JP5404319B2 - Motorcycle - Google Patents

Description

  The present invention relates to a motorcycle, and more particularly, to a structure of a shroud provided on both side surfaces in a vehicle width direction of a fuel tank of the motorcycle.

  2. Description of the Related Art Conventional motorcycles are known in which shrouds are arranged on both side surfaces in the vehicle width direction of a fuel tank, and the shroud extends to the lower side of the fuel tank (see, for example, Patent Document 1).

JP 2007-320427 A

  By the way, in the motorcycle described in Patent Document 1, shrouds are arranged on both side surfaces of the fuel tank in the vehicle width direction to improve the appearance, but further improvement in the functionality of the shroud has been desired.

  The present invention has been made in consideration of such circumstances, and an object thereof is to provide a motorcycle capable of improving the functionality of a shroud.

In order to achieve the above-described object, the invention according to claim 1 is directed to a head pipe that supports the front wheels so as to be steerable, a frame extending rearward from the head pipe, an upper part of the frame, and a substantially center of the frame. A seat disposed behind, a fuel tank disposed above the frame and between the head pipe and the seat, an engine suspended on the frame below the fuel tank, and both sides of the fuel tank in the vehicle width direction A cooling fin provided on a surface of the engine, a lower end of the shroud extending to a cylinder block of the engine, an inner surface of the shroud extending toward the cooling fin, and a rear of the shroud. A first recess that is recessed in a direction away from the engine is formed on the inner side surface, and the rear wall of the first recess extends toward the cooling fin. Is the fact characterized.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect of the invention, the engine has a cylinder axis line inclined forward, and the rear edge of the shroud faces the cooling fin in a side view of the vehicle. It is characterized by being disposed in front of the cylinder axis at the position where it is disposed.

According to a third aspect of the present invention, in addition to the configuration of the first aspect of the invention, the shroud includes an outer shroud and an inner shroud that can be divided in the vehicle width direction, and a first recess is formed in the inner shroud. The rear wall of the first recess is exposed from an opening provided in the rear portion of the outer shroud, and a convex portion protruding outward is formed on the rear wall of the first recess.

According to a fourth aspect of the invention, in addition to the configuration of the first aspect of the invention, a vent hole is provided in the rear wall of the first recess.

According to the fifth aspect of the present invention, in addition to the configuration of the first aspect of the invention, the shroud includes an outer shroud and an inner shroud that can be divided in the vehicle width direction. The wall is formed in a substantially U-shape protruding forward, and the rear wall of the outer shroud is formed to extend outward from the side surface of the fuel tank in the vehicle width direction.

According to the sixth aspect of the invention, in addition to the configuration of the first aspect of the invention, an inclined wall is formed on the front upper portion of the shroud so as to face the front of the vehicle and to incline upward from the front toward the rear. In the upper part of the fuel tank, a second recess is formed which is continuous with the inclined wall and is inclined upward from the front to the rear.

According to a seventh aspect of the invention, in addition to the configuration of the invention of the sixth aspect , the shroud is composed of an outer shroud and an inner shroud that can be divided in the vehicle width direction, and an inclined wall is formed on the inner shroud. The inclined wall is formed so as to protrude to the front of the fuel tank, has a width direction inclined surface that is inclined downward as it goes from the outside in the vehicle width direction to the inside, and the inclined wall of the inner shroud and the upper end of the outer shroud, The joints are formed flush with each other.

According to an eighth aspect of the invention, in addition to the configuration of the invention of the fourth aspect , the shroud includes an outer shroud and an inner shroud that can be divided in the vehicle width direction, and a first recess is formed in the inner shroud. The rear wall of the first recess is exposed from an opening provided at the rear portion of the outer shroud, and the ventilation hole is covered by the rear portion of the outer shroud when viewed from the rear of the vehicle. It is characterized by being arranged below.
The invention described in claim 9 is characterized in that, in addition to the configuration of the invention described in claim 1, a ventilation hole is provided in the upper wall of the first recess.

