JP5084410B2 - Dynamic damper for propeller shaft - Google Patents

Dynamic damper for propeller shaft Download PDF

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JP5084410B2
JP5084410B2 JP2007230889A JP2007230889A JP5084410B2 JP 5084410 B2 JP5084410 B2 JP 5084410B2 JP 2007230889 A JP2007230889 A JP 2007230889A JP 2007230889 A JP2007230889 A JP 2007230889A JP 5084410 B2 JP5084410 B2 JP 5084410B2
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outer pipe
propeller shaft
press
diameter
dynamic damper
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JP2009061893A (en
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洋司 三木
潔 谷本
成弘 小井
拓史 若尾
直樹 滝原
雅也 田代
真 池田
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Daihatsu Motor Co Ltd
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Description

本発明はプロペラシャフトの中空部内に装着され、プロペラシャフトの回転に伴う共振現象を抑制するダイナミックダンパに関するものである。 The present invention relates to a dynamic damper that is mounted in a hollow portion of a propeller shaft and suppresses a resonance phenomenon caused by rotation of the propeller shaft.

従来、変速機から出力された動力を駆動輪に伝達するため、中空状のプロペラシャフトが用いられるが、プロペラシャフトにエンジン振動が伝わって、プロペラシャフトと共振し、こもり音と呼ばれる騒音や振動を引き起こす。このような共振対策として、図６に示すようにプロペラシャフト２０の中空部内にダイナミックダンパ３０を装着した例が種々提案されている。 Conventionally, a hollow propeller shaft is used to transmit the power output from the transmission to the drive wheels. However, the engine vibration is transmitted to the propeller shaft, resonates with the propeller shaft, and generates noise and vibration called booming noise. cause. As a countermeasure against such resonance, various examples in which a dynamic damper 30 is mounted in the hollow portion of the propeller shaft 20 as shown in FIG. 6 have been proposed.

特許文献１に記載されたダイナミックダンパ３０は、図７に示すように、円筒状のアウタパイプ（外筒部材）３１と、アウタパイプ３１の軸心に配置されたインナウエイト（重り）３２と、アウタパイプ３１とインナウエイト３２との間を弾性的に連結するマウントラバー（制振部材）３３とを備えており、アウタパイプ３１をプロペラシャフト２０の内部に圧入している。アウタパイプ３１の外径はプロペラシャフトの中空部内に圧入した状態で半径方向のガタや軸方向のずれが発生しないような寸法設定とされている。しかし、プロペラシャフト２０の内径にはバラツキがあるので、アウタパイプ３１の外径を寸法管理してもアウタパイプ３１をプロペラシャフト２０の中空部に安定して圧入固定することが困難である。また、通常のプロペラシャフトは、その厚みが１．６ｍｍ程度と薄いため、アウタパイプ３１をプロペラシャフトの中空部内に無理に圧入すると、プロペラシャフトの歪みが大きくなり、機械的強度が低下するという問題がある。 As shown in FIG. 7, the dynamic damper 30 described in Patent Document 1 includes a cylindrical outer pipe (outer cylinder member) 31, an inner weight (weight) 32 disposed on the axis of the outer pipe 31, and an outer pipe 31. And an inner weight 32 are provided with a mounting rubber (damping member) 33, and the outer pipe 31 is press-fitted into the propeller shaft 20. The outer diameter of the outer pipe 31 is set so as not to cause radial play or axial displacement in a state where it is press-fitted into the hollow portion of the propeller shaft. However, since the inner diameter of the propeller shaft 20 varies, it is difficult to stably press-fit the outer pipe 31 into the hollow portion of the propeller shaft 20 even if the outer diameter of the outer pipe 31 is controlled. In addition, since the thickness of a normal propeller shaft is as thin as about 1.6 mm, if the outer pipe 31 is forcibly press-fitted into the hollow portion of the propeller shaft, distortion of the propeller shaft increases and mechanical strength decreases. is there.

