PROBLEM TO BE SOLVED: To provide a hydraulic master cylinder for a vehicle including a secondary cup seal which secures vacuum retention power while suppressing slide resistance to a lower level.SOLUTION: A secondary cup seal 17 includes a base part 17b, a seal groove bottom wall side lip part 17c, a slide side lip part 17d, and an intermediate lip part 17e. A first peripheral groove 17f is formed between the seal groove bottom wall side lip part 17c and the intermediate lip part 17e, and a second peripheral groove 17g is formed between the slide side lip part 17d and the intermediate lip part 17e. A cutout part 17h is formed at a tip of the intermediate lip part 17e. A length dimension E from a base end surface 17a of the base part 17b to a bottom part of the first peripheral groove 17f is formed so as to be longer than a length dimension C from the base end surface 17a to a bottom part of the second peripheral groove 17g.SELECTED DRAWING: Figure 3

    【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るセカンダリカップ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】セカンダリカップシール17は、基部17bとシール溝底壁側リップ部17cと摺動側リップ部17dと中間リップ部17eとを備え、シール溝底壁側リップ部17cと中間リップ部17eとの間に第1周溝17fを、摺動側リップ部17dと中間リップ部17eとの間に第2周溝17gをそれぞれ形成し、中間リップ部17eの先端に切欠き部17hを形成する。基部17bの基端面17aから第1周溝17fの底部までの長さ寸法Eを、基端面17aから第2周溝17gの底部までの長さ寸法Cよりも長く形成する。【選択図】 図3


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    Title :

    HYDRAULIC MASTER CYLINDER FOR VEHICLE


    Additional title:

    車両用液圧マスタシリンダ


    Contributors:

    Publication date :

    2016-12-01


    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 / B62L BRAKES SPECIALLY ADAPTED FOR CYCLES , Bremsen, besonders für Fahrräder oder Motorräder ausgebildet / F16J Kolben , PISTONS



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