JPH0371960U

JPH0371960U -

Info

Publication number: JPH0371960U
Application number: JP12844789U
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２ａ図は第１図におけるチ
エツク弁の負圧式倍力装置の非作動及び通常作動
時における状態を示す拡大断面図、第２ｂ図は第
１図におけるチエツク弁のバルブプランジヤがハ
ブ部材に対して出力ロツド側へ所定量以上相対移
動した時の状態を示す拡大断面図、第２ｃ図は第
１図におけるチエツク弁のバルブプランジヤがハ
ブ部材に対して入力ロツド側へ所定量以上相対移
動した時の状態を示す拡大断面図、第３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、第４図は本
考案に係わる負圧式倍力装置の弁手段の他の実施
例を示す要部断面図である。１０……ハウジング、２０……パワーピストン
、２１……ハブ部材、２１ｇ……内孔段部、３０
……バルブ機構、３１……バルブプランジヤ、３
１Ａ……前方プランジヤ、３１Ｃ……後方プラン
ジヤ、３１ａ……肩部、４０……プツシユロツド
（入力ロツド）、７０……オペレーシヨンロツド
（出力ロツド）、９０……隔壁、９１……ダイア
フラム、９２……絞り通路、９５……チエツク弁
（弁手段）、９６……弁体、９６ａ……内周弁部
、９６ｂ……外周弁部、９７……スプリング、Ｒ
１……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. 2a shows the state of the check valve negative pressure booster in Fig. 1 in non-operation and normal operation. 2b is an enlarged sectional view showing the state when the valve plunger of the check valve in FIG. 1 has moved relative to the hub member by more than a predetermined amount toward the output rod, and FIG. 2c is an enlarged sectional view of the valve plunger in FIG. 1. Figure 3 is an enlarged cross-sectional view showing the state when the valve plunger of the check valve has moved relative to the hub member by more than a predetermined amount toward the input rod.
FIG. 4 is a graph showing temporal changes in input/output characteristics obtained by the negative pressure booster shown in the figure, and FIG. FIG. DESCRIPTION OF SYMBOLS 10... Housing, 20... Power piston, 21... Hub member, 21g... Inner hole step part, 30
... Valve mechanism, 31 ... Valve plunger, 3
1A...Front plunger, 31C...Rear plunger, 31a...Shoulder, 40...Push rod (input rod), 70...Operation rod (output rod), 90...Bulkhead, 91...Diaphragm, 92 ... Throttle passage, 95 ... Check valve (valve means), 96 ... Valve body, 96a ... Inner circumference valve section, 96b ... Outer circumference valve section, 97 ... Spring, R
1... constant pressure chamber, R2... variable pressure chamber, R4... pressure chamber.

Claims

[Scope of utility model registration request]

The inside of the housing is divided into at least one set of a variable pressure chamber and a constant pressure chamber by a power piston, 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 peripheral part is hermetically fixed to the power piston, and the inner peripheral part is fixed to the power piston. A partition wall is airtightly fixed to the valve plunger or the output rod of the valve mechanism, and the pressure of the constant pressure chamber is always applied to the constant pressure chamber side of the partition wall, and the pressure is applied to the variable pressure chamber side of the partition wall. A chamber is formed, the pressure chamber and the variable pressure chamber are communicated through a throttle passage, and the amount of relative movement of the valve plunger with respect to the power piston is adjusted from its inoperative position between the pressure chamber and the variable pressure chamber. A negative pressure booster characterized in that a valve means is provided for communicating the pressure chamber and the variable pressure chamber when the pressure exceeds a predetermined amount.