JP5620662B2 - Motorcycle - Google Patents

Description

The present invention relates to a motorcycle, and more particularly, to a fuel tank of a motorcycle including a fuel pump in a fuel tank as a fuel supply device.

In the prior art (for example, Patent Document 1), a vehicle frame of a mono backbone frame type in which a single main frame extending rearward from a head pipe is disposed above an engine, and a fuel tank supported on the vehicle body frame. A motorcycle having a pump opening provided at the bottom of the fuel tank, the pump opening being closed with a lid that holds the fuel pump, and extending from the rear to the front of the fuel tank. It is disclosed that the fuel sucked from the rear part is supplied to the engine side. Further, a configuration is disclosed in which the insertion port of the fuel pump has an elliptical shape having a major axis in the vehicle width direction.

Further, as another conventional technique (for example, Patent Document 2), in a motorcycle arranged to straddle a fuel tank between a pair of left and right frames extending rearward from the head pipe, the vehicle in the vehicle front-rear direction higher than the lowest part of the fuel tank. A lower housing that extends between the lower frames is attached to the bottom wall of the middle part, and the intake part of the fuel pump is arranged. The intake part and the lowest part of the rear part of the fuel tank are connected by an external conduit. With the configuration where the lowest part of the fuel is sent from the fuel pump to the engine side via the external piping and the suction part, the remaining amount of the fuel tank is reduced, and the design and layout around the fuel tank are improved. It is disclosed that the capacity of a fuel tank is increased and that fuel shortage is prevented during sudden acceleration when the amount of remaining fuel is low.

JP 2003-72646 A Japanese Patent No. 3873646

Thus, conventionally, in a fuel tank that incorporates a fuel pump in the fuel tank, the fuel pump is disposed at the center in the front-rear direction (Patent Document 1) or extends from the rear to the front of the fuel tank. (Patent Document 2).
However, in the technique of Patent Document 1, since the fuel tank suction port and the lid are formed in an elliptical shape that is long in the left-right direction of the vehicle body, the width of the fuel tank in the vehicle width direction of the fuel tank increases, and the influence of the riding position of the driver Therefore, there is a problem that it is difficult to cope with the case where the upper surface of the rear portion of the fuel tank is squeezed downward and lowered.

Further, in the technique of Patent Document 2, it is considered that the bottom wall of the fuel tank can avoid interference with the main frame and the seat rail below the fuel tank, but only the number of parts such as external piping is increased. In addition, since the fuel pump is arranged in the center portion with sufficient height in the longitudinal direction of the vehicle body, it becomes difficult to cope with the case where it is desired to further reduce the height of the fuel tank due to restrictions such as the appearance of the vehicle body.
Therefore, an object of the present application is to enable miniaturization without increasing the number of arranged parts even if an in-tank pump is provided in a fuel tank of a type straddling a pair of left and right frames.

In order to solve the above-described problem, the invention of claim 1 is directed to a vehicle body frame having a pair of left and right frames (4) extending rearward from the head pipe, and a bottom wall (46c) supported across the pair of left and right frames. And a fuel tank (18) in which the pair of left and right frames are housed in a recess (46f) formed by left and right hanging parts (46g), and the hanging parts overlap the frame when viewed from the side, and a tank body of the fuel tank (46) comprising a fuel pump (74) inserted into the inside through an insertion port provided in the bottom, and this fuel pump forms a pump assembly (47) integrated with a flange (66) for mounting to the fuel tank; In a motorcycle in which the flange is attached to a pump attachment portion formed around the insertion port,
The rear center of the bottom wall constituting the tank body is a bulging portion (67) bulging downward, and the insertion port and the pump mounting portion are provided at the bottom of the bulging portion,
While disposing at least a part of the pump mounting portion on the pair of frames in a side view,
The pump mounting portion and the flange are formed in an elliptical shape or a rectangular shape in plan view, and the longitudinal direction thereof is arranged in the vehicle front-rear direction,
The tank body (46) includes a sub-tank (18a) depending on the outside of the frame (4).
The pump assembly (47) has a float switch (81) at the upper end of the fuel pump (74), and is provided with a float (80) extending from the float switch (81) in the vehicle forward direction.
The float (80) swings up and down in the sub-tank (18a) to detect the liquid level position of the fuel stored in the tank body (46) .
In addition, the float (80) is a longitudinal member, and its longitudinal front end is disposed in the vehicle front-rear direction and swings in the sub tank (18a) beyond the frame (4) in a side view,
In the fuel tank (18), the bottom (46c) of the front of the pump mounting portion (64) has a slope, and the fuel pump (74) is inclined forward along the bottom (46c). (74) is held in the fuel tank (18) via a stay (69) extending from the flange (66) .

