JPH06199261A - Motor scooter - Google Patents

Abstract

PURPOSE:To provide a motor scooter in which troublesome works of cleaning and replacing air cleaner element are reduced, which is embodied in a simple structure, and which presents lesser air resistance in inhalation. CONSTITUTION:A motor scooter 1 is so structured that the body frame 2 between a handle 9 and seat 61 is bent downward, low floor foot rests are provided between the handle 9 and seat 61, and a unit swing engine 13 is installed below the seat 61 and behind the foot rests. The front periphery of this body frame 2 is enclosed with a front cover 63 while the body frame 2 periphery under the seat 61 is surrounded by a rear cover 62, and the body frame portion between the front and rear covers 63, 62 is covered with a foot rest cover 73 so that a substantially closed space A is formed which is in communication with the outside by the upper part of the front cover 63 with the foot rest cover 73 and front cover 63. Through air introducing pipings 92, 91, the rear part of this space A is in communication with the transmission case 17 and/or air cleaner 28.

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 equipped with a unit swing engine supported by a vehicle body so as to be vertically swingable.

[0002]

2. Description of the Related Art In such a scooter type vehicle, a vehicle body frame between a steering wheel and a seat is bent downward, and a foot rest having a low floor is provided between the steering wheel and the seat. There is also a unit swing engine placed behind the footrest. In this unit swing engine, the engine and the transmission case are integrated, the crankshaft of the engine is supported at one end of the transmission case and the axle of the rear wheel is supported at the other end, and the crankshaft and the axle are linked by a power transmission mechanism. Thus, the engine and the transmission case are integrated, the engine is equipped with an air cleaner, and when the power transmission mechanism uses, for example, a V-belt transmission, the transmission case is installed in the transmission case in order to avoid thermal influence. There is something that cools by introducing running wind.

[0003]

In such a scooter type vehicle, especially when traveling on an unpaved road or the like, an element is provided in the air cleaner or the transmission case so that dust or dust is not sucked into the engine or the transmission case. Is provided to prevent dust and debris from entering the inside of the engine and transmission case, but dust and debris adhere to this element, so it is necessary to frequently remove and clean or replace it.
It's very troublesome.

In order to prevent dust and dirt from entering the inside of the engine and the transmission case, for example, a duct may be extended from the air cleaner or the transmission case so that air is sucked from a place where dust and dirt cannot easily enter. However, there is a problem that the duct is complicated to handle and the air resistance is large.

The present invention has been made in view of the above circumstances, and provides a scooter type vehicle that reduces the complexity of element cleaning and replacement, has a simple structure, and has a low air resistance for suction. Is intended.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention bends a vehicle body frame between a handle and a seat downward so that a foot rest having a low floor is provided between the handle and the seat. In a scooter type vehicle having a unit swing engine below the seat and behind the footrest, a front cover of the body frame is surrounded by a front cover, and a periphery of the body frame below the seat. Is covered with a rear cover, the vehicle body frame between the front cover and the rear cover is surrounded by a footrest cover, and the front cover and the footrest cover cover the front cover with a substantially closed communication with the outside. A space is formed, and the rear portion of the substantially closed space and the transmission case of the unit swing engine and / or the air cleaner of the engine are communicated with each other by an air introduction pipe. It is.

[0007]

In the present invention, the air in the substantially closed space formed by the front cover and the footrest cover is sucked through the air introduction pipe and introduced into the transmission case and / or the air cleaner of the unit swing engine.

[0008]

Embodiments of the scooter type vehicle of the present invention will now be described in detail with reference to the accompanying drawings. 1 to 9 show a first embodiment of a scooter type vehicle according to the present invention.
4 is a side view of the scooter type vehicle, FIG. 2 is a plan view of the scooter type vehicle, FIG. 3 is a sectional view of the unit swing engine, and FIG.
1 is a sectional view taken along the line IV-IV in FIG. 1, FIG. 5 is a plan view showing the mounting state of the air introduction box, FIG. 6 is a sectional view taken along the line VI-VI in FIG. 5, and FIG.
VII-VII sectional view, FIG. 8 is a VIII-VIII sectional view of FIG. 5, and FIG.
6 is a sectional view taken along line IX-IX in FIG.

In the figure, reference numeral 1 is a scooter type vehicle, and a vehicle body frame 2 of the scooter type vehicle 1 includes a head pipe 3 and
A main frame 4 that extends downward and rearward from the lower portion of the head pipe 3 and further extends rearward, and a pair of left and right rear frames that extend rearwardly from both sides of the rear portion of the main frame 4 and bend, rise, and obliquely upward and rearward. It is composed of 5. A steering shaft 6 is rotatably provided on the head pipe 3, a front fork 7 is attached to a lower portion of the steering shaft 6, a front wheel 8 is supported on a lower portion of the front fork 7, and an upper portion of the steering shaft 6 is provided. A handle 9 is provided, and the handle 9 is covered with a handle cover 10.

