JPH0834379A - Twin frame type motorcycle fuel tank - Google Patents

Abstract

PURPOSE:To provide a twin frame type motorcycle fuel tank which solves conventional problems, can be mounted on all types of twin frame type motorcycles including those with small width such as trial motor cycles, is simple in production, and of which number of part items can be reduced more than the conventional fuel tanks. CONSTITUTION:A fuel tank 20 is mounted on a motorcyle provided with a pair of main frames 7 extending from a head pipe to the rear of a body. It is located at least partially between the pair of main frames 7, divided into upper and lower two parts, and also their mating surfaces 21a and 22a are located near the upper end of the main frame 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel tank mounted on a twin-frame type motorcycle having a pair of main frames.

[0002]

2. Description of the Related Art Conventionally, a fuel tank made of sheet metal mounted on a motorcycle has a lower part 91 as shown in FIGS. 9 (a) and 9 (b).
And a pair of lateral parts 92, 93 are often divided into three parts, and the flanges of adjacent parts are combined and pressed inward with an appropriate roller from the side (arrow in FIG. 9 (a)). (See a)) The mating surfaces are welded to form an integrated liquid-tight fuel tank. Note that each 90 indicates a main frame of the vehicle, and as is clear from the drawing, FIG. 9 (a) is a single main frame type motorcycle, and FIG.
Is a twin-frame type motorcycle.

[0003]

However, in the conventional fuel tank described above, in the case of the fuel tank to be mounted on the single main frame type motorcycle shown in FIG. 9 (a), the flanges 91 and 93 face outward. When the flanges 91 and 93 are laterally pressed by the roller as described above by combining adjacent parts together, there is no obstacle on the lateral sides of the flanges 91 and 93, so that it is possible to work without problems. However, in the case of the fuel tank mounted on the twin frame type motorcycle shown in FIG. 9 (b), as shown in the drawing, the side portion of the body of the component 91 is located on the side of the flange 91a of the lower component 91. However, since the width w is narrow, there is a manufacturing problem that the pressing work from the flange 91 side is difficult to perform. In the case of a motorcycle for trials with a narrow body width to improve running and handling during competition driving, etc., and in the case of a fuel tank mounted on a twin frame type main frame, the fuel tank itself Since the width must be narrowed, the width w between the flange 91a of the lower part 91 and the side part 91b of the lower part is further narrowed, and the pressing work during the welding becomes more difficult. INDUSTRIAL APPLICABILITY The present invention solves the above-mentioned conventional problems, and can be mounted on all kinds of twin-frame type motorcycles including motorcycles having a narrow vehicle width such as motorcycles for trial use. It is an object of the present invention to provide a fuel tank for a twin-frame type motorcycle that can reduce the number of parts compared to the conventional one.

[0004]

In order to achieve the above object, a twin-frame type fuel tank for a motorcycle according to the present invention is mounted on a motorcycle having a pair of main frames extending from a head pipe to the rear of the vehicle body. It is characterized in that it is at least partially fitted between the pair of main frames, divided vertically into two, and the mating surface is located near the upper end of the main frame. According to another feature of the invention,
A fuel tank mounted on a motorcycle having a pair of main frames extending from a head pipe to the rear of the vehicle body, the fuel tank being at least partially fitted between the pair of main frames, divided into upper and lower parts, and a combination thereof. A fuel tank for a twin-frame motorcycle, characterized in that a surface is arranged between the pair of main frames.

[0005]

