JP2013133003A - Fuel supplying structure in saddle type vehicle - Google Patents

Abstract

A fuel tank having a pair of left and right hanging parts arranged on both sides of a frame member constituting a part of a vehicle body frame and extending in the front-rear direction is arranged so as to straddle the frame member from above, and fuel from the fuel tank In the saddle-ride type vehicle in which the fuel pump that sucks in the fuel is disposed below the both hanging parts, the vapor returned from the fuel pump to the fuel tank is not supplied again to the fuel pump side.
A fuel pump unit 46 including a fuel pump 48 and a pump case 49 in which the fuel pump 48 is accommodated is arranged below a frame member 13 so that a central axis CP of the fuel pump 48 extends along the vehicle width direction. The fuel supply pipe 55 for guiding the fuel to the fuel pump 48 is connected to one of the left and right hanging parts 47a and 47b, and the surplus fuel including the vapor generated in the fuel pump unit 46 is returned to the fuel tank 47 side. A pipe line 57 is connected to the other of the left and right hanging parts 47a and 47b.
[Selection] Figure 3

Description

  According to the present invention, a fuel tank having a pair of left and right hanging parts disposed on both sides of a frame member that constitutes a part of a vehicle body frame and extends in the front-rear direction is disposed so as to straddle the frame member from above, and the fuel tank More particularly, the present invention relates to an improvement in a fuel supply structure between a fuel tank and a fuel pump.

  Patent Document 1 discloses an arrangement structure of a fuel hose for improving fuel supply from a hanging portion provided on the left and right of a fuel tank mounted on a saddle-ride type vehicle to a carburetor disposed below the hanging portion. And already known from US Pat.

JP 2005-105987 A JP 2008-143317 A

  Patent Document 1 and Patent Document 2 both disclose a structure in which a fuel injection valve is attached to a throttle body. Further, in Patent Document 1, a fuel pump is assembled to a throttle body to which a fuel injection valve is attached. Thus, the fuel injection valve and the fuel pump are integrated in a compact manner. In such a case, it is necessary to return the vapor from the fuel pump to the fuel tank, but it is necessary to prevent the vapor returned to the fuel tank from being mixed into the fuel supplied from the fuel tank to the fuel pump.

  The present invention has been made in view of such circumstances, and provides a fuel supply structure in a saddle-ride type vehicle in which the vapor returned from the fuel pump to the fuel tank is not supplied again to the fuel pump side. The purpose is to do.

  In order to achieve the above object, the present invention provides a fuel tank having a pair of left and right hanging parts arranged on both sides of a frame member that constitutes a part of a body frame and extends in the front-rear direction, straddling the frame member from above. In a saddle-ride type vehicle in which a fuel pump that sucks fuel from the fuel tank is disposed below the both hanging parts, the fuel pump and a pump case that houses the fuel pump are included. A fuel pump unit is disposed below the frame member so that a central axis of the fuel pump is along the vehicle width direction, and fuel supply pipes for guiding fuel from the fuel tank to the fuel pump The surplus fuel connected to one of the parts and including the vapor generated in the fuel pump unit is returned from the fuel pump unit to the fuel tank side. And conduit to the first being connected to the other of the hanging parts of the left and right.

  According to the present invention, a fuel tank having a pair of left and right hanging parts disposed on both sides of a frame member that constitutes a part of a vehicle body frame and extends in the front-rear direction is disposed so as to straddle the frame member from above. In a saddle-ride type vehicle in which a fuel pump for sucking fuel from a tank is disposed below the both hanging parts, a fuel pump unit including the fuel pump and a pump case for housing the fuel pump includes the fuel pump. A fuel supply line that is arranged below the frame member so that the center axis of the pump is along the vehicle width direction and guides fuel from the fuel tank to the fuel pump is connected to the left and right hanging parts, respectively. Return pipes for returning surplus fuel including vapor generated in the fuel pump unit from the fuel pump unit to the fuel tank are provided on the left and right front sides. And the fuel supply line connections to one of the downwardly extending portion is a second being connected to one of the hanging portion at a position separated back and forth.

