JP5147621B2 - Motorcycle - Google Patents

Description

  The present invention relates to an improvement in a motorcycle including a gas-liquid separator that prevents liquid fuel from flowing into a canister.

A fuel tank and a gas-liquid separator provided in the fuel tank and above the oil level of the fuel to separate the fuel into evaporated fuel and liquid fuel and prevent the liquid fuel from flowing into the canister are provided. A motorcycle is known (for example, refer to Patent Document 1).
JP 57-60981 A (FIG. 2)

  In FIG. 2 of Patent Document 1, a fuel supply pipe 13 is extended from the fuel supply port of the fuel tank 10 (the reference numeral is the same as that of the same publication; the same applies hereinafter) toward the inside of the fuel tank 10. A separator 11 (hereinafter referred to as “gas-liquid separator 11”) that guides the evaporated fuel evaporated in the fuel tank 10 to the canister is disposed on the front upper surface of the handle. The gas-liquid separator 11 is provided with a valve mechanism 22 in which a fuel overfill prevention valve 21 for preventing liquid fuel from flowing out into the canister when the vehicle body is largely inclined is incorporated in two stages.

  However, in the technique of Patent Document 1, it is necessary to provide the front end opening 27 for communicating the gas-liquid separator 11 and the fuel tank 10 on the upper surface of the fuel tank 10, so that it is difficult to make the upper portion of the fuel tank 10 compact. It was.

  An object of the present invention is to provide a technique capable of downsizing a gas-liquid separator in a motorcycle including a gas-liquid separator that separates fuel into gas and liquid.

The invention according to claim 1 is a fuel tank that stores fuel, a gas-liquid separator that is provided above the oil level of the fuel and separates the fuel into evaporated fuel and liquid fuel, and a fuel tank that is provided in the gas-liquid separator. An introduction opening for introducing the evaporated fuel into the gas-liquid separator, a return opening for returning the liquid fuel in the gas-liquid separator to the fuel tank, a discharge pipe extending from the gas-liquid separator and guiding the evaporated fuel, and In a motorcycle equipped with a canister provided at the tip and adsorbing evaporated fuel, after extending from the gas-liquid separator in the vehicle width direction of the fuel tank, it is folded back in the vehicle width direction and bent outward in the vehicle width direction parts are arranged two folded pipes so as to be positioned, shaped with connecting one end of each of two folded pipe to a gas-liquid separator, the introduction opening at the other end 2, these two introduction openings arranged respectively in the vehicle width direction end portion side of the fuel tank, the folded pipe is formed two in a substantially U-shaped, having when viewed from above the vehicle, the introduction opening When the vehicle body is tilted to the left or right, the liquid fuel flows in from the introduction opening of the other folded pipe, and the evaporated fuel flows out of the folded pipe. After flowing into the gas-liquid separator from the inlet opening of one of the folded pipes, the liquid fuel flows into the outlet pipe, and when the vehicle body is tilted to the other side, the liquid fuel is introduced into the folded pipe. The evaporated fuel flows into the gas-liquid separator from the inlet opening of the other folded pipe, and then flows into the discharge pipe. When the vehicle body returns to the horizontal position, the evaporated fuel After flowing into the gas-liquid separator from the folded pipe on the side not immersed in the oil surface, the liquid fuel that flows into the discharge pipe and into one folded pipe, the other folded pipe or the gas-liquid separator is returned to the return opening. It is characterized in that it returns to the fuel tank from the introduction opening that also serves as a fuel cell .

The invention according to claim 2 is characterized in that the folded pipe is connected to the lowermost part of the gas-liquid separator at the pipe connecting portion, and the introduction opening is arranged below the pipe connecting portion.

In the invention according to claim 3 , a fuel filler is provided at the uppermost part of the fuel tank and substantially at the center, and a fuel filler pipe formed in a cylindrical shape is extended from the fuel filler into the fuel tank. It is arranged above the lower surface of the oil supply pipe.

