JPH10196478A - Air cleaner device of motorcycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To equalize the flow of fresh air to respective outlet parts without generating any dead space in a cowling by decreasing intake resistance through a process of increasing the filtration area of a filter, simultaneously, by preventing interference of intake air through a process of increasing the volume of the clean side. SOLUTION: A filter 29 is formed into a cylindrical shape and installed on the bottom surface of a cleaner box 25 so as to be erected, the inner peripheral side of the filter 29 is taken as the dirty side A, the outer peripheral side is taken as the clean side B. An inlet part 35 is so provided as to extend downward from the filter 29 installation part of the bottom surface of the cleaner box 25 and as to be positioned between front and back cylinders 5F, 5R of an engine 4, a pair of right and left air ducts 42L, 42R whose front ends are opened are provided on the front surface of a cowling 2 for covering the vehicle body, and the air ducts are inserted through the cowling 2, their terminal parts are respectively bent inward, passing between pipe members for constituting a vehicle body frame, and connected to the right and left side surfaces of the inlet part 35.

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 motorcycle.

[0002]

2. Description of the Related Art Many motorcycles are provided with an air cleaner device near an engine. For example, in the case of an engine having the most general layout in which a plurality of cylinders are arranged in a line in the vehicle width direction, a cleaner box serving as a main body of the air cleaner device is installed behind the cylinder of the engine. The inside of the cleaner box is divided into a dirty side and a clean side with a flat filter therebetween, and an inlet is provided on the dirty side and an outlet is provided on the clean side.

[0003] The inlet portion is provided at the front upper portion of the cleaner box or the like, and an air duct connected to the inlet portion extends forward and opens to the frontmost portion of a cowling that covers the body of the motorcycle. The outlet portion is formed in a plurality of tubes extending forward from the cleaner box, and these outlet portions are connected to an intake device (such as a carburetor) of each cylinder.

[0004] When the motorcycle travels, traveling wind from the front flows into the dirty side of the cleaner box via the air duct and the inlet, and this air passes through the filter to remove dust and the like, and then flows into the clean side. Clean air is distributed to the engine cylinder from each outlet.

[0005]

However, in the case of a motorcycle equipped with an engine having a V-shaped cylinder arrangement in a side view, a plurality of outlets extending from a cleaner box installed above the engine are respectively provided. Since it is necessary to direct the cylinder back and forth, if the fresh air is introduced from the inlet provided at the front upper part of the cleaner box as described above, it is difficult for the fresh air to flow evenly to each outlet Become. For this reason, the flow of fresh air to the outlet section leading to a specific cylinder is deteriorated, the combustion state in each cylinder becomes uneven, and the performance of the engine tends to become unstable.

Further, since a conventional flat filter cannot have a large filtration area, the intake resistance tends to increase, and the volume of the clean side is limited. Is likely to occur, and an effective air cleaner device cannot be configured.

Further, if an inlet portion is provided in another portion of the cleaner box so as to equalize the flow of fresh air to the front and rear outlet portions, piping of an air duct connected from the outside to the inlet portion becomes difficult. There is a concern that an unnecessary dead space may occur.

The air cleaner device for a motorcycle according to the present invention has been invented in order to solve such a problem. The first object of the present invention is to reduce the intake resistance by increasing the filtration area of a filter. In addition, the capacity of the clean side is increased to prevent intake interference, and to equalize the flow of fresh air to each outlet without generating a dead space in the cowling.

A second object of the motorcycle air cleaner device according to the present invention is to stabilize engine performance by uniformly flowing fresh air flowing from an inlet portion of a cleaner box to each outlet portion. is there.

[0010]

In order to achieve the first object, an air cleaner device for a motorcycle according to the present invention has a V-shaped cylinder arrangement in a side view as described in claim 1. A cleaner box is installed above the engine, a filter is installed in this cleaner box, one side of the filter is a dirty side, the other side is a clean side, an automatic part with an inlet part on the dirty side and an outlet part on the clean side In a motorcycle air cleaner device, the filter is formed in a tubular shape and installed so as to stand on the bottom surface of a cleaner box. The inner peripheral side of the filter is a dirty side, the outer peripheral side is a clean side, and the inlet portion is a cleaner box. The engine extends downward from the filter Provided so as to be located between the front and rear cylinders, while providing a pair of left and right air ducts with front ends open in the front of the cowling that covers the car body, passing these air ducts through the cowling, and bending the ends of the air ducts inward respectively And connected to the left and right side surfaces of the inlet section through between pipe members constituting the vehicle body frame.

In order to achieve the second object, an air cleaner device for a motorcycle according to the present invention is characterized in that the outlet portion is provided with a filter on the bottom surface of a cleaner box. These outlets were connected to the intake devices of the cylinders before and after the engine, respectively.

According to the first aspect of the present invention, when the air cleaner device for a motorcycle is constructed, the fresh air flowing from the inlet portion flows evenly through the entire peripheral surface of the cylindrical filter. The filtration area of the filter is increased, and the intake resistance is significantly reduced. Further, since the space around the filter formed in a cylindrical shape is entirely on the clean side, the volume of the clean side is increased, and the interference of the intake air is prevented.

In addition, the inlet portion is located between the cylinders of the engine arranged in a V-shape when viewed from the side, and the end portions of the left and right air ducts curve inward and pass between the pipe members of the body frame. Connected to the outlets, the flow of fresh air to each outlet can be equalized without generating useless dead space in the cowling.

According to a second aspect of the present invention, there is provided an air cleaner device for a motorcycle, in which fresh air that has passed through the filter from the inlet and flowed to the clean side is distributed back and forth across the filter. Because the air flows evenly to the outlet, the fresh air is supplied to the cylinders before and after the engine in a well-balanced manner, and the combustion state of each cylinder is made uniform, and the engine performance is stabilized.

In addition, since the filter is located between the outlets, the intake negative pressure at one outlet is less likely to affect the intake pressure at the other outlet. Is prevented.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a left side view showing an example of a motorcycle to which the air cleaner device according to the present invention can be applied, and FIG. 2 is a plan view of the motorcycle.
FIG. 3 is an enlarged left side view of the vicinity of the frontal part of the motorcycle.

The motorcycle 1 is of a road sports type in which a front part is covered with a streamlined cowling 2.
An engine 4 is suspended from the front half of the body frame 3. The engine 4 is a two-cylinder engine in which two cylinders 5F and 5R are arranged in a V-shape as viewed from the side as shown in FIG.

A front fork 7 supporting a front wheel 6 is rotatable left and right along with a handlebar 8 and a brake device 9 on a head pipe 3a (see FIG. 3) provided on the front head of the body frame 3. And a pivot shaft erected in the vehicle width direction at the lower center of the body frame 3
A swing arm 13 supporting a rear wheel 12 is rotatably supported up and down on the rear wheel 11, and the power of the engine 4 is transmitted to the rear wheel 12 via a chain 14.

Further, a fuel tank 15 is provided in the upper part of the front half of the vehicle body frame 3, and subsequently, a seat 16 and a pillion seat 17 are provided. Reference numeral 18 denotes an exhaust muffler. Further, the cowling 2 is provided with a transparent window screen 20, a headlamp 21, and the like, and air intakes 22, 22, which open forward, are provided on the left and right of the headlamp 21.

The air cleaner device 24 according to the present invention is provided above the engine 4. The air cleaner device 24 mainly includes a cleaner box 25 made of hard synthetic resin and installed above the engine 4. As shown in FIG. 3, a concave portion 15a which is concaved upward is formed on the lower surface of the fuel tank 15, and the cleaner box 25 is housed in the concave portion 15a.

FIG. 4 is a longitudinal sectional view of the air cleaner device 24. The cleaner box 25 has a structure that can be divided vertically, for example, along a dividing line C, and a cap 26 is detachably provided on an upper surface 25a of the cleaner box 25.

The bottom surface 25b of the cleaner box 25 is formed with a ventilation tube 27 extending vertically so as to penetrate a substantially central portion thereof.
A fitting frame 28 is formed on the upper surface side of the fitting frame 25b.
A cylindrical filter 29 is fitted to the outer periphery of the tube 28 from above.
In other words, the cylindrical filter 29 is provided to stand on the bottom surface 25b of the cleaner box 25. In addition, as shown in FIG. 5, the filter 29 is located almost directly above the crankshaft 31 of the engine 4.

The upper portion of the filter 29 is pressed from above by the cap 26, whereby the filter 29 is fixed in the cleaner box 25. By removing the cap 26, the filter 29 can be taken out of the cleaner box 25, and the filter 29 can be replaced, washed, and the like. Note that seal members 32 and 33 are interposed between the upper and lower surfaces of the filter 29, the bottom surface 25b of the cleaner box 25, and the cap 26.

The inner peripheral side of the filter 29 is a dirty side A and the outer peripheral side is a clean side B. An inlet 35 is provided on the dirty side A side, and outlets 36F and 36R are provided on the clean side B side.

The inlet portion 35 is formed in the shape of a bottomed cylinder using the same hard synthetic resin as the cleaner box 25, and the filter 29 on the bottom surface 25 b of the cleaner box 25 is formed.
Is installed so as to extend downward from the portion where the is installed, that is, the portion of the ventilation tube 27. Connection holes 37, 37 (see FIG. 3) are formed in the lower left and right side surfaces of the inlet portion 35.

The inlet 35 is located between the front and rear cylinders 5F and 5R of the engine 4 because the filter 29 is located right above the crankshaft 31 of the engine 4. The engine 4 is located inside the inlet 35.
A valve device 38 which is operated by the intake negative pressure or the like is provided, so that the passage area of the ventilation tube 27 is always adjusted to an optimum size by the valve device 38.

On the other hand, two outlets 36F and 36R are provided in front of and behind the filter 29 so as to sandwich the filter 29. These two outlet portions 36F and 36R are formed in a short cylindrical shape using a material such as rubber which is softer than the cleaner box 25, and the bottom surface 25 of the cleaner box 25 is formed.
B is fitted air-tightly into circular holes 39, 39 formed in b.

The front and rear outlet portions 36F and 36R are respectively connected to the front and rear cylinders 5 of the engine 4 as shown in FIG.
F, 5R are connected to the intake devices 41F, 41R. Here, a fuel injection type throttle body is used as the intake devices 41F and 41R, but an intake device such as a carburetor may be used.

By the way, as described above, the motorcycle 1
Tubular air ducts 42L, 42R are connected to a pair of left and right air intakes 22, 22 provided in a streamlined cowling 2 covering the frontal part of the vehicle. These air ducts 42
L, 42R extend rearward through the inside of the cowling 2, and the ends of the air ducts 42L, 42R are curved inward, respectively, and are connected to the left and right connection holes 37, 37 of the inlet 35.

As shown in FIG. 3, the front half of the body frame 3 is formed by combining a plurality of pipe members 3b to 3e, and the end portions of the air ducts 42L and 42R are connected to the pipe members 3b to 3e. Between the inlet section
It is connected to 35 connection holes 37,37. Each air duct 42
The chamber 43 provided near the front ends of the air ducts L and 42R collects and removes moisture and the like contained in the air passing through the air ducts 42L and 42R.

The air cleaner device 24 is configured as described above. When the motorcycle 1 travels, the traveling wind from the front as shown by arrows in FIG.
Inlet part of cleaner box 25 through L, 42R
Flow into 35. The traveling wind first enters the dirty side A as fresh air, and then enters the clean side B after passing through the filter 29 to remove dust and the like. Then, clean air is distributed to the cylinders 5F, 5R of the engine 4 from the front and rear outlets 36F, 36R.

The air cleaner device configured as described above
According to 24, the fresh air flowing from the inlet portion 35 flows uniformly through the entire peripheral surface of the cylindrical filter 29, so that the filtration area of the filter 29 can be increased, and the intake resistance can be reduced. It can be greatly reduced. Also,
Since the entire space around the cylindrical filter 29 can be used as the clean side B, the clean side B
, The intake interference can be effectively prevented.

In addition, the inlet 35 is located between the cylinders 5F and 5R of the engine 4 arranged in a V-shape when viewed from the side. Pipe members 3b to
3e, it is connected to the connection holes 37, 37 of the inlet part 35, so that the flow of fresh air to each outlet part 36F, 36R is equalized without generating useless dead space in the cowling 2. can do.

The fresh air that has passed through the filter 29 from the inlet 35 and flowed to the clean side B is
Outlet part 36, which is divided back and forth across
Since the air flows evenly to the F and 36R, fresh air is supplied to the cylinders 5F and 5R before and after the engine 4 in a well-balanced manner, and the combustion state of the two cylinders 5F and 5R becomes uniform. Therefore,
The performance of the engine 4 can be stabilized.

Moreover, two outlets 36F, 36R
Since the filter 29 is located between the outlets 36A and 36R, the intake negative pressure at one outlet 36F or 36R is less likely to affect the intake pressure at the other outlet, and in this regard, it is possible to prevent the occurrence of intake interference. it can.

[0036]

As described above, the motorcycle air cleaner device according to the present invention has a filter formed in a tubular shape and installed on the bottom surface of the cleaner box, and the inner peripheral side of the filter is dirty. The side and outer circumference are clean sides, and the inlet is extended downward from the filter installation part on the bottom of the cleaner box so as to be located between the front and rear cylinders of the engine, while the front end is open at the front of the cowling that covers the vehicle body A pair of left and right air ducts are provided, these air ducts are passed through the cowling, the ends of the air ducts are curved inward, and connected to the left and right side surfaces of the inlet through the pipe members forming the body frame. Is what you do.

In this way, it is possible to increase the filtration area of the filter and reduce the intake resistance, and at the same time, increase the clean side volume to prevent intake interference.
Further, the flow of fresh air to each outlet can be equalized without generating useless dead space in the cowling.

Further, in the air cleaner device for a motorcycle according to the present invention, the outlet portion is provided on the bottom surface of the cleaner box so as to be divided back and forth with a filter interposed therebetween.
These outlets are connected to the intake devices of the cylinders before and after the engine, respectively.

Therefore, fresh air can be supplied to the cylinders before and after the engine in a well-balanced manner, and the combustion state of each cylinder can be made uniform to stabilize the engine performance. In addition, the intervening filter prevents the negative intake pressure in one outlet from affecting the intake pressure in the other outlet, so that the occurrence of intake interference can also be effectively prevented in this respect.

[Brief description of the drawings]

FIG. 1 is a left side view showing an example of a motorcycle to which an air cleaner device according to the present invention can be applied.

FIG. 2 is a plan view of the motorcycle.

FIG. 3 is an enlarged left side view of the vicinity of the frontal head of the motorcycle.

FIG. 4 is a longitudinal sectional view of the air cleaner device.

FIG. 5 is a longitudinal sectional view of an air cleaner device, an engine, and a cowling showing one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motorcycle 2 Cowling 3 Body frame 3b-3e Pipe member which comprises a body frame 4 Engine 5F, 5R Cylinder 22,22 Air intake 24 Air cleaner device 25 Cleaner box 25b Cleaner box bottom surface 29 Filter 35 Inlet part 36F, 36R Outlet part 41 Intake device 42L, 42R Air duct A Dirty side B Clean side

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI F02M 35/024 501 F02M 35/024 501C

Claims (2)

[Claims] 1. A cleaner box is installed above an engine having a V-shaped cylinder arrangement in a side view, a filter is installed in the cleaner box, one side of the filter is a dirty side, and the other side is a clean side. In a motorcycle air cleaner device having an inlet portion on a side and an outlet portion on a clean side, the filter 29 is formed in a tubular shape and installed so as to stand on the bottom surface 25b of the cleaner box 25. Dirty side A on the circumferential side,
The outer peripheral side is defined as a clean side B, and the inlet portion 35 extends downward from the filter 29 installation portion on the bottom surface 25b of the cleaner box 25 to extend the cylinders 5F,
5R, a pair of left and right air ducts each having a front end opening at the front of the cowling 2 covering the vehicle body.
42L and 42R are provided, and these air ducts 42L and 42R are passed through the cowling 2, and the ends of the air ducts 42L and 42R are respectively bent inward, so that the inlet portions 35 pass between the pipe members 3b to 3e constituting the vehicle body frame 3. An air cleaner device 24 for a motorcycle, wherein the air cleaner device 24 is connected to left and right side surfaces of the motorcycle. 2. The outlets 36F, 36R are provided separately on the bottom surface 25b of the cleaner box 25 with the filter 29 interposed therebetween, and the outlets 36F, 36R are provided.
For the cylinders 5F and 5R before and after the engine 4
The motorcycle air cleaner device 24 according to claim 1, which is connected to 41F and 41R, respectively.