JP4033077B2 - Dynamic damper for suspension members - Google Patents

Description

  The present invention relates to a dynamic damper, and more particularly to a double-sided dynamic damper that elastically supports a damper mass from both sides in opposite directions via a pair of rubber elastic bodies.

In automobiles and the like, it is widely performed to attach a dynamic damper having a damper mass having a predetermined mass and a rubber elastic body to a vibrating body, that is, a vibration suppression target, and suppress the vibration.
For example, a suspension member of a vehicle has various vibration modes, and in order to suppress the vibration, a dynamic damper is conventionally attached to the suspension member.

  This dynamic damper is classified into a shearing type in which the rubber elastic body is sheared and a compression type in which the rubber elastic body is compressed, depending on the arrangement of the damper mass and the rubber elastic body with respect to the rigid support portion.

Among shear types, there are a cantilever type as shown in FIG. 10A and a double-end type as shown in FIG.
Here, the cantilever type is a form in which only one side of the damper mass 200 facing the rigid support portion 202 is connected to the support portion 202 with a rubber elastic body 204. It is disclosed in the following Patent Document 1.

  On the other hand, in the dual-support type shown in (B), the damper mass 200 is disposed between the rigid first support portion 202A and the second support portion 202B that are spaced apart from each other, and the first support portion 202A in the damper mass 200 is disposed on the first support portion 202A. One of the opposing sides is connected to the first support part 202A by the first rubber elastic body 204A, and the other side opposite to the second support part 202B on the opposite side is second supported by the second rubber elastic body 204B. This type connected to the part 202B is disclosed in, for example, Patent Document 2 and Patent Document 3 described below.

  In FIG. 10B, reference numeral 206 denotes a mounting bracket, 208 denotes a vibration body to be controlled, and in the illustrated example, the support portion 202 is integrally formed with the mounting bracket 206.

  In the case of the former cantilever type dynamic damper, a vibration mode in which the damper mass swings with respect to the support portion 202 is generated. On the other hand, in the case of the latter cantilever type dynamic damper, the damper mass is elastically supported from both sides. Therefore, there is an advantage that stable support is possible and the above-described swing vibration mode that occurs in a cantilever type dynamic damper can be avoided.

  That is, in the case of a double-end type dynamic damper, the vibration of the damper mass 200 becomes the same direction as the vibration direction of the vibrating body 208, and the vibration mode of the damper mass 200 becomes an effective vibration mode with respect to the vibration of the vibrating body 208. is there.

  However, in the case of the latter both-end supported dynamic damper, tensile strain is generated in the first and second rubber elastic bodies 204A and 204B due to the shrinkage after vulcanization of the first and second rubber elastic bodies 204A and 204B. However, there is a problem that the durable life of the rubber elastic bodies (first and second rubber elastic bodies 204A and 204B) is reduced due to the tensile strain.

  For this reason, in such a dual-support type dynamic damper, the tensile strain in the rubber elastic body is eliminated by drawing the mounting bracket after vulcanization (expanding when the damper mass is a tubular body). I am doing so.

  However, in this case, the number of manufacturing processes of the dynamic damper increases, which not only increases the cost of the dynamic damper, but also the process such as the drawing process increases the variation in the characteristics of the dynamic damper. Such a problem arises.

Utility Model Registration No. 2552801 JP-A-5-10385 Japanese Patent Laid-Open No. 11-94015

The present invention, against the background of such circumstances, it is possible to eliminate the tensile strain of the rubber elastic body due to the shrinkage of the rubber elastic body after vulcanization without adding an extra step such as drawing, the required process The purpose of the present invention is to provide a dynamic damper for a suspension member that can reduce the cost of a dynamic damper with a small number and can solve the problem that the process of drawing or the like causes variations in characteristics as a dynamic damper. It is a thing.

