JP2553016B2 - Intake system device for saddle type vehicles such as motorcycles and tricycles - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake system device provided in a saddle type vehicle such as a motorcycle or a motorcycle.

[0002]

2. Description of the Related Art Generally, an air purifier for a motorcycle is usually installed in a narrow space below a seat rail. For this reason, not only the capacity of the air purifier becomes small and the output of the engine is restricted, but there is also a problem that maintenance work such as replacement and cleaning of the filter element is considerably troublesome.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to increase the capacity of an air purifier as much as possible to improve engine output and to facilitate maintenance work such as replacement of a filtering element. An object is to provide an intake system device for a straddle-type vehicle such as a tricycle.

[0004]

In the intake system device of the present invention which achieves the above object, an air purifier is arranged above a pair of left and right main frames extending rearward from a head pipe, and a cylinder is provided below the main frames. In a saddle-ride type vehicle such as a motorcycle or a tricycle equipped with an engine that is erected above the front part of the vehicle, the pair of left and right main frames is tilted downward from the head pipe toward the rear and the left and right spaces are widened. The left side of the air purifier has a width in the left-right direction substantially equal to the left- right spacing of the pair of left and right main frames.
Widely formed to widen the space on the right , and side view
The shape is such that the upper surface is substantially horizontal and the lower surface is the head pipe side.
From the bottom that protrudes downward so that the width becomes wider toward the rear.
The air purifier is provided with an opening for introducing air in the front portion of the air purifier, and the opening for introducing air is provided in a space surrounded by the head pipe and the pair of left and right main frames. While arranging , in the wide part of the air purifier
Inside the filter element and below the filter element
The lower convex portion is disposed on the side, and at the rear of the air purifier,
Connecting an intake passage communicating with the cylinder through a carburetor ,
The connecting portion of the intake passage is connected to the filter element in the air purifier.
To the rear side of the
In addition to being arranged above the lower convex portion, the intake passage
A connecting part is arranged so as to substantially follow the filtering surface of the filtering element, and the vaporizer is arranged behind the cylinder.
On the other hand, by installing the air purifier just above the cylinder,
The intake passage extending from the rear of the carburetor to the carburetor,
Install an air purifier, intake passage, and carburetor above the cylinder.
It is characterized in that it is arranged to wrap around to the rear side .

In this way, the left and right width of the air purifier is
Widen the left and right spacing approximately the same as the left and right spacing of the pair of main frames
To be wide, and the top and bottom widths should be wide toward the rear.
The space between the pair of left and right main frames
Is effectively utilized to have a high volume , thereby increasing the capacity and thereby improving the engine output. In addition, by arranging the air introduction opening provided in the front part of the air purifier in the space surrounded by the head pipe and the pair of left and right main frames, it is included in the traveling wind from the front and the wind from both the left and right sides. Dust, water, and other foreign matter are less likely to be sucked in, and premature clogging of the filter element is prevented.
Further, since the intake passage connecting portion having the opening is arranged along the filtration surface of the filtration element, the engine negative pressure is not locally applied to the filtration surface of the filtration element, and thus the local pollution is prevented. I have to. Therefore,
Due to the synergistic effect on these filter elements, the frequency of replacement of the filter elements can be reduced and maintenance work can be facilitated. In addition, the lower surface of the air purifier is convex downward
Is formed so as to have a portion, and is located above the downward convex portion.
Since it is configured to position the opening of the intake passage,
Even if water enters the purifier, the water will not be guided to the downward projection.
To prevent entry from the opening of the intake passage to the engine side.
Can be

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a three-wheeled motor vehicle equipped with the intake system device of the present invention. In this motorcycle, 1 is a head pipe, 2 is a main frame that extends rearward from the head pipe 1 left and right, and 3 is a down tube that also extends downward one left and right. One front wheel 10 is provided in the center of the vehicle width in the front of the vehicle body, and one rear wheel 11 is provided on the left and right in the rear.

The pair of left and right main frames 2 is a head pipe 1.
It is configured to incline downward as it goes rearward from and to widen the left and right intervals. An engine 4 is mounted in a space surrounded by the main frame 2 and the down tube 3, and an air purifier 8 whose details will be described later is provided above the main frame 2. A seat 6 is provided on the seat rail 5 extending rearward from the main frame 2 so as to be adjacent to the air cleaner 8, and a fuel tank 7 is provided below the seat rail 5.

As shown in FIGS. 2 to 4, the air purifier 8
The outer shell is formed by a case 15 made of resin.
The case 15 extends from the head pipe 1 to the front end of the seat 6 in the front-rear direction, and widens the left-right interval in which the left and right side surfaces are substantially along the pair of left and right main frames 2 in the width direction .
It is designed to be wide . Case 15 side
As for the shape in plan view, the upper surface is almost horizontal and the lower surface is on the head pipe side.
From the bottom that protrudes downward so that the width becomes wider toward the rear.
It is formed so as to have a convex portion 15a . Thus air purifier 8, in plan view, the head pipe 1, when it is formed in a space filled surrounded by the main frame 2 co
In the side view, widen the top and bottom toward the rear.
It has a large capacity by being formed .

The intake passage 13 is connected to the rear of the case 15. The intake passage 13 utilizes the space above the crankcase of the engine 4, extends obliquely downward to the rear, then bends and inverts, and then advances obliquely forward to be connected to the cylinder 4a via the carburetor 9. Has been done. The carburetor 9 is arranged behind the cylinder 4a.
On the other hand, the case 15 of the air purifier 8 is installed directly above the cylinder 4a.
It is designed to be kicked. Extending from the back of the case 15
The intake passage 13 extending to the carburetor 9, and the air purifier 8,
Install the intake passage 13 and the carburetor 9 from above the cylinder 4a.
It is arranged to wrap around the rear side. The case 15 is fixed by a bolt 19 to a bracket 18 whose front end side is fixed between the main frames 2 and 2, and the left and right of the rear end side are fixed between the horizontal pipe 20 and the main frame 2 by a bracket 21, It is fixed to 21 with bolts 22, respectively.

In a wide portion of the case 15 , a filter element 14 having a circular truncated cone shape is mounted on a mounting base 16 at a rear portion and is located above the lower convex portion 15 a and is provided with a bolt 17.
It is detachably attached by. To the inner diameter side of the filter element 14, the intake passage 13 is coupled through a rear portion of the case 15, connecting of the intake passage 13
The connected part (passage formed in the mounting base 16) is
It extends to the rear side of the filter element 14 in the purifier.
The opening 13a of the intake passage connecting portion is more than the lower convex portion 15a.
The intake passage connecting portion is arranged above and substantially along the filtering surface of the filtering element 14. Due to the positional relationship between the connecting portion of the intake passage 13 having the opening 13a and the filtering surface of the filtering element 14 as described above, the negative pressure of the engine does not locally act on the filtering surface of the filtering element 14 and is dispersed over the entire filtering surface. It is supposed to work. Ma
In addition, the opening 13a of the intake passage 13 is provided with a downward convex portion of the case 15.
By positioning it so that it is above 15a,
Even if water enters the air purifier 8, the water will be projected downward.
15a, the intake passage 13 is opened through the opening 13a.
It is designed to prevent water from entering the engine.

An opening 23 for introducing air is provided in the front portion of the lower surface of the case 15, and a drain hole 25 is provided in the bottom portion of the lower convex portion 15a . The air introduction opening 23 is arranged in a space surrounded by the head pipe 1 and the left and right main frames 2. This arrangement makes it difficult to suck in dust and water contained in the traveling wind from the front and foreign matter such as water contained in the side wind. Also, air is case 1
5 of the intake passage 13 from the front air introduction opening 23
By passing through the opening mouth, air is allowed to flow through to enable the entire space in the air cleaner.