In this way, the bulging portion is provided on the bottom wall of the fuel tank, the pump mounting portion is provided on the bulging portion, and the position of the pump mounting portion is set to at least one of the flanges with the pump mounting portion closed by the flange. If the unit is determined to overlap the pair of left and right frames when viewed from the side, the fuel pump mounting position with respect to the fuel tank is lowered, so the fuel pump is placed in the fuel tank without increasing the height of the upper surface of the fuel tank. It becomes possible to do. In addition, the degree of freedom for making the shapes of the upper, side, front, and rear portions of the fuel tank difficult to affect riding and running resistance is improved. Further, since the bottom of the bulging portion is the lowest among the bottoms of the fuel tank, fuel is collected, so that the ineffective remaining amount of the fuel tank is reduced relative to the engine side.
Moreover, the width | variety of the pump attachment part of a vehicle width direction becomes small by orientating the longitudinal direction of a pump attachment part to the front-back direction. For this reason, the width between the pair of left and right main frames can be narrowed, the increase in size of the tank in the width direction in the vehicle width direction can be suppressed, and the degree of freedom in design can be increased.

According to a second aspect of the present invention, in the first aspect, the pump mounting portion is provided at the lowest portion of the rear portion of the fuel tank. According to this configuration, since the fuel pump can be arranged at the lowest part and the fuel can be directly sucked by this fuel pump, no extra piping is required as compared with the prior art (Patent Document 2), and the number of parts is reduced. Decrease.

A third aspect of the present invention in the claim 1 or 2, wherein the fuel pump (74) is characterized in that its top is disposed inclined in the fuel tank to direct the front of the vehicle. According to this configuration, since the height of the fuel tank with respect to the fuel pump is substantially reduced, the degree of freedom in designing the fuel tank is improved.

Left and right A fourth aspect of the present invention in any one of the preceding claims 1 to 3, a pair of left and right frames, the pump attachment portion up to the vicinity of the extending parallel in a plan view, rearward from the pump mounting portion near the spacing between the pair of frames so spread.
According to such a configuration, it is possible to suppress interference with the pump mounting portion by widening the distance between the pair of left and right frames at the rear portion of the fuel tank that does not relatively affect the tank shape of the fuel tank. Increase in size can be suppressed.

According to a fifth aspect of the present invention, in the above-mentioned fourth aspect, the fuel tank filler port (56a) is disposed on the upper wall of the fuel tank near the front of the tank, and a drain pipe (71) connected to the fuel filler port is connected to the fuel tank. The fuel tank bottom part behind the pump mounting part is penetrated through the inside and is opened under the fuel tank.
Thus, by providing the drain pipe through the bottom wall behind the flange mounting portion, the drain pipe can be arranged without affecting the fuel outlet and piping from the pump arranged outside the tank.

In a sixth aspect of the present invention, in any one of the first to fifth aspects, the fuel pump is held by a pair of plate-like holding members (69) extending upward from the flange (66). The members are arranged apart from each other in the vehicle width direction .
With this configuration, the pump is held by the pair of left and right plate-like holding members (69), so that a wall that hinders fuel movement in the front-rear direction is not formed, and the remaining amount of fuel can be reduced.

The invention of claim 7 is the above-mentioned claim 4 or 6, wherein the bottom wall of the front fuel tank continuous with the bottom wall of the bulging portion forms a downward slope toward the bulging portion of the fuel tank, and the top of the downward slope And at least two support members for supporting the leaked fuel receptacle of the fuel supply port, and these support members are arranged with the plane portion parallel to the vehicle width direction in order to prevent the fuel in the fuel tank from shaking. It comprised with the plate-shaped member.
With this configuration, the holding member functions as a blocking wall that prevents the fuel from moving back and forth when the fuel on the bulging bottom wall moves in the front-rear direction. Therefore, the breathing of the fuel pump during acceleration and deceleration of the motorcycle Is suppressed.

Side view of a motorcycle equipped with a fuel tank according to the present invention Side sectional view of a fuel tank according to the present invention The figure which shows the structure of the fuel tank which concerns on embodiment of this invention 4 is a cross-sectional view taken along line 4-4 of FIG. Plan view showing the position of the fuel pump relative to the body frame Diagram showing the configuration of the fuel pump

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. In the description, descriptions of directions such as front and rear, right and left and up and down are for the vehicle body. In the figure, an arrow F indicates the front of the vehicle body, an arrow L indicates the left side of the vehicle body, and an arrow U indicates the upper side of the vehicle body. Further, the vehicle body left-right direction is appropriately referred to as a vehicle width direction.

