JPH06340281A - Evaporation system of motor-cycle - Google Patents

Abstract

PURPOSE:To prevent an evaporation system from an thermal effect of an engine or muffler. CONSTITUTION:Evaporated gas in a fuel tank 10 is sent through a breather pipe 58 and evaporating fuel pipe 36 to a canister 22 and adsorbed to the canister 22 in an evaporation system of a motor cycle. One set of left and right seat rails 16a extending back and forth to support a seat 14 are disposed below the seat 14 of the motor-cycle. Also, a set of left and right side tubes 18a extending from the approximately central part of a set of seat rails 16a forward and slantwise downward are fixed onto a set of seat rails 16a. The canister 22 is disposed below the seat rails 16a and behind the side tubes 18a and on the opposite side to the muffler 20 attaching side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an evaporative system for a motorcycle.

[0002]

2. Description of the Related Art In an evaporative system for motorcycles,
First, a canister mounting structure (first conventional technique) will be described. Generally, in a motorcycle, the fuel contained in the fuel tank evaporates to vapor and stays in the upper space of the tank. If the remaining fuel vapor is diffused into the atmosphere when the engine is stopped, the fuel for that amount is wasted. Therefore, an evaporation system is used to prevent the diffusion of the fuel vapor. This evaporative system includes, for example, a canister having an adsorbent made of activated carbon, a breather pipe extending from an upper space in the fuel tank to a vicinity of a rear end portion of the fuel tank, and a breather pipe installed in the fuel tank, the breather pipe and the canister. And an evaporative fuel pipe communicating therewith.

In the evaporative system, the fuel vapor is introduced from the upper space of the fuel tank into the canister through the breather pipe and the evaporated fuel pipe, and is adsorbed and stored in the adsorbent. Thereafter, the adsorbed fuel vapor is supplied from the canister to the carburetor through the purge pipe and burns. Therefore, the fuel vapor remaining in the upper space of the fuel tank is not wasted into the atmosphere and is not wasted.

An example of a motorcycle having the evaporation system is shown in FIG. The motorcycle shown in FIG. 9 includes a front wheel a1, a rear wheel a2, and a frame b. This frame b
Is a down tube b2 supporting the engine c, which is welded to the steering head pipe b1, extends downward, and is bent backward in the middle to have a substantially L-shape, and above the engine c welded to the steering head pipe b1. Of the tank rail b3, a main frame b4 that extends downward from the rear end of the tank rail b3 and rearward of the engine c, and is welded to the rear end of the down tube b2. A seat rail b5 that is fixed to the rear end portion and extends substantially horizontally, and extends rearward to support the seat e, and is welded to a substantially central portion of the seat rail b5, and obliquely downward and forward from here, that is, It has a side tube b6 extending toward the rear of the engine c and welded to the lower end of the main frame b4. In the engine c, a carburetor f is connected to intake holes c1 in the upper part and the rear part of the engine c. Further, a muffler g is connected to the exhaust port c2 of the upper part and the front part of the engine c. The muffler g passes below the engine c and extends to approximately the center of the rear wheel a2.

Conventionally, the canister is mounted at positions A to C shown in FIG. 9, for example. The canister h at the position A is attached between the main frame b4 and the side tube b6 and near the lower end portion of the main frame b4 (for example, JP-A-56-676).
77). The canister h at the position B is located above the rear wheel a2 and attached to the lower part of the seat rail b5. Further, the canister h at the position C is mounted on the seat rail b5 near the rear end of the seat rail b5. In FIG. 9, in the canister h at the position A, the evaporated fuel pipe i is located at the canister h at the position A.
And the breather pipe j are communicated with each other to be piped. Further, the purge pipe k connects the canister at the position A and the carburetor f and is piped. In FIG. 9, the evaporated fuel pipe i and the purge pipe k are omitted for the canisters h at the positions B and C, but as with the canister h at the position A, the evaporated fuel pipe i and the purge pipe k are omitted.
Is piped. Further, conventionally, the canister h is a frame b.
It was sometimes arranged on the muffler g side in the vehicle width direction.

