JPH0979315A - Dynamic damper - Google Patents
Dynamic damperInfo
- Publication number
- JPH0979315A JPH0979315A JP25585295A JP25585295A JPH0979315A JP H0979315 A JPH0979315 A JP H0979315A JP 25585295 A JP25585295 A JP 25585295A JP 25585295 A JP25585295 A JP 25585295A JP H0979315 A JPH0979315 A JP H0979315A
- Authority
- JP
- Japan
- Prior art keywords
- mass body
- bracket
- peripheral surface
- elastic member
- inner peripheral
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Landscapes
- Vibration Prevention Devices (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、防振技術に属する
ものであって、自動車の車体等、所要の箇所に取り付け
られるダイナミックダンパに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping technique, and relates to a dynamic damper that is attached to a required place such as a car body.
【０００２】[0002]
【従来の技術】自動車の車体等特定箇所に取り付けら
れ、特定周波数域の振動を低減するダイナミックダンパ
の典型的な従来例が、例えば実公平３−２６３３９号公
報に開示されている。このダイナミックダンパは、図３
に示すように、振動を低減すべき対象である車体等に取
り付けられる取付側部材ａと、これに対向配置された質
量体取付金具ｂとをゴム系の弾性部材ｃを介して連結
し、質量体取付金具ｂにボルト・ナットｅによって質量
体ｄを取り付けた構造を有する。2. Description of the Related Art A typical conventional example of a dynamic damper attached to a specific location such as a vehicle body of an automobile to reduce vibration in a specific frequency range is disclosed in, for example, Japanese Utility Model Publication No. 3-26339. This dynamic damper is shown in Fig. 3.
As shown in FIG. 3, a mounting side member a to be mounted on a vehicle body or the like whose vibration is to be reduced and a mass body mounting bracket b opposed thereto are connected via a rubber-based elastic member c, It has a structure in which a mass body d is attached to a body mounting bracket b by a bolt / nut e.
【０００３】[0003]
【発明が解決しようとする課題】上記従来のダイナミッ
クダンパは、例えば取付側部材ａを略水平な部分の下面
又は略垂直な部分の側面に取り付けられ、弾性部材ｃと
質量体ｄ等からなる共振系が、特定周波数域の振動入力
に共振することによって動的吸振効果を奏するものであ
るが、次のような問題が指摘される。 (1) 質量体ｄの重量によって、弾性部材ｃが常に引っ張
り荷重を受けることになり、しかも、振動入力によって
質量体ｄが大きく振動変位されると、弾性部材ｃが過大
な繰り返し引っ張り変形を受けることになるため、その
耐久性に問題がある。 (2) 万一前記弾性部材ｃに破断を生じた場合、この弾性
部材ｃが質量体取付金具ｂと共に脱落してしまう。In the conventional dynamic damper described above, for example, the mounting side member a is mounted on the lower surface of the substantially horizontal portion or the side surface of the substantially vertical portion, and is composed of the elastic member c and the mass body d. The system has a dynamic vibration absorbing effect by resonating with a vibration input in a specific frequency range, but the following problems are pointed out. (1) Due to the weight of the mass body d, the elastic member c is always subjected to a tensile load, and when the mass body d is largely displaced by vibration, the elastic member c is repeatedly subjected to excessive tensile deformation. Therefore, there is a problem in its durability. (2) Should the elastic member c break, the elastic member c will fall out together with the mass body mounting bracket b.
【０００４】本発明は、上記のような事情のもとになさ
れたもので、その主な技術的課題とするところは、弾性
部材の耐久性を向上させ、かつ弾性部材の破損による質
量体の脱落を確実に防止することにある。The present invention has been made under the above circumstances, and its main technical problems are to improve the durability of the elastic member and to prevent the mass body from being damaged by the damage of the elastic member. It is to prevent the dropout.
【０００５】[0005]
【課題を解決するための手段】上述した技術的課題は、
本発明によって有効に解決することができる。すなわち
本発明に係るダイナミックダンパは、一端中央の取付部
及びこの取付部からテーパ筒状に展開した展開部を有す
るブラケットの前記展開部の外周側に、内周面が前記ブ
ラケットの外周面と対応した形状の環状の質量体が配置
され、前記展開部の外周面と質量体の内周面がゴム状弾
性材料からなる弾性部材を介して互いに連結され、前記
ブラケットの前記取付部と反対側の端部の外径が、前記
質量体の内周面の小径側の内径よりも大径となっている
ものである。The above-mentioned technical problems are as follows.
