JP3442640B2 - Cooling mechanism of belt transmission - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling mechanism for a belt transmission such as a motorcycle.

[0002]

2. Description of the Related Art Conventionally, in a belt transmission device for transmitting an engine output of a motorcycle or the like to a rear wheel by a belt and a pulley, in order to prevent the belt from being deteriorated earlier due to frictional heat of the belt and the pulley, for example, Kaisho 60-185
There is known a technique in which a belt is cooled by a cooling fan provided on a pulley like No. 632, and in such a technique, as shown in FIG. In order to cool the belt transmission device 50 in which the V-belt 53 is wound around the driven pulley attached to the illustrated driven shaft, the case 54 covering the outside is provided with the opening 54h, while the drive pulley 52 is provided with the cooling fan 55. The cooling fan 55 introduces outside air into the belt chamber B from the opening 54h to cool the belt transmission device 50.

On the other hand, the cooling structure in which the cooling fan 55 is attached to the drive pulley 52 as described above has a large load on the engine, and the cooling air for cooling the engine contains foreign matters such as dirt and dust, water and the like. In this case, it may be fed into the belt chamber B as it is.
There are also known technologies such as Japanese Patent No. 666 and Japanese Patent Application Laid-Open No. 61-282667.
The belt transmission device 50 is cooled by using a part of the cooling air taken in from the cooling fan 57 for cooling the engine mounted on the opposite side of 1, and the high pressure portion near the cooling fan 57 and the inside of the belt chamber B are cooled. Are communicated with each other through the air passage (for example, the air passage 58 indicated by a broken line in FIG. 2), and a part of the cooling air for cooling the engine is sent into the belt chamber 56 through the air passage to cool the belt transmission device 50.

[0004]

However, the above-mentioned JP-A-61-282666 and JP-A-61-282667 have been proposed.
The method of cooling a part of the cooling air for cooling the engine through the air passage as in the above-mentioned No. requires the design change of the case 54 and the like, and has the problem that the structure becomes complicated.

Therefore, the present invention does not bring about the disadvantage of increasing the engine load such as providing a cooling fan on the pulley,
In addition, try to construct a cooling mechanism for the belt transmission that does not involve major design changes such as the basic number of parts and the shape of parts, and extend the life of the belt etc. by using clean cooling air. With the goal.

[0006]

This order to achieve the above object invention SUMMARY OF], in claim 1, in the cooling mechanism for cooling the belt transmission device and the outside is disposed adjacent to the engine is covered with a cover, wherein Located on the right side of the engine
By the cooling fan, the sucked from the opening provided in the fan cover to correspond to the position of the cooling fan, a cylinder head of the engine, the cooled cooling air being subjected to a cooling of the cylinder, front left of the engine
It is introduced into the cover from the introduction path provided on one side,
After cooling the belt transmission provided on the left rear side of the engine, the belt transmission is discharged to the rear of the belt transmission .

Here, for example, in an air-cooled engine, cooling air taken in by a cooling fan is sent to a cylinder head and a cylinder through a fan cover and a shroud to cool the engine, and the cooling air used for cooling is discharged to the outside. ing.
The temperature of the cooling air after cooling at this time is about 70 to 80 ° C., and this temperature is about 30 to 50 ° C. lower than the temperature in the belt chamber accommodating the belt transmission and the temperature of the pulley and the like. On the other hand, it is said that when the temperature in the belt chamber rises and the temperature of the pulley and the like rises by about 10 ° C., the life of the belt becomes about half. For this reason, if the cooling air that has already been cooled for the engine is introduced into the cover to cool the belt transmission, it is possible to cool using a large amount of cooling air. It is possible to reduce the temperature of 10 ° C and the temperature of the pulley etc. by about 20 to 30 ° C.

As described above, by using the cooling air that has been cooled by the engine, the structure can be simplified without increasing the number of parts and making a large design change of the shape of parts. Even in the case of a water-cooled engine, it is possible to use cooled cooling air that has been used for cooling the radiator.

[0009] In the second aspect, soil,
A foreign matter removing means for removing foreign matter such as dust is provided. Removing foreign matter such as dirt and dust with such foreign matter removing means and cooling with clean cooling air is particularly effective for extending the life of the belt and the like.

Further, in claim 3, as the foreign matter removing means,
By using a trap, an air cleaner, or a combination of a trap and an air cleaner. Here, the trap is, for example, a means for overhanging a baffle plate or the like in the middle of cooling air to remove foreign matter while changing the flow direction,
Effective for removing relatively large foreign substances. Further, the air cleaner is a means for removing relatively fine foreign matter. Further, by using such means, the structure can be easily configured, and a large design change of parts and the like is not caused.

