JP2016102551A - Dynamic damper fitting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To properly fit first and second dynamic dampers having different rubber hardnesses to a desired member, without using another member such as a band.SOLUTION: A dynamic damper fitting structure C includes first and second dynamic dampers D1, D2 externally fitted to a vibration-proof object member 4 of a vehicle so as to align to each other. The first dynamic damper D1 has smaller hardness of rubbers (1A, 1B) than that of the second dynamic damper D2. At one of side surface parts 14a, 14b of the rubbers 1A, 1B, a projection part 11 is provided, and at the other one, a recess part 12 is provided. By fitting the projection part 11 and the recess part 12, the first and second dynamic dampers D1, D2 are connected.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a dynamic damper mounting structure used for reducing vibration and noise of a drive shaft of a vehicle such as an automobile or other desired portions.

  As described in Patent Document 1, as a dynamic damper mounting structure, there is a structure in which a dynamic damper is mounted on a drive shaft for the purpose of suppressing vibration of the drive shaft of the vehicle and noise caused by the vibration. When such a structure is employed, not only one dynamic damper but also two dynamic dampers are used to further enhance the vibration and noise suppression effect.

FIG. 3 shows an example of such means.
In the figure, first and second dynamic dampers D1 ′ and D2 ′ are attached to the drive shaft 4 of the vehicle so as to be close to each other and aligned. The first and second dynamic dampers D1 ′ and D2 ′ respectively include cylindrical rubbers 1A and 1B, and damping mass members 2A and 2B embedded and held therein. However, the mass member 2A has a smaller mass than the mass member 2B. The rubber 1A has a lower hardness and a larger spring constant than the rubber 1B. As a result, the vibration suppression frequency bands (noise reduction frequency bands) of the first and second dynamic dampers D1 ′ and D2 ′ are different, and a case where only one dynamic damper is used. In comparison, noise can be reduced in a wide frequency band.

  Conventionally, as a means for attaching the first and second dynamic dampers D1 ′ and D2 ′ to the drive shaft 4, the second dynamic damper D2 ′ has, for example, a rubber 1B and a drive shaft 4 in a press-fit state. A means for fitting is used. On the other hand, for the first dynamic damper D1 ', a means for fixing the rubber 1A to the drive shaft 4 by using the band 9 is employed. This is because the rubber 1A is relatively soft, and it is difficult to accurately fix the rubber 1A only by using the press-fitting means.

However, the prior art has the following problems.
That is, since it is necessary to use the band 9 as means for fixing and attaching the first dynamic damper D1 ′, the cost of the band 9 increases, which is disadvantageous in terms of cost. Further, the first dynamic damper D1 ′ needs to be provided with a relatively wide portion for mounting the band 9. Therefore, the size of the first dynamic damper D1 ′ is also increased.

JP 2011-185411 A

  The present invention has been conceived under the circumstances as described above, and without using a separate member such as a band, the first and second dynamic dampers having different rubber hardnesses are used for damping a vehicle. An object of the present invention is to provide a dynamic damper mounting structure that can be appropriately mounted on a target member.

  In order to solve the above problems, the present invention takes the following technical means.

  The dynamic damper mounting structure provided by the present invention includes a cylindrical rubber that embeds and holds a damping mass member, and is attached by being fitted on a damping target member of a vehicle so as to be aligned with each other. 1 and a second dynamic damper, wherein the first dynamic damper is a dynamic damper mounting structure in which the hardness of the rubber is lower than that of the second dynamic damper. Of each of the rubbers of the second dynamic damper, one of the two side parts facing each other is provided with a convex part, and the other is provided with a concave part. These convex part and concave part are The first and second dynamic dampers are connected with each other by fitting.

According to such a configuration, the following effects can be obtained.
That is, of the first and second dynamic dampers, the first dynamic damper having a low rubber hardness is connected to the second dynamic damper having a high rubber hardness. If it fixes to a damping object member using a press fit fitting means etc., fixation of the 1st dynamic damper will also be aimed at appropriately in connection with this. Therefore, unlike the prior art, it is not necessary to use a separate part such as a rubber fastening band as the fixing means of the first dynamic damper. As a result, the manufacturing cost can be reduced.
As means for connecting the first and second dynamic dampers, means for providing a convex part and a concave part on the two side parts facing each other of these rubbers and fitting them together is used. Therefore, the overall width of the first and second dynamic dampers can be prevented from increasing. Of course, unlike the prior art, it is not necessary to provide a portion for attaching the band. Therefore, the overall size can be reduced. Furthermore, according to the present invention, since the first and second dynamic dampers are in contact with each other, they can be positioned easily.

  Other features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention with reference to the accompanying drawings.

(A) is a partially omitted sectional view showing an example of a dynamic damper mounting structure according to the present invention, (b) is an enlarged sectional view of a main part of (a), and (c) is (b). It is Ic-Ic sectional drawing of. FIG. 3 is a perspective view of first and second dynamic dampers shown in FIG. 1. It is principal part sectional drawing which shows an example of a prior art.

Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.
In the following description, the same reference numerals as those in the prior art are used for the same or similar elements as those in the prior art shown in FIG.

A dynamic damper mounting structure C shown in FIG. 1 is a structure in which first and second dynamic dampers D1 and D2 are mounted on a drive shaft 4 of a vehicle.
The drive shaft 4 is used, for example, in an independent suspension type front wheel drive vehicle. One end 4a is connected to a differential gear (not shown) via, for example, a universal joint 50a, and the other end 4b is connected to a universal joint. It is connected to driving wheels (not shown) via 50b. The universal joints 50a and 50b are covered with boots 51a and 51b.

