JPH0349163U

JPH0349163U -

Info

Publication number: JPH0349163U
Application number: JP11123989U
Authority: JP
Priority date: 1989-09-22
Filing date: 1989-09-22
Publication date: 1991-05-13
Also published as: JPH0437013Y2

Description

[Brief explanation of drawings]

第１図ないし第６図は本考案の第１実施例を示
すもので、第１図は負圧ブースタの縦断面図、第
２図は後部シエル半体及びダイヤフラムを外した
状態で示す負圧ブースタの中心部後面図、第３図
は負圧ブースタにおける弁筒単体の縦断面図（第
４図の−線断面図）、第４図及び第５図は第
３図の−線及び−線断面図、第６図は負
圧ブースタにおけるブースタプレート中心部の平
面図、第７図は本考案の第２実施例を示す戻しば
ね及びばね座板の分解斜視図である。Ｂ……負圧ブースタ、１……ブースタシエル、
２……ブースタプレート、３ｂ……内周ビード、
４……負圧室、５……作動室、６……弁筒、８…
…ばね座板、９……戻しばね、１０……後方延長
筒、１１……ブツシユ、１５……制御弁、１６…
…大気導入口、１７……入力杆、１８……ブレー
キペダル、２０……出力杆、２１……突起、２２
……前部フランジ、２３……後部フランジ、２４
……環状溝、２５……切欠、２６……小フランジ
、２７……切欠、２８……係止溝、２９……スト
ツパ壁、３０……ピン孔、３１……ロツクピン、
３２……バンド。 Figures 1 to 6 show a first embodiment of the present invention, in which Figure 1 is a longitudinal sectional view of the negative pressure booster, and Figure 2 is a negative pressure booster with the rear shell half and diaphragm removed. A rear view of the center of the booster, FIG. 3 is a longitudinal cross-sectional view of the valve cylinder alone in the negative pressure booster (a cross-sectional view taken along the - line in FIG. 4), and FIGS. 4 and 5 are a - line and - line in FIG. 3. 6 is a plan view of the central part of the booster plate in the negative pressure booster, and FIG. 7 is an exploded perspective view of a return spring and a spring seat plate showing a second embodiment of the present invention. B...Negative pressure booster, 1...Booster shell,
2... Booster plate, 3b... Inner peripheral bead,
4...Negative pressure chamber, 5...Working chamber, 6...Valve cylinder, 8...
... Spring seat plate, 9 ... Return spring, 10 ... Rear extension cylinder, 11 ... Bush, 15 ... Control valve, 16 ...
...Air inlet, 17...Input rod, 18...Brake pedal, 20...Output rod, 21...Protrusion, 22
...Front flange, 23...Rear flange, 24
... annular groove, 25 ... notch, 26 ... small flange, 27 ... notch, 28 ... locking groove, 29 ... stopper wall, 30 ... pin hole, 31 ... lock pin,
32...Band.

Claims

[Claims for Utility Model Registration] The booster plate 2 and diaphragm 3, which overlap each other and partition the inside of the booster shell 1 into a negative pressure chamber 4 at the front and an operating chamber 5 at the rear, are slid onto the rear wall of the booster shell 1. In a negative pressure booster in which a return spring 9 connected to a movably supported valve cylinder 6 and urging the valve cylinder 6 in the backward direction is accommodated in the negative pressure chamber 4, a pair of return springs 9 are provided on the outer periphery of the front end of the valve cylinder 6. front and rear flanges 22, 23, and a small flange 26 protruding from the bottom wall of the annular groove 24 between the flanges 22, 23, and a plurality of notches 25, 27 in the rear flange 23 and small flange 26. In addition to providing each
A plurality of locking grooves 28 are provided between the front flange 22 and the small flange 26, one end of which opens in each notch 27 of the small flange 26 and the other end of which is closed.
, the plurality of protrusions 21 protruding from the periphery of the center hole 2a of the booster plate 2 are inserted into all the notches 25.
, 27 to prevent at least one of the protrusions 21 from escaping from the locking groove 28.
is prevented from coming out by the return spring 9, and the annular groove 2
A negative pressure booster characterized in that an inner circumferential bead 3b of a diaphragm 3 is fitted into the inner peripheral bead 3b of the diaphragm 3.