JPH11255169A - Cooling structure for scooter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate wasteful consumption for engine power by blowing a cooling wind in response to a temperature condition of an engine, and to enhance an engine cooling capacity. SOLUTION: In cooling structure for a scooter having, in a lower part of a seat 12 in the rear side of a low floor type foot rest part 13, an engine 21 provided in a front side of a rear wheel 15, an engine unit 23 integrally formed with a transmission mechanism provided in one side of the rear wheel 15, and a muffler 30 provided in the other side of the rear wheel 15, a motor-driven fan 34 blowing a cooling wind to the engine 21 is provided in a front side of the engine 21, and the muffler 30 is arranged in a side of the engine in a front side of the rear wheel 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scooter cooling structure, and more particularly to a scooter cooling structure for cooling an engine by cooling air from an electric fan.

[0002]

2. Description of the Related Art A scooter which is a small-displacement motorcycle having simple operability by automatic continuously variable transmission and ease of riding while sitting is mainly used as a short-distance moving means. .

This scooter has a low-floor type footrest portion provided between a steering wheel and a seat, an engine unit integrating an engine on the front side of a rear wheel and a transmission mechanism on a side of a rear wheel, a steering wheel, a seat, and front and rear portions. And a vehicle body cover that covers substantially the entirety except for the wheels. The output of the engine is transmitted to the rear wheels via the transmission mechanism, and the rear wheels are driven.

[0004] The engine is located substantially horizontally with the cylinder head facing forward, the crankshaft is arranged in the vehicle width direction, and a muffler connected to an exhaust pipe from the engine is provided with a rear wheel opposite to the transmission mechanism. It is arranged covering the side. The engine unit has a swing structure in which a rear end portion of a transmission mechanism is supported by a rear spring so as to be swingable up and down with a rear wheel by a support portion near a front engine in the vicinity of the engine. The swing-type engine unit swings up and down with the muffler and the support portion as a fulcrum during traveling. This engine is covered by a vehicle body cover whose front upper part is mounted on both sides of the vehicle body below the seat.

[0005] This engine has a cooling centrifugal fan (framag fan) attached to a flywheel magnet of a crankshaft. The flywheel is mounted on the end of the crankshaft opposite to the transmission mechanism, and a flamag fan is mounted outside the flywheel. A shroud that covers the framag fan and guides cooling air toward the head is provided.
Therefore, there is no space in the engine side opposite to the transmission mechanism, and the muffler is disposed so as to cover the rear wheel side behind the engine as described above.

The engine of the swing type engine unit having such a structure is cooled by the above-mentioned flamag fan.

[0007]

However, since the flamag fan always rotates during the operation of the engine in conjunction with the operation of the engine, even when the engine does not require cooling or when the engine is cold in winter, it does not need to be cooled. When the cooling is not required, a certain amount (about 15 to 20%) of the engine power is wasted due to the rotation of the flamag fan. This loss of engine power has a significant effect, especially for small displacement scooter engines.

Further, the air blown from the flamag fan located at the rear side of the engine is guided to the air passage in the engine unit and is indirectly sent to the engine, so that it is difficult to perform efficient cooling, and the vehicle is not covered by the body cover. As a result, it is necessary to improve the cooling capacity for engines that are hardly directly affected by the traveling wind.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and a cooling structure for a scooter in which cooling air is blown in accordance with the temperature condition of an engine to reduce wasteful consumption of engine power and improve engine cooling capacity. The purpose is to provide.

[0010]

In order to achieve the above object, according to the present invention, an engine provided on the front side of a rear wheel at a lower portion of a seat behind a low-floor type footrest, and an engine provided on one side of a rear wheel. In an engine unit having an integrated transmission mechanism, and a scooter cooling structure having a muffler provided on the other side of the rear wheel, an electric fan for sending cooling air toward the engine is provided in front of the engine. And a cooling structure for a scooter, wherein the muffler is arranged on a side of the engine and in front of a rear wheel.

According to the above configuration, the engine is cooled by the cooling air sent toward the engine by the operation of the electric fan provided in front of the engine. Thus, the cooling of the engine is performed by the electric fan which operates by sensing the heat generated by the engine, so that the engine always rotates when the engine is operating and the engine power is not wasted even when the cooling is unnecessary as in the related art. In addition, it is possible to eliminate wasteful consumption of engine power by blowing air according to the temperature condition of the engine.
In addition, the carburetor located behind the engine with respect to the electric fan is exposed to warm air after depriving the engine of heat, so that icing of the carburetor in cold weather can be prevented.

