JP4546003B2 - Motorcycle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a motorcycle suitable for improving the turning performance and stability of a vehicle.
[0002]
[Prior art]
A motorcycle, particularly a racing vehicle competing for speed, requires high engine performance, durability of each part, turning performance of the vehicle, stability, and the like.
The turning performance and stability of the vehicle described above are greatly influenced by the position of the center of gravity determined from the layout of the parts mounted on the vehicle body.
[0003]
Examples of the layout of such motorcycle parts include, for example, (1) Japanese Patent Laid-Open No. 2000-72074 “Motorcycle fuel tank” described in FIG. 3, that is, a fuel pump at the bottom 44 of the fuel tank 41. There is a layout in which the unit 50 is attached and the fuel pump unit 50 is built in the fuel tank 41.
[0004]
(2) Japanese Patent Application Laid-Open No. 62-11369, “Exhaust Pipe Support Device for Motorcycles” described in FIG. 2, that is, the rear exhaust pipe 20 is moved rearward from the rear cylinder 5 r of the V-type engine E. There is a layout in which the rear exhaust pipe 20 is extended vertically below the sheet S.
[0005]
Further, (3) Japanese Patent Application Laid-Open No. 9-142358, “the rear suspension of a motorcycle” described in FIG. 1, that is, the upper end of the rear cushion 4 is attached to the upper rear portion of the engine 22 and the lower end of the rear cushion unit 4 There is a layout in which these are attached to the lower part of the engine 22 and the lower part of the rear arm 2 via the link mechanism 3. In addition, about the code | symbol, what was described in each gazette was used as it was.
[0006]
[Problems to be solved by the invention]
When the above-described (1) fuel pump unit 50, (2) the rear exhaust pipe 20 and (3) the rear cushion 4 are arranged in one vehicle, the fuel pump unit 50 is located below the bottom 44. Since the upper end position of the rear exhaust pipe 20 that protrudes and extends vertically is high, it is necessary to arrange the fuel pump unit 50 and the rear exhaust pipe 20 so as not to interfere with each other. If the rear cushion 4 is further arranged in this state, it is difficult to lay out the respective parts.
[0007]
Furthermore, if the fuel pump unit 50, the rear exhaust pipe 20 and the rear cushion 4 are arranged at intervals in the longitudinal direction of the vehicle body in order to prevent interference, these components are mounted on the vehicle body in the longitudinal direction of the vehicle body. Since the vehicle moves away from the rear, the position of the center of gravity of the vehicle body moves to the rear of the vehicle body. In this case, during the turning of the vehicle, the rear side of the vehicle body tends to move in the direction opposite to the turning direction due to the centrifugal force acting on the center of gravity, and the vehicle draws a turning locus different from the direction intended by the driver.
[0008]
Accordingly, an object of the present invention is to improve the turning performance and stability of a vehicle by improving the layout of parts mounted on the motorcycle.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, according to a first aspect of the present invention, there is provided a motorcycle in which an engine is disposed substantially in the center of a vehicle body, and a fuel tank is disposed behind the engine. And attach the engine to the lower part of these main frames and attach the swing arm to the rear part of the main frame so that it can swing up and down via the pivot shaft. The exhaust pipe extending rearward from the engine is disposed below the fuel tank and on one of the left and right sides in the vehicle width direction, and the storage portion of the fuel pump provided in the fuel tank is the other on the left and right sides in the vehicle width direction. In addition, it protrudes downward from the bottom of the fuel tank to a position near the rear end of the main frame behind the rear end of the main frame. To so provided, at the top of the swing arm, attaching an upper end of the rear cushion unit to mitigate the impact transmitted to the vehicle body from the rear wheel, the main via a link device which is arranged to the lower end of the rear cushion unit below the swing arm It is attached to the lower end of the rear part of the frame, and when the swing arm swings upward, the upper end of the rear cushion unit is arranged between the exhaust pipe and the storage part of the fuel pump .
[0010]
If the fuel tank is arranged under the seat, the exhaust pipe and the fuel pump, that is, heavy parts are concentrated near the front and rear center of the vehicle body. For example, the influence of the centrifugal force acting on the rear portion of the vehicle body can be reduced. The turning performance of can be improved.
Further, since the center of gravity of the vehicle body is moved forward by the parts under the seat, the ground contact force of the front wheels is increased, and the stability of the vehicle during turning can be improved.
[0011]
According to a second aspect of the present invention, the upper end portion of the rear cushion unit is disposed below the storage portion of the fuel pump in a side view when the vehicle is stopped .
