JP2023032714A - Fuel tank fixing structure of saddle-riding type vehicle and saddle-riding type vehicle - Google Patents

Abstract

To fix a fuel tank of a saddle-riding type vehicle to a vehicle body properly with a simple structure.SOLUTION: A fuel tank fixing structure includes: a plate member 21 joined to a fuel tank 1; a boss member 25 which is joined to the plate member 21 while protruding from the plate member 21 in an out-of-plane direction; and a connection member 40 which connects the boss member 25 to a vehicle body. The plate member 21 includes: a first joint part, a joint part joined to the fuel tank 1, and a second joint part, a joint part joined to the boss member 25, and is formed so that a plate thickness of the second joint part is larger than a plate thickness of the first joint part.SELECTED DRAWING: Figure 3

Description

The present disclosure relates to a structure for fixing a fuel tank of a straddle-type vehicle to a vehicle body.

A motorcycle (straddle-type vehicle) disclosed in Patent Document 1 below is known. This motorcycle includes a vehicle body and a fuel tank in which fuel is stored. The fuel tank is fixed to the vehicle body by being fastened to the frame forming the vehicle body via bolts and nuts.

Japanese Patent No. 3489918

It is desirable that the fuel tank be fixed to the vehicle body with required rigidity. However, it is undesirable to complicate the fixing structure of the fuel tank in order to ensure rigidity.

The present disclosure has been made in view of the circumstances as described above, and provides a fuel tank fixing structure for a straddle-type vehicle capable of appropriately fixing a fuel tank to a vehicle body with a relatively simple structure, and a straddle-type vehicle. The purpose is to provide a model vehicle.

In order to solve the above-described problems, a fuel tank fixing structure according to one aspect of the present disclosure is a structure for fixing a fuel tank to a vehicle body of a straddle-type vehicle, and includes a plate member joined to the fuel tank. a boss member that is joined to the plate member in a state of protruding from the plate member in an out-of-plane direction; and a connecting member that connects the boss member to the vehicle body, wherein the plate member is joined to the fuel tank. and a second joint portion that is a joint portion with the boss member, and the plate thickness of the second joint portion is larger than the plate thickness of the first joint portion. It is formed.

A straddle-type vehicle according to another aspect of the present disclosure includes a fuel tank that stores fuel, a plate member that is joined to the fuel tank, and a plate member that is joined to the plate member while protruding from the plate member in an out-of-plane direction. and a bracket including a first fixing portion fixed to the boss member and a second fixing portion fixed to the vehicle body, and the plate member is a joint portion to the fuel tank. A first joint portion and a second joint portion that is a joint portion with the boss member are included, and the plate thickness of the second joint portion is formed so as to be larger than the plate thickness of the first joint portion. It is.

According to the fuel tank fixing structure for a saddle-ride type vehicle and the saddle-ride type vehicle of the present disclosure, the fuel tank can be appropriately fixed to the vehicle body with a relatively simple structure.

1 is a side view of a motorcycle to which a fuel tank fixing structure according to an embodiment of the present disclosure is applied; FIG. FIG. 4 is a cross-sectional view showing the fuel tank and the vehicle body frame thereunder; 3 is an enlarged sectional view enlarging a part of FIG. 2; FIG. FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 3; FIG. 4 is a cross-sectional view of a single front stay; It is the bottom view which looked at the front-end part of the fuel tank from the downward direction. FIG. 4 is an exploded perspective view showing how the front stay is fixed to the tank inner panel; FIG. 4 is an exploded perspective view showing how the bracket is fixed to the front stay; FIG. 11 is a perspective view showing a state in which the bracket has been completely fixed to the front stay;

[Overall Configuration of Motorcycle]
FIG. 1 is a side view of a motorcycle to which a fuel tank fixing structure according to one embodiment of the present disclosure is applied. The motorcycle includes a fuel tank 1, a body frame 101, front wheels 102 and rear wheels 103, a head pipe 104, a front fork 105, a handle 106, a swing arm 107, a seat 108, and an engine 109. . That is, the motorcycle is a two-wheeled vehicle that runs by the driving force of the engine 109, and is a type of straddle-type vehicle.

The fuel tank 1 is a tank that stores fuel to be supplied to the engine 109 . The fuel tank 1 is fixed to the vehicle body frame 101 by a fixing structure which will be described later.

Body frame 101 includes main frame 111 , lower frame 112 , first connecting frame 113 , second connecting frame 114 , and rear frame 115 . The main frame 111 is a frame extending backward and downward from the upper portion of the head pipe 104 while being inclined. The lower frame 112 is a frame extending rearwardly and downwardly from the lower portion of the head pipe 104 . The lower frame 112 is greatly inclined below the main frame 111 so that the distance from the main frame 111 increases toward the rear. The first connecting frame 113 is a frame that vertically connects the front end portion of the main frame 111 and the front end portion of the lower frame 112 . The second connecting frame 114 is a frame that connects the intermediate portions of the main frame 111 and the lower frame 112 in the front-rear direction. The rear frame 115 is a frame that extends from the rear portion of the main frame 111 while tilting backward and upward.

Although details are omitted, the vehicle body frame 101 has a symmetrical structure. That is, the frame groups 111 to 115 of the vehicle body frame 101 described above are provided not only on the left side of the vehicle body shown in FIG. 1, but also on the right side. In other words, the body frame 101 includes a pair of main frames 111 and a pair of lower frames 112 branching to the left and right from the head pipe 104 and extending obliquely downward, and a pair of connecting the left and right main frames 111 and the left and right lower frames 112 . A first connecting frame 113 and a pair of second connecting frames 114, and a pair of rear frames 115 extending rearward from the left and right main frames 111 are provided.

The head pipe 104 is a pipe material to which the front ends of the main frame 111 and the lower frame 112 are commonly coupled. The head pipe 104 is arranged to extend in the vertical direction in an inclined posture so that the upper end is located rearward from the lower end.

The front fork 105 is rotatably supported by the head pipe 104 via a steering shaft (not shown). The front fork 105 extends vertically while being inclined at the same angle as the head pipe 104 . A handle 106 is attached to the upper end of the front fork 105 , and the front wheel 102 is pivotally supported to the lower end of the front fork 105 .

Swing arm 107 is an arm that connects body frame 101 and rear wheel 103 and extends in the front-rear direction. A front end portion of the swing arm 107 is pivotally supported by a rear end portion of the main frame 111 . A rear wheel 103 is pivotally supported at the rear end of the swing arm 107 . That is, the swing arm 107 supports the rear wheel 103 so as to be vertically swingable with respect to the main frame 111 .

