JP2008075528A - Mounting structure for fuel supply device for motorcycle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel supply device for a motorcycle capable of satisfactorily performing hill-climbing operation and quick acceleration operation under a condition where a little fuel remains in a fuel tank. <P>SOLUTION: An opening Tb of a bottom part Ta of a fuel tank T is blocked by a flange part 1a of a cover member 1. A fuel pump P and a fuel filter F are arranged in a bottomed cup shape filter storage case 5 projecting upward from the flange part 1a and arranged in the fuel tank T. A fuel supply hole 6 and an opening Pa1 to an inside of the filter storage case 5 of a pump suction path Pa of the fuel pump P bored on a side wall of the filter storage case 5 open in one side A of a longitudinal axial line X-X of the fuel pump P. Also, the fuel supply hole 6 and the opening Pa1 of the pump suction path Pa of the fuel pump P are arranged in a rear side C of a motorcycle traveling direction B in reference to the longitudinal axial line X-X of the fuel pump P under a condition where the same are attached to the fuel tank T. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an in-tank type fuel supply device that sucks and boosts fuel in a fuel tank by a fuel pump disposed in the fuel tank, and supplies the boosted fuel toward a fuel injection valve. In particular, the present invention relates to a structure for attaching a fuel supply device to a fuel tank disposed in a motorcycle.

There is Japanese Patent Application No. 2006-074551 filed by the present applicant as a conventional fuel supply device for a motorcycle. According to this, a bottomed cup-shaped filter storage case is erected and arranged on the collar portion of the lid member, and a pump suction path and a pump discharge path are provided inside the substantially sealed filter storage case. A fuel pump and a fuel filter connected to the pump suction path are arranged. Also, an opening is formed in the lower bottom portion of the fuel tank, and the filter storage case is inserted and disposed in the fuel tank through the opening, and the opening is closed and held by a lid member, whereby the fuel filter, fuel A pump is housed in the fuel tank. The fuel stored in the fuel tank flows into the filter storage case by the gravity from the fuel supply hole opened in the side wall of the filter storage case, and the fuel in the filter storage case is absorbed by the fuel filter. The foreign matter is removed, clean fuel is sucked into the pump portion of the fuel pump from the pump suction passage, and the pressure is increased. .
Japanese Patent Application No. 2006-074551

  As described above, such a fuel supply device is integrally attached to the fuel tank constituting the motorcycle. If the fuel supply device is inadvertently attached to the fuel tank at this time, the following problems are caused. May occur. That is, the amount of residual fuel in the fuel tank is small, a large load is continuously applied to the engine, and the amount of fuel consumption is large, and the fuel level in the fuel tank is further inclined. In some cases, sufficient fuel cannot be continuously supplied from the fuel pump toward the fuel injection valve. This is the case, for example, when a steep hill is continuously climbed in a state where there is little residual fuel in the fuel tank. In such a state, the fuel in the fuel tank has a large inclined liquid surface formed in the vicinity of the bottom thereof, and the fuel supply hole or fuel drilled in the side wall of the filter storage case that projects from the fuel tank. This is because the opening of the pump suction passage of the pump may be opened near the inclined liquid surface or may be opened above the inclined liquid surface. According to this, fuel is supplied from the fuel supply hole into the filter storage case. Or the intake of fuel from the pump intake passage to the pump section may decrease. In addition, the fuel level in the fuel tank fluctuates greatly even during a sudden acceleration operation or a wheelie operation in which the front wheels are lifted up when there is little residual fuel in the fuel tank. There is a risk of malfunction. In order to eliminate such problems, the shape of the fuel tank is changed, but this increases the mold cost. In addition, the external shape of the fuel tank changes and it is necessary to review the design of the motorcycle, which requires a great deal of development man-hours.

  The present invention has been made in view of the above-mentioned problems. By optimally setting the arrangement of the fuel supply device, even when the amount of residual fuel in the fuel tank is small, the fuel can be supplied appropriately. An object of the present invention is to provide a fuel supply device for a two-wheeled vehicle that can be performed toward a valve, and particularly capable of satisfactorily performing uphill operation, rapid acceleration operation, and wheelie operation.

