JP2009047156A - Fuel supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce manufacturing costs of a fuel supply device provided with a fuel pump having two pump units composed of a pump unit for supplying fuel in a sub tank to a fuel consumption device and a pump unit for pumping up fuel outside the sub tank into the sub tank. <P>SOLUTION: The fuel supply device 1 is provided with the fuel pump 6 which is accommodated in the sub tank 4 and includes the supply pump unit 65 for suctioning the fuel in the sub tank 4 and supplying the fuel to the fuel consumption device, and the pumping-up pump unit 66 for suctioning the fuel outside the sub tank 4 and pumping up the fuel into the sub tank 4. The fuel supply device 1 is also provided with a filter assembly 7 filtering the fuel suctioned by the both pump units 65, 66. The filter assembly 7 is provided with partition walls 82, 94 inside to form a supply fuel flow passage 71 and a pumping-up fuel flow passage 72. The supply fuel flow passage 71 is provided with a supply fuel filter 86 and the pumping-up fuel passage 72 is provided with a pumping-up fuel filter 99. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fuel supply apparatus.

  2. Description of the Related Art There is known a fuel supply device that stably supplies fuel even when the remaining amount of fuel in the fuel tank decreases (see, for example, Patent Document 1). The fuel supply device of Patent Document 1 is housed in a fuel tank. The fuel supply device includes a sub tank that stores a part of fuel in a fuel tank, a first pump unit that is accommodated in the sub tank and sucks fuel in the sub tank and supplies the fuel to the fuel consuming device, and sucks fuel outside the sub tank and sucks the sub tank. And a fuel pump having a second pump portion that pumps up inside. The suction ports of the first and second pump units are provided with filter members each having a bag-like filter medium that captures foreign matters in the fuel that is sucked.

From the suction port of the second pump section, a pumping pipe extends out of the subtank through an opening formed in the subtank, and a bag-like filter medium is fixed to the inlet of the pumping pipe. Therefore, the second pump unit sucks the fuel outside the sub tank from the bag-shaped filter medium, and sucks the fuel through the pumping pipe to the suction port of the second pump unit.
US Pat. No. 5,596,970

  However, the filter member of the fuel supply device includes two filter members, a filter member connected to the suction port of the first pump unit and a filter member connected to the suction port of the second pump unit. .

  In this configuration, two filter members must be prepared for manufacturing one fuel supply device, and the number of assembly steps of the fuel supply device increases because the two filter members are provided. The cost of the device increases.

  Furthermore, since these two filter members use two filter members each having a bag-like filter medium, the distance between the suction port of the second pump part and the inlet of the pumping pipe, that is, the second The length of the flow path for pumping from the pump section becomes longer. For this reason, the problem that high suction | attraction force is required for the 2nd pump part has arisen.

  The present invention has been made in view of such circumstances, and a first object of the present invention is to provide a first pump unit that supplies fuel in the subtank to the fuel consuming device and fuel outside the subtank in the subtank. An object of the present invention is to reduce the manufacturing cost of a fuel supply apparatus including a fuel pump having two pump parts of the second pump part to be pumped.

  The second object of the present invention is to provide a fuel pump having two pump parts, a first pump part for supplying fuel in the sub tank to the fuel consuming device and a second pump part for pumping fuel outside the sub tank into the sub tank. In the fuel supply device, the length of the flow path for pumping from the second pump unit is shortened.

According to the first aspect of the present invention, the first pump unit is accommodated in the subtank that is accommodated in the fuel tank and stores a part of the fuel, sucks the fuel in the subtank, and supplies the fuel to the fuel consuming device; A fuel supply device comprising a fuel pump having a second pump part for sucking and pumping fuel into a sub-tank, connected to a first suction port of a first pump part and a second suction port of a second pump part of the fuel pump And a filter member for filtering the supply fuel supplied to the fuel consuming device and the pumping fuel pumped up into the sub-tank,
Since the filter member is provided with a partition wall, the filter member has two flows, a first flow path for guiding the fuel in the sub tank to the first suction port and a second flow path for guiding the fuel outside the sub tank to the second suction port. A case in which a passage is formed, a first filter medium provided in the first flow path for filtering the fuel for supply, and a second filter medium provided in the second flow path for filtering the fuel for pumping. It is a feature.

  According to this configuration, by providing the partition wall inside one case, the first flow path for guiding the fuel in the sub tank to the first suction port and the second flow for guiding the fuel outside the sub tank to the second suction port. Two flow paths of the path are formed. Further, a first filter medium for filtering the supply fuel is provided in the first flow path, and a second filter medium for filtering the pumping fuel is provided in the second flow path. Thus, the fuel supply filter member and the pumping filter member can be made into one member, the structure of the fuel supply device is simplified, and an inexpensive fuel supply device can be provided.

  According to the invention described in claim 2, in the case of the filter member, the first inlet portion of the first flow path opens into the sub tank, and the second inlet portion of the second flow path projects outward from the bottom surface of the sub tank. And it is attached to the bottom face of a sub tank so that it may open toward the bottom face of a fuel tank. According to this structure, since the 1st inlet part is opened in the sub tank, the 1st flow path can guide the fuel in a sub tank to the 1st pump part. Further, since the second inlet projects outward from the bottom surface of the sub tank and opens toward the bottom surface of the fuel tank, the fuel in the fuel tank can be pumped up to the sub tank as much as possible.

  According to the third aspect of the present invention, an opening is formed in the bottom surface of the sub-tank, and the case of the filter member is inserted into the opening and fixed. By simply inserting from one direction, it is possible to attach the fuel tank with the filter member attached to the sub-tank, thereby reducing the number of assembling steps of the fuel supply device and providing an inexpensive fuel supply device.

  According to the fourth aspect of the present invention, the side wall of the case has an outer diameter larger than that of the opening, and when the case is inserted into the opening, the flange portion that contacts the bottom surface of the sub tank is formed. One inlet is formed on the sub tank side with respect to the flange, and the second inlet is formed on the outer side of the sub tank with respect to the flange. According to this configuration, the first and second inlet portions can be easily positioned by simply setting the fuel pump assembled with the filter member toward the bottom surface of the sub tank.

  According to the fifth aspect of the present invention, the first filter medium is provided at the first inlet portion, and the second filter medium is provided at the second inlet portion. According to this configuration, since both the first and second filter media are provided at the first and second inlet portions, the case is always filled with the fuel that has passed through the filtration, so that foreign matters are present in the case. Accumulation can be suppressed.

  According to the invention described in claim 6, the side wall of the second inlet portion is formed with a fuel passage that communicates the outside and the inside of the side wall, and the second filter medium covers the second inlet portion and the fuel passage. It is characterized by being provided in this way.

  Since the moisture contained in the fuel has a specific gravity greater than that of the fuel, the moisture tends to accumulate at the bottom of the fuel tank. If the second inlet portion is open toward the bottom surface of the fuel tank, there is a possibility that the fuel cannot be pumped up to the sub-tank when water accumulated at the bottom of the fuel tank freezes.

  According to this configuration, the fuel passage is formed in the side wall of the second inlet portion, and the second filter medium is provided so as to cover the second inlet portion and the fuel passage. Even if the fuel cannot be pumped from the inlet, the fuel can be pumped from the fuel passage provided in the side wall of the second inlet.

According to the seventh aspect of the present invention, the first pump unit is accommodated in the subtank that is accommodated in the fuel tank and accumulates a part of the fuel, and sucks the fuel in the subtank and supplies the fuel to the fuel consuming device. A fuel supply device comprising a fuel pump having a second pump portion that sucks fuel and pumps it into the sub-tank, and is provided at a first suction port of the first pump portion and a second suction port of the second pump portion of the fuel pump. A fuel supply device connected to the fuel consuming device, and a filter member for filtering the pumping fuel pumped into the sub-tank,
The filter member is provided with a partition wall inside, whereby the fuel outside the sub tank is guided to the second suction port through the first flow path for guiding the fuel in the sub tank to the first suction port and the opening formed in the sub tank. One case in which two flow paths of the second flow path are formed, a first filter medium provided in the first flow path for filtering the supply fuel, and a second filter medium for filtering the pumping fuel The second filter medium is provided so as to cover the opening.

