JP4498998B2 - Motorcycle fuel tank support structure - Google Patents

Description

  The present invention relates to a fuel tank support structure in a motorcycle in which a fuel tank is mounted on a portion surrounded by a seat frame and a main frame.

2. Description of the Related Art Conventionally, as the fuel tank support structure, a structure in which a fuel tank is fixed to a main frame and then a seat frame is fixed to the main frame and is engaged with the fuel tank (see, for example, Patent Document 1). .)
Japanese Patent Publication No. 4-29592

By the way, in the above structure, the fuel tank and the seat frame are individually attached to the main frame, and when the seat frame is attached to the main frame, it is necessary to position it relative to both the main frame and the fuel tank. Therefore, the assembling work tends to be complicated, and there is a demand for improvement in this respect.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to facilitate the work of attaching the fuel tank and the seat frame to the main frame in a motorcycle fuel tank support structure in which the fuel tank is disposed in a space surrounded by the main frame and the seat frame. To do.

As a means for solving the above problems, the invention described in claim 1 is characterized in that a seat (for example, the seat 41 of the embodiment) is provided behind a main frame (for example, the main frame 11 of the embodiment) that supports the engine (for example, the engine 31 of the embodiment). ) Is removably attached, and a fuel tank (for example, the fuel of the example) is installed in a space (for example, the space K of the example) surrounded by the main frame and the seat frame. In the fuel tank support structure of a motorcycle (for example, the motorcycle 1 of the embodiment) in which the tank 61) is disposed,
The fuel tank, which has a (respective fastening portions 69,76 of the example embodiment) fixing portion to said seat frame, have a engaging portion (e.g., the engaging portion 81 in the embodiment) relative to the main frame, the locking The joint portion is provided at the front portion of the fuel tank, and the engaging portion supports the upper end portion of the rear cushion (for example, the rear cushion 28 of the embodiment) at the rear portion of the main frame (for example, the cushion of the embodiment). Engaging the bracket 22) via a rubber (for example, rubber cushion 87 in the embodiment),
The seat frame has a pair of left and right upper seat rails (for example, the upper seat rail 15 of the embodiment) and a lower seat rail (for example, the lower seat rail 16 of the embodiment),
The fixing portion includes an upper fastening portion (for example, an upper fastening portion 69 of the embodiment and a lower fastening portion (for example, the lower fastening portion 76 of the embodiment), and these portions are substantially in the center in the front-rear direction and the rear of the fuel tank. Provided in at least one of
The upper fastening portion is provided at a substantially central portion in the left-right direction of the fuel tank, and a rubber (for example, a rubber bush of the embodiment) is disposed on an upper cross member (for example, the upper cross member 23 of the embodiment) between the pair of left and right upper seat rails. 71) is fastened and fixed via
The lower fastening portions are provided on the left and right sides of the lower portion of the fuel tank, and fastened and fixed to the pair of left and right lower seat rails via rubber (for example, rubber bush 77 of the embodiment),
A rear wheel drive mechanism (for example, the drive chain 37 of the embodiment) is provided below the lower fastening portion located on the rear side of the fuel tank,
A recess (for example, a recess 66 of the embodiment) that secures a swinging space upward of a rear wheel (for example, the rear wheel 7 of the embodiment) is formed in the left and right intermediate portion on the lower side of the rear portion of the fuel tank. Features.

According to a second aspect of the present invention, the engaging portion is engageable with the bracket when the seat frame is fixed to the main frame after the fuel tank is fixed to the seat frame. It is characterized by that.
According to a third aspect of the present invention, the fuel tank is provided with a cover locking portion (for example, the cover locking portion 65a of the embodiment) for attaching left and right side covers (for example, the side cover 51 of the embodiment) to the vehicle body. It is characterized by

According to the present invention, only by engaging the engaging portion of the fuel tank with the main frame, a part of the fuel tank can be supported by the main frame. Can be easily installed.

According to this invention, the rear cushion supporting bracket is also used as the mating part of the engaging portion, and the number of parts can be reduced.

According to the present invention, the front portion of the fuel tank is supported by the vehicle body frame via the engaging portion, and the seat frame only needs to support only the central portion or the rear portion in the front-rear direction of the fuel tank. The number of fixing points between the seat frame and the seat frame can be reduced.

