JP7627705B2 - Dynamic Damper - Google Patents

Dynamic Damper Download PDF

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JP7627705B2
JP7627705B2 JP2022565333A JP2022565333A JP7627705B2 JP 7627705 B2 JP7627705 B2 JP 7627705B2 JP 2022565333 A JP2022565333 A JP 2022565333A JP 2022565333 A JP2022565333 A JP 2022565333A JP 7627705 B2 JP7627705 B2 JP 7627705B2
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central axis
rubber portion
sleeve
rubber
outer circumferential
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JPWO2022113947A1 (en
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耀亮 村田
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Nok Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
    • F16F15/12—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
    • F16F15/12—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon
    • F16F15/121—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon using springs as elastic members, e.g. metallic springs
    • F16F15/124—Elastomeric springs
    • F16F15/126—Elastomeric springs consisting of at least one annular element surrounding the axis of rotation

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Motor Power Transmission Devices (AREA)

Description

本発明はダイナミックダンパーに関する。具体的には、例えば自動車のプロペラシャフト等の中空回転軸の内周面に取り付けられて、この中空回転軸に発生する振動や騒音を抑制するダイナミックダンパーに関する。The present invention relates to a dynamic damper. Specifically, the present invention relates to a dynamic damper that is attached to the inner peripheral surface of a hollow rotating shaft, such as a propeller shaft of an automobile, to suppress vibrations and noise generated in the hollow rotating shaft.

従来、自動車のＦＲ車または４ＷＤ車に使用される動力伝達系の一部を構成するプロペラシャフト内には、曲げ共振を低減するためのダイナミックダンパーが圧入されている。 Conventionally, a dynamic damper is pressed into the propeller shaft, which forms part of the power transmission system used in front-wheel drive or four-wheel drive automobiles, to reduce bending resonance.

従来のダイナミックダンパーについて、図を用いて説明する。図３（ａ）は従来のダイナミックダンパーの側面図（概略図）であり、図３（ｂ）は図３（ａ）における中心軸ωを通るＢ－Ｂ´線にてこれを切断した場合の断面図（概略図）である。A conventional dynamic damper will be explained using the figures. Figure 3(a) is a side view (schematic diagram) of a conventional dynamic damper, and Figure 3(b) is a cross-sectional view (schematic diagram) of the same taken along line B-B' passing through the central axis ω in Figure 3(a).

図３に示すように、ダイナミックダンパー１０１は、外径側に配置され、中空回転軸の内周面に密着する外周側ゴム部１０２と、その内周面に着いている金属製のスリーブ１０３と、中空回転軸の中心軸付近に配置される金属製のインナーウエイト１０４と、スリーブ１０３とインナーウエイト１０４との間に設けられ、これらを連結するマウントゴム１０５とを有する。
マウントゴム１０５には、通常、軸方向に貫通する複数のスリット１０５ｂが設けられ、複数の連結部１０５ａによってスリーブ１０３とインナーウエイト１０４とを連結している。インナーウエイト１０４はマウントゴム１０５の連結部１０５ａによって支持されている。 As shown in Figure 3, the dynamic damper 101 is arranged on the outer diameter side and has an outer rubber part 102 that is in close contact with the inner surface of the hollow rotating shaft, a metal sleeve 103 attached to the inner surface, a metal inner weight 104 that is arranged near the central axis of the hollow rotating shaft, and a mounting rubber 105 that is provided between the sleeve 103 and the inner weight 104 and connects them.
The mount rubber 105 is usually provided with a plurality of slits 105b penetrating in the axial direction, and a plurality of connecting portions 105a connect the sleeve 103 and the inner weight 104. The inner weight 104 is supported by the connecting portions 105a of the mount rubber 105.

ダイナミックダンパー１０１がプロペラシャフト等の中空回転軸内に圧入固定されると、所定の振動周波数域においてダイナミックダンパー１０１は副振動系として入力振動と逆位相で共振する動的吸振作用を奏し、プロペラシャフト等の中空回転軸において発生し得る振動および騒音を抑制する。When the dynamic damper 101 is pressed and fixed into a hollow rotating shaft such as a propeller shaft, the dynamic damper 101 acts as a secondary vibration system, resonating in antiphase with the input vibration in a specified vibration frequency range, thereby suppressing vibrations and noise that may occur in the hollow rotating shaft such as a propeller shaft.

