JP6984225B2 - Body frame of saddle-type vehicle - Google Patents

Description

The present invention relates to a body frame of a saddle-mounted vehicle.

There are various types of body frames of saddle-mounted vehicles such as motorcycles, such as cradle frames, diamond frames, backbone frames, and twin spar frames. However, all types of body frames have in common a headpipe that supports the steering shaft and a pair of tank rails (or mainframes) that extend rearward from the headpipe through the left and right sides above the engine. And have. A structure for supporting the front end of the swing arm is provided on the lower rear side of the pair of tank rails. Further, a plurality of seat frames (or seat rails) for supporting the driving seat and the like are connected to the upper rear portion of the pair of tank rails.

Here, focusing on the seat frame, most of the general vehicle body frames include a left side seat frame, a right side seat frame, a left side reinforcing frame, and a right side reinforcing frame. The front end of the left seat frame is connected to the rear upper side of the tank rail on the left side, and the rear end side extends rearward on the rear left side of the engine. Further, the front end of the right seat frame is connected to the rear upper side of the tank rail on the right side, and the rear end side extends rearward on the rear right side of the engine. Further, the front end of the left reinforcing frame is connected to the rear part of the left tank rail, which is lower than the portion to which the front end of the left seat frame is connected, and the rear end is connected to the left seat frame. It is connected to the middle part in the front-back direction. In addition, the front end of the right reinforcing frame is connected to the rear part of the right tank rail, which is lower than the part to which the front end of the right seat frame is connected, and the rear end is connected to the right seat frame. It is connected to the middle part in the front-back direction. The following Patent Document 1 describes such a general vehicle body frame.

Special Fair 7-64299 Gazette

By the way, in races, running on mountain roads, etc., the saddle-type vehicle accelerates, brakes, turns, etc., so that a large load acts on the seat frame from various directions. Therefore, it is required to increase the rigidity of the seat frame. In particular, it is required to increase the rigidity against a load acting laterally on the seat frame when the vehicle turns.

In this regard, it is conceivable to add a reinforcing frame, a reinforcing plate, a bridge, etc. to the seat frame to increase the rigidity of the seat frame, but adding such a reinforcing member makes it difficult to reduce the weight of the seat frame. Not desirable.

The present invention has been made in view of, for example, the above-mentioned problems, and an object of the present invention is to provide a body frame of a saddle-mounted vehicle capable of increasing the rigidity of the seat frame.

In order to solve the above problems, the first aspect of the present invention is a body frame of a saddle-mounted vehicle, in which a head pipe and a front end portion are connected to the head pipe, respectively, and the rear end side is the upper left side of the engine. A pair of tank rails extending rearward on the upper right side, a body frame arranged behind the engine and connected to the rear ends of the pair of tank rails, and a fuel arranged above the engine. The seat frame structure includes a seat frame structure that supports a driver's seat arranged at the rear of the tank, and the seat frame structure includes an upper left seat frame, an upper right seat frame, a lower left seat frame, a lower right seat frame, and a bridge. However, the body frame has a first connection portion arranged on the left front side in the upper part of the body frame, a second connection portion arranged on the right front side in the upper part of the body frame, and an upper portion of the body frame. In the side view of the saddle-mounted vehicle, the first connection portion and the second connection portion are arranged behind and below the first connection portion and the second connection portion, and in the left-right direction, the first connection portion and the second connection portion. It has a third connection portion arranged between the connection portion, the front end portion of the upper left seat frame is connected to the first connection portion, and the rear end side of the upper left seat frame is the rear of the engine. The left side is extended rearward, the front end portion of the upper right seat frame is connected to the second connection portion, the rear end side of the upper right seat frame is extended rearward on the rear right side of the engine, and the lower left seat frame. The front end portion is connected to the third connection portion, the lower left seat frame extends rearward while inclining to the left from the third connection portion, and the rear end portion of the lower left seat frame is the upper left seat frame. It is connected to the rear end side, the front end portion of the lower right seat frame is connected to the third connection portion, and the lower right seat frame extends rearward while inclining to the right from the third connection portion. The rear end portion of the lower right seat frame is connected to the rear end side of the upper right seat frame, and the bridge connects the rear end side of the upper left seat frame and the rear end side of the upper right seat frame. It is a feature.
In order to solve the above problems, a second aspect of the present invention is a body frame of a saddle-mounted vehicle, in which a head pipe and a front end portion are connected to the head pipe, and a rear end side is an engine and the engine. It is provided with a tank rail extending rearward between the fuel tank arranged above and a seat frame structure for supporting the operation seat arranged behind the fuel tank, and the seat frame structure is the upper left seat frame. The tank rail has a first upper right seat frame, a lower left seat frame, a lower right seat frame, and a bridge, and the tank rail has a first connection portion arranged on the left front side on the rear upper side of the tank rail, and the tank. A second connection portion located on the right front side on the rear upper side of the rail, and a side view of the saddle-mounted vehicle on the rear upper side of the tank rail, rather than the first connection portion and the second connection portion. It has a third connection portion that is arranged on the rear side and the lower side, and is arranged between the first connection portion and the second connection portion in the left-right direction, and has a front end portion of the upper left seat frame. Is connected to the first connection portion, the rear end side of the upper left seat frame extends rearward on the rear left side of the engine, and the front end portion of the upper right seat frame is connected to the second connection portion. The rear end side of the upper right seat frame extends rearwardly on the rear right side of the engine, the front end portion of the lower left seat frame is connected to the third connection portion, and the lower left seat frame is left from the third connection portion. The rear end portion of the lower left seat frame is connected to the rear end side of the upper left seat frame, and the front end portion of the lower right seat frame is connected to the third connection portion. The lower right seat frame extends rearward while inclining to the right from the third connection portion, the rear end portion of the lower right seat frame is connected to the rear end side of the upper right seat frame, and the bridge is said. It is characterized in that it is connected between the rear end side of the upper left seat frame and the rear end side of the upper right seat frame.

According to the present invention, the rigidity of the seat frame can be increased. In particular, the rigidity of the seat frame can be increased against a load acting laterally on the seat frame.

FIG. 3 is an external view showing a saddle-mounted vehicle provided with a vehicle body frame according to a first embodiment of the present invention. It is an external view which looked at the car body frame of 1st Embodiment of this invention from the left. It is an external view which looked at the car body frame of 1st Embodiment of this invention from above. It is an external view which looked at the car body frame of 1st Embodiment of this invention from the rear. It is explanatory drawing which shows the body frame in the disassembled state, and the seat frame structure in the body frame of 1st Embodiment of this invention. It is explanatory drawing which shows the connection between a body frame and a seat frame structure in the body frame of 1st Embodiment of this invention. It is an external view which looked at the car body frame of the 2nd Embodiment of this invention from the rear. It is an external view which looked at the car body frame of the 3rd Embodiment of this invention from the left front.

