JP2019034603A - Frame structure for saddle-riding type vehicle - Google Patents

Abstract

To achieve weight reduction of a frame structure and high accuracy of a position or direction of a stay for supporting a step.SOLUTION: The frame structure for saddle-riding type vehicle includes a body frame 21 with side frame parts (a left frame part 22, a right frame part 23) extending each of the left rear side and right rear side of an engine downward from the rear end of the tank rail. Each of the side frame parts is formed by connecting two metal plates 24, 25. The frame structure includes a step supporting structure 51 for supporting a step 96 and a fixing member 64 for fixing the step supporting structure 51 on the side frame part. The front end side of the fixing member 64 is fixed between the two metal plates 24, 25 of the side frame part. The step supporting structure 51 is installed on the rear end of the fixing member 64 by fastening a fastening member 68 into a fastening hole 66 formed at the rear end surface of the fixing member 64.SELECTED DRAWING: Figure 8

Description

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

  Generally, a frame structure that forms a skeleton of a saddle-ride type vehicle such as a motorcycle includes a head pipe, a pair of main frames, and a pair of seat frames. The head pipe is disposed on the front upper side of the saddle riding type vehicle, that is, on the front upper side of the engine. A steering shaft is supported on the head pipe. On the other hand, the pair of main frames extend rearward from the head pipe through the upper left side and upper right side of the engine, and then bend to extend downward on the left rear side and right rear side of the engine. These main frames support an engine. In addition, the front end portion of the swing arm is supported by a portion of the main frame that extends downward from the rear side of the engine. Further, seat frames are respectively connected to the rear upper side of the left and right main frames. Each seat frame extends rearward from the upper rear side of the main frame. A driving seat is supported on the upper side of the left and right seat frames. Further, steps on which the driver sitting on the driver's seat puts his / her feet on are attached to the lower ends of the left and right main frames extending downward from the rear side of the engine via a stay.

  Here, paying attention to the stay for attaching the step, a stay fixing portion for fixing the stay to the main frame is provided at the lower end portion of the portion of the main frame that extends downward from the rear side of the engine. ing. The front end portion of the stay is fastened to the stay fixing portion using a bolt or the like. The rear end side of the stay extends rearward from the stay fixing portion, and the base end portion of the step is supported on the rear end portion of the stay.

  The general fastening structure of the stay to the stay fixing part is as follows. That is, a fastening hole in which a screw is formed on the inner peripheral surface is formed on the outer side surface of the stay fixing portion (the left surface of the left stay fixing portion or the right surface of the right stay fixing portion). Further, a through hole is formed in the front end portion of the stay so as to penetrate the portion in the left-right direction of the saddle riding type vehicle. The front end portion of the stay is fastened to the stay fixing portion by passing a bolt through the through hole of the stay and fastening the bolt to the fastening hole of the stay fixing portion.

  As described above, a general fastening structure of the stay to the stay fixing portion is a structure in which the front end portion of the stay is fastened to the stay fixing portion in the lateral direction of the saddle riding type vehicle. On the other hand, Patent Document 1 below describes a structure in which a stay for a pinion step is attached to a rear frame, and a structure in which the stay is fastened to the rear frame in a direction intersecting with the lateral direction of the saddle riding type vehicle is described. ing. That is, in Patent Document 1, a fastening bolt is inserted into an insertion hole formed in a front and rear frame side boss portion of a stay mounting portion of a rear frame, and the fastening bolt is formed on a front and rear boss portion of a front and rear beam portion of the stay. A structure is described in which the stay is fastened to the rear frame by being screwed into the screw hole and tightened. In this structure, the insertion hole on the rear frame side and the screw hole on the stay side are formed in the direction intersecting with the lateral direction of the saddle riding type vehicle, and the fastening bolt passes through the insertion hole in the direction intersecting with the lateral direction of the saddle riding type vehicle. It is fastened to the screw hole.

Japanese Patent No. 5178248

  By the way, the applicant of the present application has developed a new frame structure in order to reduce the weight of the frame structure of the saddle riding type vehicle. The new frame structure includes a head pipe disposed at the front upper part of the engine, a tank rail extending rearward from the head pipe to the upper side of the engine, and a left rear side and a right rear side of the engine from the rear end side of the tank rail. A body frame having a pair of side frame portions extending downward, and a seat frame extending rearward from the upper portion of the body frame.

  The body frame of this frame structure has the following new configuration. That is, each side frame part of the body frame includes an inner metal plate disposed on the inner side in the left-right direction of the saddle riding type vehicle and an outer metal plate arranged on the outer side in the left and right direction of the saddle riding type vehicle. The straddle-type vehicle is formed by joining the surface facing the outer side in the left-right direction and the surface of the outer metal plate facing the inner side in the left-right direction so as to face each other.

  In the body frame having such a configuration, there are the following problems in fixing the stay supporting the step where the driver puts his / her foot on the side frame portion.

  That is, when the stay is fixed to the surface facing the outer side in the lateral direction of the saddle riding type vehicle in the outer metal plate forming the side frame portion, the outer metal plate may be deformed by a load acting on the step. is there.

  Further, when the stay is fixed to the end surface facing the rear side of the side frame portion, it is difficult to increase the accuracy of the stay position or orientation. That is, there is a welded portion that joins the outer metal plate and the inner metal plate to the end surface facing the rear of the side frame portion. If the stay is fixed on the welded part with irregularities, it is not easy to increase the accuracy of the stay position or orientation, and a special jig or additional tool is added to increase the accuracy of the stay position or orientation. Need to be processed. Moreover, the dimension of the left-right direction of the end surface which faced the back of the side frame part is small, and it is difficult to ensure the area | region for fixing a stay avoiding a welding part.