According to the present invention, a rear wheel drive mechanism (drive chain or the like) is usually disposed below one side of the seat frame, and these are located at the front portion of the front lower seat frame when the swing arm swings up and down. Although it is easy to approach, by providing a fixing part for the lower seat rail on the one side at the rear part of the fuel tank, it becomes difficult for the fixing part to come close to the rear wheel drive mechanism, so that the degree of freedom in layout of each part is improved. Can do.

According to the present invention, the fuel tank can be a rubber mount for both the main frame and the seat frame.

According to the present invention, after the fuel tank and the seat frame are assembled together and attached to the main frame, the fuel tank and the seat frame can be easily attached to the main frame, and the number of work steps in the production line is reduced. can do.

  Embodiments of the present invention will be described below with reference to the drawings. Note that the directions such as front, rear, left and right in the following description are the same as those in the vehicle unless otherwise specified. In the figure, the arrow FR indicates the front of the vehicle, the arrow LH indicates the left side of the vehicle, and the arrow UP indicates the upper side of the vehicle.

  In the motorcycle 1 shown in FIG. 1, the upper portion of the front fork 3 that pivotally supports the front wheel 2 is pivotally supported by the head pipe 6 of the vehicle body frame 5 via the steering stem 4 and pivotally supports the rear wheel 7. The front end portion of the swing arm 8 is pivotally supported by the pivot plate 9 of the vehicle body frame 5 via the pivot shaft 9a so as to be swingable up and down.

The vehicle body frame 5 is configured such that a seat frame 14 is detachably connected to the rear of the main frame 11.
The main frame 11 is a pair of left and right main tubes 12 extending obliquely downward and rearward from the upper part of the head pipe 6 and is bent and rearward after extending obliquely downward and rearward from the lower part of the head pipe 6 at a steeper slope than the main tube 12. And a pair of left and right pivot plates 9 that connect the rear end portion of the main tube 12 to the upper portion and connect the rear end portion of the down tube 13 to the lower portion.

An engine 31 that is a prime mover of the motorcycle 1 is suspended from the main frame 11, and a part of the down tube 13 is configured to be detachable in order to facilitate maintenance of the engine 31.
A rising portion 17 that extends upward is formed at the rear of the left and right main frames 11, and an upper connecting portion 18 that protrudes rearward is provided at the upper end portion of the rising portion 17. In addition, a lower connecting portion 19 that protrudes rearward is provided at the rear portion of the left and right pivot plate 9, and the front end portion of the seat frame 14 is connected to each of the connecting portions 18 and 19.

  The seat frame 14 includes a pair of left and right upper seat rails 15 extending rearward slightly upward from the upper connecting portion 18, and a pair of left and right lower seats extending obliquely upward and rearward from the lower connecting portion 19 with a steeper slope than the upper seat rail 15. Rail 16. These upper and lower seat rails 15, 16 are joined together at their rear end portions, and their front end portions are connected to each other via the rear portion of the main frame 11, so that side surfaces are formed on the rear portion of the body frame 5. A left and right closed loop structure having a triangular shape is formed. Hereinafter, the space surrounded by the closed loop structure will be described as K.

  A cross member 21 extending in the left-right direction (vehicle width direction) is provided between the left and right rising portions 17 in the main frame 11. A cushion bracket 22 that supports the upper end portion of the rear cushion 28 is provided at a substantially central portion of the cross member 21 in the vehicle width direction. The lower end portion of the rear cushion 28 is connected to a link mechanism 29 straddling between the lower front side of the swing arm 8 and the lower rear side of the pivot plate 9.

  The engine 31 suspended from the main frame 11 is a narrow-angle V-type two-cylinder engine having a crankshaft parallel to the vehicle width direction. A forward tilt cylinder 33 and a rearward tilt cylinder 34 are erected on a crankcase 32. Become. In a side view of the engine 31, the forward tilt cylinder 33 is disposed so as to be sandwiched between the main tube 12 and the down tube 13, and the rear tilt cylinder 34 is disposed so as to overlap the rear portion of the main tube 12.