このような欠点を補うものとして、図８（ａ），（ｂ）に示すように、アウタパイプ４０に半径方向外側へ膨出する複数の膨出部４１を周方向に間隔をあけて形成し、これら膨出部４１をプロペラシャフトの中空部内壁に圧接させる構造のダイナミックダンパがある（特許文献２）。なお、４２はインナウエイト、４３はマウントラバーである。膨出部４１はアウタパイプ４０の軸方向一端近傍から外周側へ段付状に膨出し、アウタパイプ４０の他端側まで軸方向に延びている。 To compensate for this drawback, as shown in FIGS. 8A and 8B, the outer pipe 40 is formed with a plurality of bulging portions 41 bulging radially outward at intervals in the circumferential direction. There is a dynamic damper having a structure in which the bulging portion 41 is pressed against the inner wall of the hollow portion of the propeller shaft (Patent Document 2). In addition, 42 is an inner weight and 43 is a mount rubber. The bulging portion 41 bulges in a stepped manner from the vicinity of one end of the outer pipe 40 in the axial direction to the outer peripheral side, and extends in the axial direction to the other end of the outer pipe 40.

この場合には、プロペラシャフトの内径のバラツキを周方向に分散して形成された膨出部４１によって吸収できるので、図７に記載のダイナミックダンパに比べると、圧入の安定性が増す。しかし、膨出部４１が突出した側（他端側）からアウタパイプ４０を圧入すると、圧入時の引っ掛かりが発生するという問題がある。また、膨出部４１がアウタパイプ４０の軸方向ほぼ全長に亘って形成されているので、プロペラシャフトとの軸方向の圧接長が長く、歪みが大きくなるとともに、圧入荷重も増大する。 In this case, the variation in the inner diameter of the propeller shaft can be absorbed by the bulging portion 41 formed by dispersing in the circumferential direction, so that the stability of the press-fitting is increased as compared with the dynamic damper shown in FIG. However, when the outer pipe 40 is press-fitted from the side from which the bulging portion 41 protrudes (the other end side), there is a problem that a catch at the time of press-fitting occurs. Further, since the bulging portion 41 is formed over substantially the entire length of the outer pipe 40 in the axial direction, the axial contact length with the propeller shaft is long, the distortion increases, and the press-fit load increases.

実開平４−２７２３８号公報Japanese Utility Model Publication No. 4-27238 特開平８−２９０７２２号公報JP-A-8-290722

そこで、本発明の目的は、プロペラシャフトの過大歪みをなくし、プロペラシャフトに対して安定して取り付けることができるプロペラシャフト用ダイナミックダンパを提供することにある。 Accordingly, an object of the present invention is to provide a dynamic damper for a propeller shaft that can eliminate the excessive distortion of the propeller shaft and can be stably attached to the propeller shaft.

前記目的を達成するため、本発明は、円筒状のアウタパイプと、前記アウタパイプの軸心に配置されたインナウエイトと、前記アウタパイプと前記インナウエイトとの間を弾性的に連結するマウントラバーとを備え、プロペラシャフトの中空部内に装着されるダイナミックダンパにおいて、前記アウタパイプは前記プロペラシャフトの内径より小さい外径を持つ円筒状の胴部を有し、前記胴部の軸方向両端部近傍に、半径方向外方へ突出する複数の突起部が周方向に間隔をあけて形成され、前記突起部から前記アウタパイプの軸方向先端に向けてテーパ状に絞られた絞り部が形成され、前記絞り部は全周に亘って連続しており、かつ絞り部の先端部外径は前記胴部の外径より小径であり、前記突起部の外径は前記プロペラシャフトの内径より大きく設定され、前記アウタパイプをプロペラシャフトに圧入したとき、前記突起部が変形してプロペラシャフトの中空部内壁に圧接することを特徴とするプロペラシャフト用ダイナミックダンパを提供する。 In order to achieve the above object, the present invention includes a cylindrical outer pipe, an inner weight disposed at the axial center of the outer pipe, and a mount rubber that elastically connects the outer pipe and the inner weight. In the dynamic damper mounted in the hollow portion of the propeller shaft, the outer pipe has a cylindrical body portion having an outer diameter smaller than the inner diameter of the propeller shaft, and in the radial direction near both axial end portions of the body portion. a plurality of projections projecting outward are formed at intervals in the circumferential direction, the narrowed portion is narrowed in a tapered shape from the protrusions toward the axial tip of the outer pipe is formed, the narrowed portion is all It is continuous over the periphery, and the leading end outer diameter of the throttle portion is smaller than the outer diameter of the body portion, the outer diameter of the protrusion than the inner diameter of said propeller shaft Is listening set, said when pressed into the propeller shaft outer pipe, providing a propeller dynamic damper shaft, characterized in that the pressure in the hollow inner wall of the propeller shaft and the projection is deformed.