  In order to achieve the above object, the fuel supply device mounting structure for a motorcycle according to the present invention has a bottomed cup-shaped filter storage case erected upward from a lid member that closes the opening at the bottom of the fuel tank. In addition, a fuel pump having a pump suction path and a pump discharge path and a fuel filter connected to the pump suction path are housed and disposed in the filter storage case, and the filter storage case is opened to the fuel tank. In the fuel supply device which is inserted and arranged in the fuel tank and closes the opening with a lid member, the opening into the filter storage case of the pump suction path of the fuel pump and the side wall of the filter storage case are drilled. When the fuel supply hole that connects the inside of the fuel tank and the inside of the filter storage case is opened to one side of the longitudinal axis of the fuel pump Moni, the opening and the fuel supply hole of the pump intake passage of the fuel pump, the longitudinal axial line of the fuel pump based on the first, characterized in that arranged on the rear side with respect to the traveling direction of the motorcycle.

  Further, in addition to the first feature, the present invention has a second feature that the position of the opening of the pump suction passage of the fuel pump is disposed below the fuel supply hole in the weight direction.

  According to the first feature of the present invention, the fuel stored in the fuel tank during a climbing operation or a sudden acceleration operation of the motorcycle is received by the inertial force, the traveling direction side is low, and the lateral side is high An upward sloping liquid surface is formed. On the other hand, the opening of the pump suction passage of the fuel pump and the fuel supply hole formed in the side wall of the filter storage case are opened to one side from the longitudinal axis of the fuel pump, and both the openings are the longitudinal axis of the fuel pump. It is arranged on the rear side of the motorcycle with respect to the line. According to the above, both the openings can be arranged below the inclined liquid level even in the operation state in which the amount of fuel remaining in the fuel tank is small, and the fuel in the fuel tank can be surely placed in the filter storage case. The fuel pump can suck fuel into the pump portion from the opening of the pump suction passage, and can supply sufficient fuel toward the fuel injection valve even during such operation, so that the operation can be performed well. Can do.

  Further, according to the second feature of the present invention, since the opening of the pump suction passage is disposed at a position below the fuel supply hole in the direction of gravity, sufficient fuel is supplied during the climbing operation and acceleration operation of the motorcycle. The time that can be supplied toward the fuel injection valve can be further increased.

  Hereinafter, an embodiment of a fuel supply device mounting structure in a motorcycle according to the present invention will be described with reference to the drawings. The fuel supply unit FU will be described with reference to FIG. Reference numeral 1 denotes a lid member that closes an opening Tb formed in the bottom portion Ta of the fuel tank T, and a flange portion 1a that is in contact with the bottom portion Ta, and an annular protrusion that protrudes upward from the flange portion 1a. A portion 1b and a concave portion 1c that is recessed downward from the flange portion 1a are provided. P is a fuel pump that includes a pump suction path Pa that protrudes downward and a pump discharge path Pb that protrudes upward, and includes a pump portion K that is rotationally driven by a motor M therein. As the part K rotates, fuel is sucked into the pump part K from the pump suction path Pa, and fuel boosted by the pump part K is discharged from the pump discharge path Pb. The fuel pump P is disposed between the pump holder 2 and the lid member 1. By screwing the pump holder 2 to the lid member 1 with a screw, the fuel pump P is connected to the pump holder 2 and the lid member 1. 1 between the two. Reference numeral 3 denotes a fuel flow path drilled in the pump holder 2, the upstream in the flow direction is connected to the pump discharge path Pb, and the downstream is a fuel discharge pipe formed in the lid member 1 and opened to the outside. Connected to K. That is, the fuel discharged from the pump discharge path Pb is supplied to the outside of the fuel tank T via the fuel flow path 3 and the fuel discharge pipe 4. In the state where the fuel pump P is sandwiched between the lid member 1 and the pump holder 2, the opening Pa <b> 1 of the pump suction passage Pa is disposed on one side A from the longitudinal axis XX of the fuel pump P. One side A in FIG. 1 is on the right side of the longitudinal axis XX. A fuel filter F is connected to the pump suction path. The fuel filter F in this example was disposed along the longitudinal axis XX of the fuel pump P. Reference numeral 5 denotes a bottomed cup-shaped filter storage case having an opening at the bottom and a bottom at the top. The opening at the bottom is inserted into the outer periphery of the annular protrusion 1b of the lid member 1 and drilled into the bottom at the top. The insertion hole 5a is inserted into the outer periphery of the pump holder 2, and in this state, the filter storage case 5 is screwed and fixed to the lid member 1. A fuel supply hole 6 is formed in the side wall near the lower end of the filter storage case 5 so that the fuel supply hole 6 is on one side A from the longitudinal axis XX of the fuel pump P. An opening is arranged. According to the above, the pump suction path Pa of the fuel pump P and the fuel filter F are disposed in the substantially sealed annular chamber 7 formed by the pump holder 2 and the filter storage case 5 (in other words, the filter storage case 5 Inner) The opening Pa1 of the pump suction passage Pa of the fuel pump P and the fuel supply hole 6 of the filter storage case 5 are opened to the one side A from the longitudinal axis XX of the fuel pump P. R is a pressure control valve connected to the fuel flow path 3.

  The fuel supply unit FU is fixedly disposed on the fuel tank T as follows. A filter storage case 5 including a pressure control valve R, a fuel pump P, and a fuel filter F is inserted into the fuel tank T through an opening Tb in the bottom portion Ta of the fuel tank T, and the flange 1a of the lid member 1 is a fuel tank. In this state, the flange portion 1a of the lid member 1 is fixedly disposed on the bottom portion Ta with a bolt or the like. According to the above, the filter storage case 5 including the pressure control valve R, the fuel pump P, and the fuel filter F is disposed upright in the fuel tank T from the bottom portion Ta of the fuel tank T. The opening Pa1 and the fuel supply hole 6 of the filter storage case 5 are disposed on one side A from the longitudinal axis XX of the fuel pump P. When the fuel supply device F is fixed to the fuel tank T and viewed as the whole motorcycle, the opening Pa1 of the pump suction path Pa and the opening position of the fuel supply hole 6 in the fuel tank T are the positions of the fuel pump P. An opening is arranged on the rear C side with respect to the traveling direction B of the two-wheeled vehicle W with reference to the longitudinal axis XX. This is best shown in FIG. (Only the main part of the fuel supply device in FIG. 2 is shown.) As shown in FIG. 2, the fuel supply device in the two-wheeled vehicle W has a fuel discharge pipe 4 via a fuel pipe 8 and a fuel injection valve J. The fuel injection valve J is opened in the intake pipe G connected to the engine E.

  Accordingly, the fuel in the fuel tank T flows into the annular chamber 7 formed inside the filter storage case 5 from the fuel supply hole 6, and the foreign matter in the annular chamber 7 is removed by the fuel filter F. Then, clean fuel is sucked into the pump part K through the pump suction path Pa. The fuel boosted by the pump unit K is supplied to the fuel distribution pipe D through the fuel flow path 3, the fuel discharge pipe K, and the fuel pipe 8, and the fuel in the fuel distribution pipe D is a fuel injection valve. The injection amount is controlled by J, and the controlled fuel is supplied to the engine E through the intake pipe G.