The seat 108 is a seat on which a rider (rider) who drives the motorcycle sits. Seat 108 is supported on rear frame 115 .

The engine 109 is, for example, a four-cycle internal combustion engine. Engine 109 is supported by vehicle body frame 101 below fuel tank 1 . The engine 109 includes a cylinder block 121 containing a space (cylinder) in which fuel supplied from the fuel tank 1 is combusted. A crankshaft, which is the output shaft of the engine 109, is rotatably attached to the lower portion of the cylinder block 121. As shown in FIG. The rotation of the crankshaft is transmitted to rear wheels 103 via transmission 123 and chain 124 . That is, the engine 109 is a drive source that rotationally drives the rear wheels 103 .

The motorcycle of the present embodiment is a so-called naked type motorcycle that is not equipped with a cover (cowl) that covers the periphery of the engine 109 . Therefore, main parts of the engine 109 including the cylinder block 121 are exposed to the outside air on both left and right sides.

[Fuel tank fixing structure]
FIG. 2 is a cross-sectional view showing the fuel tank 1 and the body frame 101 thereunder, and FIG. 3 is an enlarged cross-sectional view showing a part of FIG. As shown in the figure, the fuel tank 1 is a tank having a storage space S in which fuel is stored, and includes a tank outer panel 11 and a tank inner panel 12 . The tank outer panel 11 is a panel forming an outer wall of the fuel tank 1 , and the tank inner panel 12 is a panel forming an inner wall of the fuel tank 1 . The fuel tank 1 is fixed to the vehicle body frame 101 with the tank outer panel 11 facing up and the tank inner panel 12 facing down.

The tank outer panel 11 and the tank inner panel 12 have flanges 11a and 12a at their peripheral edges. By joining the flange portion 11a of the tank outer panel 11 and the flange portion 12a of the tank inner panel 12 by welding or the like, the fuel tank 1 in which both panels 11 and 12 are integrated is constructed. The tank outer panel 11 and the tank inner panel 12 are formed so as to be separated from each other in regions other than the flange portions 11a and 12a. Thereby, a storage space S is formed between the tank outer panel 11 and the tank inner panel 12 .

A tank cap 13 that functions as a fuel filler port is attached to the front portion of the tank outer panel 11 . A rear portion of the tank inner panel 12 is formed with a fuel supply hole 12b to which a fuel pump (not shown) is attached. The fuel pump supplies the fuel stored in the storage space S to the engine 109 through the fuel supply hole 12b.

Fuel tank 1 is fixed to vehicle body frame 101 by fastening its front portion to main frame 111 and fastening its rear portion to rear frame 115 . Each fixing structure of the front portion and the rear portion of the fuel tank 1 is as follows in detail.

First, the fixing structure of the rear portion of the fuel tank 1 will be described. The rear portion of fuel tank 1 is fixed to the front portion of rear frame 115 via rear stay 60 . The rear stay 60 is an L-shaped plate when viewed from the side, and is joined to the rear fixing portion 18 of the tank outer panel 11 by welding or the like. The rear fixing portion 18 is a vertically extending vertical wall that covers the lower rear end region of the storage space S from behind. The rear stay 60 has a protruding portion 60 a that protrudes rearward from the rear fixed portion 18 while being joined to the rear fixed portion 18 . A pedestal 115a facing the projecting portion 60a of the rear stay 60 is joined to the front portion of the rear frame 115 by welding or the like. The rear portion of the fuel tank 1 is fixed to the rear frame 115 by fastening the projecting portion 60a of the rear stay 60 to the pedestal 115a via fastening members 61 such as bolts. A rubber bush 62 is attached to the fastening portion between the rear stay 60 and the pedestal 115a by the fastening member 61 . The rubber bushing 62 is a damping rubber component similar to the rubber bushing 52 that is applied to the front portion of the fuel tank 1 and will be described later.

The rear stays 60 are used individually for the left and right rear frames 115 . That is, the rear portion of fuel tank 1 is fixed to right rear frame 115 and left rear frame 115 shown in FIG. 2 using rear stays 60, respectively. Specifically, the rear stays 60 are joined to the left and right two locations of the rear portion of the fuel tank 1, respectively, and the pedestals 115a are provided to the front portions of the left and right rear frames 115, respectively. By fixing each rear stay 60 to each pedestal 115 a via a fastening member 61 , the rear portion of the fuel tank 1 is fixed to each of the left and right rear frames 115 .

Next, the fixing structure of the front portion of the fuel tank 1 will be described. A front portion of the fuel tank 1 is fixed to a front end portion of the main frame 111 via a front stay 20 and a bracket 40 . The front fixing portion 16 is a bottom wall that covers the front end region of the storage space S from below. The front stay 20 is welded to the front fixed portion 16 . The bracket 40 is fixed to the front stay 20 and the tank inner panel 12 by fastening the rear end portion (first fixing portion 41 to be described later) to the front stay 20 via a first fastening member 51 such as a bolt. be. A boss portion 111a projecting upward is joined to the front end portion of the main frame 111 by welding or the like. The front portion of the fuel tank 1 is fixed to the main frame 111 by fastening the front end portion of the bracket 40 (second fixing portion 42 described later) to the boss portion 111a via a second fastening member 55 such as a bolt. be done. Note that the bracket 40 corresponds to the "connecting member" in the present disclosure.

The front stay 20 and bracket 40 are commonly used for the left and right main frames 111 . That is, the front portion of the fuel tank 1 is fixed not only to the right main frame 111 shown in FIGS. 2 and 3 but also to the left main frame 111 using the common front stay 20 and bracket 40 . Specifically, a common front stay 20 is joined to the front fixing portion 16 of the tank inner panel 12, and boss portions 111a are provided at the front end portions of the left and right main frames 111, respectively. The front portion of the fuel tank 1 is fixed to the left and right main frames 111 by connecting the left and right boss portions 111 a and the front stay 20 to each other via a common bracket 40 .

The fixing structure of the front portion of the fuel tank 1 will be described in more detail with reference to FIGS. 4 to 9. FIG. 4 is a cross-sectional view taken along line IV--IV of FIG. 3. FIG. FIG. 5 is a sectional view of the front stay 20 alone. FIG. 6 is a bottom view of the front end of the fuel tank 1 as seen from below. 7 is an exploded perspective view showing how the front stay 20 is fixed to the tank inner panel 12. FIG. 8 is an exploded perspective view showing how the bracket 40 is fixed to the front stay 20. FIG. FIG. 9 is a perspective view showing how the bracket 40 has been completely fixed to the front stay 20. As shown in FIG.

