JP5261298B2 - Cover mounting structure for motorcycles - Google Patents

Description

The present invention relates to a vehicle body cover mounting structure in a motorcycle, and more particularly to a front side cover mounting structure provided below a fuel tank.

In order to provide a front side cover at the lower part of the fuel tank, it is known that a stay welded to the bottom of the fuel tank is suspended downward and the front side cover is attached to this stay (see Patent Document 1).

Japanese Utility Model Publication No.59-137883

As described above, when the stay is welded to the bottom of the fuel tank and the stay extends below the fuel tank so that it protrudes from the outer shape of the fuel tank as viewed from the side of the vehicle, the outer shape of the fuel tank increases accordingly. When transporting the fuel tank, a large space is required. In addition, since the stay is integrated with the fuel tank by welding in advance, if the stay is deformed during transportation or the like, only the stay cannot be replaced, and the entire fuel tank may be replaced.
The present application solves such a problem.

In order to solve the above problems, the invention described in claim 1 relating to a cover mounting structure of a motorcycle includes a vehicle body frame, a fuel tank provided on the vehicle body frame,
In a cover mounting structure for a motorcycle, which is attached to a stay provided at the bottom of the fuel tank and includes a front side cover disposed below the fuel tank,
The stay is attached to the bottom of the fuel tank so as to fit within the outer shape of the fuel tank in a side view of the vehicle;
The tank side bracket is fastened from the inside of the vehicle body and includes a cover side stay for attaching the front side cover.
A fastening surface of the tank side bracket and the cover side stay is inclined so that the upper side in the vehicle vertical direction is on the inner side of the vehicle body.

According to a second aspect of the present invention, in the first aspect, the fastening surface of the tank-side bracket and the cover-side stay is inclined so that the upper side in the vehicle vertical direction is on the inner side of the vehicle body,
The fastening member is provided on the tank side bracket so that the fastening direction is perpendicular to the fastening surface.

The invention described in claim 3 is the above-described claim 1 or 2,
The fuel tank includes a lower tank portion constituting a bottom side of the fuel tank, and
An upper tank part constituting the external part of the fuel tank so as to cover the lower tank part from above;
A peripheral edge portion of the lower tank portion and a peripheral edge portion of the upper tank portion are overlapped and welded so that the lower tank portion and the upper tank portion are integrated, and a coupling edge portion is integrated.
The tank-side bracket is provided on the inner side surface of the connecting edge portion that is bent downward among the connecting edge portions.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the front side cover is provided as a pair facing the left and right, and the front side and the rear side of each front side cover are the cover side It is supported by the stay, and the lower portions of the left and right front side covers are connected by a connecting member.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, a horn is disposed inside the front side cover.

According to the first aspect of the present invention, the stay includes the tank-side bracket and the cover-side stay, and the cover-side stay is detachable from the fuel tank. If only the stay is exchanged, it will be sufficient, and it will become economical.
Further, since the tank side bracket is mounted so as to fit within the outer shape of the fuel tank, the outer shape of the fuel tank is not increased by the protrusion of the tank side bracket, so that a large space is not required for transporting the fuel tank. Therefore, transportation becomes easy and efficient.

According to the invention described in claim 2, since the fastening surfaces of the tank side bracket and the cover side stay are tilted, when the tool is fastened from the inside of the vehicle body, the tool can be put obliquely from below the fuel tank. Therefore, the bottom part of the fuel tank can be easily fastened without being obstructed, and workability is improved.

According to the invention described in claim 3, since the tank side bracket is provided inside the connecting edge of the fuel tank, the front side cover is attached to the outside of the vehicle body as in the case where the tank side bracket is attached to the outside of the connecting edge. Therefore, the front side cover can be prevented from projecting in the vehicle width direction without causing an increase in size in the vehicle width direction.

According to the invention described in claim 4, since the lower portions of the left and right front side covers are connected by the connecting member, the cover side stay that supports the front side cover is large as in the case of supporting the lower side of the front side cover. The stay can be downsized.
In addition, vibration at the lower part of the front side cover due to vehicle body vibration can also be suppressed.

According to the invention described in claim 5, by reducing the size of the cover side stay with the above configuration, a relatively large space can be secured inside the front side cover, and the horn is arranged using this space. Became possible.
In addition, since the horn is arranged inside the front side cover, the horn is hardly seen from the side of the vehicle, and the appearance can be improved.

External side view of a motorcycle to which the present application is applied Front view of the car body Front perspective view of fuel tank and front side cover subassembly Front view of the small assembly Figure showing the small assembly from the rear Figure showing the small assembly from below The perspective view which shows the inner side from diagonally right rear of the said small assembly Side view of the front side cover for the left side The figure which shows the inside from the slanting back Fuel tank side view Perspective view showing bracket Front side view of body frame The figure which shows the front side cover of the attachment state from the vehicle front side 14-14 sectional view of FIG. The figure which shows the attachment part of a horn from the front side Conceptual fuel tank cross section

Hereinafter, an embodiment will be described based on the drawings. FIG. 1 is an external side view of a motorcycle to which the present application is applied. A pair of left and right front forks 2 that support the front wheel 1 are rotatably supported on the head pipe 5 by a top bridge 3 and a bottom bridge 4, and the front wheel 1 is steered by a handle 6 mounted on the top bridge 3. .

The vehicle body frame 7 provided with the head pipe 5 at the front end includes a head pipe 5, a gusset 8 extending rearward from the upper portion of the head pipe 5, and a pair of left and right diagonally downwards extending rearward from the upper rear portion of the gusset 8. A frame 9, a down frame 10 that extends obliquely downward from the lower part of the head pipe 5, a seat rail 11 that extends rearward from the rear part of the main frame 9, and an intermediate part of the seat rail 11 from the lower part of the main frame 9 The rear stay 12 is connected. The engine 13 is supported on the front part of the vehicle body frame including the gusset 8, the main frame 9 and the down frame 10.

The lower end of the main frame 9 supports the front end of the swing arm 14 so as to be swingable in the vertical direction, and the rear wheel 15 is supported on the rear end of the swing arm 14. The rear wheel 15 is driven by the engine 13 by chain drive. A fuel tank 16 is supported on the gusset 8 above the engine 13 and the front of the main frame 9.

The gusset 8 is provided so as to extend rearward of the vehicle along the center of the vehicle body, and a pair of left and right main frames 9 extend obliquely downward from the upper rear portion of the gusset 8. The fuel tank 16 straddles the gusset 8 and the pair of left and right main frames 9 from side to side. A seat 17 is supported on the seat rail 11 behind the fuel tank 16. Reference numeral 18 in the figure denotes a rear cushion that constitutes a rear wheel suspension, and is provided between the rear end of the swing arm 14 and an intermediate portion of the seat rail 11.

A front side cover 20 is provided below the front side surface of the fuel tank 16. The front side cover 20 has a substantially triangular shape that is wide in front as viewed from the side of the vehicle and is convexly narrowed rearward. The front edge overlaps the upper side surface of the down frame 10 and the upper edge overlaps the lower part of the front half of the fuel tank.
A horn bracket 21 is welded to the down frame 10 below the front side cover 20, and a horn 22 attached thereto is disposed inside the front side cover 20.

FIG. 2 is a front view of the vehicle body, and a down frame 10 is provided in the vertical direction along the vehicle body center line C. FIG. A front side cover 20 is disposed symmetrically below the fuel tank 16, and a horn 22 is disposed inside each front side cover 20.
The front fork 2 is also provided as a pair of left and right, and is arranged vertically on the left and right sides of the down frame 10, and the front side cover 20 overlaps in the front view behind the front fork 2.

Next, the relationship between the front side cover 20 and the fuel tank 16 will be described in detail. FIG. 3 is a perspective view showing a small assembly in which the front side cover 20 is attached to the lower part on the front side of the fuel tank 16 from the front, FIG. 4 is a front view of the small assembly, and FIG. 5 is a rear view of the small assembly. FIG. 6 is a view showing the inside of the front side cover 20, FIG. 6 is a view showing the small assembly from below, and FIG. 7 is a front side cover 20 and an outer wall of the fuel tank 16 on the left side from the diagonally right rear side of the small assembly. 8 is a side view of the front side cover 20 for the left side, and FIG. 9 is a view of the front side cover 20 from the rear (the front side cover for the right side is symmetric with those shown in the figure. Appears in).

