JPH0790831B2 - 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 having a unit swing type engine.

[0002]

2. Description of the Related Art A substantially horizontal low floor portion is provided at the front of a pair of left and right frame pipes connected to a head pipe, a step board is provided at this low floor portion, and the rear end of the low floor portion is raised. In a scooter type motorcycle in which a seat is arranged at the upper end of the rising portion, a space for accommodating the driver's leg is provided between the seat and the head pipe, and therefore the engine and the fuel tank cannot be arranged here. .

Therefore, in a scooter type motorcycle,
The mainstream layout is to arrange a fuel tank between the right and left rising portions that pass under the seat and to arrange a unit swing type engine unit directly below the fuel tank.

This type of engine unit integrally includes a transmission case extending rearward on one side of the crankcase, and a rear wheel driven by a belt is attached to the rear end of the transmission case. There is. The front end of the engine unit is swingably connected to the rising portion of the frame pipe, and the rear end portion of the transmission case is installed between the upper end rear portion of one rising portion to form a shock absorber. Suspended by a vessel. Therefore, the shock applied to the rear wheels while the motorcycle is traveling is transmitted to the shock absorber by the engine unit swinging up and down, and is absorbed and relaxed by the shock absorber.

[0005]

Although the lower end of the shock absorber is connected to the rear end of the transmission case, the connecting position of the shock absorber is the distance from the front end pivotal support of the engine unit and the rear wheel. It is determined based on the conditions on the engine unit side, such as the positional relationship with. Therefore, the position of the upper end of the shock absorber connected to the rising portion is naturally determined, and therefore the position and shape of the upper end of the rising portion are restricted by the shock absorber.

That is, when the upper end of the shock absorber is located outside the rising portion in the vehicle width direction, the rear end of the upper end of the rising portion is driven inward in the vehicle width direction by the presence of the shock absorber, so that the rising portion is arranged. The space becomes narrow. Then, in the scooter type motorcycle in which the fuel tank is arranged between the rising portions, the installation space for the fuel tank becomes small, and it becomes impossible to sufficiently secure the capacity of the fuel tank.

The present invention has been made under these circumstances, and it is possible to secure a sufficient space for installing a container below the seat and to increase the capacity of the container. It is difficult for muddy water, etc. splashed by the wheels to splash outward from the lower edges of the left and right side walls of the cover, preventing the outer surface of the transmission case from being soiled and keeping the lower edge of the cover bent inward. First, it is an object of the present invention to provide a scooter type motorcycle that can prevent the bent portion from interfering with the transmission case and the shock absorber.

[0008]

In order to achieve the above object, the present invention comprises a pair of frame pipes which are connected to a head pipe and are spaced apart from each other in the left-right direction.
These frame pipes have a low floor portion that extends rearward and substantially horizontally through a position lower than the head pipe, and a rising portion that extends upward from the rear end of the low floor portion. A container projecting above the rising portion is arranged between the two, and a seat is arranged above the container, and the engine and the one side of the engine are arranged rearward from the lower part of the rising portion. An extending transmission case is integrated, and at the rear end portion of the transmission case, an engine unit having rear wheels driven by power transmission means housed in the transmission case is arranged, and a front end of the engine unit is arranged. The upper part is swingably connected to the rising part, and the rear part of the transmission case of the engine unit and the one rising part are connected. Bridged the shock absorber between the end, the periphery of the shock absorber and the container and the rising portion, assumes scooter type motorcycle covered with a cover connecting to the bottom of the sheet.

The shock absorber has its upper end displaced inward in the vehicle width direction from the upper end of one rising portion, and the cover moves downward from the upper end on the seat side. It has left and right side walls protruding in the direction of expanding outward in the width direction, the lower edges of these side walls are bent inward in the vehicle width direction, and the tip of this bent part is wider than the outer surface of the transmission case in the vehicle width direction. In addition to being positioned inward in the direction, the lower edge portions of the left and right side walls are inclined upward as they move backward.

