JP5064110B2 - Fuel supply structure for small vehicles - Google Patents

Description

  According to the present invention, the vehicle body frame includes a head pipe that supports the steering handle and the front fork so as to be steerable, and a hollow main pipe that extends rearwardly downward from the head pipe and at least partially forms a fuel passage. A fuel supply pipe for supplying fuel to the fuel passage is connected to the main pipe, and a fuel tank supplied from the fuel supply pipe through the fuel passage is connected to a lower portion of the main pipe, in particular, The present invention relates to the improvement of the fuel supply structure.

Patent Document 1 discloses a scooter type motorcycle in which a main pipe connecting between a head pipe and a rear frame is used as a fuel passage for supplying fuel into a fuel tank.
Japanese Patent Publication No. 6-15353

  By the way, in what is indicated by the above-mentioned patent documents 1, the lower end of the main pipe is directly connected to the fuel tank, and the oil supply pipe is directly connected to the upper part of the main pipe. For this reason, not only is the shape and arrangement of the fuel tank restricted, but it is difficult to remove the fuel tank, resulting in a decrease in maintainability, and the fuel pipe is not only restricted in arrangement but also difficult to remove. As a result, the maintainability is reduced.

The present invention has been made in view of such circumstances, and purpose thereof is to provide a fuel oil supply structure in a small vehicle which enables to enhance the maintenance to increase the degree of freedom in the shape and arrangement of the fuel tank To do.

To achieve the above Symbol purpose, a first aspect of the present invention, the vehicle body frame includes a head pipe for supporting a steering handle and a front fork steerably, the at least one extends rearwardly and downwardly from the head pipe A hollow main pipe that forms a fuel passage, a fuel pipe for supplying fuel to the fuel passage is connected to the main pipe, and a fuel tank that is fed from the fuel pipe through the fuel passage is provided In the small vehicle connected to the lower portion of the main pipe, the lower portion of the main pipe is closed by a closing member that defines the lower end position of the fuel passage, and one end of a flexible lower connection pipe communicates with the fuel passage. Thus, it is connected to the side surface of the main pipe at a position above the closing member, and the other end of the lower connecting pipe is connected to the fuel tank. And wherein the door.

  According to a second aspect of the invention, in addition to the configuration of the first aspect of the invention, the other end of the lower connecting pipe is located below the connecting portion of the lower connecting pipe to the main pipe. It is connected to the upper surface.

  According to a third aspect of the present invention, in addition to the configuration of the first or second aspect of the present invention, a connecting portion to the fuel tank at the other end of the lower connecting pipe is connected to the main pipe at one end of the lower connecting pipe. The lower connecting pipe is bent in a plan view so as to be offset to the left or right with respect to the connecting portion.

  According to a fourth aspect of the present invention, in addition to the configuration of the third aspect of the present invention, a side stand is disposed on one side of the vehicle body frame, and a connection portion of the lower connection pipe to the fuel tank is the lower connection pipe. It is characterized by being arranged offset to the side where the side stand is arranged with respect to the connecting part to the main pipe.

The invention of claim 5, wherein, in addition to the configuration of the invention according to any one of claims 1 to 4, one end of the upper connecting tube having a flexible connected to the oil supply pipe, the upper connecting pipe The other end is connected to the main pipe so as to communicate with the fuel passage.

  According to a sixth aspect of the present invention, in addition to the configuration of the first aspect of the present invention, the oil supply pipe is arranged to be deviated to the left and right sides with respect to the axis of the main pipe. It is characterized by.

According to a seventh aspect of the invention, in addition to the configuration of the sixth aspect of the invention, an accelerator cable is routed along the main pipe on the side where the oil supply pipe is arranged with respect to a vertical plane including the axis of the main pipe. The invention according to claim 8, wherein a main switch is disposed on the opposite side of the vertical plane from the oil supply pipe and the accelerator cable, and a wire harness is routed along the main pipe. In addition to the configuration of the invention according to any one of claims 1 to 7, a side stand is disposed on one side of the vehicle body frame, and a side on which the side stand is disposed with respect to a vertical plane including the axis of the main pipe; Is provided with an air vent on the upper surface of the fuel tank on the opposite side, and the other end of the air vent conduit connected to one end of the air vent is connected to the fuel supply It is connected to a pipe.

