Canister

Abstract

To provide a canister capable of improving appearance of a vehicle without inhibiting a function of recovering boil-off gas.SOLUTION: A canister recovers boil-off gas of a fuel tank and introduces it into an intake passage. The canister includes a cylindrical canister case (52) having an atmosphere release nipple (53) formed on one end surface, and a cap (81) attached in such a manner of covering the one end surface of the canister case. An opening (86) is formed in the cap so as to communicate the inside of the atmosphere release nipple with the atmosphere.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a canister.

Background Art

[0002] As a straddle-type vehicle, one equipped with a canister for treating evaporated fuel from a fuel tank is known (see, for example, Patent Document 1). In the straddle-type vehicle described in Patent Document 1, an air cleaner is connected to the rear of the engine via a throttle body or the like, and a cylindrical canister is arranged on the side of the throttle body in front of the air cleaner. One end of the canister is connected to a surge hose extending from the fuel tank and a purge hose extending from the throttle body. Evaporated fuel from the fuel tank is adsorbed by the canister, and the evaporated fuel is introduced from the canister to the throttle body for reburning.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] An air release nipple communicating with the atmosphere is provided at the other end of the canister. However, if the straddle-type vehicle is not entirely covered with fitting parts, depending on the location of the canister, the air release nipple may be exposed, deteriorating the vehicle appearance.

[0005] The present invention has been made in view of this point, and an object thereof is to provide a canister capable of improving the appearance of a vehicle without inhibiting the function of recovering evaporated gas.

Means for Solving the Problems

[0006] The canister according to one aspect of the present invention is a canister that recovers evaporated fuel from a fuel tank and introduces it into an intake passage, and includes a cylindrical canister case having an atmosphere release nipple formed on one end surface, and a cap attached so as to cover one end surface of the canister case. An opening is formed in the cap to communicate the inside of the atmosphere release nipple with the atmosphere. , on the inner surface of the cap inside the outer peripheral portion of the cap, a peripheral wall is formed that surrounds the periphery except for a part of the atmosphere release nipple This solves the above problems.

Advantages of the Invention

[0007] According to the canister of one aspect of the present invention, the atmosphere release nipple is hidden by the cap, and the canister is made less conspicuous by the cap, improving the appearance of the vehicle. Further, since the inside of the atmosphere release nipple is connected to the atmosphere through the opening, the performance of the canister is not inhibited by the cap.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Modes for Carrying Out the Invention

[0009] A canister according to one aspect of the present invention recovers evaporated fuel from a fuel tank and introduces it into an intake passage. An atmosphere release nipple is formed on one end face of a canister case of the canister, and a cap is attached so as to cover this one end face of the canister case. An opening is formed in the cap to communicate the inside of the atmosphere release nipple with the atmosphere. The atmosphere release nipple is hidden by the cap, and the canister is made less conspicuous by the cap, improving the appearance of the vehicle. Also, since the inside of the atmosphere release nipple is connected to the atmosphere through the opening, the performance of the canister is not inhibited by the cap.

Embodiment

[0010] Hereinafter, this embodiment will be described in detail with reference to the accompanying drawings. FIG. 1 is a left side view of the saddle-type vehicle of this embodiment. Also, in the following figures, arrow FR indicates the front of the vehicle, arrow RE indicates the rear of the vehicle, arrow L indicates the left side of the vehicle, and arrow R indicates the right side of the vehicle.

[0011] As shown in FIG. 1, the saddle-type vehicle 1 is configured by mounting various components such as an engine 30 and an electrical system on a diamond-shaped vehicle body frame 10 formed of pipes and sheet metal. The vehicle body frame 10 has a pair of main frames 12 that branch left and right from a head pipe 11 and extend rearward, and a pair of down frames 13 that branch left and right from the head pipe 11 and extend downward. The rear part of the engine 30 is supported by the pair of main frames 12, and the front part of the engine 30 is supported by the pair of down frames 13. By supporting the engine 30 on the vehicle body frame 10, the rigidity of the entire vehicle is improved.

