JP4306896B2

JP4306896B2 - Heat shield support device

Info

Publication number: JP4306896B2
Application number: JP29529899A
Authority: JP
Inventors: 益彦村田; 和年吉田
Original assignee: Nippon Reinz Co Ltd
Current assignee: Nippon Reinz Co Ltd
Priority date: 1999-10-18
Filing date: 1999-10-18
Publication date: 2009-08-05
Anticipated expiration: 2019-10-18
Also published as: JP2001115853A

Description

【０００１】
【発明の属する技術分野】
本発明に係る遮熱板用支持装置は、エキゾーストマニホールド、ターボチャージャー等、運転時に高温となる部分を覆う状態で設置する遮熱板を支持する部分の構造の改良に関し、運転時に伝わる振動により、耳障りな異音が発生するのを防止するものである。
【０００２】
【従来の技術】
自動車用エンジンの排気を導く為、このエンジンのシリンダヘッドの側面にその上流端部を接続したエキゾーストマニホールドの温度は、内部を流れる排気の熱により、相当に上昇する。この様に温度上昇したエキゾーストマニホールドから放射される輻射熱から、エンジンルーム内に設けた他の機器等を保護する為に、上記エキゾーストマニホールドをヒートインシュレータと呼ばれる遮熱板により覆い、このエキゾーストマニホールドからの輻射熱が上記他の機器等に伝わるのを防止している。エンジンに過給する為のターボタージャーに関しても同様である。
【０００３】
図２は、この様な遮熱板１の１例を示している。この遮熱板１は、鋼板の単板、或はアルミニウムメッキを施した鋼板により吸音材をサンドイッチした複合板をプレス加工する事により、上記エキゾーストマニホールドを若干の隙間を介在させた状態で覆える様な形状及び大きさに形成している。この様な遮熱板１は、複数個所に設けた円形の取付孔２、２に挿通したボルト、スタッド等の結合部材により、上記エキゾーストマニホールドに設けた取付座等の取付部に支持固定している。
【０００４】
このエキゾーストマニホールドは、エンジンの運転時エンジン内から出て来る音を放射する為、この放射音に基づいて上記遮熱板１が振動し、耳障りな騒音を発生しない様に、この遮熱板１と上記結合部材との間には、緩衝材を設けている。図３は、この遮熱板１を上記取付部に支持固定する為の遮熱板用支持装置の従来構造の第１例を示している。この第１例の構造では、上記遮熱板１の複数個所に形成した、それぞれが円形である取付孔２の内側に、円筒状のスリーブ３を挿通している。又、この取付孔２の周囲部分には、緩衝ユニットを構成する１対の緩衝素子４、４を、上記遮熱板１を表裏両面側から挟持する状態で配設している。これら各緩衝素子４、４は、ステンレス鋼等の、弾性を有する耐熱材製のフィラメントを編組して成る素材を更に加圧成形する事により、断面矩形で全体を円環状に形成している。又、上記両緩衝素子４、４の外端面（上記遮熱板１と反対側面）には、それぞれ断面Ｌ字形で全体を円輪状に構成したワッシャ５、５を重ね合わせている。図３に示した従来構造の第１例の場合には、上記各緩衝素子４、４の内径は、上記取付孔２の内径よりも大きく、上記各ワッシャ５、５の内径は、この取付孔２の内径よりも小さい。
【０００５】
上述の様な各部材を組み合わせて成る、従来構造の第１例の遮熱板用支持装置により、上記遮熱板１を上記取付部に支持固定するには、ボルト、スタッド等の、図示しない結合部材を上記スリーブ３に挿通し、この結合部材と、上記取付部に形成したねじ孔（結合部材がボルトの場合）或はナット（結合部材が、上記取付部にその基端部を固定したスタッドである場合）とを螺合し、更に緊締する。この状態で、上記スリーブ３が、上記取付部の外端面とボルトの頭部或はナットとの間で強く挟持されて、この取付部に固定される。同時に、上記各緩衝素子４、４が、上記遮熱板１の表裏両面と上記各ワッシャ５、５との間で弾性的に圧縮されて、この遮熱板１が上記取付部に、緩衝的に支持される。
【０００６】
又、図４は、遮熱板１を取付部に支持固定する為の遮熱板用支持装置の従来構造の第２例を示している。この第２例の構造では、上記遮熱板１に形成した取付孔２の内側に挿通した円筒状のスリーブ３の周囲に、互いに形状の異なる１対の緩衝素子４ａ、４ｂを配置し、緩衝ユニットを構成している。上述した第１例の場合と同様、弾性を有する耐熱材製のフィラメントを編組して成る素材を更に加圧成形して成る、上記両緩衝素子４ａ、４ｂのうち、一方（図４の上方）の緩衝素子４ａは、単なる断面矩形で全体を円環状に形成している。これに対して他方（図４の下方）の緩衝素子４ｂは、大径部６と小径部７とから成るもので、略Ｌ字形の断面形状を有し、全体を短円筒状に形成している。そして、上記一方の緩衝素子４ａを上記他方の緩衝素子４ｂの小径部７に外嵌した状態で、この一方の緩衝素子４ａと上記大径部６との間で、上記遮熱板１の一部で上記取付孔２の周縁部分を挟持している。
