JP2018071491A - Fuel piping structure for ride type vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the reduction of the durability of a fuel hose due to the rotation of a fuel tank while arranging a plurality of components close to each other at the back of an internal combustion engine.SOLUTION: A fuel pipe structure 5 for a motor cycle 1 comprises: a parallel two-cylinder engine 4 supported by a body frame 2; a throttle body 44 connected to an intake port 43; an air cleaner 42 arranged over the engine 4; a fuel tank 30 arranged over the air cleaner 42; and a fuel pump 70 connected through a fuel hose 80 to an injector 55. The fuel tank 30 rotates around a support shaft 64c. The fuel pump 70 is arranged between the support shaft 64c and the injector 55. The fuel hose 80 includes: a first flow passage part 81 extending toward one vehicle width direction by changing the direction at a first bent part, after extending backward from an upstream side connection part 71; and a second flow passage part 82 extending forward by changing the direction at a second bent part and connected to a downstream side connection part 74.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a fuel piping structure for a saddle riding type vehicle.

  2. Description of the Related Art There is known a motorcycle that has a configuration in which a fuel tank is angularly displaced in the vertical direction around a support shaft disposed at a rear portion thereof, and can easily check an air cleaner or a throttle body.

  Patent Document 1 discloses a fuel hose for connecting a fuel pump provided in a fuel tank and a fuel supply unit such as an injector when the fuel tank is angularly displaced upward in such a motorcycle. A technique for eliminating the need for removal is described. In the technique described in Patent Document 1, the fuel hose is curved to one side in the vehicle width direction and extended in the vertical direction, thereby causing the fuel hose to follow the angular displacement (rotation) of the fuel tank and causing the fuel tank to be angularly displaced. Even so, a configuration that does not require removal of the fuel hose is realized.

Japanese Patent No. 5556246

  By the way, it is considered that the technique described in Patent Document 1 is premised on a vehicle in which the vehicle width is not narrow and a plurality of components can be arranged with a margin behind the engine. At least this technology is based on a motorcycle in which the fuel supply unit and the fuel pump are arranged at some distance from each other in a state where the fuel tank is not angularly displaced, that is, in a state where the fuel tank is closed.

  On the other hand, in the case of a vehicle having a narrow vehicle width and a plurality of components arranged close to each other behind the engine, there are the following problems. That is, in the case of such a vehicle, the fuel pump and the fuel supply unit (for example, an injector or a delivery pipe) may approach each other with the fuel tank closed. In this case, the upstream connection portion where the fuel pump and the upstream end portion of the fuel hose are connected and the downstream connection portion where the fuel supply portion and the downstream end portion of the fuel hose are connected approach each other. Depending on the positional relationship between the fuel pump and the fuel supply unit when approaching, the upstream connection portion and the downstream connection portion may be at substantially the same height. When the upstream side connection portion and the downstream side connection portion are close to each other, deformation such as bending or twisting of the fuel hose accompanying rotation of the fuel tank becomes large. For this reason, when the deformation of the fuel hose during the rotation of the fuel tank becomes local, the load concentrates on the deformed portion, and the durability of the fuel hose may be reduced.

  Therefore, when arranging the fuel hose so that it bypasses between the fuel pump and the fuel supply unit when the fuel tank is closed, the bypass path of the fuel hose is set appropriately so that the deformation of the fuel hose does not become local It is desirable to do. However, since the ABS unit, cooling water reservoir tank, electrical parts, etc. are arranged close to each other behind the engine where the fuel pump and the fuel supply unit are arranged, such a detour route for such a fuel hose is set. It is difficult to do.

  On the other hand, for example, it is conceivable to use a joint pipe having a rotation mechanism for connecting the fuel pump and the fuel hose to absorb the twist of the fuel hose accompanying the rotation of the fuel tank. However, the joint pipe having the rotation mechanism is large, and it is difficult to provide such a large component at a location where the fuel pump and the fuel supply unit are close to each other. Further, as described above, when the upstream side connection portion and the downstream side connection portion are close to each other, the twist of the fuel hose may not be absorbed only by the rotation of the joint pipe.

  The present invention has been made in view of the above problems. The object of the present invention is to improve the durability of the fuel hose by rotating the fuel tank while arranging a plurality of components close to each other behind the internal combustion engine. It is an object of the present invention to provide a fuel piping structure for a saddle riding type vehicle capable of suppressing the decrease.

In order to solve the above-described problems, a fuel piping structure for a saddle riding type vehicle according to the present invention includes a parallel two-cylinder internal combustion engine supported by a vehicle body frame and a throttle connected to an intake port formed at the rear of the internal combustion engine. A body, an air cleaner disposed above the internal combustion engine and supplying combustion air to the throttle body, a fuel tank disposed above the air cleaner and storing fuel, and supported by the throttle body. A fuel supply unit that supplies the fuel to the throttle body or the downstream side of the throttle body; and a fuel supply unit that is provided in the fuel tank and is connected to the fuel supply unit via a fuel hose. A fuel pump that sends fuel from the tank to the fuel supply unit, and the fuel tank is provided between the rear part and the body frame. The fuel hose is connected between an upstream connection part of the fuel pump and a downstream connection part of the fuel supply part, and the fuel tank is supported by the fuel pump. In the closed state covering the air cleaner,
The fuel pump is disposed in front of the support shaft and rearward of the fuel supply unit when viewed from a plane, and the upstream connection portion and the downstream connection portion are arranged in a vertical direction when viewed from a side surface. The fuel hose is disposed close to the same height or in the vertical direction, and the fuel hose extends backward from the upstream connection portion, and then changes direction at the first bent portion and extends in one direction in the vehicle width direction. A second flow connected to the downstream connection portion of the passage portion and the downstream end of the first flow passage portion via a second bent portion, and is changed in direction at the second bent portion to extend forward. And a road part.

