JP2526207B2 - Fuel tank support structure for motorcycles - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a fuel tank support structure most suitable for a motorcycle or a scooter type motorcycle having a fuel tank mounted on a rear portion of a vehicle body frame, and particularly to an increase in capacity thereof. And the stabilization of the support state.

[Conventional technology]

For example, in scooter type motorcycles and tricycles, a seat is often mounted above a rear portion of a vehicle body frame, and a fuel tank is mounted by making good use of a limited space below the seat. And, as a support structure of this fuel tank, conventionally,
There has been a structure in which a fuel tank is arranged so as to straddle one main frame or suspended between two frames.
However, in such a conventional support structure, it is necessary to form a recess in the tank corresponding to the shape of the frame in order to avoid interference with the above-mentioned frames, and the tank capacity is reduced accordingly, and the recent increase in tank capacity. Can not meet the request.

Therefore, as a conventional support structure capable of increasing the tank capacity, for example, as described in Japanese Patent Application No. 59-95684, the front portion of the fuel tank is supported by the rear end portion of the main frame, and There is one in which the rear portion is further extended rearward. With this support structure, the rearward extension portion of the fuel tank is not affected by the shape of the frame, so the capacity can be increased accordingly.

[Problems to be solved by the invention]

However, in the above support structure, since the fuel tank is supported in an overhang shape, the size of the rearward extension portion, that is, the overhang portion is naturally limited, and the support state tends to be unstable.

The present invention has been made to solve such conventional problems, and an object of the present invention is to provide a fuel tank support structure for a motorcycle, which can increase the tank capacity and can stably support the fuel tank.

[Means for solving problems]

According to the present invention, in a motorcycle having a fuel tank mounted on a rear portion of a vehicle body frame, the vehicle body frame includes a main frame and a tank support frame fixed to a rear end of the main frame. A flat plate-shaped tank receiving portion extending rearward is formed in the frame, and a reinforcing flange portion is bent downward at the periphery of the tank receiving portion, and the fuel tank is placed and fixed on the tank receiving portion. A mudguard, which is made of resin and is wider than the tank receiving portion and extends closer to the inner surface of the cover, is provided below the tank receiving portion, and a relief portion that bulges upward is formed in the upper portion of the rear wheel of the mudguard. The fuel tank support structure is characterized in that the escape portion is located in a reinforcing flange portion of the tank support frame in a side view.

[Action]

In the fuel tank support structure for motorcycles according to the present invention, the tank receiving portion is formed in a flat plate shape and the reinforcing flange portion is bent downward around the tank receiving portion, so that the size of the tank receiving portion is not so large. The fuel tank can be made larger, the tank capacity can be increased without increasing the weight of the tank support frame, and a resin mudguard that is wider than the tank receiving part and extends close to the inner surface of the cover is installed in the tank receiving part. Since it is arranged on the lower side, the fuel tank can be protected from flying stones, and the escape part is formed to bulge upward in the upper part of the rear wheel of the mudguard, and the escape part is used for reinforcing the peripheral edge of the tank receiving part in a side view. Since it is located inside the flange, the required rear wheel stroke can be secured without increasing the vehicle height. Further, since the fuel tank is mounted on the flat plate-shaped tank receiving portion, it is possible to greatly stabilize the support state as compared with the conventional overhang-like support.

〔Example〕

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

1 to 8 are views for explaining a fuel tank support structure for a scooter type motorcycle according to an embodiment of the present invention. In the figure, reference numeral 1 is a scooter type motorcycle, and a vehicle body frame of the motorcycle 1 includes a main frame 2 made of steel pipe and a tank support frame 33 fixed to a rear end of the main frame 2. In the front half of the main frame 2, there is integrally formed a footrest plate mounting portion composed of a bottom portion 2a, front and rear rising portions 2b, 2c, and in the rear half thereof, horizontally following the upper end of the rear rising portion 2c. The extending upper piece 2e is formed. The fork 4 supporting the front wheels 3 is pivotally supported by the steering shaft cylinder formed at the upper end of the front rising portion 2b, and the swing arm integrated engine unit 6 supporting the rear end 5 is supported at the lower end of the rear rising portion 2c. Is pivotally supported. Further, the leg shield 12 is provided on the front rising portion 2b of the main frame 2.
However, a footrest plate 15 is provided on the bottom side 2a, a seat 7 is provided above the upper piece 2e, and a cover body 9 is provided below the seat 7.
Side covers 20 each including a skirt 10 are attached.

