JP2010159042A - Motorcycle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress mud water or the like from splashing to a cylinder and a footrest and reduce useless air resistance in an underbone type motorcycle. <P>SOLUTION: The motorcycle is provided with a front wheel 3 disposed at the front of the cylinder 32 and the footrest 40 disposed on the right and left of a crank case 31. A vehicle body cover of the motorcycle has a center guard 123c for covering the cylinder 32 from the lower side and a pair of right and left side guards 123d which are disposed so as to expand from the center guard 123c to the outside in the vehicle width direction, and disposed at the position lower than the footrest 40. The rear edge 123a of the center guard 123c is positioned in front of the crank case 31, and at least a part of the side guard 123d is positioned at the outside in the vehicle width direction rather than the straight line connecting a grounding surface to be contact to the ground of the front wheel 3 and end parts 40m, 40n of the central side in the vehicle width direction of the footrest 40. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a motorcycle, and more particularly to a technique for suppressing muddy water or the like from being applied to an engine and a footrest.

  2. Description of the Related Art Conventionally, there is a so-called underbone type motorcycle having a down tube extending rearward and obliquely downward from a head pipe that supports a steering shaft, and an engine disposed below the down tube. In the underbone type motorcycle described in Patent Document 1, the engine is disposed such that the cylinder faces forward, and footrests are disposed on the left and right sides of the crankcase located behind the cylinder. Further, in this motorcycle, a plate-like under guard that prevents the muddy water wound up by the front wheels from being applied to the engine is disposed below the engine. The under guard extends from the front of the cylinder head of the engine to the rear below the cylinder and the crankcase.

JP 2006-27397 A

  However, in the motorcycle disclosed in Patent Document 1, the under guard reaches the rear end of the crankcase. Therefore, when the vehicle travels, the air flow that passes between the cylinder and the under guard and cools the cylinder is regulated by the under guard until it reaches the rear end of the crankcase, and air resistance is wasted. It was happening. That is, after the cylinder is cooled, the air flow toward the lower side of the vehicle body is obstructed by the under guard.

  Further, since the width of the under guard is smaller than the positions of the footrests arranged on the left and right sides of the crankcase, it is easy for muddy water or the like to be applied to the footrest when the vehicle travels on a rough road.

  The present invention has been made in view of the above problems, and an object of the present invention is to prevent muddy water and the like from being applied to a cylinder and a footrest in an underbone type motorcycle and to reduce useless air resistance. Provide motorcycles.

  In order to solve the above problems, a motorcycle according to the present invention is disposed below a down tube extending rearward and obliquely downward from a head pipe supporting a steering shaft, and an engine having a cylinder in front of a crankcase; The front wheel arrange | positioned ahead of the said cylinder, and the footrest arrange | positioned at the right and left of the said crankcase. The motorcycle includes a center guard portion that covers the cylinder from below, and a pair of left and right side guard portions that are disposed so as to spread outward from the center guard portion in the vehicle width direction and are positioned lower than the footrest. A vehicle body cover is provided. The rear edge of the center guard part is located in front of the crankcase, and at least a part of the side guard part is a grounding surface that is a part in contact with the ground of the front wheel, and a center side of the footrest in the vehicle width direction. It is located on the outer side in the vehicle width direction from the straight line connecting the ends.

  According to the present invention, the center guard part and the side guard part can suppress the muddy water and the like from being applied to the cylinder and the footrest. Further, the rear edge of the center guard portion is located in front of the crankcase. Therefore, the air that cools the cylinder and flows rearward is allowed to go downward of the vehicle body beyond the rear edge of the center guard portion, so that generation of useless air resistance can be suppressed.

