JP2009275608A - Vibration isolator of air fan and air fan structure equipped with the same - Google Patents

Vibration isolator of air fan and air fan structure equipped with the same Download PDF

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JP2009275608A
JP2009275608A JP2008127891A JP2008127891A JP2009275608A JP 2009275608 A JP2009275608 A JP 2009275608A JP 2008127891 A JP2008127891 A JP 2008127891A JP 2008127891 A JP2008127891 A JP 2008127891A JP 2009275608 A JP2009275608 A JP 2009275608A
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outer cylinder
inner cylinder
elastic member
cylinder
extending portion
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JP4928500B2 (en
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Takashi Kawai
孝 河合
Haruyoshi Iwai
晴義 岩井
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NIPPON KOBUNSHI KK
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration isolator of an air fan achieving compatibility between vibration isolation performance improvement and durability performance improvement without cost increase, and an air fan structure equipped with the vibration isolator. <P>SOLUTION: In the vibration isolator of the air fan having an inner tube, an outer tube 12, and an elastic member for integrally connecting them, axially extended portions 11p projecting radially outwardly from the inner tube 11 are spaced in a circumferential direction θ on an inner tube outer peripheral surface 11f, whereas axially extended portions 12p projecting radially inwardly from the outer tube 12 are spaced in the circumferential direction θ on an outer tube inner peripheral surface 12f, and their respective distal ends e31 and e12 are overlapped with each other. Circumferentially extended portions 22f and 31f are disposed on the inner tube outer peripheral surface 11f and the outer tube inner peripheral surface 12f, respectively, and their respective distal ends e22 and ef are overlapped with each other to form a continuous space R3 having half-closed regions A<SB>x</SB>and A<SB>y</SB>along an axis O<SB>M</SB>direction and the circumferential direction θ between the inner tube 11 and the outer tube 12, and the elastic member is disposed in the continuous space R3. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、いわゆる、エアコン(エアコンディショナー)等の空気調和機やエレクトロニクス機器等に装備される送風用ファンの防振具及びそれを備える送風用ファン構造体に関するものである。   The present invention relates to a vibration isolator for a blower fan installed in an air conditioner such as an air conditioner (air conditioner), an electronic device, and the like, and a blower fan structure including the same.

モータで送風用ファンを回転させる際に騒音や振動を発生することは周知であり、こうした騒音や振動を抑制する手段として、内筒及び外筒の間を弾性部材で一体に連結した防振具を用いることも既知である(例えば、特許文献1参照)。
特開平9−228993号公報
It is well known that noise and vibration are generated when a fan is rotated by a motor, and as a means for suppressing such noise and vibration, a vibration isolator is integrally connected between an inner cylinder and an outer cylinder by an elastic member. Is also known (see, for example, Patent Document 1).
JP-A-9-228993

しかしながら、こうした従来の防振具は、騒音や振動を弾性部材の変形及び復元で吸収するため、弾性部材の耐久性が結果的に防振具の耐久性に直結するにも関わらず、何らの対策も施されていなかった。   However, since such conventional vibration isolator absorbs noise and vibration by deformation and restoration of the elastic member, no matter what the durability of the elastic member is directly linked to the durability of the vibration isolator as a result, No measures were taken.

そこで、本願発明者は、防振具の耐久性の向上を図るべく、弾性部材に着目して様々な試験・研究を繰り返した。   Therefore, the inventor of the present application has repeated various tests and researches focusing on the elastic member in order to improve the durability of the vibration isolator.

その結果、本願発明者は、弾性部材の耐久性が、モータに代表される駆動源から入力される振動や回転トルク、送風用ファンの自重及び遠心力、加えて、風圧、温度等の経時的な環境変化に対しても考慮する必要があり、これらが複雑に関与することから、従来の防振具では、個々の送風系統の構造、構成物の違いに応じて、その都度、対策する必要があることを認識するに至った。   As a result, the present inventor has found that the durability of the elastic member is such that the vibration and rotational torque input from the drive source represented by the motor, the self-weight and centrifugal force of the blower fan, as well as the wind pressure and temperature over time. It is necessary to consider various environmental changes, and since these are involved in a complicated manner, conventional anti-vibration devices need to take countermeasures each time depending on the structure and components of each blower system. It came to recognize that there is.

例えば、エアコン室外機のプロペラファンに代表される軸流ファンの場合、運転時の防振具には主に回転トルクや遠心力が作用するが、停止時には送風用ファンの自重による一定方向(自重方向)に負荷がかかるのに加え、温度、湿度、オゾンや紫外線等の環境負荷も加わる。   For example, in the case of an axial fan represented by a propeller fan of an air conditioner outdoor unit, rotational torque and centrifugal force mainly act on the vibration isolator during operation. In addition to environmental load such as temperature, humidity, ozone and ultraviolet rays.

このような条件下において、プロペラファンの防振具を構成する弾性部材には、回転軸線方向と、鉛直方向(自重に沿った上下方向)とに少なからず永久ひずみ(クリープ変形)が発生する。こうした変形は、僅かな場合には影響が少ないが、その程度によっては、運転の際に、回転軸に対するプロペラファンの偏心、回転軸線方向での振れやアンバランス等を引き起こしてファンの回転精度を悪化させて新たな振動や騒音の発生を誘引することがある。   Under such conditions, the elastic member that constitutes the vibration isolator of the propeller fan undergoes permanent distortion (creep deformation) in at least the rotation axis direction and the vertical direction (vertical direction along its own weight). These deformations have little effect in a few cases, but depending on the degree, during operation, the propeller fan is decentered with respect to the rotating shaft, causing runout or unbalance in the rotating axis direction, etc. It may worsen and induce new vibration and noise.

これに対し、エアコン室内機(例えば天井埋め込みタイプ)のターボファンに代表される遠心ファンの場合、運転時にも回転トルクや遠心力以外にファンの自重による回転軸線方向の負荷が作用するため、回転軸線方向の更なる負荷に耐え得る強度を弾性部材に持たせる必要がある。   On the other hand, in the case of a centrifugal fan typified by a turbo fan of an air conditioner indoor unit (for example, a ceiling-embedded type), a load in the rotational axis direction due to the weight of the fan acts in addition to the rotational torque and centrifugal force during operation. It is necessary to give the elastic member enough strength to withstand further loads in the axial direction.

即ち、送風用ファンを支持するにあたっては、回転方向(円周方向)に作用するせん断力等の応力と、回転軸線方向に作用するせん断力等の応力とを考慮して弾性部材を選定する必要がある。   That is, when supporting the blower fan, it is necessary to select an elastic member in consideration of stress such as shear force acting in the rotational direction (circumferential direction) and stress such as shear force acting in the rotational axis direction. There is.

そこで、弾性部材に用いる材料に着目した場合、クロロプレンゴム(CR)、二トリルゴム(NBR)、エチレンプロピレンゴム(EPR、EPDM)等の各種加硫ゴム、又は、スチレン系エラストマ(SBS、SEBS)、オレフィン系エラストマ(TPO)を始めとする各種熱可塑性エラストマが好適であり、各材質に応じて、硬度(JIS K6253A)を35°〜65°の範囲で選定する。   Therefore, when focusing on the material used for the elastic member, various vulcanized rubbers such as chloroprene rubber (CR), nitrile rubber (NBR), ethylene propylene rubber (EPR, EPDM), or styrene elastomer (SBS, SEBS), Various thermoplastic elastomers including olefin elastomer (TPO) are suitable, and the hardness (JIS K6253A) is selected in the range of 35 ° to 65 ° according to each material.

しかしながら、防振具としての製造効率やリサイクル性等を上げるため、使用する材料をCR等の加硫ゴムから熱可塑性エラストマに変更した場合、防振性能を維持すべく、加硫ゴムと同等の硬度を選定しようとすると、機械的諸物性について加硫ゴムよりも劣ることがある。こうした場合、開発段階で十分な耐久性の検証と、製造時の品質管理との必要性が一層高まるため、製造コストの増大を免れない。   However, if the material used is changed from CR or other vulcanized rubber to thermoplastic elastomer in order to increase production efficiency or recyclability as a vibration isolator, it is equivalent to vulcanized rubber to maintain vibration isolating performance. When trying to select hardness, mechanical properties may be inferior to vulcanized rubber. In such a case, the necessity of sufficient durability verification at the development stage and quality control at the time of manufacture is further increased, and thus an increase in manufacturing cost is inevitable.

また、防振性能の向上を目的に、弾性部材の厚みを増して弾性部材の体積増加を図ったり、弾性部材の硬度低下を図ることも考慮されるが、機械的強度特性や熱的特性の低下を招くことがある。こうした機械的強度特性や熱的特性の低下は、結果的に、運転時に伴って生じる諸因子により、弾性部材にクリープ変形を生じさせ、また、繰り返し応力の蓄積により、弾性部材の疲労破断に至ることがあり得る。   For the purpose of improving the anti-vibration performance, it is considered to increase the thickness of the elastic member by increasing the thickness of the elastic member or to reduce the hardness of the elastic member. May cause a drop. Such a decrease in mechanical strength characteristics and thermal characteristics results in creep deformation of the elastic member due to various factors that occur during operation, and fatigue damage of the elastic member due to repeated stress accumulation. It can happen.

即ち、本願発明者は、弾性部材の防振性能と共に耐久性能を向上させようとする場合、両者は相反する特性を有することから、例えば、弾性部材の厚みを増大させても、その両立は困難で、開発上及び製造管理上の支障となることが多いことを見出した。   That is, when the present inventor intends to improve the durability performance as well as the vibration proof performance of the elastic member, both have contradictory characteristics. For example, even if the thickness of the elastic member is increased, it is difficult to achieve both. Thus, it has been found that it often becomes a hindrance in development and manufacturing management.

加えて、例えば空気調和機器の場合、その種類も様々であるところから、機器毎の特性に合せた防振具の選定が必要である。この結果、防振具は、空気調和機器毎に非共通となるため、開発上の負荷や製造上の識別管理の負荷が増大するが、特に、弾性部材の肉厚やその形状を変更する場合には、内筒と外筒の寸法変更を伴うことがあり、その影響は顕著である。   In addition, for example, in the case of air-conditioning equipment, there are various types, so it is necessary to select a vibration isolator that matches the characteristics of each equipment. As a result, the vibration isolator becomes non-common for each air conditioner, so that the load on development and the identification management load on manufacturing increase. Especially, when changing the thickness and shape of the elastic member May be accompanied by a change in the dimensions of the inner cylinder and the outer cylinder, and the influence is remarkable.

このため、内筒及び外筒を形成するための製造設備(例えば、ダイカスト金型、プレス金型、樹脂射出成形用金型等)も、これに応じて変更する必要があるため、更に、複雑な製造上の品質管理や識別管理が必要となる。即ち、弾性部材の厚さや形状を変更する場合も、結果的には製造コストの増大を免れない。   For this reason, the manufacturing equipment for forming the inner cylinder and the outer cylinder (for example, die casting mold, press mold, resin injection molding mold, etc.) needs to be changed accordingly. Quality manufacturing management and identification management are required. That is, even when the thickness and shape of the elastic member are changed, the manufacturing cost is inevitably increased as a result.

即ち、防振性能と耐久性能という相反する特性を同時に改善しつつ、コストの上昇が抑制された防振具は未だ提案されていないのが実情であった。   That is, the actual situation is that no anti-vibration device has been proposed in which the increase in cost is suppressed while simultaneously improving the conflicting characteristics of vibration-proof performance and durability performance.

本発明の解決すべき課題は、防振性能と耐久性能とが相反する特性を有するためにその両立が困難であり、それを解決するにあたってはコストの増大を免れ得ないことにあり、
本発明の目的とするところは、こうした課題を解決した送風用ファンの防振具及び、それを備えた送風用ファン構造体を提供することにある。
The problem to be solved by the present invention is that it is difficult to achieve both because the vibration-proof performance and the durability performance are contradictory, and it is inevitable to increase the cost in solving it,
An object of the present invention is to provide a blower fan vibration isolator that solves these problems and a blower fan structure including the same.

本発明である送風用ファンの防振具は、回転軸に固定される内筒と、送風用ファンを保持する外筒と、内筒及び外筒を一体に連結する弾性部材とを有する送風用ファンの防振具であって、内筒の外周面に、この内筒から半径方向外側に向かって突出する軸線方向延在部を円周方向に間隔を空けて設ける一方、外筒の内周面に、この外筒から半径方向内側に向かって突出する軸線方向延在部を円周方向に間隔を空けて設け、内筒側の軸線方向延在部の先端に接する接円の直径Dと、外筒側の軸線方向延在部の先端に接する接円の直径dとをD≧dに設定すると共に、内筒と外筒とを、これらの軸線方向延在部が互い違いになるように配置して、内筒と外筒との間に、回転軸の周りに沿って複数の半閉鎖領域を有する連続空間を形成し、この連続空間に、円周方向の応力が発生するとき、この応力が前記軸線方向延在部によって抑制されるように、当該弾性部材を設けたことを特徴とするものである。   The vibration isolator for a blower fan according to the present invention includes an inner cylinder fixed to a rotating shaft, an outer cylinder holding the blower fan, and an elastic member integrally connecting the inner cylinder and the outer cylinder. An anti-vibration device for a fan, wherein an axially extending portion projecting radially outward from the inner cylinder is provided on the outer peripheral surface of the inner cylinder at an interval in the circumferential direction. An axially extending portion projecting radially inward from the outer cylinder is provided on the surface with a circumferential interval, and a diameter D of a contact circle in contact with the tip of the axially extending part on the inner cylinder side; The diameter d of the contact circle in contact with the tip of the axially extending portion on the outer cylinder side is set to D ≧ d, and the axially extending portions of the inner cylinder and the outer cylinder are staggered. Arranging and forming a continuous space having a plurality of semi-closed regions around the rotation axis between the inner cylinder and the outer cylinder. During, when the circumferential stress is generated, so that the stress is suppressed by the axial extending portion and is characterized in that a said resilient member.

この場合、当該軸線方向延在部のそれぞれの先端部をオーバーラップさせることにより、内筒と外筒との間に、前記連続空間を設けることが好ましい。   In this case, it is preferable to provide the continuous space between the inner cylinder and the outer cylinder by overlapping the respective distal end portions of the axially extending portions.

特に、外筒の軸線方向延在部は、当該外筒の内周面と共にその外周面を半径方向内側に突出させて形成することも可能である。   In particular, the axially extending portion of the outer cylinder can be formed by protruding the outer peripheral surface of the outer cylinder inward in the radial direction together with the inner peripheral surface of the outer cylinder.

また、本発明である送風用ファンの防振具は、回転軸に固定される内筒と、送風用ファンを保持する外筒と、内筒及び外筒を一体に連結する弾性部材とを有する送風用ファンの防振具であって、内筒の外周面に、この内筒から半径方向外側に向かって突出する円周方向延在部を設け、若しくは、外筒の内周面に、この外筒から半径方向内側に向かって突出する円周方向延在部を設け、又は、内筒の外周面と外筒の内周面との両方に、前記円周方向延在部を設け、内筒と外筒との間に、軸線方向に沿って少なくとも1つの半閉鎖領域を有する連続空間を形成し、この連続空間に、前記弾性部材の内部で軸線方向の応力が発生するとき、この応力が前記円周方向延在部によって抑制されるように、当該弾性部材を設けたことを特徴とするものである。   The blower vibration isolator of the present invention includes an inner cylinder fixed to the rotating shaft, an outer cylinder holding the blower fan, and an elastic member that integrally connects the inner cylinder and the outer cylinder. A vibration isolator for a blower fan, provided on the outer peripheral surface of the inner cylinder with a circumferentially extending portion projecting radially outward from the inner cylinder, or on the inner peripheral surface of the outer cylinder A circumferentially extending portion that protrudes radially inward from the outer cylinder is provided, or the circumferentially extending portion is provided on both the outer peripheral surface of the inner cylinder and the inner peripheral surface of the outer cylinder, A continuous space having at least one semi-closed region along the axial direction is formed between the cylinder and the outer cylinder, and when stress in the axial direction is generated inside the elastic member in the continuous space, this stress is generated. Is provided with the elastic member such that the elastic member is suppressed by the circumferentially extending portion. .

