JP3178229B2 - Air introduction structure to air cleaner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for introducing air into an air cleaner.

[0002]

2. Description of the Related Art The operation of an engine starts by sucking air and gasoline, and a part related to the sucking is called an intake system. The path of the intake system starts from the intake duct, connects to the air cleaner, the carburetor, and the intake manifold, and further to the intake port of the engine. Engines produce power through the combustion of gasoline, a chemical reaction called oxidation. Therefore, it is desirable to supply as much oxygen as possible. Air has a higher density at a lower temperature, and therefore has more oxygen molecules. It can be said that warm air is good in terms of the ease of gasoline vaporization, but in consideration of problems such as overheating, cold air with a high air density (hereinafter referred to as "fresh air") is better for motorcycles.

[0003] By the way, the exhaust pipe, which becomes hot, needs to be cooled first and effectively. Therefore, in a limited body space, the intake system is rarely arranged in front of the body, and it is difficult to arrange the intake system behind the body. Often placed. However, in such an arrangement, the intake system sucks low-density air heated by the engine, the radiator, or the like.

[0004] Therefore, in the case of a motorcycle equipped with a cowling, such as a sports motorcycle, a fresh air intake is provided at the front of the cowling for taking in fresh air, from which fresh air is sent to the rear of the engine via a pipe, and directly sent to the air cleaner. The engine has been upgraded to make it possible to introduce fresh air.
However, since the fresh air intake is provided on the front of the cowling, there is a possibility that rain or the like may enter the pipes when riding in rainy weather or snowfall, which may cause a failure.

In the case of a sports bike having a strong sense of play, it is not necessary to ride in bad weather, but on the other hand, in the case of a business motorcycle used for newspaper delivery or milk delivery, it is difficult to ride because of bad weather. It does not go. A business motorcycle does not have a cowling having a sporty feeling like a sports motorcycle, but is equipped with a protective cover called a leg shield for protecting a rider's legs from rain and snow. Also, business bikes do not need to be as sophisticated as sports bikes, but rather it is more important that they do not break down even in bad weather.

Therefore, a structure for introducing fresh air into the intake system of a business motorcycle is designed from the viewpoint of enhancing the effect of preventing entry of rain and the like. For example, FIG. 12 and FIG.
In the leg shield a described in Japanese Patent No. -18338, etc., the fresh air introduction port b is directed toward the lower rear of the vehicle body to prevent rain and snow from entering the pipe.

However, since the air cleaner d is housed between the leg shield a and the main frame c on which the leg shield a is mounted, the leg shield a becomes large accordingly. .
Therefore, the leg shield a is heavy and the main frame c
However, there is a problem in terms of ease of assembling the vehicle body frame.

Further, since the storage chamber e of the air cleaner d is arranged on the upper surface of the main frame c, the storage chamber e
In addition, the leg shield a covering the main frame c comes considerably closer to the rider (not shown). As a result, the space f formed between the leg shield a and the rider becomes narrower, and when the luggage is placed on the vehicle body using the space f, the leg shield a may be an obstacle. .

Further, it is troublesome to arrange a harness and cables (not shown) between the leg shield a and the body frame with the air cleaner d interfering. Then, fix the lid g covering the opening e ₁ of the housing chamber e of the air cleaner d in the openings formed larger than e _1, and is the housing from the housing the air cleaner d in the storage chamber e the air cleaner upper surface d ' The pedestal h is placed, and the fresh air introduction port b facing the lower rear of the vehicle body is formed between the lid g and the storage chamber e. It is conceivable that raindrops or the like may enter the storage chamber e from the gap between them, and the raindrops or the like may be sent to another intake system via the connection pipe i. For this reason, it has been desired to provide a technology that can more effectively prevent the penetration of raindrops and the like.

[0010]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problem, and has been made to reduce the size of a motorcycle in which a fresh air inlet is directed to a lower rear portion of a vehicle body by reducing the protrusion of a leg shield toward a rider. In addition, the harness and cables can be easily arranged between the leg shield and the body frame, and air can be introduced into the air cleaner while effectively preventing raindrops from entering the intake system. Another object of the present invention is to provide a structure for introducing air into an air cleaner.

