JP6256182B2 - Motorcycle canister layout - Google Patents

Description

  The present invention relates to a canister arrangement structure for a motorcycle.

  2. Description of the Related Art Conventionally, a canister that adsorbs vaporized fuel (evaporated fuel) in a fuel tank of a motorcycle and supplies the adsorbed evaporated fuel to the internal combustion engine using the negative pressure of the intake system caused by the operation of the internal combustion engine is known. ing. The canister suppresses the leakage of the evaporated fuel from the fuel tank to prevent the fuel from being lost and air pollution.

  For example, Patent Document 1 discloses a vehicle body frame including a main frame and a down tube, an internal combustion engine supported by the vehicle body frame, a fuel tank disposed on the main frame, and a fuel tank at the upper rear of the down tube. A motorcycle including a canister disposed below and in a space in front of a cylinder of an internal combustion engine is disclosed. The canister is formed in a cylindrical shape, and includes a charge pipe communicating with the fuel tank, a purge pipe communicating with the internal combustion engine, and an intake pipe and a drain pipe communicating with the atmosphere. The intake pipe extends obliquely downward and forward from the left side surface of the canister. The drain pipe extends downward from the left side surface of the canister.

JP 2013-071486 A

  However, the technique described in Patent Document 1 may not be able to ensure a certain amount or more of the space (dead space) in which the canister is disposed due to the arrangement, shape, size, and the like of the body frame, the internal combustion engine, and the fuel tank. It was. For this reason, the technique described in Patent Document 1 has a possibility that the canister cannot be arranged in the space and the dead space cannot be effectively used.

  Further, the technique described in Patent Document 1 has a problem that foreign matters such as dust and water enter the canister from the intake pipe while the vehicle is running because the intake pipe is opened forward. For this reason, it is difficult for the technique described in Patent Document 1 to maintain the performance of the canister.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a canister arrangement structure for a motorcycle that effectively uses a dead space and suppresses performance degradation of the canister.

  A motorcycle canister arrangement structure according to the present invention includes a vehicle body frame including a main frame extending rearward from a head pipe, a down tube extending downward from the head pipe, and mounted on the vehicle body frame, upward from a crankcase. An internal combustion engine including an extending cylinder; a fuel tank that stores fuel supplied to the internal combustion engine; and a canister that temporarily collects evaporated fuel generated in the fuel tank, and the fuel tank includes: A concave portion that is recessed upward from the lower surface and is disposed across the main frame, and the canister is disposed between the down tube and the cylinder and inside the concave portion of the fuel tank. Features.

  According to this configuration, since the recess is formed in the lower surface of the fuel tank, a large upper space is ensured between the down tube and the cylinder. The canister is disposed in a space that is surrounded by the down tube, the cylinder, and the recess. As a result, the space that originally becomes a dead space can be effectively used as the canister placement space.

  In this case, the canister has an air introduction port for introducing outside air into the interior when the internal combustion engine is operated, and the air introduction port is opened in a range from the lower side to the rear side and is disposed inside the recess. It is preferable.

  According to this configuration, since the air inlet is open in the range from the lower side to the rear and is located in the recess, entry of foreign matter into the canister is suppressed while the vehicle is running. Thereby, the adsorption performance and separation performance of the evaporated fuel which are functions of the canister can be appropriately maintained.

  In this case, a side stand is provided at one side in the vehicle width direction at the lower part of the vehicle body frame, the down tube is inclined downward from the head pipe, and the canister is formed in a rectangular parallelepiped shape. A case provided in an inclined posture parallel to the down tube, and a discharge port for communicating the inside and the outside of the case, wherein the discharge port is located at the lowest position on the side stand side of the case It is preferable that it is provided in the periphery of the corner to be used.

  According to this configuration, the rectangular parallelepiped canister (case) is disposed in a downward gradient along the down tube toward the rear. For this reason, when viewed from the side (vehicle width direction), the corner at the front lower part of the case is the lowest point. For example, if a side stand is used during parking, the vehicle tilts toward the side stand. For this reason, the corner | angular part of a case used as the lowest point by the side stand side will be located further below. And the discharge port is provided in the corner | angular part periphery used as the lowest point by the side stand side. Thereby, the water and the liquefied fuel collected inside the canister (case) can be efficiently discharged to the outside.

  In this case, it is preferable that the canister is formed long in the vehicle width direction and supported by the vehicle body frame in a state where the center in the longitudinal direction and the down tube overlap.

  According to this configuration, the canisters are arranged substantially evenly in the vehicle width direction with respect to the axis of the down tube. For this reason, the weight balance of the motorcycle in the vehicle width direction can be made substantially uniform.

