DESC:FIELD OF THE INVENTION
The present invention relates to a canister arrangement for a motorcycle, and particularly but not exclusively to a canister arrangement for a motorcycle having a frame structure.

BACKGROUND TO THE INVENTION
There has been a demand to control emission of fuel vapour (evaporation gas) from a fuel tank of, for example, a motorcycle, in consideration of environmental impacts. To control the emission of fuel vapour, a canister filled with activated carbon for adsorbing fuel vapour is mounted to a motorcycle. The canister stores fuel vapour. The fuel vapour in the canister is redirected to the engine at appropriate time so that emission of fuel vapour from tank to atmosphere is prevented. The engine’s emissions and the motorcycle’s driveability remain largely unaffected.
The canister is connected to a fuel tank breather via an inlet pipe. The inlet pipe is also known as a charge hose. The breather provides path for gaseous fuel from fuel tank to canister. The canister thereby adsorbs fuel vapour discharged from the fuel tank breather. The fuel vapour adsorbed by the canister is supplied to a combustion chamber of an engine via air cleaner through an outlet pipe (a purge hose), and is burned therein.
When locating a canister on a motorcycle, a few considerations need to be made. Firstly, the canister needs to be away from heat sources such as the engine or the exhaust pipe in order to prevent damage to the canister. Secondly, the canister should not be directly visible so that it does not adversely affect the aesthetics of the motorcycle. Thirdly, it is desirable that the length of the inlet pipe and the outlet pipe connecting to canister is optimised for proper functioning, convenience during assembly and service of the motorcycle.
With these considerations in mind, it is important to identify and locate the canister at a suitable location on a specific motorcycle having a particular type of: (a) frame structure, (b) engine positioning and orientation, and (c) positioning of other motorcycle components such as air filter, fuel intake components, shape and structure of fuel tank etc. Furthermore, it is also important that the location of the canister arrangement does not adversely affect or compromise other layouts and systems of the motorcycle
Therefore, it is always challenging for a motorcycle designer to identify a suitable location for a canister when faced with the aforementioned considerations for mounting the canister and limitations of a specific motorcycle.
The challenge is intensified if the canister is to be located on an existing motorcycle design. Locating a canister on an existing motorcycle design without adversely affecting the aesthetics of the motorcycle and without redesigning of other components is particularly problematic. Redesigning of the motorcycle and repositioning of the components to accommodate a canister is costly.
There are various prior art documents describing the location of the canister on a specific motorcycle. These prior art documents disclose solving problems related to specific type of motorcycle frame, and specific design and layout of engine and other components of motorcycle.
The present invention addresses the problem of locating a canister position for a motorcycle having a frame structure, engine orientation, and layout of other systems of the motorcycle.
It is an object of the present invention to provide a canister arrangement for motorcycle such that the canister is located away from heat sources.
It is a further object of the present invention to locate a canister on a motorcycle such that the canister is at least partially hidden that is the canister is not visible directly. Ideally, the arrangement is such that the aesthetic appearance of vehicle is unaffected as well as the canister is adequately protected.
It is a further object of the present invention to locate a canister on a motorcycle such that the total length of the inlet tube and the outlet tube are optimised.
It is a further object of the present invention to locate a canister without compromising the placement or positioning and space requirements of other sub systems or systems of the motorcycle.
It is also an object of the present invention to mount a canister arrangement over the frame structure of a motorcycle considering the above objectives.

SUMMARY OF THE INVENTION
With the aforementioned problems and objectives in mind, an aspect of the present invention provides a motorcycle including:
a frame structure,
a head pipe being connected at a front end of the frame structure,
a fuel tank mounted on said frame structure, and
a canister for adsorbing fuel vapours generated in the fuel tank and delivering the fuel vapours to an engine mounted on the frame structure,
wherein the canister is mounted on the frame structure such that at least a portion of the canister is located rearward of the head pipe, and at least a portion of the canister is located forward of the fuel tank.
Mounting the canister on the frame structure advantageously eliminates the need for a mounting platform, stay member or an additional structural element appended to the frame structure in order to mount the canister on. The frame structure is sufficiently sturdy for mounting the canister.
Furthermore, as the frame structure holds the fuel tank (inlet to the canister) and the engine (outlet of the canister), the canister is proximate to its application. The size and lengths of the inlet conduit feeding fuel vapours to the canister and the outlet conduit feeding fuel to the engine can be optimised.
The canister located at least partially between the head pipe and the fuel tank does not interfere with the rider of the motorcycle. This location at least reduces the need for modifying the motorcycle design for rider comfort. Additionally, the location is suitable for hiding the canister from view by mounting a fuel tank cover.
The canister may be located proximate the front end of the frame structure. Preferably, the canister is located nearer to the head pipe than the engine. Preferably, the canister is located forward of the fuel tank.
The canister at this preferred location is away from the local heat zone and the canister is thereby protected from the direct heat of the engine, that is canister is away from cylinder of the engine. Therefore, the canister does not receive direct heat of the engine. Furthermore, this location is away from the exhaust pipe which also creates a local heat zone. The exhaust is generally located rearward of the engine. Therefore, the canister does not receive direct heat of the exhaust.
The canister may be located on the outer side of the frame structure. The outer side of the frame structure is the side of the frame structure facing towards the exterior of the motorcycle.
A motorcycle has various components held between the members the frame structure. The arrangement eliminates the need of compromising shape and positioning of fuel tank and other components which are located on the inner side of the frame structure.
The fuel tank has a width measured in a transverse direction of motorcycle. The canister may not extend beyond the width of the fuel tank. The canister is therefore further suitable for hiding under a cover. Importantly, the cover does not need to be bulged or recessed to accommodate the canister, whereby the aerodynamics of the vehicle is maintained.
The motorcycle may include a cover for at least partially covering the canister. The cover may be a fairing or a fuel tank cover.
A cover is useful for hiding the canister from view so that the canister is not directly visible. The fuel tank cover or a fairing generally provides an aesthetically pleasing appearance to the motorcycle. Furthermore, hiding the canister behind the fuel tank cover or a fairing eliminates the need for designing and manufacturing an additional cover to hide the canister. The canister is positioned within this cover and frame structure such that not demanding any special consideration or amendments shape and structure of frame and cover. Thus the cover may be of any shape .Also the cover does not require any ribs or any integral mounting arrangement structure for fixing the as the mounting of canister is on the frame structure. Importantly, the cover protects the canister from damage thereby adding safety to the motorcycle.
The canister may be mounted on to the frame structure by a fastening means. Preferably, the fastening means includes an attachment means mountable on or connectable to the frame structure and a clamping means for clamping the canister to the attachment means. Preferably, the clamping means is at least one resilient strap.
The canister may be mounted such that a front end of the canister having an inlet and an outlet is elevated from a rear end of the canister. Preferably, the canister is mounted substantially upright. This orientation of the canister is useful because it provides downward direction for the drain passage of canister to discharge residual moisture. The fuel vapours from the fuel tank enter the canister from above and the fuel vapours are discharged from the canister from above. Such front end elevation reduces residual moist fuel vapour remaining in the canister.
The canister could have external shape, for example, oval cylinder, frusto conical, prism, rectangular etc. to be accommodated on the frame structure .
The frame structure of the motorcycle may be a trellis type frame structure including:
an upper member on either side,
a lower member located below each of the upper members, and
at least one cross member on either side connecting the upper member of a side to the lower member of the same side,
a front portion of the frame structure extends rearward and downward from the head pipe, and a rear portion extending from the front portion.
The canister may be mounted on one of the upper members of said front portion of the frame structure of the motorcycle. Preferably, the canister is mounted on the left hand side upper member.
The canister may be mounted on the at least one cross member. The canister may be mounted on the upper member as well as the cross-member of the frame structure. Mounting the canister on the cross-member allows orientating the canister.
The canister may be located above the lower member. Preferably, at least a portion of the canister is located below the upper member. The canister is located such that it does not interfere with the other components. The canister is tidily placed such that the canister is easily accessible for maintenance.
