JP3481050B2 - Frame structure of scooter type vehicle - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small vehicle, in particular, one main pipe extending in a vehicle front-rear direction below a footrest plate on which an occupant's foot is placed, and a front portion rising toward a head pipe, and a seat lower portion. And a pair of left and right rear frames which are juxtaposed to the left and right and whose front portions are respectively inclined forward and downward and are connected to the rear end portions of the main pipes, so that the seat can be supported on these rear frames. The present invention relates to a frame structure of a type vehicle.

[0002]

2. Description of the Related Art In the conventional scooter type vehicle, one bracket is fixedly mounted on a rear end portion of a main pipe extending in the front-rear direction below a footrest plate, and the bracket is provided with front end portions of a pair of left and right rear frames. The parts are connected and supported (see, for example, Japanese Utility Model Publication No. 7-14146).

Further, in a scooter type vehicle, there has already been proposed a structure in which a hollow portion of a rear frame can be used as a cooling air passage to a power transmission mechanism in a power unit (see, for example, Japanese Utility Model Publication No. 1-8478).

[0004]

However, in the conventional structure disclosed in the former publication, since the bracket for connecting the front end portions of the left and right rear frames is relatively small in the vehicle width direction,
The mutual spacing between the front portions of the left and right rear frames (hence the supporting span of the rear frame) is relatively short, and the supporting rigidity of the rear frame for the seat and the like is reduced accordingly.

Moreover, since the front parts of the left and right rear frames are close to each other, it is difficult to thrust the front end part of the rear-wheel drive power unit between them.
It is not possible to reduce the size of the vehicle in the front-rear direction by bringing the power unit closer to the front part of the rear frame (that is, by bringing it closer to the front side of the vehicle body). In order to connect to the section, it was necessary to make the duct length relatively long.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a frame structure for a scooter type vehicle which can solve the problems of the conventional structure.

[0007]

In order to achieve the above object, the invention according to claim 1 extends in the vehicle body front-rear direction below a footrest plate on which an occupant's foot is placed, and a front portion stands up toward a head pipe. A main pipe of a book and a pair of left and right rear frames that are juxtaposed left and right below the seat and have front portions inclined forward and downward and connected to the rear end portions of the main pipes. In a frame structure of a scooter type vehicle capable of supporting the above, a rear end portion of the main pipe and a steel pipe cross pipe extending in the vehicle body left-right direction are integrally connected to each other by penetrating one of them into the other. wear, and the front end portion of the pair of left and right rear frames are connected respectively to the right and left ends of the cross pipe, the main
Insert the power unit for rear-wheel drive into the opening at the rear end of the in-pipe.
The front end of the hanger that swingably supports the front of the
Characterized in that fitted supported through Paraba, also the second aspect of the present invention, in addition to the features of claim 1, wherein one lateral
If the pair of rear frames are made of hollow pipes,
The rear wheel drive power unit between the two rear frames.
The front end of the
In order to introduce cooling air into the case,
At least one of the rear
The lower part of the rear frame and the upper part of the rear frame.
It is characterized by having an intake port that can introduce outside air
It

Furthermore, the invention of claim 3 places the foot of an occupant on the vehicle.
It extends below the foot plate in the vehicle front-rear direction and the front part
One main pipe standing up to Ip and a sea
Side-by-side underneath, and the front part is inclined forward and downward.
A pair of left and right rears connected to the rear end of the main pipe
Frame and the seats are supported on the rear frames.
The frame structure of a scooter type vehicle that can be carried
The left and right sides of the main pipe
Steel pipe cross pipe and one of them penetrates the other
Let them bind to each other integrally, and to the left and right of the cross pipe
The front ends of the pair of left and right rear frames each formed of a hollow pipe are connected to the ends, respectively, and the front ends of the rear-wheel drive power units are inserted between the rear frames, so that the transmission case of the power unit is inside. An intake duct projecting from a front outer surface of the case is connected to a lower portion of at least one of the rear frames in order to introduce cooling air into the case, and an intake port capable of introducing external air is provided in an upper portion of the rear frame. It is characterized by

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be specifically described below based on the embodiments of the present invention illustrated in the accompanying drawings.

