JP6761287B2 - Rear frame structure of saddle-mounted vehicle - Google Patents

Description

The present invention relates to a rear frame structure provided behind the main frame of a saddle-mounted vehicle.

As a rear frame structure of a body frame of a saddle-type vehicle, there is a rear frame structure having an upper frame extending rearward from the main frame and a lower frame extending diagonally upward rearward from the main frame and connected to the upper frame (for example). Patent Document 1).

Special Fairness 07-064299 Gazette

In the rear frame structure of Patent Document 1, the lower frame has a different extending direction between the connected portion and the non-connected portion with the upper frame, and a bent portion is formed between both portions. With such a rear frame structure, when the accessory parts are attached to the rear portion of the rear frame, that is, the connecting portion of the lower frame, a bending load in a direction orthogonal to the longitudinal direction of the connecting portion is applied to the bent portion. If a reinforcing member is provided in the bent portion in order to increase the strength of the folded portion, the weight of the rear frame structure increases.

An object of the present invention is to provide a highly rigid rear frame structure to which accessories can be attached while suppressing an increase in weight.

In order to achieve the above object, the rear frame structure of the present invention is a rear frame structure provided behind the main frame of a saddle-type vehicle, and includes a first frame member extending rearward from the main frame. A reinforcing member that protrudes downward from the first frame member and is joined to the first frame member at a joint portion that extends in the front-rear direction along the first frame member and an upward inclination toward the rear from the main frame. A second frame member that extends and is joined to the reinforcing member at the rear end surface is provided, and a mounting member for mounting an accessory component is provided on the lower surface of the reinforcing member. Here, the "accessory" refers to an option or accessory selectively added by the user, and includes, for example, a pannier, a top case, a U-shaped lock, a rear grip, and a dress guard.

According to this configuration, since the first frame member is reinforced by the second frame member and the reinforcing member, the rigidity of the rear frame structure is improved. Further, since the second frame member is joined to the reinforcing member at the rear end surface, it is possible to eliminate the bent portion in the second frame member. Therefore, even when the accessory parts are attached to the reinforcing member, a part of the load acts in the longitudinal direction of the inclined second frame member without concentrating the load in the vertical direction on the bent portion. Therefore, it is not necessary to reinforce the second frame member, and an increase in the weight of the rear frame structure can be suppressed. In this way, while suppressing the increase in weight of the rear frame structure, it is possible to secure high rigidity of the rear frame structure and stably attach the accessory parts. Further, since the mounting member is provided on the lower surface of the reinforcing member, the mounting member is not exposed to the side when the accessory parts are not mounted, and the appearance is good.

In the present invention, the bottom wall of the reinforcing member is provided with a through hole facing in the vertical direction, and the mounting member has a small diameter portion inserted into the mounting hole and a large diameter portion having a diameter larger than that of the through hole. It is preferable to have. According to this configuration, the accessory parts can be easily positioned at the step portion between the large diameter portion and the small diameter portion. Further, by welding to the bottom wall of the reinforcing member at the peripheral edge of the large diameter portion, the influence of welding heat is less likely to be transmitted to the mounting portion (for example, a screw hole).

When the mounting member has a small diameter portion and a large diameter portion, the large diameter portion is located below the small diameter portion, and at least the large diameter portion is formed with a fastening portion for mounting accessory parts. preferable. According to this configuration, since the fastening portion is formed below the reinforcing member, the fastening member can be easily attached to the fastening portion from below.

When the fastening portion is formed in the large diameter portion, the fastening portion is preferably a screw hole penetrating the large diameter portion and the small diameter portion. According to this configuration, the enlargement of the large diameter portion is suppressed and the appearance is improved. Further, since the screw holes are formed in both the large diameter portion and the small diameter portion, the length of the screw holes can be increased and the support of the accessory parts is stable.

In the present invention, it is preferable that the rear end surface of the second frame member is joined to the front surface of the reinforcing member. According to this configuration, since the rear end surface of the second frame member is supported by the reinforcing member, it is not necessary to reinforce the second frame member, and an increase in the weight of the rear frame structure can be suppressed.

When the rear end surface of the second frame member is joined to the front surface of the reinforcing member, the front surface of the reinforcing member and the rear end surface of the second frame member are orthogonal surfaces orthogonal to the longitudinal direction of the second frame member. On the other hand, it is preferable that the shape is inclined rearward as the distance from the orthogonal plane increases in the longitudinal direction. According to this configuration, the joint surface between the reinforcing member and the second frame member becomes large. As a result, the load in the vertical direction due to the attachment of the accessory parts is dispersed and transmitted to the second frame member, so that it is necessary to enlarge the second frame member or reinforce the second frame member. Absent. As a result, an increase in the weight of the rear frame structure can be suppressed.

In the present invention, it is preferable that the first frame member, the second frame member, and the reinforcing member are provided in pairs on the left and right, and further, a connecting member for connecting the pair of left and right reinforcing members is provided. According to this configuration, it is possible to prevent twisting of the left and right rear frame structures.

According to the rear frame structure of the present invention, high rigidity can be ensured while suppressing an increase in weight, and accessory parts can be stably attached.

It is a side view which shows the motorcycle which is a kind of saddle-type vehicle provided with the rear frame structure which concerns on 1st Embodiment of this invention. It is a top view which shows the body frame of the motorcycle. (A) is a side view showing the rear frame structure. (B) is a perspective view which shows the reinforcing member of the rear frame structure. It is sectional drawing which follows the IV-IV line of FIG. 3A. It is a vertical cross-sectional view which shows the rear frame structure. It is a side view which shows the state which the pannier bracket is attached to the rear frame structure. It is a vertical cross-sectional view which shows the state which attached the pannier bracket to the rear frame structure. It is a side view which shows the state which attached the case bracket for a top case to the rear frame structure. It is a top view which shows the case bracket. It is a top view which shows the state which attached the U-shaped lock to the rear frame structure. It is a side view which shows the state which the lock holder for the U-shaped lock is attached to the rear frame structure. It is a side view which shows the state which attached the pannier bracket and the U-shaped lock bracket to the rear frame structure.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the present specification, the "left side" and "right side" refer to the left and right sides as seen by the driver riding the motorcycle.

FIG. 1 is a side view of a motorcycle provided with a rear frame structure according to an embodiment of the present invention. Note that FIG. 1 shows a state in which the accessory parts are not attached. The body frame FR of this motorcycle is made of metal such as steel and has a main frame 1 forming the front half portion and a rear frame structure 2 forming the rear half portion. The main frame 1 has a front main frame piece 1a extending diagonally backward and downward from the head pipe 4 provided at the front end.

As shown in FIG. 2, a pair of left and right front main frame pieces 1a are provided, and the rear ends of the front main frame pieces 1a and 1a are connected by a first cross member 1b extending in the vehicle width direction. As shown in FIG. 1, the main frame 1 further has a rear main frame piece 1c extending obliquely backward and downward from the first cross member 1b. A pair of left and right main frame pieces 1c are also provided. As described above, the main frame 1 is composed of the left and right front main frame pieces 1a and 1a, the first cross member 1b, and the left and right rear main frame pieces 1c and 1c.

The rear frame 2 has a first frame member 21 extending rearward from the first cross member 1b, and a second frame member 22 below the first frame member 21. The front end of the second frame member 22 is connected to the rear end portion of the rear main frame piece 1c, and extends diagonally upward rearward from the front end toward the first frame member 21. The first and second frame members 21 and 22 of the present embodiment are cylindrical pipe members. The first frame member 21 is inclined backward, and in particular, the latter portion is inclined greatly, and the inclination angle thereof is 20 to 40 ° with respect to the horizontal plane. A reinforcing member 24 projecting downward from the first frame member 21 is provided at the rear portion of the first frame member 21. The reinforcing member 24 is a joint portion 23 extending in the front-rear direction along the first frame member 21, and is joined to the first frame member 21 by welding. The second frame member 22 is a straight pipe member extending along the longitudinal axis X1, and is joined to the reinforcing member 24 by welding at the rear end surface 22a.

