JPH11303699A - Air cleaner arrangement structure of motorcycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the space efficiency of a car body and secure a large capacity of an air cleaner by disposing an air cleaner on the front side of a head pipe, and connecting the air cleaner to an engine arranged in the rear of the head pipe through an intake duct. SOLUTION: An air cleaner 34 is disposed on the front side of a head pipe 5a to enlarge the capacity of the air cleaner 34, and outside air can be introduced directly into the air cleaner 34 without a duct so as to use ram air. The air cleaner 34 is connected to an engine 4 in the rear by a comparatively small-diameter intake duct 35a, thereby avoiding interference of an intake system with a steering system. As the position of the air cleaner 34 is comparatively high, powder dust splashed by a front wheel 20 is prevented from applied to the air cleaner so as to introduce clean outside air. Further, an intake chamber 37 having a designated capacity is disposed so that the intake pulsation on the engine 4 side can be restrained. Furthermore, the foot rest space and the foot passing space can be secured large.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Conventionally, in a motorcycle, the outside air is purified by an air cleaner and guided to a carburetor. The carburetor mixes the fuel and the outside air and supplies the mixture to a combustion chamber of an engine. By doing so, a driving force is generated to run.

[0003]

However, in such a conventional vehicle, an air cleaner needs a certain size in order to ensure engine performance and the like, whereas a motorcycle has a particularly small space. Due to restrictions, it was difficult to provide such an air cleaner.

Accordingly, an object of the present invention is to improve the space efficiency of a vehicle body by arranging the air cleaners without difficulty while securing a large volume.

[0005]

In order to achieve the above object, according to the first aspect of the present invention, there is provided a head pipe in which a revolving shaft having a handle fixed to an upper side is rotatably inserted. A motorcycle is provided with an air cleaner, and the air cleaner is connected to an engine disposed behind the head pipe via an intake duct passing near the head pipe.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, an intake chamber is arranged behind the head pipe and in the middle of the intake duct.

[0007]

Embodiments of the present invention will be described below.

FIGS. 1 to 11 show an embodiment of the present invention. In the embodiment of the present invention, a whole scooter type vehicle which is a motorcycle including the invention will be described.

First, the structure will be described. The scooter type vehicle according to this embodiment is, as shown in FIGS. 1 and 2, generally a low-floor main footrest 3 between a handle 1 and a seat 2. An engine 4 is fixedly mounted on a body frame 5 (hereinafter, referred to as a “frame 5”) near the main footrest 3 and a rear arm 8 is mounted on a rear end of the engine 4 via a pivot shaft 7. The rear wheel 10 is supported at the rear end of the rear arm 8.

[0010] Specifically, a rear cushion 48 is interposed between the engine 4 and the rear arm 8 and the engine 4
Is a four-cycle parallel two-cylinder engine in which a cylinder portion 4a projects substantially horizontally from a crankcase 4h toward the front of the vehicle body, as described later. As shown in FIGS. 2 and 4, the frame 5, which is a skeleton, is provided with a tubular head pipe 5a at the front end, and the upper frame 5b and the lower frame 5c extend rearward from the head pipe 5a. Have been.

The upper frame 5b has a head pipe 5a.
A central pipe 5d is connected to the rear side and is extended rearward, and a pair of front pipes 5e is branched right and left from the rear end of the central pipe 5d and extended rearward. The rear pipe 5f, which is smaller in diameter than the front pipe 5e, extends rearward and obliquely upward through a box-shaped portion 5j formed by joining two sheet metals in the middle at the rear ends of the pair of front pipes 5e. It has been extended toward. Further, the pair of rear pipes 5
A cross pipe 5g along the vehicle width direction is installed on f.
Thereafter, the front end of the back stay 5h is fixed to the pipe 5f via a bracket 5i in the same manner as the box-shaped portion 5j, and the rear end of the back stay 5h is attached to the rear side of the rear pipe 5f. Directly fixed.