The present invention can effectively solve the problem. That is, in the dynamic damper according to the present invention, the inner peripheral surface corresponds to the outer peripheral surface of the bracket on the outer peripheral side of the developing portion of the bracket having the mounting portion at the center of one end and the developing portion expanded from the mounting portion into a tapered tubular shape. A ring-shaped mass body having a shape is arranged, the outer peripheral surface of the developed portion and the inner peripheral surface of the mass body are connected to each other via an elastic member made of a rubber-like elastic material, and the bracket is provided on the opposite side of the mounting portion. The outer diameter of the end portion is larger than the inner diameter of the inner peripheral surface of the mass body on the smaller diameter side.
【０００６】ブラケットは、その一端中央の取付部にお
いて、自動車の車体等、振動を低減すべき対象に取り付
けられ、典型的にはこの振動低減対象部材の下面に下垂
された状態に取り付けられるもので、弾性部材及び質量
体によって、低減すべき振動の周波数域に合わせて適当
な共振周波数が与えられる。すなわちブラケットの展開
部の外周の弾性部材及び質量体からなる共振系が、ブラ
ケットを介して入力される特定周波数域の振動と逆の位
相で共振することによって、動的吸振効果を発揮する。The bracket is attached to an object whose vibration is to be reduced, such as a vehicle body of an automobile, at an attachment portion at the center of one end of the bracket, and is typically attached to the lower surface of the member whose vibration is to be reduced in a hanging state. The elastic member and the mass body provide an appropriate resonance frequency according to the frequency range of vibration to be reduced. That is, the resonance system composed of the elastic member and the mass body on the outer circumference of the expansion portion of the bracket resonates in a phase opposite to the vibration in the specific frequency range input via the bracket, thereby exerting a dynamic vibration absorbing effect.
【０００７】ブラケットの展開部は、前記取付部から外
径側へテーパ筒状に展開した形状を呈するものであっ
て、その取付部と反対側の端部の外径が質量体の小径側
の端部よりも大径であるため、前記取付部が上側となる
ように取り付けられた場合であっても、質量体は弾性部
材を介して展開部の外周面上に支持された状態になり、
質量体の重量あるいは振動変位による荷重は、弾性部材
の圧縮及び剪断方向に作用するため、引っ張りによる弾
性部材の耐久性低下が防止される。また、何らかの理由
によって弾性部材が万一破断した場合でも、質量体は、
ブラケットの大径側の端部とこのブラケットが取り付け
られた振動低減対象部材との間に保持されるので、脱落
することがない。The expansion portion of the bracket has a shape expanded from the mounting portion to the outer diameter side in a tapered cylindrical shape, and the outer diameter of the end opposite to the mounting portion is the smaller diameter side of the mass body. Since the diameter is larger than the end portion, even when the attachment portion is attached so as to be on the upper side, the mass body is in a state of being supported on the outer peripheral surface of the expansion portion via the elastic member,
Since the weight of the mass body or the load due to the vibration displacement acts in the compression and shearing directions of the elastic member, the durability of the elastic member is prevented from lowering due to the tension. In addition, even if the elastic member breaks for some reason, the mass body
Since it is held between the large-diameter end of the bracket and the vibration reduction target member to which the bracket is attached, it does not fall off.
【０００８】本発明の一層好ましい例においては、質量
体の弾性部材との接着面を除く表面が、前記弾性部材と
一体のゴム状弾性材料からなる弾性膜で被覆される。す
なわち、振動の入力によって、質量体の一部が振動低減
対象部材に接触することがあるが、質量体の表面を被覆
している弾性膜がその衝撃を緩和し、打音の発生が抑制
される。In a further preferred example of the present invention, the surface of the mass body excluding the adhesive surface to the elastic member is covered with an elastic film made of a rubber-like elastic material which is integral with the elastic member. That is, a part of the mass body may come into contact with the vibration reduction target member due to the input of the vibration, but the elastic film covering the surface of the mass body absorbs the impact and suppresses the generation of hammering sound. It
【０００９】[0009]
【発明の実施の形態】図１は、本発明に係るダイナミッ
クダンパの好ましい一実施形態を示すものである。この
ダイナミックダンパは、金属板を成形したブラケット１
と、このブラケット１の外周側に同心的に配置された金
属環状体からなる質量体２とを、ゴム状弾性材料からな
る弾性部材３を介して互いに連結した構造を有する。FIG. 1 shows a preferred embodiment of the dynamic damper according to the present invention. This dynamic damper is a bracket 1 made of a metal plate.