[0012] According to the above configuration, the muffler is arranged on the side of the engine, and the muffler is located in front of the rear wheel. As a result, the silencer moves closer to the swing fulcrum and the inertial mass of the silencer in the vertical swing is reduced, so that the swinging of the vehicle body is suppressed, the drivability is improved, and the traction of the rear wheel on the road surface is improved, The transmission of the driving force from the rear wheels is improved. Further, the side of the rear wheel opposite to the transmission mechanism is a space, so that the rear wheel can be easily attached and detached. Further, since the engine and the silencer arranged side by side are arranged to face the electric fan, the engine and the silencer can be cooled simultaneously and effectively. In addition, the flow of air blown by the electric fan can be guided between the engine and the muffler, so that the radiant heat of the muffler can be prevented from being transmitted to the engine. Furthermore, a compact engine layout is made possible, and the empty space beside the rear wheel can be effectively used as an article storage space.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a preferred embodiment,
A slit for introducing outside air is formed in the vicinity of the electric fan on a vehicle body cover that covers an engine at a lower portion of the seat, and a rectifying guide is provided around the electric fan for directing air flow from the electric fan toward the engine. Is formed outside the rectifying guide.

With this configuration, the outside air introduced through the slit is directed to the engine by the rectifying guide to direct the wind of the electric fan to the engine, thereby effectively cooling the engine, and the outside air introduced through the slit outside the rectifying guide to the vehicle body cover. The inside is effectively cooled, and the cooling effect of the entire lower part of the seat is enhanced.

[0015] In a further preferred embodiment, a wind guide is provided below the front of the electric fan in a direction intersecting at an acute angle with respect to a blowing direction of the electric fan.

With this configuration, the flow of the wind from the electric fan and the flow of the wind from the air guide are smoothly combined, and the cooling effect on the engine is enhanced.

[0017]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view of a scooter provided with a cooling structure according to an embodiment of the present invention as viewed from the side, and FIG. 2 is a cross-sectional explanatory view of a swing type engine unit portion of the scooter of FIG. 1 as viewed from above. is there. FIG. 3 is an explanatory view of the arrangement of the engine and the silencer in FIG. 1 as viewed from the electric fan side.

As shown in FIGS. 1 and 2, the scooter 10
Has a low-floor footrest 13 provided between the handle 11 and the seat 12, and the handle 11, the seat 12, and the front wheel 1
Substantially the entire body is covered by the vehicle body cover 16 except for the rear wheel 4 and the rear wheel 15. The body cover 16 is
1, a lower front cover 17, a footrest cover 18 forming the footrest 13, and a left / right split rear cover 19 mounted on both sides of the vehicle below the seat 12. Below the seat 12, there is provided a storage box 20 which can be opened and closed by the seat 12 also serving as a lid and can store a helmet or the like. The steering shaft 11 a of the handle 11 is rotatably held by the head pipe 50, and changes the direction of the front wheel 14 via the left and right front forks 51. The main frame 52 is fixed to the head pipe 50, and the rear frame 3 is provided on the left and right of the end of the footrest portion 13, respectively.
1 are combined.

An engine 21 on the front side of the rear wheel 15 and a transmission case 22 having a transmission mechanism on the left side of the rear wheel 15 are integrated below the storage box 20 in the rear cover 19 behind the footrest portion 13. Engine unit 23 is mounted. The engine 21 is positioned substantially horizontally with the cylinder head 25 to which the spark plug 24 is attached facing forward, and the transmission case 22 is connected behind the cylinder 26.
A carburetor 27 is provided behind the cylinder 26, and an air cleaner 28 connected to the carburetor 27 is mounted on the transmission case 22 (see FIG. 1).

The air cleaner 28 is connected to the transmission case 22.
It may be provided on the side of the front engine (see A in FIG. 2). Also in this case, it is desirable to arrange the carburetor 27 behind the cylinder 26 in order to prevent icing (described later).

On the right side of the engine 21 opposite to the transmission case 22, a muffler 30 to which an exhaust pipe 29 from the engine 21 is connected is arranged. The silencer 30 is a rear wheel 1
5, a space is formed on the side of the rear wheel 15 on the opposite side (right side) of the transmission case 22 (see FIG. 2). A detachable article storage case 40 is provided in the space on the side of the rear wheel.
(See FIG. 1).

