JPH02123463U

JPH02123463U -

Info

Publication number: JPH02123463U
Application number: JP3170589U
Authority: JP
Priority date: 1989-03-21
Filing date: 1989-03-21
Publication date: 1990-10-11

Description

[Brief explanation of drawings]

第１図は本考案に従つたタンデム型負圧式倍力
装置の一実施例を示す断面図、第２図は本考案の
変形例を示す断面図である。１０……タンデム型負圧式倍力装置、１１……
ハウジング、１２……フロントシエル、１３……
リヤシエル、１４……固定壁、２０……フロント
可動壁、２１……ハブ部材、２１ｂ……側壁、２
２…プレート、２３……ダイアフラム、３０……
リヤ可動壁、３１……ハブ部材、３１ａ……内孔
、３１ｃ……シート部、３２……プレート、３３
……ダイアフラム、４０……制御弁機構、４１…
…バルブプランジヤ、４１ａ……後端シート部、
４２……コントロールバルブ、４３……スプリン
グ、５０……プツシユロツド、６０……キー、７
０……ケース、１７０……ケース、ｒａ_１……フ
ロント変圧室、ｒａ_２……フロント定圧室、ｒｂ
_１……リヤ変圧室、ｒｂ_２……リヤ定圧室。 FIG. 1 is a sectional view showing an embodiment of a tandem type negative pressure booster according to the present invention, and FIG. 2 is a sectional view showing a modification of the present invention. 10... Tandem type negative pressure booster, 11...
Housing, 12...Front shell, 13...
Rear shell, 14...Fixed wall, 20...Front movable wall, 21...Hub member, 21b...Side wall, 2
2...Plate, 23...Diaphragm, 30...
Rear movable wall, 31... hub member, 31a... inner hole, 31c... seat portion, 32... plate, 33
...Diaphragm, 40...Control valve mechanism, 41...
... Valve plunger, 41a ... Rear end seat part,
42...Control valve, 43...Spring, 50...Push rod, 60...Key, 7
0...Case, 170...Case, ra ₁ ...Front transformation chamber, ra ₂ ...Front constant pressure chamber, rb
₁ ...Rear variable pressure chamber, _rb2 ...Rear constant pressure chamber.

Claims

[Scope of utility model registration request]

The interior of a housing formed by combining a front shell and a rear shell includes a fixed wall, a front movable wall disposed in front of the fixed wall, and a front movable wall disposed behind the fixed wall, so that the back and forth movement of the housing is controlled by the rear shell and the fixed wall. The front constant pressure chamber, front variable pressure chamber, rear constant pressure chamber, and rear variable pressure chamber are divided into four chambers by a rear movable wall guided by the wall, and the front constant pressure chamber and rear constant pressure chamber are constantly connected to a negative pressure source. a valve plunger that is movable in the axial direction in conjunction with a pedal; a valve plunger that opens and closes communication between the front variable pressure chamber, the rear variable pressure chamber, and the atmosphere between the rear end seat portion of the valve plunger and the rear movable valve plunger; A control valve that opens and closes communication between the front constant pressure chamber, the rear constant pressure chamber, the front variable pressure chamber, and the rear variable pressure chamber between a seat portion formed in a wall, and a control valve that is normally located behind the valve plunger. comprising a biasing means for biasing the control valve and the valve plunger to seat on the end seat portion, and selecting the front variable pressure chamber and the rear variable pressure chamber as the front constant pressure chamber, the rear constant pressure chamber, and the atmosphere; a control valve mechanism that communicates with the front movable wall; a case member disposed within the front constant pressure chamber that sandwiches the front movable wall between the front movable wall and the rear movable wall; A tandem negative pressure booster comprising a reaction mechanism that transmits a reaction force to a piston of a master cylinder coupled to the front shell through a member and also transmits a part of the reaction force from the piston to the control valve mechanism. . A tandem negative pressure booster, characterized in that the valve plunger of the control valve mechanism is slidably supported by the rear movable wall.