[0011]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems and is as follows.
That is, the structure for introducing air into the air cleaner according to the first aspect of the present invention is a reinforcing member for obliquely reinforcing a connecting portion between the head pipe and the main frame extending rearward from the head pipe to the vehicle body. The reinforcement fixed to the head pipe has a shape capable of forming a substantially closed hollow between the head pipe and the main frame, and the dimension of the reinforcement in the vehicle width direction is the vehicle width of the head pipe and the main frame. The same size as or narrower in the direction, the leg shield attached to the main frame is formed with a fresh air inlet facing the lower rear of the vehicle body, and a cylinder hole is provided at an appropriate position of the reinforcement corresponding to the fresh air inlet. Is formed in the cylindrical hole to form a communication passage connecting the fresh air inlet and the hollow. Externally fitted tightly sealing body to ensure the sealing property between the outer the surroundings, by forming a connecting hole for connecting the inlet tube of the air cleaner to the other portions of the reinforcement.

According to a second aspect of the present invention, in the structure for introducing air into an air cleaner, a cylindrical hole formed in the reinforcement is arranged at a position where the reinforcement and the leg shield come closest to each other. I do.

[0013]

Therefore, according to the structure for introducing air into the air cleaner according to the first and second aspects of the present invention, the fresh air inlet formed in the leg shield and the inlet tube of the air cleaner are formed by the reinforcement and the head pipe. The connection is established via a hollow formed by the main frame. Also, the dimension in the vehicle width direction of the reinforcement is the same as or smaller than the dimension in the vehicle width direction of the head pipe and the main frame, and the reinforcement reinforces the diagonal between the head pipe and the main frame. The hollow does not protrude in the vehicle width direction and above the vehicle body, and assumes a form as if it were a part of the vehicle body frame. In addition, since air is introduced into the air cleaner through the inlet tube, there is no need to dispose the air cleaner between the leg shield and the main frame to which the leg shield is attached unlike the related art. Therefore, the leg shield can be arranged closer to the main frame side.

Then, a cylindrical hole is formed at an appropriate position of the reinforcement corresponding to the fresh air inlet, and a communication passage connecting the fresh air inlet and the hollow in the reinforcement is formed in the cylindrical hole. And a tightly fitting seal around the communication passage to secure the seal with the outside, and a connection hole for connecting to the inlet tube of the air cleaner is formed in the other part of the reinforcement. Therefore, fresh air entering from the fresh air introduction port reaches a hollow through a communication path formed by the sealing body, and then enters the inlet tube through the connection hole and is then introduced into the air cleaner.

According to the second aspect of the present invention, since the cylindrical hole is provided at a position where the reinforcement and the leg shield come closest to each other, the leg shield is further brought closer to the main frame side. Will be able to be arranged. Therefore, the leg shield does not protrude toward the rider side, and the size and weight of the leg shield can be further reduced, so that the leg shield can be more easily attached to the vehicle body.

[0016]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an air cleaner according to an embodiment of the present invention; FIG. 1 is an overall side view of a business motorcycle employing an air introduction structure to an air cleaner of the present invention, and FIG. 2 is FIG.
3 is an exploded perspective view of FIG. 2, FIG. 4 is a cross-sectional view taken along the line IV-IV of FIG. 2, and FIGS. 5 to 11 show rubber boots as a sealing body. 6 is a front view, FIG. 7 is a left side view, FIG. 8 is a view from the direction of arrow VIII in FIG. 7, FIG. 9 is a view from the direction of arrow IX in FIG. 7, and FIG. 7 is a sectional view taken along line XX of FIG. 7, and FIG. 11 is a sectional view taken along line XI-XI of FIG.

As shown in FIG. 1, a main tube frame 4 as a main frame extends from the head pipe 2 of the business motorcycle 1 toward the rear of the vehicle body. A reinforcement 6 as a reinforcing member is fixed to the connecting portion 5 (see FIG. 3) between the head pipe 2 and the main tube frame 4 from above by appropriate fixing means such as welding.

When the reinforcement 6 is fixed to the head pipe 2 and the main tube frame 4, a substantially closed hollow 7 (see FIGS. 3 and 4) is formed between the reinforcements 6 and 4. It has a shape that can be done. That is, the reinforcement 6 includes side plates 8r and 8l each having a substantially right-angled triangular shape in a side sectional view as shown in FIG. 3, and an inclined top plate 10 connecting these, and the head pipe 2 side and the main tube frame 4 side. It is a shape that is opened at the end.
Then, the reinforcement 6 is placed on the main tube frame 4 so that the opening on the main tube frame 4 side faces downward, and after the opening on the head pipe 2 side abuts on the head pipe 2, Welded.