  According to this configuration, the partition wall is provided inside one case, so that the fuel outside the sub tank can be passed through the first flow path that guides the fuel in the sub tank to the first suction port and the opening formed in the sub tank. Two channels of the second channel leading to the two suction ports are formed. Further, a first filter medium for filtering the supply fuel is provided in the first flow path, and a second filter medium for filtering the pumping fuel is provided so as to cover the opening.

  As a result, the filter member for supplying fuel and the second flow path of the filter member for pumping can be integrated into one case, and the second filter medium of the filter member for pumping can be integrated into the opening. With the simple configuration of being provided so as to cover, the pumping fuel can be filtered. For this reason, the structure of the fuel supply device is simplified, and an inexpensive fuel supply device can be provided.

  According to the invention described in claim 8, in the case of the filter member, the first inlet portion of the first flow path opens into the sub tank, and the second inlet portion of the second flow path projects outward from the bottom surface of the sub tank. And it is attached to the bottom face of a sub tank so that it may open toward the bottom face of a fuel tank. According to this structure, since the 1st inlet part is opened in the sub tank, the 1st flow path can guide the fuel in a sub tank to the 1st pump part. Further, since the second inlet projects outward from the bottom surface of the sub tank and opens toward the bottom surface of the fuel tank, the fuel in the fuel tank can be pumped up to the sub tank as much as possible.

  According to the invention described in claim 9, the opening is formed on the bottom surface of the sub tank, and the case of the filter member is inserted into the opening and fixed. By simply inserting from one direction, it is possible to attach the fuel tank with the filter member attached to the sub-tank, thereby reducing the number of assembling steps of the fuel supply device and providing an inexpensive fuel supply device.

  According to the tenth aspect of the present invention, the side wall of the case has a larger outer diameter than the opening, and when the case is inserted into the opening, the flange portion that contacts the bottom surface of the sub tank is formed. One inlet is formed on the sub tank side with respect to the flange, and the second inlet is formed on the outer side of the sub tank with respect to the flange. According to this configuration, the first and second inlet portions can be easily positioned by simply setting the fuel pump assembled with the filter member toward the bottom surface of the sub tank.

  According to the invention described in claim 11, the first filter medium is provided in the first inlet portion. According to this configuration, since the first filter medium is provided at the first inlet portion and the second filter medium is provided so as to cover the opening, the case is always filled with fuel that has passed through the filtration. , Accumulation of foreign matter in the case can be suppressed.

  According to a twelfth aspect of the present invention, the side wall of the second inlet portion is formed with a fuel passage that communicates the outside and the inside of the side wall.

  Since the moisture contained in the fuel has a specific gravity greater than that of the fuel, the moisture tends to accumulate at the bottom of the fuel tank. If the second inlet portion is open toward the bottom surface of the fuel tank, there is a possibility that the fuel cannot be pumped up to the sub-tank when water accumulated at the bottom of the fuel tank freezes.

  According to this configuration, the fuel passage is formed in the side wall of the second inlet portion, and the second filter medium is provided so as to cover the opening portion, so that moisture freezes and pumps up the fuel from the second inlet portion. Even if it is not possible, the fuel that has passed through the filtration can be pumped from the fuel passage provided in the side wall of the second inlet portion.

According to the thirteenth aspect of the present invention, the first pump unit that is accommodated in the fuel tank and accommodated in the sub tank that accumulates a part of the fuel, sucks the fuel in the sub tank and supplies the fuel to the fuel consuming device, A fuel supply device comprising a fuel pump having a second pump part for sucking and pumping fuel into a sub-tank, connected to a first suction port of a first pump part and a second suction port of a second pump part of the fuel pump And a filter member for filtering the supply fuel supplied to the fuel consuming device and the pumping fuel pumped up into the sub-tank,
The filter member is provided with a partition wall inside, whereby the fuel outside the sub tank is guided to the second suction port through the first flow path for guiding the fuel in the sub tank to the first suction port and the opening formed in the sub tank. One case in which two flow paths of the second flow path are formed, a first filter medium that filters the supply fuel, and a second filter medium that is provided in the second flow path and filters the pumping fuel The second filter medium is characterized in that it is arranged in parallel to the inner surface of the sub tank in which the opening is formed.

  According to this configuration, the partition wall is provided inside one case, so that the fuel outside the sub tank can be passed through the first flow path that guides the fuel in the sub tank to the first suction port and the opening formed in the sub tank. Two channels of the second channel leading to the two suction ports are formed. Further, the second flow path is provided with a second filter medium for filtering the pumping fuel. As a result, the first flow path of the filter member for fuel supply and the filter member for pumping can be integrated into one case, the structure of the fuel supply device is simplified, and the fuel supply device is inexpensive. Can be provided.

  Moreover, according to this structure, the 2nd filter medium is arrange | positioned in parallel with respect to the inner surface in which the opening part was formed in the subtank. For this reason, it becomes possible to suppress that the flow path length of a 2nd flow path becomes long by arrangement | positioning of a 2nd filter medium, and it becomes possible to shorten the flow path length of a 2nd flow path. That is, it is possible to shorten the flow path length for pumping from the second pump unit.

  According to the invention described in claim 14, the first filter medium is provided in the first flow path. For this reason, the filter member for fuel supply and the filter member for pumping can be made into one member, the structure of the fuel supply device is simplified, and an inexpensive fuel supply device can be provided.

  According to the invention described in claim 15, the first filter medium is arranged in parallel with the second filter medium. For this reason, it becomes possible to suppress that the length of a case becomes long by arrangement | positioning of a 1st filter medium in the flow path direction of a 2nd flow path, and it becomes possible to shorten the flow path length of a 2nd flow path. . That is, it is possible to shorten the flow path length for pumping from the second pump unit.

  According to the invention described in claim 16, the first filter medium and the second filter medium are plate-shaped filter media. For this reason, it becomes possible to make the flow path length of a 2nd flow path shorter, ie, it becomes possible to make the flow path length for pumping from a 2nd pump part shorter.

  According to the seventeenth aspect of the present invention, the inner surface is the bottom surface of the sub-tank, and the filter member case has a first inlet portion of the first channel opened into the sub-tank, and a second inlet of the second channel. The portion protrudes outward from the bottom surface and is attached to the bottom surface so as to open toward the bottom surface of the fuel tank. According to this structure, since the 1st inlet part is opened in the sub tank, the 1st flow path can guide the fuel in a sub tank to the 1st pump part. Further, since the second inlet projects outward from the bottom surface of the sub tank and opens toward the bottom surface of the fuel tank, the fuel in the fuel tank can be pumped up to the sub tank as much as possible.

  According to the invention described in claim 18, the case of the filter member is inserted into the opening and fixed. By simply inserting from one direction, it is possible to attach the fuel tank with the filter member attached to the sub-tank, thereby reducing the number of assembling steps of the fuel supply device and providing an inexpensive fuel supply device.

  According to the nineteenth aspect of the invention, the side wall of the case has a larger outer diameter than the opening, and when the case is inserted into the opening, the flange portion that contacts the bottom surface of the sub tank is formed. One inlet is formed on the sub tank side with respect to the flange, and the second inlet is formed on the outer side of the sub tank with respect to the flange. According to this configuration, the first and second inlet portions can be easily positioned by simply setting the fuel pump assembled with the filter member toward the bottom surface of the sub tank.

  According to the twentieth aspect of the invention, the first filter medium is provided at the first inlet portion, and the second filter medium is provided at the second inlet portion. According to this configuration, since both the first and second filter media are provided at the first and second inlet portions, the case is always filled with the fuel that has passed through the filtration, so that foreign matters are present in the case. Accumulation can be suppressed.