And a mass body 2 made of a metal annular body and arranged concentrically on the outer peripheral side of the bracket 1 are connected to each other via an elastic member 3 made of a rubber-like elastic material.
【００１０】ブラケット１は、一端中央に、ボルト４に
よって例えば自動車の車体等、振動を低減すべき対象で
あるハウジング５に締着される取付部１１と、そこから
外径側へテーパ筒状に展開した展開部１２とからなる。
参照符号１１ａは前記ボルト４を挿通するために取付部
１１に開設されたボルト挿通孔を示している。展開部１
２は、具体的にはブラケット１の軸心と直交する平面に
対する傾度が外径側へ向けて漸次小さくなる適当な曲率
で湾曲しており、すなわちベル状の展開形状となってい
る。質量体２は、その内周面２ａが、ブラケット１の展
開部１２の外周面１２ａと対応して内周側へ凸の湾曲形
状を呈し、前記展開部１２の大径側の端部１３の外径Ｄ
1 は、質量体２の内周面２ａにおける小径側の端部内径
Ｄ2 よりも大径に形成されている。弾性部材３は、互い
に対向する前記外周面１２ａと内周面２ａの間に加硫成
形と同時に加硫接着されたもので、前記湾曲形状に倣っ
た断面形状を有する。また、質量体２はブラケット１の
取付部１１におけるハウジング５との接触面より適宜後
退した位置にあって、言い換えれば、前記取付部１１は
質量体２の端面から適宜突出して形成されている。The bracket 1 has a mounting portion 11 at the center of one end, which is fastened by a bolt 4 to a housing 5 which is an object for which vibration is to be reduced, such as an automobile body, and a tapered tubular shape from there to an outer diameter side. It is composed of the expanded unit 12.
Reference numeral 11 a indicates a bolt insertion hole formed in the mounting portion 11 for inserting the bolt 4. Development part 1
Specifically, the reference numeral 2 is curved with an appropriate curvature such that the inclination with respect to a plane orthogonal to the axis of the bracket 1 gradually decreases toward the outer diameter side, that is, a bell-shaped expanded shape. The mass body 2 has an inner peripheral surface 2a having a curved shape that is convex toward the inner peripheral side in correspondence with the outer peripheral surface 12a of the expanding portion 12 of the bracket 1, and the end portion 13 of the expanding portion 12 on the large diameter side. Outer diameter D
1 is formed to have a larger diameter than the end inner diameter D 2 on the smaller diameter side of the inner peripheral surface 2a of the mass body 2. The elastic member 3 is vulcanized and bonded between the outer peripheral surface 12a and the inner peripheral surface 2a that face each other at the same time as vulcanization molding, and has a cross-sectional shape that follows the curved shape. Further, the mass body 2 is located at a position appropriately retracted from the contact surface of the mounting portion 11 of the bracket 1 with the housing 5, in other words, the mounting portion 11 is formed to appropriately project from the end surface of the mass body 2.
【００１１】この実施形態によるダイナミックダンパ
は、典型的には図示の状態、すなわちブラケット１がそ
の取付部１１を上に向けて、ボルト４でハウジング５の
下面に締着されることにより取り付けられるもので、こ
の取付状態では、質量体２とハウジング５の下面との間
に適当な隙間Ｇが形成される。これによって、質量体２
は、ブラケット１の外周で自由に相対変位することがで
きる。The dynamic damper according to this embodiment is typically mounted in the state shown in the drawing, that is, by mounting the bracket 1 with its mounting portion 11 facing upward, by tightening it on the lower surface of the housing 5 with a bolt 4. Then, in this mounted state, an appropriate gap G is formed between the mass body 2 and the lower surface of the housing 5. By this, mass 2
Can be freely displaced relative to the outer circumference of the bracket 1.
