JPS6337467U

JPS6337467U -

Info

Publication number: JPS6337467U
Application number: JP13111686U
Authority: JP
Priority date: 1986-08-29
Filing date: 1986-08-29
Publication date: 1988-03-10

Description

[Brief explanation of the drawing]

第１図は本考案の実施例を示す負圧式倍力装置
の側断面図、第２図は第１図の要部の拡大図、第
３図は第２図のＡ矢視図、第４図及び第５図は従
来のプレートとピストンとの間の夫々異なる例の
シール材の取付け状態を示す側断面図である。図の主要部分の説明、１，２……ハウジング、
４……ダイアフラム、４ａ……プレート、５……
ピストン、５ａ……カツプシール、５ｂ……大径
部、５ｃ……背圧逃し溝、６……負圧室、７……
変圧室、１０……プツシユロツド、１１……バル
ブプランジヤ、１２……コントロールバルブ、１
６，１７……通孔、２０……キー、２６……円筒
部、２７……屈曲部、２８……カシメ。 Fig. 1 is a side sectional view of a negative pressure booster showing an embodiment of the present invention, Fig. 2 is an enlarged view of the main parts of Fig. 1, Fig. 3 is a view taken in the direction of arrow A in Fig. 2, and Fig. 4 5 and 5 are side sectional views showing different examples of attachment of sealing materials between a conventional plate and a piston. Explanation of the main parts of the diagram, 1, 2...housing,
4...Diaphragm, 4a...Plate, 5...
Piston, 5a... Cup seal, 5b... Large diameter portion, 5c... Back pressure relief groove, 6... Negative pressure chamber, 7...
Variable pressure chamber, 10... Push rod, 11... Valve plunger, 12... Control valve, 1
6, 17...Through hole, 20...Key, 26...Cylindrical portion, 27...Bending portion, 28...Crimping.

Claims

[Scope of utility model registration request]

A negative pressure booster has a valve plunger inside the piston that moves left and right by the movement of a push rod linked to the brake pedal, and has a built-in control valve that controls the opening and closing of a negative pressure chamber and a variable pressure chamber according to the pedal force. The center opening of a plate connected to the center of a diaphragm that divides the device into a negative pressure chamber and a variable pressure chamber is airtightly fixed to the large diameter portion of the piston via a sealing material. A plurality of back pressure relief grooves are formed on the outer circumferential surface of the diameter portion, and the sealing material is a cup seal, and the cup seal bends when the back pressure in the negative pressure chamber increases and releases the negative pressure through the back pressure relief groove. A negative pressure booster characterized in that a chamber and a variable pressure chamber are communicated with each other.