JPH07291169A - Installation structure for resin fuel tank for motorcycle - Google Patents

Abstract

PURPOSE:To facilitate the mounting and demounting of a fuel tank with the simple structure. CONSTITUTION:As for a motorcycle which is constituted so that a vehicle body frame 12 is equipped with a tank rail 15 extending rearward from a head pipe, tank tube 19 extending a slantly downward from the head pipe, and a reinforcing plate 32 laid on the tank rail 15 and the tank tube 19, and a fuel tank 21 which is shaped integrally out of plastic resin is installed, riding over the tank rail 15, a fuel tank installation plate 34 is installed integrally on the riding-over part 33 of the fuel tank 21. The installation plate 34 is equipped with a U-shaped cut part 39 which is opened to the front part of the fuel tank 21, and a fuel tank installation part 36 is formed on the reinforcing plate 32, and the cut part 39 of the installation plate 34 is fitted on the installation part 36.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin fuel tank mounting structure for a motorcycle.

[0002]

2. Description of the Related Art Fuel tanks used in motorcycles are conventionally made of metal or resin.
In particular, those made of resin are generally molded integrally by blow molding or rotational molding of plastic resin, and because they are lightweight and have a high degree of freedom in shape, they are competition vehicles, especially off-road motorcycles. Is often used in.

FIG. 7 is a side view showing a conventional mounting structure of this resin fuel tank, and FIG. 8 is a view taken along line VIII-VIII of FIG.
It is sectional drawing which follows the line.

As shown in FIG. 7, since the fuel tank 1 is laid across the tank rail 3 of the vehicle body frame 2, an inverted U-shaped ridge 4 is formed in the lower portion thereof. Fuel tank mounting plates 5 are integrally or integrally provided on both side surfaces of the straddle portion 4 so as to project to the front portion of the fuel tank 1.

On the other hand, as shown in FIG.
, For example, fuel tank mounting brackets 7 are provided on both sides of the reinforcing plate 6, and the fuel tank mounting plate 5 is provided with bolts 9 and nuts 10 on the brackets 7 via cushion members 8 made of an elastic body such as rubber. It is fixed at. In addition,
In FIG. 8, only the fuel tank mounting bracket 7 on one side of the reinforcing plate 6 is shown, and the other side is symmetrical and is omitted.

[0006]

However, when it is necessary to remove the fuel tank for various maintenance or the like, the fuel tank cannot be removed unless bolts are removed from the fuel tank mounting brackets on both sides, which is time-consuming and troublesome. Met. In addition, mounting the fuel tank is similarly troublesome.

In particular, during the off-road competition, it is desired to attach and detach the fuel tank easily in a short time.

The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a resin fuel tank mounting structure for a motorcycle, which has a simple structure and allows the fuel tank to be easily attached and detached.

[0009]

[MEANS FOR SOLVING THE PROBLEMS] In order to solve the above-mentioned problems, a mounting structure for a resin fuel tank for a motorcycle according to the present invention, as set forth in claim 1, is a tank extending rearward from a head pipe. A fuel tank integrally formed with a plastic resin, having a rail, a down tube that extends obliquely downward from the head pipe, and a reinforcing plate that is installed on the tank rail and the down tube. In a motorcycle straddling a tank rail, a fuel tank mounting plate is integrally or integrally provided on a straddling portion of the fuel tank, and the mounting plate has a U-shaped notch opening toward the front of the fuel tank. On the other hand, a fuel tank mounting portion is provided on the reinforcing plate, and a notch portion of the mounting plate is fitted and inserted into the mounting portion.

[0010]

In the present invention having the above-mentioned structure, the tank rail extending rearward from the head pipe, the down tube extending obliquely downward from the head pipe, and the reinforcing plate installed on the tank rail and the down tube. In a motorcycle having a vehicle body frame provided with, a fuel tank integrally formed of a plastic resin astride on the tank rail, a fuel tank mounting plate is integrally or integrally provided on the straddle of the fuel tank, This mounting plate is provided with a U-shaped notch opening toward the front of the fuel tank, while the reinforcing plate is provided with a fuel tank mounting part, and the notch part of the mounting plate is fitted into this mounting part. The fuel tank can be easily attached and detached with a simple structure.

[0011]

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

FIG. 1 is a left side view showing a motorcycle to which the present invention is applied.

