JPH11171079A - Belt automatic transmission cooling device for scooter type vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a belt automatic transmission cooling device for a scooter type vehicle preventing foreign matter rolled up by a rear wheel, from entering space surrounded by a body cover and a seat. SOLUTION: The rear part of a vehicle body is covered with a body cover 11. A rider's seat 10 is disposed at an upper part of the body cover 11, and a unit swing type engine 14 is disposed at a lower part of the body cover 11. An opening part at the lower part of the body cover 11 is closed with a rear fender 34 so as to form closed space 35 by the body cover 11, rider's seat 10 and rear fender 34. A belt type automatic transmission is provided in a belt chamber 25 in the unit swing type engine 14, and outside air is led into the belt chamber 25 to cool the belt type automatic transmission. In a scooter type vehicle 1 of such constitution, an air pipe 44 for leading outside air into the belt chamber 25 is connected, and an outside air intake port 43 of this air pipe 44 is arranged in the closed space 35. An insert-through part 47 of the air pipe 44 is formed at the rear fender 34.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic belt cooling device for a scooter type vehicle.

[0002]

2. Description of the Related Art For example, there is a unit swing type engine used for a scooter type vehicle equipped with a belt type automatic transmission.

The belt-type automatic transmission is housed in a belt chamber in a transmission case, and has a heat generating portion such as a contact portion between a drive pulley and a driven pulley and a V-belt, so that the temperature in the belt chamber easily rises. Become. In particular, when the conduction case is made compact, the tendency is increased, and the V-belt has a problem that deterioration is accelerated by heat generation.

Therefore, an outside air intake is provided in the conduction case,
There is a type in which outside air is introduced into the belt chamber from the outside air intake to cool the heat generating portion.

As an example of a cooling device for an automatic transmission, as shown in Japanese Patent Publication No. 62-29276, for example, an outside air intake port is formed on a transmission cover surface, and the outside air intake port is connected to this intake port via a connecting pipe. Connect the tubes and
In some cases, the outside air suction port at the tip of the outside air suction tube is opened in a space surrounded by a vehicle body cover and a seat.

The outside air suction port at the tip of the outside air suction tube is fixed to the vehicle body cover. However, since the unit swing type engine swings up and down around a pivot axis according to the road surface condition, the outside air suction tube is flexible. Those having properties are used.

[0007]

By the way, a rear fender is provided above the rear wheel in order to prevent foreign matters such as mud and water which wind up by the rear wheel from entering the space surrounded by the vehicle body cover and the seat. ing. The outside air suction tube extends into the space through a hole provided in the rear fender.

However, since the outside air suction tube frequently moves depending on the road surface condition, unless the hole provided in the rear fender is formed slightly larger than the tube diameter, the outside air suction tube may rub against the hole and be damaged. There is a fear.

On the other hand, by forming the above hole larger than the tube diameter, there is a possibility that foreign matter such as mud or water which the rear wheel rolls up may enter the space surrounded by the vehicle body cover and the seat from a gap formed there. .

The present invention has been made in consideration of the above circumstances, and has an automatic belt shifter for a scooter-type vehicle in which foreign matter wound by a rear wheel is prevented from entering into a space surrounded by a vehicle body cover and a seat. It is an object of the present invention to provide a cooling device for a machine.

[0011]

According to the present invention, there is provided a scooter-type vehicle automatic belt cooling device for a belt-type automatic transmission according to the present invention. Cover the vehicle seat with the driving seat at the top and the unit swing type engine at the bottom, and close the opening at the bottom of the body cover with a rear fender to form a closed space with the body cover, the driving seat and the rear fender. A scooter-type vehicle, wherein a belt-type automatic transmission is provided in a belt chamber of the unit swing type engine, and external air is introduced into the belt chamber to cool the belt-type automatic transmission. An air guide pipe for introducing outside air into the room is connected, and an outside air suction port of the air guide pipe is arranged in the closed space. It is obtained by forming an insertion portion of the Shirubeki pipe rear fender.

In order to solve the above-mentioned problem, the air guide pipe is divided into a connecting tube outside the closed space and a cooling duct in the closed space. The cooling duct and the connecting tube are connected by the insertion portion, and a sealing portion is provided at a connecting portion between the cooling duct and the connecting tube to seal the closed space from the outside.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a left side view showing an example of a scooter type vehicle to which the present invention is applied. As shown in FIG. 1, the scooter-type vehicle 1 has a body frame 2. The body frame 2 has a pair of upper and lower down tubes 3 and a pair of left and right rear tubes extending rearward from the rear ends of the down tubes 3. And a frame 4.

A head pipe 5 is provided at the front end of the down tube 3. The head pipe 5 is provided with a front fork 7 and a handlebar 8 for rotatably supporting the front wheel 6, and the handlebar 8 allows the front wheel 6 to be steerable to the left and right.

An article storage room 9 capable of storing a helmet or the like is provided above the rear frame 4, and a driving seat 10 is installed above the article storage chamber 9 so as to be openable and closable. And
The body frame 2 is covered by a body cover 11 around it.

