JP3913125B2 - Manufacturing method of dynamic damper - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
According to the present invention, a pair of side walls of a damper mass are separately connected to a pair of opposing support wall portions provided on the support bracket via rubber-like elastic bodies, and the damper mass and a support bracket portion between the both support wall portions The present invention relates to a method for manufacturing a dynamic damper in which a damper is provided with a mechanism for preventing a damper mass from falling off .
[0002]
[Prior art]
The body of an automobile has natural frequencies in various frequency ranges, and when this causes a resonance phenomenon, the amount of vibration transmitted to the body increases and the ride comfort becomes worse. Therefore, the above-mentioned problem is avoided by reducing vibration in a predetermined frequency range with a dynamic damper.
[0003]
Conventionally, the damper mass of the above-mentioned dynamic damper is composed of one thick square block material made of metal, and the drop-off prevention mechanism has a pin with a head in the through hole formed in the support bracket portion opposite to the square block material. The pin was inserted from the side, inserted into a mounting hole formed in the square block material, and fixed by welding.
[0004]
[Problems to be solved by the invention]
According to the above-described conventional configuration, the damper mass has to be formed by cutting out from a thick plate material, and it has been troublesome to cut out the damper mass.
Also, the drop-off prevention mechanism inserts a pin with a head into the through hole formed in the support bracket part from the opposite side of the square block material, and inserts the pin into the mounting hole formed in the square block material and welds it firmly. Therefore, a process for machining mounting holes in the square block material is necessary, and the number of processes is large.
As a result, the manufacturing cost was high and there was room for improvement.
[0005]
The present invention has been made in view of the above circumstances, and an object thereof is to provide a dynamic damper capable of reducing the manufacturing cost.
[0006]
[Means for Solving the Problems]
The structure of the invention according to claim 1 is:
A pair of side walls of the damper mass are individually connected to a pair of support wall portions provided on the support bracket via rubber elastic bodies, and the damper mass is dropped across the damper mass and the support bracket portion between the two support wall portions. A dynamic damper manufacturing method for manufacturing a dynamic damper by providing a prevention mechanism ,
A plurality of plate materials are polymerized to form the damper mass,
Process for forming the damper mass consists of a single plate of the plurality of plate members, a polymerization unit for the rest of the plate material is polymerized, a projection projecting to the support bracket portion side from the overlapping portion A first punching process for forming a single plate;
A second punching step of forming each plate material into a single plate,
A polymerization step of polymerizing each plate material and a polymerization portion of the one plate material,
A pair of U-shaped cross sections covering the pair of support wall portions of the support bracket and the side wall portions of the plurality of plate members by bending both ends of the pair of support wall portions and the support bracket portion in the back direction by 90 degrees. The rubber-like elastic body is vulcanized and bonded to a cover using a mold, and the pair of support walls and a pair of U-shaped covers are connected,
The protruding portion is inserted through a through hole formed in the support bracket portion, and a retaining member is fixed to the protruding portion to constitute the drop-off prevention mechanism ,
A frequency range of vibration to be reduced is determined by the weight of the rubber-like elastic body, the damper mass, and the weight of the retaining member, and a plurality of weights of the retaining member that are the same and different from each other. The dynamic damper is produced using a mold having the same size .
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a dynamic damper attached to a suspension member of an automobile. This dynamic damper is in a state of rising from the suspension member, and in that state, vibrations in a predetermined frequency range are reduced to prevent problems such as poor ride comfort of the automobile.
[0008]
The structure will be described. As shown in FIGS. 2 to 5, a pair of damper masses 4 is formed on a pair of first side walls 3 (corresponding to support walls) facing each other of a substantially U-shaped support bracket 2. The second side wall 5 is connected to each other via a rubber-like elastic body 6, and a damper mass drop-off prevention mechanism 8 is provided across the damper mass 4 and the upper wall 7 (corresponding to the support bracket portion) between the first side walls 3. .
[0009]
The support bracket 2 is made of sheet metal, and the lower end side of the first side wall 3 is folded outward, and a bolt insertion hole 13 through which a connecting bolt for the suspension member is inserted is formed in the folded portion 17. Moreover, the width direction both ends of the 1st side wall 3 and the upper wall 7 are bend | folded 90 degree | times to the back side so that the 1st side wall 3 and the upper wall 7 may become a structure strong against an external force.
[0010]
The damper mass 4 is formed by superposing five metal plates 10 (corresponding to plate materials). Specifically, both side walls of the five metal plates 10 are covered with a pair of U-shaped covers 11. In this state, the upper surface portion on one side and the lower surface portion on the other side are welded and fixed across the center in the width direction of the metal plate 10, and the plate surface of the outermost metal plate 10 and the end portion of the cover 11 are fixed by welding. It is. The weld metal for fixing the five metal plates 10 to each other is included in the weld groove 12 formed in a row on the upper surface portion and the lower surface portion (see FIG. 4).
[0011]
Of the five metal plates 10, the four metal plates 10 are composed of only a rectangular overlap portion where the other metal plates 10 overlap, but the remaining one metal plate 10 positioned at the center is the other metal plate. It comprises a superposed part where the plate 10 is superposed and a projecting part 14 projecting from the superposed part to the upper wall 7 side. And this protrusion part 14 is inserted in the square through-hole 15 formed in the center of the upper wall 7, The metal retaining plate 16 (equivalent to a retaining member) is formed in the step part formed in the front end side of the protrusion part 14. The square hole portion formed in (1) is externally fitted and welded.
[0012]
This structure, that is, a structure in which the central metal plate 10 is formed from the overlapping portion and the protruding portion 14, the protruding portion 14 is inserted into the through hole of the upper wall 7, and the retaining plate 16 is fixed to the protruding portion 14 by welding. The damper mass drop-off prevention mechanism 8 is configured. Thereby, even if the rubber-like elastic body 6 is broken, the retaining plate 16 is engaged with the upper wall 7 of the support bracket 2 to prevent the damper mass 4 from dropping on the road surface while the vehicle is running. Can do.
[0013]
The five metal plates 10 are formed by punching (the metal plate 10 positioned at the center is punched so that the overlapping portion and the protruding portion 14 are integrated).
Therefore, even when a large number of metal plates 10 are formed, each metal plate 10 can be formed in a short time.
[0014]
The retaining plate 16 is set to have substantially the same size and shape as the shape of the cross section of the damper mass 4, and the whole is overlapped with the damper mass 4 in plan view.
[0015]
Both the first side walls 3 of the support bracket 2 and the second side walls 5 of the damper mass 4 supply the rubber compound to the cavity and vulcanize it while the support bracket 2 and the damper mass 4 are accommodated in the mold. Glue and connect. And after this vulcanization adhesion, the retaining plate 16 is welded and fixed to the protruding portion 14.
[0016]
[Another embodiment]
In the above embodiment, the retaining member is formed in a plate shape. However, the retaining member is not limited to a plate shape, and may be a square block shape, for example.
The number of the metal plates 10 is not limited to the number of the above embodiments.
The present invention can also be applied to members other than suspension members of automobiles and dynamic dampers assembled to automobile parts other than members.
[0017]
【The invention's effect】
According to the configuration of the first aspect, when forming the damper mass, for example, a predetermined plate material among a plurality of plate materials is punched so that the overlapping portion and the projecting portion are integrated, and other plate materials are also formed. It only needs to be formed by stamping and welding them together. As a result, the damper mass can be formed in a shorter time than the conventional configuration in which the damper mass is cut out from a thick plate material, which is advantageous for mass production.
