IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0593146
(2000-06-14)
|
우선권정보 |
JP-0055337 (2000-03-01) |
발명자
/ 주소 |
- Onishi, Yoshihiko
- Miyajima, Masayasu
|
출원인 / 주소 |
- Mitsubishi Denki Kabushiki Kaisha
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
7 인용 특허 :
11 |
초록
▼
A variable delivery fuel supply device capable of obtaining a stable fuel supply without causing noises resulted from the operation of the electromagnetic valve or a defect of the strength of a supply passage for flowing fuel of low pressure, which comprises fuel injection valves 1a-1d for injecting
A variable delivery fuel supply device capable of obtaining a stable fuel supply without causing noises resulted from the operation of the electromagnetic valve or a defect of the strength of a supply passage for flowing fuel of low pressure, which comprises fuel injection valves 1a-1d for injecting fuel to respective cylinders of an internal combustion engine, a fuel pump 3 which sucks fuel from a fuel intake port 13 through an intake valve 15 into a pressurizing chamber 24 by a reciprocating movement of a plunger 22 in a cylinder 21 to pressurize the fuel and supplies the pressurized fuel into the fuel injection valves 1a14 1d through a discharge valve 16, a damper chamber 29 having a pressure damper 30, which is communicated with the fuel passage 14 at a position between the fuel intake port 13 and the intake valve 15 in the fuel pump 3, a relief passage 20 for communicating the pressurizing chamber 24 with the fuel passage 14 in the fuel pump 3 and an electromagnetic valve 19 for opening and closing the relief passage 20, which is adapted to control an amount and a pressure of pressurized fuel to be supplied to the fuel injection valves by relieving pressurized fuel in the pressurizing chamber 24 to the fuel passage 14 at the time of opening the valve.
대표청구항
▼
1. A variable delivery fuel supply device which comprises:a fuel injection valve for injecting fuel to respective cylinders of an internal combustion engine, a fuel pump which sucks fuel from a fuel intake port through an intake valve into a pressurizing chamber by a reciprocating movement of a plun
1. A variable delivery fuel supply device which comprises:a fuel injection valve for injecting fuel to respective cylinders of an internal combustion engine, a fuel pump which sucks fuel from a fuel intake port through an intake valve into a pressurizing chamber by a reciprocating movement of a plunger in a cylinder to pressurize the fuel and supplies the pressurized fuel into the fuel injection valves through a discharge valve, a damper chamber having a pressure damper, which is communicated with the fuel passage at a position between the fuel intake port and the intake valve in the fuel pump, a relief passage for communicating the pressurizing chamber of the fuel pump with said fuel passage, and an electromagnetic valve for opening and closing the relief passage, which is adapted to control an amount of pressurized fuel to be supplied to the fuel injection valves by relieving pressurized fuel in the pressurizing chamber to said fuel passage at the time of opening the valve, wherein the damper chamber having a pressure damper is formed integrally with the fuel pump, and wherein the relief passage is communicated with the fuel passage between the damper chamber, including a pressure damper, and the intake valve. 2. A variable delivery fuel supply device which comprises:a fuel injection valve for injecting fuel to respective cylinders of an internal combustion engine, a fuel pump which sucks fuel from a fuel intake port through an intake valve into a pressurizing chamber by a reciprocating movement of a plunger in a cylinder to pressurize the fuel and supplies the pressurized fuel into the fuel injection valves through a discharge valve, a damper chamber having a pressure damper, which is communicated with the fuel passage at a position between the fuel intake port and the intake valve in the fuel pump, a relief passage for communicating the pressurizing chamber of the fuel pump with said fuel passage, and an electromagnetic valve for opening and closing the relief passage, which is adapted to control an amount of pressurized fuel to be supplied to the fuel injection valves by relieving pressurized fuel in the pressurizing chamber to said fuel passage at the time of opening the valve, wherein an orifice is formed in the relief passage, and wherein the orifice is disposed at the connecting point of the relief passage to the fuel passage between a location where the damper chamber communicates with the fuel passage and the intake valve. 3. A variable delivery fuel supply device which comprises:a fuel injection valve for injecting fuel to respective cylinders of an internal combustion engine, a fuel pump which sucks fuel from a fuel intake port through an intake valve into a pressurizing chamber by a reciprocating movement of a plunger in a cylinder to pressurize the fuel and supplies the pressurized fuel into the fuel injection valves through a discharge valve, a damper chamber having a pressure damper, which is communicated with the fuel passage at a position between the fuel intake port and the intake valve in the fuel pump, a relief passage for communicating the pressurizing chamber of the fuel pump with said fuel passage, and an electromagnetic valve for opening and closing the relief passage, which is adapted to control an amount of pressurized fuel to be supplied to the fuel injection valves by relieving pressurized fuel in the pressurizing chamber to said fuel passage at the time of opening the valve, wherein the damper chamber having a pressure damper is formed integrally with the fuel pump, wherein an orifice is formed in the relief passage, and wherein the orifice is disposed at the connecting point of the relief passage to the fuel passage between a location where the damper chamber communicates with the fuel passage and the intake valve. 4. A variable delivery fuel supply device which comprises:a fuel injection valve for injecting fuel to respective cylinders of an internal combustion engine, a fuel pump which sucks fuel from a fuel intake port through an intake valve into a pressurizing chamber by a reciprocating movement of a plunger in a cylinder to pressurize the fuel and supplies the pressurized fuel into the fuel injection valves through a discharge valve, a damper chamber having a pressure damper, which is communicated with the fuel passage at a position between the fuel intake port and the intake valve in the fuel pump, a relief passage for communicating the pressurizing chamber of the fuel pump with said fuel passage, and an electromagnetic valve for opening and closing the relief passage, which is adapted to control an amount of pressurized fuel to be supplied to the fuel injection valves by relieving pressurized fuel in the pressurizing chamber to said fuel passage at the time of opening the valve, wherein the relief passage is communicated with the fuel passage between the damper chamber including a pressure damper and the intake valve, wherein an orifice is formed in the relief passage, and wherein the orifice is disposed at the connecting point of the relief passage to the fuel passage between a location where the damper chamber communicates with the fuel passage and the intake valve. 5. A variable delivery fuel supply device which comprises:a fuel injection valve for injecting fuel to respective cylinders of an internal combustion engine, a fuel pump which sucks fuel from a fuel intake port through an intake valve into a pressurizing chamber by a reciprocating movement of a plunger in a cylinder to pressurize the fuel and supplies the pressurized fuel into the fuel injection valves through a discharge valve, a damper chamber having a pressure damper, which is communicated with the fuel passage at a position between the fuel intake port and the intake valve in the fuel pump, a relief passage for communicating the pressurizing chamber of the fuel pump with said fuel passage, and an electromagnetic valve for opening and closing the relief passage, which is adapted to control an amount of pressurized fuel to be supplied to the fuel injection valves by relieving pressurized fuel in the pressurizing chamber to said fuel passage at the time of opening the valve, wherein the relief passage is disposed such that fuel which is relieved enters into the fuel passage at a position downstream of the damper chamber. 6. The variable delivery fuel supply device according to claim 5, wherein the damper chamber having a pressure damper is formed integrally with the fuel pump.7. The variable delivery fuel supply device according to claim 5, wherein the relief passage is communicated with the fuel passage between the damper chamber including a pressure damper and the intake valve.8. The variable delivery fuel supply device according to claim 6, wherein the relief passage is communicated with the fuel passage between the damper chamber, including a pressure damper, and the intake valve.9. The variable delivery fuel supply device according to claim 5, wherein an orifice is formed in the relief passage.10. The variable delivery fuel supply device according to claim 6, wherein an orifice is formed in the relief passage.11. The variable delivery fuel supply device according to claim 7, wherein an orifice is formed in the relief passage.12. The variable delivery fuel supply device according to claim 5, wherein the pressure damper is formed of metallic bellows.13. The variable delivery fuel supply device according to claim 5, wherein the pressure damper is formed of a metallic diaphragm.14. The variable delivery fuel supply device according to claim 9, wherein the orifice is disposed at the connecting point of the relief passage to the fuel passage between a location where the damper chamber communicates with the fuel passage and the intake valve.15. The variable delivery fuel supply device according to claim 9, wherein the orifice formed in the relief passage is opened at a downstream side of the fuel passage with respect to the pressure damper.16. The variable delivery fuel supply device according to claim 10, wherein the orifice is disposed at the connecting point of the relief passage to the fuel passage between a location where the damper chamber communicates with the fuel passage and the intake valve.17. The variable delivery fuel supply device according to claim 10, wherein the orifice formed in the relief passage is opened at a downstream side of the fuel passage with respect to the pressure damper.18. The variable delivery fuel supply device according to claim 11, wherein the orifice is disposed at the connecting point of the relief passage to the fuel passage between a location where the damper chamber communicates with the fuel passage and the intake valve.19. The variable delivery fuel supply device according to claim 11, wherein the orifice formed in the relief passage is opened at a downstream side of the fuel passage with respect to the pressure damper.
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