A main frame 4 is provided below the head pipe 3.
The front portions of the rear frames 5 are welded to the rear portion of the main frame 4, and the front portions of the pair of left and right rear frames 5 are welded to the rear portion of the main frame 4. Engine mounting brackets 11 are welded to the front sides of the pair of left and right rear frames 5, respectively.
The engine mounting bracket 12 is welded to the rear side. The front side of the unit swing engine 13 is pivotally supported by the front engine mounting bracket 11 via a link 800, and the rear side of the unit swing engine 13 is mounted on the rear engine mounting bracket 12 by the rear cushion 14.
It is supported via and can swing up and down.

The unit swing engine 13 comprises a forced air-cooled two-cycle single-cylinder engine 15 and a transmission case 17 having a power transmission mechanism 16 therein. A crankshaft 19 is rotatably supported by a crankcase 18 of the engine 15, and a piston 21 is connected to the crankshaft 19 via a connecting rod 20. A generator 22 is provided at the right end of the horizontal crankshaft 19.
Is attached, and a fan 23 is fixed to the generator 22. The fan 23 takes in outside air from a cooling air intake 25 provided in the engine cover 24 into the engine cover 24 to forcibly cool the engine 15.

An intake pipe 26 is connected to the engine 15,
A carburetor 27 is connected to the intake pipe 26, and an air cleaner 28 is connected to the carburetor 27. The engine 15 is connected to the front side of the transmission case 17, and the air cleaner 28 is provided on the left side of the cylinder 801 of the engine 15.
Are arranged. An exhaust pipe 29 is connected to the engine 15, and a muffler 30 is connected to the exhaust pipe 29.

Transmission case 1 integrated with engine 15
Reference numeral 7 denotes an inner case 36 integrally formed from the left side surface of the crankcase 18 and extending rearward, and an outer case 38 attached to the inner case 36 with bolts 37. An axle 40 of a rear wheel 39 is axially supported by the inner case 36, and the rotational force of the engine 15 is transmitted to the axle 40 via the power transmission mechanism 16. The drive pulley 42 of the V-belt automatic transmission 41 that constitutes the power transmission mechanism 16 is attached to the left end of the crankshaft 19. The drive pulley 42 is a movable pulley half 42a that slides on the crankshaft 19, and a fixed pulley half 42 that is fixed to the end of the crankshaft 19 so as to face the movable pulley half 42a.
and b. The movable pulley half 42a is a weight 4
Fixed pulley half 4 with pressing force according to the rotation speed by 3
The belt winding radius of the V-belt 44, which is pressed to the 2b side and is wound between the movable pulley half body 42a and the fixed pulley half body 42b, changes with an increase or decrease in the rotation speed.

The rotational force of the drive pulley 42 is the V-belt 4
4, driven pulley 45, centrifugal clutch 46, driven shaft 47,
It is transmitted to the axle 40 of the rear wheel 39 via the reduction gear mechanism 48. The pulley half 45a of the driven pulley 45 is a support cylinder 49.
The pulley half 45b is fixed to the support cylinder 49 so as to be movable in the axial direction.
The driven pulley 45 is urged in the direction of 5a to change the belt winding radius of the driven pulley 45. The support cylinder 49 is the driven shaft 4
7, the centrifugal clutch 46 transmits the rotation of the driven pulley 45 to the driven shaft 47.

A soundproof cover 50 is attached to the outer case 38 with bolts 51. The soundproof cover 50 has a shape conforming to the outer surface shape of the outer case 38, and the soundproof cover 50 is the entire outer surface of the outer case 38. To prevent the vibration sound generated by the vibration of the outer case 38 itself from leaking to the outside of the vehicle. The soundproof cover 50 is made of synthetic resin, and cushioning materials 501, 502, 503, 504 are provided between the soundproof cover 50 and the outer case 38.
Is provided.

An air passage 52 is formed between the outer case 38 and the soundproof cover 50 by cushioning materials 501 and 502, and air is guided from the air passage 52 to an air suction portion 53 formed in the outer case 38, and the air suction is performed. It can be introduced from the portion 53 into the transmission case 17. The air suction portion 53 has a window portion 54 formed in the outer case 38 at a position facing the drive pulley 42 of the V-belt automatic transmission 41,
It is composed of an element 55 that covers the window portion 54 and a cap 56 having a hole that holds the element 55, and air is introduced into the interior through the window portion 54 through the element 55. A fan 42c is integrally formed with the fixed pulley half 42b of the drive pulley 42, and air is sucked by the rotation of the fan 42c, cools the V-belt automatic transmission 41, and then is discharged from a discharge port (not shown). . In this way, air can be introduced into the transmission case 17 and heat can be prevented from being trapped inside the transmission case 17.

