JPH0914341A - Dynamic damper - Google Patents

Abstract

PURPOSE: To advantageously tune a damper to an eigenvalue of a low frequency by immediately forming elastic legs for the attaching frame member by vulcanizing without making the outer size of an attaching frame member larger and fully reducing the spring constant of the elastic legs. CONSTITUTION: This damper includes an attaching frame member 1 in which both ends of a plate are bent in the same direction to make a pair of opposite stoppers 12 and the center of the plate makes a base plate 11, at least four elastic legs 2 fixed to the base plate 11 of the attaching frame member 1 and a mass member 3 elastically supported by the elastic legs 2. The mass member 3 includes a pair of supporting mass 31 which are fixed to at least two elastic legs 2 and are arranged in parallel between the pair of stoppers 12 and a mass body 32 which is fixed to the pair of supporting mass 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dynamic damper mounted on a vibration system of, for example, a vehicle body, a seat portion, a mounted device of an automobile to suppress harmful vibration due to engine vibration or the like.

[0002]

2. Description of the Related Art Conventionally, a dynamic damper has been used in a vibration system of, for example, a vehicle body of an automobile in order to suppress harmful vibration caused by engine vibration or the like. As such a dynamic damper, one having a flat plate-shaped mounting frame member, a plurality of elastic legs fixed to the mounting frame member, and a mass member elastically supported by the elastic legs is known. .

This dynamic damper is mounted by fixing a mounting frame member to a vehicle body or the like which becomes a vibration system,
The low frequency vibration generated in the vibration system is suppressed by the resonance of the mass member through the shearing deformation of the elastic legs. The resonance point of the dynamic damper in this case is basically determined by the spring constant of the elastic leg portion in the vibration direction and the mass of the mass member, and the natural vibration frequency is smaller as the spring constant is smaller and the mass is larger. Will be things.

[0004]

By the way, when the dynamic damper as described above is tuned for the purpose of suppressing low frequency vibration of 25 Hz or less, the mass of the mass member is increased and the spring of the elastic leg portion is increased. Tuning cannot be done unless the constant is made quite small. However, if the spring constant of the elastic leg portion is reduced, the elastic leg portion itself becomes smaller, and the amount of deformation at the time of shear deformation increases, which causes a problem in durability and the like. Therefore, it is effective to provide stopper portions for restricting large displacement of the mass member on both sides in the vibration direction of the mass member.

On the other hand, the elastic leg portion of the dynamic damper is usually formed by vulcanizing and molding a rubber material. At this time, the mounting frame member and the mass member are arranged in the vulcanizing mold. If the elastic leg portions are molded and vulcanized and bonded to them at the same time, the production becomes easy. However, if a pair of stoppers are provided at both ends of the mounting frame member, the elastic legs are vulcanized because the mass member is arranged inside the mounting frame member. After that, the extraction direction when extracting the middle mold incorporated in the vulcanization mold is limited. Therefore, there is a problem that the assembly structure of the vulcanization mold becomes complicated and the outer dimension of the mounting frame member becomes large because the distance between the stopper portion and the elastic leg portion must be widened.

The present invention has been devised in view of the above problems, and enables elastic leg portions to be directly formed on a mounting frame member by vulcanization molding without increasing the outer dimensions of the mounting frame member. It is an object to be solved to provide a dynamic damper that can make the spring constant of the elastic legs sufficiently small and can tune to a low frequency eigenvalue in an advantageous manner.

[0007]

In the dynamic damper of the present invention for solving the above-mentioned problems, both ends of a flat plate are bent in the same direction to form a pair of stopper parts facing each other, and a central part serves as a flat substrate. A mounting frame member, at least four elastic legs fixed to the substrate of the mounting frame member, and a mass member elastically supported by the elastic legs, and at least two mass members. A pair of support masses fixed to the elastic legs and arranged in parallel between the pair of stopper parts, and a pair of mass body parts coupled and fixed to the pair of support masses. Is.

As a preferred aspect of the present invention, the mass member is located inside the tip of the stopper portion and is arranged inside the mounting frame member.

[0009]

In the dynamic damper of the present invention, the mass member is divided into a pair of support masses and a mass body, and the pair of support masses are fixed to at least two elastic legs. Therefore, when performing vulcanization molding of the elastic legs, only the pair of support masses are arranged in the vulcanization molding die together with the mounting frame member. This makes it possible to use the space formed between the pair of support masses to assemble and remove the middle mold that is to be assembled into the vulcanization mold, and to free the vulcanization mold assembly structure. The degree will be expanded and complexity will be eliminated. Further, it is not necessary to widen the interval between the stopper portion of the mounting frame member and the elastic leg portion, and it is possible to avoid increasing the outer dimension of the mounting frame member.

Further, in the dynamic damper of the present invention, when a shocking vibration (acceleration) is input in the opposing direction of the pair of stopper portions, the pair of stopper portions provided at both ends of the mounting frame member causes the mass to move. Large displacement of the member is restricted. As a result, excessive deformation of the elastic legs is prevented and durability is improved, so that the spring constant of the elastic legs can be reduced.

Therefore, when tuning the dynamic damper, it is possible to advantageously tune the eigenvalue at low frequencies. If the mass member is arranged inside the tip of the stopper portion and arranged inside the mounting frame member, the internal space of the mounting frame member is effectively used to make the mass member compact.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of a dynamic damper according to this embodiment, and FIG. 2 is a front view thereof. The dynamic damper of this embodiment includes a mounting frame member 1 having a planar substrate 11 and a pair of stopper portions 12 formed at both ends of the substrate 11, and four mounting frame members fixed to the substrate 11 of the mounting frame member 1. Of the elastic leg portion 2 and a mass member 3 including a pair of supporting masses 31 joined to the two elastic leg portions 2 and a mass main body part 32 fixedly connected to both supporting masses 31 as main elements. There is.

The mounting frame member 1 is formed by pressing a metal plate, and is formed so as to face each other by bending the flat substrate 11 and the left and right ends of the substrate 11 in the same direction at substantially right angles. A pair of stopper portions 12, a mounting flange 13 extending from the tip of each stopper portion 12, and the substrate 1
1 has a lower stopper portion 14 formed by bending the lower side end portion of the stopper 1 in the same direction as the stopper portion 12 at a substantially right angle.
Two mounting holes 15 are formed in each mounting flange 13, and a mounting nut 16 is provided in correspondence with each mounting hole 15.
Is fixed. It should be noted that cushioning rubbers 17 and 18 formed integrally with each elastic leg portion 2 to be described later are provided on the inner surfaces of both ends of each stopper portion 12 and the lower stopper portion 14, respectively.

The elastic leg portions 2 are formed to have a predetermined hardness by vulcanizing natural rubber as a main component, and are arranged by vulcanization adhesion at the four corners of the base plate 11 of the mounting frame member 1, respectively. There is. The elastic leg portion 2 is formed by integrally vulcanization molding together with the attachment frame member 1 and a pair of support masses 31 described later, and the stopper portion 12 of the attachment frame member 1 is formed.
The distal end side of each elastic leg portion 2 is vulcanized and adhered to both ends of each of the pair of support masses 31 arranged in parallel between the two.

The mass member 3 has a pair of long plate-shaped support masses 31 arranged in parallel with a sufficient space between both stopper parts 12 of the mounting frame member 1, and both ends of the pair of support masses 31. The mass main body 32 is formed by superposing the parts and fixedly coupled by screws 33. Each support mass 31 is vulcanized and bonded to the two elastic legs 2 arranged along the stopper portion 12 of the mounting frame member 1 as described above. The mass main body 32 is formed by joining a wide metal plate whose both ends are superposed and bonded to the pair of support masses 31 and a metal plate arranged in a space between the support masses 31 by spot welding or the like. It has a two-layer structure. As a result, the mass main body portion 32 is located inside the tip end portion of the stopper portion 12 and is housed inside the mounting frame member 1 so as not to project outside the mounting flange 13. Further, the screw 33 for connecting and fixing the support mass 31 and the mass main body 32 is provided with the mass main body 3
It is attached so that the head does not protrude from 2. The mass member 2 includes a pair of support masses 31 and a mass body portion 3.
2 and the screw 33 are combined so as to have a predetermined mass.

The dynamic damper configured as described above is manufactured as follows. First, a mounting frame member 1 formed into a predetermined shape by pressing a metal plate
And a pair of support masses 31 formed in a predetermined shape are prepared. Then, the mounting frame member 1 and the pair of support masses 3
After the adhesive is applied to the surface of the elastic leg 2 to be joined to the elastic leg 2, the mounting frame member 1 is placed at a predetermined position in the vulcanization mold 5 for vulcanizing the elastic leg 2 as shown in FIG. And a pair of support masses 31 are arranged.

The vulcanization mold 5 used here is composed of a lower mold 51, an upper mold 52 and a pair of middle molds 53, and the assembly structure is simplified. That is,
In this vulcanization molding die 5, the pair of support masses 31 are arranged in parallel between the stopper portions 12 of the mounting frame member 1 at a distance, so that the space between them is used to assemble the middle die 53. It is configured to be extracted. Thereby, the cavity 55 forming the elastic leg portion 2 can be provided close to the stopper portion 12 of the mounting frame member 1, so that it is not necessary to widen the distance between both stopper portions 12.
The mounting frame member 1 is prevented from increasing in size.

Then, in this state, a rubber material is injected from the gate 56 into the cavity 55 of the vulcanization mold 5 to perform vulcanization molding. Thereby, as shown in FIGS. 4 and 5, one end is vulcanized and adhered to the predetermined position of the substrate 11 of the mounting frame member 1 and the other end is vulcanized and adhered to the support mass 31.
The individual elastic legs 2 are formed, and the buffer rubbers 17 and 18 integrally connected to the elastic legs 2 are formed on the inner surfaces of both ends of the stoppers 12 and the lower stoppers 14, respectively.