  ADVANTAGE OF THE INVENTION According to this invention, the fall of durability of the fuel hose by rotation of a fuel tank can be suppressed, arrange | positioning several components close to each other behind an internal combustion engine.

1 is a side view showing a motorcycle according to an embodiment of the present invention. 1 is a side view showing a main part of a motorcycle according to an embodiment of the present invention. 1 is a front view showing a main part of a motorcycle according to an embodiment of the present invention. 1 is a plan view showing a main part of a motorcycle according to an embodiment of the present invention. 1 is a perspective view showing a main part of a motorcycle according to an embodiment of the present invention. 1 is a side view showing a fuel piping structure of a motorcycle according to an embodiment of the present invention. 1 is a plan view showing a fuel piping structure of a motorcycle according to an embodiment of the present invention. 1 is a bottom view showing a part of a fuel pipe structure of a motorcycle according to an embodiment of the present invention. 1 is a side view showing a fuel pipe structure of a motorcycle according to an embodiment of the present invention, showing a state in which a fuel tank is opened.

  The fuel piping structure according to the embodiment of the present invention is provided in a straddle-type vehicle such as a motorcycle, a tricycle, and a buggy. This straddle-type vehicle fuel pipe structure relates to a fuel hose pipe for supplying fuel stored in a fuel tank to an internal combustion engine.

  The fuel piping structure of the saddle riding type vehicle according to the present embodiment includes an internal combustion engine, a throttle body, an air cleaner, a fuel tank, a fuel supply unit, and a fuel pump.

  An internal combustion engine is an engine that takes out power by burning fuel. The internal combustion engine is a parallel 2-cylinder internal combustion engine supported by a body frame. The body frame constitutes the skeleton of the saddle riding type vehicle.

  The throttle body is connected to an intake port formed at the rear part of the internal combustion engine. An air cleaner is a device for removing foreign substances contained in inhaled air. The air cleaner is disposed above the internal combustion engine and supplies combustion air to the throttle body. The air cleaned by the air cleaner flows downward from above and flows into the throttle body. That is, this internal combustion engine includes a so-called downdraft type intake system.

  The fuel tank is a member for storing fuel to be supplied to the internal combustion engine. The fuel tank is disposed above the air cleaner. The fuel tank is supported so as to be rotatable in the vertical direction around a support shaft provided between the rear portion and the vehicle body frame. The fuel tank is configured to be rotatable between a closed state that covers the air cleaner and an open state that exposes the air cleaner.

  The fuel supply unit is supported by the throttle body and supplies fuel to the throttle body or the downstream side of the throttle body. For example, the fuel supply unit injects fuel toward the clean air sent from the air cleaner to the throttle body.

  The fuel pump is a device for sending fuel from a fuel tank to a fuel supply unit. The fuel pump is provided inside the fuel tank. In a state where the fuel tank is closed, the fuel pump is disposed in front of the support shaft and rearward of the fuel supply unit as viewed from above.

  The fuel pump is connected to the fuel supply unit via a fuel hose. The fuel hose is connected between the upstream connection part of the fuel pump and the downstream connection part of the fuel supply part. With the fuel tank closed, the upstream connection portion and the downstream connection portion are disposed at the same height in the vertical direction or close to the vertical direction when viewed from the side.

  The fuel hose includes a first flow path portion and a second flow path portion. With the fuel tank closed, the fuel hoses (first and second flow path portions) are arranged in a substantially horizontal posture. The first flow path portion extends rearward from the upstream connection portion, changes direction at the first bent portion, and extends in one direction in the vehicle width direction. The second flow path portion is connected to the downstream end of the second flow path portion via the second bent portion, and changes its direction at the second bent portion and extends forward. The downstream end of the second flow path part is connected to the downstream connection part.

  Since the parallel two-cylinder internal combustion engine is narrow in the vehicle width direction, the space behind the internal combustion engine is also narrowed. With the fuel tank closed, the upstream connection part and the downstream connection part, to which the fuel hose is connected, are arranged at the same height (or close in the vertical direction) and close in the front-rear direction. become. When the fuel tank is rotated upward to be in an open state, the fuel pump is also rotated upward integrally with the fuel tank. Therefore, the upstream side connection portion moves higher than the downstream side connection portion, and the fuel hose is twisted at a plurality of bent portions and displaced so as to be longer in the vertical direction.

  In the fuel piping structure of the saddle riding type vehicle according to the present embodiment, the fuel hose extending rearward from the fuel pump with the fuel tank closed crosses in the vehicle width direction and is located in front of the fuel pump. Connected to the supply section. By diverting the fuel hose so as to pass through the rear of the fuel pump, the length of the fuel hose can be secured sufficiently long even if the upstream connection portion and the downstream connection portion are close to each other. Further, by twisting the fuel hose by opening and closing the fuel tank, a plurality of bent portions such as the first bent portion and the second bent portion formed in the fuel hose by detouring the fuel hose are dispersed and absorbed. It is possible to prevent the load from being concentrated locally on the fuel hose. Further, by bypassing the fuel hose so as to surround the fuel pump, the bypass path of the fuel hose can be contained in a small region. As a result, even when an ABS unit, a cooling water reservoir tank, electrical parts, etc. are arranged close to each other behind the internal combustion engine, the fuel hose is made sufficiently long and the twist of the fuel hose is distributed by a plurality of bent portions. The fuel hose can be properly diverted to absorb. As described above, according to the fuel piping structure of the saddle-ride type vehicle according to the present embodiment, a load is locally applied to the fuel hose when the fuel tank is rotated while the plurality of components are arranged close to each other behind the internal combustion engine. Concentration can be prevented, and a decrease in the durability of the fuel hose can be suppressed. Further, the fuel hose can be piped without changing the layout of other parts arranged around the internal combustion engine.

