| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to suppress excessive increase of a brake force with respect to input to a brake pedal.SOLUTION: An air pressure type booster device is configured from: a poppet valve 14 in which a valve mechanism 13, which is provided between a small diameter cylindrical part 6B of a valve body 6 and an input rod 12, is movably attached to the small diameter cylindrical part 6B of the valve body 6; an annular contact part 21A which is formed in a plunger body 21 of a plunger 20 and is seated on and separated from the poppet valve 14, thereby performing communication and interception between a transformation chamber B and ambient air; a stepped cylindrical movable sheet member 29 which is movably guided to the valve body 6 and is seated on and separated from the poppet valve 14, thereby performing communication and interception between a negative pressure chamber A and the transformation chamber B; and a transmission member 31 so disposed as to have one end which contacts the movable sheet member 29 and the other end which surrounds a stepped piston 22 of the plunger 20 and can contact a reaction disk 27. |
