A fuel supply device includes a subtank in a fuel tank, a fuel pump in the subtank having a first pump unit suctioning fuel in the subtank to supply fuel to an external equipment and a second pump unit suctioning fuel outside the subtank to pump fuel into the subtank, and a filter connected to a fir
A fuel supply device includes a subtank in a fuel tank, a fuel pump in the subtank having a first pump unit suctioning fuel in the subtank to supply fuel to an external equipment and a second pump unit suctioning fuel outside the subtank to pump fuel into the subtank, and a filter connected to a first suction port of the first unit and a second suction port of the second unit and filtering supply fuel supplied to the equipment and pump fuel pumped into the subtank. The filter includes a case, a first filter, and a second filter. The first filter in a first passage of the case directing fuel in the subtank into the first port filters the supply fuel. The second filter in a second passage of the case directing fuel outside the subtank into the second port filters the pump fuel.
대표청구항▼
What is claimed is: 1. A fuel supply device configured to supply fuel in a fuel tank to an external unit, the device comprising: a subtank accommodated in the fuel tank, the subtank storing a part of the fuel in the fuel tank; a fuel pump accommodated in the subtank, the fuel pump having a first pu
What is claimed is: 1. A fuel supply device configured to supply fuel in a fuel tank to an external unit, the device comprising: a subtank accommodated in the fuel tank, the subtank storing a part of the fuel in the fuel tank; a fuel pump accommodated in the subtank, the fuel pump having a first pump unit, which is configured to suction fuel in the subtank thereby to supply fuel to the external unit, and a second pump unit, which is configured to suction fuel outside the subtank thereby to pump fuel into the subtank; and a filter member that is connected to a first suction port of the first pump unit and a second suction port of the second pump unit and that is configured to filter the fuel supplied to the external unit and the fuel pumped into the subtank, wherein the filter member includes: a case having therein a partition wall, which defines a first flow passage and a second flow passage, wherein the first flow passage directs the fuel in the subtank into the first suction port and the second flow passage directs the fuel outside the subtank into the second suction port; a first filter element disposed in the first flow passage for filtering the fuel supplied to the external unit; and a second filter element disposed in the second flow passage for filtering the fuel pumped into the subtank. 2. The fuel supply device according to claim 1, wherein the case is attached on a bottom surface of the subtank such that: a first inlet of the first flow passage opens into the subtank; and a second inlet of the second flow passage projects from the bottom surface of the subtank into an outside of the subtank, and opens toward a bottom surface of the fuel tank. 3. The fuel supply device according to claim 2, wherein: the subtank has an opening on the bottom surface of the subtank; and the case is inserted into the opening so as to be fixed to the subtank. 4. The fuel supply device according to claim 3, wherein: the case has a flanged portion on a sidewall thereof, and an outer diameter of the flanged portion is larger than an outer diameter of the opening of the subtank; and the flanged portion is formed between the first inlet and the second inlet in a thickness direction of the flanged portion, and is brought into contact with the bottom surface of the subtank when the case is inserted into the opening. 5. The fuel supply device according to claim 2, wherein the first filter element is disposed in the first inlet, and the second filter element is disposed in the second inlet. 6. The fuel supply device according to claim 5, wherein: the second inlet has a fuel passage on a sidewall thereof, and an outside and an inside of the sidewall of the second inlet communicate through the fuel passage; and the second filter element is disposed to cover the second inlet and the fuel passage. 7. The fuel supply device according to claim 1, wherein: the first suction port and the second suction port of the fuel pump are formed at one end portion of the fuel pump; a first outlet of the first flow passage that is connected to the first suction port and a second outlet of the second flow passage that is connected to the second suction port are formed at an end portion of the case; and the end portion of the case is opposed to the one end portion of the fuel pump. 8. The fuel supply device according to claim 1, further comprising a check valve disposed in the second flow passage, wherein the check valve allows only a flow of fuel from an outside into an inside of the subtank. 