As shown in FIG. 2, a pair of left and right first frame members 21, second frame members 22, and reinforcing members 24 are also provided. A second cross member 25 for connecting the left and right first frame members 21 and 21 is provided above the middle portion in the front-rear direction of the first frame member 21. The second cross member 25 is joined to the left and right first frame members 21 and 21 by welding. Further, behind the second cross member 25, a third cross member 26, which is a connecting member for connecting the left and right reinforcing members 24, 24, is provided. The third cross member 26 is connected to the lower surfaces of the left and right reinforcing members 24, 24 by bolts. That is, the second cross member 25 is provided on the upper half side of the first frame member 21, and the third cross member 26 is provided on the lower half side of the first frame member 21. As a result, twisting of the pair of left and right first frame members 21 can be suppressed.

As described above, the rear frame structure 2 includes the left and right first frame members 21 and 21, the left and right second frame members 22, 22, the left and right reinforcing members 24 and 24, the second cross member 25, and the third cross member 26. It is composed of. Details of the rear frame structure 2 will be described later.

A front fork 8 is rotatably supported by a head pipe 4 shown in FIG. 1 via a steering shaft (not shown). A steering wheel 6 is fixed to the upper end of the front fork 8, and a front wheel 10 is attached to the lower end of the front fork 8.

A swing arm bracket 9 is provided on the rear main frame piece 1c of the main frame 1. A swing arm 12 is vertically swingably supported around a pivot shaft 16 attached to the swing arm bracket 9. The rear wheel 14 is rotatably supported at the rear end of the swing arm 12. Front side of main frame 1 The engine E is attached to the front side of the swing arm bracket 9 at the lower part of the main frame piece 1a. The engine E drives the rear wheels 14 via a power transmission member 11 such as a chain.

A fuel tank 15 is arranged above the front main frame piece 1a of the main frame 1, and a rider seat 18 and a passenger seat 20 are supported by a first frame member 21 of the rear frame structure 2. Specifically, the passenger seat 20 is supported by the second cross member 25 and the first frame member 21. A step bracket 19 for supporting the passenger step 17 is attached to the second frame member 22 of the rear frame structure 2. The step bracket 19 is attached to the second frame member 22 by two bolts 69 arranged in the front-rear direction.

A pair of left and right rear cowls 27 are arranged at the rear portion of the rear frame structure 2, and cover the area below the rear portion of the rider seat 18 and the region below the passenger seat 20 from the outside. A rear fender 28 is arranged above the rear wheel 14 and below the rear cowl 27 and is supported by the first frame member 21. A rear flap 29 is attached to the lower part of the rear fender 28. Specifically, the rear portion of the rear fender 28 and the rear flap 29 are supported by the third cross member 26. The reinforcing member 24 is covered from the outside by the rear cowl 27 and the rear fender 28.

As shown in FIG. 3A, the reinforcing member 24 has an elongated shape extending in the longitudinal direction of the first frame member 21. As shown in FIG. 3B, the reinforcing member 24 is a member having a U-shaped cross section that opens upward and is obtained by bending a sheet metal. The rear end surface 22a of the second frame member 22 shown in FIG. 3A is joined to the front surface 32 of the reinforcing member 24 by welding. The front surface 32 of the reinforcing member 24 and the rear end surface 22a of the second frame member 22 are inclined rearward with respect to the orthogonal plane PL orthogonal to the longitudinal direction X1 of the second frame member 22 as the distance from the orthogonal plane PL in the longitudinal direction X1. Is formed. The joint portion 25 between the first frame member 21 and the reinforcing member 24 is formed to be longer than the length of the inclined rear end surface 22a of the second frame member 22.