  According to a ninth aspect of the invention, in addition to the configuration of the eighth aspect of the invention, the air vent conduit extends along the main pipe on the side where the oil supply pipe is disposed with respect to a vertical plane including the axis of the main pipe. It is characterized by being routed.

  The plug 35 of the embodiment corresponds to the closing member of the present invention, and the breather tube 48 of the embodiment corresponds to the air vent conduit of the present invention.

  According to the first aspect of the invention, since the main pipe and the fuel tank are connected by the flexible lower connecting pipe, the degree of freedom of the shape and arrangement of the fuel tank is increased, and the fuel tank is removed from the main pipe. It can be easily removed, and maintainability can be improved. In addition, between the fuel passage in the main pipe and the connecting portion between the closing member at the lower part of the main pipe and the main pipe at one end of the connection pipe can be used as a reservoir, and foreign matter that has entered the fuel passage from the fuel supply pipe can be removed. Invasion of foreign matter into the fuel tank can be suppressed by storing in the reservoir.

  According to the invention described in claim 2, since the lower connecting pipe is connected to the upper surface of the fuel tank below the connecting portion of the lower connecting pipe to the main pipe, the amount of stored fuel in the fuel tank is small. Even if the small vehicle is started and stopped frequently, the forward / backward movement of the fuel in the fuel tank will be restricted by the front and rear walls of the fuel tank. By being done frequently, the fuel in the fuel tank is prevented from moving to the fuel passage side in the main pipe, the weight balance of the front and rear of the small vehicle is suppressed, and the remaining fuel amount can be accurately grasped It becomes.

  According to the third aspect of the invention, since the lower connecting pipe is bent and disposed, the movement of fuel from the fuel tank to the fuel passage in the main pipe can be more effectively suppressed.

  According to the fourth aspect of the invention, since the lower connecting pipe is bent toward the side where the side stand is disposed, the fuel can be smoothly and effortlessly supplied from the oil supply passage to the fuel tank when refueling in the parking state with the side stand set up. Can be injected.

  According to the fifth aspect of the present invention, since the oil supply pipe and the main pipe are connected by the flexible upper connecting pipe, the degree of freedom of the arrangement of the oil supply pipe is increased and the oil supply pipe can be easily removed from the main pipe. It can be removed, and maintainability can be improved.

  According to the sixth aspect of the present invention, the oil supply pipe is arranged at a position that does not overlap the main pipe in a rear view, thereby suppressing the rearward projection of the oil supply pipe and suppressing the interference with the occupant. Can be achieved.

  According to the seventh aspect of the present invention, the accelerator cable is routed on the side where the oil supply pipe is arranged with respect to the vertical plane including the axis of the main pipe, and the main switch is located on the opposite side of the vertical plane from the oil supply pipe and the accelerator cable. Since the wire harness is routed while being disposed, an efficient layout that is not affected by the fuel becomes possible.

  According to the eighth aspect of the present invention, since the air vent is provided on the upper surface of the fuel tank on the side opposite to the side where the side stand is arranged with respect to the vertical plane including the axis of the main pipe, When refueling, the air in the fuel tank can be surely removed and the fuel can be reliably refueled in the fuel tank.

  Furthermore, according to the ninth aspect of the present invention, the fuel system is connected to the main pipe by arranging the air vent conduit along the main pipe on the side where the oil supply pipe is arranged with respect to the vertical plane including the axis of the main pipe. Maintainability can be improved by arranging them on the left and right sides.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on examples of the present invention shown in the accompanying drawings.

  1 to 6 show a first embodiment of the present invention. FIG. 1 is a left side view of a scooter type motorcycle, FIG. 2 is a left side view of a vehicle body frame and a fuel tank, and FIG. FIG. 4 is a perspective view of a part of a vehicle body frame and a fuel tank, and FIG. 6 is a longitudinal sectional view showing a front part of the fuel tank and a lower part of the main pipe. is there.

