JP2018003928A - Torsional damper - Google Patents

Torsional damper Download PDF

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JP2018003928A
JP2018003928A JP2016129671A JP2016129671A JP2018003928A JP 2018003928 A JP2018003928 A JP 2018003928A JP 2016129671 A JP2016129671 A JP 2016129671A JP 2016129671 A JP2016129671 A JP 2016129671A JP 2018003928 A JP2018003928 A JP 2018003928A
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hub
pulley
elastic body
torsional damper
pulley body
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植草　裕之
Hiroyuki Uekusa
裕之 植草
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Nok Corp
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Nok Corp
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Abstract

PROBLEM TO BE SOLVED: To improve durability of torsional damper configured such that a width in an axis direction of an elastic body 3 is larger than a width in an axis direction of a pulley body 2.SOLUTION: A torsional damper includes a hub 1 attached to a rotational shaft, an annular pulley body 2 arranged on an outer peripheral side of the hub 1, an elastic body 3 press-fitted between the hub 1 and the pulley body 2 and comprising a rubber-like elastic material, and a slide bearing 4 interposed between the hub 1 and the pulley body 2 and capable of sliding the hub 1 and the pulley body 2. The slide bearing 4 is formed with a ventilation groove 4a penetrating in an axial direction.SELECTED DRAWING: Figure 1

Description

本発明は、自動車エンジンのクランクシャフト等に取り付けられるプーリに具備されるトーショナルダンパに関する。   The present invention relates to a torsional damper provided in a pulley attached to a crankshaft or the like of an automobile engine.

自動車エンジンのクランクシャフトの端部に取り付けられるプーリは、エンジンの駆動に伴ってクランクシャフトに生じる捩り振動（回転方向の振動）を低減する機能を奏するトーショナルダンパを具備している。   A pulley attached to an end of a crankshaft of an automobile engine includes a torsional damper that has a function of reducing torsional vibration (vibration in the rotational direction) generated in the crankshaft as the engine is driven.

図３に示すトーショナルダンパ１００は、不図示のクランクシャフトの端部に取り付けられるハブ１１０と、このハブ１１０の外周側に同心的に配置されたプーリ本体１２０と、これらハブ１１０とプーリ本体１２０との間に圧入嵌着されたゴム状弾性材料（ゴム材料又はゴム状弾性を有する合成樹脂材料）からなる弾性体１３０とを備える。そしてこのトーショナルダンパ１００は、プーリ本体１２０に巻き掛けられた不図示のベルトを介して、クランクシャフトの駆動力を補機へ伝達するためのプーリとして機能するほか、クランクシャフトの捩り振幅が最大となる所定の振動周波数域において、捩り方向に加振されることによって弾性体１３０とプーリ本体１２０を含むばね−質量系が共振し、その振動変位によるトルクが入力振動によるトルクと逆方向へ生じることによって、動的吸振機能を発揮するものである（例えば下記の先行技術文献参照）。   A torsional damper 100 shown in FIG. 3 includes a hub 110 attached to an end portion of a crankshaft (not shown), a pulley body 120 concentrically disposed on the outer peripheral side of the hub 110, and the hub 110 and the pulley body 120. And an elastic body 130 made of a rubber-like elastic material (rubber material or synthetic resin material having rubber-like elasticity) press-fitted between the two. The torsional damper 100 functions as a pulley for transmitting the driving force of the crankshaft to the auxiliary machine via a belt (not shown) wound around the pulley body 120, and has a maximum torsional amplitude of the crankshaft. In the predetermined vibration frequency range, the spring-mass system including the elastic body 130 and the pulley body 120 resonates by being vibrated in the torsional direction, and the torque due to the vibration displacement is generated in the opposite direction to the torque due to the input vibration. Thus, a dynamic vibration absorbing function is exhibited (for example, see the following prior art document).

