JP6207488B2 - Fuel supply device and small vehicle equipped with fuel supply device - Google Patents

Description

  The present invention relates to a fuel supply device and a small vehicle equipped with the fuel supply device.

  Conventionally, a discharge path for pumping fuel from a fuel tank disposed under a seating seat of a motorcycle or the like to a fuel injection valve, and a return path for returning surplus fuel flowing out from the pressure adjustment valve on the fuel injection valve side to the fuel tank There is a fuel supply device (see Patent Document 1).

  In such a fuel supply device provided in a small vehicle, in order to be able to be adopted for various internal combustion engines, it is particularly required to reduce the size around the fuel injection valve, and is disposed in the vicinity of the fuel injection valve. There is a technique for integrating a pressure regulating valve into a fuel supply device as a pump module including a fuel pump.

  The fuel supply apparatus is provided with a discharge pipe connected to the discharge path and a return pipe connected to the return path. The discharge pipe and the return pipe are connected to the fuel tank of the fuel supply apparatus. Since the pressure regulating valve is arranged in the middle of the return pipe, the discharge pipe and the return path are suppressed in order to suppress interference between the discharge path and the return path. It was necessary to lay out them so that they were spaced apart from the tubes.

  However, if the discharge pipe and the return pipe are arranged apart from each other, the width of the fuel supply device is widened, so the arrangement and mounting position of the fuel supply device in the fuel tank may be limited, and the fuel supply device can be downsized. Is required.

Furthermore, when the pressure regulating valve is provided in the middle of the return pipe provided in the fuel supply device, another problem is that the piping path in the fuel supply device is lengthened and the height of the fuel supply device is increased. There is a problem to do. In particular, in a small vehicle in which a fuel tank is disposed below the seating seat, it is necessary to increase the height of the fuel tank by increasing the fuel supply device. As a result, the seating position of the seating seat increases, There was a risk of affecting the footing.
(See Patent Document 1).

Japanese Patent No. 4176456

  The present application has been made in view of such circumstances, and its purpose is to make the layout of the fuel supply device free by reducing the size of the fuel supply device in a small vehicle in which a fuel tank is disposed below the seat. Further, the height of the seating seat is suppressed by suppressing the height of the fuel supply device, and the fuel supply device can be downsized without affecting the seating property of the vehicle. Is to provide.

In order to achieve the above object, the present invention provides:
A fuel pump is attached to the outer wall of the fuel tank so as to be accommodated in the fuel tank from the outside of the fuel tank,
A discharge pipe that discharges fuel pumped from the fuel pump to the discharge external pipe by being connected to a discharge external pipe provided outside the fuel tank;
By connecting to a return external pipe provided outside the fuel tank, a return pipe is provided for returning surplus fuel at the supply destination to the inside of the fuel tank,
In a fuel supply apparatus for supplying fuel from the fuel tank to a supply destination,
The fuel supply device is attached to a fuel tank, is located outside the fuel tank and is attached to an outer wall of the fuel tank, a raised portion raised from the flange portion, and an inside of the raised portion With a pressure regulating valve to be accommodated,
The return pipe is a fuel supply device for a small vehicle, wherein the return pipe is formed to extend from a portion of the raised portion that overlaps the pressure regulating valve in a plan view.

  According to the present invention, when the pressure adjustment valve provided on the return side in the fuel supply apparatus including the discharge pipe and the return pipe is integrated with the fuel supply apparatus, the pressure adjustment valve is connected to the fuel tank of the fuel supply apparatus. Since the return pipe is formed so as to extend from above the raised portion by being accommodated in the raised portion raised from the flange surface located outside, the return pipe and the pressure regulating valve are overlapped in plan view. Compared with the case where these are arranged apart from each other, expansion of the fuel supply device in the outer peripheral direction can be suppressed, the enlargement of the fuel supply device can be suppressed, and the layout of the fuel supply device can be liberated. Can be promoted.

  The discharge pipe may be extended from a position below the return pipe in the raised portion.

  According to such a configuration, since the discharge pipe is extended from a position below the return pipe in the raised portion, when the discharge pipe and the return pipe are at the same height, interference with the other pipe may occur. Influenced, the angular range of the extension direction of each pipe is limited, but the extension direction of each of the discharge pipe and the return pipe is different because the extension height of each of the discharge pipe and the return pipe is different. Can be set to an arbitrary angle in the entire circumference range, and the degree of freedom of arrangement of the piping is improved.

  The pressure regulating valve may be cylindrical, and the discharge pipe may extend from a height range of the pressure regulating valve in the raised portion.

  According to such a configuration, since the discharge pipe is extended from the range of the height of the pressure regulating valve having a cylindrical shape, the empty space around the raised portion that has been raised by accommodating the pressure regulating valve is used. Thus, the discharge pipe can be arranged at a low position, and space saving can be achieved, and the height of the seating seat is prevented from being increased by suppressing the height of the entire fuel supply device, The pressure regulating valve can be arranged in the fuel supply device without affecting the footing performance of the vehicle.

  The discharge pipe may be extended in a direction orthogonal to the return pipe in plan view.

  According to such a configuration, the fuel pipe connected to the discharge pipe and the return pipe, or the pipe removal work at the time of maintenance while preventing the mutual connection by separating the connection parts of the fuel pipe connected to the pipe. In this case, these discharge pipes and return pipes are straight and extend in opposite directions, respectively, and can be performed from the same side direction, and the workability is improved as compared with the case where the pipe insertion / extraction directions are opposite to each other.

  A connecting portion with the electric wire connector of the fuel supply device may be disposed below the return pipe and on an extension line in the extending direction of the discharge pipe.

