JP2010137843A - Motorcycle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the discharge efficiency of water and the like that penetrates inside the case, without inviting an increase in swelling amount downward the case in a motorcycle having a case for covering a transfer mechanism for transferring the drive power of an engine to a rear wheel. <P>SOLUTION: The motorcycle includes a drive sprocket, a driven sprocket, chains and the case 40 for covering the driven sprocket and the chains. The case 40 includes a right lower cover member 51R and a left lower cover member 51L for covering the driven sprocket and chains from the right- and left-side. The cover members 51R and 51L include a lower fringe 53R that extends in the front-back directions downward the chains, to be connected with each other. The lower fringe 53R includes partially a swelling part 53Re that swells upward, moving upward away from the lower fringe, to constitute an opening with the lower fringe. Further, the lower fringe 53R includes a rear lower fringe 53Rb that extends rearward and diagonally upward from the swelling part 53Re. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a motorcycle having a case that covers a transmission member such as a chain or a belt that transmits driving force of an engine to a rear wheel, and more particularly to a technique for efficiently discharging water or the like that has entered the case out of the case.

  Some motorcycles in which an engine is arranged in front of a rear wheel transmit engine driving force to the rear wheel by a chain wound around the engine sprocket and the rear wheel sprocket. Patent Documents 1 and 2 disclose a case that covers such a chain from above and below and from the left and right.

  Such a case generally includes a member that covers the chain from the right side (hereinafter, right cover member) and a member that covers the chain from the left side (hereinafter, left cover member). The edge of the right cover member and the edge of the left cover member are connected to each other by welding or the like, so that the chain is covered not only from the left and right but also from the top and bottom.

  In such a case, a gap is partially provided between the lower edge of the right cover member and the lower edge of the left cover member in order to discharge water or the like that has entered the case. In the conventional case, a downwardly bulging portion is formed on the lower edge of either the right cover member or the left cover member. And the clearance gap is provided between the said swelled part and the lower edge of the other cover member.

Japanese Unexamined Patent Application Publication No. 2004-98781 JP 2004-82799 A

  However, in the structure in which the lower edge of the right cover member or a part of the lower edge of the left cover member swells downward as in the conventional case described above, when trying to improve the drainage efficiency of water that has entered the case, It is necessary to increase the amount of swelling of a part of the lower edge. That is, it has been difficult to improve the discharge efficiency while suppressing the amount of bulging downward of the case.

  The present invention has been made in view of the above problems, and its object is to have a case that can improve the efficiency of discharging water or the like that has entered the case without causing an increase in the amount of bulging downward of the case. To provide a motorcycle.

  In order to solve the above-described problems, a motorcycle according to the present invention includes a drive rotating member and a driven rotating member. The drive rotating member outputs engine power. The driven rotary member is disposed at a position rearward from the drive rotary member and interlocks with a rear wheel. The motorcycle is wound around the drive rotation member and the driven rotation member, and transmits an annular transmission portion that transmits the rotation of the drive rotation member to the driven rotation member, the annular transmission member, and the driven A case covering the rotating member is provided. The case includes left and right cover members that cover the annular transmission member from the right side and the left side in the vehicle width direction. The left and right cover members have left and right lower edges that are joined together to cover the annular transmission member from below. Each of the lower edge portions has a front lower edge portion extending in the front-rear direction below the annular transmission member, and a rear lower edge portion extending rearward and obliquely upward from a position below the annular transmission member. One lower edge of the left and right lower edges has a bulge part that bulges upward and separates from the other lower edge part and forms an opening with the other lower edge part. Yes. The bulge portion is located between the front lower edge portion and the rear lower edge portion of the one lower edge portion, and the rear lower edge portion of the one lower edge portion is rearward from the bulge portion and It extends diagonally upward.

  In the present invention, the bulge portion is separated upward from the other lower edge portion and constitutes an opening together with the other lower edge portion. As a result, the efficiency of discharging water or the like that has entered the case can be improved without causing an increase in the amount of swelling downward of the case.