The body frame of the saddle-mounted vehicle according to the embodiment of the present invention includes a head pipe, a pair of tank rails, a body frame, and a seat frame structure.

The head pipe is a tubular member that supports the steering shaft, and is arranged in the front upper part of the saddle-type vehicle, that is, in the front upper part of the engine.

The front end of each pair of tank rails is connected to the head pipe, and the rear end side extends rearward on the upper left side and the upper right side of the engine, respectively.

The body frame is located behind the engine and the rear ends of the pair of tank rails are connected to each other. Further, the body frame has a first connection portion, a second connection portion, and a third connection portion. The first connection portion is arranged on the left front side in the upper part of the body frame. The second connection portion is arranged on the right front side in the upper part of the body frame. The third connection portion is arranged in the upper part of the body frame behind and below the first connection portion and the second connection portion in the side view of the saddle-type vehicle, and is the first in the left-right direction. It is arranged between the connection part and the second connection part. On the other hand, the lower part of the body frame may be provided with a structure for supporting the front end portion of the swing arm.

The seat frame structure is a frame structure that supports an operation seat arranged behind a fuel tank arranged above the engine. The seat frame structure includes an upper left seat frame, an upper right seat frame, a lower left seat frame, a lower right seat frame, and a bridge. The front end of the upper left seat frame is connected to the first connection, and the rear end of the upper left seat frame extends rearward on the rear left side of the engine. Further, the front end portion of the upper right seat frame is connected to the second connection portion, and the rear end side of the upper right seat frame extends rearward on the rear right side of the engine. Further, the front end portion of the lower left seat frame is connected to the third connection portion, and the rear end portion of the lower left seat frame is connected to the rear end side of the upper left seat frame. Further, the front end portion of the lower right seat frame is connected to the third connecting portion, and the rear end portion of the lower right seat frame is connected to the rear end side of the upper right seat frame. Further, the bridge connects the rear end side of the upper left seat frame and the rear end side of the upper right seat frame.

The seat frame structure in the vehicle body frame according to the embodiment of the present invention is a triangular frame formed by an upper left seat frame, a lower left seat frame, and a portion between a first connection portion and a third connection portion in the body frame. It has a structure. Further, the seat frame structure has a triangular frame structure formed by an upper right seat frame, a lower right seat frame, and a portion between a second connection portion and a third connection portion in the body frame. There is. Further, the seat frame structure has a triangular frame structure formed by a lower left seat frame, a lower right seat frame, and a bridge. Further, the front end of the upper left seat frame is connected to the first connection, the front end of the upper right seat frame is connected to the second connection, and the front end of the lower left seat frame and the front end of the lower right seat frame are the first. By being connected to the connection portion of 3, the front end portion of the seat frame structure includes a portion between the first connection portion and the second connection portion in the body frame and a second connection portion in the body frame. A triangular skeleton structure is formed consisting of a portion between the and the third connection portion and a portion between the third connection portion and the first connection portion in the body frame. With these triangular skeleton structures, the rigidity of the seat frame structure can be increased. In particular, in the seat frame structure, the triangular skeleton structure formed from the lower left seat frame, the lower right seat frame, and the bridge makes it possible to apply a load acting laterally to the seat frame structure when, for example, a saddle-mounted vehicle turns. On the other hand, the rigidity of the seat frame structure can be increased.

Further, according to the seat frame structure in the vehicle body frame according to the embodiment of the present invention, a large number of triangular frame structures are formed by connecting each of the seat frames constituting the seat frame structure, thereby forming the seat frame structure. The rigidity of the can be increased. Therefore, the rigidity of the seat frame structure can be increased, the number of parts of the seat frame structure can be reduced, and the weight of the seat frame structure can be reduced without adding a large number of reinforcing members.

(Saddle-mounted vehicle)
FIG. 1 shows a state in which a saddle-mounted vehicle 1 provided with a vehicle body frame 11 according to a first embodiment of the present invention is viewed from the left. In each of the following embodiments, the driver of the saddle-mounted vehicle 1 is used as a reference when describing the direction regarding the arrangement and shape of the parts. The front (F), rear (B), left (L), right (R), top (U), and bottom (D) indicated by the arrows drawn at the bottom right of each figure indicate the driver of the saddle-mounted vehicle 1. It shows the reference direction.

In FIG. 1, the saddle-mounted vehicle 1 is, for example, a motorcycle. The saddle-mounted vehicle 1 includes a vehicle body frame 11 that forms its skeleton. A steering shaft 81 is supported on the front portion of the vehicle body frame 11, a front fork 82 is supported on the steering shaft 81 via a bracket, and a front wheel 83 is supported on the front fork 82. Further, the engine 84 is supported in a substantially intermediate portion in the front-rear direction of the vehicle body frame 11. The engine 84 includes a crankcase 85, a cylinder 86 and a cylinder head 87. Further, a muffler 88 is provided below the engine 84. Further, the exhaust port provided in the front portion of the cylinder head 87 and the muffler 88 are connected by an exhaust pipe 89. Further, the front end portion of the swing arm 90 is supported on the lower rear side of the vehicle body frame 11, and the rear wheel 91 is supported on the rear end side of the swing arm 90. Further, a fuel tank 92 is provided on the upper side of the vehicle body frame 11, and an operation seat 93 is provided behind the fuel tank 92.

(Body frame)
FIG. 2 shows a state in which the vehicle body frame 11 is viewed from the left, FIG. 3 shows a state in which the vehicle body frame 11 is viewed from above, and FIG. 4 shows a state in which the vehicle body frame 11 is viewed from the rear. In FIG. 4, for convenience of explanation, the parts other than the body frame 21 and the seat frame structure 51 are shown by the alternate long and short dash lines in the vehicle body frame 11. FIG. 5 shows the body frame 21 and the seat frame structure 51 in a disassembled state. FIG. 6 shows a connection structure between the body frame 21 and the seat frame structure 51.

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 tubes 15, a plurality of reinforcing members 16, and a plurality of reinforcing frames 17. , A body frame 21 and a seat frame structure 51.

The head pipe 12 is a tubular member made of a metal such as steel, and is arranged in the front upper part of the saddle-mounted vehicle 1, that is, in the front upper part of the engine 84, as shown in FIG. A steering shaft 81 is rotatably supported in the head pipe 12.

