JPH07167259A - Damper pulley - Google Patents

Abstract

PURPOSE:To easily change and adjust the vibration characteristics of the second damper mass in the crossing direction with the axis. CONSTITUTION:The first damper mass 6 is fitted via the first elastic body 5 to the outer periphery side of the cylinder section 4 of a pulley main body 1 provided with a boss section 2 fitted to a rotation output shaft and a cylinder section 4 connected to the boss section 2 via a web section 3, and the second damper mass 9 provided with the second elastic body 8 is pressed into the inner periphery side of the cylinder section 4 in this damper pulley. The second elastic body 8 is fixed to the outer peripheral face of the wholly cylindrical second damper mass 9 and the end faces of both axis directions respectively, recesses 10 located at an interval are provided in the peripheral direction and in at least one of the axial directions, and the stop release plate 7 of the second damper mass 9 is fitted to the cylinder section 4 of the pulley main body 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is of a dual type which is mounted on a rotary output shaft, for example, a crankshaft of an engine, and effectively absorbs both the vibration in the twisting direction and the vibration in the bending direction of the crankshaft. It relates to a damper pulley.

[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. 62-117350.

In this, a pulley body in which a cylindrical portion is integrated with a boss portion via a web portion is attached, and a first damper mass is attached to the outer peripheral side of the cylindrical portion via a first damper rubber. The second damper mass is vulcanized and adhered to the web through a second damper rubber. In such a damper pulley, for example, vibration in the torsional direction of the crankshaft of the engine is mainly , First
The rotational displacement of the damper mass and the vibration of the crankshaft in the bending direction are mainly absorbed by the displacement of the second damper mass in the direction orthogonal to its axis.

[0004]

However, in the prior art, since the second damper rubber is vulcanized and adhered to each of the web portion and the second damper mass, the second damper rubber is used. In order to change the vibration characteristics of the damper mass, and thus the shearing deformation characteristics of the second damper rubber, the second damper mass, the second damper rubber, and
The entire assembly with the pulley body has to be replaced, which makes it very difficult to change or adjust the vibration characteristics of the second damper mass.

Moreover, in this case, the entire pulley main body having a relatively large size and a complicated shape is placed in the mold, and the second damper rubber is provided to each of the web portion of the pulley main body and the second damper mass. Since it is necessary to vulcanize and bond the vulcanization to the vulcanization, there is also a problem in terms of production efficiency that it is difficult to take multiple pieces of the assembly structure by vulcanization and adhesion using one mold.

The present invention has been made as a result of studies to solve such problems of the prior art, and an object of the present invention is to vibrate due to bending vibration of a rotary output shaft. The vibration characteristics of the second damper mass can be easily or quickly changed or adjusted as required. In addition, the second elastic body can be fixed to the second damper mass with excellent work efficiency. To provide a dual type damper pulley, which can be done below.

[0007]

A damper pulley according to the present invention has a boss portion mounted on a rotary output shaft and a cylindrical body integrated with a cylindrical portion via a web portion, on the outer peripheral side of the cylindrical portion. The first damper mass is attached via the first elastic body, and the second damper mass to which the second elastic body is fixed is press-fitted and attached to the inner peripheral side of the cylindrical portion. Then, the second elastic body is fixed to the outer peripheral surface of the second damper mass and the both end surfaces in the axial direction, which are cylindrical as a whole, and the second elastic body is attached to the outer peripheral surface of the second elastic body in the circumferential direction and A recess is provided at a distance in at least one of the axial directions, and a retaining plate for the second damper mass is attached to the cylindrical portion by caulking, screwing, or the like.

[0008]

The damper pulley is mainly adapted to the torsional vibration of the rotary output shaft under the shear deformation of the first elastic body.
The damper mass of is rotationally displaced with respect to the cylindrical part,
With respect to its bending vibration, the second damper mass is mainly displaced under the compressive deformation of the second elastic body in the direction intersecting the axis, and absorbs the respective vibrations. In this damper pulley, in particular, the second bumper mass to which the second elastic body is fixed in advance is press-fitted and fixed to the inner peripheral side of the cylindrical portion of the pulley body.
Since the outer peripheral surface of the elastic body is provided with a plurality of recesses located at intervals in the circumferential direction and / or the axial direction thereof, the vibration characteristics of the second damper mass in the direction intersecting the axial line thereof. Can be changed and adjusted only by changing the material of the second elastic body and the number and size of the recesses.
It can be done very easily and quickly.

In manufacturing the damper pulley, it is not necessary to fix the second elastic body to the pulley body.
When the elastic body of (1) is fixed by vulcanization adhesion, a plurality of vulcanization adhesion can be simultaneously performed by one vulcanization mold, and the production efficiency can be greatly improved.

In addition, here, the second elastic body is fixed not only to the outer peripheral surface of the second damper mass but also to its respective axial end surfaces, so that the second damper mass is fixed. However, even if the web surface of the pulley main body and the retaining plate are collided by vibration or displacement in the axial direction, the collision noise and the impact can be effectively prevented.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an embodiment of the present invention. In the figure, reference numeral 1 denotes a pulley main body, and this pulley main body 1 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 the cylindrical portion 4 is located somewhat deviated to one side in the axial direction with respect to the boss portion 2.

On the outer peripheral side of the cylindrical portion 4 of such a pulley body 1, a first damper mass having a belt groove is provided via a first elastic body 5 which can be rubber or a rubber-like elastic body. Install 6. Here, 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.
To the inner peripheral surface of the first damper mass 6 and a cylindrical portion 7a provided on the retaining plate 7 of the second damper mass described later, and then caulking and fixing the cylindrical portion 7a to the cylindrical portion 4. By doing so, the first elastic body 5 is indirectly attached to the cylindrical portion 4.

On the inner peripheral side of the cylindrical portion 4, a second
Then, the second damper mass 9 to which the elastic body 8 has been fixed beforehand is press-fitted and attached. Here, the second elastic body 8 which can also be made of rubber or a rubber-like elastic body includes the outer peripheral surface of the second damper mass 9 having a cylindrical shape as a whole, as well as the axial direction thereof. It should also be fixed to the end face by vulcanization or the like, and the second elastic body 8 should be positioned on the outer peripheral face at a predetermined interval in the circumferential direction, as shown in FIG. 1 (b), for example. Thus, for example, a recess 10 having a required size is provided that extends over the entire length in the axial direction.

Here, these recesses 10 always have the compression deformation characteristics of the elastic body itself against the vibration in the bending direction of the rotary output shaft, in addition to the selection of the elastic body material, by selecting the intervals and dimensions thereof. The vibration characteristics of the second damper mass 9 in the direction crossing its axis can also be as expected.

Therefore, here, a plurality of types of second damper masses 9 in which the intervals, dimensions, etc. of the recesses 10 of the second elastic body 8 are changed are prepared in advance, and any one of them is prepared as required. It is possible to change and adjust the vibration characteristics of the second damper mass 9 easily and quickly over a wide range while the pulley body 1 remains unchanged.

By the way, the recessed portions 10 may be provided in place of or in addition to the above-mentioned portions at a required interval in the axial direction of the second elastic body 8. In this case,
In addition to extending the recess 10 continuously in the circumferential direction,
It is also possible to extend to trace breaks.

Further, on the retaining plate 7 mentioned above, on the side of the cylindrical portion 4 where the second damper mass 9 is attached,
An inward flange portion 7b, which protrudes from the inner peripheral edge position of the second damper mass 9 to a radially inward position, is provided continuously to the cylindrical portion 7a, and the opening of the cylindrical portion 4 is held by the inward flange portion 7b. Narrows.

In the damper pulley constructed as described above, in particular, the second damper mass 9 is compressed and deformed by the second elastic body 8 fixed in advance, and the cylindrical portion 4 is formed.
Since the second damper mass 9 and the second elastic body 8 are exchanged and exchanged by press-fitting them to the inner peripheral side of the pulley, the pulley body 1 remains as it is, and it is extremely easy and quick. It is possible to replace the second elastic body 8 by replacing the material of the second elastic body 8 with the intervals and dimensions of the recesses 10 provided on the outer peripheral surface of the second elastic body 8 as needed. The vibration characteristics of the damper mass 9 in the direction intersecting the axis can be easily changed and adjusted over a wide range.

By the way, even if the second damper mass 9 is vibrated or displaced in the axial direction and collides with the web portion 3 and the inward flange portion 7b when the second damper mass 9 is attached, noise and impact caused by the collision. The occurrence of
The second elastic body 8 covering the respective end faces of the second damper mass 9 is sufficiently relaxed.

The present invention has been described above with reference to the illustrated example. For example, by forming the retaining plate only with the inward flange portion and screwing it to the end face of the cylindrical portion or the like, the second damper mass is formed. It is also possible to prevent the.

[0021]

As described above, according to the present invention, the vibration characteristic of the vibration of the second damper mass caused by the bending vibration of the rotary output shaft can be easily or promptly changed or adjusted as required. it can.

In addition, since the second elastic body is fixed only to the second damper mass which is small and has a simple structure, the plurality of fixations can be made by, for example, one vulcanizing mold. Can be done at the same time, and therefore
The work efficiency of fixing the second elastic body can be greatly improved.

[Brief description of drawings]

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

[Explanation of reference numerals] 1 pulley body 2 boss portion 3 web portion 4 cylindrical portion 5 first elastic body 6 first damper mass 7 retaining plate 7a tubular portion 7b inward flange portion 8 second elastic body 9 second Damper mass 10 recess

Claims (1)

[Claims] 1. A first elastic body is provided on the outer peripheral side of the cylindrical portion of a pulley body having a boss portion attached to a rotation output shaft and having a cylindrical portion connected to the boss portion via a web portion. A damper pulley in which a first damper mass is mounted via a second damper mass, and a second damper mass provided with a second elastic body is press-fitted and fixed to the inner peripheral side of the cylindrical part thereof. The body is fixed to each of the outer peripheral surface and the both axial end surfaces of the second damper mass, which has a cylindrical shape as a whole, and is spaced at least on one of the outer peripheral surface of the second elastic body in the peripheral direction and the axial direction. A damper pulley in which a recessed portion positioned at is provided, and a retaining plate for the second damper mass is attached to the cylindrical portion of the pulley body.