1 is a side view showing an outline of an embodiment of a starter to which the present invention is applied.
5 is a schematic plan view of the embodiment (viewed from the arrow 2 in FIG. 1), FIG. 3 is an enlarged sectional view taken along the line 3-3 in FIG. 2, FIG. 4 is an enlarged sectional view taken along the line 4-4 in FIG. 6 is an enlarged sectional view taken along the line 5-5 of FIG.
FIG. 6 is an enlarged sectional view taken along line 6-6 of FIG.

First, in FIGS. 1 and 2, an outer plate P of a scooter type two-wheeled vehicle V is a footrest plate Ps on which an occupant's foot is placed, and a leg shield 1 which rises from a front end portion of the footrest plate Ps.
And a rear outer plate portion Pr that is continuous with the rear end portion of the foot mounting plate Ps and covers the rear wheel drive power unit 2 and the rear wheel Wr from above, and the rear portion thereof. A seat S is disposed in an upper opening of the outer plate portion Pr, and a bottom front end of the seat S is hinged to the rear outer plate portion Pr so as to be openable and closable.

The metal body frame F that supports the outer plate P includes a head pipe H that is in the front outer plate portion Pf and pivotally supports the front wheels Wf, and below the footrest plate Ps. And one main pipe 3 extending in the front-rear direction of the vehicle body and having a front portion rising toward the head pipe H, and arranged in parallel in the rear outer plate portion Pr below the seat S at right and left intervals and in the front half portion. Are integrally provided with a pair of left and right rear frames 4 ₁ and 4 ₂ each of which is inclined forward and downward and is connected to the rear end of the main pipe 3.

The pair of left and right rear frames 4 ₁ and 4 ₂ are each formed of a hollow pipe, and the upper portions thereof, that is, the rear half portions 4r ₁ and 4r ₂ extend substantially linearly in the vehicle front-rear direction immediately below the seat S. The upper and lower cross pipes 5 are integrally connected to each other, and their rear ends are bent inward. The left and right central upper surface of the clear as the upper cross pipe 5 from FIG. 5, inlet 5 for taking external air into the pipe within 5 (hence the rear frame 4 ₁₎
A channel-shaped support plate 6 is fixedly attached to the intake port 5a while opening a upwardly.
A seat catch stay 7 that abuts and supports the front-rear intermediate portion of the bottom plate of the seat S so that the seat S can be contacted and separated is screwed.

A bracket 8 is fixed to the upper cross pipe 5 in the vicinity of the support plate 6 so as to face rearward and downward. An upper end of a rear cushion 9 that elastically supports the power unit 2 is pivotally connected to the bracket 8. It A rear fender Rf that covers the upper portion of the rear wheel Wr is disposed below the rear half portions 4r ₁ and 4r _{2 of} the rear frames 4 ₁ and 4 _2. Above the fender Rf and below the seat S, a rear outer plate is provided. Department Pr
Thus, muddy water or the like splashed by the rear wheel Wr does not enter the vehicle body space surrounded by.

As clearly shown in FIGS. 3 and 4, a rear end portion 3a of the main pipe 3 and a lower cross pipe 10 made of steel pipe extending in the left-right direction of the vehicle body are provided on one side (the cross pipe 10 in the illustrated example) on the other side. (In the illustrated example, the rear end portion 3 of the main pipe
a) is integrally bonded to each other through the lower cross pipe 10, and the front ends of the pair of left and right rear frames 4 ₁ and 4 ₂ are butt-welded to the left and right ends of the lower cross pipe 10, respectively. The lower cross pipe 10 constitutes the cross pipe of the present invention. The rear end 3a of the main pipe 3 is
The cross section is formed in an oblong shape that is flat in the vertical direction, and the flat tubular portion penetrates the lower cross pipe 10 in the front and back thereof and is welded to the pipe 10. A pair of left and right brackets B ₁ and B ₂ are provided between the front end portions of the pair of left and right rear frames 4 ₁ and 4 _{2 and} the front surface of the left and right end portions of the lower cross pipe 10 in order to enhance the coupling strength therebetween. The brackets B ₁ and B ₂ are welded so as to straddle each other, and the rear ends of the left and right stays St ₁ and St ₂ supporting the footrest plate Ps are connected to the brackets B ₁ and B ₂ , respectively.