Each upper tank rail 13, each lower tank rail 14, each down tube 15, and each reinforcing frame 17 is a pipe made of a metal such as steel. The front ends of the pair of upper tank rails 13 are connected to the upper part of the head pipe 12, and the rear end side extends rearward while inclining the upper left side and the upper right side of the engine 84 downward. Further, as shown in FIG. 3, the pair of upper tank rails 13 have their front end portions close to each other, but expand greatly in the left-right direction as they extend rearward. After that, as can be seen by comparing FIGS. 1 and 3, the pair of upper tank rails 13 gradually extend to the rear around the cylinder head 87 of the engine 84 in a plan view. Are approaching.

The pair of lower tank rails 14 are arranged below the pair of upper tank rails 13. The front ends of the pair of lower tank rails 14 are connected to the lower part of the head pipe 12, and the rear end side extends rearward while inclining the upper left side and the upper right side of the engine 84 downward. Further, as shown in FIG. 3, the pair of lower tank rails 14 follow the same trajectory 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. 2, the pair of down tubes 15 have their front ends connected to the front end side of the pair of lower tank rails 14, and the rear end side extends downward while slightly inclining backward. Further, a first engine mount portion 71 is provided at the lower end portion of each down tube 15. As shown in FIG. 1, the left front portion of the cylinder 86 or the left front portion of the cylinder head 87 is fixed to the first engine mount portion 71 on the left side. Further, the right front portion of the cylinder 86 or the right front portion of the cylinder head 87 is fixed to the first engine mount portion 71 on the right side.

Further, as shown in FIG. 4, a reinforcing member 16 for reinforcing 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. Further, a reinforcing member 16 for reinforcing 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. Further, as shown in FIG. 2, on the left side of the vehicle body frame 11, two reinforcing frames 17 are provided between the upper tank rail 13 and the lower tank rail 14. Further, a reinforcing frame 17 is also provided between a portion of the lower tank rail 14 behind the portion to which the upper end portion of the down tube 15 is connected and the lower end portion of the down tube 15. Similarly, a plurality of reinforcing frames 17 are provided on the right side of the vehicle body frame 11.

(Body frame)
The body frame 21 has a function of supporting the rear end portion of each upper tank rail 13 and the rear end portion of each lower tank rail 14, a function of supporting the front end portion of the swing arm 90, and a function of supporting the seat frame structure 51. It is a frame that also has. As shown in FIG. 1, the body frame 21 is arranged behind the engine 84.

As shown in FIG. 4, the body frame 21 has a left frame portion 22 arranged on the rear left side of the engine 84, a right frame portion 23 arranged on the rear right side of the engine 84, and an upper portion and a right side of the left frame portion 22. It includes an upper connecting portion 26 that connects the upper portion of the frame portion 23, and a lower connecting portion 27 that connects the lower portion of the left frame portion 22 and the lower portion of the right frame portion 23.

As shown in FIG. 5, the left frame portion 22 is formed by joining the inner plate portion 24 and the outer plate portion 25 to each other. That is, the inner plate portion 24 and the outer plate portion 25 are each formed by pressing a metal plate. The front edge and the rear edge of the inner plate 24 are each bent so as to project to the left. Further, the front edge portion and the rear side edge portion of the outer plate portion 25 are bent so as to project to the right, respectively. In the left frame portion 22, the front and rear edges of the inner plate portion 24 and the front and rear edges of the outer plate portion 25 are aligned with each other, and the front edge portion and the outer plate portion of the inner plate portion 24 are aligned with each other. It is formed by welding the front edge portion of 25 and welding the rear edge portion of the inner plate portion 24 and the rear edge portion of the outer plate portion 25. On the other hand, 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, similarly to the left frame portion 22. On the other hand, the upper connecting portion 26 and the lower connecting portion 27 are each formed of a metal such as iron or aluminum, and these are formed by casting, for example. 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, respectively, by welding, for example. Further, 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, respectively, by welding, for example.

Further, as shown in FIG. 4, the upper portion of the body frame 21 has a narrowed shape with a smaller width toward the rear. As a result, the upper rear portion (the portion from the driver's seat 93 to the rear thereof) of the saddle-mounted vehicle 1 can be made into a sharp design whose width is narrowed toward the rear.

Further, as shown in FIG. 2, two tank rail connecting portions 28 are provided on the front side of the upper left portion of the body frame 21. Of these tank rail connection portions 28, the rear end portion of the left upper tank rail 13 is connected to the upper tank rail connection portion 28, and the rear end portion of the left upper tank rail 13 is connected to the lower tank rail connection portion 28. The ends are connected. Further, as shown in FIG. 3, two tank rail connecting portions 28 are also provided on the front side of the upper right portion of the body frame 21. Of these tank rail connection portions 28, the rear end portion of the upper tank rail 13 on the right side is connected to the upper tank rail connection portion 28, and the rear end portion of the lower tank rail 14 on the right side is connected to the lower tank rail connection portion 28. The ends are connected.

Further, as shown in FIG. 5, the two tank rail connecting portions 28 on the left side are formed in a portion where the outer plate portion 25 and the upper connecting portion 26 of the left frame portion 22 are combined. The rear ends of the upper tank rail 13 and the lower tank rail 14 on the left side are welded to the upper connecting portion 26 and the outer plate portion 25, respectively. Similarly, the two tank rail connecting portions 28 on the right side are formed in a portion where the outer plate portion 25 and the upper connecting 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. The rear ends of each of the rails are welded to the upper connecting portion 26 and the outer plate portion 25, respectively.

Further, as shown in FIG. 2, a second engine mount portion 72 is provided on the upper left front side of the body frame 21 and below the lower left tank rail connection portion 28. Similarly, a second engine mount portion 72 is also provided on the front side of the upper right portion of the body frame 21 and below the tank rail connecting portion 28 on the lower right side. Each second engine mount portion 72 is integrally formed with the upper connecting portion 26. The rear upper side of the crankcase 85 of the engine 84 (the rear upper side of the portion constituting the transmission case) is fixed to each of the second engine mount portions 72.

Further, a third engine mount portion 73 is provided on the front side of the lower left portion of the body frame 21. Similarly, a third engine mount portion 73 is also provided on the front side of the lower right portion of the body frame 21. The rear lower side of the crankcase 85 of the engine 84 (the rear lower side of the portion constituting the transmission case) is fixed to each third engine mount portion 73. Each third engine mount portion 73 is integrally formed with the lower connecting portion 27.

