JPH0478068U

JPH0478068U -

Info

Publication number: JPH0478068U
Application number: JP12207290U
Authority: JP
Priority date: 1990-11-20
Filing date: 1990-11-20
Publication date: 1992-07-08

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例を示す全体構成図、
第２図は第１図の装置によつて得られる特性線図
、第３図は要部断面図である。１１……マスタシリンダ、１３……バキユーム
ブースタ、１４……圧力源、１９……フロントホ
イールシリンダ（スレーブシリンダ）、２５……
増圧ピストン、２６……圧力室、２７……圧力室
、２８……低圧側ポート、２９……高圧側ポート
、４９……プランジヤ、５０……フランジ、５１
〜５５……ポート、５６……パキユームモータ、
Ａ……増圧器、Ｂ……切換弁。 FIG. 1 is an overall configuration diagram showing an embodiment of the present invention;
FIG. 2 is a characteristic diagram obtained by the apparatus shown in FIG. 1, and FIG. 3 is a sectional view of the main part. 11... Master cylinder, 13... Vacuum booster, 14... Pressure source, 19... Front wheel cylinder (slave cylinder), 25...
Pressure booster piston, 26...pressure chamber, 27...pressure chamber, 28...low pressure side port, 29...high pressure side port, 49...plunger, 50...flange, 51
~55...Port, 56...Paquium motor,
A...Pressure booster, B...Switching valve.

Claims

[Scope of utility model registration request]

In an operating force assisting device that uses a booster to assist an operating force to a master cylinder that supplies fluid pressure to a slave cylinder, a pressure increasing piston is provided between the master cylinder and the slave cylinder, and the pressure increasing piston is a pressure intensifier comprising a low pressure side port and a high pressure side port communicating with respective pressure chambers formed on both sides, the low pressure side port and the high pressure side port of the pressure intensifier, and the pressure intensifier being connected to the master cylinder and the slave cylinder, respectively; When the pressure of a pressure source that supplies pressure to the booster is equal to or higher than a set value, the master cylinder and the slave cylinder are communicated with each other, and the low pressure side port and the high pressure side port are shut off from them. a switching valve that is held in a position that communicates the master cylinder with the low-pressure side port and communicates the slave cylinder with the high-pressure side port when the pressure of the pressure source is less than a set value; , the switching valve is provided with a plunger that slides by master cylinder pressure, the switching valve is provided with a flange having an inclined surface that comes into contact only when the plunger is extended, and depending on the degree of pressure drop or failure of the pressure source, , when the switching valve shuts off the low-pressure side port and the high-pressure side port and the master cylinder pressure is no longer transmitted to the slave cylinder, the switching valve causes the plunger to move to the sloped surface of the flange due to the master cylinder pressure. An operating force assisting device characterized by comprising a mechanism that moves a piston in a switching valve by pressing , thereby eliminating the blocking of the low pressure side port and the high pressure side port.