According to the motorcycle of claim 1, the cooling fin is provided on the surface of the engine, the lower end of the shroud extends to the cylinder block of the engine, and the inner surface of the shroud extends toward the cooling fin. The running air can be guided to the engine by the inner surface of the engine, and the cooling efficiency of the engine can be improved. Thereby, the functionality of the shroud can be improved.
Further, according to the motorcycle of the first aspect, the first concave portion that is recessed in the direction away from the engine is formed on the rear inner surface of the shroud, and the rear wall of the first concave portion extends toward the cooling fin. Therefore, a space can be secured between the engine and the shroud by the first recess, and the air flow around the engine when the vehicle is stopped can be secured to improve the cooling performance of the engine.

  According to the motorcycle according to claim 2, the engine has the cylinder axis inclined forward, and in the vehicle side view, at the position where the rear edge of the shroud faces the cooling fin, the front side of the cylinder axis. Therefore, the rectification of the traveling wind by the shroud is performed in front of the cylinder axis. As a result, the flow of the traveling wind can be changed in front of the cooling fins of the engine, and the traveling wind can be supplied to the entire cooling fins, so that the engine cooling efficiency can be further improved.

According to the motorcycle of claim 3 , the shroud includes an outer shroud and an inner shroud that can be divided in the vehicle width direction, the first recess is formed in the inner shroud, and the rear shroud is formed on the rear wall of the first recess. In order to expose from the opening provided in the rear part and form a convex part protruding outward on the rear wall of the first concave part, the rear wall formed with the convex part of the inner shroud on the user side can be exposed, The appearance of the motorcycle can be improved. Further, the strength of the rear wall on which the traveling wind acts can be improved by the convex portion.

According to the motorcycle of the fourth aspect , since the ventilation hole is provided in the rear wall of the first recess, the wind pressure (running resistance) generated by the running wind acting on the shroud can be suppressed.

According to the motorcycle of claim 5 , the shroud includes an outer shroud and an inner shroud that can be divided in the vehicle width direction, and the rear wall of the outer shroud projects forward in a vehicle side view. The outer shroud is formed in a shape and the rear wall of the outer shroud extends from the side of the fuel tank to the outside in the vehicle width direction, so that a leg shield function can be added to the shroud, The traveling wind acting can be reduced.

According to the motorcycle of claim 6 , an inclined wall that faces the front of the vehicle and is inclined upward as it goes from the front to the rear is formed on the upper front side of the shroud, and the inclined wall is formed on the upper portion of the fuel tank. Since the second concave portion that is inclined upward as it goes from the front to the rear is formed continuously, the flow velocity of the traveling wind on the upper surface of the fuel tank can be increased, so that the motion characteristics of the motorcycle can be improved.

According to the motorcycle of claim 7 , the shroud is composed of an outer shroud and an inner shroud that can be divided in the vehicle width direction, an inclined wall is formed in the inner shroud, and the inclined wall projects to the front of the fuel tank. The width direction inclined surface which inclines below as it goes inward from the vehicle width direction outside is formed, and the junction part of the inclined wall of an inner shroud and the upper end of an outer shroud is formed flush. Therefore, the flow of the traveling wind on the inclined wall can be made smooth, and the occurrence of air accumulation can be prevented. Thereby, when rolling a vehicle, it can avoid that an inclined wall becomes air resistance, Therefore The motion characteristic of a motorcycle can be improved.

According to the motorcycle according to claim 8 , the ventilation hole is covered with the rear portion of the outer shroud when viewed from the rear of the vehicle. Therefore, the ventilation hole can be hidden from the appearance, and the appearance of the motorcycle can be improved. it can. Further, since the opening is disposed outside and below the vehicle width direction of the ventilation hole, the traveling wind can be guided outward and below in the vehicle width direction, and the windproof effect for the user can be improved. In addition, it is possible to promote the separation of the traveling wind on the surface of the outer shroud and to impart lightness to the steering of the motorcycle.

