JP2002302083A - Air intake port structure for motorcycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently supply air to an engine by increasing an opening area of an air intake port provided in a cowling, and make the air not taken into the air intake port flow to the rear side while straightening it. SOLUTION: The air intake port 103 is provided in a front cowling 101 for covering a front part of a body, and a tip of an air duct extended from the air intake port 103 is connected to an air cleaner, in this motorcycle 10. The air suction port 103 is provided in each of left and right side positions of a front fork 31. A notched part of a dog leg shape in side view is provided in the front cowling 101 to be adjacent to the air suction port 103. The air not taken into the air intake port 103 is made to flow along the notched part 104.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an air inlet structure for a motorcycle.

[0002]

2. Description of the Related Art The intake system structure of a motorcycle is such that an air intake is provided in a cowling that covers a front portion of a vehicle body, and an end of an air duct extending from the air intake is connected to an air cleaner. As such an exhaust system structure of a motorcycle, for example, Japanese Unexamined Patent Application Publication No. 9-86463 "Motorcycle" (hereinafter referred to as "prior art") is known.

The above prior art is disclosed in FIGS.
As shown in FIG. 1, one air inlet 17 is provided at the center of the vehicle width at the front of the upper cowling 12 (the number is quoted from the official gazette; the same applies hereinafter). Extend duct 18 and branch duct 1
8 relates to an intake system structure in which an air cleaner 16 is connected at the end.

However, in the above-mentioned conventional technology, only one air inlet 17 is provided at the center position of the vehicle width, and there is a limit in increasing the opening area of the air inlet 17. Further, even when the front wheel 3 is lifted most, it is necessary to prevent the air inlet 17 from interfering with the front wheel 3.
If the height of the air inlet 17 is increased so as not to interfere, the height of the entire motorcycle 1 also increases, which is not a good idea.

[0005] In order to solve such a problem, for example, a structure such as that described in Japanese Patent Application Laid-Open No. 2000-95168, entitled "Motorcycle wind duct mounting structure" (hereinafter referred to as "prior art"). Can be considered.

In the above prior art, as shown in FIGS. 1 and 2 of the publication, two left and right air intakes 17, 17 are provided at the front of a cowling 16, and these air intakes 1 are provided.
Extend the traveling wind ducts 18, 18 backward from 7, 17
The present invention relates to an intake system structure in which an air cleaner 7 is connected to the ends of traveling wind ducts 18,18. The traveling wind generated on the front of the cowling 16 while traveling on the motorcycle 1 can be taken in from the air intakes 17, 17. According to the above-described conventional technique, the air intakes 17, 17 are disposed on the left and right sides, which is advantageous in increasing the opening area of the air intakes 17, 17, and the air intakes 17, 17 interfere with the front wheel 10. I will not.

[0007]

In the above-mentioned prior art, the traveling wind that does not enter the air intakes 17, 17 flows rearward along the cowling 16. However, the cowling 16 has a rounded and bulged shape as a whole. Traveling wind that does not enter the air intakes 17 may hit the cowling 16 and become turbulent. Reducing such turbulence is advantageous in improving the running performance of the motorcycle 1. The same applies to the above conventional technology.

Accordingly, it is an object of the present invention to (1) increase the opening area of an air intake port provided in a cowling to sufficiently supply air to an engine and (2) rectify air that does not enter the air intake port. It is an object of the present invention to provide a technique capable of flowing backward.

[0009]

According to a first aspect of the present invention, an air intake is provided in a cowling that covers a front portion of a vehicle body, and a tip of an air duct extending from the air intake is connected to an air cleaner. In the motorcycle having the above structure, the air intake ports are respectively provided at the left and right outer positions of the front fork, and a notch having a U shape in a side view is provided on the cowling and adjacent to the outside of the air intake port. It is characterized in that air that cannot enter the mouth can flow along the cut portion.

Since the air inlets are provided at the left and right outer positions of the front fork, the opening area of the air inlets is increased, so that the layout of other surrounding members is less likely to be restricted. For this reason, the opening area of the air suction port can be increased and air can be sufficiently supplied to the engine. As a result, the engine performance can be more sufficiently exhibited. In addition, since the air inlets are provided on the left and right with respect to the front wheel at the center of the vehicle width, the air inlet does not interfere with the front wheels even when the front wheels are lifted most. Therefore,
Since there is no need to increase the height of the air intake, there is no restriction on the design of the motorcycle. Further, a cut-out portion having a U-shape in a side view is provided on the cowling and adjacent to the outside of the air inlet so that air that does not enter the air inlet can flow along the cut-in portion. The air that does not enter the mouth can flow backward while rectifying the air. Therefore, it is advantageous in improving the running performance of the motorcycle.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Note that "before", "after",
“Left”, “right”, “up”, and “down” follow directions seen from the driver. Also, the drawings should be viewed in the direction of reference numerals.

