Patent ID: 6050611
Filing Date: 2000-04-18
Classification: F02M,F16L,Y10S

Abstract:
A common rail comprising a main pipe rail having a peripheral wall with inner and outer peripheral surfaces, said inner peripheral surface being substantially cylindrically generate along a major portion of said main pipe rail and defining a main communication passage through said main pipe rail, at least one branch hole formed through said peripheral wall and extending substantially radially from the inner peripheral surface to the outer peripheral surface, portions of the branch hole adjacent the outer peripheral surface being flaired outwardly to define a pressure-receiving seat surface, a substantially tubular joint portion provided on the main pipe rail and extending substantially radially outwardly and having an axis substantially concentric with the branch hole, the joint portion being formed with an array of threads, at least one branch pipe having an end and a branch communication passage extending from the end, the end of the branch pipe defining and enlarged connection head portion having a pressing seat surface adjacent the end and having a neck facing from the end, the branch pipe being disposed substantially concentrically within the tubular point portion such that the pressing seat surface of the branch pipe is engaged with the pressure-receiving seat surface of the branch hole and such that the branch communication passage of the branch pipe is substantially axially aligned with the branch hole of the main pipe rail, a nut engage over portions of the branch pipe adjacent the enlarged connection head portion thereof, the nut having an array of threads engaged with the threads of the joint portion, the nut further having an end engaged with the neck portion of the branch pipe for tightly urging the pressing seat surface of branch pipe against the pressure-receiving seat surface of the main pipe rail, wherein portions of the inner peripheral surface of the main pipe rail surrounding the branch hole are flatted, the flatted portion of the inner peripheral surface intersecting the substantially cylindrical generated portions of the inner peripheral surface.