JP4080727B2

JP4080727B2 - Viscous fluid filled damper

Info

Publication number: JP4080727B2
Application number: JP2001346061A
Authority: JP
Inventors: 理恵都澤
Original assignee: Polymatech Co Ltd
Current assignee: Polymatech Co Ltd
Priority date: 2001-11-12
Filing date: 2001-11-12
Publication date: 2008-04-23
Anticipated expiration: 2021-11-12
Also published as: JP2003148541A

Description

【０００１】
【発明の属する技術分野】
本発明はダンパーに関し、特にＣＤやＤＶＤなどのディスク状記録媒体から非接触読取り方式で記録データの読出しを行う音響機器や情報機器等の振動減衰に好適なダンパーに関する。
【０００２】
【従来の技術】
図１４は、車載用ＣＤプレーヤ１の防振構造を示す図で、その筐体２の内部には音楽用ＣＤを再生するプレーヤ本体３（被支持体）がコイルスプリング４にて支持されている。筐体２に固定してある５はダンパーで、プレーヤ本体３の底面部から突設した樹脂や金属等の硬質材で形成した軸体６を保持しており、プレーヤ本体３に作用する振動を減衰させるものである。
【０００３】
即ち、図１５で示すように、ダンパー５は、例えばポリプロピレン等の硬質樹脂で形成した周壁部７を備えており、その上側開口端はスチレン系熱可塑性エラストマー等のゴム状弾性体で形成した可撓部８にて密封されている。その下側開口端は、周壁部７と同材質の蓋９にて密封されており、密封された内部空間には、シリコーンオイル等でなる粘性流体１０が充填されている。なお、周壁部７、可撓部８、蓋９及び後述の軸体取付部１１によって密封状の容器本体５ａが構成される。
【０００４】
軸体取付部１１は、円筒状の周壁部１１ａと、外径が周壁部１１ａと同寸で該周壁部１１ａの下側開口端を閉塞する底部１１ｂを一体形成した有底筒状として形成されており、プレーヤ本体３に作用する振動は、軸体６を保持するこの軸体取付部１１を通じてダンパー５へ入力されて、可撓部８の弾性変形と、粘性流体１０の流動による粘性抵抗とによって減衰される。
【０００５】
【発明が解決しようとする課題】
ところで、このような従来のダンパー５にあっては、プレーヤ本体３に共振周波数付近（特に１０〜３０Ｈｚの低い周波数付近）の振動入力がなされ、また悪路走行時等にプレーヤ本体３に高加速度の衝撃が加わると、プレーヤ本体３が大きく上下方向（図１６（ａ））や左右方向（図１６（ｂ））に振幅して、ゴム状弾性体製の軸体取付部１１が硬質樹脂製の周壁部７や同じく硬質樹脂製の蓋９に対して衝突し、軸体取付部１１の底部１１ｂが圧縮応力の集中によって破断することがある。そして、破断してしまうと、密封した粘性流体１０が破断箇所Ｂｐから漏出するため本来の減衰効果を発揮できなくなるだけでなく、漏れた粘性流体１０により機器内部を汚してしまうことがある。
【０００６】
こうした問題は、粘性流体１０の流動による粘性抵抗を利用するダンパー５に限られるものではなく、粘性流体１０に代えて空気の流入・流出による粘性抵抗を振動減衰に利用するエアーダンパーと称されるダンパーであっても、破断部分からの空気漏れによって本来の減衰効果を発揮できなくなる点で、同様の問題を抱えている。
【０００７】
以上のような従来技術を背景になされたのが本発明であって、その目的は、振動により被支持体が大きく振幅することで被支持体の軸体を保持する軸体取付部がダンパーの内側面と衝突しても、軸体取付部が破断し難いダンパーを提供することにある。
【０００８】
【課題を解決するための手段】
即ち本発明は、振動伝達路の一次側又は二次側に位置する被支持体を、この被支持体から突出する軸体の挿入を受けて保持する周壁部と底部とからなる有底筒状の軸体取付部を有し、この軸体取付部を軸体挿入開口側にて被支持体に対し追従変位可能として浮動支持する可撓部を備えるダンパーについて、軸体取付部の底部における、該軸体取付部の軸心線上を除く外側位置に、緩衝用凸部を形成したことを特徴とする。
【０００９】
この発明によるダンパーは、軸体取付部の底部（底部分）における、軸体取付部の軸心線上の外側位置に緩衝用凸部を形成したので、軸体取付部がその軸心方向へ変位しても、軸体からの力が直接作用する軸体取付部底部における軸心線上の部分がダンパーの内側面（例えば硬質樹脂製の蓋）に対して強く衝突しない。つまり、その軸心線上の外側位置に形成した緩衝用凸部が先ずダンパーの内側面と衝突し、その衝撃力は肉厚で変形し易い緩衝用凸部の圧縮変形によって吸収されるので、軸体取付部底部への応力集中を分散して破断し難くすることができる。また、軸体取付部が軸交差方向（軸直方向を含む交差方向）へ変位しても、ダンパーの内側面（例えば硬質樹脂製の周壁部）に対して強く衝突しない。つまり、このダンパーの軸体取付部では、軸体の底部に緩衝用凸部を形成してあるので、まず該底部に形成した緩衝用凸部がダンパーの内側面と衝突し、その衝撃力は変形し易い緩衝用凸部の圧縮変形によって吸収されて、軸体取付部底部への応力集中を分散して破断し難くすることができる。
【００１０】
このような作用を発揮する緩衝用凸部は、特に軸体取付部の軸心線方向で大きな変位が想定されるダンパーについては、軸体取付部の底部における外底面に形成するとよく、軸体取付部の軸交差方向で大きな変位が想定されるダンパーについては、軸体取付部の底部における外周面に形成するのがよい。また、例えば車両走行時の振動を減衰する場合のように全方向への変位が想定される場合には、該底部における外底面と外周面の両方に形成するのが効果的である。
【００１１】
そして、以上のうち軸体取付部の底部における外底面に緩衝用凸部を形成するダンパーについては、特に軸体の軸心方向投影領域の外側位置に形成するのが好ましい。即ち、この緩衝用凸部は軸体の軸心方向投影領域と重ならないため、軸体取付部が軸心線方向に変位してダンパーの内側面（例えば硬質樹脂製の蓋）と衝突した場合に、軸体の軸心方向に伝達する力が直線的且つ直接的に緩衝用凸部に伝わらず、該投影領域の外側位置へ迂回的に伝達させることができるので緩衝用凸部への応力分散効果が更に高められる。
【００１２】
