JPH0429592B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a motorcycle, and particularly to a structure for mounting a fuel tank to the body of a motorcycle.

BACKGROUND OF THE INVENTION A fuel tank for a motorcycle is normally installed on and across a main pipe that extends from the top of a head pipe toward a rear seat section.
However, especially when carrying a large amount of fuel, it is necessary to provide an auxiliary fuel tank in addition to the above-mentioned normal fuel tank.

Additionally, it is generally desirable to locate the fuel tank of a motorcycle as close to the center of the vehicle body as possible to lower the center of gravity of the completed vehicle.

Problems to be Solved by the Invention Therefore, an object of the present invention is to provide a motorcycle in which a large-capacity main or auxiliary fuel tank can be mounted in the center of the vehicle body, and in which the fuel tank can be easily attached and detached.

Means and Effects for Solving the Problems Therefore, in the present invention, the fuel tank is installed in an inverted triangular portion formed near the center of the vehicle body by the front frame member and the rear frame member. In addition, the rear frame member is detachably attached to the front frame member, and the fuel tank is supported at the front by the front frame member separately from the rear frame member, and is supported at the rear by the rear frame member in the longitudinal direction. They are removably engaged and supported. Therefore, first, the fuel tank is attached to the front frame member, and then the rear frame member is inserted from behind and attached to the front frame member, and the rear part of the fuel tank is engaged with the rear frame member to attach the rear frame member to the rear frame member. Since the fuel tank can be supported by members, the fuel tank can be shaped to overlap with at least one of the frame members forming the inverted triangle when viewed from the side.

In the present invention, the side shape of the fuel tank mounted on the inverted triangular part of the vehicle body is larger than the outline of the inverted triangle, so it is compared to a fuel tank installed by being inserted into the inverted triangular part from the side. It has a large capacity and can store more fuel.

Furthermore, since the work for attaching and removing the fuel tank and the work for attaching and removing the rear frame can be separated, these operations are facilitated.

Embodiment Hereinafter, the present invention will be explained with reference to an illustrated embodiment.

FIG. 1 is a side view showing the entire motorcycle to which the present invention is applied. The motorcycle of this embodiment is a motorcycle for traveling on rough terrain, with an engine E disposed between the front and rear wheels FW and RW, and a substantially U-shaped cross section large enough to cover the head of the engine E from the side. A main fuel tank MT is arranged across the main pipe 5. Furthermore, an inverted triangular part is formed approximately at the center of the vehicle body by a center pipe 8, an upper pipe 9, and a lower pipe 10, and the fuel tank 1 is mounted in this part. The fuel tank 1 is an auxiliary tank that supplements the main fuel tank MT, and the present invention relates to this fuel tank 1, and the term "fuel tank" hereinafter refers to this tank. As you can see from the figure, the fuel tank 1 is also a large capacity tank, and this motorcycle is equipped with this fuel tank 1 in addition to the large capacity main fuel tank MT mentioned above, so it can be used for a very long time. It is possible to continue driving without refueling.

FIG. 2 is a side view showing the body frame of this motorcycle, which consists of a main frame 2 at the front and a subframe member 3 at the rear. The main frame 2 includes a head pipe 4, a main pipe 5 connected to the head pipe 4 and extending rearward from the upper part along the center line of the vehicle body, and a down tube 6 that descends diagonally rearward from the head pipe 4 along the center line of the vehicle body.
A pair of left and right underpipes 7 branch from the lower end of the downtube 6 and extend rearward.
A center pipe 8 is connected to the rear end of each underpipe 7, and the pair of left and right center pipes 8 extend upward, and their upper portions are connected to both sides of the rear end of the main pipe 5. There is.

A front fork 11 (FIG. 1) is pivotally attached to the head pipe 4, and the front wheel FW is supported via this front fork 11. A rear fork 12 (FIG. 1) is swingably attached to the lower part of the center pipe 8, and a rear wheel RW is supported by this rear fork 12. A rear suspension (not shown) is disposed between the rear fork 12 and the rear end of the main pipe 5.

