JPH01149865U

JPH01149865U -

Info

Publication number: JPH01149865U
Application number: JP4705388U
Authority: JP
Priority date: 1988-04-07
Filing date: 1988-04-07
Publication date: 1989-10-17
Anticipated expiration: 2003-04-07
Also published as: JP2514481Y2

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、第７図は制御弁
における弁体の縦断面図である。Ｂ……負圧ブースタ、ｆ……第２弁座の座面、
_０……座面ｆの母線中心、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、４０_１……第１弁座、４０
_２……第２弁座、４１……弁体。 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. The operation explanatory diagram, FIG. 7, is a longitudinal sectional view of the valve body in the control valve. B... Negative pressure booster, f... Seating surface of the second valve seat,
₀ ...Center of generatrix of seat f, 1...Booster shell, 2a, 3a...Negative pressure chamber, 2b, 3b...Working chamber, 4, 6...Front booster piston, 10...As boss part Piston boss, 25...Valve cylinder, 30
...First port, 31...Second port, 32...
Control valve, 33...Atmospheric inlet, 35...Input rod,
38... Valve piston, 40 ₁ ... First valve seat, 40
₂ ...Second valve seat, 41...Valve body.

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. a first annular 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 first and second valve seats. 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 and separated from the first valve seat. Then, in a negative pressure booster that houses a control valve consisting of a hollow cylindrical elastic valve body that communicates between the first and second ports, and connects an input rod that passes through the hollow part of the valve body to a valve piston. A negative pressure booster, characterized in that the seating surface of the second valve seat relative to the valve body is a convex curved surface formed by the generatrix of an arc having its center at a point a certain distance from the axis of the valve piston.