A front end portion 2a (a head cover portion of the engine E in the illustrated example) of the power unit 2 projects in the vicinity of the lower cross pipe 10 and between the front portions of the pair of left and right rear frames 4 ₁ , 4 _2. Accordingly, it is possible to rear frame 4 _1, 4 ₂ an overall front of the power unit 2 while avoiding interference, that is able to gather on the side closer to the main pipes 3 front-rear direction size of the vehicle.

The power unit 2 is formed by unitizing an engine E and a transmission for shifting the power of the engine E and transmitting the power to the rear wheels Wr, and functions as a swing arm that pivotally supports the rear wheels Wr. The front part of the power unit 2 is connected to the lower cross pipe 1 via the hanger 15.
It is connected and supported so that it can swing up and down. That is, the rear frame 15b of the hanger 15 framed in a substantially rectangular shape is rotatably connected to the support arm 2b projecting below the front end of the power unit 2 via the rubber bush 16 and the support shaft 17 penetrating the rubber bush 16. And the front frame 15a of the hanger 15
Is lower rear frame 4 ₁ and the left and right end portions rear left and right of the cross pipe 10, 4 ₂ front and welded I each extend over a pair of brackets 10b, to 10b, the rubber bush 1
8 and a support shaft 19 penetrating the same 8 are rotatably connected.

Further, a channel-shaped stopper piece 15s having a block-shaped damper bar 20 fixed to the tip thereof is integrally projectingly provided from the center of the front surface of the front frame 15a of the hanger 15, and this stopper piece 15s is shown in the figure. As is clear from FIG. 6, it is fitted and supported in the opening of the rear end portion 3a of the main pipe 3 via the damper bar 20, whereby the hanger 15
The vertical swing around the support shaft 19 is elastically suppressed by the damper bar 20. In this way, the stopper piece 15 that is the front end of the hanger 15 is inserted into the opening of the rear end 3a of the main pipe 3.
The rear end portion 3 by receiving the
Since a can be used as it is as the swing stopper means for the hanger 15, the hanger support structure can be simplified and downsized. Further, in particular, as shown in the illustrated example, by making the rear end portion 3a of the main pipe flat in the vertical direction (hence relatively long in the left and right direction), not only the supporting strength for the lower cross pipe 10 can be increased but also the hanger It is possible to easily absorb the lateral displacement between the rear end portion 3a of the main pipe 15 and the rear end portion 3a of the main pipe 15, and to further improve the vibration damping property of the damper bar 20.

On the left and right sides of the power unit 2,
A transmission case 11 of a winding transmission mechanism M that transmits the power of the engine E to the rear wheel Wr side is integrally provided. On the outer surface of the front end portion of the transmission case 11, a cylindrical inlet 11a for cooling air is provided so as to project, and the inlet 11a and one rear frame 4 (the left side in the illustrated example) facing the inlet 11a. ₁
Between the air outlet 4a ₁ is opened in the bottom wall of the intake duct 12 of the flexible connecting therebetween is interposed.
Further, in the transmission case 11, suction means 13 for forcibly sucking the cooling air from the intake duct 12 is provided.
(In the illustrated example, a suction fan fixed to the side surface of the drive pulley of the transmission mechanism M) is provided.

Next, the operation of the above embodiment will be described. Vehicle V
When the rear wheel Wr bounces due to unevenness of the ground during traveling, the power unit 2 swings up and down around the support shaft 17 at the rear end of the hanger 15 while being buffered by the rear cushion 9 in response to this. At that time, due to the impact force applied to the hanger 15, the hanger 15 itself tends to slightly swing around the support shaft 19 on the lower cross pipe 10 side (see the chain double-dashed line in FIG. 3).
The movement is buffered because the stopper piece 15s at the front end of the hanger 15 is elastically engaged with the opening of the rear end portion 3a of the main pipe via the damper bar 20.

The engine E in the power unit 2
The suction means 13 in the transmission case 11 is actuated in accordance with the driving of the vehicle, and the suction action of the suction means 13 causes the intake port 5a and the upper cross pipe 5 from the vehicle body space immediately below the seat S.
Among them, one of the rear frame 4 within _1, is introduced outside air into the transmission case 11 through the air outlet 4a ₁ and the intake duct 12 to cool the transmission mechanism M, then the exhaust port provided in place of the power unit 2 ( (Not shown) is discharged to the outside.