  In addition to the configuration of the first feature, the present invention has a third feature in that the fuel supply pipe is connected to two places separated from one another before and after one of the left and right hanging parts.

  According to the present invention, in addition to any one of the first to third features, the return position of the surplus fuel from the return pipe to the fuel tank is set in the fuel tank to the fuel supply pipe. The fourth feature is that the fuel supply position is set higher than the fuel supply position from the first position.

  According to the present invention, in addition to the configuration of the fourth feature, an engine body having a forward tilted cylinder portion is mounted on a vehicle body frame so as to be disposed below the frame member, and is disposed behind the cylinder portion. A fifth feature is that the pump case is coupled to a body of a throttle body disposed between the air cleaner and the cylinder portion.

  The main frame 13 of the embodiment corresponds to the frame member of the present invention.

  According to the first aspect of the present invention, the fuel supply conduit for guiding the fuel from the fuel tank to the fuel pump is connected to one of the left and right hanging parts of the fuel tank, and the surplus fuel including the vapor is returned to the fuel tank side. Since the pipe line is connected to the other of the left and right hanging parts, the pipe length can be shortened, and the vapor returned from the fuel pump side in the fuel tank is mixed into the fuel supplied to the fuel pump side. This can be prevented.

  According to the second aspect of the present invention, the fuel supply conduits for guiding the fuel from the fuel tank to the fuel pump are connected to the left and right hanging portions of the fuel tank, respectively, so that the saddle-ride type vehicle is positioned in the left-right direction. Regardless of changes, fuel can be supplied efficiently from the fuel tank to the fuel pump, and a return line that returns the surplus fuel including vapor to the fuel tank is connected to one of the left and right hanging parts. Is connected to one hanging part at a position spaced apart from the front and rear, so that the pipe length can be shortened, and the vapor returned from the fuel pump side in one hanging part is supplied to the fuel pump side. Can be prevented from being mixed into the fuel.

  According to the third aspect of the present invention, since the fuel supply pipe is connected to two places separated from one another in the front and rear of the left and right hanging parts, the fuel is supplied regardless of the posture change in the front-rear direction of the saddle-ride type vehicle. Fuel can be effectively supplied from the tank to the fuel pump.

  According to the fourth aspect of the present invention, the surplus fuel is returned from the return pipe into the fuel tank at a position higher than the fuel supply position from the fuel tank to the fuel supply pipe, and thus returned to the fuel tank. Further, the vapor in the surplus fuel is less likely to be mixed into the lower fuel supply line side due to the buoyancy, and it is possible to more reliably prevent the vapor from being mixed into the fuel sucked by the fuel pump.

  Further, according to the fifth aspect of the present invention, the throttle body is disposed between the cylinder portion and the air cleaner disposed behind the cylinder portion of the engine body disposed below the frame member, and the throttle body. Since the pump case housing the fuel pump is coupled to the body of the fuel pump, the fuel pump can be disposed at a relatively high position by utilizing the space around the intake device, and even in this case, the fuel pump sucks into the fuel sucked The engine performance can be improved by preventing the vapor from entering.

1 is a side view of a motorcycle according to a first embodiment. It is a principal part enlarged view of FIG. FIG. 3 is a view showing a relative arrangement of a throttle device including a fuel pump unit and a fuel tank as viewed from a direction along line 3-3 in FIG. 2. It is a side view corresponding to FIG. 2 of 2nd Embodiment. It is a figure which shows the relative arrangement | positioning of the throttle apparatus containing a fuel pump unit, and a fuel tank seen from the direction in alignment with line 5-5 in FIG. It is a side view corresponding to FIG. 2 of 3rd Embodiment.

  Embodiments of the present invention will be described with reference to the accompanying drawings.

  A first embodiment of the present invention will be described with reference to FIGS. 1 to 3. First, in FIG. 1, a body frame F of a motorcycle, which is a saddle-ride type vehicle, is a front fork 11 that pivotally supports a front wheel WF. A head pipe 12 that can be steered, a single main frame 13 that is inclined rearwardly downward from the head pipe 12, a pivot plate 14 provided at a rear end of the main frame 13, and the main frame 13 A pair of left and right seat rails 15 that extend rearward with the front end joined to the middle portion of the main frame 13 and the front end joined to the head pipe 12 below the connecting portion of the front end of the main frame 13 to the head pipe 12. A single down frame 16 extending downward and a sub-pie connecting between the intermediate portion of the main frame 13 and the down frame 16. 17, includes a pair of left and right reinforcing frames 18 ... and connecting the said pivot plate 14 and the both seat rails 15 ..., and the backbone format.