[0012] The front portion of the main frame 12 is a tank rail 14 positioned above the engine 30, and the fuel tank 21 is supported from below by the tank rail 14. The rear portion of the main frame 12 is a body frame 15 positioned behind the engine 30, and a swing arm 22 is swingably supported at the lower half of the body frame 15. A seat rail 16 composed of an upper rail 17 and a lower rail 18 is attached to the upper half of the body frame 15. The rider seat 23 and the pillion seat 24 are supported above the upper rail 17 behind the fuel tank 21.

[0013] A pair of front forks 25 are steerably supported on the head pipe 11 via a steering shaft (not shown), and a front wheel 26 is rotatably supported at the lower part of the front forks 25. The swing arm 22 extends rearward from the body frame 15, and a rear wheel 27 is rotatably supported at the rear end of the swing arm 22. The engine 30 is connected to the rear wheel 27 via a chain drive type transmission mechanism, and the power from the engine 30 is transmitted to the rear wheel 27 via the transmission mechanism. Further, a side stand 28 for tilting and standing the vehicle upright is provided at the lower part of the left body frame 15.

[0014] By the way, in models equipped with a canister 51 that processes the evaporated fuel from the fuel tank 21, if the entire vehicle is not covered with fitting parts, depending on the location of the canister 51, the hoses and nipples of the canister 51 may be exposed, deteriorating the appearance of the vehicle. Further, an air release nipple is formed on the end face of the canister 51, and depending on the location of the canister 51, foreign substances such as water and dust may enter the inside of the canister 51 from the air release nipple. Therefore, in this embodiment, the end face of the canister 51 on which the air release nipple is formed is covered with a cap 81, and an opening for connecting the air release nipple to the atmosphere is formed in the cap 81 to maintain the function of the canister 51 (see FIG. 6).

[0015] Referring to FIGS. 2 and 3, the peripheral configuration of the engine will be described. FIG. 2 is a perspective view of the engine periphery as seen from the right side in this embodiment. FIG. 3 is a perspective view of the engine periphery as seen from the left side in this embodiment.

[0016] As shown in FIGS. 2 and 3, the engine 30 is a two-cylinder engine and has a crankcase 31 with an upper and lower split structure. A cylinder 32, a cylinder head 33, and a cylinder head cover 34 are attached to the upper part of the crankcase 31. A magnet cover 35 that covers a magnet (not shown) from the side is attached to the left side surface of the crankcase 31. A clutch cover 36 that covers a clutch (not shown) from the side is attached to the right side surface of the crankcase 31. A throttle body 41 is connected to the rear surface of the cylinder head 33 via a pair of intake pipes 37.

[0017] An air cleaner 38 (see FIG. 1) is connected upstream (rear side) of the throttle body 41. The air cleaner 38 is disposed between a pair of seat rails 16 (see FIG. 1) and is inclined obliquely downward to the rear. Upstream sides of a pair of intake passages 89 are formed inside the throttle body 41, and downstream sides of the pair of intake passages 89 are formed inside the pair of intake pipes 37. The throttle body 41 and the pair of intake pipes 37 form the pair of intake passages 89, and air is introduced from the air cleaner 38 into the pair of intake ports of the cylinder head 33 through the pair of intake passages 89.

[0018] The throttle body 41 has a pair of cylindrical portions 42 that connect a pair of intake pipes 37 and a pair of outlet tubes (not shown) of the air cleaner 38. A pair of electronically controlled throttle valves 43 are disposed in the intake passages 89 of the pair of cylindrical portions 42. The pair of throttle valves 43 are attached to a shaft (not shown) that penetrates the pair of cylindrical portions 42, and a drive motor 44 is connected to the right end side of this shaft. The drive motor 44 drives the pair of throttle valves 43 to open and close, thereby adjusting the amount of intake air flowing from the air cleaner 38 toward the cylinder head 33.

