JP2777580B2 - Motorcycle fuel tank mounting device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a fuel tank mounting device for a motorcycle. [Prior Art] In a motorcycle in which a fuel tank is mounted on a main pipe extending rearward from a steering head pipe, conventionally, as seen in, for example, Japanese Utility Model Publication No. 59-23484, It is known that an escape recess is formed over the main pipe, and the fuel tank is placed over the main pipe. This type of fuel tank hooks and holds two places on the lower left and right of the front end of the escape recess around the down tube,
The rear end of the escape recess is fixed to the rear end of the main pipe or a seat rail connected to the main pipe by bolting. [Problems to be Solved by the Invention] However, according to this conventional fixing structure, the upper front end of the escape recess simply straddles the main pipe,
Since there is a gap between them, for example, when the size of the fuel tank is increased to increase the capacity, the load burden on the support portions before and after the fuel tank increases, and the support strength may be insufficient. For this reason, the fuel tank may fluctuate,
There is a problem that the mounting posture with respect to the main pipe becomes unstable. The present invention has been made in view of such circumstances, and can stably support a fuel tank, and furthermore, despite the fact that an air cleaner is disposed inside the escape recess of the fuel tank, this air cleaner has It is an object of the present invention to provide a motorcycle fuel tank mounting device that can prevent a load on a fuel tank from being applied. Means for Solving the Problems To achieve the above object, the present invention provides a frame having a main pipe extending rearward from a steering head pipe and a down tube extending downward, and a fuel tank supported by the frame. The fuel tank is opened downward, has a relief recess through which the main pipe is inserted, and inside the relief recess, an air cleaner that extends upward across the main pipe is provided. A rear end connecting portion is provided at the rear end of the escape recess so as to be detachably connected to the frame, and a front end is detachably connected to the frame at both left and right sides of the front end of the escape recess. In a motorcycle provided with a connecting portion, the front end both side surfaces of the fuel tank are integrally extended forward, and An escape recess of the side extension portion covers the side of the steering head pipe, and an interval is provided to avoid the rotation trajectory of the front fork. At the front of the main pipe, the escape recess is provided in front of the air cleaner. A load receiving portion facing the ceiling surface of the front end is provided.The load receiving portion is formed by an adjust bolt provided on the main pipe, a support member integrated with the adjust bolt, and a lock nut screwed with the adjust bolt. A height adjusting member, and a receiving seat having a lower surface extending downward from a front end of a ceiling surface of the escape recess and abutting against an upper surface of the support member; and a front end connecting portion of the escape recess. Is located at a position lower than the rear end connecting portion of the escape recess and in front of the down tube. It must be a vehicle fuel tank mounting device. [Operation] According to this configuration, the tank support member of the load receiving portion is
Since the main pipe can be moved in the vertical direction via a height adjusting member, the height of the tank support member is adjusted while the relief recess of the fuel tank is placed on the main pipe, and the tank support member is recessed. By contacting a receiving seat projecting downward from the ceiling surface of the fuel tank, the load on the fuel tank can be received by the main pipe ahead of the air cleaner. Moreover, the front end connecting portion of the escape recess is located at a lower position than the rear end connecting portion,
The front portion of the fuel tank is supported by the frame at a position vertically separated from the frame. For this reason, the fuel tank
The frame is supported at a total of three places separated from each other, so that the load burden on the front end connection part and the rear end connection part of the escape recess is reduced as compared with the conventional case, and the supporting strength of the fuel tank is sufficiently ensured Can be. In addition, since the height of the tank support member of the load receiving part can be adjusted to the upper and lower bones, the positional relationship between the main pipe and the fuel tank may be changed in the vertical This variation can be absorbed even if it varies. Therefore, the fuel tank can be reliably supported by the frame, and the mounting posture of the fuel tank is stabilized. Further, according to the above configuration, the ceiling surface of the escape recess of the fuel tank is supported from below by the load receiving portion in front of the air cleaner, so that even if the ceiling surface of the escape recess contacts the air cleaner, the fuel tank is attached to the air cleaner. Can be prevented from being applied. Therefore, it is possible to prevent the air cleaner from being deformed or damaged even though the air cleaner is arranged inside the escape recess. In addition, the front end both sides of the fuel tank are integrally extended forward, and the escape recesses of these front extensions cover the sides of the steering head pipe, so that the fuel tank can be made larger and moreover, Since the down tube is used as a front end support point (front end connecting portion) of the escape recess and is supported at the front side of the down tube, the mounting support can be performed simply, reliably and stably. Furthermore, since the front end sides of the escape recesses, which are integrally extended forward so as to cover the sides of the steering head pipe, are provided with a space so as to avoid the rotation trajectory of the front fork, the height is increased even if this space is used. The adjust bolt can be operated for adjustment. Embodiment The present invention will be described below based on an embodiment shown in the drawings. In the figure, reference numeral 1 denotes a frame, and a front fork 3 is pivotally supported on a steering head pipe 2 at the front end. One main pipe 4 extending backward and a down tube 5 extending downward are welded to the steering head pipe 2, and right and left seat rails 7 supporting the seat 6 are provided at the rear end of the main pipe 4. Welded. Left and right seat pillar tubes 8 extending downward are welded to the rear end of the main pipe 4.