1 is a side view of a motorcycle according to an embodiment of the present invention. Fig. 2 is a front view of the motorcycle. FIG. 2 is a perspective view of a body frame and a footrest that the motorcycle has. Fig. 3 is a bottom view of an under cover, an engine, and a footrest that the motorcycle has. FIG. 3 is an exploded perspective view of a vehicle body cover included in the motorcycle. It is a top view of the footrest. It is a perspective view which shows the positional relationship of the said footrest and a vehicle body cover, In the same figure, the side cover, cylinder side cover, crankcase cover, and footrest which are arrange | positioned at the left side of an under cover and a vehicle body are shown. It is a side view which shows the positional relationship of the said under cover, a footrest, and a front wheel. It is a perspective view which faces the said engine, an under cover, and a cylinder side cover from diagonally forward. FIG. 3 is a perspective view of the engine and the cylinder side cover that are viewed from diagonally forward in a disassembled state. It is a figure which shows the positional relationship of the said under cover and a footrest, and is a figure which faces these from the front. FIG. 6 is a side view of a motorcycle according to another embodiment of the present invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view of a motorcycle 1 as an example of an embodiment of the present invention, and FIG. 2 is a front view of the motorcycle 1. FIG. 3 is a perspective view of the body frame 20 and the footrest 40 of the motorcycle 1. FIG. 4 is a bottom view of the under cover 120, the engine 30, and the footrest 40 included in the motorcycle 1. FIG. 5 is an exploded perspective view of the vehicle body cover 100 of the motorcycle 1.

  As shown in FIG. 1 or FIG. 2, the vehicle body frame 20 has a head pipe 26 that supports the steering shaft 6 at the front end thereof. A handle 7 is attached to the upper end of the steering shaft 6, and grips 7 a and 7 b are provided at both ends of the handle 7. A front suspension 8 is connected to the lower end of the steering shaft 6, and the front wheel 3 is supported by the lower end of the front suspension 8. The steering wheel 7, the steering shaft 6, the front suspension 8, and the front wheel 3 are connected to each other so as to rotate integrally, whereby the motorcycle 1 can be steered by the steering operation of the passenger.

  The motorcycle 1 is a so-called underbone type motorcycle, and as shown in FIG. 1 or FIG. 3, the body frame 20 is disposed at the center in the vehicle width direction (direction indicated by Dw) and is located behind the head pipe 26 and The down tube 22 extends obliquely downward and reaches the lower side of the sheet 5. In the motorcycle 1, a device such as a fuel tank is not disposed between the seat 5 and the head pipe 26 located in front of the seat 5 (direction indicated by Df). A space is provided above the down tube 22.

  The vehicle body frame 20 has a pair of left and right seat frames 23 extending rearward and obliquely upward from a position in the middle of the down tube 22. The seat 5 is disposed on the seat frame 23 and supported by the seat frame 23. The vehicle body frame 20 includes a backstay 29 that extends obliquely upward from the rear end of the down tube 22 and is connected to the seat frame 23.

  As shown in FIG. 1 or FIG. 4, the engine 30 includes a cylinder 32, a cylinder head 33, and a crankcase 31 having a larger width than the cylinder 32. The cylinder 32 and the cylinder head 33 are disposed in front of the crankcase 31, and the engine 30 is disposed such that the cylinder 32 faces forward. In this example, the cylinder 32 faces forward and is slightly inclined upward with respect to the horizontal direction (direction indicated by Df-Dr in FIG. 1). The front wheel 3 is located in front of the cylinder 32. The engine 30 is disposed below the down tube 22 and is supported from above by the down tube 22 (see FIG. 3). Specifically, brackets 22a and 22b are provided in the middle of the down tube 22, and a crankcase 31 is fixed to the brackets 22a and 22b.

  A transmission and a clutch are accommodated in the crankcase 31. In this example, the transmission is a belt-type continuously variable transmission. As shown in FIG. 4, a drive pulley 34 that rotates integrally with a crankshaft (not shown) is provided in the crankcase 31 as a transmission. And a driven pulley 35 whose rotation is transmitted from the driving pulley 34 by the belt 36. The driving pulley 34 and the driven pulley 35 are arranged at positions offset outward from the center in the vehicle width direction. Crankcase covers 151 and 152 are disposed on the left and right sides of the crankcase 31, and the crankcase 31 is covered with the crankcase covers 151 and 152 (see FIGS. 1 and 5). The driving force output from the engine 30 is transmitted to the rear wheel 4 via a chain (not shown) disposed in the case 9 (see FIG. 1).

  As shown in FIG. 1, a swing arm 12 extending in the front-rear direction is disposed behind the engine 30. Further, after the engine 30, a pair of left and right rear frame portions 24, 24 extending downward from the rear end of the down tube 22 are disposed (see FIG. 3). The front end of the swing arm 12 is supported by the rear frame portions 24 and 24 via a pivot (not shown). The axle of the rear wheel 4 is supported by the rear end of the swing arm 12, and the rear wheel 4 and the swing arm 12 can swing up and down around the pivot.