Further, on the support bracket 2f formed on the upper surface of the front end corner portion of the upper side portion 2e of the main frame 2, the battery is
A battery box 22 accommodating 23 is fixed by bolts, and the bottom plate 7 of the seat 7 is pivotally supported by a support pin 7b at the front end of the box 22. A seat lock bracket 2g that supports the seat lock device 32 is welded and fixed to the upper surface of the rear portion of the upper side portion 2e.

The tank support frame is provided at the rear end of the upper side 2e.
33 is stuck. The tank support frame 33 is composed of a fixed portion 33a and a tank receiving portion 33b, and has a generally rectangular shape in a plan view in which a reinforcing flange portion 33c is bent downward at the periphery. The fixing portion 33a is welded and fixed to the rear end portion of the upper side portion 2e, and has the same height as the axis of the upper side portion 2e. Further, the tank receiving portion 33b extends rearward after the fixing portion 33a, is positioned at substantially the same height as the lower surface of the upper side portion 2e, and has a flat plate shape. Further, the fixed portion of the tank support frame 33
A leg portion of the gate type bracket 26 is bolted and fixed to the portion 33a, and the bracket 26 straddles the seat lock bracket 2g.

The fuel tank 8 is the tank support frame 33.
The gauge portion 8a, which is placed on the tank receiving portion 33b of the fuel tank 8 and has a convex shape formed in the front portion of the fuel tank 8 and stores the level gauge, is provided between the gate-shaped bracket 26 and the seat lock bracket 2g. Has been inserted into. Then, the upper surface and the front surface of the fuel tank 8 come into contact with the rear wall of the press bracket 31 and the seat lock bracket 2g bolted to the gate bracket 26 through the pads 27b and 27f, respectively, and the gauge portion 8a has Seat lock bracket 2g, gate bracket 2 on the left and right walls via pads 27d and 27e, respectively
It is in contact with the inner wall of 6. At the rear end of the tank support frame 33, a tail light 29 and a license bracket 30 are provided.
A support column 28 for supporting the is fixed by bolting.
A pressing member 28a is formed on the front side of the column 28,
The pressing member 28a is connected to the fuel tank 8 via a pad 27g.
The rear end is being pressed.

A mudguard 24 is arranged below the upper side portion 2e of the main frame 2 and the tank support frame 33. The mudguard 24 is made of resin, a flange portion 24b is bent upward at the peripheral edge, and a tank support portion 24a is formed at the front portion. The tank support portion 24a extends to the left and right at substantially the same height as the axis of the upper side portion 2e of the vehicle body frame 2, and the left and right ends thereof are the side cover 20a.
Is in contact with the sound absorbing plate 35 attached to the inner surface of the. A lubricating oil tank 25 is arranged on the tank support portion 24a so as to straddle the upper side portion 2e, and an engaging projection formed on the lower surface of the tank 25 is formed on the tank support portion 24a. It engages with the engagement hole 24c. Further, the front wall of the lubricating oil tank 25 is in contact with the battery box 22, and the bottom surface is a pad 27.
The rear wall formed in a slope shape on the upper side portion 2e via h is in contact with the front wall of the seat lock bracket 2g and the front surface of the gauge portion 8a of the fuel tank 8 via the pads 27a and 27c, respectively. An oil hole 26 for introducing continuous lubricating oil from the lubricating oil tank 25 to the oil pump is disposed on the lower surface of the tank supporting portion 24a, and is clamped by a clamp portion 24e formed on the lower surface.

In addition, the rear wheel cover portion 24d at the rear of the mudguard 24
Has a shape that covers the lower portion of the tank support frame 33, and an engagement piece 24e protruding from the rear wheel cover portion 24d engages with an engagement hole of the tank support frame 33. Further, the upper portion of the rear wheel 5 of the rear wheel cover portion 24d is a relief portion that is bulged upward, and the relief portion is located inside the flange 33c of the tank receiving portion 33b in a side view. . The left and right edges of the rear wheel cover portion 24d are in contact with the sound absorbing plate 35 attached to the inner surface of the cover 20 at a position above the lower edge of the side cover 20. Also, this rear wheel cover part
An ignition coil 34 is disposed on 24d, and a wire harness 37 connected to the tail lamp 29 is wired on the rear wheel cover portion 24d, and a clamp portion 24f protruding from this is provided. Is clamped by.

 Next, the function and effect of this embodiment will be described.

In this embodiment, to assemble the fuel tank 8,
First, the fuel tank 8 is placed on the tank receiving portion 33b with the tank holding bracket 31 and the column 28 removed, and in this state, the gauge portion 8a is inserted between the seat lock bracket 2g and the gate bracket 26. Then, the tank holding bracket 31 and the column 28 are attached. Then,
While the fuel tank 8 is placed on the flat tank receiving portion 33b, the front portion and the rear portion are pressed, and the holding state is extremely stabilized.

