JP2012072663A - Fuel supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel supply device capable of maintaining a discharge amount of a fuel pump, even when a fuel pump is provided in a sub tank.SOLUTION: The fuel supply device includes: a main tank 51 storing fuel; a sub tank 60 provided below the main tank 51 and supplied with the fuel from the main tank 51; a fuel pump 70 provided in the sub tank 60 and supplying the fuel to an engine 15; and a regulator 85 adjusting a pressure of the fuel discharged from the fuel pump 70. A partition 63 separating a first space 64A supplied with the fuel from the main tank 51 and supplying the fuel to the fuel pump 70 from a second space 64B that is the space other than the first space 64A is provided in the sub tank 60. A degassing hole 75 discharging gas generated in the fuel pump 70 to the second space 64B or a fuel discharge hole 86 discharging surplus fuel of the regulator 85 to the second space 64B is provided in the second space 64B. A return hose 82 for returning the fuel from the second space 64B of the sub tank 60 to the main tank 51 is provided.

Description

  The present invention relates to a fuel supply device for a saddle riding type vehicle.

  Conventional fuel supply devices include a tank rail that forms the upper part of the vehicle body frame, an engine that is disposed on the vehicle body frame below the tank rail, a main tank that is disposed across the tank rail, and a main fuel pipe. There is known a system including a sub tank connected to the tank and a fuel pump built in the sub tank and supplying fuel in the sub tank to the engine (see, for example, Patent Document 1).

JP 2007-153071 A

  By the way, in the fuel supply apparatus described in Patent Document 1, the fuel sucked into the fuel pump provided in the sub-tank is not only the low-temperature fuel supplied from the main tank, but also warmed from the fuel pump and the regulator. Since a large amount of fuel is contained, there is a possibility that the discharge amount of the fuel pump is reduced as compared with the case where the fuel pump is provided in the main tank.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a fuel supply device capable of maintaining the discharge amount of the fuel pump even if the fuel pump is provided in the sub tank. is there.

  In order to achieve the above object, an invention according to claim 1 is directed to a main tank for storing fuel, a sub tank provided below the main tank, supplied with fuel from the main tank, provided in the sub tank, In a fuel supply device comprising a fuel pump that supplies fuel to an engine and a regulator that regulates the pressure of fuel discharged from the fuel pump, fuel is supplied from the main tank into the sub-tank, and fuel is supplied to the fuel pump A partition that separates the first space and the second space, which is a space other than the first space, is provided, and a deaeration hole or a regulator that discharges gas generated in the fuel pump to the second space in the second space A fuel discharge hole for discharging the excess fuel into the second space, and a return hose for returning the fuel from the second space of the sub tank to the main tank. To.

  The invention according to claim 2 is characterized in that, in addition to the structure according to claim 1, the partition wall is provided with a communication hole for communicating the first space and the second space.

  The invention according to claim 3 is characterized in that, in addition to the configuration according to claim 1 or 2, the first space is provided at a lower end portion of the sub tank, and a primary filter is provided in the first space. .

  According to a fourth aspect of the present invention, in addition to the configuration of the first or second aspect, the partition wall is a pipe that connects a fuel supply port that supplies fuel to the first space and a suction port of the fuel pump. Features.

  The invention according to claim 5 is characterized in that, in addition to the configuration according to claim 4, a primary filter is provided in a fuel supply hose that supplies fuel from the main tank to the sub tank.

  The invention according to claim 6 is the one-way valve, in addition to the structure according to any one of claims 1 to 5, wherein the return hose is connected to the lower surface of the main tank and prevents the fuel from flowing back to the return hose. Is provided.

  According to a seventh aspect of the present invention, in addition to the configuration of the second aspect, the communication hole has a passage area through which less fuel can pass than the fuel discharged from the deaeration hole and the fuel discharge hole into the second space. It is characterized by.

  According to the first aspect of the present invention, the partition wall that separates the first space in which fuel is supplied from the main tank and supplies fuel to the fuel pump, and the second space other than the first space, into the sub tank. And a deaeration hole for discharging gas generated in the fuel pump to the second space or a fuel discharge hole for discharging surplus fuel of the regulator to the second space is disposed in the second space, and the second space of the sub tank. Since the return hose for returning the fuel to the main tank is provided, most of the fuel sucked into the fuel pump becomes relatively low temperature fuel supplied from the main tank, and the discharge amount of the fuel pump can be maintained.

