IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0428967
(2009-04-23)
|
등록번호 |
US-8393881
(2013-03-12)
|
우선권정보 |
JP-2008-114758 (2008-04-25) |
발명자
/ 주소 |
- Usui, Satoshi
- Tamura, Shingo
- Miyazaki, Katsumi
- Takahashi, Sunao
- Suganami, Masayuki
- Hashida, Minoru
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
10 인용 특허 :
7 |
초록
▼
A mechanism for reducing pressure pulsation includes a pair of metal dampers formed by joining two disk-shaped metal diaphragms over an entire circumference and forming a hermetically sealed space inside a joined portion, with gas being sealed in the aforementioned hermetically sealed space of the d
A mechanism for reducing pressure pulsation includes a pair of metal dampers formed by joining two disk-shaped metal diaphragms over an entire circumference and forming a hermetically sealed space inside a joined portion, with gas being sealed in the aforementioned hermetically sealed space of the damper, has a pair of pressing members which give pressing forces to both outer surfaces of the aforementioned metal dampers at a position at an inner diameter side from the joined portion, and is unitized with the pair of pressing members being connected in a state in which they sandwich the metal damper.
대표청구항
▼
1. A pressure pulsation reducing mechanism to be contained in a damper chamber, arranged on a low-pressure fuel path extending to a pressure chamber of a high-pressure fuel supply pump and disposed between a housing of the pump and a damper cover, comprising: a metal damper including a pair of disk-
1. A pressure pulsation reducing mechanism to be contained in a damper chamber, arranged on a low-pressure fuel path extending to a pressure chamber of a high-pressure fuel supply pump and disposed between a housing of the pump and a damper cover, comprising: a metal damper including a pair of disk-shaped metal diaphragms joined with each other at their outer peripheries to form therein a sealed chamber filled with gas, anda pair of pressing members between which the metal damper is clamped at its radially inner side with respect to the outer peripheries to apply a pressing force to each of the outer surfaces of the metal damper, said pressing members and said pair of disk-shaped metal diaphragms together forming a unitized damper unit receivable in the damper chamber. 2. The pressure pulsation reducing mechanism according to claim 1, wherein the outer surfaces of the metal damper are arranged in the damper chamber to be exposed to the fuel flowing in the damper chamber. 3. The pressure pulsation reducing mechanism according to claim 1, wherein the pressing members of the pair have respective uninterrupted annular surfaces pressing the outer surfaces of the metal damper respectively to be clamped therebetween, respective curved surfaces extending from the annular surfaces respectively, and respective cylindrical parts, one of which cylindrical parts has an inner circumferential surface extending from one of the curved surfaces, and the other one of which cylindrical parts has an outer circumferential surface extending from the other one of the curved surfaces, and the inner and outer circumferential surfaces face to each other and are joined with each other to be united with each other. 4. The pressure pulsation reducing mechanism according to claim 3, wherein the pair of pressing members form at least one of a communication path between at least one of the cylindrical parts and an inner wall surface of the damper chamber and a communication path on at least one of the cylindrical parts to enable the fuel flow between radially inner and outer sides of the cylindrical parts. 5. The pressure pulsation reducing mechanism according to claim 3, wherein a surface of a relatively radially outer one of the pressing members of the pair and a surface of a relatively radially inner one of the pressing members of the pair form an annular space containing therein the outer peripheries joined with each other. 6. The pressure pulsation reducing mechanism according to claim 3, wherein a relatively radially outer one of the pressing members of the pair has an outer surface extending to be pressed against an inner wall surface of a cover member forming the damper chamber with a path member forming the low-pressure fuel path, and the cylindrical part of one of relatively radially inner one of the pressing members of the pair and the relatively radially outer one of the pressing members of the pair has an end surface opposed to the outer surface to be pressed against an inner wall surface of the low-pressure fuel path. 7. The pressure pulsation reducing mechanism according to claim 6, wherein the relatively radially outer one of the pressing members forms a space between the cover member and the relatively radially outer one of the pressing members to enable the fuel to flow between radially inner and outer sides of the relatively radially outer one of the pressing members. 8. The pressure pulsation reducing mechanism according to claim 6, wherein one of the metal diaphragms adapted to face to the cover member is arranged to face to a fuel introducing port arranged on the cover member, and the other one of the metal diaphragms adapted to face to an inner wall surface of the damper chamber is arranged to face to a fuel discharge port arranged on the damper chamber. 