JPH0662103B2 - Scooter type vehicle - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scooter type vehicle in which a power unit is covered with a rear cover which extends downward from a peripheral edge of a driving seat and is connected to a rear portion of a footrest.

(Prior Art) A low-floor, substantially plate-shaped footrest is provided between the steering handle and the driver's seat, and a rear cover extending downward from the periphery of the operator's seat and connected to the rear of the footrest provides a rear cover for the engine and rear wheels. There are a few scooter type vehicles that cover at least the top.
In the conventional vehicle of this type, the fuel tank is usually arranged facing the bottom plate of the driving seat in the upper part of the rear cover. However, there is a problem in that the heat of the engine is likely to remain in the upper portion of the rear cover, and the fuel tank is overheated.

In addition, it is also required to increase the capacity of the fuel tank, but if a large-capacity fuel tank is arranged facing the bottom plate of the seat as in the past, not only will the position of the vehicle body center of gravity increase, but the large capacity below the seat will increase. It becomes difficult to secure a storage space for a large-capacity storage case and batteries.

(Object of the Invention) The present invention has been made in view of such circumstances, and despite the fact that it is arranged in the rear cover, the fuel tank is unlikely to be overheated, and the size of the fuel tank is increased without increasing the vehicle body center of gravity. An object of the present invention is to provide a scooter type vehicle that can be made to have a large capacity and can secure a large space for accommodating a large-capacity storage case, a battery and the like under the seat.

(Structure of the Invention) According to the present invention, the object is to provide a low-floor, substantially plate-shaped footrest provided between the steering handle and the driver's seat, and one side of the engine located behind the footrest. A vertically movable power unit for holding the rear wheel at the rear end of the transmission case extending from the rear to the rear, and extending downward from the peripheral edge of the operation seat to be connected to the rear portion of the footrest to cover the upper portion of the power unit. In a scooter type vehicle including a rear cover, a down tube extending from a steering shaft tube to a front portion of the footrest base and a front portion connected to the downtube so that the rear cover is inclined from the rear portion of the footrest base. A pair of left and right rear frames that tilt upward and backward and then pass through the vicinity of the upper portion of the engine and gently incline rearward, and a plane that is disposed in front of the engine and includes the upper surface of the footrest. On A fuel tank that traverses downward and its upper part is located near the upper part of the upright part of the rear frame, and its lower part enters between the rear frames of the foot stand and the front wall of the rear cover. The fuel tank is provided with an oil inlet opening facing the inside of a lid plate that can be opened and closed, and the engine is an upright type in which a piston moves substantially vertically, while the power unit is the engine and the fuel tank. And a scooter type vehicle characterized by being pivotally supported by the rear frame between.

(Embodiment) FIG. 1 is a side view of a two-wheel scooter which is an embodiment of the present invention, and FIG. 2 is a plan view with a part thereof omitted.

In these figures, reference numeral 10 is a frame. The frame 10 includes a steering shaft tube 12, a down tube 14, and a pair of left and right rear tubes 16 (16) extending diagonally rearward and upward from a lower end of the down tube 14.
a, 16b). Here, the rear end of the down tube 14 extends to the vicinity of the front part of the footrest 64, and the front part of the side tube 16 extends horizontally below the footrest 64 to the rear and then obliquely rises to the rear. . The upper portion of the upright portion is bent rearward at a height near the upper portion of the engine 24 described later, and obliquely slopes backward and extends rearward. A space that extends from the vicinity of the upper portion of the upright portion to the rear portion of the footrest is formed between the side tubes 16, and a fuel tank 52 described later can be accommodated in this space. A steering front wheel 18 and a steering handle 20 are attached to the steering shaft that is rotatably held in the steering shaft tube 12 to the left and right.

