Patent ID: 6263862
Filing Date: 2001-07-24
Classification: B21C,F16L

Abstract:
A common rail comprising:a block rail having a peripheral wall with an outer surface and a communication passage extending through the block rail, at least one branch hole extending through the peripheral wall of the block rail from the communication passage to the outer surface, the branch hole being formed to define a pressure receiving seat between said communication passage and said outer surface, said pressure receiving seat opening and facing outwardly on said block rail;at least one branch pipe having an end and a connection head extending from the end, the end of the branch pipe defining a pressing surface configured for engaging the pressure receiving seat of the branch hole in the block rail;a fastening nut engaged around the branch pipe adjacent the connecting head, the fastening nut being fastened to the common rail in the branch hole for urging the end of the branch pipe into the pressure receiving seat of the branch hole; andwherein the peripheral wall of the block rail includes a compression residual stress at locations on the peripheral wall adjacent the communication passage and surrounding the branch hole.