JPH0478780A - Fuel tank installation device for motorcycle - Google Patents

Abstract

PURPOSE:To facilitate installation of a fuel tank on a motorcycle body frame by locking a fuel tank on the motorcycle body frame in the condition that it can be engaged and disengaged freely, and making the fuel tank rotate around the locking part freely in a horizontal direction. CONSTITUTION:When a fuel tank 32 is installed on the motorcycle body frame 2, the front fuel tank 32 is locked by a means 41 and a part of the weight of the front fuel tank 32 is supported by the motorcycle body frame 2. The front fuel tank 32 is rotated around the locking part to the side of a main frame 4 and is supported by the motorcycle body frame 2. After both the front fuel tanks 32 and 32 are completed to support by the motorcycle body frame 2, both the front fuel tanks 32 and 32 are connected to each other by a connecting means. It is thus possible to complete installation of the front fuel tanks 32 and 32 on the motorcycle body frame 2.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a fuel tank mounting device for a motorcycle.

(Prior Art) The above-mentioned mounting device has been conventionally used, for example, in Japanese Patent Application No. 62-212.
There is one shown in No. 991.

According to this, a pair of fuel tanks are provided that sandwich the main frame constituting the vehicle body frame from the left and right sides, and each fuel tank is placed on a bracket included in the vehicle body frame and screwed thereto. In addition, the upper ends of both fuel tanks are screwed to each other, and in this way both fuel tanks are attached to the vehicle body frame.

(Problem to be Solved by the Invention) In the above configuration, when the fuel tank is initially attached to the vehicle body frame, the fuel tank is first placed on the bracket. In order to prevent the fuel tank from easily slipping off, it is necessary to maintain the fuel tank in a predetermined position from the time it is placed on the bracket until it is screwed onto the bracket.

However, as mentioned above, it is difficult to maintain the fuel tank placed on the bracket in a predetermined position until it is screwed, or to screw each fuel tank to the bracket individually. I am making it a thing.

(Object of the Invention) The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to facilitate the attachment of a fuel tank to a vehicle body frame.

(Structure of the Invention) A feature of the present invention to achieve the above object is that each fuel tank is detachably locked to the vehicle body frame, and can be rotated left and right around the locking part. The fuel tank is provided with a pivot means and a connecting means that allows the rotating ends of both fuel tanks to be connected to each other when the fuel tank is rotated toward the main frame.

(for production) The effects of the above configuration are as follows.

Front fuel tank (fuel tank) 3 for body frame 2
2, first, the front fuel tank 32 is locked by the pivot means 41 so that part of the weight of the front fuel tank 32 is supported by the vehicle body frame 2. Next, center the front fuel tank 3 around the locking part.
2 is rotated toward the main frame 4 side and supported by the vehicle body frame 2.

When the support of the front fuel tanks 32, 32 on the vehicle body frame 2 is completed in this manner, the front fuel tanks 32, 32 are then connected to each other by the connecting means 60. In this way, the installation of the nii fuel tank 32, 32 to the vehicle body frame 2 is completed.

In the above case, at the beginning of the installation work, all that is required is to first lock the front fuel tank 32 to the pivot means 41. This will definitely prevent you from slipping down.

Moreover, each front fuel tank 32 can be attached to the vehicle body frame 2 without the complicated work of individually screwing them to the brackets of the vehicle body frame 2, as in the conventional case.

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

In FIGS. 1, 2, and 4, reference numeral 1 in the figures indicates an off-road motorcycle. 2 is a body frame, and this body frame 2 has a head pipe 3 at its front part,
A main frame 4 extends rearward from the head pipe 3 in plan view. Further, a pair of left and right rear arm brackets 5.5 extend downward from the rear end of the main frame 4.

6 is a pair of left and right down tubes, and these down tubes 6 are connected to the front end of the main frame 4 and the rear arm bracket 5.
It is connected to the bottom end of. The above left and right downchi et al. Pro, 6
The front upper part of is reinforced by a cross member 7. Further, stays 11 are removably installed on each down tube 6 and the main frame 4, and each of these members is reinforced.