Further, in the body frame 21, a pivot support portion 30 is provided at a substantially intermediate portion in the vertical direction of the left frame portion 22 and a substantially intermediate portion in the vertical direction of the right frame portion 23, respectively. The front end portion of the swing arm 90 is rotatably supported between the pivot support portions 30.

Further, as shown in FIG. 4, a rear cushion connecting 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 94 is connected to the rear cushion connecting portion 31. Further, a part of the link member 95 that connects the lower end portion of the rear cushion 94 and the swing arm 90 is connected to the link member connecting portion 32.

Further, as shown in FIG. 1, footrests 97 are attached to the rear portion of the left frame portion 22 in the vertical direction substantially intermediate portion and the rear portion of the right frame portion 23 in the vertical direction substantially intermediate portion via the stay 96, respectively. There is.

Further, as shown in FIG. 5, on the upper surface of the body frame 21, specifically, the upper surface 26A of the upper connecting portion 26, a first seat frame connecting portion 41 for connecting the seat frame structure 51 to the body frame 21 , A second seat frame connecting portion 42 and a third seat frame connecting portion 43 are provided. The first seat frame connecting portion 41 is arranged on the left front side of the upper surface 26A of the upper connecting portion 26. Specifically, the first seat frame connecting portion 41 is arranged above the tank rail connecting portion 28 to which the rear end portion of the upper tank rail 13 on the left side is connected. Further, the second seat frame connecting portion 42 is arranged on the right front side of the upper surface 26A of the upper connecting portion 26. Specifically, the second seat frame connecting portion 42 is arranged above the tank rail connecting portion 28 to which the rear end portion of the upper tank rail 13 on the right side is connected. Further, in the upper surface 26A of the upper connecting portion 26, the third seat frame connecting portion 43 is the first seat frame connecting portion 41 and the second seat frame in the side view of the saddle-mounted vehicle 1 as shown in FIG. It is arranged behind and below the connection portion 42, and is arranged between the first seat frame connection portion 41 and the second seat frame connection portion 42 in the left-right direction as shown in FIG. ..

Further, as shown in FIGS. 2 and 4, the upper surface 26A of the upper connecting portion 26 is a plane that inclines downward toward the rear. The first seat frame connecting portion 41, the second seat frame connecting portion 42, and the third seat frame connecting portion 43 provided on the upper surface 26A are arranged on the same plane.

Further, a fastening member 66 for fixing the seat frame structure 51 to the body frame 21 is fastened to the first seat frame connecting portion 41, the second seat frame connecting portion 42, and the third seat frame connecting portion 43. Fastening holes 44 for each are formed. Further, a screw is formed on the inner peripheral surface of the fastening hole 44.

(Seat frame structure)
The seat frame structure 51 is a frame structure that mainly supports the driving seat 93. As shown in FIGS. 2 and 3, the seat frame structure 51 includes an upper left seat frame 52, an upper right seat frame 53, a lower left seat frame 54, a lower right seat frame 55, a first bridge 56, and a left connection. It has a frame 57, a right connecting frame 58, a second bridge 59, and first, second, and third connecting members 61, 62, 63.

The upper left seat frame 52, the upper right seat frame 53, the lower left seat frame 54, the lower right seat frame 55, the first bridge 56, the left connecting frame 57, the right connecting frame 58 and the second bridge 59 are made of metal such as steel. It is a formed pipe.

The front end portion of the upper left seat frame 52 is connected to the first seat frame connecting portion 41 of the body frame 21 via the first connecting member 61. This connection structure is, for example, as follows. That is, as shown in FIG. 6, a first connecting member 61 is joined to the front end portion of the upper left seat frame 52 by, for example, welding. The first connecting member 61 is made of metal and can penetrate only the large-diameter insertion hole 64 into which the head of the fastening member 66 such as a bolt can be inserted and the shaft portion of the fastening member 66. It is provided with a through hole 65 having a small diameter. In the first connecting member 61, the first connecting member 61 is placed on the first seat frame connecting portion 41, the fastening member 66 is inserted into the insertion hole 64 from above the first connecting member 61, and further. By passing the shaft portion of the fastening member 66 through the through hole 65 and further tightening the shaft portion of the fastening member 66 into the fastening hole 44 of the first seat frame connecting portion 41, the fastening member 66 is fastened to the first seat frame connecting portion 41. ing. Then, by fastening the first connecting member 61 to the first seat frame connecting portion 41 in this way, the front end portion of the upper left seat frame 52 is fixed to the first seat frame connecting portion 41.

The front end portion of the upper right seat frame 53 is connected to the second seat frame connecting portion 42 of the body frame 21 via the second connecting member 62. This connection structure is the same as the connection structure between the front end portion of the upper left seat frame 52 and the first seat frame connection portion 41.

Further, as shown in FIG. 2, the rear end side of the upper left seat frame 52 extends rearward in a substantially straight line while inclining the rear left side of the engine 84 upward. Further, the rear end side of the upper right seat frame 53 extends rearward in a substantially straight line while inclining the rear right side of the engine 84 upward. Further, as shown in FIG. 3, the upper left seat frame 52 and the upper right seat frame 53 are slightly inclined inward in the left-right direction so as to approach each other toward the rear. As a result, in the upper left seat frame 52 and the upper right seat frame 53, the distance between the rear ends is smaller than the distance between the front ends.

On the other hand, the front end portion of the lower left seat frame 54 and the front end portion of the lower right seat frame 55 are connected to the third seat frame connecting portion 43 of the body frame 21 via the third connecting member 63. This connection structure is, for example, as follows. That is, as shown in FIG. 3, the front end portion of the lower left seat frame 54 and the front end portion of the lower right seat frame 55 are respectively joined to the third connecting member 63 by welding, for example. Like the first connecting member 61, the third connecting member 63 includes a large-diameter insertion hole 64 and a small-diameter through hole 65. The third connecting member 63 places the third connecting member 63 on the third seat frame connecting portion 43, inserts the fastening member 66 into the insertion hole 64 from above the third connecting member 63, and further inserts the fastening member 66. By passing the shaft portion of the fastening member 66 through the through hole 65 and further tightening the shaft portion of the fastening member 66 into the fastening hole 44 of the third seat frame connecting portion 43, the fastening member 66 is fastened to the third seat frame connecting portion 43. ing. Then, by fastening the third connecting member 63 to the third seat frame connecting portion 43 in this way, the front end portion of the lower left seat frame 54 and the front end portion of the lower right seat frame 55 are connected to the third seat frame. It is fixed to the portion 43.