この場合、前記円周方向延在部を、内筒の外周面と、外筒の内周面との両方に、回転軸に沿って間隔を空けて設け、
内筒側の円周方向延在部の先端に接する接円の直径Dと、外筒側の円周方向延在部の先端に接する接円の直径dとをD≧dに設定すると共に、内筒と外筒とを、これらの円周方向延在部が互い違いになるように配置することが好ましい。
In this case, the circumferentially extending portion is provided on both the outer peripheral surface of the inner cylinder and the inner peripheral surface of the outer cylinder with an interval along the rotation axis,
The diameter D of the contact circle in contact with the tip of the circumferential extension portion on the inner cylinder side and the diameter d of the contact circle in contact with the tip of the circumferential extension portion on the outer cylinder side are set to D ≧ d. It is preferable to arrange | position an inner cylinder and an outer cylinder so that these circumferential direction extension parts may become alternate.

この場合、前記円周方向延在部を、内筒の外周面と、外筒の内周面とにそれぞれ、軸線方向に沿って間隔を空けて設け、当該円周方向延在部のそれぞれの先端部をオーバーラップさせることにより、前記連続空間を設けることが好ましい。   In this case, the circumferentially extending portion is provided on the outer peripheral surface of the inner cylinder and the inner peripheral surface of the outer cylinder, respectively, with an interval along the axial direction, and each of the circumferentially extending portions is provided. It is preferable to provide the continuous space by overlapping the front end portions.

前記円周方向延在部は、内筒又は外筒の全周に亘って環状に形成することができる。また、前記円周方向延在部は、内筒又は外筒の円周方向に沿って断続的に形成することもできる。   The circumferentially extending portion can be formed in an annular shape over the entire circumference of the inner cylinder or the outer cylinder. Moreover, the said circumferential direction extension part can also be formed intermittently along the circumferential direction of an inner cylinder or an outer cylinder.

更に、内筒及び外筒の前記円周方向延在部のうちの少なくとも一方の外周縁は、円周方向に沿って形成された凹凸形状とすることができる。また、内筒及び外筒の前記円周方向延在部のうちの少なくとも一方には、軸線方向に貫通する貫通孔を形成してもよい。   Furthermore, the outer peripheral edge of at least one of the circumferentially extending portions of the inner cylinder and the outer cylinder can be an uneven shape formed along the circumferential direction. A through hole penetrating in the axial direction may be formed in at least one of the circumferentially extending portions of the inner cylinder and the outer cylinder.

更に、本発明である送風用ファンの防振具によれば、これらの構成を組み合わせることが好ましい。   Furthermore, according to the vibration isolator of the air blower fan which is this invention, it is preferable to combine these structures.

また、本発明である送風用ファン構造体は、上述した構成を具備した防振具と、この防振具の外筒に結合する送風用ファンとを備えることを特徴とするものである。   Moreover, the fan structure for ventilation which is this invention is equipped with the vibration isolator which comprised the structure mentioned above, and the fan for ventilation couple | bonded with the outer cylinder of this vibration isolator.

本発明である送風用ファンの防振具によれば、内筒に設けた軸線方向延在部の先端に接する接円の直径Dと、外筒に設けた軸線方向延在部の先端に接する接円の直径dとをD≧dに設定すると共に、これらを互い違いになるように配置して、内筒と外筒との間に、円周方向に沿って複数の半閉鎖領域を有する連続空間を形成し、この連続空間に、当該弾性部材を設けたことから、弾性部材における、軸線と直交する断面形状は、内筒側の軸線方向延在部と、外筒側の軸線方向延在部とが円周方向に沿って交互に差し込まれた形状となる。   According to the vibration isolator for the blower fan of the present invention, the diameter D of the contact circle in contact with the tip of the axially extending portion provided in the inner cylinder and the tip of the axially extending portion provided in the outer cylinder are in contact. The diameter d of the tangent circle is set to D ≧ d, and these are alternately arranged so that a plurality of semi-closed regions are provided along the circumferential direction between the inner cylinder and the outer cylinder. Since the space is formed and the elastic member is provided in this continuous space, the cross-sectional shape of the elastic member perpendicular to the axis is extended in the axial direction on the inner cylinder side and in the axial direction on the outer cylinder side. The parts are alternately inserted along the circumferential direction.

このため、弾性部材の内部に回転軸周り(円周方向)に応力が生じると、この応力は、内筒の外周面との接合面と外筒の内周面との接合面とに加え、内筒側の軸線方向延在部と、外筒側の軸線方向延在部とで受けることになる。従って、本発明に係る防振具を送風用ファンに取付けて回転させると駆動源からの回転力は、防振具の内筒から弾性部材を介して送風用ファンを保持する外筒に伝えられる。   For this reason, when a stress occurs around the rotation axis (circumferential direction) inside the elastic member, this stress is added to the joint surface between the outer peripheral surface of the inner cylinder and the joint surface between the inner peripheral surface of the outer cylinder, This is received by the axially extending portion on the inner cylinder side and the axially extending portion on the outer cylinder side. Therefore, when the vibration isolator according to the present invention is attached to the blower fan and rotated, the rotational force from the drive source is transmitted from the inner cylinder of the vibration isolator to the outer cylinder holding the blower fan via the elastic member. .

また、かかる構成によれば、回転にあたり、内筒(外筒)側の軸線方向延在部から半閉鎖領域を通って弾性部材の一部が膨出すると、この膨出部分は、内筒(外筒)側の軸線方向延在部と隣り合う外筒(内筒)側の軸線方向延在部に偏るが、この偏りは、内筒(外筒)側の軸線方向延在部と隣り合う外筒(内筒)側の軸線方向延在部で保持される。即ち、円周方向に沿って連続的なせん断力等の応力を生じても、かかる応力は、剛性の高い内筒及び外筒の軸線方向延在部によって確実に保持される。   Further, according to this configuration, when the elastic member partially bulges through the semi-closed region from the axially extending portion on the inner cylinder (outer cylinder) side during rotation, the bulged portion Although it is biased to the axially extending portion on the outer cylinder (inner cylinder) side adjacent to the axially extending portion on the outer cylinder) side, this bias is adjacent to the axially extending portion on the inner cylinder (outer cylinder) side. It is held by the axially extending portion on the outer cylinder (inner cylinder) side. That is, even if a stress such as a continuous shear force is generated along the circumferential direction, the stress is reliably held by the axially extending portions of the highly rigid inner cylinder and outer cylinder.

この結果、弾性部材にて、その円周方向に連続的に作用する応力は軸線方向延在部で分断されることにより抑制され、弾性部材の耐久性、ひいては、防振具の耐久性を容易に向上させることができる。また、互いに隣り合う軸線方向延在部間に形成された領域でも、円周方向に沿って圧縮作用と伸張作用とが働くことで、防振具としての制振効果、特にトルク変動時の回転(円周)方向における制振効果を向上させることができる。   As a result, the stress that acts continuously in the circumferential direction in the elastic member is suppressed by being divided at the extending portion in the axial direction, and the durability of the elastic member, and thus the durability of the vibration isolator is easy. Can be improved. In addition, even in the region formed between the axially extending portions adjacent to each other, the compression action and the extension action work along the circumferential direction, so that the vibration damping effect as a vibration isolator, especially the rotation at the time of torque fluctuation The vibration control effect in the (circumferential) direction can be improved.

また、弾性部材にて、その半径方向(回転軸線に向かう方向)に応力が加わる場合も、当該弾性部材に係る、内筒の外周面と外筒の内周面との間、内筒の外周面と外筒側の軸線方向延在部との間、外筒の内周面と内筒側の軸線方向延在部との間、並びに、内筒側及び外筒側の軸線方向延在部の間での弾性力によって確実に抑制される。   Further, even when stress is applied to the elastic member in the radial direction (direction toward the rotation axis), the outer periphery of the inner cylinder is between the outer peripheral surface of the inner cylinder and the inner peripheral surface of the outer cylinder according to the elastic member. Between the surface and the axial extension portion on the outer cylinder side, between the inner peripheral surface of the outer cylinder and the axial extension portion on the inner cylinder side, and axial extension portions on the inner cylinder side and the outer cylinder side It is reliably suppressed by the elastic force between.

更に、弾性部材における、軸線と直交する断面形状は、内筒側の軸線方向延在部と、外筒側の軸線方向延在部とが円周方向に沿って交互に差し込まれた形状となることから、弾性部材と内筒との接合面積及び弾性部材と外筒の接合面積が増大するため、内筒及び外筒と弾性部材との接合状態がより強固になると共に、内筒及び外筒と弾性部材との接合面にて生じる応力も軽減される。   Furthermore, the cross-sectional shape orthogonal to the axis in the elastic member is a shape in which the axially extending portion on the inner cylinder side and the axially extending portion on the outer cylinder side are alternately inserted along the circumferential direction. Therefore, the bonding area between the elastic member and the inner cylinder and the bonding area between the elastic member and the outer cylinder are increased, so that the bonding state between the inner cylinder and the outer cylinder and the elastic member becomes stronger, and the inner cylinder and the outer cylinder. The stress generated at the joint surface between the elastic member and the elastic member is also reduced.

このため、従来の課題となっていた弾性部材の耐久性能に影響を及ぼすクリープ変形や疲労破断の要因となる、弾性部材の面積(厚み)増大や、材料の選定による硬度低下があっても、これらを行うことにより、効果的な防振性能を得ることができると共に、耐久性能の向上を図ることができる。つまり、相反する特性を有する防振性能の向上と耐久性能の向上との両立を図ることができる。   Therefore, even if there is an increase in the area (thickness) of the elastic member, which causes creep deformation and fatigue rupture that affects the durability performance of the elastic member, which has been a problem in the past, or a decrease in hardness due to selection of the material, By performing these, it is possible to obtain effective vibration isolation performance and to improve durability performance. That is, it is possible to achieve both the improvement of the vibration isolation performance having the contradictory characteristics and the improvement of the durability performance.

また、クリープ変形などを抑制し耐久性能を高めるにあたり、硬度の高い材料を積極的に採用する必要がないことから、材質や硬度の選定が容易になり、開発時の検証時間の短縮と共に製造時の品質管理や識別管理も容易になる。更に、弾性部材の半径方向肉厚を変更する必要がないから、内筒及び外筒の製造金型や内筒と外筒との間に弾性部材を成形する際の製造金型を流用することで共通化できる。   In addition, it is not necessary to aggressively adopt materials with high hardness in order to suppress creep deformation and improve durability performance, making it easier to select materials and hardness, reducing verification time during development, and manufacturing Quality control and identification management are also facilitated. Furthermore, since there is no need to change the radial thickness of the elastic member, the manufacturing mold for forming the elastic member between the inner cylinder and the outer cylinder or the manufacturing mold for the inner cylinder and the outer cylinder can be used. Can be shared.

即ち、内筒側と外筒側とに軸線方向延在部を設け、内筒側接円の直径Dと、外筒側接円の直径dとをD≧dに設定したことで、相反する特性を有する防振性能の向上と耐久性能の向上との両立をコストの増大を招くことなく実現することができる。   In other words, the axially extending portions are provided on the inner cylinder side and the outer cylinder side, and the diameter D of the inner cylinder side tangent circle and the diameter d of the outer cylinder side tangent circle are set to D ≧ d. It is possible to realize both the improvement of the vibration-proof performance having the characteristics and the improvement of the durability performance without causing an increase in cost.

また、防振性能や耐久性能について、用途等に応じてより広範囲の調整を行うにあたっては、内筒及び外筒に設けた軸線方向延在部の形状、円周方向幅、軸線方向長さ、高さ、又は、軸線方向突出部の個数を適宜変更・組み合わせるだけでよい。このため、本発明によれば、防振性能や耐久性能について、用途等に応じたより広範囲の調整を容易に実現することができる。   In addition, regarding the vibration-proof performance and durability performance, when performing a wider range of adjustment according to the application, etc., the shape of the axially extending portion provided in the inner cylinder and the outer cylinder, the circumferential width, the axial length, It is only necessary to change or combine the height or the number of axial protrusions as appropriate. For this reason, according to the present invention, it is possible to easily realize a wider range of adjustment in accordance with the use etc. with respect to vibration proof performance and durability performance.

特に、前記軸線方向延在部を、内筒の外周面と、外筒の内周面とにそれぞれ、円周方向に沿って間隔を空けて設け、内筒側接円の直径Dと、外筒側接円の直径dとをD>dに設定することで、当該軸線方向延在部それぞれの先端をオーバーラップさせれば、上述した効果が一層顕著なものとなる。   In particular, the axially extending portion is provided on the outer peripheral surface of the inner cylinder and the inner peripheral surface of the outer cylinder at intervals along the circumferential direction. By setting the diameter d of the cylinder side tangent circle so that D> d, the above-described effects will be more remarkable if the tips of the axially extending portions are overlapped.

なお、内筒の外周面又は外筒の内周面から突出する軸線方向延在部は、弾性部材を介して受ける回転力や製品自重等による軸方向応力、又は、弾性部材をゴム成形等する時の射出圧力や温度等を受けても変形や破損することなく防振具としての機能を維持するために、これら応力に対して十分耐えうる強度が必要である。   The axially extending portion protruding from the outer peripheral surface of the inner cylinder or the inner peripheral surface of the outer cylinder is subjected to rotational stress received through the elastic member, axial stress due to the product's own weight, etc., or rubber molding of the elastic member. In order to maintain the function as a vibration isolator without being deformed or damaged even when subjected to the injection pressure or temperature at the time, it is necessary to have sufficient strength to withstand these stresses.

特に、軸線方向延在部を薄肉のリブ形状で形成する場合は、上述の応力に対して変形や破損を受け易く、新たに解決すべき課題となる。   In particular, when the axially extending portion is formed in a thin rib shape, it tends to be deformed or damaged by the above-mentioned stress, which is a new problem to be solved.

この対策としては、リブ形状の肉厚を増加させる方法があるが、例えば、内筒(外筒)が樹脂成形品である場合は、厚肉部の形成に伴いヒケ(局所的変形)やボイド(気泡)が発生すると共に、使用原材料の増加や成形時間の増加を免れない。   As a countermeasure, there is a method of increasing the thickness of the rib shape. For example, when the inner cylinder (outer cylinder) is a resin molded product, sink marks (local deformation) and voids are formed along with the formation of the thick wall portion. (Bubbles) are generated, and an increase in raw materials used and an increase in molding time are inevitable.

そこで、本発明において、外筒の軸線方向延在部を、例えば射出成形に用いる金型により、当該外筒の内周面と共にその外周面を半径方向内側に突出させて形成すれば、軸線方向延在部の厚みを増して強度向上が図れると共に外周面からの肉盗み形状(凹形状)により、上述した新たな課題も解決することができる。   Therefore, in the present invention, if the axially extending portion of the outer cylinder is formed by, for example, a mold used for injection molding, the outer peripheral surface of the outer cylinder and the outer peripheral surface thereof are protruded radially inward. The thickness can be increased by increasing the thickness of the extending portion, and the above-described new problem can be solved by the stealing shape (concave shape) from the outer peripheral surface.

ところで、防振具の弾性部材内には、その内部に軸線方向の応力も発生する。この応力は、プロペラファンの防振具として用いる場合、プロペラファンは主として回転軸線を地面に対して水平方向に配置して使用されることが多いため、風圧や揚力による作用によって発生し、また、ターボファンの防振具として用いる場合、ターボファンは地面に鉛直方向で使用されることの多いため、ファン自重の作用によって発生する。   Incidentally, in the elastic member of the vibration isolator, stress in the axial direction is also generated therein. When used as a vibration isolator for a propeller fan, this stress is often generated by the action of wind pressure and lift because the propeller fan is mainly used with the rotation axis arranged horizontally to the ground. When used as a vibration isolator for a turbofan, the turbofan is often used in a vertical direction on the ground surface, and thus is generated by the action of the fan's own weight.