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a side view of a motorcycle according to the present invention. A motorcycle 10 includes main frames 12 and 12 as a pair of left and right body frames slightly behind a vehicle body from a head pipe 11 (the main frame 12 on the back side is The V-type 5-cylinder engine 13 is attached to the lower part of the main frames 12 and 12 and the swing arm 15 is attached to the rear parts of the main frames 12 and 12 via the pivot shaft 14 so as to be able to swing up and down. The upper end of the rear cushion unit 16 is attached to the upper front portion of the swing arm 15 and the rear wheel 17 is attached to the rear end portion of the swing arm 15. The lower end of the rear cushion unit 16 is connected to the lower end of the rear portion of the main frame 12 via the link device 18. The exhaust provided for each cylinder from the cylinder head 21 on the front side of the engine 13 The pipes 23 to 25 are extended rearward, the exhaust pipes 23 to 25 are connected to the rear right muffler 26, and the exhaust pipes 31 and 32 provided for each cylinder from the cylinder head 28 on the rear side of the engine 13 are moved rearward. The exhaust pipes 31 and 32 are connected to the left muffler 33 on the front side, a seat cowl 34 that also serves as a seat is extended from the upper part of the main frames 12 and 12 to the rear, and a fuel tank 35 is placed inside the seat cowl 34. The vehicle is provided with a fuel pump 36 disposed in the fuel tank 35.
[0013]
Here, 41 is a front fork rotatably attached to the head pipe 11, 42 is a front wheel attached to the lower end of the front fork 41, 43 is a front fender that covers the front wheel 42, 44 is an upper cowl, 45 is a middle cowl, 46 Is a low cowl, 48 is a radiator, and 51 is a tank cover.
[0014]
FIG. 2 is a side view of the main part of the motorcycle according to the present invention. Seat cowls 34 are attached to seat cowl attachment portions 55 (two on each of the left and right sides) provided on the main frame 12, and fuel is placed inside the seat cowl 34. The state which attached the tank 35 is shown. Reference numeral 56 denotes a protruding portion that protrudes from the front surface of the fuel tank 35, and 57 denotes a receiving portion that receives the protruding portion 56 via an L-shaped rubber 61 that is L-shaped in section.
[0015]
FIG. 3 is a first perspective view (partially sectional view) of the fuel tank of the motorcycle according to the present invention. The fuel tank 35 is provided with a fuel pump 36 (FIG. 1) in a pump storage portion 63 as a storage portion provided in the lower portion. And a supply side pipe 64 for supplying fuel to the engine side of the front of the vehicle body (the direction indicated by the white arrow (front) is the front of the vehicle body, the same applies hereinafter) from the fuel pump 36, Further, the return side pipe 65 for returning the fuel from the engine side is extended to the inside.
[0016]
4 is a second perspective view of the fuel tank of the motorcycle according to the present invention, and is a view of a side surface (side surface on the back side) different from the first perspective view shown in FIG.
The supply side pipe 64 and the return side pipe 65 of the fuel tank 35 pass through a recess 67 provided on the side surface of the front part of the fuel tank 35 from the front of the vehicle body, and the supply side pipe 64 passes above the rear part of the fuel tank 35, The fuel tank 35 passes through the upper wall surface of the fuel tank 35 and is connected to a fuel pump 36 (see FIG. 1) in the fuel tank 35. The return side pipe 65 extends into the fuel tank 35 through the wall surface in the recess 67.
[0017]
5 is a cross-sectional view taken along line 5-5 of FIG. 2, and shows a cross section of the rear portion of the fuel tank 35. FIG.
The fuel tank 35 is attached to the seat cowl 34 via cushioning rubbers 68. Steps 71 and 71 are provided on the left and right walls of the fuel tank 35, and the edge of the seat cowl 34 having a U-shaped cross section. The fuel tank 35 is fixed in the seat cowl 34 by providing the bent portions 72 and 72 to the stepped portions 71 and 71 via the rubber 68.
[0018]
6 is a cross-sectional view taken along line 6-6 of FIG. 2 and shows a cross section of the front portion of the fuel tank 35. FIG.
The fuel tank 35 is formed with a recess 67 for passing the supply side pipe 64 and the return side pipe 65 on the side surface. By this recess 67, the supply side pipe 64 and the return side pipe 65 are lateral to the fuel tank 35. Therefore, it does not interfere with driving and can prevent interference with others.