上記のような従来のダイナミックダンパー１０１をプロペラシャフト等の中空回転軸内に圧入固定すると、外周側ゴム部１０２が径方向に圧縮される。ここで中空回転軸の内径は一定ではないため、外周側ゴム部１０２における各部の圧縮率は完全に均一にはなり難かった。仮に外周側ゴム部１０２における各部の圧縮率が大きく異なる場合、ダイナミックダンパーの振動特性等が設計値と一致しなくなる恐れもある。したがって、この圧縮率は外周側ゴム部１０２における各部において、より均一に近いことが好ましい。
また、中空回転軸内へ圧入して外周側ゴム部１０２が径方向に圧縮されると、その内側に存在するスリーブ１０３およびマウントゴム１０５にも、ある程度の負荷がかかり得る。この負荷が大きすぎると、ダイナミックダンパーの振動特性等が設計値と一致しなくなる恐れもある。したがって、その負荷の程度はより少ないことが好ましい。 When the conventional dynamic damper 101 as described above is press-fitted and fixed into a hollow rotating shaft such as a propeller shaft, the outer circumferential rubber portion 102 is compressed in the radial direction. Here, since the inner diameter of the hollow rotating shaft is not constant, it is difficult to achieve a completely uniform compression ratio at each portion of the outer circumferential rubber portion 102. If the compression ratios at each portion of the outer circumferential rubber portion 102 differ significantly, there is a risk that the vibration characteristics, etc. of the dynamic damper will not match the design values. Therefore, it is preferable that the compression ratio be as close to uniform as possible at each portion of the outer circumferential rubber portion 102.
In addition, when the outer circumferential rubber portion 102 is compressed in the radial direction by being pressed into the hollow rotating shaft, a certain amount of load may also be applied to the sleeve 103 and the mount rubber 105 located inside. If this load is too large, there is a risk that the vibration characteristics of the dynamic damper will not match the design values. Therefore, it is preferable that the degree of this load is as small as possible.

また、中空回転軸内を洗浄する場合があるが、中空回転軸内へ流し込んだ洗浄水が、洗浄後には中空回転軸内に残存していないことが好ましい。In addition, the inside of the hollow rotating shaft may be cleaned, but it is preferable that the cleaning water poured into the hollow rotating shaft does not remain inside the hollow rotating shaft after cleaning.

本発明は上記のような課題を解決することを目的とする。すなわち、本発明は、中空回転軸内に設置したときに、外周側ゴム部における各部の圧縮率が均一になりやすく、スリーブおよびマウントゴムへの負荷が小さくなり、さらに中空回転軸内へ洗浄液を流し込んで洗浄したときに、その後、洗浄液が残存し難いダイナミックダンパーを提供することを目的とする。The present invention aims to solve the above problems. That is, the present invention aims to provide a dynamic damper that, when installed inside a hollow rotating shaft, tends to have a uniform compression rate for each part of the outer rubber part, reduces the load on the sleeve and mount rubber, and is less likely to leave cleaning fluid behind after cleaning by pouring cleaning fluid into the hollow rotating shaft.

上記課題を解決するために本発明者は鋭意検討し、本発明のダイナミックダンパーを完成させた。
本発明のダイナミックダンパーは、中空回転軸の内周側に取り付けられるダイナミックダンパーであって、
外径側に配置され、前記中空回転軸の内周面に密着する円筒状の外周側ゴム部と、
前記外周側ゴム部の内周側に配置される円筒状のスリーブと、
前記中空回転軸の中心軸を含む位置に配置される円筒状または円柱状のインナーウエイトと、
前記スリーブと前記インナーウエイトとの間に設けられ、前記インナーウエイトを支持するマウントゴムと、
を有し、
前記外周側ゴム部の外周面における前記中心軸方向の中心部に、全周にわたって外周溝が形成されており、
前記中空回転軸の内周面に取り付けられて前記外周側ゴム部が径方向に圧縮されると、前記外周側ゴム部の外周面における前記外周溝によって前記中心軸方向に隔てられた２つの部分が、前記中心軸方向において互いに離れる方向に移動することで、前記外周側ゴム部の２つの側面における外周面側が内周面側よりも前記中心軸方向の外側に位置することになり、前記外周側ゴム部の２つの前記側面が前記外周面側から前記内周面側へ向かって徐々に内径が小さくなるテーパ形状を備えるように構成されている、ダイナミックダンパーである。 In order to solve the above problems, the present inventors have conducted intensive research and have completed the dynamic damper of the present invention.
The dynamic damper of the present invention is a dynamic damper attached to an inner peripheral side of a hollow rotating shaft,
a cylindrical outer circumferential rubber portion disposed on an outer diameter side and in close contact with an inner circumferential surface of the hollow rotating shaft;
a cylindrical sleeve disposed on an inner peripheral side of the outer peripheral rubber portion;
a cylindrical or columnar inner weight disposed at a position including a central axis of the hollow rotating shaft;
a mount rubber provided between the sleeve and the inner weight and supporting the inner weight;
having
an outer circumferential groove is formed around the entire periphery of the outer circumferential surface of the outer circumferential rubber portion at a center in the central axis direction,
When the outer rubber portion is attached to the inner surface of the hollow rotating shaft and compressed radially, two portions separated in the central axis direction by the outer groove on the outer surface of the outer rubber portion move in a direction away from each other in the central axis direction, so that the outer surface side of the two side surfaces of the outer rubber portion is positioned further outward in the central axis direction than the inner surface side, and the two side surfaces of the outer rubber portion are configured to have a tapered shape with an inner diameter gradually decreasing from the outer surface side toward the inner surface side.