9. The fuel supply device according to claim 8, wherein the check valve is disposed on a downstream side of the second filter element in a flow direction of fuel. 10. The fuel supply device according to claim 1 wherein: the case includes an upper casing, which has an upper partition wall, and a lower casing, which has a lower partition wall and is attached to the upper casing; and the upper partition wall and the lower partition wall constitute the partition wall when the upper casing and the lower casing are attached to each other to form the case. 11. The fuel supply device according to claim 10, wherein the upper casing and the lower casing are attached to each other by press fitting to form the case. 12. The fuel supply device according to claim 1, wherein a filtration area of the second filter element is larger than a filtration area of the first filter element. 13. A fuel supply device configured to supply fuel in a fuel tank to an external unit, the device comprising: a subtank accommodated in the fuel tank, the subtank storing a part of the fuel in the fuel tank; a fuel pump accommodated in the subtank, the fuel pump having a first pump unit, which is configured to suction fuel in the subtank thereby to supply fuel to the external unit, and a second pump unit, which is configured to suction fuel outside the subtank thereby to pump fuel into the subtank; and a filter member that is connected to a first suction port of the first pump unit for filtering the fuel supplied to the external unit and that is connected to a second suction port of the second pump unit for filtering the fuel pumped into the subtank, wherein the filter member includes: a case having therein a partition wall, which defines a first flow passage and a second flow passage, wherein the first flow passage directs the fuel in the subtank into the first suction port and the second flow passage directs the fuel outside the subtank into the second suction port through an opening formed on the subtank; a first filter element disposed in the first flow passage for filtering the fuel supplied to the external unit; and a second filter element disposed to cover the opening for filtering the fuel pumped into the subtank. 14. The fuel supply device according to claim 13, wherein the case is attached on a bottom surface of the subtank such that: a first inlet of the first flow passage opens into the subtank; and a second inlet of the second flow passage projects from the bottom surface of the subtank into an outside of the subtank, and opens toward a bottom surface of the fuel tank. 15. The fuel supply device according to claim 14, wherein: the opening of the subtank is formed on the bottom surface of the subtank; and the case of the filter member is inserted into the opening so as to be fixed to the subtank. 16. The fuel supply device according to claim 15, wherein: the case has a flanged portion on a sidewall thereof, and an outer diameter of the flanged portion is larger than an outer diameter of the opening of the subtank; and the flanged portion is formed between the first inlet and the second inlet in a thickness direction of the flanged portion, and is brought into contact with the bottom surface of the subtank when the case is inserted into the opening. 17. The fuel supply device according to claim 14, wherein the first filter element is disposed in the first inlet. 18. The fuel supply device according to claim 17, wherein the second inlet has a fuel passage on a sidewall thereof, and an outside and an inside of the sidewall of the second inlet communicate through the fuel passage. 19. The fuel supply device according to claim 13, wherein: the first suction port and the second suction port of the fuel pump are formed at one end portion of the fuel pump; a first outlet of the first flow passage that is connected to the first suction port and a second outlet of the second flow passage that is connected to the second suction port are formed at an end portion of the case; and the end portion of the case is opposed to the one end portion of the fuel pump. 20. The fuel supply device according to claim 13, further comprising a check valve disposed in the second flow passage, wherein the check valve allows only a flow of fuel from an outside into an inside of the subtank. 21. The fuel supply device according to claim 20, wherein the check valve is disposed on a downstream side of the second filter element in a flow direction of fuel. 22. The fuel supply device according to claim 13, wherein: the case includes an upper casing, which has an upper partition wall, and a lower casing, which has a lower partition wall and is attached to the upper casing; and the upper partition wall and the lower partition wall constitute the partition wall when the upper casing and the lower casing are attached to each other to form the case. 23. The fuel supply device according to claim 22, wherein the upper casing and the lower casing are attached to each other by press fitting to form the case. 24. The fuel supply device according to claim 13, wherein a filtration area of the second filter element is larger than a filtration area of the first filter element. 