According to the fuel tank for a twin-frame type motorcycle of the present invention constructed as described above, the upper part and the lower part, which are vertically divided into two parts, are assembled by liquid-tight welding, and the head is assembled. When mounted on a motorcycle having a pair of main frames extending from the pipe toward the rear of the vehicle body, the main body of the main frame is at least partially fitted between the pair of main frames, and the upper and lower parts of the main frames are joined to each other by the mating surfaces of the upper and lower parts. It will be located in the vicinity. Further, according to the fuel tank for a twin-frame type motorcycle according to another feature of the present invention, when the twin-frame type motorcycle fuel tank is assembled and then mounted on the motorcycle, the main body of the fuel tank is at least partially fitted between the pair of main frames, and the upper and lower parts are vertically arranged. The mating surfaces of the parts will be located between the main frames on both sides.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the fuel tank for a twin-frame motorcycle according to the present invention (hereinafter simply referred to as a fuel tank) will be described below. FIG. 1 shows a side view of a motorcycle 1 equipped with a fuel tank according to the present invention. This motorcycle 1 is a so-called trial motorcycle that is mainly configured to travel in uneven places such as mountains, and is designed for traveling on a normal road in consideration of handling of the vehicle body during traveling. It is designed to be narrower than a motorcycle. Reference numeral 2 in the drawing denotes a head pipe, and the head pipe 2 rotatably supports a steering shaft 3. The steering shaft 3 has a handle 4 mounted above it and a pair of left and right front forks 5 mounted below it. The pair of front forks 5 pivotally support a front wheel 6 therebetween. The front ends of a pair of left and right main frames 7 are fixed to the head pipe 2. The pair of main frames 7 extend toward the rear of the vehicle body, and each of the main frames 7 supports an upper end of a down tube 8 extending downward by a bracket (no reference numeral) attached to a front lower end thereof. An engine 9 is suspended in a space surrounded by the pair of main frames 7 and the down tube 8 described above, and a pair of left and right rear arms 10 is swingably supported at the rear end of the main frame 7. A rear wheel 11 is rotatably supported on the rear side of the pair of rear arms 10, and a removable side stand 12 is attached to an appropriate position of an intermediate portion thereof. As shown in FIG. 2 (a), the side stand 12 is provided on the upper end of a stand bar 15 on a support plate 14 that is inclined downward from the upper end fixed to the back plate 13a of the U-shaped bracket 13 toward the outside. The fork-shaped mounting bracket 16 is fitted in, and the stand bar 15 is pivotally attached to the pin 17 so as to be freely undulated. In the stand 12 configured as described above, after the U-shaped bracket 13 is fitted into the rear arm 10, the bolt is inserted from the upper plate 13b of the U-shaped bracket 13 through the rear arm 10 to the bottom plate 13c of the U-shaped bracket 13. 18 is penetrated and fixed to the rear arm. Therefore, the stand 12 can be easily attached to and detached from the rear arm 10 by attaching and detaching the bolts 18, so that, for example, when the motorcycle is used for both race running and general running. It becomes easy to attach and detach the stand 12 according to various usage conditions. 2B is a schematic side view showing a state in which the U-shaped bracket 13 is attached to the rear arm 10. Here, the support plate 14 provided on the U-shaped bracket 13 and the support plate 14 are shown in FIG. The attached stand bar 15 is omitted.

