JP2530075B2 - Scooter type motorcycle - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scooter type motorcycle in which a tank for storing liquid such as fuel is arranged below a seat.

[0002]

2. Description of the Related Art In a scooter type motorcycle, a frame is bent downward between a front fork and a seat, and a footrest plate of a driver is installed at the bottom of the bent portion so that the rider can easily get on and off. are doing.

Therefore, in this type of motorcycle, the space between the front fork and the seat is occupied as a space for accommodating the driver's foot, and this portion cannot be used as a space for installing parts. Therefore, various functional parts such as the fuel tank are collectively arranged below the seat.

In this seat, the front end of the seat bottom plate is rotatably supported by the frame so as to be vertically rotatable. For fuel injection work, the seat is pivoted upward to open the upper surface of the fuel tank. The exposed injection port is exposed.

[0005]

However, the inlet of the conventional fuel tank is located directly under the seating portion of the occupant in the seat. For this reason, if the fuel tank is projected upward in order to increase the capacity of the fuel tank, there are problems that the seat becomes taller and the cushioning material of the seat is reduced in thickness, resulting in poor seating comfort.

Further, since the front end pivotal support portion of the seat and the inlet of the fuel tank are relatively close to each other, even when the inlet is exposed by rotating the seat upward, the seat is immediately in front of the inlet. The seat bottom plate is located, and the seat bottom plate may be an obstacle during the fuel injection operation.

In order to deal with this problem, for example, as disclosed in Japanese Utility Model Application Laid-Open No. 58-103969, the inlet of the fuel tank is arranged below the rear end of the seat so that the seat faces upward. A motorcycle is known in which the fuel inlet is moved away from the seat when rotated.

In this conventional motorcycle, the fuel tank is supported by a pair of channel-shaped side frames passing below the seat, and the upper end of a shock absorber for suspending the rear wheels on one of the side frames. The parts are connected.

However, according to this structure, since the bottom portion of the fuel tank is sandwiched between the side frames which are thickly formed so as to withstand the shock applied through the shock absorber,
These side frames hinder the formation of a wide bottom portion of the fuel tank. At the same time, since the upper end of the shock absorber is located below the fuel tank by being interposed between the side frames, a recess that avoids the upper end of the shock absorber must be formed at the bottom of the fuel tank. Therefore, there is a problem in that the bottom of the fuel tank cannot be formed wide and the increase in the tank capacity is hindered.

Further, since the thick side frame of the frame reaches the front end of the seat, the side surface of the cover that covers the side frame and the fuel tank largely projects in the vehicle width direction below the front end of the seat. . Therefore, when the occupant seated on the seat puts his / her foot to the side when the motorcycle is stopped, there is a risk that the foot and the cover may interfere with each other, resulting in poor foot contact. .

The present invention has been made under these circumstances, and it is possible to achieve a large capacity and a low center of gravity of a tank without raising the seat height or deteriorating the sitting comfort. A scooter-type automatic machine that can easily inject liquids such as fuel and can reduce the width of the vehicle body around the front part of the seat to improve foot contact and to place the shock absorber easily. The purpose is to provide motorcycles.

[0012]

To achieve the above object, the present invention provides a footrest plate disposed below a seat on which an occupant is seated and a front fork; and a rear portion of the footrest plate. A frame extending upward and having an upper end located below the seat; and connecting the upper end of the shock absorber for rear wheel suspension to the rear of the frame, A seat bottom plate supported by the frame, and a cushioning material laminated on the seat bottom plate, the seat having a protruding portion protruding upward at a rear end out of a seating portion of an occupant. ,
At the front end of the seat bottom plate located on the side opposite to the projecting portion, there is a hinge part that is rotatably connected to the frame in the vertical direction, below the seat, and above the frame. Arranges a tank for storing liquid, and covers the tank and the periphery of the frame with a cover having a rear end portion which is continuous with the lower end of the seat and projects rearward of the seat. It is premised on a scooter type motorcycle in which the upper surface of the rear end portion of the cover is inclined rearward and downward.

