JPH071355Y2 - Motorcycle fuel tank mounting structure - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a motorcycle, which is detachably mounted across a vehicle body frame behind a head pipe of a motorcycle.
The present invention relates to a fuel tank mounting structure.

[Prior Art] In a motorcycle fuel tank, a rubber damper is generally attached to a vehicle body frame behind a head pipe, and a bracket provided at a front portion of the tank is inserted into the damper so that a front portion of the tank is Is attached to the body frame.

As an example of this type of conventional mounting structure, as shown in FIG. 5, pin members 52 are provided on both sides of a vehicle body frame (here, main pipe) 21, and a cylindrical damper 61 is provided around each pin member 52. As shown in FIG. 6, substantially U-shaped brackets 53 having open fronts are provided on the opposing wall surfaces in the recesses 2'at the bottom of the fuel tank 1 ', respectively. Insert the bracket 53 into the damper 61, and
For supporting the front part of the main pipe 21 (Shinkai 60-1
No. 25283) has been proposed.

[Problems to be Solved by the Invention] According to the conventional tank mounting structure, as described above, the tank side bracket 53 is inserted and fixed to the damper 61 fitted to the pin members 52 projecting from both sides of the vehicle body frame 21. Therefore, since a considerably large space is required between the body frame 21 and the wall surfaces of the recess 2'of the tank 1'on both sides thereof, the width of the recess 2'of the tank 1'is increased. It must be widened, and the external dimensions are large compared to the tank capacity. Further, since the fuel tank 1'is moved forward and backward with respect to the damper 61 on the vehicle body frame side to be positioned, it is difficult to position the tank 1 '. Further, since the bracket 53 on the tank side also has to be shaped so as to be inserted around the damper 61, the weight of the entire tank 1'including the bracket 53 becomes heavy.

The present invention has been made in view of the above-mentioned points, and the space required for mounting the tank is smaller than that of the conventional mounting structure, the outer dimension of the tank can be smaller than the capacity, and moreover, the body frame and the bracket are not necessary. The purpose of the present invention is to provide a fuel tank mounting structure in which the stress acting on the mounting portion on the tank side is dispersed via the, the load on the tank wall is small, and the tank can be easily positioned.

[Means for Solving the Problems] In order to achieve the above-mentioned object, according to the present invention, two metal thin plate members each having a mounting hole penetrating laterally are provided, and a washer is interposed around the mounting port. And the upper edges of at least one of the thin plate members are bent outward to form a bracket, and a bracket is formed at the front part of the bottom plate of the fuel tank with a gap. The upper open surfaces of the brackets are fixed to each other, and the mounting opening of the bracket is mounted on the vehicle body frame with a damper provided in the mounting opening.

In addition, it is preferable that the thin plate members of the two brackets are integrally joined by burring the opening edges of the two thin plate members, and spot welding the thin plate members on both sides of the washer to the washer. .

[Operation] According to the tank mounting structure of the present invention having the above-described configuration, since the mounting surface of the bracket to the bottom plate of the tank can be widened, the stress acting on the bottom plate of the tank from the body frame via the bracket is dispersed, The load on the tank bottom plate per area is reduced. In addition, since a washer is provided inside the mounting opening of the bracket so that the mounting opening has a width, the surface pressure acting on the damper inserted in the mounting opening from the mounting opening side is considerably low. .
Further, since the bracket supporting the tank is made of two thin metal plates, and each thin plate has an elastic function, the bracket itself also has a damper effect, and the bracket in the mounting opening together with the bracket also has a body frame. Absorbs the shock that is about to act on the tank. Furthermore, since the damper is mounted in the mounting opening of the bracket and mounted on the vehicle body frame, movement of the tank in the front-rear direction is restricted in the mounted state, so that the tank is positioned at the same time as the mounting.

Particularly, as described in claim 2, the attachment ports of the two thin metal plates are burred, and spot-welded to the washers from both sides of the thin plates to integrally join them to form a bracket. In this case, the joint portion on the inner circumference of the mounting opening becomes a smooth surface and does not remain after welding, so that the damper is not cracked for a long period of time.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a left side view showing the vicinity of a fuel tank of a motorcycle. In the figure, a fuel tank 1 is behind a head pipe (not shown) and is a main pipe as a body frame.
It is attached to a sub-frame 22 extending downward from the front part of the main pipe 21 via a bracket 3 provided on the front part of the tank 1 so as to extend downward. Further, behind the tank 1, a seat 41 is arranged with its front bottom face placed on the rear part of the tank 1. Although not shown, the rear portion of the tank 1 is also attached to the main pipe 21 by a known attachment means via a bracket or the like.

2 is an enlarged sectional view taken along the line AA of FIG. 1, FIG. 3 is a detailed sectional view corresponding to FIG. 2 showing a mounting state of the tank, and FIG. 4 is a sectional view taken along the line BB of FIG. Is. As shown in FIG. 2, the fuel tank 1 has a recess 2 formed by bending the bottom plate 1a upward in an inverted U shape at a central portion thereof. Then, on both sides of the lower part of the recess 2, tank mounting brackets 3 are extended downward through reinforcing plates 4 near the bent portions of the bottom plate 1a.

