JPH06117338A - Air cleaner of cooter type vehicle - Google Patents

Abstract

PURPOSE:To provide an air cleaner of a scooter type vehicle capable of heightening air suction efficiency of an engine, improving cleanup efficiency of the air cleaner and exhaust efficiency of an exhaust muffler by way of increasing internal capacity of the air cleaner and the exhaust muffler, simultaneously preventing the air cleaner from sucking a foreign substance and cutting cost. CONSTITUTION:An engine 14 and a motive power transmission device 15 are constituted as one power unit 13, and on a scooter type vehicle 1 w rear wheel 16 of which is axially supported by this power unit 13, an air cleaner 20 of the aforementioned engine 14 is arranged above the aforementioned rear wheel 16, and on a bottom part of this air cleaner 20, a fender part 21 to cover an upper part of the rear wheel 16 is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air cleaner for a scooter type vehicle for purifying intake air of an engine.

[0002]

2. Description of the Related Art In a general scooter type vehicle, as shown in FIG. 6, an engine 100 and a power transmission device 101 using a V-belt are constructed as one power unit 102. Ring 103
Is rotatably supported and the power of the engine 100 is transmitted to the power transmission device 10
1 is transmitted to the rear wheel 103.

A carburetor 10 is provided above the engine 100.
4 is installed, and an air cleaner 106 is connected to the carburetor 104 via an intake pipe 105. Conventionally, the air cleaner 106 has the power transmission device 1 sandwiching the rear wheel 103.
The exhaust muffler 107 arranged on the opposite side of 01 and connected to the engine 100 extends below the air cleaner 106 and extends rearward.

A fender (not shown) is fixed to the vehicle body side above the rear wheel 103 so that water, mud, etc., which the rear wheel 103 winds up, does not splash on the engine 100, the carburetor 104, or the like.

[0005]

However, when the air cleaner 106 is installed on the side of the rear wheel 103 in this way, a straight intake passage cannot be obtained because the intake pipe 105 has a strongly curved shape. However, there is a concern that the intake efficiency may deteriorate and the performance of the engine 100 may not be sufficiently exhibited.

Further, the air cleaner 106 and the exhaust muffler 1
07 are arranged vertically close to each other, so that both members 10
In order to prevent the interference of 6, 107, it is necessary to limit the size of both members 106, 107, that is, the internal capacity, and the purification efficiency of the air cleaner 106 and the exhaust efficiency of the exhaust muffler 107 are often sacrificed.

Moreover, since the heat of the exhaust muffler 107 is easily transferred to the upper air cleaner 106, it is necessary to provide a heat shield plate or the like on the upper surface of the exhaust muffler 107 in order to prevent heat damage, resulting in an increase in cost.

Further, the intake port 10 of the air cleaner 106
Since 8 is opened to the side of the vehicle body, foreign matters such as water, mud, and dust splashed by the front and rear wheels during traveling of the scooter type vehicle are highly likely to be sucked into the intake port 108, and the air filter Was easy to get dirty.

The present invention has been made in order to solve these problems, and enhances the intake efficiency of the engine and expands the internal capacity of the air cleaner and the exhaust muffler so that the purification efficiency of the air cleaner and the exhaust efficiency of the exhaust muffler can be increased. It is an object of the present invention to provide an air cleaner for a scooter type vehicle capable of improving the above-mentioned characteristics, preventing foreign matter from being sucked into the air cleaner at the same time, and simultaneously achieving cost reduction.

[0010]

In order to achieve the above object, an air cleaner for a scooter type vehicle according to the present invention comprises an engine and a power transmission device as one power unit, and a rear wheel is pivotally supported by the power unit. Also, in the scooter type vehicle, the air cleaner of the engine is arranged above the rear wheel, and a fender portion that covers the upper portion of the rear wheel is provided at the bottom of the air cleaner.

[0011]

When the air cleaner of the scooter type vehicle is constructed as described above, the air cleaner is arranged immediately after the carburetor, so that the intake pipe connecting the air cleaner and the carburetor can be formed in a straight tube shape to form a straight intake passage. It will be possible. Therefore, the intake efficiency of the engine is improved.

Further, since the air cleaner and the exhaust muffler do not come close to each other, the respective sizes can be increased to increase the internal capacity, and the purification efficiency and intake efficiency of the air cleaner and the exhaust efficiency of the exhaust muffler are improved.

Moreover, the intake port of the air cleaner can be located above the rear wheel, and it becomes difficult for foreign matter to be sucked into the air cleaner.

Furthermore, since the heat of the exhaust muffler does not reach the air cleaner, it is not necessary to provide a heat insulating device for the air cleaner, which results in cost reduction.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a left side view of a scooter type vehicle showing an embodiment of the present invention. A vehicle body frame 2 of the scooter type vehicle 1 is of a general underbone type, and a front fork 4 supporting a front wheel 3 is pivotally attached to a front head of the scooter type vehicle 1 together with a handle bar 5 so as to be rotatable left and right. Further, an article storage body 7 capable of storing the helmet 6 and the like is formed in the rear portion of the vehicle body frame 2 by a steel plate monocoque structure or the like, and a seating seat 8 is openably and closably installed thereon.

The vehicle body frame 2 is entirely covered with a frame cover 9 made of synthetic resin, and a floor step 10 is formed between the handlebar 5 and the seat 8 and extends deeply downward. ing.

At the lower center of the body frame 2, the link 1
The power unit 13 is connected via 2 to be rotatable in the vertical direction. This power unit 13, which is generally used for a scooter type vehicle, is shown in FIG.
As shown in FIG. 3, the engine 14 and the power transmission device 15 are integrated into one, and the rear wheel 16 is directly pivotally supported on the rear portion of the power transmission device 15. A shock absorber 17 is connected between the rear portion of the power transmission device 15 and the rear portion of the vehicle body frame 2.

