JPH09329217A - Cooling structure for dry type continuously variable transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the cooling structure for a continuously variable transmission to powerfully suck outside air and improve the cooling efficiency of the interior of a belt chamber. SOLUTION: A dry type continuously variable transmission 2 having a belt 7 run around and between pulleys 4 and 6 on the input side and the output side is incorporated in a belt chamber S formed in a case body 1. A fan 10 for cooling the belt chamber S is arranged at the outer periphery of the pulley shaft 5 of the pulley 6 on the output side. A plurality of communication ports 1d through which outside air is sucked in the central part of the fan 10 are formed through the outer periphery of a boss part 1b on the output side to support the pulley 6 on the output side of the case body 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling structure for a dry continuously variable transmission.

[0002]

2. Description of the Related Art Conventional dry continuously variable transmissions have
It is configured to introduce outside air into the inside and cool it by the outside air, and the fan is rotated inside to cool it, but in the past, by rotating the fan, the outside air is efficiently sucked and cooled. There was a problem that it was difficult.

[0003]

SUMMARY OF THE INVENTION In view of the above problems of the prior art, it is an object of the present invention to not provide a cooling structure for a dry type continuously variable transmission capable of efficiently introducing and cooling the outside air.
The main point of this is that a continuously variable transmission in which a belt is hung between the input side pulley and the output side pulley is installed inside the belt chamber formed inside the case body, and the belt chamber is provided on the outer circumference of the pulley shaft of the output side pulley. In a dry continuously variable transmission provided with a cooling fan, a plurality of communication passages for sucking outside air into the central portion of the fan are provided on the outer periphery of a boss portion that supports the output side pulley shaft of the case body. That is, the mouth is formed through. The second gist is that a sound absorbing material is attached to the outside of the case body around the plurality of communication ports.

[0004]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional configuration diagram of a dry type continuously variable transmission. A belt chamber S having a dry type continuously variable transmission 2 built therein is formed inside a case body 1, and the dry type continuously variable transmission 2 is ,
A pair of input-side pulleys 4 that can be separated from and connected to the input-side pulley shaft 3 to which driving force is transmitted from the engine side via an electromagnetic powder clutch are provided, and on the other hand, an output-side pulley 4 that is parallel to the input-side pulley shaft 3 A shaft 5 is provided, and an output side pulley 6 including a pair of pulleys that can be brought into and out of contact with the output side pulley shaft 5 is provided. A belt 7 is provided between the input side pulley 4 and the output side pulley 6. It is mounted so that the rotational force can be continuously changed.

The case main body 1 is provided with a bearing 8 for supporting the input side pulley shaft 3 and the input side boss portion 1
a is formed and the output side pulley shaft 5 is formed.
An output side boss portion 1b having a bearing 9 for supporting the concave portion 1b is formed on the outside of the output side boss portion 1b of the case body 1 in this example, as shown in the perspective view of FIG.
c is formed, and the outer periphery of the recess 1c is a flange portion 1e protruding outward. The outer peripheral side of the bearing 9 of the output side boss portion 1b in the recess 1c has a plurality of communication ports 1d, 1d, 1d are formed so as to surround the bearing 9 respectively, and arc-shaped arc standing walls 1f, 1f are erected on the outside of the communication port 1d, and between the arc standing wall 1f and the inner periphery of the flange portion 1e. Has a gap M formed therein, and a sound absorbing material can be fitted into the gap M.
A sound absorbing material is arranged on the outer peripheral side of the communication ports 1d, 1d, 1d to absorb sound.

A cover body 11 is provided on the outside of the recess 1c of the case body 1, and the cover body 11 has a structure as shown in the perspective view of FIG. 4 and the sectional view of FIG. And a flange portion 11a formed in a shape matching with the flange portion 1e of the case body 1 is formed to project outward, and the flange portion 11a has bolt holes at predetermined intervals. 11e, 11e are formed so as to penetrate, and a large-diameter concave portion 11b and an introduction concave portion 11c are formed in a communicating manner inside the flange portion 11a so as to communicate with each other. Has a large diameter so as to cover the outside of the communication port 1d of the case body 1, and the introduction recess 11c is formed in a groove shape having a smaller diameter than this. An intake cylinder 11d is integrally formed on the upstream end side of the introduction recess 11c so as to project outward, and an intake port 12 for introducing outside air is opened at the tip of the intake cylinder 11d.