[0019] The drive motor 44 includes a motor body 45 that outputs a driving force, and a gear case 46 that houses a transmission gear for transmitting the output of the motor body 45 to a shaft. The motor body 45 is continuous with the lower part of the right cylindrical portion 42, and the gear case 46 is continuous with the right cylindrical portion 42 and the right side (one side in the vehicle width direction) of the motor body 45. The motor body 45 is located below the intake passage 89, and the lower end of the gear case 46 is located below the motor body 45. In this way, the right side of the throttle body 41 and the right side of the space below the throttle body 41 are the arrangement spaces for the gear case 46 and the motor body 45.

[0020] A purge pipe 47 having a U-shaped cross section when viewed from the rear is connected to the lower surfaces of the pair of cylindrical portions 42. A purge hose 62 extending from a canister 51 described later is connected to the purge pipe 47. A pair of injectors 48 are attached to the upper surfaces of the pair of cylindrical portions 42, and a delivery pipe 49 is connected to the pair of injectors 48. The pair of injectors 48 penetrate the cylindrical portion 42, and the pair of injectors 48 are inclined so as to face obliquely downward forward. Fuel is supplied from the delivery pipe 49 to the pair of injectors 48, and the fuel is injected from the pair of injectors 48 toward a pair of intake ports (not shown) downstream of the pair of intake pipes 37.

[0021] A canister 51 for collecting the evaporated fuel of the fuel tank 21 (see FIG. 1) is disposed below the throttle body 41. A cap 81 is attached so as to cover the right end surface (one end surface) of the canister 51, and a surge hose 61 and a purge hose 62 are connected to the left end surface (the other end surface) of the canister 51. The canister 51 is connected to the fuel tank 21 via the surge hose 61, and the canister 51 is connected to the purge pipe 47 via the purge hose 62. The evaporated fuel of the fuel tank 21 is collected in the canister 51 through the surge hose 61, and is introduced into the intake passage 89 through the purge hose 62 and the purge pipe 47.

[0022] The purge hose 62 has a first purge hose 63 and a second purge hose 64. The first purge hose 63 connects the canister 51 and the purge valve 71, and the second purge hose 64 connects the purge valve 71 and the purge pipe 47. The opening and closing of the purge valve 71 adjusts the purge flow rate of the evaporated fuel from the canister 51 to the intake passage 89 of the throttle valve 43. Further, a rubber band 57 is attached to the outer peripheral surface of the canister 51, and a canister bracket 65 is inserted into the rubber band 57. The canister 51 is fixed to a frame member (not shown) in a floating state via the canister bracket 65.

[0023] Referring to FIGS. 4 to 7, the canister will be described. FIG. 4 is a perspective view of the canister of the present embodiment as viewed from the right side. FIG. 5 is a perspective view of the canister of the present embodiment as viewed from the left side. FIG. 6 is a cross-sectional view of the cap and the canister of the present embodiment. FIG. 7 is a perspective view of the cap of the present embodiment. Note that FIG. 4(A) shows a state in which the cap is attached to the canister, and FIG. 4(B) shows a state in which the cap is removed from the canister.

[0024] As shown in FIGS. 4 and 5, the canister 51 has a resin-made canister case 52 in which an adsorption chamber is formed. The adsorption chamber of the canister case 52 houses activated carbon or the like that can temporarily adsorb the evaporated fuel. An atmosphere release nipple 53 connected to the atmosphere and a drain nipple 54 for discharging moisture and fuel in the adsorption chamber are formed on the right end surface (one end surface) of the canister case 52. The atmosphere release nipple 53 is located at the center of the end surface, and the drain nipple 54 is located below the atmosphere release nipple 53. A rubber-made cap 81 is attached to the canister case 52 so as to cover the right end surface.

[0025] On the left end face (other end face) of the canister case 52, a surge nipple 55 to which a surge hose 61 (see FIG. 3) is connected and a purge nipple 56 to which a purge hose 62 (see FIG. 3) is connected are formed. The fuel tank 21 (see FIG. 1) is connected to the surge nipple 55 via the surge hose 61, and the intake passage 89 (see FIG. 3) is connected to the purge nipple 56 via the purge hose 62 (see FIG. 3). The surge nipple 55 is located at the center of the end face, and the purge nipple 56 is located above the surge nipple 55. Thus, a plurality of nipples are formed at both the left and right ends of the canister case 52.

