JP3704988B2 - Motorcycle fuel tank mounting structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention particularly relates to a fuel tank mounting structure for a motorcycle for mounting a fuel tank made of synthetic resin to a vehicle body frame.
[0002]
[Prior art]
In recent years, in order to liberalize the shape and design of the fuel tank, motorcycles in which the fuel tank is integrally formed of synthetic resin are increasing. As a structure for attaching such a synthetic resin fuel tank to the body frame of a motorcycle, a tongue fastening portion formed on the front and rear ends of the fuel tank is provided with a tank fastening portion (bracket) provided on the body frame. Etc.) is generally fastened with a screw through a cushioning material.
[0003]
[Problems to be solved by the invention]
However, since at least two fixing points as described above are provided in the fuel tank, at least two sets of parts such as screws, washers, spacers, and cushioning materials are required, increasing the number of parts and assembly. It is cumbersome and labor-intensive, and the manufacturing cost of the motorcycle is disadvantageous.
[0004]
In addition, it is necessary to provide at least two tank fastening parts on the body frame, but if the relative positional accuracy is poor, it becomes impossible to mount the fuel tank. Is extremely disadvantageous.
[0005]
The motorcycle fuel tank mounting structure according to the present invention has been made to solve the above-mentioned problems, and its first object is to easily attach the fuel tank to the vehicle body side with a small number of parts and a simple structure. It is possible to reduce the manufacturing cost of the motorcycle by reducing the working accuracy of the body frame related to the mounting of the fuel tank.
[0008]
A second object of the fuel tank mounting structure for a motorcycle according to the present invention is to enable the fuel tank to be stably fixed with a minimum fixing portion.
[0009]
A third object of the fuel tank mounting structure for a motorcycle according to the present invention is to prevent the resonance to the vehicle body vibration by fixing each part of the fuel tank in a vibration-proof manner and to prevent the generation of abnormal noise. is there.
[0010]
[Means for Solving the Problems]
In order to achieve the first object, according to the motorcycle fuel tank mounting structure of the present invention, as described in claim 1, one fixing point of the fuel tank is fastened with a screw to a tank fastening portion of the vehicle body frame. And the other fixing point of the fuel tank is hooked to the tank holding portion of the vehicle body frame, and the fixing point is in contact with and separated from the tank fixing portion in plan view. A latch fixing portion that is slidably held only in the direction in which the fuel tank is slid , and the fastening fixing portion is disposed on the front side of the fuel tank, the latch fixing portion is disposed on the rear side of the fuel tank, and the rear of the fuel tank. The side latch fixing part is configured by providing the tank holding part with a pair of left and right tank stoppers on a cross member extending in the vehicle width direction, while extending the fixing point in the longitudinal direction of the vehicle body. One end is shaped with an indentation which is open Te, characterized in that the indented portion constituted by hooked from the front and rear direction to the cross member between the left and right tank stopper of the tank holder.
[0015]
Similarly, in order to achieve the second object, a fuel tank mounting structure for a motorcycle according to the present invention includes an anti-vibration holding portion for supporting the fuel tank on the vehicle body frame in an anti-vibration manner as described in claim 2. The cushion member is provided in the vicinity of the latch fixing portion, and the cushion member is interposed between the cushion member of the vibration-proof holding portion and a fixing point in the latch fixing portion and a pair of left and right stoppers of the tank holding portion. And integrated.
[0016]
Furthermore, in order to achieve the third object, a fuel tank mounting structure for a motorcycle according to the present invention is as described in claim 3 , wherein the fastening and fixing portion is provided between the fixing point and the tank fastening portion. A cushion member is interposed between the fixing point and the tank holding portion in the latch fixing portion.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of the entire left side of a scooter type motorcycle to which an embodiment of a fuel tank mounting structure according to the present invention is applied, and FIG. 2 shows the vicinity of a fuel tank installation portion of the motorcycle shown in FIG. 3 is an enlarged left side view, FIG. 3 is also a plan view, and FIG. 4 is a perspective view as seen obliquely from the upper left.