  Footrests 40 are disposed on the left and right sides of the crankcase 31 (see FIGS. 1 to 4). FIG. 6 is a plan view of the footrest 40 disposed on the left side of the crankcase 31. The footrest 40 shown in this example is a flat footrest formed so as to extend in the front-rear direction, and the length of the footrest 40 in the front-rear direction (the distance between the foremost position and the rearmost position in the footrest 40). ) L is longer than the length W in the vehicle width direction (the distance between the position closer to the center in the vehicle width direction and the outermost position) W. Further, the footrest 40 has a substantially triangular shape in a plan view, and as an outer side surface 40b that is an outer side surface in the vehicle width direction, a front side surface 40c extending obliquely forward and a rear side surface 40d extending diagonally rearward. And have. The front side surface 40c extends obliquely forward toward the center in the vehicle width direction from the outermost surface 40a, which is a portion positioned on the outermost surface in the vehicle width direction on the outer surface 40b. The rear side surface 40d extends obliquely rearward from the outermost surface 40a toward the center in the vehicle width direction.

  An inner side surface 40e that is a side surface on the center side in the vehicle width direction of the footrest 40 extends substantially linearly in the front-rear direction along the side surface of the crankcase 31 (see FIG. 4). The inner side surface 40e is adjacent to the crankcase cover 151, 152 when the crankcase cover 151, 152 is attached to the crankcase 31. A front side surface 40f that extends obliquely forward toward the outer side in the vehicle width direction and reaches the front end 40h of the footrest 40 is provided at the front portion of the inner side surface 40e.

  As shown in FIG. 3 or 4, the left and right footrests 40 are supported by both ends of a stay 70 disposed below the crankcase 31. Specifically, the stay 70 includes a pipe portion 74 extending in the vehicle width direction below the crankcase 31, and plate-like support plates 72 fixed to both ends of the pipe portion 74 by welding. . The footrest 40 is disposed on the support plate 72 and attached to the support plate 72 with a plurality of bolts.

  As shown in FIG. 3, the stay 70 is attached to the rear frame portions 24 and 24 via a pair of left and right stay support members 27 and 28 provided on the vehicle body frame 20. Specifically, plate-like mounting plates 71 and 71 are fixed to the pipe portion 74 at two positions separated in the vehicle width direction. On the other hand, the stay support members 27, 28 have horizontal plate portions 27b, 28b and vertical plate portions 27a, 28a rising from the edges of the horizontal plate portions 27b, 28b. The mounting plate 71 is disposed so as to face the horizontal plate portions 27b and 28b in the vertical direction, and is attached to the horizontal plate portions 27b and 28b. The vertical plate portions 27 a and 28 a are disposed on the rear frame portions 24 and 24 on the outer side in the vehicle width direction and attached to the rear frame portion 24.

  The vehicle body cover 100 will be described in detail. As shown in FIG. 5, the vehicle body cover 100 includes a front cover 110 and an under cover 120. The vehicle body cover 100 includes a pair of left and right front side covers 130 and 130, cylinder side covers 140 and 140, and crankcase covers 151 and 152. In addition, these are shape | molded with resin.

  FIG. 7 is a perspective view showing the positional relationship between the footrest 40 and the vehicle body cover 100. In the figure, the front side cover 130, the cylinder side cover 140, the crankcase cover 151, And a footrest 40 is shown. FIG. 8 is a side view showing the positional relationship among the under cover 120, the footrest 40 and the front wheel 3. FIG. 9 is a perspective view of the engine 30, the under cover 120, and the cylinder side cover 140 as they face obliquely from the front. FIG. 10 is a perspective view in which the engine 30 and the cylinder side cover 140 are disassembled and faced obliquely from the front. FIG. 11 is a view showing the positional relationship between the undercover 120 and the footrest 40, and is a view of these from the front.

  As shown in FIG. 1, the front cover 110 is disposed in front of the head pipe 26, extends upward from the lower edge of the front cover 110 and is inclined rearward. Further, a back cover 160 is disposed after the head pipe 26. The back cover 160 covers the head pipe 26 from the rear and extends rearward and obliquely downward along the down tube 22 to reach the lower side of the front end 5 a of the seat 5. The down tube 22 is covered from above by a back cover 160.

  The front side cover 130 is located below the front cover 110 and the back cover 160 and obliquely above the front wheel 3 in a side view of the vehicle body. The front side covers 130 are disposed on the left and right sides of the vehicle body and cover the front part of the vehicle body from the left and right. The front side cover 130 has a side panel portion 131 and an inner panel portion 132 (see FIG. 5).

