JP3970543B2 - Air intake structure of motorcycle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air inlet structure of a motorcycle.
[0002]
[Prior art]
The intake system structure of a motorcycle is such that an air inlet is provided in a cowling that covers the front of the vehicle body, and the tip of an air duct extending from the air inlet is connected to an air cleaner. As such an exhaust system structure of a motorcycle, for example, Japanese Unexamined Patent Publication No. 9-86463 “Motorcycle” (hereinafter referred to as “Conventional Technology (1)”) is known.
[0003]
The above-mentioned prior art {circle around (1)}, as shown in FIGS. 1 to 3 of the publication, is the center position of the vehicle width at the front of the upper cowling 12 (the numbers are those cited in the publication; the same applies hereinafter). 1 is provided with a single air inlet 17, a branch duct 18 is extended rearward from the air inlet 17, and an air cleaner 16 is connected to the tip of the branch duct 18.
[0004]
However, the conventional technique {circle around (1)} has only one air inlet 17 at the center position of the vehicle width, so there is a limit to 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 overall height of the motorcycle 1 also increases, which is not a good idea.
[0005]
In order to eliminate such a point, for example, a configuration as disclosed in Japanese Patent Application Laid-Open No. 2000-95168 “Motorcycle wind duct mounting structure of a motorcycle” (hereinafter referred to as “conventional technology (2)”) is adopted. Can be considered.
[0006]
In the prior art {circle around (2)}, as shown in FIGS. 1 and 2 of the same publication, two left and right air intakes 17 and 17 are provided at the front portion of the cowling 16, and rearward from these air intakes 17 and 17. The present invention relates to an intake system structure in which the traveling air ducts 18 and 18 are extended to the front and the air cleaner 7 is connected to the ends of the traveling air ducts 18 and 18. Traveling wind generated on the front surface of the cowling 16 during traveling of the motorcycle 1 can be taken in from the air intake ports 17 and 17.
According to the prior art {circle around (2)}, since the air intakes 17 and 17 are arranged on the left and right, it is advantageous in increasing the opening area of the air intakes 17 and 17, and the air intake 17 and 17 does not interfere.
[0007]
[Problems to be solved by the invention]
In the conventional technique (2), the traveling wind that does not enter the air intake ports 17 and 17 flows rearward along the cowling 16. However, the cowling 16 has an overall rounded and swollen shape. A traveling wind that does not enter the air intake ports 17 and 17 may hit the cowling 16 and become turbulent. Reducing such turbulent flow is advantageous for improving the running performance of the motorcycle 1.
The same applies to the conventional technique (1).
[0008]
Accordingly, the object of the present invention is to (1) increase the opening area of the air inlet provided in the cowling to sufficiently supply air to the engine, and (2) rearward while rectifying the air that does not enter the air inlet. It is to provide a technique that can be made to flow.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a first aspect of the present invention relates to a motorcycle in which an air suction 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 suction port is connected to an air cleaner. A mouth is provided at each of the left and right outer positions of the front fork. It is characterized by being able to flow along.
[0010]
Since the air suction ports are provided at the left and right outer positions of the front fork, respectively, the area of the air suction port is increased, and the layout of other members is less likely to be limited. For this reason, the opening area of the air inlet can be increased and air can be sufficiently supplied to the engine. As a result, the engine performance can be more fully exhibited.
In addition, since the air suction ports are provided on the left and right of the front wheel in the center of the vehicle width, the air suction port does not interfere with the front wheels even when the front wheel is lifted most. Therefore, since there is no need to increase the height of the air inlet, there is no restriction on the design of the motorcycle.
In addition, a notch that has a cross-section 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 notch. Air that does not enter the mouth can be rectified and flow backward. Therefore, it is advantageous for improving the running performance of the motorcycle.
According to a second aspect of the present invention, the cut portion includes a lower inclined surface and an upper inclined surface, and the lower inclined surface is an inclined surface that faces upward from the front to the rear.
A downward force for pressing the motorcycle downward is generated by passing air during traveling through a lower inclined surface, which is an inclined surface that faces upward from the front to the rear. As a result, the lift generated during traveling can be reduced by the downward force. Accordingly, it is possible to maintain a comfortable gripping performance of the front wheel tire and to obtain a comfortable high speed driving performance.
According to a third aspect of the present invention, the air suction port has a substantially triangular shape as viewed from the front of the vehicle body, and has a side that is curved toward the front wheel.