FIG. 1 is a side view of a motorcycle 1 having a fuel tank according to an embodiment of the present invention. In the figure, the driver M of the motorcycle 1 is indicated by a two-dot chain line.
The motorcycle 1 includes a body frame 2 as shown in FIG. The body frame 2 of this configuration is a so-called double cradle type frame. As shown in FIG. 1, the vehicle body frame 2 has a head pipe 3 disposed at the front end thereof, a left and right branch from the head pipe 3, and a gentle downward downward and rearward extension. A pair of left and right main frames 4 extending substantially downward, and right and left branching from the head pipe 3 to the left and right, extending downward obliquely downward, and extending rearward substantially horizontally via the curved portion 5a. A pair of down pipes 5 is provided.

The body frame 2 further includes a pair of left and right seat rails 6 extending rearward and slightly rearward from the vicinity of the curved portions 4a of the pair of left and right main frames 4, and a pair of left and right main rails 4 disposed below the main frames 4 . The pivot plate 7 includes a pair of left and right reinforcing stays 8 extending obliquely rearward and upward from the pivot plate 7 and connected to the seat rail 6. A rear cushion mounting bracket 8 a for supporting the upper end portion of the rear cushion 33 is provided in the vicinity of the connecting portion between the reinforcing stay 8 and the seat rail 6. A pivot 9 is provided on the pair of left and right pivot plates 7.

As shown in FIG. 1, a pair of left and right front forks 10 are rotatably supported on the head pipe 3, and a steering handle 12 is attached to the upper ends of these front forks 10 by a top bridge 11. ing. Further, a meter 13 including a speedometer and a headlight 14 are attached in the vicinity of the upper portion of the front fork 10, and a front wheel 16 integrated with a brake disk 15 is rotatable at the lower end portion of the front fork 10. A front fender 17 that covers the upper portion of the front wheel 16 is fixed to the upper side of the support portion.

A fuel tank 18 is disposed in the pair of left and right main frames 4, and an engine 19 is disposed below the fuel tank 18, that is, between the main frame 4 and the down pipe 5 in a side view of the vehicle body frame 2. Has been. The engine 19 in this configuration is a so-called air-cooled parallel 4-cylinder engine.

The engine 19 is disposed below the main frame 4 and supported by an engine mount 20 and the like fixed to the down pipe 5. The engine 19 includes a crankcase 21, a cylinder block 22 coupled to the upper front of the crankcase 21, a cylinder head 23 coupled to the upper portion of the cylinder block 22, and an upper portion of the cylinder head 23. And a head cover 24. Around the cylinder block 22 and the cylinder head 23, cooling fins 25 are provided for cooling them by air cooling.
A fuel supply device 63 having an injector of an electronic fuel injection device is connected to the cylinder head 23. However, the fuel supply device 63 may be a carburetor.

The cylinder block 22 is provided with a cylinder, and a piston is accommodated in the cylinder 22 so as to freely reciprocate. The crankcase 21 below the cylinder block 22 is supported by a crankshaft connected to the piston via a connecting rod and an engine output shaft 26, and a power transmission mechanism is provided between the crankshaft and the engine output shaft 26. The clutch mechanism, the transmission, etc. which comprise are accommodated.

A drive chain (not shown) is spanned between a sprocket mounted on the engine output shaft 26 and a sprocket 28 mounted on a rear wheel 27 described later, and the rotation of the engine 19 is a power transmission mechanism. And the like are transmitted to the rear wheel 27.
Further, an exhaust pipe 29 extending downward from the front side of the engine 19 is connected to the cylinder head 23, and an exhaust muffler 30 is connected to the exhaust pipe 29. The exhaust muffler 30 extends from the lower side of the vehicle body frame 2 to the right side of the vehicle body and extends obliquely rearward.

An oil cooler 31 is disposed in front of the down pipe 5 in front of the cylinder head 23, and an air cleaner and a fuel supply device 63 are disposed behind the cylinder head 23. The oil cooler 31 is fixed to the front side of the down pipe 5.
A rear swing arm 32 is supported on the pivot plate 7 of the vehicle body frame 2 via a pivot 9 so as to be swingable in a substantially vertical direction. A rear cushion 33 is interposed between the upper rear end of the rear swing arm 32 and the seat rail 6, and a brake disc 34 and an integrated rear wheel 27 are rotatably supported at the rear end of the rear swing arm 32. Has been.
A step holder 35 extending rearward is fixed to the pivot plate 7. Folding drivers and passenger steps 36 and 37 are attached to the front and rear portions of the step holder 35. Has been.

