JP2005138712A - Fuel supply equipment for scooter type motorcycle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel supply equipment for a scooter type motorcycle in which a fuel pump can be reasonably installed inside a fuel tank behind an article storage box with excellent maintainability. <P>SOLUTION: In the fuel supply equipment for the scooter type motorcycle, a power unit 7 is provided below an article storage box 6 below a seat 4 with a rear portion thereof in a vertically rocking manner, a rear wheel 8 is supported by a rear portion of the power unit 7. A fuel tank 28 is provided behind the article storage box 6 and above the rear wheel 8. A mounting part of a fuel tank built-in type fuel pump 29 is provided on a front side of the fuel tank 28 adjacent to a rear side of the article storage box 6. The rear side of the article storage box 6 is formed to be a substantially flat surface rising upwardly and backwardly in the diagonal direction above the rear wheel 8. The front side of the fuel tank 28 is arranged along the back side of the article storage box 6. The fuel tank 28 is formed in a shape in side view of the motorcycle so that a bottom surface is longer than an upper surface, and a fuel filling port 34 is formed in the upper surface. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a fuel supply device for a scooter type motorcycle in which a fuel pump is installed inside a fuel tank and fuel is supplied to the engine side by the fuel pump.

  In a scooter type motorcycle in which an article storage box is provided below a seating seat, the fuel tank is often disposed below the step board or behind the article storage box.

  In the case where fuel is supplied from the fuel tank of such a scooter type motorcycle to the engine side using a fuel pump, it is desirable in terms of layout that the fuel pump is provided inside the fuel tank and unitized with the fuel tank.

In that case, as shown in Patent Document 1, a flat portion is formed on the upper surface (or bottom surface) of the fuel tank, a fuel pump is attached to the flat portion, and the fuel suction portion provided at the lower portion of the fuel pump is connected to the fuel tank. Open the bottom and suck in fuel. In patent document 1, the fuel tank is arrange | positioned under the step board.
JP 2003-127948 A

  However, in the scooter type motorcycle in which the fuel tank is arranged behind the article storage box, the area of the upper surface of the fuel tank is very limited, and it is necessary to provide a fuel inlet there. The area that can be installed cannot be taken. On the other hand, since the bottom surface of the fuel tank is located immediately above the rear wheel, it is necessary to provide a concave shape that avoids the rear wheel, and it is difficult to form a flat surface for installing the fuel pump.

  Therefore, as shown in FIG. 4, the fuel pump 103 is installed outside the fuel tank 102, such as below the fuel tank 102 disposed behind the article storage box 101, or the fuel pump is omitted. .

  However, if a fuel pump is installed outside the fuel tank, the degree of freedom in the layout of the parts inside the vehicle body becomes significantly worse. Further, if the fuel pump is omitted, the fuel supply tends to become unstable when the remaining amount of fuel is low, and it becomes difficult to adopt the fuel injection method.

  When the fuel pump is provided inside the fuel tank, there is another problem that the maintainability of the fuel pump is deteriorated.

  The present invention has been made in order to solve the above-described problems. A fuel pump can be installed comfortably and with good maintainability inside a fuel tank disposed behind an article storage box, and the fuel can be stabilized to the end. Another object of the present invention is to provide a fuel supply device for a scooter type motorcycle that can widen the opening of the article storage box and facilitate loading and unloading of articles.

  In order to achieve the above object, a fuel supply device for a scooter type motorcycle according to the present invention is provided with an article storage box below a seating seat as described in claim 1, and the article storage box. A power unit including an engine and a power transmission device is provided below the rear of the power unit so as to be swingable up and down, a rear wheel is supported at the rear of the power unit, a fuel tank is provided behind the article storage box and above the rear wheel, and an article storage box. A fuel tank built-in type fuel pump mounting portion is provided on the front surface of the fuel tank adjacent to the rear surface.

  According to a second aspect of the present invention, the rear surface of the article storage box is formed into a substantially flat surface that rises obliquely upward rearward above the rear wheel, and the front surface of the fuel tank is a rear surface of the article storage box. The fuel tank is formed so that the bottom surface is longer than the top surface of the vehicle as viewed from the side of the vehicle, and a fuel inlet is provided on the top surface of the fuel tank.