特開２００１−２６３４２３号公報JP 2001-263423 A

この種のトーショナルダンパ１００には、エンジン周囲のレイアウト等の条件によって、図示の例のように、弾性体１３０の軸方向幅よりもプーリ本体１２０の軸方向幅のほうが大きく、かつプーリ本体１２０の幅方向中央が弾性体１３０の幅方向中央に対して背面側へずれた仕様のものがある。そしてこのように設計されたものの場合、プーリ本体１２０に巻き掛けられたベルトの張力が、弾性体１３０によるプーリ本体１２０の支持位置より背面側へ偏って作用することになる。このため図４に示すように、プーリ本体１２０がクランクシャフト（ハブ１１０）に対して傾斜して、ハブ１１０とプーリ本体１２０との間に嵌着された弾性体１３０に１回転ごとに繰り返される圧縮変形が局部的に増大し、したがって弾性体１３０の発熱量や摩耗が増大する懸念がある。   In this type of torsional damper 100, the axial width of the pulley main body 120 is larger than the axial width of the elastic body 130 and the pulley main body 120 is larger than the axial width of the elastic body 130, as shown in the example, depending on conditions such as the layout around the engine. There is a specification in which the center in the width direction is shifted to the back side with respect to the center in the width direction of the elastic body 130. And in the case of what was designed in this way, the tension of the belt wound around the pulley body 120 acts on the back side from the position where the pulley body 120 is supported by the elastic body 130. Therefore, as shown in FIG. 4, the pulley main body 120 is inclined with respect to the crankshaft (hub 110), and is repeated every rotation on the elastic body 130 fitted between the hub 110 and the pulley main body 120. There is a concern that the compressive deformation is locally increased, and thus the heat generation amount and wear of the elastic body 130 are increased.

本発明は、以上のような点に鑑みてなされたものであって、その技術的課題は、弾性体の軸方向幅よりもプーリ本体の軸方向幅のほうが大きい仕様のトーショナルダンパの耐久性を向上させることにある。   The present invention has been made in view of the above points, and its technical problem is the durability of the torsional damper having a specification in which the axial width of the pulley body is larger than the axial width of the elastic body. Is to improve.

上述した技術的課題を解決するための手段として、請求項１に係るトーショナルダンパは、回転軸に取り付けられるハブと、前記ハブの外周側に配置された環状のプーリ本体と、前記ハブと前記プーリ本体との間に圧入されたゴム状弾性材料からなる弾性体と、前記ハブと前記プーリ本体の間に介装されると共に前記ハブ又は前記プーリ本体と摺動可能な滑り軸受を備え、前記滑り軸受に、軸方向へ貫通した通気溝が形成されたことを特徴とするものである。なお、ここでいうゴム状弾性材料とは、ゴム材料又はゴム状弾性を有する合成樹脂材料のことである。   As a means for solving the above-described technical problem, a torsional damper according to claim 1 includes a hub attached to a rotating shaft, an annular pulley body disposed on an outer peripheral side of the hub, the hub, and the hub. An elastic body made of a rubber-like elastic material press-fitted between the pulley body, a sliding bearing interposed between the hub and the pulley body and slidable with the hub or the pulley body, The sliding bearing is formed with a ventilation groove penetrating in the axial direction. The rubber-like elastic material here is a rubber material or a synthetic resin material having rubber-like elasticity.

また、請求項２の発明に係るトーショナルダンパは、請求項１に記載された構成において、滑り軸受が、金属の基材に固体潤滑剤層を形成した材料からなり、前記固体潤滑剤層の表面をハブ又はプーリ本体との摺動面としたことを特徴とするものである。   A torsional damper according to a second aspect of the present invention is the torsional damper according to the first aspect, wherein the sliding bearing is made of a material in which a solid lubricant layer is formed on a metal base material. The surface is a sliding surface with a hub or a pulley body.