  The present invention has been made in view of the above-described problems, for example, and a first object of the present invention is to reduce the weight of the frame structure of the saddle riding type vehicle. A second object of the present invention is to increase the accuracy of the position or orientation of the stay when the stay for supporting the step is fixed to the body frame having the novel frame structure.

  In order to solve the above-described problems, a frame structure of the present invention is a frame structure of a saddle-ride type vehicle, and includes a head pipe disposed in front and above an engine of the saddle-ride type vehicle, and the engine from the head pipe. A tank rail that extends rearward on the upper side of the tank, a body frame that has a pair of side frame portions that extend downward from the rear end side of the tank rail downward on the left rear side and the right rear side of the engine, and the saddle type A pair of step support structures that respectively support a pair of steps in which a driver of the vehicle hangs a left foot and a right foot, and a plurality of fixing members for fixing the pair of step support structures to the pair of side frame portions, respectively. Each side frame portion includes an inner metal plate disposed on the inner side in the left-right direction of the straddle-type vehicle and the left-right direction of the straddle-type vehicle. An outer metal plate disposed on a side of the inner metal plate and a surface facing the outer side in the left-right direction of the straddle-type vehicle, and a surface facing the inner side in the left-right direction of the straddle-type vehicle in the outer metal plate. It is formed by joining so as to face each other, and a fastening hole is formed in a rear end surface of each fixing member, and each fixing member has a front end side of the fixing member and the inner metal plate of the side frame portion. It is located between the outer metal plate, and the rear end portion of the fixing member is located on the side frame portion so that it protrudes between the inner metal plate and the outer metal plate of the side frame portion to the rear side thereof. Each of the step support structures is fixed, and includes a stay portion to which the step is attached to a rear end side, and an attachment portion for attaching a front end portion of the stay portion to a rear end portion of the fixing member, Step A through-hole penetrating in the front-rear direction of the saddle-ride type vehicle is formed in the attachment portion of the support structure, and each step support structure is fastened to the fastening hole through the through-hole from the rear of the attachment portion. The fastening member is attached to the rear end portion of the fixing member.

  According to the present invention, the frame structure of the saddle riding type vehicle can be reduced in weight. In addition, according to the present invention, the accuracy of the position or orientation of the stay can be increased when fixing the stay for supporting the step to the body frame of the frame structure.

1 is an external view showing a straddle-type vehicle having a frame structure according to an embodiment of the present invention. It is the external view which looked at the frame structure of the Example of this invention from the left. It is the external view which looked at the frame structure of the Example of this invention from upper direction. It is the external view which looked at the body frame, the step, and the step support structure from the left rear in the frame structure of the Example of this invention. It is explanatory drawing which shows the state which decomposed | disassembled the body frame in the frame structure of the Example of this invention. It is the external view which looked at the body frame in the frame structure of the Example of this invention from the left. It is sectional drawing which shows the left flame | frame part of the body frame seen from the arrow VII-VII direction in FIG. It is explanatory drawing which shows the state which isolate | separated the body frame, the stay, and the stay attachment member in the frame structure of the Example of this invention, respectively. It is explanatory drawing which shows the fixing member, stay attachment member, and 1st fastening member in the frame structure of the Example of this invention. It is explanatory drawing which shows the other Example of the frame structure of this invention.

  A frame structure according to an embodiment of the present invention includes a head pipe disposed at an upper front side of an engine of a saddle riding type vehicle, a tank rail extending rearward from the head pipe to the upper side of the engine, and an engine from a rear end side of the tank rail. And a body frame having a pair of side frame portions that extend downward on the left rear side and the right rear side, respectively.

  In the body frame, each side frame portion straddles an inner metal plate arranged on the inner side in the left-right direction of the saddle riding type vehicle and an outer metal plate arranged on the outer side in the left and right direction of the saddle riding type vehicle in the inner metal plate. It is formed by joining the surface facing the outer side in the left-right direction of the type vehicle and the surface facing the inner side in the left-right direction of the saddle riding type vehicle on the outer metal plate.

  Furthermore, the frame structure of the embodiment of the present invention includes a pair of step support structures that respectively support a pair of steps in which the driver of the saddle riding type vehicle applies the left foot and the right foot, and the pair of step support structures as a pair of side frames. And a plurality of fixing members for fixing to the respective parts.

  A fastening hole is formed in the rear end surface of each fixing member. Each fixing member has a front end side of the fixing member positioned between the inner metal plate and the outer metal plate of the side frame portion, and a rear end portion of the fixing member is outer side of the inner metal plate of the side frame portion. It is being fixed to the said side frame part so that it may come out behind these between metal plates.

  Each step support structure has a stay part to which the step is attached on the rear end side, and an attachment part for attaching the front end part of the stay part to the rear end part of the fixing member. A through-hole penetrating in the front-rear direction of the saddle riding type vehicle is formed in the attachment portion of each step support structure. Each step support structure is attached to the rear end portion of the fixing member by a fastening member fastened to the fastening hole through the through hole from the rear of the attachment portion.

  According to the frame structure of the embodiment of the present invention, since each side frame portion of the body frame is formed by joining two metal plates, the body frame can be reduced in weight.