[0026] A rubber band 57 is attached to the center of the outer peripheral surface of the canister case 52 in the longitudinal direction. The upper and lower portions of the rubber band 57 are attachment portions 58 to which the canister bracket 65 is attached, and flat holes are formed in the attachment portions 58. A recess 59 is formed in the portion protruding rightward from the upper attachment portion 58, and the convex portion 82 of the cap 81 fits into this recess 59, positioning the cap 81 in the circumferential direction with respect to the rubber band 57. Also, due to the pressing force of the rubber band 57, the rubber band 57 and the canister case 52 are in close contact, preventing circumferential displacement of the rubber band 57 with respect to the canister case 52.

[0027] The canister bracket 65 has a fixing bracket 66 fixed to the frame member and a C-shaped bracket 69 attached to the rubber band 57. The fixing bracket 66 has a right lower piece portion 67 bent downward and a left upper piece portion 68 bent upward. The middle portion of the C-shaped bracket 69 is joined to the lower piece portion 67 of the fixing bracket 66, and both ends of the C-shaped bracket 69 are inserted into the flat holes of the upper and lower attachment portions 58 of the rubber band 57. Engine vibration is transmitted from the frame member to the canister bracket 65, but the rubber band 57 absorbs the engine vibration, making it difficult for the vibration to be transmitted to the canister 51.

[0028] The drive part 72 of the purge valve 71 is fixed to the upper piece part 68 of the fixed bracket 66. The purge valve 71 is positioned to the left of the rubber band 57, and the purge valve 71 and the purge nipple 56 are brought closer. A valve case 73 is provided on the left side surface of the drive part 72, and a valve (not shown) is accommodated in the valve case 73. The drive part 72 is constituted by a solenoid, a motor, or the like, and the valve in the valve case 73 is driven by the drive part 72. A connector 74 is provided on the front surface of the drive part 72, and a control unit (not shown) is connected to the connector 74 through a cable (not shown).

[0029] An introduction nipple 75 is formed at the tip side of the valve case 73, and a discharge nipple 76 is formed at the base end side of the valve case 73. The purge nipple 56 of the canister 51 is connected to the introduction nipple 75 via the first purge hose 63, and the purge pipe 47 (see FIG. 3) of the throttle body 41 is connected to the discharge nipple 76 via the second purge hose 64. The introduction nipple 75 and the discharge nipple 76 extend forward from the valve case 73 and are brought closer to the purge nipple 56 and the purge pipe 47. Thereby, the first and second purge hoses 63 and 64 can be made short.

[0030] As shown in FIGS. 6 and 7, a dome-shaped cap 81 is attached to the right end face side of the canister case 52, and the atmosphere release nipple 53 and the drain nipple 54 are covered by the cap 81. The apex portion of the cap 81 faces the atmosphere release nipple 53, and the portion below the apex portion of the cap 81 faces the drain nipple 54. A pair of notches 83 are formed in the outer peripheral portion of the cap 81, and the outer peripheral portion of the cap 81 is made easily deformable by the pair of notches 83, improving the mountability of the cap 81 to the canister case 52. The positioning convex portion 82 described above is formed in the outer peripheral portion above the cap 81.

[0031] On the inner surface of the cap 81, a U-shaped wall (peripheral wall) 84 is formed that surrounds the periphery except for the lower part of the atmosphere release nipple 53. Below the U-shaped wall 84, an insertion hole (sealing portion) 85 is formed that covers the outlet of the drain nipple 54. By sealing the drain nipple 54 with the insertion hole 85, it becomes difficult for fuel to leak from the outlet of the drain nipple 54, preventing contamination of the components. In a general canister, fuel leaked from the canister case is led through a drain hose to a position where the components are not contaminated. However, in the canister 51 of this embodiment, since the cap 81 is attached, the drain hose becomes unnecessary, reducing the number of components.