The lower frame 5c is provided as a pair on the left and right. Reference numeral 5Y denotes a reinforcing frame that connects the central pipe 5d and the pair of lower frames 5c.

The head pipe 5 of the frame 5
The revolving shaft 11 of the handle 1 is inserted through a and is rotatably supported. The upper end 11 a of the steering shaft 11 protruding from the head pipe 5 a is connected to the left and right front fork pipes 1 via a crown handle 13.
The lower end 11b of the steering shaft 11 protruding from the head pipe 5a is connected to the left and right front fork pipes 14 via an under bracket 16 (see FIG. 5). ).

The crown handle 13 is bent so that the central connecting portion 13a at the center is high and the front fork pipe connecting portions 13b at both ends are low, and protrudes upward from the continuous connecting portion 13a. Handle holder 13
c is integrally formed, and is die-cast with an aluminum material (Al).

The leg shield 17 is a vehicle body cover on the upper side of the front fork pipe connecting portion 13b.
The handle holder 13c formed in the reciprocating shaft connecting portion 13a faces upward from a through hole 17b formed in the leg shield upper surface 17a.

On the upper side of the steering shaft connecting portion 13a,
The handle holder 13c and the cap holder 87
, The handle 1 is fixed, the handle 1 is covered by a handle cover 19, and a cylindrical lower portion 19 a of the handle cover 19 is rotatably inserted into a through hole 17 b of the leg shield 17. ing.

The leg shield 17 covers the head pipe 5, the front fork pipe 14, and the like.

The front fork pipe 14
Is a telescopic type, the upper inner tube 14
a is slidably inserted in the lower outer tube 14b in the axial direction, and the inner tube 14a
Are urged upward by a spring (not shown), and the front wheel 20 is supported at the lower end of the outer tube 14b.

As described above, the crown handle 13 is bent so that the centrally connected reciprocating shaft connecting portion 13a is high and the front fork pipe connecting portions 13b on both ends are low. If the height of the front fork pipe connecting portion 13b is lower than before, the position of the upper surface portion 17a of the leg shield 17 covering the upper side of the front fork pipe connecting portion 13b can be lowered. The size of the leg shield 17 can be reduced.

The upper surface 17a of the leg shield 17
As a result, the upper portion of the crown handle 13 is covered, and only the reciprocating shaft connecting portion 13a of the crown handle 13 is raised to face above the through hole 17b of the leg shield 17, so that the through hole 17b is small. As a result, the size of the handle cover 19 for closing the through hole 17b can be reduced.

Further, since the crown handle 13 has a high reciprocating shaft connecting portion 13a at the center and can secure the vertical dimension H1 of the head pipe 5a, the support rigidity of the reciprocating shaft 11 by the head pipe 5a can be increased, and traveling performance can be improved. Can be improved.

Further, if the telescopic front fork pipe 14 of the type extending to the upper edge of the head pipe 5a and being connected to the left and right sides at the upper side and the lower side of the head pipe 5a is used as in this embodiment, Opposite axis 11
It can also be applied to vehicles with large displacements in combination with the improvement in support rigidity.

In this embodiment, it goes without saying that a bottom link type telescopic front fork can be applied.

On the other hand, as shown in FIG. 2, the upper part of the engine 4 has its crankcase 4h attached to the box-shaped portion 5j between the front pipe 5e and the rear pipe 5f, and to both ends of the cross pipe 5g of the rear pipe 5f. The left and right bolts 2 span the front and rear pipes 5e and 5f respectively on the fixed bracket 5k and the box-shaped bracket 5i at the lower end of the back stay 5h.
2, 23, 24 are fixed. The rear ends of the pair of lower frames 5c are squashed flat, and plate-like brackets 5m are fixed to the rear ends, respectively.
The crankcase 4h of the engine 4 is attached to the bracket 5m.
The lower front part is fixed with a bolt 25.