In the invention according to claim 4 , the fuel tank includes an upper half and a lower half, and a stay and a discharge pipe for attaching the gas-liquid separator to the fuel tank are attached to the lower half. .

  In the invention according to claim 1, since the gas-liquid separator according to the present invention is disposed inside the fuel tank, it can be made compact in the vehicle width direction as a liquid fuel outflow prevention mechanism, and the upper portion of the fuel tank. It is possible to reduce the size in the height direction through downsizing.

  In addition, two folded pipes that extend in the vehicle width direction of the fuel tank from the gas-liquid separator and then folded back in the vehicle width direction are arranged inside the fuel tank, and one end of each of the two folded pipes is connected to the gas liquid. While connecting to the separator, the other end is formed with an introduction opening, and these two introduction openings are respectively arranged at both ends in the vehicle width direction of the fuel tank, so that only evaporated fuel is used without using a member such as a check valve. Can be guided to the gas-liquid separator, the number of parts can be reduced, and the gas-liquid separator can be configured with a simple configuration. Further, even when the vehicle is inclined, the introduction opening on one side is arranged so as to face the gas portion in the fuel tank, so that the evaporated fuel in the fuel tank can always be guided to the gas-liquid separator. .

Further , the two introduction pipe straight portions having the introduction openings are arranged so as to overlap each other. If the overlapping portions can be collectively fixed to another member provided on the fuel tank side, the folded pipe can be easily and firmly fixed to the fuel tank side.

  If the return pipe is firmly fixed, the introduction opening can be made difficult to move, and if the introduction opening becomes difficult to move, the introduction opening becomes difficult to contact the oil level due to vibration during traveling, etc. It can be further enhanced.

In the invention according to claim 2 , the folded pipe is connected to the lowermost part of the gas-liquid separator at the pipe connecting portion, and the introduction opening is disposed below the pipe connecting portion.
Fuel entered the gas-liquid separator, and the accumulated fuel was connected to the lowermost part of the gas-liquid separator as the gas-liquid separator was tilted and returned to the horizontal position, and was placed below the pipe connection. It passes through the folded pipe having the introduction opening and flows out from the introduction opening into the fuel tank.

  Thus, since the return pipe also serves as a pipe for returning from the gas-liquid separator to the fuel tank, it is not necessary to newly provide a return pipe and the structure of the gas-liquid separator can be simplified.

In the invention according to claim 3 , since the introduction opening is disposed above the lower surface of the fuel supply pipe, it is possible to effectively utilize the dead space of the fuel tank and suppress the inflow of liquid fuel to the gas-liquid separator.

In the invention according to claim 4 , since the stay and the exhaust pipe for attaching the gas-liquid separator to the fuel tank are attached to the lower half of the fuel tank, before assembling the upper half with the lower half, A stay and a discharge pipe can be attached to the lower half. Accordingly, productivity related to assembly of the stay and the discharge pipe is improved.

The best mode for carrying out 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 left side view of a motorcycle according to the present invention. A motorcycle 10 includes a body frame 11 and a drive unit 13 including an engine 12 suspended on the body frame 11.

  The vehicle body frame 11 includes a head pipe 15, a main frame 19 and a down frame 20 that extend rearward and downward from the head pipe 15, and an upper frame that extends rearward from the rear portion of the main frame 19. Seat rails 22L and 22R (only the left side reference numeral 22L is shown), a pivot plate 18 attached to the rear lower part of the main frame 19 and suspending the engine 12, and a seat rail 22L extending rearward and upward from the pivot plate 18 The sub-frames 23L and 23R (only the left reference numeral 23L is shown) supporting 22R.

  A steering unit that enables the vehicle to be steered is configured by a front fork 25 that is provided obliquely forward and downward from the head pipe 15 and supports the front wheel 24, and a steering handle 26 that is attached to the upper end of the front fork 25. .