[0032] Below the insertion hole 85, an opening 86 is formed that communicates the inside of the cap 81 with the atmosphere. The opening 86 is formed in an arc shape along the outer peripheral portion of the cap 81. Since the inside of the atmosphere release nipple 53 communicates with the inside of the cap 81 through the open portion below the U-shaped wall 84, the inside of the atmosphere release nipple 53 communicates with the atmosphere through the opening 86. Even if the atmosphere release nipple 53 and the drain nipple 54 are hidden by the cap 81 for improving the appearance, the performance of the canister 51 is not inhibited by the cap 81 because the inside of the atmosphere release nipple 53 is connected to the atmosphere through the opening 86.

[0033] Since the atmosphere release nipple 53 communicates with the atmosphere, various measures are taken in the cap 81 to make it difficult for foreign substances such as water and dust to enter the inside of the atmosphere release nipple 53. For example, the opening 86 is closer to the right end surface of the canister case 52 than the insertion port 87 of the insertion hole 85 (see particularly FIG. 6). Also, on the upper part of the insertion hole 85, a protruding wall 88 is formed that is larger than the length of the opening 86 and larger than the lateral width of the U-shaped wall 84. By positioning the base end portion of the drain nipple 54 and the protruding wall 88 between the opening 86 and the atmosphere release nipple 53, the intrusion of foreign substances from the opening 86 into the atmosphere release nipple 53 is suppressed.

[0034] Furthermore, a pair of notches 83 are formed on the outer peripheral portion of the cap 81 on the sides of the U-shaped wall 84. Even if foreign matter enters the cap 81 from the pair of notches 83, since the U-shaped wall 84 surrounds the periphery of the atmosphere release nipple 53 except for the lower part, the intrusion of foreign matter from the pair of notches 83 into the atmosphere release nipple 53 is suppressed. At this time, since the open surface (lower surface) of the U-shaped wall 84 is positioned below the lower ends of the pair of notches 83, the direct intrusion of foreign matter from the pair of notches 83 into the atmosphere release nipple 53 is suppressed. By attaching the cap 81 to the canister 51, the placement location of the canister 51 is not restricted by the appearance or the ease of entry of foreign matter.

[0035] With reference to FIGS. 8 to 10, the layout of the canister will be described. FIG. 8 is a right side view of the periphery of the engine of the present embodiment. FIG. 9 is a top view of the engine and the canister of the present embodiment. FIG. 10 is a rear view of the engine and the canister of the present embodiment.

[0036] As shown in FIG. 8, the cylinder axis of the engine 30 is vertical, and the crankcase 31 at the lower part of the engine 30 extends rearward. The cylinder head 33 is supported by the tank rail 14 of the main frame 12, and the crankcase 31 is supported by the body frame 15 of the main frame 12. The throttle body 41 and the canister 51 are arranged in the space behind the cylinder surrounded by the engine 30 and the main frame 12 in a side view. The throttle body 41 is arranged near the upper front of the space behind the cylinder, and the canister 51 is arranged near the lower rear of this space.

[0037] The drive motor 44 of the throttle body 41 extends obliquely rearward and downward, and the cap 81 of the canister 51 is disposed in a space surrounded by the drive motor 44, the main frame 12, and the crankcase 31. At this time, in a side view, the upper end P1 of the canister 51 is positioned above the lower end P2 of the drive motor 44, and the front end P3 of the canister 51 is positioned in front of the rear end P4 of the drive motor 44. The canister 51 is brought closer to the drive motor 44 in the vertical and front-rear directions, and the throttle body 41 and the canister 51 are compactly arranged, thereby suppressing an increase in the size of the vehicle.