[0019]
FIG. 7 is a side view for explaining the lower arrangement of the fuel tank of the motorcycle according to the present invention. A pump housing 63 is provided below the fuel tank 35, and the upper end of the rear cushion unit 16 is provided below the fuel tank 35. 16a and the exhaust pipes 31 and 32 are arranged.
That is, when viewed from the side, the fuel pump 36, the rear cushion unit 16 and the exhaust pipes 31 and 32 housed in the pump housing 63 are almost overlapped on one straight line 74, and in particular, disposed at the rear part of the vehicle body. Except for the right muffler 26 (not shown), the left muffler 33, the swing arm 15, and the rear wheel 17 (not shown), the axle and rear of the front wheel 42 (see FIG. 1), for example, the center side of the vehicle body from the straight line 74. It shows that it has arrange | positioned at the vertical line 75 side which passes along the point which bisects the straight line which ties the axle shaft of the wheel | wheel 17 (refer FIG. 1). Reference numeral 76 denotes a bracket for attaching the upper end portion 16 a of the rear cushion unit 16 to the swing arm 15.
[0020]
Thus, by arranging the fuel pump 36, the rear cushion unit 16 and the exhaust pipes 31 and 32 on the vertical line 75 side, the weight of these components is concentrated on the vertical line 75 side, and the motorcycle 10 (see FIG. 1). ) Can be arranged closer to the vertical line 75.
[0021]
FIG. 8 is a perspective view for explaining the lower arrangement of the fuel tank of the motorcycle according to the present invention, as viewed from a position slightly shifted to the right side from the rear of the vehicle body.
The exhaust pipe 31 extends rearward and obliquely to the right from the left cylinder of the two rear cylinders of the V-type engine, and further extends substantially right below the swing arm 15.
Further, the exhaust pipe 32 extends rearward from the right cylinder of the two rear cylinders of the V-type engine, and further extends substantially right below the swing arm 15.
[0022]
FIG. 9 is a rear view for explaining the lower arrangement of the fuel tank of the motorcycle according to the present invention. The pump housing 63 protrudes from the lower left side of the fuel tank 35, and the exhaust pipe 31, 32 indicates that the upper end portion 16a of the rear cushion unit 16 is disposed between the pump storage portion 63 and the exhaust pipes 31 and 32.
[0023]
FIG. 10 is an operation view for explaining the operation of the motorcycle according to the present invention. When the swing arm 15 swings in the direction of the arrow, the rear cushion unit 16 is contracted and the upper end portion 16a of the fuel tank 35 is retracted. Indicates approaching the bottom. In the figure, the rear cushion unit 16 is in the most contracted state.
The pump housing part 63, which is the lowest part of the fuel tank 35, and the upper end part 16a of the rear cushion unit 16 are separated in the front and back direction of the paper surface, and thus do not interfere in this state.
[0024]
As described above with reference to FIGS. 1 and 9, the present invention firstly relates to the motorcycle 10 in which the engine 13 is disposed substantially at the center of the vehicle body and the fuel tank 35 is disposed above the engine 13. The exhaust pipes 31 and 32 extending rearward from the fuel tank 13 are disposed below the fuel tank 35 and on one of the left and right sides (here, right) in the vehicle width direction, and the pump storage 63 of the fuel tank 35 is disposed below the fuel tank 35 and It is provided on the other of the left and right sides in the vehicle width direction (here, left).
[0025]
If the fuel tank 35 is disposed under the seat cowl 34, the exhaust pipes 31 and 32 and the fuel pump 36, that is, heavy parts concentrate near the center of the vehicle body, that is, near the vertical line 75 (see FIG. 7). For example, the influence of the centrifugal force acting on the rear part of the vehicle body can be reduced, and the turning performance of the motorcycle 10 can be improved. Further, since the center of gravity of the vehicle body is moved forward by the parts under the seat cowl 34, the ground contact force of the front wheels 42 is increased, and the stability of the motorcycle 10 during turning can be improved.
[0026]
In addition, the space under the fuel tank 35 can be used effectively, and the components can be concentrated under the fuel tank 35, whereby the motorcycle 10 can be made compact.
[0027]
Secondly, according to the present invention, a swing arm 15 is swingably attached to the rear part of the main frame 12 to which the engine 13 is attached, and a rear cushion unit 16 is provided on the upper part of the swing arm 15 to reduce an impact transmitted from the rear wheel 17 to the vehicle body. The upper end portion 16a of the rear cushion unit 16 is attached, and the upper end portion 16a of the rear cushion unit 16 is disposed between the exhaust pipes 31 and 32 and the pump storage portion 63. Thus, the fuel tank 35 is disposed under the seat cowl 34. When arranged, the turning performance and stability of the motorcycle 10 can be further improved by concentrating the rear cushion unit 16, the exhaust pipes 31 and 32, and the fuel pump 36 below the seat cowl 34 near the front and rear center of the vehicle body. .
[0028]
In the present invention, the exhaust pipe and the fuel pump housing are arranged on the left and right below the fuel tank, and the rear cushion unit is arranged between them. However, the present invention is not limited to this, and the exhaust pipe is arranged on each of the left and right. A rear cushion unit may be disposed between the exhaust pipes, and a fuel pump housing may be disposed between the one exhaust pipe and the rear cushion unit.
[0029]
【The invention's effect】
The present invention exhibits the following effects by the above configuration.
The motorcycle according to claim 1 has an engine disposed substantially in the center of the vehicle body, and an exhaust pipe extending rearward from the engine is disposed below the fuel tank and on either the left or right side in the vehicle width direction, and is provided in the fuel tank. Is provided at the bottom of the fuel tank and on the other of the left and right sides in the vehicle width direction. If the fuel tank is placed under the seat, the exhaust pipe and fuel pump, that is, heavy parts are concentrated near the center of the vehicle body. Therefore, for example, the influence of the centrifugal force acting on the rear part of the vehicle body can be reduced, and the turning performance of the vehicle can be improved. Further, since the center of gravity of the vehicle body is moved forward by the parts under the seat, the ground contact force of the front wheels is increased, and the stability of the vehicle during turning can be improved.
[0030]
In the motorcycle according to claim 2, the upper end portion of the rear cushion unit is disposed below the housing portion of the fuel pump in a side view when the vehicle is stopped .
[Brief description of the drawings]
FIG. 1 is a side view of a motorcycle according to the present invention. FIG. 2 is a side view of an essential part of the motorcycle according to the present invention. FIG. 3 is a first perspective view of a fuel tank of a motorcycle according to the present invention. (Figure)
4 is a second perspective view of the fuel tank of the motorcycle according to the present invention. FIG. 5 is a sectional view taken along line 5-5 in FIG. 2. FIG. 6 is a sectional view taken along line 6-6 in FIG. FIG. 8 is a perspective view illustrating the lower arrangement of the fuel tank of the motorcycle according to the present invention. FIG. 9 is a perspective view illustrating the lower arrangement of the fuel tank of the motorcycle according to the present invention. FIG. 10 is a rear view for explaining the arrangement below the tank. FIG. 10 is an operation diagram for explaining the operation of the motorcycle according to the present invention.
10 ... Motorcycle, 11 ... Head pipe, 12 ... main inflation arm, 13 ... engine, 14 ... pivot shaft 15 ... Swing arm, 16 ... rear cushion unit, 16a ... upper end of the rear cushion unit, 17 ... rear wheel, DESCRIPTION OF SYMBOLS 18 ... Link apparatus 31 , 32 ... Exhaust pipe, 35 ... Fuel tank, 36 ... Fuel pump, 63 ... Storage part (pump storage part).

Claims (2)

In a motorcycle in which an engine is arranged at the center of the vehicle body and a fuel tank is arranged at the upper rear of the engine,
A pair of left and right main frames are extended downward from the head pipe at the rear of the vehicle body, the engine is attached to the lower part of these main frames, and a swing arm is attached to the rear part of the main frame via a pivot shaft so as to be able to swing up and down.
The fuel tank is arranged so as to extend rearward from the rear end of the main frame from above the main frame,
An exhaust pipe extending rearward from the engine is disposed below the fuel tank and on either the left or right side in the vehicle width direction ,
Near the rear end position of the previous SL mainframe from the rear end behind the and the main frame accommodating portion in the right and left of the other in the vehicle width direction of the fuel pump provided in a fuel tank, protrudes downward from the bottom of the fuel tank provided so as to,
At the top of the swing arm, attach the upper end of the rear cushion unit that reduces the impact transmitted from the rear wheel to the vehicle body,
The lower end of the rear cushion unit is attached to the lower end of the rear portion of the main frame via a link device disposed below the swing arm,
The motorcycle according to claim 1, wherein an upper end portion of the rear cushion unit is disposed between the exhaust pipe and the storage portion of the fuel pump when the swing arm swings upward . The upper end of the rear cushion unit is in the stop state of the vehicle, a motorcycle according to claim 1, characterized in that it is disposed below the housing portion of the fuel pump when viewed from the side.

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