A power unit 22 is a forced air-cooled two-cycle upright type rear-wheel drive engine 24 and a transmission case 26 that are integrally assembled, and is omitted when viewed from the side surface (FIG. 1) and the plane (FIG. 2). It is formed in an L shape. Ie engine 2
4 is located in front of a rear wheel 28 attached to the rear end of the transmission case 26, and is provided with a laterally mounted cantilevered crankshaft 30 and a piston 32 that tilts slightly backward and moves vertically. An intake air purifier 34 is provided on the side of the engine 24 opposite to the transmission case 26.
Is installed. Inside the intake air purifier 34, a filter 36 defines left and right first and second chambers 38a and 38b, and a carburetor 40 is connected to the first chamber 38a so as to connect the second chamber 38b and the crank chamber. Is provided. As a result, the first chamber 3 is discharged from the intake port 42 formed in the first chamber 38a.
The intake air that has entered 8a is drawn into the crank chamber through the filter 36, the second chamber 38b, the carburetor 40, and the reed valve (not shown).

A front end of the power unit 22 is pivotally supported by the pair of left and right side tubes 16 so as to be vertically swingable, and a rear portion thereof 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 a battery 46, a lubricating oil tank 48, and a small case 50 are arranged above the side tube 16.

Reference numeral 52 denotes a synthetic resin fuel tank made by blow molding. This tank 52 is the left and right side tubes 1
It is made vertically long with a width between 6a and 16b, and is arranged in front of the engine 24.

The rear portion of the fuel tank 52 enters from the front between the inclined portions of the left and right side tubes 16a and 16b which are inclined rearward. The upper portion of the fuel tank 52 is the upper portion of the standing portion of the side tube 16, that is, the engine 2
It is at a height near the upper part of 4. The lower part of the fuel tank 52 is
The left and right side tubes 16a near the rear of the footrest 64,
It enters between 16b and faces downward. Therefore, the capacity of the fuel tank 52 can be increased without increasing the wheel base.

Further, the lower portion of the fuel tank 52 is located below a plane including the upper surface (foot resting surface) of the foot rest 64, and the upper portion is located above the plane. That is, the fuel tank 52 traverses this plane in the vertical direction. A cap 54 is attached to an oil filling port located at the front edge of the upper portion of the tank 52. An electromagnetic fuel pump 55 is attached to the bottom of the tank 52, and this pump 55 sends the fuel to the carburetor 40.

Reference numeral 56 denotes a rear cover, which extends downward from the peripheral edge of the driving seat 58 and is connected to the rear portion of the footrest 64 to cover the upper side of the power unit. That is, it is formed so as to cover the battery 46, the oil tank 48, the side of the accessory case 50, the engine 24 and the rear wheel 28 continuously from the front of the fuel tank 52 continuously to the rear of the footrest 64, which will be described later. An operation seat 58 is attached to the upper part of the seat so as to be openable and closable.
A portion of the rear cover 56 in front of the fuel tank 52 is a lid plate 60 that can be opened and closed. By opening the lid plate 60, fuel is injected into the tank 52. A plurality of slits 62 are opened in the rear cover 56 at positions facing the side surface of the fuel tank 52 so that traveling wind can flow into the rear cover 56 from the side of the tank 52. Therefore, the cooling performance of the inside of the rear cover 56 and the fuel tank 52 is further improved.

Reference numeral 64 denotes a low-floor, substantially plate-shaped footrest, which is a steering handle 2
It is located below between 0 and the driving seat 58.

According to this embodiment, the heat of the engine 24 is less likely to be retained near the lower front portion of the rear cover 56 where the fuel tank 52 is located. That is, since the bearing mechanism that pivotally supports the power unit 22 is interposed between the engine 24 and the fuel tank 52, not only the gap between the two is widened, but also the power unit 22.
Is oscillated, so that at least a space corresponding to the movable range of the engine 24 is formed between the fuel tank 52 and the space. Further, it is because air easily enters from the lower side between the engine 24 and the fuel tank 52 and flows into the rear cover 56. As a result, the tank 52 does not overheat. Therefore, the evaporation of fuel is reduced. Also the tank 52
Since it is vertically long and its width can be widened according to the interval between the side tubes 16, the capacity can be increased. Since the lower portion of the tank 52 is located lower than the footrest surface of the footrest 64, the center of gravity of the entire vehicle body becomes sufficiently low even when the tank 52 has a large capacity, and running stability is good.