Even when the front wheel is lifted most, the air suction port does not interfere with the front wheel. Therefore, since there is no need to increase the height of the air inlet, there is no restriction on the design of the motorcycle.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
Note that “front”, “rear”, “left”, “right”, “upper”, and “lower” follow the direction seen from the driver. The drawings are to be viewed in the direction of the reference numerals.
[0012]
FIG. 1 is a right side view of a motorcycle according to the present invention and shows an appearance of a motorcycle 10.
The motorcycle 10 includes a front wheel 32 attached to the front portion of the vehicle body frame 20 via a front fork 31, a rear wheel 34 attached to the rear portion of the vehicle body frame 20 via a swing arm 33, and a lower central portion of the vehicle body frame 20. And an air cleaner 53, a fuel tank 55, and a seat 56 attached to the upper center of the longitudinal direction of the body frame 20.
[0013]
The present invention is characterized in that the engine 40 is disposed between the front and rear wheels 32 and 34, and the silencer 70 is disposed below the engine 40. The silencer 70 is attached to the vehicle body frame 20 or the engine 40.
[0014]
Further, the cowling 100 of the motorcycle 10 includes a front cowl 101 that covers the upper part of the front part of the vehicle body, left and right middle cowls 111 that cover the middle part of the front part of the vehicle body (only shown on the right in the figure, and the same applies to the following). The left and right lower cowl 121 covering the side surface of the silencer 70 and the rear cowl 131 surrounding the rear part of the vehicle body.
[0015]
The front cowl 101, the left and right middle cowls 111, and the left and right lower cowls 121 are coupled to each other by screws. More specifically, the cowling 100 can divide the upper front part of the left and right middle cowls (front cowls) 111 with respect to the lower part of the front cowl 101, and the lower rear end part of the middle cowl 111 at the front position of the silencer 70. On the other hand, the front end portion of the lower cowl (rear cowl) 121 can be divided.
[0016]
The front cowl 101 includes a wind screen 102 at the top and a pair of left and right air suction ports 103 at the front.
Further, a recess 112 that is recessed toward the center of the vehicle body is formed at the lower rear end of the middle cowl (front cowl) 111, and a front opening 122 is formed at the front end of the lower cowl (rear cowl) 121. And the depression 112 can be combined to form a large air inlet 123 for cooling the silencer 70.
[0017]
Furthermore, this figure shows that the rear fender 140 disposed below the rear cowl 131 is attached to the swing arm 33. In 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 inclined substantially linearly rearward and upward so as to be parallel to the lower edge 132 of the rear cowl 131. It is characterized by.
[0018]
In the figure, 47 is a crankshaft of the engine, 48 is a cover member (crankshaft cover), 91 is a handle, 92 is a mirror, 93 is a headlamp, 94 is a blinker, 95 is a front fender, 96 is a rear cushion unit, 97 is This is a cushion link. The rear part of the silencer 70 extends to the vicinity of the cushion link 97.
[0019]
FIG. 2 is a perspective view of an essential part of the intake / exhaust system structure of the motorcycle according to the present invention.
The intake system 51 of the motorcycle 10 includes a pair of left and right air suction ports 103 provided in the front cowl 101 shown in FIG. 1 and a pair of left and right air ducts (intake ducts) 52 extending rearward from the air suction ports 103. 52 and an air cleaner 53 connected to the ends of these air ducts 52 and 52. The air cleaner 53 is disposed between the pair of left and right main pipes 21 and 21 of the vehicle body frame 20. Reference numeral 22 denotes a head pipe.
[0020]
The engine 40 is a four-cylinder engine in which four exhaust ports 41 to 44 are arranged in a left and right row in an upper front portion, and includes an oil pan 45 in a lower rear portion.
The exhaust system 58 of the motorcycle 10 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.
[0021]
As the silencer 70, a type in which a gas outlet 74 is provided in the vicinity of the gas inlet 73 is employed. The silencer 70 is arranged below the engine 40 with the gas inlet 73 facing the rear wheel 34 side, and the exhaust pipe 60 is extended to the vicinity of the rear wheel 34 so as to be connected to the gas inlet 73 of the silencer 70. I made it.
[0022]
Here, the four exhaust ports are referred to as a first exhaust port 41, a second exhaust port 42, a third exhaust port 43, and a fourth exhaust port 44 in this order from the left side of the vehicle body (the right side in the figure) to the right side.
The exhaust pipe 60 includes four pipes (first pipe 61, second pipe 62, third pipe 63, and fourth pipe 64) and three collective cylinders (first collective cylinder 65, second collective cylinder 66, and third pipe. A collecting cylinder 67).
