JPH0370566U

JPH0370566U -

Info

Publication number: JPH0370566U
Application number: JP13341289U
Authority: JP
Priority date: 1989-11-16
Filing date: 1989-11-16
Publication date: 1991-07-16

Description

[Brief explanation of drawings]

第１図は本考案に従つた負圧式倍力装置の一実
施例を示す断面図、第２図は本考案の変形実施例
を示す一部断面図、第３図は本考案に従つた負圧
式倍力装置の入力荷重と出力荷重との関係を示す
特性図である。１０……負圧式倍力装置、１１……ボデイ、１
４……パワーピストン、１５……ダイアフラム、
１６……定圧室、１７……変圧室、１８……ピス
トンボデイ、１８ａ……筒状部、１８ｂ……シー
ト面、１９……プレツシヤプレート、２０……プ
ツシユロツド、２１……バルブプランジヤ、２１
ａ……シート、２２……コントロールバルブ、２
２ａ……シール面、２２ｂ……ローリング部、２
２ｂ１……筒部、２２ｂ２……フランジ部、２３
……制御弁、２９ａ……第１コイルスプリング（
第１付勢手段）、２９ｂ……第２コイルスプリン
グ（第２付勢手段）、３０……スプリング、３１
ａ……リテーナ、３１ｂ……第２リテーナ。 Fig. 1 is a sectional view showing an embodiment of the negative pressure booster according to the present invention, Fig. 2 is a partial sectional view showing a modified embodiment of the present invention, and Fig. 3 is a sectional view showing an embodiment of the negative pressure booster according to the invention. It is a characteristic diagram which shows the relationship between the input load and output load of a pressure type booster. 10... Negative pressure booster, 11... Body, 1
4...Power piston, 15...Diaphragm,
16... Constant pressure chamber, 17... Variable pressure chamber, 18... Piston body, 18a... Cylindrical part, 18b... Seat surface, 19... Pressure plate, 20... Push rod, 21... Valve plunger, 21
a... Seat, 22... Control valve, 2
2a... Seal surface, 22b... Rolling part, 2
2b1...Cylinder part, 22b2...Flange part, 23
...Control valve, 29a...First coil spring (
29b...second coil spring (second biasing means), 30...spring, 31
a...retainer, 31b...second retainer.

Claims

[Scope of utility model registration request]

A power piston and a diaphragm that divide the inside of the housing into a variable pressure chamber and a constant pressure chamber where negative pressure always acts, a valve plunger that is slidably fitted to the power piston and interlocks with a brake pedal via a push rod, and the valve. Atmospheric pressure and negative pressure are constantly applied to the sealing surface that normally contacts the rear end of the plunger by the first biasing means, and the inner and outer surfaces of the sealing surface, respectively, and expands and contracts in the axial direction in response to the axial movement of the push rod. The retainer has a rolling part having a flexible cylindrical part and a flange part, and is fixed to the cylindrical part of the power piston and locks a second biasing means that biases the push rod toward the brake pedal. and a control valve whose outer periphery is airtightly held between the cylindrical part, the control valve of the control valve is interlocked with the brake pedal together with the valve plunger by the first biasing means, and the control valve is interlocked with the brake pedal together with the valve plunger by the first urging means, The surface contacts the seat surface of the power piston to cut off communication between the constant pressure chamber and the variable pressure chamber, and the rear end of the valve plunger and the sealing surface of the control valve are separated to introduce atmospheric air into the variable pressure chamber. In the negative pressure booster that generates a pressure difference between the two chambers and generates an operating force to the power piston, the retainer is airtightly fixed to the inner periphery of the cylindrical part, and the retainer is fixed to the inner periphery of the cylindrical part. a first retainer extending to the inner circumferential edge of the flange of the rolling portion on the outer surface of the control valve; and a first retainer fixed to the first retainer to connect the outer circumference of the control valve and the flange to the first retainer. A negative pressure booster comprising a second retainer airtightly held between the retainers.