JP6089719B2 - Dynamic damper - Google Patents

Description

The present invention relates to a dynamic damper .
The present invention also relates to a dynamic damper that is attached to an inner circumferential space of a hollow rotating shaft such as a propeller shaft of an automobile and suppresses vibration and noise generated in the hollow rotating shaft.

  The dynamic damper is used for the purpose of improving the vibration characteristics by reducing torsional vibration and bending vibration (vibration in the direction perpendicular to the axis of the propeller shaft) of the torque transmission tube, such as the propeller shaft, in the power transmission system of the automobile. Yes.

Conventionally, a dynamic damper having a structure shown in FIG. 4 is known. (Patent Document 1)
That is, the damper mass 100 is disposed at the inner peripheral axial core portion of the outer ring 500, and the rubber-like elastic body 200 that elastically connects the outer ring 500 and the damper mass 100 is disposed.

  With such a configuration, there is an advantage that it is possible to cope with a thin pipe diameter, but it is difficult to obtain sufficient durability because a sufficient space for the rubber-like elastic body 200 cannot be secured.

As a dynamic damper improved in this respect, a structure shown in FIG. 5 is known.
The damper damper 100 is composed of a columnar damper mass 100 and rubber-like elastic bodies 200 and 200 integrally formed on annular step portions provided on the outer peripheral surface sides at both axial ends of the damper mass 100. This type of dynamic damper has better durability than that of the structure shown in Fig. 4, but it is not a compression type but a shear type, so the holding power is inferior, and the problem of falling off the mounting pipe (propeller shaft, etc.) Invited.

In addition, the shape of the rubber-like elastic body 200 is large and complicated, and since it is integrally formed with the damper mass 100, it takes time for preheating when forming using a mold, resulting in a problem that the molding cost increases.
In addition, every time the dynamic damper specifications change, it is necessary to build a large and expensive mold.

JP 2008-25799 A

  An object of the present invention is to provide a dynamic damper capable of improving the holding force of the dynamic damper to the mounting pipe, flexibly responding to specification changes, and reducing the molding cost.

The dynamic damper of the present invention includes a columnar damper mass, a rubber-like elastic body fitted on the outer peripheral surface side at both axial ends of the damper mass, and a propeller shaft fitted on the outer circumference of the rubber-like elastic body. In the dynamic damper, a concave / convex engaging portion in which an adhesive is applied is formed on a fitting portion between the rubber-like elastic body and the damper mass, and a spring member is provided on the concave-convex engaging portion on the rubber-like elastic body side. It is embed | buried and is pressing the said rubber-like elastic body on the outer peripheral surface of the said damper mass, It is characterized by the above-mentioned.

The present invention has the following effects.
According to the dynamic damper of the first aspect of the present invention, since the concave / convex engaging portion in which the adhesive is applied is formed on the fitting portion between the rubber-like elastic body and the damper mass, the holding force to the mounting pipe is increased. In addition to being able to respond flexibly to changes in specifications, and the rubber-like elastic body and the concave and convex engaging part of the damper mass fitting part are bonded with adhesive, the holding force to the mounting pipe is more reliable In addition, since the spring member is embedded in the concavo-convex engaging portion of the fitting portion between the rubber-like elastic body and the damper mass, the holding force for the mounting pipe can be further improved.

Furthermore, according to the dynamic damper of the invention described in claim 2 , since a gap is provided between the outer peripheral surface of the damper mass and the peripheral surface of the rubber-like elastic body, a shear element can be taken in and the rigidity can be kept low. Durability can be ensured, and even if a large displacement is input, the elastic elastic body comes into contact with the outer peripheral surface of the damper mass and exerts a stopper function to regulate the displacement to the elastic rubber body and stabilize It is possible to continue the holding force .

1 is a longitudinal sectional view of a dynamic damper according to a first embodiment of the present invention. The longitudinal cross-sectional view which mounted | wore the inner periphery of the propeller shaft with the dynamic damper of FIG. The longitudinal cross-sectional view of the dynamic damper which concerns on the 2nd embodiment of this invention. The longitudinal cross-sectional view of the dynamic damper which concerns on a prior art. The longitudinal cross-sectional view of the other dynamic damper which concerns on a prior art.

Hereinafter, embodiments for carrying out the present invention will be described.
As shown in FIGS. 1 and 2, the first embodiment of the dynamic damper according to the present invention is fitted with a columnar damper mass 1 made of a metal material and the outer peripheral surface sides of both ends of the damper mass 1 in the axial direction. The rubber-like elastic bodies 2 and 2 and the propeller shaft 3 fitted on the outer circumferences of the rubber-like elastic bodies 2 and 2 are provided.
An uneven engagement portion 4 is formed at the fitting portion between the rubber-like elastic bodies 2, 2 and the damper mass 1.

  Although this uneven | corrugated engagement part 4 was set as the aspect which engages the annular groove and annular protrusion of a rectangular cross section, the aspect which engages the circular groove | channel and annular protrusion of a circular cross section or a triangular section may be sufficient, Protrusions and holes provided at equal intervals on the circumference may be used instead of the annular shape.