  The side panel 131 has a plate shape that spreads outward in the vehicle width direction on the left and right of the front wheel 3 in a front view of the vehicle body (see FIG. 2). Further, as shown in FIGS. 1 and 7, the side panel portion 131 has a triangular shape that is long in the vertical direction in a side view of the vehicle body, extends obliquely downward from a position higher than the front wheels 3, and the height of the footrest 40. Has reached to. That is, the front end (upper end) 131a of the side panel portion 131 is located above the front wheel 3, the side panel portion 131 extends obliquely downward from the front end 131a, and the lower end 131b thereof is located in front of the footrest 40. Therefore, the lower portion 131 e of the side panel portion 131 is located between the footrest 40 and the front wheel 3.

  As shown in FIG. 2, the side panel portion 131 covers the front portion of the vehicle body from the left and right sides, and is disposed obliquely so that the airflow received during traveling can be guided to the outside in the vehicle width direction. That is, the side panel portion 131 is disposed obliquely so that the rear edges 131f and 131g of the side panel portion 131 are located on the outer side in the vehicle width direction from the front edge 131c. Further, the upper portion of the side panel portion 131 extends outward from the front end 131a in the vehicle width direction, and the lower portion 131e of the side panel portion 131 curves toward the center in the vehicle width direction (hereinafter referred to as the vehicle body width center) C0 as it goes downward. is doing.

  As shown in FIG. 5, the inner panel portion 132 is disposed inside the side panel portion 131. The inner panel portion 132 extends rearward from the front edge (the edge on the vehicle body width center C0 side) 131c of the side panel portion 131 and is inclined toward the vehicle body width center C0 side. As a result, the inner panel portion 132 can guide the airflow received during traveling to the vehicle body width center C0 side. In this example, a cylinder 32 and a cylinder head 33 are disposed behind the front wheel 3, and the inner panel portion 132 guides the air flow to the cylinder 32 and the cylinder head 33.

  As shown in FIG. 4 or 9, the under cover 120 is a cover that is disposed behind the front wheel 3 and covers the lower part of the vehicle body from the front and the bottom. The under cover 120 has a plate-like under guard portion 123 that extends in the vehicle width direction below the cylinder 32. The under guard portion 123 has a center guard portion 123c that is located below the cylinder 32 and covers the cylinder 32 from below at the center in the vehicle width direction. The rear edge 123a of the center guard portion 123c is located in front of the crankcase 31. Specifically, the crankcase 31 is provided with a front surface 31a that hangs downward from the base portion 32a of the cylinder 32 and faces the traveling direction of the motorcycle 1 (see FIG. 10). As shown in FIG. 4, the rear edge 123 a is located below the cylinder 32 and is located away from the front surface 31 a of the crankcase 31. Further, the front edge 123e of the center guard portion 123c is located in front of the cylinder head 33 in the bottom view of the vehicle body.

  As shown in FIG. 5 or FIG. 9, the under cover 120 has a front guard portion 122 that covers the cylinder 32 from the front. The front guard portion 122 extends upward from the front edge 123e of the center guard portion 123c and is inclined rearward and is positioned in front of the cylinder 32. The front guard part 122 is located below the cylinder head 33, and the cylinder head 33 is exposed forward from the upper edge 122 a of the front guard part 122. As a result, when the motorcycle 1 travels, the air flow that passes rearward between the left and right inner panel portions 132 passes over the front guard portion 122 and reaches the cylinder head 33 and the cylinder 32. Then, the air flow that has passed under the cylinder head 33 and the cylinder 32 is discharged below the vehicle body from between the rear edge 123a of the center guard portion 123c and the front surface 31a of the crankcase 31.

  The front guard portion 122 is formed with a hole 122 d that penetrates the front guard portion 122. The hole 122d is a long hole formed so as to extend in the vehicle width direction, and has a substantially V shape in a front view of the front guard portion 122. The hole 122d prevents water and the like flowing upward on the front guard portion 122 from receiving the traveling wind during traveling of the motorcycle 1 from reaching the upper edge 122a. The upper edge 122a also has a substantially V shape corresponding to the lower surface of the cylinder head 33, and the central portion of the upper edge 122a is lower than both ends thereof. A mounting hole 132a is formed in the lower portion of the inner panel portion 132 described above. The mounting hole 132a and the mounting hole 122c formed in the front guard portion 122 are fixed to each other by a bolt or the like.