The front portions of the left and right rear frames 4 ₁ , 4 ₂ are supported by the rear end portion 3a of the main pipe 3 through a lower cross pipe 10 made of steel which is orthogonal to the pipe 3 and is supported thereby. Left and right rear frames 4 ₁ , 4
_Since it is possible to secure a relatively long distance between the _two (hence, the support span of the rear frame), the left and right rear frames 4 can be manufactured while reducing the weight and cost of the frame structure.
_1, 4 ₂ of the sheet S, the rear outer plate Pr, the rear cushion 9
It is possible to effectively increase the support rigidity for the left and right rear frames 4 ₁ and 4 ₂ and to widen the mutual interval between the front portions of the left and right rear frames 4 ₁ and 4 ₂ so that the front end portion 2 a of the rear wheel drive power unit 2 can be comfortably disposed therebetween. It is possible to make it plunge in, and the power unit 2 can be moved to the front side as much as possible while avoiding interference with the rear frames 4 ₁ , 4 ₂ .

Further the front end portion of the left and right rear frames 4 _1, 4 ₂ of the power unit 2 between the front each other as in the illustrated example 2
It is to plunge the a, since the intake duct 12 protruding from the transmission case 11 the outer surface of the power unit 2 may be closer to the rear frame 4 _1, 4 ₂ lower,
The duct length can be shortened by that much, and the rear frames 4 ₁ , 4 ₂
Can be introduced efficiently clean outside air reaches the duct 12 through the rear frame 4 _1, 4 in ₂ from the upper into the transmission case 11.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments and various embodiments can be made within the scope of the present invention. For example, although the above embodiment is a scooter type two-wheeled vehicle, the present invention may be implemented in a scooter type three-wheeled vehicle. Further, in the above-described embodiment, the intake port 5a to be provided on the upper portions of the rear frames 4 ₁ and 4 ₂ is provided on the upper surface of the upper cross pipe 5 which connects the left and right rear frames 4 ₁ and 4 ₂ and the support plate 6 for the seat catch stay. of showed that opens downward, the position of the inlet of the present invention so as to the embodiment is not limited to the example, for example, one of the rear frame 4 _1, 4 ₂ opening the intake port directly on top Good. It should be noted that, in order to avoid intrusion of muddy water or rainwater splashed by the rear wheels and to take in only clean outside air from the intake port, it is opened upward in the vehicle body space immediately below the seat S surrounded by the rear outer plate Pr. Is desirable.

Further, in the above-described embodiment, the rear end portion 3a of the main pipe is penetrated through the cross pipe 10 in the front and rear thereof. On the contrary, the cross pipe 10 is penetrated in the left and right sides of the rear end portion 3a of the main pipe. You may allow it.

[0026]

As described above, according to each of the first to third aspects of the present invention, the front ends of the left and right rear frames are connected to the rear ends of the main pipes through the cross pipe made of steel pipe which is relatively lightweight and inexpensive and has a high bending strength. Since it is supported by the parts, the mutual distance between the left and right rear frames (hence the supporting span of the rear frame) at the supporting parts can be set to be sufficiently long, and therefore the frame structure can be made lighter and the cost can be reduced. ,
It is possible to effectively increase the support rigidity of the seat and the like by the left and right rear frames. Moreover, by widening the space between the front parts of the left and right rear frames, the rear wheel drive power unit whose front end faces the front parts can be moved to the front side as much as possible while avoiding interference with the rear frame. It is possible to reduce the size in the front-rear direction.

According to the first aspect of the invention, the front end of the power unit hanger and the damper bar are housed in the opening at the rear end of the main pipe, and the main pipe itself is used as a stopper means for the hanger. Since it is possible, the hanger support structure can be simplified and downsized.

[0028] According particularly to the invention of claim 2, 3,
By inserting the front end of the rear-wheel drive power unit between the front parts of the left and right rear frames, the power unit can be moved closer to the front side of the vehicle body, and further, the intake duct protruding on the outer surface of the power unit transmission case. Can be brought closer to the lower part of the rear frame, so that the length of the duct can be shortened. Therefore, clean outside air that has entered the duct from the upper part of the rear frame through the inside of the rear frame can be efficiently introduced into the transmission case. it can.

