PROBLEM TO BE SOLVED: To provide a liquid pressure master cylinder for a vehicle comprising a secondary seat which can secure vacuum retention force while keeping down sliding resistance and has excellent assemblability.SOLUTION: A second seal groove 14c comprises a fluid-pressure chamber side wall 14d, an atmosphere side wall 14e and a seal groove bottom wall 14f. A secondary seal 17 comprises a groove bottom wall-side lip part 17a, a sliding-side lip part 17b, an intermediate lip part 17c and a base part 17d, which is formed with an H-shaped cross section in which a first circumferential groove 17e between the groove bottom wall-side lip part 17a and the intermediate lip part 17c is shaped symmetrically relative to a center line CL1 in a cylinder radial direction of the base part 17d, with a second circumferential groove 17f provided between the sliding-side lip part 17b and the intermediate lip part 17c.SELECTED DRAWING: Figure 1

    【課題】 摺動抵抗を低く抑えながら、真空保持力を確保することができ、組み付け性にも優れたセカンダリシールを備えた車両用液圧マスタシリンダを提供する。【解決手段】 第2シール溝14cは、液圧室側壁14dと大気側壁14eとシール溝底壁14fとを備える。セカンダリシール17は、溝底壁側リップ部17aと摺動側リップ部17bと中間リップ部17cと基部17dとを備え、溝底壁側リップ部17aと中間リップ部17cとの間に第1周溝17eが、摺動側リップ部17bと中間リップ部17cとの間に第2周溝17fを設け、基部17dのシリンダ半径方向の中心線CL1に対して対称形状となる断面王字状に形成する。【選択図】 図1


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    Title :

    LIQUID PRESSURE MASTER CYLINDER FOR VEHICLE


    Additional title:

    車両用液圧マスタシリンダ


    Contributors:

    Publication date :

    2016-12-15


    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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