Thus, according to the first aspect of the present invention, the suspension member of the automobile is used as a vibration body to be controlled, and the same mounting bracket fastened and fixed to the suspension member is integrally and separated from each other in a fixed state inaccessible to each other. The damper mass is disposed between the pair of first and second rigid support portions arranged and formed, and one side of the damper mass facing the first support portion is formed by the first rubber elastic body. 1 is connected to the support portion, and the other side opposite to the second support portion is connected to the second support portion with a second rubber elastic body, and the damper mass is mutually connected to the damper mass. the first support portion located on the opposite side, the main vibration direction shear elasticity of said second through said first and second rubber elastic body by the supporting portion and their first and principally the damper mass of the second rubber elastic body state deforming In the dynamic damper for the suspension members that none to elastically support the both ends state, first rubber elastic body by shrinkage after curing a respective thickness direction of the first and second rubber elastic body, The second rubber elastic body has the first rubber elasticity in a direction perpendicular to the tension direction in which the damper mass pulls the damper mass corresponding to the first support portion and the second support portion in the opposite direction and in a direction perpendicular to the main vibration direction of the damper mass. And the second rubber elastic body are shifted from each other, and the fixing portion of the damper mass with the first rubber elastic body and the fixing portion with the second rubber elastic body are respectively connected to the first rubber elastic body and the second rubber elastic body. The position of the second rubber elastic body can be moved in the pulling direction accompanying shrinkage after vulcanization .

Effects and effects of the invention

  As described above, according to the present invention, the first rubber elastic body and the second rubber elastic body are arranged so as to be shifted from each other in the direction perpendicular to the tension direction in the double-end type dynamic damper, and the first rubber in the damper mass is arranged. Each of the adhering part with the elastic body and the adhering part with the second rubber elastic body can be moved in the tension direction of each rubber elastic body.

In the case of the conventional dual-support type dynamic damper, the first rubber elastic body and the second rubber elastic body are in a direction perpendicular to the respective pulling directions as shown in FIGS. 10B, 10A, and 10B. Therefore, when the first rubber elastic body and the second rubber elastic body contract after the vulcanization, the damper mass cannot move following the contraction. Tensile strain is generated in the first and second rubber elastic bodies.
In contrast, in the present invention, the positions of the first rubber elastic body and the second rubber elastic body are shifted, so that the first rubber elastic body and the second rubber elastic body contract in the tensile direction after vulcanization. Then, following the contraction, the fixed portion of the damper mass with respect to each rubber elastic body moves in the tension direction, and the tensile strain of each rubber elastic body can be eliminated.

  Therefore, according to the present invention, there is no need to perform special processing for eliminating the tensile strain of the rubber elastic body such as drawing after vulcanization, thereby reducing the number of manufacturing steps of the dynamic damper and reducing the cost. In addition, the problem that processing such as drawing causes variation in characteristics of the dynamic damper can be solved.

In the present invention, the first rubber elastic body, a second rubber elastic body at their tensile direction perpendicular to the direction, besides contact arranged by shifting positions mutually in the main vibration direction perpendicular to the direction of the damper mass Ku.

In this onset Ming also the first and second pair of support portions, previously formed integrally dynamic damper mounting bracket for attaching and fixing an automobile suspension member of a vibration damping target.

Next, embodiments of the present invention will be described in detail with reference to the drawings.
In FIG. 1, reference numeral 10 denotes a suspension member on the vehicle front side called a well-shaped subframe, which is connected to the body side through vibration isolating members such as member mounts at four connecting portions 12 on the outer peripheral portion.
14 is a dynamic damper for the suspension member of the present example attached to the suspension member 10, and its specific configuration is shown in FIGS.

In these drawings, 16 is a damper mass, and the dynamic damper 14 of this example suppresses the vibration of the suspension member 10 by vibrating the damper mass 16 in the vertical direction (main vibration direction) in FIG.
In this example, the mass of the damper mass 16 is about 710 g.
Further, the damper mass 16 has a flat L-shape as a whole having a first portion 16-1 extending in the left-right direction of the vehicle and a second portion 16-2 extending in the front-rear direction.

In this example, the dynamic damper 14 includes a damper mass 16, a metal rigid mounting bracket 18, and a pair of rigid support portions formed integrally with the mounting bracket 18, that is, a first support portion 26A and a second support portion 26B. And a pair of rubber elastic bodies that elastically connect the damper mass 16, that is, a first rubber elastic body 20 </ b> A and a second rubber elastic body 20 </ b> B.
Here, each of the first support portion 26A and the second support portion 26B is provided in a form in which a part of the plate constituting the mounting bracket 18 is bent upward by 90 °, that is, in a form in which it stands up substantially vertically. ing.

  Reference numeral 22 denotes a plate-like fixing portion provided in the mounting bracket 18, in which a fastening hole 24 is provided, and the entire mounting bracket 18 is fastened and fixed to the suspension member 10 by fastening bolts in these fastening holes 24. It has become.

  As shown in FIGS. 2, 3, and 4, the damper mass 16 is disposed between the first support portion 26A and the second support portion 26B, and one of the sides facing the first support portion 26A is disposed on the damper mass 16 side. The other side of the second rubber elastic body 20B that is opposite to the second support part 26B is elastically connected to the first support part 26A by the first rubber elastic body 20A, and is opposite to the second support part 26B by the second rubber elastic body 20B. It is elastically connected, and is elastically supported in a doubly supported state by the first support portion 26A and the second support portion 26B through the first rubber elastic body 20A and the second rubber elastic body 20B so as to vibrate in the vertical direction.

In this example, the damper mass 16 vibrates in the same direction while shear elastically deforming the first rubber elastic body 20A and the second rubber elastic body 20B in the vertical direction in the figure.
In this example, the first rubber elastic body 20A and the second rubber elastic body 20B are arranged at the same height as shown in FIGS.

On the other hand, as clearly shown in FIG. 4, the first rubber elastic body 20 </ b> A and the second rubber elastic body 20 </ b> B are arranged with their positions shifted in plan view.
Specifically, the first rubber elastic body 20A and the second rubber elastic body 20B are arranged with their positions shifted in the left-right direction of FIG. 1, that is, the left-right direction of the vehicle.

  More specifically, the first rubber elastic body 20A and the second rubber elastic body 20B are positioned in a direction perpendicular to the respective tensile direction (thickness direction) and perpendicular to the main vibration direction (vertical direction) of the damper mass 16. They are arranged in a shifted manner.

  One of the first rubber elastic bodies 20A is bonded and fixed to the tip surface of the second portion 16-2 of the damper mass 16 as shown in FIG. 4, and the second rubber elastic body 20B is shifted by a distance l to the first position. It is adhered and fixed to the side surface of the two portions 16-1.

In the case of the dynamic damper 14 of this example, the first rubber elastic bodies 20A and 20B can shrink without resistance in the thickness direction after vulcanization with the movement of the position of the damper mass 16.
FIG. 6 shows such a situation.

  That is, the damper mass 16 is in the position and posture indicated by the solid line immediately after the vulcanization of the first rubber elastic body 20A and the second rubber elastic body 20B, but the first rubber elastic body 20A and the second rubber elastic body 20B are subsequently contracted. When the first rubber elastic body 20A and the second rubber elastic body 20B are bonded to each other, the position of the damper mass 16 is moved or changed as shown by the broken line in FIG. 6, and the first rubber elastic body 20A, The second rubber elastic body 20B is allowed to contract.

As a result, the first rubber elastic body 20A and the second rubber elastic body 20B do not have a tensile strain due to the shrinkage after vulcanization, and the durability is lowered due to the tensile strain and the residual strain. Absent.
On the other hand, even if the damper mass 16 causes such position movement, the dynamic damper 14 of this example exhibits a good vibration reducing effect.

Figure 7 is a vibration characteristic when the vibrating (vibration in the Z-direction to ± 5 m / s ²⁾ in the Z direction indicated by an arrow shown in FIG. 9 (A) the dynamic damper 14 of this embodiment separately state (vertical direction) It is the figure which showed the measured result with the measurement result of the vibration characteristic of the conventional cantilever type dynamic damper 14A shown in FIG.

As shown in FIG. 7, the dynamic damper 14 of this example shows the same vibration suppression effect as the conventional dynamic damper 14 </ b> A.
In the conventional cantilever type dynamic damper 14A shown in FIG. 8, the mass of the damper mass 16 is 880 g, which is larger than the mass 710 g of the damper mass 16 in the dynamic damper 14 of the present embodiment.
Further, the result of FIG. 7 is a result of performing vibration measurement by the measurement method of FIG. 9 with a sensor attached to the PU point of the damper mass 16.

  As described above, according to the present example, unlike the case of the conventional dual-support type dynamic damper, the positions of the first rubber elastic body 20A and the second rubber elastic body 20B are shifted from each other. When the rubber elastic body 20A and the second rubber elastic body 20B contract in the pulling direction after vulcanization, the bonded portion of the damper mass 16 to the rubber elastic bodies 20A and 20B moves in the pulling direction following the contraction. , To eliminate the tensile strain of each rubber elastic body.

  Therefore, according to this example, it is not necessary to perform special processing for eliminating the tensile strain of the rubber elastic bodies 20A and 20B such as drawing after vulcanization, and thereby the number of manufacturing steps of the dynamic damper 14 can be reduced. The cost can be reduced, and the problem that processing such as drawing causes variation in characteristics of the dynamic damper 14 can be solved.

  Although the embodiment of the present invention has been described in detail above, this is merely an example, and the present invention can be configured in various forms without departing from the spirit of the present invention.

It is a figure shown in the state where the dynamic damper of one embodiment of the present invention was attached to the suspension member. It is a perspective view of the dynamic damper of FIG. FIG. 3 is a side view of the dynamic damper of FIGS. 1 and 2. It is sectional drawing which cut | disconnects and shows the dynamic damper of FIG. 1, FIG. 2 by the horizontal surface. FIG. 5 is a cross-sectional view taken along the line A in FIG. FIG. 3 is an operation explanatory diagram of the dynamic damper of FIGS. 1 and 2. It is the figure which showed the measurement result of the vibration characteristic of the dynamic damper with the conventional example. It is a figure of the conventional cantilever type dynamic damper. It is explanatory drawing of the measuring method of a vibration characteristic. It is a figure which shows an example of the conventional dynamic damper.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Suspension member 14 Dynamic damper 16 Damper mass 18 Mounting bracket 20A 1st rubber elastic body 20B 2nd rubber elastic body 26A 1st support part 26B 2nd support part

Claims (1)

First and second, which are integrally formed and spaced apart from each other in a fixed state inaccessible to the same mounting bracket that is fastened and fixed to the suspension member, with the suspension member of the automobile as a vibration body to be controlled . A damper mass is disposed between a pair of rigid support portions, and one side of the damper mass facing the first support portion is connected to the first support portion with a first rubber elastic body, and on the opposite side The other one of the sides opposite to the second support portion is connected to the second support portion by a second rubber elastic body, and the damper mass is located on the opposite side to the damper mass. , elastically supported by both ends state to a state in which mainly shear elastic deformation to the main vibration direction of said damper mass and their first and second rubber elastic body through the first and second elastic member by said second support portion The In the dynamic damper for the suspension members that without such,
The first support portion, the second rubber elastic body, and the second rubber elastic body corresponding to the damper mass by shrinkage after vulcanization in the thickness direction of the first and second rubber elastic bodies, respectively. The first rubber elastic body and the second rubber elastic body are shifted from each other in the direction perpendicular to the tension direction pulling in the opposite direction to the support portion and in the direction perpendicular to the main vibration direction of the damper mass, and the damper mass Each of the first rubber elastic body and the second rubber elastic body is moved in the tension direction in accordance with the shrinkage after vulcanization of the first rubber elastic body and the second rubber elastic body. A dynamic damper for a suspension member, which is made possible.

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