JPH07102831B2 - Cooling device for scooter type vehicle - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device in a rear cover, which is applied to a vehicle in which an engine and a rear wheel below a driving seat are covered with a rear cover.

(Background of the Invention) In a vehicle such as a two- or three-wheeled scooter, an engine and a rear wheel are arranged below a driving seat, and the engine and the rear wheel are covered with a rear cover. In this case, the hot air of the engine is likely to be trapped inside the rear cover, and it is desired to improve the cooling performance inside the rear cover. In this type of vehicle, conventionally, there is a vehicle in which an opening is provided in the left and right side surfaces or a rear surface of a rear cover below a driving seat, and hot air in the rear cover is discharged from the opening. However, in this case, there is a problem that the exhaust force of the hot air from the opening tends to be insufficient and the inside of the rear cover is hard to cool sufficiently. In particular, immediately after the vehicle stopped, there was a problem that the temperature inside the rear cover was likely to rise excessively due to the residual heat of the engine.

(Object of the invention) The present invention has been made in view of the above circumstances, and increases the suction force of hot air in the rear cover during traveling, and enhances the effect of discharging the hot air even immediately after the vehicle is stopped, thereby improving the rear cover. An object of the present invention is to provide a vehicle cooling device that can improve the cooling performance of the inside.

(Structure of the Invention) According to the present invention, an object of the present invention is to provide a scooter type vehicle including an engine and rear wheels arranged below a driving seat, and a rear cover that covers the engine and the rear wheels.
A flange portion protruding to the outside of the vehicle body extends obliquely rearward from the rear side edge of the footrest along the side surface of the rear cover and the rear lower edge of the driving seat to a position higher than the seating surface of the driving seat, The cooling device for a scooter type vehicle is characterized in that an outlet for cooling air in the rear cover is opened in the vicinity of a flange portion along the lower rear edge of the operating seat.

That is, the flange portion is projected to the outside of the vehicle body, and the traveling wind is guided from the rear portion of the footrest to the tilted rearward, that is, the rear portion of the rear of the driver's seat by this flange portion, and the inside of the rear cover is provided from the discharge port provided substantially along the passage of the traveling wind. The air is discharged. At this time, since the flange portion extends to a position higher than the seating surface of the driver's seat, the traveling wind guided to the flange portion is smoothly guided to the rear by the negative pressure generated behind the driver's seat and behind the driver's back. Therefore, the hot air inside the rear cover is also smoothly discharged from the discharge port. In addition, at the time of stopping,
Hot air in the rear cover is discharged to the outside through the discharge port located at this high position.

(Embodiment) FIG. 1 is a right side view of a two-wheel scooter which is an embodiment of the present invention, FIG. 2 is its rear view, and FIG. 3 is III in FIG.
-III line sectional view, FIG. 4 is a plan view showing the flow of cooling air,
5 and 6 are a side view and a plan view showing the concept of the vehicle body shape.

In FIGS. 1 and 4, reference numeral 10 is a frame. This frame 10
Includes a steering shaft tube 12, a front frame 14, and a pair of left and right rear frames 16 (16a, 16b) extending obliquely upward and rearward from the lower end of the front frame 14.

Reference numeral 18 denotes a power unit in which a forced air cooling type two-cycle engine 20 and a transmission case 22 are integrally assembled. A front portion of the transmission case 22 is vertically swingably connected to the rear frame 16 via a link 24. The rear portion of the transmission case 22 is elastically supported by the buffer unit 26. 28 is a rear wheel attached to the rear portion of the transmission case 22, 30 is an intake air purifier attached to the upper surface of the transmission case 22 (Fig. 2), and 32 is a side opposite to the transmission case 22 with the rear wheel 28 interposed therebetween. It is a muffler arranged in.

A fuel tank 34 is fixed to the rear frame 16 so as to be located above the power unit 18. 36
Is a lubricating oil tank mounted behind the fuel tank 34.

A steering shaft (not shown) is rotatably held in the steering shaft cylinder 12, and a steering bar handle 38 is fixed to the upper end of the steering shaft. A handle cover 40 is attached to the steering bar handle 38, and the upper center portion of the handle cover 40 has a windshield 42.
Has become.

A pair of left and right front forks 44 (only one of which is shown) is fixed to the lower end of the steering shaft. Steering front wheels 46 are rotatably attached to the front forks 44 via a bottom link type suspension device. The front fork 44 is provided with a substantially hemispherical wheel cover 47 that covers the left and right side surfaces of the front wheel 46, thereby reducing air resistance.