Engine 2 of a pair of right and left rear frames 31
A bracket 32 is fixed above the bracket 1, a link 33 is connected to the bracket 32, and a support piece 53 of the engine 21 is attached to the link 33 so as to be rotatable around a support shaft 54. Thus, the front side of the engine unit 23 is suspended and supported on the vehicle body frame via the support shaft 54.
The rear side of the engine unit 23 is connected to the lower end of a rear spring 56 via a bracket 55 provided at the rear end of the transmission case 22. Thereby, the engine unit 23
Can swing about the support shaft 54. An axle (not shown) of the rear wheel 15 is also connected to the lower end of the rear spring 56 at the same time. The upper end of the rear spring 56 is fixed to the rear frame 31.

With such a configuration, the engine unit 2
3 has a swing structure capable of swinging around the support shaft 54 at the upper part of the engine by the cushioning action of the rear spring 56 together with the rear wheel 15. In the transmission case 22 of the engine unit 23, as shown in FIG. 2, a continuously variable transmission wheel 57 composed of a tapered groove whose width is variable by centrifugal force is mounted on a crankshaft 58. A similar continuously variable transmission wheel 59 mounted on the rear wheel-side hollow transmission shaft 63 is connected to the continuously variable transmission wheel 57 via a V-belt (not shown). The hollow transmission shaft 63 is connected to the drum 62 according to the number of rotations via the shoe 61, and transmits the rotation of the continuously variable transmission wheel 59 to the shaft 60.
The rotation of the shaft 60 is performed by a rear wheel shaft 64 via a gear (not shown).
To drive the rear wheel 15.

Body cover 1 for covering the front upper part of engine 21
An electric fan 34 driven by an electric motor is mounted inside and inside the engine 6 obliquely in front of the engine 21 (see FIG. 1). The electric fan 34 is attached to a bracket (not shown) connecting the pair of left and right back frames 31, and is located substantially at the center in the vehicle width direction, which is an extension of the arrangement of the cylinder head 25, the cylinder 26, and the carburetor 27. The blowing direction is directed to the upper corner of the cylinder head 25. The electric fan 34 includes a temperature sensor (not shown) disposed near the engine 21 and the engine 2.
When the temperature becomes equal to or higher than a predetermined temperature at which cooling is required by detecting the heat generation temperature of 1, the operation is stopped when the temperature becomes lower than a predetermined temperature at which cooling is not required.

A plurality of slits 35 for introducing outside air into the body cover 16 are formed near the electric fan 34 of the body cover 16 (see FIG. 1). Each slit 35 may be provided with a wind guide louver (not shown) for directing the wind direction of the introduced outside air toward the cylinder head 25. Around the electric fan 34, there is provided a cylindrical rectifying guide 36 that regulates the flow of air and sends the air intensively to a heat radiating portion such as the cylinder head 25 or the cylinder 26. The rectifying guide 36 is disposed across the slit 35 around the electric fan 34 on the way, that is, the slit 35
Is formed outside the rectifying guide 36,
The flow of the wind passing through the outer circumference of the rectifying guide 36 is adjusted, and the air is sent to the radiator.

A wind guide plate 37 is provided above the engine 21 in front of the storage box 20. The air guide plate 37 has a lower end arranged near the upper part of the engine 21 along the front side wall of the storage box 20, and guides outside air that has entered the vehicle body cover 16 from the slit 35 to the upper side of the engine 21. Instead of providing the air guide plate 37,
The front side wall and the bottom wall of the storage box 20 may be formed to have the same guide function as the air guide plate 37.

On the back side of the foot rest cover 18, the foot rest 13 is located slightly below the electric fan 34.
A wind guide 38 is provided to take in outside air flowing along the back surface of the engine and introduce it to the engine 21. Wind guide 3
The front opening 8 opens along the back surface of the foot cover 18 so as to take in the outside air flowing along the back surface of the foot portion 13, and the rear opening does not collide with the air blow from the electric fan 34. , And open to the lower corner of the cylinder head 25. That is, the outside air taken in by the air guide 38 is taken in a V-shape along the direction of the air flow from the electric fan 34 and smoothly merges with the air flow from the electric fan 34 from an acute angle direction without decreasing the flow velocity. Both are sprayed on the cylinder head 25 to obtain a large cooling effect.

