JPH08318887A - Scooter type motor-bicycle - Google Patents

Abstract

PURPOSE: To prevent the invasion of a dust and a muddy water, and to make the setting reasonable, by providing a V-belt air cleaner for cooling from the outer side front side of an air cleaner for engine, up to a projection at the outer side of the rear part of a transmission case, and arranging both outer air suction ports in a body cover. CONSTITUTION: A V-belt air cleaner device for cooling to lead the outer air to a blower hole 15, which is formed of a V-belt air cleaner 17A for cooling, and a rubber pipe 18, is provided from the front side of the outer side of an air cleaner 17 for engine, up to the front side of a projection 9a formed at the outer side of the rear part of a transmission case 9, and both outer air suction ports 17c of both air cleaners 17 and 17A are provided in a body cover. Since both the air cleaners 17 and 17A suck the outer air from the inside of the body cover, the dust and the muddy water are made difficult to enter the air cleaners 17 and 17A. And since the air cleaner 17 for engine has the suction port 17c positioning to the outer side, the dust and the muddy water are made difficult to enter, even though its position is near the rear wheel.

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 in which a V-belt type automatic transmission is housed in a so-called unit swing type power unit.

[0002]

BACKGROUND OF THE INVENTION In a scooter type motorcycle, a V-belt type automatic transmission is housed in a transmission case extending from one side of the engine to the rear side, and a V-belt type automatic transmission is provided inside a rear portion of the transmission case.
The rear wheel is held, and these are integrated to form a power unit, and this power unit is arranged below the operation seat so as to be able to swing up and down at the front part, and it is a unit swing type Is known.

In this case, the V-belt type automatic transmission is housed in a transmission case. Further, this transmission constantly generates heat due to friction between the running belt and the pulley. For this reason, there arises a problem that the temperature inside the case rises, the belt of the transmission is deteriorated, and its durability is reduced.

Therefore, outside air is introduced into the transmission case to
It is conceivable to cool a belt or the like. In this case, if dust or muddy water that winds up the rear wheel enters the transmission case, the durability of the V-belt decreases. Therefore, it is conceivable to provide an air cleaner device for cooling the V-belt. However, it is necessary to make it difficult to inhale dust and muddy water and to enable a rational arrangement in consideration of the arrangement of other devices.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and is a unit swing type in which a power unit having a transmission case for accommodating a V-belt type automatic transmission is vertically swingably suspended. In addition, it is possible to guide the cooling air into the transmission case to cool the transmission, prevent dust and muddy water from entering with the cooling air, and improve the durability of the transmission. An object of the present invention is to provide a scooter type motorcycle in which an air cleaner device for cooling V-belt for guiding cooling air can be rationally arranged.

[0006]

According to the present invention, an object of the present invention is to hold one rear wheel inside a rear portion of a transmission case extending from one side of an engine to a rear side and to accommodate a V-belt type automatic transmission in the transmission case. In the scooter-type motorcycle, the power unit is disposed below the driver's seat so that it can swing up and down at its front part, and is covered with a vehicle body cover from below the driver's seat to the upper periphery of the power unit. An engine air cleaner disposed above the case and laterally of the rear wheel, the outer surface of which is substantially at the same position as the outer surface of a protrusion formed outside the rear portion of the transmission case, and a front portion inside the transmission case. And a blower opening provided on the outer side surface of the drive pulley of the V-belt automatic transmission, and a blower opening facing the center of the blower blade and opening to the front outer side surface of the transmission case. A V-belt cooling air cleaner device that guides outside air, and the V-belt cooling air cleaner device is disposed from the outside front of the engine air cleaner to the front of a protrusion formed outside the rear portion of the transmission case. The scooter-type motorcycle is also characterized in that both the outside air suction port of the V-belt cooling air cleaner device is located inside the vehicle body cover.