As shown in FIGS. 3 to 7, the front stay 20 includes a plate member 21 and a pair of left and right boss members 25. As shown in FIGS. The plate member 21 is a plate-shaped member joined to the front fixing portion 16 of the tank inner panel 12 . Each boss member 25 is a cylindrical member joined to the plate member 21 in a state of protruding downward from the plate member 21 .

The plate member 21 is a composite product made up of two plates that overlap in the thickness direction. Specifically, the plate member 21 includes a main plate 22 and a sub-plate 23 . The main plate 22 is a rectangular plate member whose dimension in the left-right direction (vehicle width direction) is larger than its dimension in the front-rear direction. The sub-plate 23 is a strip-shaped (elliptical) plate material having an area smaller than that of the main plate 22 . The sub-plate 23 is formed so that its lateral and longitudinal dimensions are smaller than the corresponding dimensions of the main plate 22 . The main plate 22 and the sub-plate 23 are joined together in an overlapping state so that the upper surface 22b of the main plate 22 and the lower surface 23a of the sub-plate 23 are in contact with each other.

In this embodiment, the thickness t2 of the sub-plate 23 is greater than the thickness t1 of the main plate 22, as shown in FIG. Also, the thickness t1 of the main plate 22 is greater than the thickness t3 of the tank inner panel 12 (FIG. 4). That is, in this embodiment, the plate thicknesses of the main plate 22 and the sub-plate 23 are set so that the relationship of t2>t1>t3 is established. More specifically, the plate thickness t2 of the sub-plate 23 is more than 1 time and 2 times or less the plate thickness t1 of the main plate 22 (t1<t2≦t1×2). Further, the thickness t1 of the main plate 22 is more than 1 time and less than 2 times the thickness t3 of the tank inner panel 12 (t3<t1≦t3×2). Since the thickness t3 of the tank inner panel 12 is smaller than both the thickness t1 of the main plate 22 and the thickness t2 of the sub-plate 23, the weight of the fuel tank 1 can be easily reduced.

The sub-plate 23 has a pair of joint holes h<b>2 capable of receiving the respective boss members 25 as holes for joint with the pair of boss members 25 . Each joint hole h2 is a circular hole penetrating through the sub-plate 23 in the thickness direction. Each boss member 25 is joined to the sub-plate 23 with its upper end inserted into each joining hole h2. That is, the upper end portion of each boss member 25 is joined to the sub-plate 23 by being welded to the periphery of each joint hole h2 by arc welding or the like. By welding the upper end to the periphery of each joint hole h2, the boss member 25 is joined to the sub-plate 23 with most of the boss member 25 excluding the upper end protruding below the lower surface 23a of the sub-plate 23. 4 and 5, a weld bead generated by welding the boss member 25 and the sub-plate 23 is indicated by W. As shown in FIG.

The main plate 22 has a pair of insertion holes h<b>1 at positions overlapping the joint holes h<b>2 of the sub-plate 23 . Each insertion hole h1 is a circular hole penetrating the main plate 22 in the thickness direction. The diameter of the insertion hole h1 is the same as or slightly larger than the diameter of the joint hole h2. A boss member 25 joined to the sub-plate 23 is inserted through the insertion hole h1. That is, the main plate 22 and the sub-plate 23 are overlapped in the thickness direction with the pair of boss members 25 inserted through the pair of insertion holes h1 of the main plate 22, respectively.

The main plate 22 and the sub-plate 23 are joined by spot welding while overlapping each other in the thickness direction as described above. In FIG. 6, the point where this spot welding is performed is illustrated as a welding point P2. In this embodiment, a case where there are a total of three welding points P2 is exemplified. That is, the main plate 22 and the sub-plate 23 are spot-welded at one welding point P2 set between the pair of boss members 25 and two welding points P2 set outside the pair of boss members 25. is joined by It should be noted that the number of welding points P2 may be plural, and the number of welding points P2 may be increased or decreased as appropriate.

By joining the main plate 22 and the sub-plate 23 as described above, the plate member 21 composed of the plates 22 and 23 and the pair of boss members 25 are fixed to each other, and the front stay 20 is constructed. In this state, the pair of boss members 25 protrude further downward than the lower surface 22a of the main plate 22. As shown in FIG. In other words, the pair of boss members 25 protrude in the direction away from the fuel tank 1 along the normal to the lower surface 22a of the plate member 21 (main plate 22), that is, in the out-of-plane direction of the plate member 21. 21.

The main plate 22 is joined to the front fixing portion 16 of the tank inner panel 12 by spot welding. In FIG. 6, the point where this spot welding is performed is illustrated as a welding point P1. In this embodiment, a total of 12 welding points P1 are illustrated. That is, the main plate 22 is spot-welded to the front fixed portion 16 of the tank inner panel 12 at 12 welding points P1 that are arranged along the periphery of the main plate 22 at substantially equal intervals. It should be noted that the number of welding points P1 may be plural, and may be increased or decreased appropriately from twelve.

Here, the positions of the welding points P1 between the main plate 22 and the tank inner panel 12 are set so that the pitch, which is the center-to-center distance between adjacent welding points P1, is equal to or greater than a predetermined specified value. This specified value is determined in consideration of welding quality and the like, and can be set to about 20 mm, for example. Similarly, the positions of the welding points P2 between the main plate 22 and the sub-plate 23 are set so that the pitch of the welding points P2 is equal to or greater than the specified value.

The sub-plate 23 is joined to the main plate 22 inside the weld point P1 between the main plate 22 and the tank inner panel 12 . That is, the sub-plate 23 is joined to a region including the central portion of the main plate 22 and excluding the peripheral portion. In FIG. 6, the overlapping area between the main plate 22 and the sub-plate 23 is colored. In this way, the plate member 21 can be divided into a colored region where the main plate 22 and the sub-plate 23 overlap, and a non-colored region outside the colored region. The colored region is a region where the pair of boss members 25 are joined, and the non-colored region is a region where the tank inner panel 12 is joined.

Here, of the plate member 21, the non-colored region that is the joint portion with the tank inner panel 12 (fuel tank 1) is the first joint portion R1, and the colored region that is the joint portion with the boss member 25 is the second joint portion R2. called. The plate thickness of the first joint portion R1 is the plate thickness t1 of the main plate 22 itself. The plate thickness of the second joint portion R2 is the sum of the plate thickness t1 of the main plate 22 and the plate thickness t2 of the sub-plate 23 . Therefore, the plate thickness (t1+t2) of the second joint portion R2 is larger than the plate thickness (t1) of the first joint portion R1. In other words, the plate member 21 includes a first joint portion R1 with a small plate thickness joined to the fuel tank 1 and a second joint portion R2 with a large plate thickness to which the boss member 25 is joined.

The plate member 21 (the main plate 22 and the sub-plate 23), in a state of being joined to the front fixing portion 16 of the tank inner panel 12, is arranged laterally with respect to the tank axis L1 (FIG. 6) that bisects the fuel tank 1 horizontally. It has a symmetrical shape. As a result, the pair of boss members 25 are arranged symmetrically with respect to the tank axis L1. In other words, the pair of boss members 25 are attached at two positions on the left and right sides of the plate member 21 sandwiching the tank axis L1 and at the same distance from the tank axis L1.

Particularly, as shown in FIG. 5, the pair of boss members 25 are formed with screw holes 25a. The screw hole 25 a is a screw hole that can be screwed with the shaft portion of the first fastening member 51 and is formed along the axis of the boss member 25 . The screw hole 25a is bored from the lower surface of the boss member 25 to the vicinity of the upper surface (midway in the vertical direction) so as not to penetrate the boss member 25 . In other words, the boss member 25 has a screw hole 25a and a closing portion 25b that closes the upper end of the screw hole 25a (the end on the tank inner panel 12 side).

The front fixing portion 16 of the tank inner panel 12 is a substantially rectangular area corresponding to the planar shape of the plate member 21 (or the main plate 22). That is, as shown in FIGS. 3 and 7, the front fixing portion 16 includes a rectangular frame-shaped convex portion 16a and a concave portion 16b formed inside the convex portion 16a. The concave portion 16b has an oblong shape that is elongated in the left-right direction when viewed from the bottom. The convex portion 16a is a convex portion formed by raising the circumference of the concave portion 16b by one step (protruding downward), and is formed in a rectangular frame shape surrounding the concave portion 16b. The convex portion 16a is formed in a region that overlaps the peripheral portion of the main plate 22 when viewed from the bottom. It should be noted that the convex portion 16a corresponds to the "part to be joined" in the present disclosure.

As shown in FIGS. 6 and 7, a plurality of ridges 17 are provided on the convex portion 16a. Each protrusion 17 is arranged along the outer periphery of the protrusion 16a. In addition, a plurality of stepped portions 22d are formed on the outer periphery of the main plate 22 to avoid interference with the ridges 17. As shown in FIG. Each stepped portion 22d is formed at four corners of the rectangular main plate 22, respectively. That is, the contour lines of the four corners of the main plate 22 are formed so as to be recessed one step inward from the contour lines of the other portions, thereby forming stepped portions 22d at the four corners of the main plate 22, respectively. ing.

When the main plate 22 is joined to the front side fixing portion 16, the main plate 22 is positioned with respect to the front side fixing portion 16 (tank inner panel 12) by the sliding contact of the protrusions 17 with the step portions 22d. . With this positioning, the main plate 22 is arranged so that its peripheral edge portion overlaps the convex portion 16a of the front side fixing portion 16 when viewed from the bottom. Then, in a state in which the main plate 22 and the convex portion 16a overlap each other in this way, the main plate 22 is fixed to the front side fixing portion 16 by spot-welding a plurality of locations (welding points P1 described above) of the overlapping portion. be done.

With the peripheral portion of the main plate 22 joined to the convex portion 16a of the front fixing portion 16 as described above, the sub-plate 23 is arranged at a position overlapping the concave portion 16b in bottom view. That is, the sub-plate 23 has an outer shape slightly smaller than the recess 16b in bottom view. By joining the sub-plate 23 to a region including the central portion of the main plate 22, the sub-plate 23 is accommodated in the recess 16b when the main plate 22 is joined to the front fixing portion 16. As shown in FIG. This leads to avoidance of interference between the sub-plate 23 and the front fixing portion 16 .

The main plate 22 has a pair of left and right projecting pieces 24 . The pair of protruding pieces 24 are formed to protrude downward from left and right side portions of the flat plate portion of the main plate 22 . Each projecting piece 24 is formed with a hanging hole 24a. The hanging hole 24a is a hole for hanging the fuel tank 1 when the fuel tank 1 is painted. That is, the fuel tank 1 is held in a suspended state by a predetermined hanger during painting. At this time, the suspension hole 24a functions as an engagement hole for engaging the hanger with the projecting piece 24. As shown in FIG.

As shown in FIGS. 3, 8 and 9, the bracket 40 has a first fixing portion 41 fixed to the boss member 25 of the front stay 20 and a second fixing portion 41 fixed to the boss portion 111a of the main frame 111. 42 and an intermediate portion 43 connecting the first fixing portion 41 and the second fixing portion 42 . As shown in FIG. 3 , the first fixing portion 41 is arranged substantially parallel to the plate member 21 of the front stay 20 below the plate member 21 . Specifically, the first fixing portion 41 is fixed to the boss member 25 in an inclined posture along the lower surface 22a of the plate member 21 (main plate 22) so that the height increases toward the rear. The second fixing portion 42 is arranged substantially parallel to the main frame 111 above the front end portion of the main frame 111 . Specifically, the second fixing portion 42 is fixed to the boss portion 111a of the main frame 111 in an inclined posture along the front end portion of the main frame 111 so that the height decreases toward the rear. The intermediate portion 43 connects the first fixing portion 41 and the second fixing portion 42 in an inclined posture so as to be non-parallel to both the first fixing portion 41 and the second fixing portion 42 .

A pair of left and right fastening holes 42 a ( FIGS. 8 and 9 ) are formed in the second fixing portion 42 . Each fastening hole 42a is a circular through-hole for inserting the second fastening member 55 (FIG. 3). The second fastening member 55 is screwed to the boss portion 111a of the main frame 111 while being inserted into the fastening hole 42a. That is, the second fastening members 55 inserted through the pair of fastening holes 42 a are screwed to the respective boss portions 111 a of the left and right main frames 111 , thereby fixing the second fixing portion 42 to the left and right main frames 111 . be done.

A pair of left and right fastening holes 41 a ( FIG. 8 ) are formed in the first fixing portion 41 . Each fastening hole 41 a is a through hole for receiving the boss member 25 . A first fastening member 51 is screwed to the boss member 25 inserted into the fastening hole 41a. That is, the first fixing member 41 is fixed to the front stay 20 by screwing the first fastening members 51 to the pair of boss members 25 inserted into the pair of fastening holes 41a.

As shown in FIGS. 4, 8 and 9, each fastening hole 41a of the first fixing portion 41 is fitted with a rubber bush 52, respectively. The rubber bushing 52 is an elastic cylindrical rubber part. A constricted portion 52a (FIG. 4) having a relatively reduced outer diameter is formed in the middle of the rubber bush 52 in the axial direction. The rubber bushing 52 is press-fitted into the fastening hole 41a so that the constricted portion 52a of the rubber bushing 52 fits inside the fastening hole 41a. As a result, the constricted portion 52 a is engaged with the peripheral edge of the fastening hole 41 a and the rubber bush 52 is fixed to the first fixing portion 41 .

