JPH01123766U

JPH01123766U -

Info

Publication number: JPH01123766U
Application number: JP1790688U
Authority: JP
Priority date: 1988-02-12
Filing date: 1988-02-12
Publication date: 1989-08-23
Also published as: JPH042122Y2

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、３
１…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、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 sectional side view showing the negative pressure booster immediately before it returns 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 a boss portion, 25... Valve cylinder, 30... First port, 3
1...Second port, 32...Control valve, 33...Atmospheric inlet, 35...Input rod, 38...Valve piston, 38a...
Annular groove, 40 ₁ ... first valve seat, 40 ₂ ... second valve seat,
41... Valve body, 60... Caulking location, 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. The valve cylinder is provided with a first port that communicates the inside of the valve cylinder with the negative pressure chamber and a second port that connects the inside of the valve cylinder with the working chamber. 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 surrounded by the first valve seat, and the seating direction of the first and second valve seats. When seated on the first 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 first and second ports are opened. A control valve consisting of a valve body that communicates with the valve piston is accommodated, and an annular groove is formed in the middle part of the valve piston, from which the open end of the second port faces, and by caulking the bottom wall of this annular groove, the valve piston and , in a negative pressure booster in which the front end of the input rod is connected to the center of the booster,
The second valve seat is formed into a tapered shape in which the outer diameter decreases toward the valve body and the generatrix curves toward the axis of the valve piston. A negative pressure booster characterized by being fitted with a tapered air rectifying member that decreases toward the valve seat.