To provide a negative pressure type booster device capable of holding airtightness without impeding operation feeling and responsiveness during the operation of a seal member.SOLUTION: A negative pressure type booster device 100 includes an annular seal member 170 which is interposed between an inner peripheral surface 112c of a cylindrical section 112a provided in a booster shell 110 and an outer peripheral surface 131b of a valve body 130 and cuts off the communication between a pressure change chamber and the atmosphere. The seal member 170 has a cylindrical base section 171, a seal section 172 which is provided on an inner peripheral surface 171a of the base section 171, is brought into slide contact with the outer peripheral surface 131b and cuts off the communication between the pressure change chamber R2 and the atmosphere, a circumferential recess 174 which is provided on an outer peripheral surface 171b of the base section 171 and allows displacement of the seal section 172 in a radial direction in a state in which the seal section 172 is brought into slide contact with the outer peripheral surface 131b, and a circumferential abutting section 175 which is provided on the outer peripheral surface 171b of the base section 171 and is brought into pressure contact with the inner peripheral surface 112c.SELECTED DRAWING: Figure 3

    【課題】シール部材が作動時における操作フィーリング及び応答性を阻害することなく気密性を保持可能な負圧式倍力装置を提供すること。【解決手段】負圧式倍力装置100は、ブースタシェル110に設けられた筒部112aの内周面112cとバルブボディ130の外周面131bとの間に介装されて、変圧室と大気との連通を遮断する環状のシール部材170を備えている。シール部材170は、筒状の基部171と、基部171の内周面171aに設けられていて、外周面131bに摺接して変圧室R2と大気との連通を遮断するシール部172と、基部171の外周面171bに設けられていて、シール部172が外周面131bに摺接した状態で径方向へのシール部172の変位を許容する周状凹部174と、基部171の外周面171bに設けられていて、内周面112cに圧接する周状の当接部175と、を有する。【選択図】図3


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    Title :

    NEGATIVE PRESSURE TYPE BOOSTER DEVICE


    Additional title:

    負圧式倍力装置


    Contributors:

    Publication date :

    2019-10-17


    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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