そこで、本発明である送風用ファンの防振具に、内筒から半径方向外側に向かって突出する円周方向延在部と、外筒から半径方向内側に向かって突出する円周方向延在部との少なくとも一方を設ければ、本発明に係る防振具に軸線方向の負荷がかかった場合、弾性部材の偏りを軸線方向に対して保持することで、当該弾性部材に発生する軸線方向の応力を抑制できると共に、永久ひずみ(クリープ変形)の抑制も可能となる。   Therefore, in the vibration isolator of the blower fan according to the present invention, a circumferentially extending portion projecting radially outward from the inner cylinder, and a circumferentially extending projecting radially inward from the outer cylinder If an axial load is applied to the vibration isolator according to the present invention, the axial direction generated in the elastic member is maintained by holding the bias of the elastic member with respect to the axial direction. In addition, it is possible to suppress permanent stress (creep deformation).

この結果、弾性部材内で、その軸線方向に連続的に作用する応力は円周方向延在部で分断されることにより抑制され、弾性部材の耐久性、ひいては、防振具の耐久性を容易に向上させることができる。また、円周方向延在部により弾性部材の圧縮作用と伸張作用とが軸線方向に沿って働くことで、防振具としての制振効果、特に軸線方向における制振効果を向上させることができる。   As a result, the stress that acts continuously in the axial direction in the elastic member is suppressed by being divided at the circumferentially extending portion, thereby facilitating the durability of the elastic member and hence the durability of the vibration isolator. Can be improved. In addition, the compressing action and the extending action of the elastic member work along the axial direction by the circumferentially extending portion, so that the damping effect as the vibration isolator, particularly the damping effect in the axial direction can be improved. .

更に、内筒と外筒との少なくとも一方に円周方向延在部を設けたことで、弾性部材における、軸線を含む断面形状は、内筒側の円周方向延在部と、外筒側の円周方向延在部との少なくとも一方が円周方向に沿って差し込まれた形状となるから、弾性部材と内筒との接合面積及び弾性部材と外筒の接合面積の少なくとも一方が増大するため、内筒及び外筒の少なくとも一方と弾性部材との接合状態がより強固になると共に、内筒及び外筒の少なくとも一方と弾性部材との接合面にて生じる応力も軽減される。   Furthermore, by providing the circumferentially extending portion on at least one of the inner cylinder and the outer cylinder, the cross-sectional shape including the axis line of the elastic member is the circumferentially extending portion on the inner cylinder side and the outer cylinder side. At least one of the joining area between the elastic member and the inner cylinder and at least one of the joining area between the elastic member and the outer cylinder is increased. Therefore, the joining state between at least one of the inner cylinder and the outer cylinder and the elastic member becomes stronger, and the stress generated on the joining surface between at least one of the inner cylinder and the outer cylinder and the elastic member is reduced.

このため、従来の課題となっていた弾性部材の耐久性能に影響を及ぼすクリープ変形や疲労破断の要因となる、弾性部材の面積(厚み)増大や、材料の選定による硬度低下があっても、これらを行うことにより、効果的な防振性能を得ることができると共に、耐久性能の向上を図ることができる。つまり、相反する特性を有する防振性能の向上と耐久性能の向上との両立を図ることができる。   Therefore, even if there is an increase in the area (thickness) of the elastic member, which causes creep deformation and fatigue rupture that affects the durability performance of the elastic member, which has been a problem in the past, or a decrease in hardness due to selection of the material By performing these, it is possible to obtain effective vibration isolation performance and to improve durability performance. That is, it is possible to achieve both the improvement of the vibration isolation performance having the contradictory characteristics and the improvement of the durability performance.

また、クリープ変形などを抑制し耐久性能を高めるにあたり、硬度の高い材料を積極的に採用する必要がないから、材質や硬度の選定が容易になり、開発時の検証時間の短縮と共に製造時の品質管理や識別管理も容易になる。更に、弾性部材の半径方向肉厚を変更する必要がないから、内筒及び外筒の製造金型や内筒と外筒との間に弾性部材を成形する際の製造金型を流用することで共通化できる。   In addition, in order to suppress creep deformation and improve durability, it is not necessary to aggressively adopt materials with high hardness, making it easy to select materials and hardness, reducing verification time during development, and reducing manufacturing time. Quality management and identification management become easy. Furthermore, since there is no need to change the radial thickness of the elastic member, the manufacturing mold for forming the elastic member between the inner cylinder and the outer cylinder or the manufacturing mold for the inner cylinder and the outer cylinder can be used. Can be shared.

即ち、本発明によれば、相反する特性を有する防振性能の向上と耐久性能の向上との両立をコストの増大を招くことなく実現することができる。   That is, according to the present invention, it is possible to realize both the improvement of the anti-vibration performance having the contradictory characteristics and the improvement of the durability performance without causing an increase in cost.

また、防振性能や耐久性能について、用途等に応じてより広範囲の調整を行うにあたっては、内筒及び外筒に設けた円周方向延在部の形状、円周方向幅、軸線方向長さ、高さ、又は、円周方向延在部の個数を適宜変更・組み合わせるだけでよい。このため、本発明によれば、防振性能や耐久性能について、用途等に応じたより広範囲の調整を容易に実現することができる。   In addition, when performing more extensive adjustments for vibration-proof performance and durability performance depending on the application, etc., the shape of the circumferentially extending portion provided in the inner cylinder and outer cylinder, the circumferential width, and the axial length It is only necessary to change or combine the height or the number of circumferentially extending portions as appropriate. For this reason, according to the present invention, it is possible to easily realize a wider range of adjustment in accordance with the use etc. with respect to vibration proof performance and durability performance.

特に、内筒の外周面に設けた円周方向延在部の先端に接する接円の直径Dと、外筒の内周面に設けた円周方向延在部の先端に接する接円の直径dとをD≧dに設定すると共に、これらを互い違いになるように配置して、内筒と外筒との間に、軸線に沿って複数の半閉鎖領域を有する連続空間を形成し、この連続空間に、当該弾性部材を設ければ、弾性部材における、軸線を含む断面形状は、内筒側の円周方向延在部と、外筒側の円周方向延在部とが軸線方向に沿って交互に差し込まれた形状となる。   In particular, the diameter D of the contact circle in contact with the tip of the circumferentially extending portion provided on the outer peripheral surface of the inner cylinder, and the diameter of the contact circle in contact with the tip of the circumferentially extending portion provided on the inner peripheral surface of the outer cylinder. d is set to be D ≧ d, and these are alternately arranged to form a continuous space having a plurality of semi-closed regions along the axis between the inner cylinder and the outer cylinder. If the elastic member is provided in the continuous space, the cross-sectional shape including the axis of the elastic member is such that the circumferentially extending portion on the inner cylinder side and the circumferentially extending portion on the outer cylinder side are in the axial direction. It becomes the shape inserted alternately along.

このため、軸線方向に応力が生じて、内筒(外筒)側の円周方向延在部から半閉鎖領域を通って弾性部材の一部が膨出すると、この膨出部分は、外筒(内筒)側の円周方向延在部と隣り合う内筒(外筒)側の円周方向延在部に偏るが、この偏りは、内筒側の軸線方向延在部と隣り合う外筒側の軸線方向延在部で保持される。即ち、軸線方向に沿って連続的な応力を生じても、かかる応力は、剛性の高い内筒及び外筒の円周方向延在部によって確実に抑制される。   For this reason, when stress occurs in the axial direction and a part of the elastic member bulges from the circumferentially extending portion on the inner cylinder (outer cylinder) side through the semi-closed region, the bulged portion Although it is biased toward the circumferentially extending portion on the inner cylinder (outer cylinder) side adjacent to the circumferentially extending portion on the (inner cylinder) side, this bias is outside the axially extending portion on the inner cylinder side. It is held by the axially extending portion on the cylinder side. That is, even if a continuous stress is generated along the axial direction, the stress is reliably suppressed by the circumferentially extending portions of the highly rigid inner cylinder and outer cylinder.

この結果、弾性部材にて、その軸線方向に連続的に作用する応力は円周方向延在部で分断されることにより抑制され、弾性部材の耐久性、ひいては、防振具の耐久性を容易に向上させることができる。また、互いに隣り合う円周方向延在部間に形成された領域でも、軸線方向に沿って圧縮作用と伸張作用とが働くことで、防振具としての制振効果、特に軸線方向における制振効果を更に向上させることができる。   As a result, the stress that acts continuously in the axial direction in the elastic member is suppressed by being divided at the circumferentially extending portion, and the durability of the elastic member, and thus the durability of the vibration isolator can be easily achieved. Can be improved. Further, even in a region formed between adjacent circumferentially extending portions, the compression action and the extension action work along the axial direction, so that the vibration damping effect as a vibration isolator, particularly the vibration damping in the axial direction. The effect can be further improved.

また、弾性部材にて、その半径方向(回転軸に向かう方向)に応力が加わる場合も、当該弾性部材に係る、内筒の外周面と外筒の内周面との間、内筒の外周面と外筒側の円周方向延在部との間、外筒の内周面と内筒側の円周方向延在部との間及び、内筒側並びに外筒側の円周方向延在部での弾性力によって確実に保持される。   Further, even when stress is applied in the radial direction (direction toward the rotation axis) in the elastic member, the outer periphery of the inner cylinder is between the outer peripheral surface of the inner cylinder and the inner peripheral surface of the outer cylinder according to the elastic member. Between the inner surface of the outer cylinder and the circumferential extension of the inner cylinder, and between the inner cylinder and the outer cylinder. It is securely held by the elastic force in the existing part.

加えて、弾性部材の軸線方向に沿った断面形状は、内筒側の円周方向延在部と、外筒側の円周方向延在部とが円周方向に沿って交互に差し込まれた形状となることから、弾性部材と内筒との接合面積及び弾性部材と外筒の接合面積が増大するため、内筒及び外筒と弾性部材との接合状態がより強固になると共に、内筒及び外筒と弾性部材との接合面にて生じる応力も軽減される。   In addition, the cross-sectional shape along the axial direction of the elastic member is such that the circumferentially extending portion on the inner cylinder side and the circumferentially extending portion on the outer cylinder side are alternately inserted along the circumferential direction. Since it becomes a shape, the bonding area between the elastic member and the inner cylinder and the bonding area between the elastic member and the outer cylinder increase, so that the bonding state between the inner cylinder and the outer cylinder and the elastic member becomes stronger, and the inner cylinder And the stress which arises in the joint surface of an outer cylinder and an elastic member is also reduced.

このため、従来の課題となっていた弾性部材の面積(厚み)増大や、材料の選定による硬度低下があっても、これらを行うことにより、効果的な防振性能を得ることができると共に、耐久性能の向上を図ることができる。つまり、相反する特性を有する防振性能の向上と耐久性能の向上との両立を図ることができる。   For this reason, even if there is an increase in the area (thickness) of the elastic member, which has been a problem in the past, or a decrease in hardness due to the selection of the material, by performing these, it is possible to obtain effective vibration isolation performance, Durability can be improved. That is, it is possible to achieve both the improvement of the vibration isolation performance having the contradictory characteristics and the improvement of the durability performance.

また、クリープ変形などを抑制し耐久性能を高めるにあたり、硬度の高い材料を積極的に採用する必要がないことから、材質や硬度の選定が容易になり、開発時の検証時間の短縮と共に製造時の品質管理や識別管理も容易になる。更に、弾性部材の半径方向肉厚を変更する必要がないから、内筒及び外筒の製造金型や内筒と外筒との間に弾性部材を成形する際の製造金型を流用することで共通化できる。   In addition, it is not necessary to aggressively adopt materials with high hardness in order to suppress creep deformation and improve durability performance, making it easier to select materials and hardness, reducing verification time during development, and manufacturing Quality control and identification management are also facilitated. Furthermore, since there is no need to change the radial thickness of the elastic member, the manufacturing mold for forming the elastic member between the inner cylinder and the outer cylinder or the manufacturing mold for the inner cylinder and the outer cylinder can be used. Can be shared.

即ち、内筒側と外筒側とに円周方向延在部を設け、内筒側接円の直径Dと、外筒側接円の直径dとをD≧dに設定すれば、相反する特性を有する防振性能の向上と耐久性能の向上との両立を更なるコストの低下を図りつつ実現することができる。   That is, if the circumferentially extending portions are provided on the inner cylinder side and the outer cylinder side, and the diameter D of the inner cylinder side circumscribed circle and the diameter d of the outer cylinder side circumscribed circle are set to D ≧ d, they are contradictory. It is possible to realize both the improvement of the vibration-proof performance having the characteristics and the improvement of the durability performance while further reducing the cost.

特に、前記円周方向延在部を、内筒の外周面と、外筒の内周面とにそれぞれ、軸線方向に沿って互い違いに設け、内筒側接円の直径Dと、外筒側接円の直径dとをD>dに設定することで、当該円周方向延在部のそれぞれの先端をオーバーラップさせれば、上述した効果が一層顕著なものとなる。   In particular, the circumferentially extending portions are provided alternately along the axial direction on the outer peripheral surface of the inner cylinder and the inner peripheral surface of the outer cylinder, respectively, and the diameter D of the inner cylinder side tangent and the outer cylinder side By setting the diameter d of the tangent circle so that D> d, the above-described effects become more prominent if the tips of the circumferentially extending portions are overlapped.

特に、内筒側及び外筒側の円周方向延在部の少なくとも一方を、円周方向の全周に亘って形成された環状部にすれば、弾性部材を円周方向の全周に亘って保持することができるので、上述した効果が一層顕著なものとなる。   Particularly, if at least one of the circumferentially extending portions on the inner cylinder side and the outer cylinder side is an annular portion formed over the entire circumference in the circumferential direction, the elastic member extends over the entire circumference in the circumferential direction. Therefore, the above-described effect becomes more remarkable.

また、内筒側及び外筒側の円周方向延在部の少なくとも一方を、円周方向に沿って断続的に形成しても同様の効果を奏する。また、この場合、内筒側又は外筒側の一方の円周方向延在部と、内筒側又は外筒側の他方の円周方向延在部とを互いに軸線方向から見て干渉しないように円周方向にずらした状態で挿入し、そのまま円周方向に回転させれば、内筒側の円周方向延在部と外筒側の円周方向延在部とを容易に位置決めすることができる。   Moreover, even if at least one of the circumferentially extending portions on the inner cylinder side and the outer cylinder side is intermittently formed along the circumferential direction, the same effect can be obtained. Further, in this case, one circumferential extension portion on the inner cylinder side or the outer cylinder side and the other circumferential extension portion on the inner cylinder side or the outer cylinder side do not interfere with each other when viewed from the axial direction. If it is inserted in a state shifted in the circumferential direction and rotated in the circumferential direction as it is, the circumferentially extending portion on the inner cylinder side and the circumferentially extending portion on the outer cylinder side can be easily positioned. Can do.

更に、内筒側及び外筒側の前記円周方向延在部のうちの少なくとも一方の外周縁を、円周方向に沿って形成された凹凸形状とすれば、内筒と弾性部材との相互間に作用する応力(特に、円周方向に対するせん断力)や、外筒と弾性部材との相互間に作用する応力(特に、円周方向に対するせん断力)を有効に受けることができるので、より強固な接合を確保することができる。   Furthermore, if the outer peripheral edge of at least one of the circumferentially extending portions on the inner cylinder side and the outer cylinder side is an uneven shape formed along the circumferential direction, the inner cylinder and the elastic member Since it can effectively receive stress (especially shear force in the circumferential direction) acting between them and stress (especially shear force in the circumferential direction) acting between the outer cylinder and the elastic member, A strong bond can be secured.

また、内筒側及び外筒側の前記円周方向延在部のうちの少なくとも一方に、軸線方向に貫通する貫通孔を形成すれば、円周方向延在部の外周縁を、円周方向に沿って凹凸形状に形成した場合と同様の作用効果を奏する。   Further, if a through-hole penetrating in the axial direction is formed in at least one of the circumferentially extending parts on the inner cylinder side and the outer cylinder side, the outer peripheral edge of the circumferentially extending part is The same effect as the case where it forms in uneven | corrugated shape is exhibited.

更に、上述した発明の夫々の構成を適宜組み合わせれば、円周方向及び軸線方向の両方向に対する防振性能と耐久性能との向上が図れるため、防振性能と耐久性能とのより一層の向上を更なるコストの増大を招くことなく実現することができる。   Furthermore, if the respective configurations of the above-described invention are appropriately combined, the vibration proof performance and durability performance in both the circumferential direction and the axial direction can be improved, so that further improvement in vibration proof performance and durability performance can be achieved. This can be realized without causing further increase in cost.