An engine 9 is supported between the seat pillar tube 8 and the down tube 5. The main pipe 4 extends above and below the engine 9 in the front-rear direction.
10 are installed. The fuel tank 10 includes an outer panel 11 forming an outer shape thereof, and an inner panel 12 closing a lower surface of the outer panel 11. This fuel tank 10 has an escape recess opened downward.
It has thirteen. The escape recess 13 is formed in the inner panel 12. The escape recess 13 extends in the front-rear direction along the main pipe 4, and the main pipe 4 and the down tube 5 are inserted and arranged inside the escape recess 13. Therefore, the fuel tank 10 is disposed so as to straddle the main pipe 4. The width of the escape recess 13 is formed wider than the width of the cylinder 9a of the engine 9 as shown in FIG. 4, and an air cleaner 15 connected to the carburetor 14 is provided in a space inside the escape recess 13. Is housed. The air cleaner 15 straddles the main pipe 4 and projects above the main pipe 4. Then, as shown in FIG. 1, the upper surface of the air cleaner 15
It is in contact with the ceiling surface 13a of the escape recess 13 via a buffer member 15a such as rubber or sponge. The left and right sides of the fuel tank 10 defined by the escape recess 13 extend downward as shown in FIGS. 4 and 5, and these lower extensions 16 cover the left and right sides of the cylinder 9a. . In addition, both sides of the front end of the fuel tank 10 including the lower extension 16 are integrally extended forward as shown in FIG. It reaches to the side of the steering head pipe 2 avoiding the moving trajectory. Therefore, the appearance of the fuel tank 10 of the present embodiment is extremely large, which is one of the features of the appearance of the motorcycle. The front upper part of the front fork 3 is covered with a cowling 18 made of synthetic resin. This cowling 18
The right and left sides of the front fork 3 extend rearward through the outside of the front fork 3. The extension of the cowling 18 is a side panel 19 that covers the upper part of the front fork 3 from the side.
Has made. The side panel 19 extends sideward in a smooth curve as it goes backward, and its rear end is bolted to the outer surface of the front extension 17 of the fuel tank 10 to be integrated with the fuel tank 10. It is connected. Next, the mounting structure of the fuel tank 10 will be described. That is, as shown in FIGS. 1 and 3, a crossbar 20 as a rear end connecting portion is provided between the opposing inner surfaces of the rear end portion of the escape recess 13. Crossbar 20
Is a rear bracket 21 straddling the front end of the seat rail 7
A pair of left and right bosses 23 projecting through the crossbar 20 and the first damper 22 project from the upper surface of the rear bracket 21 on the upper surface of the rear bracket 21 via a first damper 22 made of rubber. Have been. A ring-shaped rubber second damper 24 and a washer 25 are mounted on the outer periphery of the penetrating end of the boss portion 23. When the washer 25 is tightened with a bolt 26 screwed into the boss portion 23, the cross Bar 20 is damper 22,
24, and is elastically held by the rear bracket 21. Also, as shown in FIG. 1 and FIG.
A support pipe 28 extending in the left-right direction via a bracket 27 is welded to an upper portion of the down tube 5 that enters the front end of the down tube 5. The left and right ends of the support pipe 28 are close to the opposing inner surfaces at the lower front end of the escape recess 13, and rubber dampers 29 are fixed to the left and right ends. A pair of left and right locking metal fittings 30 as a front end connecting part is welded to the inner surface of the lower front end of the escape recess 13. These locking fittings 30 are arranged at positions corresponding to the lower extension 16 of the fuel tank 10, and are arranged at a position lower than the cross bar 20 at the rear end of the fuel tank 10. These locking fittings
30 is provided with a fitting concave portion 31 which opens forward and has a side surface facing the damper 29 opened.
The damper 29 is fitted into the inside from the front. In this case, the damper 29 is fitted into the fitting concave portion 31 without any gap in the vertical and horizontal directions, thereby restricting the movement of the front end of the fuel tank 10 in the vertical and horizontal directions. A support stay is provided on the upper surface of the front end of the main pipe 4.
