To provide a negative pressure type booster which can improve sealability of a negative pressure valve and an atmospheric valve without increasing a reaction force in an initial operation region.SOLUTION: A spring 44 for energizing a negative pressure valve body 43 and an atmospheric valve body 43 is arranged between the negative pressure valve body 43 and the atmospheric valve body 43, and first engagement parts 71 and 710 moved integrally with a valve body 130 or second engagement parts 72 and 720 moved integrally with an input member 140, in which the first engagement parts 71 and 710 and the second engagement parts 72 and 720 are formed so as to move relative to each other, and the engagement state of the spring 44 is switched from a first state where the spring 44 is engaged with the first engagement parts 71 and 710 to a second state where the spring 44 is engaged with the second engagement parts 72 and 720 accompanied by relative movement of the input member 140 at an initial position to the valve body 130.SELECTED DRAWING: Figure 3

    【課題】初期操作域での反力を高めることなく、負圧弁及び大気弁のシール性を向上させることができる負圧式倍力装置を提供する。【解決手段】本発明において、負圧弁体43及び大気弁体43を付勢するスプリング44は、負圧弁体43及び大気弁体43と、バルブボディ130と一体的に移動する第1係止部71、710又は入力部材140と一体的に移動する第2係止部72、720との間に配置され、第1係止部71、710及び第2係止部72、720は、互いに相対移動可能に形成され、スプリング44の係止状態は、初期位置にある入力部材140がバルブボディ130に対して相対移動することに伴い、スプリング44が第1係止部71、710に係止されている第1状態から、スプリング44が第2係止部72、720に係止されている第2状態に切り替わる。【選択図】図3


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    Title :

    NEGATIVE PRESSURE TYPE BOOSTER


    Additional title:

    負圧式倍力装置


    Contributors:

    Publication date :

    2021-01-14


    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 / F16F SPRINGS , Federn / F16J Kolben , PISTONS



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