  According to such a configuration, since the connection portion with the electric wire connector of the fuel supply device is arranged on the extended line in the extending direction of the discharge pipe below the return pipe, the electric wire connector in the connected state is arranged. While suppressing the height and reducing the size, interference with the piping with the discharge pipe and the return pipe or with the electric wire connector can be prevented.

  You may arrange | position so that a part of housing part of a fuel pump main body may overlap with the extended line of the discharge | release direction from which the fuel returned from the said return pipe is discharge | released from the said pressure regulation valve.

  According to such a configuration, since a part of the housing part of the fuel pump body overlaps the extended line in the discharge direction in which the return fuel is discharged from the pressure adjustment valve, the return fuel discharged from the pressure adjustment valve is Further, it is possible to prevent the fuel pump from sucking in the fuel mixed with air by preventing direct contact with the fuel accumulated in the fuel tank and suppressing the foaming of the fuel.

The fuel tank is disposed below a seating seat on which an occupant is seated, and has a recess whose upper surface is partially lowered,
In this recess, an opening for inserting and fixing the fuel pump part of the fuel supply device is provided,
You may arrange | position so that the said return pipe may be located below the upper surface located in a high position by the side view of the said fuel tank.

  According to such a configuration, the fuel supply device is inserted and fixed from the opening of the recessed portion of the fuel tank disposed below the seating seat, and the return pipe is disposed at a position lower than the upper surface of the tank at the high position in side view. Therefore, both the discharge pipe and the return pipe are prevented from jumping out from the upper surface of the fuel tank in a side view of the fuel tank, and the interference between the seating seat located above and the discharge pipe and the return pipe is prevented. The return pipe can be protected using a tank.

The present invention includes an internal combustion engine,
A seat,
A fuel tank located below the seat;
A fuel supply device which is attached to the outer wall of the fuel tank so as to accommodate a fuel pump from the outside of the fuel tank and supplies fuel to a supply destination;
A discharge pipe for discharging the fuel pumped from the fuel pump to the discharge external pipe by being connected to a discharge external pipe provided in the fuel supply device and provided outside the fuel tank;
In the small vehicle having a return pipe that is provided in the fuel supply device and is connected to a return external pipe provided outside the fuel tank to return surplus fuel at the supply destination to the inside of the fuel tank.
The fuel tank is formed with a recess that is partially lowered toward the side edge of the upper surface, and the recess is provided with an opening that is inserted and fixed around the pump of the fuel supply device. Both are provided with a vertical wall portion in which the upper surface located at a high position around the concave portion is inclined and rises toward the side edge,
The fuel supply device is accommodated in a flange portion of the fuel supply device positioned outside the fuel tank in a state of being attached to the fuel tank, a raised portion protruding from the flange portion, and an inside of the raised portion. And a pressure regulating valve
The discharge pipe and the return pipe are provided to be shifted up and down from the raised portion,
A pipe arranged above the discharge pipe and the return pipe is arranged toward the vertical wall portion standing up around the concave portion of the fuel tank,
Of the discharge pipe and the return pipe, a pipe arranged below is arranged toward the side edge of the fuel tank.

  The present invention forms a recessed portion that is partially lowered toward the side edge of the fuel tank below the seating seat, and connects the return pipe and the discharge pipe of the fuel supply device provided in this recessed portion to the vertical wall side around the recessed portion. Since the upper surface of the fuel tank around the recess is inclined toward the side edge, the discharge pipe and the return pipe do not jump out of the upper surface of the fuel tank. Therefore, it is possible to suppress the bulge to the seat side located above the fuel tank and prevent the seat height from increasing, thereby suppressing the height of the seating seat and The fuel supply device can be reduced in size without affecting the above.

  According to the present invention, it is possible to suppress the expansion of the fuel supply device in the outer peripheral direction and suppress the increase in size, promote the liberalization of the layout of the fuel supply device, and suppress the height of the fuel supply device. It is possible to prevent the height of the seating seat from being increased, and to reduce the size of the fuel supply device without affecting the seating performance of the vehicle.

1 is a left side view of a motorcycle including a fuel supply device according to an embodiment of the present invention. It is a principal part enlarged view of FIG. It is a top view of a storage case. It is a longitudinal cross-sectional view in the vehicle width direction center of a seating seat. It is a perspective view of a fuel tank simple substance. It is a perspective view of a fuel supply unit alone. It is a top view of a fuel supply device single-piece | unit. It is a VIII arrow line view in Drawing 7 of a fuel supply unit single-piece. It is a top view of the state in which the fuel supply apparatus was integrated in the fuel tank. FIG. 10 is a cross-sectional view taken along the line XX in FIG. 9. FIG. 10 is a cross-sectional view taken along arrow XI-XI in FIG. 9. It is a longitudinal cross-sectional view around a pressure regulating valve. It is a longitudinal cross-sectional view around a fuel supply device. It is a left view of the state in which the fuel supply apparatus was attached to the fuel tank.

  Hereinafter, an embodiment according to the present invention will be described with reference to FIGS. In the present specification, the forward and backward directions of the motorcycle 1 are set to the front, and the front, rear, left and right are defined based on the posture facing the front.

  FIG. 1 is an overall side view of a motorcycle 1 equipped with a fuel supply device 40 according to the present embodiment, and FIG. 2 shows an enlarged view thereof.

  The body frame 2 of the motorcycle 1 is as follows. A main frame 2 b fixed to the head pipe 2 a extends obliquely downward and rearward on the vehicle body center line of the motorcycle 1. A pair of left and right side frames 2c that extend rearward while extending in the width direction are attached to the left and right of the main frame 2b, and the rear ends are formed to extend upward. At the rear ends of the left and right side frames, there is attached a rear frame 2d in which a pair of left and right members extending rearward in a substantially horizontal direction and a connecting cross member for connecting the left and right members are integrally formed. Yes.