The seat bottom plate of the seat has a load receiving portion that abuts on the frame side between the hinge portion and the projecting portion, and the load receiving portion is recessed upward from the rear end of the load receiving portion to project the above. The frame has a recessed portion located below the portion, and the frame has a rear end portion that extends in the front-rear direction at the center portion in the vehicle width direction and has a rear end portion located in front of the protruding portion of the seat. Composed of frame members,
The upper end of the shock absorber is located to the side of the rear end of the frame member, and the rear end of the frame member projects rearward of the frame member to reach the inside of the rear end of the cover. A tank support member is connected, and the tank support member supports the tank in a state of surrounding the periphery of the tank, and the bottom portion of the tank is behind the frame member from the rear end portion of the frame member. And the rear portion of the tank is inclined rearward and downward along the upper surface of the rear end portion of the cover, and the tank is located at a position substantially corresponding to the lower portion of the protruding portion of the seat. , Has an injection port extending toward the upper sheet, and the injection port is projected into the inner space inside the recess.

[0014]

According to this structure, the frame extending from the rear part of the footrest plate to the lower part of the seat is composed of a single frame member passing through the central portion in the vehicle width direction. Can be suppressed to a narrow width, and good foot contact can be obtained. Since the frame member does not have to overhang in the vehicle width direction, it is possible to prevent the frame member from interfering with the upper end portion of the shock absorber, and to allow free movement in determining the stroke length of the shock absorber. With the increase, the shock absorber can be arranged without being constrained by the frame shape.

Further, since the projecting portion of the seat is out of the seating portion of the occupant, even if the thickness of the cushion material is reduced at the projecting portion due to the existence of the concave portion into which the inlet of the tank enters, the seating portion is seated. The cushioning performance of the part is not lost. For this reason, the upper surface of the tank including the inlet can be bulged upward without raising the seat or deteriorating the sitting comfort, and the tank capacity can be increased reasonably.

Further, the rear end of the frame member supporting the shock absorber is located in front of the projecting portion of the seat, and the tank is supported by the tank supporting member projecting rearward from the rear end of the frame member. Therefore, the bottom portion of the tank can be largely projected below the frame member without being disturbed by the frame member. Therefore, the capacity of the tank can be increased, the center of gravity of the heavy and large tank can be lowered, and the center of gravity of the motorcycle can be lowered.

Further, since the shock absorber is connected to the rear end portion of the frame member, no shock is directly applied to the tank support member connected to the frame member through the shock absorber, and the tank support member is connected to the tank support member from the shock absorber. It is not necessary to add rigidity to withstand the impact of. Therefore, the reinforcing structure of the tank supporting member can be simplified, and it is not necessary to provide the tank supported by the tank supporting member with a recess or the like for escaping the reinforcing structure, which also contributes to an increase in the tank capacity.

Further, according to the above structure, since the inner space of the recess is formed by recessing the seat bottom plate upward, the wall of the recess functions as a rib for reinforcing the seat bottom plate. In this case, since the recessed portion is recessed from the rear end of the load receiving portion of the seat bottom plate, the recessed portion is continuous with the contact portion between the seat bottom plate and the frame side. Therefore, the rigidity of the latter half portion of the seat bottom plate extending rearward from the load receiving portion is increased, and the latter half portion of the seat bottom plate is less likely to be deformed.

Therefore, the supporting structure of the sheet can be simplified, and even though the inlet of the tank is in the inner space of the recess, the interference between the recess and the inlet can be prevented, and the recess and the inlet can be prevented. The clearance between and can be minimized. Therefore, the height of the tank including the inlet can be increased, and the tank capacity can be increased accordingly.

Further, since the position of the inlet is largely displaced rearward from the connecting portion of the sheet to the frame, when the sheet is rotated upward, the sheet moves away from the inlet,
The area around the inlet is wider than before. Moreover,
As described above, since the injection port is projected so as to enter the inner space of the sheet, the position of the injection port becomes high when the sheet is rotated upward to expose the injection port. Therefore, the parts around the seat and the tank do not get in the way when the liquid is injected, and the liquid can be easily injected by that amount.

In addition, according to the above configuration, since the tank is projected rearward from the seat and the shock absorber, the space inside the cover can be effectively utilized as the installation space of the tank, and the tank capacity can be increased. You can secure enough. In this case, since the upper surface of the rear part of the tank is inclined rearward and downward, the shape of the tank itself is enlarged as it goes downward. Therefore, the center of gravity of the tank can be lowered while ensuring the tank capacity.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings applied to a scooter type motorcycle. In FIG. 3, the frame indicated by reference numeral 1 has a head pipe 2 at its front end. A single frame member 3 extending downward is welded to the head pipe 2. The frame member 3 is formed by bending a large-diameter pipe material, and is arranged at the center in the vehicle width direction. The lower end of the frame member 3 is extended substantially horizontally toward the rear,
The rear end of the extension 4 is raised obliquely rearward and upward. Then, the rising portion 5 of the frame member 3
A support portion 6 extending rearward is continuously provided on the upper part of the.