[Brief description of drawings]

FIG. 1 is an overall side view showing the outline of an embodiment of a starter to which the present invention is applied.

FIG. 2 is a schematic plan view of the above-described embodiment (a view from arrow 2 in FIG. 1).

FIG. 3 is an enlarged sectional view taken along line 3-3 of FIG.

FIG. 4 is an enlarged sectional view taken along arrow 4-4 of FIG.

5 is an enlarged sectional view taken along the line 5-5 of FIG.

6 is an enlarged sectional view taken along the line 6-6 of FIG.

[Explanation of symbols]

H ... Head pipe Ps ... Foot mounting plate S ... Seat 2 ... Power unit 3 ... Main pipe 3a ... Rear end 4 ₁ , 4 ₂ · Rear frame 5a ··· Intake port 10 ··· Lower cross pipe 11 as cross pipe · · Transmission case 12 · · Intake duct 15 · · · Hanger 15s · Front end Stopper piece 20 as a ...

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B62K 11/10 B62K 19/20

Claims (3)

(57) [Claims] 1. A main pipe (3), which extends below the foot plate (Ps) on which the occupant's feet are placed and which extends in the vehicle front-rear direction and whose front portion rises toward the head pipe (H), and a seat (S). ) A pair of left and right rear frames (4 ₁ , 4 ₂ ) are arranged side by side below and are connected to the rear end portion (3a) of the main pipe (3) with the front portions respectively inclined forward and downward. In the frame structure of the scooter type vehicle in which the seat (S) can be supported on the rear frames (4 ₁ , 4 ₂ ), the rear end portion (3a) of the main pipe (3) and the vehicle body left-right direction a steel pipe of the cross pipe (10) extending, and bound together into each other by penetrating the other on one, the pair of left and right rear frames (4 ₁ to the right and left end portions of the cross pipe (10), 4 ₂₎ the front end was ligated respectively, the
The rear wheel is placed in the opening at the rear end (3a) of the main pipe (3).
The front part of the driving power unit (2) is swingably supported.
The front end (15s) of the hanger (15)
A frame structure for a scooter type vehicle, which is fitted and supported through (20) . 2. The pair of left and right rear frames (4 ₁ , 4)
₂ ) consists of hollow pipes, and both rear
A rear wheel drive power unit is installed between the frames (4 ₁ , 4 ₂ ).
Insert the front end (2a) of the
Guide cooling air into the transmission case (11) of the knit (2)
Intake that protrudes from the outer surface of the front of the case (11) to be inserted
At least one of the rear frames is provided with a duct (12).
Connected to the lower part of (4 ₁ ) and further to the rear frame
At the upper part of (4 ₁ , 4 ₂ ) is an intake port (5
The frame structure for a scooter type vehicle according to claim 1, wherein a) is provided . 3. Below a footrest plate (Ps) on which an occupant's foot is placed.
Extends in the front-rear direction of the car body and the front part becomes the head pipe (H)
One main pipe (3) standing up, and a sea
To the left and right side by side,
Beveled and connected to the rear end (3a) of the main pipe (3)
Equipped with a pair of left and right rear frames (4 ₁ , 4 ₂ )
Eh, seat on those rear frames (4 ₁ , 4 ₂ )
A frame of a scooter type vehicle that can support (S)
In arm structure, the rear end portion of the main pipe (3) and (3a), the vehicle body left-right
With a steel pipe cross pipe (10) extending in the direction
One of them is pierced through the other, and they are integrally bound to each other.
At the left and right ends of the pipe (10),
Configuration the pair of left and right rear frames (4 _1, 4 ₂₎
The front end portions are connected to each other, and the front end portion (2a) of the rear wheel drive power unit (2) is thrust between the rear frames (4 ₁ , 4 ₂ ) of the rear frame portions (4 ₁ , 4 ₂ ) so that the transmission case (1) of the power unit (2) is connected. connected to a lower portion of at least one of the rear frame an intake duct which projects from the front outer surface (12) of the casing in order to introduce cooling air into 1) the (1 1) (4 _1), further wherein the rear frame At the upper part of (4 ₁ , 4 ₂ ) is an intake port (5
A frame structure of a scooter type vehicle characterized in that a) is provided.