JP2007055564A - Fuel piping arrangement structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel piping arrangement structure capable of installing fuel piping so as not to be brought into contact with a vehicle body or the like without requiring a wide space for installing the fuel piping to feed fuel to an engine which is rockingly supported with respect to a vehicle body frame. <P>SOLUTION: In the fuel piping arrangement structure for arranging fuel piping 62 for feeding fuel to an engine 30 which is rockingly supported by a suspension part 14 provided on a vehicle body frame 10 from a fuel tank 50 fixed to the vehicle body frame 10, the fuel piping 62 has a flexible deflection-deformation part 65 formed between a vehicle body side fixed part 68 fixed to the vehicle body frame 10 and an engine side fixed part 67 fixed to the engine 30, and the deflection-deformation part 65 is arranged on a deflection-deformation plane 61 located along a rocking face 22 where the engine is rocked and in parallel with the face. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a fuel pipe arrangement structure in which one end side is fixed to a vehicle body frame and the other end side is swingably supported with respect to the vehicle body frame.

As this type of conventional fuel pipe arrangement structure, there is one disclosed in Patent Document 1. This fuel pipe arrangement structure is such that an engine having an internal combustion engine main body is swingably attached to a vehicle body frame with a cylinder head facing the front of the vehicle body, and a fuel pump is connected to a fuel tank attached to the vehicle body frame, A fuel injection valve is provided in the intake passage of the internal combustion engine body, and the fuel pump and the fuel injection valve are connected to each other by a fuel pipe. The second hose of the fuel pipe is provided around the internal combustion engine body including the head cover. Further, at least a head cover side extending portion extending in the swing direction is provided, and a part of the head cover side extending portion is supported by the first support member and the second support member provided in the internal combustion engine main body, thereby allowing the amount of vibration of the fuel piping to be increased. To reduce the size of the vehicle and reduce the force applied to the fuel pipe mounting part to reduce the rigidity of the pipe mounting part, thereby reducing the size and weight A.
JP 2005-104209 A

  However, in such a conventional fuel pipe arrangement structure, when the engine swings, the fuel pipe swings in the vertical direction of the vehicle body and also in the longitudinal direction of the vehicle body, so that the fuel pipe does not touch the vehicle body and the like. It is necessary to secure a sufficiently large space in order to arrange them in the vehicle, but if such a space is secured, the vehicle will be enlarged, so that it is difficult to actually implement it.

  In view of this, the present invention provides a fuel pipe that supplies fuel to an engine that is swingably supported with respect to the vehicle body frame, and does not require a large space and is installed so that the fuel pipe does not touch the vehicle body. An object of the present invention is to provide a fuel pipe arrangement structure.

  According to the first aspect of the invention for achieving the above object, there is provided a fuel pipe for supplying fuel from a fuel tank fixed to a vehicle body frame to an engine swingably supported by a suspension portion provided on the vehicle body frame. In the fuel pipe arrangement structure, the fuel pipe is formed between a vehicle body side fixing portion fixed to the vehicle body frame and an engine side fixing portion fixed to the engine, and has a flexibility. A deformation portion is provided, and the bending deformation portion is disposed on a bending deformation surface positioned in parallel along a surface on which the engine swings.

  According to a second aspect of the present invention, in the fuel pipe arrangement structure according to the first aspect, the bending deformation surface is located at a predetermined interval from the engine.

  According to a third aspect of the present invention, in the fuel pipe arrangement structure according to the first or second aspect, the bending deformation portion is formed in a curved shape that protrudes toward the suspension portion of the engine. And

  According to a fourth aspect of the present invention, in the fuel pipe arrangement structure of the first or second aspect, the vehicle body side fixing portion is arranged at a position lower than the engine side fixing portion.

  According to a fifth aspect of the present invention, in the fuel pipe arrangement structure according to the fourth aspect, the fuel tank is arranged in a lower part of the floor of a vehicle body.

  According to a sixth aspect of the present invention, in the fuel pipe arrangement structure according to the first or second aspect, the bending deformation surface is located on the right side of the engine suspended on the body frame.

  According to the present invention, a fuel pipe that supplies fuel to an engine that is swingably supported with respect to a vehicle body frame is installed so that the fuel pipe does not touch the vehicle body without requiring a large space. can do.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 to 4 show a first embodiment of the present invention, FIG. 1 is a vehicle right side view showing a fuel pipe arrangement state, FIG. 2 is a main part top view showing a fuel pipe arrangement state, and FIG. The principal part right side enlarged view which shows the motion of piping, FIG. 4 is a principal part top view enlarged view.