FIG. 2 is an enlarged side view of the rear part of the vehicle body. As shown in FIGS. 1 and 2, a pair of left and right reinforcing plates 12 are provided at a joint portion of the body frame 2, for example, between the down tube 3 and the rear frame 4, and a pivot shaft provided between these reinforcing plates 12. A front upper portion of a unit swing type engine 14 is pivotally connected to a swing 13 via a link 15.

The unit swing type engine 14 includes an engine body 16 and a conduction case 17 extending rearward from one side of the engine body 16. This conduction case 17
Also serves as a swing arm, and is elastically supported by the vehicle body frame 2 by a rear shock absorber 18 provided at the lower center of the down tube 3. Then, a rear wheel 19 as a driving wheel is held at the rear end of the transmission case 17.

A carburetor 20a constituting the engine intake system 20 is connected to the engine body 16, and an air cleaner 20b also constituting the engine intake system 20 is connected upstream of the carburetor 20a. The carburetor 20a and the air cleaner 20b are arranged, for example, in front of and above the engine body 16, and swing integrally with the unit swing type engine 14. Further, a fuel tank 21 is arranged at a lower front part of the engine intake system 20.

FIG. 3 is a plan sectional view of the unit swing type engine 14 taken along the line III-III in FIG. FIG.
As shown in FIG. 1, an engine body 16 is arranged at the front of the unit swing type engine 14. In the engine body 16, the reciprocating motion of a piston (not shown) in a cylinder (not shown)
This is for rotating the crankshaft 23 pivotally supported in 6a.

On the other hand, the conductive case 17 is covered with a conductive case cover 24 to form a belt chamber 25 therein.
A belt-type automatic transmission 26 is disposed in the belt chamber 25.

A drive pulley 27 of a belt type automatic transmission 26 is attached to the left end side of the crankshaft 23, and a driven pulley 29 is
The driving force of the engine body 16 is transmitted to the engine. The driven pulley 29 is rotatably supported by a driven shaft 30 provided at a rear portion of the transmission case 17, and the rotational driving force transmitted to the driven pulley 29 is applied to the driven shaft 30 via a centrifugal clutch mechanism 31, for example. Is transmitted to

The driven shaft 30 is connected to a rear axle 33 through a transmission mechanism 32 which is a gear reduction mechanism and a power transmission device, and the driving force of the engine body 16 is transmitted to the rear wheel 19 via the transmission mechanism 32. It has become.

FIG. 4 is a sectional view taken along the line IV-IV of FIG. As shown in FIG. 1, FIG. 2 and FIG.
Above the rear fender 34 is provided a rear fender 34 for preventing foreign substances such as mud and water wound by the rear wheel 19 from entering the space surrounded by the vehicle body cover 11 and the driving seat 10.

The rear fender 34 mainly includes a fender body 34
a and an extension section 34b. The fender body 34a is, for example, a plate-like member that closes an opening at a lower portion of the vehicle body cover 11, and forms a closed space 35 by the vehicle body cover 11, the driving seat 10, and the fender body 34a. A chamber 9 is arranged.
The rear wheel 19 is located substantially at the center of the fender body 34a.
A concave portion 36 that is concave upward in an arc shape is formed along the shape of. Then, the fender body 34a is fixed to the rear frame 4 with bolts 37 or the like.

On the other hand, the extension portion 34b of the rear fender 34 extends rearward and downward from the rear end portion of the fender body 34a, and prevents the mud and the like that the rear wheel 19 jumps from scattering upward and rearward. The extension portion 34b is coupled to the fender body 34a with a screw 38 or the like, and is further fixed together with the fender body 34a to the rear frame 4 with a bolt 37 or the like.

The contact portion between the drive pulley 27 and the driven pulley 29 of the automatic belt transmission 26 and the V-belt 28 generates heat due to friction, and the temperature in the belt chamber 25 easily rises. The automatic belt transmission 26 is provided with a cooling device 39.

The structure of the cooling device 39 is as follows.
That is, as shown in FIG.
An intake fan 40 is formed integrally with the drive pulley. An intake port 41 is formed near the intake fan 40 of the conductive case cover 24. Then, as shown in FIGS. 2 and 3, an outside air intake pipe 42 is connected to the intake port 41 of the conductive case cover 24.

On the other hand, an outside air suction port 43 is arranged in the closed space 35, and the outside air suction port 43 and the outside air intake pipe 42 are connected by an air guide pipe 44. The air guide pipe 44 is divided into a connecting tube 45 outside the closed space 35 and a cooling duct 46 inside the closed space 35, and the connecting tube 45 is formed of a material having flexibility and elasticity.

An insertion portion 47 is formed in the fender body 34a so as to be recessed upward adjacent to the recess 36. Then, the above-described cooling duct 46 and connecting tube 4
5 is connected at this insertion portion 47. For more information,
For example, an end of the cooling duct 46 is inserted into the insertion portion 47, and a portion exposed to the outside is inserted into an end of the connection tube 45. Further, a flange 48 serving as a seal portion is integrally formed inside the insertion portion 47 of the cooling duct 46, and the flange 48 is fixed so as to be in close contact with the insertion portion 47, and the cooling duct 46 is attached to the fender body 34a. Fixed.

