JPH0371962U

JPH0371962U -

Info

Publication number: JPH0371962U
Application number: JP12844989U
Authority: JP
Priority date: 1989-10-31
Filing date: 1989-10-31
Publication date: 1991-07-19

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図は第１図に示した負圧
式倍力装置によつて得られる入出力特性の時間的
変化を示したグラフである。１０……ハウジング、２０……パワーピストン
、２１……ハブ部材、３０……バルブ機構、３１
……バルブプランジヤ、３１Ａ……前方プランジ
ヤ、３１Ａ_１……プレート部、３１Ａ_３……スト
ツパ部、３１Ｂ……後方プランジヤ、４０……プ
ツシユロツド（入力ロツド）、５０……キー、７
０……オペレーシヨンロツド（出力ロツド）、９
０……隔壁、９１……ダイアフラム、９２……絞
り通路、Ｒ１……定圧室、Ｒ２……変圧室、Ｒ４
……圧力室。 Fig. 1 is a sectional view showing an embodiment of the negative pressure booster according to the present invention, and Fig. 2 is a temporal change in input/output characteristics obtained by the negative pressure booster shown in Fig. 1. This is a graph showing. DESCRIPTION OF SYMBOLS 10... Housing, 20... Power piston, 21... Hub member, 30... Valve mechanism, 31
...Valve plunger, 31A...Front plunger, 31A ₁ ...Plate part, 31A ₃ ...Stopper part, 31B...Rear plunger, 40...Push rod (input rod), 50...Key, 7
0...Operation rod (output rod), 9
0... Partition wall, 91... Diaphragm, 92... Throttle passage, R1... Constant pressure chamber, R2... Variable pressure chamber, R4
...Pressure chamber.

Claims

[Scope of utility model registration request]

The inside of the housing is divided by a power piston into at least one set of a variable pressure chamber and a constant pressure chamber, and the differential pressure between the variable pressure chamber and the constant pressure chamber is controlled by the operation of a valve mechanism incorporated in the power piston and interlocked with an input rod. In the negative pressure booster, in which the operating force applied to the input rod is assisted by the power piston and transmitted to the output rod, the outer periphery is hermetically fixed to the power piston, and the inner periphery is secured to the key. and a stopper portion that is airtightly fixed to the valve plunger of the valve mechanism that is fitted and inserted into the power piston so as to be movable relative to the power piston by a predetermined amount, and that can come into contact with the power piston before the valve plunger moves relative to the power piston by a predetermined amount. A partition wall is provided, and the pressure of the constant pressure chamber is always applied to the constant pressure chamber side of the partition wall, and a pressure chamber is formed on the variable pressure chamber side, and the pressure chamber and the variable pressure chamber are connected. A negative pressure booster characterized by communicating through a throttle passage.