  Hereinafter, a fuel piping structure of a saddle riding type vehicle according to an embodiment of the present invention will be described.

  With reference to FIG. 1 thru | or FIG. 4, the whole structure of the motorcycle 1 as an example of a straddle-type vehicle is demonstrated. FIG. 1 is a side view showing a motorcycle 1. FIG. 2 is a side view showing a main part of the motorcycle 1. FIG. 3 is a front view showing a main part of the motorcycle 1. FIG. 4 is a plan view showing a main part of the motorcycle 1. FIG. 5 is a perspective view showing a main part of the motorcycle 1. FIG. 6 is a side view showing the fuel piping structure 5 of the motorcycle 1. In the following description, the front, rear, left, right, up and down directions are based on the driver seated on the seat 32 of the motorcycle 1.

  As shown in FIG. 1, a motorcycle 1 is schematically configured to include a body frame 2, a body cover 3, and an engine 4. The body frame 2 constitutes the skeleton of the motorcycle 1. The vehicle body cover 3 is provided so as to cover the vehicle body frame 2 and the like. The engine 4 is mounted on the body frame 2.

  As shown in FIGS. 2 to 5, the body frame 2 includes a head pipe 10, a pair of left and right main frames 11, a pair of left and right pivot frames 12, a pair of left and right seat rails 13, and a pair of left and right side frames 14. And.

  The head pipe 10 is disposed on the upper front side of the vehicle, and rotatably supports a steering shaft (not shown). The steering shaft supports a pair of left and right front forks 15 via a bracket (not shown) (see FIG. 1). A front wheel 16 is rotatably supported at the lower end portion of the front fork 15, and a handle bar 17 is supported at the upper end portion of the front fork 15 (see FIG. 1).

  The pair of left and right main frames 11 branch from the head pipe 10 in the left-right direction (vehicle width direction) and extend rearward and obliquely downward. The main frame 11 includes a pair of upper and lower main pipes 11U and 11D having a circular cross section. A fuel tank 30 is provided above the pair of left and right main pipes 11U. The fuel tank 30 stores fuel (for example, gasoline) to be supplied to the engine 4. Although details will be described later, the fuel tank 30 is supported so as to be rotatable in the vertical direction around a support shaft 64c (see FIG. 2) provided between the rear portion and the vehicle body frame 2.

  A pair of left and right lower pipes 20, an upper pipe 21, an upper plate 22, and a lower plate 23 are connected to the main frame 11. Each of the pair of lower pipes 20 extends rearward and obliquely downward from the front end of the main pipe 11D. The upper pipe 21 is provided between the pair of main pipes 11U behind the head pipe 10 (see FIG. 4). The lower pipe 20 and the upper pipe 21 are constituted by pipes having a circular cross section. The upper plate 22 is provided across the upper end portion of the head pipe 10, the pair of main pipes 11 </ b> U, and the upper pipe 21. The lower plate 23 is provided across the lower end portion of the head pipe 10, the pair of main pipes 11 </ b> D, and the pair of lower pipes 20. The upper plate 22 and the lower plate 23 are formed in a substantially plate shape.

  The pair of left and right pivot frames 12 are connected to the rear portion of the main frame 11 and extend downward from the main frame 11 (see FIG. 2). As shown in FIG. 1, a swing arm 18 is supported between a pair of left and right pivot frames 12 via a pivot shaft 12a so as to be swingable in the vertical direction. A rear wheel 19 is rotatably supported at the rear end of the swing arm 18. A rear suspension 31 is provided between the upper part of the pivot frame 12 and the swing arm 18.

  As shown in FIG. 2, the pair of left and right seat rails 13 are connected to the upper end portion of the pivot frame 12 (the rear portion of the main frame 11), and extend rearward and obliquely upward. A frame bridge 13a is provided between the pair of left and right seat rails 13. The pair of left and right side frames 14 is provided between the upper part of the pivot frame 12 and the rear part of the seat rail 13. The seat rail 13 and the side frame 14 are configured by pipes having a circular cross section.

  On the upper side of the pair of left and right seat rails 13, a seat 32 for a driver to sit is provided (see FIG. 1). The seat 32 is provided so as to continue to the rear of the fuel tank 30. Below the seat 32, a battery 33 for supplying power to various electrical components is disposed (see FIGS. 2 and 5).

  As shown in FIG. 1, the vehicle body cover 3 includes an upper cowl 3a, an under cowl 3b, and a pair of left and right seat cowls 3c. The upper cowl 3 a is provided so as to cover the upper part of the front fork 15. The under cowl 3 b is connected to the lower end of the upper cowl 3 a and is provided so as to cover a part of the engine 4. The pair of left and right seat cowls 3c are provided so as to cover the main frame 11, the seat rails 13, and the side frames 14. The seat cowl 3 c is connected to the upper part of the upper cowl 3 a and extends rearward along the lower ends of the fuel tank 30 and the seat 32.

  As shown in FIGS. 2 and 3, the engine 4 as an example of the internal combustion engine is a parallel two-cylinder engine and is disposed below the main pipe 11D. The engine 4 is supported by the main frame 11, the pivot frame 12, the lower pipe 20, and the like. The engine 4 is fastened together with the swing arm 18 via the pivot shaft 12a and functions as a structural member of the vehicle body frame 2 (see FIG. 1).