Therefore, the head pipe 2 and the frame member 3 constitute an underbone type pipe frame. A front fork 7 is pivotally supported on the head pipe 2 of the frame 1 as described above. A front wheel 8 is supported on the lower end of the front fork 7.
A plate-shaped footrest plate 9 is installed on the extension portion 4 of the frame member 3. A leg shield 10 for wind protection is provided in front of the footrest plate 9.

The rising portion 5 of the frame member 3
Extends upward from the rear end of the footrest plate 9, as shown in FIG. A front portion of the engine unit 12 is pivotally supported on a lower end portion of the rising portion 5. The engine unit 12 includes a forced air cooling type engine 13 and a transmission case 14 extending rearward from one side of the engine 13. At the rear end of the transmission case 14, a rear wheel 15
Is supported. The rear wheel 15 is driven by a continuously variable transmission housed in the transmission case 14. The rear end portion of the transmission case 14 is suspended by a shock absorber 11 that is installed between the rear end portion of the frame member 3 and the support portion 6 of the frame member 3, and the upper end of the shock absorber 11 is lateral to the rear end of the support portion 6. Is located in.

By the way, as shown in FIG. 1 and FIG.
A pair of brackets 16 and 17 protruding laterally respectively are welded to the upper end of the rising portion 5 of the frame member 3 and the rear end of the supporting portion 6. These brackets 16,
A storage box 18 made of synthetic resin is placed on the upper surface of the tank 17 as a tank support member. The storage box 18 includes a bottom plate 19 that is bolted to the upper surfaces of the brackets 16 and 17, and a side wall 20 that is erected on the peripheral edge of the bottom plate 19, and has a rectangular box shape with the upper surface opened as a whole. I am doing it. A flange portion 21 protruding outward is formed on the periphery of the opening 18 a of the storage box 18.

The front half of the storage box 18 is located on the support 6 of the frame member 3. Further, the rear half of the storage box 18 projects rearward from the support 6 of the frame member 3 and the upper ends of the shock absorbers 11. In the rear half of the storage box 18, the bottom plate 19 supports the frame 3. 6 and buffer 11
Overhangs below the upper end of the.

A fuel tank 24 and an oil tank 25 are installed on the bottom plate 19 of the storage box 18 via a rubber damper 23. The fuel tank 24 and the oil tank 25 are surrounded by the side wall 20 of the storage box 18. The front half portion 24 a of the fuel tank 24 is located on the support portion 6 of the frame member 3, and the rear half portion 24 b is projected rearward of the support portion 6. The rear half portion 24b of the fuel tank 24 projects below the upper end portions of the support portion 6 of the frame member 3 and the shock absorber 11. A fuel injection port 26 that projects upward is provided on the upper surface of the rear half 24b of the fuel tank 24.

The upper surface of the oil tank 25 is also provided with an oil inlet 29 that projects upward. On the bottom plate 19 of the storage box 18, both tanks 24,
A stand 27 is provided in front of 25.
A battery 28 is installed on the upper surface of the stand 27, and various electrical components 29 such as a CDI unit and an ignition coil are housed inside the stand 27.

A support plate 30 that straddles the opening 18a of the storage box 18 in the left-right direction is bolted to the flange portion 21 of the storage box 18. A rubber damper 31 is attached to the lower surface of the support plate 30. The support plate 30 is connected to the fuel tank 24 and the oil tank 2 via the rubber damper 31.
5 is pressed against the bottom plate 19 of the storage box 18, and the fuel tank 24 and the oil tank 25 are positioned and fixed to the storage box 18.

A seat 32 on which a driver is seated is arranged above the storage box 18. The seat 32 includes a seat bottom plate 33 and a cushion material 34 laminated on the seat bottom plate 33. The seat 32 has a seating portion 32a on which an occupant is seated, and a rear end portion of the seat 32 that is off the seating portion 32a is formed with a projecting portion 35 that projects upward. The protruding portion 35 is the seat portion 3
To hold the buttocks of the occupant seated on 2a,
The seat 32 for a motorcycle has already become common. Then, the protruding portion 35 of the sheet 32
Are located above the rear half 24b of the fuel tank 24. Therefore, the rear end of the support portion 6 of the frame member 3 is located in front of the protruding portion 35 of the seat 32.

The seat 32 has a front end portion of the seat bottom plate 33 rotatably connected to a front end portion of the flange portion 21 via a hinge 36. Therefore, the seat 32 has its rear end pivotable upward with its front end as a pivot point.
It is supported by the storage box 18.