The rubber bushing 52 has a hollow portion capable of receiving the boss member 25 . That is, the boss member 25 is coaxially inserted inside the rubber bush 52 mounted in the fastening hole 41 a of the first fixing portion 41 . In addition, the first fastening member 51 is screwed into the screw hole 25 a of the boss member 25 while the boss member 25 is inserted inside the rubber bush 52 in this way. A ring-shaped washer 53 is arranged between the rubber bush 52 and the head of the first fastening member 51 . Thereby, the rubber bush 52 is sandwiched and fixed between the head portion (or the washer 53 ) of the first fastening member 51 and the plate member 21 . That is, the rubber bush 52 is compressed and fixed by the first fastening member 51 while surrounding the boss member 25 . Further, by fixing the rubber bush 52 around the boss member 25 in this manner, the first fixing portion 41 is fixed to the boss member 25 via the rubber bush 52 . In other words, the first fixing portion 41 of the bracket 40 is fixed to the boss member 25 via the first fastening member 51 , the washer 53 and the rubber bush 52 .

[Procedure for fixing the front part of the fuel tank to the vehicle body]
Next, a procedure for fixing the front portion of the fuel tank 1 to the main frame 111 using the front stay 20 and the bracket 40 having the structures described above will be described. It should be noted that "upward" and "downward" in the following description are directions based on the state in which the fuel tank 1 is completely attached to the vehicle body frame 101, and are intended to limit the attitude of the fuel tank 1 during fixing work. isn't it.

First, the front stay 20 is assembled. That is, the pair of boss members 25 are joined to the sub-plate 23, and the sub-plate 23 is overlapped with the upper surface 22b of the main plate 22 and joined. Specifically, the upper ends of the pair of boss members 25 are inserted into the pair of joint holes h2 of the sub-plate 23, and the upper ends of the respective boss members 25 are welded to the rims of the respective joint holes h2. Then, the sub-plate 23 is placed on the upper surface 22b of the main plate 22 while the boss members 25 joined to the sub-plate 23 are passed through the pair of insertion holes h1 of the main plate 22 . Then, the main plate 22 and the sub-plate 23 are joined to each other by spot-welding three welding points P2 (FIG. 6) set in the overlapping portions of the two. As described above, the front stay 20 integrally including the plate member 21 composed of the main plate 22 and the sub-plate 23 and the pair of boss members 25 is completed.

Next, the completed front stay 20 is joined to the front fixing portion 16 of the tank inner panel 12 . Specifically, the front stay 20 is brought into contact with the front fixing portion 16 from below while positioning the front stay 20 at a prescribed position surrounded by the protrusions 17 around the front fixing portion 16 . As a result, the first joint portion R1 (FIG. 6) of the plate member 21, that is, the peripheral edge portion of the main plate 22 located outside the overlap region between the sub-plate 23 and the main plate 22 is aligned with the convex portion 16a of the front fixing portion 16. is superimposed. Then, the front stay 20 is joined to the front fixed portion 16 by spot welding 12 welding points P1 set in the overlapping portion between the main plate 22 and the convex portion 16a. Note that the tank inner panel 12 is not joined to the tank outer panel 11 when the front stay 20 is joined. In other words, the front stay 20 is joined to the tank inner panel 12 in a single piece state, which is not joined to the tank outer panel 11 .

Next, the tank outer panel 11 is joined to the tank inner panel 12 . Thus, the fuel tank 1 composed of the tank outer panel 11 and the tank inner panel 12 is constructed.

Next, the bracket 40 is attached to the front portion of the fuel tank 1 . That is, the first fixing portion 41 of the bracket 40 is fastened to the front stay 20 joined to the front fixing portion 16 of the tank inner panel 12 . Specifically, the rubber bushes 52 are fitted to the pair of fastening holes 41a of the first fixing portion 41, respectively, and the rubber bushes 52 are externally fitted to the pair of boss members 25 of the front stay 20, respectively. Then, in this state, the first fastening members 51 are screwed into the screw holes 25a of the pair of boss members 25, respectively. At this time, a washer 53 is arranged between the head of each fastening member 51 and each rubber bush 52 . As a result, the rubber bushing 52 is sandwiched between the head (or washer 53 ) of the first fastening member 51 and the plate member 21 to fix the first fixing portion 41 to the boss member 25 via the rubber bushing 52 . fixed to

Next, the second fixing portion 42 of the bracket 40 is fastened to the main frame 111 . Specifically, the second fastening members 55 are inserted into the pair of fastening holes 42a of the second fixing portion 42, respectively, and the second fastening members 55 are screwed to the boss portions 111a of the left and right main frames 111, respectively. , the second fixing portion 42 is fixed to each main frame 111 . By the above procedure, the front portion of the fuel tank 1 is fixed to the left and right main frames 111 .

[Effect]
As described above, in this embodiment, the front stay 20 including the plate member 21 (the main plate 22 and the sub-plate 23) and the boss member 25 is joined to the front fixing portion 16 of the tank inner panel 12, and the boss By connecting the member 25 to the main frame 111 via the bracket 40, the fuel tank 1 is fixed to the vehicle body (body frame 101). Such a configuration has the advantage that the fuel tank 1 can be appropriately fixed to the vehicle body with a relatively simple structure.

Specifically, in the present embodiment, the main plate 22 having a large area and the sub-plate 23 having a small area are superimposed and joined in the thickness direction, so that the first joint portion R1 and the second joint portion R1 and the second joint portion having different plate thicknesses A plate member 21 containing R2 is constructed (see FIG. 6). The boss member 25 is joined to the thick second joint R2, and the thin first joint R1 is joined to the front fixing portion 16 of the tank inner panel 12. As shown in FIG. As a result, the boss member 25 can be firmly joined to the plate member 21, and good joint quality between the plate member 21 and the tank inner panel 12 can be ensured.

More specifically, the second joint portion R2, which is the overlapping region between the main plate 22 and the sub-plate 23, has a thickness corresponding to the total thickness of the plates 22 and 23 (t1+t2 in FIG. 4). The plate thickness of the second joint portion R2 is larger than the plate thickness of the first joint portion R1 where the plates 22 and 23 do not overlap (that is, the plate thickness t1 of the main plate 22 alone). Therefore, by joining the boss member 25 to the second joint portion R2 having such a large plate thickness, the boss member 25 can be firmly joined to the plate member 21 while projecting the boss member 25 from the plate member 21. can.

