High pressure fuel injection tube and method of forming the same
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United States of America Patent
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May 8, 2007
Grant Date -
Mar 2, 2006
app pub date -
Sep 1, 2005
filing date -
Sep 2, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A high pressure fuel injection tube includes a connection head with a seat face in a spherical shape. A ring-like flange is spaced from the seat face in an axial direction. A conical portion is formed in the interval between the ring-like flange and the seat face. An undercut bent recess groove with a ring-like shape and a deep depth is formed on the conical portion. Thus, a shallow smooth ring-like recess groove is formed on an inner side of the connection head, and a compressive residual stress is present at an inner peripheral face of the ring-like groove.
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