Further, as shown in FIGS. 2 and 3, the rear end side of the lower left seat frame 54 extends linearly backward while being inclined upward and to the left. The rear end portion of the lower left seat frame 54 is connected to the rear end portion of the upper left seat frame 52 by welding, for example. On the other hand, the rear end side of the lower right seat frame 55 extends linearly backward while being inclined upward and to the right. The rear end portion of the lower right seat frame 55 is connected to the rear end portion of the upper right seat frame 53 by welding, for example.

Further, as shown in FIG. 3, the first bridge 56 connects the rear end portion of the upper left seat frame 52 and the rear end portion of the upper right seat frame 53. As a result, the rear end portion of the lower left seat frame 54 and the rear end portion of the lower right seat frame 55 are also connected by the first bridge 56. Further, the left end side of the first bridge 56 projects to the left of the upper left seat frame 52, and the right end side of the first bridge 56 projects to the right of the upper right seat frame 53.

The front end of the left connecting frame 57 is connected to the front end of the lower left seat frame 54, for example, by welding. Further, the front end portion of the right connecting frame 58 is connected to the front end portion of the lower right seat frame 55 by, for example, welding. It is desirable that the front end portion of the left connecting frame 57 and the front end portion of the right connecting frame 58 are directly connected to the third connecting member 63. However, in this embodiment, it is difficult to secure a space required for connecting the front end portion of the left connecting frame 57 and the front end portion of the right connecting frame 58 in the third connecting member 63, so that the left connecting frame 57 The front end and the front end of the right connecting frame 58 are connected to a portion very close to the third connecting member 63, that is, the front end of the lower left seat frame 54 and the front end of the lower right seat frame 55, respectively.

Further, as shown in FIGS. 2 and 3, the rear end portion of the left connecting frame 57 extends linearly backward while being inclined upward and to the left. The rear end portion of the left connecting frame 57 is connected between the front end portion and the rear end portion of the upper left seat frame 52, specifically, in the present embodiment, to the intermediate portion in the front-rear direction of the upper left seat frame 52 by welding, for example. ing. The rear end portion of the right connecting frame 58 extends linearly backward while being inclined upward and to the right. The rear end portion of the right connecting frame 58 is connected between the front end portion and the rear end portion of the upper right seat frame 53, specifically, in the present embodiment, to the intermediate portion in the front-rear direction of the upper right seat frame 53 by welding, for example. ing.

As shown in FIG. 3, the second bridge 59 is connected to a portion of the upper left seat frame 52 to which the rear end portion of the left connecting frame 57 is connected and a portion of the upper right seat frame 53 to which the rear end portion of the right connecting frame 58 is connected. It is connected to the bridge.

In the vehicle body frame 11 of the embodiment of the present invention having such a configuration, a large number of triangular skeleton structures are formed in the seat frame structure 51, and the rigidity of the seat frame structure 51 due to these triangular skeleton structures. Can be enhanced.

Specifically, first, as shown in FIG. 2, as can be seen from the left side of the seat frame structure 51, the seat frame structure 51 includes an upper left seat frame 52, a lower left seat frame 54, and an upper connecting portion. In 26, a triangular skeleton structure including a portion between the first seat frame connecting portion 41 and the third seat frame connecting portion 43 is formed. Further, the seat frame structure 51 includes the front portion of the upper left seat frame 52, the left connecting frame 57, and the upper connecting portion 26 between the first seat frame connecting portion 41 and the third seat frame connecting portion 43. A triangular skeleton structure consisting of parts is formed. Further, the seat frame structure 51 is formed with a triangular frame structure including a rear portion of the upper left seat frame 52, a lower left seat frame 54, and a left connecting frame 57. Further, as can be seen from the right side of the seat frame structure 51, the seat frame structure 51 includes an upper right seat frame 53, a lower right seat frame 55, and a second seat frame connecting portion 42 and a second seat frame connecting portion 26 in the upper connecting portion 26. A triangular skeleton structure including a portion between the seat frame connecting portion 43 of 3 is formed. Further, the seat frame structure 51 includes the front portion of the upper right seat frame 53, the right connecting frame 58, and the upper connecting portion 26 between the second seat frame connecting portion 42 and the third seat frame connecting portion 43. A triangular skeleton structure consisting of parts is formed. Further, the seat frame structure 51 is formed with a triangular frame structure including a rear portion of the upper right seat frame 53, a lower right seat frame 55, and a right connecting frame 58. Due to these triangular skeleton structures in the seat frame structure 51, as shown in FIG. 2, the rigidity of the seat frame structure 51 with respect to the vertical load L1 acting on the seat frame structure 51 from above or below the seat frame structure 51. Can be enhanced. For example, it is possible to increase the rigidity of the saddle-mounted vehicle 1 with respect to the load L1 acting in the vertical direction on the seat frame structure 51 when the saddle-mounted vehicle 1 passes over the unevenness of the ground.

Further, as shown in FIG. 3, as can be seen from above, the seat frame structure 51 is a triangle composed of a lower left seat frame 54, a lower right seat frame 55, and a first bridge 56. The skeleton structure of is formed. Further, the seat frame structure 51 is formed with a triangular frame structure including a left connecting frame 57, a right connecting frame 58, and a second bridge 59. Further, at the front end portion of the seat frame structure 51, a portion between the first seat frame connecting portion 41 and the second seat frame connecting portion 42 in the upper connecting portion 26, and a second seat in the upper connecting portion 26. It consists of a portion between the frame connecting portion 42 and the third seat frame connecting portion 43, and a portion in the upper connecting portion 26 between the third seat frame connecting portion 43 and the first seat frame connecting portion 41. It can be considered that a triangular frame structure is formed. Due to these triangular frame structures in the seat frame structure 51, as shown in FIG. 3, the seat frame structure 51 with respect to the lateral load L2 acting on the seat frame structure 51 from the left or right side of the seat frame structure 51. The rigidity of the can be increased. For example, it is possible to increase the rigidity against the load L2 acting laterally on the seat frame structure 51 when the saddle-mounted vehicle 1 turns.

Further, according to the seat frame structure 51 in the vehicle body frame 11 of the embodiment of the present invention, the seat frames 52, 53, 54, 55, 57, 58 and the bridges 56, 59 constituting the seat frame structure 51 are respectively. By connecting, a large number of triangular frame structures can be formed, whereby the rigidity of the seat frame structure 51 can be increased. Therefore, the rigidity of the seat frame structure 51 can be increased, the number of parts of the seat frame structure 51 can be reduced, and the weight of the seat frame structure 51 can be reduced without adding a large number of reinforcing members.

