JP4268001B2 - Vehicle fuel piping structure - Google Patents

Description

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

2. Description of the Related Art As a conventional fuel pipe structure for a vehicle, there is known a structure in which a fuel pipe is extended from a fuel tank provided below a step floor to an engine disposed behind the fuel tank (see, for example, Patent Document 1).
JP 2003-120450 A

FIG. 2 of Patent Document 1 will be described with reference to FIG. In addition, the code | symbol was reassigned.
FIG. 9 is a plan view showing a conventional fuel piping structure of a vehicle. An engine 202 and a fuel tank 203 arranged in front of the engine 202 are attached to a body frame 201, and a fuel supply unit 204 is integrated with the fuel tank 203. A fuel injection valve (not shown) is attached to the cylinder portion 206 of the engine 202 with a fuel connector 207, and a fuel take-out pipe 208 provided on the upper portion of the fuel supply unit 204 and a connection pipe (not shown) provided on the fuel connector 207. And that the fuel conduit 212 is connected.

  In the above technique, the fuel conduit 212 is elongated in the vehicle front-rear direction in order to reduce the deflection angle of the fuel conduit 212. However, since the fuel conduit 212 is long, the engine 202 is vertically oriented with respect to the body frame 201 (see FIG. The amount of up and down deflection of the fuel conduit 212 increases when the vehicle is swung in the front and back direction. Therefore, for example, it is necessary to provide the step floor at a high position so that the step floor provided above the fuel tank 203 does not interfere with the fuel conduit 212 swung upward. Furthermore, a space for swinging of the fuel conduit 212 must be provided around the fuel conduit 212, particularly in the vertical direction, and this space increases the size of the vehicle. In particular, it is difficult to secure such a space in a small vehicle.

  In addition, if the fuel conduit 212 is long, its weight increases, and a large force acts on the attachment portion of the fuel conduit 212 when the fuel conduit 212 swings. Therefore, the rigidity of the attachment portion is increased to support this force. It is necessary to increase the size, resulting in an increase in size and weight.

  SUMMARY OF THE INVENTION An object of the present invention is to reduce the amount of vibration of a fuel pipe in a vehicle fuel pipe structure to make the vehicle compact, and to reduce the acting force on the fuel pipe mounting portion, thereby reducing the size and weight. It is in.

According to a first aspect of the present invention, a power unit including an internal combustion engine main body composed of a cylinder and a cylinder head is swingably attached to the vehicle body frame with the cylinder head facing the front of the vehicle body, and attached to a fuel tank attached to the vehicle body frame. In a vehicle in which a fuel pump is connected, a fuel injection valve is provided in the intake passage of the internal combustion engine main body, and the fuel pump and the fuel injection valve are connected by a fuel pipe, the fuel pipe is connected around the internal combustion engine main body and The internal combustion engine side swing direction extending portion extending in the swing direction is provided at least, and a part of the internal combustion engine side swing direction extending portion is supported by a pipe support portion provided in the internal combustion engine main body portion, and the internal combustion engine side swing direction of the fuel pipe The extending portion and the vehicle body side swing direction extending portion are arranged so as to be arranged substantially in the left-right direction of the vehicle body .

When the power unit is swung, the internal combustion engine side swing direction extending portion of the fuel pipe is moved in the axial direction to suppress the swing amount of the internal combustion engine side swing direction extending portion in the swing direction.
Further, the amount of deflection of the internal combustion engine side swing direction extending portion is reduced to reduce the force acting on the pipe support portion.

Further, the internal combustion engine side swing direction extending portion and the vehicle body side swing direction extending portion are disposed substantially in the left-right direction of the vehicle body, and the distance between the internal combustion engine side swing direction extending portion and the vehicle body side swing direction extending portion is shortened. .

  According to a second aspect of the present invention, there is provided a vehicle body side swing direction extending portion extending in a swing direction from a vehicle body side hose support portion provided in the vehicle body, a vehicle body side swing direction extending portion, and an internal combustion engine side swing direction extending portion. And a U-shaped extending portion that extends in a U-shape along the outer surface of the cylinder head.