  The main frame 13 is integrally formed with a main frame front portion 13a that gently slopes downward from the head pipe 12 and a main frame rear portion 13b that sharply slopes backward from the rear end of the main frame front portion 13a. The pivot frame 14 is provided at a rear end portion, that is, a lower end portion of the main frame rear portion 13b, and a front end of the seat rail 15 is a connecting portion of the main frame front portion 13a and the main frame rear portion 13b. The sub-pipe 17 is provided between an intermediate portion of the main frame front portion 13 a and the down frame 15.

  Referring also to FIG. 2, an engine body 21 of a single cylinder engine includes a crankcase 23, a cylinder body 24, a cylinder head 25, and a head cover 26 that support a crankshaft 22 having an axis line arranged in the width direction of the motorcycle. The cylinder body 24, the cylinder head 25, and the head cover 26 constitute a cylinder portion 20 having a cylinder axis C tilted forward.

  The engine body 21 is disposed below the main frame 13 that is a frame member that constitutes a part of the body frame F and extends in the front-rear direction, and in a space surrounded by the main frame 13, the pivot plate 14, and the down frame 16. The In addition, two upper and lower portions of the front portion of the crankcase 23 are supported by a support bracket 27 attached to the lower end portion of the down frame 16, and two upper and lower portions of the rear portion of the crankcase 23 are supported by the pivot plate 14.

  A transmission (not shown) for shifting the rotational power of the crankshaft 22 is accommodated in the crankcase 23, and one end of the output shaft 28 of the transmission is located behind the crankshaft 22. It protrudes outward from the crankcase 23. Moreover, an endless chain 31 is wound around a driving sprocket 29 fixed to the protruding end of the output shaft 28 and a driven sprocket 30 provided on the rear wheel WR.

  The rear wheel WR is rotatably supported at the rear end portion of the swing arm 32, and the front end portion of the swing arm 32 is around the axis of the connecting shaft 33 that connects the reinforcing frame 18 to the pivot plate 14. It is supported by the pivot plate 14 so that it can swing. Further, a rear cushion unit 34 is provided between a portion where the reinforcing frames 18 are connected to the seat rails 15 and a rear portion of the swing arm 32.

  An upstream end of an exhaust pipe 35 is connected to the front side wall of the cylinder head 25 in the cylinder portion 20, and the exhaust pipe 35 extends from the front of the engine body 21 to the lower side of the crankcase 23 and extends rearward. The downstream end of the exhaust pipe 35 is connected to an exhaust muffler 36 that is discharged and disposed on the right side of the rear wheel WR.

  An intake device 37 is connected to the rear side wall of the cylinder head 25 in the cylinder portion 20 of the engine body 21. The intake device 37 includes an air cleaner 38 disposed behind the cylinder portion 20, an intake pipe 39 having an upstream end connected to an outlet pipe 38 a provided in the air cleaner 38, and the intake pipe 39 and the cylinder head 25. And a throttle device 40 interposed between the rear side walls.

  Referring also to FIG. 3, the throttle device 40 is configured such that a throttle valve 43 is disposed in a body 42 having an intake passage 41 and is disposed between the cylinder portion 20 of the engine body 21 and the air cleaner 38. A throttle body 44, a fuel injection valve 45 attached to the upper portion of the body 42 so as to inject fuel into the intake passage 41, and a fuel pump unit 46 attached to the body 42 are provided.

  In the vehicle body frame F, a fuel tank 47 having a pair of left and right hanging parts 47a and 47b disposed on both sides of the main frame front part 13a in the main frame 13 straddles the main frame front part 13a from above. Installed.