【０００７】
上述の様な各部材を組み合わせて成る、従来構造の第２例の遮熱板用支持装置により、上記遮熱板１を上記取付部に支持固定するには、ボルト、スタッド等の、図示しない結合部材を、上記他方の緩衝部材４ｂの内径側に挿通したスリーブ３に挿通し、この結合部材と、上記取付部に形成したねじ孔或はナットとを螺合し、更に緊締する。この状態で、上記スリーブ３が取付部に固定されると同時に、上記各緩衝素子４ａ、４ｂが、上記遮熱板１の表裏両面と上記ボルトの頭部又はナットとの間で弾性的に圧縮されて、この遮熱板１が上記取付部に、緩衝的に支持される。
【０００８】
【発明が解決しようとする課題】
図３に示した従来構造の第１例の場合には、取付孔２の内周縁とスリーブ３の中間部外周面とが、緩衝材４を介する事なく、直接対向している。この為、エンジンの運転に伴って発生する振動により、遮熱板１が上記スリーブ３の直径方向にずれ動き、このスリーブ３の中間部外周面と上記取付孔２の内周縁とが当接する可能性がある。それぞれが金属製の剛体である、スリーブ３の中間部外周面と遮熱板１に形成した取付孔２の内周縁とが当接した状態のまま振動が加わると、当接部でびびり音が発生し、乗員や周囲にいる者に不快感を与える為、好ましくない。
【０００９】
図４に示した従来構造の第２例の場合には、取付孔２の内周縁とスリーブ３の中間部外周面との間に、他方の緩衝材４ｂの小径部７が存在する為、上述の様なびびり音の発生を防止できる代わりに、コストが嵩み、しかも安定した性能を得にくい。即ち、上記第２例の構造の場合には、２種類の緩衝材４ａ、４ｂを使用する為、製造、部品管理が面倒になり、コストが嵩む原因となる。しかも、軟らかく変形し易い、上記他方の緩衝材４ｂの小径部７を、一方の緩衝材４ａの内径側に挿入する作業は難しく、組立作業の能率を悪化させて、やはりコストが嵩む原因となる。更に、軸方向（図４の上下方向）に長く、しかも直径方向に関する厚さ寸法が小さい小径部７の密度を均一且つ所望値通りにする事は難しく、この小径部７の形状保持性が悪くなり易い為、所望通りの性能を発揮しにくい。
本発明の遮熱板用支持装置は、上述の様な不都合を何れも解消すべく発明したものである。
【００１０】
【課題を解決するための手段】
本発明の遮熱板用支持装置は、前述した従来から知られている遮熱板用支持装置と同様に、遮熱板に形成した円形の取付孔の内側に円筒状のスリーブを、弾性を有する緩衝ユニットを介して支持し、このスリーブを挿通した結合部材により、上記遮熱板を取付部に緩衝的に支持する。
特に、本発明の遮熱板用支持装置に於いては、上記スリーブの両端部に外嵌した１対のワッシャにより上記緩衝ユニットを軸方向両側から挟持しており、これら各ワッシャは、それぞれの内周縁部に円筒部を設けたものであって、それぞれの円筒部を互いに対向させた状態で上記スリーブに外嵌している。又、上記緩衝ユニットは、それぞれが耐熱材製のフィラメントを編組して成る素材を更に加圧成形して成る、円環状で同一形状を有する１対の緩衝素子を軸方向に関して互いに対称に配置した状態で組み合わせて成るものである。又、上記各緩衝素子は、互いに対向する面の内周縁部に、その高さ寸法が上記遮熱板の厚さ寸法よりも小さく、且つ上記取付孔の内部に進入自在な凸部を形成すると共に、互いに反対側の面の内周縁部に凹部を形成したものである。そして、上記各緩衝素子は、これら各凸部を上記取付孔の内周縁と上記スリーブの中間部外周面との間の環状隙間に、この取付孔の両端開口から挿入すると共に、上記各凹部に上記各ワッシャの円筒部を進入させ、更に、上記スリーブの両端外周縁部を直径方向外方にかしめ広げ、このスリーブと上記各ワッシャとの分離防止を図った状態で、上記緩衝ユニットを構成している。
【００１１】
【作用】
上述の様に構成する本発明の遮熱板用支持装置によれば、遮熱板に形成した取付孔の内周縁とスリーブの中間部外周面との間に、緩衝ユニットを構成する１対の緩衝素子にそれぞれ設けた凸部が存在するので、上記取付孔の内周縁とスリーブの中間部外周面とが直接当接する事を防止し、びびり音の発生防止を確実に図れる。又、上記各緩衝素子として、同一形状を有するものを使用するので、製造、部品管理の簡略化によるコスト低減を図れる。しかも、上記各緩衝素子に、軸方向に長く、しかも直径方向に関する厚さ寸法が小さい部分が存在しないので、上記各緩衝素子の密度を、所望値通りに、しかも均一に加工する作業を容易に行なえる。又、組立時には、軸方向寸法が小さい上記凸部を、上記取付孔の内周縁と上記スリーブの中間部外周面との間の環状隙間に挿入すれば良い為、組立作業が容易で、組立作業の能率化によるコスト低減も図れる。更に、上記スリーブと各ワッシャとの分離防止を図っているので、上記遮熱板と、このスリーブ、上記各緩衝素子、これら各ワッシャとを一体的に取り扱える様になって、上記遮熱板の取り扱い性及び組み付け性の向上を図れる。
【００１２】
【発明の実施の形態】
図１は、本発明の実施の形態の１例を示している。遮熱板１に形成した円形の取付孔２の内側に、鋼、ステンレス鋼等の金属製で円筒状のスリーブ３を、弾性を有する耐熱材製の緩衝ユニット８を介して支持している。そして、このスリーブ３を挿通した、ボルト或はスタッド等の図示しない結合部材により、上記遮熱板１を、エキゾーストマニホールド等、運転時に高温になる部分に設けた取付部に緩衝的に支持する。又、上記緩衝ユニット８は、それぞれ断面Ｌ字形で全体を円輪状に構成したワッシャ５、５により、軸方向（図１の上下方向）両側から挟持している。これら両ワッシャ５、５の内周縁部に形成した円筒部１２の内径は、上記スリーブ３にがたつきなく外嵌自在な大きさとし、同じく外径は、上記取付孔２の内径よりも小さくしている。
【００１３】
上記緩衝ユニット８は、それぞれが円環状で同一形状を有する１対の緩衝素子４ｃ、４ｃを、軸方向（図１の上下方向）に関し互いに対称に配置した状態で組み合わせて成る。上記各緩衝素子４ｃ、４ｃはそれぞれ、断面形状が矩形の主部９の内周縁部のうち、互いに対向する面に環状の凸部１０を、反対側の面に環状の凹部１１を、それぞれ形成して成る。このうちの凸部１０の自由状態での高さ寸法Ｈ₁₀は、上記遮熱板１の厚さ寸法Ｔ₁ よりも小さく、好ましくはこの厚さ寸法Ｔ₁ の半分以上（Ｔ₁ ／２≦Ｈ₁₀＜Ｔ₁ ）としている。但し、上記凸部１０が確実に上記取付孔２内に入り込むのであれば、上記凸部１０の自由状態での高さ寸法Ｈ₁₀を、必ずしも上記遮熱板１の厚さ寸法Ｔ₁ の半分以上にする必要はない。例えば、この遮熱板１の厚さ寸法Ｔ₁ が大きければ、この厚さ寸法Ｔ₁ の１／３以上（Ｈ₁₀≧Ｔ₁ ／３）確保すれば十分な場合もある。一方、上記凹部１１は、上記各ワッシャ５、５の内周縁部に形成した円筒部１２を挿入自在な大きさとしている。尚、上記凹部１１は、この円筒部１２を収納すべく、全周に亙って形成する必要があるが、上記凸部１０は、必ずしも全周に亙って形成する必要はない。円周方向複数個所に間欠的に形成しても良い。
【００１４】
又、上述の様な各緩衝素子４ｃ、４ｃは、外径が０．０８〜０．２０mm、好ましくは０．１０〜０．１５mmのステンレス製フィラメントを編組して成る素材を更に加圧成形し、見掛け嵩密度を０．１２〜０．２０、好ましくは０．１４〜０．１８にして成る。上記フィラメントの外径が０．０８mm未満の場合には、このフィラメントの剛性が低くなり過ぎて、上記各緩衝素子４ｃ、４ｃに必要とする弾性を得る事が難しくなり、長期間に亙り十分な制振効果を維持する事が難しくなる。これに対して上記フィラメントの外径が０．２０mmを越える場合には、このフィラメントの剛性が高くなり過ぎて、上記各緩衝素子４ｃ、４ｃの剛性が高くなり過ぎ、制振効果が低くなる。上記外径を０．０８〜０．２０mm、好ましくは０．１０〜０．１５mmに規制すれば、初期から長期間経過後に至るまで、十分な制振効果を得る事ができる。
【００１５】
又、見掛け嵩密度が０．１２未満の場合には、空隙率が高過ぎて、極く軽い力で変形する様になり、上記各緩衝素子４ｃ、４ｃに必要とする弾性を得る事が難しくなって、長期間に亙り十分な制振効果を維持する事が難しくなる。これに対して上記見掛け嵩密度が０．２０を越える場合には、空隙率が低過ぎて、変形させる為に要する力が大きくなり、上記各緩衝素子４ｃ、４ｃの剛性が高くなり過ぎ、制振効果が低くなる。上記見掛け嵩密度を０．１２〜０．２０、好ましくは０．１４〜０．１８に規制すれば、初期から長期間経過後に至るまで、十分な制振効果を得る事ができる。更に、上記各緩衝素子４ｃ、４ｃのうち、前記凸部１０、１０を除く部分の厚さＴ_4cは、図１に示す様に組み立てた状態で２〜５mm、好ましくは３〜４mmとする。この厚さＴ_4cが小さ過ぎた場合には剛性が高くなり過ぎ、大き過ぎた場合には剛性が低くなり過ぎて、何れにしても長期間に亙り十分な制振効果を得る事が難しくなる。
【００１６】
又、組み付け状態での厚さＴ_4cが自由状態での厚さに対する割合は、０．８５〜０．９５程度とする。この割合が小さ過ぎた場合（組み付けに伴う上記各緩衝素子４ｃ、４ｃの圧縮量が大き過ぎた場合）には、これら各緩衝素子４ｃ、４ｃの剛性が高くなり過ぎ、制振効果が低くなる。反対に、上記割合が大き過ぎた場合（組み付けに伴う上記各緩衝素子４ｃ、４ｃの圧縮量が小さ過ぎた場合）には、前記遮熱板１の支持剛性が低くなり過ぎるだけでなく、長期間に亙る使用によって上記各緩衝素子４ｃ、４ｃがへたった場合に、上記遮熱板１ががたつく可能性がある。尚、上述した各数値は、何れも、本発明を自動車用エンジンのエキゾーストマニホールドやターボチャージャーに付設する、軽量な遮熱板１の支持に使用した場合に就いて示している。他の用途に使用する、重量が嵩む遮熱板の支持に本発明を適用する場合には、当該遮熱板の重量等に応じて、上記数値を設計的に定める。
【００１７】