本発明によれば、中空回転軸内に設置したときに、外周側ゴム部における各部の圧縮率が均一になりやすく、スリーブおよびマウントゴムへの負荷が小さくなり、さらに中空回転軸内へ洗浄液を流し込んで洗浄したときに、その後、洗浄液が残存し難いダイナミックダンパーを提供することができる。 According to the present invention, when installed inside a hollow rotating shaft, a dynamic damper can be provided in which the compression rate of each part of the outer rubber portion is more likely to be uniform, the load on the sleeve and mounting rubber is reduced, and furthermore, when cleaning liquid is poured into the hollow rotating shaft for cleaning, cleaning liquid is less likely to remain afterwards.

図１（ａ）は本発明のダイナミックダンパーの側面図（概略図）であり、図１（ｂ）は図１（ａ）におけるＡ－Ａ´線断面図（概略図）である。FIG. 1(a) is a side view (schematic diagram) of a dynamic damper of the present invention, and FIG. 1(b) is a cross-sectional view (schematic diagram) taken along line AA' in FIG. 1(a). 図１に示した本発明のダイナミックダンパーを中空回転軸内に取り付けた場合を示す概略断面図である。2 is a schematic cross-sectional view showing the dynamic damper of the present invention shown in FIG. 1 mounted inside a hollow rotating shaft. 図３（ａ）は従来のダイナミックダンパーの側面図であり、図３（ｂ）は図３（ａ）におけるＢ－Ｂ´線断面図（概略図）である。FIG. 3(a) is a side view of a conventional dynamic damper, and FIG. 3(b) is a cross-sectional view (schematic diagram) taken along line BB' in FIG. 3(a).

本発明のダイナミックダンパーについて説明する。
本発明のダイナミックダンパーは、中空回転軸の内周側に取り付けられて、この中空回転軸に発生する振動や騒音を抑制するダイナミックダンパーである。
中空回転軸として主に自動車のプロペラシャフトが挙げられる。 The dynamic damper of the present invention will now be described.
The dynamic damper of the present invention is a dynamic damper that is attached to the inner peripheral side of a hollow rotating shaft and suppresses vibrations and noise generated in this hollow rotating shaft.
An example of a hollow rotating shaft is a propeller shaft for an automobile.

本発明のダイナミックダンパーの好適態様について、図を用いて説明する。図１（ａ）は好適態様の本発明のダイナミックダンパーの側面図（概略図）であり、図１（ｂ）は図１（ａ）における中心軸ωを通るＡ－Ａ´線にてこれを切断した場合の断面図（概略図）である。
以下に図を用いて説明する本発明のダイナミックダンパーは好適態様であって、本発明のダイナミックダンパーはこれらに限定されない。 A preferred embodiment of the dynamic damper of the present invention will be described with reference to the drawings. Figure 1(a) is a side view (schematic diagram) of the preferred embodiment of the dynamic damper of the present invention, and Figure 1(b) is a cross-sectional view (schematic diagram) of the dynamic damper taken along line A-A' passing through the central axis ω in Figure 1(a).
The dynamic damper of the present invention described below with reference to the drawings is a preferred embodiment, and the dynamic damper of the present invention is not limited thereto.

図１に示すように、本発明のダイナミックダンパー１は、外周側ゴム部３と、スリーブ５と、インナーウエイト７と、マウントゴム９と、を有する。As shown in Figure 1, the dynamic damper 1 of the present invention has an outer peripheral rubber portion 3, a sleeve 5, an inner weight 7, and a mounting rubber 9.

＜外周側ゴム部＞
本発明のダイナミックダンパー１において外周側ゴム部３は最も外周側に配置される。そして、外周側ゴム部３の外周面が中空回転軸の内周面に密着する。 <Outer rubber part>
In the dynamic damper 1 of the present invention, the outer circumferential rubber portion 3 is disposed on the outermost side. The outer circumferential surface of the outer circumferential rubber portion 3 is in close contact with the inner circumferential surface of the hollow rotating shaft.