[0038] Also, a part of the canister 51, that is, a part of the cap 81 overlaps the crankcase 31 and the clutch cover 36. The gap between the cap 81 and the crankcase 31 is packed so as to contact with engine vibration, but the gap between the cap 81 and the drive motor 44 is secured so as not to contact even with engine vibration. Even if the canister 51 contacts the crankcase 31 due to engine vibration, the canister 51 is protected from impact by the rubber cap 81. The canister 51 is brought closer to the crankcase 31 in the vertical direction, and the canister 51 is compactly arranged above the crankcase 31, thereby suppressing an increase in the size of the vehicle.

[0039] As shown in FIG. 9, in a top view, the right end surface (one end surface) of the canister 51 is positioned closer to the vehicle width direction inside than the drive motor 44, and the overall length of the canister 51 is formed shorter than the overall length of the throttle body 41. The canister 51 is brought closer to the drive motor 44 in the vehicle width direction, and the drive motor 44 and the canister 51 are compactly arranged, thereby suppressing an increase in the size of the vehicle. The center position O in the longitudinal direction of the canister 51 is biased closer to the right than the center plane C of the engine 30, and a layout space for the surge hose 61 and the purge hose 62 is secured on the left side of the canister 51.

[0040] As shown in FIGS. 9 and 10, the surge hose 61 extends upward from the left end face of the canister 51 through the left side of the throttle body 41, and then extends rearward toward the exhaust port of the fuel tank 21 (see FIG. 1). The first purge hose 63 extends from the left end face of the canister 51 toward the purge valve 71 at the upper part of the canister 51. At this time, in a top view, the first purge hose 63 is accommodated within the front-rear width W of the canister 51. The second purge hose 64 extends back and forth from the purge valve 71 toward the purge pipe 47 of the throttle body 41. In a side view, the second purge hose 64 overlaps with the drive motor 44 (see FIG. 8).

[0041] In this way, the drive motor 44 of the throttle body 41 is provided on the right side of the center plane C of the engine 30, and the routing routes of the surge hose 61 and the purge hose 62 are secured on the left side of the center plane C of the engine 30. Since the surge hose 61 and the purge hose 62 do not come into contact with the drive motor 44 due to vehicle vibration, the canister 51 can be brought closer to the drive motor 44, suppressing the enlargement of the vehicle. The routing routes of the surge hose 61 and the purge hose 62 are not obstructed by the drive motor 44, and the surge hose 61 and the purge hose 62 extending from the canister 51 can be shortened.

[0042] In a rear view, the atmosphere release nipple 53 on the right end face of the canister 51 is located below the drive motor 44. More specifically, the upper part of the canister 51 overlaps with the motor body 45, and the atmosphere release nipple 53 is located below the gear case 46 (see particularly FIG. 10). The tip of the atmosphere release nipple 53 is located inside the vehicle relative to the outer end of the gear case 46. A drain nipple 54 (see FIG. 4(B)) is also formed on the right end face of the canister 51. Since no hoses are connected to the atmosphere release nipple 53 and the drain nipple 54, the canister 51 is brought closer to the drive motor 44 with a gap that prevents contact between the drive motor 44 and the canister 51.

[0043] The cap 81 of the canister 51 is located on the side opposite to the left-side stand 28 (see FIG. 1). Since the vehicle stands independently in a posture tilted to the left by the side stand 28, the left end face of the canister 51 faces downward, making the surge hose 61 and the surge hose 61 less conspicuous. The right end face of the canister 51 faces upward, but the atmosphere release nipple 53 on the right end face of the canister 51 is covered by the cap 81, suppressing a decrease in appearance due to the exposure of the atmosphere release nipple 53. The main frame 12 is located above the cap 81, and the cap 81 itself is also covered from above by the main frame 12, making the cap 81 less conspicuous and suppressing a decrease in the appearance of the vehicle.

[0044] As described above, according to the present embodiment, the atmosphere release nipple 53 is hidden by the cap 81, and the canister 51 is made less conspicuous by the cap 81, improving the appearance of the vehicle. Further, since the inside of the atmosphere release nipple 53 is connected to the atmosphere through the opening 86, the performance of the canister 51 is not inhibited by the cap 81.

[0045] In this embodiment, a two-cylinder engine is exemplified as the engine, but the type of the engine is not particularly limited.

