JPH0296350U

JPH0296350U -

Info

Publication number: JPH0296350U
Application number: JP554889U
Authority: JP
Priority date: 1989-01-19
Filing date: 1989-01-19
Publication date: 1990-08-01
Anticipated expiration: 2004-01-19
Also published as: JP2512768Y2

Description

[Brief explanation of drawings]

第１図は本考案による負圧倍力装置をタンデム
型のブレーキ倍力装置に適用した一実施例のパワ
ーピストン取付部の拡大詳細図、第２図は本考案
の他の実施例を示す第１図と同様の拡大詳細図、
第３図は従来の負圧によるタンデム型ブレーキ倍
力装置の断面図、第４図は第３図のＡ部の拡大詳
細図である。１……ブレーキ倍力装置（負圧倍力装置）、５
ａ，６ａ……第１、第２定圧室、５ｂ，６ｂ……
第１、第２変圧室、７……バルブボデイ、８，９
……パワーピストン部材（パワーピストン）、１
０，１１……ダイヤフラム（パワーピストン）、
２０′，２０″……リテーナ。 Fig. 1 is an enlarged detailed view of the power piston mounting part of one embodiment in which the negative pressure booster according to the present invention is applied to a tandem type brake booster, and Fig. 2 is an enlarged detailed view showing another embodiment of the present invention. Enlarged detailed view similar to Figure 1,
FIG. 3 is a sectional view of a conventional tandem brake booster using negative pressure, and FIG. 4 is an enlarged detailed view of section A in FIG. 3. 1... Brake booster (negative pressure booster), 5
a, 6a...first and second constant pressure chambers, 5b, 6b...
1st and 2nd pressure change chambers, 7... Valve body, 8, 9
...Power piston member (power piston), 1
0,11...Diaphragm (power piston),
20', 20''...retainer.

Claims

[Claims for Utility Model Registration] A valve body that is arranged to be movable forward and backward in a space formed by a front shell and a rear shell and that penetrates the rear shell in an airtight and slidable manner, and a retainer attached to this valve body. a power piston that is fixed by the valve body and partitions the space into a constant pressure chamber into which negative pressure is introduced and a variable pressure chamber into which air at atmospheric pressure is introduced during operation; a negative pressure doubler, the control valve being provided in the valve body and actuated by the input shaft to switch and control the variable pressure chamber to selectively communicate with the atmosphere or the constant pressure chamber. In the power device, the retainer has an inner circumferential end that is bent to the side opposite to the power piston pressing surface and that engages the valve body, and when the retainer is attached to the valve body, the inner circumferential end A negative pressure booster characterized in that at least a portion of a surface continuous with the power piston pressing surface of the valve body is shaped so as to abut against the outer peripheral surface of the valve body.