JP3771202B2 - Reservoir - Google Patents

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JP3771202B2
JP3771202B2 JP2002221123A JP2002221123A JP3771202B2 JP 3771202 B2 JP3771202 B2 JP 3771202B2 JP 2002221123 A JP2002221123 A JP 2002221123A JP 2002221123 A JP2002221123 A JP 2002221123A JP 3771202 B2 JP3771202 B2 JP 3771202B2
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JP2004058872A (en
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小林  直樹
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Nissin Kogyo Co Ltd
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Nissin Kogyo Co Ltd
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Description

【0001】
【発明の属する技術分野】
本発明は、各種液体を貯留するリザーバ本体と、該リザーバ本体に被着されるキャップと、リザーバ本体の液面に追随するダイヤフラムとを有するリザーバに係り、詳しくは、ダイヤフラムのシール性を向上した構造に関する。
【0002】
【従来の技術】
自動二輪車や四輪自動車等の車両にあっては、ブレーキやクラッチを液圧作動する液圧マスタシリンダに、作動液を貯留するリザーバが用いられている。
【0003】
このリザーバは、作動液を貯留するリザーバ本体と、該リザーバ本体に被着されるキャップと、可撓性材料で形成されるダイヤフラムとを備え、リザーバ本体の上部口縁とキャップ外周のダイヤフラム押圧面との間にダイヤフラム外側のフランジ部を挟み、これらキャップとダイヤフラムとに挿通した複数の止めねじをリザーバ本体の上部口縁に螺着して、リザーバ本体の上部口縁とキャップとの間をダイヤフラムのフランジ部で液密にシールしている。
【0004】
ダイヤフラムは、この取り付けによって、蛇腹部下端の底板部を作動液の液面に浮かせて配設され、底板部を液面の上昇または下降変化に追随させることによって、液面の波立ちを抑制しながら作動液の増減変化を円滑に行わせるようにしている(例えば、特許文献1または特許文献2参照)。
【0005】
【特許文献1】
特開昭59−96046号公報(第1−2頁、第2図)
【0006】
【特許文献2】
特開昭62−85754号公報(第1−3頁、第1図、第4−6図)
【0007】
【発明が解決しようとする課題】
このような構成にあっては、止めねじの締め付けトルクが、キャップを通してダイヤフラムのフランジ部に押圧力として作用するが、この押圧力は止めねじの周辺から遠ざかるに連れて減衰するため、止めねじから遠い部分ではダイヤフラムのシール性も低下する。
【0008】
この対策として、止めねじの本数を増加する方法が考えられるが、この場合には、着脱時の作業工数が増えるばかりか、リザーバ本体にめねじ孔用の取り付けボス部を増設するため、大幅な重量の増加とコスト高は避けられない。
【0009】
そこで本発明は、止めねじの本数を増加することなく、ダイヤフラムの止めねじから離れた部分にもキャップの押圧力を作用させて、ダイヤフラムのシール性を高めることのできるリザーバを提供することを目的としている。
【0010】
【課題を解決するための手段】
上述の目的を達成するため、本発明は、リザーバ本体の上部口縁と、該リザーバ本体に被着されるキャップ外周のダイヤフラム押圧面との間に、前記リザーバ本体内の液面に追従するダイヤフラム外周のフランジ部を挟み、該フランジ部と前記ダイヤフラム押圧面とに挿通した2本の止めねじを前記リザーバ本体の上部口縁に螺着して、前記キャップとダイヤフラムとをリザーバ本体に被着するリザーバにおいて、前記リザーバ本体の相対向する一対の短側壁と相対向する一対の長側壁との長方体に形成するとともに、前記キャップをリザーバ本体と同じ平面視長方形に形成し、前記止めねじを前記キャップの短辺部の中間位置にそれぞれ設け、前記キャップは、下面のダイヤフラム押圧面に2つの二等辺三角形の頂部を向き合わせて、頂部同士をダイヤフラム押圧面の長辺部の中間部で細幅につなげた形状の凹部を位置させて、ダイヤフラム押圧面の長辺部を止めねじからキャップの中央部方向へ遠ざかるにしたがって、次第にキャップの内側へテーパ状に幅を拡げていき、長辺部の中間部で最大幅に設定したことを特徴としている。
【0013】
【発明の実施の形態】
以下、本発明のリザーバを、自動二輪車等のバーハンドル車両の前輪ブレーキ用液圧マスタシリンダに適用した形態例を図面に基づいて説明する。
【0014】
図1〜図4は、参考例を示し、図1は図2のI−I断面図、図2はハンドルバーに取り付けた液圧マスタシリンダの平面図、図3は図2の一部断面右側面図、図4はリザーバのキャップの斜視図である。