A fuel tank 18 is disposed above the pair of left and right main frames 4 in the body frame 2 so as to straddle the pair of main frames 4. A seat 38 is attached to the upper portion of the seat rail 6 behind the fuel tank 18 so as to cover the seat rail 6 from substantially above. In addition, a pair of lower parts of the fuel tank 18 below the knee of the driver M (hereinafter referred to as “crus”) is brought into contact with the lower side of the rear part of the fuel tank 18 when the driver M takes a sitting posture. A knee cover 39 is provided. The knee covers 39 are disposed at both the left and right ends of the above-described air cleaner.

A side cover 40 is disposed behind the knee cover 39. A grab bar 41 and a rear turn signal 42 that are held by the passenger are attached to the rear portion of the seat rail 6 of the body frame 2, and a rear fender 43 having a substantially arc shape in side view is attached as an exterior product. A tail lamp 44 and a license plate 45 are attached to the rear fender 43.

Next, the overall structure of the fuel tank will be described. 2 is a side sectional view of the fuel tank cut in the front-rear direction along the center of the vehicle body, FIG. 3 is a view showing the structure of the fuel tank, (a) is a side view of the fuel tank, and (b) is a side view of the fuel tank. The bottom view of a fuel tank, (c) is a figure which shows the cross section of a fuel tank lower part schematically, (d) is a bottom view of a fuel leak receiving part, (e) is a bottom view of a flange mounting seat. 4 is a cross-sectional view taken along line 4-4 of FIG. 3, and FIG. 5 is a plan view showing the position of the fuel pump with respect to the vehicle body frame (the fuel tank is indicated by a virtual line).

As shown in FIG. 2, the fuel tank 18 is configured by attaching a pump assembly 47 to a tank body 46. The pump assembly 47 is formed by integrating a fuel pump 74 and the like on a flange 66, and a portion excluding the flange 66 is inserted into the inside from below the rear end of the tank body 46, and extends along the extending direction of the main frame 4. The tank body 46 extends from the rear side to the front side.

The tank body 46 is configured by overlapping an outer member and an inner member into a hollow body. As shown in FIG. 3, the outer member includes a front wall 46a, an upper wall 46b curved upward, and a rear wall 46d. A side wall 46e having a curved surface that curves outwardly is provided, and these are integrally formed by press molding or the like. A bottom wall 46c inner member is tilted backward slowly, with a depending portion 46g extending bent from the left and right downward, are formed by press molding them together.

As shown in FIG. 3C, the bottom wall 46c and the left and right hanging parts 46g form a recess 46f for straddling the pair of left and right main frames 4. The drooping portion 46g is arranged at an interval to the inside of the side wall 46e, and a sub tank that hangs outside the main frame 4 between the drooping portion 46g and the side wall 46e by coupling and integrating the peripheral portions of the drooping portion 46g and the side wall 46e. 18a is formed. The hanging portion 46g and the sub tank 18a overlap the outside of the main frame 4 in a side view. The sub tank 18a communicates with a main tank formed above the bottom wall 46c, and is also a side tank formed on both the left and right sides of the fuel tank 18.

As shown in FIG. 3A, the front portion of the tank body 46 is engaged with a convex portion 48 a protruding outward from the front side surface of the pair of main frames 4 to support the front portion of the tank body 46. A U-shaped engaging portion 48 is provided at the front portion of the hanging portion 46g (see FIG. 3C). Further, as shown in FIG. 5, a stay 50 that extends on the cross plate 49 that connects the front end portions of the pair of seat rails 6 protrudes rearward from the rear portion of the tank body 46. The stay 50 is fastened to a mounting portion 52 provided on the cross plate 49 by a bolt 51. The stay 50 is provided with a buffer 53 made of rubber (see FIG. 5).

Therefore, the front part of the tank body 46 is locked to the convex part 48a of the main frame 4 by the engaging part 48, and the stay 50 at the rear end part to which the buffer body 53 is attached is put on the attaching part 52 of the cross plate 49, If the body 53 is fastened with the bolts 51, the fuel tank 18 can be quickly attached to the pair of main frames 4 and the pair of seat rails 6. In this state, as shown in FIG. 2, since the front part of the fuel tank 18 is high and the height of the rear part is the lowest, the fuel in the fuel tank 18 collects in the rear part of the tank body 46 when the remaining amount is low. Be able to.