Such a wind guide 38 may be formed as a separate part and attached to the lower part of the vehicle body cover 16,
Alternatively, it may be integrally formed as a member integral with the vehicle body cover 16.

In the cooling structure of the scooter 10 having the above-described structure, when the temperature of the engine 21 becomes high and cooling is required, the temperature sensor detects this and the electric fan 34 operates based on the detection signal. By the operation of the electric fan 34, the outside air taken directly from the slit 35 is adjusted in flow by the rectifying guide 36 and the baffle plate 37, and is intensively sent to the heat radiating portion such as the cylinder head 25 or the cylinder 26. The air blown by the electric fan 34 joins the outside air flowing along the back surface of the footrest 13 constantly taken in by the wind guide 38 to effectively cool the radiator.

Therefore, instead of the conventional flamag fan which constantly rotates when the engine 21 is operating and wastes engine power even when cooling is unnecessary, an electric fan 34 which operates by sensing the heat generated by the engine 21 is provided. Therefore, it is possible to eliminate wasteful consumption of engine power by blowing air in accordance with the temperature condition of the engine 21. In particular, a great effect can be obtained for a horizontal cylinder engine such as a small displacement scooter having a large engine power loss ratio. Further, since the outside air introduced by a plurality of different flows on the front side and the back side of the footrest cover 18 is directly applied to the engine 21 for cooling, the cooling capacity is improved, and the traveling wind covered by the body cover 16 is reduced. The engine 21 of the scooter 10, which is hard to receive directly, can be effectively cooled.

The carburetor 27 includes an electric fan 3
4, located on an extension of the arrangement of the cylinder head 25 and the cylinder 26, and the carburetor 27 has a cylinder head 2
Since hot air is blown after the heat has been taken from the cylinder 5 and the cylinder 26, so-called icing, in which the surface of the carburetor 27 cools in cold weather and moisture in the intake air freezes inside the carburetor 27, can be prevented.

Further, by cooling the engine 21 by the above-described electric fan 34, the conventional flamag fan does not need to be provided, and the sound is silenced in the side space of the flywheel magnet 39 of the engine 21 provided with the flammag fan. The vessel 30 can be arranged (see FIG. 2). As a result, the silencer 30 is located in front of the rear wheel 15 such that its rear end is located on the front side of the front end of the rear wheel 15, and the silencer 30 moves closer to the pivot 54. For this reason, the swing inertia mass of the silencer 30 is reduced. By reducing the inertial mass of the silencer 30 in the vertical swing, the vertical swing of the vehicle body is suppressed, driving performance is improved, traction of the rear wheel 15 on the road surface is improved, and transmission of driving force from the rear wheel 15 is performed. Will be better.

Similarly, since the silencer 30 is located in front of the rear wheel 15, the rear wheel 15 on the opposite side of the transmission case 22 is provided.
Is a space on the side, so that the rear wheel 15 can be easily attached and detached. That is, the attachment and detachment of the rear wheel 15 connected to the engine unit 23 is performed by pulling the rear wheel 15 to the opposite side of the transmission case 22 or pushing the rear wheel 15 from the opposite side, but in the conventional scooter cooling structure, Silencer 3 in the direction of its movement
Since 0 was arranged to cover the side surface of the rear wheel, the silencer 30 was in the way, and attaching and detaching the rear wheel 15 was troublesome. In contrast,
In this embodiment, since the silencer does not cover the rear wheel, the operation of attaching and detaching the rear wheel can be facilitated.

As shown in FIG. 3, the muffler 30 is located in front of the rear wheel 15 and the engine 21 and the muffler 30 are arranged side by side in the rear cover 19. The engine 2 to be cooled
1 and the silencer 30 can be cooled simultaneously and effectively. Further, a heat insulating space is provided between the engine 21 and the muffler 30, and the flow of the air blown by the electric fan 34 and the flow of the outside air by the baffle plate 37 can be guided to this space. Can be effectively prevented.

Further, the electric cooling fan 34 is connected to the cylinder head 2 which is a space in the front-rear direction of the vehicle body with a relatively large margin.
5 and accommodated in the vehicle body, and by disposing the silencer 30 in the space beside the engine 21, a compact engine layout is possible. Further, the empty space beside the rear wheel 15 can be effectively utilized by arranging, for example, a storage case 40 (see FIG. 1) suspended on the rear frame.