1 is a side view of a motorcycle as an example of an embodiment of the present invention. Fig. 2 is an enlarged view of the rear part of the motorcycle. It is a disassembled perspective view of the case which the said motorcycle has. It is a figure which faces the upper and lower left cover members from the inside of the case. It is a figure which faces the upper and lower right cover members from the inside of the case. It is sectional drawing of the case in the VI-VI line shown in FIG. It is sectional drawing of the case in the VII-VII line shown in FIG. It is sectional drawing of the case which the motorcycle concerning other embodiment of this invention has.

  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 which is an example of an embodiment of the present invention, and FIG. 2 is an enlarged view of a rear portion of the motorcycle 1. In FIG. 2, the footrest 18 for the passenger sitting behind the driver to place his / her foot is omitted.

  The motorcycle 1 includes a front wheel 3, a rear wheel 4, an engine 10, a frame 30, and a case 40. The frame 30 has, at its front end, a head pipe 31 that supports a steering shaft (not shown) connected to the handle 5 and the front fork 6. The front fork 6 supports the front wheel 3 by its lower end, and the handle 5 is rotatable to the left and right together with the steering shaft, the front fork 6 and the front wheel 3.

  The motorcycle 1 is an underbone type motorcycle, and the frame 30 has a main pipe 32 extending rearward and obliquely downward from the head pipe 31. The engine 10 is disposed below the main pipe 32 and is fixed to the main pipe 32 so that the position with respect to the frame 30 does not move.

  The frame 30 includes a rear frame portion 33 that extends downward from the rear end of the main pipe 32 and is positioned behind the engine 10, and a seat rail 34 that extends rearward and obliquely upward from a middle portion of the main pipe 32. ing. A main stand 17a and a side stand 17b for supporting the vehicle body when the motorcycle 1 is stopped are provided below the rear frame portion 33. When the motorcycle 1 is stopped, the main stand 17a is set up so that the vehicle body is supported with the rear wheel 4 being away from the ground. FIG. 1 shows the motorcycle 1 with the main stand 17a set up. The seat rail 34 supports the seat 7 disposed above the seat rail 34. A rear arm 8 extending in the front-rear direction is disposed behind the rear frame portion 33. The front end of the rear arm 8 is supported by the rear frame portion 33 via the pivot shaft 9. The rear arm 8 supports the axle 4a of the rear wheel 4 disposed behind the engine 10 by the rear end thereof. The rear wheel 4 and the rear arm 8 can move up and down with respect to the frame 30 around the pivot shaft 9. Between the rear arm 8 and the seat rail 34, a rear suspension 19 for relaxing the vertical movement of the rear wheel 4 is suspended (see FIG. 1).

  A drive sprocket (drive rotation member) 11 that outputs the drive force of the engine 10 is provided at the rear portion of the engine 10 in conjunction with an output shaft (not shown). The motorcycle 1 has a transmission mechanism 12 that transmits the driving force output from the engine 10 to the rear wheel 4. In this example, the transmission mechanism 12 includes a driven sprocket (driven rotary member) 13 and a chain (annular transmission member) 14. The driven sprocket 13 is disposed at a position away from the driving sprocket 11 rearward (in the direction indicated by Dr), and interlocks with the axle 4 a of the rear wheel 4. The chain 14 is wound around the drive sprocket 11 and the driven sprocket 13 and has a long ring shape in the front-rear direction (direction indicated by Df-Dr). The rotation of the drive sprocket 11 is transmitted to the driven sprocket 13 via the chain 14. The diameter (number of teeth) of the driven sprocket 13 is larger than the diameter (number of teeth) of the driving sprocket 11, and the rotation of the driving sprocket 11 is decelerated and transmitted to the rear wheel 4. The case 40 covers the chain 14 and the driven sprocket 13.

