JPH0299061U

JPH0299061U -

Info

Publication number: JPH0299061U
Application number: JP734289U
Authority: JP
Priority date: 1989-01-25
Filing date: 1989-01-25
Publication date: 1990-08-07

Description

[Brief explanation of the drawing]

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図は第１図における本考
案の要部の拡大図、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１コイルスプリン
グ（第２付勢手段）、３０……スプリング、３１
……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 an enlarged view of the main part of the present invention in Fig. 1, and Fig. 3 is a cross-sectional view showing an embodiment of the negative pressure booster according to the present 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 (
(first biasing means), 29b...first coil spring (second biasing means), 30...spring, 31
...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. It has a rolling part having a flexible cylindrical part and a flange part, and is fixed to the cylindrical part of the power piston by a retainer that locks a second biasing means that biases the push rod toward the brake pedal. and a control valve whose outer periphery is airtightly sandwiched 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 biasing 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 in the power piston, the inner peripheral part of the retainer is aligned with the inner surface of the flange part of the rolling part and the flange is moved inwardly. A negative pressure booster, characterized in that the device extends to the inner peripheral edge of the flange portion and is fixed to the inner surface of the flange portion.