【0015】
前輪ブレーキ用の液圧マスタシリンダ装置1は、液圧発生用の液圧マスタシリンダ2とこれを操作するブレーキレバー3とからなり、ハンドルバー4右側のアクセルグリップ5の近傍を液圧マスタシリンダ2のシリンダボディ6と一体の取り付けブラケット6aと別途のホルダ7とで包持し、これらをボルト8で締結してハンドルバー4の車体前部側に取り付けされている。
【0016】
液圧マスタシリンダ2は、シリンダボディ6の上部にリザーバ本体6bを一体形成し、該リザーバ本体6bに、キャップ11とダイヤフラムプレート12,ダイヤフラム13とを被着してリザーバ10を構成するリザーバ一体型で、リザーバ10内部の貯液室14と、シリンダボディ6にブレーキレバー3側を開口して設けられた有底のシリンダ孔15とを、リリーフポート16及びサプライポート17とで連通させて、貯液室14に貯留されるブレーキ液BFをシリンダ孔15へ随時補給したり、シリンダ孔15内のブレーキ液BFの一部を貯液室14へ還流できるようになっている。
【0017】
シリンダボディ6の車体前部側には、上下一対のレバーホルダ6c,6cが突設されており、ブレーキレバー3は、回動基部3aをレバーホルダ6c,6cにピボット18を用いて枢着し、握り操作部3bをアクセルグリップ5の車体前部側に延出させて回動可能に取り付けされている。
【0018】
シリンダ孔15には、ピストン20がピストンカップ21a,21bを介して液密且つ移動可能に内挿されており、ピストン20とシリンダ孔15の底壁との間に液圧室22が画成されている。シリンダ孔15の底壁には、ユニオン孔23が液圧室22に連通して設けられており、該ユニオン孔23と前輪ブレーキとを配管(いずれも図示しない)にて連結し、ブレーキレバー3の握り操作で液圧室22に発生した液圧を、ユニオン孔23からブレーキホースを通して前輪ブレーキへ供給するようにしている。
【0019】
シリンダ孔15の底壁とピストン20との間にはコイル状の戻しばね24が縮設されており、ブレーキレバー3を握り操作しない非作動時のピストン20は、戻しばね24の弾発力によってシリンダ孔15を開口部方向へ付勢され、その後端部をブレーキレバー3の作用腕3cに当接させて後退限が規制されている。
【0020】
前記リザーバ10は、リザーバ本体6bを、車体幅方向両端に位置する一対の短側壁と、車体前後方向両端に位置する一対の長側壁との長方体に形成し、該リザーバ本体6bに被着される前記キャップ11とダイヤフラムプレート12,ダイヤフラム13のそれぞれを、リザーバ本体6bと同じ平面視長方形に形成している。キャップ11とダイヤフラムプレート12,ダイヤフラム13は、リザーバ本体6bの上部口縁6dに重合され、キャップ11の上方からこれらに差し込んだ2つの止めねじ30を、それぞれリザーバ本体6bのめねじ孔31にねじ込むことにより、キャップ11とダイヤフラムプレート12,ダイヤフラム13とがリザーバ本体6bに一体に組み付けされる。
【0021】
リザーバ本体6bは、短側壁内側中央に2つの取り付けボス部6eが設けられており、前記めねじ孔31はこの取り付けボス部6eに穿設されている。キャップ11は、下面外周に口縁11aを備え、該口縁11aの内側にダイヤフラム押圧面32を、ダイヤフラムプレート12とダイヤフラム13のフランジ部12a,13aの厚さよりもやや浅い深さで周状に凹設して、その内側を浅平底の凹部33としており、キャップ11をリザーバ本体6bに被着した際には、口縁11aとダイヤフラム押圧面32とがリザーバ本体6bの上部口縁6dと対向するようになっている。口縁11aとダイヤフラム押圧面32には、2つの大気連通孔34がキャップ11の外部と凹部33とを連通して設けられており、該大気連通孔34をざくり面付きのねじ挿通孔35が縦方向に交差して設けられている。
【0022】
ダイヤフラムプレート12とダイヤフラム13の外周には、キャップ11のダイヤフラム押圧面32に収容されるフランジ部12a,13aが設けられており、該フランジ部12a,13aの前記リザーバ本体6bの取り付けボス部6eと対応する位置に、ねじ挿通孔36,37が穿設されている。ダイヤフラムプレート12の略中央には通気孔38が穿設され、フランジ部12aの内側下面にガイドリブ12bが垂設されている。ダイヤフラム13は、フランジ部13aの内側に環状の蛇腹部13bが伸縮自在に垂設され、該蛇腹部13bの下端に底板部13cが設けられている。
【0023】
ダイヤフラムプレート12とダイヤフラム13とは、外周のフランジ部12a,13aをダイヤフラム押圧面32に収容して、キャップ11の下側に組み合わせされる。この状態において、ダイヤフラム13のフランジ部13aは、キャップ11の口縁11aからやや下側に突出している。次に、キャップ11の口縁11aをリザーバ本体6bの上部口縁6dの外周側に、またキャップ11のダイヤフラム押圧面32と、ダイヤフラムプレート12とダイヤフラム13のフランジ部12a,13aをリザーバ本体6bの上部口縁6dの内周側にそれぞれ載せて、キャップ11とダイヤフラムプレート12とダイヤフラム13のねじ挿通孔35〜37をリザーバ本体6bのめねじ孔31上に位置合わせする。
【0024】