本発明に係るトーショナルダンパによれば、ベルトの張力が作用するプーリ本体の軸方向幅が弾性体の軸方向幅より大きい仕様であっても、滑り軸受によってプーリ本体の傾斜が抑制され、このため弾性体の局部圧縮が抑制され、しかも滑り軸受の通気溝を通じて弾性体と滑り軸受の間の空間に空気の流通が促されるため、弾性体が空冷され、その耐久性を向上させることができる。   According to the torsional damper according to the present invention, even if the axial width of the pulley body on which the belt tension acts is larger than the axial width of the elastic body, the inclination of the pulley body is suppressed by the sliding bearing. Therefore, the local compression of the elastic body is suppressed, and further, air flow is promoted to the space between the elastic body and the sliding bearing through the ventilation groove of the sliding bearing, so that the elastic body is cooled by air and the durability thereof can be improved. .

本発明に係るトーショナルダンパの好ましい実施の形態を、軸心を通る平面で切断して示す断面図である。It is sectional drawing which cut | disconnects and shows preferable embodiment of the torsional damper which concerns on this invention by the plane which passes along an axial center. 本発明に係るトーショナルダンパの好ましい実施の形態を、軸心を通る平面で切断して示す部分的な断面斜視図である。1 is a partial cross-sectional perspective view showing a preferred embodiment of a torsional damper according to the present invention by cutting along a plane passing through an axis. 背景技術に係るトーショナルダンパの一例を、軸心を通る平面で切断して示す半断面図である。FIG. 6 is a half cross-sectional view showing an example of a torsional damper according to the background art cut along a plane passing through an axis. 背景技術に係るトーショナルダンパの一例において、プーリ本体が傾斜した状態を、軸心を通る平面で切断して示す半断面図である。In an example of the torsional damper which concerns on background art, it is a half sectional view which cut | disconnects and shows the state which the pulley main body inclined in the plane which passes along an axial center.

以下、本発明に係るトーショナルダンパの好ましい実施の形態について、図１及び図２を参照しながら説明する。なお、以下の説明において「正面側」とは、図１における左側であって車両のフロント側のことであり、「背面側」とは図１における右側であって不図示のエンジンが存在する側のことである。   Hereinafter, preferred embodiments of the torsional damper according to the present invention will be described with reference to FIGS. 1 and 2. In the following description, the “front side” is the left side in FIG. 1 and the front side of the vehicle, and the “rear side” is the right side in FIG. 1 and the side where the engine (not shown) exists. That's it.

このトーショナルダンパは、不図示のエンジンのクランクシャフトの端部に取り付けられるハブ１と、このハブ１の外周側に同心的かつ相対変位可能な状態で配置された環状のプーリ本体２と、ハブ１とプーリ本体２との間に圧入された環状の弾性体３と、ハブ１とプーリ本体２の間に介在し、プーリ本体２の内周面に嵌着されると共にハブ１の外周面と摺動可能に接触される滑り軸受４とを備える。   The torsional damper includes a hub 1 attached to an end of an engine crankshaft (not shown), an annular pulley body 2 disposed concentrically and relatively displaceably on the outer peripheral side of the hub 1, a hub 1 and an annular elastic body 3 press-fitted between the pulley main body 2 and the hub 1 and the pulley main body 2. The elastic body 3 is fitted on the inner peripheral surface of the pulley main body 2 and the outer peripheral surface of the hub 1. And a sliding bearing 4 that is slidably contacted.

ハブ１は金属材料の鋳造等により製作されたものであって、クランクシャフトの軸端への固定部である軸孔１１ａ及びキー溝１１ｂが形成された内周筒部１１と、この内周筒部１１から外径側へ展開した径方向部１２と、この径方向部１２の外径端から軸方向に延びる外周筒部１３とを備え、径方向部１２には複数の開口部１２ａが円周方向等間隔で開設され、外周筒部１３の外周面には、弾性体３と嵌着された嵌着面１３ａと、この嵌着面１３ａの背面側に位置し滑り軸受４を摺動可能に支持する軸受支持面１３ｂが形成されている。   The hub 1 is manufactured by casting a metal material or the like. The hub 1 is an inner peripheral cylinder portion 11 having a shaft hole 11a and a key groove 11b that are fixed to the shaft end of the crankshaft, and the inner peripheral cylinder. The radial direction part 12 which spread | deployed from the part 11 to the outer-diameter side, and the outer peripheral cylinder part 13 extended in an axial direction from the outer-diameter end of this radial direction part 12 are provided, and several opening part 12a is circular in the radial direction part 12. Established at equal intervals in the circumferential direction, the outer peripheral surface of the outer cylindrical portion 13 is fitted on the fitting surface 13a fitted with the elastic body 3, and the sliding bearing 4 is slidable on the back side of the fitting surface 13a. A bearing support surface 13b is formed for support.