Therefore, when the scooter type vehicle 1 is running, the rear wheel 16 is caused by the unevenness of the road surface and the power unit 13
Together with this, it swings in the vertical direction, and the shock is buffered by the shock absorber 17.

A carburetor 19 is installed above the engine 14, and an air cleaner 20 is connected to the intake side (rear side) of the carburetor 19. This air cleaner 2
0 is a shape that is arranged above the rear wheel 16 and extends in the front-rear direction, and the bottom portion thereof is curved in accordance with the contour of the rear wheel 16,
A fender portion 21 that covers the upper portion of the rear wheel 16 is provided in this portion by integral molding or the like. The engine 1
The exhaust muffler 22 connected to the lower portion of the vehicle 4 is curved, passes through the right side of the rear wheel 16, and extends rearward.

As shown in FIGS. 4 and 5, the air cleaner 2
0 is a cleaner case body 2 in which the fender portion 21 and an intake pipe 23 fitted into the carburetor 19 are formed.
4, a cleaner case lid 25 that can airtightly close the upper opening of the cleaner case body 24, and an air filter 26 that is fitted into the cleaner case lid 25.

In this embodiment, the cleaner case body 2
The length and width of the fender portion 21 provided on the No. 4 are configured to protrude from the bottom surface of the cleaner case body 24, and a mounting bracket 27 is formed on the right side portion of the fender portion 21, for example. The bracket 27 is fixed to a stay 28 or the like provided on the exhaust muffler 22 with bolts 29 or the like. In addition,
A plurality of ribs 31 that support the cleaner element 26 from below are formed inside the cleaner case body 24.

The cleaner case lid portion 25 is provided with an intake port 32 opening rearward, and the outside air sucked from the intake port 32 passes through the air filter 26 made of a porous material such as sponge. At that time, dust or the like is separated and purified, and is supplied to the carburetor 19 through the intake pipe 23.

In the case of the above construction, since the air cleaner 20 is arranged immediately after the carburetor 19, the intake pipe 23 can be formed in a straight tube shape to obtain a straight intake passage, and the intake efficiency is improved to improve the engine 14 The performance of can be fully exhibited.

Further, the air cleaner 20 and the exhaust muffler 22
Since and will not be close to each other, the size of both members 20, 22,
That is, the internal capacity can be expanded more than ever before.

When the internal capacity of the air cleaner 20 is enlarged, the area of the air filter 26 can be increased, so that the purification efficiency is improved and the intake resistance is reduced, which is combined with the straight intake passage effect. The intake efficiency can be further improved.

Further, when the internal volume of the exhaust muffler 22 is expanded, the expansion chamber expands, so that the expansion action and reflection action of the exhaust gas can be enhanced, and the exhaust efficiency and the muffling efficiency can be improved.

Further, the air cleaner 20 and the exhaust muffler 2
It is not necessary to take measures to protect the air cleaner 20 from the heat of the exhaust muffler 22 in order to sufficiently separate the air cleaner 20 and the air cleaner 20, and to abolish the fender which is conventionally provided above the rear wheel 16 independently. Therefore, it is possible to significantly reduce the cost.

Moreover, since the air intake port 32 of the air cleaner 20 can be located considerably above the rear wheel 16, foreign matter such as water, mud, and dust is unlikely to be sucked into the air intake port 32, and the air filter 26 is less likely to become dirty. be able to.

[0030]

As described above, the air cleaner for a scooter type vehicle according to the present invention is a scooter type vehicle in which an engine and a power transmission device are configured as one power unit, and the rear wheels are axially supported by the power unit. ,
An air cleaner of the engine is arranged above the rear wheel, and a fender portion for covering an upper portion of the rear wheel is provided at a bottom portion of the air cleaner.

Therefore, since the air cleaner is arranged immediately after the carburetor, the intake pipe connecting the air cleaner and the carburetor is formed into a straight tube to form a straight intake passage, and the intake efficiency of the engine can be improved.

Further, since the air cleaner and the exhaust muffler do not come close to each other, it is possible to enlarge the air cleaner and the exhaust muffler to increase the internal capacity, and improve the cleaning efficiency of the air cleaner, the intake efficiency and the exhaust efficiency of the exhaust muffler. It is possible to

Moreover, the intake port of the air cleaner can be installed above the rear wheel, and foreign matter such as water, mud and dust can be prevented from being sucked into the air filter.

Further, since the air cleaner and the exhaust muffler are sufficiently separated from each other and the heat of the exhaust muffler does not reach the air cleaner, it is not necessary to take measures to protect the air cleaner from heat, and the cost can be reduced.

[Brief description of drawings]

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

FIG. 2 is a left side view of a power unit, a rear wheel, a carburetor, an air cleaner and the like.

FIG. 3 is a plan view corresponding to FIG.

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

5 is a cross-sectional view of the air cleaner taken along the line VV of FIG.

FIG. 6 is a plan view of a power unit, a rear wheel, a carburetor, an air cleaner, an exhaust muffler and the like showing a conventional technique.

[Explanation of reference numerals] 1 scooter type vehicle 13 power unit 14 engine 15 power transmission device 16 rear wheel 20 air cleaner 21 fender portion

Claims (1)

[Claims] 1. In a scooter type vehicle in which an engine and a power transmission device are configured as one power unit, and the rear wheel is pivotally supported by the power unit, an air cleaner of the engine is arranged above the rear wheel, and the air cleaner is disposed above the rear wheel. An air cleaner for a scooter type vehicle, characterized in that a fender portion that covers the upper portion of the rear wheel is provided at the bottom of the vehicle.