Further, in this embodiment, the tank receiving portion 33b extends rearward at the height of the lower surface of the upper piece 2e of the vehicle body frame 2, so that the fuel tank 8 avoids the conventional interference with the vehicle body frame. Therefore, it is not necessary to form the bottom surface of the tank in a concave shape, the tank capacity can be increased accordingly, and since the reinforcing flange portion 33c is bent downward around the tank receiving portion 33b formed in a flat plate shape, the tank receiving portion 33b is formed. It is possible to make the fuel tank 8 large without making the size of the tank so large, and the tank capacity can be increased without increasing the weight of the tank support frame 33.

Also, the resin mudguard 24 wider than the tank receiving portion 33b
Is disposed below the tank receiving portion 33b, the fuel tank 8
Can be protected from flying stones, and further, the escape portion is formed to bulge upward in the upper portion of the rear wheel of the mudguard 24, and the escape portion is located in the reinforcing flange portion 33c at the periphery of the tank receiving portion 33b in a side view. As a result, the required rear wheel stroke can be secured without increasing the vehicle height.

Furthermore, in this embodiment, since the mudguard 24 is located close to the inner surface of the cover 20 at a position above the lower edge of the side cover 20, it is possible to reliably cover the lower parts of the fuel tank 8, the lubricating oil tank 25, and the like. It is possible to improve the mudguard effect on these tanks and frames. Furthermore, since the mudguard 24 is provided with the clamps 24e and 24f to clamp the oil hose 36 and the wire harness 37, the oil hose 36
Can be prevented from contacting the cylinder head of the engine unit 6, and the space near the mudguard 24 can be effectively used.

Although the tank support frame 33 is narrower in width than the fuel tank 8 in the above embodiment, the tank support frame 33 may be wider than the fuel tank 8 if necessary. For example, even when a load is applied from the lateral direction due to a fall or a collision, the tank support frame functions as a protective member and can protect the fuel tank.

Further, although the scooter type motorcycle has been described in the above-mentioned embodiment, the present invention is of course applicable to other types of motorcycles.
Furthermore, it can also be applied to a scooter-type motorcycle with one front wheel and two rear wheels.

〔The invention's effect〕

As described above, according to the fuel tank supporting structure for a motorcycle according to the present invention, the tank supporting frame is fixed to the rear end of the vehicle body frame, and the reinforcing flange portion is provided around the tank receiving portion formed in a flat plate shape. Since it was bent downward,
It is possible to increase the size by overhanging the fuel tank without increasing the width of the tank receiving part so much, which has the effect of increasing the tank capacity without increasing the weight of the tank support frame. Since the resin mudguard, which is wider than the inner part and is close to the inner surface of the cover, is placed under the tank receiving part, it has the effect of protecting the fuel tank from flying stones, and furthermore, the relief part is located above the rear wheel of the mudguard. Since the relief portion is formed to bulge out and is located in the reinforcing flange portion at the peripheral edge of the tank receiving portion in a side view, the necessary rear wheel stroke can be secured without increasing the vehicle height.

[Brief description of drawings]

1 to 8 are views for explaining a fuel tank support structure for a motorcycle according to an embodiment of the present invention. FIGS. 1 and 2 are a plan view and a side view of a tank support frame portion, respectively. FIG. 3 is a side view of the above embodiment, FIG. 4 is a plan view thereof, FIGS. 5 and 6 are plan views, side views, and FIG. 7 of a mudguard portion, respectively, and FIG. FIG. 3 is a side view of a scooter type motorcycle to which the above embodiment is applied. In the figure, 1 is a scooter type motorcycle, 2 is a vehicle body frame, 2e is an upper side portion (rear portion of the vehicle body frame), 8 is a fuel tank, 33 is a tank support frame, and 33b is a tank receiving portion.

Claims (1)

(57) [Claims] 1. A fuel tank support structure for a motorcycle, comprising a fuel tank mounted on a rear portion of a vehicle body frame and a surrounding portion covered with a cover, wherein the vehicle body frame is fixed to a main frame and a rear end of the main frame. A tank supporting frame is provided, and a flat plate-shaped tank receiving portion extending rearward is formed on the tank supporting frame, and a reinforcing flange portion is bent downward at the periphery of the tank receiving portion, A fuel tank is placed and fixed on the tank receiving part, and a mudguard made of resin, which is wider than the tank receiving part and extends close to the inner surface of the cover, is arranged below the tank receiving part. An escape portion that bulges upward is formed in an upper portion, and the escape portion is located in the reinforcing flange portion of the tank support frame in a side view. Two, tricycle fuel tank supporting structure.