  According to the second aspect of the present invention, the partition wall is provided with the communication hole that communicates the first space and the second space, so that even if the fuel in the main tank runs out, the fuel in the sub tank is used as a spare. Can do.

  According to the invention of claim 3, the first space is provided at the lower end of the sub-tank, and the primary filter is provided in the first space, so that a large primary filter is disposed in the first space in a compact manner. Can do.

  According to the invention of claim 4, since the partition wall is a pipe connecting the fuel supply port for supplying fuel to the first space and the suction port of the fuel pump, the length in the front-rear direction of the engine can be shortened. it can.

  According to the invention of claim 5, since the primary filter is provided in the fuel supply hose that supplies fuel from the main tank to the sub tank, the primary filter is disposed outside the sub tank. Thereby, replacement | exchange of a primary filter can be made easy.

  According to the sixth aspect of the present invention, the return hose is connected to the lower surface of the main tank, and the return hose is provided with the one-way valve for preventing the reverse flow of the fuel. Entrainment of air when fuel is discharged from the hose into the main tank can be prevented.

  According to the seventh aspect of the present invention, the communication hole is a passage area through which less fuel than the fuel discharged from the deaeration hole and the fuel discharge hole to the second space can pass, and therefore, the communication hole is mixed into the fuel in the main tank. It is possible to prevent dust from entering the second space through the communication hole.

1 is a left side view of a motorcycle on which a first embodiment of a fuel supply device according to the present invention is mounted. FIG. 2 is an enlarged left side view around a main tank and a sub tank in FIG. 1. It is the schematic of the fuel supply apparatus of 1st Embodiment. FIG. 4 is a partially cutaway cross-sectional view of the sub tank shown in FIG. 3. It is the schematic of the modification of the fuel supply apparatus of 1st Embodiment. It is the schematic explaining 2nd Embodiment of the fuel supply apparatus which concerns on this invention. It is a partially cutaway sectional view of the sub tank shown in FIG. It is the schematic of the modification of the fuel supply apparatus of 2nd Embodiment.

  Hereinafter, embodiments of a fuel supply apparatus according to the present invention will be described in detail with reference to the drawings. Note that the drawings are viewed in the direction of the reference numerals, and in the following description, front and rear, left and right, and top and bottom follow the directions viewed from the driver.

(First embodiment)
First, with reference to FIGS. 1-5, 1st Embodiment of the fuel supply apparatus which concerns on this invention is described.

  As shown in FIG. 1, the motorcycle 10 of the present embodiment includes a main frame 11, a head pipe 12 provided at a front portion of the main frame 11, a front fork 13 attached to the head pipe 12 so as to be steerable, A handle 14 attached to the upper part of the front fork 13, a front wheel WF attached to the lower part of the front fork 13, an engine 15 suspended from the main frame 11, an exhaust pipe 17 for flowing exhaust gas of the engine 15 to the muffler 16, A main tank 51 that is attached to the main frame 11 and stores fuel, occupant seats 19A and 19B disposed behind the main tank 51, and a rear portion of the main frame 11 are attached to the rear of the main frame 11 so as to be movable up and down. Swing arm 22 and the swing arm 22 And a rear wheel WR eclipsed.

  Further, the drive system will be described. A reduction gear 23 is provided below the engine 15, a drive shaft 24 extends rearward from the reduction gear 23, and a shaft 25 of the rear wheel WR is provided on the output side of the drive shaft 24. Are concatenated. As a result, the driving force of the engine 15 is decelerated by the speed reducer 23 and transmitted to the shaft 25 of the rear wheel WR via the driving shaft 24.

  In FIG. 1, reference numeral 31 is a headlight, 32 is a front winker, 33 is a side mirror, 34 is a rear winker, 35 is a front fender, 36 is a rear fender, and 37 is an air cleaner.