  1 to 4, a body frame FA of a scooter type motorcycle which is a small vehicle is connected to a front fork 11 straddling the front wheel WF and a top end of the front fork 11 so as to pivotally support the front wheel WF at a lower end portion. A head pipe 13 that supports the steering handle 12 to be steerable, a hollow main pipe 14 that extends rearwardly downward from the head pipe 13, and a pair of left and right that is coupled to the lower portion of the main pipe 14 and extends rearward. Lower frame 15, 15, cross pipe 16 connecting the rear ends of both lower frames 15, and a pair of left and right rear frame pipes 17, 17 each having a front end connected to both ends of the cross pipe 16. Prepare.

  The lower frame 15 is joined to the left and right sides of the lower portion of the main pipe 14 by welding and extends laterally, and the rear extension 15a extends rearward from the outer ends of the lateral extensions 15a. The rear ends of the rear extension portions 15b are joined to the left and right end portions of the cross pipe 16 by welding.

  A power unit P including an engine E disposed on the front side of the rear wheel WR and a transmission device M disposed on the left side of the rear wheel WR is provided at the front of both rear frame pipes 17 in the body frame FA. The rear wheel WR is pivotally supported on the rear portion of the power unit P. The rear wheel WR is supported by the link 18 so as to be able to swing vertically.

  The transmission device M is housed in a transmission case 20 that is connected to the crankcase 19 of the engine E and extends to the left side of the rear wheel WR, and includes a rear portion of the transmission case 20 and a pair of left and right rear frame pipes 17. A rear cushion unit 21 is provided between the left rear frame pipe 17.

  A storage box 23 capable of storing a helmet or the like is supported between the rear frame pipes 17 ... so as to be disposed above the engine E, and an occupant seat 24 that covers the storage box 23 from above can be opened and closed. Is supported on the upper front side of the storage box 23. A part of the engine E and the vehicle body frame FA are covered with a vehicle body cover 26 having a step floor 25 on which a passenger's foot on the passenger seat 24 is placed.

  Of the two lower frames 15 in the vehicle body frame FA, a rear portion 15b of the left lower frame 15 has an upright position to stand on the road surface so that the motorcycle can be parked, and a motorcycle. A side stand 27 that can be rotated between the retracted position (the position shown in FIG. 1) separated from the road surface is attached. A main stand 22 that can be rotated between an upright position and a retracted position is attached to the front lower portion of the power unit P.

  Referring also to FIG. 5, the fuel tank 28 is located below the step floor 25 in a region surrounded by the main pipe 14, both lower frames 15... And the cross pipe 16 in the vehicle body frame FA. The fuel tank 28 is supported by the lower frames 15 at a plurality of locations spaced apart in the circumferential direction. A pump unit 29 for supplying the fuel in the fuel tank 28 to the engine E is disposed at the rear of the fuel tank 28.

  Referring also to FIG. 6, a fuel passage 30 is formed in at least a part of the main pipe 14, and a lower portion of the fuel supply pipe 31 for supplying fuel to the fuel passage 30 is a main portion. The upper end opening of the oil supply pipe 31 is closed by a cap 33 that can be opened and closed. Thus, the fuel supplied from the fuel supply pipe 31 to the fuel passage 30 is guided to the fuel tank 28 via a rubber lower connection pipe 34 having flexibility and connected to the lower portion of the main pipe 14. It is burned.

  Incidentally, the lower portion of the main pipe 14 is closed by a plug 35 that defines the lower end position of the fuel passage 30 at a position spaced upward from the lower end of the main pipe 14, and the main pipe 14 is positioned lower than the plug 35. The front ends of the lower frames 15 are welded to each other.

  Thus, the inner ends of the laterally extending portions 15a of the pair of left and right lower frames 15 are welded to the left and right sides of the main pipe 14 at a position lower than the plug 35. Between the front portion, that is, the side extension portion 15a, and the main pipe 14, a pair of left and right reinforcements whose projections onto a plane orthogonal to the axis of the side extension portion 15a are substantially U-shaped and open downward. Members 36 are provided. Further, a cross member 37 that passes through the lower front of the main pipe 14 in a side view is provided between the front portions of the lower frames 15.