プーリ本体２も金属材料の鋳造等により製作されたものであって、ハブ１における外周筒部１３の軸方向幅と略同等の軸方向幅を有し、内周面には、弾性体３と嵌着された嵌着面２ａと、この嵌着面２ａの背面側に位置し滑り軸受４が圧入嵌着された軸受保持面２ｂが形成され、外周面には、その正面側の端部から背面側の端部にかけて、不図示のベルトを巻き掛けるためのポリＶ溝２ｃ，２ｄが形成されている。   The pulley body 2 is also manufactured by casting a metal material or the like, and has an axial width substantially equal to the axial width of the outer peripheral cylindrical portion 13 in the hub 1. A fitting surface 2a that is fitted and a bearing holding surface 2b that is located on the back side of the fitting surface 2a and in which the sliding bearing 4 is press-fitted and fitted are formed. Poly V grooves 2c and 2d for winding a belt (not shown) are formed on the rear side end.

弾性体３は、ゴム状弾性材料によって環状に成形された後、ハブ１の外周筒部１３の外周面のうち正面側寄りに形成された嵌着面１３ａと、これに径方向に対向するプーリ本体２の嵌着面２ａとの間に、軸方向一側（正面側）から圧入され、所要の圧縮代をもって嵌着されたものである。このため、弾性体３は、ハブ１の外周筒部１３の外周面とプーリ本体２の内周面との間のうち、正面側へ偏在する位置に介在しており、すなわちプーリ本体２の軸方向幅は弾性体３の軸方向幅よりも大きく、プーリ本体２の幅方向中央が弾性体３の幅方向中央より背面側へずれており、言い換えれば、ポリＶ溝２ｃ，２ｄのうち背面寄りのポリＶ溝２ｄは、弾性体３の嵌着位置よりも背面側へずれた位置にある。   The elastic body 3 is formed in a ring shape by a rubber-like elastic material, and then a fitting surface 13a formed on the front side of the outer peripheral surface of the outer peripheral cylindrical portion 13 of the hub 1 and a pulley radially opposed thereto. Between the fitting surface 2a of the main body 2, it is press-fitted from one side (front side) in the axial direction and is fitted with a required compression allowance. For this reason, the elastic body 3 is interposed between the outer peripheral surface of the outer peripheral cylindrical portion 13 of the hub 1 and the inner peripheral surface of the pulley body 2 at a position unevenly distributed to the front side, that is, the shaft of the pulley body 2. The width in the direction is larger than the axial width of the elastic body 3, and the center in the width direction of the pulley body 2 is shifted to the back side from the center in the width direction of the elastic body 3. In other words, of the poly V grooves 2c and 2d The poly V groove 2d is in a position shifted to the back side from the fitting position of the elastic body 3.

また、互いに対向する外周筒部１３及びプーリ本体２の嵌着面１３ａ，２ａは、軸方向への滑りによるプーリ本体２及び弾性体３の脱落を防止するために、径方向へ緩やかにうねった形状となっている。このため、弾性体３は径方向へうねった状態でハブ１の外周筒部１３とプーリ本体２の間に介在している。   Further, the outer peripheral cylindrical portion 13 and the fitting surfaces 13a, 2a of the pulley main body 2 opposed to each other gently wavy in the radial direction in order to prevent the pulley main body 2 and the elastic body 3 from falling off due to slippage in the axial direction. It has a shape. For this reason, the elastic body 3 is interposed between the outer peripheral cylindrical portion 13 of the hub 1 and the pulley body 2 in a state of undulating in the radial direction.