  According to the invention of claim 21, the side wall of the second inlet portion is formed with a fuel passage that communicates the outside and the inside of the side wall, and the second filter medium covers the second inlet portion and the fuel passage. It is characterized by being provided in this way.

  Since the moisture contained in the fuel has a specific gravity greater than that of the fuel, the moisture tends to accumulate at the bottom of the fuel tank. If the second inlet portion is open toward the bottom surface of the fuel tank, there is a possibility that the fuel cannot be pumped up to the sub-tank when water accumulated at the bottom of the fuel tank freezes.

  According to this configuration, the fuel passage is formed in the side wall of the second inlet portion, and the second filter medium is provided so as to cover the second inlet portion and the fuel passage. Even if the fuel cannot be pumped from the inlet, the fuel can be pumped from the fuel passage provided in the side wall of the second inlet.

  According to the invention described in claim 22, the first suction port and the second suction port of the fuel pump are formed at one end of the fuel pump, and the first flow path of the first flow path connected to the first suction port is formed. The second outlet portion of the second flow path connected to the one outlet portion and the second suction port is formed at an end portion facing the one end portion of the fuel pump.

  According to this configuration, the end portions where the first and second outlet portions are formed are easily moved toward each other end portion where the first and second outlet portions of the fuel pump are formed. Can be connected to.

  According to a twenty-third aspect of the present invention, the second flow path is provided with a check valve that allows only fuel to flow from the outside of the sub tank to the inside of the sub tank. According to this configuration, the fuel pumped into the sub tank can be prevented from flowing out of the sub tank again through the second flow path.

  According to the invention of claim 24, the check valve is provided on the downstream side of the second filter medium. According to this configuration, it is possible to suppress the deterioration of the function of the check valve due to foreign matter contained in the fuel entering between the valve body and the valve seat of the check valve.

  According to the invention of claim 25, the case includes an upper case having an upper partition wall, and a lower case having a lower partition wall and assembled with the upper case to form a case, and the upper partition wall. The lower partition wall is characterized by forming the partition wall by assembling the upper case and the lower case together to form the case.

  According to this configuration, the upper partition wall and the lower partition are formed by providing the upper partition wall in the upper case, providing the lower partition wall in the lower case, and assembling the upper case and the lower case together. The wall forms a partition wall. By comprising in this way, it becomes possible to make one case where a 1st flow path and a 2nd flow path are formed by providing a partition wall inside a simple structure. Therefore, the structure of the fuel supply device is simplified, and an inexpensive fuel supply device can be provided.

  According to a twenty-sixth aspect of the present invention, the upper case and the lower case are assembled together by press-fitting to form a case. According to this configuration, since the upper case and the lower case are assembled together by press-fitting, one case in which the first flow path and the second flow path are formed can be configured more easily. Therefore, the structure of the fuel supply device is simplified, and an inexpensive fuel supply device can be provided.

  According to invention of Claim 27, compared with the filtration area of the 1st filter medium, the filtration area of the 2nd filter medium is set large, It is characterized by the above-mentioned.

  Since the fuel is filtered through the first filter medium after being filtered through the second filter medium, the filtrate is more likely to accumulate in the second filter medium as compared with the first filter medium. There is a possibility that it may decrease quickly compared to the filtration capacity of the first filter medium.

  According to this configuration, since the filtration area of the second filter medium is set larger than the filtration area of the first filter medium, the filtration capacity of the second filter medium is faster than that of the first filter medium. It can suppress that it falls.

  Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings. In the following embodiments, the same or equivalent parts are denoted by the same reference numerals in the drawings.

(First embodiment)
FIG. 1 is a cross-sectional view showing a state in which the fuel supply device 1 is installed in the fuel tank 2. A vertical direction indicated by an arrow in FIG. 1 indicates a direction of gravity of the fuel tank 2 mounted on the vehicle. The fuel supply device 1 is a device that supplies the fuel in the fuel tank 2 to a fuel consuming device (for example, an internal combustion engine). As shown in FIG. 1, the fuel supply device 1 is disposed by being inserted into the fuel tank 2 from the opening 21 of the fuel tank 2, and is installed on the bottom surface 22 of the fuel tank 2. The flange 3 is attached to the opening 21 and the opening 21 is closed.

  The fuel supply device 1 is configured by assembling a pump unit 5 and the like to a sub tank 4 accommodated in a fuel tank 2. The sub tank 4 is connected to the flange 3 by a shaft 34.

  The flange 3 is made of resin and has a substantially disk shape. In the flange 3, the fuel discharge pipe 31 and the electrical connector 32 are integrally molded with resin. The fuel discharge pipe 31 is connected to the pump unit 5 housed in the sub tank 4 via a hose 33 and supplies the fuel discharged from the pump unit 5 to the internal combustion engine outside the fuel tank 2.

  The electrical connector 32 is electrically connected to an electrical connector 32 (not shown) provided in the pump unit 5 by a lead wire and a power supply connector (not shown), and supplies power to the pump unit 5.

  The sub-tank 4 is made of resin, and includes a substantially disc-shaped bottom surface 41 and a side wall 42 extending upward from the outer peripheral edge of the bottom surface 41, and accumulates a part of the fuel in the fuel tank 2. The inner wall surface of the side wall 42 is formed with an insertion portion (not shown) for inserting the shaft 34 fixed to the end portion of the flange 3 on the sub tank 4 side by press fitting or the like. The shaft 34 is inserted in the insertion portion so as to be movable in the axial direction.

  A coil spring 35 is provided between the flange 3 and the sub tank 4 to urge the sub tank 4 downward and press the sub tank 4 against the bottom surface 22 of the fuel tank 2. One end of the spring 35 is supported by the flange 3, and the other end is supported by the insertion portion of the sub tank 4.

  Accordingly, even if the distance between the opening 21 and the bottom surface 22 of the fuel tank 2 fluctuates because the resin fuel tank 2 expands or contracts due to a change in internal pressure or a change in fuel amount due to a temperature change, the sub tank 4 can follow the position variation of the bottom surface 22.

  An opening 43 is formed in the bottom surface 41 of the sub tank 4. A leg 44 extending toward the bottom surface 22 of the fuel tank 2 is formed around the opening 43. A filter assembly 7 as a filter member is inserted into the opening 43.

  The pump unit 5 is supported on the side wall 42 of the sub tank 4 by a support mechanism (not shown). The pump unit 5 includes a fuel pump 6, a fuel filter 52, a pressure regulator 67, and a filter assembly 7. The fuel pump 6 is a supply pump unit 65 as a first pump unit that sucks the fuel in the sub tank 4 and supplies it to the internal combustion engine, and a pump for pumping up as a second pump unit that pumps the fuel outside the sub tank 4 into the sub tank 4. And an electric motor unit 63 that drives both pump units 65 and 66.

  A flow path is formed in each of the supply and pumping pump parts 65 and 66. Each flow path contains one blade portion. The blade portion is formed on one disk-like impeller 64, and the impeller 64 is rotationally driven by the electric motor portion 63. When the impeller 64 is driven to rotate, the pressure of the fuel sucked into the flow path is increased.

  A supply pump suction port 651 as a first suction port that communicates with the flow path of the supply pump unit 65 is formed at the lower end of the fuel pump 6, and a second that communicates with the flow path of the pumping pump unit 66. A pumping pump suction port 661 as a suction port is formed side by side. In addition to the two suction ports 651 and 661, a pumping pump discharge port 662 for discharging the fuel pumped up by the pumping pump unit 66 into the sub tank 4 is formed at the lower end of the fuel pump 6. . A supply pump discharge port 652 for discharging the fuel pumped up by the supply pump unit 65 is formed at the upper end of the fuel pump 6.

