JPH11171076A - Air cleaner for motorcycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air cleaner for a motorcycle that can be compactly arranged near a main frame formed of one bar or pipe, so as not to have functional inconvenience as the air cleaner. SOLUTION: An air cleaner 1 is arranged near a main frame A extended in bar shape. Two chambers (a right side chamber 10 and a left side chamber 20) surrounding the main frame A are connected to form a casing. Elements are arranged in the respective chambers 10, 20, and two chambers are communicated with each other on both sides (engine side and anti-engine side) with the elements as a boundary.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air cleaner disposed in an intake system for a motorcycle.

[0002]

2. Description of the Related Art Generally, a motorcycle frame includes a main frame (upper pipe) extending rearward from a head pipe. A fuel tank and a seat are mounted above the main frame, and an engine is disposed below. The main frame may be formed of a single pipe for the purpose of forming the fuel tank or the seat slim.

An air cleaner is often arranged near the main frame so as to be connected to a cylinder head of an engine. The air cleaner has a built-in element (filter element), and in order to reduce the influence of intake pulsation and reduce noise (intake noise),
It is necessary to have a sufficient volume.

However, when the main frame is formed of a single pipe, it is not easy to appropriately arrange an air cleaner near the main frame. This is because the main frame passes through the center of the vehicle body, so that it is difficult to provide an air cleaner with a large volume that is blocked by the main frame. If the air cleaner is arranged only on the left or right with respect to the main frame, it is difficult for the air cleaner to have a sufficient volume. If a large volume is provided in that case, the air cleaner will protrude greatly to the side of the vehicle body. On the other hand, there are many cases where there is no space for providing an air cleaner at a position away from the main frame.

[0005] As an example in which an air cleaner is arranged near the main frame, see Japanese Patent Application Laid-Open No. 59-137216.
There is an official gazette. In this example, as shown in FIG. 12, the casings 10 'and 20' of the air cleaner 1 'incorporating the elements 31' and 32 'are arranged one by one on the left and right sides of the main frame Q, and are formed by hollow pipes. Both casings 10 ′ and 2 through the inside of the main frame Q
0 'is connected.

[0006]

When the air cleaner 1 'is arranged as shown in FIG. 12, the main frame Q becomes thicker for the purpose of allowing the intake air to pass through and the fuel tank and the seat (neither shown) are required. In addition to being difficult to form slim, there is a disadvantage that the width (the dimension from the left end to the right end) of the air cleaner 1 'is increased, so that the left and right dimensions of the vehicle body are increased as a whole. In addition, welding is not easy because the components of the frame Q need to be airtight.
With the disadvantage that

An object of the present invention is to provide a motorcycle air cleaner which can be compactly arranged near a main frame formed by a single pipe so as not to have the above-mentioned disadvantages. It is.

[0008]

According to a first aspect of the present invention, there is provided an air cleaner for a motorcycle, wherein the air cleaner is disposed near a single main frame extending in a rod shape.
a) A casing is formed by two chambers, left and right (left and right in the traveling direction of the motorcycle), surrounding the main frame by coupling, b) elements are arranged in each chamber, and c) the elements are bordered. On the engine side (downstream side of the intake flow; clean side) and on the opposite side of the engine (upstream of the intake flow; dirty side), these two chambers are communicated with each other.

This air cleaner for a motorcycle is characterized in that
Since the casing is formed by two chambers surrounding the main frame as shown in a) and communicating with each other as shown in c), they are appropriately arranged at a position very close to the main frame so as not to cause a volumetric inconvenience. In other words, since there are two chambers on the left and right sides of the main frame, this air cleaner does not need to increase the volume of each chamber so much (thus, does not need to increase the size of the casing projected to the side of the vehicle body). The volume can be secured by the total. Moreover, since the two chambers are communicated as in the above c), the two chambers are highly integrated. On the other hand, because the two chambers are located around the main frame, the air cleaner can be compactly arranged without protruding too much from the main frame to the surroundings, for example, by making good use of the space under the fuel tank and seat. become.

