JPS6159155U

JPS6159155U -

Info

Publication number: JPS6159155U
Application number: JP14559084U
Authority: JP
Priority date: 1984-09-25
Filing date: 1984-09-25
Publication date: 1986-04-21

Description

[Brief explanation of drawings]

第１図は本考案の一実施例の縦断面図、第２図
は第１図中の弁装置３４の断面拡大図、第３図は
従来装置の断面図である。符号の説明、１０…マスタシリンダボデー、１
０ｄ，１０ｅ……リザーバ接続口、１１……段付
ピストン、１２……遊動ピストン、１５，１６…
…カツプシール、１７……大径環状圧力室、１８
……第１小径圧力室、２０……第２小径圧力室、
２１，２２……カツプシール、３４……弁装置、
３６……プレート、３７……シート、３８……ハ
ウジング、３８ａ……一方向弁体、３８ｂ……突
起、４０……キヤツプ、４０ｃ……突起、４１…
…第１スプリング、４２……弁室、４３……第２
スプリング、４４……液放出孔、４５……リリー
フ弁体、４７……窓、５１……スロツト。 FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, FIG. 2 is an enlarged sectional view of the valve device 34 in FIG. 1, and FIG. 3 is a sectional view of a conventional device. Explanation of symbols, 10... Master cylinder body, 1
0d, 10e... Reservoir connection port, 11... Stepped piston, 12... Idle piston, 15, 16...
...Cup seal, 17...Large diameter annular pressure chamber, 18
...first small diameter pressure chamber, 20...second small diameter pressure chamber,
21, 22...Cup seal, 34...Valve device,
36...Plate, 37...Seat, 38...Housing, 38a...One-way valve body, 38b...Protrusion, 40...Cap, 40c...Protrusion, 41...
...first spring, 42...valve chamber, 43...second
Spring, 44...liquid discharge hole, 45...relief valve body, 47...window, 51...slot.

Claims

[Scope of utility model registration request]

A small-diameter pressure chamber and a large-diameter annular pressure chamber whose pressure increases due to the operation of the stepped piston, and when the pressure increase in the large-diameter annular pressure chamber reaches a relatively low predetermined pressure, liquid is released from the large-diameter annular pressure chamber to the reservoir. a relief valve mechanism that opens a passage, and a one-way valve mechanism that opens a liquid suction passage from the reservoir to the large-diameter annular pressure chamber in response to negative pressure in the large-diameter annular pressure chamber; In a master cylinder configured such that when the large-diameter annular pressure chamber is operated, the pressure fluid in the large-diameter annular pressure chamber is force-fed to the small-diameter pressure chamber through the outer circumferential side of a cup seal attached to the stepped piston, and is discharged together with the pressure fluid in the small-diameter pressure chamber, The valve device includes a plate that is fitted and fixed into the reservoir connection port of the master cylinder body and has a vertical passage hole in the center thereof, an elastic sheet fixed to the lower side of the plate, and a hollow rigid housing integrally having a seated one-way valve body in the form of a brim and extending upwardly within the through hole to form a liquid suction passage between the housing; A fitted rigid cap, a first compression spring that urges the housing and the cap upward to seat the one-way valve body on the seat, and is disposed within a valve chamber formed by the housing and the cap. and a relief valve element that is biased downward by a second compression spring interposed between the housing and the cap to close a liquid discharge hole formed in the housing, and the housing and the cap are fitted into each other. protrusions are formed on the outer periphery of each of the joints to be spaced apart in the vertical direction, and a slot is formed in the inner member for passing the protrusion of the outer member,
. A valve device for a master cylinder, in which an upper end turn portion of the first spring is fitted between these protrusions.