Further, in the vehicle body frame 11 of the embodiment of the present invention, the first seat frame connecting portion 41, the second seat frame connecting portion 42, and the third seat frame connecting portion 43 are the body frame 21 (upper connecting portion 26). It is provided on the upper surface 26A. Then, the first connecting member 61 joined to the front end portion of the upper left seat frame 52 is fixed to the first seat frame connecting portion 41 by tightening the fastening member 66 from above the first connecting member 61. .. Further, the second connecting member 62 joined to the front end portion of the upper right seat frame 53 is fixed to the second seat frame connecting portion 42 by tightening the fastening member 66 from above the second connecting member 62. .. Further, the third connecting member 63 joined to the front end portion of the lower left seat frame 54 and the front end portion of the lower right seat frame 55 tightens the fastening member 66 from above the third connecting member 63, thereby tightening the third seat. It is fixed to the rail connection portion 43. With such a configuration, it is possible to suppress slackening of each fastening member 66, maintain a state in which the seat frame structure 51 is firmly fixed to the body frame 21, and increase the rigidity of the vehicle body frame 11. can.

That is, in general, a fastening member such as a bolt is tightened by rotating it clockwise, for example, and loosened by rotating it counterclockwise. Therefore, for example, when a load acts on the fastening member in the counterclockwise direction and the fastening member rotates counterclockwise due to the load, the fastening member loosens. Compared to this, when a load is applied to the fastening member in the axial direction, the fastening member is less likely to loosen. In this regard, as shown in FIG. 6, when a vertical load L1 acts on the seat frame structure 51, a force F is applied to each fastening member 66 fixing the seat frame structure 51 to the body frame 21 in the axial direction. Works. Therefore, each fastening member 66 is unlikely to loosen with respect to the load L1 acting in the vertical direction on the seat frame structure 51. Further, as shown in FIG. 3, since the seat frame structure 51 is fixed to the body frame 21 by three seat frame connection points 41, 42, 43 arranged on the upper surface of the body frame 21, the seat frame structure 51 has a seat frame structure 51. The seat frame structure 51 does not rotate with respect to the body frame 21 due to the load L2 acting in the lateral direction. Therefore, since no load acts on each fastening member 66 in the counterclockwise direction, each fastening member 66 is unlikely to loosen. Therefore, according to the vehicle body frame 11 of the embodiment of the present invention, it is possible to suppress loosening of each fastening member 66 by both the vertical load L1 acting on the seat frame structure 51 and the lateral load L2. The seat frame structure 51 can be maintained in a state of being firmly fixed to the body frame 21, and the rigidity of the vehicle body frame 11 can be increased.

Further, in the vehicle body frame 11 of the embodiment of the present invention, the first seat frame connecting portion 41, the second seat frame connecting portion 42, and the third seat frame connecting portion 43 are arranged on the same plane. The connection between the seat frame structure 51 and the body frame 21 can be easily and highly accurately performed. That is, in general, when processing for making holes in a plurality of parts of a member, for example, if the plurality of parts are arranged on the same plane, the processing becomes easy and the processing accuracy is improved. Further, when fastening members to a plurality of parts of a structure and fixing the parts to the structure, if the plurality of parts are arranged on the same plane, the process of fastening the fastening members can be easily performed. Therefore, the tightening torque of each fastening member can be controlled with high accuracy. In this regard, according to the vehicle body frame 11 of the embodiment of the present invention, the first seat frame connecting portion 41, the second seat frame connecting portion 42, and the third seat frame connecting portion 43 are on the upper surface 26A of the body frame 21. Since they are arranged on the same plane, the fastening holes 44 can be easily and highly accurately formed in the first seat frame connecting portion 41, the second seat frame connecting portion 42, and the third seat frame connecting portion 43. can. Further, the first connecting member 61, the second connecting member 62, and the third connecting member 63 are attached to the first seat frame connecting portion 41, the second seat frame connecting portion 42, and the third seat frame connecting portion 43. When fixing each of the fastening members 66, the tightening step of each fastening member 66 can be easily performed, and the tightening torque of each fastening member 66 can be controlled with high accuracy. Therefore, the connection between the seat frame structure 51 and the body frame 21 can be easily and highly accurately performed.

Further, according to the vehicle body frame 11 of the embodiment of the present invention, the front end portion of the lower left seat frame 54 and the front end portion of the lower right seat frame 55 are connected to a single connecting portion (third seat frame connecting portion 43). Therefore, it is possible to reduce the number of places where the connecting portion for connecting the seat frame structure 51 is provided in the body frame 21. Therefore, the body frame 21 can be miniaturized. Further, the degree of freedom in the design of the body frame 21 can be increased. For example, when the design of the saddle-mounted vehicle 1 in which the upper rear portion of the vehicle is narrowed (sharpened) is adopted, the design is adopted. The body frame 21 can be easily formed into a shape in which the upper rear portion is narrowed according to the design of the vehicle.

FIG. 7 shows a state in which the vehicle body frame 101 of the second embodiment of the present invention is viewed from the rear. As shown in FIG. 7, the vehicle body frame 101 of the second embodiment of the present invention includes a head pipe 102, a tank rail 103, and a seat frame structure 105. Comparing the vehicle body frame 101 of the second embodiment with the vehicle body frame 11 of the first embodiment, the head pipe 102 in the second embodiment is similar to the head pipe 12 in the first embodiment. Further, the seat frame structure 105 in the second embodiment is the same as the seat frame structure 51 in the first embodiment. Therefore, the components of the seat frame structure 105 are designated by the same reference numerals as the components of the seat frame structure 51 in the first embodiment, and the description thereof will be omitted. However, the tank rail 103 in the second embodiment is different from that in the first embodiment as described later. Further, the vehicle body frame 101 in the second embodiment does not have a body frame (the function of the body frame is possessed by the tank rail 103).

The vehicle body frame 101 of the second embodiment includes one tank rail 103. The tank rail 103 is, for example, die-cast aluminum, the front end thereof is connected to the head pipe 102, and the rear end side extends rearward between the engine and the fuel tank arranged above the engine. Further, the width dimension of the rear upper side of the tank rail 103 becomes larger, and a flat upper surface 103A that inclines downward toward the rear is formed in the portion of the tank rail 103. Further, the lower rear portion of the tank rail 103 extends downward from the rear of the engine, and the portion of the tank rail 103 is provided with a pivot support portion 104 that supports the front end portion of the swing arm. Further, although not shown, a plurality of engine mount portions for supporting the engine are provided on the front portion and the rear portion of the tank rail 103.

