JPH0194165U

JPH0194165U -

Info

Publication number: JPH0194165U
Application number: JP19127587U
Authority: JP
Priority date: 1987-12-16
Filing date: 1987-12-16
Publication date: 1989-06-21
Also published as: JPH0353959Y2

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図は同負圧ブースタにおける制御
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、３
８……弁ピストン、３８ａ……環状溝、４０_１…
…第１弁座、４０_２……第２弁座、４１……弁体
、６０……かしめ個所、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 side view showing a state immediately before the negative pressure booster returns to a resting state after completing its operation, and FIG. 5 is an explanatory view of the operation of the control valve in the negative pressure booster. 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 a boss portion, 25...Valve cylinder, 30...
...First port, 31...Second port, 32...Control valve, 33...Atmospheric inlet, 35...Input rod, 3
8... Valve piston, 38a... Annular groove, 40 ₁ ...
...first valve seat, 40 ₂ ... second valve seat, 41 ... valve body, 60 ... caulking point, 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. 1st
A valve seat, a second valve seat formed at the rear end of the valve piston that is slidably fitted into the valve cylinder, and the first valve seat is biased toward the seating direction of the first and second valve seats. When seated on the second valve seat and separated from the second valve seat, the second port is communicated with the atmosphere, and when seated on the second valve seat and separated from the first valve seat, the second port is communicated with the valve body that communicates between the first and second ports. An annular groove is formed in the middle part of the valve piston, and the opening end of the second port faces the control valve, and by caulking the bottom wall of the annular groove, the valve piston is fitted into the central part of the groove. A negative pressure booster coupled to the front end of an input rod, characterized in that a tapered air rectifying member whose outer diameter decreases toward the second valve seat is fitted in an annular groove in the middle part of the valve piston. Negative pressure booster.