  The rear wheel suspension portion includes a rear swing arm 36 (swing arm 36) that supports the rear wheel 35, and rear cushion units 37, 37 (front side) mounted between the swing arm 36 and the seat rails 22L, 22R. Only the reference numeral 37 is shown.).

  That is, the rear wheel suspension portion constitutes the rear portion of the vehicle body frame 11, and is supported on the vehicle body frame 11 through the pivot shaft 38 so as to be swingable and rotatably supports the rear wheel 35 as a wheel at the tip. A swing arm 36 is provided.

  A fuel tank 41 for storing fuel is attached to the main frame 19 and above the engine 12 so as to straddle the main frame 19. Below the fuel tank 41, a canister 44 for storing the evaporated fuel evaporated in the fuel tank 41 is provided.

  Since the fuel tank 41 is disposed above the canister 44, the length of the discharge pipe 75 that connects the fuel tank 41 and the canister 44 and guides the evaporated fuel to the canister 44 can be shortened. If the length of the discharge pipe 75 can be shortened, the vehicle can be reduced in weight and size. The configuration of the evaporated fuel processing apparatus including the canister 44 will be described later.

The engine 12 is a drive source in which a transmission is integrally provided at the rear, a cylinder block 47 is attached to the crankcase 46, and a cylinder head 48 is attached to the cylinder block 47.
An intake device 51 is attached to the rear portion of the cylinder head 48, and an exhaust pipe 49, which is a component of the exhaust device 52, is attached to the front portion of the cylinder head 48.

  The intake device 51 includes a carburetor 56 connected to the cylinder head 48 via an intake pipe 53, and an air cleaner 58 connected to the carburetor 56 via a connecting tube 55. A device 60 is connected.

  The exhaust device 52 includes an exhaust pipe 49 that extends from the cylinder head 48 of the engine 12 and guides exhaust gas discharged from the engine 12, and a silencer 62 that is connected to the rear end of the exhaust pipe 49.

  Here, 66 is a front fender, 67 is a tail lamp, 68 is a rear fender, 69 is an occupant seat, 71 is a grab rail, 72 is a headlight, and 73 is an instrument box including a speedometer.

FIG. 2 is a side view showing an evaporative fuel processing apparatus provided in the motorcycle according to the present invention. The fuel in the fuel tank 41 is evaporated between the fuel tank 41 storing the fuel and the carburetor 56. The evaporated fuel processing device 60 is connected to suck the evaporated fuel into the carburetor 56 of the intake device 51.

Evaporative fuel processing system 60 is a system for burning a component of the evaporated fuel present in the fuel tank 41 HC (the hydrocarbon) sucks fuel mixture to the intake system by negative intake pressure of the engine, a fuel tank 41 A gas-liquid separator 74 provided at an upper portion of the gas separator for separating the fuel into evaporative fuel and liquid fuel; a discharge pipe 75 having one end connected to the gas-liquid separator 74; and one end connected to the other end of the discharge pipe 75 The canister 44 that adsorbs the evaporated fuel, a first purge pipe 77 having one end connected to the canister 44, a purge control valve 78 connected to the other end of the first purge pipe 77, and the purge control valve 78 One end is connected to the carburetor 56, and the other end is connected to the side of the carburetor body 57 constituting the carburetor 56. A canister air cleaner 81 for purifying fresh air introduced into the nister 44, a fresh air introduction pipe 82 connecting each of the canister air cleaner 81 and the canister 44, and the canister 44 for communicating with the outside of the canister 44. And an external communication pipe 83 having a lower end opened to the atmosphere. An oil supply cap 84 covers the oil supply port.

The gas-liquid separator 74 described above enables the evaporative fuel to be discharged through the discharge pipe 75 even when the fuel is supplied to the upper limit in the fuel tank 41 (so-called full tank).

The canister 44 is a container filled with activated carbon that temporarily adsorbs evaporated fuel.
The first purge pipe 77 and the second purge pipe 79 are components constituting the purge pipe 80, and the purge control valve 78 described above is provided in the middle of the purge pipe 80 so that the valve opening direction is the vertical direction of the vehicle. Is provided.