  The case 40 will be described. FIG. 3 is an exploded perspective view of the case 40. As shown in the figure, the case 40 has a lower case 50 that constitutes the lower part of the case 40 and an upper case 60 that constitutes the upper part of the case 40. The front end 60b of the upper case 60 and the front end 50b of the lower case 50 are located in front of the front end of the rear arm 8 (see FIG. 2). The lower case 50 accommodates the lower part of the chain 14 and the driven sprocket 13, and the upper case 60 accommodates the upper part of the chain 14 and the driven sprocket 13.

  The upper case 60 includes an upper left cover member 61L and an upper right cover member 61R, and these cover members 61L and 61R are joined to each other by welding. The lower case 50 includes a lower left cover member 51L and a lower right cover member 51R, and these cover members 51L and 51R are also joined to each other by welding. Each cover member is configured by, for example, pressing a plate-shaped member. The upper and lower left cover members 61L and 51L are arranged on the left side of the chain 14 and the driven sprocket 13 (the direction indicated by Do in FIG. 3), and the left side of the chain 14 and the driven sprocket 13 in the vehicle width direction ( It covers from the outside in the vehicle width direction. The upper and lower right cover members 61R and 51R are arranged in the right direction of the chain 14 and the driven sprocket 13 (the direction indicated by Di in FIG. 3), and the chain 14 and the driven sprocket 13 are placed on the right side in the vehicle width direction. Cover from the center side (rear wheel 4 side) in the vehicle width direction.

  4 is a view of the upper and lower left cover members 61L and 51L from the inside of the case 40, and FIG. 5 is a view of the upper and lower right cover members 61R and 51R from the inside of the case 40. 6 is a cross-sectional view of the case 40 taken along line VI-VI shown in FIG. 2, and FIG. 7 is a cross-sectional view of the case 40 taken along line VII-VII shown in FIG. 4 and 5, the rear arm 8, the drive sprocket 11, and the driven sprocket 13 are indicated by a two-dot chain line.

  The upper left cover member 61L has a plate-like left plate portion 62L located on the left side of the chain 14 and the driven sprocket 13, and an upper edge portion 63L bent from the edge of the left plate portion 62L to the upper right cover member 61R side. (See FIG. 3 or FIG. 4). The upper right cover member 61R has a right plate portion 62R located on the right side of the chain 14 and the driven sprocket 13, and an upper edge portion 63R bent from the edge of the right plate portion 62R to the upper left cover member 61L side. (See FIG. 3 or FIG. 5). The upper edge portion 63L and the upper edge portion 63R are overlapped with each other and joined by welding. The upper edge portions 63L and 63R have front upper edge portions 63La and 63Ra, respectively. The front upper edge portions 63La and 63Ra extend in the front-rear direction above the chain 14 and cover the chain 14 from above. The upper edge portions 63L and 63R have rear upper edge portions 63Lb and 63Rb, respectively. The rear upper edge portions 63Lb and 63Rb are provided so as to extend rearward and obliquely downward from the front upper edge portions 63La and 63Ra toward the rear end 40a of the case 40, and cover the driven sprocket 13 from obliquely rearward. .

  The lower left cover member 51L includes a plate-like left plate portion 52L located on the left side of the chain 14 and the driven sprocket 13, and a lower edge portion 53L bent from the edge of the left plate portion 52L to the lower right cover member 51R side. (See FIG. 3 or FIG. 4). The lower right cover member 51R includes a plate-like right plate portion 52R located on the right side of the chain 14 and the driven sprocket 13, and a lower edge portion 53R bent from the edge of the right plate portion 52R to the left lower cover member 51L side. (See FIG. 3 or FIG. 5). The lower edge portion 53L and the lower edge portion 53R are overlapped with each other and joined by welding. In the example described here, as shown in FIG. 6, the lower edge portion 53R is located on the lower edge portion 53L and joined to the lower edge portion 53L.