  In such a vehicle body frame 2, a front fork 3 is pivotally supported on the head pipe 2a, a handle 4 extending left and right is attached to the upper end of the front fork 3, and a front wheel 5 is pivotally supported on the lower end. A rear fork 6 whose front end is pivotally supported by a pivot plate (not shown) provided at the lower portion of the main frame 2b extends rearward, and a rear wheel 7 is pivotally supported at the rear end thereof. The rear fork 6 and the rear frame 2d A rear cushion 8 is interposed between the front portion and the front portion.

  As shown in FIG. 2, through the hanger plate 12 fixed to each of the pair of side frames 2c, located substantially in the center in the front-rear direction of the motorcycle 1, below the main frame 2b of the body frame 2. An internal combustion engine E is attached so that the cylinder axis is slightly raised forward. The internal combustion engine E constitutes a power unit P together with the transmission M, and the rotational driving force output from the internal combustion engine E is transmitted to the rear wheel 7 via the transmission M and a chain (not shown). ing.

  In the internal combustion engine E, a cylinder block 16, a cylinder head 17, and a head cover 18 are sequentially stacked and fastened together toward the front of the crankcase 15. A crankshaft 19 is supported between the crankcase 15 and the cylinder block 16 in the left-right direction.

  An air cleaner 20 that takes in air to the internal combustion engine E and removes impurities is attached below the main frame 2b in front and above the internal combustion engine E. On the downstream side of the air cleaner 20, a throttle body 21 for adjusting the amount of intake air, a fuel injection valve 23 are inserted, and an inlet pipe 22 in which the sprayed fuel and the intake air from the fuel injection valve 23 are mixed, a cylinder head Inlet ports (not shown) 17 are sequentially connected, and an air-fuel mixture in which fuel and outside air are mixed is sent to a combustion chamber (not shown) formed in the cylinder head 17.

  As shown in FIG. 2, a storage box 9 for storing articles such as a helmet is provided obliquely above and behind the internal combustion engine E, and to the fuel injection valve 23 behind the storage box 9. A fuel supply device 40 for supplying fuel is incorporated, and a fuel tank 30 for storing fuel is disposed.

  FIG. 3 is a plan view of the storage box 9 alone, and FIG. 13 is a longitudinal sectional view of a part of the storage box 9 and the vicinity of the fuel tank 30. The storage box 9 includes a box portion 9a formed in a box shape having an upper opening so that a helmet can be stored, and a recessed portion of a fuel tank 30 that is extended to the rear and to which a fuel supply device 40 described later is attached. A cover portion 9b for covering 33 is formed integrally. The storage box 9 is attached to the rear part of the main frame 2b and the horizontal part of the pair of side frames 2c so as to be positioned above the main frame 2b and the side frames 2c. A fuel tank 30 is supported by the rear frame 2d, located behind the storage box 9.

  As shown in FIGS. 1 and 2, a seating sheet 10 for a passenger to sit on, for example, a tandem seating sheet 10 is disposed so as to cover the upper surfaces of the storage box 9 and the fuel tank 30. FIG. 4 shows a longitudinal sectional view cut in the longitudinal direction at the center of the seating seat 10 in the width direction. The seating sheet 10 has a cushion portion 10b formed of urethane or the like placed on a bottom plate 10a formed in a concave shape recessed upward, and the outer surface of the cushion portion 10b and the bottom plate 10a are made of synthetic leather or the like cover 10c. The tandem seat is configured so that the driver is seated at the front and the passenger can be seated at the rear. As shown in FIGS. 4 and 13, the front side of the bottom plate 10 a is a lid portion 10 d that serves as a lid for the storage box 9, and the rear side is attached to the fuel tank 30 and the fuel tank 30. A recessed portion 10e that is further deeply recessed is formed so as to avoid the fuel supply device 40 and the cover portion 9b of the storage box 9 covering these.

  The front part of the lower surface of the seating sheet 10 and the front part of the upper surface of the storage box 9 form a connecting part 11 connected in a hinge-like manner, and the seating sheet 10 is lifted by lifting the rear part of the seating sheet 10. When 10 is swung upward, the upper surface of the storage box 9 is opened so that articles can be stored in the storage box 9, and the fuel screwed into the fuel inlet 37 formed on the upper surface 34 of the fuel tank 30. By opening the cap 38, fuel can be injected into the fuel tank 30. Further, when the rear portion of the seating seat 10 is pushed down and swung downward about the connecting portion 11, the upper surface of the storage box 9 and the fuel tank 30 is covered with the seating seat 10, and the storage box 9 is closed by the lid portion 10d. It becomes.

  As shown in FIG. 5, the fuel tank 30 is composed of an upper half 31 and a lower half 32 formed by pressing steel plates into a bowl shape, and each of the upper half 31 and the lower half 32 is It is formed in bottom plate portions 31a and 32a, which are bowl-shaped bottoms, side wall portions 31b and 32b rising from the peripheral edges of the bottom plate portions 31a and 32a, and flange portions 31c and 32c that border the peripheral edges of the side wall portions 31b and 32b. . The flange portion 31c of the upper half 31 and the flange portion 32c of the lower half 32 are joined together, and the upper half 31 and the lower half 32 are integrated by welding or the like, and the upper half 31 and the lower half 32 are fuel. It becomes the outer wall 30a of the tank 30, and the inside of the fuel tank 30 becomes the fuel storage part 30b which stores fuel.

