JPH07248054A - Cooling device of continously variable transmission - Google Patents

Abstract

PURPOSE:To remarkably reduce the transmission of a noise of belt generated from a cooling device into a vehicle chamber. CONSTITUTION:In a continuously variable transmission having input and output pulleys consisting of a pair of connectable and disconnectable sieves, and a V-belt laid between both the pulleys, a soft synthetic resin foam 7 having sound absorbing property is foamed and molded in a belt chamber for covering the circumference of the V-belt laid between both the pulleys and a passage 3 for introducing and discharging the outside air to and from the belt chamber to form a complex layer body.

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 in a vehicle engine.

[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 that can be brought into and out of contact with each other, and a dry V belt hung between the pulleys, the vehicle is under high load and at high speed. Since frictional heat is generated during traveling and the life of the V-belt is shortened, a belt chamber covering the pulley and the V-belt is provided for the purpose of cooling, and an introduction duct and an exhaust duct for introducing outside air into the belt chamber are provided. There was a cooling mechanism.

[0003]

However, in this transmission, a belt noise is generated by mounting the V-belt on the input / output pulley, so that belt noise is generated and the noise is transmitted from the introduction duct and the discharge duct into the vehicle interior. There was a problem that it made a muffled sound and made passengers feel uncomfortable.

The present invention has been made to solve the above-mentioned conventional problems, and it is possible to significantly reduce the transmission of the belt noise generated in the cooling device into the passenger compartment and improve the comfortability of the continuously variable transmission. It is an object of the present invention to provide a cooling device of the above.

[0005]

SUMMARY OF THE INVENTION In order to solve the above technical problems, the present invention is provided with an input / output pulley composed of a pair of sheaves which are separable from each other, and a V belt which is hung between the pulleys. In the gear transmission, the input / output pulley,
A belt chamber that covers the periphery of the V-belt that is hung between the two pulleys, and a soft synthetic resin foam having a sound absorbing property are foam-molded in the passage for introducing and discharging the outside air to and from the belt chamber. It is a cooling device for a continuously variable transmission formed in a layered body.

[0006]

With the above structure, belt noise can be absorbed and the muffled noise in the vehicle can be significantly reduced.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a side portion of an engine, in which an input / output pulley and a dry belt of a continuously variable transmission The periphery of (not shown) is covered by the belt chamber 1. An opening 2a is formed in the front part of the belt chamber 1, and a flexible introducing duct 3 made of, for example, a synthetic resin and having an air filter (not shown) built therein is connected to the opening 2a. An opening 2b is formed at the rear part of the belt chamber 1 and a discharge duct 4 similar to the introduction duct 3 is connected.

As shown in FIG. 2, for example, the introducing duct 3 has a bellows portion 5 and mounting ports 6 formed at both ends thereof. On the inner peripheral surface of the bellows portion 5 of the introduction duct 3 thus formed, a soft synthetic resin foam 7 having a sound absorbing property is foam-molded following the inner peripheral surface. The foam 7 is soft and sponge-like porous, and is integrally foam-molded when the introduction duct 3 is molded.
It is formed into a multi-layered structure. The introduction duct 3 formed in this way is connected to the opening 2 of the belt chamber 1 through the attachment port 6.
a and the outside air introduction side. The discharge duct 4 is also formed in the same manner and is attached to the rear opening 2b and the discharge port.

As described above, in the belt chamber 1, the introduction duct 3 and the discharge duct 4 made of a synthetic resin material are foam-molded on the inner side surface of the soft synthetic resin foam 7 having a sound absorbing property to form a multilayer body. Installed. Therefore, since the soft synthetic resin foam body 7 formed in layers on the inner peripheral surfaces of the bellows portion 5 of the introduction duct 3 and the discharge duct 4 is a sponge-like porous foam body 7, expansion and contraction, bending, etc. It can follow the deformation, and it does not hinder its installation,
Further, since it is formed as a multi-layered body, its durability is enhanced and handling is easy, and since the foam 7 has sound absorbing properties, belt noise is absorbed and intrusion into the vehicle is significantly reduced, and living You can improve your sex.

[0010]

As described above, according to the present invention, the soft synthetic resin foam molded in layers on the inner peripheral surfaces of the bellows of the introduction duct and the discharge duct is a sponge-like porous foam. Therefore, it is possible to follow deformation such as expansion and contraction, bending, etc. without hindering its attachment, and since it is formed in a multi-layer body, durability is improved and handling is easy, Further, since the foam has a sound absorbing property, the belt noise is absorbed, the intrusion into the vehicle is significantly reduced, and the comfortability can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view of a cooling device for a continuously variable transmission mounted on a side portion of an engine.

FIG. 2 is a cross-sectional view of an introduction duct or an exhaust duct.

[Explanation of symbols]

 1 belt chamber 3 introduction duct 4 discharge duct 7 synthetic resin foam

Claims (1)

[Claims] 1. A continuously variable transmission comprising an input / output pulley composed of a pair of separable sheaves, and a V-belt mounted between the pulleys, wherein the input / output pulley and the pulleys are connected to each other. A belt chamber that covers the surroundings of the V-belt to be hung, and a soft synthetic resin foam having a sound absorbing property are foam-molded into a multi-layer body in a passage for introducing and discharging outside air to and from the belt chamber. Gearbox cooling device.