  A crankshaft (not shown) is rotatably provided in the crankcase 40. Each cylinder 41 is provided with a piston (not shown) connected to the crankshaft via a connecting rod (not shown). Since the two cylinders 41 have substantially the same structure, the following description will mainly describe one cylinder 41 and its peripheral members.

  Above the rear part of the crankcase 40, an ABS (Antilock Break System) unit 34 is arranged (see FIG. 6). The ABS unit 34 is a device that suppresses the locking of the front wheels 16 and the rear wheels 19 during brake operation. The ABS unit 34 is disposed in a corresponding region between the pair of main frames 11 when viewed from the plane (see FIG. 4).

  The cylinder 41 is provided in a posture inclined forward on the upper surface of the crankcase 40. A cylinder head 53 is provided above the cylinder 41, and a head cover 54 is provided above the cylinder head 53.

  Above the cylinder 41 (head cover 54), an air cleaner 42 for removing foreign substances contained in the air is disposed. The air cleaner 42 is disposed between the fuel tank 30 and the cylinder 41 when viewed from the side (see FIG. 4).

  As shown in FIG. 6, an intake port 43 that connects the throttle body 44 is formed in the rear portion of the cylinder head 53. The throttle body 44 is disposed immediately below the rear portion of the air cleaner 42. The throttle body 44 is connected to the air cleaner 42 via the outlet tube 52. The engine 4 includes a so-called downdraft intake system that supplies clean air from above to the throttle body 44.

  An injector 55 is supported on the downstream side of the throttle body 44. The injector 55 is connected to the fuel tank 30 via the fuel hose 80. The injector 55 supplies fuel to the throttle body 44 (or the downstream side of the throttle body 44).

  As shown in FIG. 2, an exhaust port 45 for connecting the exhaust pipe 46 is formed in the front portion of the cylinder head 53. The exhaust pipe 46 is U-turned and extends backward. Note that the rear portions of the two exhaust pipes 46 extending from the two cylinders 41 merge into one and are connected to the exhaust muffler 47.

  Here, the operation of the engine 4 will be briefly described. Clean air flows from the air cleaner 42 into the throttle body 44. The injector 55 injects fuel toward the clean air sent to the throttle body. An air-fuel mixture obtained by mixing air and fuel is supplied into the cylinder 41 via the intake port 43. The engine 4 burns the air-fuel mixture in the cylinder 41 to reciprocate the piston. The reciprocating motion of the piston is converted into the rotational motion of the crankshaft, and the rear wheel 19 is rotated via a drive chain or the like (not shown). The exhaust gas after combustion is exhausted from the exhaust muffler 47 through the exhaust pipe 46 to the outside.

  By the way, the motorcycle 1 supports the fuel tank 30 on the vehicle body frame 2 in a rotatable manner in consideration of maintainability such as filter replacement of the air cleaner 42. In addition, the motorcycle 1 is configured to have a narrow (narrow) vehicle width by employing an in-line 2-cylinder engine 4. In such a motorcycle 1 narrow in the vehicle width direction, the space S surrounded by the pair of main frames 11 at the rear of the engine 4 is also narrowed (see FIG. 5). In the narrow space S, the connecting portions at both ends of the fuel hose 80 are arranged close to each other. For this reason, it is difficult to appropriately set the detour path of the fuel hose 80 so that the deformation of the fuel hose 80 accompanying the rotation of the fuel tank 30 does not concentrate locally. Therefore, the motorcycle 1 according to this embodiment includes the fuel pipe structure 5 that prevents the deformation of the fuel hose 80 accompanying the rotation of the fuel tank 30 from being concentrated locally in the narrow space S behind the engine 4. I have.

  As shown in FIG. 6, the fuel piping structure 5 of the motorcycle 1 includes a vehicle body frame 2, an engine 4, an air cleaner 42, a fuel tank 30, a pair of left and right throttle bodies 44, a pair of left and right injectors 55, a delivery pipe 56, a fuel. And a pump 70. These members are members constituting the motorcycle 1, but are also members constituting the fuel pipe structure 5 in the present embodiment. Prior to the description of the fuel piping structure 5, the structures of the air cleaner 42, the fuel tank 30, the throttle body 44, the injector 55, the delivery pipe 56, and the fuel pump 70 will be described.

  First, the air cleaner 42 will be described mainly with reference to FIG. The air cleaner 42 is provided to supply combustion air to the throttle body 44. The air cleaner 42 includes a filter (not shown) that partitions the interior of the cleaner case 50 into a dirty side and a clean side.

  The cleaner case 50 is made of, for example, a synthetic resin and has a substantially rectangular parallelepiped shape. The cleaner case 50 is formed so as to be gradually narrowed in the width direction from the front to the rear as seen from the plane (see FIG. 4). A gap for wiring a cable or the like is formed between both side surfaces of the cleaner case 50 and the pair of main frames 11. The cleaner case 50 is configured to be divided in the vertical direction. The filter is attached to the mating surface F between the upper and lower portions of the cleaner case 50.

  A mounting piece 50a is provided on the upper front side of the cleaner case 50 so as to protrude forward. The attachment piece 50a is fixed to the upper bracket 22a extending rearward from the upper plate 22 with a bolt B1 (see FIG. 4). An inlet tube 51 for taking outside air into the dirty side is provided below the front surface of the cleaner case 50. The inlet tube 51 is provided in a posture extending in the front-rear direction. At the rear part of the cleaner case 50, two outlet tubes 52 leading to the clean side are provided side by side in the left-right direction. The outlet tube 52 is provided in a posture extending in the vertical direction.