Preferably, the fuel tank is mounted on the upper members of the frame structure and the engine is suspended from the lower members of the frame structure. Further, and preferably, the motor cycle includes a single rear shock absorber which is mounted on the frame structure. The motorcycle may also include a centrally located muffler adjacent to the rear shock absorber. The canister is preferably located ahead of the fuel tank, the engine, the rear shock absorber and the muffler.
A further aspect of the present invention provides a motorcycle including:
a trellis type frame structure including an upper member on either side, a lower member located below each of the upper members, and at least one cross member on either side connecting the upper member of a side to the lower member of the same side,
a head pipe being connected at a front end of the frame structure such that a front portion of the frame structure extends rearward and downward from the head pipe and a rear portion of the frame structure extending from said front portion of the frame structure, and
a canister for adsorbing fuel vapours generated in a fuel tank mounted on the frame structure and delivering the fuel vapours to an engine mounted on the frame structure,
wherein the canister is mounted on the frame structure and located distal to the front end of the frame structure.
This second aspect of the present invention and along with the preferred features is particularly suited for a motorcycle having a fairing. A fairing is a cover placed over the frame of the motorcycle to improve aesthetic aspect of motorcycle, reduce air drag and to protect the components of the motorcycle in case of an accident. The fitment of fairing to the frame structure requires mounting components such as brackets, at the front portion of frame structure. The mounting components reduce space available for placing canister at the front end of the frame structure. In such situation, the location of canister distal from front end of frame or from head pipe is convenient because this location does not compromise placement of other sub systems/components of motorcycle and also provides space for mounting fairing on the frame structure as well canister on the frame structure. Advantageously, the canister is readily hidden behind the fairing. Preferably, the canister is located on said front portion of the frame structure .Preferably the canister is positioned atleast partially above the lower most portion of fuel tank.The canister inlet /outlet is substantially above lower most portion of fuel tank.
The trellis type frame structure may include a connecting member connecting the upper member of said front portion of the frame structure of one side to the upper member of said rear portion of the frame structure of the same side. Preferably, the canister is located proximate to a joining of the connecting member and the upper member of said front portion of the frame structure; said joining is distal from front end of the frame structure where the head pipe may be located. Further preferably, the canister is located rearward to the joining of said upper member and the connecting member.
The motorcycle may include a cover for at least partially covering the canister. Preferably, the cover is a fairing.
Other features, elements, steps, characteristics and advantages of the present invention will become apparent from the following detailed description of preferred embodiment of the present invention with reference to the attached drawings.

BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in more detail by way of example with reference to the embodiments shown in the figures mentioned below.
No. Feature
100 Motorcycle
10 Frame structure
10a Front portion of the frame structure
10b Rear portion of the frame structure
12a Upper member of the front portion of the frame structure
12b Upper member of the rear portion of the frame structure
14a Lower member of the front portion of the frame structure
14b Lower member of the rear portion of the frame structure
16a Cross member of the front portion of the frame structure
16b Cross member of the rear portion of the frame structure
18 Head pipe
19 Connecting member
20 Fuel tank
20a Fuel tank lower portion
22 Fuel tank cover
24 Inlet conduit
26 Outlet conduit
27 Air suction passage
30 Engine
30a Cylinder Head
30b Crank case
40 Air filter
50 Canister
54 Canister inlet
56 Canister outlet
60 Fastening means
62 Attachment means
64 Clamping means
70 Fairing
75 Rear Wheel
80 Seat
85 Rear mud guard
90 Rear shock absorber
93 Carburettor
94 Y connector
95 Extension members for mounting rear foot rests
96 Drain pipe
97 Square shaped canister
98 Strap for Square shaped canister
99 Bracket for Square shaped canister

Figure 1 is a left hand side view of a motorcycle according to a first embodiment of the present invention without a fuel tank cover.
Figure 2 is a left hand side view of a motorcycle according to a first embodiment of the present invention with a fuel tank cover.
Figure 3 is a front view of a motorcycle according to a first embodiment of the present invention. Several components of the motorcycle are partially or completely hidden in this figure to explain the canister arrangement.
Figure 4 is a left hand side view of a motorcycle according to a first embodiment of the present invention. Several components of the motorcycle are partially or completely hidden in this figure to explain the canister arrangement.
Figure 5 is an enlarged detailed view of part of figure 3.
Figure 6 is a left hand side view of a motorcycle according to a second embodiment of the present invention without a fairing.
Figure 7 is a left hand side view of a motorcycle according to a second embodiment of the present invention with a fairing.
Figure 8 is an enlarged view of part of figure 6.
Figure 9 is an enlarged view of part of figure 6 without the fuel tank cover.
Figure 10a is a side view of a canister mounted on a frame structure according to the second embodiment of the present invention.
Figure 10b is the same view as figure 10a, additionally showing part of the inlet conduit and the outlet conduit of the canister.
Figure 10c is the same view as figure 10b, additionally showing partially hidden fairing.
Figure 10 d is same view as figure 10 a ,additionally showing fuel tank and engine mounted on frame structure.
Figure 11a is an isometric view of a canister mounted on a frame structure according to the second embodiment of the present invention.
Figure 11b is the same view as figure 11a, additionally showing part of the inlet conduit and the outlet conduit of the canister.
Figure 12 discloses further alternative embodiments of the present invention.
Figure 13 is the same view as figure 4 with alternative inlet tube routing of canister with a connector.
Figure 14 is the same view as figure 10a with alternative inlet tube routing of canister with a connector.
Figures 15 is the same view as figure 14 with square shaped canister.
Figure 16 is another view of figure 14 showing square shaped canister.
Figure 17 is another view of figure 16 showing mounting of canister on welded bracket on frame.

DESCRIPTION OF PREFERRED EMBODIMENT
Referring to figure 1, a motorcycle 100 has a trellis type frame structure 10 comprising a front portion 10a and rear portion 10b. The front portion 10a and the rear portion 10b are connected. Each of the front portion 10a and the rear portion 10b include an upper member 12a, 12b on either side of the motorcycle 100 and a corresponding lower member 14a, 14b below each upper member 12a, 12b. At least one cross member 16a, 16b connects the upper member 12a, 12b on a side to the lower member 14a, 14b of the same side. The motorcycle 100 has a plurality of cross-members 16a, 16b forming triangulated sections on either side of the motorcycle 100.
At a front end of the frame structure 10 the upper members 12a and the lower members 14a are connected to a head pipe 18. The members 12a, 14a extend rearward and downward from the head pipe 18.
On one side of the frame structure 10, the upper member 12a of the front portion 10a is connected to the upper member 12b of the rear portion 10b by a connecting member 19. Likewise, on the other side of the frame structure 10, another connecting member 19 connects the upper member 12a of the front portion 10a to the upper member 12b of the rear portion.
This is a trellis type frame structure which is generally formed by welding metal tubes into the above described cage arrangement.
Referring to figures 3, 4 and 5, a fuel tank 20 is mounted on the upper members 12a of the front portion 10a of the frame structure 10. The fuel tank 20 has a width larger than the width of the frame structure 10 such that the fuel tank 20 extends beyond the left hand side of the frame structure 10 and the right hand side of the frame structure 10. The width being measured in a transverse direction to the motorcycle 100. The fuel tank 20 extends equally on either side of the frame structure 10 in order to maintain symmetry of the motorcycle 100. The maximum width of the fuel tank 20 is limited by the interference that may be caused to a rider of the motorcycle 100.
A canister 50 for adsorbing fuel vapours generated in the fuel tank 20 is mounted on the frame structure 10. The canister 50 shown in this embodiment is generally cylindrical. However, it is envisaged that the canister 50 could have another external shape, for example, oval cylinder, frusto conical, prism, rectangular etc. to be accommodated on the frame structure 10.
An inlet conduit 24 connects the canister inlet 54 to a breather attached to the fuel tank 20. Fuel vapours in the fuel tank 20 pass through the breather and the inlet conduit 24 into the canister 50. An outlet conduit 26 delivers fuel collected in the canister 50 from the canister outlet 56 to the engine 30. The canister inlet 24 and the canister outlet 26 are located at a front end of the canister 50. An air suction passage 27 is located at a rear end of the canister. The canister is mounted such that the front end having the inlet 24 and outlet 26 is at an elevated position relative to the rear end having the air suction passage 27.
Alternatively the inlet conduit 24 (as shown in figure 13) may be connected canister inlet through connector, preferably Y shape connector (94). A a drain pipe 96 being connected to the said connector. Preferably the connector is between tank and canister to collect liquid petrol during condensation of vapours in the EVAP circuit and liquid flow in case of vehicle fall.
This also helps not to pass condensed fuel into the canister which may deteriorate function of canister
An engine 30 is suspended from the lower portion of frame structure 10. The engine 30 is located below the fuel tank 20. The engine 30 is positioned vertically upward i.e. the cylinder head (30 a) is above the crank case (30 b). The engine 30 is suspended from the lower structure of frame 10. The engine 30 is substantially perpendicular to the horizontal plane. In such types of frame normally, the engine is distal away from head pipe as compared down tube type and similar frame structure. Fuel tank may also be away from head pipe as compared down tube type and similar frame structure.
The motorcycle 100 has a mono-shock absorber and a centrally located muffler.

CANISTER MOUNTING AND ORIENTATION
Referring to figure 5, the canister 50 is mounted on a cross member 16a of the frame structure 10. The canister 50 is mounted on two point locations on the frame structure 10.
A fastening means 60 secures the canister 50 on to the frame structure 10. The fastening means 60 includes an attachment means 62 and a clamping means 64. The attachment means 62 includes a first bracket mounted on the frame structure and the second bracket is attached to the first bracket. The clamping means 64 braces the canister onto the second bracket of the attachment means 62. The clamping means 64 includes two resilient straps. The straps 64 are made of rubber. The canister 50 is held on to the second bracket by the two rubber straps 64. The rubber straps 64 are flexible in order to clamp the canister 50 by elastically stretching on the external surface of the canister 50. The ends of the rubber straps 64 are anchored on the lugs provided on the second bracket of the attachment means 62.
The canister 50 is mounted substantially upright. The canister 50 being upright allows residual fuel vapour to exit the canister 50 efficiently. The canister 50 is at a slight angle to the vertical plane in order to accommodate the canister 50 in an existing fuel tank cover 22. This angle can be adjusted by adjusting the brackets of the attachment means 62.
Other orientations of the canister 50 are also possible. As seen in the embodiment of figures 6 to 11b, in a second embodiment the canister 50 is oriented inclined to horizontal plane having the front end elevated relative to rear end. The canister 50 is substantially in line with the upper member 12a of the front frame structure 10a. Such orientation would still substantially provide the above mentioned advantageous effect.

CANISTER COVER
Referring to figures 1, 2 and 4, a fuel tank cover 22 at least partially covers the fuel tank 20 and the canister 50. The fuel tank cover 22 is made of suitable plastic material. The canister 50 is hidden behind the fuel tank cover 22. Additionally, the inlet conduit 24 is also hidden under the fuel tank cover 22. The fuel tank cover 22 not only maintains the aesthetics of the motorcycle 100 but also protects the canister 50 and the inlet conduit 24 from damage. A damaged canister 50 may be hazardous because it could contain fuel. An object forcefully directed towards the canister 50 (from outside the motorcycle) will impact the fuel tank cover 22 before it impacts the canister 50. Therefore, the fuel tank cover 22 adds a degree of protection to the canister 50.
Referring to figures 6 to 9 and 10c, in a second embodiment, the fairing 70 covers the canister 50. The fairing 70 covers and protects several other components the motorcycle. The fairing 70 extends from just behind the front mud guard to the fuel tank 20.
Therefore, the present invention offers a canister 50 mounting solution for a motorcycle 100 with partial fairing such as a fuel tank cover 22 as well as a motorcycle 100 with full fairing 70.

