JP5581847B2 - Motorcycle canister arrangement structure - Google Patents

Description

  The present invention relates to a canister arrangement structure for a motorcycle that adsorbs evaporated fuel gas in a fuel tank and arranges a canister for supplying the evaporated fuel gas to an engine.

  Conventionally, in a fuel tank of a motorcycle, it is known that the stored fuel is vaporized and stays as evaporated fuel gas in the upper part of the fuel tank. The evaporative fuel gas leaking into the air when the engine is stopped causes waste of fuel and concerns about the environmental impact.

  In order to solve this problem, in Patent Document 1, a canister is disposed on a seat rail of a motorcycle, and the evaporated fuel gas in the fuel tank is guided to the canister and adsorbed by activated carbon or the like in the canister, and then the engine is started. Sometimes, an apparatus for sucking evaporated fuel gas in a canister into a carburetor is disclosed.

JP-A-8-142959

  However, in the apparatus structure described in Patent Document 1, since the canister is installed on the seat rail, both the canister and the fuel tank and the engine are disposed far away. For this reason, both the pipe connecting the fuel tank and the canister and the pipe connecting the canister and the carburetor are long, and the ventilation resistance of the evaporated fuel gas flowing through these pipes increases. Accordingly, when the engine is started, it takes time until the evaporated fuel gas is supplied from the canister to the engine and the evaporated fuel gas is completely consumed, and it may take a long time until the operation of the engine is stabilized.

  In addition, when the engine speed is drastically reduced due to repeated start and stop due to running in urban areas and recent idling stops, the evaporated fuel gas may stay in the canister. At this time, if the canister is heated by the outside air temperature, the adsorptivity of the activated carbon in the canister is lowered, and the evaporated fuel gas may not be sufficiently adsorbed. For this reason, in the past, a larger canister had to be prepared in order to provide a sufficient suction capacity.

  An object of the present invention has been made in consideration of the above-described circumstances, and provides a canister arrangement structure for a motorcycle that consumes evaporated fuel gas in the canister at the early stage of engine start and can stabilize the operation of the engine at an early stage. There is to do.

  Another object of the present invention is to provide a canister arrangement structure for a motorcycle capable of collecting the evaporated fuel gas immediately in response to a sudden increase in the evaporated fuel gas.

The present invention relates to an engine, an air cleaner disposed above the engine through a ventilation passage for supplying clean air to the engine, and a fuel disposed behind the air cleaner and supplied to the engine. A canister arrangement structure for a motorcycle in which the canister is arranged in a motorcycle having a fuel tank and a canister for temporarily collecting the evaporated fuel gas generated in the fuel tank, wherein the canister includes the fuel It is installed in the upper part of the said air cleaner arrange | positioned ahead of a tank.

  According to the present invention, since the canister can be disposed close to each of the fuel tank and the ventilation passage, both the pipe connecting the canister and the fuel tank and the piping connecting the canister and the ventilation passage can be shortened. For this reason, since the ventilation resistance of the evaporated fuel gas flowing in these pipes can be reduced, the evaporated fuel gas in the canister is sucked into the ventilation passage even if the negative pressure in the ventilation passage at the time of starting the engine is slight. Can do. As a result, the evaporated fuel gas in the canister can be consumed at the beginning of the engine start, and the operation of the engine can be stabilized at an early stage.

1 is a left side view showing a motorcycle to which a first embodiment of a canister arrangement structure for a motorcycle according to the present invention is applied. FIG. FIG. 2 is a left side view showing the main parts of the motorcycle of FIG. FIG. 2 is a side view showing a body frame, an engine, an air cleaner and the like of the motorcycle of FIG. 1. IV arrow line view of FIG. The top view which shows the air cleaner and canister of FIG. The perspective view which shows the air cleaner and canister of FIG. Sectional drawing which follows the VII-VII line of FIG. FIG. 6 is a left side view of the motorcycle to which the second embodiment of the canister arrangement structure for a motorcycle according to the present invention is applied is shown through a main part such as an engine, an air cleaner, and a fuel tank.

  The best mode for carrying out the present invention will be described below with reference to the drawings. However, the present invention is not limited to these embodiments.