【００１２】弾性部材３を挟んで互いに対向されたブラ
ケット１の展開部１２の外周面１２ａと質量体２の内周
面２ａは、外径側ほど傾度が小さくなる湾曲形状を呈す
るため、質量体２の重量による鉛直方向の荷重は、弾性
部材３に対して、傾度の小さい外径側部分（下側）３１
では圧縮、傾度の大きい内径側部分（上側）３２では剪
断方向に作用する。また、ハウジング５側から軸心と直
角な方向（水平方向）の振動変位が入力された場合は、
弾性部材３は傾度の小さい外径側部分（下側）３１で剪
断、傾度の大きい内径側部分（上側）３２で圧縮とな
る。このため、弾性部材３には大きな引っ張り力が作用
することがなく、耐久性低下が有効に防止される。ま
た、弾性部材３が万一破断しても、展開部１２の大径側
の端部１３の外径Ｄ1 は質量体２の内周面２ａにおける
小径側の端部内径Ｄ2 より大径であるため、質量体２の
脱落は生じない。Since the outer peripheral surface 12a of the expanding portion 12 of the bracket 1 and the inner peripheral surface 2a of the mass body 2 which are opposed to each other with the elastic member 3 in between have a curved shape in which the inclination becomes smaller toward the outer diameter side, the mass body The vertical load due to the weight of 2 is smaller than that of the elastic member 3 on the outer diameter side portion (lower side) 31.
Then, the inner diameter side portion (upper side) 32 having a large compression and inclination acts in the shearing direction. When vibration displacement in the direction (horizontal direction) perpendicular to the axis is input from the housing 5 side,
The elastic member 3 is sheared at the outer diameter side portion (lower side) 31 having a small inclination and compressed at the inner diameter side portion (upper side) 32 having a large inclination. Therefore, a large pulling force does not act on the elastic member 3, and the deterioration of durability is effectively prevented. Further, even if the elastic member 3 is broken, the outer diameter D 1 of the large diameter side end portion 13 of the expanded portion 12 is larger than the small diameter side end portion inner diameter D 2 of the inner peripheral surface 2 a of the mass body 2. Therefore, the mass body 2 does not drop off.
【００１３】図２は、本発明に係るダイナミックダンパ
の他の好ましい実施形態を示すものである。この実施形
態においては、上記図１の構造に加えて、質量体２の弾
性部材３との接着面以外の表面、すなわち外周面２ｂ及
び端面２ｃが、弾性膜３３で被覆された構造を備える。
この弾性膜３３は、ゴム状弾性材料による弾性部材３の
加硫成形・加硫接着と同時に形成されたものである。こ
の構造によれば、共振による質量体２の振動変位の振幅
が大きくなっても、金属からなる質量体２が金属からな
るハウジング５の下面と直接接触することはなく、接触
による衝撃が弾性膜３３によって緩和されるので、打音
が抑制される。FIG. 2 shows another preferred embodiment of the dynamic damper according to the present invention. In this embodiment, in addition to the structure of FIG. 1, the surface of the mass body 2 other than the bonding surface with the elastic member 3, that is, the outer peripheral surface 2b and the end surface 2c is covered with the elastic film 33.
The elastic film 33 is formed simultaneously with vulcanization molding and vulcanization adhesion of the elastic member 3 made of a rubber-like elastic material. According to this structure, even if the amplitude of the vibration displacement of the mass body 2 due to resonance increases, the mass body 2 made of metal does not come into direct contact with the lower surface of the housing 5 made of metal, and the impact due to the contact causes the elastic film. Since it is moderated by 33, the tapping sound is suppressed.
【００１４】なお、図示の実施形態によれば、質量体２
の外径がブラケット１における展開部１２の大径側の端
部外径と等しく形成されているが、質量体２の外径は、
これに与える慣性質量によって決定されるものであっ
て、図示のものには特に限定されない。According to the illustrated embodiment, the mass body 2
The outer diameter of the mass body 2 is formed to be equal to the outer diameter of the end portion of the expansion portion 12 of the bracket 1 on the large diameter side.
It is determined by the inertial mass given to it, and is not particularly limited to what is shown.
【００１５】[0015]
【発明の効果】本発明のダイナミックダンパによれば、
次のような効果が実現される。 (1) 弾性部材が質量体の重量による引っ張り荷重を受け
ず、振動変位を圧縮及び剪断方向に受けるため、弾性部
材の耐久性が向上する。 (2) 万一弾性部材が破断しても、質量体がブラケットか
ら脱落しない。 (3) 共振によって大きく振れた質量体が他部材に接触す
ることによる騒音が抑制される。According to the dynamic damper of the present invention,
The following effects are realized. (1) Since the elastic member does not receive a tensile load due to the weight of the mass body and receives a vibration displacement in the compression and shear directions, the durability of the elastic member is improved. (2) Even if the elastic member breaks, the mass does not fall off the bracket. (3) The noise caused by the mass body shaken largely due to resonance coming into contact with another member is suppressed.
