JPH08219262A - Cooling device of belt chamber in continuously variable transmission - Google Patents

Abstract

PURPOSE: To provide a belt chamber cooling equipment of a continuously variable transmission capable of providing excellent sound absorbing effect. CONSTITUTION: A belt chamber 1 of a continuously variable transmission is provided with an introducing duct 2 and a discharge duct 3 to introduce the outside air for cooling, the noise absorbing material is provided inside the introducing duct 2, and a noise absorbing box 4 provided with an attachable/ detachable filter 5 is added thereto.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device for a dry V-belt type continuously variable transmission of a vehicle.

[0002]

2. Description of the Related Art Conventionally, in a continuously variable transmission equipped with an input / output pulley consisting of a pair of sheaves which can be brought into and out of contact with each other, and a dry V belt mounted between the pulleys,
When the vehicle is traveling at high speed and under high load, the temperature of the belt chamber may rise due to frictional heat and the life of the V-belt may be shortened. Therefore, the outside air introducing duct and the exhaust duct are connected to the belt chamber. A cooling device was provided. However,
In this cooling device, since the introduction duct is open to the outside air, there is a problem that belt noise is radiated and propagated into the passenger compartment, which gives an occupant a discomfort. Therefore, conventionally, as shown in FIG. 4, a sound absorbing material 52 is attached to the inside of the introduction duct 51 to form the introduction duct 51 in a double structure, and the sound absorbing material 52 is configured to absorb noise. However, such a structure of FIG. 4 has an insufficient sound absorbing effect, and a better sound absorbing measure has been desired.

[0003]

SUMMARY OF THE INVENTION The present invention has been devised in view of the above problems of the prior art, and an object thereof is not to provide a cooling device for a belt chamber of a continuously variable transmission which can obtain a good sound absorbing effect. In the cooling device for the belt chamber in which the outside air introducing duct and the exhaust duct are connected to the belt chamber of the continuously variable transmission, the introduction duct side is equipped with a sound absorbing material and a removable filter. That is to say that the sound absorbing box provided is attached.

[0004]

[Operation] By attaching a sound absorbing box to the introduction duct, the sound absorbing material installed inside the sound absorbing box can absorb the belt noise satisfactorily to improve the sound absorbing effect, and the sound absorbing material is well deteriorated by the filter. To be prevented.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective configuration diagram of an engine including a continuously variable transmission. A continuously variable transmission is provided on a side of an engine E, and a belt whose outer periphery is covered by a cover. The belt chamber 1 is provided with an input / output pulley that constitutes a continuously variable transmission and a dry V-belt that is hung between the pulleys. In order to reduce the temperature rise of the V-belt and extend the life of the V-belt, the belt chamber 1 is provided with an introduction duct 2 for introducing the outside air and an exhaust duct 3 for discharging the outside air to cool the inside of the belt chamber 1. The introduction duct 2 and the discharge duct 3 are formed of a flexible bellows-shaped resin pipe. In this example, the sound absorbing box 4 is attached to the suction side at the upstream end of the introduction duct 2.
A filter 5 is detachably attached to an outside air suction port 4a opened in the sound absorbing box 4.

FIG. 2A is an enlarged perspective view showing a state in which a part of the sound absorbing box 4 is broken away to show the inside and the filter 5 is removed, and FIG. 2B is a sectional configuration view. is there. A sound absorbing material S made of a porous sound absorbing resin material such as urethane foam is installed in the sound absorbing box 4, and a fitting frame body having an insertion opening 6a formed on the upper surface of the suction opening 4a. 6 is attached, and the filter 5 can be removably attached to the fitting frame body 6 from the side of the insertion opening 6a so as to be removable. The filter 5 is a frame plate on the outer peripheral side. A mesh body 5a forming a filter is arranged in 5b, and a locking portion 5c is formed by bending 90 degrees at the upper end of the frame body 5b. When this filter 5 is inserted into the fitting frame body 6 from the insertion opening 6a side, the mesh body 5a is arranged on the surface of the suction port 4a, and the locking portion 5c is locked in the insertion opening 6a. . The filter 5 can be removed from the fitting frame body 6 by lifting the locking portion 5c by hand and periodically replaced with a new one. The filter 5 removes foreign matter such as insects and dust,
The sound absorbing material S inside is prevented from deterioration.

FIG. 3 is a diagram in which the sound absorbing effect in the case where such a sound absorbing box 4 is provided is experimentally obtained, and shows a comparison with a conventional structure in which the sound absorbing box 4 is not provided. In FIG. 4, the line indicated by a is the result of the present invention in which the sound absorbing box 4 is provided, and b is the result of the conventional case having no sound absorbing box. Particularly, in the frequency range indicated by P in the figure which is most frequently used, the present invention has an excellent noise reduction effect as compared with the conventional one, and the belt noise and the like generated in the belt chamber 1 are satisfactorily described above. Sound can be absorbed by the sound absorbing box 4, and an occupant is less likely to feel uncomfortable.

[0008]

According to the present invention, in a belt chamber cooling device in which an outside air introducing duct and an outside air duct are connected to a belt chamber of a continuously variable transmission, a sound absorbing material is internally mounted on and detachable from the introducing duct side. By installing a sound absorbing box equipped with a simple filter, the sound absorbing material inside the sound absorbing box can absorb belt noise and the like and exhibit an excellent sound absorbing effect. Is prevented from being deteriorated and the life of the sound absorbing material is improved.

[Brief description of drawings]

FIG. 1 is a perspective configuration diagram of an engine including a continuously variable transmission.

2A is a partially cutaway exploded perspective view of the sound absorbing box, and FIG. 2B is a cross-sectional configuration diagram of the sound absorbing box.

FIG. 3 is a diagram showing a sound absorbing effect of a sound absorbing box.

FIG. 4 is a cross-sectional configuration diagram showing a conventional sound absorbing structure of a duct.

[Explanation of symbols]

 1 Belt Chamber 2 Introduction Duct 3 Discharge Duct 4 Sound Absorption Box 4a Suction Port 5 Filter 5a Net Body 6 Fitting Frame Body S Sound Absorbing Material

Claims (1)

[Claims] 1. A cooling device for a belt chamber, in which an outside air introduction duct and an exhaust duct are connected to a belt chamber of a continuously variable transmission, wherein the introduction duct side is provided with a removable filter that internally houses a sound absorbing material. A belt chamber cooling device in a continuously variable transmission, further comprising a sound absorbing box.