[A] First embodiment (FIGS. 1 to 7)
FIG. 1 is a left side view showing a motorcycle to which a first embodiment of a canister arrangement structure for an automobile according to the present invention is applied. FIG. 2 is a left side view of the main part of the motorcycle of FIG. 1, such as an engine, an air cleaner, and a fuel tank, seen through. In the present embodiment, expressions such as up / down, left / right, and front / rear are based on the driver when riding the vehicle.

  A motorcycle 10 shown in FIGS. 1 and 2 is a so-called sports-type vehicle in which the front side of the vehicle is covered with a streamlined exterior cover (described later). In the motorcycle 10, a main frame 11 extending in the front-rear direction is disposed substantially in the center of the vehicle, and a head pipe 12 is provided at a front end thereof. A steering shaft (not shown) is pivotally supported on the head pipe 12 so as to be rotatable to the left and right, and a front wheel 13 is suspended from the steering shaft via a pair of left and right front forks 9. Above the head pipe 12, a handle 14 is connected to the steering shaft so as to rotate together, and the front wheel 13 can be rotated left and right by steering the handle 14. A fuel tank 15 that stores fuel supplied to the engine 16 is disposed above the main frame 11.

  An engine 16 is disposed in front of and below the main frame 11. An air cleaner 17 is connected to the engine 16 via a ventilation passage 50 (described later) including an intake pipe 18 above the engine 16 and in front of the fuel tank 15. Arranged. Outside air (air) is introduced into the air cleaner 17 from an air duct 49 described later. The outside air introduced from the air duct 49 is purified in the air cleaner 17, mixed with fuel from a carburetor or a fuel injection device 53 (described later), and supplied to the engine 16.

  Further, as shown in FIG. 2, the exhaust gas from the engine 16 is connected to the front portion of the engine 16 and extends rearward and downward, and a silencer 20 connected to the rear end of the exhaust pipe 19. It is discharged to the rear of the vehicle.

  The front end of the swing arm 21 is swingably connected to the lower rear portion of the main frame 11. A rear wheel 22 is rotatably supported at the rear end of the swing arm 21. The power of the engine 16 is transmitted to the rear wheel 22 by a drive chain 23 or the like.

  A seat rail 24 is provided on the rear upper part of the main frame 11 so as to extend rearward and upward. A load acting on the front seat 25 and the rear seat 26 is supported by the seat rail 24. A body frame of the motorcycle 10 is configured by including the main frame 11 and the seat rail 24.

  Here, as shown in FIGS. 3 and 4, the main frame 11 includes a top frame 27 disposed on the front side and a pair of left and right end frames 28 connected to the rear portion of the top frame 27. Is done. The top frame 27 is provided with a pair of left and right hanging parts 27 </ b> A that are hung downward and rearward from immediately after the head pipe 12, with the head pipe 12 being integrated at the front part. The end frame 28 is formed to bend backward and downward from the connection portion with the top frame 27, and the subframe portion 28A extends toward the hanging portion 27A in the middle, and the subframe portion 28A is coupled to the hanging portion 27A. The In addition, a center bridge 28B extending in parallel with the vehicle width direction is integrally formed on the rear upper portion of the end frame 28, so that the rigidity of the main frame 11 is enhanced.

  Further, the engine 16 includes a cylinder assembly 29 and a crankcase 30 as shown in FIGS. 1, 2, and 3. In the present embodiment, the cylinder head 33 and the head cover 34 are sequentially coupled to the cylinder 35 of the upper case 31 to form a cylinder assembly 29, and the lower case as the lower half of the crankcase is formed on the upper half of the crankcase of the upper case 31. 32 is joined and the crankcase 30 is comprised.

A piston (not shown) moves up and down in the cylinder 35, and a crankshaft 36 connected to the piston is rotatably supported in a crank chamber (not shown) of the crankcase 30, and a valve is operated in the cylinder head 33 and the head cover 34. A device (not shown) is arranged to constitute the engine 16. The crankcase 30 is formed with a transmission chamber (both not shown) that accommodates the transmission gear train behind the crank chamber.

  Further, a breather chamber 37 is installed at the top of the crankcase 30 as shown in FIG. The breather chamber 37 gas-liquid separates the oil mist generated in the mission chamber, guides the oil mist to the mission chamber, and guides the gas to the air cleaner 17 via the breather hose 38 (FIG. 3). Note that blow-by gas from the crank chamber of the crankcase 30 is also guided to the air cleaner 17 via a breather hose (not shown).

