JP7683382B2 - Canister - Google Patents

Description

The present invention relates to a canister.

There is known a saddle-type vehicle equipped with a canister that processes evaporated fuel from a fuel tank (see, for example, Patent Document 1). In the saddle-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 disposed in front of the air cleaner and to the side of the throttle body. A surge hose extending from the fuel tank and a purge hose extending from the throttle body are connected to one end of the canister. 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 re-combustion.

JP 2020-104837 A

The other end of the canister is provided with an atmosphere vent nipple that connects to the atmosphere, but if the saddle-type vehicle is not entirely covered with fittings, the atmosphere vent nipple may be exposed depending on where the canister is positioned, which may result in a poor appearance for the vehicle.

The present invention was made in consideration of these points, and aims to provide a canister that can improve the appearance of the vehicle without impeding the evaporative gas recovery function.

A canister in one embodiment of the present invention is a canister that recovers evaporated fuel from a fuel tank and introduces it into an intake passage, and comprises a cylindrical canister case having an atmosphere vent nipple formed on one end surface, and a cap attached to cover one end surface of the canister case, wherein an opening is formed in the cap that connects the inside of the atmosphere vent nipple to the atmosphere , and a peripheral wall is formed on the inner surface of the cap inside the outer periphery of the cap that surrounds the atmosphere vent nipple except for a portion of it, thereby solving the above-mentioned problem.

According to one aspect of the canister of the present invention, the atmosphere vent nipple is hidden by the cap, making the canister less noticeable and improving the appearance of the vehicle. In addition, because the inside of the atmosphere vent nipple is connected to the atmosphere through the opening, the performance of the canister is not hindered by the cap.

FIG. 2 is a left side view of the saddle-ride type vehicle of the present embodiment. FIG. 2 is a perspective view of the engine periphery of the present embodiment as viewed from the right side. FIG. 2 is a perspective view of the engine periphery of the present embodiment as viewed from the left side. FIG. 2 is a perspective view of the canister of the present embodiment as viewed from the right side. FIG. 2 is a perspective view of the canister according to the embodiment, as viewed from the left side. FIG. 2 is a cross-sectional view of the cap and the canister of the present embodiment. FIG. 2 is a perspective view of the cap of the present embodiment. FIG. 2 is a right side view of the engine and its periphery according to the present embodiment. FIG. 2 is a top view of the engine and the canister according to the embodiment. FIG. 2 is a rear view of the engine and the canister of the embodiment.

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 surface of the canister case of the canister, and a cap is attached to cover the one end surface of the canister case. An opening is formed in the cap that connects the inside of the atmosphere release nipple to the atmosphere. The atmosphere release nipple is hidden by the cap, and the canister is made less noticeable by the cap, improving the appearance of the vehicle. In addition, because the inside of the atmosphere release nipple is connected to the atmosphere through the opening, the performance of the canister is not hindered by the cap.

The present embodiment will be described in detail below with reference to the attached drawings. Figure 1 is a left side view of the saddle-type vehicle of the present embodiment. In addition, in the following drawings, the arrow FR indicates the front of the vehicle, the arrow RE indicates the rear of the vehicle, the arrow L indicates the left side of the vehicle, and the arrow R indicates the right side of the vehicle.

As shown in FIG. 1, the saddle-type vehicle 1 is constructed by mounting an engine 30, an electrical system, and various other components on a diamond-shaped body frame 10 formed from pipes and sheet metal. The body frame 10 has a pair of main frames 12 that branch off to the left and right from a head pipe 11 and extend rearward, and a pair of down frames 13 that branch off to the left and right from the head pipe 11 and extend downward. The pair of main frames 12 support the rear of the engine 30, and the pair of down frames 13 support the front of the engine 30. Supporting the engine 30 on the body frame 10 improves the rigidity of the entire vehicle.

The front portion of the main frame 12 is a tank rail 14 located above the engine 30, and a 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 located behind the engine 30, and a swing arm 22 is supported in a swingable manner on the lower half of the body frame 15. A seat rail 16 consisting of an upper rail 17 and a lower rail 18 is attached to the upper half of the body frame 15. A rider seat 23 and a pillion seat 24 are supported on the upper portion of the upper rail 17 behind the fuel tank 21.

