JPS61274170A - Cooling apparatus for v-belt type automatic transmission - Google Patents

Abstract

PURPOSE:To improve the durability of a V-belt by installing a cooling fan onto a driving-side V-pulley having a variable diameter and forming an outside- air introducing hole onto the upper surface of a trailing-side V-pulley having a variable diameter of a transmission chamber cover and forming an air discharge hole in the vicinity of the fan. CONSTITUTION:A cooling fan 12 is installed onto a driving side V-pulley 9 having a variable diameter, and an outside-air introducing hole 24 is formed onto the upper surface of a trailing-side V-pulley 9 having a variable diameter of a transmission chamber cover 22, and an air discharge hole 27 is formed in the vicinity of the cooling fan 22 of the transmission chamber cover 22. Therefore, the part applied with the largest load can be cooled concentrically, and the durability of the V-belt 10 can be improved, and a large transmission power can be obtained with a relatively small-sized apparatus.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cooling device for a V-belt type automatic transmission used in a motorcycle or the like by introducing outside air.

[Conventional technology]

A V-belt type automatic transmission consists of a V-belt stretched between a pulley on the driving side and a pulley on the driven side. The rotation of the driving side is transmitted to the driven side by frictionally engaging the head slope, and V
By changing the interval between the V-shaped annular grooves on the pulleys, the effective winding diameter of the V-belt on each V-pulley can be changed to achieve stepless speed change, which enables smooth speed changes with a simple structure, making it ideal for motorcycles. It is used as a transmission.

In this case, in order to prevent dirt, dust, muddy water, etc. from entering the automatic transmission, the automatic transmission is housed in a sealed transmission compartment, but the power transmission is FJIII heat is generated due to the frictional engagement of
As shown in the publication, cooling fans are installed on the driving side V-pulley and the driven side V-pulley, respectively, and outside air is introduced into the transmission compartment through the outside air inlet and the outside air exhaust 1'' of the vehicle body. The V Some belt-type automatic transmissions are cooled and the heated outside air is discharged from the rear of the transmission compartment.

[Problem that the invention seeks to solve 1)] However, in this structure, a fan is provided on each of the V-pulleys on the driving side and the driven side, which increases the size of the device, and the air passage is long. However, there was a problem in that the selection of the outside air introduced was restricted due to the resistance of the passage.

Therefore, an object of the present invention is to reduce the size of the device and increase the amount of outside air introduced, thereby improving the cooling efficiency.

[Means for solving problems]

In order to achieve the above object, the present invention provides a driving side variable diameter V pulley provided on a drive shaft, a driven side variable diameter V pulley provided on a driven shaft, and a V bell l stretched between both pulleys. −
A V-belt automatic transmission system that cools the V-belt automatic transmission by storing outside air in the transmission room through the outside air inlet and exhausting it through the outside air outlet. In the transmission cooling device, a cooling fan is provided on the drive side variable diameter V-pulley, an outside air inlet is provided on the upper surface of the driven side variable diameter V pulley in the transmission room, and an outside air outlet is provided near the nozzle 7. It is characterized by the formation of each.

[For production]

As a result, outside air is introduced from the rear of the transmission room to cool the V-belt type automatic transmission and is discharged from the vicinity of the fan provided on the variable diameter V-pulley on the drive side.

〔Example〕

An embodiment in which the present invention is applied to a motorcycle will be described based on the drawings.

A V-belt type automatic transmission 3 is arranged between the engine 1 and the driving rear wheels 2.

■The belt type automatic transmission 1ls3 has a drive side variable diameter V provided on the drive shaft 5 connected to the crank shutt 4 of the engine 1.
A pulley 6 and a final reduction gear 7 for the driving rear wheel 2. It is comprised of a driven side variable diameter pulley 9 connected via a centrifugal clutch 8 and a belt 10 stretched between both pulleys 6 and 9, and is housed in a transmission chamber 11 with a sealed structure.

Kakeru! The variable diameter V-pulley 6 on the ll side includes a cooling fan 12 fixed to the outer end of the drive shaft 5, a fixed pulley half 13 fixed to the drive shaft 5, and is arranged to be movable in the axial direction of the drive shaft 5. The fixed pulley half 13 and the movable pulley half 14 face each other to form a V-shaped annular groove 15.

The driven side variable diameter V pulley 9 includes a fixed pulley half 18 fixed to a fixed pulley shaft 17 rotatable to the driven shaft 16, and a movable pulley half 1 movable in the axial direction of the fixed pulley shaft 17.
9, the fixed pulley half 18 and the movable pulley half 19 face each other to form a V-shaped annular groove 20, and the V-shaped annular groove 20 and the drive side variable diameter A V-belt 10 is inserted and stretched between the annular groove 15 and the rotation of the engine 1 is transmitted to the driving rear wheel 2.

The transmission chamber 11 that houses this V-belt type automatic transmission 3 is formed by a part of the crankcase 21, a transmission chamber cover 22, and a part of the transmission case 23. An outside air introduction hole 24 is formed on the upper surface of the V-diameter pulley 9, a short U-shaped introduction pipe 25 is connected to the outside air introduction hole 24, and a tip opening 25a of the introduction pipe 25 is connected.
is dust.