The vehicle body side swing direction extension portion and the internal combustion engine side swing direction extension portion are connected by a U-shaped extension portion, and when the power unit swings, the internal combustion engine side swing direction extension portion is substantially the same as the vehicle body side swing direction extension portion. The change in the curvature of the U-shaped extension is reduced by parallel translation .

According to a third aspect of the present invention, a vehicle includes a step floor on which a driver puts his / her foot in front of an internal combustion engine main body, a fuel tank is disposed below the step floor, and a fuel pump is disposed within the fuel tank. In addition, a fuel pump is attached to the upper wall of the fuel tank, the fuel pipe located above the fuel pump and below the step floor is made of metal or resin, and the U-shaped extension is made of rubber. And
The fuel pipe located above the fuel pump and below the step floor is made of metal or resin, suppresses vertical deflection of the fuel pipe, and lowers the step floor position.

The invention according to claim 4 is characterized in that a head cover is provided on the vehicle body front side of the cylinder head, and a pipe support portion is provided on each of the cylinder head and the head cover.
A pipe support part is provided in each of the cylinder head and the head cover, and when the head cover is removed for maintenance, the fuel pipe is supported by the pipe support part on the cylinder head side.

  In the invention according to claim 1, since the fuel pipe is provided with the internal combustion engine side swing direction extending portion, the internal combustion engine side swing direction extending portion of the fuel pipe moves in the axial direction when the power unit swings. The swing amount of the engine side swing direction extending portion in the swing direction can be suppressed. Therefore, the amount of vibration can be reduced as a whole fuel pipe, and the space where the fuel pipe can shake can be reduced, so that it is possible to arrange other parts close to the fuel pipe, and the vehicle is made compact. be able to.

  In addition, since the amount of deflection of the internal combustion engine side swing direction extending portion is reduced, the load acting on the piping support portion can be reduced, and the piping support portion can be reduced in size and weight.

Further, since the internal combustion engine side swing direction extending portion and the vehicle body side swing direction extending portion of the fuel pipe are arranged so as to be substantially aligned in the left and right direction of the vehicle body, the vehicle body of the internal combustion engine side swing direction extending portion and the vehicle body side swing direction extending portion is arranged. The distance in the front-rear direction can be shortened, the distance between the fuel tank and the internal combustion engine main body can be made closer, and the wheel base of the vehicle can be shortened.

In the invention according to claim 2, since the fuel pipe is provided with the vehicle body side swing direction extending portion and the U-shaped extension portion, the vehicle body side swing direction extending portion and the internal combustion engine side swing direction extending portion are connected to the U-shaped extension portion. When the power unit swings, the internal combustion engine side swing direction extension part moves substantially in parallel with the vehicle body side swing direction extension part, so that the change in the curvature of the U-shaped extension part is reduced. For example, in the present invention, the change in the bending rate of the fuel pipe is smaller than when the bending of the fuel pipe increases when one end of the straight fuel pipe moves with respect to the other end .

In the invention according to claim 3 , since the fuel pipe located above the fuel pump and below the step floor is made of metal or resin, it is possible to suppress the vertical swing of the fuel pipe, and the step floor is a fuel tank. The step floor can be lowered.

In the invention according to claim 4 , since the pipe support portion is provided in each of the cylinder head and the head cover, the fuel pipe can be supported by the pipe support portion on the cylinder head side when the head cover is removed for maintenance. The position of the fuel pipe can be held in the vicinity of the head cover attachment portion, and the workability when the fuel pipe is attached to the pipe support portion of the head cover can be improved again.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a side view of a vehicle according to the present invention. A vehicle 10 includes a vehicle body frame 11 having a front frame 12 and bolts 13... The power unit 17 (the engine 18 and the engine 18) is configured so that the fuel tank 16 is attached to the lower part of the front frame 12 and is substantially horizontal in the vehicle front-rear direction. And a power transmission mechanism 21 connected to the rear frame 14, and a rear part of the power unit 17 is attached to a rear part of the rear frame 14 via a rear cushion unit 23.

