JPH1067370A - Scooter type vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain both improvement of riding comfortableness and securing of the capacity of a storage box by arranging a cylinder part and a carburetor in such a state that a common tangential reference line which is in contact with a front end contour of the cylinder part and the top contour of the carburetor is in approximately parallel to the flat bottom of the storage box. SOLUTION: A storage box 8 is installed in the front part of a rear body 7 and has a capacity of storing a full-face helmet 11, and its bottom face 8a, which is formed into approximately flat, is so formed as gradually being risen toward the rear. A cylinder part 12 and a carburetor 22 are formed to be in approximately parallel to the bottom face 8a of the storage box 8 by setting a common tangential straight line which is in contact with the contour of the front end top part of the cylinder part 12 and the top contour of the carburetor 22 as a reference line A-A. This constitution can provide both improving of the riding comfortableness and securing of the capacity of the storage box 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scooter type vehicle in which a storage box is provided below a seat and a unit swing type engine is disposed below the storage box.

[0002]

2. Description of the Related Art In order to lay a step board portion in front of a seat, a layout is adopted in which a rear body on which the seat is mounted is set to a relatively large volume, a storage box is provided inside, and a unit swing type engine is disposed below the storage box. This is a feature of scooter type vehicles.

FIG. 7 is a left side view showing an example of a conventional scooter type vehicle. This scooter type vehicle has a steering wheel c
The front wheel a, which is steered by the steering wheel, and the rear wheel b, which is driven by the unit swing type engine d, are arranged in front and rear. The gap between the steering wheel c and the seat e is low and the step board f is laid. It is mounted on a rear body h containing a box g, and a unit swing type engine d is arranged below the rear body h.

A unit swing type engine d has a crankcase having a cylinder portion i extending substantially horizontally forward.
And a swing case k connected to one side (for example, the left side) of the crank case j and extending rearward.
The rear wheel b is located immediately behind the crankcase j.

The crank case j is provided with a pair of left and right support arms 1 extending forward.
A pivot shaft m extending in the vehicle width direction and supported at the tip of the frame n is supported by the frame n. For this reason, the unit swing type engine d can swing up and down about the pivot axis m with respect to the frame n, and is buffer-suspended by the rear upper portion of the swing case k being supported by the rear cushion unit o.

The exhaust pipe p extends downward from the cylinder portion i, and the intake pipe q is introduced into the front upper surface of the crankcase j. The carburetor r connected to the intake pipe q is located above and behind the crankcase j, and the air cleaner s is further connected to the rear. The exhaust pipe p, the intake pipe q, the carburetor r, the air cleaner s, and the like are also components of the unit swing type engine d, and rotate up and down around the pivot axis m together with the unit swing type engine d.

[0007]

In such a scooter-type vehicle, if the stroke amount of the rear cushion unit o is to be increased while emphasizing the riding comfort, the rear cushion unit o is arranged in a projecting shape directly below the storage box g. Since the cylinder portion i and the carburetor r interfere with the bottom surface of the storage box g, the bottom position of the storage box g must be raised. Therefore, it has been difficult to achieve both improvement of the riding comfort and leg fitting and securing of the capacity of the storage box g.

The present invention has been made to solve this problem, and an object of the present invention is to provide a scooter-type vehicle that can achieve both improvement in riding comfort and securing of the capacity of a storage box. .

[0009]

In order to achieve the above object, a scooter-type vehicle according to the present invention has a step board portion in which a gap between a steering wheel and a seat is deepened, and a storage box is provided in a rear body below the seat. A crankcase provided with a cylinder portion extending substantially horizontally forward under the rear body, a swing case connected to the crankcase and extending rearward, and supporting a rear wheel at a rear portion, and a crankcase rear portion. A unit swing type engine unitized by a carburetor arranged above and an air cleaner arranged behind the carburetor is suspended in a swingable manner about a pivot shaft provided at the front of a crankcase. In a scooter-type vehicle, the bottom surface of the storage box is formed almost flat, and the front end of the cylinder Wherein the common tangential reference line in contact with the contour and the upper contour of the carburetor is arranged cylinder portion and the carburetor so as to be substantially parallel to the bottom surface of the storage box.

[0010] With this configuration, the upper side profile of the unit swing type engine below the bottom surface of the storage box is flattened, and the cylinder portion and the carburetor do not protrude greatly upward alone. It is possible to shorten the approach distance to the bottom surface of the storage box when turning. Therefore, it is possible to increase the stroke amount of the rear cushion unit without raising the position of the bottom of the storage box, and to achieve both improvement in riding comfort and securing the capacity of the storage box.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 1 is a left side view of a scooter type vehicle showing one embodiment of the present invention, FIG. 2 is a plan view, and FIG. 3 is a right side view.

This scooter type vehicle includes a front wheel 1 steered by a steering wheel 3 and a rear wheel 2 driven by a unit swing type engine 4. The rear body 7 on which the seat 5 is placed is set to have a relatively large volume, and a unit swing type engine 4 integrated with the rear wheel 2 is disposed below the rear body 7.

In the rear body 7, a storage box 8 is provided at a front portion, and a fuel tank 9 and an oil tank 10 are provided at a rear portion.
Is arranged. The storage box 8 has a volume capable of storing the full-face helmet 11, and is shaped so that the substantially flat bottom surface 8a rises.

The unit swing type engine 4 is provided with a crankcase 13 having a cylinder portion 12 extending substantially horizontally forward, and connected to one side (for example, the left side) of the crankcase 13 to extend rearward and to extend rearward. It is unitized by a swing case 14 that supports the rear wheel 2 and the like. The rear wheel 2 is located immediately behind the crankcase 13.

A pair of left and right support arms 15 extending forward are provided at the front lower portion of the crankcase 13. A pivot shaft 16, which extends over the distal end of the support arm 15 and extends in the vehicle width direction, is mounted on a frame 17. It is pivoted. For this reason, the unit swing type engine 4 can swing up and down about the pivot shaft 16 with respect to the frame 17, and is supported by the rear cushion unit 18 at the rear upper portion of the swing case 14 so as to be buffer-suspended.

An exhaust pipe 19 extends downward from the lower surface of the cylinder portion 12, and the exhaust pipe 19 is bent backward to form a muffler 20 disposed on the side of the rear wheel 2 opposite to the swing case 14. Continuous. Exhaust pipe 19 and muffler 2
Numeral 0 rotates up and down around the pivot shaft 16 integrally with the unit swing type engine 4.

On the other hand, above the unit swing type engine 4 and below the storage box 8, an intake pipe 21, a carburetor 22, and an air cleaner 23 are arranged in order from the front side of the vehicle. A front end of the intake pipe 21 is introduced into a front upper surface of the crankcase 13, a carburetor 22 is connected to a rear end of the intake pipe 21, and an air cleaner 23 is connected to a rear part of the carburetor 22. These components 21, 22, and 23 also rotate vertically about the pivot shaft 16 integrally with the unit swing type engine 4.

Here, as shown in FIG. 1, when a common tangential straight line that is in contact with the upper contour of the front end of the cylinder portion 12 and the upper contour of the carburetor 22 in a side view is imagined as a reference line AA, The cylinder portion 12 and the carburetor 22 are arranged such that the reference line AA is substantially parallel to the bottom surface 8a of the storage box 8. The carburetor 22 has a float chamber 27 (see FIG. 4) provided in a lower part thereof, which is formed between the crankcase 13 and the rear wheel 2 in a plan view U.
Because it is housed in the letter-shaped groove 32 (see FIG. 2),
Its height is low enough.

Further, an oil pump 25 is provided on the upper surface of the crankcase 13 as shown in FIG. This oil pump 25 is a crankcase of the intake pipe 21.
It is arranged right beside (for example, the left side) the introduction part to the space 13.

The unit swing type engine 4 is of a forced air cooling type, and a blower fan casing 26 having a shape covering up to the cylinder portion 12 is attached to one side (for example, the right side) of the crankcase 13 and the inside thereof is provided. Is provided with a blower fan (not shown) driven by a crankshaft, and cooling air generated by the blower fan is guided to the cylinder portion 12 to cool the cylinder portion 12.

The front and rear positions of the uppermost part of the blower fan casing 26 are positioned so as to be arranged beside the intake pipe 21 and the oil pump 25, and the height thereof is suppressed to be equal to or less than the above-mentioned reference line AA. . An ignition coil 24 is provided in the upper front part of the crankcase 13 and on the opposite side (here, the left side) of the blower fan casing 26.

The scooter-type vehicle constructed as described above has a cylinder portion 12 of the unit swing type engine 4.
And the carburetor 22 are arranged so that the common tangential reference line AA is substantially parallel to the bottom surface 8a of the storage box 8, so that the upper side profile of the unit swing type engine 4 below the bottom surface 8a is It is flattened, and the cylinder portion 12 and the carburetor 22 do not protrude largely upward alone.

Therefore, the approach distance to the bottom surface 8a when the unit swing type engine 4 is turned to the uppermost position can be shortened, and the stroke of the rear cushion unit 18 can be increased without raising the position of the bottom surface 8a. Thus, it is possible to improve the ride comfort and secure the capacity of the storage box 8 at the same time.

By the way, as shown in FIGS. 1 and 3,
For example, if a common tangential straight line contacting the upper end of the side profile of the oil pump 25 protruding above the crankcase 13 and the upper end of the side profile of the air cleaner 23 is imagined as a reference line XX, the carburetor 22
The carburetor 22 is installed such that the upper end of the side profile coincides with or is lower than the reference line XX.

