JPH10236365A - Fuel tank fitting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form necessary work space without large oscillation of a fuel tank by moving the fuel tank in the longitudinal direction when a link member is erected so that an engagement member is disengaged from a support member to oscillate upward. SOLUTION: A fuel tank 30 is so constructed that the rear end is pivoted on a sub-stay 50 through a rubber member 55 by a bolt 56 and adapted to move by the oscillation. When the sub-stay 50 is erected, it is moved to a designated high position so that the fuel tank 30 is also moved upward. In maintenance, when a bolt 48 is detached to lift up the fuel tank 30 and move the same backward, an engagement member 34 is pulled out of a rubber buffer member 41. The sub-stay 50 keeps the erect state, and the rear part of the fuel tank 30 is raised to a designated height to be supported. In such a condition, the front of the fuel tank is lifted up, and in that position, it is supported through a spanner. Accordingly, the space among an internal combustion engine, a carbureter 23 and the fuel tank 30 can be enlarged as a whole.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel tank mounting structure for a straddle-type vehicle on which a driver such as a motorcycle, a three-wheeled vehicle, or a four-wheeled vehicle rides.

[0002]

2. Description of the Related Art In such saddle-ride type vehicles, there are many examples in which a fuel tank is supported by a main frame extending rearward from a head pipe. The fuel tank is removable for the maintenance of the components arranged in the hopper. Alternatively, there is an example in which the fuel tank swings upward for maintenance.

FIG. 10 shows an example of a motorcycle disclosed in Japanese Utility Model Publication No. 5-12149. Head pipe 01
A pair of left and right main frames 02 extend rearward from the rear, and a down frame 03 which is bent downward is provided at the rear end of the main frame 02, and a seat rail 04 extends obliquely upward from the middle of the main frame 02 to the rear. ing.

A front wheel 06 is pivotally supported at the lower end of a front fork 05 pivotally supported by a head pipe 01, and a rear wheel 08 is pivotally supported at the rear end of a swing arm 07 whose front end is pivotally mounted to a down frame 03. I have. A parallel four-cylinder internal combustion engine 01 that is substantially upright on an engine hanger 09 suspended from the front of the main frame 02
The carburetor 011 is connected to an intake pipe extending obliquely upward rearward from the cylinder of the internal combustion engine 010, and an air cleaner 012 is connected to the carburetor 011.

The carburetor 011 and the air cleaner 012 are located at substantially the same height in front of the seat 015 supported on the seat rail 04. A fuel tank 020 is provided above the carburetor 011, the air cleaner 012 and the cylinder of the internal combustion engine 010. Is provided. A rear end of the internal combustion engine 010 is mounted on a hinge 021 provided on the seat rail 04, and a mounting bracket 022 is provided on a front end. The mounting bracket 022 is screwed into a mounting portion 024 on a reinforcing pipe 023 by a bolt 025. Be worn.

Accordingly, if the seat 015 is removed, the bolt 025 is removed, and the fuel tank 020 is swung upward, the internal combustion engine 01
0 and the upper part of the vaporizer 012 are opened.
The other end of a support rod 026, one end of which is pivotally supported at the bottom of the cylinder 0, is engaged with a bracket 027 provided on a cylinder head cover to serve as a support. As shown by a two-dot chain line in FIG.
020 is swung upward, and maintenance such as checking of the spark plug and the carburetor 012 can be performed.

[0007]

Since the rear end of the fuel tank 020 is attached to a hinge 021 provided on the seat rail 04, the swing center of the fuel tank 020 is at a position fixed to the vehicle body. is there. Therefore, when the fuel tank 020 is swung upward about the hinge 021, the upper part of the front internal combustion engine 010 is greatly opened, but the rear carburetor 01 is opened.
In order to easily perform maintenance work on the upper side of 2 etc. narrowly to the rear side, as shown by the two-dot chain line in FIG.
020 must be rocked a lot.