また、軸体取付部の底部における外底面に緩衝用凸部を形成したダンパーについては、緩衝用凸部を、軸体取付部の周壁部の外周面よりも更に径方向外向きに延長するように突出させて形成したものとしてもよい。このダンパーであれば、軸体取付部が軸交差方向に変位してダンパーの内側面（例えば硬質樹脂製の周壁部）と衝突しても、その衝撃力は緩衝用凸部の該突出させた部分によって吸収されるので、軸体取付部底部への応力集中が分散されて破断し難くなる。
【００１３】
ところで、緩衝用凸部を軸体取付部の底部における外周面上に形成する場合には軸体の軸直方向投影領域を除く外側位置に形成するのが好ましい。このようにすると軸体取付部が軸交差方向へ変位してダンパーの内側面（例えば硬質樹脂製の周壁部）と衝突しても、軸体の軸交差方向へ伝達する力が直線的且つ直接的に緩衝用凸部に伝わらず、該投影領域の外側位置へ迂回的に伝達させることができるので緩衝用凸部による応力分散効果が更に高められるためである。
【００１４】
以上のような緩衝用凸部によって軸体取付部を破断し難くすることは、ダンパーの内部に封入したシリコーンオイルのような液状の粘性流体の流動抵抗を振動減衰に利用する粘性流体封入式ダンパーだけでなく、空気の流入・流出による流動抵抗を振動減衰に利用するエアーダンパーについても共通の課題である。そして、粘性流体封入式ダンパーの具体的構成としては、硬質樹脂でなる周壁部と、この周壁部の一端開口を閉塞する蓋と、を備え、該周壁部の他端開口が前記軸体取付部を有する前記可撓部にて閉塞された容器本体を備え、この容器本体内に液状の粘性流体を封入したものとして構成することができる。そして、この場合に、周壁部の一端開口を閉塞する蓋は、その全体を硬質樹脂にて形成したものであっても、全体をゴム状弾性体のような軟質樹脂にて形成したもの、あるいは周壁部に対して固着する外側部分を硬質樹脂で、軸体取付部の底部と対向する内側部分を熱可塑性エラストマーにて形成したものであってもよい。一方、エアーダンパーの具体的構成としては、硬質樹脂でなる筒状の周壁部と、この周壁部の一端開口を閉塞する蓋と、を備え、該周壁部の他端開口が前記軸体取付部を有する前記可撓部にて閉塞された容器本体を備え、該周壁部に容器本体の内外を流通する通気孔を形成したものとして構成することができる。
【００１５】
【発明の実施の形態】
以下、本発明のダンパーについて、図面を参照しつつ説明する。なお、従来技術と同じ部分については同じ符号を付して重複説明を省略する。
【００１６】
第１実施形態〔図１〕：本発明の第１実施形態によるダンパー２１を図１に示すが、このダンパー２１は、軸体取付部２２の外側面に特徴がある。一方、軸体取付部２２の内側面は軸体２３の形状に相応した形状とするのであって、この内側面の形状は任意である。なお、軸体取付部２２以外のその他の構成は従来例のダンパー５（図１５参照）と同じである。
【００１７】
軸体取付部２２は被支持体（図１４参照）から突出する軸体２３を挿入して保持するものであり、周壁部２４と底部２５とからなる有底筒状の形状を呈するものである。この軸体取付部２２の周壁部２４と底部２５の境界は次のように区別される。即ち、この軸体取付部２２で保持する軸体２３は、図２（ａ）に示すようにａ−ａ’線を境に外径が長さ方向に沿って等径の軸部２６と、軸体取付部２２からの抜け防止に機能する頭部２７とに分かれるものとし、この軸体２３が、軸体取付部２２に挿入された際に軸体取付部２２における軸体２３の頭部２７を含めそれより先に該当する部分、即ち、ａ−ａ’線より底側（図中下側）を軸体取付部２２の底部２５とし、ａ−ａ’線より基端側（図中上側）を周壁部２４とする。なお、図２（ｂ）に示す軸体２８は、頭部を有しないため、軸体取付部２２ａにおける軸体２８の先端より先に該当する部分、即ち、ｂ−ｂ’線より底側（図中下側）を底部２５と規定する。
【００１８】
第１実施形態におけるダンパー２１は、軸体取付部２２の底部２５に形成された緩衝用凸部が、軸体取付部２２の底部２５における軸心線２０上を除く外側位置であると共に、軸体取付部２２の外底面２５ａに形成されていることに特徴がある。図１に示したこの緩衝用凸部２９では、さらに、図１，図３に示すように、軸体２３の軸心方向（Ｙ）投影領域Ａの直径よりも距離ｄ_１だけ外側で、軸体取付部２２の外径よりも距離ｄ_２だけ内側となる位置に設けられている。そして、この緩衝用凸部２９の部分だけ、軸体取付部２２の底部２５が肉厚となっている。
【００１９】
このように、軸体取付部２２の外底面２５ａに環状に緩衝用凸部２９が形成されているため、例えば、軸体２３の基端側に固定した防振対象物である例えば車載用ＣＤプレーヤのプレーヤ本体（図１４参照）が振動を強く受けて軸心方向（Ｙ）に沿う図中下向きに大きく振幅すると、ゴム状弾性体でなる軸体取付部２２が硬質樹脂材でなる蓋９に対して強く衝突するが（図１６（ａ）参照）、こうした衝突が起こっても軸体取付部２２の外底面２５ａに形成された緩衝用凸部２９が、最初に蓋９と衝突するため、この緩衝用凸部２９に衝突による圧縮応力が集中し、緩衝用凸部２９が弾性変形することにより衝撃力が弱められる。すなわち、軸体２３側からの力が直に加わる軸体取付部２２の底部２５における、軸体２３の軸心方向（Ｙ）投影領域Ａの部分は、蓋９と衝突しないか、衝突したとしても既に衝撃が弱められているため、かかる部分に加えられる圧縮応力は軽減される。
【００２０】
従って、この実施形態のダンパー２１では、特に、防振対象物が軸心方向（Ｙ）に沿って大きく振幅して軸体取付部２２が蓋９と強く衝突することがあっても、軸体取付部２２の底部２５が破断するのを防ぐことができ、破断による粘性流体１０の漏出を防止することができる。
【００２１】
以上のような第１実施形態のダンパー２１は、その軸体取付部２２を例えば図４〜図６の拡大断面で示す変形形態の軸体取付部３０，３１，３２としても良い。これらの軸体取付部３０，３１，３２は、各々異なった緩衝用凸部３３，３４，３５を有している。図４に示す緩衝用凸部３３は、凸部の幅ｄ_４が軸体取付部３０の周壁部２４の幅ｄ_３と等しい。また、図５に示す緩衝用凸部３４は、緩衝用凸部３４の内側が軸体３６の軸心方向（Ｙ）投影領域よりも距離ｄ_５だけ内側で、軸体取付部３１の外径よりも距離ｄ_６だけ内側となる位置に設けられている。また、図６に示す緩衝用凸部３５は、先端がドーム状に削られた円柱状の凸部であり、外底面２５ａ上に８本突出して形成されている。そして、図４〜図６に示したような形態であっても軸体取付部３０，３１，３２の底部２５の破断防止効果を発揮することができる。また、これらの変形形態についても軸体取付部３０，３１，３２を除く他の構成は、図１に示したダンパー２１と同じである。なお、図５に示す軸体取付部３１のように、緩衝用凸部３４が軸体３６の軸心方向投影領域を含む位置（内側位置）にまで設けられ、距離ｄ_５の長さが長くなるような場合には、緩衝用凸部の変形がしずらく、変形による応力緩和が抑えられる。それゆえ、図５に示した緩衝用凸部３４よりは、図４に示した緩衝用凸部３３の方が、凸部の変形が起きやすく好ましい。