  The motorcycle 10 includes a fuel supply device 50 that supplies the fuel in the main tank 51 to the engine 15. The fuel supply device 50 includes the main tank 51, as shown in FIGS. A sub tank 60 provided below the main tank 51 and supplied with fuel from the main tank 51, a fuel pump 70 provided in the sub tank 60 for supplying fuel to the engine 15, and a fuel in the main tank 51 for sub tank 60 A fuel supply hose 81 for supplying the fuel to the main tank 51, and a discharge hose 83 for sending the fuel discharged from the fuel pump 70 to the engine 15.

  The return hose 82 is provided so as to penetrate the lower surface 51 a of the main tank 51, and the opening 82 a at the downstream end (upper end) is above the fuel level UL when the main tank 51 is full. Is arranged.

  As shown in FIGS. 3 and 4, the sub tank 60 is provided in the tank main body 61, a substantially bottomed cylindrical tank main body 61, a lid member 62 that closes the upper opening of the tank main body 61, and the sub tank 60. Partition wall 63 that separates the space into a first space 64A below and a second space 64B above.

  The lid member 62 includes a fuel supply hose connection portion 65 to which the fuel supply hose 81 is connected, a return hose connection portion 66 to which the return hose 82 is connected, and a discharge hose connection portion 67 to which the discharge hose 83 is connected. Prepare. The fuel supply hose connection portion 65, the return hose connection portion 66, and the discharge hose connection portion 67 are respectively erected upward from the upper surface of the lid member 62. Further, the return hose connection portion 66 communicates with the second space 64B.

  Further, a bypass pipe 68 that connects the fuel supply hose connection section 65 and the first space 64A is connected to the downstream end of the fuel supply hose connection section 65. The bypass pipe 68 moves up and down the second space 64B. It arrange | positions so that it may penetrate. As a result, fuel is supplied from the main tank 51 to the first space 64 </ b> A via the fuel supply hose 81, the fuel supply hose connection portion 65, and the bypass pipe 68.

  Further, the partition wall 63 is formed with a through hole 63a that communicates with the fuel supply port 68a that is the downstream end of the bypass pipe 68, and a communication hole 63b that communicates the first space 64A and the second space 64B.

  As shown in FIG. 4, the fuel pump 70 is disposed in the second space 64 </ b> B, and is disposed in the housing 71, the pump chamber 72 formed in the lower portion of the housing 71, and the pump chamber 72, not shown. An impeller (not shown) that is rotationally driven by the motor of the motor, a suction port 74 that is formed at the lower end portion of the housing 71 and sends fuel to the pump chamber 72, and a lower end portion of the housing 71, and the impeller rotates to rotate the pump. A deaeration hole 75 that discharges gas (vapor) generated in the chamber 72 to the second space 64 </ b> B, and a fuel discharge passage 76 that sends fuel discharged from the pump chamber 72 to the discharge hose connection portion 67. Further, the deaeration hole 75 is disposed in the second space 64B.

  A strainer 78, which is a primary filter, is connected to the suction port 74 of the fuel pump 70 via a connection pipe 77. The strainer 78 is disposed in a first space 64A provided at the lower end of the sub tank 60. ing. As a result, the fuel in the first space 64 </ b> A is supplied to the fuel pump 70 via the connection pipe 77 and the strainer 78. Further, the partition wall 63 is formed with an insertion hole 63c through which the connection pipe 77 is inserted. The discharge hose 83 is provided with a high-pressure filter 79 that is a secondary filter.

  The fuel discharge passage 76 is provided with a regulator 85 that adjusts the pressure of the fuel discharged from the fuel pump 70. The regulator 85 removes surplus fuel generated when the fuel pressure is adjusted from the second fuel 85. A fuel discharge hole 86 for discharging to the space 64B is provided. Further, the fuel discharge hole 86 is disposed in the second space 64B.

  In this embodiment, the communication hole 63b of the partition wall 63 has a passage area through which less fuel can pass than the fuel discharged from the deaeration hole 75 of the fuel pump 70 and the fuel discharge hole 86 of the regulator 85 into the second space 64B. Is set.

