JPH09329218A - Dry type continuously variable transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a continuously variable transmission with an exhaust duct to excellently reduce the generation of exhaust noise and prevent entrance of dust. SOLUTION: A continuously variable transmission is constituted such that a continuously variable transmission incorporated in a belt chamber is cooled by outside air, which is discharged through an exhaust duct 17. In this case, a sound absorbing material 18 is incorporated in the exhaust duct 17 and a mesh 19 to prevent jump-out of the sound absorbing material 18 and entrance of stones and dust from the outside is attached on the outlet side of the exhaust duct 17.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Conventional dry continuously variable transmissions have
The outside air is introduced into the inside, cooled by this outside air, and the outside air is discharged through the exhaust duct.
There is a problem that dust, sand, and the like may invade from the outside through the exhaust duct, and that exhaust noise may be generated in the conventional exhaust duct.

[0003]

In view of the above problems of the prior art, the present invention is a dry type continuously variable transmission equipped with an exhaust duct capable of reducing exhaust noise and satisfactorily preventing intrusion of dust and the like from the outside. The purpose of the present invention is to provide a dry type system in which the continuously variable transmission installed in the belt chamber is cooled by the outside air introduced into the belt chamber and the outside air is discharged through the exhaust duct. In the continuously variable transmission,
A sound absorbing material is provided inside the exhaust duct, and a mesh for preventing the sound absorbing material from popping out and preventing intrusion of stones, dusts, and the like from the outside is attached to at least the outlet side of the exhaust duct.

[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 that supports the output side boss portion 1b is formed, and as shown in the perspective view of FIG.
c is formed, and the outer periphery of the recess 1c is a flange portion 1e projecting outward, and a plurality of communication ports 1d, 1d, 1d, 1d, 1d are formed so as to surround the bearing 9, respectively, and arc-shaped arc standing walls 1f, 1f are provided outside 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 has a cross section formed in a half shape as shown in FIG.
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.

As described above, the cover body 11 can be provided on the outside of the case 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 outward from the center of the fan 10 by the rotation of the fan 10 and is strong in the belt chamber S. 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 the 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]

Industrial Applicability The present invention is a dry type continuously variable transmission configured such that a continuously variable transmission installed in a belt chamber is cooled by the outside air introduced into the belt chamber and the outside air is discharged through an exhaust duct. In the machine, a sound absorbing material is internally provided in the exhaust duct, and a mesh for preventing the sound absorbing material from jumping out and preventing stones, dust, and the like from entering from the outside is attached to at least the outlet side of the exhaust duct. As a result, the exhaust sound can be effectively silenced through the sound absorbing material in the exhaust duct, and the mesh prevents the sound absorbing material from protruding to the outside, so that the sound absorbing material can be held well and the mesh It is possible to prevent dust, sand, and the like from entering from the outside through the, and to have an effect that a good continuously variable transmission with less exhaust noise can be configured.

[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 (1)

[Claims] 1. A dry-type continuously variable transmission configured to cool a continuously variable transmission installed in a belt chamber by outside air introduced into the belt chamber and to discharge the outside air through an exhaust duct. A sound absorbing material is provided inside the exhaust duct, and a mesh for preventing the sound absorbing material from popping out and preventing stones, dust, and the like from entering from the outside is attached to at least the outlet side of the exhaust duct. Dry continuously variable transmission.