JPH01123767U

JPH01123767U -

Info

Publication number: JPH01123767U
Application number: JP1790788U
Authority: JP
Priority date: 1988-02-12
Filing date: 1988-02-12
Publication date: 1989-08-23

Description

[Brief explanation of the drawing]

図面は本考案の一実施例を示すもので、第１図
はタンデム型負圧ブースタの休止状態での縦断側
面図、第２図及び第３図は第１図の―線及び
―線断面図、第４図は同負圧ブースタが作動
を終えて休止状態に戻る直前の状態を示す部分縦
断側面図、第５図は第１図の制御弁周辺部拡大図
、第６図は制御弁の作動説明図である。Ｂ…負圧ブースタ、１…ブースタシエル、２ａ
，３ａ負圧室、２ｂ，３ｂ…作動室、４，６…前
部ブースタピストン、１０…ボス部としてのピス
トンボス、２５…弁筒、３０…第１ポート、３１
…第２ポート、３２…制御弁、３３…大気導入口
、３５…入力杆、３８…弁ピストン、３９…空気
整流部、４０_１…第１弁座、４０_２…第２弁座、
４１…弁体、６１…空気整流部材。 The drawings show one embodiment of the present invention, and FIG. 1 is a vertical sectional side view of a tandem negative pressure booster in a rest state, and FIGS. 2 and 3 are sectional views taken along lines - and - in FIG. 1. , Fig. 4 is a partial vertical sectional side view showing the state of the negative pressure booster immediately before returning to the rest state after completing its operation, Fig. 5 is an enlarged view of the surrounding area of the control valve in Fig. 1, and Fig. 6 is a view of the control valve. It is an operation explanatory diagram. B...Negative pressure booster, 1...Booster shell, 2a
, 3a negative pressure chamber, 2b, 3b... working chamber, 4, 6... front booster piston, 10... piston boss as boss section, 25... valve cylinder, 30... first port, 31
...Second port, 32...Control valve, 33...Air inlet, 35...Input rod, 38...Valve piston, 39...Air rectifier, 40 ₁ ...First valve seat, 40 ₂ ...Second valve seat,
41... Valve body, 61... Air rectification member.

Claims

[Scope of utility model registration request]

A negative pressure chamber and an operating chamber are respectively formed on the front and rear sides of the booster piston housed in the booster shell, and the boss portion of the booster piston has a valve cylinder that is slidably supported on the rear wall of the booster shell. A first port that connects the inside of the valve cylinder to the negative pressure chamber and a second port that connects the inside of the valve cylinder to the working chamber are provided. an annular first valve seat; an annular rib-shaped second valve seat formed at the rear end of the valve piston that is slidably fitted into the valve cylinder and surrounded by the first valve seat; When it is seated on the first valve seat and separated from the second valve seat, the second port is communicated with the atmosphere through the hollow part, and when it is seated on the second valve seat, the first A negative pressure booster that houses a control valve consisting of a hollow cylindrical valve body that communicates between a first and a second port when separated from a valve seat, and has an input rod that passes through the hollow part of the valve body coupled to a valve piston. A tapered air rectifying portion protruding from the inner peripheral side of the annular rib-shaped second valve seat toward the hollow portion of the valve body is connected to the rear end of the valve piston. A negative pressure booster characterized in that the second port is arranged so that one side of the air rectifying section faces an open end of the second port when the air rectifying section is separated from the second port.