The main frame 4 has an upper vibe 8. and a lower vibe 9 arranged vertically in parallel, and these vibes 8.9 are connected to a pair of left and right side plates 10. ．． They are connected to each other by 10. and,
As a result, the main frame 4 has a box-like cross section that is long vertically, and has a shape that can sufficiently withstand vertical loads during off-roading. Furthermore, since the main frame 4 is constructed of a single member, its width is made sufficiently large to withstand loads from the left and right directions.

A front wheel 12 is supported on the head pipe 3 so as to be freely steerable, and a front wheel 13 is supported on the front wheel 12.
, and a handle 14 are attached. On the other hand, a rear arm 16 is pivotally supported on the rear arm bracket 5 by a pivot shaft 15 so as to be vertically swingable.
A rear wheel 17 is supported at the swinging end of 6. Further, the rear arm 16 is supported by the main frame 4 via a shock absorber 18.

A four-stroke parallel two-cylinder engine 20 is supported at the lower part of the vehicle body frame 2, and a power transmission device 21 is connected to the engine 20. The rear wheel 17 is interlocked with this power transmission device 21 by a chain winding means 22,
Power from the engine 20 is transmitted to the rear wheels 17 via the power transmission device 21 and chain winding means 22.

Each cylinder 24 of the engine 20 is connected to the crank case 2.
5, and an intake pipe 26 is connected to each rear surface thereof. Each intake pipe 26 extends upward substantially vertically, and a carburetor 27 and an air cleaner 28 are connected to each upper end thereof. In this case, the intake pipe 26,
Since the carburetor 27 and the air cleaner 28 are arranged in the vertical direction, a downdraft effect is obtained in the engine 20. Reference numeral 29 denotes an exhaust pipe, and the exhaust pipe 29 once extends forward and downward from the front surface of each cylinder 24, and then is folded back and extends to the rear of the vehicle body.

A pair of left and right front fuel tanks 32 and a rear fuel tank 33 are provided for supplying fuel to the carburetor 27, and each front fuel tank 32 is supported by the vehicle body frame 2 above the engine 20.

On the other hand, the rear fuel tank 33 is supported by the rear end of the main frame 4 and a bracket 34 protruding from the rear arm bracket 5, and a seat 35 is attached to the rear fuel tank 33.

Also, a radiator 3 for water cooling the engine 20.
6 is provided, and this radiator 36 is attached to the front surface of the down tube 6. In addition, 37 is a cowling.

1 to 5, a support device for the left and right front fuel tanks 32 with respect to the vehicle body frame 2 will be explained.

A pivot means 41 is attached to the vehicle body frame 2 to lock and pivot the front and rear portions of the lower portions of each front fuel tank 32, respectively. This pivot means 41 has a front bracket 42 and a rear bracket 43, of which the front bracket 42 is screwed to the outer surface of the front part of the down tube 6 with a bolt 44.
A recessed groove 45 having a semicircular cross section and opening upward is formed in the recessed groove 45 , and the front end of this recessed groove 45 is closed by a stopper plate 46 . On the other hand, the rear bracket 43 is screwed onto the outer surface of the rear arm bracket 5 by bolts 48, and a groove 49 with a semicircular cross section that opens upward is formed in the rear bracket 43. The rear end of 49 is closed with a stopper plate 50. Further, both the grooves 45 and 49 are arranged on the same axis 51, and this axis 51 has an ascending shape. In addition, the double concave groove 45
．． 49 may have their respective axes slightly eccentric to each other.

A cylindrical rubber front cushioning material 52 and a rear cushioning material 53 are fixed to the front and rear ends of the lower part of each of the front fuel tanks 32, respectively. These are removably fitted into the two grooves 45 and 49, respectively, so that the front fuel tank 32 is locked to the vehicle body frame 2.

In the above case, the front cushioning material 52 and the rear cushioning material 53 are connected to the double concave groove 4.
5, 49, the front fuel tank 32 is removed from the vehicle body frame 2.

Further, in the locked state, it is located on the axis 51 together with the front cushioning material 52 and the rear cushioning material 53, and is rotatable about the axis 51 relative to the double grooves 45 and 49. As a result, the front fuel tank 32 is rotatable left and right about the axis 51 indicated by -F. Further, at this time, the respective protruding ends of the front cushioning material 52 and the rear cushioning material 53 are in contact with the corresponding stopper plates 46, 50, thereby determining the front and rear positions of the front fuel tank 32.

As shown in the right half of FIG. 1, the front fuel tank 32 is placed in a state where it can be rotated around the axis 51, and from this state,
When the upper part 55, which is the rotating end, is rotated toward the main frame 4 as shown by arrow A in the above figure, the upper part 55 is detachably engaged with the main frame 4 by the engaging means 56. It has become.

The engagement means 56 has an upper cushioning material 57 screwed to the side plate 1o, and the front fuel tank 32 has an engagement recess 58 into which the upper cushioning material 57 can be fitted and removed. . Then, as described above, the upper part 5 of the front fuel tank 32
5 is rotated toward the main frame 4, the upper cushioning material 57 and the engagement recess 58 fit together, as shown in the left half of FIG.

This prevents the front fuel tank 32 from moving upward relative to the main frame 4, and the front fuel tank 32 is supported by the main frame 4. In this case, the center of gravity 59 of the front fuel tank 32 is set closer to the main frame 4 than the axis 51, as shown in FIG. is also maintained in the supported state.

4 and 5, the engagement means 56 is shown as described above.
A connecting means 60 is provided that allows the upper portions 55 of the left and right front fuel tanks 32 to be connected to each other when the front fuel tanks 32 are supported by the front fuel tanks 32. This connecting means 60 is of a well-known buckle type, and when connected by this, both front fuel tanks 32, 32 are firmly attached to the vehicle body frame 2.

The front cushioning material 52, the rear cushioning material 53, and the upper cushioning material 57
have the same shape and size and are compatible. Also,
These absorb vibrations such as engine 20 vibrations that try to be transmitted from the vehicle body frame 2 side to the front fuel tank 32 side.

When both front fuel tanks 32 and 32 are attached to the vehicle body frame 2 as described above, the upper surfaces of the main frame 4 and each front fuel tank 32 are almost flat, especially as shown in FIGS. 2 and 5. In other words, this lowers the center of gravity.

Note that each of the above-mentioned cushioning materials may be replaced with a metal bottle. Further, the connecting means 60 may be formed of a bolt or a nut. Furthermore, the double grooves 45 and 49 may be formed in the front fuel tank 32 in a shape that opens downward, and the front cushioning material 52 and the rear cushioning material 53 may be provided in the vehicle body frame 2. Meanwhile, the upper cushioning material 57 is attached to the front fuel tank 32.
The engagement recess 58 may be formed in the main frame 4.

5 to 8, each of the front fuel tanks 32
A fuel inlet 62 is attached to the upper surface of each of the fuel pumps.

To explain this, a cylindrical injection vibro 3 is attached to the top plate of the front fuel tank 32, and a locking circumferential groove 64 is formed in the inner peripheral surface of the injection vibro 3. The upper end opening of the injection vibro 3 is closed by a cap 65 so as to be openable and closable. In this case, the lower part of the cap 65 is fitted into the injection vibro 3, and an O-ring 65a is interposed on the fitting surface. The cap 65 is provided with a locking protrusion 66 that can freely extend and retract in the radial direction, and the locking protrusion 66 is biased by a spring 67 in a direction to engage with the locking circumferential groove 64.

An operating shaft 68 is provided which vertically and slidably passes through the cap 65 on its axis, and this operating shaft 68 is biased downward 2 by a spring 69. The lower end of this operating shaft 68 is engaged with the locking protrusion 66 by a cam means 70, and when the operating shaft 68 is raised, the cam means 70 engages the locking protrusion 66.
6 is adapted to separate from the locking circumferential groove 64.

