PROBLEM TO BE SOLVED: To enhance seal property of a contact part between an operation piston front end face and an elastic piston efficiently, even when a valve cylinder is slightly inclined to an output piston in a non-operation state of a negative pressure piston, and to improve durability.SOLUTION: A negative pressure booster comprises a reaction mechanism 24 comprising: a reaction piston 17 moving forward and backward by reacting an input rod 20 in a valve cylinder 10; an operation piston 15 provided on the valve cylinder 10 in a forward projecting state so as to surround the reaction piston; a cup-shaped output piston 21 continuous to a rear end of an output rod 25 facing a negative pressure chamber, and fitted to the valve cylinder 10 so as to slide forward and backward freely; and an elastic piston 22 stored in the output piston, whose front face faces the output piston 21, and whose rear face faces front end faces of the reaction piston 17 and operation piston 15. On one side of mutual facing surfaces of the operation piston 15 and elastic piston 22, an annular projection P projecting a direction along axial lines of these pistons and contacting the other of the facing surfaces, is integrated and provided.

    【課題】負圧ブースタの非作動状態で弁筒が出力ピストンに対し僅かに傾いても、作動ピストン前端面と弾性ピストンとの間の当接部のシール性を効果的に高め、併せて、耐久性の向上を図る。【解決手段】弁筒10内で入力杆20に連動して前後動する反力ピストン17と、この反力ピストンを囲繞するよう弁筒10に前向きに突設される作動ピストン15と、負圧室に臨む出力杆25の後端に連なり且つ弁筒10に前後摺動可能に嵌合されるカップ状の出力ピストン21と、その出力ピストン内に収納されて前面が出力ピストン21に、また後面が反力ピストン17及び作動ピストン15の前端面にそれぞれ対向する弾性ピストン22とを備える反力機構24を含む負圧ブースタにおいて、作動ピストン15及び弾性ピストン22の相対向面の一方には、それらピストンの軸線に沿う方向に突出して、相対向面の他方に当接する環状突起Pが一体に設けられる。【選択図】図2


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    Titel :

    NEGATIVE PRESSURE BOOSTER


    Weitere Titelangaben:

    負圧ブースタ


    Beteiligte:
    YATABE SHUICHI (Autor:in)

    Erscheinungsdatum :

    2015-12-10


    Medientyp :

    Patent


    Format :

    Elektronische Ressource


    Sprache :

    Japanisch


    Klassifikation :

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



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