A fuel tank 20 is mounted between the pair of main frames 7, and a seat 19 is mounted behind the fuel tank 20 so as to slightly cover the front of the fuel tank 20. 3 (a) shows a schematic top view of the fuel tank 20, FIG. 3 (b) is a sectional view taken along line AA in FIG. 3 (a), and FIG. 3 (c) is in FIG. 3 (a). Each is a BB cross-sectional view. As shown in the drawings, the fuel tank 20 includes an upper part 21 and a lower part 22 which are welded and fixed to each other in a liquid-tight manner.
It is a split type. The upper part 21 and the lower part 22 described above are provided with flanges 21a and 22a, respectively, which project outward at the edge portions thereof.
Mounting bracket portions 23 and 24 for attaching to the main frame 7 are formed in front of and behind the a and 22a, respectively. Since the flanges 21a and 22a are on the same plane over the entire circumference, the workability of seam welding by rollers is improved. In addition, after the fuel tank 20 is assembled, the mounting bracket portions 23, are attached to the left and right side portions of the flanges 21a, 22a.
When the molding 25 is attached to the vehicle body so that the vehicle body vibration is prevented from being directly transmitted to the fuel tank 20 by avoiding metal contact with the main frame 7, the rider's feet are prevented when the rider gets on the vehicle. Fuel tank 20 on X
The flanges 21a and 22a are prevented from directly interfering with each other. Further, the molding 25 has projections 25a at both ends thereof, and when the moldings 25 are mounted on the flanges 21a and 22a, the projections 25a are fitted into holes 25a 'provided at corresponding positions of the flanges 21a and 22a. To prevent it from coming off (see FIGS. 4 (a) and 4 (b)). 5 is a partially enlarged view of the motorcycle 1 shown in FIG. 1 showing a mounted state of the fuel tank 20,
FIG. 6 is a sectional view taken along line CC of FIG. As shown in FIGS. 5 and 6, the fuel tank 20 is configured such that the lower part 22 of the fuel tank 20 is inserted between the pair of main frames 7 with a slight gap between the upper part 21 and the lower part. Flange 21a, which is the mating surface with 22,
22a is formed in such a shape that it is located near the upper end of the main frame 7. 7 (a) is a partially enlarged view of FIG. 5 showing details of the mounting portion of the fuel tank 20, and FIG. 7 (b) is shown in FIG.
Each of the schematic top views of (a) is shown. In the figure, reference numeral 26 denotes a cross member provided between a pair of left and right main frames 7, and a plate-shaped support member 27 is fixed to the cross member 26 with bolts (no reference numeral). Plate-shaped support member 2
7 has an upper end bent in an L shape toward the front of the vehicle so that the cooling water pipe 28 can be fixed, and a fuel tank support plate 29 extending toward the rear of the vehicle is fixed at a portion slightly downward from the upper end. There is. The fuel tank 20 is fixed to the main frame 7 by fixing a mounting bracket 23 formed in front of the flanges 21a and 22a thereof on the fuel tank support plate 29 with an appropriate fixing member such as a bolt and a nut. . Although not shown,
Similarly to the front mounting bracket 23, the rear mounting bracket 24 of the fuel tank 20 is also fixed to an appropriate cross member (not shown) provided between the main frames 7. The cooling water pipe 28 has a bracket 3 having a U-shaped cross section.
0 is fixed. This U-shaped bracket 30 is attached so as to open toward the cooling water pipe 28, and a plate-shaped cover 32 is attached to its upper piece so as to cover the entire upper portion of the cap 31 of the cooling water pipe 28,
The cap 31 of the cooling water pipe 28 is prevented from directly interfering with the rider's crotch during traveling, and the cap 31 of the cooling water pipe 28 can be removed only by removing the cover 32 to prevent mischief. There is.

The fuel tank 20 of the present invention constructed as described above is of the upper and lower half-divided type, and the flanges 21a and 22a are the mating surfaces of the upper part 21 and the lower part 22.
Are formed at the edges of the parts 21 and 22 so as to project outward, and therefore the flanges 21a and 22
It is easy to press a from above and below, and the number of parts is smaller than that of the conventional three-division type fuel tank, and the flanges 21a and 22a are located on the same plane over the entire circumference of the fuel tank. As a result, the assembly work such as welding is improved, and there is an effect that the manufacturing cost is simple and the manufacturing cost is low. Further, according to the fuel tank 20 of the present embodiment, the flanges 21a, 22a, which are the mating surfaces of the upper part 21 and the lower part 22 when mounted, are arranged near the upper end of the main frame 7, Since the lower part 22 can be designed to have a width such that it fits into the main frame 7 with a slight gap during mounting, the tank capacity can be sufficiently secured. . Although the mall 25 is provided in the above-described embodiment, the mall 25 is not essential, and it is possible to prevent interference with the rider's foot X without providing the mall 25 (see FIG. 6).

FIG. 8 shows a second embodiment of the fuel tank according to the present invention. According to this embodiment, the fuel tank 20 'is obtained by combining the upper and lower parts 21' and 22 '. Except for the position of the flanges 21a'22a 'and the width of the fuel tank 20' itself, it has the same configuration as the fuel tank 20 of the first embodiment. In this fuel tank 20 ', the lower part 22' is formed to be slightly shallower than the fuel tank 20 of the first embodiment, and when assembled and mounted on the main frame 7 ', the flanges 21a'22a' of the main frame 7'are formed. It is configured to hide inside. Therefore, the width of the fuel tank 20 itself is configured to be slightly narrower than that of the fuel tank 20 of the first embodiment, and the tank capacity is smaller than that of the fuel tank 20 of the first embodiment. By concealing the inside of the frame 7 ′, it is not necessary to attach a protective member such as the molding 25 ′ in the first embodiment, and the effect is that the appearance at the time of mounting is neat.