  As shown in FIG. 1 and FIG. 2, the fuel pipe arrangement structure 60 of the present embodiment is seated on the seat 16 with the occupant aligning the legs, and the speed is increased by the continuously variable transmission according to the output of the engine 30. The adjustment is applied to a fuel pipe 62 that supplies fuel to the engine 30 from the fuel tank 50 of the motorcycle 1 that is called a so-called scooter. The fuel pipe 62 includes a fuel pump 52, a fuel hose 64, and an injector 63. The engine 30 is integrated with the power transmission system 40 as a power unit 20 and is suspended from the body frame 10.

  The vehicle body frame 10 is formed of a pipe material, and includes a single down tube 12 disposed downward from the head pipe 11 that rotatably supports a steering shaft 17 that steers the vehicle, and a lower end of the down tube 12. It comprises two main frames 13 that branch left and right toward the rear of the vehicle, and a plurality of reinforcing portions 13a that connect these main frames 13 in a ladder shape. The two main frames 13 branched from the down tube 12 extend to the rear of the vehicle along the ground, form a floor portion 15 on which the fuel tank 50 is disposed, and then step up toward the rear and obliquely upward. It is bent.

  The fuel tank 50 is fixed at a portion where the two main frames 13 are branched from the down tube 12 and between the down tubes 12, that is, below the vehicle floor portion where the occupant puts his / her foot in the riding state (the vehicle under floor portion). The lowermost part of the fuel tank 50 is arranged above the lowermost part of the down tube 12 so as to be located above the vehicle. Thereby, when the vehicle gets over the obstacle, the down tube 12 hits the obstacle before the fuel tank 50, so that the fuel tank 50 can be protected from the obstacle on the road.

  The refueling port 51 is located on the passenger toe side (front) of the vehicle floor, the fuel pump 52 is located on the occupant heel side (rear) of the vehicle floor, and the refueling port 51 and the fuel pump 52 are arranged in a line along the vehicle longitudinal direction. Is arranged. Thereby, since the protruding portion of the vehicle floor portion by the fuel filler 51 and the fuel pump 52 is formed between the occupant's feet, the fuel filler 51 and the fuel pump without sacrificing the occupant's comfortability and the capacity of the fuel tank 50. 52 is arranged. In addition, a discharge port 53 is horizontally provided in the upper part of the fuel pump 52 toward the right rear side.

  The power unit 20 transmits the output of the engine 30 as a driving force to the rear wheel 41 via the power transmission system 40, and is disposed between the two main frames 13 and provided in the staircase shape portion of the main frame 13. The suspension 14 is suspended in a swingable manner in the vehicle vertical direction by a support portion 21 provided in the vicinity of the crankcase 32 of the engine 30.

  The rear wheel 41 includes a tire wheel 42 and a tire 43, and a wide tire 43 is attached to the tire wheel 42 in order to improve running performance on rough roads. Further, the rear wheel 41 is cantilevered by the power transmission system 40 so as to be rotatable from the left side of the vehicle. The power transmission system 40 is arranged on the left side of the vehicle in order to support the rear wheel 41 in a state of being arranged at the center of the vehicle, but is arranged further on the left side than the case of supporting a tire having a general width. Has been.

  The engine 30 is located behind the left and right main frames 13 and the fuel tank 50 with the cylinder head 31 in the front of the vehicle and the crankcase 32 in the rear of the vehicle. Located on the left side. An intake port 33 for supplying an air-fuel mixture to the combustion chamber of the engine 30 is provided on the vehicle upper side of the cylinder head 31, and an ignition plug 35 for igniting the air-fuel mixture in the combustion chamber is provided on the cylinder head. An exhaust port 34 that is disposed on the right side of the vehicle 31 and discharges the combustion gas in the combustion chamber is provided on the lower side of the cylinder head 31 in the vehicle. Since engine 30 is positioned on the left side of the vehicle, a relatively large space is formed between the right side of engine 30 and right main frame 13R, and a work space required for replacing spark plug 35, and The bending deformation portion 65 of the fuel pipe 62 described later functions as a deformation space necessary for bending deformation.

  In the engine 30, air is introduced into the intake port 33 by an intake duct 36 installed from the rear of the vehicle toward the front of the vehicle. The amount of air supplied to the engine is calculated from the detected value of the throttle opening and the engine rotation speed, and the fuel is directed from the injector 63 toward the intake port 33 so as to reach a predetermined air-fuel ratio according to the calculated amount of air. It is injected in the form of a mist to form a mixture of air and fuel. The injector 63 is positioned above the rear portion of the fuel tank 50, and the fuel whose pressure has been increased by the fuel pump 52 is supplied to the injector 63 engine 30 through the fuel pipe 62.