Further, as shown in the sectional view of FIG. 5, a sound absorbing material 13 is attached from the bottom surfaces of the large-diameter recess 11b and the introduction recess 11c to the entire inner peripheral surface of the flange 11a. The material 13 is made of, for example, a nonwoven fabric having a large sound absorbing effect, urethane foam, or the like. Further, the cover body 11 is formed in a half-divided cross section as shown in FIG. 5, and the opening side on the right side of the figure, that is, the flange portion 11a.
A filter 14 is stretched over the entire surface on the side, and the filter 14 includes the large-diameter recess 11b and the introduction recess 1
It is stretched so as to cover the entire surface of 1c. The packing 15 may be attached to the outer surface of the flange portion 11a in advance.

The cover body 11 having the above-mentioned structure is attached to the flange 1e of the case body 1 shown in FIG.
It is possible to attach the cover body 11 to the outside of the concave portion 1c of the case body 1 in a cover-like manner by aligning and attaching a and inserting the bolts into the bolt holes 11e, 11e, 11e of the flange portion 11a from the outside. At the same time, airtightness between the two is ensured via the packing 15. In this manner, when the cover body 11 is covered on the outside of the recess 1c of the case body 1, the intake passage R having a considerably wide space is formed between the recess 1c and the large-diameter recess 11a and the introduction recess 11c of the cover body 11. The intake passage R has its upstream end communicated with the outside air via the intake port 12, and its downstream end communicated with the communication ports 1d, 1d, 1
The interior of the belt chamber S is communicated via d.

In this way, the cover body 11 can be provided on the outside of the case main body 1 to form the intake passage R having a large volume between the two, and the inner peripheral surface of the intake passage R is as described above. Since the sound absorbing material 13 is provided, the sound absorbing material 13 emits the intake sound generated when the outside air is sucked in through the intake opening 12, the discharge sound from the communication opening 1d, and the radiated sound from the cover body 11. It is possible to exhibit good sound absorbing effect by being absorbed by. Further, as described above, since the sound absorbing material is also fitted to the outer periphery of the communication port 1d, this sound absorbing material also achieves the sound deadening effect.

As shown in FIG. 1, a fan is fixedly installed on the outer peripheral side of the bearing 9 of the output side pulley shaft 5, and the fan 10 rotates when the output side pulley shaft 5 rotates. The rotation of the fan 10 allows the outside air to be sucked in through the intake passage R, and the communication port 1d is provided in the fan 1
It has been established on the center side of 0. That is, the plurality of communication ports 1d, 1d, 1d are formed on the outer peripheral side of the bearing 9 and on the inner peripheral side of the fan 10, and the communication ports 1d, 1d are formed by rotating the fan 10.
The outside air is sucked from d, 1d toward the center of the fan 10, and the sucked outside air is strongly blown out from the center of the fan 10 toward the inside of the belt chamber S by the rotation of the fan 10. The outside air can be circulated and the inside of the belt chamber S can be satisfactorily cooled by the outside air, and the cooling effect can be improved.

In FIG. 2, the cover body 11 is attached to the case body 1.
FIG. 3 is an external perspective view showing a state in which it is attached to the intake port 12
A bellows-shaped intake duct 16 can be connected to the.
When the outside air is sucked into the intake passage R from the intake port 12, the sucked outside air is the intake cylinder portion 11d of the cover body 11.
Flow through the introduction recess 11c to the large-diameter recess 11b side, and through the filter 14 the recess 1c of the case body 1
Since it flows to the side, it is possible to satisfactorily remove dust, sand, and the like through the filter 14 and prevent the dust from entering the belt chamber S. Also, filter 1
Since 4 is stretched over the entire opening side of the half-divided cover body 11, the flowing outside air flows from the entire area of the filter 14 to the concave portion 1c side of the case body 1, so that the outside air is spread over a very wide range. No. 1 flows toward the concave portion 1c, the intake resistance is small, and the intake efficiency is improved as compared with the conventional case.