また、本発明である上記防振具を用いて、防振具と送風用ファンとを有する送風用ファン構造体として一体に成形した場合、振動や騒音の発生が更に抑制された安価な送風用ファン構造体を提供することができる。   In addition, when the vibration isolator according to the present invention is used to integrally form a blower fan structure having a vibration isolator and a blower fan, the generation of vibration and noise can be further suppressed. A fan structure can be provided.

以下、図面を参照して、本発明の形態を詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

図1(a),(b)はそれぞれ、本発明の一形態である送風用ファン構造体1を示す斜視図及び、これにモータMを取り付けた状態を図1のX−X断面で模式的に示す要部断面図である。また、図2は、同形態に採用した防振具10を風上側(モータ取付側)から示す斜視図である。また、図3は、防振具10を、弾性部材13を省略した状態で風下側(モータ取付側と対向する側)から示す斜視図である。更に、図4,5はそれぞれ、防振具10を、その弾性部材13内で円周方向に加わる応力と共に示す斜視図及び、防振具10を、その自重方向に加わる応力と共に示す斜視図である。   1A and 1B are a perspective view showing a blower fan structure 1 according to one embodiment of the present invention, and a state where a motor M is attached to the blower fan structure 1 according to a cross section taken along line XX in FIG. It is principal part sectional drawing shown in FIG. FIG. 2 is a perspective view showing the vibration isolator 10 employed in the embodiment from the windward side (motor mounting side). FIG. 3 is a perspective view showing the vibration isolator 10 from the leeward side (side facing the motor mounting side) with the elastic member 13 omitted. 4 and 5 are a perspective view showing the vibration isolator 10 together with stress applied in the circumferential direction in the elastic member 13, and a perspective view showing the vibration isolator 10 together with stress applied in the direction of its own weight. is there.

符号11は、モータMの出力軸(以下、「モータ軸」という)Msに固定する嵌合孔11aを有する内筒である。内筒11の外周面11fには、図2等に示すように、内筒11の円周方向θに間隔を空けて、この内筒11からモータ回転軸線(以下、「軸線」という)OM方向に沿って延在する8つの軸線方向延在部11pが一体に設けられている(図2では符号11pを例示的に2箇所に付記)。軸線方向延在部11pは、同図に示すように、軸線OMから放射状に半径方向外側に突出する。 Reference numeral 11 denotes an inner cylinder having a fitting hole 11a that is fixed to an output shaft (hereinafter referred to as “motor shaft”) Ms of the motor M. As shown in FIG. 2 and the like, the outer peripheral surface 11f of the inner cylinder 11 is spaced from the inner cylinder 11 in the circumferential direction θ by a motor rotation axis (hereinafter referred to as “axis”) O M. Eight axially extending portions 11p extending along the direction are integrally provided (in FIG. 2, the reference numeral 11p is illustratively added to two locations). Axially extending portion 11p, as shown in the figure, projecting radially outwardly radially from the axis O M.

符号12は、その内側に内筒11を配置する外筒である。外筒12は、図1に示すように、送風用ファン1を保持する保持面12aを有し、図3に示すように風下側には、保持面12aよりも外径の大きなフランジ部12bが形成されている。   Reference numeral 12 denotes an outer cylinder in which the inner cylinder 11 is disposed. As shown in FIG. 1, the outer cylinder 12 has a holding surface 12a for holding the blower fan 1. On the leeward side, as shown in FIG. 3, a flange portion 12b having a larger outer diameter than the holding surface 12a is provided. Is formed.

また、外筒12の内周面12fには、図3に示すように、円周方向θに間隔を空けて、この外筒12から軸線OM方向に沿って延在する8つの軸線方向延在部12pが一体に設けられている(図3では、符号12を例示的に2箇所に付記)。軸線方向延在部12pは、同図に示すように、軸線OMに向かって半径方向内側に突出する。 Further, the inner peripheral surface 12f of the outer tube 12, as shown in FIG. 3, at intervals in the circumferential direction theta, 8 one axial extension that extends along from the outer cylinder 12 in the axial O M direction The existing portion 12p is provided integrally (in FIG. 3, reference numeral 12 is added to two locations as an example). Axially extending portion 12p, as shown in the figure, projecting radially inwardly toward the axis O M.

本形態では、内筒11の最外径、即ち、図2に示すように、軸線OMを中心として内筒11の外周面11fに設けた8つの軸線方向延在部11pの先端e11に接する内筒側接円の直径(以下、「内筒側先端径」という。)を符号Dとする一方、
外筒12の最内径、即ち、図2に示すように、軸線OMを中心として外筒12の内周面12fに設けた8つの軸線方向延在部12pの先端e12に接する外筒側接円の直径(以下、「外筒側先端径」という。)を符号dとすると共に、
内筒側先端径Dと外筒側先端径dとをD>dに設定する。
In this embodiment, the outermost diameter of the inner cylinder 11, i.e., as shown in FIG. 2, in contact with the eight axial extending portion 11p of the tip e11 provided on the outer peripheral surface 11f of the inner cylinder 11 around the axis O M While the diameter of the inner cylinder side tangent circle (hereinafter referred to as “inner cylinder side tip diameter”) is denoted by D,
The innermost diameter of the outer cylinder 12, i.e., as shown in FIG. 2, the outer tube side contact in contact with the inner peripheral surface leading end of the eight axial extending portion 12p provided to 12f e12 of the outer tube 12 about the axis O M The diameter of the circle (hereinafter referred to as “outer cylinder side tip diameter”) is denoted by d,
The inner cylinder side tip diameter D and the outer cylinder side tip diameter d are set to D> d.

内筒11と外筒12とは、図2に例示するように、軸線方向延在部11p,12pが互い違いになるように同軸配置して、軸線方向延在部11p,12pそれぞれの先端e11,e12を半径方向でオーバーラップさせる。これにより、その相互間に、円周方向θに沿って16箇所の半閉鎖領域AXを有する連続空間R1を形成している(図では符号e11,e12,AXを例示的に2箇所に付記)。 As illustrated in FIG. 2, the inner cylinder 11 and the outer cylinder 12 are arranged coaxially so that the axially extending portions 11p and 12p are staggered, and the distal ends e11 and the axially extending portions 11p and 12p, e12 is overlapped in the radial direction. As a result, a continuous space R1 having 16 semi-closed regions A X along the circumferential direction θ is formed between them (in the figure, the symbols e11, e12, and A X are illustrated at two locations by way of example). (Appendix).

連続空間R1には、内筒11と外筒12とをインサート部品として、変形及び復元の可能なスチレン系エラストマ(SBS、SEBS)、オレフィン系エラストマ(TPO)を始めとする各種熱可塑性エラストマを用いることで、図2に示すように、弾性部材13が一体に成形される。   For the continuous space R1, various thermoplastic elastomers such as styrene elastomer (SBS, SEBS) and olefin elastomer (TPO) that can be deformed and restored are used with the inner cylinder 11 and the outer cylinder 12 as insert parts. Thus, as shown in FIG. 2, the elastic member 13 is integrally formed.

なお、弾性部材13を構成する材料としては、各種熱可塑性エラストマ以外に、クロロプレンゴム(CR)、二トリルゴム(NBR)、エチレンプロピレンゴム(EPR、EPDM)等の各種加硫ゴムを用いる等、既存の材料を流用することができる。   In addition, as the material constituting the elastic member 13, in addition to various thermoplastic elastomers, various vulcanized rubbers such as chloroprene rubber (CR), nitrile rubber (NBR), ethylene propylene rubber (EPR, EPDM) are used. The material can be diverted.

本形態に係る防振具10によれば、内筒側先端径Dと、外筒側先端径dとをD>dに設定すると共に、これらを互い違いになるように配置して、内筒11と外筒12との間に、円周方向θ周りに沿って複数の半閉鎖領域Axを有する連続空間R1を形成し、この連続空間R1に、弾性部材13を設けたことから、弾性部材13における、軸線OMに直交する断面形状は、図2に示すように、内筒側の軸線方向延在部11pと、外筒側の軸線方向延在部12pとが円周方向θに沿って交互に差し込まれた形状となる。 According to the vibration isolator 10 according to the present embodiment, the inner cylinder-side tip diameter D and the outer cylinder-side tip diameter d are set to D> d, and these are arranged alternately so that the inner cylinder 11 A continuous space R1 having a plurality of semi-closed regions Ax is formed along the circumferential direction θ between the outer cylinder 12 and the outer cylinder 12, and the elastic member 13 is provided in the continuous space R1. in cross-sectional shape orthogonal to the axis O M, as shown in FIG. 2, the axial extending portion 11p of the inner tube side, the axial extending portion 12p of the outer tube side is along the circumferential direction θ The shape is inserted alternately.

このため、弾性部材13の内部にモータ軸OM周り(円周方向θ)に応力σが生じると、この円周方向θに生じる応力は、内筒外周面11fとの接合面と外筒内周面12fとの接合面とに加え、内筒側軸線方向延在部11pと、外筒側軸線方向延在部12pとで受けることになる。従って、防振具10を送風用ファン1に取付けて回転させるとモータMからの回転力は、防振具10の内筒11から弾性部材13を介して送風用ファン1を保持する外筒12に伝えられる。 Therefore, when the internal stress in the motor shaft O M around (circumference theta) sigma of the elastic member 13 occurs, the stress generated in the circumferential direction theta is the inner cylindrical outer peripheral surface 11f and the joint surface and the outer cylinder of the In addition to the joint surface with the peripheral surface 12f, it is received by the inner cylinder side axial direction extending portion 11p and the outer cylinder side axial direction extending portion 12p. Accordingly, when the vibration isolator 10 is attached to the blower fan 1 and is rotated, the rotational force from the motor M causes the outer cylinder 12 to hold the blower fan 1 from the inner cylinder 11 of the vibration isolator 10 via the elastic member 13. To be told.

また、かかる構成によれば、回転にあたり、内筒側軸線方向延在部11p(外筒側軸線方向延在部12p)から半閉鎖領域Axを通って弾性部材13の一部が膨出すると、この膨出部分は、内筒側軸線方向延在部11p(外筒側軸線方向延在部12p)と隣り合う外筒側軸線方向延在部12p(内筒側の軸線方向延在部11p)に偏るが、この偏りは、内筒側軸線方向延在部11p(外筒側軸線方向延在部12p)と隣り合う外筒側軸線方向延在部12p(内筒側の軸線方向延在部11p)で保持される。即ち、円周方向θに沿って連続的なせん断力等の応力σを生じても、かかる応力σは、剛性の高い内筒11及び外筒12の軸線方向延在部11p,12pによって確実に保持される。   Further, according to this configuration, when rotating, when a part of the elastic member 13 bulges through the semi-closed region Ax from the inner cylinder side axial direction extending portion 11p (outer cylinder side axial direction extending portion 12p), This bulging portion is formed by the outer cylinder side axial extension part 12p (the inner cylinder side axial extension part 11p) adjacent to the inner cylinder side axial extension part 11p (the outer cylinder side axial extension part 12p). However, this bias is the outer cylinder side axial extension part 12p (the inner cylinder side axial extension part) adjacent to the inner cylinder side axial extension part 11p (the outer cylinder side axial extension part 12p). 11p). That is, even when a stress σ such as a continuous shearing force is generated along the circumferential direction θ, the stress σ is reliably generated by the axially extending portions 11p and 12p of the inner cylinder 11 and the outer cylinder 12 having high rigidity. Retained.

この結果、弾性部材13にて、その円周θ方向に連続的に作用する応力σは軸線方向延在部11p,12pで分断されることにより抑制され、弾性部材13の耐久性、ひいては、防振具10の耐久性を容易に向上させることができる。また、互いに隣り合う軸線方向延在部11p,12p間に形成された開放領域Amでも、圧縮作用と伸張作用とが働くことで、防振具としての制振効果、特にトルク変動時の回転(円周)方向θにおける制振効果を向上させることができる。 As a result, the stress σ continuously acting in the circumferential θ direction in the elastic member 13 is suppressed by being divided by the axially extending portions 11p and 12p, and the durability of the elastic member 13 and thus the prevention The durability of the vibration tool 10 can be easily improved. Further, the axial extending portion 11p adjacent to each other, even open area A m formed between 12p, by acting compression action and the stretching action, damping effect as anti blowfish, especially rotation during torque fluctuation The vibration damping effect in the (circumferential) direction θ can be improved.

また、弾性部材13にて、その半径方向(軸線OMに向かう方向)に応力が加わる場合も、図5に示すように、弾性部材13に係る、内筒外周面11fと外筒内周面12fとの間、内筒外周面11fと外筒側軸線方向延在部12pとの間、外筒内周面12fと内筒側軸線方向延在部11pとの間、並びに、内筒側軸線方向延在部11p及び外筒側軸線方向延在部12pの間での弾性力によって確実に抑制される。 Further, an elastic member 13, even if the stress is applied in the radial direction (direction toward the axis line O M), as shown in FIG. 5, according to the elastic member 13, inner cylindrical outer peripheral surface 11f and the outer cylinder peripheral surface 12f, between the inner cylinder outer peripheral surface 11f and the outer cylinder side axially extending portion 12p, between the outer cylinder inner peripheral surface 12f and the inner cylinder side axially extending portion 11p, and the inner cylinder side axial line It is reliably suppressed by the elastic force between the direction extending part 11p and the outer cylinder side axial direction extending part 12p.

更に、弾性部材13における、軸線OMと直交する断面形状は、図2等に示すように、内筒側軸線方向延在部11pと、外筒側軸線方向延在部12pとが円周方向θに沿って交互に差し込まれた形状となることから、弾性部材13と内筒11との接合面積及び弾性部材13と外筒12の接合面積が増大するため、内筒11及び外筒12と弾性部材13との接合状態がより強固になると共に、内筒11及び外筒12と弾性部材13との接合面にて生じる応力も軽減される。 Further, the elastic member 13, the cross-sectional shape perpendicular to the axis O M, as shown in FIG. 2 or the like, an inner cylinder-side axis extending portion 11p, the outer tube side axially extending portion 12p and is circumferentially Since the shape is alternately inserted along θ, the joining area between the elastic member 13 and the inner cylinder 11 and the joining area between the elastic member 13 and the outer cylinder 12 are increased. The joining state with the elastic member 13 becomes stronger, and the stress generated at the joining surface between the inner cylinder 11 and the outer cylinder 12 and the elastic member 13 is also reduced.

このため、従来の課題となっていた弾性部材13の耐久性能に影響を及ぼすクリープ変形や疲労破断の要因となる、弾性部材13の面積(厚み)増大や、材料の選定による硬度低下があっても、これらを行うことにより、効果的な防振性能を得ることができると共に、耐久性能の向上を図ることができる。つまり、相反する特性を有する防振性能の向上と耐久性能の向上との両立を図ることができる。   For this reason, there is an increase in the area (thickness) of the elastic member 13 and a decrease in hardness due to the selection of the material, which causes creep deformation and fatigue rupture which affect the durability performance of the elastic member 13 which has been a conventional problem. However, by performing these, it is possible to obtain effective vibration isolation performance and to improve durability performance. That is, it is possible to achieve both the improvement of the vibration isolation performance having the contradictory characteristics and the improvement of the durability performance.

また、クリープ変形などを抑制し耐久性能を高めるにあたり、硬度の高い材料を積極的に採用する必要がないことから、材質や硬度の選定が容易になり、開発時の検証時間の短縮と共に製造時の品質管理や識別管理も容易になる。更に、弾性部材13の半径方向肉厚を変更する必要がないから、内筒11及び外筒12の製造金型や内筒11と外筒12との間に弾性部材13を成形する際の製造金型を流用することで共通化できる。   In addition, it is not necessary to aggressively adopt materials with high hardness in order to suppress creep deformation and improve durability performance, making it easier to select materials and hardness, reducing verification time during development, and manufacturing Quality control and identification management are also facilitated. Further, since it is not necessary to change the radial thickness of the elastic member 13, the inner cylinder 11 and the outer cylinder 12 are manufactured at the time of manufacturing, and the elastic member 13 is manufactured between the inner cylinder 11 and the outer cylinder 12. Can be shared by diverting the mold.

