HIGH-PRESSURE FUEL INJECTION PIPE HAVING CONNECTION HEAD PORTION, AND MANUFACTURING METHOD THEREOF
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United States of America Patent
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N/A
Issued Date -
Jan 12, 2012
app pub date -
Mar 24, 2010
filing date -
Mar 24, 2009
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
To provide a high-pressure fuel injection pipe preventing like a generation crack of a pocket portion during formation of a connection head portion, and being robust against fatigue, wherein the connection head portion is configured such that cylindrical face has contours in a section along the axial direction of the pipe from an end portion of a fillet portion of an annular flange portion toward the seat face formed such that an opening angle θ to an axis of the pipe in the section in the axial direction of the pipe satisfies 0°<θ≦20° and a ratio of the length h of the cylindrical face in the axial direction of the pipe and the length H from a terminal of the connection head portion to an end portion of the cylindrical face on the side of the fillet portion satisfies 0.33≦h/H≦0.85.
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