Next, the operation of the present embodiment will be described.

The crankshaft 23 of the engine body 16
Rotates, and the drive pulley 2 attached to the end thereof
The rotation of the intake fan 40 provided in 7
Body cover 11, driving seat 10, and fender body 34a
The outside air in the closed space 35 formed by the
Through the cooling duct 46, the connecting tube 45, and the air guide pipe 44 composed of the outside air intake pipe 42, the air is guided into the belt chamber 25 from the air inlet 41 of the conductive case cover 24, and the drive pulley 27 and the driven pulley 29 Each part of the automatic transmission 26, such as a contact portion with the V-belt 28, is cooled.

An air guide pipe 44 connecting the outside air suction port 43 and the suction port 41 of the conductive case cover 24 is closed by a closed space 35.
Outer connecting tube 45 and cooling duct 4 in closed space 35
6, the cooling duct 46 and the connection tube 45 are connected by an insertion portion 47 formed in the fender body 34a, and a flange 48 is formed inside the insertion portion 47 of the cooling duct 46. Since the closed space 35 is sealed from the outside by being brought into close contact with the insertion portion 47, there is no possibility that foreign matter such as mud or water that the rear wheel 19 rolls up may enter the closed space 35.

Further, even if the unit swing type engine 14 swings up and down around the pivot shaft 13 according to the condition of the road surface, only the connecting tube 45 outside the closed space 35 is interlocked. Is made of a material having flexibility and elasticity, there is no problem that the connecting tube 45 is damaged.

[0035]

As described above, according to the cooling system for a belt automatic transmission of a scooter type vehicle according to the present invention, the rear part of the vehicle body is covered with the vehicle body cover, the driving seat is provided above the vehicle body cover, and the unit is provided below the unit cover. A swing type engine is arranged, and an opening at a lower portion of the vehicle body cover is closed with a rear fender to form a closed space with the vehicle body cover, the driving seat, and the rear fender, and a belt is provided in a belt chamber in the unit swing type engine. A scooter-type vehicle comprising a type automatic transmission and configured to cool the belt-type automatic transmission by introducing outside air into the belt chamber, connect an air guide pipe for introducing outside air into the belt chamber, The outside air suction port of the air guide pipe is arranged in the closed space, and the rear fender is formed with an insertion portion for the air guide pipe. And therefore, foreign matter such as mud and water raised by the rear wheel in the closed space there is no possibility to penetrate.

Further, the air guide pipe is divided into a connecting tube outside the closed space and a cooling duct in the closed space, and these cooling ducts and the connecting tube are connected by the insertion portion, and the cooling duct is connected to the cooling duct. A seal portion is provided at the connecting portion between the tube and the connecting tube to seal the closed space from the outside. Therefore, there is no possibility that foreign matter such as mud or water which winds up the rear wheel may enter the closed space, and the air guide pipe may be damaged. There is no problem of doing so.

[Brief description of the drawings]

FIG. 1 is a left side view of a scooter type vehicle showing an embodiment of a cooling device for an automatic belt transmission of a scooter type vehicle according to the present invention.

FIG. 2 is an enlarged side view of a rear portion of the vehicle body.

FIG. 3 is a cross-sectional plan view of the unit swing type engine along the line III-III in FIG. 2;

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Scooter type vehicle 2 Body frame 10 Operation seat 11 Body cover 14 Unit swing type engine 25 Belt room 26 Belt automatic transmission 34 Rear fender 34a Fender body 34b Extension part 35 Closed space 39 Cooling device 43 Outside air suction port 44 Air guide pipe 45 Connection Tube 46 Cooling duct 47 Insertion part 48 Flange (Seal part)

Claims (2)

[Claims] 1. A rear part of a vehicle body is covered with a vehicle body cover, an operation seat is disposed above the vehicle body cover, and a unit swing type engine is disposed below the vehicle body cover. A closed space is formed by the operation seat and the rear fender, and a belt-type automatic transmission is provided in a belt room in the unit swing type engine, and outside air is introduced into the belt room to cool the belt-type automatic transmission. In the scooter type vehicle configured as described above, an air guide pipe 44 for introducing outside air into the belt chamber 25 is connected, and an outside air suction port 43 of the air guide pipe 44 is arranged in the closed space 35 and A belt automatic transmission for a scooter-type vehicle, wherein an insertion portion 47 of the air guide pipe 44 is formed in a rear fender 34. Cooling system. 2. The air guide pipe 44 is connected to the closed space 35.
The cooling duct 46 and the connecting tube 45 are divided into an outer connecting tube 45 and a cooling duct 46 in the closed space 35, and the cooling duct 46 and the connecting tube 45 are connected by the insertion portion 47. 2. The cooling device for a belt automatic transmission of a scooter-type vehicle according to claim 1, wherein a seal portion is provided at the connecting portion to seal the closed space from the outside.