【図１】本発明に係るダイナミックダンパの好ましい一
実施形態を示す取付状態の断面図である。FIG. 1 is a sectional view of a mounted state showing a preferred embodiment of a dynamic damper according to the present invention.
【図２】本発明に係るダイナミックダンパの他の好まし
い実施形態を示す取付状態の断面図である。FIG. 2 is a sectional view of a dynamic damper according to another preferred embodiment of the present invention in a mounted state, showing another preferred embodiment.
【図３】ダイナミックダンパの従来例を示す断面図であ
る。FIG. 3 is a sectional view showing a conventional example of a dynamic damper.
１ ブラケット １１ 取付部 １１ａ 孔 １２ 展開部 １２ａ 外周面 １３ 大径側の端部 ２ 質量体 ２ａ 内周面 ３ 弾性部材 ３１ 外径側部分 ３２ 内径側部分 ３３ 弾性膜 DESCRIPTION OF SYMBOLS 1 Bracket 11 Attachment part 11a Hole 12 Development part 12a Outer peripheral surface 13 Large diameter end 2 Mass body 2a Inner peripheral surface 3 Elastic member 31 Outer diameter side part 32 Inner diameter side part 33 Elastic membrane
Claims (2)
部（１１）からテーパ筒状に展開した展開部（１２）を
有するブラケット（１）の前記展開部（１２）の外周側
に、内周面（２ａ）が前記ブラケット（１）の外周面
（１２ａ）と対応した形状の環状の質量体（２）が配置
され、 前記展開部（１２）の外周面（１２ａ）と質量体（２）
の内周面（２ａ）がゴム状弾性材料からなる弾性部材
（３）を介して互いに連結され、 前記ブラケット（１）の前記取付部（１１）と反対側の
端部（１３）の外径（Ｄ1 ）が、前記質量体（２）の内
周面（２ａ）の小径側の内径（Ｄ2 ）よりも大径である
ことを特徴とするダイナミックダンパ。1. A bracket (1) having a mounting portion (11) at the center of one end and a developing portion (12) deployed from this mounting portion (11) in a tapered tubular shape, on the outer peripheral side of the developing portion (12), An annular mass body (2) having an inner peripheral surface (2a) having a shape corresponding to the outer peripheral surface (12a) of the bracket (1) is arranged, and the outer peripheral surface (12a) and the mass body (2) of the expanding portion (12). 2)
Inner peripheral surfaces (2a) of the bracket (1) are connected to each other through an elastic member (3) made of a rubber-like elastic material, and an outer diameter of an end portion (13) of the bracket (1) opposite to the mounting portion (11). (D 1 ) is a larger diameter than the inner diameter (D 2 ) on the small diameter side of the inner peripheral surface (2a) of the mass body (2).
との接着面を除く表面が、前記弾性部材（３）と一体の
ゴム状弾性材料からなる弾性膜（３３）で被覆されたこ
とを特徴とする請求項１に記載のダイナミックダンパ。2. The elastic member (3) of the mass body (2).
2. The dynamic damper according to claim 1, wherein the surfaces other than the adhesion surface of the elastic member are covered with an elastic film (33) made of a rubber-like elastic material that is integral with the elastic member (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25585295A JPH0979315A (en) | 1995-09-08 | 1995-09-08 | Dynamic damper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25585295A JPH0979315A (en) | 1995-09-08 | 1995-09-08 | Dynamic damper |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0979315A true JPH0979315A (en) | 1997-03-25 |
Family
ID=17284490
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25585295A Withdrawn JPH0979315A (en) | 1995-09-08 | 1995-09-08 | Dynamic damper |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0979315A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002042662A1 (en) * | 2000-11-24 | 2002-05-30 | Toyo Tire & Rubber Co., Ltd. | Connecting rod |
-
1995
- 1995-09-08 JP JP25585295A patent/JPH0979315A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002042662A1 (en) * | 2000-11-24 | 2002-05-30 | Toyo Tire & Rubber Co., Ltd. | Connecting rod |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20021203 |