To provide a negative-pressure type booster which can suppress occurrence of galling of a reaction force member.SOLUTION: A negative-pressure type booster 100 comprises: a plunger 142 which is interposed between an input shaft 141 and an output shaft 147 in a body part 131 of a valve body 130, and of which a base end side is connected to the input shaft 141; a tip member 143 which is provided as to contact a tip side of the plunger 142; and a reaction disc 146 as a reaction force member with which an apical surface 143a of the tip member 143 on a side opposite to the plunger 142 is brought into contact. On an outer peripheral part on a side of the apical surface 143a of the tip member 143, a resin ring 144, which has a linear expansion coefficient which is larger than a linear expansion coefficient of the tip member 143 and is a linear expansion coefficient or less of the body part 131 of the valve body 130, is provided.SELECTED DRAWING: Figure 2

    【課題】反力部材のかじれの発生を抑制すること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、バルブボディ130の本体部131の内部にて入力軸141と出力軸147との間に介装された、入力軸141に対して基端の側が連結されたプランジャ142、プランジャ142の先端の側に当接するように配設された先端部材143、及び、先端部材143のプランジャ142とは反対側の先端面143aが当接する反力部材としてのリアクションディスク146と、を備えている。先端部材143における先端面143aの側の外周部には、先端部材143の線膨張係数よりも大きく、且つ、バルブボディ130の本体部131の線膨張係数以下となる線膨張係数の樹脂リング144が配設される。【選択図】図2


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    Title :

    NEGATIVE-PRESSURE TYPE BOOSTER


    Additional title:

    負圧式倍力装置


    Contributors:
    HATTORI MASABUMI (author) / NOZU SHO (author)

    Publication date :

    2019-10-03


    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



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