The seat bottom plate 33 of the seat 32 is the storage box 1
8 facing the opening 18a. The lower surface of the seat bottom plate 33 on the front end side is in contact with the upper surface of the battery 28 via the rubber damper 37 and presses the battery 28. A support damper 38 as a load receiving portion is attached to the lower surface of the central portion of the seat bottom plate 33.
This support damper 38, as shown in FIG.
It is arranged between the hinge 36 located at the front end of the sheet and the projecting portion 35, and when the seat 32 is laid down horizontally,
It is located immediately before the inlet 26 of the fuel tank 24. The support damper 38 is in contact with the upper surface of the support plate 30, and releases the load applied via the seat 32 to the frame 1 side via the storage box 18.

At the rear part of the seat bottom plate 33, there is formed a recess 40 which is recessed upward. As shown in FIG. 1, the recess 40 has a wall 40 a extending upward from the rear end of the mounting portion of the support damper 38, and the recess 40 is arranged continuously to the support damper 38. Then, the recess 40
Is provided at a position substantially corresponding to the protruding portion 35 of the seat 32, and the presence of the recess 40 causes the protruding portion 35 to be
An inner space 41 that opens downwardly of the seat 32 is formed in the lower part of the. The inner space 41 is located directly above the rear half 24b of the fuel tank 24, and the inlet 26 of the fuel tank 24 is inserted into the inner space 41.

The periphery of the storage box 18 including the fuel tank 24 and the oil tank 25 is covered with a cover 45 connected to the seat 32. The lower part of the cover 45 continuously covers around the engine 13 of the engine unit 12.
The front portion of the cover 45 also integrally covers the rising portion 5 of the frame member 3, and the lower edge of the front end thereof is continuous with the rear end of the footrest plate 9.

Further, as shown in FIGS. 1 and 3, the cover 45 has a rear end portion 45a protruding toward the rear of the seat 32. The rear end portion 45a covers the rear half portion 24b of the fuel tank 24, and the upper surface 45b of the rear end portion 45a is inclined downward as it goes to the rear of the seat 32. Then, the upper surface 24d of the rear half 24b of the fuel tank 24 facing the upper surface 45b.
Is inclined downward as it goes rearward along the upper surface 45a of the cover 45.

According to such a structure, the frame member 3 extending from the rear portion of the footrest plate 9 toward the lower side of the seat 32.
Since the rising portion 5 is formed of a single pipe material that passes through the center portion in the vehicle width direction, the width of the frame 1 can be formed narrower below the front portion of the seat 32.
Therefore, it is possible to prevent the cover 45 from significantly overhanging in the vehicle width direction, and the occupant seated on the seat 32 has improved foot contact. Further, since the portion of the frame member 3 from the rising portion 5 to the supporting portion 6 does not have to largely project laterally from the center in the vehicle width direction, the supporting portion 6 interferes with the upper end portion of the shock absorber 11. There is no such thing. Therefore, this buffer 11
The degree of freedom in determining the stroke length is increased, and the shock absorber 11 can be arranged without being restricted by the shape of the frame 1.

Further, in the above structure, the protruding portion 3 protruding upward to the rear end of the seat 32, which is out of the seating portion 32a.
5, the inner space 41 opened toward the fuel tank 24 is formed in the lower part of the projecting portion 35, and the injection port 26 on the upper surface of the fuel tank 24 is projected into the inner space 41. , The protrusion 35 corresponding to the inner space 41
Even if the thickness of the cushion material 34 is reduced, the cushioning performance of the seating portion 32a does not have to be reduced.

Therefore, the upper surface of the fuel tank 24 including the inlet 26 can be bulged upward without raising the seat 32 or deteriorating the sitting comfort, and the capacity of the fuel tank 24 is unreasonable. You can increase without.

In addition, the supporting portion 6 at the rear end of the frame member 3 for supporting the upper end portion of the shock absorber 11 is located in front of the projecting portion 35 of the seat 32 and is projected to the rear of this supporting portion 6. Since the fuel tank 24 is supported by the storage box 18, the bottom portions of the storage box 18 and the fuel tank 24 can be projected to a position lower than the support portion 6 without being disturbed by the support portion 6. it can. Therefore, the fuel tank 2
It is possible to increase the capacity of 4 and the cruising range of the motorcycle becomes long. At the same time, the center of gravity of the heavy and large fuel tank 24 can be lowered, which is convenient for achieving a low center of gravity of the motorcycle.