  Here, 31 is a head pipe attached to the front frame 12, 32 is a steering shaft rotatably supported by the head pipe 31, 33 is a front fork attached to the lower end of the steering shaft 32, and 34 is a lower end of the front fork 33. The attached front wheel, 36 is a bar handle attached to the upper end of the steering shaft 32, 37 is a front cover that covers the upper part of the front frame 12, 38 is a front fender that covers the front wheel 34, and 41 is disposed above the fuel tank 16. The step floor, 42 is a storage box attached to the upper part of the rear frame 14, 43 is a seat provided on the upper part of the storage box 42, and 44 is a body cover that covers the vehicle body below the seat 43.

Reference numeral 45 denotes a rear wheel attached to the rear portion of the power unit 17, 46 denotes a rear fender covering the upper portion of the rear wheel 45, 47 denotes a cylinder in which a piston (not shown) is movably accommodated, and 48 denotes a front portion of the cylinder 47. A cylinder head, 51 is a head cover that covers the end opening of the cylinder head 48, 52 is an intake device that extends backward from the top of the cylinder head 48, 53 is an exhaust device that extends backward from the bottom of the cylinder head 48, and 54 is a stand. .
The cylinder 47 and the cylinder head 48 (including the head cover 51) described above are members constituting the internal combustion engine main body 56.

  FIG. 2 is a side view of a main portion showing the fuel piping structure of a vehicle according to the present invention. A fuel pump 61 is attached to the inner side of the fuel tank 16 and to the upper wall 16a of the fuel tank 16, and The discharge port 61a is provided, one end of the fuel pipe 62 is connected to the fuel discharge port 61a, and the other end of the fuel pipe 62 is connected to the cylinder head 48 side of the engine 18.

  A part of the fuel pipe 62 passes between the fuel tank 16 and the step floor 41, and a part of the fuel pipe 62 passes between the fuel tank 16 and the head cover 51. Reference numeral 71 denotes a cap for closing the fuel filler port of the fuel tank 16, and 72 denotes a spark plug.

  FIG. 3 is a plan view of a principal part showing the fuel piping structure of the vehicle according to the present invention. The fuel piping 62 is connected to the tank side mounting member 81 connected to the fuel discharge port 61a and the tip of the tank side mounting member 81. A first resin hose 82 connected, a metal tube member 83 connected to the tip of the first hose 82, a rubber second hose 84 connected to the tip of the tube member 83, The engine side attachment member 86 is connected to the tip of the second hose 84.

  The tube member 83 is a member in which a plate piece 91 is integrally attached to a tube 88, and the plate piece 91 is attached to a vehicle body side attachment member 93 as a vehicle body side hose support portion with a bolt 92. Reference numeral 95 denotes a bolt for attaching the vehicle body side attachment member 93 to the front frame 12 (see FIG. 1).

The second hose 84 is a member that is supported midway by a first support member 97 as a pipe support part attached to the engine 18 side and a second support member 98 as a pipe support part.
The first support member 97 is attached to the first attachment portion 101 provided on the head cover 51 with a bolt 102, and the second support member 98 is attached to the second attachment portion 103 provided on the cylinder head 48 with a bolt 104. It is a thing.

  The engine side mounting member 86 connects the second hose 84 to the cylinder head 48, and also fixes the intake passage 48 a provided in the cylinder head 48 and the fuel injection valve 105 that injects fuel to the combustion chamber to the cylinder head 48. It is a member and is attached to the cylinder head 48 with bolts 106.

  Here, 111..., 112... Are bolts and nuts for attaching the fuel pump 61 to the fuel tank 16, 113 is a conducting wire for energizing the fuel pump 61, and 114... Are bolts for attaching the head cover 51 to the cylinder head 48. It is.

