JPH0198768U

JPH0198768U -

Info

Publication number: JPH0198768U
Application number: JP19508487U
Authority: JP
Priority date: 1987-12-23
Filing date: 1987-12-23
Publication date: 1989-07-03
Also published as: JPH0355477Y2

Description

[Brief explanation of the drawing]

図面は本考案の一実施例を示し、第１図はマス
タシリンダの縦断側面図、第１Ａ図は第１図の部
分拡大図、第２図は第１図―線拡大断面図、
第３図は第２図―線断面図である。Ｍ……シリンダ本体、Ｒ……油槽、１……シリ
ンダ孔、１ａ……小径部、１ｂ……大径部、２_１，２_２……前、後部ピストン、２ａ……小径ピス
トン部、２ｂ……大径ピストン部、３_２……後部
油圧室、６_２……後部補給油室、２１_２……リリ
ーフポート、２２_２……サプライポート、２３…
…通油路、２５……弁室、２７……弁装置、２８
……一方向弁、２９……圧力応動弁、３０……バ
イパス、５０……連通路、５２……開閉弁。 The drawings show an embodiment of the present invention, in which FIG. 1 is a vertical sectional side view of a master cylinder, FIG. 1A is a partially enlarged view of FIG. 1, and FIG.
FIG. 3 is a sectional view taken along the line of FIG. 2. M...Cylinder body, R...Oil tank, 1...Cylinder hole, 1a...Small diameter part, 1b...Large diameter part, 2 ₁ , 2 ₂ ... front and rear pistons, 2a ... small diameter piston section, 2b ... large diameter piston section, 3 ₂ ... rear hydraulic chamber, 6 ₂ ... rear supply oil chamber, 21 ₂ ... relief port, 22 ₂ ...Supply port, 23...
... Oil passage, 25 ... Valve chamber, 27 ... Valve device, 28
... One-way valve, 29 ... Pressure-responsive valve, 30 ... Bypass, 50 ... Communication passage, 52 ... Opening/closing valve.

Claims

[Scope of utility model registration request]

The cylinder body is provided with a stepped cylinder hole consisting of a small diameter part at the front and a large diameter part at the rear, a front piston is slidably fitted into the small diameter part, and a stepped cylinder hole is fitted into the small diameter part and the large diameter part. A rear piston having a correspondingly small-diameter piston portion and a large-diameter piston portion is slidably fitted into a hydraulic chamber formed between the front piston and the small-diameter piston portion at a predetermined retracted position of the rear piston. A relief port that opens and a supply port that opens to a replenishment oil chamber formed between the small-diameter piston portion and the large-diameter piston portion are communicated with the oil tank via an oil passage provided with a valve device. The device includes a pressure-responsive valve that opens when the pressure in the replenishment oil chamber rises to a predetermined value or more, a one-way valve that allows hydraulic oil to flow only in one direction from the oil tank to the replenishment oil chamber, and the In a quick-filling master cylinder equipped with a pressure-responsive valve and a bypass with high flow resistance that communicates between the oil tank and the relief port by bypassing the one-way valve, the valve device is provided in the cylinder body. A quick-filling type master cylinder, comprising: a communication path that connects the replenishment oil chamber to the oil tank in a detour manner; and an on-off valve that opens and closes the communication path.