PROBLEM TO BE SOLVED: To provide a reservoir tank of a hydraulic master cylinder capable of automatically restoring a diaphragm to its original shape after filling with a working fluid while vacuuming a hydraulic path.SOLUTION: A hydraulic master cylinder device 4 comprises a reservoir body 5b having a polygonal cross section in a horizontal direction, a cap 7 attached to an upper opening edge of the reservoir body 5b, and a diaphragm 9. The diaphragm 9 comprises: a flange part 9a having an outer shape corresponding to the shape of the upper opening edge 5c of the reservoir body 5b and placed on the upper opening edge 5c; a bellows part 9b provided inside the flange part 9a; and a plane part 9c extending to the inside of a lower end of the bellows part 9b. The bellows part 9b is formed in an irregular shape in which a concave part 9e and a convex part 9f are continuously provided. The convex part 9f comprises a plurality of long side parts 9g and short side parts 9h corresponding to the shape of the upper opening edge 5c. A concave part 9i bent toward a central part side of the diaphragm is formed at a corner part where the long side part 9g and the short side part 9h intersect.SELECTED DRAWING: Figure 1

    【課題】 油圧経路を真空引きしながら作動液を充填した後に、ダイヤフラムを元の形状に自動的に復帰させることができる液圧マスタシリンダのリザーバタンクを提供する。【解決手段】 液圧マスタシリンダ装置4は、水平方向の断面が多角形状のリザーバ本体5bと、リザーバ本体5bの上部開口縁に被着されるキャップ7とダイヤフラム9とを備える。ダイヤフラム9は、リザーバ本体5bの上部開口縁5cの形状に応じた外形を有し、上部開口縁5cに載置するフランジ部9aと、フランジ部9aの内側に設ける蛇腹部9bと、蛇腹部9bの下端内側に延設する平面部9cとを備える。蛇腹部9bは、凹状部9eと凸状部9fとを連続して設けた凹凸状に形成され、凸状部9fは、上部開口縁5cの形状に応じた複数の長辺部9gと短辺部9hとを備え、長辺部9gと短辺部9hとが交わる角部にダイヤフラム中央部側に向けて折り曲げられる凹部9iを形成する。【選択図】 図1


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    Title :

    RESERVOIR TANK OF HYDRAULIC MASTER CYLINDER


    Additional title:

    液圧マスタシリンダのリザーバタンク


    Contributors:

    Publication date :

    2017-09-21


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B60T Bremsanlagen für Fahrzeuge oder Teile davon , VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF / F16J Kolben , PISTONS



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