  Here, the fluctuation state of the fuel liquid level YY in the fuel tank T during the climbing operation on the steep slope of the motorcycle is formed as the fuel liquid level YY in FIG. In FIG. 2, H indicates an inclined road surface, and the ZZ line indicates a horizontal line. The two-wheeled vehicle W including the fuel tank T is inclined along the road surface H, and the fuel liquid level YY is formed substantially parallel to the horizontal line ZZ. Here, according to the mounting structure of the fuel supply device according to the present invention, the opening Pa1 of the pump suction passage Pa into the filter storage case 5 and the opening of the fuel supply hole 6 of the filter storage case 5 are arranged along the longitudinal axis of the fuel pump P. Opening to one side A from line XX. In addition, since the opening Pa1 and the fuel supply hole 6 are arranged on the rear C side with respect to the traveling direction B of the two-wheeled vehicle with respect to the longitudinal axis XX of the fuel pump P, fuel injection is performed even during uphill driving. Sufficient fuel can be supplied to the engine E from the valve J. That is, as shown in FIG. 1 (the relationship between the fuel tank T and the fuel level YY in FIG. 2 is shown), the fuel tank T has a high-right slope near the bottom Ta and the rear C side is high. Although the fuel liquid level YY is formed, the fuel supply hole 6 and the opening Pa1 of the pump suction passage Pa are surely arranged at a position below the upper right inclined fuel liquid level YY in the gravity direction. it can. Therefore, even a small amount of fuel in the fuel tank T can be reliably supplied into the annular chamber 7 in the filter housing case 5, and the opening Pa 1 of the pump suction passage Pa of the fuel pump P is provided in the fuel in the annular chamber 7. Can be supplied toward the pump part K. In addition, the same effect as described above can be achieved during the rapid acceleration operation or the wheelie operation. When the motorcycle is traveling downhill or decelerating, the fuel level in the fuel tank T is formed as an inclined liquid level that rises to the left on the traveling direction B side. Since the load of the engine E is small and the fuel consumption is small, it is possible to cope with the fuel remaining in the filter storage case 5.

  Further, as shown in FIG. 1, if the position of the opening Pa1 of the pump suction path Pa of the fuel pump P is set to a position V lower than the opening position of the fuel supply hole 6 in the direction of gravity, the fuel supply possible time in the operation state Can be made longer. The above can be implemented by entering the opening Pa1 into the recess 1c of the lid member 1 and opening it. In other words, the fuel in the filter storage case 5 can be used more effectively.

  In addition, the thing of this invention is not limited to a two-wheeled vehicle, It can utilize also for a three-wheel buggy vehicle, a four-wheel buggy vehicle, etc.

The principal part longitudinal cross-sectional view which shows the state with which the fuel supply apparatus which becomes this invention was mounted | worn with the fuel tank. The principal part schematic which shows the state with which the fuel supply apparatus which becomes this invention with the two-wheeled vehicle was mounted | worn with the fuel tank.

Explanation of symbols

5 Filter storage case 6 Fuel supply hole A One side from the longitudinal axis XX of the fuel pump B Advancing direction of the motorcycle C Backward P Fuel pump Pa Pump intake path Pa1 Opening T Fuel tank

Claims (2)

  A bottomed cup-shaped filter storage case is erected upward from a lid member that closes the opening at the bottom of the fuel tank, and a fuel that includes a pump suction path and a pump discharge path in the filter storage case A fuel supply device in which a pump and a fuel filter connected to the pump suction passage are housed and disposed, and the filter housing case is inserted and disposed in the fuel tank through an opening of the fuel tank, and the opening is closed by a lid member , The opening Pa1 of the pump suction passage Pa of the fuel pump P into the filter storage case 5 and the fuel supply hole which is formed in the side wall of the filter storage case 5 and communicates the inside of the fuel tank T and the inside of the filter storage case 5. 6 to the one side A from the longitudinal axis XX of the fuel pump P, and the opening P of the pump suction passage Pa of the fuel pump. 1 and the fuel supply hole 6 are arranged on the rear C side with respect to the traveling direction B of the two-wheeled vehicle with respect to the longitudinal axis XX of the fuel pump P as a reference. . 2. The fuel supply device mounting structure for a motorcycle according to claim 1, wherein the position of the opening Pa1 of the pump suction passage Pa of the fuel pump is arranged at a position V below the fuel supply hole 6 in the direction of gravity.

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