[0046] Also, in this embodiment, the surge nipple and the purge nipple are formed on the left side of the canister, and the drive motor is provided on the right side of the throttle body. However, the surge nipple and the purge nipple may be formed on the right side of the canister, and the drive motor may be provided on the left side of the throttle body.

[0047] Also, in this embodiment, the atmosphere release nipple and the drain nipple are formed on the right side of the canister. However, the atmosphere release nipple and the drain nipple may be formed on the left side of the canister. The canister may not have a drain nipple formed thereon.

[0048] Also, in this embodiment, the opening of the cap is formed in an arc shape, but the opening is not particularly limited as long as it can communicate the inside of the atmosphere release nipple with the atmosphere.

[0049] In addition, in this embodiment, a U-shaped wall with an open bottom is exemplified as the peripheral wall of the cap. However, the peripheral wall may be formed to surround the periphery except for a part of the atmosphere-release nipple.

[0050] In addition, in this embodiment, an insertion hole is exemplified as the sealing portion of the cap. However, the sealing portion is not particularly limited as long as it can cover the outlet of the drain nipple.

[0051] In addition, in this embodiment, the opening of the cap is provided below the insertion hole. However, as long as the opening can communicate the inside of the atmosphere-release nipple with the atmosphere, the positional relationship between the opening of the cap and the insertion hole is not particularly limited.

[0052] In addition, in this embodiment, the lower part of the cap overlaps the crankcase in a side view. However, the cap and the crankcase do not have to overlap.

[0053] In addition, in this embodiment, the cap is provided on the side opposite to the side stand. However, the cap may be provided on the same side as the side stand. For example, the side stand and the cap may be provided on the left side.

[0054] In addition, the canister is not limited to the illustrated saddle-type vehicle, and may be adopted in other types of saddle-type vehicles. The saddle-type vehicle is not limited to all vehicles in which the rider rides in a posture straddling the seat, and also includes small scooter-type vehicles in which the rider rides without straddling the seat.

[0055] As described above, the canister (51) of this embodiment is a canister that recovers the evaporated fuel from the fuel tank (21) and introduces it into the intake passage (89). It includes a cylindrical canister case (52) having an atmospheric vent nipple (53) formed on one end face, and a cap (81) mounted so as to cover one end face of the canister case. An opening (86) is formed in the cap to communicate the inside of the atmospheric vent nipple with the atmosphere. According to this configuration, the atmospheric vent nipple is hidden by the cap, and the canister becomes less conspicuous due to the cap, improving the appearance of the vehicle. Also, since the inside of the atmospheric vent nipple is connected to the atmosphere through the opening, the performance of the canister is not inhibited by the cap.

[0056] In the canister of this embodiment, a peripheral wall (U-shaped wall 84) that surrounds the periphery except for a part of the atmospheric vent nipple is formed on the cap. According to this configuration, even if an opening is formed in the cap, it is difficult for foreign substances such as dust and water to enter the atmospheric vent nipple, and the performance of the canister is maintained.

[0057] In the canister of this embodiment, the peripheral wall surrounds the periphery except for the lower part of the atmospheric vent nipple, and a notch (83) for mounting to the canister case is formed on the side of the peripheral wall of the cap. According to this configuration, even if a notch is formed in the cap, it is difficult for foreign substances to enter the atmospheric vent nipple, and the performance of the canister is maintained.

[0058] In the canister of this embodiment, a drain nipple (54) is formed on one end face of the canister case, and a sealing portion (insertion hole 85) that covers the outlet of the drain nipple is formed on the cap. According to this configuration, it is difficult for fuel to leak from the outlet of the drain nipple, preventing contamination of the parts. Also, the drain hose becomes unnecessary, and the number of parts can be reduced.

[0059] In the canister of this embodiment, the opening is formed below the sealing portion and on one end face side of the canister case with respect to the sealing portion. According to this configuration, the drain nipple serves as a wall, making it difficult for foreign matter to enter the atmosphere release nipple from the opening, and maintaining the performance of the canister.