  As shown in FIG. 2 or 4, the rear arm 8 is disposed between the lower left cover member 51 </ b> L and the upper left cover member 61 </ b> L, and the upper case 60 and the lower case 50 are supported by the rear arm 8. Specifically, mounting brackets 8 a and 8 b are provided at the front portion of the rear arm 8 so as to protrude upward and downward inside the case 40. The front portion of the left plate portion 62L of the upper left cover member 61L and the front portion of the left plate portion 52L of the lower left cover member 51L are fixed to the mounting brackets 8a and 8b by fasteners such as bolts and screws. Further, at the rear part of the rear arm 8, there are provided a mounting bracket 8 c that is located inside the case 40 and projects downward, and a mounting bracket 8 d that is located outside the case 40 and projects upward. The rear portion of the left plate portion 52L is fixed to the mounting bracket 8c, and the rear portion of the left plate portion 62L is fixed to the mounting bracket 8d. Thus, the upper case 60 and the lower case 50 are supported by the rear arm 8, and the case 40 can move up and down together with the rear arm 8 when the vehicle is traveling. The lower end of the rear suspension 19 is attached to the attachment bracket 8d (see FIG. 1).

  When the upper case 60 and the lower case 50 are attached to the rear arm 8, the upper edge of the lower case 50 fits inside the lower edge of the upper case 60, thereby forming a box-like case 40 that is long in the front-rear direction. Is done. That is, as shown in FIG. 4, the upper edge 51Lb of the rear part of the lower left cover member 51L is arranged inside the lower edge 61Lb of the rear part of the upper left cover member 61L. Further, as shown in FIG. 5, the upper edge 51Rb of the rear portion of the lower right cover member 51R is disposed inside the lower edge 61Rb of the rear portion of the upper right cover member 61R, and the upper edge 52Ra of the right plate portion 52R is formed of the right plate portion. It is arranged inside the lower edge 62Ra of 62R. As shown in FIG. 2 or 4, the rear arm 8 is disposed between the left plate portion 52L of the lower left cover member 51L and the left plate portion 62L of the upper left cover member 61L.

  As shown in FIG. 4 or 5, the lower edge portions 53L and 53R extend in the front-rear direction below the chain 14 to cover the chain 14 from below, and their rear portions extend rearward and obliquely upward. The driven sprocket 13 is covered obliquely from the rear and rear. That is, the lower edge portions 53L and 53R have front lower edge portions 53La and 53Ra, respectively. The front lower edge portions 53La and 53Ra extend in the front-rear direction below the chain 14 to cover the chain 14 from below. Further, the lower edge portions 53L and 53R have rear lower edge portions 53Lb and 53Rb, respectively. The rear lower edge portions 53Lb and 53Rb are provided so as to extend rearward and obliquely upward from a position below the chain 14 toward the rear end 40a of the case 40, and cover the chain 14 from obliquely rearward and rearward.

  As described above, the motorcycle 1 is provided with the main stand 17a. When the main stand 17a is raised and the rear wheel 4 is away from the ground, the load applied to the rear suspension 19 is eliminated. As a result, the rear end of the rear arm 8 is lowered and the position of the rear portion of the case 40 is lowered as compared with a state where the rear suspension 19 is loaded (the state where the rear suspension 19 is compressed). The front lower edge portions 53La and 53Ra are provided so as to extend forward and obliquely upward from the rear ends of the front lower edge portions 53La and 53Ra at least in a state where the main stand 17a is erected. In particular, in the present embodiment, regardless of whether or not the main stand 17a is raised, that is, even when a load is applied to the rear suspension 19 due to the passenger sitting on the seat 7, the front lower edge 53La , 53Ra are provided to extend forward and obliquely upward.

  Further, as described above, the diameter of the driven sprocket 13 is larger than the diameter of the driving sprocket 11, and the common tangent line X <b> 1 that contacts both the outer periphery of the driving sprocket 11 and the outer periphery of the driven sprocket 13 is inclined. . The front lower edge portions 53La and 53Ra are provided so as to be substantially parallel to the common tangent line X1.

