JPS63189871U

JPS63189871U -

Info

Publication number: JPS63189871U
Application number: JP8088487U
Authority: JP
Priority date: 1987-05-29
Filing date: 1987-05-29
Publication date: 1988-12-06

Description

[Brief explanation of drawings]

第１図は本考案の代表的な実施例を示すタンデ
ム型のポートレスマスタシリンダの断面図、第２
図は本考案の他の実施例を示す部分拡大断面図、
第３図は従来例のロツキードタイプとポートレス
タイプのマスタシリンダにおけるペダルストロー
クに対する出力特性図、第４図は第３図のＡ部拡
大図、第５図は本考案における絞り孔径のペダル
速度に対するペダルストロークへの影響を示す特
性図である。図の主要部分の説明、１……シリンダボデー、
３……セカンダリピストン、７……第２圧力室、
９……第２補給室、１０……リザーバタンク、１
１……ストツパピン、１２……バルブロツド、１
３……弁体、１４……バルブスプリング、１５…
…リテーナ、１５′……絞り孔。 Fig. 1 is a sectional view of a tandem-type portless master cylinder showing a typical embodiment of the present invention;
The figure is a partially enlarged sectional view showing another embodiment of the present invention.
Fig. 3 is a diagram of the output characteristics with respect to the pedal stroke of the conventional master cylinder of the Rotsukido type and the portless type, Fig. 4 is an enlarged view of part A in Fig. 3, and Fig. 5 is the pedal of the throttle hole diameter of the present invention. FIG. 3 is a characteristic diagram showing the influence of speed on pedal stroke. Explanation of the main parts of the diagram, 1...Cylinder body,
3...Secondary piston, 7...Second pressure chamber,
9...Second supply room, 10...Reservoir tank, 1
1... Stopper pin, 12... Valve rod, 1
3... Valve body, 14... Valve spring, 15...
...Retainer, 15'...Aperture hole.

Claims

[Scope of utility model registration request]

A piston that is fluid-tightly and slidably inserted into an inner hole of a cylinder body and forms a pressure chamber in the inner hole of the cylinder body that is constantly connected to a hydraulic pressure line; a valve rod assembled to be slidable in a sliding direction; a valve body provided on the valve rod and in contact with and separated from a valve seat formed on the piston to control communication between the pressure chamber and the reservoir tank; In a portless type master cylinder equipped with a valve spring that biases the valve body toward the valve seat, the opening end of the large diameter part of the hole provided in the piston is closed, and the pressure inside the large diameter part and the pressure A master cylinder characterized in that chambers are communicated with each other by a communication passage having an area equivalent to a diameter of 0.8 mm or less.