JP2530091Y2 - Pulley structure of continuously variable transmission - Google Patents

Description

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

(Prior Art) In a V-belt type continuously variable transmission, as shown in FIG. 6, a fixed sheave 1 is fixed to an input shaft 8 rotated by an engine (not shown). The movable sheave 2 having a conical surface opposed to the movable shaft 2 is provided so as to be movable in the axial direction of the input shaft 8. These pair of sheaves
The input pulley 10 is constituted by 1 and 2. Moving means (not shown) for moving the movable sheave 2 along the input shaft 8 is provided outside the movable sheave 2, and the movable sheave 2 moves and the fixed sheave 1
The pulley pitch diameter of the V-belt groove 12 formed therebetween is changed.

On the other hand, a pair of fixed sheaves 4 and a movable sheave 5 constituting an output pulley 11 are arranged on an output shaft 9 arranged in parallel with the input shaft 8. That is, the fixed sheave 4 is fixed to the output shaft 9, and the movable sheave 5 having a conical surface facing the conical surface of the fixed sheave 4 is provided slidably in the axial direction of the output shaft 9. The movable sheave 5 is also provided with a moving means (not shown), and the movement of the movable sheave 5 changes the pulley pitch diameter of the V-belt groove 12. The V-belt 3 is wound between the input pulley 10 and the output pulley 11, and by changing the pulley pitch diameter of the V-belt groove 12, the input pulley is changed.
The stepless speed change of the driving force transmitted from 10 to the output pulley 11 is performed. A continuously variable transmission having such a structure is disclosed, for example, in Japanese Utility Model Publication No. 1-35093.

(Problems to be Solved by the Invention) However, in such a V-belt type continuously variable transmission, it is inevitable that a slight slippage occurs between the V-belt 3 and the pulleys 10 and 11. Unpleasant noise is generated when the belt 3 and the pulleys 10 and 11 rub against each other. When the V-belt 3 has a structure in which articulated chains or blocks are connected, the blocks and the like are
Vibration and its vibration sound are generated due to collision with sheaves 1, 2, 4, 5 of 0,11.

On the other hand, the pulleys 10, 11 are generally made of a metal material, and the vibration frequency generated between the pulleys 10, 11 and the vibration sound generated between the V-belt 3 and the pulleys 10, 11 resonates.
As a result, there is a problem that the generated sound is amplified and enters the vehicle interior as noise.

An object of the present invention is to solve the above problem and to suppress the vibration generated between the V-belt 3 and the pulleys 10 and 11 of the continuously variable transmission and the generation of the vibration noise.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides an input / output pulley comprising a fixed sheave and a movable sheave which can be moved toward and away from the fixed sheave, and a winding between the two pulleys. A continuously variable transmission having a hung V-belt, a pulley structure in which a vibration damping plate is fixedly adhered to at least a back surface of the fixed sheave, and the back surface of the fixed sheave having a peripheral portion inclined as an inclined surface. It is formed so as to have a concave surface that is recessed toward the axis of the center, and a groove is dug in the outer periphery of the axis at the center of the back surface, while the vibration damping plate is substantially the same as the fixed sheave. It is formed of a steel plate in the shape of a flat disk of the same diameter, has an insertion hole with a diameter slightly smaller than the shaft at the center, and shrinks toward the center that can be expanded through a plurality of cuts in the inner periphery of the insertion hole. With a tapered flange The insertion hole is inserted through the shaft to bring the vibration damping plate into contact with the back surface of the fixed sheave, the flange is fitted and locked in the groove, and the vibration damping plate is screwed at a position near the center. A plate is fixed to the fixed sheave.

(Operation) According to the present invention, the vibration and the vibration noise generated between the V-belt and the pulley can be suppressed by the damping plate, and the quietness in the vehicle interior can be improved.

(Example) Hereinafter, an example of a pulley structure of a continuously variable transmission according to the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment of a continuously variable transmission according to an embodiment of the present invention.
FIG. 3 is a sectional view of output pulleys 10 and 11 and a V-belt 3 wound therebetween. In the figure, the same components as those of the conventional example shown in FIG. 6 are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 1, this embodiment has an input / output pulley.
The rear surfaces of the fixed sheaves 1 and 4 of the respective 10 and 11 (that is, the surfaces opposite to the surface forming the V-belt groove 12; in FIG. A vibration damping plate 6 having the same diameter as each of the fixed sheaves 1 and 4 is tightly fixed to the fixed sheave 4 using screws 7 on the left side surface. As the vibration damping plate, a material having a large vibration damping effect (a vibration damping steel plate or the like) formed into a flat disk shape is used.