  The rear part of the crankcase 32 also serves as a transmission case. A drive sprocket 35 is arranged on the left side of the rear part of the crankcase 32. A drive chain (rear wheel) is connected to the drive sprocket 35 and the driven sprocket 36 on the left side of the rear wheel 7. The drive mechanism) 37 is turned around, so that power transmission between the engine 31 and the rear wheel 7 is enabled. Here, instead of the sprockets 35 and 36, pulleys may be provided, and a drive belt may be hung around the pulleys. Moreover, it is good also as a rear-wheel drive mechanism using a shaft and a gear instead of a chain or a belt. Reference numeral 37a denotes a chain cover that covers the rear portion of the drive chain 37 and the upper portion of the rear sprocket.

  A throttle body 38 is disposed between the cylinders 33 and 34, and an air cleaner box 39 is disposed above the throttle body 38. The air cleaner box 39 is positioned above the main tube 12 so as to be disposed between the knees of the driver seated on the front portion of the seat 41. Accordingly, the fuel tank 61 that is normally disposed at the position is disposed in the space K below the seat 41 (below the upper seat rail 15) in the rear portion of the vehicle body frame 5.

The air cleaner box 39 is covered with a tank cover 43 connected to both sides of the rear portion of the front cowl 42. A battery 44 is housed in the tank cover 43 together with the air cleaner box 39.
The front cowl 42 covers the front part of the main frame 11 from the front side to both sides, and a headlamp 45, a meter panel 46, a radiator 47, and the like are disposed inside the front cowl 42.

  Reference numeral 48 denotes a front fender that covers the upper part of the front wheel 2 from above, reference numeral 49 denotes an undercover that covers the front part of the crankcase 32 of the engine 31 from the front, and reference numeral 51 denotes a fuel tank 61 in the space K. Reference numeral 52 denotes a bar cover attached to the steering stem 4, reference numeral 53 denotes a rear carrier attached to the rear part of the seat frame 14 so as to continue to the rear part of the seat 41, and reference numeral 54 denotes an upper part of the rear wheel 7. The rear fenders that are arranged diagonally from top to rear are shown.

  From the exhaust ports at the front part of the forward tilt cylinder 33 and the rear part of the rear tilt cylinder 34, exhaust pipes 55 are respectively led out and routed to the right side of the engine 31, and the exhaust pipes 55 are gathered together at the lower part of the vehicle body. After that, it rises diagonally upward and rearward and is connected to a silencer 56 disposed on the right side of the vehicle body.

  The seat 41 disposed on the seat frame 14 is formed by integrally providing front and rear seats for a driver and a rear passenger, and the seat 41 is supported by the left and right upper seat rails 15 and the rising portion 17. At the same time, the front end portion rises obliquely upward and forward and is supported by the air cleaner box 39.

  Referring also to FIG. 2, the fuel tank 61 includes a front wall portion 62 extending in the vertical direction, an upper wall portion 63 disposed slightly rearward along the upper seat rail 15, and a lower seat rail. 16 has a lower wall portion 64 that is inclined more rapidly than the upper wall portion 63 and is rearwardly raised, and has a long triangular shape in the front-rear direction in a side view.

  Further, the fuel tank 61 is formed by forming a hollow monaca structure by integrally joining steel plate press parts forming the upper and lower parts thereof. The upper and lower dividing surfaces of the fuel tank 61 are provided with a slight curve so as to incline rearward from the lower side of the front wall portion 62 to the rear end portion and to protrude upward in a side view. The upper and lower half coupling flanges 65 of the fuel tank 61 are provided along the dividing surface.

  Referring to FIG. 3 as well, the fuel tank 61 has a rear portion with a wider left and right width than a front portion thereof. A driver seat for the front part of the seat 41 is located above the front part of the fuel tank 61, and as described above, the left and right widths of the front part of the fuel tank 61 are suppressed, so that the operation over the motorcycle 1 is performed. The tank capacity is increased by increasing the left and right widths of the rear part of the fuel tank 61 while improving the user's legibility. Reference numeral 65a in the figure denotes a cover locking portion provided in the fuel tank 61 so that the left and right side covers 51 can be attached to the vehicle body.

