JPS59106380A - Fuel tank of motorcycle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fuel tank for a motorcycle constructed from a combination of four-part parts.

In general, fuel tanks for motorcycles that are mounted across the body frame to increase capacity are a combination of a pair of upper and lower half-holes, a pair of left and right half-holes, or a pair of left and right half-holes on the top and a lower half. In this case, a combination of three parts of the bottom plate is used.

However, in this type of conventional fuel tank, when taking into consideration the ease with which each partial body can be pulled out by pressing, it is necessary to gently bend each half-hole for the joining part of each half-hole. It is not possible to obtain a tank shape in which the front part of the tank extends by utilizing the dead space behind and on both sides of the head pipe in a two-wheeled vehicle, and the shape is significantly restricted.

For this reason, there is a limit to how effectively the capacity of the tank can be increased, and there is also a limit to the versatility of the shape.

SUMMARY OF THE INVENTION An object of the present invention is to provide a fuel tank for a motorcycle, which has an increased tank capacity, an increased degree of freedom in shape, and a desired tank design.

In order to achieve such an objective, the present invention is applied to a fuel tank of a motorcycle mounted across the main hump, for example, and its main structure is to divide the fuel tank into four parts, that is, the top part is divided into four parts, the top part is the top left part, and the top right part is the top part. It is characterized in that a total of four parts, the left bottom part and the right bottom part, are hermetically welded together.

Below, preferred embodiments that further embody the present invention will be described in detail with reference to the drawings.

In the drawings, FIG. 1 is a side view of a motorcycle equipped with a fuel tank according to the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a front view thereof. First, in order to clarify the present invention, the general structure of a motorcycle will be explained with reference to FIGS. 1 to 3.

The motorcycle designated by reference numeral 1 in the figure has a body frame 3 whose front part is attached to a head tube 2. The head tube 2 has a front fork 5 supporting a front wheel 4, a top bridge 6 and a bottom bridge 7. Connected via.

On the other hand, an engine unit 10 is mounted on the lower part of the vehicle body frame 3, and a rear fork 12 that supports a rear wheel 11 is pivoted and extends rearward at the rear lower part of the frame 3, and there is a gap between the front part of the rear fork 12 and the vehicle body frame 3. The rear wheel shock absorber 13 is supported by a so-called progressive link mechanism.
is valve installation 7. .

Further, the upper part of the vehicle body frame 3, that is, the herad tube 2
A fuel tank 14 according to the present invention is mounted on the main frame 3d extending rearward from the top of the main frame 3d, and a seat 15 is attached to the rear thereof.

In the drawing, reference numeral 16 indicates a handle attached to the upper part of the front fork 5, 17 indicates a headlight, 18 indicates a front fender, 19 indicates a rear fender, and 20 indicates a muffler.

Next, such a fuel tank 14 will be explained with reference to FIGS. 4 to 7. 4 is a side view of the fuel tank, FIG. 5 is a bottom view thereof, FIG. 6 is a sectional view taken along line 6--6 in FIG. 4, and FIG. 7 is an exploded perspective view of the fuel tank.

As shown in FIG. 7, the fuel tank 14 consists of a combination of four parts: a left body part 21, a right body part 22, a left bottom part 23, and a right bottom part 24.

The left body part 21 is mainly a left side surface 21 of the fuel tank 14.
a, an upper surface 21b, and a rear surface 21c, and as is clear from FIG. 4, the side surface 21a is approximately trapezoidal, that is, the lower side 21d is approximately horizontal, the front side 21e is approximately vertical, and the rear side 21f is inclined so that the lower part is wide. At the same time, the upper side 21 (J is a rear side that bulges upward to form the upper surface 21b.!, the back surface 2
1C extends downward from the upper surface 21b along the rear side 21f. As is clear from FIG. 5, the front side of the side surface 21a is formed to bulge outward and contract toward the rear. Note that a flange 21h for seam welding to the left bottom portion 23 side is formed on the other edges except for the edges of the upper surface 21b and the rear surface 21G.

Further, the right body part 22 is formed line-symmetrically with the above-mentioned left body part 21 with the joint part a (FIG. 7) as a line of symmetry,
Its size, shape, etc. are substantially the same as the left body part 21, and the right body part 22 mainly constitutes a right side surface 22a1, an upper surface 22b, and a rear surface 22C, and 22d indicates a flange. In addition, when the left body part 21 and the right body part 22 are joined as shown in FIG. 7, a bulge part 25 having a circular front part is formed on the upper surfaces 21b and 22b, and a bulge part 25 is formed at the middle position of the upper surface of this bulge part 25. A fuel filler port 26 is formed. The planar shape is still the second
As is clear from the figure, the front part is wide and gradually narrows toward the rear, and the rear end width is approximately the same as the width of the seat 15.