  The front ends 53Ld and 53Rd of the rear lower edge portions 53Lb and 53Rb are located rearward from the rotation center Ce1 of the driven sprocket 13, and the rear lower edge portions 53Lb and 53Rb are rearward and oblique while being gently curved from the front ends 53Ld and 53Rd. It extends upward. Further, the front ends 63Ld and 63Rd of the rear upper edge portions 63Lb and 63Rb described above are also located behind the rotation center Ce1 of the driven sprocket 13, and the rear upper edge portions 63Lb and 63Rb are gently curved from the front ends 63Ld and 63Rd. However, it extends rearward and obliquely downward. The rear ends (lower ends) of the rear upper edges 63Lb and 63Rb and the rear ends (upper ends) of the rear lower edges 53Lb and 53Rb are connected to the rear of the driven sprocket 13.

  As shown in FIG. 5 or FIG. 7, the lower edge portion 53R of the lower right cover member 51R has a bulging portion 53Re in a part thereof. The bulge portion 53Re bulges upward (toward the inside of the case 40) and is spaced upward from the lower edge portion 53L of the lower left cover member 51L. The bulge portion 53Re forms an opening 50a that opens toward the center side (rear wheel 4 side) in the vehicle width direction together with the lower edge portion 53L.

  As shown in FIG. 5, the bulging part 53Re is located between the front lower edge part 53Ra and the rear lower edge part 53Rb. The bulging portion 53Re extends from the rear end of the front lower edge portion 53Ra toward the inside of the case 40, and the rear extending portion 53Rh extends rearward from the rising portion 53Rg and is connected to the rear lower edge portion 53Rb. And have. The rear extending portion 53Rh is separated upward from the lower edge portion 53L (see FIG. 7), and is located at a position higher than the rear ends of the front lower edge portions 53Ra and 53La (a position inside the case 40). In a state where the lower left cover member 51L and the lower right cover member 51R are joined, a rear end of the front lower edge portion 53La of the lower left cover member 51L and a rear lower edge portion 53Lb connected thereto are provided below the rear extending portion 53Rh. The front end 53Ld is located.

  The bulging portion 53Re and the front end 53Ld of the rear lower edge portion 53Lb are located behind the contact point P at which the common tangent line X1 contacts the outer periphery of the driven sprocket 13. Therefore, it is located at the bottom of the case 40 where water or the like tends to accumulate. That is, the common tangent line X1 extends obliquely with respect to the horizontal direction because the driven sprocket 13 has a larger diameter than the driving sprocket 11. Further, the front lower edge portions 53Ra and 53La located in front of the bulging portion 53Re and the front end 53Ld are arranged substantially parallel to the common tangent line X1. Therefore, the position after the contact point P where the bulging portion 53Re and the front end 53Ld are provided is the bottom of the case 40. In particular, in the present embodiment, the rear lower edge portions 53Rb and 53Lb extend obliquely upward from the bulge portion 53Re and the front end 53Ld. Therefore, the positions of the bulging portion 53Re and the front end 53Ld are the lowest positions in the case 40.

  As shown in FIG. 7, the end edge (the edge on the left plate portion 52L side) 53Rf of the bulge portion 53Re is located closer to the left plate portion 52L than the end edge 53Lf of the lower edge portion 53L. Therefore, the bulging portion 53Re and the lower edge portion 53L face each other in the vertical direction. Further, the bulging portion 53Re extends from the lower right cover member 51R toward the lower left cover member 51L and is inclined downward. That is, the rear extending portion 53Rh is provided obliquely, and the gap between the lower edge portion 53L and the rear extending portion 53Rh decreases as the end edge 53Rf is approached.