Thereafter, the molded product is taken out from the vulcanization mold 5, and the both ends of the mass main body 32 are connected and fixed to the pair of support masses 31 by the screws 33, whereby a dynamic damper as shown in FIGS. 1 and 2 is obtained. Complete. In the dynamic damper of the present embodiment manufactured as described above, the pair of stopper portions 12 of the mounting frame member 1 are positioned in the left-right direction and the lower stopper 14 is positioned below with respect to the vehicle body or the like serving as the vibration system. Mounting holes 15 of the mounting flange 13
It is attached by a mounting tool such as a bolt via. Then, the low-frequency harmful vibration generated in the vibration system due to the engine vibration or the like is transmitted through the shear deformation of the elastic leg portion 2 to the mass member 3.
Resonates, and is suppressed well. At this time, when a large vibration is input to the mass member 3, the large displacement of the mass member 3 is restricted by the stopper portions 12 provided at both ends of the mounting frame member 1, and the excessive deformation of the elastic leg portion 2 is prevented.

As described above, in the dynamic damper of this embodiment, the mass member 3 is fixed to the two elastic leg portions 2, and the pair of support masses 31 are arranged in parallel between the pair of stopper portions 12. And the mass main body 32 whose both ends are joined and fixed to the pair of support masses 31 with the screws 33, the elastic leg portion 2 can be formed without increasing the outer dimensions of the mounting frame member 1. It can be formed by vulcanization molding.

Further, the mass member 3 of this embodiment is partially disposed in the space between the support masses 31, is positioned lower than the stopper portion 12, and is disposed inside the mounting frame member 1. Since it is configured as described above, the internal space of the mounting frame member 1 can be effectively used and the dynamic damper can be made compact. Since the dynamic damper of this embodiment has the pair of stopper portions 12 facing each other at both ends of the mounting frame member 1, the large displacement of the mass member 3 is restricted to prevent the elastic leg portion 2 from being excessively deformed. Can
Thereby, the spring constant of the elastic leg portion 2 can be made sufficiently small.

Therefore, when the dynamic damper of this embodiment is tuned, it is possible to advantageously tune the eigenvalue of the low frequency. The dynamic damper of the above embodiment is configured such that two elastic legs 2 are fixed to one support mass 31, but three or more elastic legs 2 are fixed. It may be configured to.

[0023]

According to the dynamic damper of the present invention,
Since the mass member is composed of a pair of support masses fixed to at least two elastic legs and arranged in parallel between a pair of stopper parts, and a mass main body part coupled and fixed to the pair of support masses, The elastic leg portions can be directly formed on the mounting frame member by vulcanization molding without increasing the outer dimensions of the mounting frame member.

Further, since the mounting frame member has the pair of stopper portions which are bent in the same direction at both ends of the flat plate and face each other, the spring constant of the elastic leg portion can be made sufficiently small. Therefore, when the dynamic damper is tuned, it is possible to tune the eigenvalue of the low frequency in an advantageous manner. If the mass member according to the present invention is arranged at a position lower than the stopper portion and arranged inside the mounting frame member, the dynamic space can be obtained by effectively utilizing the internal space of the mounting frame member. The damper can be made compact.

[Brief description of the drawings]

FIG. 1 is a plan view of a dynamic damper according to an exemplary embodiment of the present invention.

FIG. 2 is a front view of the dynamic damper according to the embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a state of a vulcanizing mold when vulcanizing and molding the elastic leg portions of the dynamic damper according to the embodiment of the present invention.

FIG. 4 is a plan view showing a state in which the elastic leg portions of the dynamic damper according to the embodiment of the present invention are integrally molded.

FIG. 5 is a front view showing a state in which the elastic leg portions of the dynamic damper according to the embodiment of the present invention are integrally molded.

[Explanation of symbols]

1 ... Mounting frame member 2 ... Elastic leg part 3 ... Mass member
5 ... Vulcanizing mold 11 ... Substrate 12 ... Stopper part 13 ... Mounting flange 14 ... Lower stopper part 15 ... Mounting hole 16 ... Mounting nut 17, 18 ... Buffer rubber 31 ... Support mass 32 ... Mass body part 51 ... Lower mold 52 ... Upper mold 53 ... Medium mold 55 ... Cavity 56 ... Gate

Claims (2)

[Claims] 1. A mounting frame member in which both ends of a flat plate are bent in the same direction to form a pair of stopper portions facing each other, and a central portion thereof is a flat substrate, and the mounting frame member is fixed to the substrate. It comprises at least four elastic legs and a mass member elastically supported by the elastic legs, the mass member being fixed to at least two of the elastic legs and between a pair of the stopper parts. A dynamic damper comprising a pair of support masses arranged in parallel and a mass main body unit fixedly coupled to the pair of support masses. 2. The dynamic damper according to claim 1, wherein the mass member is located inside the tip of the stopper portion and is arranged inside the mounting frame member.