The fuel tank 27 supported on the frame 5 and the fuel tank 2
A luggage storage box 29 is disposed behind the seat 7, and the seat 2 is provided on the upper side thereof so as to be rotatable around a hinge 32 at the front end.

Since the engine 4 functions as a frame member by mounting the engine 4 on the frame 5 as described above, the frame pipe can be eliminated by that much, so that the body can be reduced in size and the weight can be reduced. Can be achieved. Also, the lower frame 5
Since c can be shortened and the heavy engine 4 can be set at a lower position, the center of gravity of the vehicle can be reduced.

Further, the box-shaped portion 5j and the box-shaped bracket 5
By using i, the connecting portion of the engine 4 can be easily formed.

Further, the rear cushion 48 is connected to the engine 4
The large load transmitted from each of the wheels 10, 20 in combination with the interposition between the rear arm 8 and the rear arm 8 causes the rear arm 8, the engine 4, and the frame 5 on the front side of the engine 4.
, And a large load is not transmitted to the rear pipe 5f side.
The diameter of the f side can be reduced, and the fuel tank 27
And the storage box 29 can be enlarged.

In this embodiment, the rear pipe 5f and the back stay 5h of the upper frame 5b are provided behind the engine 4, but instead, as shown in FIG. 3, aluminum die casting or sheet metal is used. By fixing the storage box 30 made of stainless steel to the engine 4 with the bolts 23 and 24, the pipe 5f and the back stay 5h can be eliminated. According to this, the frame at the rear part of the vehicle body is not required, and the size of the storage box 30 can be further increased.

On the other hand, the head pipe 5a of the frame 5
2 and 6, an air cleaner 34 is fixed to the head pipe 5a, and the air cleaner 34 and the engine 4 are connected via an intake duct 35. As shown in FIG.

More specifically, the air cleaner 34 is fixed to the head pipe 5a and the front fork pipe 14
Are arranged in such a position and shape that they do not interfere with each other even when they rotate as shown by a two-dot chain line in FIG. In addition, the intake ducts 35 are the first intake ducts 35 provided for each pair.
a, a second intake duct 35b, and an intake channel 3 between the first intake duct 35a and the second intake duct 35b.
7 are interposed. The first intake duct 35a extends rearward from the air cleaner 34, and is inserted between the head pipe 5a and the front fork pipe 14, as shown in FIGS. It is connected to the chamber 37. This intake chamber 3
7 is fixed to the frame 5, and a second intake duct 35 b is further extended from the intake chamber 37 to form a pair of carburetors 3.
The carburetor 38 is connected to the engine 4.

Reference numeral 34a denotes a suction port of the air cleaner 34, and reference numeral 34b denotes a cylindrical element provided in the air cleaner 34. The outside air sucked from the suction port 34a passes through the cylindrical element 34b, then branches and flows in the pair of first intake ducts 35a, merges once in the intake chamber 37, and branches again to form the pair of second intake ducts. Duct 3
5b is introduced into each vaporizer 38.

In the case where the engine 4 having the cylinder portion 4a projecting substantially horizontally forward is provided near the main footrest 3 in front of and below the seat 2, a relatively large volume is provided in the vicinity of the main portion. When the required air cleaner 34 is to be arranged, the footrest space S1 and the footing space S2 are narrowed. On the other hand, by arranging the air cleaner 34 in front of the head pipe 5a, the footrest space S1 and the footing space are provided. S2 can be largely secured.

The air cleaner 34 is connected to the head pipe 5
a, and the air cleaner 34 and the rear engine 4 are connected by a relatively small-diameter intake duct 35, so that interference between the intake system and the steering system can be avoided.

Further, by arranging the air cleaner 34 in front of the head pipe 5a, the capacity of the air cleaner 34 can be increased as compared with the case where the air cleaner 34 is arranged near the main footrest 3, and the air cleaner 34 is provided with a duct. The outside air can be introduced directly without using the ram air.