The screw 7 is of a short length so that it can be screwed as close to the periphery of the fixed sheaves 1 and 4 as possible. The reason is that each of the sheaves 1, 2, 4, and 5 has a shape in which the thickness decreases toward the periphery, and the periphery of the thinner wall vibrates more than the center of the thicker wall. This is because the adhesion of the damping plate 6 to the peripheral edge of the pulley needs to be particularly high because it is easy. That is, it is desirable to attach the vibration damping plate 6 so as to enhance the vibration damping effect of the peripheral portions of the sheaves 1, 2, 4, and 5.

With such a configuration, in the present embodiment, the vibration damping effect of the damping plate 6 acts to suppress the vibration and the vibration noise generated between the input / output pulleys 10 and 11 and the V-belt 3. it can.

In this embodiment, the damping plate 6 is fixed to the fixed sheave 1,
4 shows an example in which the vibration damping plate 6 is mounted on the rear surface of the movable sheaves 2 and 5, or the present invention is not limited to this. Needless to say, it can be attached to the back of 4,5.

Next, as described above, the vibration damping plate 6 needs to be able to suppress the vibration of the periphery of the sheaves 1, 2, 4, and 5,
It is required that the vibration damping plate 6 and the sheaves 1, 2, 4, and 5 be more firmly adhered to each other at the peripheral edge thereof. FIGS. 2 to 5 show examples in which the improvement for this purpose is performed. In the following embodiment, a structure in which the vibration damping plate 6 is mounted on the fixed sheave 1 of the input pulley 10 is shown.
The same applies to 2, 4, and 5.

In the example shown in FIG. 2 (A), the peripheral edge of the back surface of the fixed sheave 1 is an inclined surface, and the back surface is concave toward the center. On the other hand, as shown in FIG. 3B, the damping plate 6 is formed in a planar shape.

A flange 6B is formed on the inner periphery of the insertion hole 6A of the damping plate 6, and a groove 13 into which the flange 6B fits is formed in the outer periphery of the shaft 8 correspondingly. ing.
As shown in FIG. 3, the flange 6B is formed in a tapered shape that contracts toward the center, and before insertion into the shaft 8, the diameter of the insertion hole 6A is slightly smaller than that of the shaft 8. . When the damping plate 6 is mounted, the flange 6B opens along the outer periphery of the shaft 8, and when the flange 6B reaches the groove 13, it is restored by its elasticity and fitted into the groove 13. At this time, the flange
As shown in FIG. 4, a plurality of cuts 6C are formed in the flange 6B to facilitate the expansion of the 6B.

Since the back surface of the fixed sheave 1 is concave,
It is desirable to fix to the fixed sheave 1 with a screw 7 at a position near the center. Accordingly, as the center of the damping plate 6 comes into close contact with the center of the back of the fixed sheave 1, the peripheral portion is bent in a concave shape corresponding to the back shape of the fixed sheave 1 and the back of the fixed sheave 1 is bent. Adhere to The bent vibration damping plate 6 attempts to return to the original planar shape by the elastic restoring force by the same principle as the flat spring, so that the degree of adhesion at the peripheral edge thereof increases, and the vibration damping plate 6 firmly adheres to the rear surface of the fixed sheave 1.

The operation of mounting the damping plate 6 is performed as follows. That is, when the damping plate 6 is brought into contact with the fixed sheave 1 by inserting the insertion hole 6A into the shaft 8, the peripheral edge of the vibration damping plate 6 first comes into contact with the peripheral edge of the fixed sheave 1. When the center of the damping plate 6 is pushed in from this state, the flange 6B is fitted into the groove 13 and locked. In this state, since a portion between the center and the peripheral edge of the damping plate 6 is floating, the entire surface of the damping plate 6 is tightly fixed to the rear surface of the fixed sheave 1 by fixing this portion with the screw 7. You.

Next, in the example shown in FIG. 5 (A), the back surface of the fixed sheave 1 is a flat surface like the one shown in FIG. As shown in ()), the damper plate 6 has a flat spring shape, and is inserted through the shaft 8 with its concave side facing the rear surface of the fixed sheave 1.

The periphery of the damping plate 6 inserted into the shaft 8 first comes into contact with the periphery of the fixed sheave 1. In this state, since the center of the damping plate 6 is floating, the center of the damping plate 6 is pushed in, and the damper 6
Is fixed.