上述の様な各緩衝素子４ｃ、４ｃは、前記各凸部１０を、前記取付孔２の内周縁と前記スリーブ３の中間部外周面との間の環状隙間１３に、この取付孔２の両端開口から挿入し、上記各緩衝素子４ｃ、４ｃの凸部１０、１０の先端縁同士を、上記環状隙間１３の軸方向中央部で、突き合わせ若しくは近接対向させて、前記緩衝ユニット８を構成している。上記各凸部１０、１０の自由状態での高さ寸法Ｈ₁₀が前記遮熱板１の厚さ寸法Ｔ₁ の半分を越えている場合でも、上記各凸部１０、１０が弾性変形する為、特に問題を生じる事はない。
【００１８】
上述の様にして上記取付孔２の内側に、上記緩衝ユニット８を介して支持された上記スリーブ３には、ボルト、スタッド等の、図示しない結合部材を挿通し、この結合部材と、上記エキゾーストマニホールド或はターボチャージャーに設けた取付部に形成したねじ孔或はナットとを螺合し、更に緊締する。この状態で上記スリーブ３が、上記取付部の外端面とボルトの頭部或はナットとの間で強く挟持されて、この取付部に固定される。同時に、上記緩衝ユニット８を構成する上記各緩衝素子４ｃ、４ｃが、上記遮熱板１の表裏両面と前記各ワッシャ５、５との間で弾性的に圧縮されて、この遮熱板１が上記取付部に、緩衝的に支持される。尚、上記スリーブ３が、上記取付部の外端面とボルトの頭部或はナットとの間で突っ張る為、上記螺合・緊締作業に伴って、上記各緩衝素子４ｃ、４ｃが過度に圧縮される事はない。
【００１９】
上述の様に構成する本発明の遮熱板用支持装置によれば、上記遮熱板１に形成した取付孔２の内周縁と上記スリーブ３の中間部外周面との間の環状隙間１３内に、上記緩衝ユニット８を構成する１対の緩衝素子４ｃ、４ｃにそれぞれ設けた凸部１０、１０が存在する。これら各凸部１０、１０も、これら各緩衝素子４ｃ、４ｃの他の部分と同様、内部に多くの微小隙間を有し弾性変形自在である。この為、上記各凸部１０、１０が、上記取付孔２の内周縁と上記スリーブ３の中間部外周面とが直接当接する事を防止し、びびり音の発生防止を確実に図れる。
【００２０】
又、上記各緩衝素子４ｃ、４ｃとして、同一形状のものを使用するので、製造、部品管理の簡略化によるコスト低減を図れる。しかも、上記各凸部１０、１０の高さ寸法Ｈ₁₀は限られたもので、上記各緩衝素子４ｃ、４ｃに、軸方向に長く、しかも直径方向に関する厚さ寸法が小さい部分が存在しない。この為、上記各緩衝素子４ｃ、４ｃの密度を、上記各凸部１０、１０部分を含め、全体に亙って所望値通りに、しかも均一に加工する作業を容易に行なえる。
【００２１】
更に、組立時には、軸方向寸法が小さい上記凸部１０を、上記取付孔２の内周縁と上記スリーブ３の中間部外周面との間の環状隙間１３に挿入するのみで良い。前述の図４に示した従来構造の様に、剛性が低くしかも軸方向に長い小径部７を他の緩衝素子４ａの内側に挿入する様な作業は不要である。この為、組立作業が容易で、組立作業の能率化の面からもコスト低減を図れる。尚、図１に示す様に、遮熱板１に、スリーブ３並びにそれぞれ１対ずつの緩衝素子４ｃ、４ｃ及びワッシャ５、５を装着した状態で、上記スリーブ３の両端外周縁部（図１のα、β部）を直径方向外方にかしめ広げ、このスリーブ３と上記各ワッシャ５、５とが分離するのを防止しておく。この様に構成する事により、上記遮熱板１と、上記スリーブ３、緩衝素子４ｃ、４ｃ、ワッシャ５、５とを一体的に取り扱える様になって、上記遮熱板１の取り扱い性及び組み付け性の向上を図れる。
【００２２】
【発明の効果】
本発明によれば、振動音を発生する事なくしかも安定した性能を発揮できる遮熱板用支持装置を、低コストで実現できる。
【図面の簡単な説明】
【図１】本発明の実施の形態の１例を示す、図２の拡大Ａ−Ａ断面に相当する図。
【図２】遮熱板の１例を示す斜視図。
【図３】従来構造の第１例を示す、図１と同様の図。
【図４】同第２例を示す、図１と同様の図。
【符号の説明】
１遮熱板
２取付孔
３スリーブ
４、４ａ、４ｂ、４ｃ緩衝素子
５ワッシャ
６大径部
７小径部
８緩衝ユニット
９主部
１０凸部
１１凹部
１２円筒部
１３環状隙間[0001]
BACKGROUND OF THE INVENTION
The support device for a heat shield according to the present invention relates to an improvement in the structure of a portion that supports a heat shield installed in a state of covering a portion that becomes hot during operation, such as an exhaust manifold, a turbocharger, etc., by vibration transmitted during operation, This prevents the generation of annoying noises.