  As described above, the under guard portion 123 has a plate shape formed so as to extend in the vehicle width direction, and in addition to the center guard portion 123c, a pair of left and right side guards extending outward from the center guard portion 123c in the vehicle width direction. It has parts 123d and 123d. The side guard part 123d is arranged at a position lower than the footrest 40, and at least a part of the side guard part 123d is a grounding surface that is a part in contact with the ground of the front wheel 3, and an end part of the footrest 40 on the vehicle body width center C0 side. It is located outside of the straight line connecting

  In the example described here, the footrest 40 is a flat footrest formed so as to extend in the front-rear direction as described above, and the outer portion of the side guard portion 123d in the vehicle width direction is in contact with the front wheel 3. The center 3a and the footrest are located outside a straight line L1 that connects the center 3a of the ground (a portion of the front wheel 3 positioned below the axle 3b in the vertical direction) 3a and the front end 40m of the inner surface 40e of the footrest 40. It is located outside the straight line L2 connecting the rear end portion 40n of the inner side surface 40e of 40 (see FIGS. 4, 8, and 11). That is, an outer edge (hereinafter referred to as an outer edge) 123f in the vehicle width direction of the side guard portion 123d is located outside the straight lines L1 and L2 (see FIG. 7, FIG. 9, or FIG. 11). As a result, when the motorcycle 1 travels, the side guard portion 123d prevents the muddy water or the like that is rolled up rearward from the ground contact surface from reaching the footrest 40. Further, as shown in FIG. 11, in the front view of the vehicle body, the portion of the footrest 40 on the vehicle body width center C0 side is located closer to the vehicle body width center C0 than the outer edge 123f of the side guard portion 123d.

  Furthermore, the side guard portion 123d is also located on a straight line connecting the front end 40h of the footrest 40 and the center 3a of the ground contact surface. As a result, the side guard portion 123d prevents the muddy water and the like from being applied to the front end 40h of the footrest 40 and the toes of the passenger's feet placed on the footrest 40.

  As shown in FIG. 9, the side guard portion 123d extends outward in the vehicle width direction and is inclined upward. Specifically, the front edge 123g of the side guard portion 123d extends outward in the vehicle width direction from the front edge 123e of the center guard portion 123c and is inclined upward, whereby the outer edge 123f of the side guard portion 123d. Is higher than the center guard portion 123c. The side guard portion 123d extends rearward and obliquely downward from the front edge 123g. As a result, the airflow that has passed through the side of the front wheel 3 and arrived at the side guard portion 123d is smoothly guided rightward or leftward below the vehicle body.

  Further, as shown in FIG. 7, the under cover 120 has an upper guard portion 121 extending upward from the front edge 123g of the side guard portion 123d along the rear edge 131g of the lower portion 131e of the side panel portion 131. ing. The upper guard portion 121 protrudes outward in the vehicle width direction from the rear edge 131g of the side panel portion 131 in the front view of the vehicle body, and the outer edge 121b of the upper guard portion 121 in the vehicle width direction is the side panel portion. 131 is located outside the rear edges 131f and 131g (see FIG. 2 or FIG. 7).

  The upper guard portion 121 extends upward from the front edge 123g of the side guard portion 123d and is inclined rearward. As a result, the air resistance generated by the upper guard 121 when the motorcycle 1 is traveling is reduced. The center in the width direction of the upper guard portion 121 swells, and the top portion 121d of the upper guard portion 121 is located on the outer side in the vehicle width direction from the lower portion 131e of the side panel portion 131 (see FIG. 7). ). The front guard portion 122 described above is disposed between the lower portions of the left and right upper guard portions 121 and covers the vehicle body together with the upper guard portion 121 from the front.

  Such an undercover 120 having a side guard part 123 d, a center guard part 123 c, an upper guard part 121, and a front guard part 122 is formed integrally and supported by the engine 30 via a stay 39. The support structure of the under cover 120 will be described in detail later.