As shown in FIGS. 4 and 5, a portion of the case 40 located behind the driven sprocket 13 is formed so as to swell rearward. Specifically, the distance R1 between the rear end 40a of the case 40 and the rotation center Ce1 of the driven sprocket 13 is the distance between the front ends 53Ld and 53Rd of the rear lower edge portions 53Lb and 53Rb and the rotation center Ce1 of the driven sprocket 13. It is larger than R2 _L and R2 _R. Therefore, the rear end 40a of the case 40 is located radially outward (backward) from a circle to a distance _R2 L, R2 _R the radius. As a result, when the vehicle accelerates or decelerates, water or the like that moves in the front-rear direction in the case 40 becomes easy to move to the rear part of the case 40 (the part behind the driven sprocket 13) and stays in the bulging part 53Re. This can be suppressed. The rear end 40a is located on a straight line X2 connecting the rotation center Ce2 of the drive sprocket 11 and the rotation center Ce1 of the driven sprocket 13. In the case 40, the distance R1 is larger than the distance between the front ends 63Ld and 63Rd of the rear upper edge portions 63Lb and 63Rb and the rotation center Ce1 of the driven sprocket 13.

  In the motorcycle 1 described above, the lower edge portion 53R has a bulging portion 53Re that bulges upward at a part of the lower edge portion 53R. The bulge portion 53Re is spaced upward from the lower edge portion 53L of the lower left cover member 51L and constitutes an opening 50a together with the lower edge portion 53L. As a result, the efficiency of discharging water or the like that has entered the case 40 can be improved without causing an increase in the amount of bulging downward of the case 40.

  In the motorcycle 1, the bulging portion 53Re and the lower edge portion 53L of the lower left cover member 51L face each other in the vertical direction. Accordingly, it is possible to prevent water or the like from entering the case 40 from below the case 40 through the opening 50a.

  Further, in the motorcycle 1, the bulging portion 53 </ b> Re is located behind a contact P that contacts the outer periphery of the driven sprocket 13 with a common tangent line X <b> 1 contacting both the outer periphery of the driving sprocket 11 and the outer periphery of the driven sprocket 13. . As described above, the bulging part 53Re can be provided at the lowest position in the case 40 by setting the position of the bulging part 53Re behind the contact point P in this way. As a result, the efficiency of discharging water that has entered the case 40 can be improved.

In the motorcycle 1, the lower edge portions 53R and 53L have rear lower edge portions 53Rb and 53Lb that extend rearward and obliquely upward from a position below the chain 14 and cover the chain 14 from the rear. Further, the rear lower edge portions 53Rb and 53Lb extend from the position below the chain 14 toward the rear end 40a of the case 40, and the distance R1 between the rear end 40a of the case 40 and the rotation center Ce1 of the driven sprocket 13 is The distances R2 _R and R2 _L between the front ends 53Rd and 53Ld of the rear lower edge portions 53Rb and 53Lb and the rotation center Ce1 are larger. Thereby, when the vehicle accelerates or decelerates, it is possible to prevent water or the like moving in the front-rear direction in the case 40 from staying in the bulging portion 53Re.

  The motorcycle 1 is provided with a main stand 17a. At least in a state where the vehicle body is supported by the main stand 17a, the lower edge portions 53R and 53L extend forward and obliquely upward from the position of the bulging portion 53Re. Thereby, when the vehicle is stopped, water or the like that has entered the case 40 can be efficiently discharged. As described above, in the motorcycle 1, regardless of whether the vehicle body is supported by the main stand 17a, the front lower edge portions 53Ra and 53La are provided to extend forward and obliquely upward from the rear end. It has been.

  In the motorcycle 1, the bulge portion 53Re extends from the lower right cover member 51R where the bulge portion 53Re is formed toward the lower left cover member 51L and is inclined downward. As a result, water or the like on the bulging portion 53Re (in the above description, water on the rear extending portion 53Rh) can be smoothly discharged from the opening 50a.

  The present invention is not limited to the motorcycle 1 described above, and various modifications can be made. For example, in the above description, the bulging portion 53Re is provided on the lower edge portion 53R of the lower right cover member 51R. However, the bulge portion may be provided on the lower edge portion 53L of the lower left cover member 51L.