  The engine 16 is configured such that through bolts 40 are inserted into the suspension bolt holes 39A formed in the top frame 27 of the main frame 11 and the suspension bolt holes 39B and 39C formed in the end frame 28. 11 is suspended. The end frame 28 of the main frame 11 is provided with a swing shaft 41 that rotatably supports the swing arm 21. Also, reference numeral 39 in FIG. 3 denotes an oil pan coupled to the lower case 32.

  As shown in FIGS. 1 and 2, the exterior cover described at the beginning includes a streamlined front cover 42 that is disposed in front of the main frame 11 and covers the front of the vehicle, a side cover 43 that covers the side of the vehicle, The lower cover 44 that covers the lower part of the vehicle, the engine side cover 45 that covers the side surface of the engine 16, and the rear cover 46 that covers the seat rail 24 are configured. A headlight 47 as a headlamp is disposed at the front end of the front cover 42, and an air guide port 48 through which traveling wind can be introduced at both outer sides in the vehicle width direction than the headlight 47 is formed.

  Air ducts 49 are respectively disposed on the left and right sides of the headlight 47 inside the front cover 42. The air duct 49 extends from the air guide port 48 toward the air cleaner 17 through the side of the headlight 47. Thereby, the traveling wind (outside air) introduced from the air guide port 48 during traveling of the vehicle is guided to the air cleaner 17 through the air duct 49, and is efficiently charged into the engine 16 by this supercharging effect.

  A ventilation passage 50 (including the intake pipe 18) for connecting the air cleaner 17 to the engine 16 includes a throttle body 51 connected to the air cleaner 17 and the in-tape pipe 18 connected to the intake port 52 in the cylinder head 33 of the engine 16. Are connected to each other. The fuel injection device 53 (FIG. 7) is installed in the throttle body 51 so as to inject fuel toward the intake port 52 of the engine 16. The ventilation passage 50 extends upward from the intake port 52 of the cylinder head 33.

  As shown in FIGS. 5 to 7, the air cleaner 17 is configured by a pair of left and right air guide ducts 54 extending forward from a resin air cleaner container 55, and a filter 56 disposed in the air cleaner container 55. In the air cleaner 17, the internal space of the air cleaner container 55 is partitioned into a dirty room 57 and a clean room 58 with the filter 56 (FIG. 7) as a boundary. The clean room 58 is provided on the upper portion of the air cleaner 17. Further, the dirty room 57 is provided in the lower part on the front side of the clean room 58. An air guide duct 54 communicates with the dirty room 57, and an air duct 49 is connected to the air guide duct 54. The throttle body 51 of the ventilation passage 50 is connected to the rear bottom portion of the clean room 58.

  Accordingly, outside air is guided from the air duct 49 into the dirty room 57 of the air cleaner 17 via the air guide duct 54, and the outside air is purified by removing dust and the like by the filter 56, and becomes clean air into the clean room 58. Led. This clean air is supplied to the intake port 52 of the engine 16 through the ventilation passage 50 as an air-fuel mixture together with the fuel injected from the fuel injection device 53.

  In addition, a maintenance hole 59 opened for replacement of the filter 56 is provided in the upper portion of the air cleaner container 55, that is, the top surface 55 </ b> A, at a position substantially directly above the filter 56, communicating with the clean room 58.

  In the in-tape pipe 18 of the ventilation passage 50, an end portion 18A connected to the throttle body 51 is formed of elastic resin, hard rubber, or the like. Therefore, the air cleaner 17 is elastically supported by the ventilation passage 50. For this reason, the vibration from the road surface and the vibration of the engine 16 that occur during traveling are attenuated by the end 18 </ b> A of the intake pipe 18 and are prevented from being transmitted to the air cleaner 17.

Now, the fuel is vaporized in the fuel tank 15 shown in FIGS. 1 and 2, and this evaporated fuel gas may stay in the upper part of the fuel tank 15. These are temporarily collected by a canister 60 installed on the upper part of the air cleaner 17.

  As shown in FIG. 5, the canister 60 has a partition plate 62 movably disposed in, for example, a resin canister container 61, and the inside of the canister container 61 contains activated carbon 63 as an adsorbent by the partition plate 62. It is divided into an activated carbon chamber 64 for accommodating and a spring chamber 66 for accommodating the spring 65. The activated carbon 63 adsorbs the evaporated fuel gas and temporarily collects it. In addition, the spring 65 constantly presses the partition plate 62 and applies a spring biasing force in a direction to reduce the volume of the activated carbon chamber 64, thereby preventing a gap from being generated in the activated carbon chamber 64.