  An ECU 48 (Engine Control Unit) for controlling the engine 4 is attached to the upper surface of the cleaner case 50. The ECU 48 is connected to electronic devices such as the ABS unit 34 and the injector 55 via a harness 48a (see FIG. 4). The ECU 48 controls fuel injection, ignition timing, and the like. On the rear surface of the cleaner case 50, a wiring groove 50b for passing the harness 48a is formed in a recessed state (see FIG. 4).

  Next, the fuel tank 30 will be described mainly with reference to FIG. The fuel tank 30 is made of a thin sheet metal, for example, and is formed in a box shape that is long in the front-rear direction. The fuel tank 30 extends from the front end of the main frame 11 to the front end of the seat rail 13 (see FIG. 2).

  The fuel tank 30 has an inner recess 61 inside the outer body portion 60. A storage space 62 for storing fuel is formed between the outer main body 60 and the inner recess 61.

  The outer main body 60 constitutes the outer shape of the fuel tank 30. The outer main body 60 is formed slightly wider than the distance between the pair of main frames 11 (see FIGS. 3 and 4). The inner concave portion 61 is formed in a state of being recessed upward from the lower surface of the outer main body portion 60 in a region corresponding to between the pair of main frames 11. The inner recess 61 is formed in a substantially rectangular parallelepiped shape in the front half of the lower surface of the outer body 60. The storage space 62 is a space having a substantially arched cross section when viewed from the front. The storage space 62 is formed so as to cover the left and right sides, the rear side, and the upper side of the inner recess 61.

  A front end portion of the fuel tank 30 is fixed to the upper plate 22 with a bolt B2 via a front tank bracket 63 (see also FIG. 2). A rubber cushion (not shown) is sandwiched between the front tank bracket 63 and the upper plate 22.

  As shown in FIGS. 5 and 6, the rear end portion of the fuel tank 30 is attached to the frame bridge 13 a via the rear tank support mechanism 64. The rear tank support mechanism 64 includes a rotation bracket 64b that is rotatably supported around a support shaft 64c with respect to the tank support bracket 64a. The tank support bracket 64a and the rotation bracket 64b are made of, for example, metal and have a substantially U shape. The tank support bracket 64a is fixed to the upper surface of the frame bridge 13a with a plurality of bolts B3. The rotating bracket 64b is fixed to the rear end surface of the fuel tank 30 with a plurality of bolts B4. A rubber cushion (not shown) is sandwiched between the tank support bracket 64a and the frame bridge 13a.

  The fuel tank 30 rotates around the support shaft 64c with the bolt B2 of the front tank bracket 63 removed (see the arrow in FIG. 2). The fuel tank 30 is configured to be rotatable between a closed state that covers the air cleaner 42 (see FIG. 6) and an open state that exposes the air cleaner 42 (see FIG. 9). By making the fuel tank 30 open, maintenance of the air cleaner 42 and the like can be performed.

  As shown in FIG. 5, a canister 49 for adsorbing fuel (evaporated fuel) vaporized in the fuel tank 30 is suspended from the frame bridge 13a. The canister 49 is fastened together with the tank support bracket 64a to the frame bridge 13a.

  Next, the pair of left and right throttle bodies 44, the pair of left and right injectors 55, and the delivery pipe 56 will be described with reference to FIGS. FIG. 7 is a plan view showing the fuel piping structure 5. FIG. 8 is a bottom view showing a part of the fuel piping structure 5. Since the pair of throttle bodies 44 have substantially the same structure, the following description will mainly focus on one throttle body 44. For the same reason as this, hereinafter, one injector 55 will be mainly described.

  The throttle body 44 is a device that adjusts the amount of clean air supplied from the air cleaner 42 to the intake port 43 by means of a throttle valve (not shown) provided therein. The throttle body 44 is formed in a substantially cylindrical shape and is connected to the intake port 43 (see FIG. 6). The throttle body 44 is connected to an outlet tube 52 that extends downward from the cleaner case 50 (see FIG. 6). That is, the throttle body 44 is provided between the intake port 43 and the air cleaner 42. A throttle cable 44a extending from a throttle (not shown) of the handle bar 17 is connected to the throttle body 44 (throttle valve) (see FIG. 4). The throttle valve is opened and closed according to the opening of the throttle.

  The injector 55 is connected to the rear lower part of the throttle body 44. The injector 55 is a device that is controlled by the ECU 48 and injects fuel toward the intake port 43. The ECU 48 controls the fuel injection amount and injection timing from the injector 55 in accordance with the throttle opening.

  The delivery pipe 56 constitutes a flow path for guiding fuel to the throttle body 44 (or the downstream side of the throttle body 44) via a pair of injectors 55. The delivery pipe 56 is formed long in the left-right direction (vehicle width direction) so as to be bridged between the pair of left and right injectors 55. The delivery pipe 56 is connected to the upper rear side of the pair of left and right injectors 55. The injector 55 and the delivery pipe 56 are specific examples of the “fuel supply unit” in the claims.

  The delivery pipe 56 is integrally formed with a downstream connection portion 74 for connecting the fuel hose 80. The downstream connection part 74 is formed on the right side of the center of the delivery pipe 56. The downstream side connection portion 74 is provided in a state extending rearward from the delivery pipe 56.

  Next, the fuel pump 70 will be described with reference to FIGS. The fuel pump 70 is an electric pump that feeds fuel under pressure. The fuel pump 70 is provided inside the fuel tank 30 (storage space 62) (see FIG. 6). The fuel pump 70 is disposed behind the inner recess 61. The fuel pump 70 is attached to the bottom surface of the outer main body 60 via a pump attachment plate 70a. The fuel pump 70 is provided in a standing posture with respect to the pump mounting plate 70a.