As shown in FIG. 4, the side walls 24a and 24a of the reinforcing member 24 having a U-shaped cross section are joined to both side portions of the first frame member 21. Specifically, the side walls 24a and 24a are joined to the lower side of the portion 21a of the first frame member 21 having the largest dimension in the vehicle width direction. As a result, it is possible to prevent the reinforcing member 24 from becoming larger in the vehicle width direction, and as a result, prevent the reinforcing member 24 from interfering with the rear fender 28 (FIG. 1). Arc-shaped bent portions 24c and 24c are formed at the boundary between the side wall portions 24a and 24a of the reinforcing member 24 and the bottom wall 24b.

A mounting member 30 for mounting an accessory is provided on the lower surface of the reinforcing member 24. Here, the "accessory parts" refer to options and accessories that the user selectively adds. In the present embodiment, two mounting members 30 are provided on each reinforcing member 24 side by side in the front-rear direction. However, the number of mounting members 30 may be one or three or more. If the number of mounting members 30 is one, the manufacturing man-hours can be reduced. If a plurality of mounting members 30 are provided, it becomes possible to correspond to various accessory parts, and the versatility is increased.

As shown in FIG. 5, two through holes 34 facing in the vertical direction are provided side by side in the front-rear direction on the bottom wall 24b of the reinforcing member 24, and the mounting member 30 is mounted in the through holes 34. Specifically, the mounting member 30 has a small diameter portion 36 inserted into the through hole 34 and a large diameter portion 38 having a diameter larger than that of the through hole 34. In the present embodiment, the large diameter portion 38 is located below the small diameter portion 36 and is fixed to the bottom wall 24b of the reinforcing member 24 by welding. That is, the large diameter portion 38 is exposed from the reinforcing member 24.

The mounting member 30 has a fastening portion 40 for mounting accessory parts. The fastening portion 40 of the present embodiment is a screw hole 40 penetrating the large diameter portion 38 and the small diameter portion 36. That is, the mounting member 30 of the present embodiment is a nut member fixed to the bottom wall 24b of the reinforcing member 24. The screw hole 40 may be formed in at least the large diameter portion 38, and may not be formed in the small diameter portion 36.

The lower surface of the reinforcing member 24 is a flat surface. This makes it easy to weld the large diameter portion 38. Further, the lower surface of the reinforcing member 24 and the axis X2 of the screw hole 40 of the mounting member 30 are orthogonal to each other. When a plurality of mounting members 30 are provided as in the present embodiment, the axial centers X2 of the screw holes 40 are parallel to each other. In other words, the lower surfaces of the reinforcing member 24 to which the mounting members 30 are welded are parallel to each other.

The outer diameter of the large diameter portion 38 is larger than the diameter of the through hole 34, but is smaller than the vehicle width direction dimension of the reinforcing member 24 as shown in FIG. As a result, the mounting member 30 does not protrude outward from the reinforcing member 24 in the vehicle width direction. Further, the outer diameter of the large diameter portion 38 is a size extending to the vicinity of the arcuate bent portion 24c of the reinforcing member 24. As a result, the load generated on the large diameter portion 38 of the mounting member 30 can be received by the side walls 24a and 24a.

As shown in FIG. 5, a fender through hole 28a is formed at a position corresponding to each mounting member 30 on the rear fender 28. In the state where the accessory parts are not attached, each fender through hole 28a is closed by the cap 35. Further, a screw hole 42 is formed at the rear end of the bottom wall 24b of the reinforcing member 24. The screw hole 42 is composed of a weld nut joined to the inner surface of the bottom wall 24b. The third cross member 26 (FIG. 3) is bolted to the third cross member 26 using the screw hole 42, and as described above, the rear portion of the rear fender 28 and the rear flap 29 are supported via the third cross member 26. Has been done. This eliminates the need for a support member dedicated to the rear portion of the rear fender 28 and the rear flap 29, which simplifies the configuration of the rear frame structure 2.

FIG. 6 shows a case where the pannier 44 is attached to the rear frame structure 2 as an accessory part. The pannier 44 is a bag for storing articles, and is attached to the side of the rear portion of the vehicle body via an accessory pannier bracket 46. The pannier bracket 46 has a supported portion 48 supported by the vehicle body, a pannier mounting portion 50 to which the pannier 44 is mounted, and a connecting portion 52 connecting the supported portion 48 and the pannier mounting portion 50. The supported portion 48, the pannier mounting portion 50, and the connecting portion 52 are made of a steel pipe material and are integrated by welding.