1 is a left side view for explaining an embodiment of a motorcycle according to the present invention. FIG. 2 is an enlarged left side view around the shroud shown in FIG. 1. It is a top view of a shroud and a fuel tank shown in FIG. Fig. 2 is a partially cutaway front view of the motorcycle shown in Fig. 1. It is a front view of a shroud and a vehicle body frame shown in FIG. Fig. 2 is a partially cutaway rear view of the motorcycle shown in Fig. 1. It is a rear view of a shroud and a vehicle body frame shown in FIG. It is the perspective view which looked at the shroud and vehicle body frame shown in FIG. 7 from back and the left. It is a schematic sectional drawing of the AA line of FIG. 3A is a cross-sectional view taken along line BB in FIG. 3, FIG. 3B is a cross-sectional view taken along line CC in FIG. 3, and FIG. 3C is a cross-sectional view taken along line DD in FIG. It is a left view of the outer shroud on the left side of the vehicle. It is a top view of the outer shroud on the left side of the vehicle. It is a left view of the inner shroud of the vehicle left side. It is a top view of the inner shroud of the vehicle left side. FIG. 6 is a rear view for explaining a modified example of the motorcycle according to the present invention. It is a left view of the periphery of the ventilation hole shown in FIG. FIG. 17 is a cross-sectional view taken along line EE in FIG. 16. It is a left view of the inner shroud of the vehicle left side shown in FIG.

  Hereinafter, an embodiment of a motorcycle according to the present invention will be described in detail with reference to the drawings. It should be noted that the drawings are viewed in the direction of the reference numerals, and in the following description, front, rear, left and right, and top and bottom are in accordance with the direction seen from the operator. R, upper is shown as U, and lower is shown as D.

  As shown in FIG. 1, the motorcycle 10 according to the present embodiment includes a head pipe 12 provided at a front end of a vehicle body frame 11, a main frame 13 extending rearwardly and rearwardly and downwardly from the head pipe 12, A pivot plate 14 connected to the rear end portion, a pair of left and right seat frames 15 connected to the middle portion of the main frame 13 and extending rearward and upward, and a rear end portion connected to the pivot plate 14 and extending rearward and upward. A pair of left and right subframes 16 connected to the rear end portion of the seat frame 15, a down tube 17 extending rearward and downward from the head pipe 12, and the rear portion of the head pipe 12 and the main frame to reinforce the periphery of the head pipe 12 A gusset 18 coupled to the front of 13 and the top of the down tube 17; And a reinforcement frame 19 that connects between the engine 13 and the gusset 18, and is provided integrally with the main frame 13, the pivot plate 14, and the down tube 17 at the rear portion of the engine 50 and the engine 50. 51 is attached.

  The motorcycle 10 includes a front fork 21 that is steerably supported by the head pipe 12, a front wheel WF that is rotatably supported by the lower end portion of the front fork 21, and steering that is attached to the upper end portion of the front fork 21. Handle 22, swing arm 23 pivotally supported on pivot plate 14, rear wheel WR rotatably supported on the rear end of swing arm 23, swing arm 23 and main frame 13. A cushion unit 24 to be connected, a headlight 26 and a meter 27 provided in front of the head pipe 12, a seat 28 disposed above the main frame 13 and from substantially the center of the main frame 13, and the main frame 13. And a fuel tank 29 disposed between the head pipe 12 and the seat 28 , Comprising a.

  The motorcycle 10 includes a vehicle body cover 30 that covers the periphery of the vehicle body frame 11. The vehicle body cover 30 includes a front cowl 31 that covers the periphery of the headlight 26, and a meter that is fixed above the front cowl 31. A cover 32, a shroud 70 fixed to both side surfaces of the fuel tank 29 in the vehicle width direction, a side cover 34 covering the side of the middle part of the body frame 11, and a rear side cover 35 covering the side of the rear part of the body frame 11. And comprising.

  In FIG. 1, reference numeral 41 is a front winker, 42 is a front fender, 43 is a taillight, 44 is a rear winker, 45 is a rear fender, 46 is a grab rail, and 47 is a main step.

