JP2019034604A - Vehicle body frame of saddle-riding type vehicle - Google Patents

Abstract

To enable a power unit and a vehicle body frame to be securely coupled to improve rigidity of a vehicle body frame in a structure where fastening members are fastened in a fore and aft direction to connect the power unit to the vehicle body frame.SOLUTION: A vehicle body frame 11 includes a body frame 21 disposed behind a power unit and the body frame 21 has a left frame part 22, a right frame part 23, and an upper connection part 26 and a lower connection part 27. The vehicle body frame 11 includes a rear upper mount part 41 and a rear lower mount part 42 which support a rear part of the power unit by fastening fastening members in a fore and aft direction. The rear upper mount part 41 protrudes downward from a mount support surface 26A provided on a lower surface of the upper connection part 26 and the rear lower mount part 42 protrudes upward from a mount support surface 27A provided an upper surface of the lower connection part 27. These mount parts 41, 42 have shapes that gradually spread in the fore and aft direction from the tip side to the base end side.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a body frame of a saddle riding type vehicle.

  A body frame of a straddle-type vehicle such as a motorcycle has a function of forming a skeleton of the straddle-type vehicle and supporting a power unit including an engine and a transmission. A body frame of a saddle-ride type vehicle generally includes a head pipe, a pair of main frames, and a pair of down tubes.

  The head pipe is provided on the front upper side of the power unit. The pair of main frames extend rearward from the head pipe on the upper left side and upper right side of the power unit, then bend, and extend downward on the left rear side and right rear side of the power unit, respectively. Here, in each main frame, the part extending the upper left side or upper right side of the power unit rearward is called the “front frame part”, and the part extending the lower left side or the right rear side of the power unit downward. It is called “rear frame part”. Pivot support portions for connecting the front end portions of the swing arms are respectively provided on the rear frame portions of the pair of main frames. Further, the pair of down tubes extend downward from the head pipe on the left front side and the right front side of the power unit.

  Further, the body frame of the saddle riding type vehicle has a plurality of engine mounts for supporting the power unit. For example, a front engine mount for supporting the left front portion and the right front portion of the power unit is provided at the lower ends of the pair of down tubes. Further, rear engine mounts for supporting the upper left portion and the upper right portion of the rear portion of the power unit are provided at portions above the pivot support portion in the rear frame portions of the pair of main frames. Further, lower engine mounts for supporting the lower left portion and the lower right portion of the rear portion of the power unit are provided in the lower frame portions of the rear frame portions of the pair of main frames, respectively.

  Each engine mount and the power unit are connected by inserting and tightening a mount bolt from the left or right side of the power unit into a hole formed in each engine mount and power unit. As an example, each rear engine mount is formed with a through-hole penetrating in the left-right direction. Also, bolt holes are formed in the left and right surfaces at the upper rear of the power unit. The left rear engine mount is located on the left of the rear upper part of the power unit, and the shaft part of the mount bolt passes through the through hole from the left of the rear engine mount, and the bolt hole formed on the left side of the rear upper part of the power unit It is connected to the rear upper part of the power unit by fastening to. The right rear engine mount is arranged on the right upper side of the rear of the power unit, and the shaft portion of the mount bolt is passed through the through hole from the right side of the rear engine mount to be formed on the right side of the upper upper portion of the power unit. It is connected to the rear upper part of the power unit by fastening in the bolt hole. Depending on the body frame, a through-hole penetrating in the left-right direction is formed in the rear upper part of the power unit. One through-hole in the left rear engine mount, through-hole in the power unit, and through-hole in the right rear engine mount. Some have a configuration in which the left and right rear engine mounts are respectively connected to the rear upper portion of the power unit by passing the shaft portion of the long mount bolt and fastening the nut to the mount bolt. Each lower engine mount and each front engine mount are connected to the power unit in the same manner as each rear engine mount.

  As described above, the general body frame of the saddle riding type vehicle has a structure in which the power unit and each engine mount are connected by fastening the mounting bolts in the left-right direction. On the other hand, the engine support structure described in Patent Document 1 below has a structure in which the engine case and a mount portion provided on the main frame are connected by fastening bolts to the engine case from behind. Have. In other words, in the engine support structure described in Patent Document 1, the direction in which the engine case and the mount portion are fastened by the bolt, that is, the direction in which the bolt tightening force acts between the engine case and the mount portion, is insignificant. This is the front-rear direction of the riding vehicle.

  The body frame is required to increase rigidity with respect to a load in the front-rear direction that acts when the saddle riding type vehicle is accelerated or decelerated. In the engine support structure described in Patent Document 1, the direction in which the engine case and the mount portion are fastened by the bolts is the front-rear direction. Therefore, the vehicle body with respect to the load in the front-rear direction compared to the general body frame described above. It is considered that the rigidity of the frame can be increased.

JP2015-96364A

  By the way, the engine support structure described in Patent Document 1 welds a plate-like member extending in the left-right direction to a second main frame portion extending in the up-down direction behind the engine, and penetrates the plate-like member in the front-rear direction. A bolt is inserted into the through-hole from behind and the bolt is tightened into the screw hole of the engine case.

  In this structure, in order to increase the rigidity of the vehicle body frame, the engine case is caused to function as a reinforcement member for the vehicle body frame by firmly coupling the second main frame portion and the engine case via a plate-like member and a bolt. It is desirable.

  However, in this structure, when the plate-like member is thin, the rigidity of the plate-like member itself is lowered, and thus the plate-like member has sufficient rigidity to resist the longitudinal load acting on the saddle riding type vehicle. It becomes difficult to make it. As a result, it is difficult to firmly connect the second main frame portion and the engine case with the plate-like member and the bolt, and it is difficult to increase the rigidity of the vehicle body frame.

  On the other hand, if the thickness of the plate member is increased in order to increase the rigidity of the plate member itself, the through hole formed in the plate member becomes longer, the bolt inserted through the through hole becomes longer, and the rigidity of the bolt decreases. When the rigidity of the bolt is lowered, it becomes difficult to give the bolt enough rigidity to resist the vertical load acting on the body frame via the rear cushion unit or the swing arm. As a result, it is difficult to firmly connect the second main frame portion and the engine case with the plate-like member and the bolt, and it is difficult to increase the rigidity of the vehicle body frame.

  The present invention has been made in view of the above-described problems, for example, and an object of the present invention is to have a structure in which a power unit and a vehicle body frame are connected to each other by fastening fastening members such as mount bolts in the front-rear direction. An object of the present invention is to provide a body frame of a straddle-type vehicle, in which a power unit and a body frame can be firmly coupled to each other, and the rigidity of the body frame can be increased.