FIG. 1 is a right side view of a motorcycle according to the present invention, and shows an appearance of a motorcycle 10. Motorcycle 10
Are mounted on a front portion of the vehicle body frame 20 via a front fork 31, a rear wheel 34 mounted on a rear portion of the vehicle body frame 20 via a swing arm 33, and mounted on a lower portion of the longitudinal center of the vehicle body frame 20. Engine 40
And an air cleaner 53, a fuel tank 55, and a seat 56 attached to the upper portion of the longitudinal center of the body frame 20.

The present invention is characterized in that the engine 40 is disposed between the front and rear wheels 32 and 34, and a silencer 70 is disposed below the engine 40. Silencer 7
0 is to be attached to the vehicle body frame 20 or the engine 40.

The cowling 100 of the motorcycle 10
The front cowl 101 covers the upper part of the front part of the vehicle body, the left and right middle cowls 111 (only the right side is shown in this figure; the same applies hereinafter) that covers the middle part of the vehicle body, and the left and right parts cover the lower part of the vehicle body and the side surfaces of the silencer 70 Lower cowl 121 and a rear cowl 131 surrounding the rear of the vehicle body.

The front cowl 101, the left and right middle cowls 111, and the left and right lower cowls 121 are splitably coupled to each other by screws. More specifically, the cowling 100 allows the upper front part of the left and right middle cowls (front side cowl) 111 to be able to be divided with respect to the lower part of the front cowl 101, and at the front position of the silencer 70, the lower rear end of the middle cowl 111. In contrast, the front end of the lower cowl (rear cowl) 121 can be divided.

The front cowl 101 has a windscreen 102 at the top and a pair of left and right air intake ports 103 at the front. Further, a recess 112 is formed at the lower rear end of the middle cowl (front cowl) 111 toward the center of the vehicle body, and a front opening 122 is formed at the front end of the lower cowl (rear cowl) 121.
A large air guide port 123 for cooling the silencer 70 can be formed by combining the recess 112 with the recess 112.

Further, FIG. 2 shows that a rear fender 140 disposed below the rear cowl 131 is attached to the swing arm 33. According to the present invention, the lower edge 132 of the rear cowl 131 is inclined substantially linearly rearward and upward, and the upper surface 141 of the rear fender 140 is moved to the lower edge 132 of the rear cowl 131.
Characterized in that it is inclined substantially linearly rearward and upward so as to be parallel to.

In the figure, reference numeral 47 denotes an engine crankshaft;
Is a cover member (crankshaft cover), 91 is a handle,
92 is a mirror, 93 is a headlamp, 94 is a turn signal,
95 is a front fender, 96 is a rear cushion unit, and 97 is a cushion link. The rear part of the silencer 70 extends to the vicinity of the cushion link 97.

FIG. 2 is a perspective view of the main part of the intake / exhaust system structure of the motorcycle according to the present invention. Intake system 5 of motorcycle 10
1 is a pair of left and right air intake ports 103 provided on the front cowl 101 shown in FIG.
It comprises a pair of left and right air ducts (intake ducts) 52, 52 extending rearward from 3 and an air cleaner 53 connected to the ends of these air ducts 52, 52. The air cleaner 53 is connected to the pair of left and right main pipes 2 of the body frame 20.
It was arranged between 1, 21. 22 is a head pipe.

The engine 40 is a four-cylinder engine in which four exhaust ports 41 to 44 are arranged in a row on the left and right at an upper front portion, and has an oil pan 45 at a lower rear portion. Motorcycle 1
The exhaust system 58 is a device that exhausts exhaust gas through an exhaust pipe 60 extending from the exhaust ports 41 to 44 of the engine 40 and a silencer 70 connected to the exhaust pipe 60.

As the silencer 70, a type in which a gas outlet 74 is provided near the gas inlet 73 is used. Silencer 7 with gas inlet 73 facing rear wheel 34
0 is arranged below the engine 40 and the exhaust pipe 60 is connected to the gas inlet 73 of the silencer 70 in a state of extending to the vicinity of the rear wheel 34.