The position of the air cleaner 34 is relatively high, so that the dust
Clean outside air can be introduced without splashing muddy water.

By disposing an intake chamber 37 having a predetermined volume in the middle of the intake duct 35, intake pulsation on the engine 4 side can be suppressed and engine performance can be improved.

In the above embodiment, the intake duct 3
5 is a head pipe 5a and a front fork pipe 14
However, as shown by a two-dot chain line in FIG. 2, it is also possible to connect the left and right front fork pipes 14 below the under bracket 16 to connect to the engine 4.

The engine 4 is of a water-cooled type, and main footrests 3 are provided on both sides on both sides thereof. The main footrests 3 protrude upward between the main footrests 3 and extend in a tunnel shape in the front-rear direction. A center cover 40 is provided. A radiator 42 is disposed below the footrest surface of the main footrest 3 and between the front wheel 20 and the engine 4. The radiator 42 has a flat rectangular parallelepiped shape, and its longitudinal direction is arranged along the vehicle width direction. The radiator 42 is curved so that the central portion is located rearward, and slightly inclined backward so as to face obliquely upward. And is fixed to the frame 5. The radiator 42 has a tank having tanks on both sides of the core. A fan 43 for guiding outside air to the radiator 42 is provided behind the radiator 42.
Is arranged.

Further, inside the center cover 40,
A cylinder portion 4a of the engine 4 is disposed, and the cylinder portion 4a is located above a radiator 42.

Further, as shown in FIGS. 1 and 7,
On both sides of the radiator 42, the aforementioned leg shield 17 is provided.
Is extended, and an inner panel 45 is detachably provided at a lower center of the leg shield 17 as viewed from the front of the vehicle. In order to avoid interference with the front wheel 20, the leg shield 17 has a shape in which both end portions in the vehicle width direction are located forward of the vehicle from the center portion side, and louvers 17c are formed inside the both end portions. The running wind is introduced from the louver 17c and is blown to the side of the radiator 42 as indicated by the arrow in FIG. The inner panel 45 is a leg shield 1
7 is provided detachably in the opening 17d.
The louver 45a is also formed on the inner panel 45, and the running air and the outside air by the fan 43 are introduced from the louver 45a, and the inner panel 45 is fixed to the inner panel 45. The guide plate 88 guides the radiator to the radiator and blows the air to the radiator 42 as indicated by an arrow in FIG.

The upper edge of the inter panel 45 is smoothly connected to the lower surface inclined downward and downward from the intake chamber 37.

In this way, by disposing the radiator 42 below the footrest surface of the main footrest 3, the radiator 42 is formed wide enough to extend below the left and right main footrests 3. To be able to
Compared to the one placed inside the center cover 40,
The area of the radiator 42 can be increased.

Further, by disposing the radiator 42 below the footrest surface of the main footrest 3, the engine 4
And the radiator 42 can be made closer to each other, and the piping between the engine 4 and the radiator 42 can be shortened as compared with the case where the radiator 42 is arranged on the front side of the head pipe 5a.

Further, by forming louvers 45a and 17c on the inner panel 45 and the left and right front surfaces of the leg shield 17, outside air can be guided to the radiator 42 from the air guide holes of these louvers 45a and 17c, so that cooling performance is improved. Can be improved. Further, the intake chamber 3
7 is disposed below the central pipe 5d immediately after the head pipe 5a, and the lower surface 37a of the intake chamber 37 is used as a part of a baffle plate. By guiding the radiator 42 and the inside of the radiator 42 and the engine 4 from the louver 45a of the inner panel 45, the cooling of the radiator 42 and the engine 4 can be further improved.

Further, a cylinder portion 4a of the engine 4 is disposed in an upwardly projecting center cover 40 formed at the center of the both main footrests 3 in the vehicle width direction, and the cylinder portion 4a is placed above the radiator 42. The positioning has the following advantages.