Further, according to a fourth aspect of the present invention, an air brake is provided in the middle of the introduction path.
A drain hole for discharging water etc. was provided on the upstream side of the lina .
By discharging water, collected foreign matters, or the like from the water drain hole, the cooling air can be further cleaned, and the life of the pulley, belt, etc. can be further extended.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION A cooling mechanism for a belt transmission according to the present invention will be described with reference to the accompanying drawings. Here, FIG. 1 is a cross-sectional view showing a configuration example of a cooling mechanism of the belt transmission device according to the present invention.

The cooling mechanism for a belt transmission according to the present invention is configured for cooling a belt transmission used in a motorcycle such as a scooter, and does not significantly change the basic form of existing parts or the like. In addition to efficient cooling, clean cooling air prevents wear of components such as the belt.

As shown in FIG. 1, the belt transmission 1 is a drive pulley which is arranged on the left rear side of the engine 2 in the traveling direction of the vehicle (upward in FIG. 1) and is attached to the left end side of the crankshaft 3. 4, a driven pulley 6 attached to the driven shaft 5, and a V belt 7 wound around the drive pulley 4 and the driven pulley 6, and transmits the rotation of the crankshaft 3 to the driven shaft 5. Is transmitted to the axle 10 via the centrifugal clutch 8 and the gear train 9.

Further, the belt transmission device 1 such as the driving pulley 4, the driven pulley 6 and the V-belt 7 constitutes a continuously variable transmission mechanism. Therefore, the driving pulley 4 has a pair of fixed side and movable side half pulleys. The driven pulley 6 is provided with the bodies 4a and 4b.
Also has a pair of fixed and movable pulley halves 6a, 6b. The governor 11 is integrally provided on the movable pulley half 4b so that the pulley half 4b slides in the axial direction in response to an increase or decrease in the rotation of the crankshaft 3.
The belt cover 12 covers the outside of the belt transmission 1 and forms the belt chamber B inside.

On the other hand, on the right side of the engine 2, the engine 2
Cooling system is provided. That is, the crankshaft 3
A cooling fan 13 is attached to the right side of the cooling fan 13, a fan cover 14 covering the outside thereof is attached to the shroud 15 to form a cooling chamber C inside, and the fan cover 14 corresponding to the position of the cooling fan 13 is attached to the cooling fan 13. ,
An opening 14h is provided. The cooling fan 13 allows the outside air to be introduced from the opening 14h to cool the cylinder and the cylinder head of the engine 2. By the way, in the opening 14h,
A plurality of louvers r are provided to prevent intrusion of dust and water.

By the way, in the present invention, after cooling the engine 2 by the cooling air taken in from the opening 14h, the belt transmission 1 is cooled by using the cooling air provided for this cooling.

For this reason, the introduction cover 16 is attached from the left side surface of the engine 2 to the front surface of the belt cover 12, and a communication port 12h is provided in a part of the front side of the belt cover 12 by the introduction cover 16. The introduction path D is formed so that the cooling air used for cooling the engine 2 can be sent toward the communication port 12h. The communication port 12h is provided in the vicinity of the drive pulley 4 so that the drive pulley 4 is cooled by the cooling air passing through the communication port 12h, and at the rear end side of the belt cover 12, A discharge port 12g that discharges the cooled cooling air to the outside further behind the driven pulley 6.
Is provided.

A trap 17 and an air cleaner 18 are provided in the introduction path D in the introduction cover 16 in the middle thereof to remove foreign matters such as dirt and dust contained in the cooling air. The trap 17 is provided so as to project from the side so as to obstruct the flow path of the cooling air, and by alternately projecting from both sides with the flow path sandwiched, the effect of removing foreign matter is improved. There is. After removing a large amount of foreign matter with this trap 17, the air cleaner 18 on the downstream side is removed.
It is designed to remove fine foreign matters.

A water drain hole 19 is provided in the introduction cover 16 corresponding to the base end of the trap 17 on the predetermined side on the front side of the flow path. Then, the height of the portion of the drainage hole 19 is lowered so that rainwater and the like that have entered together with the cooling air can be discharged from the drainage hole 19.