As shown in FIG. 7, the supported portion 48 is composed of a bottomed cylindrical pipe that opens downward, and two supported portions 48 are provided side by side in the front-rear direction. A bolt insertion hole 48b is formed in the bottom portion 48a of each supported portion 48.

Next, a method of attaching the pannier 44 (FIG. 6) will be described. First, the cap 35 (FIG. 5) is removed from the rear fender 28. A tubular first collar 54 is inserted into the front fender through hole 28a, and one end surface (upper end surface) 54a thereof is brought into contact with the end surface 38a of the large diameter portion 38 of the front mounting member 30. Next, with the bottom 48a of the supported portion 48 on the front side of the pannier bracket 46 in contact with the other end surface (lower end surface) 54b of the first collar 54, the bolt 55 is inserted into the bolt insertion hole 48b and the first collar from below. It is inserted in the order of the inside of 54 and tightened in the screw hole 40 of the mounting member 30 on the front side. That is, the bottom portion 48a of the supported portion 48 and the first collar 54 are sandwiched between the head portion 55a of the bolt 55 and the large diameter portion 38 of the mounting member 30, and are connected by the fastening force of the bolt 55.

The bolt 55 is fastened to the mounting member 30 on the rear side in the same procedure. As a result, the rear portion of the pannier bracket 46 is supported by the rear frame structure 2.

Finally, the pannier 44 of FIG. 6 is attached to the pannier bracket 46. In the present embodiment, the pannier 44 is attached to the pannier bracket 46 by engaging an engaged portion (not shown) provided on the back surface (inner side surface in the vehicle width direction) with the pannier attachment portion 50.

FIG. 8 shows a case where the top case 58 is attached to the rear frame structure 2 as an accessory part. The top case 58 is a case for storing articles, and is attached to the upper part of the rear part of the vehicle body via a case bracket 60 which is an accessory. The case bracket 60 includes a main body portion 62 extending diagonally upward rearward along the rear portion of the vehicle body, front and rear supported portions 64 and 66 supported by the vehicle body, and a case mounting portion 68 to which the top case 58 is attached. are doing. As shown in FIG. 9, the main body 62 is made of a pair of left and right steel pipe members, and the front and rear supported portions 64 and 66 and the case mounting portion 68 are made of steel plates. The front and rear supported portions 64 and 66 and the case mounting portion 68 are joined to the main body portion 62 by welding and integrated.

As shown in FIG. 8, the front supported portion 64 is joined to the front end portion of the main body portion 62, and a through hole 64a facing the vehicle width direction is formed. The rear side supported portion 66 is joined to an intermediate portion in the front-rear direction of the main body portion 62, and has a vertical wall 66a extending downward from the main body portion 62 and a horizontal wall 66b bent inward in the vehicle width direction from the vertical wall 66a. It is a glyph. A bolt insertion hole 66c that faces substantially in the vertical direction is formed in the lateral wall 66b. The case mounting portion 68 is joined to the upper portion of the rear end portion of the main body portion 62.

Next, a method of attaching the top case 58 will be described. First, the front supported portion 64 of the case bracket 60 is fastened together with the rear portion of the step bracket 19 by the bolt 69. Specifically, the bolt 69 is inserted in the order of the through hole 64a of the front supported portion 64 and the bolt insertion hole (not shown) of the step bracket 19 from the outside in the vehicle width direction, and then the second frame of the rear frame structure 2. Tighten into a screw hole (not shown) provided in the member 22. As a result, the front portion of the case bracket 60 is supported by the vehicle body.

Further, an annular spacer 70 is interposed between the large diameter portion 38 of the mounting member 30 and the side wall 66b of the posterior supported portion 66 of the case bracket 60. In this state, the bolt 75 is inserted from below in the order of the bolt insertion hole 66c of the rear side supported portion 66 and the spacer 70, and tightened into the screw hole 40 of the rear side mounting member 30. As a result, the front-rear intermediate portion of the case bracket 60 is supported by the rear frame structure 2.