Further, the rear frame 16 is provided with an engine (2
Pass the upper part of 4) and incline gently to the rear,
Since the upper portion of the fuel tank (52) is located near the upper portion of the rising portion of the rear frame (16), the seat (58) is provided above the fuel tank (52) and the rear frame (16).
A sufficiently large space can be secured between and. Therefore, the storage case (50), the battery (46), the lubricating oil tank (48), etc. can be housed here.

Since the tank 52 is vertically long in this embodiment,
The movement of the internal fuel in the front-rear direction during traveling is reduced. For this reason, it is not necessary to provide a partition wall in the tank 52 for suppressing the movement of fuel during sudden acceleration / deceleration or climbing / post-hilling, and for preventing the suction of air into the pump 55. As a result, the tank 52 can be made of synthetic resin by blow molding, which is lighter and cheaper than a metal tank.

Further, since the power unit 22 is pivotally supported by the side tube 16 at the front portion thereof, that is, at a position facing the fuel tank 52, the clearance provided on the fuel tank side can be small in order to avoid interference caused by swinging of the power unit, More suitable for increasing the capacity of the fuel tank. Since the tank 52 is arranged so as to be sandwiched between the side tubes 16 here, it is not necessary to separate the footrest base 64 from the power unit 22,
The capacity of the fuel tank 52 can be increased without increasing the wheel base. Further, an impact from the outside is absorbed by the side tube 16 so that it is less likely to be directly applied to the tank 52, and the tank 52 can be protected at the same time.

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

(Effect of the Invention) As described above, according to the present invention, the engine in the rear cover is made upright and a space is secured in front of the engine in the rear cover, and the fuel tank is arranged there. Since the heat is hard to be retained, the fuel evaporation can be suppressed without overheating the fuel tank. Also, the position of this fuel tank is low enough to traverse the plane including the upper surface of the footrest up and down and the lower part of the footrest rests between the left and right rear frames, increasing the tank capacity. In addition, the weight of the vehicle is sufficiently low and the running stability is good. Moreover, since a part of the fuel tank is inserted between the inclined portions of the rear frame, the tank capacity can be increased without increasing the wheel base. Further, since the power unit is axially supported by the rear frame at a position facing the fuel tank, the clearance provided on the tank side in order to avoid interference with the power unit can be reduced, which is more suitable for increasing the tank capacity. Note that the fuel tank has an oil inlet that faces the inside of the lid plate that can be opened and closed, including the front wall of the rear cover, which slopes upward to the rear, so it is easy to open the lid plate from above the footrest base. Can lubricate. Further, a space for accommodating a large article can be secured above the fuel tank and the rear frame with the seat.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of the present invention, and FIG. 2 is a plan view with a part thereof omitted. 16 ... Side tube as rear frame, 20 ... Steering handle, 22 ... Power unit, 24 ... Engine, 28 ... Rear wheel, 32 ... Piston, 52 ... Fuel tank, 56 ... Rear cover, 58 ... Driving seat, 64 ... Footrest.

Claims (1)

[Claims] 1. A low-floor, substantially plate-shaped footrest provided between a steering handle and a driver's seat, and a rear end of a transmission case located behind the footrest and extending from one side of the engine to the rear. In a scooter type vehicle including a vertically swingable power unit that holds a rear wheel, and a rear cover that extends downward from a peripheral edge of the operation seat and is connected to a rear portion of the footrest and that covers an upper portion of the power unit, One down tube extending from the steering shaft tube to the vicinity of the front part of the footrest and after the front part is connected to the downtube and inclined from the rear part of the footrest to the inside of the rear cover in a slanting rearward direction. A pair of left and right rear frames that extend obliquely upward and backward through the vicinity of the upper part of the engine, and a plane that is disposed in front of the engine and that includes the upper surface of the footrest vertically traverses vertically. A fuel tank whose part is located near the upper part of the standing part of the rear frame and whose lower part enters between the rear frames of the footrest rear part;
The fuel tank is provided with an oil filler opening facing the inside of a lid plate that is openably and closably provided on a rearwardly inclined surface including the front wall of the rear cover, and the engine is an upright type in which a piston moves in a substantially vertical direction. The scooter-type vehicle, wherein the power unit is axially supported by the rear frame between the engine and the fuel tank.