  The fuel hose 64 is formed into a tubular shape with a flexible material, and is bent downward toward the right main frame 13R toward the right main frame 13 with one end communicating with the discharge port 53 of the fuel pump 52. The vehicle body side hose clamp 68 disposed on the main frame 13R is fixed horizontally between the engine 30 and the right main frame 13R toward the rear of the vehicle, and the other end is connected to the injector 63 from the bending deformation portion 65 through the offset portion 66. It is communicated. The bending deformation portion 65 is located downstream of the fuel hose 64 with respect to the portion fixed by the vehicle body side hose clamp 68, and is parallel to the concave arcuate shape toward the fuel tank 50, that is, along the surface on which the engine swings. It is located on the bending deformation surface 61 that is positioned, is curved in an arc shape from the top to the front of the vehicle, and is arcuate so as to return toward the fuel tank 50, and is convex toward the suspension portion 14. . The offset portion 66 is located at the downstream end portion of the bending deformation portion 65, extends horizontally toward the injector 63 along the left-right direction of the vehicle, and is sucked by the engine-side hose clamp 67 serving as the engine-side fixing portion. It is fixed near the port 33. That is, the bending deformation portion 65 is disposed at a predetermined interval from the engine 30 by the offset portion 66 and is formed between the vehicle body side hose clamp 68 and the engine side hose clamp 67, and the vehicle body side hose clamp. 68 is disposed below the engine side hose clamp 67.

  When the rear wheel 41 swings toward the upper side of the vehicle when climbing over the step, it is suspended on the suspension part 14 by the support part 21 provided near the crankcase 32 of the engine 30 as shown in FIGS. Therefore, the cylinder head 31 of the engine 30 swings downward in the vehicle. For this reason, the fuel hose 64 is normally held at the position indicated by the solid line, but when the rear wheel 41 swings, the engine-side hose clamp 67 moves downward along with the cylinder head 31 along the cylinder head 31 as indicated by the two-dot chain line. Then, the entire bending deformation portion 65 is curved toward the rear of the vehicle while moving downward. Further, the bending deformation portion 65 swings on the bending deformation surface 61 without swinging in the vehicle left-right direction.

  As with the fuel hose 64, one is fixed to the vehicle body side, the other is fixed to the engine 30, and there is a wire harness 19 that controls the injector 63 as an object that swings together with the engine 30, which is shown in FIG. As shown in FIG. 5, the wire harness 19 is fixed to the engine 30 by fixing the harness clamp 18 to the engine side hose clamp 67.

  Further, in the present embodiment, the fuel hose 64 is formed into a shape along the wiring path so as to be bent and deformed within the predetermined bending deformation surface 61, but a frame having a cross section such as a rectangle or an ellipse. The body is arranged so that the longitudinal direction of the frame body is located along the bending deformation surface 61, and the bending deformation portion 65 is allowed to pass through the inside of the frame body. Therefore, it is possible to prevent the bending deformation portion 65 from swinging in the vehicle left-right direction.

  In the above configuration, the bending deformation portion 65 is supported on the vehicle body frame 10 so as to be swingable by being disposed on the bending deformation surface 61 positioned in parallel along the swinging surface 22 on which the engine swings. The fuel hose 64 that supplies fuel to the engine 30 does not require a large space, and the fuel hose 64 can be installed without touching the vehicle body.

  Further, since the bending deformation surface 61 is located at a predetermined interval from the engine 30, a work space is formed around the engine 30, and workability of inspection and maintenance of the engine 30, such as replacement of the ignition plug 35, can be improved. it can.

  Since the bending deformation portion 65 is formed in a concave arcuate shape toward the fuel tank 50, the fuel hose 64 can be disposed without concentrating unnecessary bending stress on the bending deformation portion 65. In addition, since the fuel hose 64 is arranged to be bent downward from the discharge port 53, the fuel hose 64 can be arranged in the lower floor portion of the vehicle, and the radius of curvature of the bending deformation portion 65 can be increased. Therefore, when the fuel hose 64 is bent, the fuel hose 64 is crushed or an increase in pipe resistance due to a small curvature radius can be prevented.

Since the vehicle body side hose clamp 68 is disposed at a position lower than the engine side hose clamp 67, the fuel tank 50, which is one of the parts that require the most volume among the parts installed in the vehicle, is disposed in the vehicle. Since it becomes easy to arrange in the lower part of the floor, the degree of freedom of layout when arranging other devices on the vehicle body can be increased. The bending deformation surface 61 is provided on the right side of the engine 30 suspended on the vehicle body frame 10. The fuel hose 64 can be easily disposed even when the power unit 20 is disposed on the left side of the vehicle by mounting the wide tire 43 on the rear wheel 41 by being positioned.