Since the fuel delivery pipe and the like extend from the fuel tank 020, if the fuel tank 020 is largely swung as described above, handling of the fuel delivery pipe and the like becomes a problem, which hinders maintenance work and reduces work efficiency. Therefore, it is necessary to devise the piping of the fuel delivery pipe or to remove the fuel tank for maintenance.

In the fuel tank 020, the mounting bracket 022 at the front end is overlaid on the mounting portion 024 on the reinforcing pipe 023 from above and screwed with the bolt 025.
022, bolt 025, etc. are visible from the outside, hindering their commercial value.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a fuel tank which is capable of forming a required working space without greatly swinging the fuel tank and which is excellent in workability. The point is to provide a mounting structure. Another object of the present invention is to provide a fuel tank mounting structure capable of improving the commercial value without exposing the fuel tank mounting member.

[0011]

In order to achieve the above object, the present invention provides a fuel tank mounting structure for a saddle type vehicle in which a fuel tank is supported on a main frame extending rearward from a head pipe. , The other end of a link member pivotally attached at one end to the main frame and attached to the fuel tank so as to be able to stand up and down, is pivotally attached to a rear end of the fuel tank, and is an engagement member fixed to a front portion of the fuel tank. Has a fuel tank mounting structure in which the fuel tank is engaged with and supported by a support member provided on the main frame by the forward and backward movement of the fuel tank based on the standing / falling of the link member.

The fuel tank is supported on the main frame via a link member whose rear end is folded down, and the front portion is supported and attached to the main frame by engaging an engaging member with a supporting member. When the link member is raised, the fuel tank moves in the front-rear direction and the engaging member is disengaged from the support member, so that the fuel tank can swing upward.

Since the swing center at this time is located at the upper end of the upright link member, the front side of the fuel tank is swung upward, and the rear side of the fuel tank is supported by the link member and is at a high position above. Therefore, it is possible to easily secure a sufficient work space for performing maintenance on the equipment not only below the front part of the fuel tank but also below the rear part of the fuel tank without largely swinging the fuel tank upward.

Since the fuel tank does not need to be largely swung upward, the fuel delivery pipe or the like extending from the fuel tank can be left as it is, so that the maintenance work is not hindered and the working efficiency can be improved. In addition, since the engaging member is disengaged from the supporting member by moving in the front-rear direction, it can be provided at a location that cannot be seen from the outside, so that it is possible to improve the commercial value.

According to a second aspect of the present invention, in the fuel tank mounting structure according to the first aspect, the main frame extends backward by one from a head pipe, and the fuel tank has a main wall at a center of a bottom wall. The fuel tank has a concave portion oriented in the front-rear direction so as to fit into the frame from above, the fuel tank covers the main frame so as to straddle the left and right sides, and the engaging member is the support member inside the concave portion of the fuel tank. And is supported by being engaged.

Since the engaging member engages with the supporting member inside the concave portion of the fuel tank, the engaging member and the supporting member are not easily visible from the outside. it can.

According to a third aspect of the present invention, in the fuel tank mounting structure according to the second aspect, the support member protrudes at a predetermined position on a side surface of the main frame, and the engagement member is connected to a bottom wall of the fuel tank. The front portion of the fuel tank is provided at a predetermined position corresponding to the support member on the inner side surface of the concave portion, and the interposition member mounted on the upper surface of the main frame is locked to the engagement member. Is to be maintained.

The link member is erected, the engaging member is removed from the supporting member, the fuel tank is swung upward, the intervening member is mounted on the upper surface of the main frame at an appropriate height, and the engaging member is mounted. As a result, the front part of the fuel tank is supported at the raised position by the interposition member, and the rear part is supported at the raised position by the upright link member, and the whole is maintained at the predetermined raised position higher than the mounting position. , Maintenance work can be easily performed.

According to a fourth aspect of the present invention, in the fuel tank mounting structure according to the first aspect, the link member is screwed to the main frame in a state where the engaging member is engaged with the support member. The fuel tank is fixed to the main frame.

By screwing the link member to the main frame, the movement of the fuel tank and the engagement member in the front-rear direction is regulated, so that the engagement between the engagement member and the support member is fixed, and the fuel tank is securely mounted. Attached to the main frame.

According to a fifth aspect of the present invention, in the fuel tank mounting structure of the first aspect, a rear portion of the fuel tank is provided.
The support member and the engaging member are pivotally attached to the link member via an elastic member, and are engaged via the elastic member.

Since the front and rear of the fuel tank are attached to the main frame via the elastic member, the vibration of the vehicle body is absorbed by the elastic member, and transmission to the fuel tank can be avoided as much as possible.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows an overall side view of a motorcycle 1 according to the present embodiment, and FIG. 2 shows a plan view thereof. A body frame of the motorcycle 1 has a main frame 3 extending rearward from a head pipe 2, and a pair of left and right down pipes from right and left side walls of a gusset 4 for reinforcing between the head pipe 2 and the main frame 3. 5 extends downward.

The main frame 3 has a rear portion bent downward and a pair of left and right pivot plates 7 via a cross member.
The lower end of the down pipe 5 is bent rearward to be connected to the sub-pipe 8, and the sub-pipe 8 extends obliquely upward and rearward, and the lower end of the pivot plate 7 is fixed to the main pipe via the pivot plate 7. It is connected to the frame 3.

A pair of left and right seat rails 9 whose front ends are fixed to the left and right side walls of the bent portion of the main frame 3 are bent slightly downward and then extend obliquely upward and rearward. It is joined on the way and supported from below.

A front wheel 12 is supported at the lower end of a front fork 11 rotatably supported by the front head pipe 2 of the vehicle body frame as described above, and a handle 13 is mounted on an upper top bridge 12 integral with the front fork 11. Installed.

The front end of the swing arm 15 is pivotally supported by a pivot bolt 16 on a pivot plate 7 connected to the bent rear end of the main frame 3, and a rear wheel 17 is provided on the rear end of the swing arm 15 that can swing up and down. A rear cushion 18 is interposed between the shaft and the upper body frame.

Below the gusset 4 at the front of the main frame 3, an in-line four-cylinder internal combustion engine 20 is provided suspended from the down pipe 5. The internal combustion engine 20 is a DOHC type internal combustion engine in which a cylinder 20a is substantially upright, and a spark plug 21 is inserted into the center of each cylinder head.

A carburetor 23 is connected to an intake pipe 22 extending rearward from each of the upright cylinders 20a. A connecting pipe 24 extends rearward and downward from the carburetor 23 and is disposed below the seat rail 9. It is connected to the installed air cleaner 25. Therefore, the air cleaner 25 is located between the seat rail 9 and the sub pipe 8 at a position lower than the carburetor 23 having substantially the same height as the cylinder head of the internal combustion engine 20.

An exhaust pipe extending forward from each cylinder 20a
26 is bent downward, wraps around the lower side of the internal combustion engine 20, and is divided into two left and right parts and connected to a muffler 27 on the left and right sides of the vehicle body.

A seat 28 is supported by the seat rail 9 and a fuel tank 30 is provided between the seat 28 and the head pipe 2 in front of the seat 28.
Are supported by the main frame 3 and disposed. As shown in FIGS. 3, 4, 7 and 9, the fuel tank 30 has a recess 31 formed so that the center of the bottom plate is cut out in the front-rear direction.
30l and 30r have a hanging shape.

A fuel supply port 32 is provided on an upper plate of the central tank portion 30c, and a fuel outlet 33 is provided on a bottom plate of the left tank portion 30l. The concave portion 31 of the bottom plate is formed in a channel shape by a central bottom plate 31c oriented forward and rearward and left and right inner plates 31l and 31r, and is engaged at a predetermined position in front of the left and right inner plates 31l and 31r.
34, 34 are fixed.

The engaging member 34 has a shape in which the front wall and the inner wall of the rectangular box are cut and opened.
Numerals 34 have their inner openings facing each other, and each has an opening at the front.

