JPH0426162U

JPH0426162U -

Info

Publication number: JPH0426162U
Application number: JP6759590U
Authority: JP
Priority date: 1990-06-26
Filing date: 1990-06-26
Publication date: 1992-03-02

Description

[Brief explanation of drawings]

第１図ないし第３図は本考案の一実施例を示す
ものであり、第１図は負圧ブースタの縦断側面図
、第２図は第１図の要部拡大図、第３図は第２図
の−線断面図、第４図は本考案の他の実施例
の第２図に対応した断面図である。１……ブースタシエル、２……ブースタピスト
ン、６……制御弁、１２……ピストンボス、１５
……入力杆、１５ａ……球状連結部、１６……弁
ピストン、３１……出力杆、４２……挿入穴、４
３……円筒部、４４……かしめ突部、４５，４６
……弾性部材、Ａ……負圧室、Ｂ……作動室、Ｐ
……操作部材としてのブレーキペダル。 Figures 1 to 3 show an embodiment of the present invention, in which Figure 1 is a longitudinal cross-sectional side view of a negative pressure booster, Figure 2 is an enlarged view of the main parts of Figure 1, and Figure 3 is an enlarged view of the main parts of Figure 1. FIG. 2 is a cross-sectional view taken along the - line in FIG. 2, and FIG. 4 is a cross-sectional view corresponding to FIG. 2 of another embodiment of the present invention. 1... Booster shell, 2... Booster piston, 6... Control valve, 12... Piston boss, 15
... Input rod, 15a ... Spherical connection part, 16 ... Valve piston, 31 ... Output rod, 42 ... Insertion hole, 4
3... Cylindrical part, 44... Caulking protrusion, 45, 46
...Elastic member, A...Negative pressure chamber, B...Working chamber, P
...Brake pedal as an operating member.

Claims

[Scope of utility model registration request]

A booster piston 2 whose front face faces a negative pressure chamber A that is constantly in communication with a negative pressure source and whose back face faces an operating chamber B is housed in the booster shell 1, and a piston boss provided at the center of the booster piston 2. An output rod 31 extending forward is connected to the front part of the valve piston 12, and a valve piston 16 for switching and operating a control valve 6 for switching the communication state of the working chamber B with the negative pressure chamber A and the atmosphere is connected to the piston boss. 12 and is provided at the front end of the input rod 15 connected to the operating member P.
A cylindrical portion 43 forming a bottomed insertion hole 42 into which the valve piston 5a is inserted is provided at the rear of the valve piston 16,
In the negative pressure booster, the cylindrical part 43 is provided with a caulking protrusion 44 that protrudes inward to engage with the rear part of the spherical connecting part 15a to prevent it from coming off.
A negative pressure booster characterized in that elastic members 45 and 46 are interposed between the caulking projection 44 and the spherical connecting portion 15a.