  Further, since the front end portion of the fixing member is arranged between the two metal plates forming the side frame portion, the front end portion of the fixing member is avoided by avoiding the welded portion that joins the inner metal plate and the outer metal plate. Can be arranged. Thereby, a fixing member can be fixed to a side frame part with sufficient accuracy.

  Further, the fastening member is fastened from the rear of the attachment portion of the step support structure to the fastening hole formed in the rear end surface of the fixing member through the through hole penetrating the attachment portion in the front-rear direction. Therefore, it is possible to make it difficult for the load acting on the step to act in the direction of loosening the fastening member (for example, the direction rotating counterclockwise around the axis of the fastening member). Therefore, it is possible to suppress the fastening member from loosening due to the load acting on the step.

(Saddle-ride type vehicle)
FIG. 1 shows a saddle riding type vehicle 1 provided with a frame structure 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, shape, etc. of the components. 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 straddle-type vehicle 1 includes a frame structure 11 that forms a skeleton thereof. A steering shaft 81 is supported on the front portion of the frame structure 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. An engine 84 is supported at a substantially intermediate portion in the front-rear direction of the frame structure 11. The engine 84 includes a crankcase 85, a cylinder 86, and a cylinder head 87. A muffler 88 is provided below the engine 84. The exhaust port provided at the front portion of the cylinder head 87 and the muffler 88 are connected by an exhaust pipe 89. A front end portion of the swing arm 90 is supported on the lower rear side of the frame structure 11, and a rear wheel 91 is supported on the rear end side of the swing arm 90. A fuel tank 92 is provided above the frame structure 11, and an operation seat 93 is provided behind the fuel tank 92.

(Frame structure)
2 shows a state in which the frame structure 11 is viewed from the left, and FIG. 3 shows a state in which the frame structure 11 is viewed from above. 2 and 3, the frame structure 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 frames 17, a body frame 21, and a seat. A frame structure 41, a pair of step support structures 51, and a plurality of fixing members 64 are provided.

  The head pipe 12 is a cylindrical member formed of a metal such as steel, for example, and is disposed at the front upper portion of the saddle riding type vehicle 1, that is, the front upper side 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 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 and their rear end portions extending rearward while inclining the upper left and upper right sides 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 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 increase from each other as they extend rearward in the plan view and beyond the cylinder head 87 of the engine 84. 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, respectively, and rear end portions extending rearward while inclining the upper left and upper right sides of the engine 84 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. 2, the pair of down tubes 15 have their front end portions connected to the front end sides of the pair of lower tank rails 14, respectively, and the rear end sides extending downward while slightly tilting backward. A first engine mount 71 is provided at the lower end 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 left first engine mount portion 71. 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.

  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 frame structure 11. A reinforcing frame 17 is also provided between a portion of the lower tank rail 14 that is behind the portion to which the upper end of the down tube 15 is connected and the lower end of the down tube 15. Similarly, a plurality of reinforcing frames 17 are provided on the right side of the frame structure 11.

(Body frame)
FIG. 4 shows a state in which the body frame 21, the step 96, and the step support structure 51 are viewed from the left rear. FIG. 5 shows a state in which the body frame 21 is disassembled. FIG. 6 shows the body frame 21 as viewed from the left. FIG. 7 shows a cross section of the left frame portion 22 of the body frame 21 as seen from the direction of arrows VII-VII in FIG.

  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 front end of the swing arm 90, a function of supporting the seat frame structure 41, And a frame having a function of fixing each step support structure 51 via a fixing member 64. As shown in FIG. 1, the body frame 21 is disposed on the rear side of the engine 84.

  As shown in FIG. 4, the body frame 21 includes a left frame portion 22 that extends downward from the rear end side of the left upper tank rail 13 and the lower tank rail 14 to the left rear side of the engine 84, and a right upper portion. A right frame portion 23 that extends downward from the right rear side of the engine 84 from the rear end side of each of the tank rail 13 and the lower tank rail 14, and an upper portion that connects the upper portion of the left frame portion 22 and the upper portion of the right frame portion 23. The connection part 26 and the lower connection part 27 which connects the lower part of the left frame part 22 and the lower part of the right frame part 23 are provided.

  As shown in FIG. 5, the left frame portion 22 is formed by joining an inner metal plate 24 and an outer metal plate 25 to each other. The inner metal plate 24 is disposed on the inner side in the left-right direction of the saddle riding type vehicle 1, and the outer metal plate 25 is disposed on the outer side in the left and right direction of the saddle riding type vehicle 1.

  The inner metal plate 24 and the outer metal plate 25 are each formed by pressing a metal plate. As shown in FIG. 7, the rear edge portion 24 </ b> A of the inner metal plate 24 is bent so that the end surface of the rear edge portion 24 </ b> A faces the outer side in the left-right direction of the saddle riding type vehicle 1. Similarly, the front edge portion 24B of the inner metal plate 24 is bent so that the end surface of the front edge portion 24B faces the outer side in the left-right direction of the saddle riding type vehicle 1. The rear edge portion 25 </ b> A of the outer metal plate 25 is bent so that the end surface of the rear edge portion 25 </ b> A faces the inner side in the left-right direction of the saddle riding type vehicle 1. Similarly, the front edge portion 25B of the outer metal plate 25 is also bent so that the end surface of the front edge portion 25B faces the inner side in the left-right direction of the saddle riding type vehicle 1.