[0019]
The body frame 2 of the motorcycle 1 is configured by combining, for example, steel pipes. A pair of left and right lower pipes 4 extend downward from the head pipe 3 installed at the front head while entering the lower portion of the pipe, and a pair of left and right upper pipes 5 extend rearward from the vicinity of the front end of the lower pipe 4. The rear ends of the left and right lower pipes 4 bend upward and are respectively connected to the middle portions of the left and right upper pipes 5. The lower pipes 4 are connected by three cross members 6, 7, 8 extending in the vehicle width direction.
[0020]
The foremost cross member 6 is connected to the left and right upper pipes 5 by a pair of left and right bridge members 9, and a seat bridge 11 is installed between the upper pipes 5. Further, an engine suspension bracket 12 is provided at an intermediate portion of the upper pipe 5. Further, the rear portions of the left and right upper pipes 5 are connected by bridge members 13 and 14. In the horizontal portion of the left and right lower pipes 4, a step plate 15 is provided on the outside, a tank holding plate 16 is provided on the inside, and a stand bracket 17 is provided only on the left lower pipe 4.
[0021]
A front fork 21 that supports the front wheel 20 is pivotally supported on the head pipe 3 of the vehicle body frame 2 configured in this manner together with a handlebar 22 and the like so as to be able to turn left and right. A power unit 23 swings up and down on the engine suspension bracket 12. It is connected freely. The power unit 23 is well-known for a scooter in which an engine 24 and a drive unit 25 (power transmission device) are integrally formed. The shock absorber 27 is connected to the vicinity of the rear part.
[0022]
A seating seat 29 is installed above the power unit 23, and a space below the seating seat 29 is partitioned into a front accessory chamber 31 and a rear article storage chamber 32 with the bridge member 30 as a boundary. The seat 29 can open upward with the top of the seat bridge 11 as a fulcrum, and serves as a lid for the auxiliary machine room 31 and the article storage room 32. The auxiliary machine room 31 accommodates the carburetor 33 and the air cleaner 34 of the engine 24, and the article storage room 32 has a volume capable of storing an article such as a helmet. A radiator 35 for cooling the engine 24 is installed below the front part of the body frame 2.
[0023]
A fuel tank 38 is installed in a space formed in a cage shape surrounded by the left and right upper pipes 5 and the lower pipe 4 of the body frame 2. 5 and 6 are a left side view and a plan view of the fuel tank 38 alone. The fuel tank 38 is integrally formed by a synthetic resin molding method such as blow molding, and fixing points 39 and 40 are integrally formed on the front surface and the rear surface of the bottom surface, respectively. The fuel supply port 41 and the fuel gauge mounting port 42 are formed on the upper surface. Is provided. The fuel supply port 41 is closed with a cap 43, and a fuel gauge 44 is attached to the fuel gauge attachment port 42. A fuel supply tray 45 is installed around the fuel gauge attachment port 42 (see FIG. 2). Further, a fuel hose 47 is connected to a fuel outlet 46 provided behind the fixed point 40 (see FIG. 3), and the other end is connected to a fuel pump (not shown).
[0024]
As shown in FIGS. 1 to 3, the fuel tank 38 is fixed to the vehicle body frame 2 at two locations: a front fastening fixing portion A and a rear locking fixing portion B. In the fastening and fixing portion A, the fixing point 39 on the front side of the fuel tank 38 is fastened to the tank fastening portion 49 of the vehicle body frame 2 with a screw 50, and in the latching and fixing portion B, the fixing point 40 on the rear side of the fuel tank 38 is The tank holding portion 51 is hooked.
[0025]
First, the structure of the fastening and fixing portion A will be described. A fixing point 39 on the front side of the fuel tank 38 is formed in a tongue shape along the center plane of the vehicle body, and an attachment hole 53 is formed. On the other hand, the tank fastening portion 49 of the vehicle body frame 2 is one in which two upper and lower nut bosses 54 are fixed to the right side surface of the right bridge member 9, for example, as shown in FIGS. A front tank bracket 55 is fastened to the tank fastening portion 49.
[0026]
The front tank bracket 55 corresponds to the connecting member described in claim 2, and is formed in a substantially “U” shape in a plan view by press-molding a sheet metal material, for example, as shown in an enlarged view in FIGS. The frame fastening piece 56 and the tank fastening piece 57 that face each other are provided. Two upper and lower screw insertion holes 58 are formed in the frame fastening piece 56, and one screw insertion hole 59 is formed in the tank fastening piece 57, and a nut member 60 is fixed to the back side thereof.
[0027]
As shown in FIG. 9, the frame fastening piece 56 of the front tank bracket 55 is applied to the tank fastening portion 49 (nut boss 54), and the screw 61 is inserted into the screw insertion hole 58 and fastened to the nut boss 54. In addition, a grommet-like cushion member 63 and a spacer pipe 64 are fitted into the mounting hole 53 of the fixing point 39 of the fuel tank 38, and the cushion member 63 is applied to the tank fastening piece 57 of the front tank bracket 55, and the cushion A washer 65 is applied to the opposite side of the member 63. Then, the screw 50 is inserted through the washer 65 and the spacer pipe 64 and fastened to the nut member 60 of the tank fastening piece 57.
[0028]
Thus, in the fastening and fixing portion A, the fixing point 39 of the fuel tank 38 is fixed to the tank fastening portion 49 of the vehicle body frame 2 via the front tank bracket 55. The fixing point 39 is held in a vibration-proof manner with respect to the front tank bracket 55 by the elasticity of the cushion member 63. By the way, the strength of the front tank bracket 55 is set so that the fuel tank 38 can be sufficiently held in a normal state, and the front tank bracket 55 is deformed when a large load exceeding the holding load of the fuel tank 38 is applied. .
[0029]
Next, the structure of the latch fixing part B will be described. The fixed point 40 on the rear side of the fuel tank 38 is also formed in a tongue shape along the center plane of the vehicle body, and a “U” -shaped bay portion 68 is formed extending in the longitudinal direction of the vehicle body and opening forward. On the other hand, as shown in FIG. 10, a rear tank bracket 69 is fixed to an intermediate portion in the vehicle width direction of the cross member 7 of the vehicle body frame 2. The rear tank bracket 69 is formed by bending a sheet metal material, for example, and includes a pair of left and right bowl-shaped tank stoppers 70 and a horizontal plate-shaped cushion plate 71, and the tank stopper 70 portion is fixed to the cross member 7. In addition, the tank holding portion 51 is configured by the tank stopper 70 and the intermediate portion of the cross member 7. Cushion mounting holes 72 are formed in the left and right cushion plates 71, respectively.
[0030]
As shown in FIGS. 4 and 10, a cushion unit 74 is attached to the rear tank bracket 69. The cushion unit 74 is composed of a pair of left and right flat cushion members 75 mounted on the left and right cushion plates 71 of the rear tank bracket 69, and a grommet-like cushion member 76 positioned at the lower rear side therebetween. It is integrally formed of an elastic material such as. Positioning projections 77 formed on the lower surfaces of the left and right cushion members 75 are inserted from above into the cushion mounting holes 72 of the cushion plate 71, while the cushion member 76 is fitted between the left and right tank stoppers 70, and the slit 78 The part is opened and put on the middle part of the cross member 7.
[0031]
Then, the bay entry portion 68 of the fixing point 40 is hooked from behind to the cross member 7 (cushion member 76) between the left and right tank stoppers 70 of the rear tank bracket 69 (see also FIG. 11). The fixed point 40 is sandwiched between the left and right tank stoppers 70 and is restricted from moving in the vehicle width direction. However, since the baying portion 68 is formed in a “U” shape extending in the vehicle body longitudinal direction, the fixed point 40 is It can be slid in the front-rear direction with respect to the tank holding part 51, that is, in a direction in which it is in contact with or separated from the fastening fixing part A in plan view. The fixing point 40 is supported on the tank holding portion 51 in an anti-vibration manner by the elasticity of the cushion member 76 interposed between the fixing point 40 and the tank holding portion 51 (7, 70).