The oil filler 54 is disposed at the top provided near the front portion of the upper wall 46b of the tank body 46, and a gas-liquid separator 55 that separates the evaporated fuel into gas and liquid is disposed below the oil filler 54. Is done. As shown in FIG. 2, the oil filler 54 is detachably screwed to a base 56 that substantially borders the opening provided at the top of the upper wall 46 b to form a fuel inlet 56 a, and to the base 56. And an oil supply cap 57 for opening and closing the oil supply port 56a. A fuel receiving recess 58 is formed around the upper portion of the base 56 by recessing a part of the upper wall 46 b downward, and rainwater accumulated in the periphery and leaked fuel falling from the base 56 are discharged through the fuel receiving recess 58. .

The gas-liquid separator 55 is located in the vicinity of the base 56, and as shown in FIGS. 2 and 3A and 3D, a pipe-shaped peripheral frame 60 having an annular shape and the peripheral frame 60 The gas containing the fuel evaporated in the fuel tank enters into the peripheral frame 60 from the opening 60c provided in the peripheral frame 60 in advance, and inside the peripheral frame 60 Gas-liquid separation into gas and liquid fuel. When the inside of the peripheral frame 60 is filled with a predetermined amount of liquid fuel, the liquid fuel in the peripheral frame 60 is discharged outside the fuel tank from a drain pipe 71 described later.

The periphery of the peripheral frame 60 is supported by a plurality of support members 62 at appropriate intervals in the circumferential direction. Each support member 62 is formed of a strip-shaped metal plate bent in a substantially L shape, and is welded by bending the upper end portion thereof to contact the outer periphery of the peripheral frame 60 and welding the lower end portion on the bottom wall 46c. It is fixed by welding such as spot welding.

Each support member 62 also functions as a blocking wall (baffle plate) that suppresses fuel movement in the fuel tank and suppresses fluctuations in the fuel level. Moreover, a predetermined number of through-holes 62a having a hollow shape are formed in each support member 62. In addition to the purpose of reducing the weight, the through hole 62a generates a passage resistance due to the passage of the fuel when the fuel is moved, thereby adjusting the fuel movement to an appropriate speed. The support member 62 itself is also a resistance member that prevents rapid fuel movement.

For this reason, since rapid fuel movement accompanying acceleration and deceleration can be suppressed and large fluctuations in the fuel level can be suppressed, the engine load on the fuel supply device 63 (see FIG. 1) attached to the intake system of the engine 19 can be reduced. The fuel corresponding to the rotational speed can be stably supplied from the pump assembly 47. As a result, the occurrence of breathing and running out of fuel during acceleration / deceleration is reduced.

In addition, the support member 62 disposed on the rear side of the gas-liquid separator 55 is located on the center of the vehicle body, and the plane is disposed in parallel with the vehicle width direction, so that the fuel is moved back and forth in a large area. Therefore, the function of suppressing the fuel movement can be more effectively exhibited.
Further, the lower end portion 62b of the support member 62 is bent substantially horizontally, and is welded onto a stepped portion 83 that is formed in the middle portion of the bottom wall 46c in the front-rear direction and has a top portion that is substantially horizontal. .

A reference numeral 71 shown in FIG. 3B is a drain pipe, which is a member for discharging the fuel filled in the gas-liquid separator 55 to the outside. The upper end 71 a is bent into the vicinity of the liquid separator 55 and extends upward, and the upper end 71 a enters the peripheral frame 60 through a hole 60 a formed in the lower portion of the peripheral frame 60 and opens near the upper surface 60 b of the peripheral frame 60. A plurality of openings 60c are provided in the upper surface 60b of the peripheral frame 60 at appropriate intervals in the circumferential direction, from which gas including evaporated fuel that fills the vicinity of the fuel filler port 56a enters the peripheral frame 60. The liquid fuel that has been gas-liquid separated in the peripheral frame 60 and accumulated in a predetermined amount enters the drain pipe 71 from the upper end 71a, falls in the drain pipe 71, and is discharged to the lower side of the fuel tank 18 from the lower end 71b.

As shown in FIG. 2, the drain pipe 71 extends obliquely downward to the rear above the bottom wall 46c, and the lower end portion 71b is a take-out portion 46h formed on the right side of the flange mounting seat 64 at the rear end portion of the bottom wall 46c. , It goes down and opens downward to open to the atmosphere.
A flange mounting seat 64 is provided at the center in the vehicle width direction at the rear portion of the tank main body 46, which is the lowest part of the tank main body 46, and the flange 66 is attached to the flange main body 46 via a seal 65 so that the flange mounting seat 64 is inserted. The mouth 64a is sealed.
Reference numerals 71c and 71d in FIG. 3B are stays for guiding the drain pipe 71, and one ends of the stays are fixed on the bottom wall 46c.