The flat upper surface 103A formed on the upper rear side of the tank rail 103 is provided with a first seat frame connecting portion 111, a second seat frame connecting portion 112, and a third seat frame connecting portion 113. The first seat frame connecting portion 111 is arranged on the left front side of the upper surface 103A. The second seat frame connecting portion 112 is arranged on the right front side of the upper surface 103A. The third seat frame connecting portion 113 is arranged on the upper surface 103A behind and below the first seat frame connecting portion 111 and the second seat frame connecting portion 112 in the side view of the saddle-mounted vehicle. Moreover, it is arranged between the first seat frame connecting portion 111 and the second seat frame connecting portion 112 in the left-right direction. That is, the arrangement of the first seat frame connecting portion 111, the second seat frame connecting portion 112, and the third seat frame connecting portion 113 is provided on the upper surface 26A of the body frame 21 in the first embodiment. This is the same as the arrangement of the seat frame connecting portion 41, the second seat frame connecting portion 42, and the third seat frame connecting portion 43. Then, the first seat frame connecting portion 111, the second seat frame connecting portion 112, and the third seat frame connecting portion 113 are connected to the first connecting member of the seat frame structure 105, as in the first embodiment. 61, the second connecting member 62 and the third connecting member 63 are connected, respectively.

The vehicle body frame 101 of the second embodiment of the present invention having such a configuration can also obtain the same effect as the vehicle body frame 11 of the first embodiment of the present invention.

FIG. 8 shows a vehicle body frame 121 according to a third embodiment of the present invention. As shown in FIG. 8, the vehicle body frame 121 of the third embodiment of the present invention includes a head pipe 122, a tank rail 123, a down tube 124, a pair of left and right lower frames 125, and a seat frame structure 127. The head pipe 122 in the third embodiment is the same as the head pipe 12 in the first embodiment. Further, the seat frame structure 127 in the third embodiment is the same as the seat frame structure 51 in the first embodiment. Therefore, the components of the seat frame structure 127 are designated by the same reference numerals as the components of the seat frame structure 51 in the first embodiment, and the description thereof will be omitted.

In the vehicle body frame 121 of the third embodiment, the front end portion of one tank rail 123 is connected to the upper part of the head pipe 122, and one down tube 124 is connected to the lower part of the head pipe 122. Further, a pair of left and right lower frames 125 are connected between the rear end of the tank rail 123 and the rear end of the down tube 124, and the engine is connected by the tank rail 123, the down tube 124 and the pair of lower frames 125. It is configured to support. The pair of lower frames 125 can have the same functions as the body frame 21 of the first embodiment. In that respect, the pair of lower frames 125 corresponds to a body frame.

Further, the seat frame structure 127 is connected to the rear upper side of the lower frame 125. That is, the first seat frame connecting portion 131 is provided on the upper rear side of the lower frame 125 on the left side, the second seat frame connecting portion 132 is provided on the upper rear side of the lower frame 125 on the right side, and the rear portion of the lower frame 125 on the left side is provided. A third seat frame connecting portion 133 is provided at the left-right intermediate portion of the bridge frame 126 bridged between the right lower frame 125 and the rear portion of the right lower frame 125. The seat frame structure 127 is connected to the first seat frame connecting portion 131, the second seat frame connecting portion 132, and the third seat frame connecting portion 133.

The rigidity of the seat frame structure 127 can also be increased by the vehicle body frame 101 of the third embodiment of the present invention having such a configuration.

In the first embodiment described above, the case where two tank rails are provided on the left side and two on the right side is taken as an example, but one tank rail may be provided on each of the left side and the right side.

Further, in the first embodiment described above, the rear end portion of the lower left seat frame 54 is connected to the rear end portion of the upper left seat frame 52, and the rear end portion of the lower right seat frame 55 is connected to the rear end portion of the upper right seat frame 53. The case where the rear end portion of the upper left seat frame 52 and the rear end portion of the upper right seat frame 53 are connected by the first bridge 56 is taken as an example, but the upper left seat frame 52 is connected to the lower left seat frame 54. It may extend further rearward from the portion to which the rear end portion and the first bridge 56 are connected. Similarly, the upper right seat frame 53 may be further extended rearward from the rear end of the lower right seat frame 55 and the portion to which the first bridge 56 is connected.

Further, in the first embodiment described above, the front end portion of the left connecting frame 57 is connected to the front end portion of the lower left seat frame 54, and the front end portion of the right connecting frame 58 is connected to the front end portion of the lower right seat frame 55. For example, when the third connecting member 63 has a connecting space, the front ends of the left connecting frame 57 and the right connecting frame 58 may be connected to the third connecting member 63. Further, the connection position between the rear end portion of the left connecting frame 57 and the upper left seat frame 52 and the connection position between the rear end portion of the right connecting frame 58 and the upper right seat frame 53 are, for example, the connection positions of the parts arranged below the operation seat 93. It can be shifted forward and backward in consideration of the layout and the like.

Further, the vehicle body frame of the present invention can be applied to a saddle-mounted vehicle other than a motorcycle. Further, the model of the engine, the arrangement of the muffler, the shape of the exhaust pipe, and the like are not limited to those of the embodiment.

Further, in each of the above-described embodiments, the first bridge 56 is a specific example of the "bridge" in the claims. Further, in each embodiment, the first seat frame connecting portion 41 (111, 131) is a specific example of the "first connecting portion" within the scope of the claims, and the second seat frame connecting portion 42 (112, 132) is a specific example of the "second connection portion" in the claims, and the third seat frame connection portion 43 (113, 133) is a specific example of the "third connection portion" in the claims. Is. Further, in the first embodiment, the fastening member 66 for fastening the first connecting member 61 to the first seat frame connecting portion 41 is a specific example of the "first fastening member" within the scope of the claims. The fastening member 66 that fastens the connecting member 62 of 2 to the second seat frame connecting portion 42 is a specific example of the "second fastening member" within the scope of the claims, and the third connecting member 63 is the third seat. The fastening member 66 to be fastened to the frame connecting portion 43 is a specific example of the "third fastening member" in the claims.

Further, the present invention can be appropriately modified within the scope of the claims and within the scope not contrary to the gist or idea of the invention which can be read from the entire specification, and the body frame of the saddle-type vehicle accompanied by such a modification is also the present invention. It is included in the technical idea of the invention.

