초록 ▼

The present invention relates to a dual-circuit hydraulic brake system with slip control, in particular for automotive vehicles, wherein wheel brakes (26, 27, 41, 42) are connected via electromagnetically actuatable multiple-position valves (38, 39, 88, 40, 24, 89) to brake circuits which are hydrau

The present invention relates to a dual-circuit hydraulic brake system with slip control, in particular for automotive vehicles, wherein wheel brakes (26, 27, 41, 42) are connected via electromagnetically actuatable multiple-position valves (38, 39, 88, 40, 24, 89) to brake circuits which are hydraulically isolated from one another, wherein the brake circuits are adapted to be pressurized by a tandem master cylinder (1), on the one hand, and are connectible to a dual-circuit pump aggregate (76, 77) adapted to be driven electromotively, on the other hand. Both outlets of the pump aggregate (76, 77) are connected to normally closed brake valves (43, 44) which are governed by the master cylinder pressure and separating valves (11, 12) which are adapted to be closed by the outlet pressure of the brake valves (43, 44) are inserted into the connections between the tandem master cylinder (1) and the wheel brakes (26, 27, 41, 42).

대표청구항 ▼

A multi-circuit slip controlled hydraulic brake system for a vehicle comprising: a plurality of wheel brakes connected to hydraulically isolated hydraulic brake circuits, said connections controlled by electromagnetically actuatable multiple-position valves; a tandem master cylinder adapted to press

A multi-circuit slip controlled hydraulic brake system for a vehicle comprising: a plurality of wheel brakes connected to hydraulically isolated hydraulic brake circuits, said connections controlled by electromagnetically actuatable multiple-position valves; a tandem master cylinder adapted to pressurize said hydraulic brake circuits; a pluraliy of brake valves and an electromotively driven pump aggregate having at least one pump outlet, each said brake valve connected to a pump outlet, said brake valves controlled by master cylinder pressure; a plurality of separating valves incorporated hydraulically between said master cylinder and said wheel brakes, each said separating valve controlled by said brake valves wherein a predetermined level of master cylinder pressure opens said brake valves wherein pump aggregate pressure closes said separating valves, whereby said pump aggregate pressurizes said hydraulic brake circuits; wherein said brake valves include a first and a second piston, each said piston having a first end and a second end, each said piston reciprocable coaxially, wherein said second piston is provided with an axial throughgoing bore, said second piston sealingly slideable into a chamber, the first end of said second piston forming a valve closure member shaped to abut a valve seat, said second piston biased so said first end of said second piston abuts said valve seat thereby sealing an annular chamber hydraulically connected to a pump outlet, and wherein said first piston is biased in the same direction as said second piston and controlled by master cylinder pressure such that a selected level of master cylinder pressure displaces said first piston whereby said second end of said first piston is abutted against said first end of said second piston sealing said axial bore in said second piston, and such that a selected increased level of master cylinder pressure displaces both said first and said second pistons displacing said first end of said second piston from said valve seat unsealing said annular chamber; and, wherein a chamber is provided by said first and second pistons in their said biased positions, said chamber being hydraulically connected with a closure piston of one of said separating valves.