As shown in FIG. 3E, the flange mounting seat 64 is welded to the periphery of the opening 67a so as to surround an opening 67a formed at the bottom of the bulging portion 67 that bulges the rear portion of the bottom wall 46c downward. An insertion port 64a having the same shape and size as the opening 67a is provided at the center side.
The edge surrounding the insertion port 64a of the flange mounting seat 64 forms a sealing surface 64b, the outer peripheral side thereof forms a mounting seat 64c, and stud bolts 68 are provided at equal intervals in the circumferential direction. A flange 66 is overlaid on the flange mounting seat 64 and is integrated by fastening to the stud bolt 68 with a nut 68a (FIG. 4).

As shown in FIGS. 2 and 4, the bulging portion 67, protruding forms so as to form a wall you inclined to the vehicle body center side toward the rear central portion of the bottom wall 46c downward, the opening 67a at the bottom thereof The tank body 46 is formed integrally and continuously with the bottom wall 46c at the rear of the tank body 46.

As apparent from FIG. 4, the bottom portion in which the opening 67 a is formed, the flange mounting seat 64, and the flange 66 attached thereto are both positioned between the left and right main frames 4.

As shown in FIG. 2, the front portion of the flange mounting seat 64 is disposed so as to partially overlap the pair of left and right main frames 4 in a side view as viewed from the vehicle width direction.
This overlap is sufficient if at least a part of each of the flange mounting seat 64 and the main frame 4 overlaps. Further, it is located below the flange mounting seat 64 and above the front end of the seat rail 6.

As is apparent from FIG. 3B, the flange mounting seat 64 has a major axis in the longitudinal direction of the tank body 46 along the front-rear direction, and an ellipse in plan view having a minor axis in the width direction of the tank body 46. Shaped or rectangular. In this case, the rectangular form includes a rectangular corner portion (corner portion) that is modified. The flange 66 has the same shape.

By doing so, as shown in FIG. 5, the flange mounting seat 64 is arranged long in the front-rear direction between the left and right main frames 4 and the seat rail 6 in a plan view, and the short axis direction with a narrow width is set to the vehicle width. Since the width in the vehicle width direction between the left and right main frames 4 and the seat rails 6 can be narrowed, it is possible to contribute to slimming of the vehicle body.

Next, the pump assembly 47 will be described. The pump assembly 47 has a suction portion for sucking fuel in the lower portion, and a compact device that supplies the fuel to the fuel supply device 63 by filtering the sucked fuel through a filter is adopted. FIG. 6 shows an example of such a fuel injection pump.
6A shows a plan view of the pump assembly 47, and FIG. 6B shows a side view. The pump assembly 47 is formed by integrating a fuel pump 74 with a flange 66 via a stay 69.

In this case, the stay 69 and the fuel pump 74 are arranged at a predetermined angle with respect to the flange 66, specifically, when the pump assembly 47 is inserted into the tank body 46 and when the insertion is completed, 46b and the bottom wall 46c of the tank body 46 are attached to each other at an angle that can form an interval that does not cause interference (see FIG. 2).
The pair of stays 69 are formed of a plate-like member having a substantially U-shape in plan view in FIG. 6A, and the left and right portions are arranged at intervals in the minor axis direction of the flange 66. A cross part connecting the parts is mounted on the flange 66.

A fuel pump 74 is sandwiched between the left and right portions of the stay 69. As shown in (b), the left and right portions of the stay 69 have arm shapes that curve forward and protrude long, and the fuel pump 74 is connected and fixed by a bolt 69a.
Since the stay 69 is substantially U-shaped and is disposed open in the front-rear direction, the fuel can be quickly moved in the front-rear direction, and the ineffective remaining amount of fuel can be reduced.
The flange 66 overlaps with the flange mounting seat 64 from below and functions as a lid member that covers and closes the insertion port 64a of the flange mounting seat 64. The outer periphery of the flange 66 has a shape overlapping the flange mounting seat 64, and each stud bolt Corresponding to 68, a through hole 70 through which the stud bolt 68 passes is provided.

As shown in FIG. 6B, a fuel suction portion 79 is disposed on the flange 66, and an upstream filter 72 for filtering the fuel to be sucked is provided around the flange.
The suction portion 79 is connected to a pressurizing fuel pump 74 via a suction pipe 73, and the fuel pump 74 is connected to a downstream filter unit 75. The downstream filter unit 75 is composed of a dense filter such as a non-woven fabric so as to perform finer filtration than the upstream filter 72.

