JPH0727205A - Double mass damper pulley - Google Patents

Abstract

PURPOSE:To facilitate a change of a vibration absorbing characteristic of a second damper mass and enhance productivity of a damper pulley after assembling of the damper pulley. CONSTITUTION:In a pulley main body 1 constituted of a boss portion 2, a web portion 3 and a cylindrical portion 4, a first damper mass 6 is fixed to the outer peripheral surface of the cylindrical portion 4 via a first elastic body 5, and a second damper mass 8 formed into a cylindrical shape as a whole is attached to the pulley main body 1 inside the cylindrical portion 4 via a non-contact second elastic body. The second elastic body is constituted of annular elastic members 10 which are compressively deformed at the end surfaces of the second damper mass 8, between the web portion 3 and the same, and between the same and a pressing metal fitting 9 fixed to the opening end of the cylindrical portion 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is mounted on a rotary output shaft, for example, a crankshaft of an engine, and the vibration of the crankshaft in the torsion direction and the vibration of the crankshaft in the bending direction are respectively controlled by the first and second dampers. The present invention relates to a double mass damper pulley that effectively absorbs each displacement of each mass.

[0002]

2. Description of the Related Art A conventional dual type damper pulley of this type is disclosed in, for example, Japanese Utility Model Laid-Open No. 62-68068. This is a pulley body in which a cylindrical portion is integrated with a boss portion via a web portion, and a first damper mass is attached to the outer peripheral surface of the cylindrical portion via a first elastic body. On the inner peripheral side, one end surface of the second damper mass, which has a cylindrical shape as a whole, is vulcanized and adhered to the web portion of the pulley body by the second elastic body. According to this damper pulley, The vibration of the engine crankshaft in the torsional direction is caused by the rotational displacement of the first damper mass based on the deformation of the first elastic body in the shearing direction, and the vibration of the crankshaft in the bending direction is caused by the second elastic body. It is said that each can be absorbed by the displacement of the second damper mass in the direction orthogonal to its axis based on the deformation of the body in the shearing direction.

[0003]

However, in such a prior art, since the second elastic body is vulcanized and adhered to both the second damper mass and the pulley main body,
After assembling the damper pulley, there was a problem that it was not possible to change the vibration absorption characteristics by the second damper pulley, and the vulcanization mold for vulcanizing and adhering the second elastic body became large. Then, there is a problem that the production efficiency is low because it is difficult to obtain multiple surfaces by one vulcanization mold.

The present invention has been made as a result of studies made to solve the above-mentioned problems of the prior art. The object of the present invention is still to be solved even after the damper pulley is assembled. It is possible to easily change the vibration absorbing characteristics of the damper pulley, and to eliminate the need for vulcanization and adhesion of the second elastic body altogether, thereby significantly improving the production efficiency and effectively reducing the manufacturing cost. To provide a double mass damper pulley.

[0005]

A double mass damper pulley according to the present invention comprises a pulley body having a boss portion attached to a rotary output shaft and a cylindrical portion connected to the boss portion via a web portion. The first damper mass is directly or indirectly attached to the outer peripheral surface of the cylindrical portion via the first elastic body, and the second damper mass having a generally tubular shape is provided inside the cylindrical portion. When the second elastic body is attached to the pulley main body via a non-adhesive second elastic body, the second elastic body is attached between the respective end surfaces of the second damper mass and the web portion, and between the cylindrical portion. It is constituted by respective annular elastic members which are interposed between the press fittings attached to the opening end portions and are compressed and deformed.

[0006]

In this double mass damper pulley, the vibration of the rotation output shaft in the torsional direction is mainly caused by the first damper mass being caused by the shear deformation of the first elastic body in the circumferential direction of the cylindrical portion. The rotational displacement of the rotary output shaft in the bending direction of the rotary output shaft is mainly caused by the shear deformation of the second elastic body with respect to the web portion and the holding metal fitting. The damper mass is effectively absorbed by being displaced in a direction intersecting with the axis of the damper mass.