A rear stay 35 is fixed to the rear end of the central bottom plate 31c (corresponding to the rear end of the fuel tank 30). The rear stay 35 has left and right side plates 35l, 35r which are bent downward on both sides of a central plate abutted and fixed to the central bottom plate 31c of the fuel tank 30, and bolt holes 35a, 35a, 35b are provided at predetermined positions facing the left and right side plates 35l, 35r. 35a is drilled.

On the other hand, referring to FIG.
A gusset 4 in the shape of a square tube having a rectangular cross section and a channel shape is fitted from below. The cylindrical rubber cushioning members 41 having central shaft holes at both ends thereof are fitted.

The seat rails 9, 9 extend rearward from the left and right side surfaces of the rear bent portion of the main frame 3, respectively, and brackets 45 are provided at narrow portions between the front ends of the seat rails 9, 9 and the main frame 3. Is installed substantially horizontally. The rear end of the bracket 45 is bent upward to form a vertical wall 45a having a predetermined height, and a cylindrical bearing 45b oriented in the left-right direction is fixed along the vertical wall 45a.
A pair of left and right circular holes 45c, 45c are formed in front of 45b, and nuts 45d, 45d are welded to the back surface thereof.

The bracket 45 on the vehicle body frame side and the rear stay 35 at the rear end of the fuel tank 30 are connected to a substay 50 as a link member. The left and right side portions of the central plate portion 50c are bent in the same direction to form the left and right side plates 50l, 50l.
A cylindrical bearing portion 50a penetrates the opposite ends of the left and right side plates 50l, 50r in the left-right direction and is fitted into the opposite end portions of the left and right side plates 50l, 50r. 50b
Are drilled.

A pair of mounting holes 50d, 50d are formed at predetermined positions on the left and right sides of the central plate portion 50c. And left and right side plates
Steps 50 are provided at the edges along the circular holes 50b, 50b of 50l, 50r.
e, 50e are formed.

The ends of the left and right side plates 50l and 50r of the substay 50 are connected to the cylindrical bearing portion 45b of the bracket 45 on the vehicle body frame side.
The sub-stay 50 is pivotally attached to the bracket 45 by fitting the circular holes 50b, 50b into the holes of the cylindrical bearing portion 45b so that the pin 46 with a flange passes therethrough from one side. I do. A clip 47 is passed through the small hole 46a at the tip protruding from the circular hole 50b of the pin 46 to prevent the pin 46 from coming off.

When the sub-stay 50 is pivotally attached to the bracket 45 in this manner, the sub-stay 50 can be erected upward from the lying state in which the central plate portion 50c overlaps the substantially horizontal bracket 45 from above, and stands up vertically. At a position slightly inclined backward beyond the state, the steps 50e, 50e of the base end edges of the left and right side plates 50l, 50r of the substay 50 are locked to the vertical wall 45a of a predetermined height at the rear end edge of the bracket 45. The substay 50 can maintain the standing state.

When the sub-stay 50 overlaps the bracket 45 and is in the lying state, the pair of left and right circular holes 50
d and 50d coincide with a pair of circular holes 45c and 45c of the bracket 45, and bolts 48 and 48 are connected to the circular holes 50d and 50d and the circular holes 45c and 45c.
The sub-stay 50 can be fixed to the bracket 45 in a laid state by screwing and tightening the nuts 45d and 45d through the sub-stays 50c.

The substay 50 which stands up and falls down as described above
Flanged cylindrical rubber members 55, 55 are fitted into the left and right openings of the cylindrical bearing portion 50a at the swinging end thereof, and the flange portions contact the left and right end surfaces of the cylindrical bearing portions 50a of the two cylindrical rubber members 55, 55. The left and right side plates of the rear stay 35 at the rear end of the fuel tank 30
35l and 35r are sandwiched, the shaft is aligned and the flanged bolt 56 is inserted into the bolt hole 35a, cylindrical rubber member 55, bearing member
Threaded end of bolt 56 that penetrated through 50a and protruded to the other
A nut 57 with a flange is screwed into 56a.