  According to the present invention, the dead space can be effectively used as the canister arrangement space. Moreover, the performance degradation of the canister can be suppressed.

1 is a side view showing a motorcycle according to an embodiment of the present invention. 1 is a front view showing a body frame, a fuel tank, a canister and the like of a motorcycle according to an embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS The canister of the motorcycle which concerns on one Embodiment of this invention is shown typically, Comprising: (A) is a rear view, (B) is a left view. 1 is a system diagram showing a fuel vapor collection / supply path using a motorcycle canister according to an embodiment of the present invention. 1 is a side view showing an arrangement structure of a canister of a motorcycle according to an embodiment of the present invention.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

  The overall configuration of the motorcycle 1 will be described with reference to FIGS. 1 and 2. Here, FIG. 1 is a side view showing the motorcycle 1. FIG. 2 is a front view showing the vehicle body frame 2, the fuel tank 4, the canister 30 and the like. In the following description, each direction is set as indicated by an arrow in each figure.

  As shown in FIG. 1, the motorcycle 1 includes a body frame 2 and an engine 3 and is schematically configured.

  The vehicle body frame 2 includes a head pipe 10, a main frame 11, a down tube 12, a pair of left and right seat rails 13, a pair of left and right body tubes 14, and a pair of left and right side tubes 15. Yes. The main frame 11 extends rearward and downward from the head pipe 10. The down tube 12 extends downward from the head pipe 10. The pair of left and right seat rails 13 extend from the rear portion of the main frame 11 to the rear upper side. The pair of left and right body tubes 14 extend downward from the rear end of the main frame 11. The pair of left and right side tubes 15 are connected to the body tube 14 and the seat rail 13.

  A pair of left and right front forks 10a that pivotally support the front wheel 16 are supported on the head pipe 10 so as to be steerable left and right. A handle bar 17 is fixed to the upper end of the front fork 10a. A fuel tank 4 is provided on the upper side of the main frame 11. A rider seat 5 is provided above the pair of left and right seat rails 13.

  The fuel tank 4 stores fuel (for example, gasoline) supplied to the engine 3. The fuel tank 4 is formed in a substantially bowl shape that is long in the front-rear direction. As shown in FIG. 2, the lower surface 4a of the fuel tank 4 is formed with a recess 4b that is recessed upward. The fuel tank 4 is disposed across the main frame 11 in the recess 4b. The lowermost end 4c of the fuel tank 4 is located below the lower surface 4a.

  As shown in FIG. 1, the down tube 12 is inclined downward from the head pipe 10 toward the rear. Engine suspension brackets 12 a and 14 a for fixing the engine 3 are provided at the lower part of the down tube 12 and the lower parts of the body tubes 14. A swing arm 18 that pivotally supports the rear wheel 19 is fastened to the engine suspension bracket 14a together with the engine 3 by a pivot bolt B1. The swing arm 18 is supported so as to be swingable in the vertical direction about the pivot bolt B1.

  A side stand 6 is provided at the lower left side of the body frame 2. The side stand 6 is rotatably supported by the lower end portion of the left body tube 14. The side stand 6 rotates between an upright position that can be grounded to the road surface and a retracted position that cannot be grounded. The side stand 6 in the standing position contacts the road surface by tilting the vehicle to the left side and supports the motorcycle 1 in a standing state (see FIG. 1).

  The engine 3 as an internal combustion engine functions as a structural member of the vehicle body frame 2 by being mounted on the vehicle body frame 2 via the brackets 12a and 14a. The engine 3 is configured to include a crankcase 20 and a cylinder 21.

  The cylinder 21 extends upward from the crankcase 20. A crankshaft (not shown) is rotatably provided in the crankcase 20. Inside the cylinder 21, a piston (not shown) connected to the crankshaft via a connecting rod (not shown) is provided so as to be movable up and down.

  The cylinder 21 includes a cylinder block 21a, a cylinder head 21b, and a head cover 21c. The cylinder block 21 a is erected with a slight inclination from the front upper surface of the crankcase 20 to the front side. The cylinder head 21b is provided on the upper part of the cylinder block 21a, and the head cover 21c is provided on the upper part of the cylinder head 21b.

  An intake port 22 is provided at the rear of the cylinder head 21b. A fuel tank 4 and an air cleaner 24 are connected to the intake port 22 via a fuel supply device 23. The air cleaner 24 cleans the outside air introduced inside. The fuel supply device 23 supplies an air-fuel mixture obtained by mixing purified outside air and fuel into the cylinder 21.