【００２２】
第２実施形態〔図７〕：本形態のダンパー（図示せず）における軸体取付部４１を図７に示す。この軸体取付部４１は、軸体取付部４１の外底面２５ａに形成された緩衝用凸部４２が、さらに軸体取付部４１の外周面２４ａよりも径方向外向きに突出していることに特徴がある。この形態の軸体取付部４１は、成形後に金型からの脱型が難しいが、次に第３実施形態で示す場合のように、軸体取付部４１が軸交差方向に沿う図中横向きに大きく振幅して、ダンパーの周壁部７に対して衝突した際の衝撃に対し、軸体取付部４１の底部２５が破断するのを防ぐことができ、破断による粘性流体１０の漏出を防止することができる。
【００２３】
第３実施形態〔図８〕：本形態のダンパー（図示せず）における軸体取付部５１を図８に示す。このダンパーは、軸体取付部５１の底部２５に形成された緩衝用凸部が、軸体取付部５１の底部２５における軸心線５３上を除く外側位置であると共に、軸体取付部５１の外周面２４ａ部分に形成されていることに特徴がある。図８に示したこの緩衝用凸部５２では、さらに、軸体取付部５１の外周面２４ａ部分における軸体５４の軸直方向（Ｘ）投影領域Ｂを除く外側位置である領域Ｂの最下端よりも距離ｄ_７だけ図中下側で、軸体取付部５１の外底面２５ａよりも距離ｄ_８だけ図中上側となる位置に設けられている。そして、この緩衝用凸部５２の部分だけ、軸体取付部５１の底部２５が肉厚となっている。なお、軸体取付部５１の外周面２４ａ部分における軸体５４の軸直方向（Ｘ）投影領域とは、図８（ａ）の右側面図である図８（ｃ）に示した領域Ｂをいう。
【００２４】
このように、軸体取付部５１の底部２５における、該軸体取付部５１の軸心線５３上を除く外側位置であり、且つ、軸体取付部５１の外周面２４ａ部分における軸体５４の軸直方向（Ｘ）投影領域を除く外側位置に軸体取付部５２が形成されているため、軸交差方向に沿う図中横向きに大きく振幅すると、ゴム状弾性体でなる軸体取付部５１が硬質樹脂材でなる周壁部７に対して強く衝突するが（図１６（ｂ）参照）、こうした衝突が起こっても軸体取付部５１の外周面２４ａに形成された緩衝用凸部５２が、最初に周壁部７と衝突するため、この緩衝用凸部５２に衝突による圧縮応力が集中し、緩衝用凸部５２が弾性変形することにより衝撃力が弱められる。すなわち、ダンパーの周壁部７との衝突のときに軸体５４側からの力が直に働く軸体取付部５１底部２５における軸体５４の軸直方向（Ｘ）投影領域である部分は、周壁部７と衝突しないか、衝突したとしても既に衝撃が弱められているため、かかる部分に加えられる圧縮応力は弱まる。
【００２５】
従って、この実施形態のダンパーでは、特に、防振対象物が軸交差方向に沿って大きく振幅して軸体取付部５１が周壁部７と強く衝突することがあっても、軸体取付部５１の底部２５が破断するのを防ぐことができ、破断による粘性流体１０の漏出を防止することができる。
【００２６】
以上のような第３実施形態のダンパーは、例えば図９、図１０の拡大断面で示す変形形態の軸体取付部５５，５６としても良い。これらの軸体取付部５５，５６は各々異なった形状の緩衝用凸部５７，５８を有する。そして、このような形態であっても破断防止効果を発揮することができる。図９に示す緩衝用凸部５７は、緩衝用凸部５７の軸心方向の厚みｄ_９が、軸体５４の最下端から軸体取付部５５の外底面２５ａまでの距離ｄ_１０と等しくなっている。図１０に示す緩衝用凸部５８は、外周面２４ａ上に８本突出して形成されている。また、この緩衝用凸部５８は、軸体５４の最下端の位置よりも軸心方向（Ｙ）上側に距離ｄ_１１だけ高い位置を上限として軸交差方向に突起している。そして、図９、図１０に示したような形態であっても軸体取付５５，５６の底部２５の破断防止効果を発揮することができる。また、これらの変形形態についても軸体取付部５５，５６を除く他の構成は、図１に示したダンパー２１と同じである。
【００２７】
第４実施形態〔図１１〕：本形態のダンパー（図示せず）における軸体取付部６１を図１１に示す。この軸体取付部６１は、緩衝用凸部６２が、軸体取付部６１の底部２５における軸体取付部６１の軸心線６３上を除く外側位置であって、軸体取付部６１の外底面２５ａ及び軸体取付部６１の外周面２４ａ部分に形成されていることに特徴がある。
【００２８】
軸体取付部６１の底部２５における、軸体取付部６１の外底面２５ａ及び外周面２４ａ上に緩衝用凸部６２が設けられているため、軸心方向（Ｙ）及び軸交差方向の振幅によって、ダンパーの蓋９又は周壁部７と衝突することがあっても、軸体取付部６１底部２５の破断を防止することができる。
【００２９】
以上のような第４実施形態のダンパーは、例えば図１２，図１３の拡大断面で示す変形形態の軸体取付部６４，６５としても良い。図１２に示した軸体取付部６４には緩衝用凸部６６が、図１３に示した軸体取付部６５には緩衝用凸部６７，６８がそれぞれ形成されている。このような形態であっても軸体取付部６４，６５の底部２５の破断防止効果を発揮することができる。
【００３０】
なお、第１〜第４実施形態において、軸体取付部２２，３０，３１，３２，４１，５１，５５，５６，６１，６４，６５以外の構成は従来例と同様として説明したが、ダンパーが軸体取付部２２，３０，３１，３２，４１，５１，５５，５６，６１，６４，６５、周壁部７、可撓部８、蓋９によって構成される形態に限られるものではなく、周壁部がなく、可撓部が直接蓋につながった構成や、周壁部と蓋が一体となって、周壁部と蓋の区別がつかないような構成などであってもよい。
【００３１】
なお、第１〜第４実施形態において、軸体取付部２２，３０，３１，３２，４１，５１，５５，５６，６１，６４，６５及び可撓部８は、ゴム状弾性体で作成され、公知の合成ゴム、熱可塑性エラストマーから適宜選択されて用いられる。合成ゴムとしては、例えば、スチレンブタジエンゴム、ブタジエンゴム、クロロプレンゴム、ニトリルブタジエンゴム、ブチルゴム、エチレンプロピレンゴム、ウレタンゴム、シリコーンゴム、フッ素ゴム、アクリルゴム等が挙げられ、熱可塑性エラストマーとしてはスチレン系、オレフィン系、ウレタン系、エステル系、塩化ビニル系等の各種エラストマーが挙げられる。
【００３２】
また、以上の第１〜第４実施形態では、周壁部７や蓋９のような硬質樹脂部分（ポリプロピレン樹脂製）を含むダンパー２１を例示したが、例えば粘性流体を封入したゴム状弾性体でなる袋状物を容器本体とし、その袋状物を硬質樹脂製の有底筒状のケース内に収納して成るダンパーに本発明を適用してもよい。
【００３３】
さらに、以上の第１〜第４実施形態における蓋（底壁部）９は、硬質樹脂や金属等の剛性のある素材であっても、あるいは上述のようなゴム状弾性体であっても良く、それらを部分的に組合せた構造のものを用いてもかまわない。どのような素材を用いるかは、ダンパーの用いられる場所、支持体との組み付け方法等により決定され、場合により自由に変えることができる。
【００３４】
【発明の効果】
本発明のダンパーによれば、軸体取付部の破断を防止できるため、振動減衰に寄与する流体が破断箇所から漏出して防振性能が低下することを防ぐことができ、また流体として液状の粘性流体を使用した場合には機器内部の汚損を防ぐこともできる。
【図面の簡単な説明】
【図１】本発明の第１実施形態によるダンパーを示し、（ａ）はその断面図、（ｂ）は軸体取付部の底面図である。
【図２】軸体取付部の底部及び周壁部を説明する軸体及び軸体取付部の拡大断面図である。
【図３】本発明の第１実施形態によるダンパーの緩衝用凸部の周囲の部分の拡大断面図である。
【図４】第１実施形態によるダンパーの軸体取付部の変形形態を示し、分図（ｂ）は底面図、分図（ａ）はＳＡ−ＳＡ断面図である。
【図５】第１実施形態によるダンパーの軸体取付部の変形形態を示し、分図（ｂ）は底面図、分図（ａ）はＳＢ−ＳＢ断面図である。
【図６】第１実施形態によるダンパーの軸体取付部の変形形態を示し、分図（ｂ）は底面図、分図（ａ）はＳＣ−ＳＣ断面図である。
【図７】本発明の第２実施形態によるダンパーの軸体取付部を示し、分図（ｂ）は底面図、分図（ａ）はＳＤ−ＳＤ断面図である。
【図８】本発明の第３実施形態によるダンパーの軸体取付部を示し、分図（ｂ）は底面図、分図（ａ）はＳＥ−ＳＥ断面図、分図（ｃ）は右側面図である。
【図９】第３実施形態によるダンパーの軸体取付部の変形形態を示し、分図（ｂ）は底面図、分図（ａ）はＳＦ−ＳＦ断面図である。
【図１０】第３実施形態によるダンパーの軸体取付部の変形形態を示し、分図（ｂ）は底面図、分図（ａ）はＳＧ−ＳＧ断面図である。
【図１１】本発明の第４実施形態によるダンパーの軸体取付部を示し、分図（ｂ）は底面図、分図（ａ）はＳＨ−ＳＨ断面図である。
【図１２】第４実施形態によるダンパーの軸体取付部の変形形態を示し、分図（ｂ）は底面図、分図（ａ）はＳＩ−ＳＩ断面図である。
【図１３】第４実施形態によるダンパーの軸体取付部の変形形態を示し、分図（ｂ）は底面図、分図（ａ）はＳＪ−ＳＪ断面図である。
【図１４】一従来例によるダンパーの使用状態説明図。
【図１５】図１４のダンパーの使用状態拡大断面図。
【図１６】図１４のダンパーの挙動を示す説明図。
【符号の説明】
５，２１ダンパー
５ａ容器本体
６，２３，２８，３６，５４軸体
７周壁部（ダンパーの周壁部）
８可撓部
９蓋
１０粘性流体
１１ａ，２４周壁部（軸体取付部の周壁部）
１１ｂ，２５底部
２４ａ外周面
２５ａ外底面
２２，２２ａ，３０，３１，３２，４１，５１，５５，５６，６１，６４，６５
軸体取付部
２６軸部
２７頭部
２９，３３，３４，３５，４２，５２，５７，５８，６２，６６，６７，６８
緩衝用凸部
２０，５３，６３軸心線
Ｂｐ破断箇所[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a damper, and more particularly to a damper suitable for vibration damping of an audio device or an information device that reads recorded data from a disc-shaped recording medium such as a CD or DVD by a non-contact reading method.
[0002]
[Prior art]
FIG. 14 is a diagram showing a vibration-proof structure of the in-vehicle CD player 1, and a player main body 3 (supported body) for reproducing a music CD is supported by a coil spring 4 inside the housing 2. . A damper 5 fixed to the housing 2 holds a shaft body 6 formed of a hard material such as resin or metal protruding from the bottom surface of the player main body 3, and vibrates acting on the player main body 3. Attenuate.
[0003]
That is, as shown in FIG. 15, the damper 5 is provided with a peripheral wall portion 7 made of, for example, a hard resin such as polypropylene, and the upper opening end thereof is made of a rubber-like elastic material such as a styrene thermoplastic elastomer. The flexible part 8 is sealed. The lower opening end is sealed with a lid 9 made of the same material as that of the peripheral wall 7, and the sealed internal space is filled with a viscous fluid 10 made of silicone oil or the like. A sealed container body 5a is constituted by the peripheral wall portion 7, the flexible portion 8, the lid 9, and the shaft body attaching portion 11 described later.