  A filter assembly 7 that filters fuel sucked from the supply pump suction port 651 and the pumping pump suction port 661 is attached to the lower end of the fuel pump 6. By operating the electric motor unit 63 to rotationally drive the impeller 64, suction force is generated in the supply pump unit 65 and the pumping pump unit 66. Then, the fuel in the sub tank 4 is sucked into the supply pump suction port 651 through the filter assembly 7, and the fuel outside the sub tank 4 is sucked into the pumping pump suction port 661 through the filter assembly 7.

  The fuel sucked from the supply pump suction port 651 is discharged from the supply pump discharge port 652 and supplied to the fuel filter 52. The fuel sucked from the pumping pump suction port 661 is discharged from the pumping pump discharge port 662 and supplied into the sub tank 4.

  The filter case 51 accommodates therein a fuel filter 52 that filters the fuel discharged from the supply pump discharge port 652. The filter case 51 is made of resin and has a substantially annular space for accommodating the fuel filter 52. The filter case 51 is configured such that the fuel pump 6 is accommodated in a space on the inner peripheral side of the substantially annular space. The upper end portion of the filter case 51 has a connection portion that connects the supply pump discharge port 652. The connection portion and the substantially annular space communicate with each other through a fuel passage, and the fuel discharged from the supply pump discharge port 652 is supplied to the fuel filter 52.

  A pressure regulator 67 is provided at the lower end of the filter case 51, specifically at the lower end of the substantially annular space. The pressure regulator 67 adjusts the pressure of the fuel that has passed through the fuel filter 52. The fuel whose pressure is adjusted by the pressure regulator 67 is discharged from a discharge port 68 formed in the filter case 51. The fuel discharged from the discharge port 68 is supplied to the internal combustion engine outside the fuel tank 2 through the hose 33 and the fuel discharge pipe 31. When the pressure of the fuel discharged from the fuel pump 6 exceeds a predetermined value, the excess pressure fuel flows out from a drain port (not shown) of the pressure regulator 67 and returns into the sub tank 4.

  Next, the filter assembly 7 will be described in detail with reference to FIGS. 2 is a cross-sectional view of the filter assembly 7, FIG. 3 is a cross-sectional view in the direction of III in FIG. 2, and FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG.

  The filter assembly 7 is connected to the fuel pump 6 and filters the fuel sucked by the supply pump unit 65 of the fuel pump 6 and the fuel sucked by the pumping pump unit 66 with one component.

  The filter assembly 7 is made of resin, and has an upper case 8 and a lower case 9 as shown in FIG. The lower case 9 is composed of a cylindrical portion 91 having an open end in the vertical direction. A first partition wall 93 that divides the cylindrical portion 91 in the vertical direction is formed in the vicinity of the approximate center of the cylindrical portion 91. Yes. A flange portion 96 extending toward the outer peripheral side is formed on the outer wall surface near the substantially central portion of the cylindrical portion 91.

  The cylindrical portion 91 below the flange portion 96 can be inserted into the opening 43 formed in the bottom surface 41 of the sub tank 4. A groove portion 97 is formed on the outer wall surface of the cylindrical portion 91 that comes into contact with the opening portion 43. An O-ring 98 that secures the sealing performance between the cylindrical portion 91 and the opening 43 is attached to the groove portion 97.

  The lower opening 92 on the lower side of the cylindrical portion 91 projects outward from the bottom surface 41 and faces the bottom surface 22 of the fuel tank 2 when the lower case 9 is inserted into the opening 43 of the sub tank 4. It is open. The opening 43 is provided with a pumping fuel filter 99 as a second filter medium. The pumping fuel filter 99 is a plate-like, for example, substantially disk-shaped nonwoven fabric, and is joined to the outer peripheral edge of the lower opening 92 by welding or the like. The pumped fuel filter 99 is disposed substantially parallel to the bottom surface 41 in which the opening 43 is formed in the sub tank 4.

  The pumping fuel filter 99 is made of, for example, a fiber made of a resin such as polyester, nylon, polypropylene, or polyacetylene. Since these materials have a relatively high durability against the fuel, the life of the filter assembly 7 can be extended by using it as the pumping fuel filter 99.

  As shown in FIGS. 2 and 4, the upper surface of the first partition wall 93 is formed with a protruding portion 94 that divides the surface into a left surface and a right surface. 2 and 4, a plurality of through holes 95 penetrating the first partition wall 93 are formed side by side on the circumference on the right side of the protrusion 94. Further, a check valve 100 that permits only the flow of fuel from the lower side to the upper side of the cylindrical portion 91 is provided on the surface.

  As shown in FIG. 2, the check valve 100 is formed in an umbrella shape, where a portion that hits the handle portion of the umbrella is inserted into the hole of the first partition wall 93, and a portion that hits the outer peripheral portion of the umbrella is the first partition. It is comprised so that it may contact | abut on the upper surface of the wall 93. FIG. Thereby, the through hole 95 is closed.

  When the fuel pressure below the through hole 95 becomes higher than the upper pressure, the check valve 100 moves away from the upper surface, and the fuel below the first partition wall 93 passes through the through hole 95 to the upper side. Circulate in

  The upper case 8 is formed so as to close the upper opening of the cylindrical portion 91 of the lower case 9. A second partition wall 82 that protrudes toward the protrusion 94 of the first partition wall 93 is formed on the surface of the upper case 81 that faces the first partition wall 93 of the upper end portion 81 (broken line in FIG. 3). See section). By assembling the upper case 8 to the lower case 9, two spaces formed by the upper end portion of the upper case 8 and the first partition wall 93 of the lower case 9 are formed as shown in FIG. 2. The second partition wall 82 corresponds to the upper partition wall described in the claims, the protrusion 94 corresponds to the lower partition wall described in the claims, and the second partition wall 82 and the protrusion 94 correspond to the claims. This corresponds to the partition wall described in.

  An upper opening 83 communicating with the left space in FIG. 2 is formed at the upper end 81. The opening 83 is provided with a supply fuel filter 86 as a first filter medium. The supply fuel filter 86 is also formed in a plate shape, like the pumping fuel filter 99, and the supply fuel filter 86 is disposed substantially parallel to the pumping fuel filter 99. The filtration area of the pumped fuel filter 99 is set larger than the filtration area of the supply fuel filter 86. That is, as shown in FIGS. 2 and 3, the pumped fuel filter 99 is larger than the supply fuel filter 86.

  The supply fuel filter 86 is a non-woven fabric formed of the same material as that of the pumped fuel filter 99. The supply fuel filter 86 is joined to the upper opening 83 by welding or insert molding, for example.

  A first connection portion 84 that communicates with the space on the left side in FIG. 2 is formed at the upper end portion 81. The first connection portion 84 is connected to the supply pump suction port 651 of the fuel pump 6. Further, the upper end portion 81 is formed with a second connection portion 85 that communicates with the space on the right side in FIG. The second connection portion 85 is connected to the pumping suction port 661 of the fuel pump 6.

  By assembling the upper case 8 and the lower case 9 configured as described above, the filter assembly 7 has the upper opening 83 as the first inlet and the first connection 84 as the first outlet. 2 of the pumped fuel flow path 72 as the second flow path as the first flow path and the lower opening 92 as the second flow path and the second connection section 85 as the second flow path. Two flow paths are formed.

  Next, the flow of fuel in the filter assembly 7 when the fuel pump 6 is operated will be described.

  When the fuel pump 6 is operated, a suction force is generated in the supply pump unit 65 and the pumping pump unit 66. Then, the fuel in the sub tank 4 flows into the supply fuel flow path 71 from the upper opening through the supply fuel filter 86. The fuel that has flowed into the supply fuel channel 71 is sucked into the supply pump suction port 651 of the fuel pump 6 through the first connection portion 84.

  The fuel outside the sub tank 4 flows into the pumped fuel flow path 72 from the lower opening 92 through the pumped fuel filter 99 through the opening 43 formed in the sub tank 4. The fuel that has flowed into the pumped fuel flow path 72 passes through the through hole 95 and is sucked into the pumping pump suction port 661 of the fuel pump 6 through the second connection portion 85. That is, the pumping fuel flow path 72 can be said to be a flow path for pumping fuel outside the sub tank 4 (in the fuel tank 2) to the pump suction port 661 through the opening 43 formed in the sub tank 4.

