JPS6158162U

JPS6158162U -

Info

Publication number: JPS6158162U
Application number: JP14386984U
Authority: JP
Priority date: 1984-09-24
Filing date: 1984-09-24
Publication date: 1986-04-18

Description

[Brief explanation of the drawing]

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、
１０ｄ，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、１
８……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……
第１ハウジング、３８ａ……一方向弁体、４０…
…第１ハウジング、４０ｃ……突起、４１……ス
プリング、４２……弁室、４３……スプリング、
４４……液放出孔、４５……リリーフ弁体、４７
……窓。 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,
10d, 10e... Reservoir connection port, 11... Stepped piston, 12... Idle piston, 15, 16
...Cup seal, 17...Large diameter annular pressure chamber, 1
8...First small diameter pressure chamber, 20...Second small diameter pressure chamber, 21, 22...Cup seal, 34...Valve device, 36...Plate, 37...Seat, 38...
First housing, 38a... One-way valve body, 40...
...First housing, 40c...Protrusion, 41...Spring, 42...Valve chamber, 43...Spring,
44...Liquid discharge hole, 45...Relief valve body, 47
……window.

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 first housing integrally having a seated annular one-way valve body and extending upwardly within the through hole to form a liquid suction passage between the first housing; a fitted second housing; a first compression spring that urges both housings upward to seat the one-way valve element on the seat; Second
a relief valve body that is urged downward by a second compression spring interposed between the first housing and the first housing to close a liquid discharge hole formed in the first housing; Connection is made between the upper surface of a plurality of protrusions protruding from the peripheral surface of one side of the fitting portion and the upper wall surface of a plurality of windows provided on the other side, and the liquid in the valve chamber flows through the hole. the master cylinder valve gear through which flow is allowed to flow to the reservoir.