Fuel pump for a direct injection system with a better hydraulic sealing of the intake valve
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02M-059/44
F02M-059/36
F02M-063/02
F02M-059/06
F02M-059/10
F02M-059/02
F02M-059/20
F02M-059/46
F16K-001/32
F16K-031/06
출원번호
US-0139542
(2016-04-27)
등록번호
US-9856844
(2018-01-02)
우선권정보
IT-BO2015A0211 (2015-04-28)
발명자
/ 주소
Petrone, Michele
Vezzani, Enrico
Mattioli, Massimo
출원인 / 주소
MAGNETI MARELLI S.p.A.
대리인 / 주소
Howard & Howard Attorneys PLLC
인용정보
피인용 횟수 :
0인용 특허 :
1
초록▼
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 hous
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.
대표청구항▼
1. A fuel pump (4) for a direct injection system (1) provided with a common rail (3); the fuel pump (4) comprises: a pumping chamber (14) defined in a main body (12);a piston (15), which is mounted in a sliding manner on the inside of the pumping chamber (14) so as to cyclically vary the volume of t
1. A fuel pump (4) for a direct injection system (1) provided with a common rail (3); the fuel pump (4) comprises: a pumping chamber (14) defined in a main body (12);a piston (15), which is mounted in a sliding manner on the inside of the pumping chamber (14) so as to cyclically vary the volume of the pumping chamber (14);an intake channel (17), which originates from a wall of the pumping chamber (14) and has a housing portion (28), which is arranged in the area of the pumping chamber (14);an intake valve (18), which is inserted into the housing portion (28) of the intake channel (17);a delivery channel (19), which originates from a wall of the pumping chamber (14);a delivery valve (20), which is arranged along the delivery channel (19) in the area of the pumping chamber (14);a locking ring nut (30) with an annular shape, which is threaded and is screwed into the housing portion (28) of the intake channel (17) so as to strike against the intake valve (18);wherein the housing portion (28) of the intake channel (17) has an annular abutment (29), which reduces the diameter of the housing portion (28) and against which the intake valve (18) strikes;the fuel pump (4) is characterized in that:the intake valve (18) is made of a metal material having a greater hardness than the metal material of which the annular abutment (29) is made; andthe locking ring nut (30) is screwed into the housing portion (28) of the intake channel (17) with a tightening force that is sufficient to determine a plastic deformation of the annular abutment (29) against the intake valve (18). 2. A fuel pump (4) according to claim 1, wherein: the intake valve (18) comprises a disc (25) having a series of feeding through holes (26), through which fuel can flow, and a flexible lamina (27), which rests against a base of the disc (25), thus closing the passage through the feeding holes (26); andthe flexible lamina (27) comprising an outer edge (32) with a circular shape, which rests against the annular abutment (29), thus determining the plastic deformation of the annular abutment (29). 3. A fuel pump (4) according to claim 2, wherein the flexible lamina (27) is made of a metal material having a greater hardness than the metal material of which the annular abutment (29) is made. 4. A fuel pump (4) according to claim 2, wherein the disc (25) of the intake valve (18) is made of a metal material having a greater hardness than the metal material of which the annular abutment (29) is made. 5. A fuel pump according to claim 2, wherein the flexible lamina (27) comprises a series of thin stems (33), which originate from the outer edge (32); and a shutter body (34), which is supported by the stems (33). 6. A fuel pump (4) according to claim 1, wherein an intermediate element, which acts as a bearing, is interposed between the locking ring nut (30) and the intake valve (18). 7. A fuel pump (4) according to claim 1, wherein the intake valve (18) is driven into the housing portion (28) of the intake channel (17). 8. A fuel pump (4) according to claim 1, wherein the locking ring nut (30) strikes against the intake valve (18) on the opposite side relative to the annular abutment (29). 9. A fuel pump (4) according to claim 1, wherein the intake valve (18) strikes, on one side, against the annular abutment (29) of the housing portion (28) and, on the opposite side, against the locking ring nut (30).
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이 특허에 인용된 특허 (1)
Nuti Marco (Pisa ITX), Two-stroke internal combustion engine, with fuel injection and controlled ignition.
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