即ち、防振具10によれば、相反する特性を有する防振性能の向上と耐久性能の向上との両立をコストの増大を招くことなく実現することができる。   That is, according to the vibration isolator 10, it is possible to realize both the improvement of the vibration isolation performance having the contradictory characteristics and the improvement of the durability performance without causing an increase in cost.

また、防振性能や耐久性能について、用途等に応じてより広範囲の調整を行うにあたっては、内筒11及び外筒12に設けた軸線方向延在部11p,12pの形状、円周方向θの幅、軸線OM方向の長さ、高さ、又は、軸線方向延在部11p,12pの個数を適宜変更・組み合わせるだけでよい。このため、本形態によれば、防振性能や耐久性能について、用途等に応じたより広範囲の調整を容易に実現することができる。   In addition, when performing a wider range of adjustment for vibration-proof performance and durability performance depending on the application, the shape of the axially extending portions 11p, 12p provided in the inner cylinder 11 and the outer cylinder 12, the circumferential direction θ The width, the length in the axis OM direction, the height, or the number of the axially extending portions 11p, 12p may be changed or combined as appropriate. For this reason, according to the present embodiment, it is possible to easily realize a wider range of adjustment in accordance with the use etc. with respect to vibration proof performance and durability performance.

しかも、軸線方向延在部11p,12pそれぞれをオーバーラップさせたことで、互いに隣り合う軸線方向延在部11p、12pに形成された開放領域Amでは、図4に示す矢印のように、円周方向θの圧縮作用及び伸張作用が、より効率的に発生する。 Moreover, since the axial line direction extending portion 11p, respectively 12p are overlapped, the open area A m are formed axially extending portion 11p, 12p adjacent to each other, as indicated by arrows in FIG. 4, a circle The compression action and extension action in the circumferential direction θ occur more efficiently.

即ち、円周方向θに沿って連続的な応力σを生じても、円周方向θの圧縮作用及び伸張作用が開放領域Amに効率的に発生することで、かかる応力は、弾性部材13よりも剛性の高い軸線方向延在部11p,12pによって確実に抑制される。 That is, even if a continuous stress σ in the circumferential direction theta, by compression action and decompression action of circumferentially theta is efficiently generated in the open area A m, the stress, the elastic member 13 It is reliably suppressed by the axially extending portions 11p and 12p having higher rigidity.

従って、本形態の如く、軸線方向延在部11p,12pを、内筒外周面11fと、外筒内周面12fとにそれぞれ、円周方向に沿って互い違いに設け、内筒先端径Dと、外筒先端径dとをD>dに設定することで、軸線方向延在部11p,12pのそれぞれを半径方向でオーバーラップさせれば、上述した効果が一層顕著なものとなる。   Accordingly, as in the present embodiment, the axially extending portions 11p and 12p are provided alternately along the circumferential direction on the outer peripheral surface 11f of the inner cylinder and the inner peripheral surface 12f of the outer cylinder, respectively, By setting the outer cylinder tip diameter d to D> d so that the axially extending portions 11p and 12p overlap each other in the radial direction, the above-described effects become more remarkable.

図6は、防振具10の変形例であって、本発明の第二の形態としての防振具を、モータ取付側から示す斜視図である。   FIG. 6 is a perspective view showing a vibration isolator as a second embodiment of the present invention from the motor mounting side as a modification of the vibration isolator 10.

図1〜5に記載の形態では、内筒11の軸線方向延在部11pと外筒12の軸線方向延在部12pとの個数が同数で、互い違いであったのに対し、本形態では、内筒11の軸線方向延在部11pが外筒12の軸線方向延在部12pより少なく1つ飛びになるように構成されている。   1 to 5, the number of the axially extending portions 11p of the inner cylinder 11 and the number of the axially extending portions 12p of the outer cylinder 12 are the same and staggered, whereas in the present embodiment, The axially extending portion 11p of the inner cylinder 11 is configured to be less than the axially extending portion 12p of the outer cylinder 12 and jump one.

本形態は、内筒11の軸線方向延在部11pに変更を加えているが、かかる変更は、外筒12の軸線方向延在部12pであってもよい。   In the present embodiment, a change is made to the axially extending portion 11p of the inner cylinder 11, but the change may be the axially extending portion 12p of the outer cylinder 12.

図7は、防振具10の更に他の変形例であって、本発明の第三の形態としての防振具を、モータ取付側から示す斜視図である。   FIG. 7 is still another modified example of the vibration isolator 10, and is a perspective view showing the vibration isolator as a third embodiment of the present invention from the motor mounting side.

本発明において、内筒外周面11f又は外筒内周面12fから突出する軸線方向延在部11p,12pは、弾性部材13を介して受ける回転力や製品自重等による軸線OM方向の応力σ、又は、弾性部材13をゴム成形等する時の射出圧力や温度等を受けても変形や破損することなく防振具としての機能を維持するために、これら応力σに対して十分耐えうる強度が必要である。 In the present invention, axially extending portion 11p projecting from the inner cylindrical outer peripheral surface 11f or the outer cylinder peripheral surface 12f, 12p, the axis line by the rotation force and product own weight or the like received via the elastic member 13 O M direction of the stress σ Or strength enough to withstand these stresses σ in order to maintain the function as an anti-vibration device without being deformed or damaged even when subjected to injection pressure or temperature when the elastic member 13 is molded with rubber, etc. is required.

特に、軸線方向延在部11p,12pを薄肉のリブ形状で形成する場合は、上述の応力σに対して変形や破損を受け易く、新たに解決すべき課題となる。   In particular, when the axially extending portions 11p and 12p are formed in a thin rib shape, the above-described stress σ is easily deformed or damaged, which is a new problem to be solved.

この対策としては、リブ形状の肉厚を増加させる方法があるが、例えば、内筒11p(外筒12p)が樹脂成形品である場合は、厚肉部の形成に伴いヒケ(局所的変形)やボイド(気泡)が発生すると共に、使用原材料の増加や成形時間の増加を免れない。   As a countermeasure, there is a method of increasing the thickness of the rib shape. For example, when the inner cylinder 11p (outer cylinder 12p) is a resin molded product, sink (local deformation) occurs with the formation of the thick portion. And voids (bubbles) are generated, and an increase in raw materials used and an increase in molding time are inevitable.

そこで、本形態の如く、外筒側軸線方向延在部12pを、例えば射出成形に用いる金型により、外筒内周面12fと共にその外周面12aを半径方向内側に突出させて形成すれば、軸線方向延在部12pの厚みを増して強度向上が図れると共に外周面からの肉盗み形状(凹形状)により、上述した新たな課題も解決することができる。   Therefore, as in this embodiment, if the outer cylinder side axially extending portion 12p is formed by, for example, a mold used for injection molding, the outer peripheral surface 12a together with the outer peripheral surface 12f of the outer cylinder is projected radially inward. The strength can be improved by increasing the thickness of the axially extending portion 12p, and the above-described new problem can be solved by the stealing shape (concave shape) from the outer peripheral surface.

図8は、本発明の第四の形態である送風用ファンの防振具20を、モータ取付側から軸線OMを含む断面にて示す斜視断面図である。なお、同図は、防振具20を、弾性部材13を省略した状態で示し、また、先に説明した部分と同一の部分は、同一符号をもって、その説明を省略する。 8, the fourth blowing fan of explosion puffer 20 is in the form of the present invention, is a perspective cross-sectional view illustrating the motor mount side in cross-section including the axis O M. In the figure, the vibration isolator 20 is shown with the elastic member 13 omitted, and the same parts as those described above are denoted by the same reference numerals, and the description thereof is omitted.

本形態は、内筒11の外周面11fに、この内筒11から円周方向θに沿って延在する円周方向延在部21pが一体に設けられている。円周方向延在部21pは、同図に示すように、軸線OM方向に沿った所定位置(例えば、軸線OM方向の中心位置)で、軸線OMから半径方向外側に向かって突出し、円周θ方向の全周に亘って環状に形成されている。 In this embodiment, a circumferentially extending portion 21p extending from the inner cylinder 11 along the circumferential direction θ is integrally provided on the outer peripheral surface 11f of the inner cylinder 11. Circumferentially extending portion 21p, as shown in the figure, a predetermined position along the axial line O M direction (e.g., the center position in the axial O M direction), the radially outwardly from the axis O M protrudes It is formed in an annular shape over the entire circumference in the circumferential θ direction.

これにより、内筒11と外筒12との間を弾性部材13で一体に連結するにあたり、内筒11と外筒12との間には、軸線OM方向に沿って1つの半閉鎖領域AYを有する連続空間R2が形成され、この連続空間R2に弾性部材13を設けることができる。 Thus, when the inner cylinder 11 and the outer cylinder 12 are integrally connected by the elastic member 13, one semi-closed region A is provided between the inner cylinder 11 and the outer cylinder 12 along the axis OM direction. A continuous space R2 having Y is formed, and the elastic member 13 can be provided in the continuous space R2.

本形態の如く、内筒11に、円周方向延在部21pを設ければ、例えば、送風用ファン1の自重等により、防振具20に軸線OM方向の負荷がかかった場合、弾性部材13の偏りを円周方向延在部21pで軸線OM方向に対して保持することで、当該弾性部材13に発生する軸線OM方向に生じる応力σを抑制できると共に、永久ひずみ(クリープ変形)の抑制も可能となる。 As in the present embodiment, the inner cylinder 11, by providing the circumferential extending portion 21p, for example, by the weight or the like of the blower fan 1, when the load of the axial line O M direction explosion puffer 20 is applied, the elastic by holding the bias member 13 relative to the axis O M direction circumferentially extending portion 21p, with a stress generated in the axial O M direction generated in the elastic member 13 sigma can be suppressed, the permanent strain (creep deformation ) Can also be suppressed.

この結果、弾性部材13内で、その軸線OM方向に連続的に作用する応力σは円周方向延在部21pで分断されることにより抑制され、弾性部材13の耐久性、ひいては、防振具20の耐久性を容易に向上させることができる。また、円周方向延在部21pにより弾性部材13の圧縮作用と伸張作用とが軸線OM方向に沿って働くことで、防振具20としての制振効果、特に軸線OM方向における制振効果を向上させることができる。 As a result, an elastic member within 13, the stress σ acting continuously in the axial O M direction is suppressed by being divided in the circumferential direction extending portion 21p, the durability of the elastic member 13, and thus, vibration isolation The durability of the tool 20 can be easily improved. In addition, by the circumferential extending portion 21p and the compression action and stretching action of the elastic member 13 acts in the axial O M direction, the damping effect of the explosion puffer 20, in particular the damping of the axial O M direction The effect can be improved.

更に、円周方向延在部21pを設けたことで、弾性部材13における、軸線OMを含む断面形状は、内筒21側の円周方向延在部21pが軸線OMに沿って差し込まれた形状となるから、弾性部材13と内筒11との接合面積が増大するため、内筒11と弾性部材13との接合状態がより強固になると共に、内筒11と弾性部材13との接合面にて生じる応力σも軽減される。 Further, by providing the circumferential extending portion 21p, the elastic member 13, the sectional shape including the axis O M is circumferentially extending portion 21p of the inner cylinder 21 side is inserted along the axis O M Since the joining area between the elastic member 13 and the inner cylinder 11 increases, the joining state between the inner cylinder 11 and the elastic member 13 becomes stronger and the joining between the inner cylinder 11 and the elastic member 13 The stress σ generated on the surface is also reduced.

このため、第一〜第三の形態と同様、従来の課題となっていた弾性部材13の耐久性能に影響を及ぼすクリープ変形や疲労破断の要因となる、弾性部材13の面積(厚み)増大や、材料の選定による硬度低下があっても、これらを行うことにより、効果的な防振性能を得ることができると共に、耐久性能の向上を図ることができる。つまり、相反する特性を有する防振性能の向上と耐久性能の向上との両立を図ることができる。   For this reason, as in the first to third embodiments, the area (thickness) of the elastic member 13 is increased, which is a factor of creep deformation and fatigue rupture affecting the durability performance of the elastic member 13, which has been a conventional problem. Even if there is a decrease in hardness due to the selection of the material, by performing these, it is possible to obtain effective vibration isolation performance and to improve durability performance. That is, it is possible to achieve both the improvement of the vibration isolation performance having the contradictory characteristics and the improvement of the durability performance.

また、クリープ変形などを抑制し耐久性能を高めるにあたり、硬度の高い材料を積極的に採用する必要がないから、材質や硬度の選定が容易になり、開発時の検証時間の短縮と共に製造時の品質管理や識別管理も容易になる。更に、弾性部材13の半径方向肉厚を変更する必要がないから、内筒11及び外筒12の製造金型や内筒11と外筒12との間に弾性部材13を成形する際の製造金型を流用することで共通化できる。   In addition, in order to suppress creep deformation and improve durability, it is not necessary to aggressively adopt materials with high hardness, making it easy to select materials and hardness, reducing verification time during development, and reducing manufacturing time. Quality management and identification management become easy. Further, since it is not necessary to change the radial thickness of the elastic member 13, the inner cylinder 11 and the outer cylinder 12 are manufactured at the time of manufacturing, and the elastic member 13 is manufactured between the inner cylinder 11 and the outer cylinder 12. Can be shared by diverting the mold.

即ち、本形態によれば、相反する特性を有する防振性能の向上と耐久性能の向上との両立をコストの増大を招くことなく実現することができる。   That is, according to the present embodiment, it is possible to realize both the improvement of the anti-vibration performance having the contradictory characteristics and the improvement of the durability performance without causing an increase in cost.

図9は、防振具20の変形例であって、本発明の第五の形態としての防振具を、モータ取付側から軸線OMを含む断面にて示す斜視断面図である。なお、同図も、防振具20を、弾性部材13を省略した状態で示し、また、先に説明した部分と同一の部分は、同一符号をもって、その説明を省略する。 Figure 9 is a modification of the anti-blowfish 20, the anti-blowfish as a fifth embodiment of the present invention, is a perspective cross-sectional view illustrating the motor mount side in cross-section including the axis O M. In this figure, the vibration isolator 20 is shown with the elastic member 13 omitted, and the same parts as those described above are denoted by the same reference numerals, and the description thereof is omitted.

本形態は、外筒12の内周面12fに、この外筒12から円周方向θに沿って延在する円周方向延在部22pが一体に設けられている。円周方向延在部22pも、同図に示すように、軸線OM方向に沿った所定位置(例えば、軸線OM方向の中心位置)で、軸線OMに向かって半径方向内側に突出し、円周方向θの全周に亘って環状に形成されている。 In this embodiment, a circumferentially extending portion 22p extending from the outer cylinder 12 along the circumferential direction θ is integrally provided on the inner peripheral surface 12f of the outer cylinder 12. Circumferentially extending portion 22p also, as shown in the figure, at a predetermined position along the axial line O M direction (e.g., the axis O M direction center position), projecting radially inwardly toward the axis O M, It is formed in an annular shape over the entire circumference in the circumferential direction θ.

これにより、内筒11と外筒12との間を弾性部材13で一体に連結するにあたり、内筒11と外筒12との間にも、軸線OM方向に沿って1つの半閉鎖領域AYを有する連続空間R2が形成され、この連続空間R2に弾性部材13を設けることができる。 As a result, when the inner cylinder 11 and the outer cylinder 12 are integrally connected by the elastic member 13, one semi-closed region A is also provided between the inner cylinder 11 and the outer cylinder 12 along the axis OM direction. A continuous space R2 having Y is formed, and the elastic member 13 can be provided in the continuous space R2.

本形態の如く、外筒12に、円周方向延在部22pを設けても、弾性部材13に発生する軸線OM方向に生じる応力σを抑制できると共に、永久ひずみ(クリープ変形)の抑制も可能となる。 As in the present embodiment, the outer cylinder 12, be provided with a circumferential extending portion 22p, it is possible to suppress the axial line O M generated in the direction stress σ generated in the elastic member 13, also inhibit permanent distortion (creep deformation) It becomes possible.