[0032]
As described above, in the latching fixing part B, the fixing point 40 of the fuel tank 38 is configured to be slidable with respect to the tank holding part 51. However, the sliding direction of the fuel tank 38 is swollen by contact with fuel. Along the dimension change direction X (see FIG. 2) when the dimension changes.
[0033]
By the way, the vibration-proof holding part 80 is constituted by the cushion plate 71 of the rear tank bracket 69 and the cushion member 75 of the cushion unit 74 placed thereon, and the fuel tank 38 is placed thereon. Since the vibration-proof holding portion 80 is positioned in the vicinity (immediately before) the latch fixing portion B, the bottom surface of the fuel tank 38 in the vicinity of the fixing point 40 is supported in a vibration-proof manner by the elasticity of the cushion member 75.
[0034]
On the other hand, a cushion member 81 is mounted on the upper surface of the tank holding plate 16 provided inside the left and right lower pipes 4 of the vehicle body frame 2 to constitute a vibration-proof holding portion 82. The position of the vibration-proof holding portion 82 (cushion member 81) is set so as to be positioned on both the left and right sides with a line connecting the fastening fixing portion A and the latching fixing portion B in plan view (see FIG. 3). . Then, the left and right bottom surfaces of the fuel tank 38 are placed on the anti-vibration holding portion 82 and supported in an anti-vibration manner by the elasticity of the cushion member 81.
[0035]
The fuel tank 38 is attached to the vehicle body frame 2 by the attachment structure as described above. The procedure for attaching the fuel tank 38 to the vehicle body frame 2 is as follows. First, the fixing point 40 is hooked to the tank holding part 51 in the hooking fixing part B, and then the fixing point 39 is fixed to the tank fastening part 49 in the fastening fixing part A. Fasten with screw 50. Also, the procedure is reversed when removing.
[0036]
In this fuel tank mounting structure, the fuel tank 38 is fastened to the vehicle body frame 2 with the screw 50 only in the fastening and fixing portion A. For this reason, the required number of fixed parts such as the screw 50, spacer pipe 64, and washer 65 can be reduced to one set, and the fuel tank 38 can be easily attached to the vehicle body frame 2 with a very small number of parts and a simple structure. Can be attached to.
[0037]
In addition, the slide structure in the latching fixing part B has a great influence on the relative positional accuracy between the tank fastening part 49 (nut boss 54) and the tank holding part 51 (cross member 7, tank stopper 70) of the vehicle body frame 2. Without fixing, the fixing points 39 and 40 of the fuel tank 38 can be attached to the tank fastening portion 49 and the tank holding portion 51 without difficulty. Therefore, the relative positional accuracy of the tank fastening part 49 and the tank holding part 51 can be relaxed to facilitate the production of the vehicle body frame 2, and the production cost of the motorcycle 1 can be greatly reduced in these respects. .
[0038]
In this fuel tank mounting structure, the vehicle body frame 2 and the fuel tank 38 are connected via the front tank bracket 55 at the fastening and fixing portion A, but a large load that exceeds the normal holding load of the fuel tank 38 is applied. Since the front tank bracket 55 is sometimes deformed, for example, when the body frame 2 is deformed due to a collision of the motorcycle 1 or the like, the external force accompanying the deformation of the body frame 2 is caused by the deformation of the front tank bracket 55. It is absorbed and does not reach the fuel tank 38. Therefore, deformation of the fuel tank 38 can be avoided.
[0039]
Further, since the sliding direction of the fixing point 40 in the latch fixing portion B is along the dimensional change direction X when the fuel tank 38 is swollen, the dimensional change when the fuel tank 38 is swollen is absorbed by the slide of the fixing point 40. Unreasonable stress is not applied to the fuel tank 38.
[0040]
Further, in this fuel tank mounting structure, since the anti-vibration holding portions 82 are provided on both the left and right sides of the line connecting the fastening fixing portion A and the latching fixing portion B in plan view, the bottom surface of the fuel tank 38 is supported. The fuel tank 38 is supported at four points, front, rear, left, and right, by the fixing portion A, the latch fixing portion B, and the left and right vibration-proof holding portions 82, and is stably fixed. Since the left and right anti-vibration holding parts 82 support most of the weight of the fuel tank 38, a large load is not applied to the fastening and fixing parts A and B, and the fixing parts A and B are installed before and after. The fuel tank 38 can be stably fixed with only a minimum of two fixing portions.