A pair of front forks 25 are supported on the head pipe 11 via a steering shaft (not shown) so as to be steerable, and a front wheel 26 is rotatably supported at the lower part of the front forks 25. A 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. An engine 30 is connected to the rear wheel 27 via a chain drive type transmission mechanism, and power from the engine 30 is transmitted to the rear wheel 27 via the transmission mechanism. In addition, a side stand 28 is provided at the lower part of the left side body frame 15 to tilt the vehicle to stand on its own.

However, in models equipped with a canister 51 that processes evaporated fuel from the fuel tank 21, if the entire vehicle is not covered with fittings, the hose and nipple of the canister 51 will be exposed depending on where the canister 51 is placed, degrading the vehicle's appearance. Also, an atmosphere vent nipple is formed on the end face of the canister 51, and depending on where the canister 51 is placed, foreign matter such as water and dust may enter the inside of the canister 51 through the atmosphere vent nipple. Therefore, in this embodiment, the end face of the canister 51 where the atmosphere vent nipple is formed is covered with a cap 81, and an opening is formed in the cap 81 that connects the atmosphere vent nipple to the atmosphere, maintaining the function of the canister 51 (see Figure 6).

The peripheral configuration of the engine will be described with reference to Figures 2 and 3. Figure 2 is a perspective view of the engine periphery of this embodiment as seen from the right side. Figure 3 is a perspective view of the engine periphery of this embodiment as seen from the left side.

As shown in Figures 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 magneto cover 35 that covers a magneto (not shown) from the side is attached to the left side of the crankcase 31. A clutch cover 36 that covers a clutch (not shown) from the side is attached to the right side 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.

An air cleaner 38 (see FIG. 1) is connected to the 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 tilted diagonally downward toward the rear. The upstream side of a pair of intake passages 89 is formed inside the throttle body 41, and the downstream side of a pair of intake passages 89 is formed inside the pair of intake pipes 37. A pair of intake passages 89 is formed by the throttle body 41 and the pair of intake pipes 37, and air is introduced from the air cleaner 38 through the pair of intake passages 89 into a pair of intake ports in the cylinder head 33.

The throttle body 41 has a pair of cylindrical sections 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 arranged in the intake passage 89 of the pair of cylindrical sections 42. The pair of throttle valves 43 are attached to a shaft (not shown) that passes through the pair of cylindrical sections 42, and a drive motor 44 is connected to the right end of this shaft. The pair of throttle valves 43 are driven to open and close by the drive motor 44, adjusting the amount of intake air flowing from the air cleaner 38 to the cylinder head 33.

The drive motor 44 has a motor body 45 that outputs a drive force, and a gear case 46 that houses a transmission gear that transmits the output of the motor body 45 to the shaft. The motor body 45 is connected to the lower part of the right cylindrical part 42, and the gear case 46 is connected to the right side (one side in the vehicle width direction) of the right cylindrical part 42 and 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.

A purge pipe 47 that is U-shaped when viewed from the rear is connected to the lower surface 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 is attached to the upper surface 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 portions 42 and are tilted so that they face diagonally downward toward the front. 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.

A canister 51 that collects evaporated fuel from the fuel tank 21 (see FIG. 1) is disposed below the throttle body 41. A cap 81 is attached to cover the right end face (one end face) of the canister 51, and a surge hose 61 and a purge hose 62 are connected to the left end face (the other end face) 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 from the fuel tank 21 is collected into 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.

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 purge flow rate of evaporated fuel from the canister 51 to the intake passage 89 of the throttle valve 43 is adjusted by opening and closing the purge valve 71. In addition, a rubber band 57 is attached to the outer periphery of the canister 51, and a canister bracket 65 is inserted into the rubber band 57. The canister 51 is fixed in a floating state to a frame member (not shown) via the canister bracket 65.

The canister will be described with reference to Figures 4 to 7. Figure 4 is a perspective view of the canister of this embodiment, seen from the right side. Figure 5 is a perspective view of the canister of this embodiment, seen from the left side. Figure 6 is a cross-sectional view of the cap and canister of this embodiment. Figure 7 is a perspective view of the cap of this embodiment. Note that Figure 4(A) shows the state in which the cap is attached to the canister, and Figure 4(B) shows the state in which the cap is removed from the canister.