Therefore, the fuel tank 30 has a rear end bolted.
The sub-stay 50 is pivotally connected to the sub-stay 50 via a cylindrical rubber member 55. The swing center (bolt 56) of the fuel tank 30 is moved by the swing of the sub-stay 50, and is predetermined when the sub-stay 50 is in the lying state. (See FIG. 6), and moves to a predetermined high position when the substay 50 stands up (see FIG. 8). Therefore, the rear part of the fuel tank 30 also moves up and down.

As described above, the rear end of the fuel tank 30 is attached to the vehicle body frame via the substay 50 so that the concave portion 31 of the bottom wall of the fuel tank 30 fits into the main frame 3 from above. The left and right tank portions 30l, 30r straddle the main frame 3 and the left and right inner plates 31l, 31r of the concave portion 31.
Engaging members 34, 34, which are fixed to face each other, engage a support shaft 40 provided on the front gusset 4 of the main frame 3 via a rubber cushioning member 41 to support the front portion of the fuel tank 30. Is done.

Since the engagement member 34 is open at the front, it must be engaged with the rubber cushioning member 41 from the rear. When the sub-stay 50 rises, the swing center (bolt 56) of the fuel tank 30 rises and moves backward, so that the fuel tank 30 retreats and the sub-stay
When 50 falls down, the swing center of the fuel tank 30 moves down and moves forward, so that the fuel tank 30 moves forward.

Therefore, when the sub-stay 50 falls down and the fuel tank 30 moves forward, the engaging member 34 becomes the rubber elastic member 41.
, And the fuel tank 30 is supported by the main frame 3 before and after. By fixing the sub-stay 50 that has fallen down to the bracket 45 with the bolts 48 (see FIG. 6), the fuel tank 30 cannot move back and forth, and the engaging member 34 does not come off the rubber cushioning member 41 and swings up and down. Movement is also regulated and firmly fixed.

FIGS. 6 and 7 show such a state, in which the engagement member 34 is provided with the inner plates 31 l and
Since the engaging member 34, the support shaft 40, the rubber cushioning member 41, and the like are not easily visible from the outside because they are provided in the recess 31 and are engaged with the inside of the concave portion 31, the aesthetic appearance is not hindered and the merchantability is improved. be able to.

The fuel tank 30 has a rubber cushioning member 41 at the front.
And the rear portion is supported via the cylindrical rubber member 55, so that the vibration of the vehicle body can be absorbed by the elastic member and transmission to the fuel tank 30 can be avoided as much as possible.

With the fuel tank 30 mounted on the vehicle body frame in this manner, the fuel tank 30 is mounted on the internal combustion engine 20 or the carburetor 23.
So that the maintenance of the ignition plug 21 and the carburetor 23 cannot be performed as it is.

Therefore, at the time of maintenance, when the bolt 48 is removed and the fuel tank 30 is lifted and moved rearward, the engaging member 34 is disengaged from the rubber buffer member 41, and the substay 50 swings rearward and upward, and the left and right of the substay 50 Side plate 50l, 50r
Steps 50e, 50e are locked to the vertical wall 45a of the bracket 45, and the sub-stay 50 is maintained in the upright state (see FIG. 8).
The rear part of the fuel tank 30 can be raised to a predetermined height and supported.

In this state, the front portion of the fuel tank 30 is lifted, and when the upper wall 34a of the engagement member 34 has passed over the upper surface of the main frame 3, a flat and long interposition member such as a spanner 60 is formed.
Is placed on the upper surface of the main frame 3, and the end of the spanner 60 protruding left and right from the main frame 3 is inserted into the engaging member 34 and locked on the upper wall 34a thereof, so that the fuel tank 30
Can be supported via the spanner 60 at a position where the front part of the head is raised.

FIGS. 8 and 9 show a state in which the front portion of the fuel tank 30 is supported with the spanner 60 interposed. The front part of the fuel tank 30 is at a high position by locking the engaging member 34 to the spanner 60 in this way, and the rear part
At a position higher than 50, the fuel tank 30 is entirely raised and supported at a higher position. Therefore, the internal combustion engine 20
And the space between the carburetor 23 and the fuel tank 30 is enlarged as a whole.

