JP2631943B2 - Scooter type motorcycle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scooter type motorcycle capable of preventing overheating of a fuel tank and lowering the center of gravity.

[0002]

2. Description of the Related Art There is a two-wheel scooter type vehicle having a low-floor type substantially plate-shaped footrest between a steering wheel and a driver's seat, and a rear cover at least above an engine and rear wheels. In this type of conventional vehicle, the fuel tank is usually arranged facing the bottom plate of the operation seat at the upper portion inside the rear cover. However, there is a problem that the heat of the engine is easily stored in the rear cover particularly at the upper portion, and the fuel tank is overheated.

[0003] Further, it is required to increase the capacity of the fuel tank. However, if the large-capacity fuel tank is arranged facing the bottom plate of the seat as in the prior art, the position of the center of gravity of the vehicle becomes undesirably high. It is conceivable to install a fuel tank inside the footrest
However, in this case, increasing the tank capacity
It is necessary to shift the pivot axis position of the
Base increases.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and despite the fact that the fuel tank is disposed in a space common to the cover that covers the power unit, the fuel tank is unlikely to be overheated. Also improves the cooling of the car, without increasing the center of gravity of the car and increasing the wheelbase
It is an object of the present invention to provide a scooter-type motorcycle capable of increasing the capacity of a fuel tank without causing the fuel tank to increase in capacity.

[0005]

According to the present invention, an object of the present invention is to provide a low-floor, substantially plate-shaped footrest provided between a steering handle and an operation seat, an engine located behind the footrest, and an engine. In a scooter-type motorcycle having a power unit that is integrated with a transmission case extending rearward from the rear wheel and that can swing up and down, the motorcycle stands upright and rearward from the rear of the footrest.
Gently from above to the power unit diagonally upward and backward
A pair of left and right rear frames that extend in an inclined manner, and this rear frame
The power unit is provided at an upright portion behind the footrest of the frame.
A pivot shaft for pivotally supporting the knit, rear frame close to the forwardly disposed partly of the pair of left and right pivot shaft
Between the uprights of the arm and from the bottom of the footrest to the front
A fuel tank that rises to above the upper surface of the footrest; and a cover that continuously covers from the periphery of the power unit to the periphery of the fuel tank. The scooter type motorcycle is characterized in that a cooling air passage leading to the vehicle is formed.

[0006]

FIG. 1 is a side view of an embodiment of the present invention, and FIG.

In these figures, reference numeral 10 is a frame.
The frame 10 includes a steering barrel 12 and a down tube 1.
4 and a pair of left and right side frames 16 (16a, 16b) extending rearward and obliquely upward from the lower end of the down tube 14.

Here, the rear end of the down tube 14 is described later.
Extending to the vicinity of the front of the footrest 64, the side tube 16
The front part extends horizontally below the footrest 64 and extends backward.
Standing up and down.

[0009] The upper portion of the upright portion 16A is described later ene
It is bent backward at the height near the top of the gin 24 and
Gently slopes toward the back. Both sides
Between the tubes 16 from near the upper part of the upright portion 16A.
A space extending toward the rear of the footrest 64 is formed.
A fuel tank 52 to be described later can be accommodated in the space. The steering shaft held rotatably left and right by the steering shaft barrel 12 includes:
A front steering wheel 18 and a steering handle 20 are mounted.

Reference numeral 22 denotes a power unit, in which a forced air-cooled two-cycle upright rear wheel drive engine 24 and a transmission case 26 are integrally assembled, and viewed from the side (FIG. 1) and the plane (FIG. 2). It is formed in a substantially L-shape. That is, the engine 24 is located in front of the rear wheel 28 attached to the rear end of the transmission case 26,
0 and a piston 32 that tilts slightly backward and moves vertically.

On the side of the engine 24 opposite to the transmission case 26, an intake air cleaner 34 is mounted. In the intake purifier 34, first and second chambers 38a, 38b are defined on the left and right by a filter 36, and the first chamber 38a has a second chamber 38a.
A carburetor 40 is provided so as to communicate the chamber 38b with the crank chamber. As a result, the intake air entering the first chamber 38a from the intake port 42 formed in the first chamber 38a is filtered by the filter 3
6. The air is sucked into the crank chamber through the second chamber 38b, the carburetor 40, and further through a reed valve (not shown).

[0012] the front end of the power unit 22, a left-right pair
The pivot shaft to the standing portion 16A of the side tubes 16 of the
At 16B, it is vertically swingably connected, and its rear portion is elastically supported by a buffer unit 44. The side tube 16 extends to a height near the upper edge of the rear wheel 28, and has a battery 46, a lubricating oil tank 48,
An accessory case 50 is provided.

Reference numeral 52 denotes a synthetic resin fuel tank made by blow molding. This tank 52 is made vertically long with a width between the left and right side tubes, and
4, that is, close to the pivot shaft 16 </ b> B. The rear part of the fuel tank 52 is inclined obliquely upward and rearward.
Upright portion 1 of inclined left and right side tubes 16a, 16b
Enter between 6A from the front.

[0014] The upper portion of the fuel tank 52 is pivot
Above axis 16B. The lower part of the fuel tank 52
The left and right side tubes 16a, 16 near the rear of the table 64
b and is located below the footrest 64. For this reason
Capacity of fuel tank 52 without increasing wheelbase
Can be increased. A cap 54 is attached to a lubrication port located at a front edge of an upper portion of the tank 52.
An electromagnetic fuel pump 55 is attached to the bottom of the tank 52 and sends the fuel to the carburetor 40.

Reference numeral 56 denotes a rear cover.
And continuously covers from the periphery of the power unit 22 to the periphery of the fuel tank 52. That is, the rear cover 56 is formed so as to cover the battery 46, the oil tank 48, the side of the accessory case 50 from the front of the fuel tank 52, and the upper side of the engine 24 and the rear wheel 28. It is attached to open and close freely.
A portion of the rear cover 56 in front of the fuel tank 52 is a cover plate 60 that can be opened and closed. By opening the cover plate 60, fuel is injected into the tank 52.

[0016] The rear cover 56 and a plurality of slits 62 are open as a cooling wind intake in a position facing the side surface of the fuel tank 52, the running wind flows from the 52 side tank rear cover 56, rear cover 56 and the fuel The cooling air is guided to the periphery of the power unit through a cooling air passage 56 </ b> A formed in a gap with the tank 52. Therefore, the cooling performance of the inside of the rear cover 56 and the fuel tank 52 is further improved. In particular, the cooling air that has entered the rear cover 56 through the slit 62 is smoothly guided to the periphery of the engine by the wind guiding function of the outer wall surface of the fuel tank 52.

[0017] The lower part of the fuel tank 52 of the footrest 64
Because it is located at the bottom, heat it with radiant heat on the road surface, especially in summer.
However, cooling is performed on the outer surface of the fuel tank 52.
Cooling is good because the wind flows. Reference numeral 64 denotes a low-floor, substantially plate-shaped footrest, which is located below the steering handle 20 and the operation seat 58.

According to this embodiment, the near the front lower portion of the rear cover 56 to the fuel tank 52 is positioned rear cover 5
The cooling air passage formed by the gap between the fuel tank 6 and the fuel tank 52
Since the passing cooling air is guided, the heat of the engine 24 is less likely to be trapped . Thermal Ya of this for the fuel tank 52 engine 24
It does not overheat due to radiant heat on the road surface . For this reason, evaporation of fuel is also reduced.

The tank 52 is vertically long and its width can be widened in accordance with the distance between the side tubes 16.
The capacity can be increased. Since the lower portion of the tank 52 is lower than the footrest surface of the footrest 64, the center of gravity of the entire vehicle body is sufficiently low even when the capacity of the tank 52 is increased, so that the running stability is good.

In this embodiment, since the tank 52 is vertically long, the movement of the fuel inside the vehicle in the front-rear direction during traveling is reduced. For this reason, it is possible to suppress the movement of fuel at the time of rapid acceleration / deceleration or at the time of going up or down a slope, and it is not necessary to provide a partition wall in the tank 52 for preventing air from being sucked into the pump 55.

[0021] As a result, the tank 52 also enables it to be made of synthetic resin by blow molding, it is also lightweight and inexpensive compared with metal tanks. In this embodiment, since the tank 52 is disposed so as to be sandwiched between the side tubes 16 in this embodiment, it is difficult for an external impact to directly apply to the tank 52, and the tank 52 can be protected at the same time.

Further , the seat height can be sufficiently reduced as compared with the case where the capacity of the fuel tank arranged to face the bottom plate of the seat is increased.

[0023]

According to the present invention as described above, before the end of the engine
Near the pivot axis that supports the front of this pivot axis
The fuel tank is disposed on the power unit, and is continuously covered with a cover from the periphery of the power unit to the periphery of the fuel tank.A cooling air passage is provided between the fuel tank and the cover, and traveling air is passed through the cooling air passage through the cooling air passage. road from and guides around, from the periphery of the fuel tank not only the fuel tank can be arranged to heat buildup difficult position of the engine through the cooling air, a fuel tank in the heat and in summer the engine
Fuel evaporation can be suppressed without being overheated by the radiant heat from the fuel cell.

[0024] The pivot shaft of the power unit fuel tank
Since the cooling air passing through the periphery of the fuel tank is guided to the fuel tank and guided directly and smoothly to the power unit, the cooling performance of the power unit is also improved. In this case, since the outer wall of the fuel tank is used as a guide for traveling wind, there is no need to add a separate guide member.

[0025] Furthermore, since the arrangement position of the fuel tank is sufficiently low, the vehicle center of gravity even if those of larger capacity becomes sufficiently low, the running stability is good. Here the fuel tank is under the footrest
Because it rises from the upper part to the upper part of the footrest,
Tank capacity without increasing
You.

[Brief description of the drawings]

FIG. 1 is a side view of one embodiment of the present invention.

FIG. 2 is a plan view with a part omitted.

[Description of Signs] 6 Side tube 6A as rear frame 6 Standing part 6B Pivot shaft 0 Steering handle 4 Engine 8 Rear wheel 2 Piston 2 Fuel tank 6 Rear cover as cover 56A Cooling air passage 58 Operation seat 64 Footrest

Claims (1)

(57) [Claims] 1. A low-floor, substantially plate-shaped footrest provided between a steering wheel and an operation seat, an engine located behind the footrest, a transmission case extending rearward from the engine, and a rear wheel. in a scooter type motorcycle and a vertically swingable power unit bets are integrated, after the footrest
From the upper part of the power unit
After a pair of left and right
Part frame and the rear frame behind the footrest.
Pivot shaft provided on an upright portion and supporting the power unit
And a part thereof disposed in front of and near the pivot axis.
Between the upright portions of the pair of left and right rear frames
From the lower part of the footrest to the upper part of the upper surface of the footrest
A fuel tank, and a cover that continuously covers from the periphery of the power unit to the periphery of the fuel tank,
A scooter-type motorcycle, wherein a cooling air passage for guiding running wind around the power unit is formed by the fuel tank and the cover.