  In the fuel supply device 50 configured as described above, the warm fuel discharged from the deaeration hole 75 of the fuel pump 70 and the fuel discharge hole 86 of the regulator 85 is discharged into the second space 64B. Since the relatively low temperature fuel supplied from the main tank 51 to the first space 64A is sucked, the discharge amount of the fuel pump 70 is maintained. Further, the dust mixed in the fuel in the main tank 51 stays in the first space 64A and does not enter the second space 64B, so that the fuel pump 70 sucks the dust from the deaeration hole 75. There is no.

  As described above, according to the fuel supply device 50 of the present embodiment, the fuel is supplied from the main tank 51 into the sub tank 60, and the first space 64A for supplying the fuel to the fuel pump 70, and the first space 64A. A partition wall 63 that separates the second space 64B, which is a space other than the first space 64B, is provided. In the second space 64B, a deaeration hole 75 that discharges gas generated in the fuel pump 70 to the second space 64B, and a regulator 85 A fuel discharge hole 86 for discharging surplus fuel into the second space 64B is disposed, and a return hose 82 for returning the fuel from the second space 64B of the sub tank 60 to the main tank 51 is provided, so that most of the fuel sucked into the fuel pump 70 Becomes a relatively low temperature fuel supplied from the main tank 51, and the discharge amount of the fuel pump 70 can be maintained. Further, it is possible to prevent the dust mixed in the fuel in the main tank 51 from being sucked into the fuel pump 70 from the deaeration hole 75.

  Further, according to the fuel supply device 50 of the present embodiment, the partition 63 is provided with the communication hole 63b that communicates the first space 64A and the second space 64B, so even if the fuel in the main tank 51 runs out. The fuel in the sub tank 60 can be used as a backup.

  Further, according to the fuel supply device 50 of the present embodiment, since the strainer 78 is provided in the first space 64A provided at the lower end portion of the sub tank 60, it is possible to arrange the large strainer 78 in the first space 64A in a compact manner. it can.

  Further, according to the fuel supply device 50 of the present embodiment, the communication hole 63b of the partition wall 63 has less fuel than the fuel discharged from the deaeration hole 75 of the fuel pump 70 and the fuel discharge hole 86 of the regulator 85 into the second space 64B. Therefore, the dust mixed in the fuel in the main tank 51 can be prevented from entering the second space 64B through the communication hole 63b.

  As a modification of the present embodiment, as shown in FIG. 5, an opening 82 a at the downstream end (upper end) of the return hose 82 is connected to the lower surface 51 a of the main tank 51 so that the fuel flows back to the return hose 82. A one-way valve 87 for blocking may be provided. According to this modification, the return hose 82 can be shortened, and air entrainment when fuel is released from the return hose 82 into the main tank 51 can be prevented.

(Second Embodiment)
First, with reference to FIGS. 6-8, 2nd Embodiment of the fuel supply apparatus which concerns on this invention is described. Note that portions that are the same as or equivalent to those of the first embodiment are denoted by the same reference numerals in the drawings, and description thereof is omitted or simplified.

  In this embodiment, as shown in FIGS. 6 and 7, a U-shaped pipe 90 includes a fuel supply port 68a of the bypass pipe 68 that supplies fuel to the first space 64A and a suction port 74 of the fuel pump 70. The pipe 90 constitutes the partition wall of the present embodiment, the space inside the pipe 90 is the first space 64A, and the space outside the pipe 90 is the second space 64B. In addition, the pipe 90 is formed with a communication hole 91 that communicates the first space 64A and the second space 64B. Furthermore, in the present embodiment, a primary filter 92 is provided in the fuel supply hose 81.

  In the present embodiment, the communication hole 91 of the pipe 90 has a passage area through which less fuel can pass than the fuel discharged from the deaeration hole 75 of the fuel pump 70 and the fuel discharge hole 86 of the regulator 85 into the second space 64B. Is set.