[0060] In the canister of this embodiment, an air cleaner (38) is arranged behind the engine (30), air is guided from the air cleaner to the engine, the cap is made of rubber, and a part of the cap overlaps the crankcase (31) of the engine in a side view. According to this configuration, the canister is arranged in a narrow space behind the engine. Even if the canister contacts the crankcase due to engine vibration, the rubber cap protects the canister from impact. Therefore, the canister can be brought closer to the crankcase, suppressing the enlargement of the vehicle.

[0061] In the canister of this embodiment, a pair of main frames (12) extend rearward from the head pipe. A side stand (28) is attached to one of the main frames. The other main frame is located above the cap, and the cap is located on the side opposite to the side stand. According to this configuration, when the vehicle is tilted during the use of the side stand, one end face of the canister is directed upward rather than the other end face of the canister. The atmosphere release nipple on one end face of the canister is covered by the cap, suppressing a decrease in appearance due to the exposure of the atmosphere release nipple. Furthermore, the cap itself is also covered by the main frame from above, making it less conspicuous and not impairing the appearance of the vehicle.

[0062] Although this embodiment has been described, as another embodiment, those obtained by wholly or partially combining the above embodiments and modification examples may also be used.

[0063] Furthermore, the technology of the present invention is not limited to the above embodiments, and various changes, substitutions, and modifications may be made without departing from the spirit of the technical idea. Moreover, if the technical idea can be realized in another way by technological progress or another derived technology, the method may be used for implementation. Therefore, the scope of the claims covers all embodiments that can be included within the scope of the technical idea.

Description of Reference Numerals

[0064] 12: Main frame 21: Fuel tank 28: Side stand 30: Engine 31: Crankcase 38: Air cleaner 51: Canister 52: Canister case 53: Atmosphere release nipple 54: Drain nipple 81: Cap 83: Notch 84: U-shaped wall (peripheral wall) 85: Insertion hole (sealing portion) 86: Opening 89: Intake passage

Claims

1. A canister that recovers evaporated fuel from a fuel tank and introduces it into an intake passage, a cylindrical canister case having an atmospheric vent nipple formed on one end face, and a cap attached so as to cover one end face of the canister case, wherein an opening for communicating the inside of the atmospheric vent nipple with the atmosphere is formed in the cap, and a peripheral wall that surrounds the periphery except for a part of the atmospheric vent nipple is formed on the inner surface of the outer peripheral portion of the cap. A canister characterized by this.

2. The peripheral wall surrounds the periphery except for the lower part of the atmospheric vent nipple, and the canister according to claim 1, wherein a notch for attachment to the canister case is formed on the side of the peripheral wall in the cap.

3. A canister that recovers evaporated fuel from a fuel tank and introduces it into an intake passage, a cylindrical canister case having an atmospheric vent nipple and a drain nipple formed on one end face, and a cap attached so as to cover one end face of the canister case, wherein an opening for communicating the inside of the atmospheric vent nipple with the atmosphere and a sealing portion for covering the outlet of the drain nipple are formed in the cap. A canister characterized by this.

4. The canister according to claim 3, wherein the opening is formed below the sealing portion and on the one end face side of the canister case with respect to the sealing portion.

5. A canister that recovers evaporated fuel from a fuel tank and introduces it into an intake passage, a cylindrical canister case having an atmospheric vent nipple formed on one end face, and a rubber cap attached so as to cover one end face of the canister case, wherein an opening for communicating the inside of the atmospheric vent nipple with the atmosphere is formed in the cap, an air cleaner is disposed behind the engine, and air is guided from the air cleaner to the engine, and a part of the cap overlaps the crankcase of the engine in a side view. A canister characterized by this.

6. A pair of main frames extend rearward from the head pipe, branching left and right, and a side stand is attached to one of the main frames. Another main frame is located above the cap, and the cap is positioned on the side opposite to the side stand with respect to the vehicle in the left-right direction. The canister according to any one of claims 1 to 5, characterized in that.

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