  FIG. 4 is a view taken in the direction of arrow 4 in FIG. 3, and the second hose 84 (the portion that has been cross-hatched for easy understanding of the shape) is substantially C-shaped in this view. A flexible portion 121 that is bent from the first support member 97 on the tube member 83 side and swings with the swing of the power unit 17 (see FIG. 1), and from the first support member 97 to the engine side mounting member 86 side. And a fixed portion 122 fixed to the engine 18.

The flexible portion 121 is provided in the vicinity of the connection portion with the tube member 83 and extends substantially in the vertical direction (that is, the swing direction of the cylinder head 48 and the head cover 51 in the power unit 17). A head cover side extending portion 125 as an internal combustion engine side swing direction extending portion provided in the vicinity of the support portion of the first support member 97 and extending substantially in the vertical direction, and the vehicle body side extending portion 124 and the head cover side extending portion 125. It consists of U-shaped extending part 126 made into the U shape connected integrally to each.
The vehicle body side extending portion 124 and the head cover side extending portion 125 are portions disposed substantially in the vehicle left-right direction.

  2 and 4, the second hose 84 is disposed around the cylinder head 48 and the head cover 51 and between the internal combustion engine main body 56 and the fuel tank 16, so that the cylinder head 48 and the head cover 51 are arranged. And the space between the internal combustion engine main body 56 (see FIG. 1) and the fuel tank 16 can be used effectively, and the vehicle 10 (see FIG. 1) can be made compact and small. Can do.

FIG. 5 is an explanatory view showing a fuel pipe according to the present invention.
The tank side mounting member 81 of the fuel pipe 62 includes a coupling portion 81a that secures sealing performance and is provided with a retaining mechanism by being fitted into one end of the fuel discharge port 61a (see FIG. 3). In order to connect to the first hose 82, a connecting portion 81b having a plurality of outer peripheral grooves into which a seal member is fitted is provided.

  The tube member 83 includes a connection portion 83 a in which a plurality of outer peripheral grooves into which a seal member is fitted in order to connect to the first hose 82 and a connection portion 83 b to connect to the second hose 84. Reference numeral 131 denotes a hose clamp for fastening the second hose 84.

The engine side attachment member 86 includes a connection portion 86 a for connecting to the second hose 84.
The first support member 97 and the second support member 98 include cylindrical portions 97a and 98a that fit into the second hose 84, and plate portions 97b and 98b that extend laterally from the cylindrical portions 97a and 98a, respectively. The plate parts 97b and 98b are attached to the head cover 51 and the cylinder head 48 shown in FIG.

Next, the operation of the fuel pipe structure described above will be described.
6A and 6B are operation diagrams showing the operation of the fuel piping structure according to the present invention.
(A) is the second hose 84 when the engine swings with respect to the vehicle body frame and the head cover 51 moves upward from the position shown in FIG. 121. The same shall apply hereinafter) shows a bent state. Reference numeral 141 denotes a point on the head cover 51 before moving, and reference numeral 142 denotes a point after the point 141 moves with the movement of the head cover 51. In addition, the imaginary line in a figure shows the flexible part 121 before bending. (The same applies to (b) below.)

  The head cover side extending portion 125 of the second hose 84 moves substantially parallel to the vehicle body side extending portion 124 and substantially in the axial direction of the head cover side extending portion 125, and the change in the curvature of the U-shaped extending portion 126 is small.

  (B) is a state in which the second hose 84, specifically, the flexible portion 121 is bent when the engine swings with respect to the vehicle body frame and the head cover 51 moves downward by the movement amount M2 from the position shown in FIG. Indicates. Reference numeral 143 denotes a point after the point 141 has moved with the movement of the head cover 51.

  The head cover side extending portion 125 of the second hose 84 moves substantially parallel to the vehicle body side extending portion 124 and substantially in the axial direction of the head cover side extending portion 125 as in the case of FIG. There is little change in the curvature of the portion 126.