The subframe 3 includes an atsupa pipe 9 and a lower pipe 1 that branch into two stages from the rear to the front.
0, and one pair of upper pipes 9 and one pair of lower pipes 10 are provided on each side. This subframe 3 connects the front end of the top pipe 9 to a bracket 13 provided at the top of the center pipe 8.
, connect the front end of the lower pipe 10 to the center pipe 8.
It is removably attached to the main frame 2 by tightening bolts 15 and 16, respectively, to a bracket 14 provided at the bottom of the main frame 2,
An inverted triangular portion 17 is formed by a front frame member, that is, a center pipe 8, and a rear frame member, that is, an upper pipe 9 and a lower pipe 10. As described above, the fuel tank 1 is mounted on this inverted triangular portion 17.

FIG. 3 is a perspective view of the fuel tank 1. This fuel tank 1 is provided with a recess 18 as appropriate to avoid other members existing within the inverted triangular portion 17,
The shape is such that the space within the inverted triangular portion 17 can be utilized to the maximum extent. Note that the front wall of the rear recess 18 is as shown by the broken line in FIG.
Its vertical cross section is arcuate, and it also serves as a rear fender. However, the side shape of this fuel tank 1 does not fit within the outline of the inverted triangular portion 17, and overlaps with at least one of the frame members 8, 9, 10 forming the inverted triangular portion 17 when viewed from the side. It's on. That is, in this embodiment, bulges 19 are provided on both sides of the fuel tank 1, projecting laterally and downwardly, and when the fuel tank 1 is installed in the inverted triangular portion 17, as shown in FIG. As shown, the lower portion 19a of the bulging portion 19 protrudes from the outline of the inverted triangular portion 17 and overlaps with the lower pipe 10 when viewed from the side. Further, the upper portion 1a of the fuel tank 1 overlaps the top pipe 9. The bulge 19 also extends to each frame member 8,
It also protrudes outward from the surface including 9 and 10,
A refueling port 20 is provided in this bulging portion 19 .

Upper mounting portions 21 are provided on both left and right sides of the front upper portion of the fuel tank 1, and short column-shaped protruding shafts 22 are laterally implanted in these upper mounting portions 21. Lower mounting portions 23 are provided on both left and right sides of the lower front portion of the fuel tank 1, and the lower mounting portions 23 extend laterally as shown in the figure, and have bolt holes 24 drilled in the front and back direction.
On the other hand, the bracket 1 is attached to the upper part of the center pipe 8.
A receiving member 25, which opens upward, is fixedly provided below 3, and receives and supports the protruding shaft 22, as shown in FIGS. 4 and 5. A mount rubber 26 (FIG. 3) is fitted into the protruding shaft 22, and the protruding shaft 22 is supported by the receiving member 25 via the mount rubber 26. A mounting seat 27 with the mounting surface facing backward is fixed to the lower part of the center pipe 8. The lower mounting portion 23 of the fuel tank 1 is opposed to the mounting seat 27, and the mount rubber 2
The lower front portion of the fuel tank 1 is fixed to the center pipe 8 by fixing the lower mounting portion 23 to the mounting seat 27 with bolts 30 via the bolt 30 and the collar 29 .

In this way, the fuel tank 1 is attached to the upper mounting part 2.
1 and the lower attachment part 23, it is attached to and supported by the center pipe 8 via a mount rubber,
Further, on both sides of the rear part of the fuel tank 1, semi-circular rear mounting pieces 31 which are open toward the rear are protruded, and are mounted on a connecting plate 32 installed between the top pipe 9 and the lower pipe 10 of the subframe 3. The rear part of the fuel tank 1 is supported by the subframe 3 by engaging the protruding shaft 33 protruding from the rear mounting piece 31 (fourth and sixth
figure). A mount rubber 34 is inserted between the rear mounting piece 31 and the protruding shaft 33.