  In order to solve the above problems, a vehicle body frame of a saddle-ride type vehicle according to the present invention includes a head pipe provided at an upper front side of a power unit, a tank rail extending rearward from the head pipe to the upper side of the power unit, A left frame part extending downward from the rear end of the tank rail to the left rear side of the power unit; a right frame part extending downward from the rear end of the tank rail to the right rear side of the power unit; and the left frame part; A body frame having an upper connecting portion connecting the upper portions of the right frame portion and a lower connecting portion connecting lower portions of the left frame portion and the right frame portion; and a front end of the tank rail A front mount that is connected to the side or the head pipe directly or via a connecting member and supports the front part of the power unit And a rear mount portion that supports the rear portion of the power unit, and a lower surface of the upper connection portion or an upper surface of the lower connection portion is provided with a mount support surface that extends in the front-rear and left-right directions, and the rear mount portion is A contact surface that protrudes in the vertical direction from the mount support surface and gradually widens in the front-rear direction from the front end side to the base end side, and is in contact with the mounting surface facing rearward in the power unit on the front surface of the rear mount portion And a through hole for inserting a shaft portion of a fastening member for fastening the rear mount portion to the mounting surface of the power unit passes through the rear mount portion in the front-rear direction. It is characterized by being provided.

  According to the present invention, in a vehicle body frame of a saddle riding type vehicle having a structure in which the power unit and the vehicle body frame are connected to each other by fastening the fastening members in the front-rear direction, the power unit and the vehicle body frame are firmly coupled to each other. And the rigidity of the body frame can be increased.

1 shows a straddle-type vehicle provided with a body frame according to an embodiment of the present invention. It is the external view which looked at the vehicle body frame of the Example of this invention from the left. It is the external view which looked at the body frame of the example of the present invention from the upper part. It is the external view which looked at the vehicle body frame (except a seat frame etc.) of the example of the present invention from the front lower left side. It is the external view which looked at the vehicle body frame (except a seat frame etc.) of the example of the present invention from back. It is an exploded view of the body frame in the vehicle body frame of the Example of this invention. It is sectional drawing of the body frame seen from the arrow VII-VII direction in FIG. In the vehicle body frame of the Example of this invention, it is explanatory drawing which shows the connection structure of the rear part of a power unit, and a body frame.

  A vehicle body frame according to an embodiment of the present invention includes a head pipe, a tank rail, a body frame, a front mount portion, and a rear mount portion.

  The head pipe is provided on the front upper side of the power unit. The tank rail extends from the head pipe to the rear of the upper side of the power unit.

  The body frame has a left frame portion, a right frame portion, an upper connecting portion, and a lower connecting portion. The left frame portion extends downward from the rear end portion of the tank rail to the left rear side of the power unit. The right frame portion extends downward from the rear end portion of the tank rail to the right rear side of the power unit. The upper connecting portion connects the upper portions of the left frame portion and the right frame portion. The lower connecting portion connects the lower portions of the left frame portion and the right frame portion.

  The front mount part supports the front part of the power unit. The front mount portion is connected to the front end side of the tank rail or the head pipe directly or via a connecting member. The connecting member is, for example, a down frame or a down tube, and may be a bracket.

  The rear mount part supports the rear part of the power unit. A mount support surface extending in the front-rear and left-right directions is provided on the lower surface of the upper connection portion or the upper surface of the lower connection portion, and the rear mount portion protrudes in the vertical direction from the mount support surface. The rear mount portion has a shape that gradually widens in the front-rear direction from the distal end side toward the proximal end side. Further, a contact surface is provided on the front surface of the rear mount portion so as to come into contact with the mounting surface facing rearward in the power unit. Further, a through hole for inserting a shaft portion of a fastening member for fastening the rear mount portion on the mounting surface of the power unit is provided on the front end side of the rear mount portion so as to penetrate the rear mount portion in the front-rear direction. ing.

  The connection between the rear portion of the power unit and the body frame is made by bringing the contact surface of the rear mount portion into contact with the mounting surface facing rearward in the power unit, and in that state, the fastening member (from the rear of the rear mount portion to the through hole of the rear mount portion) For example, the shaft portion of a mounting bolt is inserted, and the shaft portion of the fastening member is fastened to, for example, a fastening hole (for example, a bolt hole) formed on the mounting surface of the power unit.

  According to the vehicle body frame of the embodiment of the present invention, the rear mount portion has a shape that protrudes in the vertical direction from the mount support surface and gradually expands in the front-rear direction from the distal end side toward the proximal end side. It is possible to increase the area of the joint portion between the body frame and the body frame, and in particular, it is possible to increase the length of the joint portion in the front-rear direction. Thereby, the rigidity of the rear mount part with respect to the load which acts on the front-back direction can be improved. Therefore, the body frame and the power unit can be firmly coupled in the front-rear direction via the highly rigid rear mount, and the load in the front-rear direction acting on the saddle type vehicle is distributed and absorbed by the body frame and the power unit. can do.

  In addition, a through hole for inserting a shaft portion of a fastening member for fastening the power unit and the rear mount portion is provided on the front end side of the rear mount portion so as to penetrate the rear mount portion in the front-rear direction. The rear mount portion has a shape that gradually widens in the front-rear direction from the distal end side toward the proximal end side.In other words, the rear mount portion gradually constricts in the front-rear direction from the proximal end side toward the distal end side. It has a round shape. Thus, the through-hole provided in the front end side of the rear mount part can be shortened by making the rear mount part gradually narrow in the front-rear direction from the base end side toward the front end side. Thereby, a power unit and a back mount part can be fastened using a fastening member with a small length dimension. By reducing the length dimension of the fastening member, the rigidity of the fastening member with respect to a load acting in the vertical direction can be increased. Therefore, the power unit and the rear mount portion can be firmly coupled by the highly rigid fastening member. Thereby, the load which acts on the body frame in the vertical direction via the rear cushion unit or the swing arm can be reliably transmitted to the power unit via the rear mount portion. Accordingly, the load can be received by both the body frame and the power unit, and the load can be dispersed and absorbed by the body frame and the power unit.

  As described above, according to the vehicle body frame according to the embodiment of the present invention, the rigidity of the rear mount portion and the rigidity of the fastening member can be increased, thereby enhancing the coupling between the body frame and the power unit. Therefore, the power unit can function as a reinforcing member for the body frame, and the rigidity of the body frame can be increased.