  As described in (a) and (b) above, when the head cover side extending portion 125 moves in the axial direction, the head cover side extending portion 125 itself hardly bends up and down, and the Since the mounting length L1 in the left and right direction of the vehicle body (that is, the vehicle width direction), that is, the distance L1 between the vehicle body side extending portion 124 and the head cover side extending portion 125 is small, the vertical deflection amount of the U-shaped extending portion 126 is small. As a result, the deflection amount of the flexible portion 121 as a whole is reduced.

  Therefore, a large force does not act in the vertical direction on the vehicle body side mounting member 93 that is the mounting portion on the vehicle body frame 11 side of the second hose 84 and the first support member 97 that is the mounting portion on the engine 18 side. It is not necessary to increase the rigidity of the vehicle body side mounting member 93 and the first support member 97, and the vehicle body side mounting member 93 and the first support member 97 can be reduced in size and weight.

7A to 7C are operation diagrams showing the operation of the comparative example of the fuel pipe.
(A) shows that the fuel pipe 223 is connected linearly between the discharge pipe 221 attached to the fuel pump side and the suction pipe 222 attached to the engine side.

(B) shows a state in which the engine swings, the suction pipe 222 moves downward by a movement amount M3, and one end of the fuel pipe 223 is bent downward.
At this time, the fuel pipe 223 is largely bent in the vicinity of the connection portion of the fuel pipe 223 to the discharge pipe 221 and the vicinity of the connection portion of the fuel pipe 223 to the suction pipe 222, that is, a bending load acts on the fuel pipe 223.

  Here, when the attachment length of the fuel pipe 223, that is, the distance between the discharge pipe 221 and the suction pipe 222 is L2, in order to reduce the bending angle of the fuel pipe 223, as shown in FIG. The attachment length L3 of the fuel pipe 223 may be made larger than L2. However, when the attachment length L3 is increased, when the intake pipe 222 moves downward, the deflection amount B of the fuel pipe 223 increases, and the weight of the fuel pipe 223 increases and the fuel pipe 223 swings. In addition, the force acting on the discharge pipe 221 and the suction pipe 222 is increased.

  Thus, when the fuel pipe 223 is attached in a straight line, the attachment length L2 is larger than the attachment length L1 (see FIG. 6A) of the second hose 84 of the present invention (see FIG. 6A). The fuel pipe 223 becomes larger and the amount of deflection of the fuel pipe 223 increases, and a large force acts on the mounting portion of the fuel pipe 223. In the present invention, these points can be improved.

  As described above with reference to FIGS. 1, 3, and 4, the present invention first includes the power unit 17 including the internal combustion engine main body 56 including the cylinder 47 and the cylinder head 48, and the cylinder head 48 in front of the vehicle body. The fuel pump 61 (see FIG. 2) is connected to the fuel tank 16 attached to the vehicle body frame 11 so that the fuel injection valve 105 is directed to the intake passage 48a of the internal combustion engine main body 56. In the vehicle 10 in which the fuel pump 61 and the fuel injection valve 105 are connected by the fuel pipe 62, as described with reference to FIG. 4, the fuel pipe 62 is provided around the internal combustion engine main body 56 (see FIG. 1). At least a head cover side extending portion 125 extending in the swing direction is provided, and a part of the head cover side extending portion 125 is provided in the internal combustion engine main body portion 56. Characterized by being supported by the first support member 97 and the second support member 98.

  Since the fuel pipe 62 is provided with the head cover side extending portion 125, when the power unit 17 swings, the head cover side extending portion 125 of the fuel pipe 62 moves in the axial direction. The amount can be reduced. Therefore, the amount of vibration of the fuel pipe 62 as a whole can be reduced, and the space in which the fuel pipe 62 shakes can be reduced, that is, it becomes possible to arrange other parts close to the fuel pipe 62, and the vehicle 10 (see FIG. 1) can be made compact.

