IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0442203
(2003-05-21)
|
우선권정보 |
JP-2002-149949(2002-05-24) |
발명자
/ 주소 |
- Abe,Masami
- Yamada,Hiroyuki
- Onose,Toru
- Saito,Atsuji
- Usui,Satoshi
- Kotaki,Masayoshi
- Odakura,Hiroshi
|
출원인 / 주소 |
- Hitachi, Ltd.
- Hitachi Car Engineering Co., Ltd.
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
14 인용 특허 :
5 |
초록
▼
A simple structured high-pressure fuel pump. A fuel pump comprises a reciprocably-supported cylinder, a pressurizing chamber using part of the outer surface of the cylinder as the wall surface which move to change the internal volume, a fuel intake passage forming a fuel passage which introduces fue
A simple structured high-pressure fuel pump. A fuel pump comprises a reciprocably-supported cylinder, a pressurizing chamber using part of the outer surface of the cylinder as the wall surface which move to change the internal volume, a fuel intake passage forming a fuel passage which introduces fuel to the pressurizing chamber, a fuel discharge passage for the compressed fuel coming out from the pressurizing chamber. A fuel intake valve is provided in fuel intake passage. A fuel discharge valve is provided in said fuel discharge passage. A connecting passage connects upstream side of the intake valve in the fuel intake passage and the downstream side of it. A check valve which flows fuel from the fuel discharge flow passage to the fuel intake passage is provided in the connecting passage.
대표청구항
▼
What is claimed is: 1. A fuel pump comprising: a cylinder formed in a pump body, a reciprocating plunger installed in the cylinder, a pressurizing chamber formed by the cylinder and the plunger, and whose internal volume varies with reciprocating motion of the plunger, a fuel intake passage for fee
What is claimed is: 1. A fuel pump comprising: a cylinder formed in a pump body, a reciprocating plunger installed in the cylinder, a pressurizing chamber formed by the cylinder and the plunger, and whose internal volume varies with reciprocating motion of the plunger, a fuel intake passage for feeding fuel into the pressurizing chamber, a fuel discharge passage for feeding out the fuel pressured by the pressurizing chamber, a fuel intake valve provided in the fuel intake passage, and a fuel discharge valve provided in the fuel discharge passage, and a connecting passage for connecting between the upstream side of the intake valve in the fuel intake passage and the downstream side of the discharge valve in the fuel discharge passage, wherein the connecting passage is provided with a check valve for allowing the fuel to pass from the fuel discharge flow passage to the fuel intake passage, and the connecting passage is comprised of a check valve-mounting hole which is bored into the pump body from an outer surface of the pump body. 2. The fuel pump of claim 1, wherein said check valve works as a relief valve that allows the fuel to pass from said fuel discharge passage to said fuel intake passage when the fuel pressure in the fuel discharge passage exceeds a preset value. 3. The fuel pump of claim 1, wherein said pump contains a joint of said fuel intake passage and said connecting passage and a joint of said fuel discharge passage and said connecting passage, and the joints are located inside of said pump body. 4. The fuel pump of claim 3, wherein said fuel intake passage, said fuel discharge passage, and said connecting passage are provided in an identical metal or a plastic block. 5. The fuel pump of claim 1, wherein said fuel intake passage and said fuel discharge passage are placed in parallel to each other; a connecting passage is provided approximately perpendicularly to these passages to connect these passages with each other; and said check valve works as a relief valve for the discharged passage pressure relief. 6. The fuel pump of claim 1, wherein an orifice is provided in a flow passage between said fuel discharge passage and said check valve. 7. The fuel pump of claim 6, wherein a fuel chamber to be part of a flow passage is provided between said orifice and said relief valve. 8. The fuel pump of claim 6, wherein a damper whose volume varies by fuel pressure is provided in contact with fuel between said orifice and said relief valve. 9. The fuel pump of claim 1, wherein both ends of said connecting passage are provided with plug-mounting holes on the outer surface of the pump body; one of said plug-mounting holes is equipped with a first blind plug for preventing fuel from flowing out from said connecting passage to the outside of the pump; another thereof is equipped with a second blind plug, said check valve serving as a relief valve, and a sealing section for blocking fuel passage between the intake side and the discharge side except the place of said relief valve. 