JPS60168662U

JPS60168662U - master cylinder

Info

Publication number: JPS60168662U
Application number: JP5709184U
Authority: JP
Inventors: 寺田　滋
Original assignee: トヨタ自動車株式会社
Priority date: 1984-04-18
Filing date: 1984-04-18
Publication date: 1985-11-08

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例である液圧ブレーキ装置用マ
スクシリンダの正面断面図である。第２図は第１図のマ
スクシリンダの別の作動状態を示す断面図である。第３
図は第１図のマスクシリンダから作動液を供給されたホ
イールシリンダの作動ストロークと所要液圧との関係を
示すグラフである。FIG. 1 is a front sectional view of a mask cylinder for a hydraulic brake device, which is an embodiment of the present invention. FIG. 2 is a sectional view showing another operating state of the mask cylinder of FIG. 1. Third
The figure is a graph showing the relationship between the operating stroke of the wheel cylinder supplied with hydraulic fluid from the mask cylinder of FIG. 1 and the required hydraulic pressure.

Claims

[Scope of Claim for Utility Model Registration] A mask cylinder that pressurizes and supplies hydraulic fluid to a hydraulic actuator, which has a stepped through hole including a small diameter hole and a large diameter hole, and a reservoir with the large diameter hole. A stepped cylinder comprising a supply port that communicates with the tank, and a compensating port that communicates the large diameter hole with the reservoir tank at a position a certain distance closer to the small diameter hole from the supply port; a small-diameter piston liquid-tightly and slidably fitted into the small-diameter hole of the cylinder; a first stopper that prevents the small-diameter piston from coming off from the open end of the small-diameter hole; is movably fitted together with the stepped cylinder and the small-diameter piston to form a pressurizing chamber spanning the small-diameter hole and the large-diameter hole, and is partitioned from the pressurizing chamber by the first cup seal. On the other hand, a large-diameter piston that together with a stepped cylinder forms a liquid chamber that is always in communication with the supply boat; a second stopper that prevents movement toward the open end of the large diameter hole from a position located between; and a second stopper that is fixedly provided to the large diameter piston, and the large diameter piston contacts the second stopper. When the large-diameter piston moves a certain distance away from the second stopper, it fits into the small-diameter hole and separates the pressurizing chamber between the small-diameter hole side and the large-diameter hole side. a second cup seal that partitions the small-diameter piston and the large-diameter piston into two parts; a first biasing means that biases the small-diameter piston and the large-diameter piston in a direction in which the small-diameter piston and the stepped cylinder are separated from each other; When the second cup seal is biased in a direction to separate from the open end of the hole, and the biasing force is applied to the small-diameter piston and the large-diameter piston in a direction that causes them to approach each other, the second cup seal closes in the small-diameter hole. Although relative movement between the small-diameter piston and the stepped cylinder based on the hydraulic pressure generated in the pressurizing chamber before the second cup seal is fitted into the second cup seal is prevented, the liquid pressure in the pressurizing chamber is predetermined after the second cup seal is fitted. a second biasing means whose size is set to allow relative movement between the two when a certain value is exceeded; A mask cylinder including a hydraulic pressure outlet port communicating with the portion of the mask cylinder.