  A first short pipe 38 that opens to the fuel passage 30 at a position higher than the plug 35 is welded to the lower rear surface of the main pipe 14 between both the reinforcing members 36, 36. One end of the lower connection pipe 34 is connected to the first and second connections. On the upper surface of the fuel tank 28, a recess 28a opened upward and leftward is formed at a position shifted to the left from the vertical plane PL passing through the axis of the head pipe 13 and the main pipe 14. Thus, the second short pipe 39 is welded to the bottom surface of the recess 28a of the upper surface of the fuel tank 28 so as to protrude upward, and the other end of the lower connecting pipe 34 is connected to the first short pipe 38. It is connected to the second short tube 39 at a lower position.

  That is, the other end of the lower connection pipe 34, one end of which is connected to the main pipe 14 so as to communicate with the fuel passage 30 above the plug 35, is connected to the main pipe 14 of the lower connection pipe 34. It is connected to the upper surface of the fuel tank 28 below the portion. In addition, the second short pipe 39 provided on the fuel tank 28 at the other end of the lower connection pipe 34 is connected to the main pipe 14 at the end of the lower connection pipe 34. In this embodiment, the first short pipe 38 is offset to the left or right side. In this embodiment, the first short pipe 38 is offset to the side of the side stand 27 on the left side of the vehicle body frame FA. The connection pipe 34 is bent and arranged in plan view.

  By the way, the oil supply pipe 31 is arranged to be deviated to the left and right sides with respect to the axis of the main pipe 14. In this embodiment, the oil supply pipe 31 is arranged to be deviated to the left with respect to the axis of the main pipe 14. The attachment member 40 fixed to the oil supply pipe 31 is attached to the left side surface of the main pipe 14. Moreover, the oil supply pipe 31 is supported by the main pipe 14 such that the upper end thereof is disposed above the upper end of the head pipe 13.

  Thus, one end of the flexible upper connecting pipe 32 is connected to the lower part of the oil supply pipe 31 and is provided on the left side surface of the middle part in the vertical direction of the main pipe 14 so as to communicate with the fuel passage 30. The other end of the upper connecting pipe 32 is connected to the third short pipe 45.

  A brake cable 41 and an accelerator cable 42 are connected to the main pipe 14 on the side where the oil supply pipe 31 is arranged with respect to the vertical plane PL including the axes of the head pipe 13 and the main pipe 14, that is, on the left side of the vertical plane PL. A main switch 43 is arranged on the opposite side of the vertical plane PL from the oil supply pipe 31, the brake cable 41 and the accelerator cable 42, and a wire harness 44 is routed along the main pipe 14. Is done.

  Incidentally, a side stand 27 (see FIG. 1) is disposed on the left side of the vehicle body frame FA, and is opposite to the side on which the side stand 27 is disposed with respect to the vertical plane PL including the axes of the head pipe 13 and the main pipe 14. On the right side, the upper surface of the fuel tank 28 is provided with a fourth short pipe 47 that forms a tank-side air vent 46, and one end is connected to the fourth short pipe 47 so as to communicate with the tank-side air vent 46. The other end of the breather tube 48 is connected to the oil supply pipe 31, and this breather tube 48 is routed along the main pipe 14 on the side where the oil supply pipe 31 is arranged with respect to the vertical plane PL. Is done.

  On the other hand, a main pipe side air vent 50 (see FIG. 3) is provided above the connecting portion of the oil supply pipe 31 to the main pipe 14, that is, above the connection position of the third short pipe 45 to the main pipe 14. And a main pipe side air vent port 50 is connected to the oil supply pipe 31 via a rubber hose 52.

  Thus, the upper end of the oil supply pipe 31 is disposed above the upper end of the head pipe 13, and the rubber hose 52 is connected to the oil supply pipe 31 above the upper end of the head pipe 13. Moreover, the oil supply pipe 31 is disposed on the left side of the vertical plane PL including the axis of the head pipe 13 and the main pipe 14, and the rubber hose 52 is connected to the oil supply pipe 31 near the vertical plane PL.

  By the way, the breather tube 48, one end of which leads to the tank side air vent 46 of the fuel tank 28, has a bent portion 48a that is bent so as to bulge upward above the front side of the fuel supply pipe 31, and has a larger diameter than the rubber hose 52. In the vicinity of the oil supply pipe 31, it is routed so as to pass through a region surrounded by the main pipe 14, the oil supply pipe 31 and the rubber hose 52. Moreover, the other end of the breather tube 48 is connected to the upper surface of the oil supply pipe 31 below the connecting portion of the rubber hose 52 to the oil supply pipe 31.