25. A fuel supply device configured to supply fuel in a fuel tank to an external unit, the device comprising: a subtank accommodated in the fuel tank, the subtank storing a part of the fuel in the fuel tank; a fuel pump accommodated in the subtank, the fuel pump having a first pump unit, which is configured to suction fuel in the subtank thereby to supply fuel to the external unit, and a second pump unit, which is configured to suction fuel outside the subtank thereby to pump fuel into the subtank; and a filter member that is connected to a first suction port of the first pump unit for filtering the fuel supplied to the external unit and that is connected to a second suction port of the second pump unit for filtering the fuel pumped into the subtank, wherein the filter member includes: a case having therein a partition wall, which defines a first flow passage and a second flow passage, wherein the first flow passage directs the fuel in the subtank into the first suction port and the second flow passage directs the fuel outside the subtank into the second suction port through an opening formed on the subtank; a first filter element configured to filter the fuel supplied to the external unit; and a second filter element disposed in the second flow passage for filtering the fuel pumped into the subtank, wherein the second filter element is disposed such that a surface of the second filter element is generally parallel to an inner surface of the subtank, on which the opening is formed. 26. The fuel supply device according to claim 25, wherein the first filter element is disposed in the first flow passage. 27. The fuel supply device according to claim 26, wherein a surface of the first filter element is arranged generally parallel to the surface of the second filter element. 28. The fuel supply device according to claim 27, wherein the first filter element and the second filter element have a plate-like shape. 29. The fuel supply device according to claim 26, wherein: the inner surface of the subtank is a bottom surface of the subtank; and the case is attached on the bottom surface of the subtank such that: a first inlet of the first flow passage opens into the subtank; and a second inlet of the second flow passage projects from the bottom surface of the subtank into an outside of the subtank, and opens toward a bottom surface of the fuel tank. 30. The fuel supply device according to claim 29, wherein the case is inserted into the opening of the subtank so as to be fixed to the subtank. 31. The fuel supply device according to claim 30, wherein: the case has a flanged portion on a sidewall thereof, and an outer diameter of the flanged portion is larger than an outer diameter of the opening of the subtank; and the flanged portion is formed between the first inlet and the second inlet in a thickness direction of the flanged portion, and is brought into contact with the bottom surface of the subtank when the case is inserted into the opening. 32. The fuel supply device according to any one of claims 29, wherein: the first filter element is disposed in the first inlet; and the second filter element is disposed in the second inlet. 33. The fuel supply device according to claim 32, wherein: the second inlet has a fuel passage on a sidewall thereof, and an outside and an inside of the sidewall of the second inlet communicate through the fuel passage; and the second filter element is disposed to cover the second inlet and the fuel passage. 34. The fuel supply device according to claim 25, wherein: the first suction port and the second suction port of the fuel pump are formed at one end portion of the fuel pump; a first outlet of the first flow passage that is connected to the first suction port and a second outlet of the second flow passage that is connected to the second suction port are formed at an end portion of the case; and the end portion of the case is opposed to the one end portion of the fuel pump. 35. The fuel supply device according to claim 25, further comprising a check valve disposed in the second flow passage, wherein the check valve allows only a flow of fuel from an outside into an inside of the subtank. 36. The fuel supply device according to claim 35, wherein the check valve is disposed on a downstream side of the second filter element in a flow direction of fuel. 37. The fuel supply device according to claim 25, wherein: the case includes an upper casing, which has an upper partition wall, and a lower casing, which has a lower partition wall and is attached to the upper casing; and the upper partition wall and the lower partition wall constitute the partition wall when the upper casing and the lower casing are attached to each other to form the case. 38. The fuel supply device according to claim 37, wherein the upper casing and the lower casing are attached to each other by press fitting to form the case. 39. The fuel supply device according to claim 25, wherein a filtration area of the second filter element is larger than a filtration area of the first filter element.
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이 특허에 인용된 특허 (13)
Gebert, Hans; Schneider, Horst; Siekmann, Jim; Waibel, Hans; Walter, Rudiger, Device for an arrangement inside a fuel tank for supplying and filtering fuel.
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