  As shown in FIGS. 5 and 7, an inlet pipe 67 and an outlet pipe 68 are provided on the canister container 61 on the activated carbon chamber 64 side. The inlet pipe 67 communicates with the activated carbon chamber 64 and is connected to the fuel tank 15 via the inlet hose 69. The outlet pipe 68 communicates with the activated carbon chamber 64 through a purge valve 72 described later, and is connected to the intake pipe 18 through the outlet hose 70. Further, as shown in FIGS. 5 and 6, an outside air release port 71 is provided in the spring chamber 66 so as to communicate therewith. The air release port 71 sucks air into the spring chamber 66 when the engine 16 is operated.

  In the canister vessel 61, a purge valve 72 is installed in communication with the outlet pipe 68 and the activated carbon chamber 64. The purge valve 72 is configured using a solenoid valve that is electronically opened and closed according to the operating state of the engine 16. The purge valve 72 is opened when the engine 16 is in operation, and allows the activated carbon chamber 64 and the outlet hose 70 to communicate with each other.

  Accordingly, as shown in FIGS. 5 and 7, the evaporated fuel gas generated in the fuel tank 15 is introduced into the activated carbon chamber 64 of the canister 60 through the inlet hose 69 and is adsorbed by the activated carbon 63 in the activated carbon chamber 64. Collected temporarily. When the engine 16 is operated, the purge valve 72 is opened, and the activated carbon chamber 64 of the canister 60 and the intake pipe 18 of the ventilation passage 50 are in communication with each other via the purge valve 72 and the outlet hose 70. At this time, since the intake pipe 18 is in a negative pressure state due to a lowering operation of a piston (not shown) disposed in the engine 16, the evaporated fuel gas collected by the activated carbon 63 of the canister 60 is sucked into the intake pipe 18. The The suction of the evaporated fuel gas is promoted by sucking the atmosphere from the atmosphere opening port 71.

  As shown in FIG. 6, the canister 60 is installed on the top of the air cleaner 17, that is, on the top surface 55 </ b> A of the air cleaner container 55 in the air cleaner 17. As shown in FIG. 7, a maintenance hole 59 is opened on the top surface 55 </ b> A of the air cleaner container 55. The canister 60 is installed on the top surface 55 </ b> A of the air cleaner container 55 so as to close the maintenance hole 59. An edge 73 around the maintenance hole 59 projects upward on the top surface 55A. A circumferential groove 74 is formed on the bottom surface of the canister container 61 in the canister 60 corresponding to the edge 73, and the edge 73 of the air cleaner container 55 is fitted into the circumferential groove 74. In this fitted state, the canister container 61 is fixedly installed on the top surface 55A of the air cleaner container 55 using a bolt or the like (not shown).

  At this time, an annular seal material 75 made of an elastic material is interposed between the edge 73 of the air cleaner container 55 and the circumferential groove 74 of the canister container 61. When the canister 60 is fixed to the upper portion of the air cleaner 17 using bolts or the like, the sealing material 75 is contracted between the edge portion 73 and the circumferential groove 74 to seal these gaps in an airtight state.

  As shown in FIGS. 1 and 2, the canister 60 is installed above the air cleaner 17 and disposed above the air cleaner 17, and is disposed in front of the fuel tank 15 installed behind the air cleaner 17. The Further, the fuel tank 15 is formed with a flange 76 that covers at least the upper part of the canister 60 (for example, the upper part of the canister 60 or the upper part and the side of the canister 60). The motorcycle 10 is provided with a tank cover 77 that covers the front and sides of the canister 60 and the air cleaner 17 continuously from the flange 76.

  With the configuration as described above, the following effects (1) to (8) are achieved according to the present embodiment.

  (1) The canister 60 is installed above the air cleaner 17 arranged above the engine 16 and in front of the fuel tank 15 arranged behind the air cleaner 17. For this reason, since the canister 60 can be disposed close to each of the fuel tank 15 and the ventilation passage 50, the inlet hose 69 that connects the canister 60 and the fuel tank 15 and the intake pipe 18 of the canister 60 and the ventilation passage 50 are connected. The outlet hose 70 to be used can be shortened together. Accordingly, since the resistance to vaporization of the evaporated fuel gas flowing through the inlet hose 69 and the outlet hose 70 can be reduced, even if the negative pressure in the intake pipe 18 at the time of starting the engine 16 is small, The evaporated fuel gas can be sucked into the intake pipe 18. As a result, the evaporated fuel gas in the canister 60 can be consumed at the initial start of the engine 16, and the operation of the engine 16 can be stabilized at an early stage.

  (2) The canister 60 is disposed close to each of the fuel tank 15 and the intake pipe 18 of the ventilation passage 50, and the inlet hose 69 that connects the canister 60 and the fuel tank 15; the canister 60 and the intake pipe 18; Since both the outlet hose 70 connecting the two can be shortened, the cost and weight can be reduced. Further, since the air cleaner 17 can be used as a bracket for mounting the canister 60, the number of parts is reduced, and the cost and weight can be reduced from this viewpoint.

  (3) Since the motorcycle 10 is provided with a tank cover 77 that covers the front and sides of the canister 60 continuously to the fuel tank 15, the direct sunlight to the canister 60 is blocked and the temperature of the canister 60 is The rise can be suppressed. In general, the activated carbon 63 in the canister 60 has reduced evaporative fuel gas adsorptivity at a high temperature, but the temperature rise of the canister 60 can be suppressed to prevent the activated carbon 63 from decreasing in adsorbability. As a result, it is possible to avoid an increase in the size of the canister 60 due to a decrease in the adsorptivity of the activated carbon 63.

  (4) The fuel tank 15 is formed with a flange 70 that covers at least the upper part of the canister 60. As described above, the activated carbon 63 in the canister 60 has reduced evaporative fuel gas adsorbability at high temperatures. However, the flange 76 of the fuel tank 15 blocks the direct sunlight of the canister 60, thereby increasing the temperature of the canister 60. Can be suppressed. Further, since the fuel in the fuel tank 15 (including the flange 76) exists in the vicinity of the canister 60, the cooling effect of the canister 60 can be achieved. At this time, when the fuel tank 15 (including the flange portion 76) is brought into contact with the canister 60, the cooling effect is further improved. As a result, it is possible to prevent a decrease in the adsorptivity of the activated carbon 63 in the canister 60 and to avoid an increase in the size of the canister 60.

  (5) When the motorcycle 10 travels, the evaporated fuel gas generated in the fuel tank 15 always passes through the canister 60 and is supplied to the ventilation passage 50. In general, the evaporated fuel gas in the canister 60 is sucked by the intake negative pressure of the engine 16, so that the higher the engine speed, the higher the flow rate of the evaporated fuel gas. Since the flow velocity increases with respect to the generation amount of the evaporated fuel gas, the influence on the operation of the engine 16 becomes so weak that it can be ignored.

  However, the evaporated fuel gas may stay in the canister 60 when the rotational speed of the engine 16 is abruptly reduced due to repeated start and stop due to running in the urban area or a recent idling stop. At this time, if the canister 60 is heated by the outside air temperature, the evaporated fuel gas may not be sufficiently adsorbed, and a larger canister must be prepared in order to provide a sufficient adsorbing capacity.

  On the other hand, by installing the canister 60 on the upper portion of the air cleaner 17, when the traveling wind passes through the air cleaner 17 during traveling of the motorcycle 10, the traveling wind takes heat from the bottom surface of the canister 60, and the canister 60 Can be cooled. Therefore, since the canister 60 can always be maintained at a low temperature, it is possible to ensure good adsorbability of the activated carbon 63 in the canister 60. As a result, the canister 60 can immediately respond to the increase in the evaporated fuel gas due to the rapid decrease in the rotational speed of the engine 16 and can reliably adsorb the evaporated fuel gas, thereby avoiding the enlargement of the canister 60. .

  (6) The activated carbon 63 accommodated in the canister 60 may be damaged when strong vibration is applied to the canister 60. Since the air cleaner 17 provided with the canister 60 is elastically supported by the end 18A of the intake pipe 18 in the ventilation passage 50, the vibration of the engine 16 and the vibration from the road surface during traveling are not affected by the end 18A of the intake pipe 18. Is suppressed from being transmitted to the air cleaner 17. As a result, the canister 60 provided in the air cleaner 17 is not subjected to strong vibration during traveling, so that the activated carbon 63 in the canister 60 can be reliably prevented from being damaged and protected.

