Patent ID: 6494183
Filing Date: 2002-12-17
Classification: F02M

Abstract:
A common rail for a diesel engine comprising:a main pipe rail having an axial peripheral wall and a circulating passage extending inside the axial peripheral wall in the axial direction thereof and defining an inner circumferential surface; branch holes formed through the axial peripheral wall of the main pipe rail; and branch connectors connected to the main pipe rail at the respective branch holes, a Ni-diffused fatigue strength reinforcing layer formed by plating a Ni layer on at least a portion of the inner circumferential surface of the main pipe rail and heating the main pipe rail sufficiently so that the Ni plated layer is diffused into the axial peripheral wall, thereby reducing a difference in hardness and elongation properties between non-metal inclusions and steel surfaces in portions of the axial peripheral wall adjacent the inner circumferential surface.