Patent ID: 7318418

Claim:
A common rail for a diesel engine comprising: a common rail body having an outer peripheral surface, a branch connection seat formed on the peripheral surface, at least a portion of the branch connection seat being substantially flat; a branching connection body having an end face, at least a portion of the end face of the branching connection body being substantially flat, the end face of the branching connection body being opposed to the branch connection seat of the common rail body; at least a portion of at least one of the branch connection seat of the common rail body and the end face of the branching connection body being non-planar and configured to define an annular gap between the branch connection seat and the end face; and a friction welding material securing at least part of the flat portion of the branch connection seat to at least part of the flat portion of the end face of the branching connection body to one another and substantially filling the gap for firmly fixing the branching connection body to the common rail body by friction welding.