そして、ねじ挿通孔35〜37に挿通した止めねじ30のそれぞれを、前述のようにめねじ孔31に螺着することにより、止めねじ30の締め付けトルクが、キャップ11のダイヤフラム押圧面32からダイヤフラムプレート12とダイヤフラム13のフランジ部12a,13aに押圧力として作用して、該フランジ部12a,13aをリザーバ本体6bの上部口縁6dとキャップ11のダイヤフラム押圧面32とで挟圧し、リザーバ本体6bの上部口縁6dをダイヤフラム13のフランジ部13aにて液密にシールする(図1,図3)。
【0025】
この取り付けにより、ダイヤフラム13の蛇腹部13bが貯液室14の上部空間に収容され、底板部13cがブレーキ液BFの液面上に配設される。底板部13cは、液面の上昇または下降変化に追随して液面の波立ちを抑制し、また蛇腹部13bは増減する上部空間に連れて拡縮し、上部空間の空気がブレーキ液BFに混入するのを有効に防止する。蛇腹部13bの内部は、大気連通孔34と凹部33と通気孔38とを通してリザーバ外部と連通しており、ブレーキ液BFの液面が上昇または下降した際に、蛇腹部13b内の空気を吸排して、蛇腹部13bの伸縮と底板部13cの昇降とが良好に行えるようにしている。
【0026】
前記止めねじ30は、長手方向両端に位置する各ダイヤフラム押圧面32の短辺部32aの中間位置にそれぞれ設けられている。また、キャップ11の厚さは、凹部33の天井面が平らで、上面が長手方向へ円弧状に膨らんでいるため、長手方向両端が一番薄く、長手方向中央部分が一番厚くなっている。すなわち、キャップ11のダイヤフラム押圧面32は、止めねじ30が位置する長手方向両端の短辺部32aの部分で外側の肉厚が薄いために剛性力が低く、また、キャップ11の幅方向両端に位置するダイヤフラム押圧面32の長辺部32bでは、止めねじ30から遠ざかるに連れて増大する外側の肉厚によって剛性力も増していき、長辺部32b中間の最大厚さ部分で最大の剛性力を持つものとなる。
【0027】
このため、ねじ挿通孔35が位置するダイヤフラム押圧面32の短辺部32aでは、止めねじ30の締め付けトルクがダイヤフラム13のフランジ部13aへ押圧力として充分に作用する。また、ダイヤフラム押圧面32の長辺部32bでは、止めねじ30から遠ざかるに連れて減衰する押圧力を、これに反比例して増大する上部の肉厚部分が次第に剛性力を増して、ダイヤフラム13のフランジ部13aに対する押圧力を補う。
【0028】
この結果、キャップ11のダイヤフラム押圧面32からダイヤフラム13のフランジ部13aに作用する押圧力が極力均等化し、止めねじ30,30から最も離れたダイヤフラム押圧面32の長辺部32b中間部分でも充分なシール性が得られるようになる。また、使用する止めねじ30の本数や着脱時の作業工数が従前通りで済むので、作業性と経済性に優れる。さらに、新規の部品はキャップ11のみで、リザーバ本体6bとダイヤフラムプレート12,ダイヤフラム13,止めねじ30には既存のものをそのまま用いることができるので、従来品に対する汎用性が極めて高い。
【0029】
次に、本発明の一形態例を図5〜図7に基づいて説明する。なお、図中、前述の参考例と同一の部分には同一の番号を付して、詳細な説明を省略する。
【0035】
図5〜図7は、本発明を適用した一形態例を示すもので、図5はハンドルバーに取り付けた液圧マスタシリンダの平面図、図6は図5のX−X断面図、図7はリザーバのキャップの斜視図である。
【0036】
本形態例のリザーバ50は、参考例と同一形状のリザーバ本体6b,ダイヤフラムプレート12,ダイヤフラム13と、参考例とは異なる形状のキャップ51とからなっている。
【0037】
キャップ51は、下面外周に口縁51aとダイヤフラム押圧面52とを備えており、このダイヤフラム押圧面52とリザーバ本体6bの上部口縁6dとでダイヤフラムプレート12とダイヤフラム13のフランジ部12a,13aを挟圧し、リザーバ本体6bの上部口縁6dをダイヤフラム13のフランジ部13aにて液密にシールする。ダイヤフラム押圧面52は、ダイヤフラムプレート12とダイヤフラム13のフランジ部12a,13aの厚さよりもやや浅い深さで周状に凹設され、その内側を浅平底の凹部53となしている。
【0038】
キャップ51の口縁51aとダイヤフラム押圧面52には、長手方向両端に位置する短辺部の中央部に大気連通孔54,54が設けられ、長手方向両端に位置するダイヤフラム押圧面52の短辺部52aの中央部に、ざくり面付きのねじ挿通孔55が大気連通孔54と交差して設けられている。
【0039】
また、口縁51aは全周が同一幅で、さらにダイヤフラム押圧面52は、長手方向両端の短辺部52a,52aが同一幅でそれぞれ形成されるが、キャップ51の幅方向両端に位置するダイヤフラム押圧面52の長辺部52b,52bは、ねじ挿通孔55の止めねじ30からキャップ51の中央部方向へ遠ざかるにしたがって、次第にキャップ51の内側へテーパ状に幅を拡げていき、長辺部52bの中間部で最大幅となるように設定されている。このため、ダイヤフラム押圧面52の内側に位置する凹部53は、2つの二等辺三角形の頂部を向き合わせて、頂部同士を長辺部52bの中間部で細幅につなげたごとき形状となっている。
【0040】
キャップ51はこのように、ダイヤフラム押圧面52の長辺部52b,52bが、止めねじ30を配設した短辺部52a,52aの近傍で最小幅に、また止めねじ30から遠ざかるにしたがって幅拡となるため、キャップ51の中央部へ向けて次第に剛性力を増加していく。
【0041】
このため、止めねじ30が位置するダイヤフラム押圧面52の短辺部52aでは、止めねじ30の締め付けトルクが、ダイヤフラム13のフランジ部13aに対する押圧力として従前通り充分に作用する。また、ダイヤフラム押圧面52の長辺部52b部分では、止めねじ30から遠ざかるに連れて減衰する押圧力を、これに反比例して拡大する幅広部分が次第に剛性力を増してこれを補うので、ダイヤフラム13の全体に充分なシール性が得られる。
【0051】
なお、前述の参考例及び一形態例では、ダイヤフラムとダイヤプラムプレートとを併用して説明したが、本発明はダイヤプラムプレートを省略しても差し支えない。さらに本発明は、参考例及び一形態例で示したブレーキ用の液圧マスタシリンダ装置以外に、車両のクラッチ用液圧マスタシリンダ装置や、それ以外の各種液体を貯留するリザーバに広く適用が可能である。
【0052】
【発明の効果】
以上説明したように、本発明のリザーバによれば、止めねじから遠く離れた部分であっても、キャップからダイヤフラムに作用する押圧力が高められ、ダイヤフラムに充分なシール性が得られるようになる。さらに、このようにシール性を高めながらも、止めねじの本数や着脱時の工数が従前通りで済むので、作業性と経済性に優れている。また、新規に製作する部品はキャップのみで、リザーバ本体やダイヤフラムプレート,ダイヤフラム,止めねじには既存のものをそのまま用いることができるので、従来品に対する汎用性が極めて高い。
【図面の簡単な説明】
【図1】 図2のI−I断面図
【図2】 参考例を示すハンドルバーに取り付けた液圧マスタシリンダの平面図
【図3】 図2の一部断面右側面図
【図4】 リザーバのキャップの斜視図
【図5】 本発明の一形態例を示すハンドルバーに取り付けた液圧マスタシリンダの平面図
【図6】 図5のX−X断面図
【図7】 リザーバのキャップの斜視図
【符号の説明】
1…液圧マスタシリンダ装置、2…液圧マスタシリンダ、3…ブレーキレバー、4…ハンドルバー、5…アクセルグリップ、6…シリンダボディ、6b,6f…リザーバ本体、6d,6g…上部口縁、6e…取り付けボス部、10,50…リザーバ、11,51…キャップ、11a,51a…口縁、12…ダイヤフラムプレート、12a,13a…フランジ部、13…ダイヤフラム、13b…蛇腹部、13c…底板部、14…貯液室、15…シリンダ孔、BF…ブレーキ液、30…止めねじ、31…めねじ孔、32,52…ダイヤフラム押圧面、32a,52a…短辺部、32b,52b…長辺部、33,53…凹部、35,36,37,55…ねじ挿通孔
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a reservoir having a reservoir main body for storing various liquids, a cap attached to the reservoir main body, and a diaphragm that follows the liquid level of the reservoir main body. Specifically, the sealing performance of the diaphragm is improved. Concerning structure.
[0002]
[Prior art]
In a vehicle such as a motorcycle or a four-wheeled vehicle, a reservoir that stores hydraulic fluid is used in a hydraulic master cylinder that hydraulically operates a brake or a clutch.
[0003]
The reservoir includes a reservoir body that stores hydraulic fluid, a cap that is attached to the reservoir body, and a diaphragm that is formed of a flexible material, and an upper lip of the reservoir body and a diaphragm pressing surface on the outer periphery of the cap. The flange on the outer side of the diaphragm is sandwiched between them, and a plurality of set screws inserted through the cap and the diaphragm are screwed onto the upper lip of the reservoir body, and the diaphragm between the upper lip of the reservoir body and the cap is inserted. It is sealed in a liquid-tight manner at the flange.