As shown in FIG. 4, the carburetor 22 has a throttle lever 29 located on a side surface, a throttle lever box 28 attached thereto, a throttle cable 30 led out forward from the front surface thereof, and a projection on the upper surface portion. Is not used. As described above, the float chamber 27 is set low so as to fit in the U-shaped groove 32 formed between the crankcase 13 and the rear wheel 2 in plan view.

Thus, when the unit swing type engine 4 swings around the pivot shaft 16, the side profile of the upper surface swings along with the reference line XX,
Bottom 8a and the fuel tank 9 of the storage box 8, the positional relationship and the swinging locus of the oil tank 10 is simplified, in the case of maximum rocking stroke, the form shown in X ₁ -X _1.

Thus, in addition to the effect of the reference line AA, the stroke amount of the rear cushion unit 18 is increased, the riding comfort is improved, and the height of the seat 5 is reduced to improve the footing. The capacity of the storage box 8 can be expanded without difficulty.

Further, as shown in FIG.
5 and a common tangential straight line contacting the upper end of the side profile of the rear wheel 2 with the reference line Y−
Virtually as Y, carburetor 22 and air cleaner 2
The carburetor 22 and the air cleaner 23 may be installed such that the upper end of the side profile of the third unit 3 coincides with or is lower than the reference line YY.

In this case, when the unit swing type engine 4 swings around the pivot shaft 16, the side profile of the upper surface portion swings along with the reference line YY.
Bottom 8a and the fuel tank 9 of the storage box 8, the positional relationship and the swinging locus of the oil tank 10 is simplified, in the case of maximum rocking stroke, the form shown in Y ₁ -Y _1.

As a result, the stroke amount of the rear cushion unit 18 is also increased to improve the riding comfort, the height of the seat 5 is reduced to improve the footing, and the capacity of the storage box 8 is further increased. Is possible without difficulty.

Regardless of which of the reference lines XX and YY is set, there is no protrusion above the reference line XX or YY, so that interference with the vehicle body can be easily avoided and the unit swing type can be used. Workability when attaching and detaching the engine 4 to and from the vehicle body is greatly improved.

Further, when the above-mentioned reference line AA and the above-mentioned reference lines XX and YY are set, the pivot shaft is set above the front of the crankcase 13 (for example, FIG. 3). 16a), and the unit swing type engine 4 may be a water-cooled type or a natural air-cooled type in addition to the forced air-cooled type.

[0034]

As described above, in the scooter type vehicle according to the present invention, the bottom surface of the storage box is formed to be substantially flat, and the upper contour of the front end of the cylinder portion of the unit swing type engine and the upper contour of the carburetor in side view. The cylinder part and carburetor are arranged so that the common tangential reference line that contacts the bottom of the storage box is substantially parallel to the bottom of the storage box, so that the approach distance to the bottom of the storage box when the unit swing type engine is turned up most is reduced. This makes it possible to increase the stroke of the rear cushion unit without raising the position of the bottom surface of the storage box, thereby achieving both improvement in riding comfort and securing the capacity of the storage box.

[Brief description of the drawings]

FIG. 1 is a left side view of a scooter type vehicle showing an embodiment of the present invention.

FIG. 2 is a plan view of the scooter type vehicle.

FIG. 3 is a right side view of the scooter type vehicle.

FIG. 4 is an enlarged side view of the carburetor.

FIG. 5 is an enlarged plan view of the oil pump.

FIG. 6 is a left side view showing another embodiment of the scooter type vehicle.

FIG. 7 is a left side view of a conventional scooter type vehicle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front wheel 2 Rear wheel 3 Handle 4 Unit swing type engine 5 Seat 6 Step board 7 Rear body 8 Storage box 8a Bottom of storage box 12 Cylinder part 13 Crank case 14 Swing case 16 Pivot shaft 22 Carburetor 23 Air cleaner A-A Reference line

Claims (1)

[Claims] A crankcase having a cylinder portion extending substantially horizontally forward under a rear body, wherein a storage box is installed in a rear body below the seat, and a step board portion is provided between the handle and the seat. And a swing case connected to the crankcase and extending rearward to support the rear wheel at the rear, a carburetor disposed above the rear of the crankcase, and an air cleaner disposed behind the unit. In a scooter type vehicle in which a unit swing type engine is suspended so as to be able to swing up and down around a pivot shaft provided at a front part of a crankcase, a bottom surface of a storage box is formed substantially flat and a side view is provided. The common tangent reference line that touches the upper contour of the front end of the cylinder part and the upper contour of the carburetor is a storage box A scooter-type vehicle characterized in that a cylinder portion and a carburetor are arranged substantially parallel to a bottom surface of the scooter.