In these drawings and FIG. 16, the fuel tank 16 includes a lower tank portion 26 that forms a bottom portion of the fuel tank 16, and an upper tank portion 30 that forms an external portion such as an upper surface 28 and an outer surface 29 of the fuel tank 16. The upper tank portion 30 and the lower tank portion 26 are integrated by overlapping the peripheral edge portion 25a of the lower tank portion 26 with the peripheral edge portion 29a of the upper tank portion 30 and welding the overlapped portions to form the coupling edge portion 31. A fuel tank is formed. Further, the lower tank portion 26 forming the bottom portion of the fuel tank 16 has a bottom central portion 24 in which a concave portion 23 is formed which has a substantially U-shape and opens downward in the center of the front surface and extends in the front-rear direction to form a tunnel-like space. , And a bottom side portion 25 disposed on both sides of the bottom center portion 24. The outer side portion of the bottom side portion 25 forms a peripheral edge portion 25a that is bent downward and protrudes. The fuel tank 16 has a gusset 8 and a front portion of the main frame 9 passing through a tunnel-shaped space formed in the recess 23 and extending in the front-rear direction. And supported on the front portion of the main frame 9.

As shown in FIGS. 8 and 9, the front side cover 20 is made of resin, and when viewed from the side of the vehicle, the upper edge 40 extends obliquely downward and rearward, the lower edge 42 extends obliquely upward and rearward, and the front is wide and rearward. It has a generally triangular shape that becomes convex and narrow. Further, the intermediate portion 41 in the vertical direction swells laterally to form a space inside.
An opening 20a is provided in a front portion from the front surface of the front side cover 20 to the front portion of the side surface, and is open to the front and side. As shown in FIG. 8, louvers 43 that connect the front and rear opening edges are provided in the opening 20a in multiple stages in the vertical direction. The louvers 43 are formed so as to extend rearward obliquely upward, a gap 20b is provided between the louvers 43, and a standing wall portion 44 that protrudes rearward from the opening edge portion is provided at the front end portion of each louver 43. Is formed.

A boss 45 is provided on the upper portion of the standing wall portion 44, and a through hole 45a facing the side is formed (FIG. 8). An engaging claw 46 is formed at an intermediate position in the front-rear direction inside the intermediate portion 41 so as to protrude inward in a substantially arrow shape (FIG. 9).
Further, a mounting protrusion 47 projects inwardly at the front lower end of the front side cover 20, and a mounting hole 48 is formed at the tip thereof, which is reinforced by a rib 49 (FIG. 9).

As shown in FIG. 7, the front side cover 20 is supported at the front and rear by a metal cover side stay 50 that is overlapped inside. The front portion of the front side cover 20 is fastened to a weld nut 53 provided in advance at the front portion of the cover-side stay 50 with a bolt 52 inserted from the outside by a boss 45. The rear portion is supported by anti-vibration by inserting the engaging claw 46 into an attachment hole provided in the rear portion 54 of the cover-side stay 50 via the anti-vibration rubber 55.
The rear portion 54 of the cover side stay 50 protrudes outward in an L shape, and a vibration-proof rubber 55 is fitted in the mounting hole in advance.

The cover-side stay 50 is a member that is provided separately from the tank-side bracket 60 that is attached in advance to the inner surface 25b (see FIG. 16) of the peripheral edge 25a that forms the connecting edge 31 of the fuel tank. The nuts 57 are attached to the stud bolts 61 (see FIG. 11 described later) of the tank-side bracket 60 by fastening nuts 57 before and after the upper portion 56.
The lower end portions of the left and right front side covers 20 are connected to the mounting protrusions 47 by connecting brackets 70, respectively. The connecting bracket 70 has a central portion bent rearwardly to form an escape portion 71 for escaping the down tube, left and right connecting ends 72 bent forward, and the connecting end 72 is provided with a weld nut 73. The mounting projection 47 is attached to the bolt 74 via a rubber 75 described later (FIG. 7).

Thus, the left and right front side covers 20 are detachably attached to the fuel tank 16 at the upper and middle portions by the cover side stay 50, and the lower portions of the left and right front side covers 20 are connected by the connecting bracket 70. Thus, it is not necessary to use a large-sized one that supports the cover side stay 50 to the lower part of the front side cover 20, and the cover side stay 50 can be reduced in size and weight. In addition, a large space can be secured inside the front side cover 20 so that a horn described later can be accommodated.

