JPS6149153B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a support structure for a fuel tank in a motorcycle, and more particularly to a support structure for a fuel tank having a seat for a passenger on the upper surface.

Conventionally, in small-displacement motorcycles, the upper end of the frame that rises from the middle of the vehicle body is inserted into the fuel tank, and the two are welded at the top and bottom to integrally attach and support the fuel tank to the frame. There is something I did.

However, this structure has the disadvantage that the capacity of the tank is reduced by the volume occupied by the frame.Also, since the tank and frame are welded together, if the tank is damaged, it cannot be removed separately. The problem is that it cannot be removed and must be removed together with the frame, making it difficult to maintain.

Furthermore, since the frame is inserted into the tank, the sealing performance of the tank may become a problem.

In addition, it was developed in 1973 as a support structure for this type of fuel tank.
- There is one disclosed in Publication No. 104559. However, in this case, the upper brackets 3 and 4 fixed to the lower surface of the fuel tank 2 are connected to the lower brackets 6 and 7 fixed to the outer upper surface of the vehicle body frame 5 with bolts and nuts 9 and 11. At the very least, the fuel tank 2 should be installed, especially at the joint between the front brackets 3 and 6, where the weight of the fuel tank 2 and the weight of the occupants are concentrated, at an angle to the axial direction of the vehicle body frame 5. Since the brackets 3 and 6 have a cross-mounted and supported structure, the brackets 3 and 6 must be made thicker than necessary to be strong, and at the same time, as is clear from the characteristics of the body frame 5. Although the strength against external forces applied from the axial direction is rigid, the strength against external forces applied from the transverse direction intersecting the axial direction is soft. The frame 5 itself also needs to be made strong by having a pipe thicker than necessary and having a large diameter as a whole.

In other words, this type of motorcycle is a vehicle with strong engine vibrations and vibrations while running, and the weight of the rider is directly applied to the mounting support of the tank 2 via the fuel tank 2. A support structure like this has a poor directionality on which the weight of the fuel tank 2 and the weight of the occupant are applied, and as a result, it is not suitable for a structure that stably supports the fuel tank 2 having the seat 1 on the top surface over a long period of time. There are some difficulties.

The present invention has been made in view of the above-mentioned conventional circumstances, and its purpose is to provide a fuel tank mounting support structure that sufficiently limits the stiffness direction of the frame against external forces. At the same time, the purpose is to allow the fuel tank to be easily attached and detached.

The technical means taken by the present invention to achieve such an object is to fit and weld a supporting member to the outer periphery of the upper end of the upright rod of the frame rising from the middle part of the vehicle body, and to attach the support member to the upper end of the upright rod. The bottom surface of a fuel tank having a passenger seat on the upper surface is removably placed on the supporting member through an appropriate fastening means, and the tank is attached to the supporting member, and the supporting member is attached to the ship. It is characterized in that it is formed into a shape, and a flat portion is formed on the upper edge of the opening to extend outward over almost the entire circumference.

An example of the embodiment of the present invention will be described with reference to the drawings. In FIG. 1, A is a vehicle body, a is a frame thereof, 1 is a support member, and 2 is a fuel tank.

The frame a is formed by bending a single pipe, and its structure is shown enlarged in FIGS. 2 and 3.

Frame a has a horizontal rod part _a1 formed in the middle part.
, an inclined rod portion a ₂ that smoothly curves and rises upward from the front end of the rod portion a ₁ , and an upright rod portion that curves upward from the rear end of the horizontal rod portion a ₁ and rises above the middle portion of the vehicle body A. It consists of part _a3 .

A head pipe 4 is welded to the tip of the inclined rod part _a2 , and a steering shaft 5 is attached to the pipe 4.
Make sure to insert the .

The support member 1 and its reinforcing plate 6 are welded to the upper end of the upright rod portion _a3 .

The support member 1 is formed into a substantially ship shape, and the upright rod portion _A3 is inserted into the approximate center of the bottom surface of the support member 1 so as to slightly protrude from the upper surface of the support member 1, and the bottom surface portion is used as the upright rod portion.
It is fitted and welded to the outer periphery of the upper end of A ₃ and attached approximately horizontally to the upper end of the upright rod A ₃ .

The supporting member 1 has the upper edge of its opening protruding outward in an inclined or horizontal manner over almost the entire circumference to form a flat part, and the four corners of this flat part protrude circularly, and an opening is opened at the center of the protruding part 7. A hole 7' is provided,
A bolt 8 of the fuel tank 2, which will be described later, is inserted into the hole 7'.

Further, the support member 1 has a support shaft 10 inserted in its rear portion and protrudes from one side, and a rear suspension 18 is attached and supported on the protrusion.

Note that the support shaft 10 is welded to the reinforcing plate 6.

