JPH0215566U

JPH0215566U -

Info

Publication number: JPH0215566U
Application number: JP9362788U
Authority: JP
Priority date: 1988-07-15
Filing date: 1988-07-15
Publication date: 1990-01-31
Also published as: JPH0437011Y2

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倍力休止状態での縦
断側面図、第１Ａ図は第１図のＡ―Ａ線断面図、
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、６０……防音カバー、６１……通
気路、６２……リブ。 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 boosting rest state, FIG. 1A is a sectional view taken along line A--A in FIG. 1, and FIG.
Figures 2 and 3 are the lines and lines in Figure 1.
A line sectional view and FIG. 4 are partial vertical side views showing a state immediately before the negative pressure booster finishes its operation and returns to a resting state. 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 tube, 26a... End wall, 32... Control valve, 33... Atmospheric inlet, 35... Input rod, 46...
...stopper plate, 60...soundproof cover, 61...ventilation passage, 62...rib.

Claims

[Scope of utility model registration request]

The booster shell has a booster piston partitioned into a front negative pressure chamber and a rear working chamber, and a booster piston urged in the backward direction by a return spring;
In the valve cylinder connected to the rear end of this 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 converted into a negative pressure chamber and an atmosphere inlet at the rear end of the valve cylinder. A control valve for communication switching 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, the input rod has 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 the end wall and restrict the retraction limit of the input rod. The forward-facing opening of a cup-shaped soundproof cover attached to the input rod is loosely fitted into the input rod, and the shaft is placed opposite the outer circumferential surface of the covering tube to define a plurality of groove-shaped ventilation passages on the inner circumferential surface of the soundproof cover. A negative pressure booster characterized by having a plurality of protruding ribs extending in the direction.