One end of a pipe 76 is connected to the downstream filter unit 75, and the other end passes through the flange 66 and supplies fuel to the fuel supply device 63 (FIG. 1) via a high-pressure fuel pipe (not shown). A clamp 77 supports one end of the pump hose 76 on the lower surface of the flange 66. One end of the pump hose 76 that protrudes below the flange 66 forms a fuel outlet and a fuel pipe outside the fuel tank. Reference numeral 78 denotes a return hose that returns excess pressure fuel sent from the fuel pump 74 to the vicinity of the suction portion 79 .

The pump assembly 47 is electrically connected to a power line (not shown), and power for operating the pump assembly 47 is supplied. With this configuration, the fuel in the fuel tank 18 is sucked up by the pump assembly 47, and the fuel is sent in the order of the suction portion 79 → the pressurized fuel pump 74 → the downstream filter unit 75 → the pump hose 76.

On the side of the pump assembly 47, a float 80 is provided for detecting the liquid level position of the fuel stored in the tank body 46. The float 80 operates a float switch 81 disposed in the vicinity of the upper end portion of the fuel pump 74 according to the position of the fuel level.

Next, the operation of this embodiment will be described. First, attachment of the pump assembly 47 to the tank body 46 will be described. In FIG. 2, from the lower side of the tank body 46, the fuel pump 74 side of the pump assembly 47 is inserted into the insertion port 64a of the flange mounting seat, and the portion excluding the flange 66 is above the bottom wall 46c in the tank body 46. Then, it is inserted toward the front, and is arranged so as to be inclined forward from the rear side in the tank body 46 to the front side substantially along the inclination of the bottom wall 46c.
Subsequently, the flange 66 is overlapped on the flange mounting seat 64 via the seal 65, the stud bolt 68 is passed through the through hole 70 of the flange 66, and the nut 68a is fastened from below to integrate.

When the fuel tank 18 in which the pump assembly 47 is integrated is supported across the main frame 4 and the seat rail 6, as shown in FIG. 4, the bulging portion 67, the flange mounting seat 64, and the flange 66 are obtained. Is located between the left and right main frames 4.
As described above, when the bulging portion 67 provided with the flange mounting seat 64 is provided between the left and right main frames 4, the flange 66 of the pump assembly 47 serving as an in-tank pump can be attached to the fuel tank 18. Only the height from the flange mounting seat 64 to the upper wall 46b can be increased without changing the height of the upper wall 46b. For this reason, an in-tank pump can be provided without changing the design of the tank body 46, and a design that does not affect the riding, running resistance, and appearance can be adopted. Can be improved.

Further, since the portion of the pump assembly 47 in the tank body 46 is inclined forward so that the tip portion thereof is directed toward the front of the vehicle, the height of the pump assembly 47 in the tank body 46 can be suppressed, The degree of freedom in designing the fuel tank can be improved.

Further, since the pump assembly 47 is arranged at the lowest position of the fuel tank 18 and the fuel can be directly sucked at this mounting position, an extra piping is required as in the case of sucking fuel from a position different from the mounting position. It becomes unnecessary and the number of parts can be reduced.
In addition, a bulging portion 67 having a volume smaller than the volume of the tank main body 46 is formed in the lowest portion, and the suction portion of the pump assembly 47 is disposed in the bulging portion 67. Occurrence can be prevented.

As is apparent from FIG. 5, in a plan view, the pair of left and right main frames 4 are disposed substantially parallel below the fuel tank 18, and the pair of left and right seat rails 6 are rearward at the rear of the fuel tank near the flange 66. Since the arrangement is expanded, it is possible to suppress an increase in the size of the fuel tank 18 while suppressing interference with the flange 66.

Further, the flange 66 has an elliptical shape or a rectangular shape in plan view, and a major axis is arranged in the front-rear direction of the tank body 46, that is, the longitudinal direction of the tank body 46, and the minor axis is arranged in the width direction of the tank body. 4 and a seating space for the flange 66 are secured between the seat rails 6.
Thereby, since the width of the flange 66 in the vehicle width direction can be suppressed, the width between the pair of main frames 4 can be reduced, and the fuel tank 18 can also be prevented from being enlarged in the vehicle width direction. In particular, since the width in the vehicle width direction at the rear side of the side surface of the fuel tank 18 serving as the knee grip portion can be reduced, a good knee grip can be realized.