  As shown in FIGS. 1 and 2, the engine 50 is disposed below the fuel tank 29, and its outer shell is mainly a crankcase 52 and a cylinder block attached to the front upper end of the crankcase 52. 53, a cylinder head 54 attached to the upper end of the cylinder block 53, a cylinder head cover 55 covering the upper opening of the cylinder head 54, an ACG (generator) cover 56 covering the left side opening of the crankcase 52, a crank And a clutch cover 57 that covers the opening on the right side surface of the case 52. Further, in the present embodiment, cooling fins 58 that cool the engine 50 when the traveling wind strikes are formed on the peripheral surfaces of the cylinder block 53 and the cylinder head 54. Further, the cylinder axis S of the cylinder block 53 is disposed to be inclined forward.

  As shown in FIG. 1, a throttle body 62 is connected to an intake port (not shown) formed in the rear portion of the cylinder head 54 via an intake pipe 61, and a connection is made to the upstream end of the throttle body 62. An air cleaner 64 is connected via the pipe 63. A muffler 66 is connected to an exhaust port (not shown) formed in the front portion of the cylinder head 54 via an exhaust pipe 65.

  As shown in FIGS. 2 to 14, the shroud 70 includes an outer shroud 80 and an inner shroud 90 that can be divided in the vehicle width direction, and a lower end thereof extends to the cylinder block 53. The inner shroud 80 is provided with five boss portions 80a so as to be scattered on the inner side surface, and the inner shroud 90 has screw insertion holes 90a at positions corresponding to the five boss portions 80a. The outer shroud is formed by overlapping the boss portion 80a of the outer shroud 80 with the screw insertion hole 90a of the inner shroud 90 and fastening a screw (not shown) to the boss portion 80a via the screw insertion hole 90a. 80 and inner shroud 90 are joined together.

  As shown in FIGS. 2 to 14, an insertion bracket 80 b into which a support piece 29 a fixed to the intermediate side surface of the fuel tank 29 is inserted is formed on the inner rear surface of the upper rear portion of the outer shroud 80. A screw insertion hole 90b is formed on the upper surface of the inner shroud 90 at a position corresponding to the support portion 29b fixed to the front side surface of the fuel tank 29. An insertion bracket 80b is attached to the support piece 29a of the fuel tank 29. The upper portion of the shroud 70 is fixed to the fuel tank 29 by inserting the screw 101 into the support portion 29b of the fuel tank 29 via the screw insertion hole 90b.

  The lower portion of the shroud 70 is supported by a shroud stay 71 provided in the down tube 17 as shown in FIGS. 5 to 8, and the shroud stay 71 is connected to the back surface of the down tube 17. 72, a base plate 73 fastened to both ends in the vehicle width direction of the base stay 72 by bolts 102, 102, a pipe-like stay body 74 coupled to the lower edge of the base plate 73 and extending on both sides in the vehicle width direction, and a base stay And a horn stay 75 formed integrally with the left end portion of 72. Then, as shown in FIG. 2, the bolt 103 is fastened to the end of the stay main body 74 of the shroud stay 71 through a screw insertion hole 90c formed in the lower end of the inner shroud 90, so that the lower portion of the shroud 70 is removed. It is fixed to the shroud stay 71. Note that reference numeral 83 in FIG. 11 is a fitting hole into which the bolt head of the bolt 103 is fitted.

  In the present embodiment, as shown in FIG. 2, the rear edge of the shroud 70 is disposed so as to face the cylinder block 53 and the cooling fins 58 of the cylinder head 54 in the side view of the vehicle, and the cylinder block 53. Is arranged in front of the cylinder axis S.

  Further, in the present embodiment, as shown in FIGS. 3 to 5 and 10, an inclined wall 91 is formed on the front upper portion of the inner shroud 90 so as to face the front of the vehicle and to incline upward from the front toward the rear. In addition, an arc-shaped concave portion (second concave portion) 29c is formed in the upper portion of the fuel tank 29, which is continuous with the inclined wall 91 and is inclined upward from the front toward the rear.