[0004]
The shaft body attaching portion 11 is formed as a bottomed cylindrical shape integrally formed with a cylindrical peripheral wall portion 11a and a bottom portion 11b having the same outer diameter as the peripheral wall portion 11a and closing the lower opening end of the peripheral wall portion 11a. The vibration acting on the player main body 3 is input to the damper 5 through the shaft body mounting portion 11 that holds the shaft body 6, and the elastic deformation of the flexible portion 8 and the viscous resistance due to the flow of the viscous fluid 10. Is attenuated by
[0005]
[Problems to be solved by the invention]
By the way, in such a conventional damper 5, vibration input in the vicinity of the resonance frequency (particularly in the vicinity of a low frequency of 10 to 30 Hz) is input to the player main body 3, and high acceleration is applied to the player main body 3 when traveling on a rough road. When the impact is applied, the player main body 3 greatly swings in the vertical direction (FIG. 16 (a)) or the horizontal direction (FIG. 16 (b)), and the shaft-like mounting portion 11 made of rubber-like elastic material is made of a hard resin. May collide with the peripheral wall portion 7 and the lid 9 made of the same hard resin, and the bottom portion 11b of the shaft body attaching portion 11 may be broken due to the concentration of compressive stress. And if it breaks, the sealed viscous fluid 10 leaks from the breakage point Bp, so that the original damping effect cannot be exhibited, and the inside of the device may be soiled by the leaked viscous fluid 10.
[0006]
Such a problem is not limited to the damper 5 that uses the viscous resistance caused by the flow of the viscous fluid 10, but is called an air damper that uses the viscous resistance caused by the inflow / outflow of air instead of the viscous fluid 10 for vibration damping. Even a damper has a similar problem in that it cannot exhibit its original damping effect due to air leakage from the broken part.
[0007]
The present invention is based on the background of the above-described conventional technology. The purpose of the present invention is to make the shaft body mounting portion for holding the shaft body of the supported body by the vibration of the supported body greatly caused by vibration. An object of the present invention is to provide a damper in which a shaft body attaching portion is not easily broken even when it collides with an inner side surface.
[0008]
[Means for Solving the Problems]
That is, the present invention provides a bottomed cylindrical shape comprising a peripheral wall portion and a bottom portion for holding a supported body positioned on the primary side or the secondary side of the vibration transmission path by receiving insertion of a shaft body protruding from the supported body. A damper having a flexible portion that floats and supports the shaft body mounting portion so as to be able to follow and displace relative to the supported body on the shaft body insertion opening side, at the bottom of the shaft body mounting portion, A cushioning convex portion is formed at an outer position excluding the axial center line of the shaft body mounting portion.
[0009]
In the damper according to the present invention, since the buffering convex portion is formed at the outer position on the shaft center line of the shaft body mounting portion at the bottom portion (bottom portion) of the shaft body mounting portion, the shaft body mounting portion is displaced in the axial direction. Even in this case, the portion on the shaft center line at the bottom of the shaft body mounting portion to which the force from the shaft body directly acts does not collide strongly with the inner side surface of the damper (for example, a lid made of hard resin). That is, the shock-absorbing convex portion formed at the outer position on the axial center line first collides with the inner surface of the damper, and the impact force is absorbed by the compressive deformation of the shock-absorbing convex portion that is thick and easily deformed. The stress concentration on the bottom of the body attachment portion can be dispersed to make it difficult to break. Further, even if the shaft body attaching portion is displaced in the axis crossing direction (crossing direction including the direction perpendicular to the axis), it does not strongly collide with the inner side surface of the damper (for example, the peripheral wall portion made of hard resin). In other words, in the shaft body mounting portion of the damper, since the buffering convex portion is formed at the bottom of the shaft body, the buffering convex portion formed at the bottom first collides with the inner surface of the damper, and the impact force is It is absorbed by the compressive deformation of the buffering convex portion that is easily deformed, and the stress concentration on the bottom of the shaft body attaching portion can be dispersed to make it difficult to break.
[0010]
The shock-absorbing convex portion exhibiting such an action is preferably formed on the outer bottom surface of the bottom portion of the shaft body mounting portion, particularly for a damper that is assumed to have a large displacement in the axial center line direction of the shaft body mounting portion. A damper that is assumed to have a large displacement in the crossing direction of the mounting portion is preferably formed on the outer peripheral surface of the bottom portion of the shaft body mounting portion. In addition, when displacement in all directions is assumed, for example, when the vibration during vehicle travel is attenuated, it is effective to form both the outer bottom surface and the outer peripheral surface at the bottom.
[0011]
Of the above, the damper that forms the buffering convex portion on the outer bottom surface of the bottom portion of the shaft body mounting portion is preferably formed at a position outside the axial projection region of the shaft body. That is, since this buffering convex portion does not overlap with the axial projection area of the shaft body, the shaft body mounting portion is displaced in the axial direction and collides with the inner surface of the damper (for example, a lid made of hard resin). In addition, since the force transmitted in the axial direction of the shaft body is not transmitted linearly and directly to the buffering convex portion, it can be transferred to the outer side of the projection region in a detour, so the stress on the buffering convex portion The dispersion effect is further enhanced.
[0012]
In addition, with respect to the damper in which the buffering convex portion is formed on the outer bottom surface of the bottom portion of the shaft body mounting portion, the buffering convex portion is extended further outward in the radial direction than the outer peripheral surface of the peripheral wall portion of the shaft body mounting portion. It is good also as what was made to project. With this damper, even if the shaft body mounting portion is displaced in the axis crossing direction and collides with the inner surface of the damper (for example, a peripheral wall portion made of hard resin), the impact force is caused to protrude from the buffering convex portion. Since it is absorbed by the portion, the stress concentration on the bottom of the shaft body mounting portion is dispersed and is difficult to break.
[0013]
By the way, when the buffering convex portion is formed on the outer peripheral surface of the bottom portion of the shaft body mounting portion, it is preferably formed at an outer position excluding the axial direction projection region of the shaft body. In this way, even if the shaft body mounting portion is displaced in the axis crossing direction and collides with the inner surface of the damper (for example, a peripheral wall portion made of hard resin), the force transmitted in the axis crossing direction of the shaft body is linear and direct. This is because the stress distribution effect by the buffering convex portion can be further enhanced because the signal can be transferred to the outside position of the projection region without being transmitted to the buffering convex portion.