  An upstream connection 71 is provided on the lower surface of the fuel pump 70 (see FIG. 8). The upstream connection portion 71 is provided on the left front side of the fuel pump 70. The upstream side connection portion 71 is provided in a state extending toward the left direction (the other in the vehicle width direction).

  The fuel pump 70 is connected to the delivery pipe 56 via the fuel hose 80. The fuel pump 70 is a device that sends the fuel stored in the storage space 62 from the fuel tank 30 to the injector 55. The fuel hose 80 is connected between the upstream connection portion 71 of the fuel pump 70 and the downstream connection portion 74 of the delivery pipe 56.

  Next, the fuel piping structure 5 of the motorcycle 1 will be described with reference to FIGS. FIG. 9 is a side view showing the fuel piping structure 5 and shows a state in which the fuel tank 30 is opened. In the following description, the description is mainly based on the state where the fuel tank 30 is closed. In the following description, “upstream” and “downstream” and similar terms refer to “upstream” and “downstream” in the fuel supply direction (flow direction) and similar concepts.

  As shown in FIG. 6, the engine 4, the throttle body 44, the injector 55, and the delivery pipe 56 are disposed below the main frame 11 (main pipe 11D) when viewed from the side. The throttle body 44, the injector 55 and the delivery pipe 56 are arranged in the space S behind the cylinder 41. The air cleaner 42 is disposed above the engine 4 when viewed from the side. The fuel tank 30 is disposed above the air cleaner 42 and above the main frame 11 (main pipe 11U) when viewed from the side. The upper part of the air cleaner 42 is fitted in the inner recess 61 of the fuel tank 30. The fuel pump 70 is disposed above the main frame 11 (main pipe 11U) when viewed from the side. The upstream connection portion 71 of the fuel pump 70 and the downstream connection portion 74 of the delivery pipe 56 are arranged close to each other in the vertical direction when viewed from the side. Precisely, the upstream connection portion 71 is disposed slightly above the downstream connection portion 74. Since the space S behind the cylinder 41 is narrow, the upstream connection portion 71 and the downstream connection portion 74 are arranged close to each other in the vertical direction and close to the front and rear direction.

  The air cleaner 42 is disposed between the pair of main frames 11 as viewed from above (see FIG. 4). As shown in FIG. 7, the throttle body 44, the injector 55, and the delivery pipe 56 are disposed between a pair of main frames (near the center in the vehicle width direction) as viewed from above. The fuel pump 70 is disposed in a corresponding region (near the center in the vehicle width direction) between the pair of main frames as viewed from above. The fuel pump 70 is disposed forward of the support shaft 64c and rearward of the delivery pipe 56 and the like when viewed from above. That is, the fuel pump 70 is disposed between the delivery pipe 56 and the like and the rear tank support mechanism 64.

  Here, as shown in FIG. 9, when the fuel tank 30 is rotated upward to be in an open state, the fuel pump 70 is also rotated integrally with the fuel tank 30. Therefore, the upstream side connection portion 71 is separated upward from the downstream side connection portion 74. That is, the interval (straight line distance) between the upstream side connection portion 71 and the downstream side connection portion 74 is short when the fuel tank 30 is closed (see FIG. 6), and is long when the fuel tank 30 is open. For this reason, the fuel hose 80 connecting both the connecting portions 71 and 74 needs to be formed to have a length that allows the fuel tank 30 to be opened and closed (turned).

  The fuel hose 80 will be described with reference to FIGS. The fuel hose 80 is made of, for example, an elastically deformable synthetic resin material. The upstream end of the fuel hose 80 is connected to the upstream connection portion 71 via the upstream joint portion 72. The downstream end of the fuel hose 80 is connected to the downstream connection part 74 via the downstream joint part 73.

  The upstream side joint portion 72 includes an upstream side inner tube 72b extending rearward from the left end portion of the upstream side outer tube 72a. That is, the upstream joint portion 72 is formed in an L shape. The upstream connection portion 71 of the fuel pump 70 is fixed in a state of being inserted into the upstream outer pipe 72a. The upstream inner pipe 72 b is fixed in a state where it is inserted into the upstream end of the fuel hose 80.

  The downstream side joint part 73 is the same L-shaped member as the upstream side joint part 72. The downstream joint portion 73 includes a downstream inner tube 73b extending in the right direction from the rear end portion of the downstream outer tube 73a. The downstream connection portion 74 of the injector 55 is fixed in a state of being inserted into the downstream outer tube 73a. The downstream side inner pipe 73 b is fixed in a state where it is inserted into the downstream end of the fuel hose 80.

  The fuel hose 80 is integrally formed of a first flow path portion 81 and a second flow path portion 82 in order from upstream to downstream.

  As shown in FIGS. 7 and 8, the upstream end of the first flow path portion 81 is connected to the upstream inner pipe 72 b of the upstream joint portion 72. The first flow path portion 81 slightly extends backward from the upstream joint portion 72 (upstream connection portion 71). The first flow path portion 81 extends rearward, then changes direction at the first bent portion 81a and extends rightward (one in the vehicle width direction). The first flow path portion 81 is gently bent at the first bent portion 81a and substantially at a right angle as a whole. The upstream inner pipe 72b and the first bent portion 81a of the upstream joint portion 72 are provided at positions close to the left main frame 11 (see FIG. 7). The first flow path portion 81 is piped so as to cross the rear side of the fuel pump 70 as viewed from above.