  As shown in FIG. 4 or 9, the cylinder side cover 140 has a lower guard portion 141 that extends rearward from the side guard portion 123 d and reaches a position below the footrest 40. That is, the lower guard part 141 extends rearward from the side guard part 123d, and the rear part is located below the footrest 40. And the rear edge 141c of the lower guard part 141 is located behind the center of the front-back direction of the footrest 40 (refer FIG. 4). Further, the rear edge 141 c is located at a position below the support plate 72. Accordingly, the lower guard portion 141 suppresses mud and the like wound up by the front wheel 3 from hitting the footrest 40 and the support plate 72. In addition, the front edge 141a of the lower guard part 141 is adjacent to the rear edge 123i of the side guard part 123d, and the lower guard part 141 is flush with the side guard part 123d.

  The lower guard portion 141 is supported by the vehicle body frame 20. Specifically, as shown in FIG. 4 or 5, brackets 27 e and 28 e extending outward in the vehicle width direction are provided on the stay support members 27 and 28 provided at the lower portion of the vehicle body frame 20. On the other hand, an attachment portion 141b is formed at the rear portion of the lower guard portion 141, and the attachment portion 141b is attached to the brackets 27e and 28e with bolts or the like (see FIG. 10).

  As shown in FIG. 7 or FIG. 9, the cylinder side cover 140 has a side cover part 142 that is located behind the upper guard part 121 and in front of the footrest 40 and covers the cylinder 32 from the side. ing. The side cover portion 142 is formed with two discharge ports 142a and 142a arranged vertically. As a result, when the motorcycle 1 travels, an air flow that passes through the side surfaces of the cylinder head 33 and the cylinder 32 and travels backward is discharged from the discharge ports 142a and 142a to the outside in the vehicle width direction.

  As shown in FIG. 7, the lower part 142b of the side cover part 142 extends outward in the vehicle width direction. The lower edge 142c of the lower part 142b extends rearward and outward in the vehicle width direction from the rear edge 123i of the side guard part 123d and reaches the front end 40h of the footrest 40. The rear end of the lower edge 142c and the front side surface 40c of the footrest 40 are generally flush with each other, and the rear surface of the lower portion 142b of the side cover 142 is along the front side surface 40f of the inner side surface 40e of the footrest 40. Is arranged (see FIG. 6).

  As described above, the under cover 120 is integrally formed and supported by the stay 39 attached to the engine 30. In this example, as shown in FIG. 10, the stay 39 is fixed to the pipe 39a in front of the front surface 31a of the crankcase 31 and the pipe 39a extending in the vehicle width direction so as to face the vehicle width direction. A pair of left and right plate-like brackets 39b and 39b are provided. The brackets 39b and 39b are attached to the front surface 31a of the crankcase 31 with a plurality of bolts. A plate-like bracket 39c extending forward is fixed to both ends of the pipe portion 39a. An attachment portion 123h formed on the side guard portion 123d and an attachment portion 140d provided so as to extend forward from the cylinder side cover 140 are fixed to the bracket 39c with a common bolt (not shown). (See FIGS. 9 and 10).

  In addition to the bracket 39c, both end portions of the pipe portion 39a are provided with attachment portions 39e that extend outward in the vehicle width direction and are inclined upward. On the other hand, an attachment portion 142e is provided on the lower portion 142b of the side cover portion 142, and the attachment portion 142e is attached to the attachment portion 39e. As described above, the under cover 120 and the cylinder side cover 140 are supported by the engine 30 via the stay 39.

  As described above, in the motorcycle 1, the vehicle body cover 100 extends from the center guard portion 123c to the outside in the vehicle width direction and covers the cylinder 32 from below, and is disposed at a position lower than the footrest 40. It has a pair of left and right side guard parts 123d. The rear edge 123a of the center guard part 123c is located in front of the crankcase 31, and at least a part of the side guard part 123d is a part of the front wheel 3 that is in contact with the ground surface and the footrest 40 on the vehicle body width center C0 side. It is located on the outer side in the vehicle width direction from the straight lines L1, L2 connecting the end portions 40m, 40n.

  According to such a motorcycle 1, it is possible to prevent muddy water or the like from being applied to the cylinder 32 and the footrest 40. In addition, the airflow that has passed under the cylinder head 33 and the cylinder 32 is discharged to the lower side of the vehicle body from between the rear edge 123a of the center guard portion 123c and the crankcase 31. This can reduce wasteful air resistance as compared with a conventional motorcycle in which a guard disposed below the engine extends to the rear end of the crankcase.

  Further, the vehicle body cover 100 has a lower guard portion 141 that extends rearward from the side guard portion 123d and is positioned below the footrest 40. Thereby, it can suppress more effectively that muddy water etc. are applied to the footrest 40.