  In the above description, the opening 50a is provided so as to open toward the center side in the vehicle width direction. However, the lower right cover member 51R may be formed so that the opening 50a opens downward. FIG. 8 is a cross-sectional view of a case included in the motorcycle according to this embodiment. In the figure, the same reference numerals are assigned to the same portions as those described above. The right plate portion 520R of the lower right cover member 510R shown in the figure is provided with a wall portion 520Ra extending further downward beyond the bulging portion 53Re. The lower end of the wall portion 520Ra reaches the height of the lower edge portion 53L, and the opening 500a constituted by the bulging portion 53Re and the lower edge portion 53L opens downward.

1 Motorcycle, 3 Front Wheel, 4 Rear Wheel, 4a Axle, 5 Handle, 6 Front Fork, 7 Seat, 8 Rear Arm, 9 Pivot Shaft, 10 Engine, 11 Drive Sprocket (Drive Rotating Member), 12 Transmission Mechanism, 13 Driven Sprocket (driven rotating member), 14 chain (annular transmission member), 17a main stand, 17b side stand, 19 rear suspension, 30 frame, 40 case, 40a rear end of case, 50 lower case, 50a, 500a opening, 51L lower left Cover member, 51R, 510R Right lower cover member, 52L Left plate part, 52R, 520R Right plate part, 53L, 53R Lower edge part, 53La, 53Ra Front lower edge part, 53Lb, 53Rb Rear lower edge part, 53Re bulge part, 53Rg rising part, 53Rh rear extension part, 60 upper case, 61L upper left Cover member, 61R upper right cover member, 62L left plate part, 62R right plate part, 63L, 63R upper edge part, 63La, 63Ra front upper edge part, 63Lb, 63Lb rear upper edge part, 520Ra wall part, R1 of driven sprocket Distance from the center of rotation to the rear end of the case, distance from the center of rotation of the R2 _R , R2 _L driven sprocket to the front end of the rear lower edge, X1 common tangent.

Claims (7)

A drive rotating member that outputs engine power;
A driven rotary member that is disposed rearward from the drive rotary member and interlocks with the rear wheel;
An annular transmission member wound around the drive rotation member and the driven rotation member, and transmitting the rotation of the drive rotation member to the driven rotation member;
A case that covers the annular transmission member and the driven rotating member;
The case has left and right cover members that cover the annular transmission member from the right side and the left side in the vehicle width direction,
The left and right cover members have left and right lower edges that are joined together to cover the annular transmission member from below, and each lower edge includes a front lower edge that extends in the front-rear direction below the annular transmission member A rear lower edge extending rearward and obliquely upward toward the rear end of the case,
One lower edge of the left and right lower edges has a bulge that bulges upward and separates upward from the other lower edge and forms an opening with the other lower edge,
The bulge portion is located between the front lower edge portion and the rear lower edge portion of the one lower edge portion, and the rear lower edge portion of the one lower edge portion is rearward and oblique from the bulge portion. Extending upwards,
Motorcycle characterized by that. The motorcycle according to claim 1,
The bulge part and the other lower edge part face each other in the vertical direction.
Motorcycle characterized by that. The motorcycle according to claim 1,
A tangent line that contacts both the outer periphery of the driven rotating member and the outer periphery of the driven rotating member is positioned behind the contact point that contacts the outer periphery of the driven rotating member.
Motorcycle characterized by that. The motorcycle according to claim 1,
The rear lower edge extends from the position below the annular transmission member toward the rear end of the case,
The distance between the rear end of the case and the rotation center of the driven rotary member is larger than the distance between the front end of the rear lower edge and the rotation center of the driven rotary member,
Motorcycle characterized by that. The motorcycle according to claim 1,
A stand for supporting the vehicle body when the vehicle is stopped;
At least in a state where the vehicle body is supported by the stand, the left and right front lower edge portions extend forward and obliquely upward from the bulge portion.
Motorcycle characterized by that. The motorcycle according to claim 1,
The bulge portion extends from the cover member having the one lower edge portion where the bulge portion is formed toward the cover member having the other lower edge portion, and is inclined downward.
Motorcycle characterized by that. The motorcycle according to claim 1,
The opening formed by the bulge and the other lower edge is open toward the center in the vehicle width direction.
Motorcycle characterized by that.

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