JP4459477B2

JP4459477B2 - Wiper arm arm head, wiper arm and vehicle wiper

Info

Publication number: JP4459477B2
Application number: JP2001149116A
Authority: JP
Inventors: 秀基白鳥
Original assignee: Asmo Co Ltd
Current assignee: Asmo Co Ltd
Priority date: 2001-05-18
Filing date: 2001-05-18
Publication date: 2010-04-28
Anticipated expiration: 2021-05-18
Also published as: JP2002337669A

Description

【０００１】
【発明の属する技術分野】
本発明は、ピボット軸との連結部分の剛性を向上すべく金属製のインサート部材をインサートして樹脂成形されるワイパアームのアームヘッド、該アームヘッドを用いたワイパアーム及び車両用ワイパに関するものである。
【０００２】
【従来の技術】
近年、自動車の例えばリアガラス表面を払拭するワイパアームには、樹脂にて構成されたものが種々提案されている。このようなワイパアームは、図６、図８及び図９に示すように、ピボット軸２１に対して一体回転可能に組み付けられるアームヘッド２２と、該アームヘッド２２に対して基端部が所定角度傾動可能に連結されるアーム（図示略）とを備え、ともに樹脂成形により所定形状に形成されている。アームの先端部には、ガラス表面を払拭するワイパブレード（図示略）が連結される。そして、ピボット軸２１はワイパモータ（図示略）の駆動により所定角度範囲で往復回動され、そのピボット軸２１の回動によりワイパアームの所定の払拭動作が行われるようになっている。
【０００３】
アームヘッド２２には、図６に示すように、ピボット軸２１との連結部分において剛性を向上すべく金属製のインサート部材２３がインサート成形されている。このインサート部材２３は、図７〜図９に示すように、中央部にピボット軸２１と一体回転可能に連結するための連結孔２４ａを有するリング状の筒部２４と、該筒部２４の外周面において周方向に等間隔に形成される４つの係合突起２５とを備えている。係合突起２５は樹脂部２６と周方向に交互に配置され、インサート部材２３と樹脂部２６とが一体物をなしている。
【０００４】
【発明が解決しようとする課題】
ところで、例えば冬季にリアガラスに雪が積もった状態でワイパアームを無理に駆動（回動）させた場合等、該ワイパアームには回転方向に過大な荷重がかかる。すると、アームヘッド２２においても同方向（図９において矢印Ａ方向）に過大な荷重がかかり、インサート部材２３の係合突起２５の周方向端面２５ａとその端面２５ａに当接する樹脂部２６との間にその荷重が作用する。図９に示すように、従来のインサート部材２３は、係合突起２５の周方向両端面２５ａが互いに略平行となっている（係合突起２５の周方向端面２５ａと、該端面２５ａにおける接線Ｊ０とのなす角θ０が９０°より大きな鈍角となっている）。そのため、アームヘッド２２に対して回転方向に過大な荷重がかかると、係合突起２５の周方向端面２５ａにその荷重が作用し、その荷重の一部が端面２５ａで樹脂部２６を径方向外側に剥離させる力Ｆ（例えばアームヘッド２２が反時計回り方向に回動した場合）に変わる。すると、この径方向外側に剥離させる力Ｆにより樹脂部２６に割れが生じ、アームヘッド２２が破損する場合があった。
【０００５】
又、係合突起２５は、連結孔２４ａの軸方向から見て該突起２５の同心円上の面積Ｓ０が樹脂部２６のそれよりも小さく、しかも軸方向の長さＤ４が図８に示すように樹脂部２６の軸方向の長さＤ５，Ｄ６より長い。そのため、軸方向において、係合突起２５の樹脂部２６との当接面積Ｓ０が小さく、しかも係合突起２５を挟む部分の樹脂部２６の厚みが薄く該樹脂部２６の剛性が低い。そのため、アームヘッド２２に対して回転平面（ピボット軸２１の軸線を法線とする平面）から傾いた方向（図８において例えば矢印Ｂ方向）に大きな荷重がかかる場合、樹脂部２６に割れが生じ、アームヘッド２２が破損する場合があった。
【０００６】
本発明は、上記問題点を解決するためになされたものであって、その目的は、金属製のインサート部材をインサートして樹脂成形されるワイパアームのアームヘッドであって、そのインサート部材と樹脂部との間の破損強度を向上することができるワイパアームのアームヘッド、該アームヘッドを用いたワイパアーム及び車両用ワイパを提供することにある。
【０００７】
【課題を解決するための手段】
上記問題点を解決するため、請求項１に記載の発明は、車両のガラス表面を払拭するためのワイパブレードを保持するワイパアームの一部を構成し、回転駆動されるピボット軸と一体回転可能に連結する連結孔を有する金属製のインサート部材をインサートして樹脂成形されるワイパアームのアームヘッドであって、前記インサート部材は、筒部を有し、該筒部の周方向において略等間隔に該筒部の外周面から外側に延出しアームヘッドの樹脂部に食い込む複数の係合突起を有し、その係合突起は、周方向の端面において前記連結孔の中心から放射状に延びる直線に対し外側部分が内側部分よりも隣接する突起側に突出するように略直線状に形成されている。
【０００８】
請求項２に記載の発明は、車両のガラス表面を払拭するためのワイパブレードを保持するワイパアームの一部を構成し、回転駆動されるピボット軸と一体回転可能に連結する連結孔を有する金属製のインサート部材をインサートして樹脂成形されるワイパアームのアームヘッドであって、前記インサート部材は、筒部を有し、該筒部の周方向において略等間隔に該筒部の外周面から外側に延出しアームヘッドの樹脂部に食い込む複数の係合突起を有し、その係合突起は、前記連結孔の軸方向から見た前記筒部周りの面積が、前記軸方向から見た該突起間の樹脂部の面積以上となるように形成されているとともに、該突起の軸方向の長さが、該突起を挟む樹脂部の軸方向一側の長さ及び同方向他側の長さよりも短く形成されている。
【０００９】
請求項３に記載の発明は、車両のガラス表面を払拭するためのワイパブレードを保持するワイパアームの一部を構成し、回転駆動されるピボット軸と一体回転可能に連結する連結孔を有する金属製のインサート部材をインサートして樹脂成形されるワイパアームのアームヘッドであって、前記インサート部材は、筒部を有し、該筒部の周方向において略等間隔に該筒部の外周面から外側に延出しアームヘッドの樹脂部に食い込む複数の係合突起を有し、その係合突起は、周方向の端面において前記連結孔の中心から放射状に延びる直線に対し外側部分と内側部分とがともにその直線上となるように、又は外側部分が内側部分よりも隣接する突起側に突出するように略直線状に形成され、かつ、前記連結孔の軸方向から見た前記筒部周りの面積が、前記軸方向から見た該突起間の樹脂部の面積以上となるように形成されているとともに、該突起の軸方向の長さが、該突起を挟む樹脂部の軸方向一側の長さ及び同方向他側の長さよりも短く形成されている。
【００１０】
請求項４に記載の発明は、請求項２又は３に記載のワイパアームのアームヘッドにおいて、前記係合突起は、前記筒部周りにおいて、前記連結孔の軸方向から見た該突起の前記面積の合計が、前記軸方向から見た該突起間の樹脂部の面積の合計以上となるように形成されている。
【００１１】
請求項５に記載の発明は、請求項１〜４のいずれか１項に記載のワイパアームのアームヘッドにおいて、前記係合突起は前記筒部の軸方向の略中央位置に配置され、前記係合突起を挟む樹脂部の軸方向一側の長さと、同方向他側の長さとが略等しくなるように形成されている。
【００１２】
請求項６に記載の発明は、請求項１〜５のいずれか１項に記載のアームヘッドを用いたワイパアームである。
請求項７に記載の発明は、請求項１〜５のいずれか１項に記載のアームヘッドを有するワイパアームと、該ワイパアームの先端部に連結され車両のガラス表面を払拭するためのワイパブレードとを備えた車両用ワイパである。
【００１３】
（作用）
請求項１に記載の発明によれば、アームヘッドにインサートされるインサート部材の係合突起は、周方向の端面において連結孔の中心から放射状に延びる直線に対し外側部分が内側部分よりも隣接する突起側に突出するように略直線状に形成される（係合突起の周方向端面と、該端面における接線とのなす角が９０°より小さな鋭角となっている）。そのため、アームヘッドに対して回転方向に過大な荷重がかかると、係合突起の周方向端面とその端面に当接する樹脂部との間にその荷重が作用するが、該端面の形状から径方向外側に向かう力（剥離方向の力）の発生を防止でき、インサート部材と樹脂部との間の回転方向の破損強度が向上する。従って、アームヘッドに対して回転方向に大きな荷重がかかっても、樹脂部の割れが防止される。
【００１４】
請求項２に記載の発明によれば、アームヘッドにインサートされるインサート部材の係合突起は、連結孔の軸方向から見た筒部周りの面積が、軸方向から見た該突起間の樹脂部の面積以上となるように形成されるとともに、該突起の軸方向の長さが、該突起を挟む樹脂部の軸方向一側の長さ及び同方向他側の長さよりも短く形成される。そのため、軸方向において、係合突起の樹脂部との当接面積が大きくなり、しかも係合突起を挟む部分の樹脂部の厚みが厚くなるので、該樹脂部の剛性が高くなり、インサート部材と樹脂部との間の軸方向の破損強度が向上する。従って、アームヘッドに対して回転平面から傾いた方向に大きな荷重がかかっても、樹脂部の割れが防止される。
【００１５】
請求項３に記載の発明によれば、アームヘッドにインサートされるインサート部材の係合突起は、周方向の端面において連結孔の中心から放射状に延びる直線に対し外側部分と内側部分とがともにその直線上となるように、又は外側部分が内側部分よりも隣接する突起側に突出するように略直線状に形成される（係合突起の周方向端面と、該端面における接線とのなす角が９０°、又は９０°より小さな鋭角となっている）。そのため、アームヘッドに対して回転方向に過大な荷重がかかると、係合突起の周方向端面とその端面に当接する樹脂部との間にその荷重が作用するが、該端面の形状から径方向外側に向かう力（剥離方向の力）の発生を防止でき、インサート部材と樹脂部との間の回転方向の破損強度が向上する。従って、アームヘッドに対して回転方向に大きな荷重がかかっても、樹脂部の割れが防止される。しかも、該係合突起は、連結孔の軸方向から見た前記筒部周りの面積が、前記軸方向から見た該突起間の樹脂部の面積以上となるように形成されるとともに、該突起の軸方向の長さが、該突起を挟む樹脂部の軸方向一側の長さ及び同方向他側の長さよりも短く形成される。そのため、軸方向において、係合突起の樹脂部との当接面積が大きくなり、しかも係合突起を挟む部分の樹脂部の厚みが厚くなるので、該樹脂部の剛性が高くなり、インサート部材と樹脂部との間の軸方向の破損強度が向上する。従って、アームヘッドに対して回転平面から傾いた方向に大きな荷重がかかっても、樹脂部の割れが防止される。
【００１６】
請求項４に記載の発明によれば、係合突起は、筒部周りにおいて連結孔の軸方向から見た該突起の面積の合計が、軸方向から見た該突起間の樹脂部の面積の合計以上となるように形成される。そのため、軸方向において係合突起の樹脂部との当接面積が大きくなるので、インサート部材と樹脂部との間の軸方向の破損強度が向上する。
【００１７】
請求項５に記載の発明によれば、係合突起は筒部の軸方向の略中央位置に配置され、係合突起を挟む樹脂部の軸方向一側の長さと、同方向他側の長さとが略等しくなるように形成される。そのため、係合突起を挟む樹脂部の両側の剛性をバランスよく確保することができる。
【００１８】
請求項６に記載の発明によれば、ワイパアームに用いられるアームヘッドは、インサート部材と樹脂部との間の破損強度が向上する。
請求項７に記載の発明によれば、車両用ワイパに用いられるアームヘッドは、インサート部材と樹脂部との間の破損強度が向上する。
【００１９】
【発明の実施の形態】
以下、本発明を具体化した一実施形態を図面に従って説明する。
図１は、自動車のリアガラス表面を払拭するリアワイパ１を示す。リアワイパ１は、ワイパアーム２とワイパブレード３とを備えている。