A front bracket 33 is welded through 32. The front bracket 33 has a flat plate shape extending in the left-right direction, and faces the front end of the ceiling surface 13a of the escape recess 3. A pair of right and left just bolts 34 as height adjusting members are inserted into the front bracket 33 along the up-down direction. These adjustment bolts 34 are screwed into nuts 37 welded to the lower surface of the front bracket 33. A rubber tank support member 35 is integrally fixed to the upper end of the adjustment bolt 34 by baking.
The tank support member 35 has a disk shape and is configured to rotate integrally with the adjustment bolt 34. Therefore, when the tank support member 35 is rotated, the adjustment bolt 34 rotates integrally and moves up and down, so that the height of the tank support member 35 with respect to the main pipe 4 can be adjusted. The vertical positioning of the support member 35 is performed by tightening a lock nut 36 screwed into the just bolt 34. Lock nut
The support member 35 has a disk shape larger in diameter than the support member 35, and the support member 35 and the lock nut 36 are formed between the upper end of the front end of the fuel tank 10 and the steering head pipe 2 as shown in FIG. It is exposed to the outside through the gap between them. A receiving seat 38 projecting downward is welded to the front end of the ceiling surface 13a of the escape recess 13. The lower surface of the receiving seat 38 is formed flat.
Are in contact with each other. Therefore, the support member 35
Is in contact with the receiving seat 38 from below, and in the case of the present embodiment, the receiving seat, the tank support member 35, the adjusting bolt 34, and the like constitute a load receiving portion that supports the upper front end of the fuel tank 10. In the case of this embodiment, as shown in FIG. 7, the bracket 40 welded to the right seat pillar tube 8 includes:
A reservoir tank 41 of a rear wheel hydraulic disc brake (not shown) is fastened and fixed via screws 42. This reservoir tank 41 is not covered with the side cover 43 or the like, but is exposed to the outside as it is.
The cover 44 is covered with an anti-theft cover 45. cover
As shown in FIG. 8, 45 has a plurality of locking tongues 46 which cover a finger-holding recess 47 provided on the outer peripheral surface of the cap 44, and the cover 45 is attached to the bracket 40 via the screw 42. They are tightened together. In such a configuration, to mount the fuel tank 10 on the main pipe 4, first, cover the fuel tank 10 from above the rear of the main pipe 4, and
Insert into 13. At this time, by gradually shifting the fuel tank 10 forward, the damper 29 on the frame 1 side is inserted into the fitting concave portion 31 of the locking metal fitting 30, and the lower end of the front end of the fuel tank 10 is positioned in the vertical and horizontal directions. . Thereafter, the cross bar 20 at the rear end of the escape recess 13 is overlapped with the rear bracket 21 and tightened and fixed with bolts 26. Next, a hand is inserted from between the upper edge of the front end of the fuel tank 10 and the steering head pipe 2, and the support member is
The height of the support member 35 is adjusted by rotating the support member 35, and the upper surface of the support member 35 contacts the lower surface of the seat 38. Then, if the position of the support member 35 is fixed by tightening the lock nut 36, the fuel tank 10 is supported by the frame 1 at a total of three places: an upper part, a lower part, and a rear end of the front end. The installation of the tank 10 is completed. According to such an embodiment of the present invention, the tank support member 35 is provided on the upper surface of the front part of the main pipe 4 so as to be in contact with the ceiling surface 13a of the escape recess 13 from below. Can be received by the main pipe 4. In addition, since the latch 30 located at the lower front end of the fuel tank 10 is located at a position lower than the crossbar 20 located at the rear end of the fuel tank 10,
The front part of the fuel tank 10 is supported by the frame 1 at a position vertically separated from the front part of the fuel tank 10, so that the lower extension 16 of the fuel tank 10 extended downward can be reliably supported by the down tube 5 of the frame 1. it can. Therefore, the fuel tank 10 is supported by the frame 1 at a total of three places, that is, an upper part, a lower part, and a rear end of the front end thereof. Can be reduced. Therefore, the supporting strength of the fuel tank 10 can be sufficiently ensured, and the mounting posture of the fuel tank 10 with respect to the nine pipe 4 is stabilized. Moreover, a support member 35 supporting the ceiling surface 13a of the escape recess 13