On the other hand, since the tank inner panel 12 is joined to the first joint portion R1 having a small plate thickness, it is possible to suppress the difference in plate thickness between the two and to ensure good joint quality. That is, the plate thickness t3 of the tank inner panel 12 is generally limited to a relatively small value from the viewpoint of reducing the weight of the fuel tank 1 and the like. When the plate member 21 is spot-welded to such a thin tank inner panel 12, if there is a large difference in plate thickness between the two, problems such as poor penetration are likely to occur, increasing the possibility of poor joining. On the other hand, in the present embodiment, the first joint portion R1 having a relatively small plate thickness is joined to the tank inner panel 12 by spot welding. It becomes difficult to occur, and good bonding quality can be ensured.

As described above, in this embodiment, both the boss member 25 and the plate member 21 and the plate member 21 and the tank inner panel 12 can be satisfactorily joined. It can be firmly fixed to the tank inner panel 12. - 特許庁Therefore, by connecting the boss member 25 to the main frame 111 via the bracket 40, the front portion of the fuel tank 1 can be appropriately fixed to the main frame 111, and the support rigidity of the fuel tank 1 can be increased. can.

Further, in this embodiment, in which the quality of the joint between the plate member 21 (first joint portion R1) and the tank inner panel 12 can be easily ensured, post-treatment such as brazing for supplementing the joint strength becomes unnecessary. As a result, the structure for fixing the front portion of the fuel tank 1 to the vehicle body can be simplified, and the supporting rigidity of the fuel tank 1 can be increased.

Further, in this embodiment, the plate thickness t2 of the sub-plate 23 is made larger than the plate thickness t1 of the main plate 22 . With such a configuration, the plate thickness (t1+t2) of the second joint R2, which is the overlapping region of the main plate 22 and the sub-plate 23, can be sufficiently increased, and the boss member is provided at the second joint R2. 25 can be joined with sufficient strength.

In this embodiment, the upper end of the boss member 25 is inserted into the joint hole h2 formed in the sub-plate 23, and the upper end of the boss member 25 is welded to the periphery of the joint hole h2. Further, the main plate 22 is formed with an insertion hole h1 through which the boss member 25 can be inserted. According to such a configuration, the boss member 25 can be made to protrude downward from the main plate 22 through the insertion hole h1 while the boss member 25 is firmly joined to the sub-plate 23 .

In particular, in the present embodiment in which the sub-plate 23 is provided with the joint hole h2, the weld bead W (see FIGS. 4 and 5) generated by welding the boss member 25 and the sub-plate 23 is formed between the sub-plate 23 and the main plate 22. Since it does not become an obstacle during bonding, the bonding quality between the main plate 22 and the sub-plate 23 can be improved. That is, if the upper end of the boss member 25 is butt-welded to the lower surface of the sub-plate 23 that has no hole, the weld bead generated by the welding will be interposed between the main plate 22 and the sub-plate 23, and the main A gap may occur between the plate 22 and the sub-plate 23 . In contrast, in the present embodiment, the upper end of the boss member 25 and the peripheral edge of the joint hole h2 are welded together, so that the weld bead W is formed on the upper surface of the sub-plate 23. As shown in FIG. As a result, the above-described situation in which a weld bead is interposed between the main plate 22 and the sub-plate 23 can be avoided, and the main plate 22 and the sub-plate 23 can be joined while being sufficiently brought into close contact with each other.

In addition, in the present embodiment, a concave portion 16b that is recessed upward is formed in a region of the front fixing portion 16 of the tank inner panel 12 facing the sub-plate 23 . That is, the front fixing portion 16 includes a rectangular frame-shaped convex portion 16a that is joined to the peripheral portion (first joint portion R1) of the main plate 22, and an inner side of the convex portion 16a that overlaps the sub-plate 23 in bottom view. It has a concave portion 16b formed in a region that faces (opposes). According to such a configuration, a space for accommodating the sub-plate 23 can be formed by the recess 16b so that the sub-plate 23 does not interfere with the front fixing portion 16 when the main plate 22 is joined to the projection 16a. . Thereby, the joint quality between the plate member 21 and the front fixing portion 16 can be further improved.

In this embodiment, the boss member 25 is formed with a non-penetrating screw hole 25a, and the first fixing portion 41 of the bracket 40 is attached to the boss through a first fastening member 51 that is screwed into the screw hole 25a. It is fastened to member 25 . According to such a configuration, it is possible to prevent the tank inner panel 12 from being damaged by human error when screwing the first fastening member 51 into the screw hole 25 a of the boss member 25 . Assuming that the screw hole 25a penetrates the boss member 25, for example, if a fastening member having a longer axial length than originally intended is used by mistake, the fastening member penetrates the boss member 25 and the tank inner panel 12 It may reach (the wall surface of the recess 16b) and damage the tank inner panel 12 . On the other hand, in the present embodiment in which the screw holes 25a are non-penetrating, there is no concern that fastening members having different sizes will penetrate the boss member 25. FIG. Therefore, damage to the tank inner panel 12 as described above can be avoided, and good quality of the fuel tank 1 can be ensured.

Further, in this embodiment, the rubber bush 52 is attached to the fastening hole 41 a formed in the first fixing portion 41 of the bracket 40 . The rubber bush 52 is compressed and fixed while surrounding the boss member 25 by the first fastening member 51 screwed to the boss member 25 . According to such a configuration, vibration transmitted from the main frame 111 (vehicle body) to the fuel tank 1 via the bracket 40 can be absorbed by the rubber bush 52, and vibration of the fuel tank 1 can be suppressed. . This contributes to improving the riding comfort of the motorcycle.

Further, in the present embodiment, projecting pieces 24 are provided on the left and right side portions of the main plate 22, and hanging holes 24a are formed in the projecting pieces 24. As shown in FIG. According to such a configuration, it is possible to suspend the fuel tank 1 during the painting of the fuel tank 1 by utilizing the parts joined to the fuel tank 1 for fixing to the vehicle body. In particular, in this embodiment, since the main plate 22 joined to the front fixing portion 16 of the tank inner panel 12 is formed with the suspension hole 24a, the front portion of the fuel tank 1 faces upward when the fuel tank 1 is painted. The fuel tank 1 can be suspended in this posture. This means that the fuel tank 1 is suspended with the rear portion of the fuel tank 1 including the fuel supply hole 12b facing downward. If the fuel tank 1 is suspended in such a posture, excess liquid that has entered the inside (storage space S) of the fuel tank 1 can be easily sucked out from the fuel supply hole 12b. That is, when the fuel tank 1 is painted, liquid such as a solvent used in pretreatment such as degreasing may enter the inside of the fuel tank 1 . Even in such a case, according to the present embodiment in which the main plate 22 is formed with the suspension holes 24a, the fuel tank 1 can be suspended with the rear portion of the fuel tank 1 including the fuel supply hole 12b facing downward. Therefore, by introducing a suction hose into the fuel tank 1 through the fuel supply hole 12b, the liquid can be easily sucked out.