[0002]
[Prior art]
In order to guide the exhaust of an automobile engine, the temperature of the exhaust manifold having the upstream end connected to the side surface of the cylinder head of the engine rises considerably due to the heat of the exhaust flowing inside. In order to protect other equipment installed in the engine room from the radiant heat radiated from the exhaust manifold whose temperature has increased in this way, the exhaust manifold is covered with a heat shield plate called a heat insulator, and the exhaust manifold is Radiant heat is prevented from being transmitted to the other devices. The same applies to the turbocharger for supercharging the engine.
[0003]
FIG. 2 shows an example of such a heat shield plate 1. The heat shield plate 1 can cover the exhaust manifold with a slight gap interposed therebetween by pressing a single plate of a steel plate or a composite plate in which a sound absorbing material is sandwiched with a steel plate subjected to aluminum plating. It is formed in various shapes and sizes. Such a heat shield plate 1 is supported and fixed to a mounting portion such as a mounting seat provided in the exhaust manifold by a coupling member such as a bolt or a stud inserted into circular mounting holes 2 and 2 provided at a plurality of locations. Yes.
[0004]
Since this exhaust manifold radiates sound coming out of the engine during operation of the engine, the heat shield plate 1 vibrates on the basis of the radiated sound and does not generate harsh noise. And a buffer member is provided between the coupling member and the coupling member. FIG. 3 shows a first example of a conventional structure of a heat shield supporting device for supporting and fixing the heat shield 1 to the mounting portion. In the structure of this first example, a cylindrical sleeve 3 is inserted into the inside of a mounting hole 2 formed in a plurality of locations on the heat shield plate 1 and each having a circular shape. In addition, a pair of buffer elements 4 and 4 constituting a buffer unit are disposed around the mounting hole 2 in a state where the heat shield plate 1 is sandwiched from both the front and back surfaces. Each of the buffer elements 4 and 4 is formed into an annular shape with a rectangular cross section by further press-molding a material formed by braiding a filament made of a heat-resistant material having elasticity, such as stainless steel. In addition, washers 5 and 5 each having an L-shaped cross section and having an annular shape as a whole are superposed on outer end surfaces (side surfaces opposite to the heat shield plate 1) of both the buffer elements 4 and 4. In the case of the first example of the conventional structure shown in FIG. 3, the inner diameters of the buffer elements 4 and 4 are larger than the inner diameter of the mounting hole 2, and the inner diameters of the washers 5 and 5 are the mounting holes. Smaller than the inner diameter of 2.
[0005]
In order to support and fix the heat shield plate 1 to the mounting portion by the heat shield plate support device of the first example of the conventional structure formed by combining the above-described members, bolts, studs, etc. are not shown. The coupling member is inserted into the sleeve 3, and the coupling member and a screw hole formed in the mounting portion (when the coupling member is a bolt) or a nut (the coupling member has its proximal end fixed to the mounting portion). Then, tighten the screw (if it is a stud). In this state, the sleeve 3 is firmly clamped between the outer end surface of the mounting portion and the head or nut of the bolt, and is fixed to the mounting portion. At the same time, the buffer elements 4 and 4 are elastically compressed between the front and back surfaces of the heat shield plate 1 and the washers 5 and 5, and the heat shield plate 1 is cushioned to the mounting portion. Supported by
[0006]
FIG. 4 shows a second example of a conventional structure of a heat shield supporting device for supporting and fixing the heat shield 1 to the mounting portion. In the structure of the second example, a pair of buffer elements 4a and 4b having different shapes are arranged around a cylindrical sleeve 3 inserted into the inside of the mounting hole 2 formed in the heat shield plate 1, and the buffer It constitutes a unit. As in the case of the first example described above, one of the cushioning elements 4a, 4b (upper part of FIG. 4) formed by further press-molding a material formed by braiding a filament made of a heat-resistant material having elasticity. The buffer element 4a has a simple cross-sectional rectangle and is formed in an annular shape as a whole. On the other hand, the other buffer element 4b (lower side in FIG. 4) is composed of a large diameter portion 6 and a small diameter portion 7, and has a substantially L-shaped cross-sectional shape and is formed into a short cylindrical shape as a whole. Yes. Then, in a state where the one buffer element 4a is externally fitted to the small diameter portion 7 of the other buffer element 4b, the one heat shield plate 1 is interposed between the one buffer element 4a and the large diameter portion 6. The peripheral portion of the mounting hole 2 is sandwiched by the portion.
[0007]
In order to support and fix the heat shield plate 1 to the mounting portion by the heat shield plate support device of the second example of the conventional structure formed by combining the above-described members, bolts, studs, etc. are not shown. The coupling member is inserted into the sleeve 3 that is inserted into the inner diameter side of the other buffer member 4b, and the coupling member and a screw hole or nut formed in the mounting portion are screwed together and further tightened. In this state, the sleeve 3 is fixed to the attachment portion, and at the same time, the buffer elements 4a and 4b are elastically compressed between the front and back surfaces of the heat shield 1 and the head or nut of the bolt. Then, the heat shield plate 1 is supported by the mounting portion in a cushioning manner.
[0008]
[Problems to be solved by the invention]
In the case of the first example of the conventional structure shown in FIG. 3, the inner peripheral edge of the mounting hole 2 and the intermediate part outer peripheral surface of the sleeve 3 face each other directly without the cushioning material 4 interposed therebetween. For this reason, the heat shield 1 can be displaced in the diameter direction of the sleeve 3 due to the vibration generated during the operation of the engine, and the outer peripheral surface of the intermediate portion of the sleeve 3 can be brought into contact with the inner peripheral edge of the mounting hole 2. There is sex. When vibration is applied while the outer peripheral surface of the intermediate portion of the sleeve 3 and the inner peripheral edge of the mounting hole 2 formed in the heat shield plate 1 are in contact with each other, each of which is a metal rigid body, chatter noise is generated at the contact portion. This is undesirable because it causes discomfort to the passengers and those around.
[0009]
In the case of the second example of the conventional structure shown in FIG. 4, the small diameter portion 7 of the other cushioning material 4 b exists between the inner peripheral edge of the mounting hole 2 and the intermediate portion outer peripheral surface of the sleeve 3. Instead of preventing chatter noise, the cost is high and it is difficult to obtain stable performance. That is, in the case of the structure of the second example, since two types of cushioning materials 4a and 4b are used, manufacturing and component management become troublesome, which causes an increase in cost. Moreover, it is difficult to insert the small-diameter portion 7 of the other cushioning material 4b, which is soft and easily deformed, into the inner diameter side of the other cushioning material 4a, which deteriorates the efficiency of the assembly work and also causes an increase in cost. . Furthermore, it is difficult to make the density of the small-diameter portion 7 that is long in the axial direction (vertical direction in FIG. 4) and has a small thickness dimension in the diametric direction uniform and as desired, and the shape-retaining property of the small-diameter portion 7 is poor. Because it is easy to become, it is difficult to exhibit the desired performance.
The heat shield support device of the present invention was invented to eliminate any of the above disadvantages.
[0010]
[Means for Solving the Problems]
The heat shield plate support device of the present invention, like the conventionally known heat shield plate support device, has a cylindrical sleeve inside the circular mounting hole formed in the heat shield plate and is elastic. The heat shield plate is bufferedly supported on the mounting portion by a coupling member that is supported through a buffer unit and has a sleeve inserted through the sleeve.
In particular, in the heat shield support device of the present invention, the buffer unit is sandwiched from both sides in the axial direction by a pair of washers that are fitted around both ends of the sleeve. A cylindrical portion is provided on the inner peripheral edge portion, and is fitted on the sleeve in a state where the cylindrical portions are opposed to each other. Further, in the above-described buffer unit, a pair of buffer elements each having an annular shape and the same shape, each of which is formed by press-molding a material formed by braiding a filament made of a heat-resistant material , are arranged symmetrically with respect to the axial direction. It is a combination of states. In addition, each of the cushioning elements is formed with a convex portion at the inner peripheral edge portion of the surface facing each other, the height dimension of which is smaller than the thickness dimension of the heat shield plate and which can enter the mounting hole. In addition, a recess is formed on the inner peripheral edge of the opposite surfaces . And each said buffer element inserts each these convex part in the annular clearance between the inner periphery of the said attachment hole, and the intermediate part outer peripheral surface of the said sleeve from both ends opening of this attachment hole , The buffer unit is configured in a state where the cylindrical portion of each of the washers is entered and the outer peripheral edge portions of both ends of the sleeve are squeezed outward in the diametrical direction to prevent separation of the sleeve and the washers. ing.
[0011]
[Action]
According to the support device for a heat shield plate of the present invention configured as described above, a pair of buffer units is formed between the inner peripheral edge of the mounting hole formed in the heat shield plate and the outer peripheral surface of the intermediate portion of the sleeve. Since there are convex portions respectively provided on the buffer elements, it is possible to prevent the inner peripheral edge of the mounting hole and the outer peripheral surface of the intermediate portion of the sleeve from coming into direct contact with each other, thereby reliably preventing chatter noise. In addition, since each of the buffer elements having the same shape is used, it is possible to reduce the cost by simplifying manufacturing and component management. Moreover, since each of the buffer elements does not have a portion that is long in the axial direction and has a small thickness dimension in the diametrical direction, it is easy to work on the density of each of the buffer elements as desired and uniformly. Yes. Also, when assembling, the convex portion having a small axial dimension may be inserted into the annular clearance between the inner peripheral edge of the mounting hole and the outer peripheral surface of the intermediate portion of the sleeve. The cost can be reduced by improving the efficiency of the system. Further, since the sleeve and each washer are prevented from being separated, the heat shield plate, the sleeve, the buffer elements, and the washers can be handled in an integrated manner. Improved handling and assembly.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an example of an embodiment of the present invention. A cylindrical sleeve 3 made of metal such as steel or stainless steel is supported inside a circular mounting hole 2 formed in the heat shield plate 1 via a buffer unit 8 made of heat resistant material having elasticity. The heat shield plate 1 is buffered and supported by a mounting portion provided at a high temperature portion during operation, such as an exhaust manifold, by a coupling member (not shown) such as a bolt or a stud inserted through the sleeve 3. The buffer unit 8 is sandwiched from both sides in the axial direction (vertical direction in FIG. 1) by washers 5 and 5 each having an L-shaped cross section and having an annular shape as a whole. The inner diameter of the cylindrical portion 12 formed on the inner peripheral edge portions of both washers 5 and 5 is set to a size that allows the sleeve 3 to be loosely fitted, and the outer diameter is also made smaller than the inner diameter of the mounting hole 2. ing.