[0036]

As described above, according to the scooter cooling structure of the present invention, the engine is cooled by the cooling air sent toward the engine by the operation of the electric fan installed in front of the engine. Therefore, the cooling of the engine is performed by an electric fan that operates by sensing the heat generated by the engine.The engine always rotates when the engine is operating, and the engine power is not wasted even when cooling is unnecessary, as in the past.
It is possible to eliminate wasteful consumption of engine power by blowing air according to the temperature condition of the engine. In addition, the carburetor located rearward of the engine with respect to the electric fan is hit by warm air after depriving the engine of heat, so that icing of the carburetor in cold weather can be prevented.

Further, according to the above configuration, the muffler is arranged on the side of the engine, and the muffler is located in front of the rear wheel. The inertial mass in the movement is reduced, the swing of the vehicle body is suppressed, the drivability is improved, the traction of the rear wheels on the road surface is improved, and the transmission of the driving force from the rear wheels is improved. Also,
The space on the side of the rear wheel opposite to the transmission mechanism makes it easier to attach and detach the rear wheel. Further, since the engine and the silencer arranged side by side are arranged to face the electric fan, the engine and the silencer can be cooled simultaneously and effectively.

Further, the flow of the air blown by the electric fan can be guided between the engine and the muffler, so that the radiant heat of the muffler can be prevented from being transmitted to the engine. Furthermore, a compact engine layout is made possible, and the empty space beside the rear wheel can be effectively used as an article storage space.

Further, a slit for introducing outside air is formed in the vicinity of the electric fan in a vehicle body cover that covers the engine below the seat, and a rectifying guide for directing the air flow of the electric fan toward the engine around the electric fan. If a part of the slit is formed outside the rectifying guide, the outside air introduced through the slit will direct the wind of the electric fan to the engine by the rectifying guide to effectively cool the engine. At the same time, the outside air introduced through the slit outside the rectifying guide effectively cools the inside of the vehicle body cover, and the cooling effect of the entire lower portion of the seat is enhanced.

Further, if a wind guide is provided below the front of the electric fan in a direction intersecting at an acute angle with respect to the blowing direction of the electric fan, the flow of the wind by the electric fan and the wind guide are provided. The flow of wind from the air smoothly merges, and the cooling effect on the engine is enhanced.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a scooter provided with a cooling structure according to an embodiment of the present invention as viewed from a side.

FIG. 2 is an explanatory cross-sectional view of the engine unit of the scooter of FIG. 1 as viewed from above.

FIG. 3 is an explanatory diagram showing an arrangement state of an engine and a muffler as viewed from an electric fan side.

[Explanation of symbols]

10: scooter, 11: handle, 12: seat, 1
3: foot rest, 14: front wheel, 15: rear wheel, 16: body cover, 17: front cover, 18: foot rest cover, 1
9: rear cover, 20: storage box, 21: engine, 22: transmission case, 23: engine unit, 2
5: cylinder head, 26: cylinder, 27: carburetor, 28: air cleaner, 30: silencer, 31: rear frame, 34: electric fan, 35: slit, 36:
Rectification guide, 37: wind guide plate, 38: wind guide, 53:
Engine support piece, 54: spindle, 55: bracket, 5
6: Rear spring.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI F01P 5/02 F01P 5/02 B 5/04 5/04 A 5/06 502 5/06 502G

Claims (3)

[Claims] An engine unit in which an engine provided on a front side of a rear wheel and a transmission mechanism provided on one side of a rear wheel are integrated below a seat behind a low-floor type footrest. In a scooter cooling structure having a muffler provided on the other side, an electric fan for sending cooling air toward the engine is provided in front of the engine, and the muffler is provided on a side of the engine and in front of a rear wheel. A scooter cooling structure characterized by being arranged. 2. A rectifying guide for forming an outside air introduction slit in the vicinity of the electric fan on a vehicle body cover that covers an engine below the seat, and for directing air flow from the electric fan toward the engine around the electric fan. 2. The scooter cooling structure according to claim 1, wherein a part of the slit is formed outside the rectifying guide. 3. The scooter according to claim 1, further comprising a wind guide for sending air from a direction intersecting at an acute angle with respect to a blowing direction of the electric fan. Cooling structure.