[0010]

According to this structure, the upper end of the shock absorber is displaced inward in the vehicle width direction from the upper end of the one rising portion, so that the upper end of this rising portion is not restricted by the shock absorber and is measured in the vehicle width direction. It is possible to project to the outside, and the arrangement interval of the left and right rising portions can be widened accordingly. Therefore, a wide space for installing the container can be secured between the rising portions, and the capacity of the container can be increased.

Further, since the lower edge portion of the cover is bent toward the inner side in the vehicle width direction, muddy water splashed up by the rear wheel to the inside of the cover while the motorcycle is running, the left and right side walls of the cover. Even if the water flows downward along the inner surface of the cover and is scattered outward from the lower edge, the muddy water is caught by the bent portion of the cover. For this reason,
It is possible to suppress scattering of muddy water and the like to the outside of the cover.

At the same time, since the tip of the bent portion is located on the inner side in the vehicle width direction with respect to the outer surface of the transmission case, even if the muddy water that cannot be received by the bent portion scatters under the cover, this muddy water is transmitted. It is guided inward in the vehicle width direction with respect to the outer surface of the case. Therefore, muddy water dripping from the inside of the cover is less likely to adhere to the outside surface of the conductive case,
It is possible to prevent the outer surface from being soiled.

Further, according to the above structure, since the bent portion of the cover is located inside the outer side surface of the transmission case in the vehicle width direction, when the engine unit swings up and down, the upper surface of the transmission case becomes the bent portion. There is a possibility that the upper surface of the transmission case and the bent portion may interfere with each other at the rear end of the transmission case, which is approached, and particularly, the swinging stroke in the upward direction becomes large. However, the lower edges of the left and right side walls of the cover are
Since it is inclined rearward, the lower edges of the left and right side walls move away from the upper surface of the transmission case as it goes to the rear of the transmission case. Therefore, even though there is a bent portion for preventing muddy water from scattering at the lower edge of the cover, it is possible to prevent interference between this bent portion and the transmission case.

At the same time, since the shock absorber does not have to enter between the side wall and the rising portion of the cover, the shock absorber is moved away from the side wall, and interference between the bent portion at the lower edge of the side wall and the shock absorber is also prevented. be able to.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings.

In the figure, reference numeral 1 is an underbone type frame, and a head pipe 2 located at the front end of the frame is
The down tube 3 extending downward is welded.

To the lower end of the down tube 3, front ends of a pair of left and right main pipes 4, 4 are welded. These main pipes 4, 4 are provided with substantially horizontal low floor portions 4a, 4a which are separated from each other in the left-right direction and extend rearward, and rising portions 5, 5 which extend upward from the rear ends of the low floor portions 4a, 4a. There is. The upper ends of the rising portions 5 and 5 extend rearward in a substantially horizontal direction, and the extended portions form left and right seat rails 6 and 6.

As shown in FIG. 2, the rising portions 5 and 5 have a first portion 5a extending upward from the rear ends of the low floor portions 4a and 4a at an angle close to a right angle, and the first portion 5a. A second portion 5b connecting the upper end of the portion 5a and the front ends of the seat rails 6 and 6 is provided. The second portion 5b extends rearward and obliquely upward at a small inclination angle closer to horizontal than the first portion 5a. For this reason, the rising portions 5 and 5 are bent in a substantially V shape in a side view at the boundary between the first portion 5a and the second portion 5b.

A steering shaft 7 is pivotally supported on the head pipe 2. A steering wheel 8 is attached to the upper end of the steering shaft 7, and a front fork 10 having a front wheel 9 is connected to the lower end thereof. The rear surfaces of the head pipe 2 and the down tube 3 are covered with the leg shield 11. A front cover 1 that covers the head pipe 2 and the steering shaft 7 from the front is provided on the front surface of the leg shield 11.
3 is attached, and the front cover 13 integrally includes a front fender 12 that covers the front wheel 9.