Next, the structure for mounting the roll-over valve in the evaporative system of the motorcycle (second prior art) will be described. A rollover valve may be used in the evaporation system. This rollover valve is a control valve for closing the communication from the inside of the fuel tank to the canister through the breather pipe and the evaporated fuel pipe when the vehicle falls, to prevent the fuel from flowing into the canister.

A conventional example of an evaporation system having a rollover valve is shown in FIGS. 10 and 11 (FIG. 10 is a side view of the periphery of a fuel tank having a rollover valve, and FIG. 11 is a plan view thereof). In FIG. 10, the rollover valve m is a main frame b on the left side in the vehicle width direction.
It is attached to the No. 4 by a fixing tool n. Further, the evaporated fuel pipe i is divided into two (i1 and i2) in the longitudinal direction on the way, and the rollover valve m is connected to the divided portion. In this case, the rollover valve m communicates with the breather pipe j via the one evaporated fuel pipe i1, and communicates with the canister h via the other evaporated fuel pipe i2.

The fuel tank d in FIGS. 10 and 11 is of a type fixed to a frame b having a single tank rail b3 as shown in FIG. The lower surface p of the fuel tank d has a substantially saddle shape that hangs diagonally downward in the vehicle width direction. Therefore, the fuel tank lower surface p has a pair of left and right inner side surfaces (a left inner side surface p1 and a right inner side surface p2) facing the tank rail b3.

Conventionally, there are various kinds of protruding positions of the breather pipe in such a fuel tank. For example,
The conventional example shown in FIGS. 10 and 11 is a case where the lower end j1 of the breather pipe j projects downward from the upper part of the right inner surface p2.

In another conventional example shown in FIG. 13 (a) is a side view and FIG. 13 (b) is a plan view), a lower end portion j1 of a breather pipe j projects downward from a front portion of the left inner side surface p1. There is.

Further, another conventional example is shown in FIG. Figure 1
4, the fuel cock q is installed on the lower surface p of the fuel tank d. The fuel cock q communicates with the carburetor f via a fuel hose r. Further, in this conventional example, the lower end portion j1 of the breather pipe j is
Is projected in front of the fuel cock q and downward from the lower surface p of the fuel tank d, and is connected to the evaporated fuel pipe i1.

[0012]

However, the first and second conventional techniques have the following problems. First, the problems of the first conventional technique will be described. Figure 9
In the conventional example shown in, the canister h is at the position A,
That is, when installed in the main pipe b4 near the engine c, the adsorbent in the canister h is affected by the heat generated from the engine c. As a result, canister h
However, there is a problem in that the adsorption function, which is an important function of, decreases.

Further, in FIG. 9, it is conceivable that the canister h is installed at the position B, that is, below the seat rail b5 and behind the rear wheel a2. However, in a motorcycle such as an off-road vehicle in which the vertical stroke of the rear wheel a2 is large, the rear wheel a2 and the rear wheel a2
Since there is not enough space where the canister h can be installed between the seat rail b5 and the seat rail b5 above, the canister h cannot be installed in the space.

Further, in FIG. 9, when the canister h is installed at the position C, that is, near the rear end of the seat rail b5 on the seat rail b5, the distance from the fuel tank d and the carburetor f to the canister h is increased. Since the distance becomes long, both the evaporative fuel pipe i and the purge pipe k become very long, which makes installation difficult.

When the canister h is disposed on the muffler g side in the vehicle width direction, the heat generated from the engine c affects the canister h in the same manner as the heat generated from the engine c described above. However, there is a risk of adversely affecting the function of the adsorbent.

Next, the problem of the second prior art will be described. In the conventional example shown in FIGS. 10 and 11, when the muffler is mounted, for example, on the left side in the vehicle width direction, the muffler passes near the rollover valve m, so the rollover valve m reduces the influence of heat generated from the muffler. I will receive it. As a result, the rollover valve m has a hindrance in its operation. Therefore, it is conceivable to mount the muffler on the right side in the vehicle width direction. However, in the case of a vehicle having an up muffler, for example, since the muffler passes below the fuel tank d, the muffler shown in FIGS.
As in the conventional example shown in FIG. 1, the lower end j of the breather pipe j is
When 1 projects from the right inner side surface p2 of the lower surface p of the fuel tank d, the evaporated fuel pipe i1 is affected by the heat of the muffler.