  As shown in FIGS. 5 and 7, the left frame portion 22 includes an inner metal plate 24 and an outer metal plate 25, and a surface 24 </ b> C facing the outer side in the left-right direction of the saddle riding type vehicle 1 on the inner metal plate 24. The plate 25 is formed by joining the saddle-type vehicle 1 so that the surface 25C facing the inner side in the left-right direction faces each other. Specifically, the left frame portion 22 aligns the end surface of the rear edge portion 24 </ b> A of the inner metal plate 24 with the end surface of the rear edge portion 25 </ b> A of the outer metal plate 25 and the front edge portion 24 </ b> B of the inner metal plate 24. The end surface and the end surface of the front edge portion 25B of the outer metal plate 25 are aligned with each other, the rear edge portion 24A and the rear edge portion 25A are welded, and the front edge portion 24B and the front edge portion 25B are welded. ing. Thereby, as shown in FIG. 7, the left frame part 22 is formed in the cylinder shape which has a substantially rectangular cross section.

  As shown in FIG. 5, two cutout portions 35 are formed on the end surface of the rear edge portion 24 </ b> A in the inner metal plate 24 of the left frame portion 22. The two notches 35 are respectively disposed on the upper and lower portions of the end face of the rear edge 24A. In addition, two cutout portions 36 are formed on the end surface of the rear edge portion 25 </ b> A in the outer metal plate 25 of the left frame portion 22. The two notches 36 are respectively arranged on the upper and lower portions of the end surface of the rear edge 25A. The upper notch 35 of the inner metal plate 24 and the upper notch 36 of the outer metal plate 25 are arranged at positions facing each other. Further, the lower notch 35 of the inner metal plate 24 and the lower notch 36 of the outer metal plate 25 are arranged at positions facing each other. When the inner metal plate 24 and the outer metal plate 25 are joined to each other, the upper notch portion 35 and the upper notch portion 36 are combined, and the lower notch portion 35 and the lower notch portion 36 are aligned. As a result, two holes are formed in the rear surface of the left frame portion 22.

  Further, the front end sides of the two fixing members 64 are fitted between the upper notch portion 35 and the upper notch portion 36 and between the lower notch portion 35 and the lower notch portion 36, respectively. Is done. When the left frame portion 22 is viewed from the rear, the shape of each of the cutout portions 35 and 36 has a semicircular shape so as to match the circular cross-sectional shape of the front end side of the fixing member 64.

  The right frame portion 23 has a symmetrical structure with the left frame portion 22 and is formed by joining an inner metal plate 24 and an outer metal plate 25 to each other in the same manner as the left frame portion 22. Similarly to the left frame portion 22, two cutout portions 35 are formed on the end surface of the rear edge portion 24 </ b> A of the inner metal plate 24 in the right frame portion 23, and the rear edge of the outer metal plate 25 in the right frame portion 23. Two notches 36 are also formed on the end face of the portion 25A.

  Each of the upper connecting portion 26 and the lower connecting portion 27 is 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 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.

  As shown in FIG. 2, two tank rail connecting portions 28 are provided on the front upper left side of the body frame 21. Among these tank rail connecting portions 28, the rear end portion of the left upper tank rail 13 is connected to the upper tank rail connecting portion 28, and the rear side of the left lower tank rail 14 is connected to the lower tank rail connecting portion 28. The ends are connected. 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. Among these tank rail connecting portions 28, the upper tank rail connecting portion 28 is connected to the rear end portion of the right upper tank rail 13, and the lower tank rail connecting portion 28 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 28 are formed in a portion where the outer metal plate 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 metal plate 25, respectively. Similarly, the two right tank rail connecting portions 28 are formed in a portion where the outer metal plate 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. The rear end portions of the upper and lower metal plates are welded to the upper connecting portion 26 and the outer metal plate 25, respectively.

  Further, as shown in FIG. 2, a second engine mount portion 72 is provided at a lower portion of the body frame 21 on the upper left front side than the lower left tank rail connection portion 28. Similarly, a second engine mount portion 72 is also provided at a portion below the lower right tank rail connection portion 28 on the front upper right portion of the body frame 21. Each second engine mount portion 72 is integrally formed with the upper coupling portion 26. On each second engine mount 72, 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.

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

    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 90 is rotatably supported.

  Further, as shown in FIG. 4, 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 94 is connected to the rear cushion connection 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. 5, three seat frame connecting portions 37, 38 for connecting the seat frame structure 41 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. , 39 are provided. The seat frame connecting portion 37 is disposed on the left front side on the upper surface of the upper connecting portion 26. The seat frame connecting portion 38 is disposed on the right front side on the upper surface of the upper connecting portion 26. The seat frame connecting portion 39 is disposed in the middle in the left-right direction and on the rear side on the upper surface of the upper connecting portion 26. Each seat frame connecting portion 37, 38, 39 is formed with a bolt hole 40 having a screw formed on the inner peripheral surface thereof.

(Seat frame structure)
The seat frame structure 41 is a frame structure that mainly supports the operation seat 93. As shown in FIGS. 2 and 3, the seat frame structure 41 includes a pair of upper seat frames 42, a pair of lower seat frames 43, a first bridge 44, a pair of connecting frames 45, and a second bridge. 46. These frames and bridge portions are formed by metal pipes.