[0041]
In addition, a cushion member 63 is interposed between the fixing point 39 of the fuel tank 38 and the tank fastening part 49 (front tank bracket 55) in the fastening fixing part A, and the fixing point of the fuel tank 38 in the latching fixing part B. A cushion member 76 is also interposed between 40 and the tank holding portion 51 (cross member 7, tank stopper 70), and an anti-vibration holding portion 80 (cushion member 75) is also provided in the vicinity of the latch fixing portion B. As a result, the entire fuel tank 38 can be fixed in an anti-vibration manner to prevent resonance with vehicle body vibrations, thereby preventing abnormal noises and the like. Moreover, since the two cushion members 75 and 76 are integrated into the cushion unit 74, the number of parts and the number of assembling steps can be reduced, and the manufacturing cost can be further reduced.
[0042]
In the present embodiment, the tank fastening portion 49 in the fastening and fixing portion A and the tank holding portion 51 in the latching and fixing portion B are both provided on the vehicle body frame 2, but not limited to the vehicle body frame 2 and other vehicle body components. Alternatively, the fuel tank 38 may be attached by providing a structure such as the tank fastening part 49 or the tank holding part 51.
[0043]
This fuel tank mounting structure is not limited to the fuel tank of a motorcycle, but can be applied to fuel tanks of other vehicles and other tanks (oil tank, water tank, etc.).
[0044]
【The invention's effect】
As described above, the fuel tank mounting structure for a motorcycle according to the present invention includes a fastening fixing portion in which one fixing point of the fuel tank is fastened with a screw to the tank fastening portion of the vehicle body frame, and the other fuel tank mounting portion. Latch fixing that a fixing point is latched to the tank holding portion of the vehicle body frame and that the fixing point is slidably held with respect to the tank holding portion only in a direction contacting and separating from the fastening fixing portion in a plan view. And the fastening fixing portion is disposed on the front side of the fuel tank, the latching fixing portion is disposed on the rear side of the fuel tank, and the latching fixing portion on the rear side of the fuel tank is provided with the tank holding portion. The cross member along the vehicle width direction is provided with a pair of left and right tank stoppers, while the fixed point extends in the longitudinal direction of the vehicle body and has a bay opening that opens at one end. And, the indentation is characterized by being configured is hooked from the front and rear direction to the cross member between the left and right tank stopper of the tank holder, according to this structure, the fuel by a small number of parts and simple structure The tank can be easily attached to the vehicle body side, and the working accuracy of the vehicle body frame related to the attachment of the fuel tank can be relaxed to reduce the manufacturing cost of the motorcycle. Moreover, the structure of the latching fixing part can be simplified and the sliding action can be ensured.
[0045]
In the embodiment of the present invention , a connecting member is interposed between the fixing point and the tank fastening portion in the fastening and fixing portion, and a load exceeding the holding load of the fuel tank acts on the strength of the connecting member. Since the connecting member is set to be deformed at the time, the external force accompanying the deformation of the vehicle body frame can be absorbed by the deformation of the connecting member to prevent the fuel tank from being deformed.
[0046]
Furthermore, in the embodiment of the present invention, since the sliding direction of the fixing point in the latch fixing portion is aligned with the dimensional change direction at the time of swelling of the fuel tank, the size when the fuel tank made of synthetic resin swells. The change can be absorbed by the slide at the fixed point, and an excessive stress can be prevented from acting on the fuel tank.
[0048]
Further, in the embodiment of the present invention, the anti-vibration holding portion that supports the fuel tank in an anti-vibration manner by the elasticity of the cushion member is provided on both the left and right sides of the line connecting the fastening fixing portion and the latch fixing portion in plan view. Since the vehicle body frame is provided so as to be positioned, the fuel tank can be stably fixed with the minimum fixing portion.
