JP2006258223A - Dynamic damper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate dimensional variation or the like of a retaining fixture when the retaining fixture for retaining an rubber elastic body is formed in a predetermined shape when the rubber elastic body mounted with a mass member in a dynamic damper is made to the predetermined initial state. <P>SOLUTION: In the dynamic damper, an inner fixture mounted with the mass member is retained in an outer fixture through the rubber elastic body in a hanged state. The inner fixture is formed in a U shape and a recession/projection part is formed on a bottom wall. The inner fixture is projected to the predetermined outside by pressing the recession/projection part of the bottom wall from above. The mass member is mounted to the inner fixture by making the rubber elastic body into a required compressed state. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a dynamic damper attached to an automobile for the purpose of vibration and sound insulation.

  Dynamic dampers are attached to the undercarriages of automobiles in order to prevent vibrations of wheels and the like from being transmitted to the vehicle body. This type of dynamic damper has a mass member attached to a holding bracket in a suspended state via a rubber elastic body, but since the frequency of vibration input to the automobile can be verified, the spring characteristics of the rubber elastic body And the mass characteristics of the mass member are adjusted to resonate the mass member at the vibration frequency to prevent vibration. In this case, in order to stably exhibit the spring characteristics of the rubber elastic body, it is necessary to set the rubber elastic body to an initial state in which the rubber elastic body is compressed to some extent. In addition, since the spring constant varies depending on the degree of compression, it is necessary to adjust the degree of compression in order to obtain a desired spring constant.

For this reason, compression is achieved by various methods, and the following Patent Document 1 discloses a method in which a rubber elastic body connected to a mass member is tightened and compressed by a bolt and nut. According to this, bolts must be tightened one by one, and it takes a lot of time and is not suitable for mass production. On the other hand, in Patent Document 2, a rubber elastic body is vulcanized and bonded between a mass member and a holding metal fitting, and the holding metal fitting is squeezed from the outside so that a predetermined compression state appears in the rubber elastic body. It is shown. However, according to this, since the mounting holes are formed in the holding metal fitting, if the mounting holes are deformed, the position may be changed and the flatness of the mounting surface may be changed. Moreover, since the holding metal fitting to which the mass member is attached has to be squeezed, there is a disadvantage that handling is heavy.
JP 2001-234970 A JP 2003-097635 A

  The present invention solves such a problem. In short, the metal fitting for attaching the mass member is made different from the holding member for attaching to the vibrating body, and the metal is attached to the rubber by stretching the metal fitting outward. The elastic body is compressed to a predetermined level, and the holding bracket itself is not required to be crafted.

  Under the above-mentioned problems, the present invention provides a dynamic damper in which an inner metal fitting in which a mass member is attached to an outer metal fitting is held in a suspended state via a rubber elastic body. The bottom wall is made uneven, and the bottom wall is pressed from above to cause the inner metal part to protrude outwards to a predetermined compression state. A dynamic damper having a member attached thereto is provided.

  According to the present invention, in the dynamic damper in which the inner metal fitting in which the mass member is attached to the outer metal fitting is held in a suspended state via a rubber elastic body, the inner metal fitting is bent inward on the side wall. The U-shaped one, and the side wall is pushed outward to bend the inner metal part in a predetermined outward direction, the rubber elastic body is in the required compression state, and the mass member is attached to the inner metal part. A dynamic damper is provided.

  According to the present invention, in the above-described dynamic damper, means for bending the upper end of the inner metal fitting inward and holding the mass member from above by pressing the mass member from above is provided. A means is provided in which a protrusion is directed upward on a wall and a mass member is fitted to the protrusion.

  According to the means of claim 1, if the unevenness of the bottom wall of the inner metal fitting is pressed, the bottom wall extends and the side wall projects outward, so that the rubber elastic body is compressed as required. Of course, the spring constant can be adjusted by adjusting the overhang amount. In this process, the mass member is not yet attached to the inner metal fitting, so that the operation and the process are easy. The same applies to the means of claim 2 and the operation and processing are easy. Further, according to the means of claims 3 and 4, it is easy to attach the mass member to the inner metal fitting (no welding or the like is required), and no positional deviation or the like occurs after the attachment. Is certain.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a partially sectional side view showing a manufacturing process of a dynamic damper according to the first aspect of the present invention, and FIG. 3 is a partially sectional plan view after completion. This dynamic damper includes an outer metal fitting 1 and an inner metal fitting 2. And the mass member 3 and the like. Among these, the outer metal fitting 1 is attached to the vibrating body and receives the inner metal fitting 2 and the mass member 3. In this example, the side wall 6 and the side wall 5 and the flange 6 are provided on the upper end of the side wall in a side view. (7 is a mounting hole provided in the bag). In addition, this shape of the outer metal fitting 1 is performed by plastic working.

  The inner metal fitting 2 holds the mass member 3 and is held in a suspended state via the rubber elastic body 8 with respect to the outer metal fitting 1. In this example, the inner metal fitting 2 is separated from the bottom wall 9 and the side wall 10 in a side view. It has a U shape. In this case, generally, the thickness of the inner metal fitting 2 is thinner than that of the outer metal fitting 1, but the planar shape of both is different. In addition, the inner metal fitting 2 of the present example has a bottom wall 9 formed with irregularities 11, and a circular protrusion 12 is formed at the center of the bottom wall 9. In addition, formation of these unevenness | corrugations 11 and protrusion 12 is all performed by plastic working.

  A rubber elastic body 8 is vulcanized and bonded to the outer surface of the side wall 10 of the inner metal fitting 2 and the inner surface of the side wall 5 of the outer metal fitting 1, and the inner metal fitting 2 is interposed in the outer metal fitting 1 via the rubber elastic body 8. Stored in a suspended state. The mass member 3 is attached to the inner metal fitting 2 and the mass member 3 vibrates, thereby preventing vibration from the vibrating body to which the outer metal fitting 1 is attached. In the present invention, after the inner metal fitting 2 is attached to the outer metal fitting 1, the following operation is performed. FIG. 2 is a cross-sectional side view showing this state. An underlay 13 is laid under the bottom wall 9 of the inner metal fitting 2 and pressed from above with a mold 14. As a result, the unevenness 11 of the bottom wall 9 is squashed and the side wall 10 projects outwardly by R.

  Therefore, the rubber elastic body 8 is compressed with this overhang amount R, and its spring characteristics appear stably. In general, only by vulcanizing and bonding the rubber elastic body 8 does not provide stable spring characteristics, which is an improvement. In addition, if the fall amount of the metal mold | die 14 is adjusted, since the amount of scooping (projection amount R) of the unevenness | corrugation 11, ie, the compression degree of the rubber elastic body 8, can be adjusted, the spring constant can also be adjusted by this.

  When the above treatment is completed, the mass member 3 is mounted on the bottom wall 9 of the inner metal fitting 2. At this time, the mass member 3 is fitted into the protrusion 12 formed on the bottom wall 9 of the inner metal fitting 2. If the hole 15 to be joined is formed and this hole 15 is fitted to the protrusion 12, positioning and displacement prevention can be achieved. Further, the upper end of the side wall 10 of the inner metal fitting 2 is pressed downward by a mold (not shown), and this portion is bent inward to form a curl 16. Therefore, when the diameter of the curl 16 increases or decreases with respect to the dimensional error of the mass member 3, the mass member 3 is pressed from above, and the mass member 3 is detached from the inner metal fitting 2. Can be prevented. This simplifies the mounting of the mass member 3 to the inner metal fitting 2 and does not require complicated welding or bolting.

  FIG. 4 is a partially sectional side view showing the manufacturing process of the dynamic damper according to the second aspect of the present invention. The difference between the present invention and the first aspect is that the side wall 10 of the inner metal fitting 2 is bent inward in advance. In this state, the rubber elastic body 8 is vulcanized and bonded. Then, the side wall 10 is pushed and bent outward to bring the rubber elastic body 8 into a required compression state, and then the mass member 3 is held. It may be combined with the unevenness 11 described above.

  FIG. 5 is a partial cross-sectional side view showing the principle of outward bending of the side wall 10, but the expansion body 17 formed on the inclined surface in which the outer surface is upright and the inner surface extends upward is shown in FIG. It is inserted inside and the wedge 18 is inserted into the expansion body 17 from above to move the expansion body 17 outward and push and bend the side wall 9 outward. Thereby, the side wall 9 of the inner metal fitting 2 is projected outward by S, and as a result, the rubber elastic body 8 is compressed by the projecting amount S. In addition, about attachment of the mass member 3, etc., it is the same as 1st invention.

Although the present invention has been described above, its operation and effect will be described again as follows.
1. Since the degree of compression of the rubber elastic body can be arbitrarily adjusted, the spring constant can be easily adjusted.
2. Since the mass member can be easily attached, it is easy to change to a mass member having a different weight.
3. Since the mass member is attached by a mechanical configuration, a small dimensional error can be absorbed, and as a result, the contact-side end face may be as-cast.
4). At the stage of vulcanizing and bonding the rubber elastic body, since the mass member is not yet attached, the weight is light and the handling is easy.
5. Since various processes such as various forming of the outer and inner metal fittings and holding of the mass member are based on plastic working (no machining is required), the productivity is good and the working environment is improved.

It is a partial cross section side view which shows the manufacturing process of the dynamic damper of 1st invention. It is a cross-sectional side view which shows the shaping | molding method of 1st invention. It is a partial cross section top view of the dynamic damper of the 1st invention. It is a partial cross section side view which shows the manufacturing process of the dynamic damper of 2nd invention. It is a cross-sectional side view which shows the shaping | molding method of 2nd invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer metal fitting 2 Inner metal fitting 3 Mass member 4 Bottom wall 5 of outer metal fitting 6 Side wall 6 鍔 7 Mounting hole 8 Rubber elastic body 9 Bottom wall 10 of inner metal fitting 11 Side wall 11 Concavity and convexity 12 Protrusion 13 Underlay 14 Weight 15 Hole 16 Curl 17 Expanded body 18 Wedge R Overhang amount S Overhang amount

Claims (4)

  In the dynamic damper in which the inner metal fitting with the mass member attached to the outer metal fitting is held in a suspended state via a rubber elastic body, the inner metal fitting is U-shaped to form irregularities on the bottom wall. A dynamic damper characterized in that the concave and convex portions are pressed from above to cause the inner metal fitting to protrude outward in a predetermined manner, the rubber elastic body is in a required compression state, and a mass member is attached to the inner metal fitting.   In a dynamic damper in which an inner metal fitting with a mass member attached to the outer metal fitting is held in a suspended state via a rubber elastic body, the inner metal fitting is made U-shaped with the side wall folded inward, and this side wall is placed outside. The dynamic damper is characterized in that a mass member is attached to the inner metal fitting by bending the inner metal piece outwardly and extending the inner metal piece in a predetermined outward direction so that the rubber elastic body is in a required compression state.   The dynamic damper according to claim 1 or 2, wherein the upper end of the inner metal fitting is bent inward to hold the mass member from above.   4. The dynamic damper according to claim 3, wherein a protrusion is directed upward on the bottom wall of the inner metal fitting, and a mass member is fitted to the protrusion.