[0004]
With this attachment, the diaphragm is arranged with the bottom plate portion at the lower end of the bellows portion floating on the liquid level of the working fluid, and by keeping the bottom plate portion following the rise or fall of the liquid level, suppressing the undulation of the liquid level The increase / decrease change of the hydraulic fluid is performed smoothly (see, for example, Patent Document 1 or Patent Document 2).
[0005]
[Patent Document 1]
JP 59-96046 A (page 1-2, FIG. 2)
[0006]
[Patent Document 2]
JP 62-85754 A (page 1-3, FIG. 1, FIG. 4-6)
[0007]
[Problems to be solved by the invention]
In such a configuration, the tightening torque of the set screw acts as a pressing force on the flange portion of the diaphragm through the cap, but this pressing force attenuates as it moves away from the periphery of the set screw. In the far part, the sealing performance of the diaphragm is also lowered.
[0008]
As a countermeasure, a method of increasing the number of set screws can be considered. In this case, however, not only will the number of man-hours for attachment / detachment increase, but also the mounting boss for the female screw hole will be added to the reservoir body, which will greatly increase Increase in weight and cost are inevitable.
[0009]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a reservoir capable of enhancing the sealing performance of a diaphragm by applying a pressing force of a cap to a portion away from the set screw of the diaphragm without increasing the number of set screws. It is said.
[0010]
[Means for Solving the Problems]
In order to achieve the above-described object, the present invention provides a diaphragm that follows the liquid level in the reservoir body between the upper lip of the reservoir body and the diaphragm pressing surface on the outer periphery of the cap that is attached to the reservoir body. Two captive screws inserted between the flange portion and the diaphragm pressing surface are screwed to the upper lip of the reservoir body, and the cap and diaphragm are attached to the reservoir body. In the reservoir, the reservoir body is formed in a rectangular parallelepiped with a pair of short side walls facing each other and a pair of long side walls facing each other, the cap is formed in the same rectangular shape as the reservoir body, and the set screw is The cap is provided at each intermediate position of the short side portion of the cap, and the cap is formed by facing the tops of two isosceles triangles to the diaphragm pressing surface of the lower surface. Position the concave part with a narrow shape at the middle part of the long side of the diaphragm pressing surface, and gradually move the long side of the diaphragm pressing surface away from the set screw toward the center of the cap. The width is increased inwardly in a tapered shape, and the maximum width is set at the middle part of the long side part .
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment in which the reservoir of the present invention is applied to a hydraulic master cylinder for a front wheel brake of a bar handle vehicle such as a motorcycle will be described with reference to the drawings.
[0014]
1 to 4 show a reference example , FIG. 1 is a cross-sectional view taken along line II in FIG. 2, FIG. 2 is a plan view of a hydraulic master cylinder attached to a handlebar, and FIG. FIG. 4 is a perspective view of a reservoir cap.
[0015]
A hydraulic master cylinder device 1 for front wheel braking includes a hydraulic master cylinder 2 for generating hydraulic pressure and a brake lever 3 for operating the hydraulic master cylinder 2. The hydraulic master cylinder 2 is located near the accelerator grip 5 on the right side of the handlebar 4. The cylinder body 6 and a mounting bracket 6 a integral with the cylinder body 6 and a separate holder 7, which are fastened with bolts 8, are attached to the front side of the vehicle body of the handlebar 4.
[0016]
In the hydraulic master cylinder 2, a reservoir body 6b is integrally formed on an upper portion of a cylinder body 6, and a reservoir 11 is formed by forming a reservoir 10 by attaching a cap 11, a diaphragm plate 12, and a diaphragm 13 to the reservoir body 6b. Thus, the liquid storage chamber 14 inside the reservoir 10 and the bottomed cylinder hole 15 provided in the cylinder body 6 with the brake lever 3 side opened are communicated with each other by the relief port 16 and the supply port 17 to store the liquid. The brake fluid BF stored in the fluid chamber 14 can be replenished to the cylinder hole 15 at any time, and a part of the brake fluid BF in the cylinder hole 15 can be returned to the fluid storage chamber 14.
[0017]
A pair of upper and lower lever holders 6c, 6c are projected on the front side of the body of the cylinder body 6, and the brake lever 3 pivotally attaches the rotating base 3a to the lever holders 6c, 6c using a pivot 18. The grip operation part 3b is attached to the accelerator grip 5 so as to extend to the front side of the vehicle body and to be rotatable.
[0018]
A piston 20 is inserted into the cylinder hole 15 through piston cups 21 a and 21 b so as to be liquid-tight and movable, and a hydraulic chamber 22 is defined between the piston 20 and the bottom wall of the cylinder hole 15. ing. A union hole 23 is provided in the bottom wall of the cylinder hole 15 so as to communicate with the hydraulic pressure chamber 22. The union hole 23 and the front wheel brake are connected by a pipe (both not shown), and the brake lever 3 The hydraulic pressure generated in the hydraulic chamber 22 by the gripping operation is supplied from the union hole 23 to the front wheel brake through the brake hose.