  Furthermore, as described in claim 3, the deepest portion is formed in the front bottom portion of the fuel tank, and the fuel suction portion of the fuel pump attached to the front surface of the fuel tank is opened to the deepest portion. To do.

  And as described in Claim 4, the deepest part of the said fuel tank was provided in the other side of the rear wheel with respect to the cushion unit for the power unit buffer suspension provided in the one side of the rear wheel. .

  According to a fifth aspect of the present invention, the article storage box is formed such that a full-face helmet is stored with its bottom inclined rearward and upward.

  In the case of the structure of the first aspect, since the front surface of the fuel tank can be formed in a relatively free shape, the front surface is formed into a flat surface to form the installation portion of the fuel pump, thereby forming the inside of the fuel tank. The fuel pump can be installed without difficulty, and if the article storage box is removed, the installation portion of the fuel pump is exposed, so that the maintainability of the fuel pump can be improved.

  According to the configuration of the second aspect, since the rear surface of the article storage box rises obliquely upward rearward, the opening of the article storage box can be widened to facilitate loading and unloading of articles, and at the same time the front surface of the fuel tank is Since the inclined surface rises obliquely upward, the maintainability of the fuel pump can be further enhanced.

  According to the configuration of the third aspect, the fuel in the fuel tank can be stably sucked into the fuel pump and supplied to the engine side. In particular, air bubbles can be prevented from being sucked during deceleration when the remaining amount of fuel is low.

  According to the configuration of the fourth aspect, the deepest portion of the fuel tank is formed deeper, so that the fuel can be stably supplied to the end even when the remaining amount of fuel is small.

  According to the fifth aspect of the present invention, the front surface of the fuel tank can be formed in a wider area to improve the installation and maintainability of the fuel pump, and the helmet and other articles can be easily taken in and out.

  The following is an embodiment of the present invention.

  FIG. 1 is a left side view showing an example of a scooter type motorcycle to which a fuel supply device according to the present invention is applied, and FIG. 2 is an internal structure diagram of a rear part of a vehicle body of the scooter type motorcycle.

  The scooter type motorcycle 1 is provided with a low floor step board 5 on which a foot is placed between a handle bar 3 for steering the front wheel 2 and a seating seat 4, and an article storage box 6 is provided below the seating seat 4. In addition, a power unit 7 is provided below the article storage box 6, and a rear wheel 8 is supported on the rear part of the power unit 7, and has a general vehicle body configuration as a scooter type motorcycle.

  The power unit 7 has a general configuration in which an engine 11 and a power transmission device 12 are integrally formed. A cylinder 13 of a single cylinder engine 11 extends substantially horizontally toward the front, and the power transmission device 12 is an engine. A rear wheel 8 is pivotally supported on the right side surface of the rear part of the rear portion 11 extending rearward from the left side surface.

  A V-belt continuously variable transmission and a reduction gear mechanism are built in the power transmission device 12, and the power of the engine 11 is shifted and decelerated and transmitted to the rear wheel 8. A carburetor (or fuel injection device) 14 is provided above the engine 11, and an air cleaner 15 connected to the carburetor (or fuel injection device) 14 is installed on the upper portion of the power transmission device 12 (on the left side of the rear wheel 8).

  As shown in FIG. 2, a suspension portion 17 provided on the upper portion of the engine 11 of the power unit 7 is connected to a suspension bracket 19 provided on an intermediate portion of the vehicle body frame 18 via a link 20 so that the rear portion of the power unit 7 is vertically moved. It can swing. The rear cushion unit 23 is connected between the cushion bracket 22 provided at the rear portion of the vehicle body frame 18 and the rear portion of the power transmission device 12. When the scooter type motorcycle 1 travels, the rear wheel 8 swings up and down together with the power unit 7 according to the unevenness of the traveling road surface, and the cushion unit 23 expands and contracts to buffer the swing shock of the rear wheel 8.

  The article storage box 6 provided below the seating sheet 4 is formed in a bottomed box shape that opens upward as shown in FIG. The front surface 6 a of the article storage box 6 is a substantially vertical wall surface, the bottom surface 6 b is a horizontal surface, and the rear surface 6 c is a substantially flat surface that rises obliquely upward rearward above the rear wheel 8.

  In this article storage box 6, a full-face helmet 25 is stored with its bottom inclined rearward and upward. The bottom surface of the helmet 25 rises obliquely upward and tilts rearward and upward along the rear surface 6c of the article storage box 6 formed in a substantially flat surface.