  Further, since the amount of deflection of the head cover side extending portion 125 is reduced, the force acting on the first support member 97 and the vehicle body side support member 93 can be reduced, and the first support member 97 and the vehicle body side support member 93 can be reduced. It is not necessary to increase the strength and rigidity, and the first support member 97 and the vehicle body side support member 93 can be reduced in size and weight.

  The present invention secondly connects the vehicle body side extending portion 124 extending in the swing direction from the vehicle body side mounting member 93 provided on the vehicle body, and the vehicle body side extending portion 124 and the head cover side extending portion 125 to the fuel pipe 62. And a U-shaped extension 126 extending in a U-shape along the outer surface of the cylinder head 48.

  Since the fuel pipe 62 includes the vehicle body side extending portion 124 and the U-shaped extending portion 126, the vehicle body side extending portion 124 and the head cover side extending portion 125 are connected by the U-shaped extending portion 126, whereby the power unit 17 ( 1), the head cover side extending portion 125 moves substantially in parallel with the vehicle body side extending portion 124, so that the change in the curvature of the U-shaped extending portion 126 can be reduced. In the present invention, the change in the bending rate of the fuel pipe 62 can be reduced as compared with the case where the change in the bending of the fuel pipe increases when one end of the straight fuel pipe moves with respect to the other end.

Thirdly, the present invention is characterized in that the head cover side extending portion 125 and the vehicle body side extending portion 124 of the fuel pipe 62 are arranged so as to be arranged substantially in the left-right direction of the vehicle body.
Since the head cover side extending portion 125 and the vehicle body side extending portion 124 of the fuel pipe 62 are arranged so as to be substantially aligned in the left and right direction of the vehicle body, the distance in the vehicle body longitudinal direction between the head cover side extending portion 125 and the vehicle body side extending portion 124 is shortened. 1, the distance between the fuel tank 16 and the internal combustion engine main body 56 can be made closer, and the wheel base of the vehicle 10 can be shortened.

  Fourthly, according to the present invention, as described with reference to FIGS. 1 and 2, the vehicle 10 includes the step floor 41 on which the driver puts his / her foot in front of the internal combustion engine main body 56, and the fuel is disposed below the step floor 41. A fuel tank 61 is disposed, a fuel pump 61 is disposed in the fuel tank 16, and a fuel pump 61 is attached to the upper wall 16 a of the fuel tank 16. The fuel is located above the fuel pump 61 and below the step floor 41. The piping, that is, the tank side mounting member 81 and the first hose 82 are made of metal, the tube member 83 is made of resin, and the U-shaped extending portion 126 (see FIG. 4) is made of rubber.

  Since the fuel pipe 62 located above the fuel pump 61 and below the step floor 41 is made of metal or resin, the vertical swing of the fuel pipe 62 can be suppressed, and the step floor 41 is placed on the fuel tank 16 side. The step floor 41 can be lowered.

  In the fifth aspect of the present invention, as described with reference to FIG. 3, the head cover 51 is provided on the front side of the cylinder head 48 in the vehicle body, and the first support member 97 and the second support member 98 are provided on each of the cylinder head 48 and the head cover 51. It is provided.

  Since the first support member 97 is provided on the head cover 51 and the second support member 98 is provided on the cylinder head 48, when the head cover 51 is removed for maintenance, the fuel pipe 62 is connected by the second support member 98 on the cylinder head 48 side. Since the fuel pipe 62 can be supported, the position of the fuel pipe 62 can be held in the vicinity of the mounting portion of the head cover 51, and workability when the fuel pipe 62 is attached to the first support member 97 of the head cover 51 can be improved again. .

