IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0869162
(2000-10-12)
|
우선권정보 |
DE-0051144 (1999-10-23) |
국제출원번호 |
PCT/DE00/03582
(2000-10-12)
|
국제공개번호 |
WO01/31192
(2001-05-03)
|
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
4 인용 특허 :
5 |
초록
An injector, actuated by a piezoelectric actuator with a hydraulic booster, for a fuel injection system for internal combustion engines is disclosed, in which the pressure booster is always hydraulically prestressed.
대표청구항
▼
1. An injector for a fuel injection system for internal combustion engines, comprising a pressure booster ( 19 ) having a first piston ( 9 ) guided in a first guide bore ( 5 ) and a second piston ( 11 ) guided in a second guide bore ( 7 ), wherein the first piston ( 9 ) and the second piston ( 11 )
1. An injector for a fuel injection system for internal combustion engines, comprising a pressure booster ( 19 ) having a first piston ( 9 ) guided in a first guide bore ( 5 ) and a second piston ( 11 ) guided in a second guide bore ( 7 ), wherein the first piston ( 9 ) and the second piston ( 11 ) define a pressure chamber ( 17 ) that is under at least a supply pressure, and having a leaking oil return line ( 25 ), wherein the first piston ( 9 ) is actuated by an actuator ( 21 ) and the second piston ( 11 ) at least indirectly actuates the final control element ( 15 ) of a control valve, said second guide bore ( 7 ) communicates hydraulically with said leaking oil return ( 25 ), the pressure p 1 in the leaking oil return ( 25 ) being lower than the supply pressure. 2. The injector of claim 1, wherein the first guide bore ( 5 ), the first piston ( 9 ) and the housing ( 1 , 3 ) are sealed off from their surroundings. 3. The injector of claim 2, further comprising a bellows ( 33 ) sealing off said first guide bore ( 5 ), said first piston ( 9 ) and said housing ( 1 , 3 ) from their surroundings. 4. The injector of claim 2, wherein the supply pressure in the pressure chamber ( 17 ) is furnished by a supply line ( 31 ) discharging into the chamber ( 34 ) formed by the housing ( 1 , 3 ), bellows ( 33 ) and first piston. 5. The injector of claim 1, further comprising a pressure holding valve ( 37 ) disposed in the supply line ( 31 ). 6. The injector of claim 5, wherein said pressure holding valve ( 37 ) limits the pressure p 2 in the supply line ( 31 ) to about 50 bar. 7. The injector of claim 1, further comprising a recess ( 29 ) which is in communication with the leaking oil return ( 25 ) is present at the second guide bore ( 7 ). 8. The injector of claim 1, wherein said second piston ( 11 ) actuates the final control element ( 15 ) of the control valve via a tappet ( 13 ). 9. The injector of claim 1, wherein the control valve discharges into the leaking oil return ( 25 ). 10. The injector of claim 1, wherein the actuator is a piezoelectric actuator ( 21 ). 11. The injector of claim 1, wherein the housing ( 1 , 3 ), the control valve, and the actuator ( 21 ) are mounted in a retaining body ( 35 ). 12. A fuel injection system for internal combustion engines, including a high-pressure fuel pump, a high pressure fuel reservoir, and at least one injector said injector comprising a pressure booster ( 19 ) having a first piston ( 9 ) guided in a first guide bore ( 5 ) and a second piston ( 11 ) guided in a second guide bore ( 7 ), wherein the first piston ( 9 ) and the second piston ( 11 ) define a pressure chamber ( 17 ) that is under at least a supply pressure, and having a leaking oil return line ( 25 ), wherein the first piston ( 9 ) is actuated by an actuator ( 21 ) and the second piston ( 11 ) at least indirectly actuates the final control element ( 15 ) of a control valve, said second guide bore ( 7 ) communicates hydraulically with said leaking oil return ( 25 ), the pressure p 1 in the leaking oil return ( 25 ) being lower than the supply pressure. 13. The injector of claim 3, wherein the supply pressure in the pressure chamber ( 17 ) is furnished by a supply line ( 31 ) discharging into the chamber ( 34 ) formed by the housing ( 1 , 3 ), bellows ( 33 ) and first piston. 14. The injector of claim 4, further comprising a pressure holding valve ( 37 ) disposed in the supply line ( 31 ). 15. The injector of claim 13, further comprising a pressure holding valve ( 37 ) disposed in the supply line ( 31 ). 16. The injector of claim 13, wherein said pressure holding valve ( 37 ) limits the pressure p 2 in the supply line ( 31 ) to about 50 bar. 17. The injector of claim 2, further comprising a recess ( 29 ) which is in communication with the leaking oil return ( 25 ) is present at the second guide bore ( 7 ). 18. The injector of claim 2, wherein said second piston ( 11 ) actuates the final control element ( 15 ) of the control val ve via a tappet ( 13 ). 19. The injector of claim 2, wherein the control valve discharges into the leaking oil return ( 25 ). 20. The injector of claim 4, wherein the actuator is a piezoelectric actuator ( 21 ). 21. The injector of claim 4, wherein the housing ( 1 , 3 ), the control valve, and the actuator ( 21 ) are mounted in a retaining body ( 35 ).
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