[Modification]
In the above embodiment, the thickness t1 of the main plate 22, the thickness t2 of the sub-plate 23, and the thickness t3 of the tank inner panel 12 (fuel tank 1) satisfy the relationship t2>t1>t3. However, the relation of plate thickness is not limited to this. For example, the plate thicknesses t1 and t2 of the main plate 22 and the sub-plate 23 may be set to be the same, or the plate thickness t1 of the main plate 22 may be set larger than the plate thickness t2 of the sub-plate 23 . Also, the thickness (t1 or t2) of at least one of the main plate 22 and the sub-plate 23 may be set equal to or less than the thickness t3 of the tank inner panel 12 .

In the above-described embodiment, two plates (main plate 22 and sub-plate 23) having different areas are overlapped and joined in the thickness direction as the plate member 21, but the plate member 21 has a different thickness depending on the location. It may consist of a single plate. That is, the plate member 21 has a small plate thickness at a portion (first joint portion R1) joined to the fuel tank 1, and a large plate thickness at a portion (second joint portion R2) joined to the boss member 25. It does not matter whether the plate is a combination of a plurality of plates or a single plate.

In the above-described embodiment, the plate thicknesses t1 and t2 of the main plate 22 and the sub-plate 23 constituting the plate member 21 are set larger than the plate thickness t3 of the tank inner panel 12 (fuel tank 1). The relationship is not limited to this. However, at least the plate member 21 should be formed so that the plate thickness (t1+t2 in the above embodiment) of the second joint R2 is larger than the plate thickness t3 of the tank inner panel 12 . By doing so, the first joint portion R1 of the plate member 21 can be satisfactorily joined to the fuel tank 1 while improving the moldability of the fuel tank 1 . That is, by making the plate thickness of the tank inner panel 12 smaller than at least the plate thickness of the second joint portion R2, it is possible to improve the formability when forming the tank inner panel 12 by press forming or the like, thereby improving the fuel tank. 1 manufacturing efficiency can be improved. On the other hand, the fact that the thickness of the tank inner panel 12 is smaller than the thickness of the second joint portion R2 means that the thickness difference between the tank inner panel 12 and the first joint portion R1 can be kept small. As a result, problems such as poor penetration are less likely to occur when welding the tank inner panel 12 and the first joint portion R1, so that good joint quality can be ensured.

In the above embodiment, an example in which a pair of left and right boss members 25 are joined to the plate member 21 has been described, but the number of boss members is not limited to two, and may be one or three or more.

In the above-described embodiment, the tank inner panel 12 is formed with the front fixing portion 16 including the convex portion 16a to which the plate member 21 (main plate 22) is joined and the concave portion 16b recessed from the convex portion 16a. The shape of the portion 16 is not limited to this. For example, it is possible to use a plate member whose surface facing the front fixing part 16 is flat, and in such a case, the front fixing part 16 can be formed flat. Further, even when the plate member 21 including the main plate 22 and the sub-plate 23 is used as in the above-described embodiment, the front fixing portion 16 is formed between at least the upper end portion of the boss member 25 and the periphery of the joint hole h2 of the sub-plate 23. It is only necessary to have a concave portion that is recessed so as to create a gap with respect to the joint portion (weld bead W) of. Thereby, at least the interference between the weld bead W and the tank inner panel 12 can be avoided.

In the above-described embodiment, an example in which the fuel tank fixing structure of the present disclosure is applied to the front portion of the fuel tank 1 has been described. It is also applicable when

In the above-described embodiment, an example in which the fuel tank fixing structure of the present disclosure is applied to a motorcycle, which is a type of straddle-type vehicle, has been described. It can also be applied to straddle-type vehicles.

[summary]
The embodiment and its modifications are summarized below.

A fuel tank fixing structure is a structure for fixing a fuel tank to a vehicle body of a straddle-type vehicle, and includes a plate member joined to the fuel tank, and a plate member protruding from the plate member in an out-of-plane direction. A boss member to be joined and a connecting member for connecting the boss member to the vehicle body are provided. The plate member includes a first joint portion that is a joint portion with the fuel tank and a second joint portion that is a joint portion with the boss member, and the plate thickness of the second joint portion is the first joint portion. It is formed so as to be larger than the plate thickness of the joint.

In this aspect, the boss member is joined to the second joint portion of the thick plate member, so that the boss member can be firmly joined to the plate member while protruding from the plate member. On the other hand, since the first joint portion of the plate member having a small thickness is joined to the fuel tank, it is possible to ensure good joining quality between the two. That is, the plate thickness of the fuel tank is generally limited to a relatively small value from the viewpoint of weight reduction. When a plate member is joined to such a small-thickness fuel tank by spot welding or the like, if there is a large difference in plate thickness between the two, defects such as poor penetration are likely to occur, and the possibility of joining failure increases. . On the other hand, in this aspect, since the first joint portion having a relatively small plate thickness is joined to the fuel tank, the plate thickness difference can be suppressed, and a good joint quality can be ensured.

Thus, in this aspect, both the boss member and the plate member and the plate member and the fuel tank can be joined well, so that the boss member can be firmly fixed to the fuel tank via the plate member. can. Therefore, by connecting the boss member to the vehicle body via the connecting member, the fuel tank can be appropriately fixed to the vehicle body, and the supporting rigidity of the fuel tank can be increased.

In addition, in this aspect, in which the quality of the joint between the plate member (first joint) and the fuel tank can be easily ensured, post-treatment such as brazing for supplementing joint strength becomes unnecessary. As a result, the structure for fixing the fuel tank to the vehicle body can be simplified, and the support rigidity of the fuel tank can be increased.

Preferably, the plate thickness of the fuel tank is smaller than the plate thickness of the second joint portion.

In this aspect, the first joint portion of the plate member can be satisfactorily joined to the fuel tank while improving the moldability of the fuel tank. That is, by making the plate thickness of the fuel tank smaller than at least the plate thickness of the second joint portion of the plate member, it is possible to improve the moldability when the fuel tank is formed by press molding or the like, and the fuel tank can be manufactured. Efficiency can be increased. On the other hand, the plate thickness of the fuel tank being smaller than the plate thickness of the second joint means that the plate thickness difference between the fuel tank and the first joint can be kept small. As a result, defects such as poor penetration are less likely to occur when welding the fuel tank and the first joint portion, so that good joint quality can be ensured.