1 Saddle-type vehicle 11, 101, 121 Body frame 13 Upper tank rail 14 Lower tank rail 21 Body frame 26 Upper connection part 26A Upper surface 41, 111, 131 First seat frame connection part (first connection part)
42, 112, 132 Second seat frame connection (second connection)
43, 113, 133 Third seat frame connection (third connection)
44 Fastening holes 51, 105, 127 Seat frame structure 52 Upper left seat frame 53 Upper right seat frame 54 Lower left seat frame 55 Lower right seat frame 56 First bridge 57 Left connecting frame 58 Right connecting frame 59 Second bridge 61 First Connection member 62 Second connection member 63 Third connection member 66 Fastening member 84 Engine 92 Fuel tank 93 Operation seat 103, 123 Tank rail 103A Top surface

Claims (7)

It is the body frame of a saddle-type vehicle,
With the head pipe,
A pair of tank rails whose front end is connected to the head pipe and whose rear end extends rearward on the upper left side and the upper right side of the engine, respectively.
A body frame located behind the engine and to which the rear ends of the pair of tank rails are connected, respectively.
It has a seat frame structure that supports a driver's seat located behind the fuel tank located above the engine.
The seat frame structure includes an upper left seat frame, an upper right seat frame, a lower left seat frame, a lower right seat frame, and a bridge.
The body frame has a first connection portion arranged on the left front side in the upper part of the body frame, a second connection portion arranged on the right front side in the upper part of the body frame, and an upper portion of the body frame. In the side view of the saddle-type vehicle, the first connection portion and the second connection portion are arranged behind and below the second connection portion, and the first connection portion and the second connection portion are arranged in the left-right direction. Has a third connection located between and
The front end portion of the upper left seat frame is connected to the first connection portion, and the rear end side of the upper left seat frame extends rearwardly on the rear left side of the engine.
The front end portion of the upper right seat frame is connected to the second connection portion, and the rear end side of the upper right seat frame extends rearwardly on the rear right side of the engine.
The front end portion of the lower left seat frame is connected to the third connection portion, the lower left seat frame extends rearward while inclining to the left from the third connection portion, and the rear end portion of the lower left seat frame is formed. It is connected to the rear end side of the upper left seat frame and
The front end portion of the lower right seat frame is connected to the third connection portion, and the lower right seat frame extends rearward while inclining to the right from the third connection portion, and is rear of the lower right seat frame. The end is connected to the rear end side of the upper right seat frame,
The bridge is a body frame of a saddle-mounted vehicle, characterized in that the rear end side of the upper left seat frame and the rear end side of the upper right seat frame are connected. It is the body frame of a saddle-type vehicle,
With the head pipe,
A tank rail whose front end is connected to the head pipe and whose rear end extends rearward between the engine and the fuel tank located above the engine.
It is provided with a seat frame structure that supports an operation seat arranged behind the fuel tank.
The seat frame structure includes an upper left seat frame, an upper right seat frame, a lower left seat frame, a lower right seat frame, and a bridge.
The tank rail includes a first connecting portion arranged in the left front side of definitive to the rear upper side of the tank rail, and a second connecting portion disposed in the front right side of the rear upper of the tank rails, of the tank rails On the upper rear side, the first connection portion and the first connection portion are arranged behind and below the first connection portion and the second connection portion in the side view of the saddle-mounted vehicle, and in the left-right direction, the first connection portion and the first connection portion. It has a third connection located between the two connections and
The front end portion of the upper left seat frame is connected to the first connection portion, and the rear end side of the upper left seat frame extends rearwardly on the rear left side of the engine.
The front end portion of the upper right seat frame is connected to the second connection portion, and the rear end side of the upper right seat frame extends rearwardly on the rear right side of the engine.
The front end portion of the lower left seat frame is connected to the third connection portion, the lower left seat frame extends rearward while inclining to the left from the third connection portion, and the rear end portion of the lower left seat frame is formed. It is connected to the rear end side of the upper left seat frame and
The front end portion of the lower right seat frame is connected to the third connection portion, and the lower right seat frame extends rearward while inclining to the right from the third connection portion, and is rear of the lower right seat frame. The end is connected to the rear end side of the upper right seat frame,
The bridge is a body frame of a saddle-mounted vehicle, characterized in that it connects between the rear end side of the upper left seat frame and the rear end side of the upper right seat frame. The first connection portion, the second connection portion, and the third connection portion are provided on the upper surface of the body frame, and the front end portion of the upper left seat frame is attached to the first connection portion of the upper left seat frame. The first fastening member is fixed by tightening the first fastening member from above the front end portion, and the front end portion of the upper right seat frame is fastened to the second connecting portion by tightening the second fastening member from above the front end portion of the upper right seat frame. The front end of the lower left seat frame and the front end of the lower right seat frame are connected to the third connection portion from above the front end of the lower left seat frame and the front end of the lower right seat frame. The body frame of a saddle-mounted vehicle according to claim 1, wherein the fastening member is fixed by tightening the fastening member. The claim is characterized in that the front end portion of the lower left seat frame and the front end portion of the lower right seat frame are respectively joined to a connecting member so as to be close to each other, and the connecting member is connected to the third connecting portion. The body frame of the saddle-mounted vehicle according to item 1 or 2. The rear end of the lower left seat frame is connected to the rear end of the upper left seat frame.
The rear end of the lower right seat frame is connected to the rear end of the upper right seat frame.
The bridge connects both the rear end of the upper left seat frame and the rear end of the lower left seat frame with both the rear end of the upper right seat frame and the rear end of the lower right seat frame.
The lower left seat frame, the lower right seat frame, and the bridge have a connection portion between the front end portions of the lower left seat frame and the lower right seat frame and the third connection portion as a first apex, and the lower left seat frame. It is arranged in a triangular shape with the connection portion between the rear end portion of the seat frame and the bridge as the second vertex and the connection portion between the rear end portion of the lower right seat frame and the bridge as the third vertex. The body frame of the saddle-mounted vehicle according to any one of claims 1 to 3, wherein the frame thereof is characterized by the above. The seat frame structure further includes a left connecting frame and a right connecting frame, the front end portion of the left connecting frame being connected to the third connecting portion or the front end portion of the lower left seat frame, and rear of the left connecting frame. The end is connected to the portion of the upper left seat frame between the front and rear ends, and the front end of the right connecting frame is connected to the third connection or the front end of the lower right seat frame. The saddle-type vehicle according to any one of claims 1 to 5 , wherein the rear end portion of the right connecting frame is connected to a portion between the front end portion and the rear end portion of the upper right seat frame. Body frame. The body frame of a saddle-type vehicle according to claim 3, wherein the first connection portion, the second connection portion, and the third connection portion are arranged on the same plane.

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