[0010]

According to the fuel tank for a twin-frame type motorcycle of the present invention described above, the main body is constructed so as to be vertically divided into two parts. Therefore, compared with the conventional three-part type fuel tank, The number of points is small, the number of welded parts is small, and the welding workability is also improved, which simplifies manufacturing.
This has the effect of reducing manufacturing costs. According to the twin-frame motorcycle fuel tank of the present invention,
When mounted on a vehicle, the main body is at least partially fitted between the pair of main frames, and the mating surfaces of the upper and lower parts are located near the upper ends of the main frames on both sides. The width of the tank itself is not limited to the joint portion of the mating surfaces, and it can be formed to have a width almost the same as the width between the pair of main frames of the vehicle to be mounted, so that the tank capacity can be sufficiently secured. Produce an effect. Further, according to the fuel tank for a twin-frame type motorcycle according to another feature of the present invention, when the twin-frame type motorcycle fuel tank is assembled and then mounted on the motorcycle, the main body of the fuel tank is at least partially fitted between the pair of main frames, and the upper and lower parts are vertically arranged. Since the mating surfaces of the parts are located between the main frames on both sides, there is no need to provide a special protective member on the mating surfaces, and the appearance when mounted is also neat. Play.

[Brief description of drawings]

FIG. 1 is a side view of a motorcycle equipped with a fuel tank according to the present invention.

FIG. 2A is a schematic assembly view of a side stand, and FIG. 2B is a schematic front view showing a state in which a U-shaped bracket is attached to a rear arm.

3A is a schematic top view of a fuel tank, and FIG.
3A is a cross-sectional view taken along the line AA in FIG. 3A, and FIG.
It is a -B sectional view.

FIG. 4A is a diagram showing a state before the molding is attached to the fuel tank, and FIG. 4B is a diagram showing a state where the molding is attached to the fuel tank.

5 is a partially enlarged view of the motorcycle shown in FIG. 1 showing a mounted state of a fuel tank.

FIG. 6 is a sectional view taken along line DD in FIG.

7A is a partially enlarged view of FIG. 5 showing details of a mounting portion of the fuel tank 20, and FIG. 7B is a schematic top view of FIG. 7A.

FIG. 8 is a view corresponding to FIG. 6 showing a second embodiment of the fuel tank according to the present invention.

9 (a) and 9 (b) are schematic cross-sectional views showing a conventional fuel tank, respectively.

[Explanation of symbols]

 1 Motorcycle 2 Head Pipe 3 Steering Shaft 4 Handle 5 Front Fork 6 Front Wheel 7 Main Frame 8 Down Tube 9 Engine 10 Rear Arm 11 Rear Wheel 12 Side Stand 13 C-shaped Bracket 13a Back Plate 13b Top Plate 13c Bottom Plate 14 Support Plate 15 Stand Bar 16 Bifurcated Mounting Bracket 17 Pin 18 Bolt 19 Seat 20 Fuel Tank 21 Upper Part 21a Flange 22 Lower Part 22a Flange 23 Front Mounting Part 24 Rear Mounting Part 25 Mold 26 Cross Member 27 Plate Support Member 28 Cooling Water Pipe 29 Fuel Tank Support Plate 30 U-shaped bracket 31 Cooling water pipe cap 32 Cover

Claims (2)

[Claims] 1. A fuel tank mounted on a motorcycle including a pair of main frames extending from a head pipe to the rear of the vehicle body, wherein the fuel tank is at least partially fitted between the pair of main frames and is vertically divided into two parts. The fuel tank for a twin-frame motorcycle is characterized in that the mating surface is located near the upper end of the main frame. 2. A fuel tank mounted on a motorcycle comprising a pair of main frames extending from the head pipe to the rear of the vehicle body, wherein the fuel tank is at least partially fitted between the pair of main frames and is vertically divided into two parts. A fuel tank for a twin-frame motorcycle, characterized in that the mating surface is located between the pair of main frames.