Further, the low floor portions 4a of the main pipes 4 and 4,
A step board 14 as a footrest member is installed on the 4a. The front end of this step board 14 is
It is connected to the lower end of the leg shield 11.

On the other hand, a fuel tank 15 as a container is arranged between the second portions 5b of the rising portions 5 and 5. The lower portion 15a of the fuel tank 15 is inclined along the second portion 5b which is the front lowering, and the fuel tank 15 is higher than the upper ends of the rising portions 5 and 5 and the seat rails 6 and 6. Is projected to.

A seat 16 is arranged on the fuel tank 15. The seat 16 is pivotally supported at the front end of the upper surface of the fuel tank 15 via a hinge 17 so as to be openable and closable.

An engine bracket 18 (only one of which is shown) protruding rearward is welded to the first portion 5a of the rising portions 5 and 5. A rocking link 20 is pivotally supported on the engine bracket 18 via pivot bolts 19, respectively. The front end of the engine unit 22 is swingably connected between the swing links 20 via a pivot shaft 21. This engine unit 22
Is located below the rising portions 5 and 5 and below the fuel tank 15.

The engine unit 22 integrally includes a two-cycle engine 23 and a transmission case 24. That is, the engine 23 has a cylinder standing upright on the upper surface of the crankcase 25, and the cylinder and the cylinder head (both not shown) are covered by the air shroud 26. In the air shroud 26, the outside air sucked from a suction hole (not shown) on the right side surface of the ela shroud 26 is forcibly blown as cooling air. This cooling air cools the cylinder and the cylinder head, and then blows off the air outlet 2 on the left side surface of the air shroud 26.
Emitted from 7.

Therefore, the engine 23 of this embodiment is
Is a forced air cooling type, and its air shroud 26
Is located directly below the fuel tank 15.

The transmission case 24 extends rearward from the left end of the crankcase 25 and extends to the case body 24a.
And a case cover 29 that covers the left side surface of the case body 24a. The transmission case 24 also serves as a swing arm, and a rear wheel 28 is supported by a cantilever at the rear end of the case body 24a. Between the case body 24a and the case cover 29, power transmission means for driving the rear wheels 28, for example, a V-belt automatic transmission is accommodated. Then, as shown in FIG. 3, such a transmission case 24 enters the inside of the left seat rail 6 in the vehicle width direction.

The rear end of the engine unit 22 is suspended on the left seat rail 6 via a shock absorber 30. The shock absorber 30 includes a shock absorber 31 and
A coil spring 32 for urging the shock absorber 31 in the extension direction is provided. The lower end pivot portion 33 of the shock absorber 31 is rotatably connected to a support protrusion 34 provided on the upper surface of the rear end portion of the case body 24a via a bolt 35.

Therefore, the shock absorber 30 is located at a position inside the vehicle width direction inside the upper end of the left rising portion 5 and the seat rail 6 connected to it, that is, the seat rails 6, 6.
The upper end pivot portion 36 of the shock absorber 31 avoids the seat rail 6 on the left side and enters the inner side in the vehicle width direction from the seat rail 6, and the bracket is attached to the seat rail 6. They are connected via 37.

That is, as shown in FIG. 3, the bracket 37 is bent so as to open upward, and its upper end is welded to the lower surface of the seat rail 6. A sleeve 38 is attached to the bracket 37 so as to penetrate in the left-right direction. An upper end pivot portion 36 of the shock absorber 30 is opposed to an end portion of the sleeve 38 that is located inside the seat rail 6 in the vehicle width direction. The upper end pivot portion 36 is bolted from the inside in the vehicle width direction. 39 is inserted. The bolt 39 penetrates the sleeve 38 and is led out to the outside.
By screwing the nut 40 into the leading end of the shock absorber 9,
An upper end pivot portion 36 of the is pivotally connected to a bracket 37.

Therefore, the engine unit 22 is cantilevered on the frame 1 via the single shock absorber 30.