  A portion of the outer wall 30a of the fuel tank 30 that is closer to the left front edge is formed in a recessed portion 33 that is partially lowered, and the upper surface 34 of the fuel tank 30 is a recessed upper surface portion 34a that serves as the bottom of the recessed portion 33. In addition to the recess upper surface portion 34a, the upper surface portion 34b is higher than the recess upper surface portion 34a. A vertical wall portion 35 is formed so as to stand up so as to surround the right edge, the rear edge, and the left rear edge of the concave upper surface portion 34a, and the vertical wall portion 35 extends from the lower concave upper surface portion 34a to the higher upper surface portion. Stands up to 34b.

A fuel supply device insertion port 36 into which a part of the fuel supply device 40 is inserted is formed in the recess upper surface portion 34 a of the fuel tank 30. Around the fuel supply device insertion port 36 , a pair of fixing brackets 39 for fixing the fuel supply device 40 is attached to the upper surface portion 34a of the recess. The fixing bracket 39 includes a plate-like portion 39a formed so as to surround the fuel supply device insertion port 36, and a screw portion 39b into which a nut 59 is screwed upward at a right angle from the plate-like portion 39a. ing.

  Further, a fuel inlet 37 for injecting fuel into the fuel tank 30 is formed in the upper upper surface portion 34b. The fuel tank 37 is located below the fuel inlet 37 as shown in FIG. 30 is provided with a cylindrical filter 30c for filtering the fuel injected into the fuel tank 30. A fuel cap 38 is screwed into the fuel inlet 37 so that the fuel tank 30 is sealed.

  As shown in FIG. 13, a fuel supply device 40 is accommodated in the fuel tank 30 by inserting a part of the fuel supply device 40 into the fuel tank 30 from the fuel supply device insertion port 36 opened in the upper surface portion 34 a of the recess. In this manner, the fuel tank 30 can be attached to the concave upper surface portion 34a of the outer wall 30a.

  The fuel supply device 40 will be described with reference to FIGS. FIG. 6 is a perspective view showing the fuel supply device 40 alone. The fuel supply device 40 includes a fuel pump unit 41 that supplies the fuel in the fuel tank 30 by pressure to the internal combustion engine E, and a fuel level gauge unit 54 that measures the remaining amount of fuel in the fuel tank 30. The fuel pump unit 41 and the fuel level gauge unit 54 are connected by a connection unit 53 to form a unit.

  As shown in FIG. 6, the fuel level gauge portion 54 has a fuel level gauge main body 55, a rotary shaft (not shown) that is rotatably supported by the fuel level gauge main body 55, and a base end fixed to the rotary shaft. A float arm 56 and a float 57 fixed to the tip of the float arm 56 are provided. The float 57 is raised or lowered according to the level of fuel in the fuel tank 30, and the float arm 56 is moved up and down as the float 57 moves up and down. Is swung to rotate the rotation shaft, and a rotation amount of the rotation shaft is electrically detected by a sensor (not shown) so that the occupant can display the remaining amount of fuel in the fuel tank 30. .

  The fuel pump portion 41 includes a substantially cylindrical main body portion 42 in which the fuel pump 42b is housed, and a flange portion 43 formed in a disk shape on the upper portion of the main body portion 42 and attached to the outer wall 30a of the fuel tank 30. , And a raised portion 44 integrally formed so as to rise from the upper surface of the flange portion 43. As shown in FIG. 11, in a state where the fuel supply device 40 is attached to the fuel tank 30, the flange portion 43 and the raised portion 44 are located outside the fuel tank 30.

  As shown in FIG. 10, the main body portion 42 includes a housing portion 42 a serving as a shell, a fuel pump 42 b is accommodated inside the housing portion 42 a, and a lower portion of the housing portion 42 a is an inflow communicating with the strainer 48. A passage 42c is formed. When the fuel pump 42b is in operation, the fuel in the fuel tank 30 is sent from the strainer 48 to the fuel pump 42b through the inflow passage 42c.

  A discharge passage 42d into which fuel discharged from the fuel pump 42b flows is formed above the fuel pump 42b in the housing portion 42a. A check valve chamber 42e communicating with the discharge passage 72d is formed above the discharge passage 42d, and a check valve 49 for preventing the backflow of fuel discharged from the fuel pump 42b is accommodated in the check valve chamber 42e. ing. Further, a return passage 42f is formed in the housing part 42a for returning surplus fuel sent to the fuel injection valve 23 as a fuel supply destination into the fuel tank 30, and the return passage 42f is formed in the fuel tank 30. Communicated with.

  As shown in FIGS. 9 and 11, a flange portion 43 is integrally formed on the upper portion of the main body portion 42. The flange portion 43 is formed in a disc shape having a diameter larger than the outer diameter of the main body portion 42 and larger than the inner diameter of the fuel supply device insertion port 36 of the fuel tank 30.

The fuel supply device 40 is attached to the fuel tank 30 by fixing the flange portion 43 to the outer wall 30a of the fuel tank 30 as follows. First, the main body portion 42 of the fuel gauge unit 54 and the fuel pump unit 41 of the fuel supply device 40, housed is inserted into the fuel tank from the fuel supply device insertion port 36, the fuel supply system under surface of the flange portion 43 It contacts the outer wall 30a of the fuel tank 30 around the insertion port 36. The threaded portion 39b of the fixing bracket 39 fixed around the fuel supply device insertion port 36 is inserted into the insertion hole 58a of the pair of holding fittings 58 for holding the flange portion 43, and the flange portion 43 is moved upward by the holding fitting 58. When the nut 59 is screwed onto the screw portion 39b of the fixing bracket 39, the flange portion 43 is fixed, and the fuel supply device 40 is configured so that the fuel pump 42b is accommodated inside the fuel tank 30. It is attached to 30 outer walls 30a.