Since the upper end of the shock absorber 11 is connected to the support portion 6 of the frame member 3, the frame member 3 receives the shock from the shock absorber 11 caused by the swing of the engine unit 12. Therefore, the shock from the shock absorber 11 is not directly applied to the storage box 18 connected to the support portion 6. Therefore, it is not necessary to add rigidity to the storage box 18 to withstand the impact from the shock absorber 11, and the reinforcing structure of the storage box 18 can be simplified and the side wall 20 can be made thin. As a result, the fuel tank 24 housed inside the storage box 18 does not need to be provided with a recess or the like for escaping a reinforcing structure such as a rib, and the side wall 20 is thin, so that the fuel tank 24 is large. This also has the advantage of contributing to an increase in tank capacity.

Further, the inner space 41 of the seat 32 is
Is formed by denting the seat bottom plate 33 upward, so that the wall portion 40a of the recess 40 functions as a rib that reinforces the seat bottom plate 33. In this case, the recess 40 is provided on the seat bottom plate 33.
The recess 40 is recessed upward from the mounting portion of the support damper 38 that abuts against the seat bottom plate 33 and the support plate 30.
Will be continuous with the contacting part with. Therefore, the rigidity of the latter half portion of the seat bottom plate 33 extending rearward of the support damper 38 is increased, and the latter half portion of the seat bottom plate 33 including the recess 40 is less likely to be deformed.

From this, the supporting structure of the rear end portion of the seat 32 can be simplified. At the same time, since the deformation of the seat bottom plate 33 is suppressed as described above, even though the inlet 26 of the fuel tank 24 enters the inner space 41 of the recess 40, the inlet 26 and the recess 40 interfere with each other. Can be prevented, and the clearance between the recess 40 and the inlet 26 can be minimized. Therefore, the height of the fuel tank 24 including the inlet 26 can be increased, and the capacity of the fuel tank 24 can be increased accordingly.

Further, the injection port 24 has the protruding portion 3 of the sheet 32.
Since it is located below 5, the position of the injection port 24 is largely displaced rearward from the front end of the seat 32, which is a connecting portion to the frame 1. Therefore, when the seat 32 is rotated upward to expose the inlet 26, the periphery of the inlet 26 is widely opened. Furthermore, since the injection port 26 is projected upward so as to enter the inner space 41 of the seat 32, in the state where the injection port 26 is exposed by rotating the seat 32 upward as described above, This inlet 26
The position of becomes higher.

Therefore, the peripheral parts such as the seat 32 and the oil tank 25 do not interfere with the fuel injection, and the fuel injection operation can be easily performed. Further, according to the above configuration, the rear half portion 24b of the fuel tank 24 is projected rearward from the upper ends of the seat 32 and the shock absorber 11, and the rear half portion 24b is inserted inside the rear end portion 45a of the cover 45. Therefore, the cover 45
The space inside the fuel tank 24 can be effectively utilized as the installation space for the fuel tank 24, and also in this respect, a sufficient tank capacity can be secured.

Since the upper surface 24d of the rear half portion 24b of the fuel tank 24 is inclined rearward and downward, it has a shape that is enlarged as the fuel tank 24 moves downward. Therefore, the center of gravity of the heavy and large fuel tank 24 can be suppressed as low as possible while ensuring the tank capacity, which is advantageous in achieving a low center of gravity of the motorcycle.

[0046]

According to the present invention described in detail above, the width of the frame can be formed narrower in the lower part of the front part of the seat, and it is possible to prevent the cover connected to the seat from largely protruding in the vehicle width direction. . As a result, the occupant seated on the seat has improved foot contact and can easily get on and off.
Further, since the frame member from the footrest plate to the seat does not have to largely project laterally from the center in the vehicle width direction, the frame member does not interfere with the upper end portion of the shock absorber, and The shock absorber can be arranged without being restricted by the shape of the frame, while increasing the degree of freedom in determining the stroke length.

Further, according to the present invention, the upper surface of the tank including the liquid inlet can be bulged upward without heightening the seat or deteriorating the sitting comfort.
Moreover, the bottom of the tank can be extended below the frame member without being obstructed by the upper end of the shock absorber or the frame member supporting the upper end. Therefore, the tank capacity can be reasonably increased, the center of gravity of a heavy and large tank can be lowered, and the center of gravity of the motorcycle can be lowered.