[0023]
The first pipe 61 having one end connected to the first exhaust port 41 extends to the lower right and then extends to the rear while passing through the right side of the oil pan 45. Similarly, the second pipe 62 having one end connected to the second exhaust port 42 also extends rearward while passing through the right side of the oil pan 45 after extending to the lower right. Then, the other end of the first pipe 61 and the other end of the second pipe 62 are connected to the first collecting cylinder 65 to gather together. The first collecting cylinder 65 extends rearward while passing through the right side of the oil pan 45, and further extends leftward.
[0024]
On the other hand, the third pipe 63 having one end connected to the third exhaust port 43 extends to the lower left and then extends to the rear while passing through the left side of the oil pan 45. Similarly, the fourth pipe 64 having one end connected to the fourth exhaust port 44 also extends to the lower left and then extends to the rear while passing through the left side of the oil pan 45. Then, the other end of the third pipe 63 and the other end of the fourth pipe 64 are connected to the second collecting cylinder 66 to gather together. The second collecting cylinder 66 extends rearward while passing through the left side of the oil pan 45.
[0025]
Further, the other end of the first collecting cylinder 65 and the other end of the second collecting cylinder 66 are connected to the third collecting cylinder 67 to be gathered together. In this way, the four pipes 61 to 64 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.
[0026]
FIG. 3 is a plan sectional view of the silencer according to the present invention.
The silencer 70 includes a cylindrical cylindrical portion 71 that is elongated in the front-rear direction, a gas inlet 73 and a gas outlet 74 provided at the rear end 72 of the cylindrical portion 71, and three expansion chambers in the cylindrical portion 71 in the longitudinal direction. It consists of a first partition plate 78 and a second partition plate 79 that partition into 75-77.
[0027]
In this way, the first expansion chamber 75, the second expansion chamber 76, and the third expansion chamber 77 can be provided in this order in the cylinder portion 71 from the rear end portion 72 to the front (right side 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 through the first communication pipe 81, and the second expansion chamber 76 communicates with the third expansion chamber 77 through the second communication pipe. The gas outlet 74 is communicated with the second expansion chamber 76 via the third communication pipe 83, and the tail pipe 84 is connected to the gas outlet 74.
The exhaust noise can be attenuated by the expansion action when the exhaust gas enters the first, second, and third expansion chambers 75 to 77.
[0028]
Next, the operation of the exhaust system 58 configured as described above will be described with reference to FIG.
The silencer 70 is disposed below the engine 40 with the gas inlet 73 facing the rear wheel 34 side, and the exhaust pipe 60 is connected to the gas inlet 73 with the vicinity of the rear wheel 34 being extended. 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, the performance of the engine 40 can be sufficiently exerted even when the high-power engine 40 is mounted.
Moreover, since the silencer 70, which is a heavy object, is disposed below the engine 40 disposed between the front and rear wheels 32, 34, the center of gravity of the vehicle body can be lowered to reduce rolling inertia, and the weight balance between the front and rear of the vehicle body It is advantageous in taking
[0029]
FIG. 4 is a front view of the periphery of the air intake port of the motorcycle according to the present invention. Left and right air intake ports 103 are provided at the left and right outer positions of the front fork 31, respectively, and the front cowl 101 and the air intake port are provided. It shows that the left and right cut portions 104 and 104 are provided adjacent to the outside of 103 and 103. The air inlets 103 and 103 include foreign matter intrusion prevention nets 105 and 105.
[0030]
Since the air suction ports 103 and 103 are provided at the left and right outer positions of the front fork 31 as described above, the area of the air suction ports 103 and 103 is increased, and the layout of other surrounding members is limited. Hateful. For this reason, the opening area of the air inlets 103 and 103 can be increased and 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 fully exhibited.
[0031]
Moreover, since the air suction ports 103 and 103 are provided on the left and right with respect to the front wheel 32 in the center of the vehicle width, the air suction ports 103 and 103 interfere with the front wheel 32 even when the front wheel 32 is lifted most. Never do. Therefore, there is no restriction on the design of the motorcycle 10 because there is no need to increase the height of the air inlets 103, 103.
[0032]
FIG. 5 is a perspective view around the air intake port of the motorcycle according to the present invention, in which the cut portion 104 formed integrally with the front cowl 101 has a shape of “<” in side view, and the air This shows that the air Wi that does not enter the suction port 103 can flow along the cut portion 104.