A downward stepped surface 71 is formed on the upper surface of the cap 65, and this stepped surface 71 occupies approximately half of the upper surface of the cap 65 and has a semicircular shape. A semicircular gripping ring 72 is fitted onto this step surface 71, and a base 73 of this gripping ring 72 is attached to the upper end of the operating shaft 68 on a pivot shaft 74.
It is pivoted so that it can move up and down.

As shown by the solid line in FIG. 9, when the grip ring 72 is rotated upward, the base 73 of the grip ring 72 presses against the stepped surface 71 against the spring 69, thereby raising the operating shaft 68. I am made to do so. Then, the locking protrusion 66 is disengaged from the locking circumferential groove 64 by the cam means 70 interlocked with this.

By the way, as mentioned above, the injection vibro 3 and the cap 6
5 and is fitted with an O-link 65a interposed therebetween, and this fitting may be done with a large force. Therefore, even if the grip ring 72 is gripped and simply lifted, the cap 65
may not be easily removed.

Therefore, in this case, the grip ring 72 is rotated around the axis of the cap 65 as shown by the solid line B in FIG. It is brought into contact with a vertical wall 75 extending to the step surface 71 as shown by the chain line. Then, continue to rotate the cap 65 to the point shown by the two-dot chain line in FIG.
rotate relative to Then, the fitting force between the two is weakened, making it easier to release the fitting.

Therefore, by grasping and lifting the grip ring 72 marked F, the injection vibro 3 can be easily opened and fuel can be injected.

Contrary to the above, when closing the injection vibro 3, the cap 65 is fitted onto the injection vibro 3 and pushed in, and the grip ring 72 is fitted into the stepped surface 71. In this way, the locking protrusion 66 is automatically locked in the locking circumferential groove 64 by the ribs 67, and the lidding of the injection vibro 3 is completed.

(Effects of the Invention) According to the present invention, the fuel tank is removably locked to the vehicle body frame, and the fuel tank is provided with a pivoting means that allows left and right rotation about the locking portion. When installing the tank, at the beginning of the work, by first locking the fuel tank to the pivot means, the fuel tank can be reliably prevented from accidentally slipping off the vehicle body frame. Therefore, at the beginning of installation, it is no longer necessary to hold the fuel tank in a predetermined position as in the past.

Moreover, the fuel tank can be attached to the vehicle body frame without the troublesome work of individually screwing it to the brackets of the vehicle body frame, as in the past.

Therefore, the fuel tank can be easily attached to the vehicle body frame.

Margin below C)

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a front view of front left and right fuel tanks, Fig. 2 is a left side view of the motorcycle, and Fig. 3 is a partially enlarged sectional view of Fig. 2. Figure 4 is a plan view of the left and right front fuel tanks, Figure 5 is an exploded perspective view of the vehicle body frame and front fuel tank, Figures 6 to 9 are views related to the injection port, and Figure 6 is a diagram of the 2nd fuel tank.
7 is a sectional view taken along the line ■-■ of FIG. 6, FIG. 8 is a plan view of the same as shown in FIG. 6, and FIG.
This figure corresponds to FIG. 6, and is an explanatory diagram of the operation. ■...Motorcycle, 2...Body frame, 4...Main frame, 32...Front fuel tank (fuel tank), 41...
- Pivoting means, 56... engaging means, 60... connecting means. Fig. 3 6,, 11 (~541″53-
・・・−11

Claims (1)

[Claims] 1. In a motorcycle equipped with a pair of fuel tanks that sandwich the main frame constituting the body frame from the left and right, each fuel tank is detachably locked to the body frame, and the fuel tanks can be rotated left and right around the locking part. Mounting a fuel tank on a motorcycle, comprising a pivoting means for making the fuel tank freely movable, and a connecting means for connecting the pivoting ends of both fuel tanks to each other when the fuel tank is pivoted toward the main frame. Device.