| 摘要 |
Provided is a common rail that can prevent cracking in the edges of branched hole openings of a fuel retaining hole without performing autofrettage for applying compressive residual stress to an internal surface of a common rail main body. The common rail is characterized in comprising a fuel retaining hole which is a columnar space provided inside the rail main body and capable of retaining high-pressure fuel, and a plurality of branching holes that each branch out of the rail main body from the fuel retaining hole, wherein the branching directions of the branching holes are split in two directions as seen from the axial direction of the fuel retaining hole, and the center axes of the branching holes that branch in one direction and the branching holes that branch in the other direction are disposed at angles so as to not face each other. |