Finally, the top case 58 is attached to the case bracket 60. The top case 58 is attached to the case mounting portion 68 by using, for example, a bolt (not shown) inserted into the bolt insertion hole 71 of the case mounting portion 68 shown in FIG. In this way, when the top case 58 is attached as an accessory part, only the rear attachment member 30 shown in FIG. 8 is used, and the front attachment member 30 is not used. After attaching the top case 58, the through hole 28a of the rear fender 28 is closed with the cap 35.

FIG. 10 shows a state in which the U-shaped lock 72 is attached to the rear frame structure 2 as an accessory part. The U-shaped lock 72 locks the wheels when parked to prevent the vehicle from moving, and the U-shaped portion 74 locked to the wheels and the tips of the two branch portions 74a and 74a of the U-shaped portion 74 are engaged. It has a long locking portion 76 that fits. The U-shaped lock 72 when not in use is housed between the left and right first frame members 21 and 21 below the passenger seat 20 (FIG. 1), and is accommodated via a pair of left and right lock holders 78 which are accessory parts. , Attached to the rear frame structure 2.

Each lock holder 78 is made of sheet metal and is supported by a vehicle body, a lock holding portion 82 extending inward in the vehicle width direction from the supported portion 80 and holding the lock portion 76, and a lock holding portion 82. It has a U-shaped holding portion 84 that extends rearwardly and holds the U-shaped portion 74. The supported portion 80, the lock holding portion 82, and the U-shaped holding portion 84 may be configured by bending one plate material, or may be integrated by welding separate plate materials. A screw body insertion hole 80a facing in the vertical direction is formed in each supported portion 80.

Next, a method of attaching the U-shaped lock 72 will be described. In the U-shaped lock 72 shown in FIG. 11, first, the screw body 82 is inserted into the screw body insertion hole 80a of the lock holder 78 from below, and then tightened into the screw hole 40 of the rear mounting member 30. As a result, the lock holder 78 is supported by the rear frame structure 2.

Subsequently, the U-shaped lock 72 of FIG. 10 is held in the lock holder 78. Specifically, the lock portion 76 of the U-shaped lock 72 is arranged so that the longitudinal direction is the vehicle width direction, and both ends thereof are placed on the left and right lock holding portions 82. Further, in the U-shaped portion 74 of the U-shaped lock 72, each branch portion 74a is placed on the left and right U-shaped holding portions 84. In the present embodiment, the U-shaped portion 74 is also mounted on the lock portion 76 mounted on the lock holding portion 82. The U-shaped lock 72 held by the lock holder 78 may be fixed with a band (not shown), for example, to prevent its movement.

As described above, even when the U-shaped lock 72 is attached as an accessory part, only the rear attachment member 30 is used, and the front attachment member 30 is not used. After attaching the U-shaped lock 72, the through hole 28a of the rear fender 28 is closed with the cap 35.

FIG. 12 shows a case where the pannier 44 and the U-shaped lock 72 are attached to the rear frame structure 2 as accessory parts. The structure of the front mounting member 30 is the same as that of the example of FIG. 12 and the example of mounting the pannier bracket 46 as an accessory component of FIG. 7, but the structure of the rear mounting member 30 is different.

Specifically, in the example of FIG. 7, the bottom portion 48a of the supported portion 48 and the second collar 56 are sandwiched between the head portion 55a of the bolt 55 and the large diameter portion 38 of the rear mounting member 30. However, in FIG. 12, the bottom portion 48a of the supported portion 48, the third collar 86, and the supported portion 80 of the lock holder 78 are sandwiched. That is, instead of the second collar 56 in FIG. 7, the third collar 86 and the lock holder 78 are arranged in FIG. Therefore, the third collar 86 is shorter than the second collar 56 (FIG. 7) by the thickness of the supported portion 80. As described above, both or one of the pannier 44 and the U-shaped lock 72 can be selectively attached to the rear frame structure 2 of the present embodiment as accessory parts.