  A sixth short pipe 54 that forms a fuel discharge port 53 for discharging the overflow fuel from the oil supply pipe 31 is substantially the same height as the connection portion of the rubber hose 52 to the oil supply pipe 31. One end of an overflow tube 55 that is provided and communicates with the fuel discharge port 53 is connected to the sixth short tube 54. Moreover, the overflow tube 55 is routed so as to extend downward through the inside of the bent portion 48 a of the breather tube 48.

  Next, the operation of the first embodiment will be described. The lower portion of the main pipe 14 is closed with a plug 35 that defines the lower end position of the fuel passage 30 at a position spaced upward from the lower end of the main pipe 14 in the vehicle body frame FA. Since the front end of the lower frame 15 is welded to the main pipe 14 at a position lower than the plug 35, the lower frame 15 to the main pipe 14 is welded to a portion of the inner surface of the main pipe 14 exposed to the fuel. The main pipe 14 can be made as thick as a main pipe that does not use the inside as a fuel passage, and the weight and cost of the vehicle body frame FA can be reduced. Reduction can be achieved.

  In addition, one end of the flexible lower connecting pipe 34 is connected to the main pipe 14 so as to communicate with the fuel passage 30, and the other end of the lower connecting pipe 34 is connected to the fuel tank 28. The degree of freedom of the shape and arrangement of the fuel tank 28 can be increased, and the fuel tank 28 can be easily detached from the main pipe 14, so that maintainability can be improved.

  In addition, the other end of the lower connection pipe 34 whose one end is connected to the main pipe 14 so as to communicate with the fuel passage 30 at a position above the plug 35 is connected to the upper surface of the fuel tank 28. Even if the motorcycle is frequently started and stopped when the amount of stored fuel becomes small, the forward and backward movement of fuel in the fuel tank 28 is restricted by the front wall and the rear wall of the fuel tank 28. In addition, when the motorcycle is started and stopped frequently, the fuel in the fuel tank 28 is prevented from moving toward the fuel passage 30 in the main pipe 14, and the weight balance between the front and rear of the motorcycle is suppressed. At the same time, it is possible to accurately grasp the remaining amount of fuel. Further, in the fuel passage 30 in the main pipe 14, a portion between the plug 35 at the lower part of the main pipe 14 and the connection portion to the main pipe 14 at one end of the lower connection pipe 34 can be used as a reservoir portion. It is possible to suppress the entry of foreign matter into the fuel tank 28 by collecting foreign matter that has entered the passage 30 in the reservoir.

  Further, the lower connecting pipe 34 is viewed in a plan view so that the connecting portion of the lower connecting pipe 34 to the fuel tank 28 is offset to the left with respect to the connecting portion of the lower connecting pipe 34 to the main pipe 14. Since it is arranged to be bent, the movement of the fuel from the fuel tank 28 to the fuel passage 30 in the main pipe 14 can be more effectively suppressed, and the lower connecting pipe 34 is arranged on the side where the side stand 27 is arranged. Since it is bent, the fuel can be smoothly and reasonably injected into the fuel tank 28 from the oil supply passage 30 when refueling in the parking state with the side stand 27 upright.

  Further, the front ends of the pair of left and right lower frames 15 are welded to both sides of the main pipe 14 at a position lower than the plug 35, and the pair of left and right pairs between the front portions of the lower frames 15 and the main pipe 14 are welded. Since the reinforcing members 36 are provided, the front portions of the lower frames 15 and the joint portion of the main pipe 14 are reinforced by the reinforcing members 36 that are less affected by welding than the lower frames 15. The coupling strength of the main pipe 14 and the lower frames 15 can be increased while suppressing the influence of welding on the fuel passage 30.

  One end of the lower connecting pipe 34 is connected to the rear surface of the main pipe 14 between the two reinforcing members 36... And the lower connecting pipe 34 can be reinforced by the reinforcing members 36. It is possible to connect to the main pipe 14 at a portion that does not affect the arrangement of the main pipe 14.