As shown in Figures 4 and 5, the canister 51 has a resin canister case 52 in which an adsorption chamber is formed. The adsorption chamber of the canister case 52 contains activated carbon or the like capable of temporarily adsorbing evaporated fuel. The right end surface (one end surface) of the canister case 52 is formed with an atmosphere vent nipple 53 that communicates with the atmosphere and a drain nipple 54 that drains moisture and fuel from the adsorption chamber. The atmosphere vent nipple 53 is located in the center of the end surface, and the drain nipple 54 is located below the atmosphere vent nipple 53. A rubber cap 81 is attached to the canister case 52 to cover the right end surface.

On the left end face (the other end face) of the canister case 52, there are formed 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. The fuel tank 21 (see FIG. 1) is connected to the surge nipple 55 via the surge hose 61, and the purge nipple 56 is connected to the intake passage 89 (see FIG. 3) via the purge hose 62 (see FIG. 3). The surge nipple 55 is located in the center of the end face, and the purge nipple 56 is located above the surge nipple 55. In this way, multiple nipples are formed on both the left and right ends of the canister case 52.

A rubber band 57 is attached to the center of the longitudinal direction on the outer peripheral surface of the canister case 52. The upper and lower parts of the rubber band 57 form mounting sections 58 to which the canister bracket 65 is attached, and a flat hole is formed in the mounting section 58. A recess 59 is formed in the part protruding to the right from the upper mounting section 58, and the protrusion 82 of the cap 81 fits into this recess 59 to position the cap 81 in the circumferential direction relative to the rubber band 57. In addition, the pressure of the rubber band 57 tightly adheres the rubber band 57 to the canister case 52, preventing the rubber band 57 from shifting in the circumferential direction relative to the canister case 52.

The canister bracket 65 has a fixed bracket 66 that is fixed to the frame member, and a C-shaped bracket 69 that is attached to the rubber band 57. The fixed bracket 66 has a lower piece 67 on the right side that is bent downward, and an upper piece 68 on the left side that is bent upward. The middle part of the C-shaped bracket 69 is joined to the lower piece 67 of the fixed bracket 66, and both ends of the C-shaped bracket 69 are inserted into flat holes in the upper and lower mounting parts 58 of the rubber band 57. Engine vibrations are transmitted from the frame member to the canister bracket 65, but the rubber band 57 absorbs the engine vibrations, making it difficult for them to be transmitted to the canister 51.

A drive unit 72 for a purge valve 71 is fixed to the upper piece 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 close to each other. A valve case 73 is provided on the left side of the drive unit 72, and a valve (not shown) is housed inside the valve case 73. The drive unit 72 is composed of a solenoid or a motor, etc., and the valve inside the valve case 73 is driven by the drive unit 72. A connector 74 is provided on the front of the drive unit 72, and a control unit (not shown) is connected to the connector 74 via a cable (not shown).

An inlet nipple 75 is formed at the tip end of the valve case 73, and an outlet nipple 76 is formed at the base end of the valve case 73. The inlet nipple 75 is connected to the purge nipple 56 of the canister 51 via a first purge hose 63, and the outlet nipple 76 is connected to the purge pipe 47 of the throttle body 41 (see Figure 3) via a second purge hose 64. The inlet nipple 75 and the outlet nipple 76 extend forward from the valve case 73 and are brought close to the purge nipple 56 and the purge pipe 47. This allows the first and second purge hoses 63, 64 to be made short.

As shown in Figures 6 and 7, a dome-shaped cap 81 is attached to the right end face of the canister case 52, and the cap 81 covers the atmosphere vent nipple 53 and the drain nipple 54. The top portion of the cap 81 faces the atmosphere vent nipple 53, and the portion of the cap 81 below the top portion faces the drain nipple 54. A pair of notches 83 are formed on the outer periphery of the cap 81, which makes the outer periphery of the cap 81 easier to deform, improving the attachment of the cap 81 to the canister case 52. The above-mentioned positioning protrusion 82 is formed on the upper outer periphery of the cap 81.

A U-shaped wall (perimeter wall) 84 is formed on the inner surface of the cap 81, surrounding the periphery except below the atmospheric release nipple 53. An insertion hole (sealing portion) 85 is formed below the U-shaped wall 84, covering the outlet of the drain nipple 54. The drain nipple 54 is sealed by the insertion hole 85, making it difficult for fuel to leak from the outlet of the drain nipple 54 and preventing contamination of parts. In a typical canister, fuel that leaks from the canister case is guided through a drain hose to a position where the parts will not be contaminated, but because the canister 51 of this embodiment is fitted with the cap 81, a drain hose is not necessary, reducing the number of parts.