[0049]
Further, in the motorcycle fuel tank mounting structure according to the present invention, a vibration-proof holding portion cushion member for supporting the fuel tank on the vehicle body frame in a vibration-proof manner is provided in the vicinity of the latch fixing portion. Since the cushion member and the cushion member interposed between the fixing point in the latch fixing portion and the pair of left and right stoppers in the tank holding portion are integrated , the fuel tank is supported in a vibration-proof manner and the vehicle body vibration Resonance can be prevented and the occurrence of abnormal noise can be prevented. In addition, it is possible to reduce the manufacturing cost of the motorcycle by reducing the number of parts and the number of assembly steps.
[0050]
The fuel tank mounting structure for a motorcycle according to the present invention includes a cushion member interposed between the fixing point and the tank fastening portion in the fastening fixing portion, and the fixing point in the latch fixing portion. Since the cushion member is interposed between the tank holding portion and the fastening fixing portion and the latch fixing portion, the fuel tank is supported in an anti-vibration manner, and the entire fuel tank is fixed in an anti-vibration manner to Resonance can be prevented and generation of abnormal noise can be prevented.
[Brief description of the drawings]
FIG. 1 is an overall left side perspective view of a scooter type motorcycle to which an embodiment of a fuel tank mounting structure according to the present invention is applied.
2 is an enlarged left side view of the vicinity of a fuel tank installation portion of the motorcycle shown in FIG. 1, and shows one embodiment of the present invention.
FIG. 3 is a plan view of the vicinity of a fuel tank installation part.
FIG. 4 is a perspective view of the vicinity of the fuel tank installation portion as viewed from the upper left.
FIG. 5 is a left side view of a single fuel tank.
FIG. 6 is a plan view of a single fuel tank.
FIG. 7 is a perspective view of a front tank bracket.
FIG. 8 is a plan view of a front tank bracket.
9 is a view showing the structure of a fastening portion by a cross section taken along line IX-IX in FIG. 2;
FIG. 10 is an exploded perspective view showing a structure of a latch fixing portion.
FIG. 11 is a longitudinal sectional view showing a structure of a latch fixing portion.
[Explanation of symbols]
1 Motorcycle 2 Body frame 7 Cross member
38 Fuel tank
39, 40 fixed points
49 Tank fastening part
50 screw
51 Tank holder
55 Front tank bracket equivalent to connecting member
68 Bay Entrance
69 Rear tank bracket
70 Tank stopper
63, 75, 76, 81 Cushion member
74 Cushion unit
80, 82 Anti-vibration holding part A Fastening fixing part B Hanging fixing part X Direction of dimensional change when fuel tank swells

Claims (3)

One fixing point of the fuel tank is fastened with a screw to the tank fastening portion of the vehicle body frame, and the other fixing point of the fuel tank is hooked to the tank holding portion of the vehicle body frame, and this fixing point Has a latch fixing portion that is slidably held only in a direction in which the tank holding portion comes into contact with and separates from the fastening fixing portion in plan view, and the fastening fixing portion is disposed on the front side of the fuel tank. The fixing portion is disposed on the rear side of the fuel tank, and the latch fixing portion on the rear side of the fuel tank is configured by providing the tank holding portion with a pair of left and right tank stoppers on a cross member extending in the vehicle width direction. The fixing point has a shape having a bay portion that extends in the longitudinal direction of the vehicle body and is open at one end, and the bay portion is clamped between the left and right tank stoppers of the tank holding portion. Fuel tank mounting structure for a motorcycle, characterized by being configured is hooked from the front and rear direction to the scan members. A cushion member of an anti-vibration holding portion for supporting the fuel tank on the body frame in an anti-vibration manner is provided in the vicinity of the latch fixing portion, and the cushion member of the anti-vibration holding portion, a fixing point in the latch fixing portion, and a tank 2. The fuel tank mounting structure for a motorcycle according to claim 1, wherein a cushion member interposed between a pair of left and right stoppers of the holding portion is integrated .   A cushion member is interposed between the fixing point and the tank fastening portion in the fastening fixing portion, and a cushion member is interposed between the fixing point and the tank holding portion in the latch fixing portion. Item 2. A fuel tank mounting structure for a motorcycle according to Item 1.

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