  Next, another aspect of the first embodiment of the present invention will be described. In the first embodiment, the fuel hose 64 is disposed on the right side of the vehicle of the engine 30 and is fixed to the vehicle body side hose clamp 68 provided on the right main frame 13R. In this aspect, as shown in FIG. The power unit 20 is configured such that the engine 30 is disposed on the right side of the vehicle, the fuel hose 64 is disposed in a space formed on the left side of the engine 30, and is fixed to a vehicle body side hose clamp 68 provided on the left main frame 13L. Is different.

  Since other configurations are the same as those of the first embodiment, the same reference numerals are given to the same components in the drawings, and description thereof will be omitted.

  Next, a second embodiment of the present invention will be described with reference to the drawings. In the present embodiment, as shown in FIG. 7, the fuel tank 50 is located above the rear portion of the engine 30.

  One end of the fuel hose 64 is disposed from the fuel tank 50 along the left main frame 13L toward the front of the vehicle, and is fixed by a vehicle body side hose clamp 68 provided on the left main frame 13L as a vehicle body side fixing portion. The other end communicates with the injector 63 through the portion 65 and the offset portion. The bending deformation portion 65 is located downstream of the fuel hose 64 with respect to the portion fixed by the vehicle body side hose clamp 68, and is parallel to the concave arcuate shape toward the fuel tank 50, that is, along the surface on which the engine swings. It is located on the bending deformation surface 61 and is curved so as to curve rearward from the upper side of the vehicle and return toward the fuel tank 50 so as to protrude toward the suspension portion 14.

  Since other configurations are the same as those of the first embodiment, the same reference numerals are given to the same components in the drawings, and description thereof will be omitted.

  Also in the second embodiment, the fuel hose 64 is bent by the operation similar to that of the first embodiment when the rear wheel 41 gets over the step and the engine side hose clamp 67 moves together with the cylinder head 31 downward in the vehicle. While the entire deforming portion 65 moves downward in the vehicle and curves toward the rear of the vehicle, the bending deforming portion 65 swings on the bending deforming surface 61 without swinging in the left-right direction of the vehicle. The fuel hose 64 can be installed without touching the vehicle body or the like without requiring a large space for installing the fuel hose 64 for supplying the fuel to the engine 30 that is swingably supported.

  In the present embodiment, since the fuel tank 50 is arranged above the engine 30 and the fuel can be supplied without using a fuel pump, the fuel is not pressurized and is supplied to the engine. The present invention can be applied to a fuel supply system. At that time, the fuel hose need only be connected to the bottom of the fuel tank.

It is a vehicle right view which shows the arrangement | positioning state of the fuel piping of 1st Embodiment of this invention. It is a principal part top view which shows the arrangement | positioning state of the fuel piping of 1st Embodiment. It is a principal part right view enlarged view which shows the movement of the fuel piping of 1st Embodiment. It is a principal part top view enlarged view of 1st Embodiment. It is a principal part enlarged view which shows the state which fixed the harness clamp to the engine side hose clamp. It is a principal part top view which shows another aspect of 1st Embodiment. It is a vehicle left view which shows 2nd Embodiment and shows the arrangement | positioning state of fuel piping.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Motorcycle 10 ... Body frame 14 ... Suspension part 22 ... Swing surface 30 ... Engine 50 ... Fuel tank 61 ... Deformation surface 62 ... Fuel piping 65 ... Deformation part 67 ... Engine side hose clamp (engine side fixed part)
68. Car body side hose clamp (car body side fixing part)

Claims (6)

In a fuel pipe arrangement structure for arranging a fuel pipe for supplying fuel from a fuel tank fixed to the body frame to an engine swingably supported on a suspension portion provided on the body frame,
The fuel pipe includes a flexible deformation portion formed between a vehicle body side fixing portion fixed to the vehicle body frame and an engine side fixing portion fixed to the engine, and having flexibility.
An arrangement structure of a fuel pipe, wherein the bending deformation portion is disposed on a bending deformation surface positioned in parallel along a surface on which the engine swings. In the fuel pipe arrangement structure according to claim 1,
The fuel pipe arrangement structure, wherein the bending deformation surface is located at a predetermined interval from the engine. In the fuel pipe arrangement structure according to claim 1 or claim 2,
An arrangement structure of a fuel pipe, wherein the bending deformation portion is formed in a curved shape that protrudes toward a suspension portion of the engine. In the fuel pipe arrangement structure according to claim 1 or 2,
An arrangement structure of a fuel pipe, wherein the vehicle body side fixing portion is arranged at a position lower than the engine side fixing portion. In the fuel pipe arrangement structure according to claim 4,
An arrangement structure of fuel piping, wherein the fuel tank is arranged in an under floor portion of a vehicle body. In the fuel pipe arrangement structure according to claim 1 or 2,
An arrangement structure of a fuel pipe, wherein the bending deformation surface is located on a right side of the engine suspended on the body frame.

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