Further, the case 15 is provided with a large circular opening 24 on the upper surface side for taking the filter element 14 in and out during maintenance work. Another resin cover 26, which covers the opening 24 and extends to the pair of left and right main frames 2, is detachably attached to the upper surface of the case 15. In order to make the cover 26 detachable, the front end side is fastened together with the front end of the case 15 to the bracket 18 with bolts 19, but the left and right sides of the rear end side are between the horizontal pipe 20 and the main frame 2. The rubber tubes 28 attached to the brackets 27, 27 fixed to the. The rubber tube 28 has a small-diameter constricted part in the middle part, and the notch 26 of the cover 26 is formed in the constricted part.
It is designed to insert a. Therefore, the cover 2
6 If it spreads out on both the left and right sides against the elasticity of itself, it can be easily removed from the constricted portion.

According to the above-mentioned intake system device, the air purifier 8 is provided in the upper region of the main frame 2, and is surrounded by the head pipe 1 and the left and right main frames 2 to have a vertical width.
The air purifier 8 has a large capacity because it is widened toward the rear and is formed to fill the space , so that the engine output can be greatly improved. Further, since the air introduction opening 23 is provided in the front part of the air purifier 8 and is arranged in the space surrounded by the head pipe 1 and the left and right main frames 2, dust or dust contained in the running wind or cross wind can be prevented. Makes it difficult to inhale foreign matter such as water. In addition, the filter element
Intake 14 having an opening 13a arranged on the rear side of the attachment 14
By making the passage connecting portion along the filtration surface of the filtration element 14, the negative pressure of the engine is reduced.
4 does not act locally on the filtering surface to prevent its local damage. Therefore, to reduce the frequency of replacement of the filter element 14, the interval of maintenance can be long <br/> Kusuru.

Further, in addition to increasing the volume of the case 15 as described above, a large opening 24 for taking in and out the filtering element is provided on the upper surface of the case 15, and the opening is covered with a detachable cover 26. Since it is in a position where it can be worked in a standing posture of height, the filtration element 14
It is possible to easily carry out the inserting and removing work by simply removing the cover 26 with the case 15 attached. In addition,
In the illustrated embodiment, the case of a motorcycle has been described, but the present invention is also applicable to other saddle riding type vehicles such as a motorcycle.

[0015]

As described above, the intake system device of the present invention is
Of the pair of left and right main frames that extend rearward from the head pipe
An air purifier is placed on top and a cylinder is placed below the main frame.
Two or three wheels equipped with an engine that stands upright above the front
In a saddle type vehicle such as a car, the pair of left and right main frames
Is inclined downward from the head pipe toward the rear.
It is formed to widen the left and right space while
Set the shape of the purifier in plan view so that the width in the left-right direction
Widen the left and right spacing to be approximately the same as the left and right spacing of the main frame.
It has a wide width, and its top view is almost water.
It is flat and the lower surface goes up and down from the head pipe side to the rear.
To have a downward protruding portion that is wide so as to be wide
And an opening for introducing air at the front of the air purifier.
The head pipe and the left are provided with the opening for introducing the air.
While arranging in a space surrounded by a pair of right main frames,
Install a filter element inside the wide part of the air purifier.
Is installed and the lower convex portion is provided below the filtration element.
Arranged at the rear of the air purifier, through the carburetor
An intake passage communicating with the cylinder is connected, and a connection portion of the intake passage is connected.
Extending to the rear side of the filtration element in the air purifier
So that the opening of the intake passage connecting portion is located above the downward convex portion.
And the intake passage connecting portion is connected to the filter
Arranged so as to be substantially along the filtration surface of the element,
The rear of the cylinder, while the air purifier
Installed directly above the cylinder, the intake air from the rear of the air purifier
A passage is extended to the carburetor, and the air purifier and intake
Around the road and carburetor from above the cylinder to the rear.
Because it has a configuration that incorporates, it has the following excellent effects.
Is what you do. That is, the left and right width of the air purifier
Widen the left-right spacing to be approximately the same as the left-right spacing of the main frame
To be wide, and the upper and lower widths become wider toward the rear.
Since it was formed like this, the space between the pair of left and right main frames is
Can be effectively used to have a high volume
It becomes large because that, thereby improve the output of the engine.

Further, since the opening for introducing air is provided in the front portion of the air purifier and is arranged in the space surrounded by the head pipe and the pair of left and right main frames, traveling wind from the front and left and right cross winds are generated. Since it is difficult to suck in foreign matter such as dust and water, and the intake passage connecting part that has an opening is arranged along the filtration surface of the filtration element, the engine negative pressure does not act locally on the filtration surface of the filtration element. Prevent local stains. Therefore, the replacement frequency of the filter element can be reduced, and the maintenance work can be facilitated. Also, make sure that the lower surface of the air purifier has a downward convex
And the intake passage opening is located above the downward projection.
Therefore, even if water enters the air purifier,
Since the water is guided to the downward convex part, from the opening of the intake passage
Water can be prevented from entering the engine side. Also
In addition, a carburetor is installed in the rear of the cylinder that is erected above the front of the engine.
The main frame and a pair of left and right main frames above the main frame.
Install an air purifier located between the chambers directly above the cylinder to clean the air.
Install an air intake passage from the rear of the purifier to the carburetor to clean the air.
The air intake, the intake passage and the carburetor from the upper side of the cylinder to the rear side.
Since it is arranged to wrap around, the cylinder rear above the engine
The device can be placed compactly by effectively utilizing the side space.
And the opening of the intake passage connecting part is more
Turn the intake passage upward from the rear of the air purifier to the carburetor.
Because of the guidance, the device can be arranged reasonably.

[Brief description of drawings]

FIG. 1 is a side view of a motorcycle including an intake system device of the present invention.

FIG. 2 is an enlarged side view showing a part of a cross section of the intake system device.

FIG. 3 is a plan view of the intake system device.

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

[Explanation of symbols]

1 Head Pipe 2 Main Frame 4 Engine 4a Cylinder 6 Seat 8 Air Purifier 9 Vaporizer 13 Intake Passage 13a (Intake Passage) Opening 14 Filter Element 15 Case 15a Convex Downward
Part 23 (air introduction) opening

Claims (1)

(57) [Claims] 1. A air purifier placed on top of the pair of left and right main frames extending from a head pipe rearward, equipped with an engine provided upright cylinder above the front portion below the main frame
In a saddle-ride type vehicle such as a motorcycle or a tricycle, the pair of left and right main frames are formed so as to incline downward and widen in the left and right direction from the head pipe toward the rear, and the air cleaner has a plan view. The shape is formed to be wide so that the width in the left-right direction is approximately the same as the left- right interval of the pair of left and right main frames, and the left- right interval is widened .
In a side view shape, the upper surface is substantially horizontal and the lower surface is the head pie.
Projecting downwards so that it becomes wider in the vertical direction from the
Formed to have a downward convex portion, an air introduction opening is provided in the front portion of the air purifier, and the air introduction opening is surrounded by the head pipe and the pair of left and right main frames. The air purifier becomes wider while it is placed in
A filter element is provided inside the part and the filter element
The lower convex portion is disposed on the lower side of the air purifier, an intake passage communicating with the cylinder via a carburetor is connected to the rear portion of the air purifier, and the connecting portion of the intake passage is connected to the inside of the air purifier. The filtration of
Element to the rear side and open the intake passage connection.
The mouth is located above the downward protrusion and the suction
The air passage connecting portion is arranged so as to be substantially along the filtration surface of the filtration element, and the carburetor is arranged behind the cylinder.
On the other hand, the air purifier is installed directly above the cylinder,
The intake passage is extended from the rear of the purifier to the carburetor,
The air purifier, the intake passage, and the carburetor are installed in the cylinder.
An intake system device for saddle-ride type vehicles such as motorcycles and tricycles, which is arranged to wrap around from the upper side to the rear side .