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    • 3. 发明专利
    • BRAKE BOOSTER
    • JPH05229419A
    • 1993-09-07
    • JP7228292
    • 1992-02-21
    • JIDOSHA KIKI CO
    • ISHII MASAOWATANABE MAKOTO
    • B60T13/56B60T13/563F16J3/04
    • PURPOSE:To prevent the expansion of bellows and prevent the drop of output by providing stoppers for preventing the shifting of reinforcing rings at the periphery of bellows. CONSTITUTION:In case of making a brake booster function as an automatic brake, air is introduced into the inner space of bellows 13 by operating a solenoid valve 16. Thereupon, pressure difference occurs between fixed pressure chambers A and C and changed pressure chambers B and D, and output is gotten from an output shaft 24. At this time, the inner space A' gets at high pressure by the fixed pressure chamber A outside it, and the bellows 13 seeks to expand in radial direction. To suppress this expansion, reinforcing rings 27 are fit in the troughs 13a of the bellows 13, and further stoppers 23 of circular projections are made at the inclines in front and in rear of the trough 13a. Therefore, the reinforcing rings 27 are prevented from shifting to the adjacent troughs 13a, consequently the volume expansion of the inner space A' is suppressed, and the output drop as an automatic brake is prevented.