As shown in FIG. 4, the bracket 3 of the present invention has a tongue shape in a side view, and a mounting port 5 penetrating laterally is formed in the center of the lower part thereof. Further, as shown in FIG. 2 and FIG. 3, the sectional structure of the bracket 3 is 2
A washer 6 is arranged around the mounting opening 5 on the inner surface sides of the metal thin plate members 3a and 3b facing each other, and the opening peripheral edge 5a bent toward the inner surface side of the mounting opening 5 is abutted with the washer 6 sandwiched therebetween. . In this state, the thin plates 3a, 3b are integrally joined by spot welding or the like to the washer 6 from the outer surface side of the thin plates 3a, 3b on both sides. If the mounting opening 5 is burred so that a corner portion is not formed on the opening peripheral edge 5a, a damper 31 (an annular groove 33 thereof) to be fitted into the mounting opening 5 will be cracked. It is more desirable because it becomes difficult. In addition, each thin plate material 3a, 3b
The upper part of one of the thin plate members 3a is bent outward at a substantially right angle, and the other thin plate member 3b is bent partially to extend vertically corresponding to the shape of the bottom plate of the tank 1 to which they are fixed. Are open. And the bottom plate of the tank 1
A reinforcing plate 4 is fixed to 1a by spot welding or the like, and open surfaces of the thin plate members 3a and 3b are fixed to the reinforcing plate 4 by brazing or the like.

On the other hand, as shown in FIG. 3, on the vehicle body frame side to which the tank 1 is attached, a bracket 23 having a substantially U-shape is relatively mounted on the subframe 22 extending downward from both sides of the main pipe 21. The bracket 25 is fixed, and the insertion holes 24 are formed in the brackets 23 so that their positions are aligned with each other, and the nuts 25 are fixed around the insertion holes 24 on the rear surface side of the bracket 23.

Then, as shown in FIG. 3, an annular shape into which the mounting port 5 (FIG. 2) of the tank 1 side bracket 3 can be fitted around a cylindrical rubber damper 31 having a bolt through hole 32 in the center. A groove 33 is provided in advance, and the annular groove 33 is provided with a mounting port 5 (Fig. 2).
The parts are fitted and the dampers 31 are fitted into the mounting openings 5 (FIG. 2) of the brackets 3, respectively. Also, the through hole of the damper 31
A collar 34 is loaded into the inside 32, and a bolt 35 is inserted into the through hole 32 through a washer 36 at the head 35a thereof. Then, cover the main pipe 21 with the recess 2 of the tank 1, and adjust the mounting position of the tank 1 so that the protruding portion of the bolt 35 can be inserted into the insertion hole 24 of the bracket 23.
The tip projection of 35 is passed through the insertion hole 24 and screwed into the nut 25. In this way, the front portion of the tank 1 is attached to the main pipe 21 via the damper 31 by tightening the bolt 35 to the nut 25.

[Advantages of the Invention] According to the tank mounting structure of the present invention having the above-described configuration, the following effects are brought about.

(1) Since the distance between the brackets on both sides and the width of the recess at the bottom of the tank can be made small enough to straddle the body frame,
The space required for mounting the tank is smaller than that of the conventional mounting structure, and the outer size of the tank can be smaller than its capacity.

(2) Since the tank is positioned with the tank attached to the vehicle body frame, positioning work is easy, and since the bracket mounting surface with respect to the bottom plate of the tank can be widened, the tank can be mounted from the vehicle body frame via the bracket. The stress acting on the bottom plate is dispersed, and the load on the tank bottom plate per unit area is reduced.

(3) Since the mounting opening has a width by interposing a washer inside the mounting opening of the bracket, the surface pressure acting from the mounting opening side on the damper inserted in the mounting opening is low. Therefore, the durability of the damper is also improved.

(4) Since the bracket for supporting the tank is made of two thin metal plates, the bracket itself also has a damper effect, and the bracket together with the damper relieves the impact that acts on the tank from the vehicle body frame.

(5) According to the mounting structure of claim 2, since the mounting port is burring processed and the brackets are integrally joined by spot welding, the inner peripheral surface of the mounting port is smooth and does not remain after welding. In contrast, it does not cause cracks for a long time.

[Brief description of drawings]

1 to 4 show an embodiment of the tank mounting structure of the present invention, FIG. 1 is a left side view showing the vicinity of a fuel tank of a motorcycle, and FIG. 2 is an enlarged sectional view taken along line AA of FIG. 3 and 4 are detailed cross-sectional views corresponding to FIG. 2 showing the mounting state of the tank, and FIG. 4 is a view taken along the line BB of FIG. FIG. 5 is a cross-sectional view showing a conventional general tank mounting structure corresponding to FIG. 3, and FIG. 6 is a cross-sectional view taken along the line CC of FIG. 1 ... Fuel tank, 2 ... Recess, 3 ... Bracket (tank side), 3a, 3b ... Metal thin plate material, 4 ... Reinforcing plate, 5
…… Mounting port, 6 …… Washer, 21 …… Main pipe (body frame), 24 …… Bracket (frame side), 25 ……
… Nuts, 31 …… dampers, 33 …… annular grooves, 35 …… bolts, 41 …… seats.

Claims (2)

[Scope of utility model registration request] 1. A fuel tank mounting structure for a motorcycle, which is mounted behind a head pipe and straddles a vehicle body frame, wherein two metal thin plate members each having a mounting port penetrating laterally are provided around the mounting port. At the same time as abutting the opening peripheral edge of the mounting port through a washer to join together, at least one of the thin plate members is bent outward to open and form a bracket, at the front of the bottom plate of the fuel tank. A fuel for a motorcycle, characterized in that the upper open surfaces of a pair of the brackets are fixed to each other with a space provided, and a mounting opening portion of the bracket is mounted on a vehicle body frame with a damper provided in the mounting opening. Tank mounting structure. 2. A thin plate material is integrally joined by burring the two thin plate material mounting holes of the bracket, abutting the peripheral edges of the openings, and spot welding the washer on both sides of the thin plate material. Claim 1
The fuel tank mounting structure for the motorcycle described in.