The motorcycle 11 has a body frame 12, and an engine 13 is mounted on the lower center of the body frame 12.

FIG. 2 is a left side view of the vehicle body frame 12.

As shown in FIGS. 1 and 2, the body frame 12 is, for example, a semi-double cradle type,
Head pipe 14, tank rail 15, subframe 1
6, a seat rail 17, a side pipe 18, a down tube 19 and an under tube 20.

A tank rail 15 extends obliquely rearward from the upper rear portion of the head pipe 14, and sub-frames 16 are connected to the left and right at the rear end of the tank rail 15, and these sub-frames 16 are downward. Extend. A seat rail 17 is connected to the rear end of the tank rail 15 and extends rearward, and a side pipe 18 extends forward and downward from the vicinity of the central portion of the seat rail 17 to form a subframe 1.
6 Connected to the lower center.

On the other hand, a down tube 19 extends obliquely downward from the lower rear portion of the head pipe 14, and an under tube 20 is connected to the lower portion of the down tube 19. The undertube 20 is divided into two forks in the width direction, extends downward, is bent midway and extends rearward, and then is connected to the lower end of the subframe 16.

As shown in FIG. 1, a fuel tank 21 is installed above the tank rail 15. An operation seat 22 is installed above the seat rail 17. Further, the head pipe 14 is provided with a steering mechanism 23. The steering mechanism 23 is provided with a front fork 25 that rotatably supports the front wheels 24.
The front fork 25 is fixed in parallel by an upper bracket 26 and a lower bracket 27 of the steering mechanism 23. A handlebar 28 is provided on the upper bracket 26.
As a result, the front wheels 24 are steered so as to be rotatable left and right.

On the other hand, a swing arm 30 is pivotally mounted on a pivot shaft 29 provided at the lower center of the body frame 12 so as to swing around the pivot shaft 29, and a rear wheel 31 is rotated at a rear end of the swing arm 30. Freely supported.

By the way, stress concentrates on the joint between the head pipe 14 and the tank rail 15 and the down tube 19, so that as shown in FIG. Reinforcing plates 32 are erected from both sides with the tip side.

FIG. 3 is a perspective view of the fuel tank 21. The main body 21a of the fuel tank 21 is integrally formed by blow molding, rotational molding, or the like of a plastic resin such as polyethylene or polypropylene. Fuel tank 21
Is laid over the tank rail 15, so an inverted U-shaped ridge 33 is formed in the lower portion of the fuel tank main body 21a.

Fuel tank mounting plates 34 are provided on both side surfaces of the straddle 33 so as to project to the front of the fuel tank 21. The fuel tank mounting plate 34 is formed of, for example, a light metal material, and the fuel tank main body 2 is fixed by fixing means such as bolts 35.
It is integrally fixed to 1a. Alternatively, the fuel tank mounting plate 34 may be molded integrally with the fuel tank main body 21a using a plastic resin.

As shown in FIG. 2, a fuel tank mounting portion 36 is provided on the reinforcing plate 32, and a fuel tank mounting plate 34 is mounted on the fuel tank mounting portion 36 and is provided at the rear portion of the fuel tank 21. The fuel tank 21 is mounted on the vehicle body frame 12 by fixing the bracket 37 to the vehicle body frame 12 with bolts 38 or the like.

FIG. 4 is an enlarged side view of the fuel tank mounting portion 36, and FIG. 5 is a sectional view taken along the line VV of FIG.

As shown in FIGS. 3 and 4, the fuel tank mounting plate 34 is provided with a U-shaped notch 39 that opens toward the front of the fuel tank 21. The cutout portion 39 is formed horizontally or in such a manner that the open end thereof is lowered forward.

On the other hand, the fuel tank mounting portion 36 has the reinforcing plate 3
It is provided so as to project in the width direction on both side portions of 2. Note that FIG.
In the figure, only the fuel tank mounting portion 36 on one side of the reinforcing plate 32 is shown, and the other side is symmetrical to this and therefore omitted.