  On the other hand, an exhaust port 25 to which an exhaust pipe 26 is connected is provided at the front of the cylinder head 21b. The exhaust pipe 26 is curved so as to make a U-turn downward, and extends rearward through the lower side of the crankcase 20. An exhaust muffler (not shown) is connected to the rear end portion of the exhaust pipe 26.

  The engine 3 burns the air-fuel mixture supplied from the fuel supply device 23 via the intake port 22 in the cylinder 21 to reciprocate the piston. The reciprocating motion of the piston is converted into the rotational motion of the crankshaft, and the rear wheel 19 is rotationally driven via a drive chain or the like (not shown). The exhaust gas after combustion is exhausted to the outside through the exhaust port 25 and the exhaust pipe 26 from the exhaust muffler.

  Incidentally, for example, in the parked motorcycle 1, the fuel stored in the fuel tank 4 may vaporize and stay in the fuel tank 4 due to the influence of direct sunlight or the like. When the vaporized fuel (evaporated fuel) leaks into the atmosphere, the fuel is lost unnecessarily and there is a concern about adverse environmental effects. For this reason, the motorcycle 1 includes a canister 30 that temporarily collects evaporated fuel generated in the fuel tank 4.

  First, the structure of the canister 30 will be described with reference to FIGS. FIG. 3 schematically shows the canister 30, (A) is a rear view, and (B) is a left side view. FIG. 4 is a system diagram showing an evaporative fuel collection / supply path using the canister 30. In FIG. 4, the broken line arrows indicate the flow of air, and the solid line arrows indicate the flow of evaporated fuel. The canister 30 is assumed to be removed from the motorcycle 1 (body frame 2).

  As shown in FIGS. 2 and 3, the canister 30 includes a case 31, an inlet pipe 32, an outlet pipe 33, an air introduction port 34, and a discharge port 35.

  The case 31 is formed in a hollow rectangular parallelepiped shape (rectangular cylindrical shape) that is long in the vehicle width direction (left-right direction) (see FIG. 2 and the like). The case 31 is formed in a substantially square shape when viewed from the side (see FIG. 3B). Activated carbon 36 as an adsorbent is closely packed inside the case 31 (see FIG. 3A).

  The inlet pipe 32 is disposed on the upper side of the right side surface 31 </ b> R of the case 31 and communicates with the inside of the case 31. The inlet pipe 32 is connected to the fuel tank 4 via the inlet tube 40 (see FIG. 4). The outlet pipe 33 is disposed at the center of the right side surface 31 </ b> R of the case 31 and communicates with the inside of the case 31. The outlet pipe 33 is connected to the fuel supply device 23 via the outlet tube 41 (see FIG. 4).

  The air introduction port 34 has an introduction convex portion 34a and an introduction pipe 34b. The introduction convex portion 34a is convexly provided in the vicinity of the upper rear corner portion C1 of the left side surface 31L of the case 31 (see FIG. 3B). The introduction convex portion 34a is formed in a substantially semicircular shape whose bottom surface is flat when viewed from the side. The introduction pipe 34b is formed in a hollow cylindrical shape, and extends downward from the lower surface of the introduction convex portion 34a. The leading end of the introduction pipe 34b is open to the atmosphere. The introduction pipe 34b allows the inside and the outside of the case 31 to communicate with each other via the introduction convex portion 34a.

  The discharge port 35 is disposed in the vicinity of the corner C2 in front of the lower part of the left side surface 31L of the case 31 (see FIG. 3B). Specifically, the discharge port 35 is opened on the lower surface of the discharge convex portion 35a that is protruded from the left side surface 31L. One end of a drain tube 42 is connected to the discharge port 35. The drain tube 42 extends to the lower part of the engine 3 along the down tube 12 and opens the other end to the atmosphere (see FIG. 1). The discharge port 35 allows the inside and the outside of the case 31 to communicate with each other via the drain tube 42.

  Here, the operation of the canister 30 will be described with reference to FIG. The evaporated fuel generated by warming the fuel in the fuel tank 4 is sent from the inlet pipe 32 into the case 31 through the inlet tube 40. The evaporated fuel sent into the case 31 is adsorbed by the activated carbon 36. That is, the evaporated fuel is temporarily collected.