That is, the radiator 4 viewed from the front of the vehicle
Since the engine cylinder portion 4a and the engine cylinder portion 4a are vertically offset from each other, the air exchanged by the radiator 42 is not blown to the engine cylinder portion 4a, so that the cooling performance can be improved.

Further, by positioning the engine cylinder portion 4a above the radiator 42, the length of the engine 4 and the radiator 42 as a whole in the vehicle longitudinal direction can be reduced to shorten the wheel base, and at the same time, the engine 4 And the radiator 42 can be brought close to each other, so that mass concentration can be achieved.

On the other hand, since the inner panel 45 is detachable, by removing the inner panel 45 together with the guide plate 88, maintenance of the engine 4 (for example, plug replacement, etc.) via the opening 17d of the leg shield 17 can be performed. It can be performed and maintenance is good.

Since the radiator 42 faces obliquely upward and is curved, a large bank angle can be obtained.

On the other hand, as shown in FIG.
, A rear cushion 48 is provided between the engine 4 and the rear arm 8. The rear cushion 48 is substantially horizontal, and a front end 48 a is rotatably attached to a lower portion of the engine 4 by a shaft 49, while a rear end 48 b is rotatably attached to the rear arm 8 by a shaft 50. . This rear cushion 48
Are adapted to receive a tensile force by a load from the rear wheel 10.

As shown in FIG. 8, the rear cushion 48 is disposed in a recess 4d between the oil pan 4b projecting below the engine 4 and the dry V-belt transmission 4c when viewed from the rear of the vehicle. ing.

As described above, the rear arm 8 is attached to the engine 4 via the pivot shaft 7 and the engine 4
By attaching the front end 48a of the rear cushion 48 to the rear end 48b and attaching the rear end 48b to the rear arm 8, the engine 4, the rear arm 8, and the rear cushion 48 can be unitized. Since assembly can be performed, the assembly operation can be simplified.

Further, since the rear cushion 48 is set at a low position, the center of gravity is reduced, and the engine 4
The rear cushion 48 is arranged near the lower side of
Mass concentration is achieved.

Moreover, the rear cushion 48 is
It is disposed substantially horizontally along the front-rear direction at substantially the center in the vehicle width direction at the lower side, and it is possible to ensure a sufficient bank angle, and it is disposed substantially vertically along the rear of the vehicle body as in the conventional case. Therefore, the space efficiency at the rear of the vehicle body can be improved.

Further, since the rear cushion 48 is disposed in the recess 4d between the oil van 4b and the dry V-belt transmission 4c, the space efficiency can be improved, the ground clearance can be secured, and the bank can be secured. The corners can be made even larger. By the way, at the rear lower end (substantially the center of gravity) of the lower frame 5c, the engine 4
A side stand 52 is attached to the bracket 5m fixed to the lower part of the bracket so as to be rotatable about a shaft 53,
As shown by a two-dot chain line in FIGS. 1 and 2, the side stand 52 is rotated and stored in a substantially horizontal state along the side surface of the engine 4, whereby the side stand 5 is stored.
Auxiliary devices (water pump 55 and water pipe 56) protruding from the side surface of the engine 4 can be protected during running or falling down.

Further, by arranging the outer pipe 56 in parallel with the side stand 52 in the stored state, the protection of the pipe 56 is further improved.

On the other hand, the main stand 58 is disposed at the rear lower surface of the engine 4 behind the center of gravity, and the engine 4 is detached from the frame 5 with the main stand 58 being used to support the engine 4. The main stand 58 has an engine 4, a rear arm 8,
The rear wheel 10, the rear cushion 48 and the like can be integrally supported, and the assemblability and maintainability of these sub-assembly units can be improved.

On the other hand, as shown in FIG. 9, the engine 4 is a water-cooled four-cycle parallel two-cylinder engine, and the driving force from a piston 4e is transmitted via a crankshaft 4f and a dry V-belt transmission 4c. The driving force is transmitted to the clutch mechanism 4g, and the driving force from the clutch mechanism 4g is transmitted to the secondary transmission device 60 provided in the rear arm 8 via the gear reduction mechanism. Incidentally, 90 is a balancer.