The reinforcing plate 6 is formed so as to cover the upper surface of the supporting member 1, and its outer periphery is overlapped with the supporting member 1, and the central part is recessed and opened, and the upright rod portion a ₃ is inserted into the opening 6'. It is inserted and welded to the outer periphery of the rod part _A3 . As a result, the support member 1 is also reinforced by the reinforcing plate 6, and the strength of attachment to the upright rod portion _a3 is increased.

Further, the reinforcing plate 6 has a protrusion 9 formed at the four corners of its outer periphery to engage with the upper surface of the protrusion 7 of the support member 1, and an opening 9' is provided at the center of the protrusion 9, through which the bolt 8 of the fuel tank 2 is inserted. It's becoming like that.

The fuel tank 2 has a lid plate 2 on the top surface of the tank body 2a.
An oil tank 12 is formed at the rear of the tank body 2a through a partition frame 11 that is welded and suspended from the lid plate 2b. is support member 1
A recess 13 corresponding to the protrusions 7 and 9 of the reinforcing plate 6 is provided, and the head of a bolt 8 constituting an appropriate fastening means is welded and accommodated in the recess 13 via a fixing plate 14. 8 is made to protrude downward from the fixing plate 14.

Therefore, in this embodiment, the upright rod part _a3 of the frame a
After fitting and attaching the bottom surface of the support member 1 and the opening 6' of the reinforcing plate 6 to the outer periphery of the upper end, the supporting member 1 and the reinforcing plate 6 are welded to the outer periphery of the upright rod part _{a3 .} Attach the support member 1 to the upper end of the . Then, the threaded rods of each bolt 8 disposed in a protruding manner on the bottom surface of the fuel tank 2 are penetrated downward into the respective openings 7' and 9' provided in the protrusions 7 and 9 of the support member 1 and the reinforcing plate 6. After the fuel tank 2 is placed on the upper surface of the support member 1, nuts 15 are screwed into the threaded portions of the bolts 8 protruding from the respective openings 7' of the support member 1 to secure the fuel tank 2. It is designed to be detachably attached and supported on the support member 1.

Reference numeral 16 in the figure is an oil level gauge for detecting a decrease in the amount of oil immersed in the oil tank 12, and a passenger seat 17 is mounted and placed on the upper surface of the fuel tank 2 so that it can be viewed freely.

Since the support structure of the fuel tank of the present invention is configured as described above, it has the following effects.

A support member is fitted and welded to the outer circumference of the upper end of the upright rod of the frame that rises from the middle of the vehicle body, and the member is attached to the upper end of the upright rod, and the passenger seat is attached to the bottom of the fuel tank on the support member. Since the fuel tank is attached to the supporting member by being removably mounted on the fuel tank via an appropriate stopper, the fuel tank can be mounted while being placed on the supporting member, and the weight of the fuel tank and the occupant's weight can be reduced. This is a solid support structure that supports the body weight in the axial direction (forward direction) of the frame. Therefore, the fuel tank having the passenger seat on its upper surface can be firmly and stably supported for a long period of time even in a removable state. At the same time, the workability of attaching and detaching the fuel tank during repair, inspection, replacement, etc. is improved, resulting in excellent efficiency, and the capacity of the fuel tank can be increased.

The support member is welded and fixed to the upper end of the upright rod portion of the frame, and is formed into a substantially boat shape, and a flat portion is formed on the upper edge of the opening to extend outward over almost the entire circumference. With a highly durable and rigid structure capable of supporting and retaining the weight of the fuel tank and the weight of the occupant over a long period of time, the tank can be fixedly supported with the bottom surface of the fuel tank placed stably. In addition, the support member has a rigid structure and has the function of stably mounting and supporting the bottom of the fuel tank, making it possible to reduce the external size of the support member and simplifying the external structure of the lower part of the seat. I can do it.

Thus, the intended purpose can be achieved.

[Brief explanation of the drawing]

Fig. 1 is a side view showing the support structure of the present invention, Fig. 2 is a side view of the frame to which the support member is welded, and Fig. 3 is a side view showing the support structure of the present invention.
The figure is a plan view thereof, FIG. 4 is an enlarged sectional view of the main part, and FIG. 5 is a plan view thereof. In the figure, A is a vehicle body, a is a frame, 1 is a support member, and 2 is a fuel tank.

Claims (1)

[Claims] 1. A support member is fitted and welded to the outer circumference of the upper end of the upright rod of the frame that rises from the middle of the vehicle body, and the member is attached to the upper end of the upright rod, and a passenger seat is provided on the upper surface of the support member. The bottom surface of the fuel tank is removably placed on the bottom surface of the fuel tank via an appropriate fastening means, and the tank is attached to a support member, and the support member is formed into a substantially ship shape and extends almost all around the upper edge of its opening. A support structure for a fuel tank in a motorcycle, which is constructed by forming a planar portion that projects outward.