In addition, a cross member 37 that passes through the lower front of the main pipe 14 in a side view is provided between the front portions of the lower frames 15..., So that the coupling strength of the pair of left and right lower frames 15. While raising with the member 37, the lower part of the main pipe 14 which forms the fuel passage 30 can be protected from the front by the cross member 37.
It is characterized by that.

  In addition, since the oil supply pipe 31 for supplying fuel to the fuel passage 30 in the main pipe 14 is connected to the main pipe 14 via the flexible upper connection pipe 32, the degree of freedom in the arrangement of the oil supply pipe 31. In addition, the oil supply pipe 31 can be easily detached from the main pipe 14 and the maintainability can be improved.

  Moreover, since the oil supply pipe 31 is arranged to be deviated to the left with respect to the axis of the main pipe 14, the oil supply pipe 31 is arranged at a position not overlapping the main pipe 31 in the rear view. It is possible to reduce the size of the motorcycle by suppressing the rearward projection of the vehicle 31 and suppressing the interference with the occupant.

  In addition, the brake cable 41 and the accelerator cable 42 are routed along the main pipe 14 on the side where the oil supply pipe 31 is arranged with respect to the vertical plane PL including the axes of the head pipe 13 and the main pipe 14. Since the main switch 43 is disposed on the side opposite to the oil supply pipe 31, the brake cable 41 and the accelerator cable 42 (on the right side of the vertical plane PL), the wire harness 44 is routed along the main pipe 14. An efficient layout that is not affected by the fuel becomes possible.

  By the way, a side stand 27 is disposed on the left side of the vehicle body frame FA, and a tank side air vent 46 is provided on the upper surface of the fuel tank 27 on the opposite side of the vertical plane PL from the side on which the side stand 27 is disposed. Since the other end of the breather tube 48, one end of which is connected to the air vent 46, is connected to the oil supply pipe 31, the air in the fuel tank 28 is surely extracted when refueling in the parking state with the side stand 27 set up. The fuel can be reliably supplied into the fuel tank 28.

  Further, a main pipe side air vent 50 is provided in the main pipe 14 above the connection portion of the oil pipe 31 to the main pipe 14, and the air in the main pipe 14 is supplied to the main pipe side air vent 50 during refueling. As a result, the fuel can be smoothly injected into the main pipe 14 and, as a result, the fuel supply efficiency can be improved and more fuel can be supplied quickly.

  Moreover, the main pipe-side air vent 50 is connected to the oil supply pipe 31 via a rubber hose 52. When the fuel begins to fill the lower part of the main pipe 14 during refueling, the fuel in the form of mist together with the air inside the rubber hose It is discharged to the oil supply pipe 31 side through 52. Then, the refueling gun inserted into the refueling pipe 31 is exposed to the mist-like air containing the fuel, and it becomes possible to act on the automatic stop sensor and stop automatically to stop the fuel supply. The fuel supply can be stopped in a state where an appropriate amount of fuel is supplied.

  An oil supply pipe 31 is connected to the main pipe 14 with its upper end positioned above the upper end of the head pipe 13, and a rubber hose 52 is connected to the oil supply pipe 31 above the upper end of the head pipe 13. Since the connection is made, the fuel can be stored up to the upper position in the main pipe 14 while discharging the air in the main pipe 14 well.

  The oil supply pipe 31 is disposed on the left side of the vertical plane PL including the axis of the head pipe 13 and the main pipe 14 and is connected to the main pipe 14 via an upper connection pipe 32 having flexibility. Since the rubber hose 52 is connected to the oil supply pipe 31 close to the vertical plane PL, the main pipe side air vent 50 and the oil supply pipe 31 can be connected by the shortest rubber hose 52.

  By the way, the breather tube 48 has a bent portion 48 a that is bent so as to bulge upward above the fuel supply pipe 31, and has a larger diameter than the rubber hose 52. One end of the breather tube 48 is inside the fuel tank 28. The other end of the breather tube 48 is connected to the upper surface of the oil supply pipe 32 below the connecting portion of the rubber hose 52 to the oil supply pipe 31. Therefore, the air in the fuel tank 28 having a larger amount of air than in the main pipe 14 can be discharged well by the large-diameter breather tube 48 to increase the fuel injection efficiency into the fuel tank 28. Is introduced into the oil supply pipe 31 above the oil supply gun inserted in the oil supply pipe 31, making it difficult to operate the automatic stop sensor, In its can be difficult stopped automatically, it is possible to enhance the working efficiency at the time of refueling.