As shown in FIG. 9, the rear arm 8 is divided into a left division 62 and a right division 63.
The mounting bosses 62a,
63a is extended and abutted, and is fixed by three-point (A, B, C) stoppers as shown in FIG. Note that the rear end 48b of the rear cushion 48 is
It is attached so as to be sandwiched between the right and left divisions 63.

Then, the leading end portions 62 of the two divided portions 62, 63
b and 63 b are connected to both sides of the pivot shaft 7, and rear ends 62 c and 63 c of both divided portions 62 and 63 are connected to the rear wheel shaft 65.

The pivot shaft 7 is divided into two parts, left and right. The pivot shaft 7 'on the left side of the vehicle body, that is, on the left side divided portion 62 side, is bolted to the crankcase 4h.
The bipot shaft 7 ″ on the right division 63 side is fixed to the right division 63 and is rotatably supported by the crankcase 4h.

In addition, the secondary transmission device 60 is connected to the output shaft 9.
1, a first sprocket 60a is fixed, and the first sprocket 60a is connected to a second sprocket 60c via a first silent chain 60b to perform a first-stage deceleration, and is coaxial with the second sprocket 60c. The third sprocket 60d, which rotates integrally and is disposed inside the second sprocket 60c, is connected to the fourth sprocket 60f via the second silent chain 60e, so that the second stage deceleration is performed. . And
The left divided portion 62 is formed by combining a right case half 62d and a left case half 62e, is formed in a liquid-tight structure, and stores oil therein.

As described above, the engine 4 is fixed to the vehicle body side,
Further, by arranging the dry-type V-belt transmission 4c in the crankcase 4h of the engine 4 fixed to the vehicle body, the weight on the rear arm 8 side can be reduced, so that the unsprung weight can be reduced.

Further, by providing a dry V-belt transmission 4c in the crankcase 4h of the engine 4 and arranging the secondary transmission 60 in the rear arm 8, power is transmitted through a long chain exposed to the outside. Since there is no need to transmit the power, the accuracy can be improved, and by using the secondary transmission device 60 as a wet type, the service life can be extended and the frequency of maintenance and inspection can be reduced as compared with the conventional case.

Further, the first and second sprockets 60a,
60c, since the third and fourth sprockets 60d and 60f are arranged inside, the outer shape of the left divided portion 62 can be moved inward toward the rear as shown in FIG. You can take it.

On the other hand, a rear wheel shaft 65 is inserted through the fourth sprocket 60f, and the fourth sprocket 6f
A cylindrical portion 60g protrudes from 0f toward the rear wheel 10 side, and a seal material 93 seals between the cylindrical portion 60g and the right case half 62d of the left divided portion 62. As shown mainly in FIG. 10, the rear wheel 10 includes a damper 97 in a power transmission path with the rear wheel 10 of the fourth sprocket 60f.
Circlip 68
The spline shaft 67a protruding from the clutch damper 67 is inserted into the fourth sprocket cylinder portion 60g and connected to the spline 99. A brake caliper 70 into which the rear wheel axle 65 is inserted is disposed between the rear wheel 10 and the right split portion 63.

The rear wheel 10 and the clutch damper 67
With the damper 97 compressed strongly, the circlip 6
8 to be integrated.

With this configuration, when the rear wheel axle 65 is pulled out, the caliper 70 comes off, and a gap (movement allowance C) is generated between the rear wheel 10 and the rear arm right side divided portion 63,
By moving the rear wheel 10 to the right division 63 side,
The spline 99 connection between the fourth sprocket 60f and the clutch damper 67 can be easily removed. And
As described above, the clutch damper 67 and the rear wheel 10, which require a great deal of labor for connection, can be attached and detached by these units without separating, and the simple operation of simply removing the spline 99 connection is sufficient. And the like, and it is not necessary to remove the fourth sprocket 60f and the like on the secondary transmission device 60 side.
It is not necessary to attach / detach 0e or the like, and the maintainability can be significantly improved. In particular, since the secondary transmission device 60 in the rear arm left divided portion 62 is of a wet type, it is very advantageous that the secondary transmission device 60 does not need to be disassembled.