  The front end portion of the left upper seat frame 42 is connected to a seat frame connecting portion 37 provided on the upper surface of the body frame 21 via a connecting member 47. Specifically, the connecting member 47 is joined to the front end portion of the left upper seat frame 42 by, for example, welding. The front end portion of the left upper seat frame 42 is connected to the seat frame by passing a bolt through a through hole formed in the connection member 47 and fastening the bolt into a bolt hole 40 formed in the seat frame connection portion 37. Connected to the unit 37. Similarly, the front end portion of the right upper seat frame 42 is connected to a seat frame connecting portion 38 provided on the upper surface of the body frame 21 via a connecting member 48. Further, the rear end sides of the left and right upper seat frames 42 extend rearward while being inclined upward from the upper surface of the body frame 21. Further, the rear ends of the left and right upper seat frames 42 are connected by a first bridge 44.

  The front end portions of the pair of lower seat frames 43 are coupled by one connection member 49 and are connected to a seat frame connection portion 39 provided on the upper surface of the body frame 21 via the connection member 49. The rear end portion of the left lower seat frame 43 is connected to the rear end portion of the left upper seat frame 42, and the rear end portion of the right lower seat frame 43 is connected to the rear end portion of the right upper seat frame 42. Has been.

  The front end portion of the left connecting frame 45 is connected to the front end portion of the left lower seat frame 43, and the rear end portion is connected to a substantially middle portion in the front-rear direction of the left upper seat frame 42. The right connection frame 46 has a front end connected to a front end of the right lower seat frame 43 and a rear end connected to a substantially middle portion in the front-rear direction of the right upper seat frame 42. Further, the second bridge 46 connects the portion of the left upper seat frame 42 to which the left connecting frame 45 is connected and the portion of the right upper seat frame 42 to which the right connecting frame 45 is connected. ing.

(Fixing member / step support structure)
FIG. 8 shows a state in which the body frame 21, the stay 52, and the stay attaching member 56 are separated from each other. In FIG. 8, for convenience of explanation, only the left stay 52 and the stay mounting member 56 are shown. FIG. 9 shows the fixing member 64, the stay attaching member 56, and the first fastening member 68.

  In the frame structure 11, the pair of step support structures 51 are structures that respectively support a pair of steps 96 on which the driver of the saddle riding type vehicle 1 hangs the left foot and the right foot. The plurality of fixing members 64 are members for fixing the pair of step support structures 51 to the left frame portion 22 and the right frame portion 23 of the body frame 21, respectively.

  As shown in FIG. 8, each fixing member 64 is formed in a cylindrical shape from a metal such as steel or aluminum. As shown in FIG. 9, a pedestal portion 65 for attaching the stay attaching member 56 of the step support structure 51 is formed at the rear end portion of each fixing member 64. The pedestal portion 65 has a larger diameter than other portions of the fixing members 64. Further, a seating surface 65A for contacting the stay mounting member 56 is formed on the rear end surface of each fixing member 64, that is, the rear end surface of the pedestal portion 65. Further, a fastening hole 66 for fastening the first fastening member 68 for fastening the stay attaching member 56 is formed in the central portion of the seating surface 65A. A screw is formed on the inner peripheral surface of the fastening hole 66. In this embodiment, the fastening hole 66 penetrates the fixing member 64 in the axial direction.

  As shown in FIG. 8, in this embodiment, four fixing members 64 are fixed to the rear part of the body frame 21. That is, the two fixing members 64 are respectively fixed to the upper part and the lower part of the rear surface of the left frame part 22, and the other two fixing members 64 are respectively fixed to the upper part and the lower part of the rear surface of the right frame part 23.

  As can be seen from FIG. 5, FIG. 7 and FIG. 8 together, the front end side of each fixing member 64 on the left side has a notch 35 formed on the inner metal plate 24 of the left frame portion 22 of the body frame 21, It arrange | positions between the notch parts 36 formed in the outer side metal plate 25, and is fitting to these notch parts 35 and the notch part 36, respectively. Each of the left fixing members 64 is welded to, for example, the notch portion 35 and the notch portion 36, thereby being fixed to the left frame portion 22. Further, the rear end portion of each left fixing member 64 protrudes from between the inner metal plate 24 and the outer metal plate 25 of the left frame portion 22 to the rear side thereof, and the pedestal portion of each left fixing member 64. 65 is located behind the rear surface of the left frame portion 22.

  The right fixing members 64 are also fixed to the right frame portion 23 in the same manner as the left fixing members 64, and the pedestal portions 65 of the right fixing members 64 are positioned behind the rear surface of the right frame portion 23. doing.

  On the other hand, each step support structure 51 has a stay 52 and a stay mounting member 56 as shown in FIG. The stay 52 is a member for supporting the step 96. In the present embodiment, the stay 52 is formed in a V shape from a metal such as aluminum. That is, the stay 52 has two beam portions 53, the rear end portions of the beam portions 53 are connected to each other, and the front end portions of the beam portions 53 are separated from each other in the vertical direction. Further, the base end portion of step 96 is fixed to the rear end portion of the stay 52. Further, a heel guard 54 is provided on the rear upper side of the upper beam portion 53. Further, an insertion hole 55 is formed at the front end portion of each beam portion 53 so as to penetrate the portion in the left-right direction.