  The vehicle body cover 100 has a front guard portion 122 that covers the cylinder 32 from the front. Thereby, it can suppress more effectively that muddy water etc. are applied to the cylinder 32.

  Further, the front guard part 122 extends upward from the front edge 123e of the center guard part 123c and is inclined rearward, and a hole 122d is formed at a position in the middle thereof. Thus, when the motorcycle 1 is traveling, it is possible to prevent water flowing upward on the front guard portion 122 from receiving the traveling wind from reaching the upper edge 122a of the front guard portion 122.

  Further, the side guard portion 123d extends outward in the vehicle width direction and is inclined upward. This can reduce the air resistance generated by the side guard portion 123d when the motorcycle 1 is traveling.

  Further, the vehicle body cover 100 includes an upper guard portion 121 that extends upward from the front edge 123g of the side guard portion 123d. Thereby, it can suppress that muddy water etc. are applied to the passenger | crew's leg mounted on the footrest 40. FIG.

  Further, the vehicle body cover 100 has a side panel portion 131, and the side panel portion 131 extends in the vertical direction in a side view of the vehicle body, and the lower portion 131 e is disposed between the footrest 40 and the front wheel 3. Has been. The upper guard portion 121 is located on the outer side in the vehicle width direction from the side panel portion 131. Thereby, it can suppress more effectively that muddy water etc. are applied to the passenger | crew's leg mounted on the footrest 40. FIG.

  In the motorcycle 1, the side guard portion 123 d and the center guard portion 123 c are integrally formed and supported by a stay 39 attached to the engine 30. Thereby, the change of the relative position of the side guard part 123d and the center guard part 123c with respect to the engine 30 can be suppressed.

  The present invention is not limited to the motorcycle 1 described above, and various modifications can be made. For example, in the motorcycle 1, the center guard portion 123c and the side guard portion 123d are integrally formed. However, these guard portions may be formed separately. In this case, the side guard portion 123d may be formed integrally with the cylinder side cover 140 and the front side cover 130.

  In the above description, the under guard portion 123 is curved so that the position of the center guard portion 123c is lower than the positions of the side guard portions 123d and 123d. However, the underguard portion 123 may have a plate shape extending in one direction below the cylinder 32.

  In the above description, the footrest 40 is a flat footrest formed so as to extend in the front-rear direction. However, the present invention may be applied to a motorcycle having a rod-like footrest. FIG. 12 is a side view of a motorcycle 1A which is an example of this embodiment. In the figure, the same parts as those of the motorcycle 1 are denoted by the same reference numerals.

  As shown in FIG. 12, the motorcycle 1A has an engine 30A. The engine 30A includes a crankcase 37, a cylinder 38, and a cylinder head 36. The crankcase 37 accommodates a gear-type transmission composed of a plurality of gears provided so as to be movable in the axial direction, and a shift lever 41 for moving the gears is disposed along the side surface of the crankcase 37. ing. The transmission lever 41 is a plate-like member that is long in the front-rear direction, and pedal portions 41 a and 41 b are formed at the front end and the rear end thereof. The gear ratio is switched by selectively stepping on the pedal portion 41a and the pedal portion 41b by the passenger. In addition, footrests 42 are disposed on the left and right sides of the crankcase 37. The footrest 42 is located between the pedal portion 41a and the pedal portion 41b. Unlike the above-described footrest 40, the footrest 42 is a rod-like footrest that is long in the vehicle width direction. The footrest 42 is supported by a rod-like stay 43 that extends outward from the lower side of the crankcase 37 in the vehicle width direction.

  Similar to the vehicle body cover 100 described above, the vehicle body cover 100A of the motorcycle 1A includes a front cover 110, a front side cover 130, and a back cover 160. Further, the vehicle body cover 100A has an under cover 120A. The under cover 120 </ b> A is a cover that covers the cylinder 38 from below, and has a center guard portion positioned below the cylinder 38 in the same manner as the center guard portion 123 c described above.