[0014]
It is difficult to break the shaft body mounting portion by the buffering convex portion as described above. The viscous fluid-sealed damper uses the flow resistance of a liquid viscous fluid such as silicone oil sealed inside the damper for vibration damping. Not only is this a common issue for air dampers that use flow resistance caused by air inflow and outflow for vibration damping. The specific configuration of the viscous fluid-filled damper includes a peripheral wall portion made of hard resin and a lid that closes one end opening of the peripheral wall portion, and the other end opening of the peripheral wall portion is the shaft body mounting portion. The container body closed by the flexible part having the above-described structure is provided, and a liquid viscous fluid is enclosed in the container body. In this case, the lid that closes the one end opening of the peripheral wall portion is formed entirely of a hard resin, even if the entire lid is formed of a hard resin, or The outer portion fixed to the peripheral wall portion may be made of a hard resin, and the inner portion facing the bottom portion of the shaft body attaching portion may be formed of a thermoplastic elastomer. On the other hand, as a specific configuration of the air damper, a cylindrical peripheral wall portion made of a hard resin, and a lid that closes one end opening of the peripheral wall portion, the other end opening of the peripheral wall portion is the shaft body attaching portion. A container body closed by the flexible part, and a ventilation hole that circulates inside and outside the container body is formed in the peripheral wall part.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the damper of this invention is demonstrated, referring drawings. In addition, about the same part as a prior art, the same code | symbol is attached | subjected and duplication description is abbreviate | omitted.
[0016]
First Embodiment [FIG. 1] A damper 21 according to a first embodiment of the present invention is shown in FIG. 1, and this damper 21 is characterized by an outer surface of a shaft body mounting portion 22. On the other hand, the inner side surface of the shaft body mounting portion 22 has a shape corresponding to the shape of the shaft body 23, and the shape of the inner side surface is arbitrary. The rest of the configuration other than the shaft body attachment portion 22 is the same as that of the damper 5 of the conventional example (see FIG. 15).
[0017]
The shaft body mounting portion 22 is for inserting and holding the shaft body 23 protruding from the supported body (see FIG. 14), and has a bottomed cylindrical shape composed of the peripheral wall portion 24 and the bottom portion 25. . The boundary between the peripheral wall portion 24 and the bottom portion 25 of the shaft body attaching portion 22 is distinguished as follows. That is, as shown in FIG. 2A, the shaft body 23 held by the shaft body mounting portion 22 has a shaft portion 26 having an outer diameter equal to the length along the aa ′ line, The shaft body 23 is divided into a head portion 27 that functions to prevent the shaft body attachment portion 22 from coming off. When the shaft body 23 is inserted into the shaft body attachment portion 22, the head portion of the shaft body 23 in the shaft body attachment portion 22 is provided. 27, the portion corresponding to the front side, that is, the bottom side (lower side in the figure) from the line aa ′ is the bottom part 25 of the shaft body mounting portion 22, and the base side (in the figure) from the line aa ′. The upper side) is the peripheral wall portion 24. Since the shaft body 28 shown in FIG. 2 (b) does not have a head, the portion corresponding to the tip of the shaft body 28 in the shaft body mounting portion 22a, that is, the bottom side from the line bb ′ ( The lower side in the figure is defined as the bottom portion 25.
[0018]
In the damper 21 according to the first embodiment, the buffering convex portion formed on the bottom portion 25 of the shaft body mounting portion 22 is an outer position excluding the axis 20 on the bottom portion 25 of the shaft body mounting portion 22. It is characterized in that it is formed on the outer bottom surface 25a of the body mounting portion 22. In this buffering convex portion 29 shown in FIG. 1, as shown in FIGS. 1 and 3, the shaft is located outside the diameter of the projection area A in the axial direction (Y) of the shaft body 23 by a distance d _1. It is provided at a position that is on the inner side by a distance d ₂ than the outer diameter of the body mounting portion 22. And only the part of this buffering convex part 29, the bottom part 25 of the shaft body attaching part 22 is thick.
[0019]
As described above, since the buffer convex portion 29 is formed in an annular shape on the outer bottom surface 25a of the shaft body mounting portion 22, for example, a vehicle-mounted CD that is a vibration-proof object fixed to the base end side of the shaft body 23, for example. When the player body (see FIG. 14) of the player receives strong vibrations and greatly swings downward in the figure along the axial direction (Y), the shaft body mounting portion 22 made of a rubber-like elastic body has a lid 9 made of a hard resin material. However, even if such a collision occurs, the buffering convex portion 29 formed on the outer bottom surface 25a of the shaft body mounting portion 22 first collides with the lid 9. The compressive stress due to the collision is concentrated on the buffering convex portion 29, and the shocking force is weakened by the elastic deformation of the buffering convex portion 29. That is, the axial center direction (Y) projection area A of the shaft body 23 in the bottom portion 25 of the shaft body mounting portion 22 to which the force from the shaft body 23 side is directly applied does not collide with the lid 9 or collides. However, since the impact is already weakened, the compressive stress applied to such a portion is reduced.
[0020]
Therefore, in the damper 21 of this embodiment, in particular, even if the vibration isolating object greatly swings along the axial direction (Y) and the shaft body mounting portion 22 strongly collides with the lid 9, the shaft body The bottom portion 25 of the attachment portion 22 can be prevented from breaking, and the viscous fluid 10 can be prevented from leaking due to the breaking.
[0021]
In the damper 21 of the first embodiment as described above, the shaft body mounting portion 22 may be changed to the shaft body mounting portions 30, 31, 32 of the modified form shown in the enlarged cross sections of FIGS. These shaft body attaching portions 30, 31, and 32 have different buffering convex portions 33, 34, and 35, respectively. In the buffering convex portion 33 shown in FIG. 4, the width d _{4 of the} convex portion is equal to the width d ₃ of the peripheral wall portion 24 of the shaft body attaching portion 30. Further, the buffer protrusion 34 shown in FIG. 5, the inner cushioning protrusions 34 inside the distance d ₅ than the axial direction (Y) the projection area of the shaft 36, the outer diameter of the shaft body mounting portion 31 provided only inside a position a distance d ₆ than. Further, the buffering convex portion 35 shown in FIG. 6 is a columnar convex portion whose tip is cut into a dome shape, and is formed so as to protrude on the outer bottom surface 25a. And even if it is a form as shown in FIGS. 4-6, the fracture | rupture prevention effect of the bottom part 25 of the shaft body attaching part 30,31,32 can be exhibited. Moreover, also about these deformation | transformation forms, the structure of those other than the shaft body attaching part 30,31,32 is the same as the damper 21 shown in FIG. Note that, like the shaft body attaching portion 31 shown in FIG. 5, the buffering convex portion 34 is provided up to a position (inner position) including the axial direction projection region of the shaft body 36, and the length of the distance d ₅ is long. In such a case, the deformation of the buffering convex portion is difficult, and stress relaxation due to the deformation is suppressed. Therefore, the buffer convex portion 33 shown in FIG. 4 is more preferable than the buffer convex portion 34 shown in FIG.