On the other hand, the left bottom portion 23 is composed of a left bottom surface 23a, a front surface 23b, and an inner surface 23C.The bottom surface 23a is a substantially horizontal surface, and a front surface 23b is formed substantially perpendicularly thereto, so that the left side surface 21a of the left body portion 21 and the head The dead space behind and on both sides of the pipe, that is, on the front side of the tank, is utilized to ensure a large tank capacity. This front 23b
The upper part of the front fork 5 forms an inclined surface 23b-1 rearward at the same angle as the inclination angle of the front fork 5, and the front edge 23
d is the same vertical as the front side 21e of the left body portion 21. The inner surface '-30 has an upper side that is connected to the main frame 3.
By making the rear lower part the same angle as the inclination angle of part a, and by forming a curved surface inwardly, when joined to the right bottom part 24, there is a substantially inverted U-shaped recessed part 26 with a downward opening in both parts. (Figure 6).

In addition, a necessary recess of 23 cm is provided at the lower part of the inner surface 23C so that auxiliary equipment etc. can be placed below the fuel tank 14.
1.23 cm2, and an outlet 27 for discharging fuel is formed in the bottom surface 23a. Further, a flange 23d for seam welding is formed by bending the periphery.

In addition, the right bottom portion 24 is different from the left bottom portion 23 mentioned above at the joint b (
7), and the size, shape, etc. thereof are substantially the same except for the absence of the outlet 27, and this right bottom portion 24 is formed on the right bottom surface 24a1.
Furthermore, 24
d is a flange.

Therefore, the left body part 21, which is each partial body explained above,
The fuel tank 14 is obtained by reversely joining the right body part 22, left bottom part 23, and right bottom part 24 by seam welding the respective flanges.
As is clear from the drawings and FIGS. 1 to 3, the front upper part 14a of the fuel tank 14 extends forward of both measuring parts so as to straddle the front fork 5. As a result, at least the fuel It is possible to effectively increase the capacity of the front upper part 14a of the tank 14, and as a result, the arrangement of other equipment, numerals 28 and 29, can be welded to the inner surfaces of the left and right bottom parts 23 and 24. 30 indicates a mounting member provided at the rear end of the fuel tank 14.

When mounting the fuel tank 14 on the vehicle body frame 3, the main frame 3a is placed along the bottom of the recess 26 as shown in FIG. The mounting member 2B is placed along the
, 29, 30, etc., to fix it.

Therefore, in the assembled fuel tank 14, the left and right body parts 21 and 22 constitute the overall shape of the fuel tank 14, and the left and right bottom parts 23 and 24 also constitute the front and bottom shapes, thereby improving the external appearance design. It is an important element that makes up the

It should be noted that arbitrary changes in the embodiments without departing from the gist of the detailed shapes, etc. are permitted within the scope of the present invention, and can be similarly applied to motor tricycles and the like.

As is clear from the above description, the fuel tank for a motorcycle according to the present invention has a fuel tank divided into four parts, that is, the top part is composed of a left top part and a right top part, and the bottom part is made up of a left bottom part. and the right bottom part, and since these are sealed and welded together, the press molding of each part can be performed in all four directions of the tank, increasing the degree of freedom in the shape of the tank.
In particular, the tank capacity is increased by allowing the front part of the tank to be extended into the dead space behind and on both sides of the head nob of a motorcycle, and the degree of freedom in shape is increased, making it possible to obtain the desired tank design. It can be provided as a fuel tank for a motorcycle with various advantages.

[Brief explanation of the drawing]

FIG. 1 is a side view of a motorcycle equipped with a fuel tank according to the present invention, FIG. 2 is a plan view of the same, FIG. 3 is a front view of the same, and FIG.
5 is a bottom view of the fuel tank according to the present invention, FIG. 6 is a sectional view taken along line 6-6 in FIG. 4, and FIG. 7 is an exploded perspective view of the fuel tank according to the present invention. be. In the drawing, 3 is the vehicle body frame, 3a is the main frame,
14 is a fuel tank, 21 is a left body part, 22 is a right body part, 23 is a left bottom part, and 24 is a right bottom part. Patent applicant Honda Motor Co., Ltd.

Claims (1)

[Claims] In a fuel tank for a motorcycle mounted across a vehicle body frame, the top surface of the fuel tank is composed of an upper left surface section and an upper right surface section, and the bottom surface section is composed of a left bottom surface section and a right bottom surface section. A fuel tank for a motorcycle, characterized in that it is constructed by integrally sealing and welding divided parts.