JPS61199460U

JPS61199460U -

Info

Publication number: JPS61199460U
Application number: JP8450785U
Authority: JP
Priority date: 1985-06-04
Filing date: 1985-06-04
Publication date: 1986-12-13

Description

[Brief explanation of drawings]

第１図は本考案の一実施例を示す断面図、第２
図は第１図の液圧制御特性を示すグラフ図、第３
図は従来例の断面図である。１：ハウジング、４：入口室、５：出口室、６
：ポペツトバルブ、６ａ：ポペツト弁体、６ｂ：
弁座、９：前輪系統室、１０：段付ピストン、１
１：大径部、１２，１４：カツプシール、１３：
中径部、１５：小径部、１６：スプリング、１７
：摺動部材、１８：シール部材、２０：バツクア
ツプリング。 Fig. 1 is a sectional view showing one embodiment of the present invention;
The figure is a graph showing the hydraulic control characteristics of figure 1, and figure 3.
The figure is a sectional view of a conventional example. 1: Housing, 4: Inlet chamber, 5: Outlet chamber, 6
: Poppet valve, 6a: Poppet valve body, 6b:
Valve seat, 9: Front wheel system chamber, 10: Stepped piston, 1
1: Large diameter part, 12, 14: Cup seal, 13:
Medium diameter part, 15: Small diameter part, 16: Spring, 17
: Sliding member, 18: Seal member, 20: Backup spring.

Claims

[Claims for Utility Model Registration] A stepped piston that moves in response to receiving hydraulic pressure in an inlet chamber connected to a master cylinder of a rear wheel system and hydraulic pressure in an outlet chamber connected to a rear wheel cylinder from opposite directions. , a brake fluid pressure control having a poppet valve built into the stepped piston and opening/closing a passage communicating with the inlet chamber by movement of the stepped piston, and a spring pressing the stepped piston in a direction in which the poppet valve opens. In the valve, the stepped piston has a large diameter part that houses the poppet valve, and a medium diameter part that is a sliding part with a first sealing means arranged to separate the inlet chamber and the outlet chamber; a small diameter portion serving as a sliding portion for a second sealing means that separates the inlet chamber from the atmosphere side; and a small diameter portion serving as a sliding portion between the first sealing means and the outlet chamber;
A sliding member that holds the first sealing means and is slidably inserted into the middle diameter portion of the stepped piston is interposed, and the sliding member is connected to a front wheel system chamber connected to a master cylinder of the front wheel system. The brake receives hydraulic pressure from the direction of the outlet chamber, and is configured to move toward the front wheel system chamber and lock the large diameter portion of the stepped piston when the front wheel system fails. Hydraulic pressure control valve.