The purge control valve 78 is a one-way valve that controls the intake amount of the evaporated fuel in order to prevent a large amount of evaporated fuel from being sucked into the carburetor 56 at once and the air-fuel ratio of the air-fuel mixture to fluctuate greatly. When the negative pressure is applied, the flow of evaporated fuel from the canister 44 to the carburetor 56 is allowed, and the flow of gas from the carburetor 56 to the canister 44 is prevented.
The canister air cleaner 81 is provided separately from the air cleaner 58.

Next, the operation of the evaporated fuel processing apparatus described above will be described.
The evaporated fuel that has flowed into the canister 44 is once adsorbed by the activated carbon. When the intake negative pressure of the intake system acts on the canister 44, the vaporized fuel is released from the activated carbon and sucked into the carburetor 56 by the fresh air introduced into the canister 44 through the fresh air introduction pipe 82. .

  FIG. 3 is a side view (partially sectional view) of a fuel tank provided in the motorcycle according to the present invention, and FIG. 4 illustrates that a gas-liquid separator and a discharge pipe are attached to the lower half of the fuel tank. FIG. Hereinafter, description will be made with reference to FIGS.

The fuel tank 41 is a member that is disposed at the front portion of the main frame (reference numeral 19 in FIG. 1) and is attached so as to straddle it.
The gas-liquid separator 74 described above is provided above the fuel tank 41, a discharge pipe 75 is extended from the gas-liquid separator 74, and the downstream end of the discharge pipe 75 is provided below the fuel tank 41. By connecting to the canister (reference numeral 44 in FIG. 1), the evaporated fuel evaporated in the fuel tank 41 can flow to the canister 44 and be adsorbed.

The fuel tank 41 is a container including a lower half body 111 and an upper half body 112 that covers the lower half body 111. Further, the fuel tank 41 includes a bottom surface 131 of the lower half body 111, left and right walls 132 and 133 which are constituent elements of the upper half body 28 and are opposed to the left and right, and front and rear walls 134 and 135 which are arranged to face the front and rear. And a flange surface 136 that is provided on the lower half 111 and bent downward as a mating surface with the upper half 28.
The gas-liquid separator 74 is attached to the center of the width direction in the vicinity of the fuel filler opening of the fuel tank 41 via a stay 127.

  The gas-liquid separator 74 extends from the gas-liquid separator 74 with a discharge pipe 75 that guides the evaporated fuel to the canister 44. Reference numerals 138 a to 138 c denote discharge pipe stays that are attached to the bottom surface 132 and stop the discharge pipe 75.

Since the stay 127 and the discharge pipe 75 for attaching the gas-liquid separator 74 to the fuel tank 41 are attached to the lower half 111 provided in the fuel tank 41, the stay 127 and the gas-liquid separator are attached to the lower half 111 in advance. After attaching 74 and the discharge tube 75, the upper half 112 can be assembled to the lower half 111. Therefore, the productivity related to the assembly of the stay and the discharge pipe can be increased. That is, by attaching the gas-liquid separator 74 or the like to the lower half 29, it is possible to ensure good assembly of the gas-liquid separator 74 to the fuel tank 41 .

An oil supply pipe 114 formed in a cylindrical shape extends downward from an oil supply port 113 provided on the upper surface of the upper half 112.
Since the oil supply pipe 114 extends below the oil supply port 113, there is no escape space for the air remaining above the lower surface 114u of the oil supply pipe when fuel is supplied, and the fuel exceeds the level of the lower surface 114u of the oil supply pipe. The oil level Y can be prevented from reaching.

That is, the gas-liquid separator 74 is disposed inside the fuel tank 41 , and the gas-liquid separator 74 is disposed above the lower surface 114u of the fuel supply pipe.
Hereinafter, the details of the gas-liquid separator will be described.