In addition, since the fuel pump 74 has a pair of left and right plates and is supported by a stay 69 whose plane is arranged parallel to the front-rear direction, there is a portion that should become a barrier when fuel moves in the front-rear direction. Since it does not exist, the remaining amount of fuel can be reduced.
Further, since the support member 62 that supports the gas-liquid separator 55 is provided in the vicinity of the top of the inclined bottom wall 46c, the support member 62 is used to function so as to prevent the fuel from moving back and forth and The breathing of the fuel pump during deceleration can be reduced.
Further, since the drain pipe 71 penetrates downward from the take-out portion 46h provided on the bottom wall 46c behind the flange mounting seat 64 and exits downward, the fuel located below the flange 66 which is outside the fuel tank 18 The drain pipe 71 can be arranged without affecting the outlet and the piping.

2: body frame, 3: head pipe, 4: main frame, 18: fuel tank, 46c: bottom wall of fuel tank, 46f: recess, 64: flange mounting seat, 64a: insertion port, 66: flange, 67: swelling Outlet part 79 : Suction part

Claims (8)

A body frame having a pair of left and right frames (4) extending rearward from the head pipe, and a recess (46f) supported by the pair of left and right frames and formed by a bottom wall (46c) and left and right hanging parts (46g). The pair of left and right frames are housed in the fuel tank (18), and the fuel tank (18) whose hanging part overlaps the frame in a side view is inserted into the fuel tank (18) and an insertion port provided at the bottom of the tank body (46) of the fuel tank. A pump assembly (47) including a fuel pump (74) and integrated with a flange (66) for mounting the fuel pump to the fuel tank is formed, and the flange is connected to a pump mounting portion formed around the insertion port. In the mounted motorcycle,
The rear center of the bottom wall constituting the tank body is a bulging portion (67) bulging downward, and the insertion port and the pump mounting portion are provided at the bottom of the bulging portion,
While disposing at least a part of the pump mounting portion on the pair of frames in a side view,
The pump mounting portion and the flange are formed in an elliptical shape or a rectangular shape in plan view, and the longitudinal direction thereof is arranged in the vehicle front-rear direction,
The tank body (46) includes a sub-tank (18a) depending on the outside of the frame (4).
The pump assembly (47) has a float switch (81) at the upper end of the fuel pump (74), and is provided with a float (80) extending from the float switch (81) in the vehicle forward direction.
The float (80) swings up and down in the sub-tank (18a) to detect the liquid level position of the fuel stored in the tank body (46) .
The float (80) is a longitudinal member, and its front end in the longitudinal direction is arranged in the vehicle front-rear direction, swings in the sub tank (18a) beyond the frame (4) in a side view,
In the fuel tank (18), the flange (46c) has a bottom surface (46c) in front of the pump mounting portion (64) having a slope, and the fuel pump (74) is inclined forward along the bottom portion (46c). 66) A motorcycle characterized in that the fuel pump (74) is held in the fuel tank (18) via a holding member (69) extending from 66) . 2. The motorcycle according to claim 1, wherein the pump mounting portion is provided at a lowest portion of the rear portion of the fuel tank. The motorcycle according to claim 1 or 2, wherein the fuel pump (74) is inclined and arranged in the fuel tank so that a top portion thereof is directed forward of the vehicle. The pair of left and right frames extend in parallel in plan view up to the vicinity of the pump mounting portion, and a distance between the pair of left and right frames is widened from the vicinity of the pump mounting portion toward the rear. 3. The motorcycle according to any one of three . The fuel tank refueling port (56a) is arranged on the upper wall of the fuel tank near the front of the tank, and a drain pipe (71) connected to the fuel refueling port passes through the fuel tank and is located behind the pump mounting portion. The motorcycle according to any one of claims 1 to 4, wherein a motorcycle is opened under the fuel tank. The fuel pump is held by a pair of plate-like holding members (69) extending upward from the flange (66), and the pair of holding members are spaced apart from each other in the vehicle width direction. The motorcycle according to any one of claims 1 to 5. The bottom portion of the fuel tank forms a downward slope toward the bulging portion of the fuel tank, and at least two or more support members are provided on the top of the downward slope to support a leaked fuel receiver of the fuel supply port. 7. The member according to claim 1, wherein the member is composed of a plate-like member having a flat surface arranged in parallel with the vehicle width direction in order to prevent the fuel in the fuel tank from shaking. Motorcycle. The motorcycle according to claim 1, wherein the float switch (81) is a longitudinal member, and is inclined forward so that a longitudinal front end thereof faces a bottom portion of the tank body (46).

Images