A helmet storage box 59 and a fuel tank 60 are arranged above the unit swing engine 13, and a seat 61 is arranged so as to cover the opening of the helmet storage box 59. Below the seat 61, a rear frame is arranged. The periphery of 5 is covered with a rear cover 62.

The front side peripheries of the head pipe 3 and the main frame 4 are surrounded by a front side cover 63. The front cover 63 is composed of a front cover 64, a leg shield 65 and an under cover 66. The inside of the front cover 63 is formed by an opening 67 formed above the front cover 64 and a gap 68 between the front cover 63 and the steering shaft 6. Communicates with the outside. The front cover 63 is supported by the head pipe 3 and the main frame 4 via brackets 69, 70, 71, 72.

A foot board 74 is provided so as to be connected to the leg shield 65, and an under cowl 75 is provided so as to be connected to the front cover 64 and the under cover 66. The foot board 73 is composed of the foot board 74 and the under cowl 75. . The front side of the main frame 4 and the pair of left and right rear frames 5 between the front cover 63 and the rear cover 62 are surrounded by a footrest cover 73, and the front cover 63 and the footrest cover 73 are continuous along the vehicle body frame. The space 700 is formed. This space 70
No. 0 is open on the rear surface side of the footrest cover 73, but an air insertion box 80 to be described later is provided so as to close the opening 700a.
Is provided, whereby a substantially closed space A is provided.

The footboard 74 has a mesh-like reinforcing rib 7
4a is formed. The foot board 74 is positioned so as to cover the upper front side of the main frame 4 and the pair of left and right rear frames 5, and a front foot board mounting bracket 76 welded to the connection portion between the main frame 4 and the pair of left and right rear frames 5. The rear footboard mounting bracket 77 welded between the pair of left and right rear frames 5 is mounted with screws 78 and 79, respectively. The under cowl 75 faces the footboard 74 and the main frame 4
The under cowl 75 is attached so as to engage with the foot board 74 so as to cover the lower front sides of the pair of left and right rear frames 5.

An air introducing box 80 is disposed inside the footrest cover 73, the air introducing box 80 is open at the upper side and the front side, and a rear wall 80a has a notch 80g through which the rear frame 5 is inserted. Are formed. A seal member 81 is provided between the rear frame 5 and the cutout 80g. An attachment portion 80b formed on the rear wall 80a is fastened and fixed to a stay 82 of the rear frame 5 with a bolt 83 and a nut 84. Upper peripheral part 8 of air introduction box 80
A seal material 85 is sandwiched between 0c and the footboard 74. A mounting portion 80d is provided on the front side of the air introduction box 80.
Is formed so as to project upward, and this mounting portion 80d is fastened and fixed to the front footboard mounting bracket 76 with screws 86. By utilizing the gap between the air introduction box 80 and the under cowl 75 of the footrest cover 73, the brake wire 87, the throttle wire 88, the oil pump wire 8
9 and the wire harness 90 are arranged.

The air introducing box 80 is attached to the main frame 4 and the pair of left and right rear frames 5, and a brake wire 87, a throttle wire 88, an oil pump wire 89 and a wire harness 90 are arranged below the air introducing box 80. The foot board 74 and the under cowl 75 are attached in this state. In this way, the front cover 6
The rear end portion of the space formed by 3 and the footrest cover 73 is provided with an air introduction box 80, a brake wire 87, a throttle wire 88, an oil pump wire 89, and a wire harness 90.
Is closed to form a closed space, the closed space can be easily formed without using a special member, and the assembling work is easy.

An air introducing pipe 91 is connected to a central position of a rear wall 80a of the air introducing box 80, and the air introducing pipe 91 is connected to the air introducing pipe 91.
Is connected to the air cleaner 28 of the unit swing engine 13, and the air in the substantially closed space A formed by the front cover 63 and the footrest cover 73 is supplied to the air cleaner 28 via the air introduction pipe 91, and the air from the air cleaner 28 is carburetor 27. Is supplied to. Although an element is provided in the air cleaner 28, this element may not be provided because the air in which the dust and the dust in the substantially closed space A are reduced is supplied to the carburetor 27.