【００２０】
ワイパアーム２は、ピボット軸４に対して一体回転可能に組み付けられるアームヘッド５と、該アームヘッド５に対して基端部が所定角度傾動可能に連結されるアーム６とを備え、ともに樹脂成形により所定形状に形成されている。アーム６の先端部には、ガラス表面を払拭するブレードラバー７を備えた前記ワイパブレード３が連結されている。ワイパアーム２は、ピボット軸４がワイパモータ（図示略）の駆動により所定角度範囲で往復回動されることより所定の払拭動作を行うようになっている。
【００２１】
アームヘッド５には、図２に示すように、ピボット軸４との連結部分において剛性を向上すべくアルミダイカスト等の金属製のインサート部材１１がインサート成形されている。このインサート部材１１は、図３〜図５に示すように、中央部にピボット軸４と一体回転可能に連結するための連結孔１２ａを有するリング状の筒部１２と、該筒部１２の外周面から外側に略円弧状に延出し周方向に等間隔に形成される８つの係合突起１３とを備えている。この係合突起１３は、筒部１２の外周面における軸方向の略中央位置に配置されている。これら各係合突起１３は、樹脂部１４に対して食い込んだ状態になる。そのため、インサート部材１１と樹脂部１４とが互いに確実に係合し一体物をなしている。
【００２２】
又、前記係合突起１３は、本実施形態では図５に示すように、その周方向の両端面１３ａがインサート部材１１（連結孔１２ａ）の中心から放射状に延びる直線Ｌ１に沿って直線状に形成されている（係合突起１３の周方向端面１３ａと、該端面１３ａにおける接線Ｊ１，Ｊ２とのなす角θ１，θ２が９０°となっている）。そのため、アームヘッド５に対して回転方向（図５において矢印Ａ方向）に過大な荷重がかかると、係合突起１３の周方向端面１３ａとその端面１３ａに当接する樹脂部１４との間にその荷重が作用するが、該端面１３ａがインサート部材１１の中心から放射状に延びる直線Ｌ１に沿って直線状に形成されているので、径方向外側に向かう力、即ち樹脂部１４が剥離する方向の力が生じない。従って、アームヘッド５に上記のような過大な回転方向の荷重が作用しても、樹脂部１４が割れることが防止されている。
【００２３】
又、本実施形態の係合突起１３は、連結孔１２ａの軸方向から見て筒部１２周りに樹脂部１４と交互に等間隔に配置され、該突起１３の面積Ｓ１が連結孔１２ａの軸方向から見た該突起１３間の樹脂部１４の面積Ｓ２以上となっている。又、筒部１２周りの各突起１３の面積Ｓ１の合計も突起１３間の各樹脂部１４の面積Ｓ２の合計以上となっている。つまり、軸方向において、係合突起１３の樹脂部１４との当接面積Ｓ１が大きくなるように設定されている。又、係合突起１３は、図４に示すようにその軸方向の長さＤ１が樹脂部１４の軸方向一側の長さＤ２及び同方向他側の長さＤ３よりも短く設定されている。この場合、樹脂部１４の軸方向一側の長さＤ２と、同方向他側の長さＤ３とが略等しくなるようになっている。これにより、係合突起１３を挟んで軸方向両側に位置する樹脂部１４の厚みが厚く、該樹脂部１４の剛性が高くなっている。従って、アームヘッド５に対して回転平面（ピボット軸４の軸線を法線とする平面）から傾いた方向（図４において例えば矢印Ｂ方向）に大きな荷重がかかった場合であっても、樹脂部１４が割れることが防止されている。
【００２４】
このように本実施形態では、インサート部材１１の係合突起１３の形状を工夫して、アームヘッド５の回転方向及び回転平面から傾いた方向の破損強度を向上させ、樹脂よりなるアームヘッド５の破損強度が向上されている。
【００２５】
上記したように、本実施形態では、以下に示す特徴がある。
（１）アームヘッド５にインサートされるインサート部材１１の係合突起１３は、周方向の端面１３ａにおいて連結孔１２ａの中心から放射状に延びる直線Ｌ１に沿って（放射状に延びる直線Ｌ１に対し外側部分と内側部分とがともにその直線上となるように）略直線状に形成される。そのため、アームヘッド５に対して回転方向（図５において矢印Ａ方向）に過大な荷重がかかると、係合突起１３の周方向端面１３ａとその端面１３ａに当接する樹脂部１４との間にその荷重が作用するが、該端面１３ａの形状から径方向外側に向かう力（剥離方向の力）の発生を防止でき、インサート部材１１と樹脂部１４との間の回転方向の破損強度を向上することができる。従って、アームヘッド５に対して回転方向に大きな荷重がかかっても、樹脂部の割れを防止することができる。
【００２６】
（２）インサート部材１１の係合突起１３は、連結孔１２ａの軸方向から見て筒部１２周りに樹脂部１４と交互に等間隔に配置され、該突起１３の面積Ｓ１が連結孔１２ａの軸方向から見た該突起１３間の樹脂部１４の面積Ｓ２以上となっている。又、筒部１２周りの各突起１３の面積Ｓ１の合計も突起１３間の各樹脂部１４の面積Ｓ２の合計以上となっている。つまり、軸方向において、係合突起１３の樹脂部１４との当接面積Ｓ１が大きくなるように設定されている。又、係合突起１３は、図４に示すようにその軸方向の長さＤ１が樹脂部１４の軸方向一側の長さＤ２及び同方向他側の長さＤ３よりも短く設定されている。これにより、係合突起１３を挟んで軸方向両側に位置する樹脂部１４の厚みが厚く、該樹脂部１４の剛性が高くなる。従って、アームヘッド５に対して回転平面（ピボット軸４の軸線を法線とする平面）から傾いた方向（図４において例えば矢印Ｂ方向）に大きな荷重がかかった場合であっても、樹脂部１４の割れを防止することができる。
【００２７】
（３）係合突起１３は軸方向の略中央位置に配置され、該突起１３を挟む樹脂部１４の軸方向一側の長さＤ２と、同方向他側の長さＤ３とが略等しくなるように形成される。そのため、係合突起１３を挟む樹脂部１４の両側の剛性をバランスよく確保することができる。
【００２８】
尚、本発明の実施形態は、以下のように変更してもよい。
○上記実施形態では、インサート部材１１の形状はこれに限定されるものではなく、適宜変更してもよい。例えば、係合突起１３を８つ設けたがこれ以外の数であってもよい。又、係合突起１３の周方向の端面１３ａを、連結孔１２ａの中心から放射状に延びる直線Ｌ１に沿って略直線状に形成したが、該端面１３ａの外側部分が内側部分よりも隣接する突起１３側に突出するように略直線状に形成してもよい（係合突起１３の周方向端面１３ａと、該端面１３ａにおける接線Ｊ１，Ｊ２とのなす角θ１，θ２が９０°より小さな鋭角としてもよい）。この場合、アームヘッドに対して回転方向に過大な荷重がかかると、係合突起の周方向端面とその端面に当接する樹脂部との間にその荷重が作用するが、該端面の形状からその荷重の一部が径方向内側に向かう力、即ち樹脂部１４が剥離する方向と反対方向の力に変わる。そのため、この力が生じても樹脂部が割れることはない。又、インサート部材１１をアルミダイカスト以外の金属材料で構成してもよい。
【００２９】
○上記実施形態では、アームヘッド５等、リアワイパ１の形状及び構成はこれに限定されるものではなく、適宜変更してもよい。
○上記実施形態では、自動車のリアガラスを払拭するワイパ１に実施したが、リアガラス以外のガラス、例えばウインドシールドガラス（フロントガラス）を払拭するワイパに実施してもよい。
【００３０】
【発明の効果】
以上詳述したように、本発明によれば、金属製のインサート部材をインサートして樹脂成形されるワイパアームのアームヘッドであって、そのインサート部材と樹脂部との間の破損強度を向上することができるワイパアームのアームヘッド、該アームヘッドを用いたワイパアーム及び車両用ワイパを提供することができる。
【図面の簡単な説明】
【図１】本実施形態の車両用ワイパの斜視図である。
【図２】アームヘッドの斜視図である。
【図３】インサート部材の斜視図である。
【図４】アームヘッドの縦断面図である。
【図５】アームヘッドの横断面図である。
【図６】従来のアームヘッドの斜視図である。
【図７】インサート部材の斜視図である。
【図８】アームヘッドの縦断面図である。
【図９】アームヘッドの横断面図である。
【符号の説明】
２…ワイパアーム、３…ワイパブレード、４…ピボット軸、５…アームヘッド、１１…インサート部材、１２…筒部、１２ａ…連結孔、１３…係合突起、１４…樹脂部、Ｄ１〜Ｄ３…長さ、Ｌ１…直線、Ｓ１，Ｓ２…面積。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an arm head of a wiper arm that is resin-molded by inserting a metal insert member in order to improve the rigidity of a connecting portion with a pivot shaft, a wiper arm using the arm head, and a vehicle wiper.
[0002]
[Prior art]
In recent years, various types of wiper arms for wiping, for example, a rear glass surface of an automobile have been proposed. As shown in FIGS. 6, 8, and 9, such a wiper arm has an arm head 22 that is assembled so as to be integrally rotatable with respect to the pivot shaft 21, and a base end portion tilts at a predetermined angle with respect to the arm head 22. Arms (not shown) that can be coupled are provided, and both are formed into a predetermined shape by resin molding. A wiper blade (not shown) for wiping the glass surface is connected to the tip of the arm. The pivot shaft 21 is reciprocated in a predetermined angle range by driving a wiper motor (not shown), and a predetermined wiping operation of the wiper arm is performed by the rotation of the pivot shaft 21.
[0003]
As shown in FIG. 6, a metal insert member 23 is insert-molded in the arm head 22 in order to improve rigidity at a connecting portion with the pivot shaft 21. As shown in FIGS. 7 to 9, the insert member 23 includes a ring-shaped tube portion 24 having a connection hole 24 a for connecting to the pivot shaft 21 so as to be integrally rotatable with the center portion, and an outer periphery of the tube portion 24. And four engagement protrusions 25 formed at equal intervals in the circumferential direction on the surface. The engaging protrusions 25 are alternately arranged in the circumferential direction with the resin portion 26, and the insert member 23 and the resin portion 26 are integrated.
[0004]
[Problems to be solved by the invention]
By the way, for example, when the wiper arm is forcibly driven (rotated) in the winter when snow is piled up on the rear glass, an excessive load is applied to the wiper arm in the rotational direction. Then, an excessive load is applied also in the arm head 22 in the same direction (the direction of arrow A in FIG. 9), and the gap between the circumferential end surface 25a of the engagement protrusion 25 of the insert member 23 and the resin portion 26 that abuts on the end surface 25a. The load acts on. As shown in FIG. 9, in the conventional insert member 23, both end surfaces 25a in the circumferential direction of the engaging projections 25 are substantially parallel to each other (the circumferential end surface 25a of the engaging projection 25 and the tangent line J0 at the end surface 25a. Is an obtuse angle larger than 90 °). Therefore, when an excessive load is applied to the arm head 22 in the rotational direction, the load acts on the circumferential end surface 25a of the engagement protrusion 25, and a part of the load is radially outwardly moved from the resin portion 26 by the end surface 25a. Is changed to a force F (for example, when the arm head 22 rotates counterclockwise). Then, the resin portion 26 is cracked by the force F to be peeled outward in the radial direction, and the arm head 22 may be damaged.
[0005]
Further, the engagement protrusion 25 has a concentric area S0 of the protrusion 25 smaller than that of the resin portion 26 when viewed from the axial direction of the connecting hole 24a, and an axial length D4 as shown in FIG. The length of the resin part 26 in the axial direction is longer than D5 and D6. Therefore, in the axial direction, the contact area S0 of the engaging protrusion 25 with the resin portion 26 is small, and the thickness of the resin portion 26 at the portion sandwiching the engaging protrusion 25 is thin, and the rigidity of the resin portion 26 is low. Therefore, when a large load is applied to the arm head 22 in a direction (for example, the arrow B direction in FIG. 8) inclined from the rotation plane (a plane having the axis of the pivot shaft 21 as a normal line), the resin portion 26 is cracked. The arm head 22 may be damaged.
[0006]
The present invention has been made to solve the above-described problems, and an object of the present invention is an arm head of a wiper arm that is resin-molded by inserting a metal insert member, the insert member and the resin portion. An object is to provide an arm head of a wiper arm that can improve the breaking strength between the wiper arm, a wiper arm using the arm head, and a vehicle wiper.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the invention described in claim 1 constitutes a part of a wiper arm that holds a wiper blade for wiping a glass surface of a vehicle, and can rotate integrally with a pivot shaft that is driven to rotate. An arm head of a wiper arm that is resin-molded by inserting a metal insert member having a connecting hole to be connected, wherein the insert member has a cylindrical portion, and the circumferential direction of the cylindrical portion is substantially equal to the interval. a plurality of engaging projections biting into the resin portion of the extending out arm head outward from the outer peripheral surface of the cylindrical portion, the engaging projection is Shi pairs to a straight line extending radially from the center of the coupling hole in the end face of the circumferential direction is formed in a substantially straight line so that the outer side portion projecting protrusion side adjacent than the inner portion.
[0008]
According to the second aspect of the present invention, a part of a wiper arm that holds a wiper blade for wiping a glass surface of a vehicle is formed, and a metal connection hole that is connected to a rotationally driven pivot shaft so as to be integrally rotatable is provided. The insert member is an arm head of a wiper arm that is resin-molded, and the insert member has a cylindrical portion, and is spaced outward from the outer peripheral surface of the cylindrical portion at substantially equal intervals in the circumferential direction of the cylindrical portion. There are a plurality of engaging protrusions that bite into the resin part of the extending arm head, and the engaging protrusions have an area around the cylindrical part viewed from the axial direction of the connecting hole. The length of the projection in the axial direction is shorter than the length of one side in the axial direction of the resin portion sandwiching the projection and the length of the other side in the same direction. Is formed.
[0009]
According to a third aspect of the present invention, a part of a wiper arm that holds a wiper blade for wiping a glass surface of a vehicle is formed, and a metal connection hole that is connected to a rotationally driven pivot shaft so as to be integrally rotatable is provided. The insert member is an arm head of a wiper arm that is resin-molded, and the insert member has a cylindrical portion, and is spaced outward from the outer peripheral surface of the cylindrical portion at substantially equal intervals in the circumferential direction of the cylindrical portion. There are a plurality of engaging protrusions that bite into the resin portion of the extending arm head, and the engaging protrusions have both an outer portion and an inner portion with respect to a straight line extending radially from the center of the connecting hole on the circumferential end surface. The area around the cylindrical portion as viewed from the axial direction of the connecting hole is formed in a substantially straight line so that it is on a straight line, or the outer portion protrudes toward the protrusion side adjacent to the inner portion. The axial length of the projection is one side in the axial direction of the resin portion sandwiching the projection, and the length of the projection in the axial direction is greater than the area of the resin portion between the projections as viewed from the axial direction. And it is shorter than the length of the other side in the same direction.
[0010]
According to a fourth aspect of the present invention, in the arm head of the wiper arm according to the second or third aspect, the engagement protrusion has an area of the protrusion as viewed from the axial direction of the connection hole around the cylindrical portion. The total is formed to be equal to or greater than the total area of the resin portions between the protrusions as viewed from the axial direction.
[0011]
According to a fifth aspect of the present invention, in the arm head of the wiper arm according to any one of the first to fourth aspects, the engagement protrusion is disposed at a substantially central position in the axial direction of the cylindrical portion, and the engagement The length of one side in the axial direction of the resin portion sandwiching the protrusion is formed to be substantially equal to the length of the other side in the same direction.
[0012]
The invention according to claim 6 is a wiper arm using the arm head according to any one of claims 1 to 5.
According to a seventh aspect of the invention, there is provided a wiper arm having the arm head according to any one of the first to fifth aspects, and a wiper blade connected to the tip of the wiper arm for wiping the glass surface of the vehicle. A vehicle wiper provided.
[0013]
(Function)
According to the invention described in claim 1, the engagement protrusion of the insert member which is inserted into the arm head, the center Shi pairs to a straight line extending radially from the outer portion of the coupling hole in the circumferential direction end surfaces of than the inner portion It is formed in a substantially linear shape so as to protrude to the adjacent protrusion side (the angle formed by the circumferential end surface of the engaging protrusion and the tangent line at the end surface is an acute angle smaller than 90 °). Therefore, if an excessive load is applied to the arm head in the rotational direction, the load acts between the circumferential end surface of the engagement protrusion and the resin portion that contacts the end surface. Generation | occurrence | production of the force (force | strength of a peeling direction) toward an outer side can be prevented, and the failure | damage strength of the rotation direction between an insert member and a resin part improves. Therefore, even if a large load is applied to the arm head in the rotational direction, the resin portion is prevented from cracking.
[0014]
According to the second aspect of the present invention, the engagement protrusion of the insert member inserted into the arm head has an area around the tube portion viewed from the axial direction of the connecting hole, and the resin between the protrusions viewed from the axial direction. And the length of the projection in the axial direction is shorter than the length of one side in the axial direction of the resin portion sandwiching the projection and the length of the other side in the same direction. . Therefore, in the axial direction, the contact area of the engaging protrusion with the resin portion increases, and the thickness of the resin portion at the portion sandwiching the engaging protrusion increases, so that the rigidity of the resin portion increases, and the insert member and The breaking strength in the axial direction between the resin portion is improved. Therefore, even if a large load is applied to the arm head in a direction inclined from the rotation plane, the resin portion is prevented from cracking.
[0015]
According to the third aspect of the present invention, the engaging protrusion of the insert member inserted into the arm head has both the outer portion and the inner portion with respect to a straight line extending radially from the center of the connecting hole on the circumferential end surface. It is formed in a substantially straight line shape so that it is on a straight line, or the outer part protrudes toward the protrusion side adjacent to the inner part (the angle formed by the circumferential end surface of the engaging protrusion and the tangent line at the end surface is 90 ° or an acute angle smaller than 90 °). Therefore, if an excessive load is applied to the arm head in the rotational direction, the load acts between the circumferential end surface of the engagement protrusion and the resin portion that contacts the end surface. Generation | occurrence | production of the force (force | strength of a peeling direction) toward an outer side can be prevented, and the failure | damage strength of the rotation direction between an insert member and a resin part improves. Therefore, even if a large load is applied to the arm head in the rotational direction, the resin portion is prevented from cracking. In addition, the engagement protrusion is formed so that an area around the cylindrical portion when viewed from the axial direction of the connecting hole is equal to or larger than an area of the resin portion between the protrusions when viewed from the axial direction. The length in the axial direction is shorter than the length on one side in the axial direction and the length on the other side in the same direction of the resin portion sandwiching the protrusion. Therefore, in the axial direction, the contact area of the engaging protrusion with the resin portion increases, and the thickness of the resin portion at the portion sandwiching the engaging protrusion increases, so that the rigidity of the resin portion increases, and the insert member and The breaking strength in the axial direction between the resin portion is improved. Therefore, even if a large load is applied to the arm head in a direction inclined from the rotation plane, the resin portion is prevented from cracking.
[0016]
According to the fourth aspect of the present invention, the engagement protrusion has a total area of the protrusions as viewed from the axial direction of the connecting hole around the cylindrical portion, and is equal to the area of the resin portion between the protrusions as viewed from the axial direction. It is formed so that it becomes more than the total. For this reason, since the contact area of the engaging protrusion with the resin portion in the axial direction increases, the axial breakage strength between the insert member and the resin portion is improved.
[0017]
According to the fifth aspect of the present invention, the engaging protrusion is disposed at a substantially central position in the axial direction of the cylindrical portion, and the length of one side in the axial direction of the resin portion sandwiching the engaging protrusion and the length of the other side in the same direction. Are formed to be substantially equal. Therefore, the rigidity on both sides of the resin portion sandwiching the engagement protrusion can be ensured with a good balance.
[0018]
According to the invention described in claim 6, the arm head used for the wiper arm has improved breakage strength between the insert member and the resin portion.
According to the seventh aspect of the invention, the arm head used in the vehicle wiper has improved breakage strength between the insert member and the resin portion.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
FIG. 1 shows a rear wiper 1 for wiping the rear glass surface of an automobile. The rear wiper 1 includes a wiper arm 2 and a wiper blade 3.
[0020]
The wiper arm 2 includes an arm head 5 that is assembled so as to be integrally rotatable with respect to the pivot shaft 4, and an arm 6 that is connected to the arm head 5 so that a base end thereof can be tilted at a predetermined angle. It is formed in a predetermined shape. The wiper blade 3 having a blade rubber 7 for wiping the glass surface is connected to the tip of the arm 6. The wiper arm 2 performs a predetermined wiping operation when the pivot shaft 4 is reciprocally rotated in a predetermined angle range by driving a wiper motor (not shown).
[0021]
As shown in FIG. 2, a metal insert member 11 such as an aluminum die cast is insert-molded in the arm head 5 in order to improve rigidity at a connecting portion with the pivot shaft 4. As shown in FIGS. 3 to 5, the insert member 11 includes a ring-shaped cylindrical portion 12 having a connecting hole 12 a for connecting to the pivot shaft 4 so as to be integrally rotatable with a central portion, and an outer periphery of the cylindrical portion 12. Eight engaging protrusions 13 are provided that extend in a substantially arc shape outward from the surface and are formed at equal intervals in the circumferential direction. The engagement protrusion 13 is disposed at a substantially central position in the axial direction on the outer peripheral surface of the cylindrical portion 12. Each of the engagement protrusions 13 is in a state of being bitten into the resin portion 14. Therefore, the insert member 11 and the resin portion 14 are reliably engaged with each other to form an integral object.
[0022]
Further, in the present embodiment, as shown in FIG. 5, the engaging protrusion 13 is linearly formed along a straight line L1 whose both end faces 13a in the circumferential direction extend radially from the center of the insert member 11 (connection hole 12a). (The angles θ1 and θ2 formed by the circumferential end surface 13a of the engaging protrusion 13 and the tangent lines J1 and J2 on the end surface 13a are 90 °). Therefore, when an excessive load is applied to the arm head 5 in the rotation direction (the direction of arrow A in FIG. 5), the engagement protrusion 13 is positioned between the circumferential end surface 13a and the resin portion 14 that contacts the end surface 13a. Although a load is applied, the end face 13a is linearly formed along a straight line L1 extending radially from the center of the insert member 11, so that the force is directed outward in the radial direction, that is, the force in the direction in which the resin portion 14 is peeled off. Does not occur. Therefore, even if the excessive load in the rotational direction as described above acts on the arm head 5, the resin portion 14 is prevented from cracking.
[0023]
Further, the engagement protrusions 13 of the present embodiment are arranged at equal intervals around the cylindrical portion 12 alternately with the resin portion 14 when viewed from the axial direction of the connection hole 12a, and the area S1 of the protrusion 13 is the axis of the connection hole 12a. The area S2 or more of the resin portion 14 between the protrusions 13 is seen from the direction. Further, the total area S1 of the protrusions 13 around the cylindrical portion 12 is also equal to or greater than the total area S2 of the resin portions 14 between the protrusions 13. That is, in the axial direction, the contact area S1 of the engagement protrusion 13 with the resin portion 14 is set to be large. Further, as shown in FIG. 4, the engagement protrusion 13 has an axial length D1 set shorter than a length D2 on one side in the axial direction of the resin portion 14 and a length D3 on the other side in the same direction. . In this case, the length D2 on the one side in the axial direction of the resin portion 14 is substantially equal to the length D3 on the other side in the same direction. Thereby, the thickness of the resin part 14 located on both sides in the axial direction across the engagement protrusion 13 is thick, and the rigidity of the resin part 14 is high. Therefore, even when a large load is applied to the arm head 5 in a direction (for example, the direction of arrow B in FIG. 4) inclined from the rotation plane (a plane having the axis of the pivot shaft 4 as a normal line), the resin portion 14 is prevented from cracking.
[0024]
Thus, in this embodiment, the shape of the engagement protrusion 13 of the insert member 11 is devised to improve the break strength in the direction of rotation of the arm head 5 and the direction inclined from the plane of rotation. Breaking strength is improved.
[0025]
As described above, this embodiment has the following features.
(1) The engagement protrusion 13 of the insert member 11 inserted into the arm head 5 is formed along the straight line L1 extending radially from the center of the coupling hole 12a on the circumferential end surface 13a (the outer portion of the radially extending straight line L1). And the inner portion are both substantially straight). Therefore, when an excessive load is applied to the arm head 5 in the rotation direction (the direction of arrow A in FIG. 5), the engagement protrusion 13 is positioned between the circumferential end surface 13a and the resin portion 14 that contacts the end surface 13a. Although a load acts, it is possible to prevent generation of a force (force in the peeling direction) from the shape of the end surface 13a toward the radially outer side, and to improve the breaking strength in the rotational direction between the insert member 11 and the resin portion 14. Can do. Therefore, even if a large load is applied to the arm head 5 in the rotational direction, the resin portion can be prevented from cracking.
[0026]
(2) The engagement protrusions 13 of the insert member 11 are arranged at equal intervals alternately with the resin part 14 around the cylindrical part 12 when viewed from the axial direction of the connection hole 12a, and the area S1 of the protrusion 13 is equal to that of the connection hole 12a. It is more than the area S2 of the resin part 14 between the protrusion 13 seen from the axial direction. Further, the total area S1 of the protrusions 13 around the cylindrical portion 12 is also equal to or greater than the total area S2 of the resin portions 14 between the protrusions 13. That is, in the axial direction, the contact area S1 of the engagement protrusion 13 with the resin portion 14 is set to be large. Further, as shown in FIG. 4, the engagement protrusion 13 has an axial length D1 set shorter than a length D2 on one side in the axial direction of the resin portion 14 and a length D3 on the other side in the same direction. . Thereby, the thickness of the resin part 14 located on both sides in the axial direction across the engagement protrusion 13 is thick, and the rigidity of the resin part 14 is increased. Therefore, even when a large load is applied to the arm head 5 in a direction (for example, the direction of arrow B in FIG. 4) inclined from the rotation plane (a plane having the axis of the pivot shaft 4 as a normal line), the resin portion 14 cracks can be prevented.
[0027]
(3) The engaging protrusion 13 is disposed at a substantially central position in the axial direction, and the length D2 on one side in the axial direction of the resin portion 14 sandwiching the protrusion 13 is substantially equal to the length D3 on the other side in the same direction. Formed as follows. Therefore, the rigidity on both sides of the resin portion 14 sandwiching the engagement protrusion 13 can be secured with a good balance.
[0028]
In addition, you may change embodiment of this invention as follows.
In the above embodiment, the shape of the insert member 11 is not limited to this, and may be changed as appropriate. For example, although eight engagement protrusions 13 are provided, other numbers may be used. Moreover, although the circumferential end surface 13a of the engaging protrusion 13 is formed in a substantially straight line along the straight line L1 extending radially from the center of the coupling hole 12a, the outer portion of the end surface 13a is adjacent to the inner portion. It may be formed in a substantially linear shape so as to protrude to the side 13 (the angles θ1 and θ2 formed by the circumferential end surface 13a of the engaging protrusion 13 and the tangent lines J1 and J2 on the end surface 13a are acute angles smaller than 90 °) Also good). In this case, if an excessive load is applied to the arm head in the rotational direction, the load acts between the circumferential end surface of the engaging protrusion and the resin portion that contacts the end surface. A part of the load changes to a force directed radially inward, that is, a force in a direction opposite to the direction in which the resin portion 14 peels. Therefore, even if this force is generated, the resin portion is not broken. Further, the insert member 11 may be made of a metal material other than aluminum die casting.
[0029]
In the above embodiment, the shape and configuration of the rear wiper 1 such as the arm head 5 are not limited to this, and may be changed as appropriate.
In the above embodiment, the wiper 1 for wiping the rear glass of the automobile is used. However, the wiper 1 may be used for wiping a glass other than the rear glass, for example, a windshield glass (front glass).
[0030]
【The invention's effect】
As described above in detail, according to the present invention, an arm head of a wiper arm that is resin-molded by inserting a metal insert member, the breakage strength between the insert member and the resin portion is improved. It is possible to provide an arm head of a wiper arm that can be used, a wiper arm using the arm head, and a vehicle wiper.
[Brief description of the drawings]
FIG. 1 is a perspective view of a vehicle wiper according to an embodiment.
FIG. 2 is a perspective view of an arm head.
FIG. 3 is a perspective view of an insert member.
FIG. 4 is a longitudinal sectional view of an arm head.
FIG. 5 is a cross-sectional view of the arm head.
FIG. 6 is a perspective view of a conventional arm head.
FIG. 7 is a perspective view of an insert member.
FIG. 8 is a longitudinal sectional view of an arm head.
FIG. 9 is a cross-sectional view of the arm head.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 2 ... Wiper arm, 3 ... Wiper blade, 4 ... Pivot shaft, 5 ... Arm head, 11 ... Insert member, 12 ... Tube part, 12a ... Connection hole, 13 ... Engagement protrusion, 14 ... Resin part, D1-D3 ... Long L1, ... straight line, S1, S2 ... area.

Claims

A part of a wiper arm that holds a wiper blade for wiping the glass surface of a vehicle is formed, and a metal insert member having a connecting hole that is connected to a pivot shaft that is driven to rotate is inserted into a resin insert. An arm head of a wiper arm
The insert member has a cylindrical portion, and has a plurality of engaging protrusions that extend outward from the outer peripheral surface of the cylindrical portion at substantially equal intervals in the circumferential direction of the cylindrical portion and bite into the resin portion of the arm head,
Its engagement projections, that are formed substantially linearly so as to project adjacent projections offset from the center toward Shi pairs to a straight line extending radially from the outer side portions the inner part of the coupling hole in the end face of the circumferential direction The wiper arm arm head.

A part of a wiper arm that holds a wiper blade for wiping the glass surface of a vehicle is formed, and a metal insert member having a connecting hole that is connected to a pivot shaft that is driven to rotate is inserted into a resin insert. An arm head of a wiper arm
The insert member has a cylindrical portion, and has a plurality of engaging protrusions that extend outward from the outer peripheral surface of the cylindrical portion at substantially equal intervals in the circumferential direction of the cylindrical portion and bite into the resin portion of the arm head,
The engaging protrusion is formed so that an area around the cylindrical portion when viewed from the axial direction of the coupling hole is equal to or larger than an area of the resin portion between the protrusions when viewed from the axial direction. The arm head of the wiper arm is characterized in that the length in the axial direction is shorter than the length on one side in the axial direction and the length on the other side in the same direction of the resin portion sandwiching the protrusion.

A part of a wiper arm that holds a wiper blade for wiping the glass surface of a vehicle is formed, and a metal insert member having a connecting hole that is connected to a pivot shaft that is driven to rotate is inserted into a resin insert. An arm head of a wiper arm
The insert member has a cylindrical portion, and has a plurality of engaging protrusions that extend outward from the outer peripheral surface of the cylindrical portion at substantially equal intervals in the circumferential direction of the cylindrical portion and bite into the resin portion of the arm head,
The engaging protrusion is such that the outer part and the inner part are both on the straight line extending radially from the center of the connecting hole on the circumferential end surface, or the outer part is adjacent to the inner part. So that the area around the cylindrical portion when viewed from the axial direction of the connecting hole is equal to or larger than the area of the resin portion between the protrusions when viewed from the axial direction. And the length in the axial direction of the protrusion is shorter than the length on one side in the axial direction of the resin portion sandwiching the protrusion and the length on the other side in the same direction. The arm head of the wiper arm.

In the arm head of the wiper arm according to claim 2 or 3,
The engagement protrusion is configured such that the total area of the protrusions viewed from the axial direction of the connection hole is greater than or equal to the total area of the resin portions between the protrusions viewed from the axial direction around the cylindrical portion. An arm head of a wiper arm, wherein

In the arm head of the wiper arm according to any one of claims 1 to 4,
The engaging protrusion is disposed at a substantially central position in the axial direction of the cylindrical portion,
An arm head of a wiper arm, wherein the length of one side in the axial direction of the resin portion sandwiching the engaging protrusion is substantially equal to the length of the other side in the same direction.

A wiper arm using the arm head according to any one of claims 1 to 5.

6. A vehicle comprising: a wiper arm having the arm head according to claim 1; and a wiper blade connected to a tip of the wiper arm for wiping a glass surface of the vehicle. Wiper.