  Next, when the engine 3 operates, the inside of the cylinder 21 becomes negative pressure by the downward movement of the piston. For this reason, the evaporated fuel collected by the activated carbon 36 is sucked from the case 31 through the outlet pipe 33 and the outlet tube 41 toward the fuel supply device 23. Further, since the inside of the case 31 becomes negative pressure due to this suction action, the outside air is introduced into the case 31 from the air introduction port 34. The outside air introduced from the air inlet 34 promotes the suction action of the evaporated fuel. When the pressure inside the case 31 becomes positive, the gas (air), water, liquefied fuel, etc. accumulated in the case 31 are discharged from the discharge port 35 to the outside through the drain tube 42. Thereby, for example, the fuel (liquid) or water that has entered the case 31 due to the vehicle overturning or due to wind and rain can be discharged, and the performance of the canister 30 can be prevented from being deteriorated.

  Next, the arrangement structure of the canister 30 will be described with reference to FIGS. FIG. 5 is a side view showing the arrangement structure of the canister 30 of the motorcycle 1.

  As shown in FIG. 2, since the recess 4b is formed in the lower surface 4a of the fuel tank 4, a large upper space is ensured between the down tube 12 and the cylinder 21 (head cover 21c).

  The canister 30 is disposed in a space S that is surrounded by the down tube 12, the head cover 21c, and the recess 4b of the fuel tank 4 (see FIG. 1). That is, the canister 30 is disposed between the down tube 12 and the cylinder 21 and inside the recess 4 b of the fuel tank 4. Precisely, the upper half of the canister 30 is located inside the recess 4b (above the lowermost end 4c of the fuel tank 4) (see FIG. 5).

  As shown in FIG. 5, the canister 30 is attached to a reinforcing frame 50 that connects the head pipe 10, the main frame 11, and the down tube 12. The case 31 of the canister 30 is supported by the reinforcing frame 50 via a fixed bracket 51 bent rearward in a side view. The canister 30 (case 31) is provided on the rear side of the down tube 12 in an inclined posture parallel to the down tube 12. That is, the front surface of the case 31 faces the rear surface of the down tube 12 in parallel.

  As shown in FIG. 2, the canister 30 is supported by the vehicle body frame 2 (reinforcement frame 50) with the longitudinal center and the down tube 12 overlapping. That is, the canisters 30 are arranged substantially equally to the left and right with respect to the axis of the down tube 12 in a front view. For this reason, the weight balance of the motorcycle 1 in the vehicle width direction can be made substantially uniform.

  As shown in FIG. 5, since the canister 30 is in a posture in which the upper part is inclined forward, the pipes 32 and 33, the air introduction port 34, and the discharge port 35 are similarly inclined. Therefore, the air introduction port 34 is located around the corner C1 located at the uppermost position on the left side surface 31L of the case 31. The introduction pipe 34b of the air introduction port 34 is opened downward and rearward. Moreover, the air introduction port 34 is arrange | positioned inside the recessed part 4b. Precisely, the introduction pipe 34b of the air introduction port 34 is disposed so as to be substantially the same height as the lowermost end portion 4c of the fuel tank 4. In addition, the air introduction port 34 (introduction pipe 34b) should just be open | released in the range from a vertically downward direction to a horizontal back.

  On the other hand, the discharge port 35 is located in the vicinity of the corner C2 positioned on the lowermost side of the left side surface 31L of the case 31. The discharge port 35 is opened downward and rearward. Further, the discharge port 35 is disposed on the lower side of the concave portion 4b (lower side than the lowermost end portion 4c of the fuel tank 4).

  According to the arrangement structure of the canister 30 of the motorcycle 1 according to the embodiment described above, the space S that originally becomes a dead space can be effectively used as the arrangement space of the canister 30. The air introduction port 34 is open toward the lower rear and is located in the recess 4b (more than the lowermost end 4c of the fuel tank 4). For this reason, entry of foreign matter (dust, water, etc.) into the canister 30 is suppressed while the vehicle is running. Thereby, the adsorption performance and separation performance of the evaporated fuel, which are functions of the canister 30, can be appropriately maintained.

  Conventionally, it has been common to connect a hose to the air introduction port 34 (introduction pipe 34b) as a countermeasure against the entry of foreign matter. On the other hand, the air introduction port 34 of the canister 30 according to the present embodiment is a mode in which foreign matter is difficult to enter during traveling of the vehicle, and thus a hose that has been conventionally required can be omitted. Thereby, the periphery structure of the canister 30 can be simplified and cost reduction can be aimed at.