Here, regarding the four exhaust ports, the first exhaust ports 4 are arranged in this order from the left side of the vehicle body (the right side in the figure) to the right side.
1, second exhaust port 42, third exhaust port 43, fourth exhaust port 44
Say The exhaust pipe 60 includes four pipes (a first pipe 61, a second pipe 62, a third pipe 63 and a fourth pipe 64), and three collecting pipes (a first collecting pipe 65, a second collecting pipe 66, and a third pipe). Collecting cylinder 67).

The first pipe 61 having one end connected to the first exhaust port 41 extends to the lower right, and further extends to the rear while passing through the right side of the oil pan 45. Similarly, the second exhaust port 42
The second pipe 62 having one end connected to the oil pan 45 also extends to the lower right, and further extends rearward while passing through the right side of the oil pan 45. Then, the other end of the first pipe 61 and the other end of the second pipe 62 are connected to a first collecting cylinder 65 to be collected into one. The first collecting cylinder 65 extends rearward while passing through the right side of the oil pan 45, and further extends leftward.

On the other hand, the third pipe 63 having one end connected to the third exhaust port 43 extends downward and leftward, and further extends rearward while passing through the left side of the oil pan 45. Similarly, the fourth pipe 64, one end of which is connected to the fourth exhaust port 44, extends to the lower left, and then extends rearward while passing through the left side of the oil pan 45. Then, the other end of the third pipe 63 and the fourth pipe 6
By connecting the other end of 4 to the second collecting cylinder 66, they are collected into one. The second collecting cylinder 66 extends rearward while passing through the left side of the oil pan 45.

Further, by connecting the other end of the first collecting cylinder 65 and the other end of the second collecting cylinder 66 to the third collecting cylinder 67,
Gather together. Thus, the four pipes 61 to 6
4 can be combined into one third collecting cylinder 67. Then, the third collecting cylinder 67 extends rearward and is connected to the gas inlet 73.

FIG. 3 is a plan sectional view of the silencer according to the present invention. The silencer 70 includes a tubular tubular portion 71 that is elongated and closed in the front and back, a gas inlet 73 and a gas outlet 74 provided at a rear end 72 of the tubular portion 71, and three expansion chambers in the tubular portion 71 in the longitudinal direction. It comprises a first partition plate 78 and a second partition plate 79 for partitioning into 75 to 77.

In this manner, the rear end 72
The first expansion chamber 75, the second expansion chamber 76, and the third expansion chamber 77 can be provided in this order from the front (to the right in this figure). The first expansion chamber 75 communicates with the gas inlet 73, the third expansion chamber 77 communicates with the first expansion chamber 75 via a first communication pipe 81, and the second expansion chamber 76 communicates with the third expansion chamber 77. 82
, The gas outlet 74 is connected to the second expansion chamber 76 by the third communication pipe 83, and the tail pipe 84 is connected to the gas outlet 74. Exhaust gas is supplied to the first, second and third expansion chambers 75 to 7
The exhaust sound can be attenuated by the expansion effect when the vehicle enters the position 7.

Next, the operation of the exhaust system 58 having the above configuration will be described with reference to FIG.
It will be described based on. The silencer 70 is arranged below the engine 40 with the gas inlet 73 facing the rear wheel 34, and the exhaust pipe 60 is connected to the gas inlet 73 with the exhaust pipe 60 extended to the vicinity of the rear wheel 34. The exhaust pipe 60 extending from the gas inlet 73 to the gas inlet 73 can be lengthened. Since the long exhaust pipe 60 is used, even when the high-output engine 40 is mounted, the performance of the engine 40 can be sufficiently exhibited. Moreover, a heavy silencer 7 is disposed below the engine 40 disposed between the front and rear wheels 32 and 34.
Since 0 is arranged, the center of gravity of the vehicle can be lowered to reduce the inertia of the rolling, and it is advantageous in balancing the weight of the front and rear of the vehicle body.

FIG. 4 is a front view around the air inlet of the motorcycle according to the present invention. Right and left air inlets 103 are provided at left and right outer positions of the front fork 31, respectively. Air inlet 1
Right and left notches 104,
This indicates that 104 is provided. Air inlets 103, 103
Is provided with foreign matter intrusion prevention nets 105, 105.

As described above, the air suction ports 103, 103
Since they are provided at the left and right outer positions of the front fork 31, respectively, in order to increase the opening area of the air suction ports 103, 103,
It is less likely to be restricted by the layout of other surrounding members. For this reason, the opening area of the air suction ports 103, 103 can be increased, and the air (running wind) can be sufficiently supplied to the engine 40 (see FIG. 2). As a result, the performance of the engine 40 can be more sufficiently exhibited.

Further, since the air inlets 103 are provided on the left and right with respect to the front wheel 32 at the center of the vehicle width, even when the front wheel 32 is fully lifted,
The air suction ports 103, 103 do not interfere with each other. Therefore, there is no need to increase the height of the air intake ports 103, 103, and there is no restriction on the design of the motorcycle 10.

FIG. 5 is a perspective view of the vicinity of the air intake port of the motorcycle according to the present invention, in which the cutout portion 104 formed integrally with the front cowl 101 has a shape of “C” in side view. In addition, it indicates that the air Wi that does not enter the air suction port 103 can be caused to flow along the cut portion 104. The cut portion 104 includes a lower inclined surface 106 and an upper inclined surface 107. These lower and upper inclined surfaces 10
6,107 side corners are relatively large curved surfaces.

A notch 104 having a U shape in a side view is provided on the front cowl 101 and adjacent to the outside of the air suction port 103, and air (running wind) Wi that does not enter the air suction port 103 is formed in the notch 104. Since the air Wi can be made to flow along the air inlet 103, the air Wi that does not enter the air suction port 103 can be made to flow rearward while being rectified. Therefore, it is advantageous in improving the running performance of the motorcycle 10.

The lower inclined surface 106 is an inclined surface facing upward from the front to the rear. Since the lower inclined surface 106 is inclined as described above, by passing the air Wi, it can function as an air spoiler that generates a downward force for pressing the motorcycle 10 downward.

Air (running wind) Wi flows rearward and upward along the lower inclined surface 106, and passes rearward through side corners. In this manner, when the air Wi passes through the lower inclined surface 106, a downward force Fd for pressing the motorcycle 10 downward is generated. As a result, the lift Fu generated during traveling can be reduced by the downward force Fd. Therefore, comfortable high-speed running performance can be obtained while maintaining the grip force of the tires of the front wheels 32 (see FIG. 1).

[0036]

According to the present invention, the following effects are exhibited by the above configuration. In the first aspect, since the air intake ports are provided at the left and right outer positions of the front fork, the layout of other surrounding members is less likely to be restricted in increasing the opening area of the air intake port. For this reason, the opening area of the air suction port can be increased and air can be sufficiently supplied to the engine. As a result, the engine performance can be more sufficiently exhibited. Moreover, since the air intake ports are provided on the left and right sides of the front wheel located at the center of the vehicle width, the air intake ports do not interfere with the front wheels even when the front wheels are lifted most. Therefore, there is no need to increase the height of the air intake, and there is no restriction on the design of the motorcycle. Further, a cut-out portion having a U-shape in a side view is provided on the cowling and adjacent to the outside of the air inlet so that air that does not enter the air inlet can flow along the cut-in portion. The air that does not enter the mouth can flow backward while rectifying the air. Therefore, it is advantageous in improving the running performance of the motorcycle.

[Brief description of the drawings]

FIG. 1 is a right side view of a motorcycle according to the present invention.

FIG. 2 is a perspective view of a main part of the intake / exhaust system structure of the motorcycle according to the present invention.

FIG. 3 is a plan sectional view of a silencer according to the present invention.

FIG. 4 is a front view around the air intake of the motorcycle according to the present invention.

FIG. 5 is a perspective view around an air intake port of the motorcycle according to the present invention.

[Explanation of symbols]

10: motorcycle, 31: front fork, 32: front wheel, 34: rear wheel, 40: engine, 51: intake system, 52
... air duct, 53 ... air cleaner, 58 ... exhaust system, 6
0 ... exhaust pipe, 61 ... first pipe, 62 ... second pipe, 63 ... third pipe, 64 ... fourth pipe, 65
.., A first collecting cylinder, 66... A second collecting cylinder, 67.
70: silencer, 73: gas inlet, 74: gas outlet,
100 ... cowling, 101 ... front cowl, 103
… Air inlet, 104… notch.

Claims (1)

[Claims] 1. A motorcycle in which an air intake port is provided in a cowling that covers a front portion of a vehicle body, and a tip of an air duct extending from the air intake port is connected to an air cleaner. Provided at each of the left and right outer positions, a cutout having a U shape in a side view is provided on the cowling and adjacent to the outside of the air suction port,
An air intake port structure for a motorcycle, wherein air that does not enter the air intake port can flow along the cut portion.