The lower periphery of the seat 16 is covered with a cover 41. The cover 41 includes a front cover portion 42 that surrounds the front and side of the engine 23 from the periphery of the front half of the fuel tank 15, and the fuel tank 15
Of the upper part of the rear side of the seat rails 6 and 6 from the periphery of the latter half of
And a pair of left and right side cover portions 44, 44 which continuously cover the bottom portions of the seat rails 6, 6 and the shock absorber 30 and the fuel tank 15 from the side, and these side cover portions 44, 44 of the cover 41. It constitutes the left and right side walls.

As shown in FIG. 3, the side cover portions 44, 44 have a cross-sectional shape that expands outward in the vehicle width direction as they go downward from the upper end portion on the seat 16 side. It is located above 29. And
The lower edge portions of the side cover portions 44, 44 are bent inward in the vehicle width direction.
The tip end of 44a is located inside the outer side surface of the transmission case 24 in the vehicle width direction.

Further, as shown in FIG. 1, the lower edge portions of the side cover portions 44, 44 are inclined upward as they move backward. Due to this inclination, the side cover portion 44,
The lower edge portion 44 of the transmission cover 24 moves toward the rear end portion where the upward swing stroke of the transmission casing 24 increases, so that the case cover 2 thereof is
It is moving away from the upper surface of 9.

According to this structure, the seat rail 6 is formed by connecting the upper end of the shock absorber 30 for suspending the engine unit 22 to the second portion 5b of the left rising portion 5.
Is disposed further inward in the vehicle width direction, and the upper end pivot portion 36 of the shock absorber 30 is displaced inward in the vehicle width direction from the left seat rail 6 via a bracket 37 with respect to the seat rail 6. Since they are connected, the seat rail 6 and the second portion 5b of the rising portion 5 are connected to the shock absorber 30.
Can be projected outward in the vehicle width direction without being restricted by the position of the left and right seat rails 6 and the second portion 5.
The arrangement interval of b can be widened.

Therefore, a wide space for installing the fuel tank 15 can be secured between the seat rail 6 and the second portion 5b, and the capacity of the fuel tank 15 can be increased. Therefore, the cruising distance becomes long, and the number of times of refueling can be reduced.

Moreover, since the lower edge portions of the side cover portions 44, 44 have the bent portions 44a, 44a which are bent inward in the vehicle width direction, the rear wheels 28 cover them while the motorcycle is running. Even if muddy water or the like splashed up inside 41 is transmitted along the inner surfaces of the side cover portions 44, 44 and is scattered from the lower edge portion thereof, the muddy water or the like is received by the bent portions 44a, 44a.

Therefore, the muddy water wound up by the rear wheel 28 can be prevented from splashing outward from the lower edge portions of the side cover portions 44, 44 as much as possible, and the stain around the cover 41 can be prevented. it can.

At the same time, the bent portions 44a, 44a
Since the tip of is located on the inner side in the vehicle width direction with respect to the outer surface of the transmission case 24, even if muddy water that cannot be received by the bent portions 44a, 44a is scattered below the cover 41,
The muddy water is guided inward in the vehicle width direction with respect to the outer surface of the transmission case 24. Therefore, muddy water dripping from the inside of the side cover portions 44, 44 is less likely to adhere to the outer surface of the conductive case 24, and the outer surface can be prevented from being soiled.

Further, since the bent portions 44a, 44a of the side cover portions 44, 44 are located inside the outer side surface of the transmission case 24 in the vehicle width direction, when the engine unit 22 swings up and down, the case cover 29 is formed. The upper surface of the is close to the bent portions 44a, 44a. Then, especially at the rear end of the transmission case 24 where the upward swing stroke becomes large, the upper surface of the case cover 29 has the bent portion 44.
a, 44a may be interfered with.

However, in the case of the above construction, since the lower edges of the side cover portions 44, 44 are inclined rearward and upward, as the transmission case 24 advances toward the rear portion thereof, the side cover portions from the upper surface of the case cover 29 are advanced. The lower edges of 44 and 44 move away. Therefore, the bent portions 44a extending inward in the vehicle width direction are formed on the lower edge portions of the side cover portions 44, 44,
Despite forming 44a, this bent portion 44a,
Interference between 44a and the transmission case 24 can be prevented.