10. The fuel pump of claim 9, wherein said first blind plug and said second blind plug are mounted in a single body as said pump body. 11. The fuel pump of claim 9, wherein the sealing section of said first blind plug is a rubber contact seal and the sealing section of said second blind plug is a metal contact seal. 12. The fuel pump of claim 5, wherein said connecting passage and said fuel intake passage are disposed with their center lines offset and intersected with each other, and said check valve is placed on the intersection of said passages. 13. A fuel pump comprising a fuel intake passage, a fuel discharge passage, a fuel intake valve provided in said fuel intake passage, a fuel discharge valve provided in said discharge passage, a pressurizing chamber provided between said intake valve and said discharge valve, a mechanism for metering fuel discharged from said pressurizing chamber, and a connecting passage provided between the upstream side of said fuel intake valve and the downstream side of said discharge valve, wherein the connecting passage is provided with a relief valve for allowing the fuel from the fuel discharge valve to the fuel intake valve, and the connecting passage is comprised of a relief valve-mounting hole which is bored into the pump body from an outer surface of the pump body. 14. The fuel pump of claim 10, wherein the sealing section of said first blind plug is a rubber contact seal and the sealing section of said second blind plug is a metal contact seal. 15. A fuel pump comprising: a cylinder formed in a pump body, a reciprocating plunger installed in the cylinder, a pressurizing chamber formed by the cylinder and the plunger, and whose internal volume varies with the reciprocating motion of the plunger, a fuel intake passage for feeding fuel into the pressurizing chamber, a fuel discharge passage for feeding out the fuel pressurized by the pressurizing chamber, a fuel intake valve provided in the fuel intake passage, a fuel discharge valve provided in the fuel discharge passage, and a connecting passage for connecting between the upstream side of the fuel intake valve in the fuel intake passage and the downstream side of the fuel discharge valve in the fuel discharge passage, wherein the connecting passage is provided with a check valve for allowing the fuel to pass from the fuel discharge valve to the fuel intake valve, and wherein both ends of said connecting passage are provided with plug-mounting holes on the outer surface of the pump body; one of the said plug-mounting holes is equipped with a first blind plug for preventing fuel from flowing out from said connecting passage to the outside of the pump; another thereof is equipped with a second blind plug, said check valve serving as a relief valve for the discharged passage pressure relief, and a sealing section for blocking fuel passage between the intake side and the discharge side except the place of said relief valve. 16. A fuel pump comprising: a cylinder formed in a pump body, a reciprocating plunger installed in the cylinder, a pressurizing chamber formed by the cylinder and the plunger, and whose internal volume varies with reciprocating motion of the plunger, a fuel intake passage for feeding fuel into the pressurizing chamber, a fuel discharge passage for feeding out the fuel pressurized by the pressurizing chamber, a fuel intake valve provided in the fuel intake passage, and a fuel discharge valve provided in the fuel discharge passage, and a connecting passage for connecting between the upstream side of the fuel intake valve in the fuel intake passage and the downstream side of the fuel discharge valve in the fuel discharge passage, wherein the connecting passage is provided with a check valve for allowing the fuel to pass from the fuel discharge valve to the fuel intake valve, wherein both ends of said connecting passage are provided with plug-mounting holes on the outer surface of the pump body; one of said plug-mounting holes is equipped with a first blind plug for preventing fuel from flowing out from said connecting passage to the outside of the pump; another thereof is equipped with a second blind plug, said check valve serving as a relief valve for the discharged passage pressure relief, and a sealing section for blocking fuel passage between the intake side and the discharge side except the place of said relief valve, and wherein said first blind plug and said second blind plug are mounted in a single body as said pump body. 17. The fuel pump of claim 15, wherein the sealing section of said first blind plug is a rubber contact seal and the sealing section of said second blind plug is a metal contact seal. 18. The fuel pump of claim 16, wherein the sealing section of said first blind plug is as rubber contact seal and the sealing section of said second blind plug is a metal contact seal.
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