公开(公告)号：US09822751B2

公开(公告)日：2017-11-21

申请号：US14847286

申请日：2015-09-08

Applicant: MAGNETI MARELLI S.p.A.

Inventor： Enrico Vezzani ,  Michele Petrone ,  Luca Mancini

IPC: F02M63/02 ,  F16F1/04 ,  F02M59/06 ,  F02M59/10 ,  F04B1/04 ,  F04B53/10

CPC classification number: F02M63/0265 ,  F02M59/06 ,  F02M59/102 ,  F02M2200/02 ,  F04B1/0426 ,  F04B1/0452 ,  F04B53/1002 ,  F16F1/047

Abstract: Fuel pump for a direct injection system provided with a common rail. The fuel pump has a pumping chamber defined in a main body; a piston which is mounted in a sliding manner inside the pumping chamber to cyclically vary the volume of the pumping chamber; an intake channel which originates from a wall of the pumping chamber; an intake valve which is coupled to the intake channel; a delivery channel which originates from a wall of the pumping chamber; a delivery valve which is coupled to the delivery channel; and an actuating spring which has a plurality of turns having a pitch that varies between the turns and that is coupled to the piston so as to push the piston towards a maximum volume or minimum volume position of the pumping chamber.

公开(公告)号：US09856844B2

公开(公告)日：2018-01-02

申请号：US15139542

申请日：2016-04-27

Applicant: MAGNETI MARELLI S.p.A.

Inventor： Michele Petrone ,  Enrico Vezzani ,  Massimo Mattioli

IPC: F02M59/44 ,  F02M59/36 ,  F02M63/02 ,  F02M59/06 ,  F02M59/10 ,  F02M59/02 ,  F02M59/20 ,  F02M59/46 ,  F16K1/32 ,  F16K31/06

CPC classification number: F02M59/442 ,  F02M59/02 ,  F02M59/06 ,  F02M59/102 ,  F02M59/20 ,  F02M59/367 ,  F02M59/462 ,  F02M63/0265 ,  F02M2200/16 ,  F02M2200/26 ,  F02M2200/8053 ,  F02M2200/8061 ,  F02M2200/8076 ,  F16K1/32 ,  F16K31/06

Abstract: A fuel pump for a direct injection system having: a pumping chamber; a piston, which is mounted in a sliding manner on the inside of the pumping chamber; an intake channel, which originates from a wall of the pumping chamber and has a housing portion; an intake valve, which is inserted into the housing portion of the intake channel; and a locking ring nut with an annular shape, which is threaded and is screwed into the housing portion of the intake channel so as to strike against the intake valve; the housing portion has an annular abutment, which reduces the diameter of the housing portion and against which the intake valve strikes; the locking ring nut is screwed into the housing portion with a tightening force that is sufficient to determine a plastic deformation of the annular abutment against the intake valve.