  Referring to FIG. 4 as well, a concave portion 66 is formed in the left and right intermediate portion of the lower side of the rear portion of the fuel tank 61 so as to secure a space for swinging upward of the rear wheel 7 located obliquely below and rearward thereof. Is done. The concave portion 66 is opened obliquely downward and rearward (toward the rear wheel 7 side) so that the rear wheel 7 can enter the inner side thereof, and extends along the outer periphery of the rear wheel 7 in a side view. The fuel tank 61 is curved so as to be convex upward and forward, and is provided so as to extend from the front lower side of the fuel tank 61 to the rear upper side. As a result, an open portion 67 having a U-shape as viewed from above is formed in the left and right intermediate portion of the upper wall portion 63 at the rear portion of the fuel tank 61 as viewed from above.

  As shown in FIGS. 2 and 3, a semi-disc-shaped upper fastening flange 68 is integrally formed at the front portion of the opening portion 67 so as to straddle the front end and both sides in a top view. The upper fastening flange 68 is disposed so as to rise rearward at a steep slope with respect to the upper wall portion 63, and its substantially central portion in the left-right direction serves as an upper fastening portion (fixed portion) 69 having a bolt hole. . An upper cross member 23 is provided between the left and right upper seat rails 15, and an upper fastening portion 69 is attached to an upper fastening seat 24 that protrudes downward from a substantially central portion in the left-right direction of the upper cross member 23. It is done.

  Referring to FIG. 5 together, the upper fastening portion 69 is substantially parallel to the upper fastening seat 24 of the upper cross member 23, and is disposed with a predetermined gap obliquely upward and forward. At this time, the rubber bush 71 fitted and attached to the upper fastening portion 69 and the collar 72 inserted into the rubber bush 71 abut on the upper surface of the upper fastening seat 24. In this state, the bolt 73 inserted into the collar 72 is tightened into the nut 74 on the lower surface side of the upper fastening seat 24 so that the upper rear side of the fuel tank 61 is elastically connected to the upper rear side of the seat frame 14 via the rubber bush 71. Supported.

  2, 3, and 4, left and right lower fastening stays 75 are integrally joined to the left and right sides of the lower wall portion 64 of the fuel tank 61 by welding or the like, respectively. Each of these lower fastening stays 75 is formed so that a plate-like lower fastening portion (fixed portion) 76 orthogonal to the left-right direction protrudes obliquely downward and rearward from the lower wall portion 64. The part 76 is attached to the lower fastening seat 25 on the inner side in the left-right direction in the left and right lower seat rails 16.

  Referring to FIG. 6 as well, the lower fastening portion 76 of the left lower fastening stay 75 is disposed with a predetermined gap inside the lower fastening seat 25 of the left lower seat rail 16 in the left-right direction. The lower fastening seat 25 is fixed, for example, by inserting a welding nut into the lower seat rail 16. At this time, the rubber bush 77 fitted and attached to the lower fastening portion 76 and the collar 78 inserted into the rubber bush 77 abut on the left and right inner surfaces of the lower fastening portion 76. In this state, by tightening the bolt 79 inserted into the collar 78 into the lower fastening seat 25, the lower portion of the fuel tank 61 is elastically supported by the lower portion of the seat frame 14 via the rubber bush 77. The structure of the right lower fastening stay 75 attached to the lower seat rail 16 on the right side is the same as described above, and the description thereof is omitted.

  2 and 3, the left lower fastening portion 76 and the lower fastening seat 25 are disposed below the rear portion of the fuel tank 61, and the right lower fastening portion 76 and the lower fastening seat 25 are disposed on the fuel tank 61. It is arrange | positioned in the front-back direction substantially center part lower side. The lower wall portion 64 of the fuel tank 61 is inclined rearwardly upward. Therefore, the left lower fastening portion 76 and the lower fastening seat 25 are positioned rearward and upward from the right lower fastening portion 76 and the lower fastening seat 25. ing.

Incidentally, an engaging portion 81 for the cushion bracket 22 in the cross member 21 of the main frame 11 is provided at a substantially central portion in the left-right direction of the front wall portion 62 of the fuel tank 61.
Referring to FIGS. 7, 8, and 9 together, the cushion bracket 22 is provided so as to protrude rearward from the cross member 21 with, for example, a U-shaped cross section that opens downward. The rear cushion 28 is connected to and supports the upper end portion of the rear cushion 28 immediately behind the tank, and further extends rearward from the rear cushion support position to form the tank support portion 84.