  The stay attaching member 56 is a member for attaching the front end portion of the stay 52 to the rear end portion of the fixing member 64. The stay attachment member 56 is formed in a substantially rectangular parallelepiped shape, for example, from aluminum, and is formed by, for example, casting. As shown in FIG. 9, an insertion hole 57, a through hole 58, and a mounting hole 59 are sequentially formed on the upper portion of the stay mounting member 56 in the front-rear direction of the saddle riding type vehicle 1 from the rear portion toward the front portion. It is formed coaxially. The insertion hole 57 is a large-diameter hole into which a tool for tightening the head of the first fastening member 68 and the first fastening member 68 can be inserted. The through hole 58 is a small diameter hole through which the shaft portion of the first fastening member 68 passes. The attachment hole 59 is a large-diameter hole into which the pedestal portion 65 of the fixing member 64 can be inserted. Similarly, an insertion hole 57, a through hole 58, and a mounting hole 59 are also formed in the lower portion of the stay mounting member 56.

  The left stay attaching member 56 is attached to the two fixing members 64 fixed to the left frame portion 22 using, for example, two first fastening members 68 such as bolts as follows. That is, as shown in FIG. 8 or FIG. 9, first, the base portions 65 of the two fixing members 64 fixed to the left frame portion 22 are inserted into the upper and lower mounting holes 59 of the left stay mounting member 56. To do. Next, one of the two first fastening members 68 is sequentially passed from the rear of the stay mounting member 56 through the insertion hole 57 and the through hole 58 on the upper side of the stay mounting member 56, so that the first fastening is performed. The screw portion of the member 68 is screwed into the fastening hole 66 of the fixing member 64 inserted into the upper mounting hole 59. Similarly, the other one of the two first fastening members 68 is sequentially passed from the rear of the stay mounting member 56 through the insertion hole 57 and the through hole 58 on the lower side of the stay mounting member 56, and the first The screw portion of one fastening member 68 is screwed into the fastening hole 66 of the fixing member 64 inserted into the lower mounting hole 59. Then, these two first fastening members 68 are fastened to the fastening holes 66, respectively. On the other hand, the right stay attaching member 56 is also attached to the two fixing members 64 fixed to the right frame portion 23 in the same manner as the left stay attaching member 56.

  Further, as shown in FIG. 9, a stay connecting portion 60 for connecting the front end portion of the beam portion 53 on the upper side of the stay 52 is formed at the upper end portion of the stay attaching member 56. A stay connecting portion 60 for connecting the front end portion of the lower beam portion 53 of the stay 52 is formed at the lower portion of the stay mounting member 56. Each stay connection portion 60 is formed with a plurality of connection holes 61 that penetrate the stay connection portion 60 in the left-right direction of the saddle riding type vehicle 1. Further, a screw is formed on the inner peripheral surface of each connection hole 61. In the present embodiment, when the saddle riding type vehicle 1 is viewed from the side, the six stay holes 61 are arranged in a matrix of two columns and three rows in the upper stay connection portion 60. Also, the same number of connection holes 61 as the upper stay connection portion 60 are arranged in the same arrangement as the upper stay connection portion 60 in the lower stay connection portion 60.

  The left stay 52 is connected to the left surface of the stay connecting portion 60 of the left stay mounting member 56 by using two second fastening members 69 such as bolts. Specifically, the front end portion of the upper beam portion 53 of the left stay 52 passes the second fastening member 69 through the insertion hole 55 of the upper beam portion 53, and the screw portion of the second fastening member 69 is inserted. The upper stay connection portion 60 is connected to the left surface of the upper stay connection portion 60 by being fastened to one of the six connection holes 61 formed in the upper stay connection portion 60. In addition, the front end portion of the lower beam portion 53 on the left stay 52 passes the second fastening member 69 through the insertion hole 55 of the lower beam portion 53 and lowers the thread portion of the second fastening member 69. The lower stay connection portion 60 is connected to the left surface of the lower stay connection portion 60 by fastening to one of the six connection holes 61 formed in the side stay connection portion 60. Similarly, the right stay 52 is connected to the right surface of the upper and lower stay connecting portions 60 of the right stay mounting member 56 using two second fastening members 69.

  As described above, in the frame structure 11 of the embodiment of the present invention, each of the left frame portion 22 and the right frame portion 23 of the body frame 21 is formed by joining two metal plates formed by pressing. did. Thereby, the body frame 21 can be reduced in weight.

  In the frame structure 11 of the present embodiment, a plurality of fixing members 64 for attaching the left and right step support structures 51 to the left frame portion 22 and the right frame portion 23 are provided, and the front end sides of the respective fixing members 64 are provided. The left frame portion 22 or the right frame portion 23 is disposed between the inner metal plate 24 and the outer metal plate 25. Thereby, the fixing member 64 can be arranged avoiding the welded portion that joins the rear edge portion 24A of the inner metal plate 24 and the rear edge portion 25A of the outer metal plate 25. Thereby, each fixing member 64 can be fixed to the left frame part 22 or the right frame part 23 with high accuracy. If the fixing member 64 is fixed on the welded portion between the rear edge 24A of the inner metal plate 24 and the rear edge 25A of the outer metal plate 25 by welding, the rear edge 24A of the inner metal plate 24 and Since the surface of the welded portion with the rear edge portion 25A of the outer metal plate 25 is not flat, when fixing the fixing member 64, a special jig for fixing the position or orientation of the fixing member 64 with high accuracy (for example, fixing) A tool for temporarily fixing the member 64), or a part of the welded portion between the rear edge portion 24A of the inner metal plate 24 and the rear edge portion 25A of the outer metal plate 25 is cut and flattened to fix the member. The process which forms the seat surface for arrange | positioning 64 is needed. According to the frame structure 11 of the embodiment of the present invention, the accuracy of the position or orientation of the fixing member 64 can be easily increased without using such a special jig or performing additional processing.