By the way, in this double mass damper pulley, for example, a pressing member is press-fitted into the cylindrical portion of the pulley main body, and the end faces of the second damper mass having a tubular shape are formed in the inner space of the cylindrical portion. , The second damper mass is attached to the pulley body by compressing and deforming each of the annular elastic members in the axial direction between the web portion and the holding metal fitting, respectively. The vibration absorption characteristic of the second damper mass, in other words, the spring characteristic of each annular elastic member and / or the mass of the second damper mass itself is determined by removing the holding metal fitting from the cylindrical portion. Two
By replacing at least one of the damper masses, it is possible to easily and quickly adjust the damper pulley before and after assembling.

Alternatively, here, the second damper mass is attached to the pulley body by the restoring reaction force under compression deformation of each annular elastic member without vulcanizing and adhering them anywhere. The vulcanization molding using a large mold for vulcanizing and adhering the elastic body is unnecessary, and the production efficiency can be greatly improved.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the present invention.
In the figure, reference numeral 1 denotes a pulley main body, which has a boss portion 2 fitted and fixed to a rotation output shaft (not shown), and a cylinder integrally connected to the boss portion 2 via a web portion 3. It has a portion 4, and this cylindrical portion 4 projects to the side opposite to the boss portion 2 with respect to the web portion 3.

In this pulley body 1, an inward flat for fixing the boss portion 2 as a mounting portion to the rotation output shaft to the shaft end of the rotation output shaft, a flange member attached thereto or the like by screwing. You can also change to a face.

A first damper mass having a belt groove is formed on the outer peripheral surface of the cylindrical portion 4 of the pulley body 1 through a first elastic body 5 which can be rubber or a rubber-like elastic body. Install 6.

Here, it goes without saying that the first elastic body 5 can be directly fixed to both the first damper mass 6 and the cylindrical portion 4 by vulcanization adhesion or the like. After fixing the first elastic body 5 to the inner peripheral surface of the first damper mass 6 and the thin-walled tubular member 7,
The first elastic body 5 is indirectly attached to the cylindrical portion 4 by press-fitting the thin-walled tubular member 7 onto the outer peripheral surface of the cylindrical portion 4. According to this, the first elastic body 5 is For example, the vulcanization mold used for vulcanization adhesion can be made simple and small.

This is more remarkable in the embodiment shown in FIG. 2. According to this, the first elastic body 5 is vulcanized and adhered to each of the thin and tubular members 7a and 7b of the inner and outer layers. After that, the first damper mass 6 can be attached to the cylindrical portion 4 by press-fitting it between the cylindrical portion 4 and the first damper mass 6. Therefore, the storage space of the first damper mass can be removed.

Inside the cylindrical portion 4, between the web portion 3 and each end surface of the second damper mass 8 having a cylindrical shape as a whole, in this case, the cylindrical shape, and the open end portion of the cylindrical portion 4. The ring-shaped elastic members 10 interposed between the press-fitting metal fittings 9 mounted on the pulley body 1 are attached to the pulley body 1 under compression deformation. Therefore, here, both annular elastic members 10 function as the second elastic body.

By the way, the mounting of the second damper mass 8 as shown in the drawing may be carried out, for example, by attaching the respective annular elastic members 10 to both end faces of the second damper mass 8, preferably,
Arranged by temporary fixing with adhesive, and
With the second damper mass 8 held at a required position, the tubular insertion portion 9a provided on the edge of the holding metal fitting 9 is pushed into the inside of the cylindrical portion 4 to a predetermined position, and the holding metal fitting 9 is held. Can be carried out by applying a compressive deformation to each annular elastic member 10 as required, whereby the second damper mass 8 is sandwiched between the respective annular elastic members 10 and It will be held in the desired position under the effect of the restoring reaction force of.

Here, the pressing deformation of each annular elastic member 10 by the holding metal 9 is, for example, the cylindrical insertion portion 9
In addition to press-fitting a into the inner peripheral surface of the cylindrical portion, the bending protrusions projecting on the cylindrical portion 4 are bent inward in the radial direction to hold the holding metal fittings 9 and the like. This can also be performed by making the outer edge contour dimension of the flat holding metal fitting 9 having a hole substantially equal to that of the cylindrical portion 4 and screwing the peripheral portion of the holding metal fitting 9 to the end surface of the cylindrical portion 4.

According to the double mass damper pulley constructed as described above, the vibration of the rotation output shaft in the twisting direction is
As described above, mainly under the deformation of the first elastic body 5,
The vibration of the first damper mass 6 in the circumferential direction of the cylindrical portion and in the bending direction is also based on the deformation of the two annular elastic members 10.
, Respectively, are effectively absorbed by the displacement in the direction intersecting the axis.

Here, the vibration absorption characteristics of this damper pulley, especially by the second damper mass 8, are such that the cylindrical portion 4 of the restraint member 9 can be maintained even after the assembly is completed.
It is possible to adjust easily and quickly as desired by attaching / detaching to / from and replacing the annular elastic member 10 and / or the second damper mass 8.

On the other hand, since the annular elastic member 10 here is not vulcanized and adhered anywhere, the annular elastic member itself is extremely efficiently produced without the need for a large vulcanizing mold. can do.

It should be noted that, as shown in the drawing, on the inner peripheral surface of the cylindrical portion 4, the cylindrical portion 4 of the cylindrical insertion portion 9a of the retaining metal 9 is formed.
By providing the shoulder portion 4a that specifies the amount of pushing into the
The amount of compressive deformation of the annular elastic member 10, and by extension, the annular elastic member
The spring characteristics of 10 are kept constant.

FIG. 3 is a sectional view showing another embodiment of the present invention, which is a groove for fitting and positioning the respective annular elastic members 10 on the respective end faces of the second damper mass 8. 8a is provided, and the web portion 3 and the holding metal fitting 9 are also provided with positioning groove 3a and 9b for the annular elastic member 10, respectively.

According to this example, it is possible to obtain the same effects as those of the above-mentioned embodiment, and by fitting the respective annular elastic members 10 into the groove 8a when the second damper mass 8 is assembled. It is possible to accurately hold the annular elastic members 10 in their intended positions without the need for temporary attachment, and to attach them to the annular elastic members 10 after the second damper mass 8 is assembled. In addition, it is possible to effectively prevent the unexpected displacement of the position.

[0023]

As described above, according to the present invention, in particular, since the second elastic body is not adhered to any of the constituent members, the second elastic body is still attached even after the damper pulley is assembled. The vibration absorbing characteristics of the damper pulley can be changed easily and quickly, and the production efficiency of the second elastic body, and by extension, the damper pulley itself can be greatly increased.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing another embodiment of the present invention.

FIG. 3 is a diagram showing still another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1 Pulley main body 2 Boss part 3 Web part 4 Cylindrical part 5 1st elastic body 6 1st damper mass 8 2nd damper mass 9 Holding metal fittings 10 Annular elastic member

Claims (1)

[Claims] 1. A first elastic body is provided on an outer peripheral surface of a cylindrical portion of a pulley body having a cylindrical portion connected to the rotational output shaft and having a cylindrical portion connected to the mounting portion via a web portion. A double mass damper in which the first damper mass is mounted via the second damper mass and the cylindrical second damper mass is mounted inside the cylindrical portion via the second elastic body not bonded to the pulley body. A pulley, wherein the second elastic body is provided between each end surface of the second damper mass and the web portion, and between the metal fittings attached to the open end portion of the cylindrical portion. A double mass damper pulley configured by each annular elastic member that is interposed and compressed and deformed.