48 is a driving seat. This driving seat 48 is a fuel tank
It is mounted so that it can be opened and closed with the front end as a fulcrum so as to cover the upper part of 34. The driving seat 48 includes a seating portion 50 that supports the weight of the driver from below and a backrest portion 52 that supports the vicinity of the lumbar spine of the driver. The backrest portion 52 is formed in a substantially fan shape so that the width thereof is narrow at its lower portion and wide at its upper portion. The front surface of this wide upper portion is curved in an arc shape that opens forward when viewed from above, and securely holds the driver's body.

Incidentally, 54 is a substantially flat plate-shaped footrest located below the steering bar handle 38 in the handlebar cover 40 and the driver's seat 48, and an upper part thereof is a footrest space 56 that crosses the vehicle body in the left-right direction.
Has become. Reference numeral 58 is a rear cover that covers the upper side of the power unit 18 and the rear wheel 28, and 60 is a leg shield that covers the front portion of the steering shaft tube 12 and the front frame 14 from the front and rear. 62 is a tail light assembly incorporated in the lower rear part of the rear cover 58,
The tail lamp assembly 62 is formed in a substantially triangular shape that is convex upward when viewed from the rear (see FIG. 2).

The rear cover 58 is formed so that the tail lamp assembly 62 and the outer surface thereof are smoothly continuous. These rear covers 58
The rear edge of the outer surface of the tail lamp assembly 62 and the tail lamp assembly 62 is formed so as to rise from the tail lamp assembly 62 at the lower portion thereof toward the upper front at a steep angle and to bulge rearward in a side view substantially arcuate shape. The left and right side surfaces of the outer surface are smoothly curved so as to approach each other toward the trailing edge of the outer surface.

The lower edge of the rear cover 58 and the tail lamp assembly 62 is formed substantially linearly from the rear of the footrest 54 to the upper rear, and the rear fender 64 is fixed to the lower edge. After this fender 64
Covers the lower surface of the vehicle body from the lower surface of the footrest 54 to just before the rear wheel 28, while the left and right side surfaces thereof are the transmission case 22 and the muffler 32.
Notched to avoid interference with. Rear fender 64
A license plate 66 is attached to the rear surface.

The upper portion of the rear cover 58 extends above the seating surface of the seat portion 50 integrally with the rear surface of the seat 48 behind the driver seat 48, and the extending portion 68 is smoothly continuous to the back rest portion 52. There is. Therefore, a space is not formed between the extending portion 68 and the rear surface of the driver when viewed from the side. As shown in FIG. 2, the extending portion 68 is formed in a mountain shape when viewed from the rear, and a plurality of discharge ports 70 are opened so as to be directed rearward along the edge of the mountain shape. As a result, most of these discharge ports 70 are located sufficiently higher than the seating surface of the seat 50.
In addition, the rear seat 58 and the backrest 52 have a driving seat 48
As shown in FIG. 3, a flange portion 72 protruding laterally is formed along the lower rear edge of the rear portion. That is, as is apparent from FIGS. 1 and 4, the flange portion 72 extends obliquely upward and rearward from both sides of the rear portion of the footrest 54 on both side surfaces of the rear cover 58, and extends along the rear lower edge of the driving seat 48. Reach a position higher than the seat 50. A part of the discharge port 70 opens near the flange 72 along the lower rear edge of the operation seat 48. Of the discharge ports 70, those close to the flange 72 are opened in the recesses behind the flange 72.

The front part of the footrest 54 has a large opening behind the front wheel 46, and this opening serves as a cooling air inlet 74.

The vehicle body shape of the embodiment is made based on an elliptical shape as shown in FIGS. That is, when viewed from the side (fifth
Figure), the front edge of the leg shield 60, the front edge of the rear cover 40 and the windshield 42, the rear edge of the back support 52, the side surface of the rear cover 58,
A curve connecting the lower edges of the footrests 54 is almost along the ellipse A which rises backward. Therefore, the flange 72 substantially follows the shape of the ellipse A, and the traveling wind is smoothly guided obliquely upward and rearward along the ellipse A, that is, the flange 72. The side edge of the leg shield 60, the side of the handle cover 40, the upper side of the backrest 52, the rear edge of the rear cover 58, the rear edge of the tail light assembly 62, the rear fender 64.
A curve connecting the lower surface of the footrest table 54 and the front lower edge of the footrest 54 is substantially along a pair of left and right downward ellipses B. Seen from the plane (6th
(Fig.), The front lower edge of the handle cover 40 and the upper rear surface of the rear cover 58 are substantially along the ellipse C which is long in the front-rear direction.
The upper part of 40 and the upper part of the backrest part 52 substantially follow an ellipse D that is nearly circular.