[0010] Since the elements are provided in each chamber as in the above b), it is possible to secure a sufficient filtering area of the elements in order to enhance the filtering function and reduce the intake resistance. In addition, since the two chambers are communicated as described above, the setting of the carburetor does not become unsuitable even if there is a difference in the manner of contamination (degree of clogging) of the elements in each chamber.

Since the casing has a divided structure as shown in a), there is also an advantage in handling.
In the case where it is necessary to replace the air cleaner after assembling the motorcycle, this air cleaner separates the two chambers so that the main frame is not surrounded, so it can be easily removed and subsequently installed. .

In the air cleaner for a motorcycle according to the second aspect of the present invention, only the right one of the two chambers is provided with a suction port for outside air at a portion on the side opposite to the engine from the element, and is directed backward or downward ( Or, the opening is formed downward (downward). In this specification, the term "right side" means the right side in the traveling direction of the motorcycle. Similarly, "left side"
Again, it refers to the left side in the traveling direction, and "back" refers to the rear with respect to the traveling direction.

In the air cleaner according to the second aspect, although the two chambers containing the element are included in the casing, the outside air suction port is provided only in the right chamber. Although a considerable amount of intake noise is generated from the outside air intake port, the influence of noise on residents and passers-by along the road is low with respect to this air cleaner.

Although the air inlet is provided in only one chamber, in this air cleaner, the two chambers communicate with each other on the engine side and the non-engine side of the element.
c)) Therefore, the intake air flows in the other chamber in parallel. Therefore, since the elements in both chambers both filter the intake air, the intake resistance is still small. In addition, since the suction port provided only in the right side chamber is formed so as to face backward or downward (or downward), it is difficult for rain, dust, and the like to enter the air cleaner even when the motorcycle is running.

[0015] The air cleaner according to claim 3 also includes:
In each of the two chambers, a passage for intake air is formed on the engine side of the element, the passage for the right chamber is connected to the right cylinder of the engine, and the passage for the left chamber is connected to the left cylinder of the engine. It is characterized by. Here, "right cylinder" or "left cylinder" means
One or more cylinders on the right or left side of the center of the vehicle body.

The air cleaner is suitable for use in a motorcycle in which a plurality of cylinder engines are arranged horizontally (that is, an engine in which a crankshaft is arranged at right angles to the traveling direction). . Since the passages are provided in the two chambers on the left and right, clean intake air (air) that has passed through the element is supplied to the carburetor from the passages on the left and right. Then, since the above-mentioned respective passage ports are connected to the left and right cylinders of the horizontally placed engine, the intake air flowing out of the respective passage ports flows into the cylinder of the engine. Since each of the left and right passage ports is connected to the left and right cylinders of the engine without switching left and right,
The intake pipe from the air cleaner to the engine can be shortened,
The route can also be simplified.

According to a fourth aspect of the present invention, in addition to the above, an independent element is disposed in each of the two chambers, and an element is provided on a right wall surface of a right chamber and a left wall surface of a left chamber of the two chambers. It is characterized by having an access port for attachment and detachment.

In this air cleaner, a casing is formed by two chambers on the left and right as described in a), and an independent element is disposed in each chamber as described above. Each element is inserted into or taken out of the casing through the access opening formed in the right wall of the right chamber and the left wall of the left chamber as described above. The two chambers on the left and right are not arranged on one side of the main frame, but are arranged on the left and right so as to surround the same frame. Facing outward. Therefore, the operation of taking the element in and out of the opening can be easily performed. If the element inserted from the access port can be fixed in each room by some means (for example, screwing or crimping), the element can be easily replaced at any time even during operation of the engine.

[0019]

1 to 11 show one embodiment of the present invention. FIG. 1 is a plan view showing the entirety of a motorcycle air cleaner 1, and FIG. 2 is a system diagram showing a configuration of an intake system of the motorcycle including the air cleaner 1. FIG. 3 is a front view of the air cleaner 1 taken along the line III-III in FIG. 1, FIG. 4 is a side view taken along the line IV-IV in FIG. 1, and FIG. 6 is a sectional view taken along the line VI-VI in FIG. 1, and FIG. 7 is a sectional view taken along the line VII-VII in FIG. 8 is a view taken along the line VIII-VIII in FIG. 1, and FIG.
FIG. 10 is a cross-sectional view taken along the line XX in FIG. 9.
FIG. 11 is a perspective view showing the air cleaner 1 attached to the main frame A or the like of the motorcycle (the right side of the figure is the front of the vehicle body).