  As shown in FIGS. 3 to 5 and 10, the inclined wall 91 of the inner shroud 90 is formed to protrude to the front of the fuel tank 29. In addition, the inclined wall 91 has a width direction inclined surface 92 that is inclined downward as it goes from the outside in the vehicle width direction to the inside in the vehicle width direction outer edge. Further, the joint portion 100 between the inclined wall 91 and the upper end of the outer shroud 80 is formed flush.

  As shown in FIGS. 6 to 9, the inner surface of the inner side of the inner shroud 90 is formed with a concave portion (first concave portion) 93 extending rearward and downward and recessed in a direction away from the engine 50. A wind guide plate 95 extending toward the cooling fin 58 of the cylinder block 53 and the cylinder head 54 is formed on the inner edge in the vehicle width direction of the rear wall 94 of the recess 93.

  Further, as shown in FIGS. 6 to 8, the rear wall 94 of the recessed portion 93 has three convex portions 96 arranged in the vertical direction in the rear view and projecting outward in the longitudinal direction in the vehicle width direction. The three convex portions 96 are formed and exposed to the outside from an opening 82 formed in the lower portion of the rear wall 81 of the outer shroud 80.

  As shown in FIGS. 6 to 9, a ventilation hole 97 is formed in the upper end portion of the rear wall 94 of the recess 93 to allow the traveling wind that has entered the recess 93 to pass rearward. The ventilation hole 97 is formed so as to be positioned above the cylinder head cover 55 of the engine 50. Moreover, the arrow in FIG. 9 represents the flow of traveling wind.

  Further, as shown in FIGS. 2 and 8, the rear wall 81 of the outer shroud 80 is formed in a substantially square shape projecting forward and seen from the side of the fuel tank 29 in the vehicle width direction as viewed from the side of the vehicle. It is formed so as to extend in the direction.

  As described above, according to the motorcycle 10 of the present embodiment, the cooling fins 58 are provided on the surfaces of the cylinder block 53 and the cylinder head 54 of the engine 50, and the lower end of the shroud 70 extends to the cylinder block 53. Since the air guide plate 95 provided on the inner surface of the shroud 70 extends toward the cooling fin 58, the traveling air can be guided to the cooling fin 58 by the air guide plate 95, and the cooling efficiency of the engine 50 can be improved. it can. Thereby, the functionality of the shroud 70 can be improved.

  Further, according to the motorcycle 10 of the present embodiment, the cylinder axis S of the cylinder block 53 is disposed forwardly inclined, and the rear edge of the shroud 70 is disposed so as to face the cooling fin 58 in a side view of the vehicle. Since it is disposed on the front side of the cylinder axis S, the rectification of the traveling wind by the shroud 70 is performed on the front side of the cylinder axis S. Thus, the flow of the traveling wind can be changed on the front side of the cooling fin 58, and the traveling wind can be supplied to the entire cooling fin 58, so that the cooling efficiency of the engine 50 can be further improved.

  Further, according to the motorcycle 10 of the present embodiment, the recessed portion 93 that is recessed in the direction away from the engine 50 is formed on the inner surface on the rear side of the inner shroud 90, and the inner wall direction edge of the rear wall 94 of the recessed portion 93 is formed. Since the air guide plate 95 extending toward the cooling fin 58 is formed, a space can be secured between the engine 50 and the shroud 70 by the recess 93, and the air around the engine 50 when the vehicle is stopped can be secured. The flow can be secured and the cooling performance of the engine 50 can be improved.

  Further, according to the motorcycle 10 of the present embodiment, the rear wall 94 of the concave portion 93 is exposed from the opening 82 provided in the rear wall 81 of the outer shroud 80, and the convex portion protrudes outward from the rear wall 94 of the concave portion 93. Since 96 is formed, it is possible to expose the rear wall 94 in which the convex portion 96 is formed on the user side, and the appearance of the motorcycle 10 can be improved. Further, the strength of the rear wall 94 on which the traveling wind acts can be improved by the convex portion 96. Furthermore, since the longitudinal direction of the convex portion 96 is directed in the vehicle width direction, the effect of rectifying the traveling wind to the engine 50 can be enhanced.