The cut portion 104 includes a lower inclined surface 106 and an upper inclined surface 107. The side corners of the lower and upper inclined surfaces 106 and 107 are relatively large curved surfaces.
[0033]
A cut-out portion 104 having a cross-section in a side view is provided in 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 directed along the cut-out portion 104. Since the air can be allowed to flow, the air Wi that does not enter the air suction port 103 can be flown backward while being rectified. Therefore, it is advantageous in improving the running performance of the motorcycle 10.
[0034]
The lower inclined surface 106 is an inclined surface that faces upward from the front to the rear. Since the lower inclined surface 106 is inclined in this way, it can serve as an air spoiler that generates a downward force for pressing the motorcycle 10 downward by allowing the air Wi to pass therethrough.
[0035]
Air (running wind) Wi flows rearward and upward along the lower inclined surface 106 and passes rearward through a side corner. Thus, 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, it is possible to maintain a comfortable gripping performance of the tire of the front wheel 32 (see FIG. 1) and to obtain a comfortable high-speed running performance.
[0036]
【The invention's effect】
The present invention exhibits the following effects by the above configuration.
According to the first aspect of the present invention, since the air suction ports are provided at the left and right outer positions of the front fork, respectively, the layout area of other surrounding members is not easily restricted in increasing the opening area of the air suction port. For this reason, the opening area of the air inlet can be increased and air can be sufficiently supplied to the engine. As a result, the engine performance can be more fully exhibited.
In addition, since the air suction ports are provided on the left and right of the front wheel in the center of the vehicle width, the air suction port does not interfere with the front wheels even when the front wheel is lifted most. Therefore, since there is no need to increase the height of the air inlet, there is no restriction on the design of the motorcycle.
Furthermore, a notch that presents a cross-section in a side view is provided in the cowling , and the outside of the air suction port is provided adjacent to the inside of the car body of the notch , so that the air that does not enter the air suction port is notched. Therefore, the air that does not enter the air intake port that flows inside the vehicle body of the cut portion and outside the air intake port can be flown backward while being rectified. Therefore, it is advantageous for improving the running performance of the motorcycle.
In claim 2, the cut portion is composed of a lower inclined surface and an upper inclined surface, and the lower inclined surface is an inclined surface that faces upward from the front to the rear. By passing, a downward force for pressing the motorcycle downward is generated. As a result, the lift generated during traveling can be reduced by the downward force. Accordingly, it is possible to maintain a comfortable gripping performance of the front wheel tire and to obtain a comfortable high speed driving performance.
In claim 3, the air intake port has a substantially triangular shape when viewed from the front of the vehicle body, and the side toward the front wheel is curved. Therefore, even when the front wheel is lifted most, the air intake port interferes with the front wheel. Never do. Therefore, since there is no need to increase the height of the air inlet, there is no restriction on the design 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 a suction / exhaust system structure of a motorcycle according to the present invention. FIG. 3 is a plan sectional view of a silencer according to the present invention. 4] Front view around the air intake port of the motorcycle according to the present invention. [FIG. 5] Perspective view around the air intake port of the motorcycle according to the present invention.
DESCRIPTION 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, 60 ... Exhaust pipe, 61 ... First Pipe ... 62 ... 2nd pipe, 63 ... 3rd pipe, 64 ... 4th pipe, 65 ... 1st collecting cylinder, 66 ... 2nd collecting cylinder, 67 ... 3rd collecting cylinder, 70 ... silencer, 73 ... gas inlet, 74 ... Gas outlet, 100 ... Cowling, 101 ... Front cowl, 103 ... Air inlet, 104 ... Notch.

Claims (3)

In a motorcycle in which an air inlet is provided in a cowling that covers the front of the vehicle body, and the tip of an air duct extending from the air inlet is connected to an air cleaner.
The air inlet port, each provided outside the position of the left and right front forks, provided a cut portion presenting a shape in a side view Do the cowling, and the outer air inlet adjacent to the inboard of said notches to that provided, air inlet structure for a motorcycle, characterized in that as flown in and along the air which is not entering the air inlet to the cut portion. 2. The motorcycle air according to claim 1, wherein the cut portion includes a lower inclined surface and an upper inclined surface, and the lower inclined surface is an inclined surface that faces upward from the front to the rear. Inlet structure. The air intake structure of a motorcycle according to claim 1, wherein the air intake port has a substantially triangular shape when viewed from the front of the vehicle body and has a curved side toward the front wheel.

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