As shown in FIG. 11, the air cleaner 1
Is a fuel tank and a seat (both not shown) in a rear portion of the main frame A in the motorcycle.
It is attached to the lower part of. Main frame A
Frames Aa and Ab are connected to the left and right portions of the rear frame, and they extend diagonally downward and are connected to the underframe B. A seat rail pipe C is connected rearward from the main frame A and the under frame B, and a seat (not shown) is attached to an upper portion thereof.

The main frame A is formed of a single rectangular hollow rod as shown in the figure for the purpose of making the fuel tank and the seat mounted thereon slim. Two frames Aa and Ab are diagonally connected to the rear part as shown in FIG. 3 (and above). The main frame A goes through the center of the vehicle body and the frame Aa
Normally, it is extremely difficult to arrange the air cleaner 1 having a sufficient volume in such a portion where b is attached. However, in the case of this motorcycle, it is difficult to secure other parts suitable for arranging the air cleaner 1, and the like.
By arranging the air cleaner 1 in the following manner in terms of the configuration, the air cleaner 1 can be arranged at the relevant site.

That is, first, the shape of the casing is
As shown in FIG. 1, the main frame A was surrounded. If the casing is formed in a substantially C-shape as shown in the figure so as to surround the main frame A, the air cleaner 1 can be compactly arranged at a position not separated from the main frame A, the fuel tank and the seat. This is because, even if the volume is sufficient, the degree to which the air cleaner 1 projects toward the engine or to the left and right of the vehicle body can be reduced. The portions denoted by reference numerals 19 and 19a in FIG. 6 and the portions denoted by reference numerals 29 and 29a in FIG. 9 are the main frame A and the frames Aa and Ab connected thereto.
7 and FIG. 10 to avoid contact. In addition, since the battery G is disposed near the position where the air cleaner 1 is disposed, the cross section of most of the casing of the air cleaner 1 is shown in FIG.
As shown in FIG. 9, the battery is formed in an L shape so that the battery G can be arranged adjacent to the L shape.

Second, a casing having such a shape is formed by coupling the right chamber 10 and the left chamber 20. The purpose of forming the casing by combining such two chambers is to facilitate the manufacture of the casing and to easily attach the casing to the motorcycle after the body including the main frame A and the like is formed. It is what it was. As shown in FIG. 1, the left chamber 20 has a projection 23 a and a projection 25 a formed toward the right chamber 10, while the right chamber 10 has an opening 13 a and an opening 15 a formed with an O-ring ( The communication passage 13 and the communication passage 25 are formed by fitting together (not shown) to connect the insides of the two chambers 10 and 20 together. With respect to the casing thus combined, the right chamber 10 is mounted on the mounting seat Ac on the frame Aa as shown in FIG. 7, and the left chamber 20 is similarly mounted on the mounting seat Ad on the frame Ab as shown in FIG. The motorcycle is mounted on a motorcycle by fixing it to a part (not shown) of the frame with the first screw holes 10e and 20e. In addition, as shown in FIG.
0a and the inner portion 10b are manufactured by resin injection molding, respectively, and are formed by closing them with a plurality of bolts 10c. The left chamber 20 is also made of resin by dividing the outer 20a and the inner portion 20b in the same manner. In addition, they are closed by a plurality of bolts 20c. The groove 10d shown in FIG.
The groove 20d shown in FIG. 9 is for closing them.