滑り軸受４は、金属の基材に固体潤滑剤層を形成した材料、詳しくは、ＳＰ鋼材等の金属からなる環状の基材の内周面に青銅焼結層を介して充填剤入りフッ素樹脂層からなる固体潤滑剤層を形成した３層構造の複合材料からなるものであって、基材の外周面がプーリ本体２の軸受保持面２ｂに圧入嵌着され、固体潤滑剤層からなる内周面がハブ１の外周筒部１３における軸受支持面１３ｂに摺動可能に接触されるものである。   The sliding bearing 4 is a material in which a solid lubricant layer is formed on a metal base material, and more specifically, a fluororesin containing filler via a bronze sintered layer on the inner peripheral surface of an annular base material made of metal such as SP steel. The solid lubricant layer is made of a composite material having a three-layer structure, and the outer peripheral surface of the base material is press-fitted into the bearing holding surface 2b of the pulley body 2, and the solid lubricant layer The peripheral surface is slidably contacted with the bearing support surface 13 b in the outer peripheral cylindrical portion 13 of the hub 1.

また、滑り軸受４の内周面には、軸方向へ貫通した複数の通気溝４ａが円周方向等間隔で形成されている。このため、ハブ１の外周筒部１３、プーリ本体２、弾性体３、及び滑り軸受４によって囲まれた環状空間Ｓは、通気溝４ａを介して当該トーショナルダンパの背面側の空間と連通している。   A plurality of ventilation grooves 4 a penetrating in the axial direction are formed on the inner peripheral surface of the slide bearing 4 at equal intervals in the circumferential direction. For this reason, the annular space S surrounded by the outer peripheral cylindrical portion 13, the pulley body 2, the elastic body 3, and the sliding bearing 4 of the hub 1 communicates with the space on the back side of the torsional damper via the ventilation groove 4a. ing.

以上の構成を備えるトーショナルダンパは、ハブ１の内周筒部１１の軸孔１１ａにおいて、不図示のボルト及びキーによってクランクシャフトの端部に固定され、エンジンの駆動状態においてこのクランクシャフトと共に回転されるものであって、プーリ本体２に巻き掛けられた不図示のベルトを介して、クランクシャフトの駆動力を補機へ伝達するためのプーリとして機能するほか、クランクシャフトの捩り振動を弾性体３の円周方向剪断変形によって吸収し、また、クランクシャフトの捩り振幅が極大となる周波数帯域において、プーリ本体２と弾性体３によって構成されるばね−質量系が共振し、その振動変位によるトルクが入力振動のトルクと逆方向に生じることによって、クランクシャフトの捩り振動のピークを有効に低減する動的吸振機能を発揮するものである。   The torsional damper having the above configuration is fixed to the end of the crankshaft by an unillustrated bolt and key in the shaft hole 11a of the inner peripheral cylinder portion 11 of the hub 1, and rotates together with this crankshaft in the engine drive state. In addition to functioning as a pulley for transmitting the driving force of the crankshaft to the auxiliary machine via a belt (not shown) wound around the pulley body 2, the torsional vibration of the crankshaft is an elastic body. The spring-mass system constituted by the pulley body 2 and the elastic body 3 resonates in the frequency band in which the torsional amplitude of the crankshaft is maximized, and is absorbed by the circumferential shear deformation of the crankshaft. Is generated in a direction opposite to the torque of the input vibration, effectively reducing the peak of the torsional vibration of the crankshaft. It is intended to exhibit the vibration absorbing function.

そして上記構成によれば、プーリ本体２の軸方向幅が弾性体３の軸方向幅よりも大きく、かつプーリ本体２の幅方向中央が弾性体３の幅方向中央より背面側へずれているため、プーリ本体２の背面寄りのポリＶ溝２ｄに巻き掛けられたベルトの張力が、弾性体３によるプーリ本体２の支持位置より背面側へ偏って作用するが、弾性体３の背面側には滑り軸受４が配置されており、プーリ本体２における背面側の端部近傍が、ハブ１の外周筒部１３の外周面における背面側の端部近傍の軸受支持面１３ｂに摺動可能に接触する滑り軸受４によって、ハブ１の外周筒部１３と略同心に支持されることから、クランクシャフト（ハブ１）に対するプーリ本体２の傾斜、ひいては弾性体３の局部的な圧縮変形の増大が有効に防止される。   And according to the said structure, since the axial direction width | variety of the pulley main body 2 is larger than the axial direction width | variety of the elastic body 3, and the width direction center of the pulley main body 2 has shifted | deviated from the width direction center of the elastic body 3 to the back side. The tension of the belt wound around the poly V groove 2d close to the back surface of the pulley body 2 acts on the back side from the support position of the pulley body 2 by the elastic body 3. The sliding bearing 4 is arranged, and the vicinity of the rear end portion of the pulley body 2 is slidably contacted with the bearing support surface 13 b in the vicinity of the rear end portion of the outer peripheral surface of the outer peripheral cylindrical portion 13 of the hub 1. Since the slide bearing 4 is supported substantially concentrically with the outer peripheral cylinder portion 13 of the hub 1, the inclination of the pulley body 2 with respect to the crankshaft (hub 1), and thus the increase in local compressive deformation of the elastic body 3 is effective. Is prevented.

特に、滑り軸受４は、ＳＰ鋼材等の金属からなる環状の基材の内周面に青銅焼結層を介して充填剤入りフッ素樹脂層からなる固体潤滑剤層を形成した材料からなることによって、径方向の圧縮荷重に対する剛性が高く、したがって弾性体３の局部的な圧縮変形の増大による発熱量や摩耗の増大を防止することができる。   In particular, the sliding bearing 4 is made of a material in which a solid lubricant layer made of a filled fluororesin layer is formed on the inner peripheral surface of an annular base material made of metal such as SP steel material via a bronze sintered layer. The rigidity against the compressive load in the radial direction is high, and therefore it is possible to prevent an increase in heat generation and wear due to an increase in local compressive deformation of the elastic body 3.

また、上記構成によれば、滑り軸受４の内周面に円周方向等間隔で形成され軸方向へ貫通した複数の通気溝４ａが、ハブ１の外周筒部１３、プーリ本体２、弾性体３、及び滑り軸受４によって囲まれた環状空間Ｓを背面側の空間に開放しているため、通気溝４ａを介して環状空間Ｓに外部の空気が流通しやすくなる。したがって、弾性体３に摩耗が発生しても、その摩耗粉を、通気溝４ａを介して外部へ排出することができる。   Moreover, according to the said structure, the some ventilation groove | channel 4a formed in the internal peripheral surface of the slide bearing 4 at the circumferential direction equal intervals and penetrated to the axial direction is the outer peripheral cylinder part 13 of the hub 1, the pulley main body 2, and an elastic body. 3 and the annular space S surrounded by the sliding bearing 4 are opened to the space on the back side, so that external air easily flows through the annular space S through the ventilation groove 4a. Therefore, even if wear occurs in the elastic body 3, the wear powder can be discharged to the outside through the ventilation groove 4a.

ここで、弾性体３は、運動エネルギを熱エネルギに変換することによって捩り振動を吸収・減衰するものであり、言い換えれば、弾性体３は捩り振動の入力を受けて反復変形するのに伴い内部摩擦によって発熱するが、環状空間Ｓ内では、遠心力によって、相対的に低温で高比重の空気が外周側、弾性体３の熱によって相対的に高温かつ低比重となった空気が内周側となるため、弾性体３から発生した熱が効率よく排出され、熱の蓄積による弾性体３の劣化を有効に抑制できる。   Here, the elastic body 3 absorbs and dampens torsional vibration by converting kinetic energy into heat energy. In other words, the elastic body 3 receives the input of torsional vibration and repeatedly undergoes internal deformation. Although heat is generated by friction, in the annular space S, air having a relatively low temperature and high specific gravity due to centrifugal force is on the outer peripheral side, and air having a relatively high temperature and low specific gravity due to the heat of the elastic body 3 is on the inner peripheral side. Therefore, heat generated from the elastic body 3 is efficiently discharged, and deterioration of the elastic body 3 due to heat accumulation can be effectively suppressed.