  The seating sheet 4 can be opened by lifting the rear part around a hinge portion 26 provided at the front upper part of the article storage box 6. The seating sheet 4 is opened and articles are put in and out of the article storage box 6. The article storage box 6 has a front lower portion, a rear upper portion, and the like fixed to the vehicle body frame 18 by a plurality of bolts 27...

  A fuel tank 28 and a fuel pump 29 constituting the fuel supply device according to the present invention are provided behind the article storage box 6 and above the rear wheel 8, and the article storage box 6 and the fuel tank 28 are made of resin. Covered by a body cover 31. The front lower part of the body cover 31 continues smoothly to the step board 5, and the front part of the step board 5 continues to the leg shield 32 that covers the front part of the body frame 18.

  The fuel tank 28 has, for example, a structure in which upper and lower tank halves 28a and 28b are welded in the middle, but may be integrally formed by, for example, blow molding a resin material. The front surface 28c of the fuel tank 28 has a flat slope shape adjacent to the rear surface 6c of the article storage box 6, the rear surface 28d has a substantially vertical wall surface, and the fuel tank 28 has a bottom surface 28f rather than the upper surface 28e in a side view of the vehicle. Is formed long, and a fuel injection port 34 is provided on the upper surface 28e. The fuel inlet 34 is accessed by opening a lid 35 (see FIG. 1) provided on the upper surface of the rear portion of the body cover 31.

  The bottom surface 28f of the fuel tank 28 is formed with a recess 28g that avoids the rotation trajectory of the rear wheel 8, and the front portion thereof, that is, the front bottom portion of the fuel tank 28 is the deepest portion 28h. The deepest portion 28h is provided on the opposite side of the rear wheel 8, that is, on the right side (right side) with respect to the cushion unit 23 and the air cleaner 15 provided on the left side of the rear wheel 8.

  A circular opening-shaped pump mounting portion 28 i is provided at a substantially central portion of the front surface 28 c of the fuel tank 28, and a fuel pump 29 is mounted here. The fuel pump 29 is a fuel tank built-in type.

  In the fuel pump 29, a disk-like mounting flange 29b is obliquely provided on an upper part of a vertical cylindrical pump body 29a, and a fuel suction part 29c also serving as a strainer is connected to a lower part of the pump body 29a. The pump body 29 a is inserted into the pump mounting portion 28 i of the fuel tank 28 from above, and the mounting flange 29 b is overlapped on the upper surface of the pump mounting portion 28 i with the sealing gasket 37 interposed therebetween, and fastened with several bolts 38. The pump body 29a hangs down from the pump mounting portion 28i to the inside of the fuel tank 28, and the fuel suction portion 29c extends forward from the lower portion of the pump body 29a and opens into the deepest portion 28h of the fuel tank 28.

  A fuel supply hose 39 extends from the upper part of the fuel pump 29, and the other end is connected to the carburetor (or fuel injection device) 14. When the fuel pump 29 is activated, the fuel in the fuel tank 28 is sucked into the pump body 29a from the fuel suction portion 29c, discharged at a predetermined pressure, and passed through the fuel supply hose 39 and the carburetor (fuel injection device) 14 to the engine 11 side. Supplied.

  The pump body 29a of the fuel pump 29 is provided with a float 29d that rotates up and down in the fuel tank 28. The float 29d moves up and down according to the fuel liquid level in the fuel tank 28, and near the handlebar 3 The remaining amount of fuel is displayed on a fuel gauge (not shown) provided at.

  In the fuel supply device configured as described above, the front surface 28c of the fuel tank 28 is adjacent to the rear surface 6c of the article storage box 6, and a pump mounting portion 28i is provided on the front surface 28c, where a fuel pump with a built-in fuel tank is provided. 29 is installed, the front surface 28c of the fuel tank 28 that can be shaped in a relatively free shape is formed on a wide flat surface, and the pump mounting portion 28i that is the installation portion of the fuel pump 29 is formed without difficulty. As a result, the fuel pump 29 can be reliably installed inside the fuel tank 28.

  In addition, if the article storage box 6 is removed from the vehicle body, the pump mounting portion 28i, which is the installation portion of the fuel pump 29, is exposed to the outside. Therefore, it is not necessary to remove the fuel tank 28 when the fuel pump 29 is serviced. Maintainability is extremely high.