The operation and the like of the cooling mechanism of the belt transmission configured as described above will be described. The cooling air for cooling the engine 2 is sucked into the cooling chamber C by the cooling fan 13 and is used for cooling the cylinder head and the cylinder of the engine 2. At this time, the soil wound up by running,
Foreign matter such as dust and rainwater are blocked by the louver r of the opening 14h of the fan cover 14 to prevent a part from entering, but the remaining part is sucked together with the cooling air.

Although the cooling air used for cooling the engine 2 has risen to a temperature of about 70 to 80 ° C., it is still 30 when compared to the temperatures of the drive in the belt chamber B and the driven pulleys 4 and 6. ~ 50 ° C lower. Then, this cooling air enters the introduction path D in the introduction cover 16 and flows toward the communication port 12h. During this time, large foreign matter is removed by the trap 17, water and the like are discharged from the drain hole 19, and then fine foreign matter is removed through the air cleaner 18 to form clean cooling air.

The cooling air is sent into the belt chamber B through the communication port 12h, cools the drive pulley 4, and then flows backward while cooling the V-belt 7, cools the driven pulley 6 and discharges it. It is discharged from 12 g to the outside. With the above configuration, a large amount of cooling air can be used for efficient cooling. Moreover, since it is only necessary to add the introduction cover 16 and the like, it is possible to increase the number of parts,
Simple design without major design or shape changes. Furthermore, since clean cooling air is used, it is less likely to wear the belt or the like.

The present invention is not limited to the above embodiment. Those having substantially the same configurations as those described in the claims of the present invention and exhibiting the same operational effects belong to the technical scope of the present invention. For example, the engine can be applied to a water-cooled engine.

[0025]

Cooling mechanism of the belt transmission device according to the present invention as described above, according to the present invention, as claimed in claim 1, an engine cylinder of
Since the cooling air that has already been used for cooling the da head and cylinder is used to cool the belt transmission,
It can be cooled using a large amount of cooling air, and it can be easily configured without increasing the number of parts and making a large design change of parts shapes. When a foreign matter removing means for removing foreign matter such as dirt and dust is provided in the middle of the introduction path as in claim 2, it is possible to cool by using clean cooling air, and the life of the belt or the like is shortened. Effective for prolonging life. On this occasion,
The foreign matter removing means as claimed in claim 3 can be easily configured. Further, as in claim 4 , an air brake is provided in the middle of the introduction path.
If a drain hole for discharging water or the like is provided on the upstream side of the liner, the life of the belt or the like can be further extended.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a configuration example of a cooling mechanism of a belt transmission device according to the present invention.

FIG. 2 is an explanatory view illustrating a cooling mechanism of a conventional belt transmission device.

[Explanation of symbols]

1 ... Belt transmission, 2 ... Engine, 4 ... Drive pulley,
6 ... driven pulley, 7 ... V belt, 12 ... belt cover,
13 ... Cooling fan, 14 ... Fan cover, 16 ...
Introduction cover, 17 ... Trap, 18 ... Air cleaner, 1
9 ... Water drainage hole, B ... Belt chamber, C ... Cooling chamber, D ... Introduction path.

─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-61-146694 (JP, A) JP-A-8-135528 (JP, A) JP-A-3-271090 (JP, A) Actual development Sho-61- 77463 (JP, U) Actually opened 59-195018 (JP, U) Actually opened 61-162528 (JP, U) Actually opened 62-75260 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16H 57/00-57/12 F01P 1/00-1/10 F01P 5/06 F02M 35/08

Claims (4)

(57) [Claims] 1. A cooling mechanism for cooling a belt transmission device which is disposed adjacent to an engine and whose outside is covered with a cover, wherein a position of the cooling fan is provided by a cooling fan disposed on the right side of the engine. The cooling air that has been sucked through the opening provided in the fan cover corresponding to the above and has been used for cooling the cylinder head and the cylinder of the engine is the introduction passage provided in the left front of the engine. Introduced into the cover from the left of the engine
After cooling the belt transmission installed at the rear,
A cooling mechanism for a belt transmission characterized in that it is discharged to the rear of the belt transmission. 2. The belt transmission cooling mechanism according to claim 1, wherein foreign matter removing means for removing foreign matter such as dirt and dust is provided in the middle of the introduction path. Cooling mechanism. 3. The cooling mechanism for a belt transmission according to claim 2, wherein the foreign matter removing means is a trap, an air cleaner, or a combination thereof. 4. The cooling mechanism for a belt transmission according to any one of claims 1 to 3, wherein a drain hole for discharging water or the like is provided upstream of the air cleaner in the middle of the introduction path. A belt transmission cooling mechanism characterized by the above.