[0018]
Like the conventional technology, the fall prevention mechanism is configured by inserting a pin with a head through the through hole formed in the support bracket, inserting the pin into the mounting hole formed in the square block material, and fixing it by welding. In this case, the number of steps is increased because a process for machining the pin mounting holes in the square block material is required. In the configuration of claim 1, the drop-off prevention mechanism is a polymerization in which a predetermined plate material is polymerized by another plate material. And a protruding portion protruding from the overlapping portion to the support bracket portion side, the protruding portion is inserted into a through hole formed in the support bracket portion, and a retaining member is fixed to the protruding portion. As a result, the above-described drilling step is not necessary, and the number of steps can be reduced.
[0019]
The frequency range corresponding to the dynamic damper can be determined by the weight of the retaining member fixed to the damper mass. For example, when the manufactured dynamic damper does not accurately correspond to the desired frequency range, From the dynamic damper to be manufactured, it is possible to take measures such as fixing a retaining member having a different weight to the damper mass having the same weight as the damper mass of the previously manufactured dynamic damper so as to accurately correspond to a desired frequency range. It becomes like this.
[0020]
It is also possible to produce a plurality of dynamic dampers having the same weight of the damper mass and different weights of the retaining members so that each dynamic damper corresponds to a different frequency range.
[0021]
By the way, when connecting the support wall portion of the support bracket and the side wall of the damper mass via a rubber-like elastic body, the rubber compound is supplied to the cavity and supported while the support bracket and the damper mass are accommodated in the mold. Vulcanized and bonded to walls, etc. For example, if the means to change the weight of the damper mass is taken to make the dynamic damper correspond to the desired frequency range, the mold size must be changed, etc. There is a problem that the process is time-consuming. On the other hand, according to the configuration of the first aspect, since the means for forming the dynamic damper by changing the weight of the retaining member can be taken, the above problem can be solved.
[0022]
Therefore, a dynamic damper capable of reducing the manufacturing cost can be provided.
[Brief description of the drawings]
[Fig. 1] Front view of dynamic damper [Fig. 2] Plan view of dynamic damper [Fig. 3] Plan view of damper mass [Fig. 4] Front view of damper mass [Fig. 5] Side view of damper mass [Explanation of symbols]
2 Support bracket 3 Support wall portion 4 Damper mass 5 Side wall 6 Rubber elastic body 7 Support bracket portion 8 Damper mass drop-off prevention mechanism 10 Plate member 14 Protruding portion 15 Through hole 16 Retaining member

Claims (1)

A pair of side walls of the damper mass are individually connected to a pair of support wall portions provided on the support bracket via rubber elastic bodies, and the damper mass is dropped across the damper mass and the support bracket portion between the two support wall portions. A dynamic damper manufacturing method for manufacturing a dynamic damper by providing a prevention mechanism ,
A plurality of plate materials are polymerized to form the damper mass,
Process for forming the damper mass consists of a single plate of the plurality of plate members, a polymerization unit for the rest of the plate material is polymerized, a projection projecting to the support bracket portion side from the overlapping portion A first punching process for forming a single plate;
A second punching step of forming each plate material into a single plate,
A polymerization step of polymerizing each plate material and a polymerization portion of the one plate material,
A pair of U-shaped cross sections covering the pair of support wall portions of the support bracket and the side wall portions of the plurality of plate members by bending both ends of the pair of support wall portions and the support bracket portion in the back direction by 90 degrees. The rubber-like elastic body is vulcanized and bonded to a cover using a mold, and the pair of support walls and a pair of U-shaped covers are connected,
The protruding portion is inserted through a through hole formed in the support bracket portion, and a retaining member is fixed to the protruding portion to constitute the drop-off prevention mechanism ,
A frequency range of vibration to be reduced is determined by the weight of the rubber-like elastic body, the damper mass, and the weight of the retaining member, and a plurality of weights of the retaining member that are the same and different from each other. A method for manufacturing a dynamic damper, in which a dynamic damper is manufactured using a mold having the same size.

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