Even when the spline 99 is hard to be disengaged, the circlip 68 allows the clutch damper 67 to be disengaged.
And the rear wheel 10 are prevented from being separated from each other.

By the way, the engine 4 here is a parallel 2
As shown in FIG. 8, the two exhaust pipes 84, which are cylinders and extend rearward from the cylinder portion 4a, pass through the right side of the rear cushion 48 and are disposed on the right side of the rear wheel 10 when viewed from behind. Connected to the muffler 85. Needless to say, the two exhaust pipes 84 may be converged to one as shown by the two-dot chain line in FIG. 8, and the exhaust pipes 84 are divided right and left as shown in FIG. Can also be connected. In the embodiment shown in FIG. 11, the main stand 58 and the rear cushion 48 are distributed to the left and right.

On the other hand, as shown in FIGS. 2 and 4, a fuel tank 27 is disposed above the engine 4 and supported between a pair of rear pipes 5f. Reference numeral 29 is disposed so as to be supported between the pair of rear pipes 5f and the back stay 5h.

The fuel tank 27 has a fuel supply port 27a at the top.
Is provided, and by opening the lid 2a of the seat 2, refueling can be performed from the refueling port 27a.

As shown in FIG. 8, on the upper surface of the engine 4 below the fuel tank 27, a recess 4i is located between the dry V-belt transmission 4c and the clutch mechanism 4g.
A wiring 72 such as a brake wire or a wire harness is inserted into a space formed by the recess 4i and the fuel tank 27, and hot air of the engine 4 is generated by running wind passing through the recess 4i. Since the heat is released to the rear of the vehicle body, the heat radiation is improved.

By disposing the heavy fuel tank 27 above the engine 4, mass concentration can be achieved.

On the other hand, as shown in FIG. 2, the storage box 29 has a full face type helmet storage portion 29a disposed in a space above the pivot shaft 7 between the engine 4 and the rear wheel 10, and the helmet storage portion 29a As shown in FIG. 4, the driver's helmet 76 is placed upside down so that the longitudinal direction of the helmet 76 can be stored in the vehicle width direction. It is arranged corresponding to. Further, the storage box 29 extends rearward from the helmet storage section 29a, and the rear storage section 2
9b, a jet-type helmet 77 for a passenger can be stored. Further, during traveling, that is, in a state where the helmets 76 and 77 are not stored, a rectangular bag 78 can be stored as shown by a two-dot chain line in FIGS. 2 and 4.

The tire house 94 is formed by recessing the center of the lower surface of the rear storage portion 29b in the vehicle width direction upward.

As described above, the helmet storage portion 29a of the storage box 29 is arranged by utilizing the space above the pivot shaft 7, and the position of the helmet storage portion 29a is lowered, so that the center of gravity can be lowered. At the same time, the height of the sheet 2 disposed thereon can be reduced.

The helmet storage section 29 of the storage box 29
a corresponds to the maximum width B portion of the seat 2 and is formed so that the driver's helmet 76 is placed upside down and can be stored with the longitudinal direction directed in the vehicle width direction, so that it is possible to secure rideability and to improve the vehicle body. Enlargement in the front-rear direction can be avoided.

On the other hand, the seat 2 has a front main seat 2b and a tandem seat 2c raised rearward by one step. The main footrest 3 has a driver seated on the main seat 2b. Behind the main footrest 3, a tandem footrest 81 for a passenger sitting on the tandem seat 2c is provided.

The tandem footrest 81 is provided at a position higher than the main footrest 3, and the lower space of the tandem footrest 81, as shown in FIG. Thick crankcases 4h are arranged vertically.

