JPS6259563U

JPS6259563U -

Info

Publication number: JPS6259563U
Application number: JP15142985U
Authority: JP
Priority date: 1985-10-01
Filing date: 1985-10-01
Publication date: 1987-04-13

Description

[Brief explanation of the drawing]

第１図は本考案による制動液圧制御装置の一実
施例を示す全体断面図、第２図は保持手段の他の
実施例による制動液圧制御装置の全体断面図であ
る。１……ハウジング、１ａ……油通孔、２……ス
プール弁、３……フリーピストン、３ａ，３ｂ，
３ｃ……油通孔、３ｄ……弁体収納室、４……ポ
ペツト弁（弁体）、５……バルブシート、７……
スプリング（第１バネ部材）、８……スプリング
（第２バネ部材）、９，１１……リテーナ（保持
手段）、１０，１２……リテーナ案内部材（保持
手段）、１０ａ，１２ａ……係止爪、Ｐｉ……入
力ポート、Ｐｏ……出力ポート、Ｐｐ……パイロ
ツト液圧室。 FIG. 1 is an overall sectional view showing one embodiment of a brake hydraulic pressure control device according to the present invention, and FIG. 2 is an overall sectional view of a brake hydraulic pressure control device using another embodiment of the holding means. 1...Housing, 1a...Oil hole, 2...Spool valve, 3...Free piston, 3a, 3b,
3c...Oil hole, 3d...Valve body storage chamber, 4...Poppet valve (valve body), 5...Valve seat, 7...
Spring (first spring member), 8... Spring (second spring member), 9, 11... Retainer (holding means), 10, 12... Retainer guide member (holding means), 10a, 12a... Locking Claw, Pi...input port, Po...output port, Pp...pilot hydraulic pressure chamber.

Claims

[Scope of utility model registration request]

A brake fluid pressure control device having a brake system divided into two systems, one for the front wheels and the other for the rear wheels, comprising an input port communicating with the rear wheel brake system in a master cylinder and an output port communicating with the rear wheel cylinder on the rear wheel side. a housing having a pilot hydraulic pressure chamber that communicates with the front wheel brake system in the master cylinder; a spool valve formed larger than a pressure-receiving cross-sectional area of the other end corresponding to the pilot hydraulic pressure chamber; A free piston having an oil hole that communicates the input port and the output port, and a hydraulic pressure difference caused by a difference in pressure receiving cross-sectional areas at both ends of the spool valve, which is interposed between the spool valve and the free piston. a first spring member that presses the spool valve toward the input port side against the spool valve, a valve body that opens and closes the oil passage hole in conjunction with movement of the spool valve, and the pilot hydraulic pressure chamber. a second spring member provided inside the pilot hydraulic pressure chamber for urging the free piston toward the input port; and a holding means for holding the second spring member at a predetermined position inside the pilot hydraulic pressure chamber. When the front wheel brake system is normal, as the hydraulic pressure from the input port increases, the spool valve moves toward the pilot hydraulic pressure chamber against the elastic force of the first spring member. In the event of a failure of the brake system, due to a decrease in the hydraulic pressure in the pilot hydraulic pressure chamber, the valve body will move in conjunction with the integral movement of the spool valve and the free piston toward the pilot hydraulic pressure chamber. A brake hydraulic pressure control device characterized in that the oil passage hole is opened.