  As shown in FIG. 6, a raised portion 44 that is raised from the upper surface of the flange portion 43 is integrally formed above the flange portion 43. The raised portion 44 includes a stepped portion 44a in which a rectangular parallelepiped is formed in a stepped shape, a cylindrical high-order cylindrical portion 44d further raised from a high surface portion 44b which is a higher surface of the upper surface of the stepped portion 44a, and a stepped portion It is formed so as to include a cylindrical lower columnar portion 44e raised from a lower surface portion 44c which is a lower surface of the upper surface of 44a. The height of the upper surface of the lower cylindrical portion 44e is substantially equal to the height of the high surface portion 44b.

  The raised portion 44 has a discharge pipe 45 for discharging the fuel pumped from the fuel pump 41b to the outside of the fuel supply device 40, and surplus fuel from the fuel injection valve 23 to which the fuel is supplied. The return pipe 46 for returning to the inside, and the electric wire 51 from the fuel pump part 41 and the fuel level gauge part 54 are connected, and the electric wire connector connecting part 47 into which the electric wire connector 64 of the electric wire 65 connected to the ECU (not shown) is inserted. Is provided.

The return pipe 46 is formed so as to extend perpendicularly to the longitudinal direction of the stepped portion 4 4 a from the higher cylindrical portion 44 d of the raised portion 44. Discharge pipe 45 is formed so as to extend toward the longitudinal direction of the step portion 4 4 a from lower cylindrical portion 44e of the raised portion 44. The wire connector connecting portion 47 is provided on the stepped portion 4 4 a so as to be located on the opposite side of the discharge tube 45 on the extension line in the extension direction of the discharge tube 45.

  As shown in FIG. 7, the discharge pipe 45 and the return pipe 46 are extended in a direction substantially perpendicular to the plan view, and workability of attaching and detaching pipes connected to the discharge pipe 45 and the return pipe 46 is improved. Is good. Further, since the wire connector connecting portion 47 is disposed on the extension line in the extending direction of the discharge pipe 45, interference between the pipe connected to the discharge pipe 45 and the return pipe 46 and the electric wire 65 extending from the wire connector 64 is prevented. Be able to.

  Further, as shown in FIG. 8, the discharge pipe 45 extends from a position below the return pipe 46. Compared to the case where the discharge pipe 45 and the return pipe 46 have the same height, the other pipe and Each extending direction can be set to an arbitrary angle in the entire circumferential range without being affected by the interference, and the degree of freedom in arranging the pipes is high. Further, the wire connector connecting portion 47 is provided at substantially the same height as the discharge pipe 45, and the height of the wire connector 64 in the state connected to the wire connector connecting portion 47 is suppressed to reduce the size of the fuel supply device 40. Thus, interference with the piping with the discharge pipe 45 and the return pipe 46 and with the electric wire connector 64 can be prevented.

  As shown in FIGS. 10 and 11, a pressure regulating valve housing hole 44 g is formed inside the high columnar portion 43 c and the stepped portion 43 a of the raised portion 44. A cylindrical pressure regulating valve 50 for regulating the pressure of the fuel to be sent to the fuel injection valve 23 is accommodated in the pressure regulating valve accommodation hole 44g, and the pressure regulating valve 50 is formed in the housing portion 42a from below so as not to drop off. It is fixed by the wall.

  As shown in FIG. 12, the pressure regulating valve 50 is provided with an inlet 50 a that returns to the pressure regulating valve 50 and into which fuel flows and an outlet 50 b that flows into the main body 42. The pressure regulating valve 50 includes a cylindrical valve case 50c in which the outlet 50b is provided in the lower part, a seat valve 50d in which the upper part of the valve case 50c is closed to form the inlet 50a, and a ball serving as a valve body. It comprises a valve body 50e, a spring 50f for urging the ball valve body 50e in a direction to close the inlet 50a of the seat valve 50d, and a spring guide 50g whose upper surface is in contact with the ball valve body 50e to guide the spring 50f. Yes. The inlet 50a of the pressure regulating valve 50 communicates with the return pipe 46, and the outlet 50b communicates with a return passage 42h provided in the housing portion 42a of the main body 42.

  In the stepped portion 44a and the lower cylindrical portion 44e of the raised portion 44, as shown in FIG. 10, the discharge passage is located above the check valve 49 and communicates with the discharge side of the check valve 49 and the discharge pipe 45. 44f is formed, and the fuel pumped from the fuel pump 42b passes through the discharge passage 42d, the check valve 49, and the discharge passage 44f in this order, and is sent to the discharge pipe 45.

  The pressure regulating valve 50 is accommodated in the high columnar portion 44d of the raised portion 44 raised from the flange portion 43 located outside the fuel tank 30, and the return pipe 46 overlaps from above the high columnar portion 44d. Accordingly, as shown in FIG. 7, the return pipe 46 and the pressure regulating valve 50 are arranged so as to overlap in a plan view. Since it is arranged in this way, it is possible to suppress the expansion of the fuel supply device 40 in the outer peripheral direction and to prevent the fuel supply device 40 from being enlarged compared to the case where these are arranged apart from each other, and the layout of the fuel supply device 40 can be freely set. Can be promoted.

  Further, as shown in FIG. 10, the discharge pipe 45 extends from the range of the height of the pressure regulating valve 50 accommodated in the raised portion 44. Since the discharge pipe 45 is extended from within such a range, the discharge pipe 45 can be arranged at a low position by utilizing the empty space around the raised portion 44 that has been raised by accommodating the pressure regulating valve 50. Space is achieved and the height of the fuel supply device 40 is suppressed.