  Further, since the rear surface 6c of the article storage box 6 is formed as a substantially flat surface that rises obliquely upward rearward above the rear wheel 8, the opening of the article storage box 6 can be made extremely wide to facilitate the insertion and removal of articles. it can.

  The front surface 28c of the fuel tank 28 is inclined rearwardly along the rear surface 6c of the article storage box 6, and the fuel tank 28 has a bottom surface 28f longer than the upper surface 28e in a side view of the vehicle, and the upper surface 28e of the fuel tank 28. Therefore, the maintainability of the fuel pump 29 can be further improved by making the front surface 28c of the fuel tank 28 inclined obliquely upward and rearward without impairing the capacity of the fuel tank 28.

  Further, since the article storage box 6 has a shape in which the full-face helmet 25 is stored with the bottom surface inclined rearward and upward, the front surface 28c of the fuel tank 28 is formed on a flat surface with a larger area, and the fuel pump. 29 can be easily installed and maintained, and the helmet 25 and other articles can be easily taken in and out.

  Further, the deepest part 28h of the fuel tank 28 is provided on the front bottom part of the fuel tank 28 and on the opposite side (right side) of the rear wheel 8 with respect to the cushion unit 23 and the air cleaner 15 provided on the left side of the rear wheel 8. Since the fuel suction portion 29c of the fuel pump 29 is opened at the deepest portion 28h, the deepest portion 28h is formed deeper, and even when the remaining amount of fuel is small, the fuel is stably sucked into the fuel pump 29 until the end. Can be supplied to the side. In particular, it is possible to effectively prevent air bubbles from being sucked into the intake fuel during deceleration when the remaining amount of fuel is low.

1 is a left side view showing an example of a scooter type motorcycle to which a fuel supply device according to the present invention is applied. The internal structure figure of the vehicle body latter half part of the scooter type motorcycle which shows one Embodiment of this invention. The longitudinal section of an article storage box and a fuel tank. The internal structure figure of the vehicle body latter half part of the scooter type motorcycle which shows the prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Scooter type motorcycle 4 Seating seat 6 Goods storage box 6c Rear side of goods storage box 7 Power unit 8 Rear wheel 11 Engine 12 Power transmission device 14 Carburetor or fuel injection device 18 Body frame 23 Cushion unit 25 Full face helmet 28 Fuel tank 28c Fuel tank front surface 28d Fuel tank rear surface 28e Fuel tank upper surface 28f Fuel tank bottom surface 28h Fuel tank deepest portion 28i Pump mounting portion 29 Fuel pump 29a Pump body 29b Mounting flange 29c Fuel suction portion 29d Float 34 Fuel inlet 39 Fuel supply hose

Claims (5)

An article storage box is provided below the seating seat, a power unit including an engine and a power transmission device is provided below the article storage box so as to be swingable up and down, and a rear wheel is supported at the rear part of the power unit. A fuel for a scooter type motorcycle having a fuel tank provided at the rear and above the rear wheel, and a fuel pump mounting portion built in the fuel tank provided in front of the fuel tank adjacent to the rear surface of the article storage box Feeding device. The rear surface of the article storage box is formed as a substantially flat surface that rises obliquely upward rearwardly above the rear wheel, and the fuel tank is viewed from the side of the vehicle with the front surface of the fuel tank aligned with the rear surface of the article storage box. 2. The fuel supply device for a scooter type motorcycle according to claim 1, wherein the bottom surface is longer than the upper surface, and a fuel injection port is provided on the upper surface of the fuel tank. The scooter type according to claim 1 or 2, wherein a deepest portion is formed in a front bottom portion of the fuel tank, and a fuel suction portion of a fuel pump attached to a front surface of the fuel tank is opened to the deepest portion. Motorcycle fuel supply system. 4. The scooter type motorcycle according to claim 3, wherein the deepest portion of the fuel tank is provided on the opposite side of the rear wheel with respect to a cushion unit for a power unit shock suspension provided on one side of the rear wheel. Fuel supply device. The fuel supply device for a scooter type motorcycle according to claim 1 or 2, wherein the article storage box is formed so that a full-face helmet is stored with its bottom inclined rearward and upward.

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