In addition, since the shock applied through the shock absorber can be received by the frame member while the motorcycle is running, it is not necessary to add rigidity to the tank support member to withstand the shock from the shock absorber. The reinforcing structure of the tank support member can be simplified. Therefore, it is not necessary to provide a recess or the like for escaping the reinforcing structure in the tank, and the tank itself can be upsized accordingly, which contributes to an increase in the tank capacity. Moreover, the inner space into which the inlet of the tank enters Since it is configured by recessing the seat bottom plate upward, this recess functions as a rib for reinforcing the seat bottom plate. Since this recess is directly connected to the rear end of the load receiving portion of the seat, the rigidity of the latter half portion of the seat bottom plate extending rearward from the load receiving portion is increased, and the latter half portion of the seat bottom plate including the recess is increased. It becomes difficult to deform. From this, it is possible to simplify the support structure for the seat and prevent interference between the inlet and the recess despite the inlet of the tank entering the inner space. The clearance between the inlet and the inlet can be minimized. Therefore, the height of the tank including the inlet can be increased, and the tank capacity can be increased accordingly.

Further, since the position of the injection port is largely displaced rearward from the connecting portion of the sheet to the frame, when the sheet is rotated upward, this sheet moves away from the injection port,
The area around the inlet will be wide open. When the sheet is rotated upward as described above and the inlet is exposed, the inlet is opened at a high position, so that the peripheral parts of the sheet and the tank become an obstacle during the liquid injection. Therefore, the liquid injection work can be easily performed.

Further, according to the above structure, the space inside the cover can be effectively utilized as a tank installation space, and a sufficient tank capacity can be secured.
And, since the upper surface of the latter half of this tank is inclined rearward and downward, the shape of the tank itself will be enlarged as it goes downward, and while maintaining the tank capacity, the center of gravity of a heavy and large tank can be maintained. It has an advantage that it can be kept low, which is more convenient for lowering the center of gravity of the motorcycle.

[Brief description of drawings]

FIG. 1 is a sectional view showing a positional relationship between a fuel tank and a seat.

FIG. 2 is a plan view showing a state in which a fuel tank and an oil tank are installed in a storage box.

FIG. 3 is a side view of a scooter type motorcycle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Frame 3 ... Frame member 7 ... Front fork 9 ... Footrest plate 11 ... Shock absorber 18 ... Tank support member (storage box) 24 ... Tank (fuel tank) 26 ... Filling port 32 ... Seat 32a ... Seating portion 33 ... Seat Bottom plate 34 ... Cushion material 35 ... Projection part 36 ... Hinge (hinge part) 38 ... Load receiving part (supporting damper) 40 ... Recess 40a ... Wall part 41 ... Inner space 45 ... Cover 45a ... Rear end part.

Claims (1)

(57) [Claims] 1. A footrest plate disposed below a seat on which an occupant is seated and a front fork; a footrest plate extending upward from a rear portion of the footrest plate, and an upper end portion of the footrest plate of the seat. A frame positioned below; a rear part of the frame is connected to an upper end of a shock absorber for rear wheel suspension; and the seat is a seat bottom plate supported by the frame and the seat bottom plate. This seat has a protruding portion that protrudes upward at the rear end outside the seating portion of the occupant, and the seat bottom plate located on the opposite side of the protruding portion. At the front end, there is a hinge part rotatably connected to the frame in the vertical direction, and below this seat, and above the frame, a tank for storing liquid is arranged. Tank or above A scooter-type automatic frame in which the periphery of the frame is continuous with the lower end of the seat and is covered with a cover having a rear end portion protruding rearward of the seat, and the upper surface of the rear end portion of the cover is inclined rearward and downward. In the two-wheeled vehicle, the seat bottom plate of the seat has a load receiving portion that abuts on the frame side between the hinge portion and the protruding portion, and the load receiving portion is recessed upward from the rear end of the load receiving portion, thereby A frame member having a recess portion located below, and the frame extending in the front-rear direction at the center portion in the vehicle width direction and having a rear end portion located in front of the projecting portion of the seat. The upper end of the shock absorber is located beside the rear end of the frame member, and the rear end of the frame member projects rearward of the frame member to -A tank support member reaching the inside of the rear end portion is connected, and the tank support member supports the tank in a state of surrounding the periphery of the tank, and the bottom portion of the tank is at the rear of the frame member. At the bottom of the frame member, the rear portion of the tank is inclined rearward and downward along the upper surface of the rear end portion of the cover, and the tank is configured to project from the seat. A scooter type motorcycle having an injection port extending toward an upper seat at a position substantially corresponding to a lower part of the portion, and the injection port protruding into an inner space inside the recess.