When the lower end portion j1 of the breather pipe j projects from the front portion of the lower surface p of the fuel tank d as in the conventional example shown in FIG. 13, the lower end portion j1 is located on the lower surface p of the fuel tank d. Even if it projects from the inner side surface on the side opposite to the muffler mounting side (in the case of the conventional example of FIG. 13, the left side inner surface), the evaporated fuel pipe i1 is affected by heat from the cylinder portion c3 of the engine c.

Further, as in another conventional example shown in FIG.
On the lower surface p of the fuel tank d, when the lower end portion j1 of the breather pipe j projects forward from the installation position of the fuel cock q, the evaporated fuel pipe i1 passes over the fuel hose r, which makes piping very difficult. Will end up.
Also, after piping, the fuel hose r and the evaporated fuel pipe i
No. 1 contacts each other and causes a problem.

The present invention has been made to solve the above-mentioned conventional problems, and its object is to provide an evaporative system for a motorcycle in which the evaporative system is not affected by heat from an engine or a muffler. It is to be. Another object of the present invention is to provide an evaporative system for a motorcycle in which pipe distribution work in the evaporative system does not become difficult.

[0020]

To achieve the above object, the present invention has the following constitution. That is, the invention of claim 1 is an evaporative system for a motorcycle, in which an evaporated gas in a fuel tank is sent to a canister via a breather pipe and an evaporated fuel pipe to be adsorbed to the canister, in a longitudinal direction below a seat of the motorcycle. A pair of left and right first frame members that extend to support the seat is disposed, and the first pair of the first frame members is disposed.
A pair of left and right second frame members extending forward and obliquely downward from a substantially central portion of the frame member is fixed to the pair of first frame members, and the second frame member is provided below the first frame member and secondly.
An evaporative system for a motorcycle, characterized in that a canister is arranged on the rear side of the frame and on the side opposite to the muffler-mounted side.

[0021] According to the second aspect of the invention, in the evaporative system of the motorcycle, in which the evaporated gas in the fuel tank is sent to the canister through the breather pipe and the evaporated fuel pipe and is adsorbed to the canister, in front of the seat of the motorcycle. A third frame member for supporting the fuel tank at an upper portion thereof is provided, and a lower surface of the fuel tank facing the third frame member has a saddle shape and has a pair of left and right inner side surfaces, The fuel cock is fixed to the lower surface of the tank, the breather pipe is fixed in the fuel tank, and the lower end of the breather pipe projects downward from the inner side surface opposite to the muffler mounting side and from the rear of the fuel cock. A rollover valve is fixed to the inner surface and below the protruding portion of the lower end of the breather pipe,
In the evaporative system for a motorcycle, the lower end of the breather pipe and the rollover valve are connected by a pipe.

[0022]

According to the invention of claim 1, since the mounting position of the canister is on the side opposite to the muffler mounting side of the vehicle and at a place relatively distant from the engine, the canister is heated by the muffler or the engine. The influence can be avoided. Also, since the mounting position of the canister is below the seat rail and behind the side tube,
The canister can be accommodated in the frame cover, and the evaporation fuel pipe and the purge pipe can be relatively easily arranged.

According to the second aspect of the invention, the rollover valve is installed on the side opposite to the muffler mounting side, like the canister, so that it is not affected by heat from the muffler. Further, since the lower end of the breather pipe projects from the inner surface of the lower surface of the fuel tank opposite to the muffler mounting side, the evaporative fuel pipe connected to the lower end of the breather pipe can avoid the heat effect from the muffler. it can. Further, since the lower end of the breather pipe projects from the rear of the fuel cock attachment position on the lower surface of the fuel tank, the fuel hose and the evaporated fuel pipe are prevented from contacting each other, and the evaporated fuel pipe is the cylinder of the engine. It is not affected by heat from the department.

