JPH0741959Y2 - Pulley structure of continuously variable transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a pulley structure of a V-belt type continuously variable transmission for an internal combustion engine (hereinafter referred to as an engine).

(Prior Art) Generally, in a V-belt type continuously variable transmission, a fixed sheave is fixed to an input shaft rotated by an engine, and a movable sheave having a conical surface facing the conical surface of the fixed sheave is in the axial direction of the input shaft. The pair of sheaves constitute a drive pulley. A moving means is provided outside the movable sheave to move the movable sheave along the input shaft, and the movement of the movable sheave changes the pulley pitch diameter of the V-belt groove between the movable sheave and the fixed sheave.

On the other hand, a pair of fixed sheave and movable sheave that form a driven pulley are arranged on the output shaft arranged in parallel with the input shaft. That is, the fixed sheave is fixed to the output shaft,
A movable sheave having a conical surface facing the conical surface of the fixed sheave is provided so as to be slidable in the axial direction of the output shaft.

The V-belt is wound between the driving pulley and the driven pulley, and the pulley pitch diameter of the V-belt groove is changed to continuously change the driving force transmitted from the driving pulley to the driven pulley.

In such a V-belt type continuously variable transmission, sound is generated when the V-belt and the pulley slightly slip and rub against each other. Further, in the case where the V-belt has a structure in which a chain or a block having a knot is connected, a sound is generated when the block or the like collides with the sheave of the pulley. On the other hand, the pulley is generally made of a metal material, and the unique frequency of the pulley and the sound generated between the V-belt and the pulley resonate with each other. As a result, the generated sound is amplified and enters the vehicle interior as noise. There was a problem of doing.

(Problems to be Solved by the Invention) In order to solve the above problems, an object of the present invention is to provide a pulley structure capable of preventing resonance with noise generated between a V belt and a pulley of a continuously variable transmission. To do.

(Means for Solving the Problems) The above-mentioned object is to provide a radial antivibration plate for preventing resonance of the fixed sheave on the back surface of the fixed sheave integrated with the shaft portion that constitutes the pulley of the continuously variable transmission. Achieved by the pulley structure of the continuously variable transmission, which is brought into contact with the vibration isolating plate and is held in a pressed state by the fixed sheave by tightening a nut on a screw portion formed on the shaft portion. To be done.

(Operation) In the pulley structure of the continuously variable transmission according to the present invention,
The natural frequency of the fixed sheave is changed by the anti-vibration plate which is in contact with the back surface of the fixed sheave of the pulley and is kept pressed, and resonance with noise generated between the V-belt and the pulley can be prevented.

(Embodiment) The present invention will be described in more detail with reference to the drawings showing an embodiment. FIG. 1 is a semi-cut sectional view showing an essential part of the pulley structure of the present invention. The fixed sheave 1 is formed integrally with a shaft portion, and a vibration damping plate 2 made of a spring material is attached to the shaft portion. As shown in the perspective view of FIG. 2, the anti-vibration plate 2 is formed in a radial shape in a plan view, and is inserted into a screw portion 5 provided on a shaft portion of the fixed sheave 1, and a washer 3 and a nut 4 are inserted. Is fixed by. The free end of the vibration-proof plate 2 is in contact with the back surface of the fixed sheave 1 and is held in a pressed state by tightening the nut 4. In FIGS. 1 and 2, the movable sheave of the pulley is omitted, and the V-belt 6 wound around the pulley is shown only in cross section.

In the pulley structure of the continuously variable transmission configured as described above, the fixed sheave 1 and the movable sheave (not shown) have V
The vibration of the meshing frequency generated when the belt 6 collides is damped by the vibration damping plate 2, and the vibration order changes. As a result, as shown in the vibration characteristic diagram of FIG. 4, the vibration energy of noise generated by the pulley and the V belt is reduced.

(Effect of the Invention) Since the present invention has the pulley structure of the continuously variable transmission configured as described above, the natural frequency of the fixed sheave is fixed by the vibration-proof plate held in a pressed state on the rear surface of the fixed sheave of the pulley. Is changed, resonance with noise caused by collision between the V-belt and the pulley is avoided, and the operating noise of the continuously variable transmission can be kept quiet.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, FIG. 1 is a partial cutaway view of a fixed sheave side of a pulley showing an essential part of the present invention, and FIG. 2 is a perspective view showing an entire side surface of the fixed sheave side of FIG. FIG. 3 is a diagram for explaining the operation of this device. 1 ... Fixed sheave 2 ... Anti-vibration plate (spring member) 6 ... V-belt

Claims (1)

[Scope of utility model registration request] 1. A radial vibration isolating plate for preventing resonance of the fixed sheave is brought into contact with a back surface of a fixed sheave integrated with a shaft portion constituting a pulley of a continuously variable transmission, and the vibration isolating plate. Is held by the fixed sheave in a pressed state by tightening a nut on a screw portion formed on the shaft portion. A pulley structure for a continuously variable transmission, comprising: