JP4368480B2 - Dynamic damper - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dynamic damper that is a dynamic vibration absorber that dynamically enhances vibration and sound insulation of a vehicle, and is particularly suitable for use in vibration and sound insulation of a steering wheel.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, dynamic dampers, which are various types of vibration isolator, have been used as vibration and soundproofing measures for vehicles such as automobiles. Such a dynamic damper includes a substrate to be attached to an object, a mass member having a predetermined weight, and a rubber elastic body that is vulcanized and bonded to the mass member and the substrate to provide anti-vibration support. Such a dynamic damper has a certain resonance frequency depending on the relationship between the spring characteristics of the rubber member and the weight of the mass member, and exhibits a vibration and soundproofing effect near this resonance frequency.
[0003]
[Problems to be solved by the invention]
The dynamic damper as described above has a target frequency at the design stage. As a special case, strict product accuracy may be required for the frequency. In such a case, it is necessary to inspect all the products and to cut the mass member and to manage the rubber material with high accuracy so that the desired frequency characteristics can be obtained. Therefore, there is a problem that it takes time and effort for manufacturing and increases the product cost.
[0004]
In view of such circumstances, an object of the present invention is to provide a dynamic damper that can more easily obtain a desired frequency characteristic.
[0005]
[Means for Solving the Problems]
According to a first aspect of the present invention for solving the above problems, a substrate attached to a target object, a mass member having a predetermined weight, and a connection between the substrate and the mass member are used to connect the mass member. A dynamic damper comprising a rubber-like elastic body supported on the substrate, wherein the rubber-like elastic body includes a plurality of rubber members that connect and support the substrate and the mass member, and the mass member. consists of a adjusting rubber-like elastic body provided between the mass member and the substrate with provided in the central portion, the adjusting rubber elastic give desired compressive force to the adjusting rubber- The dynamic damper includes an adjusting means for adjusting a spring constant of the body.
[0006]
According to a second aspect of the present invention, in the dynamic damper according to the first aspect, the adjusting means adjusts and fixes a maximum separation distance between the substrate and the mass member.
[0007]
According to a third aspect of the present invention, in the first or second aspect, at least a part of the rubber elastic body for adjustment is held while being sandwiched between the substrate and the mass member, The adjusting means is a dynamic damper that applies a desired compressive force to the rubber elastic body for adjustment by adjusting a maximum separation distance between the substrate and the mass member.
[0008]
According to a fourth aspect of the present invention, in the third aspect, the adjusting means is fastened to a screw member that penetrates the rubber elastic body for adjustment, the substrate, and the mass member, and a tip of the screw member. The dynamic damper is characterized by comprising a nut member.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in more detail with reference to embodiments.
[0010]
A structure of a dynamic damper according to an embodiment of the present invention will be described with reference to FIGS. This dynamic damper is incorporated in the steering of an automobile and exhibits an anti-vibration / soundproof effect. FIG. 1 is a perspective view and FIG. 2 is a cross-sectional view.
[0011]
As shown in both drawings, the dynamic damper 10 includes a substrate 11, a mass member 12, and four rubber members 13 that connect them. The substrate 11 includes a screw hole 11a for attaching to the object, and includes a convex portion 11b that protrudes in a bent state toward the mass member 12 at the center. Two rubber members 13 are arranged on both sides so as to sandwich the convex portion 11b, and are provided in a state of being vulcanized and bonded to the substrate 11 and the mass member 12.
[0012]
On the other hand, a concave portion 12a is formed on the upper and lower surfaces of the central portion of the mass member 12, a through hole 12b is provided in the concave portion 12a, and an adjustment rubber member 14 is fitted in the through hole 12b. The adjustment rubber member 14 has a through hole 14a, and is fastened to the substrate 11 by an adjustment screw 15 and a nut 16 that pass through the through hole 14a and the corresponding through hole 11c provided in the substrate 11. .
[0013]
In such a dynamic damper 10, the resonance frequency is determined by the four rubber members 13, the adjustment rubber member 14, and the weight of the mass member 12. This frequency characteristic can be finely adjusted by adjusting the compression load applied to the adjusting rubber member 14 by the adjusting screw 15 and the nut 16.
[0014]
Therefore, in such a dynamic damper 10, even if the actual frequency characteristic deviates from the design value due to the deviation of the rubber physical property of the rubber member 13, by adjusting the compression load to the adjustment rubber member 14 by the adjustment screw 15, For example, the resonance frequency can be adjusted to increase.
[0015]
In the above-described embodiment, the adjustment rubber member 14 is provided around the adjustment screw 15 for adjusting the frequency characteristic by adjusting the maximum separation distance between the mass member 12 and the substrate 11, so that vibration occurs. Sound generated at the boundary between the adjusting screw 15, the substrate 11, and the mass member 12 can be prevented.
[0016]
Further, the adjustment rubber member 14 is provided so as to fit into the through hole 12b of the mass member 12, but is not limited thereto, and may be provided so as to be vulcanized and bonded to either the substrate 11 or the mass member 12. it can.
[0017]
【The invention's effect】
As described above, according to the present invention, it is possible to easily adjust the frequency characteristics after manufacturing the product, and thus it is possible to provide a dynamic damper that can obtain the target frequency characteristics more easily than in the past.
[Brief description of the drawings]
FIG. 1 is a perspective view of a dynamic damper of the present invention.
FIG. 2 is a cross-sectional view of a dynamic damper according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Dynamic damper 11 Board | substrate 12 Mass member 13 Rubber member 14 Adjustment rubber member 15 Adjustment screw 16 Nut

Claims (4)

A substrate attached to the object; a mass member having a predetermined weight; and a rubber-like elastic body that connects the substrate and the mass member to support the mass member on the substrate. A dynamic damper, wherein the rubber-like elastic body is provided at a central portion of the mass member, connected to and supports the substrate and the mass member, and between the substrate and the mass member. An adjustment rubber-like elastic body provided between the adjustment rubber-like elastic bodies, and adjusting means for adjusting a spring constant of the adjustment-like rubber-like elastic body by applying a desired compressive force to the adjustment rubber-like elastic body. Dynamic damper characterized by   The dynamic damper according to claim 1, wherein the adjustment unit adjusts and fixes a maximum separation distance between the substrate and the mass member.   3. The adjustment rubber-like elastic body according to claim 1, wherein at least a part of the rubber elastic body for adjustment is held in a state of being sandwiched between the substrate and the mass member, while the adjustment means includes the substrate and the mass member. A dynamic damper characterized in that a desired compression force is applied to the rubber elastic body for adjustment by adjusting the maximum separation distance.   4. The adjustment means according to claim 3, wherein the adjustment means includes a screw member that penetrates the adjustment rubber-like elastic body, the substrate, and the mass member, and a nut member that is fastened to a tip of the screw member. Dynamic damper.

Images