  In this embodiment, unlike the prior art, the first and second partition walls 93 and 82 and the protrusion 94 are provided in one case (in a state where the upper case 8 and the lower case 9 are assembled). By providing the filter assembly 7, two flow paths (a supply fuel flow path 71 and a pumping fuel flow path 72) are formed, and a supply fuel filter 86 and a pumping fuel filter 99 are provided in the respective flow paths 71 and 72. Is connected to the fuel pump 6.

  As a result, the number of parts can be reduced and the structure of the fuel supply device 1 can be simplified as compared with the conventional structure in which a filter member is provided for each suction port formed in the fuel pump. it can. As a result, an inexpensive fuel supply device 1 can be provided.

  In the present embodiment, the second partition wall 82 is provided in the upper case 8, the protrusion 94 is provided in the lower case 9, and the upper case 8 and the lower case 9 are assembled together to form one case. The second partition wall 82 and the protrusion 94 form a partition wall. With this configuration, it is possible to make a simple structure in one case where the supply fuel flow path 71 and the pumping fuel flow path 72 are formed by providing a partition wall inside. Therefore, the structure of the fuel supply device 1 is simplified, and an inexpensive fuel supply device 1 can be provided.

  In the present embodiment, the first and second connection portions 84 and 85 are formed side by side at the upper end portion 81 of the filter assembly 7, so that the supply pump suction port 651 and the pumping pump suction are formed at one end portion of the fuel pump 6. When the ports 661 are formed side by side, the connection portions 84 and 85 and the suction ports 651 and 661 can be easily connected simply by moving the filter assembly 7 toward the suction ports 651 and 661. can do.

  Further, since the filter assembly 7 is fixed by being inserted into the opening 43 formed in the sub tank 4, the pump unit 5 with the filter assembly 7 attached to the end of the fuel pump 6 is connected to the opening of the sub tank 4. The pump unit 5 can be easily assembled to the sub tank 4 simply by inserting from the side.

  The filter assembly 7 has a flange portion 96, an upper opening 83 into which fuel in the sub tank 4 flows is formed above the flange portion 96, and fuel outside the sub tank 4 is located below the flange portion 96. A lower opening 92 into which the water flows is formed. For this reason, when the filter assembly 7 is assembled to the opening 43 of the sub tank 4, both the openings 83 and 92 can be arranged at appropriate positions simply by inserting the filter assembly 7 until the flange 96 abuts against the bottom surface of the sub tank 4. .

  A check valve 100 that allows only the flow of fuel from the lower opening 92 to the second connection portion 85 is provided in the middle of the pumped fuel flow path 72, so that the fuel pumped into the sub tank 4 flows backward. Outflow to the outside of the sub tank 4 can be suppressed.

  Further, since the check valve 100 is provided on the downstream side of the pumped fuel filter 99, the check valve 100 is formed by foreign matter in the fuel being sandwiched between the check valve 100 and the first partition wall 93. The occurrence of functional degradation can be suppressed.

  In this embodiment, since the supply fuel filter 86 is provided in the upper opening 83 and the pumping fuel filter 99 is provided in the lower opening 92, both filters 86 and 99 are always provided in the filter assembly 7. It is filled with the fuel that has passed through, so that accumulation of foreign matters in the fuel in the filter assembly 7 can be suppressed.

  Further, since the lower opening 92 projects outward from the bottom surface 41 of the sub tank 4 and opens toward the bottom surface 22 of the fuel tank 2, the fuel in the fuel tank 2 is pumped up to the sub tank 4 as much as possible. be able to.

  The second partition wall 82 and the protrusion 94 may be joined with an adhesive or the like, but the pressure loss when the fuel passes through the gap between the second partition wall 82 and the protrusion 94 is non-returnable. If the pressure loss is greater than the pressure loss when the fuel passes through the gap between the valve 100 and the first partition wall 93, the fuel in the supply fuel flow path 71 can be prevented from being pumped through the gap and flowing out to the fuel flow path 72. The partition wall 82 and the protrusion 94 may be in contact with each other without being bonded with an adhesive or the like.

  In FIG. 2, if the pumped fuel filter 99 is disposed so as to be inclined with respect to the bottom surface 41, the flow path length of the fuel flow path 72 becomes longer. Therefore, a high suction force is required for the pumping pump section 66. Problem arises. On the other hand, in the present embodiment, the pumped fuel filter 99 is disposed substantially parallel to the bottom surface 41 in which the opening 43 is formed in the sub-tank 4. It becomes possible to suppress that the flow path length of 72 becomes long. That is, the length of the pumped fuel flow path 72 can be shortened. That is, since the pumping path length from the pumping pump section 66 can be shortened, the problem that a high suction force is required for the pumping pump section 66 can be suppressed.

  In FIG. 2, when the supply fuel filter 86 is disposed so as to be inclined with respect to the pumped fuel filter 99 disposed substantially parallel to the bottom surface 41, the flow direction of the pumped fuel channel 72 (FIG. 2). In the vertical direction), the length of the case composed of the upper case 8 and the lower case 9 becomes longer. On the other hand, in this embodiment, the supply fuel filter 86 is arranged substantially parallel to the pumped fuel filter 99 arranged substantially parallel to the bottom surface 41. For this reason, the arrangement of the supply fuel filter 86 can suppress an increase in the length of the case including the upper case 8 and the lower case 9 in the flow direction of the pumped fuel flow path 72. Accordingly, the length of the pumping fuel channel 72 can be shortened, that is, the length of the pumping channel from the pumping pump unit 66 can be shortened. For this reason, the problem that high suction | attraction force is required for the pump part 66 for pumping can be suppressed.

  In addition, since the supply fuel filter 86 and the pumped fuel filter 99 are plate-shaped filters rather than bag-shaped filters, the length of the pumped fuel channel 72 can be further shortened. That is, the length of the flow path for pumping from the pumping pump unit 66 can be further shortened, so that the problem that a high suction force is required for the pumping pump unit 66 can be further suppressed.

  Since the fuel is filtered by the pumped fuel filter 99 and then filtered by the supply fuel filter 86, the filtrate is more likely to accumulate in the pumped fuel filter 99 compared to the supply fuel filter 86. The filtering capacity of the filter 99 may decrease faster than the filtering capacity of the supply fuel filter 86.

  On the other hand, in this embodiment, since the filtration area of the pumped fuel filter 99 is set larger than the filtration area of the supply fuel filter 86, the pumped fuel is compared with the filtration capacity of the supply fuel filter 86. It can suppress that the filtration capability of the filter 99 falls quickly.

(Second Embodiment)
A second embodiment of the present invention will be described with reference to FIGS. FIG. 5 is a sectional view of a filter assembly according to the second embodiment, and FIG. 6 is a plan view of a pumping fuel filter provided in the filter assembly.

  As shown in FIGS. 5 and 6, the pumped fuel filter 99a has a structure in which a filter body 992 made of a nonwoven fabric similar to that of the first embodiment is provided on a substantially annular ring member 991. The pumping fuel filter 99a of the present embodiment is fixed by press-fitting the ring member 991 into the inner wall of the cylindrical portion 91 of the lower case 9. As a result, the fuel filter 99a drawn up to the filter assembly 7 can be easily attached.

(Third embodiment)
A third embodiment of the present invention will be described with reference to FIGS. FIG. 7 is a sectional view of a filter assembly according to the third embodiment, and FIG. 8 is a plan view of a pumping fuel filter provided in the filter assembly.

  As shown in FIG. 7 and FIG. 8, the pumped fuel filter 99 b connects the substantially annular ring member 993, the disk member 994 disposed substantially at the center of the ring member 993, and the ring member 993 and the disk member 994. A filter body 996 made of a nonwoven fabric similar to that of the first embodiment is provided in a space between the ring member 993 and the disk member 994. The pumping fuel filter 99b of the present embodiment is fixed by press-fitting the ring member 993 into the inner wall of the cylindrical portion 91 of the lower case 9. Thereby, the fuel filter 99b drawn up to the filter assembly 7 can be easily attached.

  In addition, the pumped fuel filter 99b of the present embodiment has a structure in which the filter main body 996 is supported by the disk member 994 and the hub member 995 provided in the substantially central portion, so that the strength of the filter 99b is improved.

(Fourth embodiment)
A fourth embodiment of the present invention will be described with reference to FIGS. 9 and 10. FIG. 9 is a cross-sectional view of the filter assembly according to the fourth embodiment, and FIG. 8 is a side view of the main part of the filter assembly.

  As shown in FIG. 9, a substantially annular protruding portion 91 a is formed on the flange portion 96 of the lower case 9 on the outer peripheral side of the cylindrical portion 91. The protrusion 91 a is supported by the opening 43 of the sub tank 4.

  As shown in FIG. 10, a plurality of groove portions 91 b are formed on the side wall near the lower opening 92 of the cylindrical portion 91 so as to communicate the outer wall and the inner wall of the cylindrical portion 91. The groove portion 91b becomes a fuel passage described in the claims.

  The pumping fuel filter 99c provided in the lower opening 92 is provided so as to cover the groove 91b as shown in FIG. The pumped fuel filter 99c has an end of the filter 99c fixed by a resin ring 997.

  Since the moisture contained in the fuel has a specific gravity greater than that of the fuel, the moisture tends to accumulate on the bottom surface 22 of the fuel tank 2. If the lower opening 92 opens toward the bottom surface 22 of the fuel tank 2 as in the first to third embodiments, when the water accumulated near the bottom surface 22 freezes, the lower opening 92 starts from the lower opening 92. There is a risk that the fuel cannot be inhaled.

  In the filter assembly 7 of the present embodiment, since the groove portion 91b is formed on the side wall of the cylindrical portion 91, the fuel can be sucked from the groove portion 91b even if the fuel cannot be sucked from the lower opening 92. .

  Further, as shown in FIG. 11, a through-hole 91 c is formed in the side wall of the cylindrical portion 91 instead of the groove portion 91 b as shown in FIG. 10, and the pumping fuel filter provided in the lower opening 92 in the through-hole 91 c. A filter 998 different from 99 may be provided.

(Fifth embodiment)
A fifth embodiment of the present invention will be described with reference to FIGS.

  In the present embodiment, an arm portion 60 with a locked hole 601 is formed on the lower end side of the fuel pump 6, and a locking claw 701P locked with the locked hole 601 is formed on the filter assembly 7P. To do. By locking the locking claw 701P in the locked hole 601, the connection between the connecting portions 84P and 85P (FIG. 14) of the filter assembly 7P and the suction ports 651 and 661 of the fuel pump 6 can be strengthened. The locking claw 701P is formed in the lower case 9P as shown in FIGS.

  As shown in FIG. 14, the filter assembly 7P includes a case 70P, a supply fuel filter 86P, a pumping fuel filter 99P, and a check valve 100. The filter assembly 7P is fixed to the sub tank 4 by press-fitting the cylindrical portion 91P into the opening 43 of the sub tank 4. The groove portion 97 and the O-ring 98 are eliminated, and the sealing performance between the cylindrical portion 91P and the opening 43 is ensured by press-fitting.

  The case 70P is formed by press-fitting the upper case 8P into the lower case 9P. By press-fitting, the sealing property between the upper case 8P and the lower case 9P is secured. Unlike the cases 8 and 9 of the above-described embodiment, in this embodiment, the locking claw 701P is formed in the lower case 9P, and therefore the upper case 8P is assembled in the lower case 9P. It is said. A flange 96P is formed on the lower case 9P.

  Also in the present embodiment, the second partition wall 82P is provided in the upper case 8P, the protrusion 94P is provided in the lower case 9P, and the upper case 8P and the lower case 9P are assembled together to form the case 70P. The partition wall 82P and the protrusion 94P form a partition wall 702P. The second partition wall 82P is fitted to the protrusion 94P, thereby forming the partition wall 702P.

  The protrusion 94P is formed in the shape shown in FIG. 16, and although not shown, the second partition wall 82P is also formed in the same shape as the protrusion 94P. As shown in FIG. 16, in the lower case 9P, a supply fuel flow path 71P and a pumping fuel flow path 72P are formed by being separated by a protrusion 94P. Although not shown, the upper case 8P is also divided by a second partition wall 82P formed in the same shape as the protrusion 94P, and a supply fuel passage 71P and a pumping fuel passage 72P are formed.

  With this configuration, it is possible to provide a simple structure for one case 70P in which the supply fuel flow path 71P and the pumping fuel flow path 72P are formed by providing the partition wall 702P inside. Therefore, the structure of the fuel supply device 1 is simplified, and an inexpensive fuel supply device 1 can be provided.

  The pumping fuel filter 99P has a structure in which a filter main body 992P composed of a nonwoven fabric similar to that of the first embodiment is provided on a substantially annular ring member 991P in the same manner as the pumping fuel filter 99a of the second embodiment. It has become. The pumping fuel filter 99P of the present embodiment is fixed by press-fitting the ring member 991P into the inner wall (lower opening 92P) of the cylindrical portion 91P of the lower case 9P. As a result, the fuel filter 99P can be easily pumped to the case 70P.

  The supply fuel filter 86P is also a non-woven fabric formed of the same material as the pumped fuel filter 99P, and is joined to the upper opening 83P by welding, for example. In addition, compared with the upper side opening part 83 shown in FIG. 3, the upper side opening part 83P shown in FIG. 13 is enlarged. In the supply fuel flow path 71P, the upper opening 83P is maximized, thereby increasing the filtration area of the supply fuel filter 86P. By increasing the filtration area of the supply fuel filter 86P, the filter life of the supply fuel filter 86P can be extended.

(Sixth embodiment)
A sixth embodiment of the present invention will be described with reference to FIGS.

  Also in the filter assembly 7Q of this embodiment, the supply fuel filter 86Q is a non-woven fabric formed of the same material as the filters 86, 99, 86P, 99P, and is joined to the upper case 8Q at the upper opening 83Q by insert molding. . In case 70Q, three notches 831Q are provided in upper opening 83Q of upper case 8Q, and three notches 97Q are provided in the side wall of lower case 9Q. Thereby, the supply fuel filter 86Q is exposed from the case 70Q through the notches 831Q and 97Q.

  Even when the level of the fuel is lowered to a level FL as shown in FIG. 18, the portion of the supply fuel filter 86Q exposed through the notches 831Q and 97Q filters the fuel of the level FL to Can be supplied to the fuel consuming device. As shown in FIG. 19, the portion of the supply fuel filter 86Q that is not exposed through the notches 831Q and 97Q cannot filter the level FL fuel and supply the fuel to the fuel consuming device. However, since the portion of the supply fuel filter 86Q that is not exposed through the notches 831Q and 97Q is surrounded by the upper case 8Q, the supply fuel filter 86Q is firmly joined to the upper case 8Q.

(Seventh embodiment)
A seventh embodiment of the present invention will be described with reference to FIG.

  In the filter assembly 7R of the present embodiment, the pumped fuel filter 99R is provided so as to cover the opening 43 of the sub tank 4R without being integrated with the case 70R.

  As shown in FIG. 20, the filter assembly 7 </ b> R includes a case 70 </ b> R, a supply fuel filter 86 </ b> P, and a check valve 100. The filter assembly 7R is fixed to the sub tank 4R by press-fitting the cylindrical portion 91R into the opening 43 of the sub tank 4R. The groove portion 97 and the O-ring 98 are eliminated, and the sealing performance between the cylindrical portion 91R and the opening 43 is ensured by press-fitting. In the present embodiment, a filter member is constituted by the filter assembly 7R and the pumped fuel filter 99R.