CANISTER LOCATION
Referring to figures 3 and 4, the canister 50 is located on the outer side of the frame structure 10. The outer side of the frame structure 10 is the side towards the exterior of the motorcycle 100. Generally many components are located on the inner side of the frame structure 10 of a motorcycle 100. The proposed location of the canister 50 (on the outer side of the frame structure) does not disturb the arrangement of the components on the inner side of the frame structure 10.
The canister 50 does not extend beyond the width of the fuel tank 20 along the transverse direction of motorcycle 100. The canister 50 does not occupy more width than the fuel tank 20. Therefore, the fuel tank cover 22 originally made to fit over the fuel tank 30 does not need to be modified to accommodate the canister 50. Importantly, the existing fuel tank cover 22 does not have to bulge to accommodate the canister 50, which may affect the aerodynamics of the motorcycle 100.
The canister 50 is located proximate to the front end of the frame structure 10. The front end of the frame structure 10 is the end proximate to the head pipe 18 of the motorcycle 100. In particular, the canister 50 is located rearward from the head pipe 18, and a portion of the canister 50 is located forward of the fuel tank 20.
The canister 50 is located ahead of the engine 30. Since the fuel tank 20 is located above the engine 20, locating the canister 50 in front of the fuel tank 20 automatically positions the canister 50 ahead of the engine 30. The canister 50 is therefore located upward and forward of the engine 30. Therefore, the canister 50 is away from the heat zone surrounding the engine 30 when the engine 30 is running.
The canister 50 is located above the lower member 14a. A substantial portion of the canister 50 is located below the upper member 12a. Ideally, the body of the canister 50 is located between the upper member 12a and the lower member 14a.
In the second embodiment seen in figures 6 to 11b, the canister 50 is located distal to the front end of the frame structure 10 i.e. away from the head pipe 18. The canister 50 is located on the outer side of the frame structure 10. The canister is preferably located partially above the lower most portion (20a.) of the fuel tank (20) while viewed from side view of vehicle. It is preferred that the canister 50 does not extend beyond the width of the fuel tank 20. The canister 50 above the engine 30.
This location is suitable for a motorcycle 100 having full fairing 70. The fitment of fairing 70 requires a mounting arrangement, such as brackets, at the front end of frame structure 10. Consequently, less space is available at the front end of the frame structure 10. Therefore, it is difficult to place the canister 50 at the front end of front frame structure 10. In such situation, the distal location of canister 50 from front end or from head pipe 18 is suitable because there is space available for mounting the canister 50. Therefore, the canister 50 can be mounted behind the fairing 70 mounted on the frame structure 10.
On each side of the frame structure 10, the upper member 12a of the front portion 10a of the frame structure 10 is connected to the upper member 12b of the rear portion 10b of the frame structure 10 by means of a connecting member 19. The canister 50 is located substantially in the vicinity of joining location of the connecting member 19 and upper member 12a of front frame structure 10a. The canister 50 is positioned rearward from the joining location. The canister 50 is substantially parallel to the connecting member 19.
The lengths of the inlet conduit 24 and the outlet conduit 26 are further optimised in the second embodiment.
An inlet conduit 24 connects the canister inlet 54 to a breather attached to the fuel tank 20. Fuel vapours in the fuel tank 20 pass through the breather and the inlet conduit 24 into the canister 50. An outlet conduit 26 delivers fuel collected in the canister 50 from the canister outlet 56 to the engine 30. The canister inlet 24 and the canister outlet 26 are located at a front end of the canister 50. An air suction passage 27 is located at a rear end of the canister. The canister is mounted such that the front end having the inlet 24 and outlet 26 is at an elevated position relative to the rear end having the air suction passage 27.
Alternatively the inlet conduit 24 (as shown in figure 14) may be connected canister inlet through connector, preferably Y shape connector (94) .A a drain pipe 96 being connected to the said connector. Preferably the connector is between tank and canister to collect liquid petrol during condensation of vapours in the EVAP circuit and liquid flow in case of vehicle fall.
This also helps not to pass condensed fuel into the canister which may deteriorate function of canister.
Referring to figure 9, an air filter 40 is located rear to the engine 30 and the throttle body. The air filter 40 is located above the muffler and ahead of the rear shock absorber. The canister 50 is ahead of the air filter 40.
