from the fuel tank toward an end of the inlet pipe when the fuel is filled into the fuel tank, the method comprising:
a preparatory process in which stainless pipes for manufacturing the inlet pipe and the breather tube are prepared, a pipe expanding process in which an end portion of the inlet pipe is enlarged in diameter to form a filling part, a screw-thread forming process in which a helical groove is formed on a periphery of the filling part, a welding process in which the breather tube is welded to the inlet pipe, and a coating process in which a cationic electrodeposition coating is applied to the fuel inlet.
As material for the stainless pipes, SUS436 is preferably used. Also, in the welding process, an open end of the breather tube may be joined to a periphery of the inlet pipe by means of projection welding. Furthermore, in the screw-thread forming process, a core bar on which a groove is formed is inserted into the filling part, and a roller is moved along the groove, while being pressed against the periphery of the filling part, thereby forming the helical groove.
REFERENCES:
patent: 4651889 (1987-03-01), Uranishi et al.
patent: 4809865 (1989-03-01), Mori et al.
patent: 5769057 (1998-06-01), Hashimoto et al.
patent: 6390124 (2002-05-01), Kido et al.
patent: 6453714 (2002-09-01), Kido et al.
Kawabe Toyohisa
Kido Tsuguo
Yamamoto Seiji
Yoshida Ryozo
Cuda Rosenbaum I
Davis & Bujold P.L.L.C.
Futaba Industrial Co. Ltd.
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