Patent ID: 6213095
Filing Date: 2001-04-10
Classification: B21C,F02M

Abstract:
A common rail comprising:a main pipe rail having a peripheral wall extending in an axial direction;a main flow path inside the peripheral wall of the main pipe rail and extending in the axial direction; andat least one boss provided on the peripheral wall of the main pipe rail, said boss including a branch hole communicated with the main flow path and having a pressure receiving seat opened outwardly;a branch pipe having a branch flow path communicating with the main flow path, said branch pipe including a connection head with a pressing face at an end of the branch pipe;a fastening nut mounted to the branch pipe and fastened to the boss for urging the pressing face of the branch pipe into contact with the pressure receiving seat of the boss to press portions of the main pipe rail right under the connection head; andwherein the main pipe includes a compressive residual stress at locations in the peripheral wall where the main flow path of the main pipe rail communicates with the branch hole.