5 is a cross-sectional view taken along line 5-5 of FIG. 4 and will be described with reference to FIG.
A gas-liquid separator 74 disposed inside the fuel tank 41 includes a container body 143 including an upper convex half body 141 and a lower convex half body 142 abutted against the upper convex half body 141 from below, and the container body 143. Pipe connection portions 145 and 146 opened in the lower convex half 142, and left and right folded portions arranged so as to exhibit a substantially U shape when viewed from above with one end inserted into these pipe connection portions 145 and 146 Pipes 147 and 148, a holding plate 149 that is attached to the container body 143 and surrounds the container body 143 and stops the middle portion of the left and right folded pipes 147 and 148, and an opening 126 that is opened in the center in the width direction of the lower convex half 142. And a discharge pipe 75 for guiding the fuel vapor to the canister 44 by inserting the upper end 75t upward from the lower side to a position close to the upper convex half 141. Both the container body 143 and the holding plate 149 are attached to the stay 127. The discharge pipe 75 is a member extending from the gas-liquid separator 74.

  The left folded pipe 147 is disposed close to the right wall 133 so as to introduce the evaporated fuel in the fuel tank 41 into the gas-liquid separator 74, and liquid fuel in the gas-liquid separator 74 to the fuel tank 41. The left introduction opening 163 that also serves as the return opening and constitutes the other end 147a of the folded pipe 147, the left introduction pipe straight portion 153 extending in the width direction from the left introduction opening 163 to the vicinity of the left wall 132, and the introduction A left bent portion 155 that is provided at the end of the straight tube portion 153 and changes its direction by 180 °, and a vessel wall portion 143R that is inserted from the bent portion 155 into the pipe connecting portion 145 provided in the container body 143 and is opposed to one end 147t. It is inserted to the vicinity of.

In the present embodiment, two folded pipes are provided on the left and right, but three or more may be provided.
The configuration of the right folded pipe 148 is not different from the left folded pipe 147 except that the mounting directions are different on the left and right, and the description thereof is omitted.

  Referring also to FIG. 3, the folded pipes 147 and 148 are connected to the lowermost part 161 of the gas-liquid separator at the pipe connecting portions 145 and 146, and in the direction of the arrow d1 with the pipe connecting portions 145 and 146 as axes. The introduction openings 163 and 164 are respectively disposed below the pipe connection portions 145 and 146 by being inclined downward at a predetermined angle.

  The fuel that has entered and accumulated inside the gas-liquid separator 74 is connected to the lowermost part of the gas-liquid separator 74 as the gas-liquid separator 74 disappears and approaches a horizontal posture, and is more than the pipe connection portions 145 and 146. It can return to the fuel tank 41 from the introduction openings 163 and 164 through the return pipes 147 and 148 having the introduction openings 163 and 164 disposed below.

  Thus, since the return pipes 147 and 148 also serve as return pipes for returning from the gas-liquid separator 74 to the fuel tank 41, it is not necessary to newly provide return pipes and the structure of the gas-liquid separator 74 can be simplified. can do.

A fuel filler port 113 is provided at the uppermost portion of the fuel tank 41 and substantially at the center, and a fuel filler pipe 114 formed into a cylindrical shape is extended from the fuel filler port 113 into the fuel tank 41. It is disposed above the lower surface 114u of the oil supply pipe.
Since the introduction openings 163 and 164 are disposed above the lower surface 114u of the fuel supply pipe, the dead space of the fuel tank 41 can be effectively used and the inflow of liquid fuel into the gas-liquid separator 74 can be suppressed.

FIG. 6 is a view taken along arrow 6 in FIG. 4 and will be described with reference to FIG.
Gas-liquid separator 74 is attached by the stay 127 in the fuel tank 41, the stay 127 is attached to the substantial center in a transverse direction of the lower half body 29 of a fuel tank 41.