At the same time, the shock absorber 30 does not have to enter between the left side cover 44 and the left seat rail 6, so that the shock absorber 30 moves away from the side cover portion 44 inward in the vehicle width direction. Therefore, the side cover 4
It is also possible to prevent interference between the bent portion 44 a of No. 4 and the shock absorber 30.

[0042]

According to the present invention described in detail above, the upper end of one rising portion can be projected to the outside in the vehicle width direction without being restricted by the position of the shock absorber, and the right and left rising portions are correspondingly extended. The arrangement interval of the parts can be widened. Therefore, a wide space for installing the container can be secured between the rising portions, and the capacity of the container can be increased.

Also, while the motorcycle is running, muddy water splashed up by the rear wheels to the inside of the cover will flow downward along the inner surfaces of the left and right side walls of the cover, and will be scattered outward from its lower edge. Even so, this muddy water is received by the bent portion at the lower edge of the cover. For this reason,
It is possible to suppress scattering of muddy water and the like to the outside of the cover. At the same time, even if the muddy water that could not be caught by the bent part is scattered under the cover, this muddy water is guided to the inner side in the vehicle width direction than the outer surface of the transmission case, so the muddy water dripping from the inside of the cover is transferred to the conductive case. It becomes difficult to adhere to the outer side surface of the, and it is possible to prevent the outer side surface from being soiled.

Moreover, since the lower edges of the left and right side walls of the cover are inclined toward the rear of the transmission case and away from the upper surface of the transmission case, muddy water is prevented from splashing on the lower edge of the cover. Despite the formation of the bent portion, it is possible to avoid interference between the bent portion and the transmission case. In addition, since the shock absorber does not have to enter between the side wall and the rising portion of the cover, there is an advantage that the shock absorber can be kept away from the side wall and interference between the bent portion of the side wall and the shock absorber can be prevented.

[Brief description of drawings]

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

FIG. 2 is a side view showing an engine unit mounting structure,

FIG. 3 is a cross-sectional view showing a positional relationship among a shock absorber, a cover, and a frame.

[Explanation of symbols]

 2 ... Head pipe 4 ... Frame pipe (main pipe) 4a ... Low floor part 5 ... Rising part 15 ... Container (fuel tank) 16 ... Seat 22 ... Engine unit 23 ... Engine 24 ... Transmission case 28 ... Rear wheel 30 ... Shock absorber 41 ... Cover 44 ... Side wall (side cover) 44a ... Bent portion

Claims (1)

[Claims] 1. A low floor which is connected to the head pipe and is provided with a pair of frame pipes spaced apart in the left-right direction, the frame pipes extending substantially horizontally rearward through a position lower than the head pipes. Part and a rising part extending upward from the rear end of the low floor part, and a container projecting above the rising part is arranged between the rising parts of the frame pipes, and above the container. The seat and the engine and a transmission case extending rearward from one side of the engine are integrated in the rear of the lower portion of the rising portion, and the rear end portion of the transmission case is provided inside the transmission case. An engine unit having rear wheels driven by the power transmission means housed in the engine unit is arranged, and a front end portion of the engine unit is set to the rising portion. In addition to being connected so as to be swingable downward, a shock absorber is installed between the rear part of the transmission case of this engine unit and the upper end of the one rising part, and the shock absorber, the container, and the surroundings of the rising part. In the scooter type motorcycle in which the cover is covered with a cover connected to the lower part of the seat, the shock absorber has its upper end displaced inward in the vehicle width direction from the upper end of one rising portion, and the cover is , Has left and right side walls protruding in a direction of expanding outward in the vehicle width direction as it goes downward from the upper end on the seat side, and bends the lower edges of these side walls inward in the vehicle width direction, The front end of the left side wall and the lower side edge of the left and right side walls are inclined upward as they move backward. Scooter-type motorcycle to.