| 摘要 |
<p>A fuel pump (4) for a direct injection system having: at least one pumping chamber (14); a piston (15) which is mounted sliding inside the pumping chamber (14) in order to vary cyclically the volume of the pumping chamber (14); an intake duct (17) connected to the pumping chamber (14) and regulated by an inlet valve (18); a delivery duct (19) connected to the pumping chamber (14) and regulated by a one-way delivery valve (20) which allows exclusively a fuel flow outgoing from the pumping chamber (14); and a damping device (36), which is placed along the intake duct (17) upstream of the inlet valve (18), and comprises at least one elastically deformable damping body (39) that has internally a closed chamber (43) filled with pressurized gas and composed of two metal plates (44, 45) cup shaped and welded together at their annular edges (51, 52) by an annular weld (47) without interruptions.</p> |