Preferably, the plate member includes a main plate and a sub-plate joined to the main plate so as to overlap with the main plate in the thickness direction and having a smaller area than the main plate. In this case, the overlapping region of the main plate and the sub-plate in the plate member is the second joint portion, and the non-overlapping region of the main plate and the sub-plate is the first joint portion.

In this aspect, by overlapping and joining the sub-plate with a small area to the main plate with a large area, the plate member (including the first joint portion and the second joint portion) having different plate thicknesses depending on the location can be easily formed. be able to.

Preferably, the thickness of the sub-plate is greater than the thickness of the main plate.

In this aspect, the plate thickness of the second joint formed by the overlapping region of the main plate and the sub-plate can be made sufficiently large, and the boss member can be joined to the second joint with sufficient strength.

Preferably, the sub-plate has a joint hole capable of receiving the fuel tank side end of the boss member. The main plate has an insertion hole through which the boss member can be inserted, at a position overlapping the joint hole.

In this aspect, the boss member can be made to protrude from the main plate through the insertion hole while being firmly joined to the sub-plate.

In particular, in this aspect in which the sub-plate is provided with the joint hole, for example, a weld bead generated when the end of the boss member is welded to the peripheral edge of the joint hole does not interfere with the joining of the sub-plate and the main plate. As a result, the main plate and the sub-plate can be bonded while being sufficiently in close contact with each other, and the bonding quality between the two can be improved.

Preferably, the fuel tank has a concave portion that is recessed so as to form a gap with respect to a joint portion between the end portion of the boss member and the peripheral edge of the joint hole.

In this aspect, it is possible to prevent the joining portion (for example, a weld bead) between the end portion of the boss member and the peripheral edge of the joining hole from interfering with the fuel tank.

More specifically, the fuel tank preferably has a joined portion that is joined to the main plate, and the recess that is formed in a region facing the sub-plate and is recessed from the joined portion.

In this aspect, the main plate can be satisfactorily joined to the joined portion protruding from the recess. In addition, a recess can be formed to accommodate the sub-plate so that the sub-plate does not interfere with the fuel tank when the main plate is joined.

Preferably, the fuel tank fixing structure further includes a fastening member for fastening the connecting member to the boss member. The boss member has a screw hole into which the fastening member is screwed, and a closing portion that closes the fuel tank side end of the screw hole.

In this aspect, it is possible to prevent the fuel tank from being damaged due to human error when screwing the fastening member into the screw hole of the boss member. If the screw hole were to pass through the boss member, for example, if a fastening member with a longer axial length than originally intended was used by mistake, the fastening member would penetrate the boss member and reach the wall surface of the fuel tank. , the fuel tank may be damaged. On the other hand, in this aspect in which the screw holes are non-penetrating, there is no concern that fastening members of different sizes will penetrate the boss member. Therefore, damage to the fuel tank as described above can be avoided, and good quality of the fuel tank can be ensured.

1: Fuel tank 16a: Convex part (part to be joined)
16b: concave portion 21: plate member 22: main plate 23: sub-plate 25: boss member 25a: screw hole 25b: closing portion 40: bracket (connecting member)
41: First fixing part 42: Second fixing part 51: First fastening member (fastening member)
R1: first joint R2: second joint h1: insertion hole h2: joint hole t1: (main plate) thickness t2: (sub-plate) thickness t3: (fuel tank) thickness

Claims (9)

A structure for fixing a fuel tank to a vehicle body of a straddle-type vehicle,
a plate member joined to the fuel tank;
a boss member joined to the plate member in a state of protruding in an out-of-plane direction from the plate member;
a connecting member that connects the boss member to the vehicle body;
The plate member includes a first joint portion that is a joint portion with the fuel tank and a second joint portion that is a joint portion with the boss member, and the plate thickness of the second joint portion is the first joint portion. A fuel tank fixing structure for a straddle-type vehicle, which is formed so as to be larger than the plate thickness of a joint portion. In the fuel tank fixing structure for a straddle-type vehicle according to claim 1,
A fuel tank fixing structure for a straddle-type vehicle, wherein the fuel tank has a plate thickness smaller than that of the second joint portion. In the fuel tank fixing structure for a straddle-type vehicle according to claim 1 or 2,
The plate member includes a main plate and a sub-plate joined to the main plate so as to overlap in the thickness direction and having a smaller area than the main plate,
A straddle-type vehicle, wherein an overlapping region of the main plate and the sub-plate in the plate member is the second joint portion, and a non-overlapping region of the main plate and the sub-plate is the first joint portion. fuel tank fixing structure. In the fuel tank fixing structure for a straddle-type vehicle according to claim 3,
A fuel tank fixing structure for a straddle-type vehicle, wherein the sub-plate has a thickness larger than that of the main plate. In the fuel tank fixing structure for a straddle-type vehicle according to claim 3 or 4,
the sub-plate has a joint hole capable of receiving the fuel tank side end of the boss member;
The fuel tank fixing structure for a straddle-type vehicle, wherein the main plate has an insertion hole through which the boss member can be inserted, at a position overlapping the joint hole. In the fuel tank fixing structure for a straddle-type vehicle according to claim 5,
The fuel tank fixing structure for a straddle-type vehicle, wherein the fuel tank has a concave portion that is recessed so as to form a gap with respect to a joint portion between the end portion of the boss member and the peripheral edge of the joint hole. In the fuel tank fixing structure for a straddle-type vehicle according to claim 6,
The fuel tank fixing structure for a straddle-type vehicle, wherein the fuel tank has a joined portion joined to the main plate, and the recess formed in a region facing the sub-plate and recessed from the joined portion. . In the fuel tank fixing structure for a straddle-type vehicle according to any one of claims 1 to 7,
further comprising a fastening member for fastening the connecting member to the boss member;
A fuel tank fixing structure for a straddle-type vehicle, wherein the boss member has a screw hole into which the fastening member is screwed, and a closing portion that closes an end portion of the screw hole on the fuel tank side. a fuel tank that stores fuel;
a plate member joined to the fuel tank;
a boss member joined to the plate member in a state of protruding in an out-of-plane direction from the plate member;
a bracket including a first fixing portion fixed to the boss member and a second fixing portion fixed to the vehicle body;
The plate member includes a first joint portion that is a joint portion with the fuel tank and a second joint portion that is a joint portion with the boss member, and the plate thickness of the second joint portion is the first joint portion. A straddle-type vehicle formed to be larger than the plate thickness of a joint.

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