  As shown in FIG. 7, the pressure regulating valve 50 is accommodated in a substantially central position between the flange portion 43 and the main body portion 42 in a plan view, and is returned from the return pipe 46 as shown in FIG. A part of the housing part 42a of the main body part 42 of the fuel pump part 41 is arranged on the extended line in the discharge direction from which the fuel is discharged from the pressure regulating valve 50. This arrangement prevents the return fuel from directly hitting the fuel stored in the fuel tank 30 and suppresses the foaming of the fuel, thereby suppressing the fuel pump 41b from sucking the fuel mixed with air. can do.

As shown in FIG. 13, the fuel tank 30 is disposed below the seating seat 10 on which an occupant sits, and has a recess 33 whose upper surface 34 is partially lowered. A fuel supply device insertion port 36 for inserting and fixing the fuel pump portion 41 and the fuel level gauge portion 54 of the device 40 is provided, and the fuel supply device 40 is fixed to the fuel tank 30. Further, as shown in FIG. 14, the return pipe 46 is disposed so as to be positioned below the upper surface portion 34 b positioned at a higher position in the upper surface 34 of the fuel tank 30 in a side view of the fuel tank 30. . Since both the discharge pipe 45 and the return pipe 46 are disposed in this manner, the seating sheet 10 and the discharge pipe positioned above are suppressed from jumping out from the upper surface 34 of the fuel tank 30 in a side view of the fuel tank. Thus, the fuel tank 30 can be used to protect the discharge pipe 45 and the return pipe 46.

  2 and 9, the discharge pipe 45 is connected to a fuel supply pipe 60 as a discharge external pipe provided outside the fuel tank 30, and the fuel discharged from the fuel supply apparatus 40 is fuel. It is sent to the injection valve 23.

  As shown in FIG. 9, the fuel supply pipe 60 includes an upstream fuel supply pipe 60a and a downstream fuel supply pipe 60b. Between the upstream fuel supply pipe 60a and the downstream fuel supply pipe 60b, A fuel filter 62 and a branch pipe 63 are sequentially connected. The fuel filter 62 is used in an internal combustion engine E that uses a mixed fuel of alcohol and gasoline as a fuel, and filters impurities in the fuel that could not be removed by the strainer 48.

  An upstream end 63a of the branch pipe 63 is connected to the downstream side of the fuel filter 62, and an end 63b on the downstream side of the branch pipe 63 is connected to the downstream fuel supply pipe 60b. The other end 63 c on the downstream side of 63 is connected to the upstream side of the fuel return pipe 61, and the downstream side of the fuel return pipe 61 is connected to the return pipe 46.

  Since the fuel supply device 40, the fuel supply pipe 60, and the fuel return pipe 61 are configured as described above, the fuel stored in the fuel tank 30 is sent to the fuel injection valve 23 as described below. Further, surplus fuel among the fuel sent to the fuel injection valve 23 is returned to the fuel tank 30.

  When the fuel pump 42b is operated, as shown in FIG. 10, the fuel in the fuel tank 30 passes through the strainer 48 and flows into the lower part of the main body portion 42 of the fuel pump portion 41 of the fuel supply device 40. 42c is sucked into the fuel pump 42b. The fuel is pressurized by the fuel pump 42b and discharged to the discharge passage 42d in the main body 42. When the pressure exceeds the predetermined pressure, the check valve 49 is opened, and the fuel flows out to the discharge passage 44f in the raised portion 44. It flows to the discharge pipe 45. The fuel passes through the upstream side fuel supply pipe 60a from the discharge pipe 45, flows into the fuel filter 62, and is filtered. The filtered fuel passes through the branch pipe 63 and the downstream fuel supply pipe 60b and is sent to the fuel injection valve 23.

  Since the fuel injection valve 23 performs and stops fuel injection according to the combustion state of the internal combustion engine E, when the fuel injection of the fuel injection valve 23 is stopped, the fuel injection valve 23 and the fuel supply pipe 60 As the fuel pressure increases, the fuel pressure in the fuel return pipe 61 and return pipe 46 connected to the fuel supply pipe 60 via the branch pipe 63 increases.

  When the pressure in the return pipe 46 becomes equal to or higher than a predetermined pressure, the ball valve body 50e of the pressure regulating valve 50 is pushed down and the pressure regulating valve 50 is opened, as shown in FIG. The fuel is returned into the fuel tank 30 through the return passage 44h of the raised portion 44 and the return passage 42f of the main body portion 42 shown in FIG. 10, and a pressure of a predetermined pressure or more is applied to the fuel injection valve 23. Absent.

  Since the fuel supply device 40 and the motorcycle 1 equipped with the fuel supply device 40 according to the present embodiment are configured as described above, the following effects can be obtained.

  The fuel supply device 40 of this embodiment is attached to the outer wall 30a of the fuel tank 30 so as to accommodate the fuel pump 42b from the outside of the fuel tank 30 and is provided on the outside of the fuel tank 30. By being connected to 60, the fuel pumped from the fuel pump 42b is connected to a discharge pipe 45 for discharging the fuel supply pipe 60 and a fuel return pipe 61 provided outside the fuel tank 30. A return pipe 46 for returning surplus fuel from the fuel injection valve 23 at the supply destination to the inside of the fuel tank 30 is provided, and fuel is supplied from the fuel tank 30 to the supply destination. Further, the fuel supply device 40 includes a flange portion 43 that is located outside the fuel tank 30 and is attached to the outer wall 30a of the fuel tank 30 in a state of being attached to the fuel tank 30, and a raised portion 44 that is raised from the flange portion 43. The pressure adjusting valve 50 accommodated inside the raised portion 44 is provided, and the return pipe 46 is formed to extend from a portion of the raised portion 44 overlapping the pressure adjusting valve 50 in a plan view. Thus, in the fuel supply device 40 having the discharge pipe 45 and the return pipe 46, when the return-side pressure adjustment valve 50 is integrated with the fuel supply device 40, the pressure adjustment valve 50 is positioned outside the fuel tank 30. Since it is formed so as to extend from above the raised portion 44 so as to overlap with the raised portion 44 that protrudes from the flange portion 43, the return pipe 46 and the pressure regulating valve 50 are overlapped in plan view. Compared to the case where they are arranged apart from each other, expansion of the fuel supply device 40 in the outer peripheral direction can be suppressed, the enlargement of the fuel supply device 40 can be suppressed, and the layout of the fuel supply device 40 can be freely set. Can be promoted.