Gas-liquid separator 74 is attached by the stay 127 in the fuel tank 41, the stay 127, so attached to the substantial center in a transverse direction of the bottom surface 131 of the fuel tank 41, is possible to shorten the length of the stay 127 It is possible to achieve both weight reduction and rigidity securing of the mounting portion.

7 is a sectional view taken along line 7-7 in FIG. 4, and FIG. 8 is a sectional view taken along line 8-8 in FIG. Hereinafter, description will be made with reference to FIG. 4 and FIGS.
Two folded pipes 147 and 148 are formed in a substantially U shape, and the two introduction pipe straight portions 153 and 154 having introduction openings 163 and 164 are arranged so as to overlap when the vehicle is viewed from above. Yes. A holding plate 149 is disposed between the two introduction pipe straight portions 153 and 154, and the two introduction pipe straight portions 153 and 154 are stopped on the holding plate 149.
In the figure, reference numerals 171 to 173 denote welds as stoppers.

  Since the two introduction pipe straight portions 153 and 154 are fixed to the upper surface 149t and / or the lower surface 149u of the holding plate 149, the return pipes 147 and 148 are connected to the fuel tank by using the introduction pipe straight portions 153 and 154. It can be easily fixed to the 41 side. If the overlapping portion can be fixed to the holding plate 149 as another member, the folded pipes 147 and 148 can be easily and firmly fixed to the fuel tank 41 side.

  If the return pipes 147 and 148 are firmly fixed, the introduction openings 163 and 164 can be made difficult to move, and if the introduction openings 163 and 164 become difficult to move, the introduction openings 163 and 164 become oily due to vibration during traveling. It becomes difficult to contact the surface, and the gas-liquid separation function of the gas-liquid separator 74 can be further enhanced.

  In this embodiment, the means for stopping the folded pipes 147 and 148 on the holding plate 149 is based on welding stop, but an adhesive or the like may be used.

In FIG. 7, the holding plate 149 is inclined downward with respect to the horizontal plane, and the introduction openings 163 and 164 provided in the folded pipes 147 and 148 held by the holding plate 149 are connected to the pipe connecting portion 145, It is arranged lower than 146 by L1.
Since the introduction openings 163 and 164 are disposed L1 below the pipe connecting portions 145 and 146, the liquid fuel remaining in the folded pipes 147 and 148 when the vehicle returns from the inclined posture to the horizontal posture. Can be easily returned to the fuel tank 41.

The operation of the gas-liquid separator described above will be described next.
FIG. 9 is a diagram for explaining the operation of the gas-liquid separator provided in the motorcycle according to the present invention.
(A) shows a state in which the vehicle body is tilted to the left and a part of the gas-liquid separator 74 is immersed in the oil level Y. The liquid fuel is provided in the right turn pipe 148 and is disposed opposite to the left wall 132. From the right introduction opening 164, it flows into the left folded pipe 148 as indicated by an arrow a1, and flows into the gas-liquid separator 74 as indicated by an arrow a2. The liquid fuel that has flowed into the gas-liquid separator 74 accumulates at the bottom of the container body 143.

In this case, the evaporated fuel flows into the gas-liquid separator 74 from the left introduction opening 163, and the evaporated fuel that has flowed into the gas-liquid separator 74 flows into the discharge pipe 75 from the upper end 75t of the discharge pipe. Even when is inclined to the left, the evaporated fuel in the fuel tank 41 can be guided to the canister (reference numeral 92 in FIG. 3), and the evaporated fuel can be processed.

(B) shows a state in which the vehicle body returns horizontally from the state of (a) and is separated from the gas-liquid separator 74 from the oil level Y. The liquid fuel flowing into the gas-liquid separator 74 is shown in FIG. Thus, the container body 143 returns to the right turn pipe 148 and returns to the fuel tank 41 from the left introduction opening 164 that also serves as a return opening as shown in b2.