It faces downward to prevent muddy water from entering, and is further equipped with a filter 26.

Further, on the outer periphery of the cooling fan 12 provided on the drive shaft 5 of the transmission room cover 22, near the drive side variable diameter V pulley 9, an outside air exhaust hole 27 has an outside air exhaust passage 28 opened downward.
is connected.

The V-belt automatic transmission 3 configured in this manner uses the centrifugal force generated by the rotation of the drive shaft 5 to cause the drive-side variable diameter V-pulley 6 to
By moving the movable pulley half 14 closer to and away from the fixed pulley half 13, the driving side variable diameter ■ The interval between the V-shaped annular grooves 15 of the pulley 6 is varied, and accordingly the driven side variable diameter Continuously variable speed is achieved by varying the interval between the grooves 20 and changing the effective winding diameter of the V-belt 10 around both pulleys 6.9.

Then, when the cooling fan 12 that rotates together with the drive shaft 5 exhausts the air in the transmission chamber 11 to the outside through the outside air outlet 27, the inside of the transmission chamber 11 becomes negative pressure, and relatively low-temperature outside air is released. It is introduced into the transmission chamber 11 from the outside air inlet 24 through the filter 26° introduction pipe 25, and flows from the driven side variable diameter V pulley 9 to the drive side variable diameter pulley 6 direction as shown by the arrow in the figure. Side variable diameter ■Pulley 9. V
Belt 10. Driving Side Variable Diameter (2) The pulley 6 is cooled and the fan 12 discharges the air from the inner periphery of the fan 12 toward the outer periphery from the outside air outlet 27 through the outside air exhaust passage 28 .

As a result, the introduced outside air intensively cools the upper half of the driven side variable diameter V-pulley 9, which is the belt tensioning side that carries the most load, the V-belt 10, and the drive side variable diameter pulley 6. 12 is provided on the side of the drive side variable diameter pulley 6, so the drive side variable diameter V pulley 6, which receives conduction heat from the engine 1, can be particularly cooled, and the V belt 10
The durability of the V-belt 10 can be improved by preventing heating of the V-belt 10.

〔Effect of the invention〕

As described above, the present invention includes a drive side variable diameter V pulley provided on the drive shaft, a driven side variable diameter pulley provided on the driven shaft, and a V belt stretched between both pulleys. ■A V-belt automatic transmission in which the belt-type automatic transmission is housed in the transmission chamber, and the outside air introduced from the outside air inlet to the 11th gear is discharged from the outside air outlet to cool the V-belt automatic transmission. In the cooling device, a cooling fan is provided on the drive side variable diameter V pulley, an outside air inlet is formed on the upper surface of the driven side variable diameter V pulley of the speed change i, and an outside air outlet 1 is formed near the fan. Therefore, the durability of the V-bell 1- is improved by intensively cooling the parts that bear the most load, and it becomes possible to transmit a large amount of power with a relatively small device. In addition, since the 4Ilt construction is simple, the ease of manufacturing and assembling is improved.

[Brief explanation of drawings]

The figures show an embodiment in which the present invention is applied to a motorcycle. Fig. 1 is a sectional plan view of a V-belt type automatic transmission,
The figure is a partially sectional front view. 1... Engine 2... Drive rear wheel 3...
・V-belt type automatic transmission 4... Crankshaft 5... Drive shaft 6... Drive side variable diameter V pulley 9... Drive side variable diameter ■Pulley 10... V belt 11... Speed change Aircraft compartment 12...Cooling fan 1
6... Driven shaft 22... Transmission chamber cover 24.
...Air introduction hole 27...Air discharge hole Applicant: Honda Motor Co., Ltd. Commissioner of the Patent Office Black 1)
Aki Yu Tono 16 Display of Case 1985 Patent Application No. 115131 2, Name of Invention ■ Cooling Device for Belt Type Automatic Transmission 3, Relationship with the Amendment Person Case Patent Applicant (532) Honda Motor Co., Ltd. 4. Agent Kajicho, Chiyoda-ku, Tokyo - ] No. 9, No. 16, 5. Date of amendment order Voluntary submission 6. Number of inventions increased by amendment Figure 2 of the drawings is corrected as shown in the attached sheet. that's all

Claims (1)

[Claims] 1. A V-belt type automatic transmission equipped with a variable diameter pulley on the drive side provided on the drive shaft, a variable diameter V pulley on the driven side provided on the driven shaft, and a V belt stretched between both pulleys. A cooling device for a V-belt type automatic transmission that cools the V-belt type automatic transmission by storing outside air introduced into the transmission room from an outside air inlet into the transmission room from an outside air outlet and exhausting the outside air from an outside air outlet. A V-belt characterized in that a cooling fan is provided on the side variable diameter V-pulley, and an outside air inlet is formed on the upper surface of the driven side variable diameter V-pulley in the transmission chamber, and an outside air outlet is formed near the fan. Cooling system for automatic transmission.