  As described above, according to the fuel supply device 50 of the present embodiment, the fuel is supplied from the main tank 51 into the sub tank 60, and the first space 64A for supplying the fuel to the fuel pump 70, and the first space 64A. A pipe 90 that is a partition wall that separates the second space 64B that is a space other than the first space 64B is provided, and a deaeration hole 75 that discharges the gas generated in the fuel pump 70 to the second space 64B in the second space 64B, and A fuel discharge hole 86 for discharging surplus fuel of the regulator 85 to the second space 64B is disposed, and a return hose 82 for returning fuel from the second space 64B of the sub tank 60 to the main tank 51 is provided, so that the fuel sucked into the fuel pump 70 Most of the fuel is relatively low temperature fuel supplied from the main tank 51, and the discharge amount of the fuel pump 70 can be maintained. Further, it is possible to prevent the dust mixed in the fuel in the main tank 51 from being sucked into the fuel pump 70 from the deaeration hole 75.

  Further, according to the fuel supply device 50 of the present embodiment, the partition wall is the pipe 90 that connects the fuel supply port 68a of the bypass pipe 68 that supplies fuel to the first space 64A and the suction port 74 of the fuel pump 70. Therefore, the length of the engine 15 in the front-rear direction can be shortened.

Further, according to the fuel supply device 50 of the present embodiment, the primary filter 92 is provided in the fuel supply hose 81 that supplies fuel from the main tank 51 to the sub tank 60, so the primary filter 92 is outside the sub tank 60. Be placed. Thereby, replacement | exchange of the primary filter 92 can be made easy.
About another structure and an effect, it is the same as that of the said 1st Embodiment.

  As a modification of the present embodiment, as shown in FIG. 8, an opening 82 a at the downstream end (upper end) of the return hose 82 is formed on the lower surface 51 a of the main tank 51, as in the modification of the first embodiment. The return hose 82 may be connected to provide a one-way valve 87 that prevents reverse flow of fuel.

DESCRIPTION OF SYMBOLS 15 Engine 50 Fuel supply apparatus 51 Main tank 51a Lower surface 60 Sub tank 61 Tank main body 62 Cover member 63 Bulkhead 63b Communication hole 64A 1st space 64B 2nd space 68 Bypass pipe 68a Fuel supply port 70 Fuel pump 74 Suction port 75 Deaeration hole 78 Strainer (Primary filter)
81 Fuel supply hose 82 Return hose 83 Discharge hose 85 Regulator 86 Fuel discharge hole 87 One-way valve 90 Pipe (partition wall)
91 Communication hole 92 Primary filter

Claims (7)

A main tank (51) for storing fuel;
A sub tank (60) provided below the main tank and supplied with fuel from the main tank;
A fuel pump (70) provided in the sub-tank and supplying fuel to the engine (15);
A fuel supply device (50) comprising a regulator (85) for adjusting the pressure of fuel discharged from the fuel pump;
In the sub tank, fuel is supplied from the main tank, and a first space (64A) for supplying fuel to the fuel pump is separated from a second space (64B) that is a space other than the first space. A partition wall (63) is provided;
A deaeration hole (75) for discharging gas generated in the fuel pump to the second space or a fuel discharge hole (86) for discharging surplus fuel of the regulator to the second space is disposed in the second space. And
A fuel supply device comprising a return hose (82) for returning fuel from the second space (64B) of the sub tank (60) to the main tank (51).   The fuel according to claim 1, wherein the partition wall (63, 90) is provided with a communication hole (63b, 91) for communicating the first space (64A) and the second space (64B). Feeding device. The first space (64A) is provided at a lower end of the sub tank (60),
The fuel supply apparatus according to claim 1 or 2, wherein a primary filter (78) is provided in the first space.   The partition wall is a pipe (90) connecting a fuel supply port (68a) for supplying fuel to the first space (64A) and a suction port (74) of the fuel pump (70). The fuel supply device according to claim 1 or 2.   The fuel supply device according to claim 4, wherein a primary filter (92) is provided in a fuel supply hose (81) for supplying fuel from the main tank (51) to the sub tank (60). The return hose (82) is connected to the lower surface (51a) of the main tank,
The fuel supply device according to any one of claims 1 to 5, wherein the return hose (82) is provided with a one-way valve (87) for preventing back flow of fuel.   The communication hole (63b, 91) has a passage area through which less fuel can pass than the fuel discharged from the deaeration hole (75) and the fuel discharge hole (86) into the second space (64B). The fuel supply apparatus according to claim 2, wherein

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