  The first and second dynamic dampers D1 and D2 include substantially cylindrical rubbers 1A and 1B and metal and cylindrical damping mass members 2A and 2B embedded and held in the rubbers 1A and 1B. Yes. Similar to the relationship between the first and second dynamic dampers D1 'and D2' of the prior art, the mass member 2A has a smaller mass than the mass member 2B. The rubber 1A has a lower hardness and a larger spring constant than the rubber 1B. The first dynamic damper D1 is effective in reducing the noise caused by the vehicle traveling at high speed, and the second dynamic damper D2 is effective in reducing the gear noise of the differential gear.

  Both the first and second dynamic dampers D1 and D2 are externally fitted to the drive shaft 4, but the second dynamic damper D2 is fixed to the drive shaft 4 using press-fitting fitting means. Yes. Since the rubber 1B is hard, the second dynamic damper D2 can be appropriately fixed to the drive shaft 4 by adopting the press-fitting fitting means.

  On the other hand, the following means is adopted as a fixing means for the first dynamic damper D1. That is, a convex portion 11 that protrudes toward the rubber 1B is provided on the side surface portion 10a of the rubber 1A, and a concave portion 12 into which the convex portion 11 is press-fitted is provided on the side surface portion 10b of the rubber 1B. . The first dynamic damper D1 is connected to and fixed to the second dynamic damper D2 by fitting (press-fit fitting) between the convex portion 11 and the concave portion 12. Contrary to this embodiment, a configuration in which the concave portion 12 is formed on the rubber 1A side and the convex portion 11 is formed on the rubber 1B side may be employed.

  Preferably, as shown in FIG. 2, the convex portion 11 has a spline shape having a plurality of rib-shaped convex portions 13a on its outer peripheral surface, and the concave portion 12 has a plurality of concave grooves 13b on its inner peripheral surface. The rib-like convex portion 13a and the concave groove 13b are configured to fit with each other. According to such a configuration, the relative rotation of the rubbers 1A and 1B can be accurately prevented, and the contact area between the outer peripheral surface of the convex portion 11 and the inner peripheral surface of the concave portion 12 can be increased. it can. Therefore, the fixed connection state between the first and second dynamic dampers D1, D2 can be made more reliable and strong. More preferably, the rib-like convex portion 13a and the concave groove 13b are formed in an inclined shape having a twist angle with respect to the axial length direction of the rubber 1A, 1B. According to such a configuration, the fixed connection state between the first and second dynamic dampers D1 and D2 can be further reliably and strengthened.

  Next, the operation of the dynamic damper mounting structure C described above will be described.

  First, the second dynamic damper D2 is in a state in which the drive shaft 4 is press-fitted into the hole of the hard rubber 1B, so that the second dynamic damper D2 is securely and firmly fixed to the drive shaft 4. On the other hand, the first dynamic damper D1 is connected and fixed to the second dynamic damper D2 by fitting the convex portion 11 and the concave portion 12 together. For this reason, although the rubber 1A of the first dynamic damper D1 is relatively soft and the first dynamic damper D1 alone is difficult to properly fix to the drive shaft 4, this embodiment is implemented. According to the embodiment, the first dynamic damper D1 can be appropriately fixed in the form of using the second dynamic damper D2.

As a result, it is not necessary to use a separate part such as a rubber fastening band as a fixing means for the first dynamic damper D1. As a result, the manufacturing cost can be reduced. Further, as the connecting and fixing means for the first and second dynamic dampers D1 and D2, the convex portions 11 and the concave portions 12 provided on the two side surfaces 14a and 14b facing each other of the rubber 1A and 1B are fitted. Therefore, the total width of the first and second dynamic dampers D1 and D2 can be prevented from being increased, and the overall size can be reduced. Furthermore, since the first and second dynamic dampers D1 and D2 are arranged in contact with each other, it is easy to position them.

  The present invention is not limited to the contents of the above-described embodiment. The specific configuration of each part of the dynamic damper mounting structure according to the present invention can be varied in design in various ways within the intended scope of the present invention.

As a means for fixing the second dynamic damper D2 to the drive shaft 4, press-fitting means is simple, but is not limited thereto. The main point of the present invention is to appropriately attach the first dynamic damper D1 having the relatively soft rubber 1A, and a specific fixing means for the second dynamic damper D2 is not limited. In the case where it is not necessary to remove the second dynamic damper D2, it is possible to employ, for example, means for adhering the rubber 1B to the drive shaft 4 using an adhesive or the like as the fixing means.
The first dynamic damper D1 is connected to the second dynamic damper D2 in a state in which the convex portion 11 and the concave portion 12 provided in the first and second dynamic dampers D1 and D2 are fitted. The specific shapes and sizes of the convex portion 11 and the concave portion 12 are not limited.
The vibration suppression target part to which the first and second dynamic dampers are attached is not limited to the drive shaft. Various parts of a vehicle component device such as a rotating shaft other than the drive shaft and a suspension member can be set as vibration suppression target parts.

C Dynamic damper mounting structure D1, D2 First and second dynamic dampers 1A, 1B Rubber 10a, 10b Side surfaces (of rubber)
11 Convex part 12 Concave part 2A, 2B Mass member 4 Drive shaft (vibration control object part)

Claims (1)

The first and second dynamic dampers have a cylindrical rubber that embeds and holds the damping mass member, and are fitted to the damping target member of the vehicle so as to be aligned with each other.
The first dynamic damper is a dynamic damper mounting structure in which the hardness of the rubber is lower than that of the second dynamic damper,
Of the respective rubbers of the first and second dynamic dampers, one of the two side parts facing each other is provided with a convex part, and the other is provided with a concave part. These convex parts The dynamic damper mounting structure is characterized in that the first and second dynamic dampers are connected by fitting with a concave portion.

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