この場合も、弾性部材13内で、その軸線OM方向に連続的に作用する応力σは円周方向延在部22pで分断されることにより抑制され、弾性部材13の耐久性、ひいては、防振具20の耐久性を容易に向上させることができる。また、円周方向延在部22pによっても弾性部材13の圧縮作用と伸張作用とが軸線方向OMに沿って働くことで、防振具20としての制振効果、特に軸線OM方向における制振効果を向上させることができる。 Again, a resilient member within 13, the stress σ acting continuously in the axial O M direction is suppressed by being divided in the circumferential direction extending portion 22p, the durability of the elastic member 13, and thus, anti The durability of the vibration tool 20 can be easily improved. Moreover, that the compression action and stretching action of the elastic member 13 by circumferentially extending portion 22p acts in the axial direction O M, damping effect as anti blowfish 20, in particular control in the axial O M direction The vibration effect can be improved.

更に、円周方向突出部22pを設けたことで、弾性部材13における、軸線OMを含む断面形状は、外筒22側の円周方向延在部22pが軸線OMに沿って差し込まれた形状となるから、弾性部材13と外筒12との接合面積が増大するため、外筒12と弾性部材13との接合状態がより強固になると共に、外筒12と弾性部材13との接合面にて生じる応力σも軽減される。 Further, by providing the circumferential protruding portion 22p, the elastic member 13, the sectional shape including the axis O M is circumferentially extending portion 22p of the outer tube 22 side is inserted along the axis O M Since the joint area between the elastic member 13 and the outer cylinder 12 is increased, the joint state between the outer cylinder 12 and the elastic member 13 becomes stronger and the joint surface between the outer cylinder 12 and the elastic member 13 The stress σ generated in is also reduced.

このため、第四の形態と同様、従来の課題となっていた弾性部材13の耐久性能に影響を及ぼすクリープ変形や疲労破断の要因となる、弾性部材13の面積(厚み)増大や、材料の選定による硬度低下であっても、これらを行うことにより、効果的な防振性能を得ることができると共に、耐久性能の向上を図ることができる。つまり、相反する特性を有する防振性能の向上と耐久性能の向上との両立を図ることができる。   For this reason, as in the fourth embodiment, the area (thickness) of the elastic member 13 is increased, which causes creep deformation and fatigue rupture, which affect the durability performance of the elastic member 13, which has been a conventional problem. Even if the hardness is reduced due to the selection, by performing these, it is possible to obtain effective vibration isolation performance and to improve durability performance. That is, it is possible to achieve both the improvement of the vibration isolation performance having the contradictory characteristics and the improvement of the durability performance.

また、クリープ変形などを抑制し耐久性能を高めるにあたっても、第四の形態と同様、硬度の高い材料を積極的に採用する必要がないから、材質や硬度の選定が容易になり、開発時の検証時間の短縮と共に製造時の品質管理や識別管理も容易になる。また、第四の形態と同様、弾性部材13の半径方向肉厚を変更する必要がないから、内筒11及び外筒12の製造金型や内筒11と外筒12との間に弾性部材13を成形する際の製造金型を流用することで共通化できる。   Also, in order to suppress creep deformation and improve durability performance, it is not necessary to actively adopt a material with high hardness, as in the case of the fourth embodiment, so it is easy to select the material and hardness, and at the time of development As well as shortening the verification time, quality control and identification management at the time of manufacture become easy. Further, as in the fourth embodiment, since it is not necessary to change the radial thickness of the elastic member 13, the elastic member between the inner cylinder 11 and the outer cylinder 12 or the inner cylinder 11 and the outer cylinder 12 is manufactured. It can be made common by diverting the production mold when molding 13.

即ち、本形態によっても、相反する特性を有する防振性能の向上と耐久性能の向上との両立をコストの増大を招くことなく実現することができる。   That is, according to this embodiment, it is possible to realize both the improvement of the vibration isolating performance having the contradictory characteristics and the improvement of the durability performance without causing an increase in cost.

図10は、図8及び図9に記載の構成を組み合わせた防振具20の更に他の変形例であって、本発明の第六の形態としての防振具を、モータ取付側から軸線OMを含む断面にて示す斜視断面図である。なお、同図も、防振具20を、弾性部材13を省略した状態で示し、また、先に説明した部分と同一の部分は、同一符号をもって、その説明を省略する。 FIG. 10 shows still another modified example of the vibration isolator 20 in which the configurations shown in FIGS. 8 and 9 are combined, and the vibration isolator according to the sixth embodiment of the present invention is connected to the axis O from the motor mounting side. 2 is a perspective sectional view showing a section including M. FIG. In this figure, the vibration isolator 20 is shown with the elastic member 13 omitted, and the same parts as those described above are denoted by the same reference numerals, and the description thereof is omitted.

本形態では、内筒11の最外径、即ち、同図に示すように、軸線OMを中心として内筒11の外周面11fに設けた円周方向延在部21pの先端e21に接する内筒先端径Dと、
外筒12の最内径、即ち、同図に示すように、軸線OMを中心として外筒12の内周面12fに設けた円周方向延在部22pの先端e22に接する外筒先端径dとをD>dに設定し、円周方向延在部21p,22pが互いに干渉しないように離して同軸配置する。
In this embodiment, the outermost diameter of the inner cylinder 11, i.e., as shown in the figure, inner contact circumferentially extending portion 21p of the tip e21 provided on the outer peripheral surface 11f of the inner cylinder 11 around the axis O M A tube tip diameter D;
The innermost diameter of the outer cylinder 12, i.e., as shown in the drawing, barrel tip diameter in contact with the circumferentially extending portion 22p of the tip e22 provided on the inner peripheral surface 12f of the outer cylinder 12 around the axis O M d Are set so that D> d, and the circumferentially extending portions 21p, 22p are arranged coaxially apart from each other so as not to interfere with each other.

また、内筒11と外筒12とは、同図に例示するように、円周方向延在部21p,22pそれぞれの先端e21,e22を軸線OM方向から見てオーバーラップさせる。これにより、その相互間に、軸線OM方向に沿って半閉鎖領域AYを有する連続空間R2を形成している。 Further, the inner cylinder 11 and the outer cylinder 12, as illustrated in the figure, the circumferential extending portion 21p, to overlap a look at 22p each tip e21, e22 from axis O M direction. Thus, the mutual to form a continuous space R2 with semi-closed area A Y in the axial O M direction.

本形態によれば、弾性部材13における、軸線OMを含む断面形状は、内筒11側の円周方向延在部21pと、外筒12側の円周方向延在部22pとが軸線OM方向に沿って交互に差し込まれた形状となる。 According to this embodiment, the elastic member 13, the sectional shape including the axis O M has a circumferential extending portion 21p of the inner cylinder 11 side, of the outer cylinder 12 side and the circumferential extending portion 22p axis O The shape is alternately inserted along the M direction.

このため、軸線OM方向に応力σが生じて、外筒側円周方向延在部22p(内筒側円周方向延在部21p)から半閉鎖領域AYを通って弾性部材13の一部が膨出すると、この膨出部分は、外筒側円周方向延在部22p(内筒側円周方向延在部21p)と隣り合う内筒側円周方向延在部21p(外筒側円周方向延在部22p)に偏るが、この偏りは、内筒側円周方向延在部21p(外筒側円周方向延在部22p)と隣り合う外筒側円周方向延在部22p(内筒側円周方向延在部21p)で保持される。即ち、軸線OM方向に沿って連続的な応力σを生じても、かかる応力σは、剛性の高い内筒11及び外筒12の円周方向延在部21p,22pによって確実に抑制される。 Therefore, the stress σ is generated in the axial O M direction, one elastic member 13 from the outer cylinder side circumference extending portion 22p (the inner cylinder side circumference extending portion 21p) through the semi-closed area A Y When the portion bulges, the bulging portion is formed by the inner cylinder side circumferential extension portion 21p (outer cylinder) adjacent to the outer cylinder side circumferential extension portion 22p (inner cylinder side circumferential extension portion 21p). Side circumferential extending portion 22p), but this bias extends to the outer cylinder side circumferential direction adjacent to the inner cylinder side circumferential extension portion 21p (outer cylinder side circumferential extension portion 22p). It is held by the portion 22p (inner cylinder side circumferential direction extending portion 21p). That is, even if the axial line O M direction along continuously stress sigma, the stress sigma, circumferentially extending portion 21p of the inner tube 11 and the outer cylinder 12 having high rigidity, is reliably suppressed by 22p .

この結果、弾性部材13にて、その軸線OM方向に連続的に作用する応力σは円周方向延在部21p,22pで分断されることにより抑制され、弾性部材13の耐久性、ひいては、防振具の耐久性を容易に向上させることができる。また、互いに隣り合う円周方向延在部21p,22p間に形成された開放領域Amでも、軸線OM方向に沿って圧縮作用と伸張作用とが働くことで、防振具としての制振効果、特に軸線OM方向における制振効果を更に向上させることができる。 As a result, an elastic member 13, the stress σ acting continuously in the axial O M direction is suppressed by being divided circumferentially extending portion 21p, in 22p, the durability of the elastic member 13, and thus, The durability of the vibration isolator can be easily improved. Further, the circumferential extending portion 21p adjacent to each other, even open area A m formed between 22p, by working with compression action and the expansion action along the axis O M direction, the damping of the proof blowfish effect can be particularly further improved vibration damping effect in the axial O M direction.

また、弾性部材13により構成される開放領域Am及び半閉鎖領域AYにて、その半径方向(軸線OMに向かう方向)に応力σが加わる場合も、当該弾性部材13に係る、内筒側外周面11fと外筒側内周面12fとの間、内筒側外周面11fと外筒側円周方向延在部22pとの間、外筒側内周面12fと内筒側円周方向延在部21pとの間及び、内筒側並びに外筒側円周方向延在部21p,22pでの弾性力によって確実に保持される。 Further, even when stress σ is applied in the radial direction (direction toward the axis O M ) in the open region Am and the semi-closed region A Y constituted by the elastic member 13, the inner cylinder according to the elastic member 13 Between the outer peripheral surface 11f and the outer cylinder side inner peripheral surface 12f, between the inner cylinder side outer peripheral surface 11f and the outer cylinder side circumferential extending portion 22p, and between the outer cylinder side inner peripheral surface 12f and the inner cylinder side circumference It is reliably held by the elastic force between the direction extending part 21p and at the inner cylinder side and the outer cylinder side circumferential direction extending parts 21p, 22p.

加えて、弾性部材13の軸線OM方向に沿った断面形状は、内筒側円周方向延在部21pと、外筒側円周方向延在部22pとが円周方向θに沿って交互に差し込まれた形状となることから、弾性部材13と内筒11との接合面積及び弾性部材13と外筒12の接合面積が増大するため、内筒11及び外筒12と弾性部材13との接合状態がより強固になると共に、内筒11及び外筒12と弾性部材13との接合面にて生じる応力σも軽減される。 In addition, the cross-sectional shape along the axis OM direction of the elastic member 13 is such that the inner cylinder side circumferential extension portion 21p and the outer cylinder side circumferential extension portion 22p alternate along the circumferential direction θ. Since the joining area between the elastic member 13 and the inner cylinder 11 and the joining area between the elastic member 13 and the outer cylinder 12 are increased, the inner cylinder 11, the outer cylinder 12, and the elastic member 13 The joining state becomes stronger, and the stress σ generated on the joining surface between the inner cylinder 11 and the outer cylinder 12 and the elastic member 13 is also reduced.

このため、従来の課題となっていた弾性部材13の面積(厚み)増大や、材料の選定による硬度低下があっても、これらを行うことにより、効果的な防振性能を得ることができると共に、耐久性能の向上を図ることができる。つまり、相反する特性を有する防振性能の向上と耐久性能の向上との両立を図ることができる。   For this reason, even if there is an increase in the area (thickness) of the elastic member 13, which has been a problem in the past, or a decrease in hardness due to the selection of the material, effective vibration isolation performance can be obtained by performing these. The durability performance can be improved. That is, it is possible to achieve both the improvement of the vibration isolation performance having the contradictory characteristics and the improvement of the durability performance.

また、クリープ変形などを抑制し耐久性能を高めるにあたり、硬度の高い材料を積極的に採用する必要がないことから、材質や硬度の選定が容易になり、開発時の検証時間の短縮と共に製造時の品質管理や識別管理も容易になる。更に、弾性部材13の半径方向肉厚を変更する必要がないから、内筒11及び外筒12の製造金型や内筒11と外筒12との間に弾性部材13を成形する際の製造金型を流用することで共通化できる。   In addition, it is not necessary to aggressively adopt materials with high hardness in order to suppress creep deformation and improve durability performance, making it easier to select materials and hardness, reducing verification time during development, and manufacturing Quality control and identification management are also facilitated. Further, since it is not necessary to change the radial thickness of the elastic member 13, the inner cylinder 11 and the outer cylinder 12 are manufactured at the time of manufacturing, and the elastic member 13 is manufactured between the inner cylinder 11 and the outer cylinder 12. Can be shared by diverting the mold.

即ち、内筒側先端径Dと、外筒側先端径dとをD≧dに設定すれば、相反する特性を有する防振性能の向上と耐久性能の向上との両立を更なるコストの低下を図りつつ実現することができる。   That is, if the inner cylinder-side tip diameter D and the outer cylinder-side tip diameter d are set to D ≧ d, both cost-reducing performance and anti-vibration performance having conflicting characteristics can be further reduced. It can be realized while planning.

また、図8〜10に記載の形態にて、防振性能や耐久性能についても、用途等に応じてより広範囲の調整を行うにあたっては、内筒11及び外筒12に設けた円周方向延在部21p,22pの形状、軸線OM方向の厚さ、半径方向の高さ、又は、円周方向延在部21p,22pの個数を適宜変更・組み合わせるだけでよい。このため、上述の各形態によれば、防振性能や耐久性能について、用途等に応じたより広範囲の調整を容易に実現することができる。 Further, in the form shown in FIGS. 8 to 10, the vibration-proof performance and the durability performance are adjusted in the circumferential direction provided in the inner cylinder 11 and the outer cylinder 12 in order to perform a wider range of adjustment depending on the application. extending portion 21p, the shape of 22p, the axis O M direction of thickness, the radial height or circumferential extending portion 21p, it is only appropriately changed, combining the number of 22p. For this reason, according to each above-mentioned form, more extensive adjustment according to a use etc. can be easily realized about vibration proof performance and endurance performance.

しかも、円周方向延在部21p,22pそれぞれをオーバーラップさせたことで、同図に示す矢印のように、互いに隣り合う円周方向延在部21p,22p間に形成された領域Amでは、軸線OM方向の圧縮作用及び伸張作用が、より効率的に発生する。 Moreover, since the circumferential extending portion 21p, respectively 22p are overlapped, as indicated by arrows in the figure, in the area A m are formed between circumferentially extending portion 21p, 22p adjacent to each other , compression action and decompression action of the axial O M direction, occurs more efficiently.

即ち、軸線OM方向に沿って連続的な応力σを生じても、軸線OM方向の圧縮作用及び伸張作用が領域Amに効率的に発生することで、かかる応力σは、剛性の高い円周方向延在部21p,22pによって確実に抑制される。 That is, even if the axial line O M direction along continuously stress sigma, by compression action and decompression action of the axial O M direction is efficiently generated in the area A m, the stress sigma is rigid The circumferentially extending portions 21p and 22p are surely restrained.

従って、本形態の如く、円周方向延在部21p,22pを、内筒外周面11fと、外筒内周面12fとにそれぞれ、軸線OM方向に沿って互いに干渉しないように離して同軸配置し、内筒先端径Dと、外筒先端径dとをD>dに設定することで、円周方向延在部21p,22pのそれぞれを軸線OM方向でオーバーラップさせれば、図8及び図9の形態における効果が一層顕著なものとなる。 Therefore, as in the present embodiment, the circumferential extending portion 21p, the 22p, and the inner cylindrical outer peripheral surface 11f, respectively to the outer cylinder inner peripheral surface 12f, apart so as not to interfere with each other in the axial O M direction coaxial arrangement, and the inner cylinder tip diameter D, and the barrel tip diameter d by setting the D> d, circumferentially extending portion 21p, if caused to overlap each 22p in the axial O M direction, 8 and the effect in the form of FIG. 9 becomes more remarkable.