The tank support portion 84 has a triangular shape in a side view so as to narrow the rear vertical width while keeping the upper wall portion 86 substantially horizontal. The tank support portion 84 is covered with the tank support portion 84 and is made of rubber or the like. A rubber cushion 87 made of an elastic material is attached.
The rubber cushion 87 includes an upper wall portion 88 along the upper wall portion 85 of the tank support portion 84, both side wall portions 89 along the side wall portions 86, and a rear wall portion 88a against which the tip (rear end) of the tank support portion 84 abuts. It has. The upper wall portion 88 is relatively thick, and the upper wall portion 88 and the rear wall portion 88a are smoothly connected to each other through an R shape that protrudes obliquely rearward and upward in a side view.

  On the other hand, the engaging portion 81 is formed along the outer surface of the rubber cushion 87, and has an upper wall portion 82, both side wall portions 83, and a rear wall portion 82a. The rear wall portion 82a is a fuel. Joined to the front wall 62 of the tank 61 by welding or the like. The engaging portion 81 engages with the rubber cushion 87 mounted on the tank support portion 84 of the cushion bracket 22 so as to cover from above. At this time, both side wall portions 83 of the engaging portion 81 are in close contact with both side wall portions 89 of the rubber cushion 87, so that the front portion of the fuel tank 61 is positioned in the left-right direction and the upper wall portion of the rubber cushion 87. When the upper wall portion 82 of the engaging portion 81 is in close contact with the 88, the front portion of the fuel tank 61 is elastically supported on the rear portion of the cushion bracket 22 via the rubber cushion 87.

  At this time, a gap is formed between the rear wall portion 88a of the rubber cushion 87 and the rear wall portion 82a of the engaging portion 81 (the front wall portion 62 of the fuel tank 61). It is possible to tolerate misalignment. The front wall portion 62 of the fuel tank 61 contributes to an increase in tank capacity by projecting the left side portion forward, while the right side portion is recessed rearward so as to secure an arrangement space for auxiliary equipment (not shown). It is out.

  Here, as shown in FIG. 3, the left and right width of the front portion of the fuel tank 61 is substantially the same as the left and right width of the seat frame 14, while the left and right width of the rear portion of the fuel tank 61 is the same as the left and right width of the seat frame 14. It is supposed to exceed. The left-right width of the seat frame 14 is the width between the outer sides of the left and right lower seat rails 16 and is also the width between the outer sides of the left and right upper seat rails 15 in this embodiment. As a result, the left and right sides of the rear portion of the fuel tank 61 are located on the left and right outer sides (in other words, the left and right outer sides of the space K) with respect to the left and right sides of the seat frame 14 (left and right upper and lower seat rails 15 and 16).

  2 and 4, the left and right sides of the lower wall portion 64 at the rear portion of the fuel tank 61 protrude downward so as to overlap with the left and right outer sides of the lower seat rail 16 in a side view. An overhang portion 91 is provided. These left and right projecting portions 91 contribute to an increase in tank capacity, and are provided so that the left and right inner sides thereof are close to the left and right outer sides of the lower seat rail 16, thereby allowing the rear portion of the fuel tank 61 to move in the left and right directions. regulate. A left lower fastening stay 75 is disposed on the left side inward of the left overhanging portion 91 (inward in the left and right direction of the left lower seat rail 16). The left lower seat rail 16 is disposed between the overhanging portion 91.

The fuel tank 61 having the above configuration is first assembled to the seat frame 14 and then attached to the main frame 11 together with the seat frame 14.
Specifically, first, the fuel tank 61 is set between the upper and lower seat rails 15 and 16 from the front of the seat frame 14 in a state of being removed from the main frame 11. At this time, the upper fastening portion 69 and the upper fastening seat 24 are opposed to each other on the upper rear side of the fuel tank 61, and the lower fastening stay 75 and the lower fastening seat on the left side at the substantially central portion in the front-rear direction on the lower left side of the fuel tank 61. The fuel tank 61 is positioned with respect to the seat frame 14 so that the right lower fastening stay 75 and the lower fastening seat 25 are opposed to each other at the rear portion of the lower right side of the fuel tank 61.