FIG. 8 is a side view of a main part showing another embodiment of the vehicle according to the present invention, and shows a vehicle 150 having a fuel tank 148 attached to the rear part of the rear frame 14. In addition, the same code | symbol is attached | subjected about the same structure as embodiment shown in FIG. 1, and detailed description is abbreviate | omitted.
3 and 8, the fuel pipe 151 for guiding the fuel from the fuel tank 148 to the engine 18 has a first end connected to a fuel pump (not shown) on the fuel tank 148 side and the other end connected to the tube member 152. The hose 153 includes the above-described tube member 152, the second hose 84 connected to the tube member 152, and the engine-side mounting member 86 described above.
The tube member 152 is attached to the vehicle body side attachment member 93.

  In the present embodiment, as shown in FIG. 4, the flexible portion 121 of the fuel pipe 62 has a U-shape that protrudes downward. However, the present invention is not limited to this, and may have a U-shape that protrudes upward. .

  The vehicle fuel piping structure of the present invention is suitable for a two-wheeled vehicle.

1 is a side view of a vehicle according to the present invention. It is a principal part side view which shows the fuel piping structure of the vehicle which concerns on this invention. It is a principal part top view which shows the fuel piping structure of the vehicle which concerns on this invention. FIG. 4 is a view taken along arrow 4 in FIG. 3. It is explanatory drawing which shows the fuel piping which concerns on this invention. It is an action figure which shows the effect | action of the fuel piping structure which concerns on this invention. It is an effect | action figure which shows the effect | action of the comparative example of fuel piping. It is a principal part side view which shows another embodiment of the vehicle which concerns on this invention. It is a top view which shows the fuel piping structure of the conventional vehicle.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Vehicle, 11 ... Body frame, 16 ... Fuel tank, 16a ... Upper wall, 17 ... Power unit, 18 ... Engine, 41 ... Step floor, 47 ... Cylinder, 48 ... Cylinder head, 48a ... Intake passage, 51 ... Head cover, 56 ... Internal combustion engine main body, 61 ... Fuel pump, 62 ... Fuel piping, 93 ... Car body side hose support (vehicle body side mounting member), 97, 98 ... Pipe support parts (first support member, second support member), 124... Swing direction extending portion on the vehicle body side (vehicle body side extending portion) 125... Swing direction extending portion on the internal combustion engine side (head cover side extending portion). 126.

Claims (4)

A power unit including an internal combustion engine main body composed of a cylinder and a cylinder head is swingably attached to the vehicle body frame with the cylinder head facing the front of the vehicle body, a fuel pump is connected to a fuel tank attached to the vehicle body frame, In a vehicle in which 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 by a fuel pipe.
The fuel pipe includes at least an internal combustion engine side swing direction extending portion extending in the swing direction around the internal combustion engine main body portion, and a pipe in which a part of the internal combustion engine side swing direction extending portion is provided in the internal combustion engine main body portion. Supported by the support,
The fuel pipe structure for a vehicle, wherein the fuel pipe is arranged so that the internal combustion engine side swing direction extending portion and the vehicle body side swing direction extending portion are arranged substantially in the left-right direction of the vehicle body.   The fuel pipe connects a vehicle body side swing direction extending portion extending in a swing direction from a vehicle body side hose support portion provided on the vehicle body, and connects the vehicle body side swing direction extending portion and the internal combustion engine side swing direction extending portion. 2. The fuel piping structure for a vehicle according to claim 1, further comprising a U-shaped extending portion extending in a U-shape so as to follow the outer surface of the cylinder head. The vehicle includes a step floor on which a driver puts feet in front of the internal combustion engine main body, the fuel tank is disposed below the step floor, the fuel pump is disposed in the fuel tank, and the fuel tank The fuel pump is attached to an upper wall of the fuel pump, the fuel pipe located above the fuel pump and below the step floor is made of metal or resin, and the U-shaped extension is made of rubber. claim 1 or claim 2 Symbol placement of the fuel piping structure of the vehicle. 4. The vehicle fuel according to claim 1 , wherein the cylinder head includes a head cover on a front side of the vehicle body, and the pipe support portion is provided on each of the cylinder head and the head cover. 5. Piping structure.

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