Since the rear portion of the fuel tank 30 is supported at a high position as described above, the front portion of the fuel tank 30 does not swing greatly upward, and the spark plug is mounted in the working space shown in FIGS. Maintenance such as checking and replacing 21 can be easily performed, and maintenance of the rear carburetor 23 can be performed, so that sufficient maintenance work can be performed.

Since the fuel tank 30 does not need to be largely swung upward, there is no need to remove the fuel delivery pipe extending from the fuel cock attached to the fuel delivery port 33 of the fuel tank 30. Maintenance work efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is an overall side view of a motorcycle according to an embodiment of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a side view of a fuel tank.

FIG. 4 is a bottom view of the same.

FIG. 5 is an exploded perspective view showing a fuel tank mounting structure.

FIG. 6 is a side view of a main part showing a mounting state of a fuel tank.

FIG. 7 is a front view of the main part.

FIG. 8 is a side view of a main part showing a state where the fuel tank has been moved above a fuel tank.

FIG. 9 is a front view of the same.

FIG. 10 is an overall side view showing an example of a conventional motorcycle.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Motorcycle, 2 ... Head pipe, 3 ... Main frame, 4 ... Gusset, 5 ... Down pipe, 7 ... Pivot plate, 8 ... Sub pipe, 9 ... Seat rail, 11 ... Front fork, 12 ... Front wheel, 13 ... Handle , 15 ... swing arm, 16 ... pivot bolt, 17 ... rear wheel, 18 ... rear cushion, 20 ... internal combustion engine, 21 ... spark plug, 22 ... intake pipe,
23 ... vaporizer, 24 ... connecting pipe, 25 ... air cleaner, 26 ... exhaust pipe, 27 ... muffler, 28 ... seat, 30 ... fuel tank, 31 ...
Recessed part, 32 ... filler port, 33 ... fuel outlet, 34 ... engaging member, 35
... Rear stay, 40 ... Support shaft, 41 ... Rubber cushioning member, 45 ... Bracket, 46 ... Pin, 47 ... Clip, 48 ... Bolt, 50 ... Substay, 55 ... Cylinder rubber member, 56 ... Bolt, 57 ... Nut, 60 ... spanner.

Claims (5)

[Claims] 1. A fuel tank mounting structure for a saddle-ride type vehicle in which a fuel tank is supported on a main frame extending rearward from a head pipe, wherein one end is pivotally mounted on the main frame so as to be erected and fallable. The other end of the link member is pivotally attached to the rear end of the fuel tank, and the engagement member fixed to the front portion of the fuel tank is moved by the forward / backward movement of the fuel tank based on the standing / falling of the link member. A fuel tank mounting structure, which is supported by engaging with a support member provided on a frame. 2. The main frame extends one back from a head pipe, and the fuel tank has a recess oriented in the front-rear direction so that a bottom wall center is fitted into the main frame from above. 2. The fuel tank according to claim 1, wherein the fuel tank is covered so as to straddle the main frame from side to side, and the engaging member is supported by being engaged with the supporting member inside a concave portion of the fuel tank. Fuel tank mounting structure. 3. The support member protrudes at a predetermined position on a side surface of the main frame, and the engagement member is provided at a predetermined position corresponding to the support member on an inner surface of a concave portion of a bottom wall of the fuel tank. The fuel tank mounting according to claim 2, wherein the interposition member mounted on the upper surface of the main frame is locked to the engagement member so that the front portion of the fuel tank is maintained at a predetermined raised position. Construction. 4. The fuel tank is fixed to the main frame by screwing the link member to the main frame in a state where the engaging member is engaged with the support member. Fuel tank mounting structure. 5. The fuel tank according to claim 1, wherein a rear portion of the fuel tank is pivotally connected to the link member via an elastic member, and the support member and the engaging member are engaged via an elastic member. Fuel tank mounting structure.