JPS6062363U

JPS6062363U - Tandem type brake booster for vehicles

Info

Publication number: JPS6062363U
Application number: JP15668483U
Authority: JP
Inventors: 理治西井
Original assignee: アイシン精機株式会社
Priority date: 1983-10-07
Filing date: 1983-10-07
Publication date: 1985-05-01
Also published as: JPH032451Y2

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 the drawing]

第１図は本考案の一実施例の縦断面図、第２図は第１図
中の■−■線断面図、第３図は従来装置を示す断面図で
ある。１１・・・ハウジンク、１２・・・フロントシェル、１
３・・・リヤシェル、１４・・・固定壁、１４　ａ・・
・フロン　　　゛ト部材、１４ｂ・・・リヤ部材、１５
・・・可動ハブ、１６・・・フロント可動壁、１７・・
・リヤ可動壁、３１・・・円筒部材。FIG. 1 is a longitudinal cross-sectional view of an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line ■--■ in FIG. 1, and FIG. 3 is a cross-sectional view showing a conventional device. 11...Housing, 12...Front shell, 1
3... Rear shell, 14... Fixed wall, 14 a...
・Front member, 14b...Rear member, 15
...Movable hub, 16...Front movable wall, 17...
-Rear movable wall, 31...Cylindrical member.

Claims

[Scope of utility model registration request]

The inside of the housing is made up of a pair of front shells and a palm shell made of steel plates, and a movable 7% block made of resin passes through a fixed wall and this fixed wall and the rear shell in an airtight and slidable manner. A front movable wall and a rear movable wall placed before and after the fixed wall and fixed to the movable hub divide the chamber into four chambers: a front constant pressure chamber, a front variable pressure chamber, a rear constant pressure chamber, and a rear variable pressure chamber. and the rear constant pressure chambers are communicated with each other and one of them is communicated with a negative pressure source, and the front variable pressure chamber and the rear variable pressure chamber are communicated with each other, so that the rear variable pressure chamber is selectively connected to the front constant pressure chamber, the rear constant pressure chamber, and the atmosphere. A tandem brake booster for a vehicle comprising a control valve built into a movable hub that communicates with the front shell, and an output member that transmits the forward force of the movable knob to the piston of a brake mask cylinder coupled to the front shell. is formed into a container shape with a large depth, while the rear shell is formed into a container shape with a small depth so that the rear shell fits into the opening of the front shell, and the fixed wall is connected to the front end of the front shell. A front member is integrally fixed to the inner surface of the front shell, and a rear member is connected to the front member, and a gap between the outer circumferential surface of the fixed wall and the inner circumferential surface of the front shell is defined as a part of the rear constant pressure chamber. A hole is formed in the fixed wall to communicate this gap with the front constant pressure chamber inside the fixed wall, and a pressure plate made of a steel plate constituting the rear movable wall has a hole surrounding the movable hub. Further, a cylindrical portion is integrally provided which penetrates the rear member of the fixed wall in an airtight and slidable manner, and a gap is formed between the inner circumferential surface of the cylindrical portion and the outer circumferential surface of the movable hub to communicate with the rear variable pressure chamber. A tandem brake booster for a vehicle, wherein a radial passage is formed in the cylindrical portion or the movable hub to communicate this gap with a front variable pressure chamber inside the fixed wall.