Third, as shown in FIGS. 2, 7 and 10, the inside of each of the right chamber 10 and the left chamber 20 has:
Independent filter elements 31 and 32 were arranged. Since each of the elements 31 and 32 has a sufficient filtration area and is arranged in parallel, the air cleaner 1 has a high filtration capacity and a small intake resistance. Therefore, together with the first point mentioned above,
In this air cleaner 1, it can be said that there is no functional inconvenience such as insufficient volume and filtering ability. One element 31 is provided at a position between the communication passage 13 and the communication passage 25 as shown in FIG. 6 so as to partition the right chamber 10 so that there is no gap around the other.
9 is provided between the communication passage 13 and the communication passage 25 as shown in FIG. Thus, two spaces are formed in the right chamber 10 and the left chamber 20 with the elements 31 and 32 interposed therebetween, and the spaces communicate with each other via the communication passages 13 and 25. Each of these two spaces is formed with a passage 16 and 26 (FIG. 3) and a suction port 11 (FIG. 5) as described below. 22 and the clean sides (engine side) 14 and 24, respectively.

In addition to the above, this air cleaner 1 includes:
The following configuration is employed to provide various advantages in a motorcycle equipped with this. That is, 1) As shown in FIG.
One passage port 16 and 26 are provided in each of the left and right chambers 20 (two in total). As shown in FIG. 2, the carburetors 2 and 3 are connected to the passages 16 and 26, respectively, and the engine 6 is connected to the carburetors via the intake pipes 4 and 5. Since the engine 6 has two cylinders, an appropriate intake passage to each cylinder can be formed by such connection.
Since the passage 16 of the right chamber 10 is connected to the right cylinder of the horizontally placed engine 6 and the passage 26 of the left chamber 20 is connected to the left cylinder of the engine 6, the intake pipes 4.5 There are few bends and intake efficiency is high. In addition,
Such an intake path from the passages 16 and 26 of the air cleaner 1 to the engine 6 is symmetrical to the left and right, and is preferable in appearance.

2) As shown in FIG. 1, FIG. 2 and FIG. 5, the suction port 11 into which outside air flows is provided only in the right side chamber 10 and the left side chamber 20 is provided.
Does not have a suction port that opens to the outside. Since the intake port 11 where the intake sound is easily generated is provided only in the right chamber 10,
The effect of noise on residents and pedestrians along the road is low when the motorcycle travels to the left. In this air cleaner 1, since the dirty sides 12 and 22 are connected to each other via the communication passage 13 with the elements 31 and 32 interposed therebetween as shown in FIG. The intake air also flows in parallel to the left chamber 20 and flows out of the passages 16 and 26 equally through the two elements 31 and 32. As can be seen from FIGS. 4 and 11, since (the opening axis of) the suction port 11 is provided rearward and downward, it is difficult for rain, dust and the like to enter the air cleaner even when the motorcycle is running. Since the suction port 11 is provided near the right end of the right side chamber 10 as shown in FIG. 5, a battery G whose width is not small can be arranged adjacent to the air cleaner 1 as shown in the figure. .

3) As shown in FIG. 3 and the like, an element 31 is provided on the right wall surface of the right chamber 10 and the left wall surface of the left chamber 20.
・ 32 access ports 17 and 27 are provided.
Also, the inside of the air cleaner 1 and its entrance 1
As shown in FIG. 7 and FIG. 10,
Grooves 18 and 28 for holding the elements 31 and 32 by pressing and clamping are formed. Thus, the attachment of the elements 31 and 32 to the casing of the air cleaner 1 can be performed by inserting the elements 31 and 32 from the access ports 17 and 27 and pressing them into the grooves 18 and 28 to fix them. To remove the elements 31 and 32, pull them from the side of the body of the motorcycle so that the grooves 18 and 28 and the access ports 17 and 27 are removed.
The elements 31 and 32 need only be extracted from. Right room 1
0 and the elements 31 and 32 inside the left chamber 20 are separate and independent from each other, and the air cleaner 1 is disposed symmetrically with respect to the center line (main frame A) of the vehicle body and its left and right wall surfaces are Since both are exposed to the side of the vehicle body, such work can be easily performed. That is, the replacement of the elements 31 and 32 is extremely easy, and can be performed while the engine 6 (FIG. 2) is idling. In the air cleaner 1, the dirty side 12
・ Communication path 1 between 22 and clean sides 14 and 24
3 and the communication passage 25, even if one of the elements 31 or 32 is clogged, the influence on the cab setting is small. Therefore, even in that case, both elements 31 and 32 do not have to be replaced immediately. The elements 31 and 32 are not fixed to the grooves 18 and 28 by crimping.
It can also be fixed by screwing to 0a and 20a.