  At this time, the left and right sides of the rear portion of the fuel tank 61 protrude outwardly from the left and right between the upper and lower seat rails 15 and 16, and the rear end portions of the upper and lower seat rails 15 and 16 are joined together and joined together. The fuel tank 61 is restricted from moving in the vertical direction and the rearward direction with respect to the seat frame 14. In addition, since the left and right projecting portions 91 at the rear of the fuel tank 61 are disposed close to the left and right outer sides of the left and right lower seat rails 16, the movement of the fuel tank 61 relative to the seat frame 14 in the left and right direction is restricted.

That is, the fuel tank 61 can be removed only toward the front of the seat frame 14 (the side connected to the main frame 11) with the bolts 73 and 79 removed.
In this state, the fuel tank 61 is attached to the seat frame 14 by attaching the fastening portions 69 and 76 of the fuel tank 61 to the fastening seats 24 and 25 of the seat frame 14 via the rubber bushes 71 and 77 as described above. Rubber mounted.

  When the fuel tank 61 is assembled to the seat frame 14 in this way and then attached to the main frame 11, first, the front end portions of the seat frame 14 and the connecting portions 18 and 19 of the main frame 11 Are set with respect to the main frame 11 so that they overlap each other in the left-right direction. At this time, the engaging portion 81 of the fuel tank 61 is engaged with the rubber cushion 87 attached to the tank support portion 84 of the main frame 11, so that the front portion of the fuel tank 61 is positioned in the left-right direction with respect to the main frame 11. And the front portion of the fuel tank 61 is elastically supported by the main frame 11.

  In this state, the seat frame 14 and the main frame 11 are integrally connected by fastening the front end portions of the seat frame 14 and the connecting portions 18 and 19 of the main frame 11 with bolts along the left-right direction. At the same time, a fuel tank 61 is disposed in a space K surrounded by the seat frame 14 and the main frame 11. At this time, the fuel tank 61 is attached to the main frame 11 only by engaging the engaging portion 81.

As described above, in the fuel tank support structure in the above embodiment, the seat frame 14 that supports the seat 41 is detachably attached to the rear of the main frame 11 that supports the engine 31, and the main frame 11, the seat frame 14, Applied to the motorcycle 1 in which the fuel tank 61 is disposed in the space K surrounded by the fuel tank 61. The fuel tank 61 includes fastening portions 69 and 76 for the seat frame 14 and the main frame 11. It has the engaging part 81 with respect to.
According to this configuration, only by engaging the engagement portion 81 of the fuel tank 61 with the main frame 11, a part of the fuel tank 61 can be supported by the main frame 11, so that the fuel tank 61 is fastened to the seat frame 14. The number of locations can be reduced, and the fuel tank 61 can be easily attached.

  In the fuel tank support structure, a cushion bracket 22 that supports the upper end portion of the rear cushion 28 is provided at the rear portion of the main frame 11, and the engagement portion 81 is engaged with the cushion bracket 22, thereby The cushion bracket 22 is also used as the mating part of the joint portion 81, and the number of parts can be reduced.

  Further, in the fuel tank support structure, the engaging portion 81 is provided at the front portion of the fuel tank 61, and the fastening portions 69 and 76 are substantially at the center in the front-rear direction of the fuel tank 61 and at the rear thereof. The front part of the fuel tank 61 is supported by the vehicle body frame 5 via the engaging part 81, and the seat frame 14 is provided only in the substantially central part and the rear part of the fuel tank 61 in the front-rear direction. Since it will be sufficient to support, the fastening location of the fuel tank 61 and the seat frame 14 can be reduced.

  In addition, in the fuel tank support structure, the seat frame 14 includes a pair of left and right upper seat rails 15 and a lower seat rail 16, and a rear portion of the fuel tank 61 with respect to the left lower seat rail 16. By providing the lower fastening portion 76 and providing the rear wheel drive mechanism below the lower fastening portion 76, the drive chain 37 and the like disposed on the lower left side of the seat frame 14 can swing the swing arm 8 up and down. Even when close to the front part of the seat frame 14 that is sometimes lowered forward, the lower fastening part 76 with respect to the left lower seat rail 16 is positioned at the rear part of the fuel tank 61, so that the lower fastening part 76 is connected to the drive chain 37 and the like. Since it becomes difficult to approach, the layout freedom of each component can be improved.