[0024]

Embodiments of the present invention will now be described in detail with reference to the drawings. The following examples are preferred embodiments of the present invention, and the technical scope of the present invention is not limited to these examples. A mounting structure for a canister of a motorcycle according to a first embodiment of the present invention will be described. FIG. 1 shows the overall construction of a motorcycle showing the first embodiment. FIG. 2 is a perspective view around the canister.

As shown in FIGS. 1 and 2, in the evaporative system of the motorcycle, the evaporative gas in the fuel tank 10 is sent to the canister 22 via the breather pipe 58 and the evaporative fuel pipe 36 and is adsorbed to the canister 22. The engine 6 is supported by the down tube 8 between the front wheel 4a and the rear wheel space 4b. Further, the fuel tank 10 is fixed to the tank rail 12 above the engine 6. A pair of left and right seat rails 16 are provided below the seat 14 disposed behind the fuel tank 10 to extend in the front-rear direction to support the seat 14.
a and 16b are provided. The set of seat rails 1
A pair of left and right side tubes 18a and 18b so as to extend forward and obliquely downward from the substantially central portions of 6a and 16b.
And a pair of seat rails 16a and 16b are provided.
Fixed to. Also, the seat rail 16a or 16b
A cylindrical canister 22 is provided below the side tube 18a or 18b and on the side opposite to the muffler 20 mounting side (in the first embodiment, the left side in the vehicle width direction).

The main frame 25 is welded to the rear end of the tank rail 12, extends rearward of the engine 6 from the tank rail 12, and is welded to the rear end of the down tube 8. Further, the motorcycle shown in FIG. 1 is provided with one rear suspension having a damper portion 24. This rear suspension mainly consists of the damper section 2
4, cushion lever 24a, cushion rod 24
b and a swing arm 24c. That is, the damper portion 24 has a substantially oblong cylindrical shape, and has a damper member in its axis for cushioning a shock, and an elastic member for making the lengths of the damper member and the damper portion constant even if a shock is applied,
The upper end is connected to the substantially upper end of the main frame 25, and the lower end extends to the front of the rear wheel 4b. The elastic member is arranged so as to surround the damper member.
A rear end of the cushion lever 24a is connected to a lower end of the damper portion 24, and a front end thereof is connected to a connecting portion between the down tube 8 and the main frame 25, and extends substantially horizontally and rearward. Cushion rod 24b
Is connected to a substantially central portion of the cushion lever 24a and extends obliquely upward and rearward. The swing arm 24c is connected to the cushion rod 24b at a substantially central portion thereof, the front end portion thereof is connected to the main frame 25 near the rear portion of the engine 6, and the swing arm 24c extends rearward to have the rear end portion of the rear wheel shaft 4b1. Connected with.

When the rear wheel 4b receives an impact from the ground, the rear wheel shaft 4b1 moves the swing arm 24c around the swing arm 24c and the main frame 25 as a fulcrum.
Rotate counterclockwise at. Then, the swing arm 24c rotates the cushion lever 24a counterclockwise via the cushion rod 24b. As a result, the damper portion 24 receives a compressive force in its axial direction. Therefore, the compression force is absorbed by the damper portion 24, and the shock received by the rear wheel 4b from the ground is buffered.

A carburetor 26 is connected to an intake hole 6a in the upper part and the rear part of the engine 6. The air cleaner 28 connected to the carburetor 26 is attached to the canister 22.
Is arranged in front of.

As shown in FIG. 2, in order to reinforce the connecting portion between the seat rail 16a and the side tube 18a, a hollow reinforcing member 30 having a substantially triangular shape is provided between the seat rail 16a and the side tube 18a around the connecting portion. It is welded. The canister 22 has the reinforcing member 30.
The plate 32 and the canister mounting bracket 3
It is attached via 4. That is, the upper portion of the plate 32 is welded to the reinforcing member 30, and the bracket 34 is screwed to the lower portion of the plate 32. The canister 22 is screwed to the lower surface of the bracket 34 with a screw member (bolt or the like) 49 via an elastic member (made of rubber or the like) 44 as described later in detail. Also, canister 2
An evaporative fuel pipe 36 and a purge pipe 38 are connected to the disk-shaped front surface of No. 2.

FIG. 3 is a sectional view taken along the line III--III in FIG. 1 and seen from the rear, and FIG. 4 is an exploded perspective view of the structure around the canister seen from the rear. As shown in FIGS. 3 to 4, the plate 32 is a rectangular flat plate and has a notch at the center of one long side. Further, the plate 32 has two through holes 32 a, 3 arranged in the long side direction.
2a is provided. In addition, the bracket 34 includes a rectangular first attachment piece portion 34a and a first attachment piece portion 3 from one long side of the first attachment piece portion 34a.
Rectangular flat plate portion 34 extending in a direction perpendicular to 4a
b and a second side that extends from the long side of the flat plate portion 34b opposite to the first mounting piece portion 34a, and that bends slightly in a direction opposite to the direction in which the flat plate portion 34b bends with respect to the first mounting piece portion 34a. And a mounting piece portion 34c.

Further, the bracket 34 has two through holes 34a arranged in the long side direction on the first mounting piece 34a.
1, 34a1, a through hole 34b1 provided in the flat plate portion 34b at a position slightly displaced from the central portion in the long side direction, and slightly opposite to the through hole from the central portion of the second mounting piece portion 34c. Through hole 34c1 provided at a position displaced in the long side direction of the direction. The bracket 34 may be made by bending by pressing, or may be made by joining three rectangular plate members by welding or the like.

When attaching the bracket 34 to the plate 32, the screw member 40 is attached to the bracket 34.
It is inserted into the through hole 34a1 of the attachment piece portion 34a and the through hole 32a of the plate 32, and is screwed to the nut 42.

Next, attachment of the canister 22 to the bracket 34 will be described. 3 to 4,
The elastic member 44 is, for example, so-called H rubber, and has a hole in the center thereof through which the screw portion of the screw member 49 can pass. The through holes 34b1 and 34c1 of the bracket 34 on the curved surface of the cylindrical canister 22.
The stay 46 is welded to a position corresponding to. The stay 46 is a substantially U-shaped plate member that opens downward, and has a through hole 46a on the upper surface through which the screw portion of the screw member 49 can pass. A welding nut 48 is fixed to the inner lower surface of the stay 46.

When the canister 22 is attached to the bracket 34, the central cylindrical portion of the elastic member 44 is inserted through the through holes 34b1 and 34c1 of the bracket 34, and the screw member 49 is attached to the central hole of the elastic member 44 and the stay. It is inserted into the through hole 46 a of the screw 46 and is screwed to the welding nut 48. A disk-shaped washer 50 is interposed between the screw member 49 and the elastic member 44 for screwing.

According to the first embodiment, as shown in FIG. 1, the mounting position of the canister 22 is on the side opposite to the muffler 20 mounting side of the vehicle, and at a place relatively far from the engine 6. So the canister 22 is the muffler 2
It is possible to avoid the influence of heat from 0 or the engine 6. Further, since the mounting position of the canister 22 is below the seat rail 16a and behind the side tube 18a, the canister 22 can be housed inside the frame cover 52 as shown in FIG. Also, the piping of the purge pipe 38 becomes relatively easy.

Next, the second embodiment will be described. The second embodiment is a mounting structure for a rollover valve of a motorcycle. FIG. 5 is a side view of the fuel tank to which the rollover valve is attached, and FIG. 6 is a plan view of the same.
Further, the muffler in the second embodiment is mounted on the right side in the vehicle width direction as shown in FIG. 1 (overall configuration of the motorcycle of the first embodiment) as in the first embodiment. Also,
The structure around the fuel tank of the second embodiment is the structure shown in FIG. 1 as in the first embodiment.