また、滑り軸受４は弾性体３の背面側に位置し、滑り軸受４に形成された通気溝４ａはトーショナルダンパとその背面側のエンジンとの間の狭い空間へ開口しているため、外部のダスト等が通気溝４ａを通じて滑り軸受４の摺動面へ浸入するのを抑制できる。   Further, the sliding bearing 4 is located on the back side of the elastic body 3, and the ventilation groove 4a formed in the sliding bearing 4 is open to a narrow space between the torsional damper and the engine on the back side. Can be prevented from entering the sliding surface of the sliding bearing 4 through the ventilation groove 4a.

さらに、上述のように滑り軸受４によってプーリ本体２に対する支持力を向上させて弾性体３の局部的な圧縮変形を抑制することができる結果、弾性体３の軸方向幅を減少させることができ、このためプーリ本体２と弾性体３によって構成されるばね−質量系の共振周波数を、例えばアイドル振動の周波数よりも低周波域に設定して、防振領域を低周波側へ拡大することができる。   Further, as described above, the sliding bearing 4 can improve the supporting force with respect to the pulley main body 2 to suppress the local compressive deformation of the elastic body 3, so that the axial width of the elastic body 3 can be reduced. Therefore, for example, the resonance frequency of the spring-mass system constituted by the pulley body 2 and the elastic body 3 can be set to a lower frequency range than the frequency of idle vibration, for example, and the vibration isolation region can be expanded to the lower frequency side. it can.

なお、通気溝４ａは、滑り軸受４の内周面と外周面に円周方向交互に形成しても良い。このようにすれば、環状空間Ｓ内の空気に作用する遠心力によって、昇温した環状空間Ｓ内の空気が外周側の通気溝から外部へ流出し、内周側の通気溝から外部の空気が環状空間Ｓ内へ流入するといった空気の流通が顕著に行われるので、放熱性の向上が期待できる。   The ventilation grooves 4a may be alternately formed in the circumferential direction on the inner peripheral surface and the outer peripheral surface of the sliding bearing 4. In this way, the heated air in the annular space S flows out from the outer ventilation groove by the centrifugal force acting on the air in the annular space S, and the outside air flows from the inner ventilation groove. Since air flows such that the air flows into the annular space S, the heat dissipation can be improved.

１ ハブ
１３ 外周筒部
１３ｂ 軸受支持面
２ プーリ本体
３ 弾性体
４ 滑り軸受
４ａ 通気溝 DESCRIPTION OF SYMBOLS 1 Hub 13 Outer peripheral cylinder part 13b Bearing support surface 2 Pulley main body 3 Elastic body 4 Sliding bearing 4a Ventilation groove

Claims (2)

回転軸に取り付けられるハブと、前記ハブの外周側に配置された環状のプーリ本体と、前記ハブと前記プーリ本体との間に圧入されたゴム状弾性材料からなる弾性体と、前記ハブと前記プーリ本体の間に介装されると共に前記ハブ又は前記プーリ本体と摺動可能な滑り軸受を備え、前記滑り軸受に、軸方向へ貫通した通気溝が形成されたことを特徴とするトーショナルダンパ。   A hub attached to a rotary shaft; an annular pulley body disposed on an outer peripheral side of the hub; an elastic body made of a rubber-like elastic material press-fitted between the hub and the pulley body; the hub and the hub A torsional damper comprising a sliding bearing interposed between pulley bodies and slidable with the hub or the pulley body, wherein the sliding bearing has a ventilation groove penetrating in an axial direction. . 滑り軸受が、金属の基材に固体潤滑剤層を形成した材料からなり、前記固体潤滑剤層の表面をハブ又はプーリ本体との摺動面としたことを特徴とする請求項１に記載のトーショナルダンパ。   The sliding bearing is made of a material in which a solid lubricant layer is formed on a metal base material, and the surface of the solid lubricant layer is used as a sliding surface with a hub or a pulley body. Torsional damper.
JP2016129671A 2016-06-30 2016-06-30 Torsional damper Pending JP2018003928A (en)

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