  Further, according to the motorcycle 10 of the present embodiment, the ventilation hole 97 is provided in the rear wall 94 of the recess 93, so that wind pressure (running resistance) generated by running wind acting on the shroud 70 can be suppressed. The ground pressure of the front wheel WF can be improved. Further, since the ventilation hole 97 is formed so as to be positioned above the cylinder head cover 55, the influence of the wind pressure acting on the shroud 70 can be reduced without reducing the traveling wind supplied to the cooling fin 58. it can.

  Further, according to the motorcycle 10 of the present embodiment, the rear wall 81 of the outer shroud 80 is formed in a substantially square shape projecting forward in the vehicle side view, and is outward from the side surface of the fuel tank 29 in the vehicle width direction. Therefore, the leg shield function can be added to the shroud 70, and the traveling wind acting on the legs of the driver can be reduced.

  Further, according to the motorcycle 10 of the present embodiment, the inclined wall 91 is formed on the front upper portion of the inner shroud 90 so as to face the front of the vehicle and to be inclined upward from the front toward the rear. Further, since the concave portion 29c that is inclined upward as it goes from the front to the rear is formed continuously with the inclined wall 91, the flow velocity of the traveling wind on the upper surface of the fuel tank 29 can be increased. The characteristics can be enhanced.

  Further, since the traveling wind acts on the inclined wall 91 when the vehicle is traveling straight, the ground pressure of the front wheel WF can be increased, and the vehicle is inclined when the vehicle is turning, so that the vehicle travels on the upper surface of the inclined wall 91 and the fuel tank 29. Since the wind does not act on the ground contact direction of the front wheel WF, but acts to deviate the traveling wind, the lightness of handling can be improved. For this reason, it is possible to rectify the traveling wind in accordance with the traveling state of the motorcycle 10 (during straight traveling or turning).

  Further, according to the motorcycle 10 of the present embodiment, the inclined wall 91 of the inner shroud 90 is formed to protrude to the front of the fuel tank 29, and is inclined downward as it goes inward from the outside in the vehicle width direction. Since it has the width direction inclined surface 92 and the joint part 100 of the inclined wall 91 and the upper end of the outer shroud 80 is formed flush, the flow of traveling wind on the inclined wall 91 can be made smooth, and air It is possible to prevent the accumulation. As a result, when the vehicle 10 is rolled, it is possible to avoid the inclined wall 91 from becoming air resistance, so that the motion characteristics of the motorcycle 10 can be enhanced.

  As a modification of the present embodiment, as shown in FIGS. 15 to 18, the ventilation hole 97 is disposed at a position covered with the rear wall 81 of the outer shroud 80 in the vehicle rear view, and the outer shroud 80 The opening 82 may be disposed outside and below the ventilation hole 97 in the vehicle width direction. Moreover, the arrows in FIGS. 15 to 17 represent the flow of the traveling wind.

  Further, in the present modification, as shown in FIG. 15, the ventilation hole 97 is formed so that the longitudinal direction thereof coincides with the left-right direction of the vehicle in the rear view of the vehicle.

  Further, in the present modification, as shown in FIG. 16, the ventilation hole 97 is formed in front of the opening 82 of the outer shroud 80 in a vehicle side view.

  Moreover, in this modification, the ventilation hole 97 is formed in the upper part of the rear wall 94 of the inner shroud 90, as shown in FIG. The vent hole 97 is formed such that the longitudinal direction thereof coincides with the vehicle front-rear direction in a side view of the vehicle. Further, the ventilation hole 97 is formed in the vicinity of the lower part of the concave upper wall 93 a that constitutes the concave part 93 of the inner shroud 90.