  The fuel pump unit 46 includes a fuel pump 48 for supplying the fuel sucked from the fuel tank 49 to the fuel injection valve 45, and a pump case 49 that houses the fuel pump 48 and is coupled to the body 42. In this embodiment, the fuel pump unit 46 is configured by the fuel pump 48 and the pump case 49, and the control unit 51 for controlling the operation of the fuel pump 48 is accommodated. A control box 50 is provided on the right side of the body 42.

  The fuel pump unit 46 is disposed below the main frame 13 in the vehicle body frame F so that the central axis CP of the fuel pump 48 is along the vehicle width direction. In this embodiment, the pump As the case 49 crosses the pump axis CP of the fuel pump 48 obliquely with a vertical plane PL including the center line of the intake passage 41 in the throttle body 44 and moves away from the coupling portion of the pump case 49 to the body 42. It is attached to the lower right side of the body 42 so as to be in the lower position.

  The fuel from the fuel tank 47 is guided into the pump case 49 and is sucked into the fuel pump 48 in the pump case 49, and a suction connection pipe 52 is provided at the upper part of the left end portion of the pump case 49. It is provided so as to protrude upward. The body 42 is formed with a fuel passage 53 that guides fuel discharged from the fuel pump 48 to the fuel injection valve 45. A return connection pipe 54 protruding upward is provided on the upper right side of the body 42 so as to communicate with the uppermost part in the pump case 49.

  One end of a fuel supply line 55 for guiding fuel from the fuel tank 47 is connected to the suction connection pipe 52, and the other end of the fuel supply line 55 is connected to the fuel tank. One of the left and right hanging parts 47a, 47b provided in 47 is connected to a first tank side connecting pipe 56 provided in the lower part of the hanging part 47a in this embodiment. The return connecting pipe 54 is connected to one end of a return pipe 57 for returning surplus fuel including vapor generated in the fuel pump unit 46 from the fuel pump unit 46 to the fuel tank 47 side. The other end of the return pipe 57 is connected to a second tank side connection pipe 58 provided at the lower part of the other 47b of the left and right hanging parts 47a, 47b.

  That is, a fuel supply line 55 for guiding fuel from the fuel tank 47 to the fuel pump 48 is connected to the hanging portion 47 a of the fuel tank 47, and surplus fuel including vapor generated in the fuel pump unit 46 is transferred from the fuel pump unit 46 to the fuel tank 47. The return line 57 returning to the side is connected to the hanging part 47 b of the fuel tank 47.

  In addition, the upper end of the second tank side connecting pipe 58 is higher than the upper end of the first tank side connecting pipe 56, and the return position of the surplus fuel from the return pipe 57 into the fuel tank 47 is the fuel supply pipe. 55 is set higher than the fuel supply position from within the fuel tank 47.

  Next, the operation of the first embodiment will be described. A fuel pump unit 46 including a fuel pump 48 and a pump case 49 in which the fuel pump 48 is accommodated has a center axis CP of the fuel pump 48 defined by a vehicle width. The fuel tank 47 is disposed below the main frame 13 in the vehicle body frame F so as to extend in the direction and has drooping portions 47 a and 47 b disposed on both sides of the main frame 13. A fuel supply line 55 for guiding fuel to the pump 48 is connected to one of the left and right hanging portions 47a and 47b, and surplus fuel including vapor generated in the fuel pump unit 46 is transferred from the fuel pump unit 46 to the fuel tank 47. Since the return pipe 57 returning to the side is connected to the other 47b of the left and right hanging parts 47a, 47b It is possible to shorten the piping length can be vapor returned from the fuel pump 48 side in the fuel tank 47 is prevented from entering the fuel supplied to the fuel pump 48 side.

  Moreover, since the return position of the surplus fuel from the return pipe 57 into the fuel tank 47 is set higher than the fuel supply position from the fuel tank 47 to the fuel supply pipe 55, the fuel tank The vapor in the surplus fuel returned into the fuel 47 is less likely to be mixed into the lower fuel supply line 55 due to the buoyancy, and the fuel can be more reliably prevented from being mixed into the fuel sucked by the fuel pump 48. .