  The case 70R is formed by press-fitting the upper case 8P into the lower case 9R. By press-fitting, the sealing property between the upper case 8P and the lower case 9R is secured. Also in the present embodiment, the second partition wall 82P is provided in the upper case 8P, the protrusion 94P is provided in the lower case 9R, and the upper case 8P and the lower case 9R are assembled together to form the case 70R. The partition wall 82P and the protrusion 94P form a partition wall 702P.

  Channels 71P and 72R are formed by the partition wall 702P. The pumping fuel flow path 72R is formed from the lower opening 92R to the second connection part 85P via the through hole 95 and the check valve 100, and through the opening 43 formed in the sub tank 4R. The fuel in the fuel tank 2 is pumped up and guided to the pump suction port 661.

  The pumped fuel filter 99R is a fuel filter having a larger diameter than the pumped fuel filters 99a and 99P, and a filter main body 992R composed of a nonwoven fabric similar to the filter main bodies 992 and 992P is provided on a substantially annular ring member 991R. It has a structure. The pumped fuel filter 99R is not integrated with the case 70R, and is provided so as to cover the opening 43 of the sub tank 4R. Specifically, the pumping fuel filter 99R is fixed by press-fitting the ring member 991R into the inner wall of the cylindrical portion 44R of the sub tank 4R, and is attached to the sub tank 4R so as to cover the opening 43.

  The supply fuel filter 86P is also a non-woven fabric formed of the same material as the fuel filters 86, 99, 99P, 99R, and is joined to the upper opening 83P by welding, for example.

  In the present embodiment, a partition wall 702P is provided inside one case 70R, so that the fuel in the sub tank 4R is guided to the supply pump suction port 651 and the opening 43 formed in the sub tank 4R. Two flow paths, a pumping fuel flow path 72R, for leading the fuel outside the sub tank 4R to the pumping pump suction port 661 are formed. Further, a supply fuel filter 86P for filtering the supply fuel is provided in the supply fuel flow path 71P, and a pumping fuel filter 99R for filtering the pumping fuel is provided so as to cover the opening 43.

  This makes it possible to integrate the fuel supply filter member (the supply fuel passage 71P and the supply fuel filter 86P) and the pumping fuel passage 72R of the pumping filter member into one case 70R. The pumping fuel can be filtered by a simple configuration in which the pumping fuel filter 99R in the pumping filter member is provided so as to cover the opening 43. For this reason, the structure of the fuel supply device 1 is simplified, and an inexpensive fuel supply device 1 can be provided.

  Note that the diameter of the pumped fuel filter 99R is made larger than the diameter of the pumped fuel filters 99a and 99P, thereby increasing the filtration area of the pumped fuel filter 99R. Thereby, the filter life of the pumped fuel filter 99R can be further extended.

(Eighth embodiment)
A seventh embodiment of the present invention will be described with reference to FIGS.

  In the filter assembly 7S of the present embodiment, as shown in FIG. 21, an extension part 73S extending to the left side is provided, the upper opening 83S is extended to the extension part 73S, and the supply fuel filter 86S is extended to the extension part 73S. Expand and enlarge.

  As shown in FIG. 22, the filter assembly 7S includes a case 70S, a supply fuel filter 86S, and a pumping fuel filter 99P. The filter assembly 7S is fixed to the sub tank 4 by press-fitting the cylindrical portion 91P into the opening 43 of the sub tank 4. The case 70S is formed by press-fitting the upper case 8S into the lower case 9S. Also in this embodiment, the second partition wall 82S is provided on the upper case 8S, the protrusion 94S is provided on the lower case 9S, and the upper case 8S and the lower case 9S are assembled together to form the case 70S. The partition wall 82S and the projection 94S form a partition wall 702S.

  The protruding portion 94S is formed in the shape shown in FIG. 23, and although not shown, the second partition wall 82S is also formed in the same shape as the protruding portion 94S. As shown in FIG. 23, in the lower case 9S, an extension part 98S corresponding to the extension part 73S is provided, and the supply fuel flow path 71S and the pumping fuel flow path 72S are formed by being divided by the protrusion 94S. Although not shown, the upper case 8S is also provided with an extending portion corresponding to the extending portion 73S, and is divided by a second partition wall 82S formed in the same shape as the protruding portion 94S, and is separated from the supply fuel flow path 71S. A pumping fuel flow path 72S is formed.

  The supply fuel filter 86S is also a nonwoven fabric formed of the same material as the fuel filters 86, 86P, 99, and 99P, and is joined to the upper opening 83S by welding, for example. As described above, the upper opening 83S shown in FIGS. 21 and 22 is extended to the extending portion 73S and enlarged. Thereby, the supply fuel filter 86S is enlarged, and the filtration area of the supply fuel filter 86P is increased. Therefore, the filter life of the supply fuel filter 86S can be extended.

  Note that the filter area of the supply fuel filter 86P can be increased by making the filter assembly other than the filter assembly 7S provided with the extending portion 73S.

It is sectional drawing which shows the fuel supply apparatus by 1st Embodiment of this invention. It is sectional drawing of the filter assembly of 1st Embodiment. FIG. 3 is a view in the direction of arrow III in FIG. 2. It is the IV-IV sectional view taken on the line in FIG. It is sectional drawing of the filter assembly by 2nd Embodiment of this invention. It is a top view of the pumping-up fuel filter provided in the filter assembly of FIG. It is sectional drawing of the filter assembly by 3rd Embodiment of this invention. It is a top view of the pumping-up fuel filter provided in the filter assembly of FIG. It is sectional drawing of the filter assembly by 4th Embodiment of this invention. It is a principal part side view of the filter assembly of FIG. It is sectional drawing of the filter assembly by the modification of 4th Embodiment. It is a fragmentary sectional view which shows the fuel supply apparatus by 5th Embodiment of this invention. It is a top view of the filter assembly by a 5th embodiment of the present invention. It is the XIV-XIV sectional view taken on the line in FIG. It is a XV direction arrow directional view in FIG. It is a top view of the lower case in FIG. It is a top view of the filter assembly by a 6th embodiment of the present invention. It is the XVIII-XVIII sectional view taken on the line in FIG. It is the XIX-XIX sectional view taken on the line in FIG. It is sectional drawing of the filter assembly by 7th Embodiment of this invention. It is a top view of the filter assembly by an 8th embodiment of the present invention. FIG. 22 is a sectional view taken along line XXII-XXII in FIG. 21. It is a top view of the lower case in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fuel supply apparatus, 2 Fuel tank, 22 Bottom face, 3 Flange 4, 4R Sub tank, 41 Bottom face (inner surface), 42 Side wall, 43 Opening part 44R Cylindrical part, 5 Pump unit, 51 Filter case, 52 Fuel filter 6 Fuel pump, 60 arm part, 601 locked hole, 61 supply pump part 62 pumping pump part, 63 electric motor part, 64 impeller 65 supply pump part (first pump part), 651 supply pump suction port (first suction port) )
652 Supply pump discharge port, 66 Pumping pump part (second pump part)
661 Pumping pump suction port (second suction port), 662 Pumping pump discharge port 67 Pressure regulator, 68 Discharge port 7, 7P, 7Q, 7R, 7S Filter assembly (filter member)
70P, 70Q, 70R, 70S Case, 701P Claw 702P, 702S Partition wall, 71, 71P, 71S Supply fuel flow path (first flow path)
72, 72P, 72R, 72S Pumping fuel flow path (second flow path), 73S Extension part 8, 8P, 8S Upper case (case), 81 Upper end part 82, 82P, 82S Second partition wall (partition wall, upper side) Partition wall)
83, 83P, 83Q, 83S Upper side opening (first inlet), 831Q Notch 84, 84P First connection (first outlet), 85, 85P Second connection (second outlet)
86, 86P, 86Q, 86S Supply fuel filter (first filter medium)
9, 9P, 9Q, 9R, 9S Lower case (case), 91, 91P, 91R Cylindrical portion 92, 92P, 92R Lower opening (second inlet portion), 93 First partition wall 94, 94P, 94S Projection Part (partition wall, lower partition wall), 95 through hole 96, 96P flange part, 97Q notch part, 98S extension part 99, 99P, 99R pumping fuel filter (second filter medium)
991P, 991R Ring member, 992P, 992R Filter body 100 Check valve