  Furthermore, since the discharge pipe 45 is extended from a position lower than the return pipe 46 in the raised portion 44, when these are set to the same height, they are influenced by interference with the other pipe, and each pipe is However, in the case of the present embodiment, the extending direction of each of the discharge pipe 45 and the return pipe 46 can be set to an arbitrary angle in the entire circumference range, The degree of freedom of piping arrangement is improved.

  In the fuel supply device 40 of the present embodiment, the pressure regulating valve 50 has a cylindrical shape, and the discharge pipe 45 extends from the height range of the pressure regulating valve 50 in the raised portion 44, so that the pressure regulating valve 50 is accommodated. By doing so, the discharge pipe 45 can be arranged at a low position using the empty space around the raised portion 44 that has been raised, and space saving can be achieved. Furthermore, the height of the seating seat 10 is prevented by suppressing the height of the fuel supply device 40 as a whole, and the pressure adjustment valve 50 is placed in the fuel supply device 40 without affecting the seating performance of the vehicle. Can be arranged.

  Since the discharge pipe 45 of the present embodiment extends in a direction perpendicular to the return pipe 46 in plan view, the upstream fuel supply pipe 60a and the fuel return pipe 61 connected to the discharge pipe 45 and the return pipe 46, respectively. Alternatively, in the work of removing the pipes during maintenance, separating the connection part between the discharge pipe 45 and the upstream fuel supply pipe 60a and the connection part between the return pipe 46 and the fuel return pipe 61 to prevent mutual interference. Compared to the case where the discharge pipe 45 and the return pipe 46 are extended in opposite directions on a straight line and the insertion / removal directions of the pipes face each other, work can be performed from the same side, and workability is improved.

  In the fuel supply device 40 of the present embodiment, the electric wire connector connecting portion 47 connected to the electric wire connector 64 is disposed below the return pipe 46 and on the extension line in the extending direction of the discharge pipe 45. In this state, the height of the electric wire connector 64 can be suppressed to reduce the size of the fuel supply device 40, and the piping with the discharge pipe 45 and the return pipe 46 or interference with the electric wire connector 64 can be prevented.

  In the present embodiment, the fuel returned from the return pipe 46 is arranged so that a part of the housing part 42a of the main body part 42 of the fuel pump part 41 overlaps with an extension line in the discharge direction from which the fuel is discharged from the pressure regulating valve 50. Therefore, the return fuel released from the pressure regulating valve 50 is prevented from directly hitting the fuel accumulated in the fuel tank 30 to suppress the foaming of the fuel, and the fuel pump 42b removes the fuel mixed with air. Inhalation can be suppressed.

  In the present embodiment, the fuel tank 30 is disposed below the seating seat 10 on which an occupant sits, and the upper surface 34 of the fuel tank 30 has a recess 33 that is partially lowered. A fuel supply device insertion port 36 for inserting and fixing the fuel pump portion 41 and the fuel level gauge portion 54 is provided, and the return pipe 46 is higher than the upper upper surface portion 34b positioned at the higher position of the fuel tank 30 in a side view of the fuel tank 30. Since both the discharge pipe 45 and the return pipe 46 are arranged so as to be positioned below, the seating seat positioned above is suppressed by preventing the discharge pipe 45 and the return pipe 46 from jumping out from the upper surface 34 of the fuel tank 30 in a side view. 10 can be prevented from interfering with the discharge pipe 45 and the return pipe 46, and the discharge pipe 45 and the return pipe 46 can be protected by using the fuel tank 30.

  In the motorcycle 1 of the present embodiment, the internal combustion engine E and the seating seat 10 are provided, the fuel tank 30 is provided below the seating seat 10, and the fuel supply device 40 that supplies fuel to the supply destination is provided outside the fuel tank 30. The fuel supply unit 40 is attached to the outer wall 30a of the fuel tank 30 so that the fuel pump unit 41 is housed inside, and the fuel supply device 40 discharges the fuel pumped from the fuel pump 42b to the fuel supply line 60. 45 and a return pipe 46 connected to a fuel return pipe 61 for returning surplus fuel from the fuel injection valve 23 into the fuel tank, and the fuel tank 30 is a recess that is partially lowered toward the side edge of the upper surface 34. 33, and a fuel supply device insertion port 36 for inserting and fixing the fuel pump portion 41 of the fuel supply device 40 is provided in the recess 33, and an upper surface positioned at a high position around the recess 33 faces the side edge. The fuel supply device 40 is attached to the fuel tank 30. In the attached state, the pressure regulating valve 50 accommodated inside the raised portion 44 raised from the flange portion 43 located outside the fuel tank 30, and the discharge pipe 45 and the return pipe 46 are vertically moved from the raised portion 44. A return pipe 46 that is provided in a shifted manner and that is disposed above the discharge pipe 45 is disposed toward the vertical wall portion 35 that stands up around the recess 33 of the fuel tank 30, while the discharge pipe 45 that is disposed below. Is disposed toward the side edge of the fuel tank 30, so that when the upper surface 34 of the fuel tank 30 around the recess 33 is inclined toward the side edge, the discharge pipe 45 and the return pipe 46 are Since it can be laid out without jumping out from the upper surface 34 of the fuel tank 30, it is possible to prevent the seat seat 10 located above the fuel tank 30 from bulging and to prevent the height of the seat seat from increasing. It is possible to reduce the size of the fuel supply device without affecting the seating performance. Kill.