(Saddle-ride type vehicle)
FIG. 1 shows a saddle riding type vehicle 1 provided with a body frame 11 according to an embodiment of the present invention as viewed from the left. In the following embodiments, the driver of the saddle riding type vehicle 1 is used as a reference when describing the direction of the arrangement and shape of components and members. The front (F), rear (B), left (L), right (R), upper (U), and lower (D) points to the driver of the straddle-type vehicle 1 indicated by the arrows drawn in the lower right of each figure. The reference direction is shown.

  In FIG. 1, a straddle-type vehicle 1 is, for example, a motorcycle. The saddle riding type vehicle 1 includes a vehicle body frame 11 that forms a skeleton thereof. A steering shaft 61 is supported on the front portion of the vehicle body frame 11, a front fork 62 is supported on the steering shaft 61 via a bracket, and a front wheel 63 is supported on the front fork 62.

  A power unit 64 including an engine, a transmission, and the like is supported at a substantially middle portion of the body frame 11 in the front-rear direction. The power unit 64 includes a crankcase 65, a cylinder 66 and a cylinder head 67. A transmission case 68 is formed integrally with the rear portion of the crankcase 65. A transmission is provided in the transmission case 68, and a drive sprocket 69 is provided on the left side of the transmission case 68. A muffler 75 is provided below the power unit 64. The exhaust port provided at the front portion of the cylinder head 67 and the muffler 75 are connected by an exhaust pipe 76.

  Further, a front end portion of the swing arm 77 is supported on the lower rear side of the body frame 11, and a rear wheel 78 is supported on the rear end side of the swing arm 77. A rear cushion unit 79 is provided between the swing arm 77 and the vehicle body frame 11. A driven sprocket 81 is provided on the rear wheel 78, and a drive chain 82 is bridged between the drive sprocket 69 and the driven sprocket 81. The drive chain 82 is disposed on the left side of the saddle riding type vehicle 1.

  A fuel tank 83 is provided on the upper side of the vehicle body frame 11, and an operation seat 84 is provided behind the fuel tank 83. A pair of left and right steps 85 on which the driver puts his / her foot is provided below the driving seat 84, and each step 85 is attached to the vehicle body frame 11 via a stay 86 and a stay attaching member 87.

(Body frame)
2 is a view of the vehicle body frame 11 as viewed from the left, and FIG. 3 is a view of the vehicle body frame 11 as viewed from above. 4 is a view of the vehicle body frame 11 as viewed from the front lower left side, and FIG. 5 is a view of the vehicle body frame 11 as viewed from the rear. 4 and 5, illustration of the seat frame 51 and the like is omitted. 6 is an exploded view of the body frame 21, and FIG. 7 is a cross-sectional view of the body frame 21 as seen from the direction of arrows VII-VII in FIG.

  As shown in FIGS. 2 and 3, the vehicle body frame 11 includes a head pipe 12, a pair of upper tank rails 13, a pair of lower tank rails 14, a pair of down frames 15, a plurality of reinforcing members 16, and a plurality of reinforcing frames 17. A body frame 21, a plurality of seat frames 51, a bridge frame 52, and a plurality of reinforcing seat frames 53. Further, as shown in FIG. 4, the vehicle body frame 11 includes a pair of rear upper mount portions 41, a pair of rear lower mount portions 42, and a pair of front mount portions 46 for supporting the power unit 64.

  The head pipe 12 is a cylindrical member formed of, for example, a metal such as steel, and is disposed at the front upper portion of the saddle riding type vehicle 1, that is, the front upper portion of the power unit 64, as shown in FIG. A steering shaft 61 is rotatably supported in the head pipe 12.

  Each upper tank rail 13, each lower tank rail 14, each down frame 15 and each reinforcement frame 17 are pipes formed of metal such as steel. The pair of upper tank rails 13 have their front end portions connected to the upper portion of the head pipe 12, respectively, and rear end portions extending rearward while inclining the upper left and upper right sides of the power unit 64 downward. Further, as shown in FIG. 3, the pair of upper tank rails 13 have their front end portions close to each other, but greatly expand in the left-right direction as they extend rearward. Thereafter, as can be seen by comparing FIG. 1 and FIG. 3, the pair of upper tank rails 13 gradually become closer to each other as they extend backward in the plan view, beyond the cylinder head 67 of the power unit 64. You are approaching.

  The pair of lower tank rails 14 is disposed below the pair of upper tank rails 13. The pair of lower tank rails 14 have their front end portions connected to the lower portion of the head pipe 12 and their rear end portions extending rearward while inclining the upper left and upper right sides of the power unit 64 downward. Further, as shown in FIG. 3, the pair of lower tank rails 14 follow the same locus as the pair of upper tank rails 13 and extend rearward, but pass outside the pair of upper tank rails 13. ing.

  As shown in FIG. 4, the pair of down frames 15 have their upper ends connected to the front end sides of the pair of lower tank rails 14, respectively, and the lower ends extend slightly downward while being inclined slightly rearward. In addition, a front mount portion 46 for supporting the front portion of the power unit 64 is provided at the lower end portion of each down frame 15.

  As shown in FIG. 5, a reinforcing member 16 that reinforces the mutual connection between the upper tank rails 13 and the head pipe 12 is provided on the front end side of the pair of upper tank rails 13. A reinforcing member 16 that reinforces the mutual connection between the lower tank rails 14 and the head pipe 12 is also provided on the front end side of the pair of lower tank rails 14. As shown in FIG. 2, two reinforcing frames 17 are provided between the upper tank rail 13 and the lower tank rail 14 on the left side of the vehicle body frame 11. A reinforcing frame 17 is also provided between a portion of the lower tank rail 14 behind the portion where the upper end of the down frame 15 is connected and the lower end of the down frame 15. Similarly, a plurality of reinforcing frames 17 are provided on the right side of the body frame 11.

  Further, as shown in FIG. 1, the plurality of seat frames 51 are disposed on the rear upper side of the saddle riding type vehicle 1. Specifically, the front end portion of each seat frame 51 is connected to the upper surface of the body frame 21 as shown in FIG. Further, the rear end side of each seat frame 51 extends rearward while inclining upward. A bridge frame 52 is connected to the rear end of each seat frame 51. A reinforcing seat frame 53 is connected between the seat frames 51. Each seat frame 51, bridge frame 52, and each reinforcing seat frame 53 are pipes formed of metal such as steel.

(Body frame)
The body frame 21 has a function of supporting the rear end of each upper tank rail 13 and the rear end of each lower tank rail 14, a function of supporting the rear of the power unit 64, and a function of supporting the front end of the swing arm 77, The frame has both a function of supporting the rear cushion unit 79 and a function of supporting each seat frame 51. As shown in FIG. 1, the body frame 21 is disposed behind the power unit 64.