外周側ゴム部３は円筒状であり、その中心軸は、原則、本発明のダイナミックダンパー１の中心軸ωと一致する。
そして、図１（ｂ）に示すように、外周側ゴム部３の外周面における、中心軸ωと平行方向の中心部に、全周にわたって溝が形成されている。この溝を、本発明では外周溝３ａともいう。この外周溝３ａによって、外周面は中心軸ωと平行方向において２つの部分３１、３３に隔てられている。
外周溝３ａの役割や作用等については、後に詳細に説明する。 The outer circumferential rubber portion 3 is cylindrical, and its central axis essentially coincides with the central axis ω of the dynamic damper 1 of the present invention.
1(b), a groove is formed around the entire circumference of the central portion of the outer circumferential surface of the outer rubber portion 3 in the direction parallel to the central axis ω. This groove is also referred to as an outer circumferential groove 3a in the present invention. The outer circumferential surface is divided into two portions 31 and 33 in the direction parallel to the central axis ω by the outer circumferential groove 3a.
The role and function of the outer circumferential groove 3a will be described in detail later.

外周側ゴム部３の形状は上記通り円筒状であり外周溝３ａを有するが、その他の形状については特に限定されない。例えば従来公知のものと同様であってよい。例えば本発明のダイナミックダンパーを中空回転軸の内周側へ圧入しやすいように、外周側ゴム部３の外周面と側面との境界である角が削られ、丸みを持つものとなっていることが好ましい。The shape of the outer rubber part 3 is cylindrical as described above and has an outer circumferential groove 3a, but other shapes are not particularly limited. For example, it may be the same as a conventionally known shape. For example, it is preferable that the corners at the boundary between the outer circumferential surface and the side surface of the outer rubber part 3 are rounded off to make it easier to press the dynamic damper of the present invention into the inner circumferential side of the hollow rotating shaft.

外周側ゴム部３の大きさや材質は特に限定されず、例えば従来公知のものと同様であってよい。外周側ゴム部３の材質として、例えば天然ゴム（ＮＲ）、エチレンプロピレンジエンゴム（ＥＰＤＭ）、スチレンブタジエンゴム（ＳＢＲ）、ブタジエンゴム（ＢＲ）、アクリロニトリルブタジエンゴム（ＮＢＲ）が挙げられる。The size and material of the outer rubber portion 3 are not particularly limited and may be the same as those known in the art. Examples of materials for the outer rubber portion 3 include natural rubber (NR), ethylene propylene diene rubber (EPDM), styrene butadiene rubber (SBR), butadiene rubber (BR), and acrylonitrile butadiene rubber (NBR).

＜スリーブ＞
本発明のダイナミックダンパー１においてスリーブ５は外周側ゴム部３の内周側に配置される。スリーブ５と外周側ゴム部３との間に別のものが存在してもよいが、スリーブ５の外周面が外周側ゴム部３の内周面に着いていることが好ましく、スリーブ５の外周面と外周側ゴム部３の内周面とが接着されていることがより好ましく、加硫接着されていることがさらに好ましい。スリーブ５の外周面と外周側ゴム部３の内周面とは接着されていると、本発明のダイナミックダンパー１を中空回転軸の内周面に取り付けたときに、外周側ゴム部３が意図する形状に変形され、その形状に維持されやすいからである。これについては、後に詳細に説明する。 ＜Sleeve＞
In the dynamic damper 1 of the present invention, the sleeve 5 is disposed on the inner circumferential side of the outer circumferential rubber part 3. Although there may be something else between the sleeve 5 and the outer circumferential rubber part 3, it is preferable that the outer circumferential surface of the sleeve 5 is attached to the inner circumferential surface of the outer circumferential rubber part 3, and it is more preferable that the outer circumferential surface of the sleeve 5 and the inner circumferential surface of the outer circumferential rubber part 3 are bonded, and it is even more preferable that they are vulcanization bonded. If the outer circumferential surface of the sleeve 5 and the inner circumferential surface of the outer circumferential rubber part 3 are bonded, when the dynamic damper 1 of the present invention is attached to the inner circumferential surface of the hollow rotating shaft, the outer circumferential rubber part 3 is easily deformed into an intended shape and maintained in that shape. This will be described in detail later.

スリーブ５は円筒状であり、その中心軸ωと平行方向の長さは、外周側ゴム部３における内周面の中心軸ωと平行方向の長さと一致することが好ましい。The sleeve 5 is cylindrical, and it is preferable that its length parallel to its central axis ω coincides with the length parallel to the central axis ω of the inner surface of the outer rubber portion 3.

スリーブ５の大きさや材質は特に限定されず、例えば従来公知のものと同様であってよい。スリーブ５は変形し難い材料からなることが好ましく、具体的には、例えば金属製であることが好ましい。The size and material of the sleeve 5 are not particularly limited and may be the same as those known in the art. The sleeve 5 is preferably made of a material that is difficult to deform, and more specifically, it is preferably made of metal, for example.

＜インナーウエイト＞
本発明のダイナミックダンパー１においてインナーウエイト７は、中空回転軸の中心軸ωを含む位置に配置される。すなわち、中空回転軸の中心軸ωがインナーウエイト７を通過する。
また、インナーウエイト７の円筒状または円柱状であって、その中心軸は、原則、中空回転軸の中心軸ωと一致する。 <Inner weight>
In the dynamic damper 1 of the present invention, the inner weight 7 is disposed at a position including the central axis ω of the hollow rotating shaft. In other words, the central axis ω of the hollow rotating shaft passes through the inner weight 7.
Moreover, the inner weight 7 is cylindrical or columnar, and its central axis basically coincides with the central axis ω of the hollow rotating shaft.

インナーウエイト７の大きさや材質は特に限定されず、所望の共振周波数特性を得ることができるものであればよい。インナーウエイト７は、例えば金属製であることが好ましい。There are no particular limitations on the size or material of the inner weight 7, as long as it can provide the desired resonant frequency characteristics. It is preferable that the inner weight 7 is made of metal, for example.

＜マウントゴム＞
本発明のダイナミックダンパー１においてマウントゴム９は、スリーブ５とインナーウエイト７との間に設けられる。そして、マウントゴム９はインナーウエイト７を支持する。
スリーブ５とインナーウエイト７との間に別のものが存在していてもよいが、それが存在しておらずスリーブ５とインナーウエイト７とをマウントゴム９が連結していることが好ましい。マウントゴム９は、スリーブ５およびインナーウエイト７に接着されていることがより好ましく、加硫接着されていることがさらに好ましい。 <Mount rubber>
In the dynamic damper 1 of the present invention, the mount rubber 9 is provided between the sleeve 5 and the inner weight 7. The mount rubber 9 supports the inner weight 7.
Although there may be something else between the sleeve 5 and the inner weight 7, it is preferable that there is no other thing between the sleeve 5 and the inner weight 7 and that the mount rubber 9 connects the sleeve 5 and the inner weight 7. It is more preferable that the mount rubber 9 is bonded to the sleeve 5 and the inner weight 7, and it is even more preferable that it is bonded by vulcanization.

マウントゴム９には、軸方向に貫通する複数のスリット９ｂが設けられ、複数の連結部９ａによって、スリーブ５とインナーウエイト７とを連結していることが好ましい。インナーウエイト７はマウントゴム９における連結部９ａによって支持され、中心軸ω付近に保持される。The mount rubber 9 is preferably provided with multiple slits 9b penetrating in the axial direction, and multiple connecting portions 9a connect the sleeve 5 and the inner weight 7. The inner weight 7 is supported by the connecting portions 9a in the mount rubber 9 and held near the central axis ω.

マウントゴム９の形状、大きさ、材質等は特に限定されず、例えば従来公知のものと同様であってよい。マウントゴム９の材質として、例えば天然ゴム（ＮＲ）、エチレンプロピレンジエンゴム（ＥＰＤＭ）、スチレンブタジエンゴム（ＳＢＲ）、ブタジエンゴム（ＢＲ）、アクリロニトリルブタジエンゴム（ＮＢＲ）が挙げられる。The shape, size, material, etc. of the mount rubber 9 are not particularly limited and may be the same as those known in the art. Examples of materials for the mount rubber 9 include natural rubber (NR), ethylene propylene diene rubber (EPDM), styrene butadiene rubber (SBR), butadiene rubber (BR), and acrylonitrile butadiene rubber (NBR).

＜作用＞
このような本発明のダイナミックダンパー１は、前述のように、外周側ゴム部３の外周面における中心軸ω方向の中心部に、全周にわたって外周溝３ａが形成されている。
ここで中心部とは中心を含む位置を意味しているものとする。したがって、外周溝３ａは外周側ゴム部３の外周面における中心軸ω方向における中心を含んでいる。
また、外周側ゴム部３の外周面における外周溝３ａによって、外周面は中心軸ωと平行方向において２つの部分３１、３３に分けられている。 <Action>
As described above, in the dynamic damper 1 of the present invention, the outer circumferential groove 3a is formed over the entire periphery at the center in the direction of the central axis ω on the outer circumferential surface of the outer circumferential rubber portion 3.
Here, the central portion means a position including the center. Therefore, the outer circumferential groove 3 a includes the center in the direction of the central axis ω on the outer circumferential surface of the outer circumferential rubber portion 3 .
Further, the outer circumferential surface of the outer circumferential rubber portion 3 is divided into two portions 31 and 33 in a direction parallel to the central axis ω by an outer circumferential groove 3a in the outer circumferential surface.

本発明のダイナミックダンパー１を中空回転軸の内周面に取り付けると、図２に示す状態となる。図２は本発明のダイナミックダンパー１を中空回転軸の内周面に取り付けた状態を示す断面図（中心軸ωを含む面で切断した断面図）である。When the dynamic damper 1 of the present invention is attached to the inner peripheral surface of a hollow rotating shaft, it is in the state shown in Figure 2. Figure 2 is a cross-sectional view (cut at a plane including the central axis ω) showing the state in which the dynamic damper 1 of the present invention is attached to the inner peripheral surface of a hollow rotating shaft.

図２に示すように、中空回転軸１０の内周面１０ａに本発明のダイナミックダンパー１における外周ゴム部３の外周面を密着させ、これを取り付けると、外周側ゴム部３が径方向（中心軸ωに垂直方向）に圧縮される。このときに外周側ゴム部３の外周面における２つの部分３１、３３が、外周溝３ａを中心として中心軸ωに平行方向において互いに離れる方向に移動する。
そうすると、外周側ゴム部３の一方の側面３５において外周面側３５ａが内周面側３５ｂよりも中心軸ωに平行方向において外側に位置することになる。他方の側面３７においても同様に、外周面側３７ａが内周面側３７ｂよりも中心軸ωに平行方向において外側に位置することになる。その結果、外周側ゴム部３の２つの側面３５、３７が外周面側３５ａ、３７ａから内周面側３５ｂ、３７ｂへ向かって徐々に内径が小さくなるテーパ形状を備えるようになる。 2, when the outer circumferential surface of the outer circumferential rubber portion 3 of the dynamic damper 1 of the present invention is brought into intimate contact with the inner circumferential surface 10a of the hollow rotating shaft 10 and attached, the outer circumferential rubber portion 3 is compressed in the radial direction (perpendicular to the central axis ω). At this time, the two portions 31, 33 on the outer circumferential surface of the outer circumferential rubber portion 3 move away from each other in a direction parallel to the central axis ω, centered on the outer circumferential groove 3a.
As a result, the outer circumferential surface side 35a of one side surface 35 of the outer circumferential rubber portion 3 is positioned outwardly of the inner circumferential surface side 35b in the direction parallel to the central axis ω. Similarly, the outer circumferential surface side 37a of the other side surface 37 is positioned outwardly of the inner circumferential surface side 37b in the direction parallel to the central axis ω. As a result, the two side surfaces 35, 37 of the outer circumferential rubber portion 3 have a tapered shape in which the inner diameter gradually decreases from the outer circumferential surface sides 35a, 37a to the inner circumferential surface sides 35b, 37b.

本発明のダイナミックダンパーは図１に示すような外周溝３を有するため、中空回転軸の内周側に設置したとき、外周側ゴム部３が、その側面が図２に示すテーパ形状を備えることとなるように変形する。そのため、外周側ゴム部３における各部の圧縮率は一定になりやすく、また、スリーブ５およびマウントゴム９に負荷がかかり難い。 The dynamic damper of the present invention has an outer peripheral groove 3 as shown in Figure 1, so when it is installed on the inner circumference of a hollow rotating shaft, the outer rubber part 3 deforms so that its side has a tapered shape as shown in Figure 2. As a result, the compression ratio of each part of the outer rubber part 3 tends to be constant, and the sleeve 5 and mounting rubber 9 are less likely to be subjected to load.

また、本発明のダイナミックダンパーを中空回転軸の内周側に設置したときに、図２に示すように外周側ゴム部３における２つの側面３５、３７がテーパ形状を備えるようになるため、中空回転軸内へ洗浄液を流し込んで洗浄したときに、洗浄液が残存し難い。特に、中空回転軸の内周面と外周側ゴム部３の外周面との境界であって、外周側ゴム部３の側面３５、３７の外周面側３５ａ、３７ａの部位に洗浄液が残存しやすいが、外周側ゴム部３の２つの側面３５、３７が上記のようなテーパ形状であるため、この部位に洗浄液が残存し難い。In addition, when the dynamic damper of the present invention is installed on the inner circumference side of a hollow rotating shaft, the two side surfaces 35, 37 of the outer rubber part 3 have a tapered shape as shown in Figure 2, so that when cleaning liquid is poured into the hollow rotating shaft to clean it, cleaning liquid is less likely to remain. In particular, cleaning liquid is likely to remain in the area of the outer circumference side 35a, 37a of the side surfaces 35, 37 of the outer rubber part 3, which is the boundary between the inner circumference of the hollow rotating shaft and the outer circumference of the outer rubber part 3, but since the two side surfaces 35, 37 of the outer rubber part 3 have the tapered shape as described above, cleaning liquid is less likely to remain in this area.

なお、本発明のダイナミックダンパーにおいて外周溝の形、大きさ、深さ等は、本発明のダイナミックダンパーを中空回転軸の内周面に取り付けて前記外周側ゴム部が径方向に圧縮された場合に、外周側ゴム部３の外周面における外周溝３ａによって中心軸ω方向に隔てられた２つの部分３１、３３が、中心軸ω方向において互いに離れる方向に移動することで、外周側ゴム部３の２つの側面３５、３７における外周面側３５ａ、３７ａが内周面側３５ｂ、３７ｂよりも中心軸ω方向の外側に位置することになり、外周側ゴム部３の２つの側面３５、３７が外周面側３５ａ、３７ａから内周面側３５ｂ、３７ｂへ向かって徐々に内径が小さくなるテーパ形状を備えることになるものであればよい。In addition, the shape, size, depth, etc. of the outer peripheral groove in the dynamic damper of the present invention may be such that, when the dynamic damper of the present invention is attached to the inner surface of a hollow rotating shaft and the outer peripheral rubber portion is compressed radially, the two portions 31, 33 separated in the direction of the central axis ω by the outer peripheral groove 3a on the outer peripheral surface of the outer peripheral rubber portion 3 move away from each other in the direction of the central axis ω, so that the outer peripheral surface sides 35a, 37a of the two side surfaces 35, 37 of the outer peripheral rubber portion 3 are positioned outside in the direction of the central axis ω relative to the inner peripheral surface sides 35b, 37b, and the two side surfaces 35, 37 of the outer peripheral rubber portion 3 have a tapered shape in which the inner diameter gradually decreases from the outer peripheral surface sides 35a, 37a toward the inner peripheral surface sides 35b, 37b.

１ 本発明のダイナミックダンパー
３ 外周側ゴム部
３ａ 外周溝
３１、３３ 外周側ゴム部の部分
３５、３７ 外周側ゴム部の側面
３５ａ、３７ａ 外周側ゴム部の側面の外周面側
３５ｂ、３７ｂ 外周側ゴム部の側面の内周面側
５ スリーブ
７ インナーウエイト
９ マウントゴム
９ａ 連結部
９ｂ スリット
１０ 中空回転軸
１０ａ 中空回転軸の内周面
１０１ 従来のダイナミックダンパー
１０２ 外周側ゴム部
１０３ スリーブ
１０４ インナーウエイト
１０５ マウントゴム
１０５ａ 連結部
１０５ｂ スリット
ω 中心軸 1 Dynamic damper of the present invention 3 Outer circumferential rubber portion
3a Outer circumferential groove 31, 33 Part of outer circumferential rubber portion 35, 37 Side of outer circumferential rubber portion 35a, 37a Outer circumferential surface side of side of outer circumferential rubber portion 35b, 37b Inner circumferential surface side of side of outer circumferential rubber portion 5 Sleeve 7 Inner weight 9 Mount rubber 9a Connecting portion 9b Slit 10 Hollow rotating shaft 10a Inner circumferential surface of hollow rotating shaft 101 Conventional dynamic damper 102 Outer circumferential rubber portion 103 Sleeve 104 Inner weight 105 Mount rubber 105a Connecting portion 105b Slit ω Central axis

この出願は、２０２０年１１月２４日に出願された日本出願特願２０２０－１９４０７７を基礎とする優先権を主張し、その開示のすべてをここに取り込む。 This application claims priority to Japanese Patent Application No. 2020-194077, filed on November 24, 2020, the disclosure of which is incorporated herein in its entirety.

