JPS5999860U

JPS5999860U - Brake booster

Info

Publication number: JPS5999860U
Application number: JP20203882U
Authority: JP
Inventors: 大見　厚志
Original assignee: アイシン精機株式会社
Priority date: 1982-12-24
Filing date: 1982-12-24
Publication date: 1984-07-05
Also published as: JPH0111576Y2

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図は木考案に係るブレーキ倍力装置の一実施例を示
す縦断面図、第２図は同装置における後方シェルの斜視
図、第３図は同装置におけるダイアフラムピストンのダ
イアフラムの斜視図、第４図は同装置における係止用リ
ングの斜視図である。符号の説明、１０・・・・・・密閉シェル、１１・・・
・・・前方シェル、１２・・・・・・後方シェル、１２
ｂ・・・・・・小径筒部、１２Ｃ・・・・・・テーパ部
、１２ｄ、１２ｅ・・・・・・環状凹所、２０．３０・
曲佼′イアフラムピストン、２１．２２．３１・・・・
・・ピストンホゾ−１２４，−３４・・・・・・ダイア
フラム、２４ａ、３４ａ・・曲外周ビード部、４０・・
・・・・、切換弁機構、Ｒ１，Ｒ３・・・・・・定圧室
、Ｒ２・・・・・・変圧室。Fig. 1 is a longitudinal sectional view showing an embodiment of the brake booster according to the wooden device, Fig. 2 is a perspective view of the rear shell in the same device, Fig. 3 is a perspective view of the diaphragm of the diaphragm piston in the same device, FIG. 4 is a perspective view of a locking ring in the device. Explanation of symbols, 10... Sealed shell, 11...
...Front shell, 12...Rear shell, 12
b... Small diameter cylindrical part, 12C... Taper part, 12d, 12e... Annular recess, 20.30.
Curca' iaphragm piston, 21.22.31...
...Piston tenon-124, -34...Diaphragm, 24a, 34a...Curved outer peripheral bead portion, 40...
..., switching valve mechanism, R1, R3... constant pressure chamber, R2... variable pressure chamber.

Claims

[Scope of utility model registration request]

A plurality of diaphragm pistons are disposed coaxially in the front and back direction within a sealed shell formed by airtightly fitting opposite ends of a front shell and a rear shell that face each other, and are operatively connected. Each of the outer circumferential bead portions of the diaphragm in each diaphragm piston is hermetically locked to the inner circumferential wall of the sealing shell, and the sealing shell C is selectively connected to a constant pressure chamber to which negative pressure is applied, an identified pressure chamber, and the atmosphere. In a brake booster which is divided into variable pressure chambers that communicate with each other, and which moves at least the front diaphragm piston of each of the diaphragm pistons axially forward due to the pressure difference between the two chambers, either of the shells One of the shells is formed into a pillow-shaped shape that expands toward the opening end of the other shell so that the peripheral edge of the opening reaches the peripheral edge of the opening end of the other shell and is fitted into the opening of the other shell. An annular recess into which each of the outer peripheral bead portions of each of the diaphragms is locked is provided at a radially intermediate portion between the end peripheral edge portion and its inner peripheral wall portion, and each of the outer peripheral bead portions of each of the diaphragms is fitted into each of these annular recesses. A brake booster characterized by airtightly locking each part.