ALTERNATIVE EMBODIMENTS
The canister 50 could readily be attached to the right hand side of the frame structure 10. The side chosen would depend on the components of the existing motorcycle, the positioning of those components and the space availability on any given side.
Furthermore, the canister 50 may be oriented at a different angle such as parallel or perpendicular to the upper member 12a, the lower member 14a or the cross member 16a.
The canister 50 could be located behind the fuel tank 20. This arrangement may have an implication that the fuel tank cover 22 needs to extend rearward to hide the canister 50.
In a further alternative embodiment, the upper frame member 12a, the lower frame member 14a or the cross member 16a is recessed to receive the canister 50. If the frame members 12a, 14a, 16a are tubular, they may be dented to create said recess.
Alternatively, the canister 50 may have a recess in order to receive a frame member 12a, 14a, 16a.
Referring to figure 10, which depicts two alternative positions of canister in the same drawing, though each involves the use of only a single canister 50. The canister 50 is located below the seat 80. The canister 50 is located above the rear wheel 75. Difference between the two alternatives: the canister 50 may either be located proximate to the rear shock absorber 90 or distal to the rear shock absorber 90. When the canister 50 is mounted proximate to the rear shock absorber 90, the canister 50 is mounted on the extension members 95 meant for mounting the rear footrests. Whereas, when the canister 50 is located distal to the rear shock absorber 90, the canister 50 is mounted underneath the rear mud guard portion 85. These locations are particularly useful for motorcycles which do not have a fuel tank cover or a fairing to conceal the canister 50 but may get damaged during rear wheel full bump condition, so it needs to comprise with suspension system to avoid such damages.
As detailed above, the invention as described above relates to a motorcycle having a frame structure, a head pipe being connected at a front end of the frame structure, a fuel tank mounted on said frame structure, and a canister for adsorbing fuel vapours generated in the fuel tank and delivering the fuel vapours to an engine mounted on the frame structure. The canister as per the invention may be mounted at one of the two ends of the front portion of frame structure such that at least a portion of the canister is located rearward of the head pipe.
As illustrated and described above, in one of the embodiment the motorcycle may have a frame which is trellis type frame structure including an upper member on either side, a lower member located below each of the upper members, and at least one cross member on either side connecting the upper member of a side to the lower member of the same side, a front portion of the frame structure extends rearward and downward from the head pipe, and a rear portion extending from the front portion. In this arrangement the canister is mounted on one of the members of said front end of front portion of the frame structure of the motorcycle.
As illustrated and described above, in another embodiment the motorcycle may have a frame structure including a trellis type frame structure including an upper member on either side, a lower member located below each of the upper members, and at least one cross member on either side connecting the upper member of a side to the lower member of the same side, a head pipe being connected at a front end of the frame structure such that a front portion of the frame structure extends rearward and downward from the head pipe and a rear portion of the frame structure extending from said front portion of the frame structure, and a canister for adsorbing fuel vapours generated in a fuel tank mounted on the frame structure and delivering the fuel vapours to an engine mounted on the frame structure. In this arrangement the canister is mounted on the frame structure and located at distal end of the front portion of the frame structure.
The canister 50 according to the present invention may be located on a motorcycle having a frame structure other than a trellis type frame structure as detailed above and is not restricted to trellis type of frame structure.
Although the invention has been described in the above in connection with preferred embodiments of the invention, it will be evident for a person skilled in the art that several modifications are conceivable without departing from the invention as defined by the following claims. ,CLAIMS:1. A motorcycle including:
a frame structure,
a head pipe being connected at a front end of the frame structure,
a fuel tank mounted on said frame structure, and
a canister for adsorbing fuel vapours generated in the fuel tank and delivering the fuel vapours to an engine mounted on the frame structure,
wherein the canister is mounted at one of the two ends of the front portion of frame structure such that at least a portion of the canister is located rearward of the head pipe.
2. The motorcycle as claimed in claim 1, wherein the canister is located proximate the front end of the frame structure and at least a portion of the canister is located forward of the fuel tank.
3. The motorcycle as claimed in claim 1, wherein the canister is located nearer to the head pipe than the engine.
4. The motorcycle as claimed in claim 1, wherein the canister is located forward of the fuel tank and away from cylinder of the engine ..
5. The motorcycle as claimed in claim 1, wherein the canister is located on the outer side of the frame structure.
6. The motorcycle as claimed in claim 1, wherein the fuel tank has a width measured in a transverse direction of motorcycle, and wherein the canister does not extend beyond the width of the fuel tank.
7. The motorcycle as claimed in claim 1, including a cover for at least partially covering the said canister.
8. The motorcycle as claimed in claim 7, wherein the cover is a fuel tank cover.
9. The motorcycle as claimed in claim 1, wherein the canister is mounted on to the frame structure by a fastening means including an attachment means mountable on or connectable to the frame structure and a clamping means for clamping the canister to the attachment means.

10. The motorcycle as claimed in claim 9, wherein the clamping means is at least one resilient strap.
11. The motorcycle as claimed in claim 1, wherein the canister is mounted such that a front end of the canister having an inlet and an outlet is elevated from a rear end of the canister.
12. The motorcycle as claimed in claim 11, wherein the canister is mounted substantially upright.
13. The motorcycle as claimed in claim 11 and 12 wherein the canister inlet connected to an inlet conduit through a connector, preferably a ‘Y’ shape connector ;said connector being connected to drain pipe .
14. The motorcycle as claimed in claim 1, wherein the frame structure is a trellis type frame structure including:
an upper member on either side,
a lower member located below each of the upper members, and
at least one cross member on either side connecting the upper member of a side to the lower member of the same side,
a front portion of the frame structure extends rearward and downward from the head pipe, and a rear portion extending from the front portion.
Where in the canister is mounted on one of the members of said front end of front portion of the frame structure of the motorcycle
15. The motorcycle as claimed in claim 14, wherein the canister is mounted on one of the upper members of said front portion of the frame structure of the motorcycle
16. The motorcycle as claimed claim 14 & 15, wherein the canister is mounted on the left hand side upper member.
17. The motorcycle as claimed in claim 14, wherein the canister is mounted on the at least one cross member.
18. The motorcycle as claimed in claim 14, wherein the canister is located above the lower member.
19. The motorcycle as claimed in claim 14 to 16, wherein at least a portion of the canister is located below the upper member.

20. The motorcycle as claimed in claim 1 including:
a trellis type frame structure including an upper member on either side, a lower member located below each of the upper members, and at least one cross member on either side connecting the upper member of a side to the lower member of the same side,
a head pipe being connected at a front end of the frame structure such that a front portion of the frame structure extends rearward and downward from the head pipe and a rear portion of the frame structure extending from said front portion of the frame structure, and
a canister for adsorbing fuel vapours generated in a fuel tank mounted on the frame structure and delivering the fuel vapours to an engine mounted on the frame structure,
wherein the canister is mounted on the frame structure and located at distal end of the front portion of the frame structure.
21. The motorcycle as claimed in claim 20, wherein the trellis type frame structure includes a connecting member connecting the upper member of said front portion of the frame structure of one side to the upper member of said rear portion of the frame structure of the same side, wherein the canister is located proximate to a joining of the connecting member and the upper member of said front portion of the frame structure.
22. The motorcycle as claimed in claim 21, wherein the canister is located rearward to the joining of said upper member and the connecting member.
23. The motorcycle as claimed in claims 20 to 21, wherein the canister is located on front portion of the frame structure.
24. The motorcycle as claimed in claims 20 to 23, wherein the canister is mounted such that canister having an inlet and an outlet is elevated from a rear end of the canister and are located above the lower most portion of the fuel tank.
25. The motorcycle as claimed in claim 24 wherein said canister inlet connected to an inlet conduit through a connector, preferably a ‘Y’ shape connector ;said connector being connected to drain pipe;

26. The motorcycle as claimed in claims 20 to 24, including a cover for at least partially covering the canister.
27. The motorcycle as claimed in claim 26, wherein the cover is a fairing.