An air introduction pipe 92 is connected to the rear wall 80a of the air introduction box 80 at a position outside the left rear frame 5, and the air introduction pipe 92 extends rearward along the rear frame 5 to form a unit. The swing engine 13 is bent at an upper position on the front side of the transmission case 17 and extends downward to communicate with the air passage 52 of the transmission case 17. Air is transmitted from the air passage 52 through the air suction portion 53.
Although the air is introduced into the air passage 7, the air in which the dust and the dust in the substantially closed space A are reduced is introduced into the air passage 52, and thus the element 55 of the air suction portion 53 may not be provided.

The traveling wind is introduced from the upper part of the front cover 63 into the substantially closed space A defined by the front cover 63 and the footrest cover 73, and the air introduction box 80 arranged in the footrest cover 73 in the substantially closed space A. The air from which dust and dirt have been reduced from the unit swing engine 13 through the air introduction pipe 91.
Is introduced into the air cleaner 28 of the
Transmission case 1 of the unit swing engine 13 via
7 is introduced into the air passage 52. In this way, the air is introduced into the front cover 63 on the front side of the scooter type vehicle 1 and from a position higher than the road surface, so air with less dust and dust is introduced, and the elements of the transmission case 17 and the air cleaner 28 are less contaminated. The frequency of element cleaning and replacement is reduced.

Next, a second embodiment of the scooter type vehicle of the present invention will be described. 10 is a side view of the scooter type vehicle, and FIG. 11 is a plan view of the scooter type vehicle.

In this scooter type vehicle 1, the parts having the same reference numerals as those in the first embodiment have the same structure, and the description thereof will be omitted. In the second embodiment, an air introducing box 80 is arranged inside the footrest cover 73, and an air introducing port 100 is provided in the left rear frame 5 at a position inside the air introducing box 80. Inlet part 100
The running wind flows through the rear frame 5. At the rear position of the rear frame 5, the air outlet 1
01 is provided, and the air discharge port 101 and the air passage 52 of the transmission case 17 of the unit swing engine 13 are connected by a pipe 102. Therefore, the traveling wind is guided to the air introduction box 80 arranged in the footrest cover 73,
Traveling wind is introduced from the air introduction box 80 into the air passage 52 of the transmission case 17 through the rear frame 5 and the air introduction pipe 92 including the pipe 102. in this way,
The rear frame 5 is used to configure the air introduction pipe 92, and the structure is simple because no special pipe is used.

[0028]

As described above, according to the present invention, the front cover and the footrest cover form a substantially closed space communicating with the outside at the upper part of the front cover, and the rear part of the substantially closed space and the unit swing engine. Since the transmission case and / or the air cleaner of the engine are communicated with each other by the air introduction pipe, the air in the substantially closed space formed by the front cover and the footrest cover is sucked through the air introduction pipe, and the transmission case of the unit swing engine. Since it is introduced into the air cleaner and / or the element, it is possible to reduce the complexity of cleaning and replacement of the element, and the simple structure is suitable for the scooter type vehicle with less air resistance of suction.

[Brief description of drawings]

FIG. 1 is a side view of a scooter type vehicle.

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

FIG. 3 is a sectional view of a unit swing engine.

FIG. 4 is a sectional view taken along the line IV-IV in FIG.

FIG. 5 is a plan view showing a mounting state of an air introduction box.

6 is a sectional view taken along line VI-VI in FIG.

7 is a sectional view taken along line VII-VII of FIG.

8 is a sectional view taken along line VIII-VIII of FIG.

9 is a sectional view taken along line IX-IX in FIG.

FIG. 10 is a side view of the scooter type vehicle.

FIG. 11 is a side view of a scooter type vehicle equipped with a unit swing engine.

[Explanation of symbols]

 1 Scooter type vehicle 2 Front frame 7 Front fork 8 Front wheel 13 Unit swing engine 15 Engine 17 Transmission case 28 Air cleaner 39 Rear wheel 61 Seat 62 Rear cover 63 Front cover 73 Footrest cover 74 Hood board 80 Air introduction box 91, 92 Air introduction piping 700 Space A Nearly closed space

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Yasushi Maeda 2500 Shinkai, Iwata, Shizuoka Prefecture Yamaha Motor Co., Ltd.

Claims (1)

[Claims] 1. A body frame between a handle and a seat is bent downward, and a foot rest having a low floor is provided between the handle and the seat, and the foot rest is below the seat and behind the foot rest. In a scooter type vehicle in which a unit swing engine is disposed in the vehicle body, a front cover of the body frame is surrounded by a front cover, and a body cover below the seat is covered by a rear cover, and the front cover and the rear cover are provided. The body frame between them is surrounded by a footrest cover, and the front cover and the footrest cover form a substantially closed space communicating with the outside at the upper part of the front cover, and the rear part of the substantially closed space and the unit swing. A scooter type vehicle characterized in that the transmission case of the engine and / or the air cleaner of the engine are communicated with each other through an air introduction pipe.