The distance between the side plate 8r and the side plate 8l, that is, the vehicle width direction dimension l ₁ is the vehicle width direction dimension of the head pipe 2 and the main tube frame 4, that is, the diameter l _{2 of} both members 2, 4. Is the same or slightly narrower. In the portion of the side plate 8r closer to the head pipe 2 side,
A connection hole 8r 'is formed to connect to the inlet tube 9a of the air cleaner 9. Although the location of the air cleaner 9 is not particularly shown, it is arranged below the main tube frame 4 or behind the engine 12.

A screw type boss 14 for fixing a leg shield 23 described later to the main tube frame 4 is provided substantially at the center of the top plate 10. A screw 18 is screwed to the screw type boss 14 via a cushion 16 and a spacer 17. After the leg shield 23 is attached to the main tube frame 4, the screw 18
The leg shield 23 is fixed to the main tube frame 4 by tightening.

Further, a cylindrical hole 20 communicating with the hollow 7 is formed below the portion of the top plate 10 where the screw type boss 14 is formed. The cylindrical hole 20 is formed by fixing a pipe of an appropriate size to a periphery of a through hole 10a formed in the top plate 10 by welding, and a rubber boot 21 as a sealing body described below is firmly fitted on the cylindrical hole 20. Is done. In addition,
The location where the cylindrical hole 20 is formed is the reinforcement 6
Of these, this is the place where this and the leg shield 23 are closest.

The rubber boot 21 has a shape as shown in FIGS. 5 to 11, and has a truncated cylindrical main portion 21a having an oblique cut, and a flat trumpet shape for supporting the main portion 21a. And a flange-shaped packing 21c that protrudes in a flange shape from the periphery of the main portion 21a. The rubber boot 21 is disposed between the leg shield 23 and the reinforcement 6 so as to correspond to a later-described fresh air inlet 30 of the leg shield 23, and communicates the fresh air inlet 30 with the hollow 7. This is for forming the communication passage 22 (see FIG. 4). In addition, the flange-shaped packing 21c ensures the hermeticity of the periphery of the communication passage 22 with the outside.

The leg shield 23 is attached to the main tube frame 4 so as to straddle in a saddle shape as shown in FIG. In addition, the leg shield 23
As shown in FIGS. 2 to 4, the main body 24 includes a main part 24 corresponding to the main tube frame 4 and wing parts 26, 26 protruding from the main part 24 to both left and right sides.

The surface 24a of the main part 24 on the wing part 26 side
Bosses 28 projecting to the left and right corresponding to the screw type bosses 14 are formed on the respective 24a. In addition, a fresh air inlet 30 is formed in the main surface 24b of the main part 24 to face the lower rear of the vehicle body for introducing fresh air.

The fresh air inlet 30 is in the such cut away portion corresponding to the vehicle lower side of the stepped portion 24b ₁ made by projecting parallel to the one side portion of the main surface 24b to the rear of the vehicle body shape. Then, on the back side around the peripheral wall 25 of the stepped portion 24b ₁ is 4
Stepped portion 32 is formed so as to surround the stepped portion 24b ₁ as shown in. The flange-shaped packing 21c is closely attached to the step portion 32 to prevent raindrops and snow from entering the hollow 7. With the above configuration, the air introduction structure 34 to the air cleaner is formed.

In the structure 34 for introducing air into the air cleaner having such a structure, the leg shield 2
3 and the inlet tube 9a of the air cleaner 9 are connected via the communication passage 22 formed in the leg shield 23, the cylindrical hole 20 and the hollow 7.

The dimension l ₁ of the reinforcement 6 in the vehicle width direction is equal to or smaller than the diameter l ₂ of the head pipe 2 and the main tube frame 4, and the reinforcement 6 is composed of the head pipe 2 and the main tube frame 4. 4 and 4 are reinforced diagonally, so hollow 7
Does not protrude above the vehicle body in the vehicle width direction, and assumes a form as if it were a part of the vehicle body frame.
In addition, since air is introduced into the air cleaner 9 through the inlet tube 9a, the air cleaner 9 is disposed between the leg shield 23 and the main tube frame 4 to which the leg shield 23 is attached as in the related art. You don't have to. Therefore, the leg shield 23 can be arranged close to the main tube frame 4 side. Therefore, since the leg shield 23 does not protrude toward the rider, the size and weight of the leg shield 23 can be reduced as compared with the related art, so that the leg shield 23 can be easily attached to the vehicle body.