An exhaust duct 17 is connected to the case body 1 in order to discharge the outside air in the belt chamber S to the outside. The exhaust duct 17 has a cylindrical shape as shown in the perspective view of FIG. Is made of resin, and the sound absorbing material 18 is also attached to the inner peripheral surface of the exhaust duct 17,
The sound absorbing material 18 can effectively reduce exhaust noise. In addition, a mesh 19 is stretched on the outlet side at the downstream end of the exhaust duct 17, and this mesh 19 effectively prevents dust, sand, and the like from entering the exhaust duct 17 from the outside. At the same time, the mesh 19 prevents the sound absorbing material 18 in the exhaust duct 17 from popping out, and the mesh 19 prevents the sound absorbing material 18 from popping out. A mounting portion 17a having a bolt hole 17b for mounting to the case body 1 is integrally formed at the upstream end of the exhaust duct 17, and if the mesh 20 is also provided on the mounting portion 17a side, the sound absorbing material 18 To prevent it from entering the case body 1,
In addition, it is possible to better prevent the invasion of dust and the like.

[0013]

According to the present invention, a continuously variable transmission in which a belt is hung between an input side pulley and an output side pulley is installed in a belt chamber formed in a case body, and a pulley shaft of the output side pulley is installed. In a dry continuously variable transmission in which a fan for cooling a belt chamber is provided on the outer periphery of, in the outer periphery of a boss portion that supports the output side pulley shaft of the case body,
Since a plurality of communication openings for sucking outside air are formed through the center of the fan, when the fan in the belt chamber is rotated, the outside air is sucked into the center of the fan from the communication opening. Can be efficiently circulated in the centrifugal direction by the rotational force of the fan to cool the belt chamber satisfactorily, and the suction force of the outside air becomes strong, so that the cooling efficiency is improved. Further, since a sound absorbing material is attached around the plurality of communication ports on the outside of the case body, an intake sound of outside air sucked into the communication body through the communication port and a discharge sound from the communication port, and a cover body. There is an effect that the sound radiated from can be effectively silenced by the sound absorbing material.

[Brief description of drawings]

FIG. 1 is a cross-sectional configuration diagram of a dry-type continuously variable transmission installed inside a case body.

FIG. 2 is an external perspective view showing a state where a cover body is attached to the outer periphery of the case body.

FIG. 3 is a perspective configuration diagram of a case body before the cover body is attached.

FIG. 4 is a perspective configuration diagram showing the inside of a cover body.

FIG. 5 is a cross-sectional configuration diagram of a cover body.

FIG. 6 is a perspective configuration diagram of an exhaust duct.

[Explanation of symbols]

 1 Case body 1a Input side boss section 1b Output side boss section 1c Recessed section 1d Communication port 1e Flange section 1f Arc standing wall 2 Dry type continuously variable transmission 3 Input side pulley shaft 4 Input side pulley 5 Output side pulley shaft 6 Output side pulley 7 Belt 8, 9 Bearing 10 Fan 11 Cover body 11a Flange portion 11b Large diameter recessed portion 11c Introduction recessed portion 11d Intake cylinder portion 12 Intake port 13 Sound absorbing material 14 Filter 15 Packing 17 Exhaust duct 18 Sound absorbing material 19, 20 Mesh S Belt chamber R Intake passage

Claims (2)

[Claims] 1. A continuously variable transmission in which a belt is hung between an input side pulley and an output side pulley is provided inside a belt chamber formed in a case body, and a belt is provided around an outer circumference of a pulley shaft of the output side pulley. In a dry continuously variable transmission including a room cooling fan, a plurality of bosses for sucking outside air into the center of the fan are provided on the outer periphery of a boss portion that supports the output side pulley shaft of the case body. A cooling structure for a dry continuously variable transmission, characterized in that a communication port is formed through. 2. The cooling structure for a dry continuously variable transmission according to claim 1, wherein a sound absorbing material is attached to the outside of the case body around the plurality of communication ports.