  The second flow path portion 82 is provided in a state of being connected to the downstream end of the first flow path portion 81 via the second bent portion 82a. The second flow path portion 82 changes its direction at the second bent portion 82a and extends forward. The second flow path portion 82 is gently bent at the second bent portion 82a and substantially at a right angle as a whole. The second bent portion 82a is provided at a position close to the right main frame 11 (see FIG. 7). The second flow path portion 82 extends to substantially the same position as the upstream connection portion 71 when viewed from the plane (bottom surface).

  The second flow path portion 82 extends forward from the second bent portion 82a, and then turns to the left (the other in the vehicle width direction) at the third bent portion 82b. The second flow path portion 82 is bent at a substantially right angle as viewed from the whole at the third bent portion 82b. The third bent portion 82b is provided at a position close to the right main frame 11 (see FIG. 7). The downstream end of the second flow path portion 82 is connected to the downstream inner pipe 73 b (downstream connection portion 74) of the downstream joint portion 73. The downstream inner pipe 73b is disposed slightly forward of the upstream connection portion 71 as viewed from the plane (bottom surface).

  As shown in FIG. 6, the upstream connection portion 71, the upstream joint portion 72, the first flow path portion 81 (first bent portion 81a), the second flow path portion 82 (second bent portion 82a), and the downstream joint. The part 73 and the downstream connection part 74 are arranged at substantially the same height. That is, the fuel hose 80 is arranged in a substantially horizontal posture. Precisely, the fuel hose 80 is provided so as to have a slight downward slope from upstream to downstream. More precisely, the first flow path part 81 is provided substantially horizontally, and the second flow path part 82 is provided so as to have a slight downward slope from the rear (upstream side) to the front (downstream side). Yes.

  As shown in FIGS. 7 and 8, the fuel hose 80 is piped in a substantially rectangular ring around the fuel pump 70 as viewed from the plane (bottom surface). The fuel hose 80 is disposed between the pair of main frames 11 and surrounding the fuel pump 70 when viewed from the plane (bottom surface). The range (left-right width) of the fuel hose 80 in the left-right direction is substantially the same as or smaller than the distance between the pair of left and right main frames 11 (see FIG. 7). Further, the front-rear direction range (front-rear length) of the fuel hose 80 is formed substantially the same as the front-rear length (diameter) of the fuel pump 70. The front and rear length of the fuel hose 80 is formed smaller than the front and rear length (diameter) of the pump mounting plate 70a.

  As shown in FIG. 9, when the fuel tank 30 is rotated from the closed state to the open state, the fuel hose 80 is twisted by the three bent portions 81 a, 82 a, and 82 b so as to be elongated in the vertical direction. To do. Specifically, the first flow path portion 81 is twisted by the first bent portion 81a and the second bent portion 82a, and is displaced to a posture inclined downward from the left side (upstream side) to the right side (downstream side). That is, the 1st flow path part 81 changes a attitude | position by disperse | distributing twist to two places. On the other hand, the second flow path portion 82 is twisted by the second bent portion 82a and the third bent portion 82b, and is displaced to a posture further inclined downward from the rear toward the front. In other words, the second flow path portion 82 increases the inclination angle by dispersing the twist in two places.

  In the fuel pipe structure 5 of the motorcycle 1 according to the present embodiment described above, the fuel hose 80 extending rearward from the fuel pump 70 crosses in the vehicle width direction with the fuel tank 30 closed, Also, it is configured to be connected to the delivery pipe 56 located in front. That is, the fuel hose 80 extends in a direction away from the injector 55, and then extends in a direction of approaching the injector 55 around the fuel pump 70. By diverting the fuel hose 80 so as to pass through the back of the fuel pump 70, the length of the fuel hose 80 is ensured sufficiently long even if the upstream connection portion 71 and the downstream connection portion 74 are close to each other. be able to. Further, in the fuel piping structure 5 of the motorcycle 1 according to the present embodiment, the fuel hose 80 is configured to follow the opening and closing of the fuel tank 30 by being twisted by the three bent portions 81a, 82a, and 82b. With this configuration, the three bent portions 81a, 82a, and 82b act on the fuel hose 80 (each bent portion 81a, 82a, and 82b) to disperse and absorb the twist of the fuel hose 80 that accompanies the opening and closing of the fuel tank 30. Can be distributed. As described above, even when the connecting portions 71 and 74 must be arranged in a compact manner, the fuel hose 80 is formed to a necessary length, and the twist of the fuel hose 80 is absorbed and absorbed when the fuel tank 30 is rotated (opened / closed). Therefore, it is possible to prevent the load from being concentrated locally on the fuel hose 80 and to suppress the durability of the fuel hose 80 from being lowered.

  Further, in the fuel pipe structure 5 of the motorcycle 1 according to the present embodiment, the fuel hose 80 is piped around the fuel pump 70, and therefore, for example, components (ABS unit 34) arranged around the engine 4. , Interference with the canister 49, a reservoir tank (not shown) of cooling water, etc. can be prevented. Therefore, the fuel hose 80 can be piped without changing the layout of components around the engine 4 such as the ABS unit 34. Further, the fuel hose 80 can be configured to have a length necessary for opening and closing the fuel tank 30 by making the best use of the narrow vehicle width (space S).

  Further, even when the upstream joint portion 72 and the downstream joint portion 73 that do not have the rotation mechanism are used, the twist of the fuel hose 80 can be sufficiently absorbed by the plurality of bent portions 81a, 82a, and 82b. Therefore, small joints that do not have a rotation mechanism can be adopted as the upstream joint portion 72 and the downstream joint portion 73, and the fuel pipe structure 5 is provided at a place where a large number of parts are arranged close to each other. Can be formed compactly.