[0022]
Second Embodiment [FIG. 7] : A shaft body mounting portion 41 in a damper (not shown) of this embodiment is shown in FIG. In this shaft body mounting portion 41, the buffering convex portion 42 formed on the outer bottom surface 25 a of the shaft body mounting portion 41 further protrudes radially outward from the outer peripheral surface 24 a of the shaft body mounting portion 41. There are features. The shaft body mounting portion 41 of this form is difficult to be removed from the mold after molding. However, as shown in the third embodiment, the shaft body mounting portion 41 is oriented sideways in the figure along the axis crossing direction. It is possible to prevent the bottom portion 25 of the shaft body mounting portion 41 from breaking due to a large amplitude and colliding against the peripheral wall portion 7 of the damper, and to prevent the viscous fluid 10 from leaking due to the breaking. Can do.
[0023]
Third Embodiment [FIG. 8] : FIG. 8 shows a shaft body attaching portion 51 in a damper (not shown) of this embodiment. In this damper, the cushioning convex portion formed on the bottom portion 25 of the shaft body mounting portion 51 is an outer position excluding the axis line 53 on the bottom portion 25 of the shaft body mounting portion 51, and the shaft body mounting portion 51 It is characterized in that it is formed on the outer peripheral surface 24a. In the buffering convex portion 52 shown in FIG. 8, the lowermost end of the region B which is the outer position excluding the projection region B in the axial direction (X) direction of the shaft body 54 in the outer peripheral surface 24 a portion of the shaft body mounting portion 51. Further, it is provided at a position lower than the distance d _{7 in the} drawing by a distance d _{7 and above} the outer bottom surface 25 a of the shaft body mounting portion 51 by a distance d _{8 in the} drawing. And only the part of this convex part 52 for buffering has the bottom 25 of the shaft body attaching part 51 thick. The axial direction (X) projection region of the shaft body 54 in the outer peripheral surface 24a portion of the shaft body attaching portion 51 is the region B shown in FIG. 8C which is a right side view of FIG. Say.
[0024]
As described above, the bottom portion 25 of the shaft body mounting portion 51 is located outside the shaft center line 53 of the shaft body mounting portion 51, and the shaft body 54 in the outer peripheral surface 24 a portion of the shaft body mounting portion 51. Since the shaft body mounting portion 52 is formed at an outer position excluding the projection direction in the direction perpendicular to the axis (X), when the shaft body mounting portion 51 made of a rubber-like elastic body is greatly swung in the horizontal direction in the drawing along the axis crossing direction. Although it strongly collides with the peripheral wall portion 7 made of a hard resin material (see FIG. 16B), even if such a collision occurs, the cushioning convex portion 52 formed on the outer peripheral surface 24a of the shaft body attaching portion 51 is Since it first collides with the peripheral wall portion 7, the compressive stress due to the collision concentrates on the buffering convex portion 52, and the shocking force is weakened by the elastic deformation of the buffering convex portion 52. That is, the portion that is the axial direction (X) projection region of the shaft body 54 in the bottom body 25 of the shaft body mounting portion 51 where the force from the shaft body 54 side acts directly upon a collision with the peripheral wall portion 7 of the damper is the peripheral wall Even if it does not collide with the part 7, or even if it collides, since the impact has already been weakened, the compressive stress applied to the part is weakened.
[0025]
Therefore, in the damper of this embodiment, in particular, even if the vibration isolating object greatly swings along the axis crossing direction and the shaft body mounting portion 51 strongly collides with the peripheral wall portion 7, the shaft body mounting portion 51. Can be prevented from breaking, and leakage of the viscous fluid 10 due to breakage can be prevented.
[0026]
The damper of 3rd Embodiment as mentioned above is good also as the shaft body attaching parts 55 and 56 of the deformation | transformation form shown, for example in the expanded cross section of FIG. 9, FIG. These shaft body attaching portions 55 and 56 have buffer convex portions 57 and 58 having different shapes. And even if it is such a form, the fracture | rupture prevention effect can be exhibited. Buffer protrusion 57 shown in FIG. 9, the axis of the thickness d ₉ cushioning protrusions 57, become equal to the distance d ₁₀ from the lowermost end of the shaft 54 to the outer bottom surface 25a of the shaft mounting portion 55 ing. 10 are formed so as to protrude on the outer peripheral surface 24a. Further, the cushioning projection 58 is protruding in the axial cross-direction up to the axial direction (Y) by a distance d ₁₁ in the upper position higher than the position of the lowermost end of the shaft 54. And even if it is a form as shown in FIG. 9, FIG. 10, the fracture | rupture prevention effect of the bottom part 25 of the shaft body attachments 55 and 56 can be exhibited. Moreover, also about these deformation | transformation forms, the structure of those other than the shaft body attaching parts 55 and 56 is the same as the damper 21 shown in FIG.
[0027]
4th Embodiment [FIG. 11] : The shaft body attaching part 61 in the damper (not shown) of this form is shown in FIG. The shaft body mounting portion 61 is configured such that the buffering convex portion 62 is an outer position of the bottom 25 of the shaft body mounting portion 61 except for the axis 63 of the shaft body mounting portion 61, and is outside the shaft body mounting portion 61. It is characterized in that it is formed on the bottom surface 25 a and the outer peripheral surface 24 a portion of the shaft body mounting portion 61.
[0028]
Since the buffering convex portions 62 are provided on the outer bottom surface 25a and the outer peripheral surface 24a of the shaft body mounting portion 61 at the bottom portion 25 of the shaft body mounting portion 61, depending on the amplitude in the axial direction (Y) and the axis crossing direction. Even if it collides with the lid 9 or the peripheral wall portion 7 of the damper, it is possible to prevent the bottom 25 of the shaft body attaching portion 61 from being broken.
[0029]
The damper of 4th Embodiment as mentioned above is good also as the shaft body attaching parts 64 and 65 of the deformation | transformation form shown, for example in the expanded cross section of FIG. 12, FIG. The shaft body mounting portion 64 shown in FIG. 12 is formed with buffering convex portions 66, and the shaft body mounting portion 65 shown in FIG. 13 is formed with buffering convex portions 67 and 68, respectively. Even if it is such a form, the fracture | rupture prevention effect of the bottom part 25 of the shaft body attaching parts 64 and 65 can be exhibited.
[0030]
In the first to fourth embodiments, the configuration other than the shaft body attaching portions 22, 30, 31, 32, 41, 51, 55, 56, 61, 64, 65 has been described as the same as the conventional example. Is not limited to the form constituted by the shaft body attaching portions 22, 30, 31, 32, 41, 51, 55, 56, 61, 64, 65, the peripheral wall portion 7, the flexible portion 8, and the lid 9. There may be a configuration in which there is no peripheral wall portion and the flexible portion is directly connected to the lid, or a configuration in which the peripheral wall portion and the lid are integrated so that the peripheral wall portion and the lid cannot be distinguished.
[0031]
In the first to fourth embodiments, the shaft body attaching portions 22, 30, 31, 32, 41, 51, 55, 56, 61, 64, 65 and the flexible portion 8 are made of a rubber-like elastic body. These are appropriately selected from known synthetic rubbers and thermoplastic elastomers. Examples of the synthetic rubber include styrene butadiene rubber, butadiene rubber, chloroprene rubber, nitrile butadiene rubber, butyl rubber, ethylene propylene rubber, urethane rubber, silicone rubber, fluorine rubber, acrylic rubber, and the like. And various elastomers such as olefin, urethane, ester, and vinyl chloride.
[0032]
In the first to fourth embodiments described above, the damper 21 including the hard resin portion (made of polypropylene resin) such as the peripheral wall portion 7 and the lid 9 is illustrated. However, for example, a rubber-like elastic body enclosing a viscous fluid is used. The present invention may be applied to a damper formed by using a bag-like product as a container body and housing the bag-like product in a bottomed cylindrical case made of hard resin.
[0033]
Further, the lid (bottom wall portion) 9 in the first to fourth embodiments described above may be a rigid material such as hard resin or metal, or may be a rubber-like elastic body as described above. A structure obtained by partially combining them may be used. The type of material used is determined by the location where the damper is used, the method of assembling with the support, and the like, and can be freely changed depending on the case.
[0034]
【The invention's effect】
According to the damper of the present invention, it is possible to prevent the shaft body mounting portion from being broken, so that it is possible to prevent the fluid contributing to vibration damping from leaking from the broken portion and reducing the vibration proof performance, and the fluid is liquid. When a viscous fluid is used, the inside of the equipment can be prevented from being damaged.
[Brief description of the drawings]
1A and 1B show a damper according to a first embodiment of the present invention, in which FIG. 1A is a sectional view thereof, and FIG. 1B is a bottom view of a shaft body attaching portion.
FIG. 2 is an enlarged cross-sectional view of a shaft body and a shaft body mounting portion for explaining a bottom portion and a peripheral wall portion of the shaft body mounting portion.
FIG. 3 is an enlarged cross-sectional view of a portion around a buffering convex portion of the damper according to the first embodiment of the present invention.
FIGS. 4A and 4B show a modified form of the shaft body attaching portion of the damper according to the first embodiment, wherein a partial view (b) is a bottom view and a partial view (a) is a cross-sectional view of SA-SA. FIGS.
FIGS. 5A and 5B show a modified form of the shaft body attaching portion of the damper according to the first embodiment, wherein a partial view (b) is a bottom view and a partial view (a) is a SB-SB cross-sectional view.
6A and 6B show a modified embodiment of the shaft body attaching portion of the damper according to the first embodiment, wherein a partial view (b) is a bottom view and a partial view (a) is an SC-SC cross-sectional view.
FIGS. 7A and 7B show a shaft body attaching portion of a damper according to a second embodiment of the present invention, in which FIG. 7B is a bottom view and FIG. 7A is an SD-SD cross-sectional view.
FIGS. 8A and 8B show a shaft body mounting portion of a damper according to a third embodiment of the present invention, wherein a partial view (b) is a bottom view, a partial view (a) is a cross-sectional view of SE-SE, and a partial view (c) is a right side view. FIG.
FIGS. 9A and 9B show a modified form of the shaft body attaching portion of the damper according to the third embodiment, wherein a partial view (b) is a bottom view and a partial view (a) is an SF-SF cross-sectional view.
FIGS. 10A and 10B show a modified form of the shaft body attaching portion of the damper according to the third embodiment, wherein a partial view (b) is a bottom view and a partial view (a) is an SG-SG sectional view. FIGS.
FIGS. 11A and 11B show a shaft body attaching portion of a damper according to a fourth embodiment of the present invention, in which FIG. 11B is a bottom view and FIG. 11A is an SH-SH cross-sectional view.
FIGS. 12A and 12B show a modified form of the shaft body attaching portion of the damper according to the fourth embodiment, wherein a partial view (b) is a bottom view, and a partial view (a) is an SI-SI cross-sectional view.
FIGS. 13A and 13B show a modification of the shaft body attaching portion of the damper according to the fourth embodiment, wherein a partial view (b) is a bottom view and a partial view (a) is an SJ-SJ cross-sectional view.
FIG. 14 is an explanatory diagram of a use state of a damper according to a conventional example.
15 is an enlarged sectional view of the damper of FIG. 14 in use.
16 is an explanatory diagram showing the behavior of the damper of FIG. 14;
[Explanation of symbols]
5, 21 Damper 5a Container body 6, 23, 28, 36, 54 Shaft body 7 peripheral wall (peripheral wall of damper)
8 Flexible part 9 Lid 10 Viscous fluid 11a, 24 Peripheral wall part (peripheral wall part of shaft body attaching part)
11b, 25 Bottom 24a Outer peripheral surface 25a Outer bottom surface 22, 22a, 30, 31, 32, 41, 51, 55, 56, 61, 64, 65
Shaft body mounting portion 26 Shaft portion 27 Head portions 29, 33, 34, 35, 42, 52, 57, 58, 62, 66, 67, 68
Buffer convex part 20, 53, 63 Axial line Bp Broken point

Claims

A viscous fluid is sealed inside the container body sealed with a lid, and a supported body positioned on the primary or secondary side of the vibration transmission path is connected to the container body with a shaft body projecting from the supported body. It has a bottomed cylindrical shaft body mounting part that consists of a peripheral wall part and a bottom part that receives and holds the insertion, and this shaft body mounting part is floating supported so that it can follow and displace relative to the supported body at the shaft body insertion opening side. In a viscous fluid-filled damper having a flexible part
A viscous fluid characterized in that a buffering convex portion that protrudes from both the outer bottom surface and the outer peripheral surface of the bottom portion is formed at an outer position of the bottom portion of the shaft body mounting portion, except on the axial center line of the shaft body mounting portion. Enclosed damper.

The viscous fluid-filled damper according to claim 1 , wherein a buffering convex portion is formed on the outer bottom surface at a position outside the axial projection region of the shaft body.

The viscous fluid-filled damper according to claim 1 , wherein the buffering convex portion is formed at an outer position of the outer peripheral surface portion excluding the axial direction projection region of the shaft body.

The container body is provided with a peripheral wall portion made of a hard resin that is cylindrical and connected to the flexible portion along the axial direction of the shaft body mounting portion ,
The lid is either one of a hard resin material, a soft resin material, or a soft resin material that closes one end opening of the peripheral wall portion, and a soft resin material and a hard resin material that is an outer portion of the central portion . The viscous fluid-filled damper according to any one of claims 1 to 3, wherein the damper is a lid made of