In FIGS. 6 to 12, an example in which a pannier 44, a top case 58 or a U-shaped lock 72 is attached to the rear frame structure 2 of the present embodiment as accessory parts has been described, but in addition, as an accessory part, for example, A grip gripped by the passenger and a dress guard that protects the passenger's clothing can also be attached.

According to the above configuration, since the first frame member 21 shown in FIG. 3A is reinforced by the second frame member 22 and the reinforcing member 24, the rigidity of the rear frame structure 2 is improved. Further, since the second frame member 22 is joined to the reinforcing member 24 at the rear end surface 22a, the second frame member 22 can have no bent portion. Therefore, even when the accessory parts are attached to the reinforcing member 24, the load in the vertical direction is not concentrated on the bent portion, and a part of the load acts on the inclined second frame member 22 in the longitudinal direction X1. Therefore, it is not necessary to reinforce the second frame member 22, and it is possible to suppress an increase in the weight of the rear frame structure 2.

Further, since the mounting member 30 is provided on the lower surface of the reinforcing member 24, the mounting member 30 is not exposed to the side when the accessory parts are not mounted, and the appearance is good. When the mounting member 30 is provided on the side surface of the reinforcing member 24, it is necessary to make a bolt insertion hole in the rear cowl 27 of FIG. 1, but this is not necessary in the above configuration. As a result, the bolt is not exposed to the outside and looks good.

As shown in FIG. 5, the mounting member 30 has a small diameter portion 36 inserted into the mounting hole 34 and a large diameter portion 38 having a diameter larger than that of the mounting hole 34. This facilitates the positioning of the accessory parts at the step portion between the large diameter portion 38 and the small diameter portion 36. Further, since it is welded to the bottom wall 24b of the reinforcing member 24 at the peripheral edge of the large diameter portion 38, the influence of the welding heat is not easily transmitted to the screw hole 40.

The large diameter portion 38 is located below the small diameter portion 36, and a fastening portion (screw hole) 40 for attaching an accessory component is formed from the large diameter portion 38 to the small diameter portion. Since the fastening portion 40 is formed below the reinforcing member 24 in this way, the bolt 55 can be attached to the fastening portion 40 from below. Further, since the screw holes 40 are formed in both the large diameter portion 38 and the small diameter portion 36, the length of the screw holes 40 can be increased and the support of the accessory parts is stable.

The rear end surface 22a of the second frame member 22 of FIG. 3A is joined to the front surface 32 of the reinforcing member 24. As a result, since the rear end surface 22a of the second frame member 22 is supported by the reinforcing member 24, it is not necessary to reinforce the second frame member 22, and an increase in the weight of the rear frame structure 2 can be suppressed. Here, since the reinforcing member 24 is inclined backward with the first frame member 21, a part (component) of the load is along the longitudinal direction of the first frame member 21. This component is supported by the second frame member 22. Therefore, the load support is strengthened.

Further, the front surface 32 of the reinforcing member 24 and the rear end surface 22a of the second frame member 22 are rearward as they move away from the orthogonal surface PL in the longitudinal direction X1 with respect to the orthogonal surface PL orthogonal to the longitudinal direction X1 of the second frame member 22. It is formed with an inclination of. As a result, the joint surface J between the reinforcing member 24 and the second frame member 22 becomes large. Therefore, since the component of the load in the vertical direction due to the attachment of the accessory component is dispersed and transmitted to the second frame member 22, the second frame member 22 is enlarged or the second frame member 22 is reinforced. You don't have to. As a result, an increase in the weight of the rear frame structure 2 can be suppressed.

As shown in FIG. 2, a pair of left and right reinforcing members 24 are provided for the first frame member 21, the second frame member 22, and the reinforcing member 24, and the left and right reinforcing members 24 are connected by the connecting member 25. As a result, it is possible to prevent twisting between the left first frame member 21, the second frame member 22 and the reinforcing member 24 and the right first frame member 21, the second frame member 22 and the reinforcing member 24.