  As shown in FIG. 5, the body frame 21 has a left frame part 22, a right frame part 23, an upper connecting part 26, and a lower connecting part 27. The left frame portion 22 extends downward on the left rear side of the power unit 64 from the rear end portions of the left upper tank rail 13 and the left lower tank rail 14. The right frame portion 23 extends downward on the right rear side of the power unit 64 from the rear ends of the upper tank rail 13 on the right side and the lower tank rail 14 on the right side. The upper connecting portion 26 connects the upper portions of the left frame portion 22 and the right frame portion 23. The lower connecting portion 27 connects the lower portions of the left frame portion 22 and the right frame portion 23.

  As shown in FIG. 6, the left frame portion 22 is formed by joining an inner plate portion 24 and an outer plate portion 25 to each other. That is, the inner side plate part 24 and the outer side plate part 25 are each formed by pressing a metal plate. The front edge and the rear edge of the inner plate part 24 are each bent so as to protrude to the left. Further, the front edge and the rear edge of the outer plate portion 25 are bent so as to protrude rightward. The left frame portion 22 aligns the front and rear edge portions of the inner plate portion 24 with the front and rear edge portions of the outer plate portion 25 so that the front edge portion and the outer plate portion of the inner plate portion 24 are aligned. 25 by welding the front edge of 25 and welding the rear edge of the inner plate portion 24 and the rear edge of the outer plate portion 25. The right frame portion 23 has a symmetrical structure with the left frame portion 22, and is formed by joining the inner plate portion 24 and the outer plate portion 25 to each other in the same manner as the left frame portion 22. The upper end portions of the left frame portion 22 and the right frame portion 23 are joined to the left portion and the right portion of the upper connecting portion 26 by, for example, welding. The lower end portions of the left frame portion 22 and the right frame portion 23 are joined to the left portion and the right portion of the lower connecting portion 27 by welding, for example.

  Moreover, the upper connection part 26 and the lower connection part 27 are each formed, for example with metals, such as iron or aluminum, and these are shape | molded, for example by casting.

  As shown in FIG. 6, since the tank rail connection part 19, the rear cushion connection part 31, the seat frame connection part 33, the rear upper mount part 41, etc., which will be described later, are integrally formed in the upper connection part 26, the upper connection part Although the portion 26 has a complicated appearance, the upper connecting portion 26 can be basically grasped as a substantially rectangular parallelepiped block. A mount support surface 26 </ b> A for supporting the two rear upper mount portions 41 is provided on the lower surface of the upper connecting portion 26. The mount support surface 26 </ b> A is formed over the entire lower surface of the upper connecting portion 26. The mount support surface 26A is a flat surface extending in the front-rear and left-right directions, and as shown in FIG. 7, is inclined upward so that the rear end portion is higher than the front end portion.

  Further, as shown in FIG. 6, since the lower connecting portion 27 is integrally formed with a link member connecting portion 32 and a rear lower mount portion 42, which will be described later, the lower connecting portion 27 has a complicated appearance. However, the lower connecting portion 27 can be basically grasped as a substantially rectangular parallelepiped block. On the upper surface of the lower connecting portion 27, a mount support surface 27A for supporting the two rear lower mount portions 42 is provided. The mount support surface 27A is formed over most of the upper surface of the lower connecting portion 27 (a portion excluding its left end and right end). The mount support surface 27A is a flat surface extending in the front-rear and left-right directions, and as shown in FIG. 7, is inclined downward so that the rear end portion is lower than the front end portion.

  Further, as shown in FIG. 5, the body frame 21 has a body frame space 28 surrounded by surfaces facing the inside of the left frame portion 22, the right frame portion 23, the upper connecting portion 26 and the lower connecting portion 27. Have. That is, in the present embodiment, the body frame space 28 includes the right surface 22A of the left frame portion 22, the left surface 23A of the right frame portion 23, the lower surface of the upper connecting portion 26 (mount support surface 26A), and the upper surface of the lower connecting portion 27 ( A space surrounded by the mount support surface 27A). When viewed from the front or the rear, the body frame 21 is formed in a substantially square shape.

  As shown in FIG. 2, two tank rail connecting portions 29 are provided on the front upper left side of the body frame 21. Among these tank rail connecting portions 29, the rear end portion of the left upper tank rail 13 is connected to the upper tank rail connecting portion 29, and the rear side of the left lower tank rail 14 is connected to the lower tank rail connecting portion 29. The ends are connected. As shown in FIG. 3, two tank rail connecting portions 29 are also provided on the front side of the upper right portion of the body frame 21. Among these tank rail connecting portions 29, the upper tank rail connecting portion 29 is connected to the rear end portion of the right upper tank rail 13, and the lower tank rail connecting portion 29 is connected to the rear of the right lower tank rail 14. The ends are connected. Further, as shown in FIG. 5, the two left tank rail connection portions 29 are formed in a portion where the outer plate portion 25 and the upper connection portion 26 of the left frame portion 22 are combined. The rear end portions of the left upper tank rail 13 and the lower tank rail 14 are welded to the upper connecting portion 26 and the outer plate portion 25, respectively. Similarly, the two right tank rail connection portions 29 are formed in a portion where the outer plate portion 25 and the upper connection portion 26 of the right frame portion 23 are combined, and the upper tank rail 13 and the lower tank rail 14 on the right side are formed. Each of the rear end portions of each of these is welded to the upper connecting portion 26 and the outer plate portion 25.

  Further, in the body frame 21, pivot support portions 30 are provided at the substantially intermediate portion in the vertical direction of the left frame portion 22 and the substantially intermediate portion in the vertical direction of the right frame portion 23, respectively. Between the pivot support portions 30, the front end portion of the swing arm 77 is rotatably supported.

  Further, as shown in FIG. 5, a rear cushion connection portion 31 is provided on the upper rear side of the body frame 21 and in the middle portion in the left-right direction. The rear cushion connecting portion 31 is integrally formed with the upper connecting portion 26. Further, a link member connecting portion 32 is provided on the lower rear side of the body frame 21 and in the middle portion in the left-right direction. The link member connecting portion 32 is integrally formed with the lower connecting portion 27. As shown in FIG. 1, the upper end portion of the rear cushion unit 79 is connected to the rear cushion connection portion 31. Further, a part of the link member 80 that connects the lower end portion of the rear cushion unit 79 and the swing arm 77 is connected to the link member connecting portion 32.

  Further, as shown in FIG. 5, three seat frame connections for connecting the front end portions of the plurality of seat frames 51 to the body frame 21 are provided on the upper surface of the body frame 21, specifically, the upper surface of the upper connecting portion 26. A portion 33 is provided. Further, each seat frame connecting portion 33 is formed with a bolt hole in which a screw is formed on the inner peripheral surface. The front end portion of the seat frame 51 is connected to each seat frame connecting portion 33 using a bolt.

  Further, stay fixing members 34 are respectively fixed to the upper and lower portions of the rear surface of the left frame portion 22. As shown in FIG. 1, a stay attaching member 87 for supporting the step 85 and the stay 86 on the left side of the saddle riding type vehicle 1 is attached to these stay fixing members 34. Similarly, stay fixing members 34 are also fixed to the upper and lower portions of the rear surface of the right frame portion 23, respectively. A stay mounting member 87 for supporting the step 85 and the stay 86 on the right side of the saddle riding type vehicle 1 is attached to these stay fixing members 34.

(Rear upper mount part / Rear lower mount part)
As shown in FIG. 4, the body frame 21 includes a pair of rear upper mount portions 41 for supporting the rear upper side of the power unit 64 and a pair of rear lower mount portions 42 for supporting the lower rear side of the power unit 64. Is provided.

  Each rear upper mount portion 41 is provided on a mount support surface 26 </ b> A provided on the lower surface of the upper coupling portion 26 in the body frame 21. One of the pair of rear upper mount portions 41 protrudes downward from the left side of the mount support surface 26A. The other of the pair of rear upper mount portions 41 protrudes downward from the right side of the mount support surface 26A. These rear upper mount portions 41 are separated from each other in the left-right direction. These rear upper mount portions 41 are integrally formed with the upper connecting portion 26 by casting.

  The front surface of each rear upper mount portion 41 is provided with a contact surface 41A that comes into contact with the mounting surface 70A (see FIG. 8) facing rearward in the power unit 64. As shown in FIG. 7, the contact surface 41A is a flat surface and extends downward in a substantially vertical direction from the front end portion of the mount support surface 26A. An inclined surface 41 </ b> B is provided on the rear surface of each rear upper mount portion 41. The inclined surface 41B extends upward while inclining backward from the front end portion of the rear upper mount portion 41 and intersects with the mount support surface 26A. When the saddle riding type vehicle 1 is viewed from the side, the inclined surface 41B extends in a straight line shape or an upwardly convex arc shape. Each rear upper mount portion 41 has such an inclined surface 41B, and thus has a shape that gradually widens in the front-rear direction from the distal end side toward the proximal end side. Further, each rear upper mount portion 41 is formed in a substantially triangular shape surrounded by the mount support surface 26A, the contact surface 41A, and the inclined surface 41B when the saddle riding type vehicle 1 is viewed from the side. Further, as shown in FIG. 5, Rs are respectively formed on the left and right portions on the base end side of each rear upper mount portion 41. In other words, the base end side of each rear upper mount portion 41 gradually increases in size in the left-right direction as it approaches the mount support surface 26A, and expands in the left-right direction so that the left surface and the right surface draw an arc.

  Further, as shown in FIG. 7, an insertion hole 41 </ b> C and a through hole 41 </ b> D are provided on the tip side of each rear upper mount portion 41. The through hole 41D is a hole through which the shaft portion 45A of the mount bolt 45 is inserted. The insertion hole 41C is a hole for inserting the head 45B of the mount bolt 45 (see FIG. 8). The insertion hole 41C opens to the rear surface of the rear upper mount portion 41, and the through hole 41D penetrates the rear upper mount portion 41 in the front-rear direction. The insertion hole 41C and the through hole 41D are arranged coaxially with each other, and the insertion hole 41C has a larger diameter than the through hole 41D.

  Each rear lower mount portion 42 is provided on a mount support surface 27 </ b> A provided on the upper surface of the lower connection portion 27 in the body frame 21. One of the pair of rear lower mount portions 42 protrudes upward from the left side of the mount support surface 27A. The other of the pair of rear lower mount portions 42 protrudes upward from the right side of the mount support surface 27A. These rear lower mount portions 42 are separated from each other in the left-right direction. The rear lower mount portion 42 is integrally formed with the lower connecting portion 27 by casting.

  On the front surface of each rear lower mount portion 42, a contact surface 42 </ b> A that contacts the mounting surface 70 </ b> A (see FIG. 8) facing rearward in the power unit 64 is provided. As shown in FIG. 7, the contact surface 42A is a flat surface and extends upward in a substantially vertical direction from the front end portion of the mount support surface 27A. An inclined surface 42 </ b> B is provided on the rear surface of each rear lower mount portion 42. The inclined surface 42B extends downward while inclining backward from the tip of the rear lower mount portion 42 and intersects with the mount support surface 27A. The inclined surface 42 </ b> B extends in a straight line shape or an arc shape protruding downward and forward when the saddle riding type vehicle 1 is viewed from the side. Each rear lower mount portion 42 has such an inclined surface 42B, and thus has a shape that gradually widens in the front-rear direction from the distal end side toward the proximal end side. Each rear lower mount portion 41 is formed in a substantially triangular shape surrounded by the mount support surface 27A, the contact surface 42A, and the inclined surface 42B when the saddle riding type vehicle 1 is viewed from the side. Further, as shown in FIG. 5, R is formed on the left side and the right side on the base end side of each rear lower mount part 42, similarly to the rear upper mount part 41.

  Further, as shown in FIG. 7, an insertion hole 42 </ b> C for inserting a head 45 </ b> B of the mount bolt 45, and the mount bolt 45, similar to the rear upper mount portion 41, on the front end side of each rear lower mount portion 42. A through hole 42D for inserting the shaft portion 45A is provided. The insertion hole 42C opens to the rear surface of the rear lower mount portion 42, and the through hole 42D penetrates the rear lower mount portion 42 in the front-rear direction.

  In this embodiment, the left rear upper mount 41 and the left rear lower mount 42 face each other in the vertical direction, and the right rear upper mount 41 and the right rear lower mount 42 Are opposed to each other in the vertical direction. Also, the left rear upper mount portion 41 and the left rear lower mount portion 42 are separated from each other in the vertical direction. Further, the right rear upper mount portion 41 and the right rear lower mount portion 42 are separated from each other in the vertical direction.

  As shown in FIG. 5, a chain arrangement space 28 </ b> A for passing the drive chain 82 is formed in a region from the lower surface of the upper connecting portion 26 to the upper surface of the lower connecting portion 27 on the left end side in the body frame space 28. Has been. The pair of rear upper mount portions 41 and the pair of rear lower mount portions 42 are respectively arranged on the right side of the chain arrangement space 28A.