  In addition, the under cover 120A has a projecting portion 125 that projects outward from the lower edge 131h of the front side cover 130 in the vehicle width direction at the lower portion thereof. The overhanging portion 125 includes an underside guard portion 125a that spreads outward from the center guard portion in the vehicle width direction, and a side cover portion 125b that is disposed so as to cover the cylinder 38 from the side. The underside guard part 125a is located at a position lower than the footrest 42, and the rear part of the underside guard part 125a connects the center 3a of the ground contact surface of the front wheel 3 and the end of the footrest 42 on the center side in the vehicle width direction. It is located outside the straight line L3 in the vehicle width direction. In the motorcycle 1A, a part of the underside guard portion 125a is located on the outer side in the vehicle width direction from a straight line L3 connecting the pedal portions 41a and 41b and the center 3a of the ground contact surface. Thus, even when the passenger puts his / her foot on the pedal portions 41a and 41b, muddy water or the like is prevented from being applied to the passenger's foot. The under cover 120A has a plate-like upper side cover portion 126 extending upward from the side cover portion 125b in addition to the under side guard portion 125a and the like, and these are integrally formed.

  1, 1A Motorcycle, 3 Front wheel, 3a Center of ground contact surface of front wheel, 3b Axle, 4 Rear wheel, 5 Seat, 20 Body frame, 22 Down tube, 23 Seat frame, 24 Rear frame, 26 Head pipe, 27, 28 stay support member, 29 back stay, 30, 30A engine, 31, 37 crankcase, 31a front surface, 32, 38 cylinder, 33, 36 cylinder head, 39 stay, 40, 42 footrest, 40e inner surface, 40m inner surface Front end, rear end of 40n inner surface, 41 shift lever, 70, 43 stay, 71 mounting plate, 72 support plate, 74 pipe, 100, 100A body cover, 110 front cover, 120, 120A under cover, 121 top Guard part, 122 Front guard part, 1 2d hole, 123 under guard part, 123a trailing edge, 123c center guard part, 123d side guard part, 125 overhang part, 125a under side guard part, 125b side cover part, 126 upper side cover part, 130 front side cover, 131 side Panel portion, 132 Inner panel portion, 140 Cylinder side cover, 141 Lower guard portion, 142 Side cover portion, 142a Discharge port, 151, 152 Crankcase cover, 160 Back cover, C0 vehicle body width center, L1 Front wheel center A straight line connecting the front end of the inner surface of the footrest with the straight line connecting the center of the ground contact surface of the L2 front wheel and the rear end of the inner surface of the footrest, L3 The center of the ground contact surface of the front wheel and the center of the footrest in the vehicle width direction A straight line connecting the ends of

Claims (8)

An engine having a cylinder in front of a crankcase, disposed below a down tube extending rearward and obliquely downward from a head pipe supporting a steering shaft;
A front wheel disposed in front of the cylinder;
Footrests disposed on the left and right of the crankcase;
A vehicle body cover having a center guard portion that covers the cylinder from below, and a pair of left and right side guard portions that are disposed so as to spread outward from the center guard portion in the vehicle width direction and are positioned lower than the footrest. Prepared,
The rear edge of the center guard part is located in front of the crankcase,
At least a part of the side guard portion is located on the outer side in the vehicle width direction from a straight line connecting a ground contact surface that is a portion in contact with the ground of the front wheel and an end portion on the center side in the vehicle width direction of the footrest.
Motorcycle characterized by that. The motorcycle according to claim 1,
The vehicle body cover further includes a lower guard portion extending rearward from the side guard portion and positioned below the footrest.
Motorcycle characterized by that. The motorcycle according to claim 1,
The vehicle body cover further includes a front guard portion that covers the cylinder from the front.
Motorcycle characterized by that. The motorcycle according to claim 3,
The front guard extends upward from the front edge of the center guard part and is inclined rearward, and a hole is formed in the middle of the front guard.
Motorcycle characterized by that. The motorcycle according to claim 1,
The side guard portion is inclined outward while spreading outward in the vehicle width direction.
Motorcycle characterized by that. The motorcycle according to claim 1,
The vehicle body cover has an upper guard portion extending upward from a front edge of the side guard portion,
Motorcycle characterized by that. The motorcycle according to claim 6,
The vehicle body cover extends in the vertical direction in a side view of the vehicle body, and is arranged so that a lower portion thereof is positioned between the footrest and the front wheel, and has a side panel portion that covers the vehicle body from the left and right sides,
The upper guard part is located outside the side panel part in the vehicle width direction.
Motorcycle characterized by that. The motorcycle according to claim 1,
The side guard part and the center guard part are integrally formed and supported by a stay attached to the engine.
Motorcycle characterized by that.

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