  An engine body 21 having a forwardly inclined cylinder portion 20 is mounted on the vehicle body frame F so as to be disposed below the main frame 13, and an air cleaner 38 and the cylinder portion 20 are disposed behind the cylinder portion 20. Since the pump case 49 is coupled to the body 42 of the throttle body 44 disposed therebetween, the fuel pump 48 can be disposed at a relatively high position using the space around the intake device 37. However, it is possible to improve the performance of the engine by preventing vapor from being mixed into the fuel sucked by the fuel pump 48.

  The second embodiment of the present invention will be described with reference to FIG. 4 and FIG. 5, but the parts corresponding to the first embodiment are only given the same reference numerals and shown in detail. The detailed explanation is omitted.

  A suction connection pipe 52 provided at the upper part of the left end of the pump case 49 of the fuel pump unit 46 provided in the throttle device 40 is connected to one end of the fuel supply pipe 71 so as to communicate with the uppermost part in the pump case 49. One end of a return pipe 72 is connected to the return connection pipe 54 provided on the body 42 of the throttle body 44.

  First tank side connecting pipes 56, 56 are provided at the lower part of the rear part of the left and right hanging parts 47a, 47b in the fuel tank 47, and one of the hanging parts 47a, 47b (in this third embodiment, the hanging part). A second tank side connection pipe 58 is provided at the lower part of the front part of the portion 47b) so that the upper end is disposed at a position higher than the upper ends of the first tank side connection pipes 56.

  One end of a fuel supply line 55 for guiding fuel from the fuel tank 47 is connected to the suction connection pipe 52, and the other end side of the fuel supply line 55 has two branches. The pipe parts 71a and 71b are branched, and the branch pipe parts 71a and 71b are connected to first tank side connection pipes 56 provided on the left and right hanging parts 47a and 47b of the fuel tank 47. . The other end of the return pipe 72 is connected to the second tank side connection pipe 58.

  That is, a fuel supply line 71 that leads the fuel from the fuel tank 47 to the fuel pump 48 is connected to the front part of both hanging portions 47a and 47b of the fuel tank 47, and surplus fuel including vapor generated in the fuel pump unit 46 is supplied to the fuel pump. A return pipe line 72 returning from the unit 46 to the fuel tank 47 side is connected to the rear part of the hanging part 47 b of the fuel tank 47.

  According to the second embodiment, the fuel supply pipe 71 is connected to the left and right hanging portions 47a and 47b of the fuel tank 47, so that the fuel tank 47 is independent of the change in the posture of the motorcycle in the left-right direction. From this, fuel can be effectively supplied to the fuel pump 48. Further, the return pipe 72 for returning the surplus fuel including the vapor to the fuel tank 47 side is connected to the connecting part of the fuel supply pipe 71 to the hanging part 47b at a position separated in the front-rear direction. It is possible to prevent the vapor returned from the pump 48 from being mixed into the fuel supplied to the fuel pump 48.

  A third embodiment of the present invention will be described with reference to FIG. 6, but the parts corresponding to the first embodiment are indicated by the same reference numerals, and the detailed description will be given. Omitted.

  A suction connection pipe 52 provided at the upper part of the left end of the pump case 49 of the fuel pump unit 46 provided in the throttle device 40 is connected to one end of the fuel supply line 73 so as to communicate with the uppermost part in the pump case 49. One end of a return pipe 74 is connected to the return connection pipe 54 provided on the body 42 of the throttle body 44.

  First tank side connecting pipes 56 and 56 are provided at two locations separated from one another in the left and right hanging parts 47a and 47b in the fuel tank 47, and the other of the hanging parts 47a and 47b has a first tank. The second tank side connection pipe 58 is provided so that the upper end is disposed at a position higher than the upper ends of the tank side connection pipes 56.

  One end of a fuel supply line 73 for guiding fuel from the fuel tank 47 is connected to the suction connection pipe 52, and the other end side of the fuel supply line 73 has two branches. The pipe parts 73a and 73b are branched, and these branch pipe parts 73a and 73b are connected to first tank side connection pipes 56 provided in a hanging part 47a provided in the fuel tank 47. The other end of the return pipe 74 is connected to the second tank side connection pipe 58.

  In other words, the fuel supply pipe 73 that leads the fuel from the fuel tank 47 to the fuel pump 48 is connected to two places separated from the front and rear of one of the hanging portions 47a and 47b of the fuel tank 47, and vapor generated in the fuel pump unit 46 is generated. A return conduit 74 that returns the surplus fuel that is contained from the fuel pump unit 46 to the fuel tank 47 side is connected to the other of the hanging portions 47 a and 47 b of the fuel tank 47.

  According to the third embodiment, since the fuel supply pipe 73 is connected to two places separated from the front and rear of one of the left and right hanging parts 47a and 47b, the motorcycle changes its posture in the front-rear direction. Therefore, fuel can be effectively supplied from the fuel tank 47 to the fuel pump 48.

  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. Is possible.

DESCRIPTION OF SYMBOLS 13 ... Main frame 20 which is a frame member ... Cylinder part 21 ... Engine main body 38 ... Air cleaner 42 ... Body 44 ... Throttle body 46 ... Fuel pump unit 47 ... Fuel Tank 47a, 47b ... Droop 48 ... Fuel pump 49 ... Pump case 55, 71, 73 ... Fuel supply line 57, 72, 74 ... Return line CP ... Fuel pump Center axis F ... body frame

Claims (5)

  A fuel tank (47) having a pair of left and right hanging parts (47a, 47b) disposed on both sides of a frame member (13) that constitutes a part of the vehicle body frame (F) and extends in the front-rear direction includes the frame member (13). In a saddle-ride type vehicle in which a fuel pump (48) that sucks in fuel from the fuel tank (47) is disposed below the both hanging parts (47a, 47b). A fuel pump unit (46) including the fuel pump (48) and a pump case (49) in which the fuel pump (48) is accommodated has a center axis (CP) of the fuel pump (48) in the vehicle width direction. The fuel supply pipes (55, 73) that are arranged below the frame member (13) so as to be guided and guide fuel from the fuel tank (47) to the fuel pump (48) A return line connected to one of the hanging parts (47a, 47b) and for returning surplus fuel including vapor generated in the fuel pump unit (46) from the fuel pump unit (46) to the fuel tank (47) side (57, 74) is connected to the other of the left and right hanging parts (47a, 47b), a fuel supply structure in a saddle-ride type vehicle.   A fuel tank (47) having a pair of left and right hanging parts (47a, 47b) disposed on both sides of a frame member (13) that constitutes a part of the vehicle body frame (F) and extends in the front-rear direction includes the frame member (13). In a saddle-ride type vehicle in which a fuel pump (48) that sucks in fuel from the fuel tank (47) is disposed below the both hanging parts (47a, 47b). A fuel pump unit (46) including the fuel pump (48) and a pump case (49) in which the fuel pump (48) is accommodated has a center axis (CP) of the fuel pump (48) in the vehicle width direction. A fuel supply line (71) that is disposed below the frame member (13) and leads fuel from the fuel tank (47) to the fuel pump (48) is provided on the right and left sides. Return pipes (72) connected to the parts (47a, 47b) and returning the surplus fuel including the vapor generated in the fuel pump unit (46) from the fuel pump unit (46) to the fuel tank (47) side Is connected to one of the hanging portions at a position separated from the front and rear of the connecting portion of the fuel supply pipe (71) to one of the left and right hanging portions (47a, 47b). Fuel supply structure for riding type vehicles.   2. The fuel supply structure in a saddle-ride type vehicle according to claim 1, wherein the fuel supply pipe (73) is connected to two places separated from one another in front and rear of the left and right hanging parts (47a, 47b). .   The return position of the surplus fuel from the return pipe (57, 71, 74) into the fuel tank (47) is determined in the fuel tank (47) to the fuel supply pipe (55, 70, 73). The fuel supply structure in the saddle-ride type vehicle according to any one of claims 1 to 3, wherein the fuel supply position is set higher than the fuel supply position from the vehicle.   An engine body (21) having a forwardly inclined cylinder part (20) is mounted on the vehicle body frame (F) so as to be arranged below the frame member (13), and is arranged behind the cylinder part (20). The pump case (49) is coupled to a body (42) of a throttle body (44) disposed between the air cleaner (38) and the cylinder part (20). Fuel supply structure for saddle-ride type vehicles.

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