  Further, as shown in FIG. 7, the pair of rear upper mount portions 41 and the pair of rear lower mount portions 42 are formed such that the contact surfaces 41A and 42A are on the same plane. A two-dot chain line P in FIG. 7 indicates a surface including the respective contact surfaces 41A and 42A.

  Here, FIG. 8 shows a connection structure between the rear part of the power unit 64 and each rear upper mount part 41 and each rear lower mount part 42. As shown in FIG. 8, four attachment portions 70 are provided at the rear portion of the power unit 64, specifically, at the rear portion of the transmission case 68. In FIG. 8, two attachment portions 70 provided on the left side of the rear portion of the transmission case 68 are shown, but two similar attachment portions 70 are also provided on the right side of the rear portion of the transmission case 68. The four attachment portions 70 are disposed at positions corresponding to the two rear upper mount portions 41 and the two rear lower mount portions 42, respectively. A flat mounting surface 70 </ b> A is formed on the surface of each mounting portion 70 facing the rear of the saddle riding type vehicle 1. Furthermore, a fastening hole 71 is formed in each mounting surface 70A, and a screw is formed on the inner peripheral surface of the fastening hole 71.

  The rear part of the power unit 64 and each rear upper mount part 41 and each rear lower mount part 42 are connected using four mount bolts 45 as follows, for example. First, the power unit 64 and the body frame 21 so that the contact surfaces 41A of the two rear upper mount portions 41, the contact surfaces 42A of the two rear lower mount portions 42, and the four attachment surfaces 70A of the transmission case 68 are in contact with each other. And place. Next, for example, the left rear upper mount portion 41 is attached to the attachment portion 70 facing the rear upper mount portion 41. That is, the shaft portion 45A of the mount bolt 45 is passed through the through hole 41D of the rear upper mount portion 41 from the rear of the rear upper mount portion 41, and into the fastening hole 71 of the mounting portion 70 facing the rear upper mount portion 41. Screw it on. In the same manner, the left rear lower mount portion 42, the right rear upper mount portion 41, and the right rear lower mount portion 42 are attached to the attachment portions 70 facing each other. Next, the four mount bolts 45 screwed into the fastening holes 71 are each tightened.

  In this embodiment, each of the rear upper mount portion 41 and the rear lower mount portion 42 arranged at a position distant from the chain arrangement space 28A, that is, the right rear upper mount portion 41 and the rear lower mount portion 42 penetrates each other. The diameters of the holes 41D and 42D are passed through the rear upper mount portion 41 and the rear lower mount portion 42, that is, the left rear upper mount portion 41 and the rear lower mount portion 42, which are disposed at positions close to the chain arrangement space 28, respectively. It may be larger than the diameter of the holes 41D and 42D. Thereby, the position of the chain arrangement space 28A can be determined with high precision by the left rear upper mount part 41 and the rear lower mount part 42, and the right rear upper mount part 41 and the rear lower mount part 42 A dimensional error with the body frame 21 can be absorbed. The through holes 41D and 42D of the right rear upper mount portion 41 and the rear lower mount portion 42 may be elongated holes in the left-right direction.

(Front mount)
Also, as shown in FIG. 4, the left and right down frames 15 are provided with a pair of front mount portions 46 for supporting the front portion of the power unit 64. Each of the front mount portions 46 is formed in a columnar shape from, for example, a metal material, and is arranged so that the extending direction of the axis is the left-right direction of the saddle riding type vehicle 1. Each front mount portion 46 is fixed to the lower end portion of the down frame 15 by, for example, welding. Further, flat contact surfaces 46A are respectively formed on the surfaces facing inward in the front mount portion 46, that is, on the right end surface of the left front mount portion 46 and on the left end surface of the right front mount portion 46, respectively. . Each front mount portion 46 is formed with a through hole 46 </ b> B penetrating in the left-right direction of the saddle riding type vehicle 1.

  At the front part of the power unit 64, specifically the front part of the crankcase 65, the cylinder 66 or the cylinder head 67, flat mounting surfaces are formed on the left and right surfaces thereof, and fastening holes are formed on each mounting surface. A screw is formed on the inner peripheral surface of the fastening hole. The left front mount portion 46 and the power unit 64 are arranged such that the front mount portion 46 and the power unit 64 are in contact with the contact surface 46A of the front mount portion 46 and the left front mounting surface of the power unit 64. The shaft portion of the mount bolt is passed through the through hole 46B of the front mount portion 46 from the left side of the front mount portion 46, and the shaft portion of the mount bolt is inserted into a fastening hole formed on the mounting surface on the left side of the front portion of the power unit 64. Connected by fastening. Similarly, the right front mount portion 46 and the power unit 64 are arranged such that the front mount portion 46 and the power unit 64 are in contact with the contact surface 46A of the front mount portion 46 and the front right mounting surface of the power unit 64. The shaft portion of the mount bolt is passed through the through hole 46B of the front mount portion 46 from the right side of the front mount portion 46, and the shaft portion of the mount bolt is formed on the mounting surface on the front right side of the power unit 64. It is connected by fastening in the fastening hole.

  In addition, a through hole penetrating the portion in the left-right direction is formed in the front wall portion of the power unit 64, and for example, a through hole 46B of the left front mount portion 46, a through hole of the power unit 64, and a right front mount portion 46 are formed. By passing the shaft portion of one long mounting bolt from one side in the left-right direction of the power unit 64 through the through hole 46B of the power unit 64, each nut is fastened to the other end in the left-right direction of the shaft portion of the mounting bolt. The unit 46 and the power unit 64 may be connected.

  Further, the diameter dimension of the through hole 46B of each front mount portion 46 is made larger than the diameter of the shaft portion of the mount bolt that passes through the through hole 46B, and the position of the shaft portion of the mount bolt in the through hole 46B is set in the radial direction. It may be possible to shift. Thereby, after connecting each rear upper mount part 41 and each rear lower mount part 42 of the body frame 21 to the rear part of the power unit 64, each front mount part 40 is connected to the front part of the power unit 64. And dimensional errors between the power unit 21 and the power unit 21 can be absorbed.