9. The pressure pulsation reducing mechanism according to claim 6, wherein the pressure pulsation reducing mechanism is pressed against a bottom wall surface of the damper chamber by a part of a fitting force between the cover member and an outer circumferential surface surrounding the damper chamber. 10. The pressure pulsation reducing mechanism according to claim 1, wherein the pressing members of the pair are fixed to each other by press-fitting to clamp the metal diaphragms therebetween. 11. The pressure pulsation reducing mechanism according to claim 1, wherein said pressing members are immovable with respect to each other. 12. A high-pressure fuel supply pump comprising: a pump body including a pressure chamber, a partition member mounted on the pump body and including a damper chamber, disposed between a housing of the pump body and a damper cover of the pump body, a low-pressure fuel path for supplying therethrough the pressure chamber, and a damper mechanism for reducing fuel pressure pulsation contained in the damper chamber, the pressure pulsation reducing damper mechanism having a metal damper including a pair of disk-shaped metal diaphragms joined with each other at their peripheries to form therein a sealed chamber filled with gas, anda pair of pressing members between which the metal damper is clamped at its radially inner side with respect to the peripheries to apply a pressing force to each of outer surfaces of the metal damper, said pressing members and said pair of disk-shaped metal diaphragms together forming a unitized damper unit receivable in the damper chamber. 13. The high-pressure fuel supply pump according to claim 12, wherein the outer surfaces of the metal damper are arranged in the damper chamber to be exposed to a fuel flowing from a fuel introducing joint mounted on the pump body into the pressure chamber through the damper chamber. 14. The high-pressure fuel supply pump according to claim 12, wherein the pressing members of the pair have respective uninterrupted annular surfaces pressing the outer surfaces of the metal damper respectively to be clamped therebetween, respective curved surfaces extending from the annular surfaces respectively, and respective cylindrical parts, one of which cylindrical parts has an inner circumferential surface extending from one of the curved surfaces, and the other one of which cylindrical parts has an outer circumferential surface extending from the other one of the curved surfaces, and the inner and outer circumferential surfaces face to each other and are joined with each other to be united with each other. 15. The high-pressure fuel supply pump according to claim 14, wherein the pair of pressing members form at least one of a communication path between at least one of the cylindrical parts and an inner wall surface of the damper chamber and a communication path on at least one of the cylindrical parts to enable the fuel flow between radially inner and outer sides of the cylindrical parts. 16. The high-pressure fuel supply pump according to claim 14, wherein the curved surface of a relatively radially outer one of the pressing members of the pair and the curved surface of a relatively radially inner one of the pressing members of the pair form an annular space containing therein the outer peripheries joined with each other. 17. The high-pressure fuel supply pump according to claim 16, further comprising a cover member forming the damper chamber with the pump body, wherein the relatively radially outer one of the pressing members of the pair has an outer surface extending to be pressed against an inner wall surface of the cover member, and the cylindrical part of one of the relatively radially inner one of the pressing members of the pair and the relatively radially outer one of the pressing members of the pair has an end surface opposed to the outer surface to be pressed against an inner wall surface of the damper chamber so that the metal damper is mounted in the damper chamber. 18. The high-pressure fuel supply pump according to claim 17, wherein the relatively radially outer one of the pressing members forms a space between the cover member and the relatively radially outer one of the pressing members to enable the fuel to flow between radially inner and outer sides of the relatively radially outer one of the pressing members. 19. The high-pressure fuel supply pump according to claim 17, wherein one of the metal diaphragms adapted to face to the cover member is arranged to face to a fuel introducing port arranged on the cover member, and the other one of the metal diaphragms adapted to face to a bottom wall surface of the damper chamber is arranged to face to a fuel discharge port arranged on the bottom wall surface of the damper chamber. 20. The high-pressure fuel supply pump according to claim 17, wherein the pressure pulsation reducing mechanism is pressed against a bottom wall surface of the damper chamber by a part of a fitting force between the cover member and an outer circumferential surface of the pump body surrounding the damper chamber. 21. The high-pressure fuel supply pump according to claim 12, wherein the pressing members of the pair are fixed to each other by press-fitting to clamp the metal diaphragms therebetween. 22. The high-pressure fuel supply pump according to claim 12, wherein said pressing members are immovable with respect to each other.
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