Further, the rubber-like elastic bodies 2 and 2 have an annular shape with a rectangular cross section, and form axial protrusions 24 that engage with the annular step portions 11 provided at both axial end portions of the damper mass 1. It is.
Further, a cylindrical protrusion 22 extending from the axial protrusion 24 along the outer peripheral surface of the damper mass 1 is formed, and an annular protrusion 23 extending radially inward is provided at the tip of the cylindrical protrusion 22. Yes.

On the other hand, an annular groove 12 that engages with the annular protrusion 23 is formed on the outer circumferential surface of the damper mass 1, and the annular groove 12 and the annular protrusion 23 engage with each other to form the concavo-convex engaging portion 4. ing.
Further, before the rubber-like elastic bodies 2 and 2 and the damper mass 1 are fitted, the uneven engagement portion 4 is preliminarily coated with an adhesive. As shown in FIG. After the propeller shaft 3 is fitted on the outer circumferences of the bodies 2 and 2, the adhesive firmly integrates the rubber-like elastic bodies 2 and 2 and the damper mass 1 by preheating when the propeller shaft 3 is dried. .

Next, a second embodiment of the dynamic damper according to the present invention will be described with reference to FIG.
The difference from the first embodiment described above is that the axial protrusion 24 and the annular step portion 11 that are present in the first embodiment are not present in the second embodiment, and that the first embodiment is different from the first embodiment. In the second embodiment, two annular protrusions 23 and two annular grooves 12 exist, and one of the annular protrusions 23 includes a spring member 21 in each of the annular protrusions 23 and the annular grooves 12. In other words, the gap 5 is provided between the outer peripheral surface of the damper mass 1 and the rubber-like elastic body 2 and the inner peripheral surface of the damper mass 1.
With such a configuration, the holding force for the mounting pipe can be further improved, and a gap 5 is provided between the outer peripheral surface of the damper mass 1 and the inner peripheral surface of the rubber elastic body 2. Incorporating a shearing element, the rigidity can be kept low, ensuring durability, and even if a large displacement is input, the rubber-like elastic body 2 comes into contact with the outer peripheral surface of the damper mass 1 and exhibits a stopper function. Thus, displacement to the rubber-like elastic body 2 is restricted, and a stable holding force can be continued.

Next, a method for manufacturing a dynamic damper according to the present invention will be described.
First, a hollow cylindrical damper mass 1 made of a metal material is prepared, and then, as shown in FIG. It is made to fit in the outer peripheral surface side.
Under the present circumstances, the adhesive agent is apply | coated beforehand to the fitting area | region in which the uneven | corrugated engaging part 4 of the damper mass 1 and the rubber-like elastic bodies 2 and 2 was provided.

Next, as shown in FIG. 2, after the rubber-like elastic bodies 2, 2 are fitted on the inner peripheral surface of the propeller shaft 3, a coating drying process is performed on the propeller shaft 3.
By preheating at the time of this paint drying process, the adhesive previously applied to the fitting region provided with the concave and convex engaging portions 4 of the damper mass 1 and the rubber-like elastic bodies 2 and 2 becomes the rubber-like elastic bodies 2 and 2. And damper mass 1 are firmly integrated.

  Further, when the rubber-like elastic bodies 2 and 2 are fitted to the inner peripheral surface of the propeller shaft 3, the damper mass 1 and the rubber-like elastic bodies 2 and 2 are not integrated by the adhesive, but the uneven engagement portion 4 Therefore, the rubber-like elastic bodies 2 and 2 and the propeller shaft 3 are not separated.

  The rubber-like elastic body 2 is made of natural rubber (NR), ethylene / propylene / diene rubber (EPDM), butyl rubber, fluorine rubber, nitrile rubber, chloroprene, or other rubber-like elastic materials, polyester elastomer, thermoplastic polyurethane, etc. The thermoplastic elastomer is appropriately selected according to the intended use, but butyl rubber having a large damping effect is preferable.

  Further, the present invention is not limited to the best mode for carrying out the invention described above, and various other configurations can be adopted without departing from the gist of the present invention.

  The dynamic damper according to the present invention can be used for a torque transmission tube, such as a propeller shaft, in a power transmission system of an automobile.

DESCRIPTION OF SYMBOLS 1 Damper mass 2 Rubber-like elastic body 3 Propeller shaft 4 Concavity and convexity engagement part 5 Gap 11 Annular step part 12 Annular groove 21 Spring member 22 Cylindrical protrusion 23 Annular protrusion 24 Axial protrusion

Claims (2)

Columnar damper mass (1), rubber-like elastic bodies (2) and (2) fitted on the outer peripheral surface sides at both axial ends of the damper mass (1), and the rubber-like elastic body (2), In the dynamic damper comprising the propeller shaft (3) fitted on the outer periphery of (2),
The rubber-like elastic body (2) is formed by forming an uneven engagement portion (4) in which an adhesive is applied to a fitting portion between the rubber-like elastic body (2), (2) and the damper mass (1 ). A spring member (21) is embedded in the concave-convex engaging portion (4) on the (2) side, and the rubber-like elastic bodies (2), (2) are pressed against the outer peripheral surface of the damper mass (1). dynamic damper, characterized in that there. The dynamic damper according to claim 1 , wherein a gap (5) is provided between the outer peripheral surface of the damper mass (1) and the rubber-like elastic body (2), (2) inner peripheral surface .

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