As a result, a seating space along the substantially ellipse E suitable for a comfortable seating of the driver is secured at a position surrounded by these ellipses A to D, and a large seating space can be obtained while reducing the outer surface of the vehicle body. is doing.

According to this embodiment, during traveling, a large amount of traveling wind enters from the cooling air inlet 74, further passes through the inside of the footrest 54 and enters the inside of the rear cover 58. The heat of the engine 20 and the like is carried upward and rearward by this cooling air. Since a large traveling negative pressure is generated behind the driver during traveling and no space is formed between the rear surface of the driver and the extension portion 68, the rearward opening of the driver is directed. The hot air in the rear cover 58 is strongly sucked out from the exhaust port 70. Therefore, the flow rate of cooling air inside the rear cover 58 is increased, and the cooling performance inside the rear cover 58 is improved.

Further, since the position of the exhaust port 70 is sufficiently higher than the positions of the inflow port 74 and the engine 20, the cooling air heated in the rear cover 58 and having a smaller specific gravity rapidly rises to the exhaust port 70.
Emitted from. That is, the same effect as the chimney can be obtained. For this reason, the ventilation inside the rear cover 58 is naturally and strongly performed not only while the vehicle is running but also when the vehicle is stopped.
The inside of the 58 can be prevented from heating.

In this embodiment, the flange portion 72 is formed in the upper front portion of the rear cover 58 and the lower portion of the backrest portion 52 (Fig. 3), and a part of the exhaust port 70 is opened behind the flange portion 72.
Exhaust effect is further improved by the traveling negative pressure generated behind 72. Also, the vicinity of the extension 68 is located near the lower part of the backrest 52, and since it is formed with a narrow width, traveling wind easily flows behind this behind the driver, and the flow velocity accelerates near this. To be done. Therefore, a larger suction effect can be obtained at the exhaust port 70.

Although the extending portion 68 is formed integrally with the rear cover 58 in this embodiment, the present invention also includes the extending portion 68 which is separate from the rear cover. Further, the present invention also includes the one in which the backrest portion 52 is omitted.

(Effects of the Invention) As described above, according to the present invention, the flange portion projecting to the outside of the vehicle body is made to extend from the rear side edge of the footrest to the side surface of the rear cover and the lower rear edge of the driving seat to a position higher than the seating surface of the driving seat. Since it extends obliquely upward and rearward, the traveling wind smoothly flows upward and rearward of the operation seat along the flange portion. Since the exhaust port is formed near the flange portion along the lower rear edge of the operation seat, the hot air in the rear cover is smoothly exhausted from the exhaust port by the traveling wind flowing along the flange portion. In particular, during traveling, a negative pressure is generated in the rear part of the driver's seat and the back surface of the driver, and this negative pressure further promotes exhaust from the exhaust port. Further, since the exhaust port is high, the high-temperature cooling air inside the rear cover can be exhausted by the same effect as the chimney. As a result, the cooling effect inside the rear cover can be enhanced not only when the vehicle is running but also when the vehicle is stopped.

[Brief description of drawings]

FIG. 1 is a right side view of a two-wheel scooter which is an embodiment of the present invention, FIG. 2 is its rear view, and FIG. 3 is III in FIG.
-III line sectional view, FIG. 4 is a plan view showing the flow of cooling air,
5 and 6 are a side view and a plan view showing the concept of the vehicle body shape. 20 ... engine, 28 ... rear wheel, 48 ... driving seat, 50 ... seat part, 58 ... rear cover, 68 ... extension part, 70 ... exhaust port, 72 ... flange part.

Claims (1)

[Claims] 1. A scooter-type vehicle including an engine and rear wheels arranged below a driver's seat, and a rear cover for covering the engine and the rear wheels, wherein a flange portion projecting to the outside of the vehicle body has a rear side edge of a footrest base. Extending obliquely upward and rearward to a position higher than the seating surface of the driving seat along the side surface of the rear cover and the rear lower edge of the driving seat, and inside the rear cover near the flange portion along the rear lower edge of the driving seat. A scooter-type vehicle cooling device having a cooling air discharge opening.