従来のようにアウタパイプが単純な円筒形状の場合、アウタパイプの外径寸法を管理しても、プロペラシャフトの内径にバラツキがあると、アウタパイプをプロペラシャフトに安定して圧入できない。本発明では、アウタパイプの軸方向両端部近傍にプロペラシャフトの内径より大きな外径を持つ複数の突起部を周方向に間隔をあけて形成してあるため、アウタパイプをプロペラシャフトに圧入すると、突起部がプロペラシャフトの軸方向及び周方向に分散して圧接し、プロペラシャフトに過大歪みを発生させずにアウタパイプを安定して取り付けることができる。突起部よりアウタパイプの軸方向先端に向けてテーパ状に絞られた絞り部が形成されているので、アウタパイプの圧入開始時に引っ掛かりを防止できる。特に、絞り部はアウタパイプの軸方向両端部に形成されているので、アウタパイプに方向性がなく、どの方向からでもプロペラシャフトに圧入できる。 When the outer pipe has a simple cylindrical shape as in the conventional case, even if the outer diameter of the outer pipe is controlled, if the inner diameter of the propeller shaft varies, the outer pipe cannot be stably press-fitted into the propeller shaft. In the present invention, since a plurality of protrusions having outer diameters larger than the inner diameter of the propeller shaft are formed in the vicinity of both ends in the axial direction of the outer pipe at intervals in the circumferential direction, when the outer pipe is press-fitted into the propeller shaft, the protrusions Can be dispersed and pressed in the axial direction and the circumferential direction of the propeller shaft, and the outer pipe can be stably attached without causing excessive distortion in the propeller shaft. Since the narrowed portion is tapered from the protrusion toward the tip of the outer pipe in the axial direction, it is possible to prevent the outer pipe from being caught at the start of press-fitting of the outer pipe. In particular, since the throttle portions are formed at both ends in the axial direction of the outer pipe, the outer pipe has no directionality and can be press-fitted into the propeller shaft from any direction.

突起部の形成方法としては、例えばアウタパイプの両端部近傍に軸方向の複数のスリットを形成し、その中間部を半径方向外方へ山形に突き出し加工してもよいし、アウタパイプの両端部近傍に周方向に連続した拡径部を形成しておき、この拡径部に複数の窓孔を形成することによって、窓孔以外の部分を突起部として利用してもよい。 As a method of forming the protrusion, for example, a plurality of axial slits may be formed near both ends of the outer pipe, and the intermediate portion may be protruded into a mountain shape radially outward, or may be processed near both ends of the outer pipe. A portion having a diameter other than the window hole may be used as the protrusion by forming a continuously enlarged diameter portion in the circumferential direction and forming a plurality of window holes in the enlarged diameter portion.

以上のように、本発明にかかるダイナミックダンパによれば、アウタパイプの両端部に複数の突起部を周方向に間隔をあけて形成したので、アウタパイプをプロペラシャフトに圧入したとき、軸方向及び円周方向の一部にのみ歪みが発生するだけであり、過大歪みをなくすことができるとともに、圧入荷重を下げることができる。また、突起部はアウタパイプの両端部近傍に形成されるので、アウタパイプの傾きを防止できる。さらに、突起部よりアウタパイプの軸方向先端に向けてテーパ状に絞られた絞り部が形成されているため、どの方向からでもアウタパイプをプロペラシャフトに円滑に圧入できる。 As described above, according to the dynamic damper of the present invention, the plurality of protrusions are formed at both ends of the outer pipe at intervals in the circumferential direction, so that when the outer pipe is press-fitted into the propeller shaft, the axial direction and the circumference Strain is generated only in a part of the direction, so that excessive strain can be eliminated and the press-fit load can be reduced. Further, since the protrusion is formed in the vicinity of both end portions of the outer pipe, the inclination of the outer pipe can be prevented. Furthermore, since the narrowed portion is formed in a tapered shape from the protrusion toward the tip of the outer pipe in the axial direction, the outer pipe can be smoothly pressed into the propeller shaft from any direction.

以下に、本発明の実施の形態を、実施例を参照して説明する。 Embodiments of the present invention will be described below with reference to examples.

図１は本発明にかかるダイナミックダンパの一例をプロペラシャフトに取り付けた状態の断面図を示し、図２はダイナミックダンパの半断面図、図３は斜視図である。 FIG. 1 is a cross-sectional view of an example of a dynamic damper according to the present invention attached to a propeller shaft, FIG. 2 is a half cross-sectional view of the dynamic damper, and FIG. 3 is a perspective view.

本ダイナミックダンパ装置１は、図１〜図３に示すように、プロペラシャフト１０の中空部に挿入される円筒状のアウタパイプ２と、アウタパイプ２の軸心に配置された円柱状のインナウエイト３と、アウタパイプ２とインナウエイト３との間を弾性的に連結するマウントラバー４とを備えている。アウタパイプ２およびインナウエイト３は鋼材のような高強度の金属材料で形成されている。 As shown in FIGS. 1 to 3, the dynamic damper device 1 includes a cylindrical outer pipe 2 that is inserted into the hollow portion of the propeller shaft 10, and a columnar inner weight 3 that is disposed at the axial center of the outer pipe 2. , And a mounting rubber 4 that elastically connects the outer pipe 2 and the inner weight 3. The outer pipe 2 and the inner weight 3 are made of a high-strength metal material such as steel.

アウタパイプ２の軸方向中央部には円筒状の胴部２ａが形成されており、この胴部２ａの軸方向両端部近傍に、半径方向外方へ突出する複数の突起部２ｂが周方向に間隔をあけて形成されている。この実施例の突起部２ｂは、軸方向に一対のスリットを形成し、その中間部を半径方向外方へ山形に突き出し加工したものであり、軸方向両側面がテーパ状に傾斜している。アウタパイプ２の軸方向両端部には、軸方向先端に向けて漸次縮径するテーパ状の絞り部２ｃが全周に形成されている。絞り部２ｃのテーパ面は突起部２ｂの一方のテーパ状側面と連続している。突起部２ｂの外径Ｄａは、次式のようにプロペラシャフト１０の内径Ｄｐより大きく、アウタパイプ２をプロペラシャフト１０に圧入したとき、突起部２ｂが変形しうるように設定されている。
Ｄｐ＜Ｄａ A cylindrical body 2a is formed at the axial center of the outer pipe 2, and a plurality of protrusions 2b projecting outward in the radial direction are spaced in the circumferential direction near both axial ends of the body 2a. It is formed with a gap. The protruding portion 2b of this embodiment is formed by forming a pair of slits in the axial direction and projecting the intermediate portion in a mountain shape outward in the radial direction, and both side surfaces in the axial direction are inclined in a tapered shape. At both ends in the axial direction of the outer pipe 2, tapered throttle portions 2 c that gradually reduce in diameter toward the tip in the axial direction are formed on the entire circumference. The tapered surface of the narrowed portion 2c is continuous with one tapered side surface of the protruding portion 2b. The outer diameter Da of the protrusion 2b is larger than the inner diameter Dp of the propeller shaft 10 as shown in the following equation, and is set so that the protrusion 2b can be deformed when the outer pipe 2 is press-fitted into the propeller shaft 10.
Dp <Da

マウントラバー４は、アウタパイプ２の内周面とインナウエイト３の外周面とにそれぞれ加硫接着されている。マウントラバー４には、軸方向に貫通する複数の空洞部４ａが形成されている。この実施例では、９０°間隔で４個の空洞部４ａが形成されている。アウタパイプ２の内周面に接着されるマウントラバー４の外周部は、突起部２ｂの内周面より軸方向内側に入った位置で終端となっている。 The mount rubber 4 is vulcanized and bonded to the inner peripheral surface of the outer pipe 2 and the outer peripheral surface of the inner weight 3. The mount rubber 4 is formed with a plurality of cavities 4a penetrating in the axial direction. In this embodiment, four cavities 4a are formed at intervals of 90 °. The outer peripheral portion of the mount rubber 4 bonded to the inner peripheral surface of the outer pipe 2 terminates at a position entering the inner side in the axial direction from the inner peripheral surface of the protrusion 2b.

上述のような形状のアウタパイプ２をプロペラシャフト１０に圧入すると、アウタパイプ２の軸方向両端部にテーパ状の絞り部２ｃが形成されているので、円滑に圧入でき、アウタパイプ２を逆向きに圧入しても支障なく圧入できる。特に、絞り部２ｃから突起部２ｂにかけて連続したテーパ面であるため、圧入開始時の引っ掛かりや圧入途中の引っ掛かりを防止できる。アウタパイプ２を圧入する際、治具でアウタパイプ２の端面を押す必要があるが、上述のようにアウタパイプ２の軸方向両端部に絞り部２ｃが形成されているので、治具と接触する径が小さくなり、圧入作業が安定する。 When the outer pipe 2 having the shape as described above is press-fitted into the propeller shaft 10, since the tapered throttle portions 2c are formed at both ends in the axial direction of the outer pipe 2, the outer pipe 2 can be smoothly press-fitted and the outer pipe 2 is pressed in the opposite direction. It can be press-fitted without any problem. In particular, since the tapered surface is continuous from the narrowed portion 2c to the protruding portion 2b, it is possible to prevent catching at the start of press-fitting and catching during press-fitting. When the outer pipe 2 is press-fitted, it is necessary to press the end face of the outer pipe 2 with a jig. However, as described above, since the narrowed portions 2c are formed at both axial ends of the outer pipe 2, the diameter in contact with the jig is small. It becomes smaller and the press-fitting work becomes stable.

突起部２ｂの外径Ｄａがプロペラシャフト１０の内径Ｄｐより大きいので、アウタパイプ２を圧入すると、突起部２ｂの一部が変形しながらプロペラシャフト１０の中空部内壁に圧接する。しかし、突起部２ｂはアウタパイプ２の軸方向及び円周方向の一部のみに形成されているので、プロペラシャフト１０の歪みも部分的になり、過大歪みを防止できるとともに、圧入荷重を下げることができる。また、一般にプロペラシャフト１０は平板を円筒状に曲げ加工し、その合わせ部を溶接することにより形成されるが、内周面には合わせ部の溶接痕がビード状に残る。本実施例では、突起部２ｂが周方向に間隔をあけて形成されているので、プロペラシャフト１０の内面に形成される溶接痕を避けて圧入できる。 Since the outer diameter Da of the protruding portion 2b is larger than the inner diameter Dp of the propeller shaft 10, when the outer pipe 2 is press-fitted, a part of the protruding portion 2b is pressed against the inner wall of the hollow portion of the propeller shaft 10 while being deformed. However, since the projecting portion 2b is formed only in a part of the outer pipe 2 in the axial direction and the circumferential direction, the propeller shaft 10 is also partially distorted to prevent excessive distortion and to reduce the press-fit load. it can. In general, the propeller shaft 10 is formed by bending a flat plate into a cylindrical shape and welding the mating portion, but the weld trace of the mating portion remains in a bead shape on the inner peripheral surface. In the present embodiment, since the protrusions 2b are formed at intervals in the circumferential direction, press fitting can be performed while avoiding welding marks formed on the inner surface of the propeller shaft 10.

図４，図５は本発明にかかるダイナミックダンパの第２実施例を示す。第１実施例と同一部分には同一符号を付して重複説明を省略する。この実施例のダイナミックダンパ１Ａでは、アウタパイプ２の軸方向両端部近傍に周方向に連続した断面山形の拡径部２ｄを形成し、この拡径部２ｄに複数の窓孔２ｅを周方向に間隔をあけて形成することによって、窓孔以外の拡径部部分を突起部として利用したものである。拡径部２ｄの軸端側には、先端に向かって漸次縮径されたテーパ状の絞り部２ｆが形成されている。この実施例の場合も、拡径部２ｄの外径Ｄａをプロペラシャフト１０の内径より大きくすることで、拡径部２ｄがプロペラシャフト１０の中空部内壁に圧接するように設定してある。 4 and 5 show a second embodiment of the dynamic damper according to the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted. In the dynamic damper 1A of this embodiment, a radially enlarged portion 2d having a mountain-shaped cross section that is continuous in the circumferential direction is formed in the vicinity of both axial end portions of the outer pipe 2, and a plurality of window holes 2e are circumferentially spaced in the enlarged diameter portion 2d. By forming the gap, the enlarged diameter portion other than the window hole is used as the protrusion. On the shaft end side of the enlarged diameter portion 2d, a tapered throttle portion 2f that is gradually reduced in diameter toward the tip is formed. Also in this embodiment, the enlarged diameter portion 2d is set to be in pressure contact with the hollow portion inner wall of the propeller shaft 10 by making the outer diameter Da of the enlarged diameter portion 2d larger than the inner diameter of the propeller shaft 10.

この実施例のダイナミックダンパも、第１実施例と同様に、アウタパイプ２の軸方向両端部にテーパ状の絞り部２ｆが形成されているので、圧入開始時や圧入途中における引っ掛かりを防止できる。また、突起部（拡径部２ｄ）がアウタパイプ２の軸方向及び円周方向の一部に形成されているだけであるため、プロペラシャフトに過大歪みを発生させず、かつ圧入荷重を低くでき、圧入作業性が向上するという利点がある。 Similarly to the first embodiment, the dynamic damper of this embodiment is also formed with tapered throttle portions 2f at both axial ends of the outer pipe 2, so that it is possible to prevent catching at the start of press-fitting or during press-fitting. Further, since the protruding portion (expanded diameter portion 2d) is only formed in a part of the outer pipe 2 in the axial direction and the circumferential direction, it does not cause excessive distortion in the propeller shaft and can reduce the press-fit load. There is an advantage that press-fit workability is improved.

本発明にかかるダイナミックダンパの第１実施例をプロペラシャフトに装着した状態の断面図である。It is sectional drawing of the state with which the 1st Example of the dynamic damper concerning this invention was mounted | worn with the propeller shaft. 図１に示すダイナミックダンパの半断面図である。FIG. 2 is a half sectional view of the dynamic damper shown in FIG. 1. 図１に示すダイナミックダンパの斜視図である。It is a perspective view of the dynamic damper shown in FIG. 本発明にかかるダイナミックダンパの第２実施例の半断面図である。It is a half sectional view of the 2nd example of the dynamic damper concerning the present invention. 図４に示すダイナミックダンパの斜視図である。It is a perspective view of the dynamic damper shown in FIG. 従来のダイナミックダンパを装着したプロペラシャフトの一部を破断した側面図である。It is the side view which fractured | ruptured a part of propeller shaft with which the conventional dynamic damper was mounted | worn. 従来のダイナミックダンパの一例の断面図である。It is sectional drawing of an example of the conventional dynamic damper. 従来のダイナミックダンパの他の例の断面図および側面図である。It is sectional drawing and the side view of the other example of the conventional dynamic damper.

符号の説明Explanation of symbols

１，１Ａ ダイナミックダンパ
２ アウタパイプ
２ａ 胴部
２ｂ 突起部
２ｃ 絞り部
２ｄ 拡径部
２ｅ 窓孔
２ｆ 絞り部
３ インナウエイト
４ マウントラバー
１０ プロペラシャフト DESCRIPTION OF SYMBOLS 1,1A Dynamic damper 2 Outer pipe 2a Body part 2b Projection part 2c Restriction part 2d Expanded diameter part 2e Window hole 2f Restriction part 3 Inner weight 4 Mount rubber 10 Propeller shaft

Claims (1)

円筒状のアウタパイプと、前記アウタパイプの軸心に配置されたインナウエイトと、前記アウタパイプと前記インナウエイトとの間を弾性的に連結するマウントラバーとを備え、プロペラシャフトの中空部内に装着されるダイナミックダンパにおいて、
前記アウタパイプは前記プロペラシャフトの内径より小さい外径を持つ円筒状の胴部を有し、
前記胴部の軸方向両端部近傍に、半径方向外方へ突出する複数の突起部が周方向に間隔をあけて形成され、
前記突起部から前記アウタパイプの軸方向先端に向けてテーパ状に絞られた絞り部が形成され、
前記絞り部は全周に亘って連続しており、かつ絞り部の先端部外径は前記胴部の外径より小径であり、
前記突起部の外径は前記プロペラシャフトの内径より大きく設定され、前記アウタパイプをプロペラシャフトに圧入したとき、前記突起部が変形してプロペラシャフトの中空部内壁に圧接することを特徴とするプロペラシャフト用ダイナミックダンパ。 A dynamic outer cylinder having a cylindrical outer pipe, an inner weight disposed at the axial center of the outer pipe, and a mount rubber for elastically connecting the outer pipe and the inner weight, and mounted in a hollow portion of the propeller shaft In the damper,
The outer pipe has a cylindrical body having an outer diameter smaller than the inner diameter of the propeller shaft,
A plurality of protrusions protruding outward in the radial direction are formed at intervals in the circumferential direction in the vicinity of both axial ends of the body portion ,
A constricted portion that is constricted in a tapered shape is formed from the protruding portion toward the distal end in the axial direction of the outer pipe,
The throttle part is continuous over the entire circumference, and the outer diameter of the tip part of the throttle part is smaller than the outer diameter of the body part,
The outer diameter of the projecting portion is set larger than the inner diameter of the propeller shaft, and when the outer pipe is press-fitted into the propeller shaft, the projecting portion is deformed and press-contacted to the inner wall of the hollow portion of the propeller shaft. Dynamic damper.
JP2007230889A 2007-09-06 2007-09-06 Dynamic damper for propeller shaft Expired - Fee Related JP5084410B2 (en)

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JP6056784B2 (en) * 2014-02-12 2017-01-11 マツダ株式会社 Engine piston structure
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JPS5337182Y2 (en) * 1973-05-15 1978-09-08
JPH0425480Y2 (en) * 1986-08-28 1992-06-18
JP3507559B2 (en) * 1994-09-16 2004-03-15 株式会社日立ユニシアオートモティブ Shaft damping device
JP3753191B2 (en) * 1995-04-24 2006-03-08 株式会社ショーワ Propeller shaft dynamic damper mounting structure

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