  Further, the front end side of each fixing member 64 is disposed between the inner metal plate 24 and the outer metal plate 25, and the fixing member 64 is formed with a fastening hole 66 penetrating the member in the front-rear direction. The threaded portion of one fastening member 68 can be fastened through the fixing member 64. Therefore, a fastening member having a long threaded portion can be used as the first fastening member 68, whereby the stay attaching member 56 can be reliably attached to the rear end portion of the fixing member 64. That is, in the state where the front end side of the fixing member 64 is disposed between the inner metal plate 24 and the outer metal plate 25, the fastening hole 66 of the fixing member 64 is formed with the inner metal plate 24 and the outer metal plate as shown in FIG. Pass between 25. Therefore, when the first fastening member 68 is screwed into the fastening hole 66, the front end side of the screw portion of the first fastening member 68 is between the inner metal plate 24 and the outer metal plate 25 from the front end surface of the fixing member 64. Can protrude into the space. Therefore, a fastening member having a long thread portion can be used as the first fastening member 68 for attaching the stay attaching member 56 to the rear end portion of the fixing member 64.

  Further, in the frame structure 11 of the present embodiment, the front end side of each fixing member 64 is arranged on the end surface of the rear edge portion 24A of the inner metal plate 24 that forms the left frame portion 22 or the right frame portion 23 and the rear surface of the outer metal plate 25. It was set as the structure fitted to the notch part 35 and the notch part 36 which were each formed in the end surface of 25 A of edge parts. Thereby, since the position with respect to the left frame part 22 or the right frame part 23 of the fixing member 64 is determined accurately, the fixing member 64 can be positioned with high accuracy.

  Further, in the frame structure 11 of the present embodiment, the first fastening member 68 is passed from the rear of the stay mounting member 56 through the through hole 58 penetrating the stay mounting member 56 in the front-rear direction (the rear end surface of the fixing member 64 ( The stay attaching member 56 is attached to the fixing member 64 by being fastened to a fastening hole 66 formed in the seating surface 65A). Thereby, it is possible to suppress the first fastening member 68 from being loosened by the load acting on the step 96. That is, when the first fastening member 68 is a normal bolt or the like, the first fastening member 68 is slackened when a load is applied to the first fastening member 68 in a direction in which the first fastening member 68 rotates counterclockwise around its axis. It becomes easy. In this regard, in the frame structure 11 according to the embodiment of the present invention, when a load acts on the step 96, the load acts in a direction of pushing the axis of the first fastening member 68 extending in the front-rear direction downward. That is, the load does not act in a direction that rotates counterclockwise around the axis of the first fastening member 68. Therefore, the first fastening member 68 can be prevented from being loosened by the load acting on the step 96.

  Further, since the step support structure 51 is attached to the rear surfaces of the left frame portion 22 and the right frame portion 23 via the fixing member 64, the step support structure 51 and the step support structure 51 are attached to the left frame portion 22 or the right frame portion. A fastening member or the like for attaching to the vehicle 23 does not protrude or protrude outward in the left-right direction of the saddle riding type vehicle 1. Therefore, the width of the saddle riding type vehicle 11 in the vicinity of the rear side of the engine 84 can be reduced.

  Further, in the frame structure 11 of the present embodiment, a pedestal portion 65 having a larger diameter than the other portion of the fixing member 64 is provided at the rear end portion of each fixing member 64, and the bottom surface of the mounting hole 59 of the stay mounting member 56. The stay attachment member 56 is attached to the rear end portion of the fixing member 64 in a state in which the stay attachment member 56 is in contact with the seating surface 65 </ b> A of the pedestal portion 65. According to this configuration, the area of the seat surface 65A can be increased by increasing the diameter of the pedestal portion 65, and the contact area between the stay mounting member 56 and the seat surface 65A of the fixing member 64 can be increased. Can do. Therefore, the stay attaching member 65 can be stably fixed to the rear end portion of the fixing member 64.

  Further, in the frame structure 11 of the present embodiment, a plurality of connection holes 61 that can connect the front end portions of the beam portions 53 of the stays 52 are formed in each stay connection portion 60 of the stay mounting member 56. The front end portion of the beam portion 53 of the stay 52 is connected to any one of them. As a result, a user (driver, maintenance worker, etc.) can connect the front end of the beam portion 53 above the stay 52 from among the plurality of connection holes 61 formed in the stay connection portion 60 above the stay mounting member 56. One connection hole 61 for connecting the portions is selected, and the front end portion of the beam portion 53 on the lower side of the stay 52 is selected from the plurality of connection holes 61 formed in the stay connection portion 60 on the lower side of the stay mounting member 56. The connection holes 61 are selected, and the front end portions of the upper and lower beam portions 53 of the stay 52 are connected to the selected connection holes 61, respectively, so that the position of the stay 52 with respect to the stay mounting member 56 is changed. It can be set arbitrarily. Thereby, the user can arbitrarily set the position of each step 96 in the saddle riding type vehicle 1. The user changes the connection hole 61 that connects the front end portion of the beam portion 53 of the stay 52 to another connection hole 61, for example, to shift each step 96 forward or backward, or upward or downward. The position of each step 96 can be adjusted so that the driver can easily drive.

