JPS60161663U

JPS60161663U - brake booster

Info

Publication number: JPS60161663U
Application number: JP5020584U
Authority: JP
Inventors: 井上　義道
Original assignee: 自動車機器株式会社
Priority date: 1984-04-05
Filing date: 1984-04-05
Publication date: 1985-10-26

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図は従来のブレーキブースタの縦断面図、第２図は
第１図に示すブーツの後端部の拡大断面図、第３図は従
来のブレーキブースタの騒音測定結果を示すグラフ図で
ある。また第４図は本考案　　　　′の実施例を示す第
２図と同様の断面図、第５図および第６図は本考案に係
るブレーキブースタの騒音測定結果を示すグラフ図、第
７図は丸み部の半径と笛吹き音の大きさとの関係を示す
グ？フ図である。４・・・ハウジング、７，８・・・定圧室、９．１０・
・・変圧室、１６．　１７・・・パワーピストン、１８
・・・バルブボディ、１９・・・出力ロット、２２・・
・第１の開閉弁、２３・・・第２の開閉弁、２８・・・
入力ロンド、　　。４０・・・ブーツ、４３・・・大気吸入！、４８・・・
丸み　　　　′部。Fig. 1 is a longitudinal sectional view of a conventional brake booster, Fig. 2 is an enlarged sectional view of the rear end of the boot shown in Fig. 1, and Fig. 3 is a graph showing noise measurement results of the conventional brake booster. . Fig. 4 is a sectional view similar to Fig. 2 showing an embodiment of the present invention, Figs. 5 and 6 are graphs showing the noise measurement results of the brake booster according to the present invention, and Fig. 7 is a rounded Gu? This is a diagram. 4... Housing, 7, 8... Constant pressure chamber, 9.10.
...Transformer room, 16. 17...Power piston, 18
...Valve body, 19...Output lot, 22...
-First on-off valve, 23...Second on-off valve, 28...
Input Rondo, . 40...Boots, 43...Atmosphere inhalation! ,48...
Rounded part.

Claims

[Scope of utility model registration request]

A power piston is disposed in a sealed housing so as to be able to reciprocate, and an output rond that slidably passes through the front wall of the Hauping is connected to the front end of the power piston Q, and the housing is connected to the rear end of the power piston Q. A cylindrical part that slidably penetrates the rear wall is integrally formed, and a constant pressure chamber into which a predetermined negative pressure is constantly introduced to both the front and rear sides of the power piston; The constant pressure chamber or the variable pressure chamber selectively communicated with the atmosphere is formed by a valve mechanism disposed in the cylindrical portion, and the valve mechanism is controlled to open and close by operating an input iron inserted into the cylindrical portion, In the brake booster, the brake booster is configured such that when the power piston moves forward, atmospheric air is sucked into the variable pressure chamber from the rear end opening of the cylindrical portion via the valve mechanism. The outer periphery of the boot is covered with a retractable boot, and the rear edge of the boot is folded inward and fitted into the rear end opening of the cylindrical part, so that the inner circumference of the folded part of the boot □ is exposed to air. forming an inlet;
and a radius of 1 on the edge of the air inlet on the inlet side of the air inlet.
．． A brake booster characterized in that a rounded portion of 5 mm or more or a chamfered portion of 1.5 myy+ or more is formed.