JPH045168U

JPH045168U -

Info

Publication number: JPH045168U
Application number: JP4649190U
Authority: JP
Priority date: 1990-04-27
Filing date: 1990-04-27
Publication date: 1992-01-17

Description

[Brief explanation of the drawing]

第１図は、本考案の実施例のタンデム型気圧式
倍力装置を示す断面図（第３図の−線矢示の
断面図）、第２図は同タンデム型気圧式倍力装置
の作動例を示す断面図、第３図は同タンデム型気
圧式倍力装置の−矢示の断面図である。３１……フロントシエル、３２……リアシエル
、３３……センタプレート、３４……ハウジング
、３５……前室、３６……後室、３７……バルブ
ボデイ、３９……マスタシリンダ、４０……オー
バハング部、４１……フロント定圧室、４２……
前部、４３……凹部、４５……リターンスプリン
グ、４８……フロント変圧室、５１……リア定圧
室、５２……リア変圧室、７６……内周面、７７
……開口部、７８……溝、Ｖ……切換弁。 Fig. 1 is a sectional view showing a tandem type pneumatic booster according to an embodiment of the present invention (a sectional view taken along the - line arrow in Fig. 3), and Fig. 2 is an operation of the tandem type pneumatic booster. A sectional view showing an example, FIG. 3 is a sectional view taken along the - arrow direction of the tandem type pneumatic booster. 31...Front shell, 32...Rear shell, 33...Center plate, 34...Housing, 35...Front chamber, 36...Rear chamber, 37...Valve body, 39...Master cylinder, 40...Overhang part , 41...Front constant pressure chamber, 42...
Front part, 43... Recess, 45... Return spring, 48... Front variable pressure chamber, 51... Rear constant pressure chamber, 52... Rear variable pressure chamber, 76... Inner peripheral surface, 77
...Opening, 78...Groove, V...Switching valve.

Claims

[Claims for Utility Model Registration] The inside of the housing, which consists of a front shell and a rear shell, is divided into two by a center plate into a front chamber and a rear chamber, and each chamber is made into a front constant pressure chamber by a power piston equipped with a diaphragm and fixed to the valve body. A front constant pressure chamber, a rear constant pressure chamber and a rear variable pressure chamber are respectively defined, the front constant pressure chamber and the rear constant pressure chamber and the front variable pressure chamber and the rear variable pressure chamber are communicated with each other, and a negative pressure source is communicated with the front constant pressure chamber, An overhang part into which the rear part of the master cylinder is inserted is provided in the front shell to protrude into the front constant pressure chamber, and a recess into which the overhang part is inserted is formed in the front part of the valve body facing the front constant pressure chamber. In a tandem pneumatic booster equipped with a switching valve that selectively communicates with the atmosphere or the inside of the recess, an air passage consisting of a groove extending in the axial direction from the opening of the recess is provided on the inner peripheral surface of the recess of the valve body. A tandem type pneumatic booster characterized by the following: