JPH0445171U

JPH0445171U -

Info

Publication number: JPH0445171U
Application number: JP8779990U
Authority: JP
Priority date: 1990-08-22
Filing date: 1990-08-22
Publication date: 1992-04-16

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図は第３図の−線矢視
図、第５図は第１図の−線断面図、第６図は
第５図の−線断面図、第７図は同負圧ブース
タの作動状態を示す部分縦断側面図である。１……ブースタシエル、１ｃ……隔壁板、２…
…前部シエル室、２ａ……前部負圧室、２ｂ……
前部作動室、３……後部シエル室、３ａ……後部
負圧室、３ｂ……後部作動室、４……前部ブース
タピストン、５……前部ダイヤフラム、５ａ……
内周ビード、６……後部ブースタピストン、７…
…後部ダイヤフラム、７ａ……内周ビード、１０
……ピストンボス、１２……スリーブ、１４……
第１ポート、１５……第２ポート、１５ａ……第
１通路、１５ｂ，１５ｃ……第２通路、２５……
弁筒、３２……制御弁、３５……入力杆、５３…
…出力杆。 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 sectional view taken along the - line in Fig. 3, Fig. 5 is a sectional view taken along the - line in Fig. 1, Fig. 6 is a sectional view taken along the - line in Fig. 5, and Fig. 7 is a sectional view taken along the - line in Fig. 5. FIG. 3 is a partially vertical side view showing an operating state. 1... Booster shell, 1c... Partition plate, 2...
...Front shell chamber, 2a...Front negative pressure chamber, 2b...
Front working chamber, 3... Rear shell chamber, 3a... Rear negative pressure chamber, 3b... Rear working chamber, 4... Front booster piston, 5... Front diaphragm, 5a...
Inner circumferential bead, 6... Rear booster piston, 7...
...Rear diaphragm, 7a...Inner peripheral bead, 10
...Piston boss, 12...Sleeve, 14...
1st port, 15...2nd port, 15a...1st passage, 15b, 15c...2nd passage, 25...
Valve cylinder, 32...Control valve, 35...Input rod, 53...
...output rod.

Claims

[Claims for Utility Model Registration] A partition plate 1c is fixed to the booster shell 1 to partition the inside thereof into a front shell chamber 2 and a rear shell chamber 3, and the front shell chamber 2 is divided into a front negative pressure chamber on the front side. 2a and a front working chamber 2b on the rear side; a front diaphragm 5 superimposed on the rear surface; and a rear shell chamber 3 and a rear negative pressure chamber 3 on the front side.
The rear booster piston 6 and the rear diaphragm 7, which are superimposed on the rear surface, are connected to the front of the piston boss 10 that airtightly penetrates the partition wall plate 1c and is connected to the output rod 53. An input rod 35 that is movable back and forth is provided in a valve cylinder 25 that is fixed to the rear end of the piston boss 10 and is slidably supported on the rear wall of the booster shell 1. The first port 1 is bifurcated into two working chambers 2b and 3b according to the forward and backward movement of the rod 35.
4, and a control valve 32 that communicates with the atmosphere through the first port 14 and the bifurcated second port 15 with both negative pressure chambers 2a, 3a. In the booster, a first passage 15a passes through the second port 15 in the axial direction inside the piston boss 10 and communicates with the front negative pressure chamber 2a, and a first passage 15a branches outward in the radial direction from an intermediate part of the first passage 15a. The opening of the second passages 15b, 15c to the rear negative pressure chamber 3a is formed along the front surface of the rear booster piston 6. A tandem negative pressure booster featuring: