JP2004239414A - Dynamic damper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dynamic damper which can reduce the manufacturing cost by reducing the number of manufacturing works, enhance the durability, and is externally press-fitted to a rotary shaft part between large diameter parts even when the pair of large diameter parts are arranged on a rotary shaft in the axial direction if the diameter of the large diameter parts is not larger than a predetermined value, and suppress vibrations of the rotary shaft. <P>SOLUTION: The cylindrical dynamic damper comprises a plate rubber-like elastic body 1 wound around a rotary shaft S, and a cylindrical mass member 2 which is externally press-fitted to the rubber-like elastic body 1 wound around the rotary shaft S. One end part of the rubber-like elastic body 1 is formed into a first stepped end part with a step on one plate surface 5 side of the rubber-like elastic body 1, and the other end part of the rubber-like elastic body 1 is formed into a second stepped part with a step on the other plate surface 7 side of the rubber-like elastic body 1. The stepped part of the first stepped end part overlaps the stepped part of the second stepped end part in the direction corresponding to the radial direction of the rotary shaft S when the rubber-like elastic body 1 is wound around the rotary shaft S. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cylindrical dynamic damper which is attached to a rotating shaft and suppresses vibration of the rotating shaft.
[0002]
[Prior art]
A bending shaft or a torsional vibration may be generated on a rotating shaft such as a drive shaft of an automobile due to a rotational imbalance or the like. In such a case, a dynamic damper whose natural frequency is adjusted to the resonance frequency of the rotating shaft is press-fitted onto the rotating shaft and resonated with the rotation of the rotating shaft, and the vibration energy of the rotating shaft is reduced to the vibration energy of the dynamic damper. As a result, the vibration of the rotating shaft is suppressed.
[0003]
Conventionally, as described in Patent Document 1, the above-mentioned dynamic damper vulcanizes a cylindrical rubber-like elastic body which is press-fitted to a rotating shaft on the inner peripheral surface and both ends of a cylindrical mass member. It was formed by molding.
[0004]
[Patent Document 1]
JP 2001-349379 A
[Problems to be solved by the invention]
According to the above-described conventional configuration, the operation of applying the adhesive to the mass member in the vulcanization molding process is required, and the number of operations has increased. Further, the mass member and the rubber-like elastic body may be separated from each other due to fatigue due to repeated rotation, and the durability is not sufficient. If the rotary shaft has a pair of large-diameter portions arranged in the axial direction, the rotary shaft portion between the two large-diameter portions cannot be press-fitted to outside, and such vibration of the rotary shaft cannot be suppressed. There was a problem.
[0006]
An object of the present invention is to reduce the number of operations at the time of manufacturing, reduce manufacturing costs, improve durability, and provide a pair of large-diameter portions arranged on a rotating shaft in the axial direction thereof. Even in the case where the diameter of both large-diameter portions is equal to or less than a predetermined value, a dynamic damper that can be press-fitted onto a rotating shaft portion between the two large-diameter portions and that can suppress vibration of the rotating shaft is provided. .
[0007]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a cylindrical dynamic damper which is attached to a rotating shaft and suppresses vibration of the rotating shaft,
It is composed of a plate-shaped rubber-like elastic body wound around the rotating shaft, and a cylindrical mass member press-fitted to the rubber-like elastic body wound around the rotating shaft,
One end of the rubber-like elastic body in a direction corresponding to the circumferential direction of the rotation shaft is formed at a first stepped end having a step on one plate surface side of the rubber-like elastic body, and The other end of the elastic body is formed at a second stepped end having a step on the other plate surface side of the rubber-like elastic body, and in a state where the rubber-like elastic body is wound around the rotation shaft, The stepped portion of the first stepped end and the stepped portion of the second stepped end are configured to overlap in a direction corresponding to a radial direction of the rotating shaft.
[0008]
According to this configuration, the plate-like rubber-like elastic body is wound around the rotation shaft, and the mass member is press-fitted onto the wound rubber-like elastic body, so that the rubber-like elastic body is vulcanized and molded into the mass member. This is not necessary, and the operation of applying the adhesive for vulcanization to the mass member can be eliminated.
[0009]
Further, by press-fitting the mass member onto the rubber-like elastic body, the two are firmly integrated, and for example, the two can be harder to be separated than a structure in which the two are vulcanized and bonded.
[0010]
And even when the rotating shaft has a pair of large diameter portions arranged in the axial direction, if the diameter of both large diameter portions is smaller than the inner diameter of the mass member, the rotating shaft portion between both large diameter portions also Can be installed.
[0011]
In addition, not only is a rubber-like elastic body of a certain size used in combination with a specific first mass member, but instead of this combination, a second or third mass member having a different mass from the first mass member is used. It is also possible to take measures such as using it in combination with.
[0012]
When the rubber-like elastic body is wound around the rotating shaft, the stepped portion of the first stepped end and the stepped portion of the second stepped end overlap in a direction corresponding to the radial direction of the rotating shaft. The shaft can be covered with a rubber-like elastic body over its entire circumference to prevent the rotation balance of the mass member from being deteriorated, and the rubber member is elastically restored by an elastic restoring force before press-fitting the mass member. Opening of both ends of the elastic body (that is, both ends of the rubber-like elastic body in a direction corresponding to the circumferential direction of the rotating shaft) can be suppressed.
[0013]
According to a second aspect of the present invention, in the first aspect of the present invention, the rubber-like elastic body is located on the first stepped end side of both end faces in a direction corresponding to a circumferential direction of the rotating shaft. One end face abuts the wall surface of the step portion of the second stepped end in the wound state, and the other end face located on the side of the second stepped end has the first stepped shape in the wound state. The first stepped end and the second stepped end are formed so as to contact the wall surface of the step portion at the end.
[0014]
With this configuration, it is possible to prevent a gap from being formed between the two ends of the rubber-like elastic body, and to smoothly connect the inner peripheral surfaces of both ends of the rubber-like elastic body and the outer peripheral surfaces thereof. be able to.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIGS. 1 and 2 show a cylindrical dynamic damper which is mounted on a drive shaft (corresponding to a rotating shaft) S of an automobile and suppresses vibration of the drive shaft S by absorbing vibration energy of the drive shaft S by resonance. Is shown.
[0016]
This dynamic damper includes a rubber elastic body 1 having a rectangular plate shape wound around a drive shaft S (see FIG. 3), and a cylindrical mass member 2 press-fitted onto the rubber elastic body 1 wound around the drive shaft S. Consisting of The mass member 2 is made of metal.
[0017]
Then, one end of the rubber-like elastic body 1 in the direction corresponding to the circumferential direction of the drive shaft S is formed on the first stepped end 3 having a step on one plate surface 5 side of the rubber-like elastic body 1. At the same time, the other end of the rubber-like elastic body 1 is formed on the second stepped end 4 having a step on the other plate surface 7 side of the rubber-like elastic body 1, and the rubber-like elastic body to the drive shaft S is formed. In the wound state 1, the stepped portion 6 of the first stepped end 3 and the stepped portion 8 of the second stepped end 4 overlap each other in a direction corresponding to the radial direction of the drive shaft S. The depth of the two step portions 6 and 8 is set to a half of the thickness of the central portion of the rubber-like elastic body 1.
[0018]
In addition, one end face 9 of the rubber-like elastic body 1 located in the direction corresponding to the circumferential direction of the drive shaft S and located on the first stepped end 3 side is the second end face in the wound state. The other end surface 11 which is in contact with the wall surface 10 of the step portion 8 of the stepped end portion 4 and is located on the side of the second stepped end portion 4 has the wall surface of the stepped portion 6 of the first stepped end portion 3 in the wound state. The length of each of the step portions 6 and 8 (the length in the direction corresponding to the circumferential direction of the drive shaft S) is set so as to abut on the drive shaft 12 (see FIGS. 2 and 4).
[0019]
To attach the dynamic damper having the above structure to the drive shaft S, the rubber-like elastic body 1 is bent in the direction of the arrow X in FIG. 3 and wound around the drive shaft S as shown in FIG. As a result, the step 6 of the first stepped end 3 and the step 8 of the second stepped end 4 overlap in a direction corresponding to the radial direction of the drive shaft S. Further, one end surface 9 of the rubber-like elastic body 1 located on the side of the first stepped end 3 abuts on the wall surface 10 of the stepped portion 8 of the second stepped end 4, and the second stepped end 4 side Is in contact with the wall surface 12 of the step portion 6 of the first stepped end portion 3 in the wound state.
[0020]
Then, a pair of bands are individually wound around both ends of the rubber-like elastic body 1 and temporarily fixed to the drive shaft S. The outer diameter of the rubber-like elastic body 1 wound around the drive shaft S is larger than the inner diameter of the mass member 2 by a set length. The mass member 2 is press-fitted onto the rubber-like elastic body 1. Thereafter, the band is removed from the rubber-like elastic body 1.
[0021]
[Another embodiment]
When the rubber-like elastic body 1 is wound around the drive shaft S, the one end surface 9 and the other end surface 11 of the rubber-like elastic body 1 The stepped end 3 may be separated from the wall surface 12 of the step 6.
[0022]
The rotating shaft is not limited to the drive shaft S, and may be another rotating shaft of an automobile or a rotating shaft provided in a device other than the automobile.
[0023]
【The invention's effect】
According to the configuration of the first aspect, the number of operations at the time of manufacturing can be reduced as compared with the related art, the manufacturing cost can be reduced, the durability can be improved, and a pair of rotary shafts arranged in the axial direction thereof can be arranged. Even if there is a large-diameter portion, if the diameter of both large-diameter portions is smaller than the diameter of the mass member, it can be press-fitted onto the rotating shaft portion between the two large-diameter portions, and the vibration of the rotating shaft can be suppressed. Not only is a rubber-like elastic body having a size used in combination with a specific first mass member, but instead of this combination, it is used in combination with a second or third mass member having a different mass from the first mass member. It is possible to tune to the target frequency even after manufacturing at the factory, prevent the balance of rotation of the mass member from being deteriorated, and Vibration can be suppressed more easily, and mass It is possible to provide a rubber-like elastic body dynamic damper good resistance assembly can be suppressed from both end portions are opened in the elastic restoring force before the wood is press fitted outside.
[0024]
According to the configuration of the second aspect, the inner peripheral surfaces and the outer peripheral surfaces of both end portions of the rubber-like elastic body can be smoothly connected, that is, a step can be formed so that a step is not generated as much as possible. A dynamic damper that can be further improved can be provided.
[Brief description of the drawings]
1 is a longitudinal sectional view of a dynamic damper. FIG. 2 is a cross-sectional view taken along line AA of FIG. 1. FIG. 3 is a view showing a rubber-like elastic body. FIG. 4 is a view showing a state in which the rubber-like elastic body is wound around a rotating shaft. Figure [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rubber-like elastic body 2 Mass member 3 First stepped end (one end of rubber-like elastic body)
4 Second stepped end (the other end of the rubber-like elastic body)
5 One plate surface 6 of rubber-like elastic body 6 Stepped portion of first stepped end 7 Other plate surface 8 of rubber-like elastic body 8 Stepped portion of second stepped end 9 Of both end surfaces of rubber-like elastic body One end face 10 located on the first stepped end side 10 The wall surface 11 of the stepped portion of the second stepped end 11 The other end face 12 located on the second stepped end side of both end faces of the rubber-like elastic body 1st step Wall S of the stepped part at the end with the rotation axis

Claims (2)

A cylindrical dynamic damper attached to a rotating shaft to suppress vibration of the rotating shaft,
It is composed of a plate-shaped rubber-like elastic body wound around the rotating shaft, and a cylindrical mass member press-fitted to the rubber-like elastic body wound around the rotating shaft,
One end of the rubber-like elastic body in a direction corresponding to the circumferential direction of the rotation shaft is formed at a first stepped end having a step on one plate surface side of the rubber-like elastic body, and The other end of the elastic body is formed at a second stepped end having a step on the other plate surface side of the rubber-like elastic body, and in a state where the rubber-like elastic body is wound around the rotation shaft, A dynamic damper configured such that the step portion of the first stepped end and the step portion of the second stepped end overlap in a direction corresponding to a radial direction of the rotating shaft. Of the two end surfaces of the rubber-like elastic body in a direction corresponding to the circumferential direction of the rotating shaft, one end surface located on the first stepped end side is a stepped portion of the second stepped end in the wound state. The first stepped portion so that the other end surface located on the side of the second stepped end contacts the wall surface of the stepped portion of the first stepped end in the wound state. The dynamic damper according to claim 1, wherein the end and the second stepped end are formed.

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