Claims (1)

中空回転軸の内周側に取り付けられるダイナミックダンパーであって、
外径側に配置され、前記中空回転軸の内周面に密着する円筒状の外周側ゴム部と、
前記外周側ゴム部の内周側に配置される円筒状のスリーブと、
前記中空回転軸の中心軸を含む位置に配置される円筒状または円柱状のインナーウエイトと、
前記スリーブと前記インナーウエイトとの間に設けられ、前記インナーウエイトを支持するマウントゴムと、
を有し、
前記外周側ゴム部は円筒状であり、その外周面における前記中心軸方向の中心部に、全周にわたって外周溝が形成されており、
前記スリーブの前記中心軸と平行方向の長さは、前記外周側ゴム部における内周面の前記中心軸と平行方向の長さと一致しており、前記スリーブの外周面と前記外周側ゴム部の内周面とが全面において接着されていて、
前記中空回転軸の内周面に取り付けられて前記外周側ゴム部が径方向に圧縮されると、前記外周側ゴム部の外周面における前記外周溝によって前記中心軸方向に隔てられた２つの部分が、前記中心軸方向において互いに離れる方向に移動することで、前記外周側ゴム部の２つの側面における外周面側が内周面側よりも前記中心軸方向の外側に位置することになり、前記外周側ゴム部の２つの前記側面が前記外周面側から前記内周面側へ向かって徐々に内径が小さくなるテーパ形状を備えるように構成されている、ダイナミックダンパー（ただし、前記インナーウエイトの重心位置は前記スリーブの重心位置に対して前記スリーブの前記中心軸方向の一方側にオフセットされ、前記マウントゴムは外面から内面に向けて前記スリーブの径方向に対して前記スリーブの前記中心軸方向の一方側に傾斜して延在しているものを除く）。 A dynamic damper attached to an inner peripheral side of a hollow rotating shaft,
a cylindrical outer circumferential rubber portion disposed on an outer diameter side and in close contact with an inner circumferential surface of the hollow rotating shaft;
a cylindrical sleeve disposed on an inner peripheral side of the outer peripheral rubber portion;
a cylindrical or columnar inner weight disposed at a position including a central axis of the hollow rotating shaft;
a mount rubber provided between the sleeve and the inner weight and supporting the inner weight;
having
the outer circumferential rubber portion is cylindrical, and an outer circumferential groove is formed around the entire periphery at the center in the central axis direction of the outer circumferential surface of the outer circumferential rubber portion,
a length of the sleeve in a direction parallel to the central axis coincides with a length of an inner peripheral surface of the outer peripheral rubber portion in a direction parallel to the central axis, and an outer peripheral surface of the sleeve and an inner peripheral surface of the outer peripheral rubber portion are entirely bonded to each other,
When the outer rubber portion is attached to the inner surface of the hollow rotating shaft and compressed in the radial direction, two portions separated in the central axis direction by the outer groove on the outer surface of the outer rubber portion move in a direction away from each other in the central axis direction, so that the outer surface side of the two side surfaces of the outer rubber portion is positioned outward in the central axis direction than the inner surface side, and the two side surfaces of the outer rubber portion have a tapered shape in which the inner diameter gradually decreases from the outer surface side to the inner surface side (excluding those in which the center of gravity of the inner weight is offset to one side in the central axis direction of the sleeve with respect to the center of gravity of the sleeve, and the mounting rubber extends from the outer surface to the inner surface at an angle to one side in the central axis direction of the sleeve with respect to the radial direction of the sleeve).
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Citations (5)

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Publication number Priority date Publication date Assignee Title
JP2010216578A (en) 2009-03-17 2010-09-30 Showa Corp Dynamic damper and propeller shaft
JP2011137506A (en) 2009-12-28 2011-07-14 Nok Corp Dynamic damper for hollow rotating shaft
JP2014139450A (en) 2013-01-21 2014-07-31 Nok Corp Dynamic damper
JP2014231848A (en) 2013-05-28 2014-12-11 株式会社ショーワ Dynamic damper
JP2018204712A (en) 2017-06-06 2018-12-27 Nok株式会社 Dynamic damper

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Publication number Priority date Publication date Assignee Title
JPS5827144Y2 (en) * 1979-01-26 1983-06-13 日産デイ−ゼル工業株式会社 Cylindrical torsional damper

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010216578A (en) 2009-03-17 2010-09-30 Showa Corp Dynamic damper and propeller shaft
JP2011137506A (en) 2009-12-28 2011-07-14 Nok Corp Dynamic damper for hollow rotating shaft
JP2014139450A (en) 2013-01-21 2014-07-31 Nok Corp Dynamic damper
JP2014231848A (en) 2013-05-28 2014-12-11 株式会社ショーワ Dynamic damper
JP2018204712A (en) 2017-06-06 2018-12-27 Nok株式会社 Dynamic damper

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