Patent ID: 8672653

Claim:
A fuel pump for a direct injection system comprising: at least one pumping chamber; a piston which is mounted sliding inside the pumping chamber in order to vary cyclically the volume of the pumping chamber; an intake duct connected to the pumping chamber and regulated by an inlet valve; a delivery duct connected to the pumping chamber and regulated by a one-way delivery valve which allows exclusively a fuel flow outgoing from the pumping chamber; and a damping device, which is placed along the intake duct upstream of the inlet valve, and comprises at least one elastically deformable damping body that has internally a closed chamber and is composed of two metal plates cup shaped and welded together in correspondence of their annular edges by an annular weld without interruptions; wherein in the damping body the annular weld is created in a middle area of the annular edges of the plates so as to be at some distance from the outer ends of the annular edges themselves; and wherein the annular edges of the plates have different shapes and sizes; a first annular edge of a first plate is larger than a second annular edge of a second plate and is bent into a “U” shape to embrace on both sides the second annular edge of the second plate.