Further, a rubber boot 21 is firmly fitted in a cylindrical hole 20 communicating with the hollow 7.
The flange-shaped packing 21c is in close contact with the step 32 formed on the inner surface of the leg shield 23, so that even if rain or snow enters the leg shield 23 as shown by a white arrow in FIG. Even if it comes, the flange-shaped packing 21c functions as a barrier and can be prevented from entering the hollow 7.

Since the air cleaner 9 does not become a hindrance between the leg shield 23 and the main tube frame 4, wiring work of harnesses and cables can be facilitated.

Further, fresh air entering from the fresh air inlet 30 reaches the hollow 7 through the communication passage 22 formed by the rubber boot 21 as shown by the black arrow in FIG. 4, and from there the connection hole 8r '. After entering the inlet tube 9 a through the air cleaner 9, the air is introduced into the air cleaner 9.

[0031]

According to the present invention, it is possible to reduce the size of the whole by reducing the protrusion of the leg shield to the rider side, and to easily arrange the harness and cables between the leg shield and the body frame. Can be. Further, air can be introduced into the air cleaner while effectively preventing raindrops and the like from entering the intake system.

[Brief description of the drawings]

FIG. 1 is an overall side view of a business motorcycle employing a structure for introducing air into an air cleaner according to the present invention.

FIG. 2 is an enlarged perspective view of a main part of FIG.

FIG. 3 is an exploded view of FIG. 2;

FIG. 4 is a sectional view taken along line IV-IV of FIG. 2;

FIG. 5 is a perspective view of a rubber boot.

FIG. 6 is a front view of the rubber boot.

FIG. 7 is a left side view of the rubber boot.

FIG. 8 is a view as seen from the direction of arrow VIII in FIG. 7;

FIG. 9 is a view as seen from the direction of arrow IX in FIG. 7;

FIG. 10 is a sectional view taken along line XX of FIG. 6;

FIG. 11 is a sectional view taken along line XI-XI in FIG. 7;

FIG. 12 is a diagram for explaining a conventional technique.

FIG. 13 is a sectional view of a main part of FIG.

[Explanation of symbols]

2 Head pipe 4 Main frame 5 Connection part 6 Reinforcement 7 Hollow 8r Other part (for reinforcement) 8r 'Connection hole 9 Air cleaner 9a Inlet tube 20 Cylindrical hole 21 Sealing body 22 Communication passage 23 Leg shield 30 New air introduction口 34 Structure for introducing air into the air cleaner. l ₁ Dimensions of reinforcement for vehicle width direction l ₂ Dimensions of head pipe and main frame for vehicle width direction

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-70228 (JP, A) JP-A 4-71394 (JP, U) JP-A 50-9914 (JP, U) JP-A 50-50 125606 (JP, U) Japanese Utility Model 60-138835 (JP, U) Japanese Utility Model 57-182521 (JP, U) Japanese Utility Model 44-18338 (JP, Y1) (58) Field surveyed (Int. ⁷ , DB name) B62J 39/00 B62M 7/02

Claims (2)

(57) [Claims] 1. A reinforcement, which is fixed between the head pipe and a main frame extending rearward from the head pipe in a diagonal manner, is provided between the head pipe and the main pipe. A shape capable of forming a substantially closed hollow with the frame, and the dimension of the reinforcement in the vehicle width direction is the same as or narrower than the head pipe and the main frame in the vehicle width direction. A fresh air inlet facing the lower rear of the vehicle body is formed in the leg shield to be mounted, and a cylinder hole is formed at an appropriate position of the reinforcement corresponding to the fresh air inlet, and the cylinder hole is formed in the cylindrical hole. A sealing body for forming a communication passage connecting the introduction port and the hollow and for ensuring a hermetic seal with the outside around the communication passage. An air introduction structure for an air cleaner, wherein a connection hole for connecting to an inlet tube of the air cleaner is formed in another part of the reinforcement in a tightly fitting manner. 2. The structure for introducing air into an air cleaner, wherein the cylindrical hole formed in the reinforcement is arranged at a position where the reinforcement and the leg shield come closest to each other.