As shown in FIGS. 1, 5, and 6, the motorcycle in which the vaporized gas in the fuel tank 10 is sent to the canister 22 through the breather pipe 58 and the vaporized fuel pipe 36 and is adsorbed to the canister 22. In the evaporative system, the fuel tank 1 is placed in front of the seat 14 of the motorcycle.
A tank rail 12 that supports 0 on its top is provided. Lower surface 5 of the fuel tank 10 facing the tank rail 12
4 has a substantially saddle shape and has a pair of left and right inner side surfaces 54a and 54b. A fuel cock 56 is fixed to the lower surface 54. The breather pipe 58 is fixed in the fuel tank 10, and the lower end portion 58a of the breather pipe 58 is located above the inner surface 54a on the side opposite to the muffler 20 mounting side (in the second embodiment, the left side in the vehicle width direction). And projecting downward from the rear of the fuel cock 56, the inner side surface 54a, and the breather pipe 58.
A rollover valve 60 is fixed below the projecting portion of the lower end portion 58a, and the lower end portion 58a of the breather pipe 58 and the rollover valve 60 are connected by an evaporated fuel pipe 62.

An evaporated fuel pipe 36 connects the rollover valve 60 and the canister 22. Also,
The fuel cock 56 is attached to the inner surface 54 by the fuel cock attachment plate indicated by reference numeral 56a in FIG.
It is fixed to a. Further, the fuel hose 56b is connected to the fuel cock 56.

FIG. 7 is a sectional view taken along the line VII--VII in FIG. 5 and seen from the rear, and FIG. 8 is an exploded perspective view of the rollover valve and its surroundings. As shown in FIGS. 7 to 8, the rollover valve 60 includes a cylindrical portion 60a.
A pair of disc portions 60b and 60b fixed to both ends of the cylindrical portion 60a, and a pair of connecting pipes 60c and 60c fixed vertically to the central portion of the pair of discs 60b and 60b.
have. The rollover valve 60 is fixed to the inner surface 54 a of the fuel tank 10 via a plate 63, a bracket 64, and a fixture 66. Also,
The plate 63 is made of a rectangular plate material. The rollover valve mounting bracket 64 includes a rectangular flat plate portion 64a and both end portions on the short side of the flat plate portion 64a.
A plate-shaped 1 which is bent and extended at a right angle to the flat plate portion 64a
A pair of legs 64b, 64b and the pair of legs 64b, 64
A set of mounting piece portions 64 bent and extended from the end portion of b in parallel with the flat plate portion 60a and in directions opposite to each other.
c, 64c. In addition, the flat plate portion 6 of the bracket 64
A through hole 64d is provided in the plate 4a at a position slightly displaced from the central portion of the flat plate portion 64a in the long side direction. Fixture 66
Is made of a plate material having a semicircular curved surface portion 66a at its end. Further, the fixture 66 is provided with a through hole 66b near the end opposite to the curved surface portion 66a.

The rollover valve 60 is attached to the left inner surface 54a of the lower surface 54 of the fuel tank 10 in the vehicle width direction as follows. First, plate 6
3 is fixed to the inner surface 54a by welding or the like, and the mounting piece 64c of the bracket 64 is further fixed to the plate 63. With the curved surface portion 66a of the fixture 66 fitted in the cylindrical portion 60a of the rollover valve 60, the rollover valve 60 is pressed against the flat plate portion 64a of the bracket 64, and the screw member 68 is inserted into the through hole 66b of the fixture 66, and The welding nut 70 fixed to the flat plate portion 64a of the bracket 64 by being inserted into the through hole 64d of the bracket 64.
Screw on. According to the second embodiment, as shown in FIG. 6, the rollover valve 60 is opposite to the muffler 20 mounting side (in the case of the second embodiment, the left side in the vehicle width direction).
Since it is installed in the muffler 20, it is not affected by heat from the muffler 20.

