To provide a negative pressure type booster device which can be miniaturized without impeding responsiveness during an operation.SOLUTION: A negative pressure type booster device 100 includes an annular seal member 170 which is interposed between an inner peripheral surface 112b 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 communication between a transformation chamber and the atmosphere. The seal member 170 has a cylindrical base section 171, an inner peripheral seal section 172 which is provided on an inner peripheral surface 171a of a base section 171 and is brought into sliding contact with the outer peripheral surface 131b so as to cut off the communication between the transformation chamber R2 and the atmosphere, an outer peripheral seal section 174 which is provided on an outer peripheral surface 171b of the base section 171 and is brought into sliding contact with the inner peripheral surface 112b so as to cut off the communication between the transformation chamber and the atmosphere, and is arranged on a side which is more opened to the atmosphere of the cylindrical section 112a than the inner peripheral seal section 172, and a space section 176 which is adjacent to the outer peripheral seal section 174 on the outer peripheral surface 171b and is communicated with the transformation chamber.SELECTED DRAWING: Figure 3

    【課題】作動時における応答性を阻害することなく、小型化が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112b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内周シール部172と、基部171の外周面171bに設けられていて、内周面112bに摺接して変圧室と大気との連通を遮断し、且つ、内周シール部172よりも筒部112aの大気に開放された側に配置された外周シール部174と、外周面171bにて外周シール部174に隣接して変圧室と連通する空間部176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 :

    2019-05-23


    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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