JPH0268260U

JPH0268260U -

Info

Publication number: JPH0268260U
Application number: JP3939389U
Authority: JP
Priority date: 1988-07-01
Filing date: 1989-04-03
Publication date: 1990-05-23
Anticipated expiration: 2003-10-18
Also published as: JPH0541103Y2

Description

[Brief explanation of the drawing]

第１図ないし第７図は本考案の第１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倍
力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
の要部拡大図、第６図は第１図の―線断面図
、第７図はフイルタケースの斜視図、第８図は本
考案の第２実施例を示す負圧ブースタの要部の縦
断面図である。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……ブースタピストン、２５……弁筒、２
６……被覆筒、２６ａ……端壁、３２……制御弁
、３３……大気導入口、３５……入力杆、４６…
…ストツパ板、５４……通気孔、５８……フイル
タケース、５８ａ……フランジ、６２……濾過室
、６３……エアフイルタ、６４……支持壁。 1 to 7 show the first embodiment of the present invention, in which FIG. 1 is a vertical cross-sectional side view of the tandem negative pressure booster in the boosting rest state, and FIGS. 2 and 3 are the first embodiment of the present invention. 4 is a partial vertical sectional side view showing the state of the negative pressure booster immediately before returning to the rest state after it has finished operating, and FIG. 5 is an enlarged view of the main part of FIG. 1. FIG. 6 is a sectional view taken along the line -- in FIG. 1, FIG. 7 is a perspective view of the filter case, and FIG. 8 is a longitudinal sectional view of the essential parts of a negative pressure booster showing a second embodiment of the present invention. B...Negative pressure booster, 1...Booster shell,
2a, 3a... negative pressure chamber, 2b, 3b... working chamber,
4, 6...Booster piston, 25...Valve cylinder, 2
6... Covering cylinder, 26a... End wall, 32... Control valve, 33... Atmospheric inlet, 35... Input rod, 46...
...stopper plate, 54...ventilation hole, 58...filter case, 58a...flange, 62...filtration chamber, 63...air filter, 64...support wall.

Claims

[Claims for Utility Model Registration] (1) The booster shell is divided into a negative pressure chamber on the front side and an operating chamber on the rear side, and houses a booster piston that is urged in the backward direction by a return spring. In the valve cylinder connected to the rear end of the booster piston, there is an input rod that can move back and forth, and according to the back and forth movement of this input rod, the working chamber is communicated with the negative pressure chamber and the atmosphere inlet at the rear end of the valve cylinder. A control valve to be switched is disposed, and a covering cylinder that covers the valve cylinder and slidably supports the outer circumferential surface of the booster shell via a bearing protrudes from the rear surface of the booster shell. , in a negative pressure booster in which an input rod forms an annular end wall through which the input rod passes, and a stopper plate is provided on the input rod to abut against the inner surface of this end wall and restrict the retraction limit of the input rod, the peripheral wall of the sheathing tube is A negative pressure booster, characterized in that a vent hole is provided to constantly communicate the atmosphere inlet of the valve cylinder with the atmosphere. (2) The negative pressure booster according to item (1), characterized in that an air filter that covers the ventilation hole is attached to the covering tube. (3) In the product described in paragraph (2), the air filter is housed in a cylindrical filter case surrounding a covering cylinder, and a flange formed at one end of the filter case is connected to a booster shell and a support wall that supports it. A negative pressure booster, characterized in that it is clamped between.