  In the fuel tank support structure, the fuel tank 61 is fastened to the seat frame 14 via the rubber bushes 71 and 77 and is engaged with the main frame 11 via the rubber cushion 87. Thus, the fuel tank 61 can be a rubber mount with respect to both the main frame 11 and the seat frame 14.

  Furthermore, in the fuel tank support structure, the fuel tank 61 and the seat frame 14 with respect to the main frame 11 are attached to the main frame 11 after the fuel tank 61 is assembled integrally with the seat frame 14. As a result, the number of work steps in the production line can be reduced. In addition, since the engaging portion 81 plays a role of positioning, an operation such as fastening the seat frame 14 to the main frame 11 can be facilitated without using a special jig or the like.

1 is a side view of a motorcycle according to an embodiment of the present invention. FIG. 2 is a side view of the vicinity of a fuel tank disposed under a seat of the motorcycle. It is a top view of the fuel tank. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is a principal part enlarged view of FIG. FIG. 5 is an enlarged view of the vicinity of the engaging portion of the front portion of the fuel tank. It is CC sectional drawing of FIG. It is the perspective view which looked at the said engaging part periphery from diagonally forward.

Explanation of symbols

1 Motorcycle 11 Main frame 14 Seat frame 15 Upper seat rail 16 Lower seat rail 22 Cushion bracket (bracket)
28 Rear cushion 31 Engine 37 Drive chain (rear wheel drive mechanism)
41 Seat 61 Fuel tank 69 Upper fastening part (fixing part)
71 Rubber bush (Rubber)
76 Lower fastening part (fixed part)
77 Rubber Bush (Rubber)
81 Engagement section 87 Rubber cushion (rubber)
K space

Claims (3)

A seat frame (14) that supports the seat (41 ) is detachably attached to the rear of the main frame (11 ) that supports the engine (31) , and is surrounded by the main frame (11) and the seat frame (14) . In the fuel tank support structure of the motorcycle (1) in which the fuel tank (61) is disposed in the space (K) ,
The fuel tank (61) is, the fixing part relative to the seat frame (14) and having a (69,76), possess engaging portion (81) relative to said main frame (11),
The engaging portion (81) is provided at the front portion of the fuel tank (61), and the engaging portion (81) supports the upper end portion of the rear cushion (28) at the rear portion of the main frame (11). Engaging the bracket (22) through the rubber (87),
The seat frame (14) has a pair of left and right upper seat rails (15) and a lower seat rail (16),
The fixing part (69, 76) includes an upper fastening part (69) and a lower fastening part (76), which are provided at at least one of the front and rear direction substantially center of the fuel tank (61) and the rear part thereof. And
The upper fastening portion (69) is provided at a substantially central portion in the left-right direction of the fuel tank (61), and an upper cross member (23) between the pair of left and right upper seat rails (15) via a rubber (71). Fastened and fixed
The lower fastening portions (76) are provided on the left and right sides of the lower portion of the fuel tank (61), and are fastened and fixed to the left and right lower seat rails (16) via rubbers (77), respectively.
A rear wheel drive mechanism (37) is provided below the lower fastening portion (76) located on the rear side of the fuel tank (61),
A fuel tank for a motorcycle, wherein a concave portion (66) for securing a swinging space upward of the rear wheel (7) is formed in a left and right middle portion of the fuel tank (61) below the rear portion. Support structure. The engaging portion (81), after the fuel tank (61) is fixed to said seat frame (14), when said seat frame (14) is fixed to the main frame (11), said bracket The fuel tank support structure for a motorcycle according to claim 1 , wherein the fuel tank support structure can be engaged with (22) . The fuel tank support structure for a motorcycle according to claim 1 or 2, wherein the fuel tank (61) is provided with a cover locking portion (65a) for attaching the left and right side covers (51) to the vehicle body. .

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