[0028]

The air cleaner for a motorcycle according to the first aspect has the following effects. That is, a) Since the casing is formed by two chambers surrounding and communicating with the main frame, the casing can be compactly arranged at a position very close to the main frame, and can have a sufficient volume.

(B) Since the elements are provided in each chamber and the two chambers communicate with each other before and after the elements, a sufficient filtering area of the elements can be obtained to enhance the filtering function and reduce the intake resistance.

(C) Since the two chambers are communicated with each other, the carburetor setting is unlikely to be inappropriate even if the elements in each chamber differ in the way they are contaminated (that is, the degree of clogging).

D) Since the casing has a two-chamber divided structure, it is easy to remove or attach the air cleaner to the vehicle body when it is necessary to replace the air cleaner after assembling the motorcycle.

In the air cleaner for a motorcycle according to the second aspect of the present invention, e) since the air inlet is provided only in the right-hand room, the influence of noise on residents and passers-by along the road is small.

(F) Since the suction port is formed so as to face backward or downward (or downward), rain, dust and the like are unlikely to enter the air cleaner even when the motorcycle is running.

[0034] In the air cleaner according to the third aspect of the present invention, g) each of the left and right passage openings is connected to the left and right cylinders of the engine without exchanging the left and right. Can be shortened, and the path can be simplified.

According to the air cleaner of the fourth aspect, h) the elements of the right side chamber and the left side chamber are easily inserted or taken out from the access ports formed in the respective chambers, so that the operation of exchanging the elements is extremely easy. be able to.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of the present invention,
FIG. 1 is a plan view showing the entirety of a motorcycle air cleaner 1.

FIG. 2 is a system diagram showing a configuration of an intake system of the motorcycle including the air cleaner 1 of FIG.

FIG. 3 is a front view of the air cleaner 1 and is a view taken along the line III-III in FIG.

FIG. 4 is a side view of the air cleaner 1, and is a view taken along the line IV-IV in FIG.

FIG. 5 is a view taken in the direction of arrows VV in FIG. 4;

FIG. 6 is a view taken in the direction of arrows VI-VI in FIG. 1;

FIG. 7 is a sectional view taken along the line VII-VII in FIG. 6;

FIG. 8 is a view taken in the direction of arrows VIII-VIII in FIG. 1;

9 is a view taken in the direction of arrows IX-IX in FIG.

FIG. 10 is a sectional view taken along line XX in FIG. 9;

FIG. 11 is a perspective view showing the air cleaner 1 attached to a main frame A or the like of the motorcycle.

FIG. 12 is a plan view showing a conventional motorcycle air cleaner 1 '.

[Description of Signs] 1 Air cleaner 6 Engine 10 Right side chamber 20 Left side chamber 11 Suction port 13.25 Communication passage 16.26 Passage port 17.27 Access port 31.32 Element A Main frame

Claims (4)

[Claims] 1. An air cleaner disposed near a main frame, wherein a casing is formed by two chambers on the left and right surrounding the main frame by being connected, and an element is disposed in each chamber, and the element is separated by the element. An air cleaner for a motorcycle, characterized in that the two chambers are communicated with each other on the engine side and the non-engine side. 2. An outside air intake port is provided in a portion of the two chambers only on the right side, which is on the side opposite to the engine with respect to the element, and the opening is formed backward or downward. The air cleaner for a motorcycle according to Claim 1. 3. In each of the two chambers, an intake passage is formed closer to the engine than the element, the passage of the right chamber is connected to the right cylinder of the engine, and the passage of the left chamber is connected to the left of the engine. The air cleaner for a motorcycle according to claim 1 or 2, wherein the air cleaner is connected to a cylinder. 4. An independent element is disposed in each of the two chambers, and a door for attaching and detaching an element is provided on a right wall surface of a right chamber and a left wall surface of a left chamber of the two chambers. Claims 1 to
4. The air cleaner for a motorcycle according to any one of 3.