초록 ▼

An electromagnetically operated valve which attains an automatic establishment of a reduced flow cross section that is effective after a closing position of the valve. The valve has a magnet armature, longitudinally movable in a valve dome, with a valve tappet for actuation of a seat valve. The seat

An electromagnetically operated valve which attains an automatic establishment of a reduced flow cross section that is effective after a closing position of the valve. The valve has a magnet armature, longitudinally movable in a valve dome, with a valve tappet for actuation of a seat valve. The seat valve is located in a valve chamber from which pressure fluid conduits, leads to upper and lower face ends of the circumferentially sealed off magnet armature. When the valve is opening from the closing position, an additional force acting in the closing direction upon the magnet armature is generated because of the shaping of the seat valve, and as a result of this additional force the seat valve assumes a partly closed position that is different from its position of repose. The valve is applicable particularly to traction-controlled hydraulic brake systems of motor vehicles.

대표청구항 ▼

[ What is claimed and desired to be secured by Letters Patent of the United States is:] [9.] A method for switching an electromagnetically actuated valve (14) in a slip-controlled hydraulic brake system (10) of a motor vehicle which comprises disposing the valve between a master cylinder (11) and a

[ What is claimed and desired to be secured by Letters Patent of the United States is:] [9.] A method for switching an electromagnetically actuated valve (14) in a slip-controlled hydraulic brake system (10) of a motor vehicle which comprises disposing the valve between a master cylinder (11) and a wheel brake cylinder (13) in a brake line (12), and upon slip control for brake pressure reduction in the wheel brake cylinder (13) moving the valve into a closing position by applying current to a magnet coil (29) which applies a magnetic force on an armature, while in the currentless state, the valve can be moved into its open position for brake pressure buildup, moving the valve (14) out of its closing position into a further-reduced, partly closed position by applying a modified, movable current to a magnet coil (29) with a current of low constant height or with a medium-frequency or high-frequency pulsed current that is lower than a current for closing the valve (14), and simultaneously applying a hydraulic force onto the armature, whereby the magnetic force and the hydraulic force act counter to a spring force of a restoring spring (44).