A mounting bar mounting hole 40 is opened in the reinforcing plate 32, and the rod-shaped mounting bar 4 is mounted in the mounting hole 40.
1 is penetrated so that both ends thereof protrude in the width direction. Further, screw holes 42 are formed at both ends of the mount bar 41. Cushion members 43 are fitted and inserted into both ends of the mount bar 41. The cushion material 43 is an elastic body such as rubber, and has an H-shaped cross-sectional shape having a groove 44 in the center. The cushion material 43 is fixed to the mount bar 41 by bolts 46 from both sides via washers 45. Then, the notch 39 of the fuel tank mounting plate 34 is fitted into the cushion member 43.

FIG. 6 is a sectional view showing another embodiment of the fuel tank mounting portion 36, in which both sides of the cushion member 43 are sandwiched by washers 45 and 47, and the inner washer 47 and the reinforcing plate 3 are arranged.
The fuel tank mounting portion 36 can be positioned in the width direction by interposing the spacer 48 between the fuel tank mounting portion 36 and the fuel tank mounting portion 36.

Next, the operation of this embodiment will be described.

When the fuel tank 21 is mounted on the vehicle body frame 12, the U-shaped notch 39 formed on the fuel tank mounting plate 34 is used as a cushion material for the fuel tank mounting portion 36 provided on the reinforcing plate 32 of the vehicle body frame 12. After being inserted into the groove 44 of the vehicle body 43, the rear portion of the fuel tank 21 is
Fixed to. To remove the fuel tank 21, the above procedure may be reversed.

The front portion of the fuel tank 21 can be fixed to the vehicle body frame 12 simply by inserting the fuel tank mounting plate 34 into the fuel tank mounting portion 36 and does not require bolts and nuts as in the conventional case. Therefore, the attachment / detachment of the fuel tank 21 becomes much easier than the conventional attachment structure. Also, there is no risk of losing bolts and nuts during maintenance work.

Further, since the structure of the fuel tank mounting portion 36 of the present invention is simpler than that of the conventional one, the number of parts can be reduced, and the weight and cost can be reduced.

[0033]

As described above, according to the resin fuel tank mounting structure for a motorcycle of the present invention, the tank rail extending rearward from the head pipe and the down tube extending obliquely downward from the head pipe. A motorcycle having a vehicle body frame including a reinforcing plate laid on the tank rail and the down tube, wherein a fuel tank integrally formed of a plastic resin is laid over the tank rail. A fuel tank mounting plate is integrally or integrally provided on the straddle portion of the fuel tank, and the mounting plate has a U-shaped notch opening toward the front of the fuel tank, while the reinforcing plate is provided with the fuel tank mounting portion. Since the notch of the mounting plate is fitted in this mounting portion, the fuel tank can be easily attached and detached with a simple structure.

[Brief description of drawings]

FIG. 1 is a left side view of a motorcycle showing an embodiment of a mounting structure for a resin fuel tank for a motorcycle according to the present invention.

FIG. 2 is a left side view of a body frame.

FIG. 3 is a perspective view of a fuel tank.

FIG. 4 is an enlarged side view of a fuel tank mounting portion.

5 is a cross-sectional view taken along the line VV of FIG.

FIG. 6 is a cross-sectional view showing another embodiment of the fuel tank mounting portion.

FIG. 7 is a side view showing a conventional mounting structure for a resin fuel tank.

8 is a sectional view taken along the line VIII-VIII in FIG.

[Explanation of symbols]

 11 Motorcycle 12 Body Frame 14 Head Pipe 15 Tank Rail 19 Down Tube 21 Fuel Tank 32 Body Frame Reinforcement Plate 33 Fuel Tank Straddle 34 Fuel Tank Mounting Plate 36 Fuel Tank Mounting Port 39 Fuel Tank Mounting Plate U-shaped Notch Part 43 Cushion material

Claims (1)

[Claims] 1. A vehicle body frame, comprising: a tank rail extending rearward from a head pipe; a down tube extending obliquely downward from the head pipe; and a reinforcing plate provided on the tank rail and the down tube. In a motorcycle in which a fuel tank integrally formed of a plastic resin is laid over the tank rail, a fuel tank mounting plate is integrally or integrally provided on the straddling portion of the fuel tank, and the mounting plate is mounted on the fuel tank. A resin for a motorcycle, comprising a U-shaped cutout opening toward the front, a fuel tank attachment portion provided on the reinforcing plate, and the cutout portion of the attachment plate fitted into the attachment portion. Fuel tank mounting structure.