  According to this modification, the ventilation hole 97 is covered with the rear wall 81 of the outer shroud 80 in the rear view of the vehicle, so that the ventilation hole 97 can be hidden from the appearance and the appearance of the motorcycle 10 is improved. can do. Further, since the opening 82 is disposed outward and downward in the vehicle width direction of the ventilation hole 97, the traveling wind can be guided outward and downward in the vehicle width direction (see FIG. 15), and the windproof effect for the user is achieved. In addition, it is possible to promote the separation of the traveling wind on the surface of the outer shroud 80 and to impart lightness to the steering of the motorcycle 10.

DESCRIPTION OF SYMBOLS 10 Motorcycle 11 Body frame 12 Head pipe 13 Main frame 28 Seat 29 Fuel tank 29c Concave part (2nd recessed part)
DESCRIPTION OF SYMBOLS 50 Engine 53 Cylinder block 54 Cylinder head 55 Cylinder head cover 58 Cooling fin 70 Shroud 80 Outer shroud 81 Rear wall 82 Opening 90 Inner shroud 91 Inclined wall 92 Width direction inclined surface 93 Recessed part (1st recessed part)
94 Rear wall 95 Air guide plate 96 Convex part 97 Ventilation hole 100 Joint part WF Front wheel S Cylinder axis

Claims (9)

A head pipe that freely steers the front wheel,
A frame extending backward from the head pipe;
A seat disposed above the frame and from substantially the center of the frame to the rear;
A fuel tank disposed above the frame and between the head pipe and the seat;
An engine suspended on the frame below the fuel tank;
In a motorcycle comprising a shroud provided on both side surfaces in the vehicle width direction of the fuel tank,
Cooling fins are provided on the surface of the engine,
A lower end of the shroud extends to a cylinder block of the engine, and an inner surface of the shroud extends toward the cooling fin ;
Forming a first recess recessed in a direction away from the engine on the inner surface of the rear side of the shroud;
The motorcycle according to claim 1, wherein a rear wall of the first recess extends toward the cooling fin . The engine is arranged with the cylinder axis inclined forward,
2. The motorcycle according to claim 1, wherein the rear edge of the shroud is disposed in front of the cylinder axis at a position where the rear edge of the shroud is opposed to the cooling fin in a side view of the vehicle. The shroud is composed of an outer shroud and an inner shroud that can be divided in the vehicle width direction,
Forming the first recess in the inner shroud;
Exposing a rear wall of the first recess from an opening provided in a rear portion of the outer shroud;
The motorcycle according to claim 1 , wherein a convex portion protruding outward is formed on a rear wall of the first concave portion. The motorcycle according to claim 1 , wherein a ventilation hole is provided in a rear wall of the first recess. The shroud is composed of an outer shroud and an inner shroud that can be divided in the vehicle width direction,
In vehicle side view,
A rear wall of the outer shroud is formed in a generally U shape projecting forward;
The motorcycle according to claim 1, wherein a rear wall of the outer shroud is formed to extend outward from a side surface of the fuel tank in a vehicle width direction. An inclined wall is formed on the front upper portion of the shroud so as to face the front of the vehicle and to incline upward from the front toward the rear.
2. The motorcycle according to claim 1, wherein a second recess is formed in an upper portion of the fuel tank, the second recess being inclined upward from the front to the rear, continuously with the inclined wall. The shroud is composed of an outer shroud and an inner shroud that can be divided in the vehicle width direction,
Forming the inclined wall on the inner shroud;
The inclined wall is formed to protrude to the front of the fuel tank, and has a width direction inclined surface that is inclined downward as it goes from the outside in the vehicle width direction toward the inside,
The motorcycle according to claim 6 , wherein a joint portion between the inclined wall of the inner shroud and an upper end of the outer shroud is formed to be flush with each other. The shroud is composed of an outer shroud and an inner shroud that can be divided in the vehicle width direction,
Forming the first recess in the inner shroud;
Exposing a rear wall of the first recess from an opening provided in a rear portion of the outer shroud;
The vent hole is covered with a rear portion of the outer shroud in a vehicle rear view,
The motorcycle according to claim 4 , wherein the opening is disposed outside and below the ventilation hole in the vehicle width direction. The motorcycle according to claim 1, wherein a ventilation hole is provided in an upper wall of the first recess.

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