Further, as shown in FIG. 6, since the lower end portion 58a of the breather pipe 58 projects from the inner side surface 54a of the lower surface 54 of the fuel tank 10 opposite to the muffler 20 mounting side, the lower end of the breather pipe 58. The evaporated fuel pipe 62 connected to the portion 58a can avoid the influence of heat from the muffler 20. Also, as shown in FIG.
The lower end portion 58a of the breather pipe 58 is attached to the fuel tank 10.
Since it projects from the rear side of the lower surface 54 of the fuel cock 56 from the mounting position, the fuel hose 56b and the evaporated fuel pipe 36 are prevented from coming into contact with each other, and the evaporated fuel pipe 36 prevents heat from the cylinder portion of the engine. I will not receive it.

[0042]

According to the present invention, the evaporative system, that is, the canister, the rollover valve, and other piping are not affected by heat from the engine or the muffler. Further, according to the present invention, pipe distribution work in the evaporation system is facilitated.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a motorcycle according to first and second embodiments of the present invention.

FIG. 2 is a perspective view showing a mounting structure of the canister of the first embodiment.

FIG. 3 is a cross-sectional view showing a mounting structure of a canister taken along a line III-III in FIG. 1 and seen from the rear side.

FIG. 4 is an exploded perspective view showing the mounting structure of the canister of the first embodiment.

FIG. 5 is a side view of a fuel tank to which a rollover valve of the second embodiment is attached.

FIG. 6 is a plan view of a fuel tank equipped with a rollover valve according to a second embodiment.

FIG. 7 is a cross-sectional view showing the mounting structure of the rollover valve as seen from the rear, taken along the line VII-VII in FIG.

FIG. 8 is an exploded perspective view showing a mounting structure for a rollover valve according to a second embodiment.

FIG. 9 is a first conventional technology (canister mounting structure).
1 is an overall configuration diagram of a motorcycle according to FIG.

FIG. 10 is a side view showing an example of a fuel tank to which a breather pipe according to a second conventional technology (rollover valve mounting structure) is mounted.

FIG. 11 is a plan view showing an example of a fuel tank to which a breather pipe according to a second conventional technique is attached.

FIG. 12 is a perspective view of a frame of a motorcycle having one tank rail.

FIG. 13A is a side view showing another example of the fuel tank to which the breather pipe according to the second conventional technique is attached. (B) is the same top view.

FIG. 14 is a side view showing still another example of the fuel tank to which the breather pipe according to the second related art is attached.

[Explanation of symbols]

 10 Fuel Tank 12 Tank Rail 14 Seat 16a and 16b Seat Rail 18a and 18b Side Tube 20 Muffler 22 Canister 54 Fuel Tank Bottom Surface 54a and 54b Left and Right Inner Sides 56 Fuel Cock 58 Breather Pipe 58a Breather Pipe Lower End 60 Roll Over valve 62 Evaporative fuel pipe

Claims (2)

[Claims] 1. An evaporative system for a motorcycle, in which vaporized gas in a fuel tank is sent to a canister via a breather pipe and a vaporized fuel pipe, and is adsorbed to the canister. A pair of left and right first frame members for supporting the first frame member, and a pair of left and right second frame members extending forward and obliquely downward from a substantially central portion of the first frame member of the one set. An evaporative system for a motorcycle, comprising a canister fixed to the first frame member, below the first frame member, behind the second frame, and on the side opposite to the muffler mounting side. 2. An evaporative system for a motorcycle, in which vaporized gas in a fuel tank is sent to a canister via a breather pipe and a vaporized fuel pipe to be adsorbed to the canister, in which a fuel tank is provided in front of a seat of the motorcycle and above the seat. A third frame member for supporting the fuel tank is disposed, and a lower surface of the fuel tank facing the third frame member has a substantially saddle shape and has a pair of left and right inner side surfaces, and a fuel cock is provided on the lower surface of the fuel tank. The breather pipe is fixed and the breather pipe is fixed in the fuel tank, and the lower end portion of the breather pipe protrudes downward from the upper portion of the inner side surface opposite to the muffler mounting side and the rear of the fuel cock, and the inner side surface, and A rollover valve is fixed below the protruding portion of the lower end of the breather pipe, and the lower end of the breather pipe and the roller are fixed. The evaporative system for motorcycles is characterized in that the loopover valve is connected by a pipe.