  As described above, in the vehicle body frame 11 according to the embodiment of the present invention, the pair of rear upper mount parts 41 protrude downward from the mount support surface 26A of the body frame 21, and each rear upper mount part 41 is connected to the front end thereof. The shape gradually expanded in the front-rear direction from the side toward the base end side. The pair of rear lower mount portions 42 protrude upward from the mount support surface 27A of the body frame 21, and each rear lower mount portion 42 has a shape that gradually expands in the front-rear direction from the distal end side toward the proximal end side. did. Thereby, the area of the junction part of each rear upper mount part 41 and the upper connection part 26 and the area of the junction part of each rear lower mount part 42 and the upper connection part 27 can be enlarged, respectively. In particular, the length in the front-rear direction of these joint portions can be increased. Therefore, the rigidity of each rear upper mount part 41 and each rear lower mount part 42 with respect to a load acting in the front-rear direction can be increased. Therefore, the body frame 21 and the power unit 64 can be firmly coupled in the front-rear direction via the rear upper mount parts 41 and the rear lower mount parts 42 having high rigidity, and the front-rear direction acting on the saddle riding type vehicle 1 Can be dispersed and absorbed by the body frame 21 and the power unit 64.

  Further, each rear upper mount portion 41 and each rear lower mount portion 42 have shapes that gradually narrow in the front-rear direction from the base end side toward the distal end side. By forming each rear upper mount part 41 and each rear lower mount part 42 in such a shape, the through holes 41D and 42D provided on the front end side of each rear upper mount part 41 and each rear lower mount part 42 are respectively provided. Can be shortened. Thereby, the power unit 64 and each back upper mount part 41 can be fastened using the fastening member 45 with a small length dimension, and the power unit 64 and each back lower mount part 42 can be fastened. By reducing the length of the fastening member 45, the rigidity of the fastening member 45 with respect to a load acting in the vertical direction can be increased. Therefore, the power unit 64 and each rear upper mount part 41 can be firmly coupled by the highly rigid fastening member 45, and the power unit 64 and each rear lower mount part 42 can be firmly coupled. Thus, the load acting in the vertical direction on the body frame 21 via the rear cushion unit 79 or the swing arm 77 is reliably transmitted to the power unit 64 via each rear upper mount portion 41 and each rear lower mount portion 42. Can do. Thereby, the said load can be received by both the body frame 21 and the power unit 64, and the said load can be disperse | distributed to the body frame 21 and the power unit 64, and can be absorbed.

  Thus, according to the vehicle body frame 11 according to the embodiment of the present invention, the rigidity of each rear upper mount portion 41, each rear lower mount portion 42, and each fastening member 45 can be increased, thereby the body frame 21. And the power unit 64 can be strengthened. Therefore, the power unit 64 can function as a reinforcing member for the vehicle body frame 11 and the rigidity of the vehicle body frame 11 can be increased.

  Further, when the saddle riding type vehicle 1 is viewed from the side, each rear upper mount portion 41 is formed in a substantially triangular shape surrounded by the mount support surface 26A, the contact surface 41A, and the inclined surface 41B. The bonding area between the rear upper mount portion 41 and the mount support surface 26A can be increased. Thereby, the rigidity of each rear upper mount part 41 with respect to the load which acts on the front-back direction can be improved. Similarly, each rear lower mount portion 42 is formed in a substantially triangular shape surrounded by the mount support surface 27A, the contact surface 42A, and the inclined surface 42B, thereby joining each rear lower mount portion 42 and the mount support surface 27A. The area can be increased, whereby the rigidity of each rear lower mount portion 42 with respect to the load acting in the front-rear direction can be increased.

  Further, when the saddle riding type vehicle 1 is viewed from the side, each rear upper mount portion 41 is formed in a substantially triangular shape surrounded by the mount support surface 26A, the contact surface 41A, and the inclined surface 41B. The through hole 41 </ b> D formed on the front end side of the rear upper mount portion 41 can be shortened. Thereby, the length dimension of the fastening member 45 passed through the through hole 41D can be reduced, and the rigidity of the fastening member 45 against the load acting in the vertical direction can be increased. Similarly, each rear lower mount portion 42 is formed in a substantially triangular shape surrounded by the mount support surface 27A, the contact surface 42A, and the inclined surface 42B, thereby penetrating through the front end side of each rear upper mount portion 42. The hole 42D can be shortened. Thereby, the length dimension of the fastening member 45 passed through the through hole 42D can be reduced, and the rigidity of the fastening member 45 with respect to the load acting in the vertical direction can be increased.

  Further, according to the vehicle body frame 11 of the embodiment of the present invention, the left surface, the right surface, and the rear surface of each rear upper mount portion 41 and the mount support surface 26A of the upper coupling portion 26 are coupled via a gently curved surface or inclined surface. Therefore, stress concentration is unlikely to occur between each rear upper mount portion 41 and the upper coupling portion 26. Similarly, the left surface, right surface, and rear surface of each rear lower mount portion 42 and the mount support surface 27A of the lower connecting portion 27 are coupled via a gently curved surface or inclined surface. Stress concentration is unlikely to occur between the lower connecting portion 27 and the lower connecting portion 27.

  In the vehicle body frame 11 according to the embodiment of the present invention, each rear upper mount portion 41 is formed on the mount support surface 26 </ b> A provided on the lower surface of the upper coupling portion 26. Thus, the position of each rear upper mount portion 41 in the front-rear direction or the left-right direction is arbitrarily set for each rear upper mount portion 41 by arbitrarily selecting the position of each rear upper mount portion 41 in the mount support surface 26A. can do. Therefore, the position of the contact surface 41A in the front-rear direction or the left-right direction can be arbitrarily set for each contact surface 41A. Further, since each rear upper mount portion 41 is configured to project downward from the mount support surface 26A, the vertical position of the contact surface 41A can be contacted by selecting the vertical dimension of each rear upper mount portion 41. It can be arbitrarily set for each surface 41A. Similarly, for each rear lower mount portion 42, the position of the contact surface 42A in the front-rear direction, the left-right direction, or the vertical direction can be arbitrarily set for each contact surface 42A. Thereby, even when the shape of the rear part of the power unit 64 is complicated and the position of the mounting surface 70A is not left-right symmetric, vertically symmetric, or different from each other in the front-rear direction, such mounting surface 70A The positions of the contact surfaces 41A and 42A can be easily determined so as to match the positions. Therefore, even when the shape of the rear part of the power unit 64 is complicated, the body frame 21 can be firmly coupled to such a power unit 64. Further, even if there is a protrusion at the rear part of the power unit 64, the position of the rear upper mount part 41 or the rear lower mount part 42 can be determined so as to avoid the protrusion, and the body frame 21 is attached to the power unit 64 while avoiding the protrusion. Can be tightly coupled to the rear.

