{
  "$type": "site.standard.document",
  "description": "Problem to be solved To provide a high-pressure fuel injection pipe which prevents generation of a crack of a pocket portion during formation of a head portion, generation of a crack due to cavitation erosion, and occurrence of tensile stress associated with formation of a pocket, and which is…",
  "path": "/patents/1005750",
  "publishedAt": "2012-02-01T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F02M55/005",
    "USUI KOKUSAI SANGYO KK [JP]"
  ],
  "textContent": "Problem to be solved To provide a high-pressure fuel injection pipe which prevents generation of a crack of a pocket portion during formation of a head portion, generation of a crack due to cavitation erosion, and occurrence of tensile stress associated with formation of a pocket, and which is robust against, fatigue failure. Solving Means A high-pressure fuel injection pipe which has, in a connection end portion of a thick-walled and small-diametrical steel pipe, a connection head portion comprising a seat face, an annular flange portion, and a cylindrical face continuing into the seat faces 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 the annular flange portion toward the seat face formed such that a rear side opening angle ¸ to an axis of the pipe in the section in the axial direction of the pipe satisfies 0° < ¸ ¤ 20°, and furthermore 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 fillet portion on the side of the annular flange portion of the cylindrical face satisfies 0.33 ¤ h/H ¤ 0.85.",
  "title": "HIGH-PRESSURE FUEL INJECTION TUBE HAVING CONNECTION HEAD AND METHOD FOR PRODUCING THE SAME"
}