The present invention is not limited to the above embodiments, and various additions, changes, or deletions can be made without departing from the gist of the present invention. For example, in the above embodiment, the large diameter portion 38 of the mounting member 30 is located below the small diameter portion 36, but the large diameter portion 38 may be located above the small diameter portion 36. In this case, the large diameter portion 38 is arranged inside the reinforcing member 24. Further, the mounting member 30 does not have to be fixed to the reinforcing member 24 by welding. Further, the fastening portion 40 is not limited to the screw hole, and may be, for example, a bolt provided in the large diameter portion 38. In the above embodiment, the pannier, the top case, and the U-shaped lock are used as the accessory parts, but the accessory parts are not limited to these, and may be, for example, a rear grip, a dress guard, or the like. The rear frame structure of the present invention can also be applied to saddle-type vehicles other than motorcycles, such as tricycles and four-wheel buggies. Therefore, such things are also included in the scope of the present invention.

1 Main frame 2 Rear frame structure 21 First frame member 22 Second frame member 23 Joint part 24 Reinforcing member 26 Third cross member (connecting member)
30 Mounting member 34 Through hole 36 Small diameter part 38 Large diameter part 40 Screw hole (fastening part)
44 Pannier (accessory)
46 Pannier bracket (accessory)
58 Top case (accessory)
60 Case bracket (accessory)
72 U-shaped lock (accessory)
78 Lock holder (accessory)

Claims (7)

A rear frame structure provided behind the main frame of a saddle-mounted vehicle.
A first frame member extending rearward from the main frame and
A reinforcing member that protrudes downward from the first frame member and is joined to the first frame member at a joint portion that extends in the front-rear direction along the first frame member.
A second frame member that extends from the main frame in an upwardly inclined manner and is joined to the reinforcing member at the rear end surface is provided.
A mounting member for mounting accessory parts is provided on the lower surface of the reinforcing member.
The reinforcing member includes a pair of left and right side walls extending downward from the first frame member, a bottom wall connecting the lower ends of the side walls to form the lower surface, and the first extending upward from the front end of the bottom wall. It has a front wall that is joined to the frame member to form the front surface of the reinforcing member.
A rear frame structure of a saddle-mounted vehicle in which the rear end surface of the second frame member is joined to the front wall of the reinforcing member . In the rear frame structure according to claim 1, a through hole facing in the vertical direction is provided in the bottom wall of the reinforcing member.
The mounting member is a rear frame structure of a saddle-type vehicle having a small diameter portion inserted into the through hole and a large diameter portion having a diameter larger than that of the through hole. In the rear frame structure according to claim 2, the large diameter portion is located below the small diameter portion.
A rear frame structure of a saddle-mounted vehicle in which a fastening portion for attaching accessory parts is formed at least in the large diameter portion. In the rear frame structure according to claim 3, the fastening portion is a rear frame structure of a saddle-mounted vehicle, which is a screw hole penetrating the large diameter portion and the small diameter portion. In the rear frame structure according to any one of claims 1 to 4, the front surface of the reinforcing member and the rear end surface of the second frame member are orthogonal to an orthogonal surface orthogonal to the longitudinal direction of the second frame member. The rear frame structure of the saddle-mounted vehicle is formed so as to be inclined rearward as the distance from the orthogonal plane is increased in the longitudinal direction. In the rear frame structure according to any one of claims 1 to 5 , the first frame member, the second frame member, and the reinforcing member are provided in pairs on the left and right sides.
Further, a rear frame structure of a saddle-mounted vehicle including a connecting member for connecting the pair of left and right reinforcing members. In the rear frame structure according to any one of claims 1 to 6, the rear end surface of the second frame member and the front surface of the reinforcing member are orthogonal to an orthogonal surface orthogonal to the longitudinal direction of the second frame member. A rear frame structure of a saddle-mounted vehicle that is inclined downward from the orthogonal plane toward the rear in the longitudinal direction.

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