IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
|
| 국제특허분류(IPC7판) |
|
| 출원번호 |
US-0502765
(1990-04-02)
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| 우선권정보 |
DE-3910793 (1989-04-04) |
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발명자
/ 주소 |
- Kohler Wolfgang (Cologne DEX) Rizk Reda (Cologne DEX) Michels Hans-Gottfried (Erftstadt DEX)
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| 출원인 / 주소 |
- Kloeckner-Humboldt-Deutz AG (Cologne DEX 03)
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| 인용정보 |
피인용 횟수 :
31 인용 특허 :
0 |
초록
▼
A fuel injection device for diesel engines, having at least one pump plunger (4), which is sealingly guided in a plunger bushing (5) and forms, together with said plunger bushing (5), a high-pressure space (11) that is connected to a low-pressure space (13) by means of a control element during the d
A fuel injection device for diesel engines, having at least one pump plunger (4), which is sealingly guided in a plunger bushing (5) and forms, together with said plunger bushing (5), a high-pressure space (11) that is connected to a low-pressure space (13) by means of a control element during the downward motion of the fuel pump plunger, said high-pressure space (11) being placed in free flow communication with an injection valve (49) via an injection line 48. The use of a continuously open flow connection between the high-pressure space 11 and the injection valve 49 minimizes dead space thereby permitting development of high injection pressures.
대표청구항
▼
A fuel injection device for diesel engines, comprising: a fuel injection pump having a one piece plunger bushing (5), including a plunger bore with a first end which is open for receiving a plunger and a second end, a high pressure hole (12) in said plunger bushing (5) at said second end of said bor
A fuel injection device for diesel engines, comprising: a fuel injection pump having a one piece plunger bushing (5), including a plunger bore with a first end which is open for receiving a plunger and a second end, a high pressure hole (12) in said plunger bushing (5) at said second end of said bore, said second end of said bore being closed except for said high pressure hole, a high pressure space (11) at said second end of said plunger bore, and wall means in said plunger bushing defining a stepped diameter bore, said stepped diameter bore extending transverse to and intersecting said high pressure hole closely adjacent to said high pressure space, a low pressure space (13) connected to said plunger bore at a substantial distance from said second end, a pump plunger (4) reciprocatably mounted in said plunger bore, a control valve bushing (17) having stepped diameter exterior surfaces in complimentary fitted relation with said stepped diameter bore in said plunger bushing, said control valve bushing having a stepped diameter interior bore including a large diameter portion and a small diameter portion and an axially facing sealing surface between said portions, a stepped diameter control valve body (22) having a large diameter portion and a small diameter portion in axial sliding engagement, respectively, with said stepped diameter interior bore of said control valve bushing and a control valve seat formed between said stepped diameter portions in axially confronting relation to said sealing surface, said control valve body being axially shiftable between a closed position in which said seat is in sealing engagement with said sealing surface and an open position in which said high pressure space is connected with said low pressure space, a return passage (15) interconnecting said small diameter portion of said stepped diameter bore with said low-pressure space (13), a spring operatively interposed between said control valve bushing (17) and control valve body (22) resiliently biasing the latter to its closed position wherein said seat engages said sealing surface, an injection valve (49) operable to inject fuel into an engine cylinder, a high-pressure fuel line (48) connecting said high pressure hole (12) with said injection valve (49), a liquid-filled damping space (33) at one axial end of said control valve bushing (17), an anchor polate (30) secured to an axial end of said control valve body (22) and disposed within said damping space (33), a choke hole (37) connecting said damping space (33) in free flow communication with said return passage (15), a venting line (39) connected to the highest point of said damping space (33), a pressurizing valve (40) connected to said venting line (39) having a relief pressure less than the pressure in said low-pressure space (13), and an electromagnetic actuating device operatively associated with said control valve body and selectively operative upon actuation to move said valve body to its open position in opposition to said spring, said anchor plate and damping space, valve body, valve bushing, spring and choke hole being proportioned and arranged to effect a recoilless seating of said valve body seat on said sealing surface.
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