[0013]
The buffer unit 8 is formed by combining a pair of buffer elements 4c and 4c, each having an annular shape and the same shape, arranged symmetrically with respect to the axial direction (vertical direction in FIG. 1). Each of the buffer elements 4c and 4c has an annular convex portion 10 formed on a surface facing each other and an annular concave portion 11 formed on the opposite surface of the inner peripheral edge of the main portion 9 having a rectangular cross section. It consists of Height H ₁₀ in the free state of the projecting portion 10 of this, the barrier smaller than the thickness T ₁ of the hot plate 1, preferably more than half of the thickness T _₁ (T _1/2 ≦ H ₁₀ <T ₁ ). However, the long convex portion 10 than enters ensure the mounting hole 2, the height H ₁₀ in the free state of the convex portion 10, halves necessarily the thickness T ₁ of the above heat shield 1 There is no need for more. For example, the larger the thickness T ₁ of the this heat shield plate 1, 1/3 or more of the thickness _{_{_{T 1 (H 10 ≧ T 1}}} /3) in some cases be secured enough. On the other hand, the concave portion 11 is sized such that the cylindrical portion 12 formed on the inner peripheral edge of each of the washers 5 and 5 can be inserted. In addition, although the said recessed part 11 needs to be formed over the perimeter to accommodate this cylindrical part 12, the said convex part 10 does not necessarily need to be formed over a perimeter. You may form intermittently in the circumferential direction several places.
[0014]
Further, each of the buffer elements 4c and 4c as described above is formed by press-molding a material formed by braiding a stainless steel filament having an outer diameter of 0.08 to 0.20 mm, preferably 0.10 to 0.15 mm. The apparent bulk density is 0.12 to 0.20, preferably 0.14 to 0.18. If the outer diameter of the filament is less than 0.08 mm, the rigidity of the filament becomes too low, making it difficult to obtain the elasticity required for the buffer elements 4c and 4c, which is sufficient for a long period of time. It becomes difficult to maintain the vibration control effect. On the other hand, when the outer diameter of the filament exceeds 0.20 mm, the rigidity of the filament becomes too high, the rigidity of the buffer elements 4c and 4c becomes too high, and the damping effect becomes low. If the outer diameter is restricted to 0.08 to 0.20 mm, preferably 0.10 to 0.15 mm, a sufficient damping effect can be obtained from the initial stage until a long time has elapsed.
[0015]
Further, when the apparent bulk density is less than 0.12, the porosity is too high, and deformation is caused by extremely light force, and it is difficult to obtain the elasticity required for each of the buffer elements 4c and 4c. This makes it difficult to maintain a sufficient damping effect over a long period of time. On the other hand, when the apparent bulk density exceeds 0.20, the porosity is too low and the force required for deformation becomes large, the rigidity of each of the buffer elements 4c and 4c becomes too high, and the control is limited. The vibration effect is reduced. If the apparent bulk density is regulated to 0.12 to 0.20, preferably 0.14 to 0.18, a sufficient vibration damping effect can be obtained from the initial stage until a long time has elapsed. Further, the thickness T _4c of the buffer elements 4c and 4c excluding the convex portions 10 and 10 is 2 to 5 mm, preferably 3 to 4 mm in the assembled state as shown in FIG. If the thickness T _4c is too small, the rigidity becomes too high, and if it is too large, the rigidity becomes too low. In any case, it is difficult to obtain a sufficient damping effect over a long period of time. .
[0016]
The ratio of the thickness T _4c in the assembled state to the thickness in the free state is about 0.85 to 0.95. When this ratio is too small (when the compression amount of each of the buffer elements 4c and 4c associated with the assembly is too large), the rigidity of each of the buffer elements 4c and 4c becomes too high, and the vibration damping effect becomes low. . On the other hand, when the ratio is too large (when the amount of compression of the buffer elements 4c and 4c associated with the assembly is too small), not only the support rigidity of the heat shield plate 1 becomes too low, but also the long When the buffer elements 4c and 4c are slackened due to use over a period, the heat shield plate 1 may be rattled. Each of the numerical values described above is shown when the present invention is used to support a lightweight heat shield plate 1 attached to an exhaust manifold or a turbocharger of an automobile engine. When the present invention is applied to support a heat shield plate that is used for other purposes and is heavy, the above numerical values are determined by design according to the weight of the heat shield plate.
[0017]
Each of the buffer elements 4c and 4c as described above is configured so that each of the convex portions 10 is connected to the annular gap 13 between the inner peripheral edge of the mounting hole 2 and the outer peripheral surface of the intermediate portion of the sleeve 3 at both ends of the mounting hole 2. The buffer unit 8 is configured by inserting from the opening and causing the tip edges of the convex portions 10 and 10 of the buffer elements 4c and 4c to abut or face each other at the axial center of the annular gap 13. Yes. Even if the height H ₁₀ in a free state of the respective convex portions 10 and 10 exceeds the half of the thickness T ₁ of the hot plate 1 shielding the order in which the respective convex portions 10 and 10 elastically deforms There is no particular problem.
[0018]
A coupling member (not shown) such as a bolt or a stud is inserted into the sleeve 3 supported via the buffer unit 8 inside the mounting hole 2 as described above, and the coupling member and the exhaust are inserted. A screw hole or a nut formed in a mounting portion provided in the manifold or turbocharger is screwed and further tightened. In this state, the sleeve 3 is firmly clamped between the outer end surface of the mounting portion and the head or nut of the bolt, and is fixed to the mounting portion. At the same time, the buffer elements 4c and 4c constituting the buffer unit 8 are elastically compressed between the front and back surfaces of the heat shield plate 1 and the washers 5 and 5, so that the heat shield plate 1 is The mounting portion is supported in a cushioning manner. Since the sleeve 3 is stretched between the outer end surface of the mounting portion and the head or nut of the bolt, the buffer elements 4c and 4c are excessively compressed along with the screwing and tightening operations. There is nothing to do.
[0019]
According to the support device for a heat shield plate of the present invention configured as described above, in the annular gap 13 between the inner peripheral edge of the mounting hole 2 formed in the heat shield plate 1 and the outer peripheral surface of the intermediate portion of the sleeve 3. In addition, there are convex portions 10, 10 provided on the pair of buffer elements 4 c, 4 c constituting the buffer unit 8, respectively. Each of the convex portions 10 and 10 is also elastically deformable with many minute gaps in the inside, like the other portions of the buffer elements 4c and 4c. For this reason, the convex portions 10 and 10 can prevent the inner peripheral edge of the mounting hole 2 from directly contacting the outer peripheral surface of the intermediate portion of the sleeve 3, and can reliably prevent chatter noise.
[0020]
In addition, since the same shape is used as each of the buffer elements 4c and 4c, the cost can be reduced by simplifying the manufacturing and component management. In addition, the height dimension H10 of each of the protrusions 10 and ₁₀ is limited, and the buffer elements 4c and 4c do not have a portion that is long in the axial direction and has a small thickness dimension in the diameter direction. For this reason, the work of processing the density of each of the buffer elements 4c and 4c in a desired value and uniformly over the entire surface including the protrusions 10 and 10 can be easily performed.
[0021]
Furthermore, at the time of assembling, it is only necessary to insert the convex portion 10 having a small axial dimension into the annular gap 13 between the inner peripheral edge of the mounting hole 2 and the outer peripheral surface of the intermediate portion of the sleeve 3. As in the conventional structure shown in FIG. 4 described above, it is not necessary to insert a small diameter portion 7 having low rigidity and long in the axial direction inside the other buffer element 4a. Therefore, the assembling work is easy and the cost can be reduced from the viewpoint of improving the efficiency of the assembling work. As shown in FIG. 1, the sleeve 3 and a pair of cushioning elements 4c, 4c and washers 5, 5 are mounted on the heat shield plate 1, and the outer peripheral edge portions of both ends of the sleeve 3 (FIG. 1). (Α and β portions) are squeezed outward in the diameter direction to prevent the sleeve 3 and the washers 5 and 5 from separating . With this configuration, the heat shield plate 1, the sleeve 3, the buffer elements 4c, 4c, and the washers 5, 5 can be handled integrally, and the heat shield plate 1 can be handled and assembled. Can improve the performance.
[0022]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the support apparatus for heat shields which can exhibit the stable performance without generating a vibration sound is realizable at low cost.
[Brief description of the drawings]
FIG. 1 is a diagram corresponding to an enlarged AA cross section of FIG. 2, showing an example of an embodiment of the present invention.
FIG. 2 is a perspective view showing an example of a heat shield.
FIG. 3 is a view similar to FIG. 1, showing a first example of a conventional structure.
FIG. 4 is a view similar to FIG. 1, showing the second example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Heat-shield plate 2 Mounting hole 3 Sleeve 4, 4a, 4b, 4c Buffer element 5 Washer 6 Large diameter part 7 Small diameter part 8 Buffer unit 9 Main part 10 Convex part 11 Concave part 12 Cylindrical part 13 Annular gap

Claims

A cylindrical sleeve is supported inside a circular mounting hole formed in the heat shield plate via an elastic buffer unit, and the heat shield plate is buffered to the mounting portion by a coupling member inserted through the sleeve. In the supporting device for the heat shield plate to be supported, the buffer unit is sandwiched from both sides in the axial direction by a pair of washers fitted to both ends of the sleeve, and each of the washers is attached to each inner peripheral edge. A cylindrical portion is provided, and each cylindrical portion is externally fitted to the sleeve in a state of being opposed to each other, and the buffer unit further includes a material formed by braiding filaments made of heat-resistant materials. formed by molding under pressure, are those formed by combining in a state of being arranged symmetrically with respect to the axial direction of a pair of buffer elements having the same shape with the annular, each of these buffer elements are opposed to each other face The inner peripheral edge portion, the recess and the height dimension smaller than the thickness of the heat shield plate, and thereby forming a freely protruding portion enters inside of the mounting hole, the inner peripheral edge portion of the opposite face to each other is obtained by forming, each buffer element, the respective convex portions in the annular gap between the intermediate portion outer peripheral surface of the inner peripheral edge and the sleeve of the mounting hole, is inserted from the openings at both ends of the mounting hole The cylindrical portions of the washers are inserted into the recesses, and the outer peripheral edge portions of the sleeves are squeezed outward in the diametrical direction, and the sleeve and the washers are prevented from being separated in the state described above. A heat shield supporting device, characterized in that it constitutes a buffer unit.