Also in this case, similar to the example shown in FIG. 2,
The elastic restoring force acts on the damping plate 6 based on the principle of the flat spring, and the adhesion of the peripheral edge portion of the damping plate 6 to the back surface of the fixed sheave 1 is increased, so that the damping effect of vibration and vibration noise can be obtained well. Can be

Also, according to the examples shown in FIGS.
Is located at or near the center of the fixed sheave 1, a screw hole can be formed at a position where the thickness of the fixed sheave 1 is large. Accordingly, the fixing strength can be increased by increasing the length of the screw 7, and the vibration suppressing effect can also be improved.

(Effects of the Invention) As described above in detail, the present invention provides an input / output pulley composed of a fixed sheave and a movable sheave that can be moved toward and away from the fixed sheave, and a V wound around the two pulleys. A continuously variable transmission having a belt, a pulley structure in which a damping plate is fixedly attached to at least the rear surface of the fixed sheave, and the peripheral portion of the rear surface of the fixed sheave is an inclined surface, and the rear surface is an axis having a central portion. And a groove is dug in the outer periphery of the shaft at the center of the rear surface, while the vibration damping plate has a flat surface having substantially the same diameter as the fixed sheave. It is formed of a steel plate in the shape of a disc, and has an insertion hole with a diameter slightly smaller than the axis at the center, and a tapered shape that contracts toward the expandable center through a plurality of cuts on the inner periphery of the insertion hole. Equipped with a flange for the insertion A hole is inserted through the shaft to bring the damping plate into contact with the rear surface of the fixed sheave, the flange is fitted and locked in the groove, and the fixed damping plate is screwed at a position close to the center. As the center part of the damping plate comes into close contact with the center part of the back of the fixed sheave with screws, the peripheral part is bent in a concave shape corresponding to the back shape of the fixed sheave, and The damping plate that is tightly attached to the back and tries to return to the original flat shape by its elastic restoring force based on the same principle as a coned disc spring. I do. Vibration and vibration noise generated between the V-belt and the pulley can be satisfactorily suppressed by the close-fitting vibration damping plate, thereby reducing the operation noise of the continuously variable transmission and improving the quietness of the vehicle interior. It has the effect that can be.

[Brief description of the drawings]

FIG. 1 is a side view showing a partial cross section of a pulley structure of a continuously variable transmission according to an embodiment of the present invention, and FIG. 2 (A) is a diagram illustrating another embodiment of the present invention. FIG. 3B is a cross-sectional view showing the vibration plate, FIG. 3B is a cross-sectional view showing a state before the vibration control plate is attached, FIG. 3 is a cross-sectional view showing the vicinity of a flange formed at the center of the vibration control plate, FIG. Fig. 5 is a plan view of the damping plate, Fig. 5 (A) is a sectional view showing a fixed sheave and a damping plate in still another embodiment of the present invention, and Fig. 5 (B) is a sectional view of the damping plate. FIG. 6 is a side view showing a partial cross section of a pulley structure of a conventional continuously variable transmission. 1,4 ... fixed sheave, 2,5 ... movable sheave 3 ... V-belt, 6 ... damping plate 6A ... insertion hole, 6B ... flange 6C ... cut, 7 ... screw 8 ... Input shaft 9, Output shaft 10 Input pulley 11, Output pulley 12 V-belt groove 13, Groove

Claims (1)

(57) [Scope of request for utility model registration] At least one of a continuously variable transmission having an input / output pulley comprising a fixed sheave and a movable sheave which can be moved toward and away from the fixed sheave, and a V-belt wound between the pulleys. A pulley structure in which a vibration damping plate is fixedly attached to the rear surface of the fixed sheave, and the peripheral portion of the rear surface of the fixed sheave is formed as an inclined surface so that the rear surface is a concave surface that is concave toward the axis of the center. A groove is dug in the outer periphery of the shaft at the center of the back surface, and the damping plate is formed of a steel plate in a flat disk shape having substantially the same diameter as the fixed sheave. It has an insertion hole slightly smaller in diameter than the shaft, and has a tapered flange that contracts toward the center that can be expanded through a plurality of cuts on the inner periphery of the insertion hole, and the insertion hole is Insert the vibration control plate through the shaft A pulley for a continuously variable transmission, wherein the pulley is abutted against a back surface of a fixed sheave, the flange is fitted and locked in the groove, and the damping plate is fixed to the fixed sheave by a screw near a center. Construction.