In the engine air cleaner, it is desirable to connect an intake pipe for guiding intake air to the engine so as to extend forward from the inside in the vehicle width direction at a front portion thereof. It is preferable that both the engine air cleaner and the V-belt cooling air cleaner device are divided into right and left parts, and a plate-shaped filter extending vertically and in the front-rear direction is sandwiched between the divided surfaces of these cases.

[0008]

1 is a side view showing a main portion of a scooter type motorcycle to which the present invention is applied, FIG. 2 is a plan view showing a power unit partially cut away, and FIG. 3 is a side view showing a part broken away. FIG. 4 is a cross-sectional view of the vicinity of the drive pulley taken along a plane including the center of the crankshaft, and FIG. 5 is a cross-sectional view taken along a horizontal plane of the air cleaner.

In these figures, reference numeral 1 denotes a body frame of a scooter. The body frame 1 includes a front member 1b made of a steel pipe that extends downward from a steering pipe 1a and then bends horizontally rearward, and a front member 1b. A rear member 1c extending obliquely rearward and upward from a rear portion of the member 1b and a steel plate bracket 1d for strengthening a connecting portion thereof are welded and assembled together. Reference numeral 2 denotes a fuel tank attached to the rear member 1c of the body frame 1, and 3 denotes a storage battery, which are covered by a body cover 4. Reference numeral 5 denotes an occupant's operation seat.

The lower part of the rear of the vehicle body frame 1, that is, the driving seat 5
A power unit 6 is mounted below. The power unit 6 is a so-called unit swing type, which has a rear wheel 7 at a rear end and is rotatably supported by the vehicle body frame 1 by a front pivot shaft 6a. This power unit 6
Has an engine 8, a transmission case 9 extending from the left side of the crankcase of the engine 8 to the rear, and a rear wheel 7 held inside a rear portion of the transmission case 9.

In the transmission case 9, a V-belt automatic transmission 6 is provided.
b is accommodated. A drive pulley 11 is provided in the front of the case 9, and a driven pulley 1 is provided in the rear of the transmission case 9.
2 are accommodated, and a V-belt 13 is wound between them. That is, a fixed plate 11a is fixed to a shaft end of the crankshaft 8a extending into the transmission case 9 by a nut, and a movable plate 11b is attached by a spline so as to be movable in the axial direction. And are formed so as to be separated from each other, and the configuration thereof is the same as that of a known device.

A projection 9a corresponding to the driven pulley 12 is formed immediately outside the rear portion of the transmission case 9, and a recess 9 is provided in front of the projection 9a so as to be depressed inward in the vehicle width direction in plan view.
b is formed (see FIG. 2).

Reference numeral 15 denotes a blower opening formed on the front outer surface of the transmission case 9 so as to face the center of the fixed plate 11a. Reference numeral 16 denotes a blower blade provided on a side surface of the fixed plate 11a.

Reference numeral 17 denotes an engine air cleaner fixed to the upper surface of the transmission case 9 and disposed along the longitudinal direction, that is, the front-back direction. This engine air cleaner 1
7 is located above the transmission case 9 and to the side of the rear wheel 7,
An outer surface (outer surface) of the vehicle body width direction is located at substantially the same position as an outer surface of the projecting portion 9a of the transmission case 9 (see FIG. 2).

A V-belt cooling air cleaner 17A is provided on the outside front of the engine air cleaner 17 with a partition wall 17A.
a, 17a. That is, the engine air cleaner 17 and the V-belt cooling air cleaner 17
A is integrated. These air cleaners 17, 1
The case forming 7A is divided into right and left, and a single air-permeable plate-like filter 17B made of open cells is sandwiched between split surfaces of the case.

The engine air cleaner 17 includes a partition wall 17.
a, which has a large chamber 17b defined by a, and which opens on the lower surface outside the filter 17B, and an intake outlet 17d which opens forward from inside the vehicle body width direction at the front of the case.
have. The outside air intake port 17c is the recess 9 of the transmission case 9.
When facing the upper side of b, the outside air suction port 17c is directed downward from the front of the projecting portion 9a of the transmission case 9 to the concave portion 9b.
An air intake duct 17C that opens at is attached.

An intake pipe 17D for guiding intake air to the carburetor 25 of the engine 8 is connected to the intake outlet 17d. Therefore, the outside air is sucked from outside the transmission case 9 from the front of the protruding portion 9a through the intake duct 17C and the outside air inlet 17c, enters the large chamber 17d through the filter 17B, and is guided to the intake pipe 17D from the intake outlet 17d. .

The V-belt cooling air cleaner 17A has an outside air intake port 17f for guiding outside air from the front to a small chamber inside the vehicle width direction from the filter 17B, and a discharge port 17g opening downward from the small chamber outside the vehicle width direction. This discharge port 17g
A rubber tube 18 extending downward through the concave portion 9b of the transmission case 9 is connected to the rubber tube 18.
5, that is, it communicates with the blower port 15 facing the blower blade 16.

These V belt cooling air cleaners 17A
The rubber tube 18 and the rubber tube 18 form an air cleaner device for cooling the V-belt that guides the outside air to the blower port 15. Reference numeral 19 denotes an air outlet opening at the rear of the transmission case 9.

Here, the upper portion of the transmission case 9 is located inside the vehicle body cover 4 which covers the rear portion of the vehicle body, as shown in FIG.
An air cleaner 17 located on the upper surface of the transmission case 9;
17A is also located inside the vehicle body cover 4. Both air cleaners 17 and 17A draw in the outside air from inside the vehicle body cover 4. Therefore, dust and muddy water hardly enter the air cleaners 17 and 17A. Further, since the engine air cleaner (17) has the outside air suction port 17c located on the outer side, this air cleaner (17)
Even if it is close to the rear wheel (7), it becomes difficult for dust and muddy water to enter sufficiently.

The large chamber 17b is provided with a second partition S as shown by an imaginary line in FIG. 5, and is connected to the starting intake passage of the carburetor 25 of the engine independently of the main intake passage. However, the filter can be shared. S ₁ is its intake inlet and S ₂ is its outlet.

Reference numeral 21 is a ventilation hole provided in the cover 4, and the outside air is sucked in by the electric fan 22 on the rear surface of the vehicle body cover 4
The purpose is to suppress the temperature rise in the engine room. Of course, on the contrary, the fan may be operated so as to discharge the hot air in the engine room to the outside.

Next, the operation of this embodiment will be described. When the crankshaft 8a rotates, the air in the central portion of the fixed blade 11a is sent in the radial direction by the air blower blades 16 of the fixed tray 11a, and the air is moved from the drive pulley 11 side to the driven pulley 12 inside the transmission case 9.
It flows backward toward the side and cools the inside of the transmission case 9 while reaching the rear exhaust port 19 to prevent overheating thereof. Blower 15
The air introduced from the V-belt cooling air cleaners 17 and 17A has its dust removed.
3 and the pulleys 11 and 12 are not damaged.

Further, this V-belt cooling air cleaner 1
7A is provided integrally with the engine air cleaner 17 through which the intake air of the engine 8 passes, and the filter 17B is also shared, so that the structure is simple and the transmission case 9 is substantially integrally configured to be compact.

[0025]

As described above, according to the first aspect of the present invention, in the transmission case integrated with the power unit accommodating the V-belt type automatic transmission, cooling is performed by the blower blades which rotate integrally with the drive pulley of the transmission. Since the air is guided to cool the inside of the case, the belt of the transmission and the like can be efficiently cooled. In addition, the cooling air guided into the transmission case can remove dust and muddy water contained in the V-belt cooling air cleaner, so that dust and muddy water can be prevented from adhering to the belt and the like, and the durability of the transmission can be reduced. Performance can be improved.

Further, the engine air cleaner (17) and the outside air intake port (17) of the V-belt cooling air cleaner device
Both c and 17f) are open to the inside of the vehicle body cover (4), so that dust and muddy water rolled up by the rear wheel (7) are less likely to be sucked in. For this reason, dirt on the filter (17B) is reduced, and the maintenance frequency can be reduced.

Further, the engine air cleaner (17) is disposed above the transmission case (9), and its outer surface substantially coincides with the outer surface of the projection (9a) of the transmission case (9). The width of (6) does not increase.

An air cleaner for cooling the V-belt is
Since it is arranged in front of the side of the engine air cleaner (17) and in front of the protrusion (9a) of the transmission case (9), it is arranged in front of the engine air cleaner (17) and in front of the protrusion (9a). By effectively utilizing the concave portion (9b), both air cleaners (17, 17A) can be arranged comfortably without interfering with each other. For this reason, a rational arrangement suitable for increasing the capacity becomes possible.

According to a second aspect of the present invention, an intake pipe is provided which extends forward from the inside of the front side of the engine air cleaner (17) in the vehicle width direction and guides intake air to the engine.
This intake pipe can be arranged without difficulty through the inside of the V-belt cooling air cleaner (17A) in the vehicle width direction.

According to a third aspect of the present invention, the case of the engine air cleaner (17) and the case of the V-belt cooling air cleaner (17A) are divided into right and left, and a plate-like filter ( 17B), the filtration area of the filter (17B) can be made sufficiently large by utilizing the space above the transmission case (9), which is long in the front and rear directions, and maintenance can be performed from the outside of the vehicle body. Workability is good because it can be performed.

[Brief description of drawings]

FIG. 1 is a side view showing a main part of a scooter type motorcycle to which the present invention is applied.

FIG. 2 is a plan view in which a part of the power unit is cut away.

FIG. 3 is a side view in which a part thereof is cut away.

FIG. 4 is a cross-sectional view of the vicinity of the drive pulley taken along a plane including the center of the crankshaft.

FIG. 5 is a sectional view of the air cleaner taken along a horizontal plane.

[Explanation of symbols]

1 Body Frame 4 Body Cover 6 Power Unit 6b V Belt Type Automatic Transmission 7 Rear Wheel 8 Engine 9 Transmission Case 9a Projection 9b Recess 11 Drive Pulley 12 Driven Pulley 16 Blower Blade 17 Engine Air Cleaner 17A V Belt Cooling Air Cleaner 17B Filter 17D Intake pipe 17c, 17f Outside air intake port 18 V Rubber pipe which is a part of V belt cooling air cleaner device

Claims (3)

[Claims] 1. A power unit which holds one rear wheel inside a rear portion of a transmission case extending from one side of an engine to a rear side and which houses a V-belt type automatic transmission in the transmission case. In a scooter-type motorcycle which is disposed below the driver's seat so as to be able to swing up and down, and which is covered with a vehicle body cover from below the driver's seat to the upper periphery of the power unit. An engine air cleaner, which is arranged laterally and whose outer surface is located at substantially the same position as the outer surface of a protrusion formed on the rear outer side of the transmission case, and the V-belt automatic transmission located in the front portion of the transmission case. Blower provided on the outer surface of the drive pulley of the machine, and V-belt cooling that guides outside air to a blower opening facing the center of the blower and opening on the outer surface of the front part of the transmission case. And an air cleaner device for cooling the V-belt, the V-belt cooling air cleaner device being disposed from the outside front of the engine air cleaner to the front of a protrusion formed on the outside of the rear portion of the transmission case, and the engine air cleaner and the V-belt cooling air cleaner. A scooter type motorcycle characterized in that the outside air intake port of the device is located inside the vehicle body cover. 2. The scooter type motorcycle according to claim 1, wherein the engine air cleaner is connected to an intake pipe extending forward from an inner side in a vehicle width direction of a front portion thereof to guide intake air to the engine. 3. An air cleaner for an engine and an air cleaner device for cooling a V-belt both have left and right split type cases, and a plate-shaped filter extending vertically and longitudinally is sandwiched between split surfaces of these cases. Item 1 or 2
Scooter type motorcycle.