  In addition, since the breather tube 48 is routed so as to pass through a region surrounded by the main pipe 14, the oil supply pipe 31 and the rubber hose 52, the breather tube 48 is surrounded by the main pipe 14, the oil supply pipe 31 and the rubber hose 52. In addition, the breather tube 48 can be effectively disposed in a space surrounded by the main pipe 14, the oil supply pipe 31, and the rubber hose 52, thereby preventing the breather tube 48 from being entangled with the rubber hose 52.

  Further, since the breather tube 48 is routed along the main pipe 14 on the side where the fuel supply pipe 31 is arranged with respect to the vertical plane PL including the axes of the head pipe 13 and the main pipe 14, the fuel system is arranged on the left and right sides of the main pipe 14. Maintainability can be improved by arranging them together on one side.

  Incidentally, a fuel discharge port 53 for discharging the overflow fuel from the fuel supply pipe 31 is provided in the fuel supply pipe 31 at substantially the same height as the connection portion of the rubber hose 52 to the fuel supply pipe 32, and the fuel discharge port 53. Since the overflow tube 55 is connected to the fuel pipe 32, the overflow mechanism can be disposed in the oil supply pipe 32 with less influence from the rubber hose 52 and the breather tube 48, and the overflow function can be reliably exhibited. .

  Further, since the overflow tube 55 is routed so as to pass through the inside of the bent portion 48a of the breather tube 48, the overflow tube 55 is placed in an empty space in the bent portion 48a of the breather tube 48 so as not to be entangled with the breather tube 48. Can be routed.

  Further, a main switch 43 is arranged on the right side of the main pipe 14, and the oil supply pipe 31 is arranged on the left side of the main pipe 14 and connected to the left side surface of the main pipe 14, so that the layout of the main switch 43 or The oil supply pipe 31 can be arranged at a position where the operation is not affected, and the oil supply work efficiency can be improved.

  FIG. 7 shows a second embodiment of the present invention. Parts corresponding to the first embodiment are given the same reference numerals, and detailed description thereof is omitted.

  The body frame FB of the motorcycle of the scooter type includes a head pipe 13 that supports the front fork 11 and the steering handle 12 so as to be steerable, a hollow main pipe 14 that extends rearwardly downward from the head pipe 13, A pair of left and right lower frames 15 that are coupled to the lower part of the pipe 14 and extend rearward, a cross pipe 16 that connects the rear ends of the lower frames 15, and front ends that are connected to both ends of the cross pipe 16 respectively. And a pair of left and right rear frame pipes 17 and an intermediate portion of the main pipe 14 and an upper frame 58 connecting the intermediate portions of the two rear frame pipes 17.

  In the vehicle body frame FB, a fuel tank 28 is disposed in a region surrounded by the main pipe 14, both lower frames 15 ... and the cross pipe 16, and a plurality of locations spaced in the circumferential direction of the fuel tank 28 are described above. It is supported by both lower frames 15. A pump unit 29 for supplying the fuel in the fuel tank 28 to the engine E of the power unit P is disposed at the rear of the fuel tank 28. The fuel supply structure to the fuel tank 28 is configured in the same manner as in the first embodiment.

  A part of the engine E and the vehicle body frame FB are provided between the passenger seat 24 and the head pipe 13 between a pair of left and right step floors 59 for placing the passenger's feet on the passenger seat 24 and both step floors 59. The floor tunnel portion 60 is supported by a pair of left and right upper frames 58...

  Further, a storage box 62 extending from below the passenger seat 24 to the floor tunnel portion 60 is disposed in the vehicle body cover 61, and a front portion of the storage box 62 is disposed above the fuel tank 28.

  The same effects as those of the first embodiment can be obtained by the second embodiment.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. It is.

1 is a left side view of a scooter type motorcycle according to a first embodiment. It is a left view of a vehicle body frame and a fuel tank. FIG. 3 is an enlarged view of a main part of FIG. 2. FIG. 4 is a view taken in the direction of arrow 4 in FIG. 3. It is a perspective view of a part of body frame and a fuel tank. It is a longitudinal cross-sectional view which shows the front part of a fuel tank, and the lower part of a main pipe. It is a left view of the scooter type motorcycle of the second embodiment.