  In the fuel piping structure 5 of the motorcycle 1 according to the present embodiment, the upstream connection portion 71 extends leftward (the other in the vehicle width direction), and the downstream connection portion 74 extends rearward. Thereby, the fuel hose 80 can be connected to the upstream connection part 71 and the downstream connection part 74 without forcibly bending the fuel hose 80.

  In the fuel pipe structure 5 of the motorcycle 1 according to the present embodiment, the downstream side connection portion 74 is integrated with the delivery pipe 56. Thereby, for example, compared with the case where the downstream connection part 74 is separately connected to the delivery pipe 56 via a connector, the number of parts can be reduced. Moreover, since the connector is omitted, the length of the delivery pipe 56 can be shortened.

  In the fuel pipe structure 5 of the motorcycle 1 according to the present embodiment, the upstream connection portion 71 is disposed slightly above the downstream connection portion 74, but the present invention is not limited to this. For example, the upstream connection portion 71 and the downstream connection portion 74 may be arranged at the same height in the vertical direction when viewed from the side. Moreover, although the upstream side connection part 71 extended in the left direction (vehicle width direction other side), it may extend not only to this but to the right direction. Further, the upstream side connection portion 71 may be inclined forward or backward as viewed from the plane. Similarly, the downstream connection portion 74 may be inclined to the left or right as viewed from the plane.

  Further, in the fuel piping structure 5 of the motorcycle 1 according to the present embodiment, the fuel hose 80 is connected between the two connection portions 71 and 74 via the two joint portions 72 and 73. It is not limited to this. For example, at least one of the upstream side joint part 72 and the downstream side joint part 73 may be omitted.

  Further, in the fuel piping structure 5 of the motorcycle 1 according to the present embodiment, the fuel hose 80 is piped around the fuel pump 70 in a substantially rectangular ring shape, but the fuel hose 80 is arranged around the fuel pump 70 in a triangular ring shape, You may pipe in a trapezoid shape, an annular shape, a meniscus shape, etc.

  Moreover, in the motorcycle 1 according to the present embodiment, the parallel two-cylinder engine 4 is mounted, but the present invention is not limited to this. The present invention can also be applied to a straddle-type vehicle equipped with an engine other than the parallel two-cylinder engine, for example, a single cylinder engine or an engine having three or more cylinders. Even in a saddle-ride type vehicle equipped with an engine other than two cylinders, when the vehicle width is narrow, by applying the present invention, the above-described effects such as improving the durability of the fuel hose 80 can be achieved. Can be obtained.

  The present invention can be modified as appropriate without departing from the spirit or concept of the invention which can be read from the claims and the entire specification, and the fuel piping structure of a straddle-type vehicle with such a modification is also provided. It is included in the technical idea of the present invention.

1 Motorcycle (saddle-ride type vehicle)
2 Body frame 4 Engine (internal combustion engine)
5 Fuel Piping Structure 10 Head Pipe 11 Main Frame 30 Fuel Tank 42 Air Cleaner 43 Intake Port 44 Throttle Body 55 Injector (Fuel Supply Section)
56 Delivery pipe (fuel supply part)
64c Support shaft 70 Fuel pump 71 Upstream connecting portion 74 Downstream connecting portion 80 Fuel hose 81 First flow path portion 81a First bent portion 82 Second flow path portion 82a Second bent portion

Claims (4)

A parallel two-cylinder internal combustion engine supported by the body frame;
A throttle body connected to an intake port formed at the rear of the internal combustion engine;
An air cleaner disposed above the internal combustion engine for supplying combustion air to the throttle body;
A fuel tank disposed above the air cleaner and storing fuel;
A fuel supply unit that is supported by the throttle body and supplies the fuel downstream of the throttle body or the throttle body;
A fuel pump provided inside the fuel tank, connected to the fuel supply unit via a fuel hose, and sends the fuel from the fuel tank to the fuel supply unit;
The fuel tank is supported so as to be rotatable in a vertical direction around a support shaft provided between a rear portion thereof and the vehicle body frame,
The fuel hose is connected between an upstream connection part of the fuel pump and a downstream connection part of the fuel supply part,
In the closed state where the fuel tank covers the air cleaner,
The fuel pump is disposed in front of the support shaft and rearward of the fuel supply unit as viewed from above.
The upstream connection portion and the downstream connection portion are arranged at the same height in the vertical direction or close to the vertical direction when viewed from the side,
The fuel hose is
A first flow path portion extending rearward from the upstream connection portion and then changing the direction at the first bent portion and extending in the vehicle width direction;
A second flow path part connected to the downstream end of the first flow path part via a second bent part, changing the direction at the second bent part and extending forward, and connected to the downstream connection part; A fuel piping structure for a saddle-ride type vehicle characterized by comprising: The vehicle body frame includes a pair of main frames branched from the head pipe in the vehicle width direction and extending obliquely downward at the rear,
The internal combustion engine, the throttle body, and the fuel supply unit are disposed below the main frame,
The fuel tank and the fuel pump are disposed above the main frame,
The throttle body, the fuel supply unit, and the fuel pump are disposed in a corresponding region between the pair of main frames as viewed from above,
2. The fuel piping structure for a saddle-ride type vehicle according to claim 1, wherein the fuel hose is disposed between the pair of main frames as viewed from above and to surround the fuel pump. The fuel supply unit includes a delivery pipe that guides the fuel to the throttle body or the downstream side of the throttle body,
The upstream connection portion of the fuel pump extends toward the other in the vehicle width direction,
The fuel piping structure of the saddle riding type vehicle according to claim 1 or 2, wherein a downstream side connection portion of the fuel supply portion extends rearward from the delivery pipe.   The fuel piping structure for a saddle-ride type vehicle according to claim 3, wherein the downstream connection portion is formed integrally with the delivery pipe.

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