Pipes and tubular conduits – Combined – With end structure
Reexamination Certificate
2005-01-11
2005-01-11
Hook, James (Department: 3752)
Pipes and tubular conduits
Combined
With end structure
C123S468000, C072S370110, C285S386000
Reexamination Certificate
active
06840283
ABSTRACT:
A high-pressure fuel injection pipe having connecting head portion is provided which is capable of eliminating a fear of the occurrence of cavitation erosion of the inner surface of the connecting head portion and a fatigue failure of the same head portion by having a contour of a cross section of an annular pocket occurring in an inner part of the connecting head portion during a head portion processing operation extend shallowly and gently. This fuel injection pipe has at a connecting end portion of a thick-walled steel pipe having a relatively small diameter, including a seat surface, an annular flange formed so that the flange is axially spaced from the seat surface, and a conical surface connected to the seat surface, extending therefrom to the annular flange and tapering off to a free end of the connecting head portion, wherein the conical surface is provided at a part thereof with an annular, shallow, cross-sectionally curved recess.
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Furugen Munekatsu
Ishida Shigeyuki
Kato Nobuo
Casella Anthony J.
Hespos Gerald E.
Hook James
Usui Kokusai Sangyo Kaisha Limited
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