[0019]
A coiled return spring 24 is contracted between the bottom wall of the cylinder hole 15 and the piston 20, and the piston 20 in the non-operating state where the brake lever 3 is not operated is operated by the elastic force of the return spring 24. The cylinder hole 15 is biased in the direction of the opening, and the rear end thereof is brought into contact with the operating arm 3c of the brake lever 3 to restrict the backward movement limit.
[0020]
In the reservoir 10, the reservoir body 6b is formed in a rectangular parallelepiped shape having a pair of short side walls located at both ends in the vehicle body width direction and a pair of long side walls located at both ends in the vehicle body longitudinal direction, and is attached to the reservoir body 6b. Each of the cap 11, the diaphragm plate 12, and the diaphragm 13 is formed in the same rectangular shape in plan view as the reservoir body 6 b. The cap 11, the diaphragm plate 12, and the diaphragm 13 are superposed on the upper lip 6d of the reservoir body 6b, and two set screws 30 inserted into these from above the cap 11 are respectively screwed into the female screw holes 31 of the reservoir body 6b. Thus, the cap 11, the diaphragm plate 12, and the diaphragm 13 are assembled integrally with the reservoir body 6b.
[0021]
The reservoir body 6b is provided with two mounting bosses 6e at the inner center of the short side wall, and the female screw hole 31 is formed in the mounting boss 6e. The cap 11 is provided with a lip 11a on the outer periphery of the lower surface, and a diaphragm pressing surface 32 is formed inside the lip 11a at a depth slightly shallower than the thickness of the flange portions 12a and 13a of the diaphragm plate 12 and the diaphragm 13. The concave portion 33 is formed as a shallow flat concave portion 33. When the cap 11 is attached to the reservoir body 6b, the rim 11a and the diaphragm pressing surface 32 face the upper rim 6d of the reservoir body 6b. It is supposed to be. Two atmospheric communication holes 34 are provided in the rim 11a and the diaphragm pressing surface 32 so as to communicate the outside of the cap 11 and the concave portion 33, and a screw insertion hole 35 with a facing surface is formed in the atmospheric communication hole 34. It is provided to intersect in the vertical direction.
[0022]
Flange portions 12a and 13a accommodated in the diaphragm pressing surface 32 of the cap 11 are provided on the outer periphery of the diaphragm plate 12 and the diaphragm 13, and the mounting boss portion 6e of the reservoir body 6b of the flange portions 12a and 13a is provided. Screw insertion holes 36 and 37 are formed at corresponding positions. A vent hole 38 is bored substantially at the center of the diaphragm plate 12, and a guide rib 12b is suspended from the inner lower surface of the flange portion 12a. The diaphragm 13 has an annular bellows portion 13b suspended from the inside of the flange portion 13a so as to be stretchable and a bottom plate portion 13c is provided at the lower end of the bellows portion 13b.
[0023]
The diaphragm plate 12 and the diaphragm 13 are combined on the lower side of the cap 11 with the outer flange portions 12 a and 13 a being accommodated in the diaphragm pressing surface 32. In this state, the flange portion 13 a of the diaphragm 13 protrudes slightly downward from the mouth edge 11 a of the cap 11. Next, the rim 11a of the cap 11 is placed on the outer peripheral side of the upper rim 6d of the reservoir body 6b, the diaphragm pressing surface 32 of the cap 11, the flange portions 12a and 13a of the diaphragm plate 12, and the diaphragm 13 are connected to the reservoir body 6b. The cap 11, the diaphragm plate 12, and the screw insertion holes 35 to 37 of the diaphragm 13 are placed on the inner peripheral side of the upper lip 6 d and aligned with the female screw holes 31 of the reservoir body 6 b.
[0024]
Then, each of the set screws 30 inserted into the screw insertion holes 35 to 37 is screwed into the female screw holes 31 as described above, whereby the tightening torque of the set screw 30 is increased from the diaphragm pressing surface 32 of the cap 11 to the diaphragm. The flange 12a, 13a of the plate 12 and the diaphragm 13 acts as a pressing force, and the flanges 12a, 13a are clamped by the upper lip 6d of the reservoir body 6b and the diaphragm pressing surface 32 of the cap 11 to form the reservoir body 6b. The upper rim 6d is liquid-tightly sealed with the flange portion 13a of the diaphragm 13 (FIGS. 1 and 3).
[0025]
By this attachment, the bellows portion 13b of the diaphragm 13 is accommodated in the upper space of the liquid storage chamber 14, and the bottom plate portion 13c is disposed on the surface of the brake fluid BF. The bottom plate portion 13c suppresses the undulation of the liquid level following the rise or fall of the liquid level, and the bellows portion 13b expands and contracts with the increasing and decreasing upper space, and the air in the upper space is mixed into the brake fluid BF. Effectively prevent The interior of the bellows portion 13b communicates with the outside of the reservoir through the air communication hole 34, the concave portion 33, and the vent hole 38, and when the liquid level of the brake fluid BF rises or falls, the air in the bellows portion 13b is sucked and discharged. Thus, the bellows portion 13b can be expanded and contracted and the bottom plate portion 13c can be lifted and lowered.
[0026]
The set screw 30 is provided at an intermediate position of the short side portion 32a of each diaphragm pressing surface 32 located at both ends in the longitudinal direction. The cap 11 has a flat ceiling surface of the recess 33 and the upper surface bulges in an arc shape in the longitudinal direction, so that both ends in the longitudinal direction are the thinnest and the central part in the longitudinal direction is the thickest. . That is, the diaphragm pressing surface 32 of the cap 11 has a low rigidity because the outer wall thickness is thin at the short side portions 32a at both ends in the longitudinal direction where the set screw 30 is positioned, and the cap 11 has both ends in the width direction. In the long side portion 32b of the diaphragm pressing surface 32 that is positioned, the rigidity force increases due to the outer wall thickness that increases as the distance from the set screw 30 increases, and the maximum rigidity force is provided in the maximum thickness portion in the middle of the long side portion 32b. It will have.
[0027]
For this reason, at the short side portion 32 a of the diaphragm pressing surface 32 where the screw insertion hole 35 is located, the tightening torque of the set screw 30 sufficiently acts as a pressing force on the flange portion 13 a of the diaphragm 13. Further, in the long side portion 32 b of the diaphragm pressing surface 32, the upper wall thickness portion that increases in inverse proportion to the pressing force that attenuates with increasing distance from the set screw 30 gradually increases the rigidity, so that the diaphragm 13 Supplement the pressing force on the flange portion 13a.
[0028]
As a result, the pressing force acting on the flange 13a of the diaphragm 13 from the diaphragm pressing surface 32 of the cap 11 is equalized as much as possible, and the middle portion of the long side portion 32b of the diaphragm pressing surface 32 farthest from the set screws 30 and 30 is sufficient. Sealability can be obtained. In addition, since the number of set screws 30 to be used and the number of work steps at the time of attachment and detachment are the same as before, it is excellent in workability and economy. Furthermore, since the new part is only the cap 11 and existing parts can be used as they are for the reservoir body 6b, the diaphragm plate 12, the diaphragm 13, and the set screw 30, the versatility of the conventional product is extremely high.
[0029]
Next, an example of the present invention will be described with reference to FIGS. In the figure, the same parts as those in the above-described reference example are denoted by the same reference numerals, and detailed description thereof is omitted.
[0035]
5 to 7 show an embodiment to which the present invention is applied . FIG. 5 is a plan view of a hydraulic master cylinder attached to a handle bar. FIG. 6 is a sectional view taken along line XX in FIG . FIG. 3 is a perspective view of a reservoir cap.
[0036]
Reservoir 50 of this embodiment is Reference Example the same shape of the reservoir body 6b, the diaphragm plate 12, a diaphragm 13, are made of different shapes of the cap 51. The reference example.
[0037]
The cap 51 includes a rim 51a and a diaphragm pressing surface 52 on the outer periphery of the lower surface. The diaphragm pressing surface 52 and the upper rim 6d of the reservoir body 6b connect the flange portions 12a and 13a of the diaphragm plate 12 and the diaphragm 13. The upper rim 6 d of the reservoir body 6 b is liquid-tightly sealed by the flange portion 13 a of the diaphragm 13. The diaphragm pressing surface 52 is recessed in a circumferential shape with a depth slightly shallower than the thicknesses of the flange portions 12a and 13a of the diaphragm plate 12 and the diaphragm 13, and the inside thereof forms a recessed portion 53 having a shallow flat bottom.
[0038]
The mouth edge 51a of the cap 51 and the diaphragm pressing surface 52 are provided with air communication holes 54, 54 at the center of the short side located at both ends in the longitudinal direction, and the short side of the diaphragm pressing surface 52 located at both ends in the longitudinal direction. A screw insertion hole 55 with a facing surface is provided at the center of the portion 52 a so as to intersect the atmospheric communication hole 54.
[0039]
Further, the rim 51a has the same width on the entire circumference, and the diaphragm pressing surface 52 has short side portions 52a and 52a at the both ends in the longitudinal direction having the same width, but the diaphragm positioned at both ends in the width direction of the cap 51. The long side portions 52b and 52b of the pressing surface 52 gradually increase in width toward the inside of the cap 51 as the distance from the set screw 30 of the screw insertion hole 55 toward the center portion of the cap 51 increases. It is set to have the maximum width at the middle part of 52b. For this reason, the recessed part 53 located inside the diaphragm pressing surface 52 has a shape such that the tops of two isosceles triangles face each other and the tops are connected to each other narrowly at the middle part of the long side part 52b. .
[0040]
In this way, the cap 51 has the long sides 52b and 52b of the diaphragm pressing surface 52 having a minimum width in the vicinity of the short sides 52a and 52a where the set screw 30 is disposed, and the width of the cap 51 as the distance from the set screw 30 increases. Therefore, the rigidity is gradually increased toward the center portion of the cap 51.
[0041]
For this reason, at the short side portion 52a of the diaphragm pressing surface 52 where the set screw 30 is located, the tightening torque of the set screw 30 acts sufficiently as before as the pressing force against the flange portion 13a of the diaphragm 13. Further, in the long side portion 52b portion of the diaphragm pressing surface 52, the pressing force that attenuates as the distance from the set screw 30 increases, and the wide portion that increases in inverse proportion to this gradually increases the rigidity and compensates for this. A sufficient sealing property can be obtained for the entire 13.
[0051]
In the reference example and the embodiment described above, the diaphragm and the diaphragm plate are used in combination, but the present invention may omit the diaphragm plate. Further, the present invention can be widely applied to a hydraulic master cylinder device for a clutch of a vehicle and a reservoir for storing various other liquids in addition to the hydraulic master cylinder device for a brake shown in the reference example and the embodiment. It is.
[0052]
【The invention's effect】
As described above, according to the reservoir of the present invention, the pressing force acting on the diaphragm from the cap can be increased even at a portion far from the set screw, and sufficient sealing performance can be obtained for the diaphragm. . Furthermore, while improving the sealing performance in this way, the number of set screws and the number of man-hours for attaching and detaching are all the same as before, so that workability and economy are excellent. In addition, the parts to be newly manufactured are only caps, and existing ones can be used as they are for the reservoir body, diaphragm plate, diaphragm, and set screw.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view taken along line II in FIG. 2. FIG. 2 is a plan view of a hydraulic master cylinder attached to a handlebar showing a reference example . FIG. 3 is a partial right side view of FIG. perspective of one plane view of a hydraulic master cylinder mounted on the handle bar indicating the embodiment [6] sectional view taken along line X-X in FIG. 5 FIG 7 of the reservoir cap perspective view of the cap [5] the present invention Figure [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Hydraulic master cylinder apparatus, 2 ... Hydraulic master cylinder, 3 ... Brake lever, 4 ... Handlebar, 5 ... Accelerator grip, 6 ... Cylinder body, 6b, 6f ... Reservoir main body, 6d, 6g ... Upper edge, 6e ... mounting boss part, 10, 50 ... reservoir, 11, 51 ... cap, 11a, 51a ... mouth edge, 12 ... diaphragm plate, 12a, 13a ... flange part, 13 ... diaphragm, 13b ... bellows part, 13c ... bottom plate part , 14 ... Liquid storage chamber, 15 ... Cylinder hole, BF ... Brake fluid, 30 ... Set screw, 31 ... Female screw hole, 32, 52 ... Diaphragm pressing surface, 32a, 52a ... Short side part, 32b, 52b ... Long side Part, 33, 53 ... concave part, 35, 36, 37, 55 ... screw insertion hole

Claims (1)

リザーバ本体の上部口縁と、該リザーバ本体に被着されるキャップ外周のダイヤフラム押圧面との間に、前記リザーバ本体内の液面に追従するダイヤフラム外周のフランジ部を挟み、該フランジ部と前記ダイヤフラム押圧面とに挿通した2本の止めねじを前記リザーバ本体の上部口縁に螺着して、前記キャップとダイヤフラムとをリザーバ本体に被着するリザーバにおいて、前記リザーバ本体の相対向する一対の短側壁と相対向する一対の長側壁との長方体に形成するとともに、前記キャップをリザーバ本体と同じ平面視長方形に形成し、前記止めねじを前記キャップの短辺部の中間位置にそれぞれ設け、前記キャップは、下面のダイヤフラム押圧面に2つの二等辺三角形の頂部を向き合わせて、頂部同士をダイヤフラム押圧面の長辺部の中間部で細幅につなげた形状の凹部を位置させて、ダイヤフラム押圧面の長辺部を止めねじからキャップの中央部方向へ遠ざかるにしたがって、次第にキャップの内側へテーパ状に幅を拡げていき、長辺部の中間部で最大幅に設定したことを特徴とするリザーバ。A flange portion on the outer periphery of the diaphragm that follows the liquid level in the reservoir body is sandwiched between an upper rim of the reservoir body and a diaphragm pressing surface on the outer periphery of the cap that is attached to the reservoir body. In a reservoir in which two cap screws inserted into the diaphragm pressing surface are screwed onto the upper rim of the reservoir body, and the cap and diaphragm are attached to the reservoir body, a pair of opposed reservoir bodies are opposed to each other. The cap is formed in the same rectangular shape as the reservoir main body, and the set screw is provided at an intermediate position of the short side portion of the cap. The cap has two isosceles triangular apexes facing the diaphragm pressing surface on the lower surface and the apexes are located in the long side of the diaphragm pressing surface. As the concave part of the shape connected to the narrow part at the part is positioned and the long side part of the diaphragm pressing surface is moved away from the set screw toward the center part of the cap, the width is gradually expanded in a tapered shape toward the inside of the cap, A reservoir characterized in that the maximum width is set in the middle part of the long side part .
JP2002221123A 2002-07-30 2002-07-30 Reservoir Expired - Fee Related JP3771202B2 (en)

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