In this case, the evaporated fuel flows into the gas-liquid separator 74 from the introduction openings 163 and 164, the evaporated fuel flowing into the gas-liquid separator 74 flows into the discharge pipe 75 from the upper end 75t, and the liquid fuel flows into the canister 44. Will not flow into
Since the left and right folded pipes are arranged substantially symmetrically with respect to the center line in the width direction of the vehicle, the action when the vehicle body is tilted to the right side is the same as the above action, and the description thereof is omitted.

  That is, when the vehicle is tilted, the introduction opening provided on either one of the introduction openings 163 and 164 provided on the left and right is located above the oil level Y of the fuel. The introduction opening on one side of 164 is in contact with the evaporated fuel filled above the oil level Y. Since one introduction opening is in contact with the evaporated fuel, the evaporated fuel can be always guided to the gas-liquid separator 74.

Therefore, with the gas-liquid separator 74 having the structure according to the present invention, it is possible to take outside air into the fuel tank 41 without the liquid fuel flowing out from the fuel tank 41.
If the liquid fuel enters the return pipe from the introduction openings 163 and 164, the liquid fuel is returned to the fuel tank 41 before reaching the gas-liquid separator 74 when the vehicle tilts in the reverse direction. Become.

For this reason, it is possible to guide only the evaporated fuel to the gas-liquid separator 74 without using a member such as a check valve, thereby reducing the number of parts and configuring the gas-liquid separator 74 with a simple configuration. Further, even when the vehicle is inclined, the introduction opening on one side is arranged so as to face the gas portion in the fuel tank, so that the evaporated fuel in the fuel tank can always be guided to the gas-liquid separator 74. .
Since the gas-liquid separator 74 according to the present invention is arranged inside the fuel tank 41, it is possible to make the vehicle width direction compact, and also to make it compact in the height direction by making the upper part of the fuel tank 41 compact. be able to.

  FIG. 10 is a diagram showing another embodiment of FIG. 5. The difference from FIG. 5 is that the folded pipes 147 and 148 are connected to the lowermost part 161 of the gas-liquid separator at the pipe connecting portions 145 and 146. The connection portions 145 and 146 are used as axes and are inclined downward at a predetermined angle in the directions of arrows d2 and d2, respectively. Specifically, the introduction openings 163 and 164 are disposed below the pipe connection portions 145 and 146 by L3, respectively. There are no other significant differences. In this way, by bending the folded pipes 147 and 148 extending outward in the width direction left and right with the pipe connection parts 145 and 146 as axes, the introduction openings 163 and 164 are respectively connected to the pipe connection parts 145 and 146. Can also be arranged below.

  Since the introduction openings 163 and 164 are disposed below the pipe connecting portions 145 and 146, when the vehicle returns from the inclined posture to the horizontal posture, the liquid fuel remaining in the folded pipes 147 and 148 is used as fuel. It can be made easy to return to the tank 41.

  Although the present invention is applied to a motorcycle in the embodiment, it can be applied to a saddle-ride type vehicle.

  The present invention is suitable for a motorcycle including a gas-liquid separator that prevents liquid fuel from flowing out to a canister.

1 is a left side view of a motorcycle according to the present invention. 1 is a side view showing an evaporative fuel processing device provided in a motorcycle according to the present invention. 1 is a side view (partially sectional view) of a fuel tank provided in a motorcycle according to the present invention. It is a top view explaining that the gas-liquid separator and the discharge pipe are attached to the lower half of the fuel tank. FIG. 5 is a sectional view taken along line 5-5 of FIG. FIG. 6 is a view taken in the direction of arrow 6 in FIG. 4. FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. 4. FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 4. FIG. 6 is an operation explanatory diagram of a gas-liquid separator provided in the motorcycle according to the present invention. It is another Example figure of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Motorcycle, 41 ... Fuel tank, 44 ... Canister, 74 ... Gas-liquid separator, 75 ... Discharge pipe, 111 ... Upper half body, 112 ... Lower half body, 113 ... Refueling port, 114 ... Refueling pipe, 114u ... Refueling Lower surface of pipe, 127 ... stay, 132 ... left wall of fuel tank, 133 ... right wall of fuel tank, 145 ... pipe connection part (left), 146 ... pipe connection part (right), 147 ... folded pipe (left), 147t ... one end of the folded pipe (left), 147a ... the other end of the folded pipe (left), 148 ... the folded pipe (right), 148t ... one end of the folded pipe (right), 148a ... the other end of the folded pipe (right), 153... Straight pipe portion (left), 154... Straight pipe portion (right), 163.