DESCRIPTION OF SYMBOLS 11 ... Front fork 12 ... Steering handle 13 ... Head pipe 14 ... Main pipe 27 ... Side stand 28 ... Fuel tank 30 ... Fuel passage 31 ... Refueling pipe 32 .... Upper connection pipe 34 ... Lower connection pipe 35 ... Plug 42 as a blocking member ... Accelerator cable 43 ... Main switch 44 ... Wire harness 46 ... Air vent 48 ... Air vent Breather tubes FA, FB ... body frame PL ... vertical surface

Claims (9)

  The body frame (FA, FB) has a head pipe (13) that supports the steering handle (12) and the front fork (11) so as to be capable of steering, and extends rearwardly downward from the head pipe (13) and at least partially. And a hollow main pipe (14) forming a fuel passage (30), and a fuel supply pipe (31) for supplying fuel to the fuel passage (30) is connected to the main pipe (14), In a small vehicle in which a fuel tank (28) that is refueled from a refueling pipe (31) through the fuel passage (30) is connected to a lower portion of the main pipe (14), the lower portion of the main pipe (14) is the fuel. One end of a flexible lower connecting pipe (34) is closed by a closing member (35) that defines a lower end position of the passage (30), and communicates with the fuel passage (30). A small size characterized in that it is connected to the side surface of the main pipe (14) at a position above the closing member (35), and the other end of the lower connection pipe (34) is connected to the fuel tank (28). Fuel supply structure for vehicles.   The other end of the lower connecting pipe (34) is connected to the upper surface of the fuel tank (28) below the connecting portion of the lower connecting pipe (34) to the main pipe (14). The fuel supply structure for a small vehicle according to claim 1.   The connection part of the other end of the lower connection pipe (34) to the fuel tank (28) is either left or right with respect to the connection part of the one end of the lower connection pipe (34) to the main pipe (14). The fuel supply structure for a small vehicle according to claim 1 or 2, wherein the lower connecting pipe (34) is bent and arranged in a plan view so as to be offset.   Side stands (27) are arranged on the left and right sides of the vehicle body frame (FA, FB), and the connecting portion of the lower connecting pipe (34) to the fuel tank (28) is the main of the lower connecting pipe (34). The fuel supply structure for a small vehicle according to claim 3, wherein the fuel supply structure for the small vehicle is arranged offset to a side where the side stand (27) is arranged with respect to a connection portion to the pipe (14). One end of the connecting tube on having flexible (32) is connected to the oil supply pipe (31), the other end of the upper connecting pipe (32) so as to communicate with the fuel passage (30) the main pipe ( 14) The fuel refueling structure in a small vehicle according to any one of claims 1 to 4, wherein the fuel refueling structure is connected to 14).   The fuel supply in the small vehicle according to any one of claims 1 to 5, wherein the oil supply pipe (31) is arranged to be deviated to the left and right sides with respect to the axis of the main pipe (14). Construction.   An accelerator cable (42) is routed along the main pipe (14) on the side where the oil supply pipe (31) is arranged with respect to the vertical plane (PL) including the axis of the main pipe (14), and the vertical plane (PL), a main switch (43) is disposed on the opposite side of the oil supply pipe (31) and the accelerator cable (42), and a wire harness (44) is routed along the main pipe (14). The fuel supply structure for a small vehicle according to claim 6.   A side stand (27) is disposed on the left and right sides of the vehicle body frame (FA, FB), and the side opposite to the side on which the side stand (27) is disposed with respect to the vertical plane (PL) including the axis of the main pipe (14). An air vent (46) is provided on the upper surface of the fuel tank (28), and the other end of the air vent conduit (48) having one end connected to the air vent (46) is connected to the fuel supply pipe (31). A fuel supply structure for a small vehicle according to any one of claims 1 to 7, wherein   The air vent conduit (48) is routed along the main pipe (14) on the side where the oil supply pipe (31) is disposed with respect to the vertical plane (PL) including the axis of the main pipe (14). The fuel supply structure for a small vehicle according to claim 8.

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