Claims (27)

A first pump unit housed in a fuel tank and housed in a sub-tank that accumulates a part of the fuel, sucks fuel in the sub-tank and supplies it to a fuel consuming device, and sucks fuel outside the sub-tank and pumps it into the sub-tank A fuel supply device comprising a fuel pump having a second pump part,
Supply fuel supplied to the fuel consuming device and pumped up into the sub-tank connected to the first suction port of the first pump portion and the second suction port of the second pump portion of the fuel pump A filter member for filtering,
The filter member is provided with a partition wall inside, whereby a first flow path for guiding fuel in the sub-tank to the first suction port and a second flow for guiding fuel outside the sub-tank to the second suction port. One case in which two flow paths of the path are formed, a first filter medium provided in the first flow path for filtering the supply fuel, and a pumping fuel provided in the second flow path for filtering the pumping fuel And a second filter medium.   In the case of the filter member, the first inlet portion of the first flow path opens into the sub tank, the second inlet portion of the second flow path projects outward from the bottom surface of the sub tank, and the fuel tank The fuel supply device according to claim 1, wherein the fuel supply device is attached to the bottom surface of the sub tank so as to open toward the bottom surface of the sub tank. An opening is formed in the bottom surface of the sub tank,
The fuel supply device according to claim 2, wherein the case of the filter member is inserted into and fixed to the opening. The side wall of the case has a larger outer diameter than the opening, and when the case is inserted into the opening, a flange is formed that contacts the bottom surface of the sub tank.
4. The fuel supply according to claim 3, wherein the first inlet portion is formed closer to the sub tank than the flange portion, and the second inlet portion is formed outside the sub tank relative to the flange portion. apparatus.   The fuel according to any one of claims 2 to 4, wherein the first filter medium is provided at the first inlet portion, and the second filter medium is provided at the second inlet portion. Feeding device. A fuel passage that communicates the outside and the inside of the side wall is formed in the side wall of the second inlet portion,
The fuel supply device according to claim 5, wherein the second filter medium is provided so as to cover the second inlet portion and the fuel passage. A first pump unit housed in a fuel tank and housed in a sub-tank that accumulates a part of the fuel, sucks fuel in the sub-tank and supplies it to a fuel consuming device, and sucks fuel outside the sub-tank and pumps it into the sub-tank A fuel supply device comprising a fuel pump having a second pump part,
Supply fuel supplied to the fuel consuming device and pumped up into the sub-tank connected to the first suction port of the first pump portion and the second suction port of the second pump portion of the fuel pump A filter member for filtering,
The filter member is provided with a partition wall in the interior thereof, so that the fuel outside the sub tank is passed through the first flow path for guiding the fuel in the sub tank to the first suction port, and the opening formed in the sub tank. One case in which two flow paths of the second flow path leading to the second suction port are formed, a first filter medium provided in the first flow path for filtering the supply fuel, and filtering the pumping fuel A second filter medium to
The fuel supply device, wherein the second filter medium is provided so as to cover the opening.   In the case of the filter member, the first inlet portion of the first flow path opens into the sub tank, the second inlet portion of the second flow path projects outward from the bottom surface of the sub tank, and the fuel tank The fuel supply device according to claim 7, wherein the fuel supply device is attached to the bottom surface of the sub tank so as to open toward the bottom surface of the sub tank. The opening is formed in the bottom surface of the sub tank,
The fuel supply device according to claim 8, wherein the case of the filter member is inserted into and fixed to the opening. The side wall of the case has a larger outer diameter than the opening, and when the case is inserted into the opening, a flange is formed that contacts the bottom surface of the sub tank.
The fuel supply according to claim 9, wherein the first inlet portion is formed closer to the sub tank than the flange portion, and the second inlet portion is formed outside the sub tank relative to the flange portion. apparatus.   11. The fuel supply device according to claim 8, wherein the first filter medium is provided at the first inlet portion. 11.   The fuel supply device according to claim 11, wherein a fuel passage that communicates the outside and the inside of the side wall is formed in the side wall of the second inlet portion. A first pump unit housed in a fuel tank and housed in a sub-tank that accumulates a part of the fuel, sucks fuel in the sub-tank and supplies it to a fuel consuming device, and sucks fuel outside the sub-tank and pumps it into the sub-tank A fuel supply device comprising a fuel pump having a second pump part,
Supply fuel supplied to the fuel consuming device and pumped up into the sub-tank connected to the first suction port of the first pump portion and the second suction port of the second pump portion of the fuel pump A filter member for filtering,
The filter member is provided with a partition wall in the interior thereof, so that the fuel outside the sub tank is passed through the first flow path for guiding the fuel in the sub tank to the first suction port, and the opening formed in the sub tank. One case in which two flow paths of the second flow path leading to the second suction port are formed, a first filter medium for filtering the supply fuel, and the pumping fuel provided in the second flow path A second filter medium to
The fuel supply device, wherein the second filter medium is disposed in parallel to an inner surface of the sub tank in which the opening is formed.   The fuel supply device according to claim 13, wherein the first filter medium is provided in the first flow path.   15. The fuel supply device according to 14, wherein the first filter medium is disposed in parallel with the second filter medium.   The fuel supply device according to claim 15, wherein the first filter medium and the second filter medium are plate-shaped filter media. The inner surface is a bottom surface of the sub-tank;
In the case of the filter member, a first inlet portion of the first flow path opens into the sub-tank, a second inlet portion of the second flow path projects outward from the bottom surface, and a bottom surface of the fuel tank The fuel supply device according to claim 14, wherein the fuel supply device is attached to the bottom surface so as to open toward the bottom.   The fuel supply device according to claim 17, wherein the case of the filter member is inserted into and fixed to the opening. The side wall of the case has a larger outer diameter than the opening, and when the case is inserted into the opening, a flange is formed that contacts the bottom surface of the sub tank.
The fuel supply according to claim 18, wherein the first inlet portion is formed on the sub tank side with respect to the flange portion, and the second inlet portion is formed on the outer side of the sub tank with respect to the flange portion. apparatus.   The fuel according to any one of claims 17 to 19, wherein the first filter medium is provided at the first inlet portion, and the second filter medium is provided at the second inlet portion. Feeding device. A fuel passage that communicates the outside and the inside of the side wall is formed in the side wall of the second inlet portion,
21. The fuel supply device according to claim 20, wherein the second filter medium is provided so as to cover the second inlet portion and the fuel passage. The first suction port and the second suction port of the fuel pump are formed at one end of the fuel pump;
A first outlet portion of the first flow path connected to the first suction port and a second outlet portion of the second flow path connected to the second suction port are opposed to the one end portion of the fuel pump. The fuel supply device according to any one of claims 1 to 21, wherein the fuel supply device is formed at an end portion.   23. The check valve according to any one of claims 1 to 22, wherein the second flow path is provided with a check valve that allows only fuel to flow from outside the sub-tank into the sub-tank. Fuel supply device.   The fuel supply device according to claim 23, wherein the check valve is provided downstream of the second filter medium. The case includes an upper case having an upper partition wall, and a lower case having the lower partition wall and assembled with the upper case to form the case,
The upper partition wall and the lower partition wall form the partition wall by assembling the upper case and the lower case together to form the case. The fuel supply device according to claim 1.   26. The fuel supply device according to claim 25, wherein the upper case and the lower case are assembled together by press fitting to form the case.   27. The fuel supply device according to claim 1, wherein a filtration area of the second filter medium is set larger than a filtration area of the first filter medium.

Images