特に、図8〜10に示す形態の如く、円周方向延在部21p,22pを、円周方向θの全周に亘って形成された環状部にすれば、弾性部材13を円周方向θの全周に亘って保持することができるので、上述した効果が一層顕著なものとなる。   In particular, if the circumferentially extending portions 21p and 22p are annular portions formed over the entire circumference in the circumferential direction θ as shown in FIGS. Therefore, the above-described effect becomes more remarkable.

図11は、図10に示す防振具の変形例であって、本発明の第七の形態としての防振具20を、モータ取付側から軸線OMを含む断面にて示す斜視断面図である。なお、同図も、防振具20を、弾性部材13を省略した状態で状態を示し、また、先に説明した部分と同一の部分は、同一符号をもって、その説明を省略する。 Figure 11 is a modification of the anti-blowfish shown in FIG. 10, the anti-blowfish 20 as a seventh embodiment of the present invention, in perspective cross-sectional view illustrating the motor mount side in cross-section including the axis O M is there. This figure also shows the state of the vibration isolator 20 in a state in which the elastic member 13 is omitted, and the same parts as those described above are denoted by the same reference numerals and description thereof is omitted.

本形態では、円周方向延在部21p,22pの外周縁(先端)e21,e22を、円周方向θに沿って形成された凹凸形状としている。この場合、内筒11と弾性部材13との相互間に作用する応力(特に、円周方向θに対するせん断力)σや、外筒12と弾性部材13との相互間に作用する応力(特に、円周方向θに対するせん断力)σを有効に受けることができるので、より強固な接合を確保することができる。   In this embodiment, the outer peripheral edges (tips) e21 and e22 of the circumferentially extending portions 21p and 22p are formed in an uneven shape formed along the circumferential direction θ. In this case, the stress acting between the inner cylinder 11 and the elastic member 13 (particularly the shearing force in the circumferential direction θ) σ, and the stress acting between the outer cylinder 12 and the elastic member 13 (particularly, Since the shearing force (sigma) with respect to the circumferential direction θ can be effectively received, stronger bonding can be ensured.

また、本形態では、円周方向延在部21p,22pに、軸線OM方向に貫通する貫通孔21a,22aを形成している。かかる構成によれば、円周方向延在部21p,22pの外周縁e21,e22を、円周方向θに沿って凹凸形状に形成した場合と同様の作用効果を奏する。 Further, in this embodiment, the circumferential extending portion 21p, the 22p, a through hole 21a that penetrates in the axial O M direction to form the 22a. According to such a configuration, the same operational effects as when the outer peripheral edges e21 and e22 of the circumferentially extending portions 21p and 22p are formed in an uneven shape along the circumferential direction θ are exhibited.

ところで、内筒11と外筒12にそれぞれ、円周方向延在部21p,22pをオーバーラップさせて設けるにあたり、円周方向延在部21p、22pの少なくとも一方が軸線方向に複数存在す場合、内筒11をこれと別体である外筒12に同軸配置することは困難である。   By the way, when providing the inner cylinder 11 and the outer cylinder 12 with the circumferentially extending portions 21p and 22p overlapping, at least one of the circumferentially extending portions 21p and 22p exists in the axial direction. It is difficult to arrange the inner cylinder 11 coaxially with the outer cylinder 12, which is a separate body.

また、内筒11と外筒12とを例えば樹脂射出成形用金型にて成形する場合、これに用いる金型はスライドコアを利用した複雑な金型を必要とするが、こうしたスライドコアを用いないことが金型上、成形上及びコスト上は好ましい。加えて、内筒11や外筒12の形状如何では製造が困難な場合もあり得る。   In addition, when the inner cylinder 11 and the outer cylinder 12 are molded using, for example, a resin injection mold, the mold used for this requires a complicated mold using a slide core. It is preferable that it is not present on the mold, molding and cost. In addition, the manufacturing may be difficult depending on the shape of the inner cylinder 11 and the outer cylinder 12.

図12は、図10に示す防振具の変形例であって、本発明の第八の形態としての防振具20を、モータ取付側から示す正面図であり、また、図13は、同形態を、モータ取付側から軸線OMを含む断面にて示す斜視断面図である。なお、同図も、防振具20を、弾性部材13を省略した状態で示し、また、先に説明した部分と同一の部分は、同一符号をもって、その説明を省略する。 FIG. 12 is a modified example of the vibration isolator shown in FIG. 10, and is a front view showing the vibration isolator 20 as the eighth embodiment of the present invention from the motor mounting side, and FIG. the form is a perspective cross-sectional view illustrating the motor mount side in cross-section including the axis O M. In this figure, the vibration isolator 20 is shown with the elastic member 13 omitted, and the same parts as those described above are denoted by the same reference numerals, and the description thereof is omitted.

本形態において、内筒11の外周面11fには、円周方向θの全周に亘って環状のフランジ部21fが一体に成形されており、このフランジ部21fを介して、4つの円周方向延在部21pが、軸線OMを中心に円周方向θに沿って90度の間隔で断続的に一体に形成されている。 In this embodiment, an annular flange portion 21f is integrally formed on the outer peripheral surface 11f of the inner cylinder 11 over the entire circumference in the circumferential direction θ, and four circumferential directions are formed via the flange portion 21f. extending portion 21p is formed intermittently integrally about the axis O M at 90 degree intervals in the circumferential direction theta.

これに対し、外筒12の円周方向延在部22pは、外筒12の内周面12fに一体に形成されている。更に、円周方向延在部22pは、図13に示すように、軸線OMに沿って間隔を空けて、風上側の円周方向延在部22p1と、風下側の円周方向延在部22p2との二列に構成されている。また、円周方向延在部22p1及び円周方向延在部22p2もそれぞれ、円周方向θに沿って4つずつ90度の間隔で断続的に形成され、且つ、22p1、22p2は円周方向に相対的に45度ずらして配置されている。 On the other hand, the circumferentially extending portion 22p of the outer cylinder 12 is formed integrally with the inner peripheral surface 12f of the outer cylinder 12. Furthermore, the circumferential extending portion 22p, as shown in FIG. 13, at intervals along the axis O M, the circumferential extending portion 22p1 windward, leeward circumferentially extending portion It is configured in two rows with 22p2. Further, the circumferentially extending portion 22p1 and the circumferentially extending portion 22p2 are each formed intermittently at intervals of 90 degrees along the circumferential direction θ, and 22p1 and 22p2 are circumferentially oriented. Are shifted by 45 degrees relative to each other.

こうすることで形成される外筒12は、半径方向内側に向かう円周方向延在部22pが軸線OM方向に複数存在しても、樹脂射出成形用の金型の開閉方向でアンダーカットが生ずることがなく、よって、スライドコアを必要としない金型で成形することが可能となる。 Outer cylinder 12 formed in this way can be circumferentially extending portion 22p toward the radially inner side there are a plurality in the axial O M direction, it undercuts in the opening-closing direction of the mold for resin injection molding Therefore, it is possible to mold with a mold that does not require a slide core.

また、内筒側円周方向延在部21pと、外筒側円周方向延在部22p1及び22p2とを互いに干渉しないように円周θ方向の一方にずらした状態で軸線OMに沿って挿入し、そのまま円周θ方向に回転させれば、図12等に示すように、内筒11の円周方向突出部21pと外筒12の円周方向突出部22p1及び22p2とを容易に位置決めすることができ、しかも、内筒側円周方向延在部21p及び外筒側円周方向延在部22p1と、内筒側円周方向延在部21p及び外筒側円周方向延在部22p2とをそれぞれ、同図に示すように、軸線OM方向から見て干渉する位置関係に配置することができる。 Further, the inner cylinder side circumference extending portion 21p, and a state in which shifted and the outer cylinder side circumference extending portion 22p1 and 22p2 on one circumferential θ direction so as not to interfere with each other along the axis O M If it is inserted and rotated in the circumferential θ direction as it is, as shown in FIG. 12 and the like, the circumferential projection 21p of the inner cylinder 11 and the circumferential projections 22p1 and 22p2 of the outer cylinder 12 are easily positioned. In addition, the inner cylinder side circumferential extension part 21p and the outer cylinder side circumferential extension part 22p1, and the inner cylinder side circumferential extension part 21p and the outer cylinder side circumferential extension part respectively and 22P2, as shown in the figure, it may be placed in a positional relationship interfere when viewed from the axial O M direction.

図14は、図1等に記載の第一の形態に係る構成と図10に記載の第六の形態に係る構成とを組み合わせた防振具であって、本発明の第九の形態としての防振具30を、外筒12を透視した状態でモータ取付側から示す斜視図である。また、図15は、同形態を、軸線OMを含む断面にて示す側面図である。なお、各図も、防振具20を、弾性部材13を省略した状態で示し、また、先に説明した部分と同一の部分は、同一符号をもって、その説明を省略する。 FIG. 14 is a vibration isolator that combines the configuration according to the first embodiment shown in FIG. 1 and the like and the configuration according to the sixth embodiment shown in FIG. 10, and as a ninth embodiment of the present invention, 3 is a perspective view showing the vibration isolator 30 from the motor mounting side in a state where the outer cylinder 12 is seen through. FIG. Further, FIG. 15, the same form is a side view showing in cross-section including the axis O M. Each figure also shows the vibration isolator 20 in a state where the elastic member 13 is omitted, and the same parts as those described above are denoted by the same reference numerals, and the description thereof is omitted.

本形態では、内筒11と外筒12とにそれぞれ、円周方向θに互い違いに複数の軸線方向延在部11p,12pを設け、内筒側先端径Dと、外筒側先端径dとをD>dに設定することで、両先端e11,e12をそれぞれ、半径方向にオーバーラップさせると共に、
内筒11と外筒12とにそれぞれ、軸線OM方向に沿って互い違いに円周方向延在部21p,22pを設け、内筒側先端径Dと、外筒側先端径dとをD>dに設定することで、両先端e21,e22をそれぞれ、軸線OM方向から見てオーバーラップさせることにより、
内筒11と外筒12との間に、軸線OM方向及び円周方向θに沿って複数の半閉鎖領域AX及びAYを有する連続空間R3を設け、この連続空間R3に弾性部材13を設けている。
In this embodiment, each of the inner cylinder 11 and the outer cylinder 12 is provided with a plurality of axially extending portions 11p, 12p alternately in the circumferential direction θ, and the inner cylinder side tip diameter D, the outer cylinder side tip diameter d, By setting D> d, both ends e11 and e12 are overlapped in the radial direction,
The inner cylinder 11 and the outer cylinder 12 and, respectively, staggered circumferentially extending portion 21p along the axis O M direction, the provided 22p, an inner cylinder-side tip diameter D, and an outer cylinder-side tip diameter d D> by setting the d, respectively both ends e21, e22, and by overlapping as viewed from the axial O M direction,
Between the inner cylinder 11 and the outer cylinder 12 along the axial line O M and circumferential directions θ a continuous space R3 provided with a plurality of semi-closed area A X and A Y, the elastic member 13 in the continuous space R3 Is provided.

本形態によれば、円周方向θ及び軸線OM方向の両方向に対する防振性能と耐久性能との向上が図れるため、防振性能と耐久性能とのより一層の向上を更なるコストの増大を招くことなく実現することができる。 According to this embodiment, since it is possible to improve the anti-vibration performance and durability for both the circumferential direction θ and axial O M direction, the further increase in cost to further improve the vibration damping performance and durability It can be realized without inviting.

図16は、第九の形態の変形例であって、本発明の第十の形態としての防振具30を、風下側から示す正面図であり、また、図17は、同形態を、風下側から示す斜視図である。なお、図16.17は、弾性部材13を省略した状態で示し、また、先に説明した部分と同一の部分は、同一符号をもって、その説明を省略する。   FIG. 16 is a modified example of the ninth embodiment, and is a front view showing the vibration isolator 30 as the tenth embodiment of the present invention from the leeward side, and FIG. It is a perspective view shown from the side. 16.17 shows the state in which the elastic member 13 is omitted, and the same parts as those described above are denoted by the same reference numerals, and the description thereof is omitted.

内筒31は、その外周面fに、円周方向θに全周に亘って円周方向延在部31fが一体に形成されている。   A circumferentially extending portion 31f is integrally formed on the outer peripheral surface f of the inner cylinder 31 over the entire circumference in the circumferential direction θ.

円周方向延在部31fの外周縁efは、図16に示すように、円周方向θに沿って形成された凹凸形状をし、このうち、凸形状部分にそれぞれ、内筒31の外周面fに設けられた軸線方向延在部31pが一体に繋がる。即ち、円周方向延在部31fには、円周方向θに間隔を空けて、軸線OMに沿って延在する8つの軸線方向延在部31pが一体に形成されている(図では符号31pを例示的に1箇所のみ付記)。 As shown in FIG. 16, the outer peripheral edge ef of the circumferentially extending portion 31 f has an uneven shape formed along the circumferential direction θ, and among these, the convex portion has an outer peripheral surface of the inner cylinder 31. An axially extending portion 31p provided in f is integrally connected. That is, the circumferential direction extending portion 31f, at intervals in the circumferential direction theta, eight axially extending portion 31p that extends along the axis O M is (Fig formed integrally code 31p is exemplarily added only in one place).

また、外筒12の内周面12fには、モータ取付側に、円周方向θに沿って全周に亘って環状の円周方向延在部22fが一体に形成されていると共に、軸線方向延在部12pが一体に形成されている。   Further, on the inner peripheral surface 12f of the outer cylinder 12, an annular circumferentially extending portion 22f is integrally formed over the entire circumference along the circumferential direction θ on the motor mounting side, and the axial direction The extending part 12p is integrally formed.

本形態は、軸線方向延在部31p,12pの先端e31,e12を円周方向θに沿ってオーバーラップさせると共に、円周方向延在部22f,31fの先端e22,efを半径方向にオーバーラップさせることで、内筒11と外筒12との間に、軸線OM方向及び円周方向θに沿って複数の半閉鎖領域を有する連続空間R3を設けているが、円周方向延在部31fの外周縁efのうち、その凹形状部分が、図16に示すように、円周方向延在部22fの先端部e22とオーバーラップしない構成となっている。 In this embodiment, the tips e31, e12 of the axially extending portions 31p, 12p overlap along the circumferential direction θ, and the tips e22, ef of the circumferentially extending portions 22f, 31f overlap in the radial direction. It is to, between the inner cylinder 11 and the outer cylinder 12 along the axial line O M and circumferential directions θ is provided a continuous space R3 having a plurality of semi-closed area, but circumferentially extending portion Of the outer peripheral edge ef of 31f, as shown in FIG. 16, the concave part is configured not to overlap the tip end part e22 of the circumferentially extending part 22f.

本発明に係る防振具を用いれば、当該防振具と送風用ファンとを有する送風用ファン構造体として一体に成形した場合、振動や騒音の発生が更に抑制された安価な送風用ファン構造体を提供することができる。   If the vibration isolator according to the present invention is used, an inexpensive blower fan structure in which generation of vibration and noise is further suppressed when integrally formed as a blower fan structure having the vibration isolator and the blower fan. The body can be provided.

本発明に係る防振具は、プロペラファンに代表される軸流ファンやターボファン、シロッコファンに代表される遠心ファン、斜流ファンや横流ファン(クロスフローファン)等、その用途に応じた様々な送風用ファンに採用することができる。   The vibration isolator according to the present invention includes various types of axial flow fans and turbo fans typified by propeller fans, centrifugal fans typified by sirocco fans, mixed flow fans and cross-flow fans (cross-flow fans). It can be used as a fan for air blowing.

上述したところは、本発明の好適な形態であるが、当業者によれば、特許請求の範囲内で種々の変更を加えることができる。例えば、本発明によれば、上述した各形態の部材やその形態、又は、その周辺構造等は用途に応じてそれぞれ組み合わせて使用することができる。   The above is the preferred embodiment of the present invention, but various modifications can be made within the scope of the claims by those skilled in the art. For example, according to the present invention, the above-described members of the respective forms, the forms thereof, or the peripheral structures thereof can be used in combination depending on the application.

(a),(b)はそれぞれ、本発明の一形態である送風用ファン構造体を示す斜視図及び、これにモータを取り付けた状態を図1のX−X断面で模式的に示す要部断面図である。(a), (b) is the perspective view which shows the fan structure for ventilation which is one form of this invention, respectively, and the principal part which shows the state which attached the motor to this in the XX cross section of FIG. It is sectional drawing. 同形態に採用した防振具を風上側(モータ取付側)から示す斜視図である。It is a perspective view which shows the vibration isolator employ | adopted for the form from the windward side (motor attachment side). 同形態の防振具を、弾性部材を省略した状態で風下側(モータ取付側と対向する側)から示す斜視図である。It is a perspective view which shows the vibration isolator of the same form from the leeward side (side facing a motor attachment side) in the state which abbreviate | omitted the elastic member. 同形態の防振具を、その弾性部材内で円周方向に加わる応力と共に示す斜視図である。It is a perspective view which shows the vibration isolator of the same form with the stress added to the circumferential direction within the elastic member. 同形態の防振具を、その弾性部材内で自重方向に加わる応力と共に示す斜視図である。It is a perspective view which shows the vibration isolator of the same form with the stress added to the own weight direction within the elastic member. 本発明の第二の形態としての防振具を、モータ取付側から示す斜視図である。It is a perspective view which shows the vibration isolator as a 2nd form of this invention from the motor attachment side. 本発明の第三の形態としての防振具を、モータ取付側から示す斜視図である。It is a perspective view which shows the vibration isolator as a 3rd form of this invention from the motor attachment side. 本発明の第四の形態である送風用ファンの防振具を、モータ取付側から軸線OMを含む断面にて弾性部材を省略した状態で示す斜視断面図である。The fourth explosion puffer blowing fan is in the form of the present invention, it is a perspective cross-sectional view showing in cross-section including the axis O M from the motor mounting side while omitting the elastic member. 本発明の第五の形態としての防振具を、モータ取付側から軸線OMを含む断面にて弾性部材を省略した状態で示す斜視断面図である。The proof Blowfish a fifth embodiment of the present invention, is a perspective cross-sectional view showing in cross-section including the axis O M from the motor mounting side while omitting the elastic member. 本発明の第六の形態としての防振具を、モータ取付側から軸線OMを含む断面にて弾性部材を省略した状態で示す斜視断面図である。The proof Blowfish a sixth embodiment of the present invention, is a perspective cross-sectional view showing in cross-section including the axis O M from the motor mounting side while omitting the elastic member. 本発明の第七の形態としての防振具を、モータ取付側から軸線OMを含む断面にて弾性部材を省略した状態で示す斜視断面図である。The proof Blowfish as the seventh embodiment of the present invention, is a perspective cross-sectional view showing in cross-section including the axis O M from the motor mounting side while omitting the elastic member. 本発明の第八の形態としての防振具を、モータ取付側から示す正面図である。It is a front view which shows the vibration isolator as an 8th form of this invention from the motor attachment side. 同形態を、モータ取付側から軸線OMを含む断面にて弾性部材を省略した状態で示す斜視断面図である。The same form is a perspective cross-sectional view showing in cross-section including the axis O M from the motor mounting side while omitting the elastic member. 本発明の第九の形態としての防振具を、外筒を透視した状態でモータ取付側から示す斜視図である。It is a perspective view which shows the vibration isolator as a 9th form of this invention from the motor attachment side in the state which looked through the outer cylinder. 同形態を、軸線OMを含む断面にて弾性部材を省略した状態で示す断面図である。The same form is a sectional view showing a state in which omitted elastic member in cross-section including the axis O M. 本発明の第十の形態としての防振具を、モータ取付側と対向する風下側から示す正面図である。It is a front view which shows the vibration isolator as a 10th form of this invention from the leeward side facing a motor attachment side. 同形態を、モータ取付側と対向する風下側から弾性部材を省略した状態で示す斜視図である。It is a perspective view which shows the form in the state which abbreviate | omitted the elastic member from the leeward side facing a motor attachment side.

符号の説明Explanation of symbols

1 送風用ファン構造体
10 防振具(本発明防振具)
11 内筒
11a 保持面
11b フランジ部
11f 外周面
11p 軸線方向延在部
12 外筒
12f 内周面
12p 軸線方向延在部
21a 貫通孔(内筒)
21p 円周方向延在部(内筒)
22a 貫通孔(内筒)
22f 円周方向延在部(外筒)
22p 円周方向延在部(外筒)
31f 円周方向延在部(内筒)
31p 軸線方向延在部(内筒)
m 開放領域
X 円周方向半閉鎖領域
Y 軸線方向半閉鎖領域
e11 内筒側軸線方向延在部の先端(外周縁)
e12 外筒側軸線方向延在部の先端(外周縁)
e21 内筒側円周方向延在部の先端(外周縁)
e22 外筒側円周方向延在部の先端(外周縁)
e31 内筒側軸線方向延在部の先端(外周縁)
ef 内筒側円周方向延在部の先端(外周縁)
1 Fan structure
10 Anti-vibration device (Invention anti-vibration device)
11 Inner cylinder
11a Holding surface
11b Flange
11f Outer surface
11p Axial extension
12 outer cylinder
12f Inner peripheral surface
12p Axial extension
21a Through hole (inner cylinder)
21p Circumferential extension (inner cylinder)
22a Through hole (inner cylinder)
22f Circumferential extension (outer cylinder)
22p Circumferential extension (outer cylinder)
31f Circumferential extension (inner cylinder)
31p Axial extension (inner cylinder)
Am open area A X circumferential direction semi-closed area A Y axis direction semi-closed area
e11 Tip of outer cylinder side axial extension (outer rim)
e12 Tip of outer cylinder side axial extension (outer rim)
e21 Tip of the inner cylinder side circumferential extension (outer rim)
e22 Tip of outer cylinder side circumferential extension (outer rim)
e31 Tip of outer cylinder side axial extension (outer rim)
ef Tip of the inner cylinder side circumferential extension (outer rim)

Claims (10)

回転軸に固定される内筒と、送風用ファンを保持する外筒と、内筒及び外筒を一体に連結する弾性部材とを有する送風用ファンの防振具であって、
内筒の外周面に、この内筒から半径方向外側に向かって突出する軸線方向延在部を円周方向に間隔を空けて設ける一方、
外筒の内周面に、この外筒から半径方向内側に向かって突出する軸線方向延在部を円周方向に間隔を空けて設け、
内筒側の軸線方向延在部の先端に接する接円の直径Dと、外筒側の軸線方向延在部の先端に接する接円の直径dとをD≧dに設定すると共に、
内筒と外筒とを、これらの軸線方向延在部が互い違いになるように配置して、
内筒と外筒との間に、円周方向に沿って複数の半閉鎖領域を有する連続空間を形成し、
この連続空間に、円周方向の応力が発生するとき、この応力が前記軸線方向延在部によって抑制されるように、当該弾性部材を設けたことを特徴とする送風用ファンの防振具。
A blower fan vibration isolator having an inner cylinder fixed to a rotating shaft, an outer cylinder holding a fan for blowing, and an elastic member integrally connecting the inner cylinder and the outer cylinder,
On the outer peripheral surface of the inner cylinder, an axially extending portion that protrudes radially outward from the inner cylinder is provided with an interval in the circumferential direction,
On the inner peripheral surface of the outer cylinder, an axially extending portion that protrudes radially inward from the outer cylinder is provided with an interval in the circumferential direction.
The diameter D of the contact circle in contact with the tip of the axial extension portion on the inner cylinder side and the diameter d of the contact circle in contact with the tip of the axial extension portion on the outer cylinder side are set to D ≧ d.
Arranging the inner cylinder and the outer cylinder so that these axially extending portions are staggered,
A continuous space having a plurality of semi-closed regions along the circumferential direction is formed between the inner cylinder and the outer cylinder,
An antivibration device for a blower fan, wherein the elastic member is provided so that, when a circumferential stress is generated in the continuous space, the stress is suppressed by the axially extending portion.
回転軸に固定される内筒と、送風用ファンを保持する外筒と、内筒及び外筒を一体に連結する弾性部材とを有する送風用ファンの防振具であって、
内筒の外周面に、この内筒から半径方向外側に向かって突出する円周方向延在部を設け、若しくは、
外筒の内周面に、この外筒から半径方向内側に向かって突出する円周方向延在部を設け、又は、
内筒の外周面と外筒の内周面との両方に、前記円周方向延在部を設け、
内筒と外筒との間に、軸線方向に沿って少なくとも1つの半閉鎖領域を有する連続空間を形成し、
この連続空間に、軸線方向の応力が発生するとき、この応力が前記円周方向延在部によって抑制されるように、当該弾性部材を設けたことを特徴とする送風用ファンの防振具。
A blower fan vibration isolator having an inner cylinder fixed to a rotating shaft, an outer cylinder holding a fan for blowing, and an elastic member integrally connecting the inner cylinder and the outer cylinder,
A circumferentially extending portion that protrudes radially outward from the inner cylinder is provided on the outer peripheral surface of the inner cylinder, or
A circumferentially extending portion that protrudes radially inward from the outer cylinder is provided on the inner peripheral surface of the outer cylinder, or
The circumferentially extending portion is provided on both the outer peripheral surface of the inner cylinder and the inner peripheral surface of the outer cylinder,
A continuous space having at least one semi-closed region along the axial direction is formed between the inner cylinder and the outer cylinder,
An antivibration device for a blower fan, characterized in that the elastic member is provided so that, when an axial stress is generated in the continuous space, the stress is suppressed by the circumferentially extending portion.
回転軸に固定される内筒と、送風用ファンを保持する外筒と、内筒及び外筒を一体に連結する弾性部材とを有する送風用ファンの防振具であって、
内筒の外周面に、この内筒から半径方向外側に向かって突出する軸線方向延在部を円周方向に間隔を空けて設ける一方、
外筒の内周面に、この外筒から半径方向内側に向かって突出する軸線方向延在部を円周方向に間隔を空けて設け、
内筒側の軸線方向延在部の先端に接する接円の直径Dと、外筒側の軸線方向延在部の先端に接する接円の直径dとをD≧dに設定すると共に、
内筒の外周面に、この内筒から半径方向外側に向かって突出する円周方向延在部を設け、若しくは、
外筒の内周面に、この外筒から半径方向内側に向かって突出する円周方向延在部を設け、又は、
内筒の外周面と外筒の内周面との両方に、前記円周方向延在部を設け、
内筒と外筒とを、少なくとも、軸線方向延在部が互い違いになるように配置して、
内筒と外筒との間に、円周方向に沿って複数の半閉鎖領域を有すると共に、軸線方向に沿って少なくとも1つの半閉鎖領域を有する連続空間を形成し、
この連続空間に、円周方向の応力が発生するとき、この応力が前記軸線方向延在部によって抑制されると共に、軸線方向の応力が発生するとき、この応力が前記円周方向延在部によって抑制されるように、当該弾性部材を設けたことを特徴とする送風用ファンの防振具。
A blower fan vibration isolator having an inner cylinder fixed to a rotating shaft, an outer cylinder holding a fan for blowing, and an elastic member integrally connecting the inner cylinder and the outer cylinder,
On the outer peripheral surface of the inner cylinder, an axially extending portion that protrudes radially outward from the inner cylinder is provided with an interval in the circumferential direction,
On the inner peripheral surface of the outer cylinder, an axially extending portion that protrudes radially inward from the outer cylinder is provided with an interval in the circumferential direction.
The diameter D of the contact circle in contact with the tip of the axial extension portion on the inner cylinder side and the diameter d of the contact circle in contact with the tip of the axial extension portion on the outer cylinder side are set to D ≧ d.
A circumferentially extending portion that protrudes radially outward from the inner cylinder is provided on the outer peripheral surface of the inner cylinder, or
A circumferentially extending portion that protrudes radially inward from the outer cylinder is provided on the inner peripheral surface of the outer cylinder, or
The circumferentially extending portion is provided on both the outer peripheral surface of the inner cylinder and the inner peripheral surface of the outer cylinder,
Arranging the inner cylinder and the outer cylinder at least so that the axially extending portions are staggered,
A continuous space having a plurality of semi-closed regions along the circumferential direction and at least one semi-closed region along the axial direction is formed between the inner tube and the outer tube,
When a circumferential stress is generated in the continuous space, the stress is suppressed by the axial extension portion, and when an axial stress is generated, the stress is suppressed by the circumferential extension portion. An anti-vibration device for a blower fan, wherein the elastic member is provided so as to be suppressed.
請求項1又は3において、外筒の軸線方向延在部は、当該外筒の内周面と共にその外周面を半径方向内側に突出させて形成したものであることを特徴とする送風用ファンの防振具。   4. The fan according to claim 1, wherein the axially extending portion of the outer cylinder is formed by projecting the outer peripheral surface of the outer cylinder inward in the radial direction together with the inner peripheral surface of the outer cylinder. Vibration isolator. 請求項2乃至4のいずれか一項において、前記円周方向延在部を、内筒の外周面と、外筒の内周面との両方に、回転軸に沿って間隔を空けて設け、
内筒側の円周方向延在部の先端に接する接円の直径Dと、外筒側の円周方向延在部の先端に接する接円の直径dとをD≧dに設定すると共に、
内筒と外筒とを、これらの円周方向延在部が互い違いになるように配置したことを特徴とする送風用ファンの防振具。
In any one of Claims 2 thru / or 4, The above-mentioned peripheral direction extension part is provided in both the outer peripheral surface of an inner cylinder, and the inner peripheral surface of an outer cylinder at intervals along a rotation axis,
The diameter D of the contact circle in contact with the tip of the circumferential extension portion on the inner cylinder side and the diameter d of the contact circle in contact with the tip of the circumferential extension portion on the outer cylinder side are set to D ≧ d.
An antivibration device for a blower fan, wherein an inner cylinder and an outer cylinder are arranged so that their circumferentially extending portions are staggered.
請求項2乃至5のいずれか一項において、内筒側の円周方向延在部と外筒側の円周方向延在部とのうちの少なくとも一方は、円周方向の全周に亘って形成された環状部であることを特徴とする送風用ファンの防振具。   In any one of Claims 2 thru | or 5, at least one of the circumferential direction extension part by the side of an inner cylinder and the circumferential direction extension part by the side of an outer cylinder extends over the perimeter of a circumferential direction. A vibration isolator for a fan for air blowing, wherein the vibration isolator is an annular portion formed. 請求項2乃至5のいずれか一項において、内筒側の円周方向延在部と外筒側の円周方向延在部とのうちの少なくとも一方は、円周方向に沿って断続的に形成されたものであることを特徴とする送風用ファンの防振具。   In any one of Claims 2 thru | or 5, at least one of the circumferential direction extension part by the side of an inner cylinder and the circumferential direction extension part by the side of an outer cylinder is intermittently along the circumferential direction. An anti-vibration device for a blower fan, characterized by being formed. 請求項2乃至7のいずれか一項において、内筒側の円周方向延在部と外筒側の円周方向延在部とのうちの少なくとも一方は、その外周縁が、円周方向に沿って形成された凹凸形状であることを特徴とする送風用ファンの防振具。   In any one of Claims 2 thru | or 7, as for at least one of the circumferential direction extension part by the side of an inner cylinder, and the circumferential direction extension part by the side of an outer cylinder, the outer periphery is a circumferential direction. An anti-vibration device for a blower fan, wherein the anti-vibration device has an uneven shape formed along the fan. 請求項2乃至8のいずれか一項において、内筒側の円周方向延在部と外筒側の円周方向延在部とのうちの少なくとも一方に、軸線方向に貫通する貫通孔を形成したことを特徴とする送風用ファンの防振具。   9. The through-hole penetrating in the axial direction is formed in at least one of the circumferentially extending portion on the inner cylinder side and the circumferentially extending portion on the outer cylinder side according to claim 2. An anti-vibration device for a blower fan, characterized by 請求項1乃至9のいずれか一項に記載の防振具と、この防振具の外筒に結合する送風用ファンとを備えることを特徴とする送風用ファン構造体。   A blower fan structure comprising: the vibration isolator according to any one of claims 1 to 9; and a blower fan coupled to an outer cylinder of the vibration isolator.
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