  In the above-described embodiment, the case where the step support structure 51 includes the stay 52 and the stay attachment member 56 that are independent members is described as an example, but the present invention is not limited thereto. For example, like the step support structure 101 shown in FIG. 10, the stay portion 102 to which the step 96 is attached on the rear end side, and the stay attachment portion 103 for attaching the front end portion of the stay portion 102 to the rear end portion of the fixing member 64. May be integrally formed, for example, by casting aluminum.

  In the above-described embodiment, the connection members 47, 48 and 49 are welded to the front end portions of the upper seat frame 42 and the lower seat frame 43, respectively, and the front end portions of the upper seat frame 42 and the lower seat frame 43 are connected to each other. The case where it connects to the seat frame connection parts 37, 38 and 39 of the body frame 21 through the connection members 47, 48 and 49 is given as an example. However, the front end portions of the upper seat frame 42 and the lower seat frame 43 may be directly connected to the seat frame connecting portions 37, 38, and 39 without using the connecting members 47, 48, and 49. For example, a structure in which the upper seat frame 42 and the lower seat frame 43 can be bolted to the seat frame connecting portions 37, 38, and 39 may be integrally formed at the front end portions of the upper seat frame 42 and the lower seat frame 43.

  In the frame structure of the present invention, the number of tank rails and the number of fixing members are not limited. Further, in each of the above-described embodiments, the stay 52 (stay portion 101) is formed in a V shape, but the specific shape of the stay 52 (stay portion 101) is not limited. Further, the number and arrangement of the connection holes 61 formed in each stay connection portion 60 of the stay attachment member 56 are not limited to those shown as the embodiment. The present invention can also be applied to a straddle-type vehicle other than a motorcycle such as a motor tricycle or a buggy.

  In the above-described embodiment, the left frame portion 22 and the right frame portion 23 are specific examples of “side frame portions” in the claims. In addition, the stay 52 and the stay portion 102 are specific examples of “stay portions” in the claims, and the stay attachment member 56 and the stay attachment portion 103 are specific examples of “attachment portions” in the claims. . The first fastening member 68 is a specific example of the “fastening member” in the claims.

  Further, the present invention can be appropriately changed without departing from the gist or concept of the invention which can be read from the claims and the entire specification, and the frame structure of the saddle riding type vehicle with such a change is also described in the present invention. It is included in the technical idea of the invention.

1 straddle-type vehicle 11 frame structure 12 head pipe 13 upper tank rail 14 lower tank rail 21 body frame 22 left frame (side frame)
23 Right frame (side frame)
24 inner metal plate 25 outer metal plate 35, 36 notch portion 51 step support structure 52 stay (stay portion)
56 Stay mounting member (mounting part)
58 Through-hole 61 Connection hole 64 Fixing member 65 Base portion 65A Seat surface 66 Fastening hole 68 First fastening member 69 Second fastening member 84 Engine 93 Operation seat 96 Step 102 Stay portion 103 Stay attachment portion (attachment portion)

Claims (3)

A straddle-type vehicle frame structure,
A head pipe disposed above and in front of the engine of the saddle riding type vehicle;
A tank rail extending rearward from the head pipe on the upper side of the engine;
A body frame having a pair of side frame portions respectively extending downward from the rear rear side of the tank rail to the left rear side and the right rear side of the engine;
A pair of step support structures that respectively support a pair of steps in which the driver of the saddle riding type vehicle applies a left foot and a right foot;
A plurality of fixing members for fixing the pair of step support structures to the pair of side frame parts,
Each of the side frame portions includes an inner metal plate arranged on the inner side in the left-right direction of the saddle riding type vehicle and an outer metal plate arranged on the outer side in the left and right direction of the saddle riding type vehicle. Formed by joining the surface facing the laterally outer side of the riding type vehicle and the surface facing the inner side of the saddle riding type vehicle on the outer metal plate so as to face each other,
A fastening hole is formed in the rear end surface of each fixing member,
In each of the fixing members, the front end side of the fixing member is located between the inner metal plate and the outer metal plate of the side frame portion, and the rear end portion of the fixing member is the inner metal of the side frame portion. It is fixed to the side frame portion so as to come out from between the plate and the outer metal plate to the rear side thereof,
Each of the step support structures has a stay part to which the step is attached on the rear end side, and an attachment part for attaching the front end part of the stay part to the rear end part of the fixing member,
A through-hole penetrating in the front-rear direction of the saddle riding type vehicle is formed in the attachment portion of each step support structure,
Each of the step support structures is attached to the rear end portion of the fixing member by a fastening member that is fastened to the fastening hole from the rear of the attachment portion through the through hole.   In each of the side frame portions, the rear edge portion of the inner metal plate is bent so that the end surface of the rear edge portion of the inner metal plate faces the outer side in the left-right direction of the saddle riding type vehicle, and the rear edge portion of the outer metal plate The rear edge of the outer metal plate bends so that the end face of the saddle-type vehicle faces the inner side in the left-right direction, and the end face of the rear edge of the inner metal plate and the end face of the rear edge of the outer metal plate The frame structure according to claim 1, wherein notch portions are formed so as to face each other, and a front end side of the fixing member is fitted into these notch portions. In each step support structure, the stay portion and the attachment portion are formed as independent members,
A plurality of connection holes that can connect the front end portion of the stay portion are formed in the attachment portion,
The frame structure according to claim 1, wherein a front end portion of the stay portion is connected to at least one of the plurality of connection holes.

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