DESCRIPTION OF SYMBOLS 1 ... Motorcycle, 10 ... Seating seat, 30 ... Fuel tank, 30a ... Outer wall, 33 ... Recessed part, 34 ... Upper surface, 35 ... Vertical wall part, 36 ... Fuel supply apparatus insertion port , 40 ... Fuel supply apparatus, 4 2 ... Main part , 42a ... Housing part, 42b ... Fuel pump, 43 ... Flange part, 44 ... Raised part, 45 ... Discharge pipe, 46 ... Return pipe, 47 ... Electric wire connector connection part , 50 ... Pressure regulating valve, 60 ... Fuel Supply pipe, 61 ... fuel return pipe, 64 ... electric wire connector.

Claims (8)

To accommodate the interior of the fuel tank fuel pump (42 b) from the outside of the fuel tank (30) (30), attached to the outer wall (30a) of said fuel tank (30),
The fuel tank (30) by being connected to a discharge external pipe provided outside (60) of the discharge pipe for discharging the fuel pumped from the fuel pump (42 b) to the discharge outer pipe (60) (45)
By connecting to a return external pipe (61) provided outside the fuel tank (30), a return pipe (46) for returning surplus fuel of the supply destination to the inside of the fuel tank (30),
In the fuel supply device (40) for supplying fuel from the fuel tank (30) to the supply destination,
The fuel supply device (40) is located outside the fuel tank (30) in a state of being attached to the fuel tank (30), and is attached to an outer wall (30a) of the fuel tank (30). A raised portion (44) raised from the flange portion (43), and a pressure regulating valve (50) accommodated in the raised portion (44),
The fuel supply device for a small vehicle, wherein the return pipe (46) is formed so as to extend from a portion of the raised portion (44) that overlaps the pressure regulating valve (50) in a plan view.   The fuel supply device for a small vehicle according to claim 1, wherein the discharge pipe (45) extends from a position below the return pipe (46) in the raised portion (44). The pressure regulating valve (50) has a cylindrical shape,
The fuel supply device for a small vehicle according to claim 2, wherein the discharge pipe (45) extends from a height range of the pressure regulating valve (50) in the raised portion (44).   The fuel supply device for a small vehicle according to any one of claims 1 to 3, wherein the discharge pipe (45) extends in a direction orthogonal to the return pipe (46) in plan view.   A connection portion (47) with the electric wire connector (64) of the fuel supply device (40) is disposed below the return pipe (46) and on an extension line in the extending direction of the discharge pipe (45). The fuel supply device for a small vehicle according to claim 4.   Arranged so that a part of the housing part (42a) of the fuel pump body (42) overlaps with an extension line in the discharge direction in which the fuel returned from the return pipe (46) is discharged from the pressure regulating valve (50). The fuel supply device for a small vehicle according to any one of claims 1 to 5, wherein the fuel supply device is for a small vehicle. The fuel tank (30) is disposed below a seating seat (10) on which an occupant sits, and has a recess (33) whose upper surface (34) is partially lowered,
The recess (33), the fuel pump unit (41) into the openings for securing (36) is provided in said fuel supply device (40),
The fuel tank (30) is arranged so that the return pipe (46) is positioned below the upper surface (34b) positioned at a higher position in a side view of the fuel tank (30). A small vehicle equipped with the fuel supply device for a small vehicle according to claim 1. An internal combustion engine (E),
A seat (10),
A fuel tank (30) located below the seat (10);
A fuel supply device (30) that is attached to the outer wall (30a) of the fuel tank (30) so as to accommodate the fuel pump (42b) from the outside of the fuel tank (30) and supplies the fuel to the supply destination ( 40)
The fuel supply device (40) is connected to a discharge external pipe (60) provided outside the fuel tank (30), so that the fuel pumped from the fuel pump (42b) is discharged to the outside of the discharge A discharge pipe (45) for discharging to the pipe (60);
It is provided in the fuel supply device ( 40 ) and connected to a return external pipe (61) provided outside the fuel tank (30), so that surplus fuel at the supply destination is supplied to the inside of the fuel tank (30). In a small vehicle (1) with a return pipe (46) to return to
The fuel tank (30) is formed with a recess (33) that is partially lowered toward the side edge of the upper surface (34), and the recess (33) has the fuel of the fuel supply device (40). An opening (36) is provided in which the pump ( 42b ) is inserted and fixed around the pump (42b), and an upper surface (34b) positioned higher around the recess (33) is inclined toward the side edge. Standing vertical wall (35) is provided,
The fuel supply device (40), the said fuel supply device located outside the fuel tank (30) said fuel tank mounted state (30) (4 0) flange portion (43), the flange A raised portion (44) raised from the portion (43), and a pressure regulating valve (50) accommodated in the raised portion (44),
The discharge pipe (45) and the return pipe (46) are provided to be shifted up and down from the raised portion (44),
Of the discharge pipe (45) and the return pipe (46), the pipe disposed above is directed toward the vertical wall (35) that stands up around the recess (33) of the fuel tank (30). Arranged,
A small size equipped with a fuel supply device, characterized in that the pipe arranged below the discharge pipe (45) and the return pipe (46) is arranged toward the side edge of the fuel tank (30). Vehicle (1).

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