Since the height can be adjusted, even if the position between the fuel tank 10 and the main pipe 4 varies due to, for example, dimension crossing or assembling error at the time of assembling the fuel tank 10 or the frame 1, this variation can be achieved. Therefore, the load on the upper front end of the fuel tank 10 can be reliably received. In particular, in the case of the present embodiment, the lower portion of the front end of the fuel tank 10 is restrained from moving in the vertical direction by the engagement of the locking metal fitting 30 and the damper 29. Since the dimensions between the upper surface and the ceiling surface 13a of the escape recess 13 are likely to vary, if the height of the support member 35 is adjustable as described above, the support member 35 can be securely received. The fact that it can be brought into contact with 38 has the advantage that the dimensions of the fuel tank 10 and the frame 1 can be easily controlled. Further, even in a state where the lower front end and the rear end of the escape recess 13 are connected to the frame 1, if the support member 35 is brought into contact with the receiving seat 38 and the ceiling surface 13a of the escape recess 13 is pushed upward, Since the dampers 29 fitted to the metal fittings 30 and the dampers 22 and 24 sandwiching the crossbar 20 are deformed to some extent, the mounting position of the fuel tank 10 with respect to the main pipe 4 can be finely adjusted. Therefore, the positioning between the fuel tank 10 and the main pipe 4 can be accurately performed. Further, according to the above configuration, since the load on the upper front end of the fuel tank 10 is received by the main pipe 4,
Although the upper surface of the air cleaner 15 is in contact with the ceiling surface 13a of the escape recess 13 of the fuel tank 10 via the buffer member 15a, it is possible to prevent the load of the fuel tank 10 from being applied to the air cleaner 15. Therefore, the escape recess 13 of the fuel tank 10
Although the air cleaner 15 is housed inside the air cleaner, the deformation of the air cleaner 15 can be prevented. At the same time, in the present embodiment, the rear end of the side panel 19 of the cowling 18 is directly bolted to the fuel tank 10, so if the mounting position of the fuel tank 10 can be finely adjusted as described above, Positioning with the cowling 18 can be performed with high accuracy, which is convenient for enhancing the appearance. According to the present invention described above, the load on the front end of the fuel tank can be received by the main pipe, and the front of the fuel tank is supported by the frame at a position vertically separated. Therefore, the fuel tank will be supported by the frame at a total of three points, the upper and lower front ends, and the rear end of the frame, thereby reducing the load on the front and rear connecting parts of the fuel tank. Can be reduced. Therefore, the supporting strength of the fuel tank can be sufficiently ensured, and the mounting posture of the fuel tank is stabilized. Further, the front end both side surfaces of the fuel tank are integrally extended forward, and the escape recesses of these front extension portions cover the sides of the steering head pipe. Since the down tube is used as a part and is supported at the front side of the down tube, the size of the fuel tank can be increased, and its front end can be supported simply, reliably and stably. Moreover, since the load on the upper front end of the fuel tank is received by the main pipe as described above, even if the upper surface of the air cleaner is in contact with the escape recess of the fuel tank,
It is possible to prevent the load of the fuel tank from being applied to the air cleaner. For this reason, there is an advantage that the air cleaner can be prevented from being deformed even though the air cleaner is housed inside the escape concave portion of the fuel tank.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention, FIG. 1 is a cross-sectional view showing a mounting portion of a fuel tank, FIG. 2 is a view taken in the direction of the line II in FIG. 3 is a sectional view taken along the line III-III in FIG. 1, FIG. 4 is a sectional view of the fuel tank, FIG. 5 is a side view of the motorcycle, FIG. 6 is a plan view of the motorcycle, FIG. FIG. 8 is a side view of a mounting portion of the reservoir tank, and FIG. 8 is a plan view of a cover. In the drawing, 1 ... frame, 2 ... steering head pipe, 4 ... main pipe, 10 ... fuel tank, 13 ... recess recess, 15 ... air cleaner, 20 ... rear end connecting part (crossbar), 30 ... front end connecting part (locking fitting), 34 ... height adjustment member (adjustment bolt), 35 ... tank support member.

Claims (1)

(57) [Claims] A frame having a main pipe extending rearward from a steering head pipe and a down tube extending downward, and a fuel tank supported by the frame, wherein the fuel tank is opened downward and the main pipe is opened. An air cleaner extending upward across the main pipe is disposed inside the escape recess, and is detachably connected to the frame at a rear end of the escape recess. A motorcycle provided with a rear end connecting portion, and having a front end connecting portion detachably connected to the frame on both left and right sides of a front end portion of the relief recess, wherein the front end both side surfaces of the fuel tank face forward. It is extended integrally so that the escape recesses of these front extensions cover the sides of the steering head pipe. A space is provided to avoid the rotation locus of the front fork, and a load receiving portion is provided at a front portion of the main pipe in front of the air cleaner so as to face a ceiling surface of a front end of the relief recess. A height adjustment member comprising an adjustment bolt provided on the pipe, a support member integral with the adjustment bolt, and a lock nut screwed onto the adjustment bolt, and extending downward from the front end of the ceiling surface of the relief recess. A receiving seat having a lower surface abutting on an upper surface of the support member, and a front end connecting portion of the escape recess is located at a position lower than a rear end connecting portion of the escape recess and in front of the down tube. A fuel tank mounting device for a motorcycle, wherein the fuel tank mounting device is disposed.