Next, the tank side bracket 60 will be described. FIG. 10 is a side view of the fuel tank 16, and FIG. 11 is a perspective view showing the tank-side bracket 60. In these drawings, the tank-side bracket 60 includes a base plate 67 attached to the inner side surface 25b of the fuel tank by welding, and a stay support member 68 attached to the base plate 67 by welding. The stay support member 68 is formed by bending a belt-like plate material by press molding or the like so that the two convex portions 62 are formed at intervals in the front and rear, and the top surface of the convex portion 62 forms a fastening surface 63, which is a stud. A bolt 61 is formed to protrude inward. As shown in cross section in the enlarged portion of FIG. 10, the stud bolt 61 protrudes obliquely downward from the fastening surface 63 of the convex portion 62 toward the inside of the vehicle body.

Between the front and rear convex portions 62, a valley portion 64 is formed in contact with and welded to the base plate 67, and a step portion 65 is formed between the valley portion 64 and the convex portion 62. The stepped portion 65 is wide at the upper side and narrowed at the lower side because the fastening surface 63 is inclined.
The left and right end portions 66 of the tank side bracket 60 are also welded to the base plate 67 by forming a stepped portion 65 between them and the convex portion 62.

As apparent from FIGS. 10 and 11, the tank-side bracket 60 is preliminarily welded and attached to the inner surface 25b of the fuel tank 16, and at this time, the shape, size and arrangement are arranged so as to fit within the outer shape of the fuel tank 16 in side view. Has been taken into account.

Thus, by making the tank side bracket 60 fit within the outer shape of the fuel tank 16, the fuel tank 16 can be miniaturized and the transportation efficiency can be improved. If the tank-side bracket 60 protrudes from the outer shape of the fuel tank 16, the space occupied by the fuel tank during transportation increases accordingly.

FIG. 12 is a side view of the front half of the body frame 7. The front end portions of the main frame 9 and the down frame 10 and the head pipe 5 are reinforced by gussets 8. A circular engagement protrusion 19 is provided on the side surface of the gusset 8, and a C-shaped engagement recess provided in the bottom side portion 25 by placing the fuel tank 16 on the gusset 8 and pushing it forward. 27 (FIGS. 3 and 10), and the front portion of the fuel tank 16 is attached to the vehicle body frame by engagement.
A horn bracket 21 is provided in the middle of the down frame 10 so as to protrude rearward in the vicinity of the gusset 8.

FIG. 13 is a view showing the relationship between the left and right front side covers 20 and the down frame 10 from the front side of the vehicle. The escape portion 71 of the connection bracket 70 escapes the down frame 10 rearward, and the connection end portion 72 protrudes forward to the extent that it overlaps the down frame 10 in a side view and is attached to the attachment projection 47 with a bolt 74 (FIG. 14). reference).

The horn 22 is disposed inside the left and right front side covers 20 and behind the opening, and sends a horn sound forward from the gap between the louvers 43. The position of the horn 22 is disposed on the inner side of the front side cover 20 so that the position of the horn 22 is less visible. The horn 22 is attached to the horn bracket 21 with a bolt 84 via a horn stay 83.

14 is a cross-sectional view taken along the line 14-14 in FIG. 13, and a vibration-proof rubber 75 is fitted in the mounting hole 48 of the mounting projection 47, and a flange collar 76 is fitted in the center thereof. Therefore, if the mounting protrusion 47 and the connecting end 72 are aligned, and the bolt 74 is passed through the flange collar 76 and fastened to the weld nut 73 provided with the connecting end 72, the lower portions of the left and right front side covers 20 are connected to the connecting bracket. Connected by 70.

FIG. 15 is a view showing a mounting portion of the horn 22 from the front side. The horn 22 is symmetrically arranged with the down frame 10 in between, and a bolt 84 is attached to the horn bracket 21 that is attached to the down frame 10 in advance by a horn stay 83 that extends obliquely from the horn 22 toward the down frame 10. Then, it is fastened to the weld nut 80 provided on the back surface of the horn bracket 21. At this time, the positioning protrusion 82 protruding forwardly provided on the protrusion 81 protruding to the side of the horn bracket 21 is fitted to the horn stay 83 so as to prevent rotation.