  (7) Generally, the air cleaner container 55 of the air cleaner 17 includes a container main body 78 and a lid member 79 as shown in FIGS. 6 and 7, and a filter 56 is installed in the air cleaner container 55. Therefore, the mating surface of the container main body 78 and the lid member 79 has a large diameter. Therefore, in order to completely seal the mating surfaces, it is necessary to fix a plurality of screws at equal intervals near the mating surfaces of the container main body 78 and the lid member 79. When the filter 49 is replaced, it is necessary to release all of these screws, so that the burden on the operator is enormous.

  In contrast, in the present embodiment, the canister 60 is installed in the air cleaner 17 so as to close the maintenance hole 59 for replacing the filter 56 provided in the air cleaner container 55 of the air cleaner 17. Since the maintenance hole 59 has a relatively small diameter due to the mating surface of the container main body 78 and the lid member 79, when the canister 60 is attached to the air cleaner 17 so as to close the maintenance hole 59, a screw for this attachment is used. Tightening points can be reduced. As a result, the replacement work of the filter 56 in the air cleaner 17 can be easily performed.

  (8) Since the canister 60 is installed on the upper portion of the air cleaner 17 and covered with the flange 76 and the tank cover 77 of the fuel tank 15, the maintenance operation for removing the tank cover 77 and lifting the fuel tank 15 is performed. The canister 60 can be easily maintained.

[B] Second embodiment (FIG. 8)
FIG. 8 is a left side view of the motorcycle, to which the second embodiment of the canister arrangement structure for an automobile according to the present invention is applied, seen through the main parts such as an engine, an air cleaner, and a fuel tank. In the second embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description is simplified or omitted.

  The second embodiment is different from the first embodiment in that the flange 76 is not formed in the fuel tank 80 and the canister 60, the air cleaner 17 and the fuel tank 80 disposed above the air cleaner 17 The front portion, the upper portion, and the side portion of each are covered with a tank cover 81. Also in the present embodiment, the canister 60 is disposed above the air cleaner 17, but is preferably installed on the top surface 55 </ b> A of the air cleaner container 55 of the air cleaner 17.

  Also in the present embodiment, the canister 60 is disposed in front of the fuel tank 80 and above the air cleaner 17, and the front and upper sides of the canister 60 are covered with the tank cover 81. In addition to the effects (1) to (3), (5), (6) and (8) of the embodiment, the following effect (9) is achieved.

  (9) Since the fuel tank 80, the air cleaner 17 and the canister 60 are covered with the tank cover 81, it is necessary to enlarge the fuel tank 80, for example, by providing a flange to block the direct sunlight of the canister 60. Absent. However, also in this case, it is preferable that the fuel tank 80 is disposed in the vicinity of the canister 60 and contributes to suppression of the temperature rise of the canister 60.

DESCRIPTION OF SYMBOLS 10 Motorcycle 15 Fuel tank 16 Engine 17 Air cleaner 18 Intake pipe 50 Ventilation passage 55 Air cleaner container 55A Top surface 59 Maintenance hole 60 Canister 76 Fuel tank collar 77 Tank cover 80 Fuel tank 81 Tank cover

Claims (4)

An engine,
An air cleaner disposed above the engine via a ventilation passage for supplying clean air to the engine;
A fuel tank that is disposed behind the air cleaner and stores fuel supplied to the engine;
A canister arrangement structure for a motorcycle in which the canister is arranged in a motorcycle having a canister for temporarily collecting the evaporated fuel gas generated in the fuel tank,
A canister arrangement structure for a motorcycle, wherein the canister is installed on an upper portion of the air cleaner arranged in front of the fuel tank. The canister arrangement structure for a motorcycle according to claim 1, wherein the motorcycle includes a cover that covers a front or upper portion of the canister. 2. The canister arrangement structure for a motorcycle according to claim 1, wherein the fuel tank includes a flange portion that covers at least an upper portion of the canister. The canister arrangement structure for a motorcycle according to claim 1 , wherein a maintenance hole is provided in an upper portion of the air cleaner, and a canister is installed in the air cleaner so as to close the maintenance hole.

Images