  Further, since the canister 30 is covered with the fuel tank 4, for example, it can be prevented that the canister 30 is exposed to direct sunlight when the vehicle is parked. Furthermore, since the canister 30 is provided at a position away from the road surface, the influence of radiant heat from the road surface can be reduced. Thereby, the raise of the internal temperature of the canister 30 can be suppressed, and the fall of adsorption | suction performance (charge efficiency) can be prevented. Further, since the canister 30 is provided at a position away from the road surface, it is possible to reduce the risk of collision of pebbles and the like that are flipped up while the vehicle is traveling.

  Further, according to the arrangement structure of the canister 30 of the motorcycle 1 according to the present embodiment, the rectangular parallelepiped canister 30 (case 31) is arranged along the down tube 12 with a downward slope toward the rear. For this reason, the corner | angular part C2 of the front lower part of case 31 becomes a lowest point by side view. For example, when the side stand 6 is rotated to the standing position during parking and used, the vehicle tilts to the side stand 6 side (left side). For this reason, the corner | angular part C2 used as the lowest point in the left side surface 31L of case 31 will be located further below. And the discharge port 35 is provided in the corner | angular part C2 periphery used as the lowest point in 31 L of left side surfaces. As a result, the water and liquefied fuel accumulated in the canister 30 (case 31) can be efficiently discharged to the outside.

  In addition, in the arrangement structure of the canister 30 according to the present embodiment, the upper half of the canister 30 is arranged inside the recess 4b, but the present invention is not limited to this. For example, the entire canister 30 may be positioned inside the recess 4b. That is, the canister 30 may be disposed entirely or partially inside the recess 4b. Preferably, the air introduction port 34 should just be located inside the recessed part 4b. Exactly, the introduction pipe 34b should just be arrange | positioned more than the same height as the lowest end part 4c of the fuel tank 4. FIG.

  In the canister 30 according to this embodiment, the pipes 32 and 33 are provided on the right side surface 31R of the case 31, and the air introduction port 34 and the discharge port 35 are provided on the left side surface 31L of the case 31. However, the present invention is not limited to this. For example, each of the pipes 32 and 33 is provided at one end of either the front or back or upper and lower surfaces of the case 31, and the air introduction port 34 and the discharge port 35 are provided at the other end of the front or rear or upper or lower surface of the case 31. Also good. Even in this case, it is preferable that the discharge port 35 is provided in the vicinity of the corner C <b> 2 positioned at the lowest position on the side stand 6 side of the case 31.

  In addition, since description of embodiment of the above-mentioned this invention has demonstrated suitable embodiment in the canister arrangement | positioning structure of the motorcycle which concerns on this invention, there may be a case where the technically preferable various restrictions are attached | subjected. However, the technical scope of the present invention is not limited to these embodiments unless specifically described to limit the present invention. Furthermore, the components in the embodiment of the present invention described above can be appropriately replaced with existing components and the like, and various variations including combinations with other existing components are possible. The description of the embodiment of the present invention is not intended to limit the content of the invention described in the claims.

1 motorcycle 2 body frame 3 engine (internal combustion engine)
4 Fuel tank 4a Lower surface 4b Recessed portion 6 Side stand 10 Head pipe 11 Main frame 12 Down tube 20 Crankcase 21 Cylinder 30 Canister 31 Case 34 Atmospheric inlet 35 Exhaust port C1, C2 Corner

Claims (3)

A vehicle body frame including a main frame extending rearward from the head pipe and a down tube extending downward from the head pipe;
An internal combustion engine including a cylinder mounted on the vehicle body frame and extending upward from a crankcase;
A fuel tank for storing fuel supplied to the internal combustion engine;
A canister that temporarily collects the evaporated fuel generated in the fuel tank,
A side stand is provided at one side in the vehicle width direction at the bottom of the body frame.
The down tube is provided to be inclined downward from the head pipe toward the rear,
The fuel tank is disposed across the main frame in a recess recessed upward from the lower surface,
The canister is disposed between the down tube and the cylinder and inside the recess of the fuel tank ,
The canister
A case formed in a rectangular parallelepiped shape and provided in an inclined posture parallel to the down tube;
A discharge port for communicating the inside and the outside of the case,
The canister arrangement structure for a motorcycle, wherein the discharge port is provided in a periphery of a corner portion located at a lowermost position on the side stand side of the case . The canister has an air inlet for introducing outside air into the interior when the internal combustion engine is operating,
2. The canister arrangement structure for a motorcycle according to claim 1, wherein the air introduction port is opened in a range from the lower side to the rear side and is arranged inside the concave portion. 3. The canister arrangement of a motorcycle according to claim 1, wherein the canister is formed long in a vehicle width direction and is supported by the vehicle body frame in a state where a longitudinal center and the down tube overlap each other. Construction.

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