Below the insertion hole 85, an opening 86 is formed that connects the inside of the cap 81 to the atmosphere. The opening 86 is formed in an arc shape that follows the outer periphery of the cap 81. Because the inside of the atmosphere vent nipple 53 connects to the inside of the cap 81 through the open portion below the U-shaped wall 84, the inside of the atmosphere vent nipple 53 connects to the atmosphere through the opening 86. Even if the atmosphere vent nipple 53 and the drain nipple 54 are hidden by the cap 81 to improve appearance, the inside of the atmosphere vent nipple 53 connects to the atmosphere through the opening 86, so the performance of the canister 51 is not hindered by the cap 81.

Since the atmosphere vent nipple 53 is connected to the atmosphere, various measures have been taken with the cap 81 to prevent foreign matter such as water and dust from entering the atmosphere vent 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 FIG. 6 in particular). In addition, a protruding wall 88 that is larger than the length of the opening 86 and the width of the U-shaped wall 84 is formed at the top of the insertion hole 85. The base end portion of the drain nipple 54 and the protruding wall 88 are located between the opening 86 and the atmosphere vent nipple 53, thereby preventing foreign matter from entering the atmosphere vent nipple 53 from the opening 86.

Furthermore, a pair of notches 83 on the outer periphery of the cap 81 are formed on the sides of the U-shaped wall 84. Even if foreign matter enters the cap 81 through the pair of notches 83, the U-shaped wall 84 surrounds the atmosphere vent nipple 53 except for the lower part, so that the intrusion of foreign matter into the atmosphere vent nipple 53 through the pair of notches 83 is suppressed. At this time, the open surface (lower surface) of the U-shaped wall 84 is positioned lower than the lower ends of the pair of notches 83, so that direct intrusion into the atmosphere vent nipple 53 through the pair of notches 83 is suppressed. By attaching the cap 81 to the canister 51, the placement location of the canister 51 is not restricted by appearance or the ease with which foreign matter can enter.

The layout of the canister will be described with reference to Figures 8 to 10. Figure 8 is a right side view of the engine and its surroundings in this embodiment. Figure 9 is a top view of the engine and canister in this embodiment. Figure 10 is a rear view of the engine and canister in this embodiment.

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

The drive motor 44 of the throttle body 41 extends diagonally downward and rearward, 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. In side view, the upper end P1 of the canister 51 is located above the lower end P2 of the drive motor 44, and the front end P3 of the canister 51 is located forward of the rear end P4 of the drive motor 44. The canister 51 is brought close to the drive motor 44 in the vertical and longitudinal directions, and the throttle body 41 and canister 51 are arranged in a compact manner, thereby preventing the vehicle from becoming too large.

In addition, part of the canister 51, i.e., 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 narrow enough that they come into contact with each other due to engine vibration, but the gap between the cap 81 and the drive motor 44 is ensured to be small enough that they do not come into contact with each other due to engine vibration. Even if the canister 51 comes into contact with the crankcase 31 due to engine vibration, the rubber cap 81 protects the canister 51 from impact. The canister 51 is brought up and down close to the crankcase 31, and is compactly arranged above the crankcase 31, preventing the vehicle from becoming larger.

As shown in FIG. 9, the right end surface (one end surface) of the canister 51 is located inward in the vehicle width direction from the drive motor 44 in a top view, and the overall length of the canister 51 is 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 canister 51 are compactly arranged to prevent the vehicle from becoming larger. The longitudinal center position O of the canister 51 is biased to the right of the center plane C of the engine 30, ensuring space to place the surge hose 61 and purge hose 62 on the left side of the canister 51.

As shown in Figures 9 and 10, the surge hose 61 extends upward from the left end surface of the canister 51, passing through the left side of the throttle body 41, and then extends rearward toward the exhaust port of the fuel tank 21 (see Figure 1). The first purge hose 63 extends from the left end surface of the canister 51 toward the purge valve 71 at the top of the canister 51. At this time, the first purge hose 63 is contained within the front-to-rear width W of the canister 51 in a top view. The second purge hose 64 extends forward and backward 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 the drive motor 44 (see Figure 8).

In this way, the drive motor 44 of the throttle body 41 is provided to the right of the center plane C of the engine 30, and the installation route for the surge hose 61 and the purge hose 62 is secured to the left 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 is brought closer to the drive motor 44, preventing the vehicle from becoming larger. The installation route for the surge hose 61 and the purge hose 62 is 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.

When viewed from the rear, the atmosphere vent nipple 53 on the right end surface 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 vent nipple 53 is located below the gear case 46 (see FIG. 10 in particular). The tip of the atmosphere vent nipple 53 is located on the inside of the vehicle from the outer end of the gear case 46. In addition, a drain nipple 54 (see FIG. 4(B)) is also formed on the right end surface of the canister 51. Since no hose is connected to the atmosphere vent nipple 53 and the drain nipple 54, the canister 51 is brought close to the drive motor 44 with a gap large enough to prevent the drive motor 44 and the canister 51 from coming into contact.

The cap 81 of the canister 51 is located on the opposite side to the left side stand 28 (see Figure 1). Because the side stand 28 allows the vehicle to stand on its own with the vehicle leaning to the left, the left end face of the canister 51 faces downward, making the surge hose 61 and the surge hose 61 less noticeable. The right end face of the canister 51 faces upward, but the air vent nipple 53 on the right end face of the canister 51 is covered by the cap 81, preventing the deterioration of the appearance due to the exposure of the air vent nipple 53. The main frame 12 is located above the cap 81, and the cap 81 itself is covered from above by the main frame 12, making the cap 81 less noticeable and preventing the deterioration of the vehicle's appearance.

As described above, according to this embodiment, the atmosphere vent nipple 53 is hidden by the cap 81, and the canister 51 is made less noticeable by the cap 81, improving the appearance of the vehicle. In addition, because the inside of the atmosphere vent nipple 53 is connected to the atmosphere through the opening 86, the performance of the canister 51 is not hindered by the cap 81.

In this embodiment, a two-cylinder engine is used as an example of the engine, but the type of engine is not particularly limited.

In addition, in this embodiment, the surge nipple and 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, but the surge nipple and 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.

In addition, in this embodiment, the atmosphere vent nipple and the drain nipple are formed on the right side of the canister, but the atmosphere vent nipple and the drain nipple may be formed on the left side of the canister. The canister does not necessarily have to have a drain nipple.

In addition, in this embodiment, the opening of the cap is formed in an arc shape, but the shape of the opening is not particularly limited as long as it allows the inside of the air release nipple to communicate with the atmosphere.

In addition, in this embodiment, a U-shaped wall with an open bottom is used as the peripheral wall of the cap, but the peripheral wall may be formed to surround the entire surface except for a portion of the air vent nipple.

In addition, in this embodiment, an insertion hole is shown as an example of the sealing part of the cap, but the sealing part is not particularly limited as long as it has a shape that can cover the outlet of the drain nipple.

In addition, in this embodiment, the opening of the cap is provided below the insertion hole, but the relative positions of the opening of the cap and the insertion hole are not particularly limited as long as the opening can connect the inside of the air release nipple to the atmosphere.

In addition, in this embodiment, the lower part of the cap overlaps the crankcase in side view, but the cap and crankcase do not have to overlap.

In addition, in this embodiment, the cap is provided on the opposite side of the side stand, but 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.

The canister is not limited to the saddle-ride vehicle shown in the figure, and may be used in other types of saddle-ride vehicles. A saddle-ride vehicle is not limited to vehicles in general on which the rider sits astride the seat, but also includes small scooter-type vehicles on which the rider does not sit astride the seat.

As described above, the canister (51) of this embodiment is a canister that collects evaporated fuel from the fuel tank (21) and introduces it into the intake passage (89), and includes a cylindrical canister case (52) with an atmosphere release nipple (53) formed on one end face, and a cap (81) attached to cover one end face of the canister case, with an opening (86) formed in the cap that connects the inside of the atmosphere release nipple to the atmosphere. With this configuration, the atmosphere release nipple is hidden by the cap, and the canister is made less noticeable by the cap, improving the appearance of the vehicle. In addition, because the inside of the atmosphere release nipple is connected to the atmosphere through the opening, the performance of the canister is not hindered by the cap.

In the canister of this embodiment, the cap is formed with a peripheral wall (U-shaped wall 84) that surrounds the periphery except for a portion of the atmosphere vent nipple. With this configuration, even if an opening is formed in the cap, foreign matter such as dust and water is less likely to enter the atmosphere vent nipple, and the performance of the canister is maintained.