Reference numeral 96 denotes a notch for improving the footing.

As described above, according to the shape of the engine 4,
By setting the positions of the main pedestal 3 and the tandem pedestal 81, the position of the main pedestal 3 is lowered when compared with the main pedestal 3 and the tandem pedestal 81 that have the same height. Main seat 2 as much as you can
The position b can also be lowered, and the footing of the driver can be improved.

Further, the space under the tandem footrest 81 higher than the main footrest 3 is used, and the wide and thick crankcase 4h of the engine 4 is disposed here to effectively use the space. Therefore, the engine 4 and the tandem footrest 81 can be efficiently arranged in an appropriate positional relationship.

Here, the tandem footrest 81 integrally formed with the main footrest 3 is shown as a footrest member for a passenger, but the invention is not limited to this. It is good, and a rod-shaped thing may be sufficient.

In the above embodiment, the present invention is applied to a scooter type vehicle as a motorcycle. However, the present invention is not limited to this, and may be applied to a general motorcycle such as a so-called sports type motorcycle. Of course.

[0087]

As described above, according to the invention described in each of the claims, the air cleaner is disposed at the front side of the head pipe, so that the space in front of the head pipe is effectively used. Space efficiency and the freedom of layout around the engine behind the bed pipe can be improved.

Further, by arranging the air cleaner on the front side of the head pipe and connecting the air cleaner to the rear engine with a relatively small-diameter intake duct, interference between the intake system and the steering system can be avoided.

Further, by disposing the air cleaner on the front side of the head pipe, the capacity of the air cleaner can be increased, the outside air can be directly introduced into the air cleaner without passing through a duct, and ram air can be used.

Further, since the position of the air cleaner is relatively high, it is possible to introduce clean outside air without dust, muddy water, etc. splashed by the front wheels.

According to the second aspect of the present invention, in addition to the above-described effects, the intake chamber is disposed in the middle of the intake duct, so that intake pulsation on the engine side can be suppressed and engine performance can be improved. It has a practically useful effect.

[Brief description of the drawings]

FIG. 1 is a side view of a scooter type vehicle according to an embodiment of the present invention.

FIG. 2 is a side view of the scooter-type vehicle according to the embodiment with a vehicle body cover removed.

FIG. 3 is a side view of the scooter type vehicle showing a modification of the storage box according to the embodiment.

FIG. 4 is a schematic plan view showing a frame, a storage box, and the like according to the embodiment.

FIG. 5 is a front view of the scooter-type vehicle with the covers according to the embodiment removed.

FIG. 6 is a schematic plan view showing an arrangement position of the air cleaner according to the embodiment.

FIG. 7 is a sectional view taken along line AA of FIG. 1 according to the embodiment.

FIG. 8 is a schematic diagram showing the arrangement positions of an engine, a fuel tank, a rear cushion, and the like according to the embodiment, as viewed from the rear of the vehicle.

FIG. 9 is a horizontal sectional view showing an engine, a rear arm, and the like according to the embodiment.

FIG. 10 is a cross-sectional view showing a connection portion between the rear wheel and the left split part according to the embodiment.

FIG. 11 is a schematic diagram showing a modification of the arrangement position of the exhaust pipe and the like according to the embodiment, as viewed from the rear of the vehicle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Handle 4 Engine 5 Body frame 5a Head pipe 11 Steering axis 34 Air cleaner 35 Intake duct 37 Intake chamber

Claims (2)

[Claims] 1. An air cleaner is provided at a front side of a head pipe in which a revolving shaft to which a handle is fixed on an upper side is rotatably inserted, and the air cleaner is connected to the head pipe via an intake duct passing near the head pipe. An air cleaner disposing structure for a motorcycle, wherein the structure is connected to an engine disposed behind the head pipe. 2. The motorcycle air cleaner installation structure according to claim 1, wherein an intake chamber is disposed behind the head pipe and in the middle of the intake duct.