FIG. 16 is a cross-sectional view of the conceptual fuel tank 16 for explaining the attachment of the cover-side stay 50. The shapes of the fuel tank 16, the gusset 8, the cover-side stay 50, the tank-side bracket 60, etc. are respectively deformed. It is shown schematically. As shown in this figure, the fastening surface 63 of the tank side bracket 60 is inclined with respect to the vehicle body center line C so that the upper side approaches the vehicle body center line C. The directions perpendicular to the fastening surface 63 are the fastening axes L1 and L2, and the left and right fastening axes L1 and L2 are also inclined with respect to the vehicle body center line C and intersect below the gusset 8.

The cover-side stay 50 is fastened to the tank-side bracket 60 at the fastening surface 63 from the fastening axes L1 and L2 by a nut 57 that is a cap nut. At this time, the fastening tool 90 is inclined along the fastening axes L1 and L2, and the fastening tool 90 is inserted from below the fuel tank 16, so that the bottom part (bottom side part 25) of the fuel tank or the opposite cover side It can be easily mounted without being disturbed by the stay 50 or the like. For this reason, even if the tank side bracket 60 is provided on the inner side surface 25b of the peripheral edge portion 25a, it can be easily attached and workability is improved.
Reference numeral 91 denotes a handle of the fastening tool 90.

Also in this figure, the fuel tank 16 forms a coupling edge 31 by overlapping the peripheral portions 25a and 29a of the lower tank portion 26 and the upper tank portion 30 and welding the mating portions.

The shape and dimensions of the tank-side bracket 60 are arbitrary as long as they fit within the outer shape of the fuel tank 16, and may be nuts instead of the stud bolts 61, for example. In this case, the bracket itself can be formed with a screw hole and a nut portion or a weld nut. Further, even if the fastening surface 63 is not purposely inclined, if the inner side surface 25b inclined obliquely downward is selected and attached in advance, an oblique fastening surface can be obtained without specially forming an inclined surface.

5: head pipe, 7: body frame, 8: gusset, 10: down frame, 16: fuel tank, 20: front side cover, 22: horn, 23: recess, 24: bottom center, 25: bottom side, 26: Lower tank portion, 28: Upper surface, 29: Outer surface, 30: Upper tank portion, 31: Connection edge portion, 50: Cover side stay, 60: Tank side bracket, 70: Connection bracket, 90: Fastening tool

Claims (5)

A vehicle body frame, a fuel tank provided on the vehicle body frame,
In a cover mounting structure for a motorcycle, which is attached to a stay provided at the bottom of the fuel tank and includes a front side cover disposed below the fuel tank,
The stay is attached to the bottom of the fuel tank so as to fit within the outer shape of the fuel tank in a side view of the vehicle;
A cover mounting structure for a motorcycle, which is fastened to the tank side bracket from the inside of the vehicle body and includes a cover side stay for attaching the front side cover. The fastening surface of the tank side bracket and the cover side stay is inclined so that the upper side in the vehicle vertical direction is on the inside of the vehicle body,
2. The cover mounting structure for a motorcycle according to claim 1, wherein a fastening member is provided on the tank side bracket so that a fastening direction is perpendicular to a fastening surface. The fuel tank includes a lower tank portion constituting a bottom side of the fuel tank, and
An upper tank part constituting the external part of the fuel tank so as to cover the lower tank part from above;
A peripheral edge portion of the lower tank portion and a peripheral edge portion of the upper tank portion are overlapped and welded so that the lower tank portion and the upper tank portion are integrated, and a coupling edge portion is integrated.
3. The cover mounting structure for a motorcycle according to claim 1, wherein the tank side bracket is provided on an inner side surface of the joint edge portion bent downward in the joint edge portion. The front side covers are provided as a pair facing the left and right sides, the front and rear portions on the upper side of each front side cover are supported by the cover side stay, and the lower portions of the left and right front side covers are connected by a connecting member. The cover mounting structure for a motorcycle according to any one of claims 1 to 3. The cover mounting structure for a motorcycle according to any one of claims 1 to 4, wherein a horn is disposed inside the front side cover.

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