In the canister of this embodiment, the peripheral wall surrounds the canister except for the area below the atmospheric vent nipple, and the cap has a notch (83) formed on the side of the peripheral wall for mounting to the canister case. With this configuration, even if a notch is formed in the cap, foreign matter is less likely to get into the atmospheric vent nipple, and the performance of the canister is maintained.

In the canister of this embodiment, a drain nipple (54) is formed on one end surface of the canister case, and a sealing portion (insertion hole 85) that covers the outlet of the drain nipple is formed in the cap. With this configuration, fuel is less likely to leak from the outlet of the drain nipple, preventing contamination of parts. In addition, a drain hose is no longer necessary, reducing the number of parts.

In the canister of this embodiment, the opening is formed below the sealing portion and closer to one end face of the canister case than the sealing portion. With this configuration, the drain nipple acts as a wall, making it difficult for foreign matter to get into the atmosphere release nipple through the opening, thereby maintaining the performance of the canister.

In the canister of this embodiment, an air cleaner (38) is disposed behind the engine (30), air is guided from the air cleaner to the engine, and the cap is made of rubber, with a portion of the cap overlapping the engine crankcase (31) in side view. With this configuration, the canister is disposed in a narrow space behind the engine, and even if the canister comes into contact with the crankcase due to engine vibration, the rubber cap protects the canister from impact. Therefore, by placing the canister closer to the crankcase, it is possible to prevent the vehicle from becoming larger.

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 positioned above the cap, and the cap is positioned on the opposite side to the side stand. With this configuration, when the vehicle is tilted while the side stand is in use, one end face of the canister faces upward more than the other end face of the canister. The air vent nipple on one end face of the canister is covered by the cap, suppressing deterioration of the appearance due to the exposure of the air vent nipple. Furthermore, the cap itself is covered from above by the main frame and is less noticeable, so the appearance of the vehicle is not impaired.

Although this embodiment has been described, other embodiments may be combinations of the above embodiments and variations in whole or in part.

Furthermore, the technology of the present invention is not limited to the above examples, and may be modified, substituted, or altered in various ways without departing from the spirit of the technical idea. Furthermore, if the technical idea can be realized in a different way due to technological advances or other derived technologies, it may be implemented using that method. Therefore, the claims cover all embodiments that may fall within the scope of the technical idea.

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

Claims (6)

A canister that collects evaporated fuel from a fuel tank and introduces it into an intake passage,
a cylindrical canister case having an air release nipple formed on one end surface;
a cap attached to cover one end surface of the canister case,
The cap is formed with an opening that connects the inside of the atmosphere vent nipple to the atmosphere ,
A canister comprising: a peripheral wall formed on an inner surface of the cap, the peripheral wall surrounding the atmosphere vent nipple except for a portion of the atmosphere vent nipple, the peripheral wall being inside an outer periphery of the cap . The peripheral wall surrounds the periphery except for a portion below the atmosphere vent nipple,
2. The canister according to claim 1 , wherein the cap has a notch formed on a side of the peripheral wall for mounting the cap on the canister case. A canister that collects evaporated fuel from a fuel tank and introduces it into an intake passage,
a cylindrical canister case having an air release nipple and a drain nipple formed on one end surface;
a cap attached to cover one end surface of the canister case,
a drain nipple provided on the cap and configured to receive the drainage passage from the drain outlet of the drain pipe ; 4. The canister according to claim 3 , wherein the opening is formed below the sealing portion and closer to one end face of the canister case than the sealing portion. A canister that collects evaporated fuel from a fuel tank and introduces it into an intake passage,
a cylindrical canister case having an air release nipple formed on one end surface;
a rubber cap attached to cover one end surface of the canister case,
The cap is formed with an opening that connects the inside of the atmosphere vent nipple to the atmosphere ,
An air cleaner is disposed behind the engine, and air is guided from the air cleaner to the engine.
A canister, wherein a portion of the cap overlaps with a crankcase of the engine in a side view . A pair of main frames extend rearward from the head pipe, with a side stand attached to one of the main frames.
6. The canister according to claim 1, wherein the other main frame is located above the cap, and the cap is located on the opposite side to the side stand in the left-right direction of the vehicle .

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