The fuel tank 1 and subframe 3 are attached to the main frame 2 in the following assembly order. First, the fuel tank 1 is approached from the rear to the center pipe 8 of the main frame 2, and the shaft 22 of the fuel tank 1 is engaged with the receiving member 25 of the center pipe 8 from above. Next, the fuel tank 1 is swung downward around the protruding shaft 22, the lower mounting portion 23 is opposed to the mounting seat 27, and the bolt 30 is tightened. The fuel tank 1 is thus fixed to the center pipe 8 and supported in a cantilevered manner. The subframe 3 is advanced from the rear of the fuel tank 1 while the upper pipe 9 and lower pipe 10 are aligned along the sides of the fuel tank 1, and the protruding shaft 33 is engaged with the rear mounting piece 31, and the upper pipe 9 and the lower pipe 10 are moved forward. The front end portions of the lower pipe 10 are aligned with the brackets 13 and 14, respectively, and are fixed with bolts 15 and 16.

In this way, the fuel tank 1 in which the bulging portion 19 and the upper portion 1a protrude from the outline of the inverted triangular portion 17 as described above is removed from the inverted triangular portion 17.
It can be very easily stored and mounted inside the vehicle. Further, the capacity of the fuel tank 1 can be increased by the amount protruding from the inverted triangular portion 17. Furthermore, when removing the subframe 3 from the main frame 2, there is no need to remove the fuel tank 1 at the same time, and the pipes attached to the fuel tank 1 can also be left as they are, so the removal work of the subframe 3 is easy. It becomes extremely easy and quick.

Although the present embodiment has been described above with reference to a preferred embodiment, the present invention is not limited to the above embodiment, and many modifications can be made within the scope of the present invention. For example, the shape of the fuel tank 1 may be changed. , it can be made into various shapes depending on the special characteristics of the motorcycle on which it is mounted.

Effects of the Invention As described above, in the present invention, a vehicle body portion consisting of a pair of left and right front frame members and a pair of left and right rear frame members each forming an inverted triangle with these front frame members is A frame member is removably attached to the front frame member, and a fuel tank is disposed on the vehicle body portion so as to overlap with at least one of the frame members forming the inverted triangle when viewed from the side. , the front part of the fuel tank is supported by the front frame member separately from the rear frame member, and the rear part of the fuel tank is supported by being removably engaged with the rear frame member in the longitudinal direction. Therefore, a large-capacity fuel tank can be mounted on the inverted triangular portion of the vehicle body, and furthermore, it is extremely easy to attach and detach the fuel tank and rear frame.

[Brief explanation of drawings]

Fig. 1 is a side view of a motorcycle to which the present invention is applied, Fig. 2 is a side view of the body frame of the motorcycle, Fig. 3 is a perspective view of the fuel tank, and Fig. 4 is a side view of the motorcycle to which the present invention is applied. FIG. 5 is a side view showing the attachment portion of the fuel tank to the front frame member, and FIG. 6 is a side view showing the attachment portion of the fuel tank to the rear frame member. 1...Fuel tank, 2...Main frame, 3
...Subframe, 4...Head pipe, 5...
Main pipe, 6...Down tube, 7...Under pipe, 8...Center pipe (front frame member), 9...Atsupa pipe (rear frame member), 10...Lower pipe (rear frame member),
11...Front fork, 12...Rear fork, 13,14...Bracket, 15,16...
Bolt, 17...inverted triangular part, 18...recess,
19...Bulging part, 20...Oil filler port, 21...Upper mounting part, 22...Protruding shaft, 23...Lower mounting part, 2
4...Bolt hole, 25...Receiving member, 26...Mount rubber, 27...Mounting seat, 28...Mount rubber, 29...Collar, 30...Bolt, 3
1... Rear mounting piece, 32... Connection plate, 33...
Protruding shaft, 34...Mount rubber.

Claims (1)

[Claims] 1. A vehicle body portion consisting of a pair of left and right front frame members and a pair of left and right rear frame members each forming an inverted triangle with these front frame members, the rear frame members being freely attachable to and detachable from the front frame member. A fuel tank is disposed on the vehicle body portion so as to overlap with at least one frame member forming the inverted triangle when viewed from the side, and a front portion of the fuel tank is attached to the front portion. A motorcycle characterized in that the fuel tank is supported by a frame member separately from the rear frame member, and the rear part of the fuel tank is supported by being engaged with the rear frame member so as to be freely engageable and disengageable with the rear frame member.