  Further, according to the vehicle body frame 11 of the embodiment of the present invention, the pair of rear upper mount portions 41 and the pair of rear lower mount portions 42 are formed so that the contact surfaces 41A and 42A are on the same plane. The assembly accuracy between the power unit 64 and the body frame 21 can be easily increased. That is, when the contact surfaces 41A and 42A are the same plane, the vertical position (front-rear direction) position and inclination accuracy of the contact surfaces 41A and 42A are compared with the case where the contact surfaces are not the same plane. Can be easily increased. Therefore, the assembly accuracy between the power unit 64 and the body frame 21 can be easily increased.

  Further, according to the vehicle body frame 11 of the embodiment of the present invention, each rear upper mount portion 41 and each rear lower mount portion 42 are arranged on the right side of the chain arrangement space 28A. The drive chain 82 can be passed inside the body frame 21 while realizing the connection between the body frame 21 and the power unit 64 via the rear lower mount portion 42.

  In the above-described embodiment, the body frame 11 is provided with the two upper tank rails 13 and the two lower tank rails 14 each made of a pipe, but the number of tank rails is not limited to this. Further, the tank rail may be, for example, aluminum die casting.

  Further, in the above-described embodiments, the case where the front mount portion 46 is provided at the lower end portion of the down frame 15 has been described as an example. However, the front mount portion is provided on the front end side of the tank rail or directly on the head pipe or via a bracket or the like. May be connected.

  Further, in the above-described embodiment, the rear upper mount portion 41 is configured to protrude downward from the mount support surface 26A of the upper connection portion 26 of the body frame 21, and the rear lower mount portion 42 is configured as the lower connection portion 27 of the body frame 21. Although it is configured to protrude upward from the mount support surface 27A, the present invention is not limited to this. For example, the rear upper mount portion 41 may be configured to protrude downward from the mount support surface 26A of the upper coupling portion 26 of the body frame 21, and another configuration may be employed for the rear lower mount portion. Further, the rear lower mount portion 42 may be configured to protrude upward from the mount support surface 27A of the lower connection portion 27 of the body frame 21, and another configuration may be employed for the rear upper mount portion.

  The present invention can also be applied to straddle-type vehicles other than motorcycles, such as motor tricycles and buggy cars.

  In the embodiment described above, the down frame 15 is a specific example of the “connecting member” in the claims. Further, the left rear upper mount portion 41 is a specific example of “first rear mount portion” in the claims, and the right rear upper mount portion 41 is “second rear mount portion” in the claims. This is a specific example. The left rear lower mount portion 42 is a specific example of “third rear mount portion” in the claims, and the right rear lower mount portion 42 is “fourth rear mount portion” in the claims. This is a specific example. The mount bolt 45 is a specific example of the “fastening member” in the claims.

  Further, the present invention can be changed as appropriate without departing from the spirit or concept of the invention which can be read from the claims and the entire specification, and a body frame of a saddle-ride type vehicle with such a change is also provided. It is included in the technical idea of the invention.

1 straddle-type vehicle 11 body frame 12 head pipe 13 upper tank rail (tank rail)
14 Lower tank rail (tank rail)
15 Down frame (connecting member)
DESCRIPTION OF SYMBOLS 21 Body frame 22 Left frame part 23 Right frame part 26 Upper connection part 26A Mount support surface 27 Lower connection part 27A Mount support surface 28 Body frame space 28A Chain arrangement | positioning space 41 Rear upper mount part (1st rear mount part, 2nd Rear mounting part)
42 Rear lower mount (third rear mount, fourth rear mount)
41A, 42A Contact surface 41B, 42B Inclined surface 41D, 42D Through hole 45 Mount bolt (fastening member)
45A Shaft part 46 Front mount part 64 Power unit 68 Transmission case 82 Drive chain

Claims (5)

A body frame of a saddle-ride type vehicle,
A head pipe provided in front of the power unit;
A tank rail extending rearward from the head pipe above the power unit;
A left frame portion extending downward from the rear end portion of the tank rail to the left rear side of the power unit, a right frame portion extending downward from the rear end portion of the tank rail to the right rear side of the power unit, and the left frame portion And a body frame having an upper connecting part for connecting the upper parts of the right frame part and a lower connecting part for connecting the lower parts of the left frame part and the right frame part, and
A front mount portion that is connected to the front end side of the tank rail or the head pipe directly or via a connecting member, and supports the front portion of the power unit;
A rear mount portion for supporting a rear portion of the power unit;
A mount support surface extending in the front-rear and left-right directions is provided on the lower surface of the upper connecting portion or the upper surface of the lower connecting portion,
The rear mount portion protrudes in the vertical direction from the mount support surface, and has a shape that gradually widens in the front-rear direction from the distal end side toward the proximal end side,
The front surface of the rear mount part is provided with a contact surface that comes into contact with the mounting surface facing backward in the power unit,
A through hole for inserting a shaft portion of a fastening member that fastens the rear mount portion into the mounting surface of the power unit is provided at a front end side of the rear mount portion so as to penetrate the rear mount portion in the front-rear direction. Body frame characterized by being. The rear mount portion has an inclined surface that intersects with the mount support surface after extending while tilting backward in the direction of approaching the mount support surface from the tip portion thereof,
The rear mount portion is formed in a substantially triangular shape surrounded by the mount support surface, the contact surface and the inclined surface when the saddle riding type vehicle is viewed from the side. Item 1. The vehicle body frame according to Item 1. The mount support surfaces are provided on the lower surface of the upper connecting portion and the upper surface of the lower connecting portion, respectively.
The rear mount portion includes a first rear mount portion projecting downward from a left side of the mount support surface provided in the upper connection portion, and a lower side from a right side of the mount support surface provided in the upper connection portion. A projecting second rear mount portion; a third rear mount portion projecting upward from the left side of the mount support surface provided in the lower connection portion; and a mount support surface provided in the lower connection portion. The vehicle body frame according to claim 1, further comprising a fourth rear mount portion protruding upward from the right side.   The first rear mount portion, the second rear mount portion, the third rear mount portion, and the fourth rear mount portion are formed so that the contact surfaces thereof are on the same plane. The vehicle body frame according to claim 3.   The body frame has a body frame space surrounded by a right surface of the left frame portion, a left surface of the right frame portion, a lower surface of the upper connecting portion, and an upper surface of the lower connecting portion, and left and right in the body frame space A chain arrangement space for passing a drive chain is formed in a region on one end side in the direction, and the first rear mount portion, the second rear mount portion, the third rear mount portion, and the fourth rear mount portion are The vehicle body frame according to claim 3 or 4, wherein the vehicle body frame is arranged on the other side in the left-right direction with respect to the chain arrangement space.

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