Claims (4)

A fuel tank (41) for storing fuel, a gas-liquid separator (74) provided above the oil level of the fuel and separating the fuel into evaporated fuel and liquid fuel, and provided in the gas-liquid separator (74) Introduced openings (163, 164) for introducing evaporated fuel in the fuel tank (41) into the gas-liquid separator (74 ) and liquid fuel in the gas-liquid separator (74) to the fuel tank (41) . Return return openings (163, 164) , a discharge pipe (75) extending from the gas-liquid separator (74) and guiding the evaporated fuel, and provided at the tip of the discharge pipe (75) for adsorbing the evaporated fuel A motorcycle equipped with a canister (44) ,
After extending from the gas-liquid separator (74) in the vehicle width direction of the fuel tank (41) , the fuel tank (41) is folded back in the vehicle width direction, and the bent portions (155, 156) are positioned outside in the vehicle width direction. Two folded pipes (147, 148) are arranged ,
With connecting the respective one end of the previous SL two folded pipe (147, 148) to the gas-liquid separator (74), forming the introduction aperture (163, 164) at the other end, these two introduction openings (163, 164) are disposed on both ends of the fuel tank (41) in the vehicle width direction ,
Before SL folded pipe (147, 148) are formed two in a substantially U shape, when viewed from above the vehicle, two inlet pipes linear portion having the inlet opening (163) (153 ) Are arranged to overlap ,
When the vehicle body is tilted to the left or right, the liquid fuel flows from the introduction opening (164) of the other folded pipe (148) of the folded pipes (147, 148), and the evaporated fuel flows from the folded pipe (147). 148) after flowing into the gas-liquid separator (74) from the introduction opening (163) of one of the folded pipes (147), and then flowing into the discharge pipe (75),
When the vehicle body tilts to the left and right, the liquid fuel flows from the introduction opening (163) of one of the folded pipes (147, 148), and the evaporated fuel flows from the folded pipe (147). 148) from the introduction opening (164) of the other folded pipe (148) in the gas-liquid separator (74), and then to the discharge pipe (75),
When the vehicle body returns to the horizontal position, the evaporated fuel flows into the gas-liquid separator (74) from the folded pipe that is not immersed in the oil surface, and then flows into the discharge pipe (75) and the one folded. The liquid fuel that has flowed into the pipe (147), the other folded pipe (148), or the gas-liquid separator (74) passes through the fuel tank (41) from the introduction openings (163, 164) that also serve as a return opening. automatic motorcycle characterized in that as return to. The folded pipes (147, 148) are connected to the lowermost part of the gas-liquid separator (74) by pipe connection parts (145, 146) , and the introduction openings (163, 164) are connected to the pipe connection parts (145, 146) . claim 1 Symbol placement motorcycle, characterized in that it is respectively arranged below 146). The top of the fuel tank (41), and, substantially in the center, the fuel supply port (113) is provided, fill tube formed in a cylindrical shape to the fuel tank (41) from the filler opening (113) (114) There is extended, the inlet opening (163, 164) is according to claim 1 or請 Motomeko 2 Symbol placement motorcycle, characterized in that it is disposed above the lower surface of the oil supply pipe (114u). The fuel tank (41) includes an upper half (112) and a lower half (111), and a stay for attaching the gas-liquid separator (74) to the fuel tank (41) on the lower half (111). The motorcycle according to any one of claims 1 to 3 , wherein the (127) and the discharge pipe (75) are attached.

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