JP2012207695A - Dynamic damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dynamic damper that can provide stable damping performance by suppressing vibration in a rotational direction of a mass member.SOLUTION: The dynamic damper includes: a pair of supporting members 12 that are fixed to a vibration source side; the mass member 14 that is provided between the pair of the supporting members 12; and a rubber elastic body 16 that connects the pair of supporting members 12 and the mass member 14. The rubber elastic body 16 includes a wall-like main connecting part and an auxiliary connecting part extending vertically from both ends of the main connecting part.

Description

  The present invention relates to a dynamic damper that is incorporated in a vehicle such as an automobile and reduces vibration thereof.

  In vehicles such as automobiles, dynamic dampers may be incorporated in order to suppress vibrations of vibration sources such as members constituting the vehicle body, suspension parts, exhaust pipes, and doors. The dynamic damper is intended to reduce the vibration of the vibrating body by tuning the natural frequency of the sub-vibration system constituted thereby to the natural frequency of the vibrating body, and various proposals have been made conventionally. (For example, refer to Patent Documents 1 and 2 below).

  FIG. 4 shows a dynamic damper 100 according to a conventional example. As illustrated, the dynamic damper 100 includes a pair of support members 102 fixed to the vibration source side, a mass member 104 provided between the pair of support members 102, a pair of support members 102, and the mass member 104. And a rubber elastic body 106 for connecting the two.

Japanese Patent Laid-Open No. 9-184538 JP 2000-18317 A

  In the dynamic damper 100 according to such a conventional example, since the rubber elastic body 106 connected to both ends supports the mass member 104, the mass member 104 becomes a rubber elastic body 106 indicated by an arrow R in FIG. It tends to vibrate in the rotational direction around a straight line connecting the supported positions. Such vibration in the rotation direction R of the mass member 104 is often at a frequency close to the vibration in the translational direction (for example, the direction indicated by the arrow X in FIG. 4) as the originally required resonance mode. When both are coupled, there is a problem that the resonance magnification of the translation mode is lowered, and the target performance cannot be obtained.

  It is also conceivable to suppress vibration in the rotation direction R of the mass member 104 by providing the rubber elastic body 106 thick or providing a plurality of rubber elastic bodies 106 at intervals.

  However, the dynamic damper 100 tunes the resonance frequency to be suppressed by appropriately setting the mass of the mass member 104 and the spring constant of the rubber elastic material 106. It may not be possible to provide a thick wall. In addition, since the dynamic damper 100 is strongly demanded to be lightweight and downsized, the surface of the mass member 104 connecting the rubber elastic bodies 106 is narrow, and it is difficult to provide a plurality of rubber elastic bodies 106 at intervals. There is a problem that the rubber elastic body 106 is easily broken when the rubber elastic body 106 is removed from the vulcanization mold.

  This invention is made | formed in view of the above point, and it aims at providing the dynamic damper which can ensure the stable damping performance by suppressing the vibration of the rotation direction of a mass member.

  The dynamic damper according to the present invention includes a pair of support members fixed to the vibration source side, a mass member provided between the pair of support members, and a rubber connecting the pair of support members and the mass member. An elastic body, wherein the rubber elastic body includes a wall-shaped main coupling portion and an auxiliary coupling portion extending vertically from both ends of the main coupling portion.

  In the present invention, the auxiliary connecting portion may be provided so as to extend vertically from both sides of the main connecting portion.

  In the present invention, the rubber elastic body that couples the mass member to the support member includes the wall-like main coupling portion and the auxiliary coupling portion that extends vertically from both ends thereof, thereby suppressing vibration in the rotational direction of the mass member. And stable vibration control performance can be secured.

1 is a plan view of a dynamic damper according to a first embodiment of the present invention. It is a front view of the dynamic damper shown in FIG. It is AA sectional drawing of FIG. It is a top view of the dynamic damper which concerns on a prior art example.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  The dynamic damper 10 of the present embodiment is incorporated in the back door of an automobile to prevent abnormal noise caused by the vibration of the back door, and as shown in FIG. A pair of support members 12 fixed to the mounting surface F, a mass member 14 provided between the pair of support members 12, and a rubber elastic body 16 connecting the pair of support members 12 and the mass member 14. Prepare. In the following description, with respect to the translational direction and the lateral direction of each part of the dynamic damper 10, the direction indicated by the arrow X in FIGS. 1 and 2 showing the state where the dynamic damper 10 is attached to the back door, The direction indicated by the arrow Y is the left-right direction, and the direction indicated by the arrow Z is the up-down direction.

  The pair of support members 12 are metal fittings having the same shape, and are arranged along the mounting surface F inside the back door and fixed to the mounting surface F by fixing means (not shown) such as bolts. And a support plate 20 that rises perpendicularly from the one end of the fixed plate 18 in the translational direction X.

  The mass member 14 is a rectangular parallelepiped metal member that is long in the left-right direction Y, and is opposed to the support plate 20 provided in the pair of support members 12 with a predetermined interval in the left-right direction Y.

  The rubber elastic bodies 16 are respectively interposed between the fixing plates 18 of the pair of support members 12 and the left and right side surfaces of the mass member 14 opposed thereto. Thus, the pair of support members 12 are configured to elastically support the mass member 14 via the pair of rubber elastic bodies 16 on the fixed plate 18.

  As shown in FIG. 3, the rubber elastic body 16 includes a wall-like main coupling portion 22 that extends along the vertical direction Z, and an auxiliary coupling that extends vertically from the vertical ends of the main coupling portion 22, that is, in the translational direction X. Part 24. The auxiliary connecting portion 24 extends from both sides of the main connecting portion 22 in the translational direction X, whereby the rubber elastic body 16 has an H-shaped cross section. Such a rubber elastic body 16 having an H-shaped cross section is formed to extend in the left-right direction Y, and both ends thereof are vulcanized and bonded to the mass member 14 and the fixing plate 18 of the support member 12.

  At both end portions in the left-right direction Y of the mass member 14, stopper rubber portions 26 that surround the peripheral surface over the entire circumference are provided. The stopper rubber portion 26 prevents the mass member 14 from directly colliding with surrounding members when the mass member 14 is excessively displaced, and is integrally vulcanized and formed by a rubber material continuous from the rubber elastic body 16.

  In the dynamic damper 10 of the present embodiment as described above, the rubber elastic body 16 that connects the mass member 14 to the support member 12 includes the wall-like main connection portion 22 and the auxiliary connection portion 24 that extends vertically from both ends thereof. Therefore, it is possible to increase the moment of inertia of the cross section of the rubber elastic body 16 and to suppress the vibration in the rotation direction around the straight line connecting the pair of rubber elastic bodies 16 and to exhibit stable vibration control performance. Can do.

  The rubber elastic body 16 and the stopper rubber portion 26 are formed by setting the mass member 14 and the support member 12 in a molding die (not shown) and vulcanizing the rubber material. By adopting such a cross-sectional shape, the rubber elastic body 16 is hard to be caught and easily broken at the time of demolding.

  In the above-described dynamic damper 10 of the present embodiment, the auxiliary connecting portion 24 is extended from both sides of the main connecting portion 22 in the translation direction X, and the rubber elastic body 16 is provided in an H-shaped cross section. For example, the rubber elastic body 16 may be provided in a U-shaped cross section by extending the auxiliary connecting portion 24 from one side of the main connecting portion 22 in the translational direction X.

DESCRIPTION OF SYMBOLS 10 ... Dynamic damper 12 ... Support member 14 ... Mass member 16 ... Rubber elastic body 18 ... Fixed plate 20 ... Support plate 22 ... Main connection part 24 ... Auxiliary connection part 26 ... Stopper rubber part F ... Mounting surface

Claims (2)

    A pair of support members fixed to the vibration source side, a mass member provided between the pair of support members, and a rubber elastic body connecting the pair of support members and the mass member, the rubber The elastic body includes a wall-like main coupling portion and auxiliary coupling portions extending vertically from both ends of the main coupling portion.     The dynamic damper according to claim 1, wherein the auxiliary connecting portion extends vertically from both sides of the main connecting portion.

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