公开(公告)号：US10094346B1

公开(公告)日：2018-10-09

申请号：US15787024

申请日：2017-10-18

Applicant: MAGNETI MARELLI S.p.A.

Inventor： Daniele De Vita ,  Tommaso Neri

IPC: F02M59/02 ,  F02M59/46 ,  F02M37/04 ,  F02M55/00

Abstract: Fuel pump for a direct-injection system and having: a pumping chamber; a piston; an intake channel regulated by an intake valve; a delivery channel regulated by a delivery valve; and a drain channel that originates in the delivery channel and is regulated by a maximum-pressure valve having: a shutter, a valve body provided with a valve seat, a calibrated spring for pushing the shutter against the valve seat, and a plate that is arranged in contact with the shutter on the opposite side of the valve seat; the plate of the maximum-pressure valve has a first annular groove, which is arranged around the shutter; and the valve body of the maximum-pressure valve has a second annular groove, which is arranged around the shutter and at least partially faces the first annular groove of the plate.